1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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. */
33 #include "tree-inline.h"
48 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
50 { NORMAL, /* Ordinary declaration */
51 FUNCDEF, /* Function definition */
52 PARM, /* Declaration of parm before function body */
53 FIELD, /* Declaration inside struct or union */
54 BITFIELD, /* Likewise but with specified width */
55 TYPENAME}; /* Typename (inside cast or sizeof) */
58 /* Nonzero if we have seen an invalid cross reference
59 to a struct, union, or enum, but not yet printed the message. */
61 tree pending_invalid_xref;
62 /* File and line to appear in the eventual error message. */
63 const char *pending_invalid_xref_file;
64 int pending_invalid_xref_line;
66 /* While defining an enum type, this is 1 plus the last enumerator
67 constant value. Note that will do not have to save this or `enum_overflow'
68 around nested function definition since such a definition could only
69 occur in an enum value expression and we don't use these variables in
72 static tree enum_next_value;
74 /* Nonzero means that there was overflow computing enum_next_value. */
76 static int enum_overflow;
78 /* Parsing a function declarator leaves a list of parameter names
79 or a chain or parameter decls here. */
81 static tree last_function_parms;
83 /* Parsing a function declarator leaves here a chain of structure
84 and enum types declared in the parmlist. */
86 static tree last_function_parm_tags;
88 /* After parsing the declarator that starts a function definition,
89 `start_function' puts here the list of parameter names or chain of decls.
90 `store_parm_decls' finds it here. */
92 static tree current_function_parms;
94 /* Similar, for last_function_parm_tags. */
95 static tree current_function_parm_tags;
97 /* Similar, for the file and line that the prototype came from if this is
98 an old-style definition. */
99 static const char *current_function_prototype_file;
100 static int current_function_prototype_line;
102 /* The current statement tree. */
104 static struct stmt_tree_s c_stmt_tree;
106 /* The current scope statement stack. */
108 static tree c_scope_stmt_stack;
110 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
111 that have names. Here so we can clear out their names' definitions
112 at the end of the function. */
114 static tree named_labels;
116 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
118 static tree shadowed_labels;
120 /* Nonzero when store_parm_decls is called indicates a varargs function.
121 Value not meaningful after store_parm_decls. */
123 static int c_function_varargs;
125 /* Set to 0 at beginning of a function definition, set to 1 if
126 a return statement that specifies a return value is seen. */
128 int current_function_returns_value;
130 /* Set to 0 at beginning of a function definition, set to 1 if
131 a return statement with no argument is seen. */
133 int current_function_returns_null;
135 /* Set to nonzero by `grokdeclarator' for a function
136 whose return type is defaulted, if warnings for this are desired. */
138 static int warn_about_return_type;
140 /* Nonzero when starting a function declared `extern inline'. */
142 static int current_extern_inline;
144 /* For each binding contour we allocate a binding_level structure
145 * which records the names defined in that contour.
148 * 1) one for each function definition,
149 * where internal declarations of the parameters appear.
150 * 2) one for each compound statement,
151 * to record its declarations.
153 * The current meaning of a name can be found by searching the levels from
154 * the current one out to the global one.
157 /* Note that the information in the `names' component of the global contour
158 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
162 /* A chain of _DECL nodes for all variables, constants, functions,
163 and typedef types. These are in the reverse of the order supplied.
167 /* A list of structure, union and enum definitions,
168 * for looking up tag names.
169 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
170 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
171 * or ENUMERAL_TYPE node.
175 /* For each level, a list of shadowed outer-level local definitions
176 to be restored when this level is popped.
177 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
178 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
181 /* For each level (except not the global one),
182 a chain of BLOCK nodes for all the levels
183 that were entered and exited one level down. */
186 /* The BLOCK node for this level, if one has been preallocated.
187 If 0, the BLOCK is allocated (if needed) when the level is popped. */
190 /* The binding level which this one is contained in (inherits from). */
191 struct binding_level *level_chain;
193 /* Nonzero for the level that holds the parameters of a function. */
196 /* Nonzero if this level "doesn't exist" for tags. */
197 char tag_transparent;
199 /* Nonzero if sublevels of this level "don't exist" for tags.
200 This is set in the parm level of a function definition
201 while reading the function body, so that the outermost block
202 of the function body will be tag-transparent. */
203 char subblocks_tag_transparent;
205 /* Nonzero means make a BLOCK for this level regardless of all else. */
208 /* Nonzero means make a BLOCK if this level has any subblocks. */
209 char keep_if_subblocks;
211 /* Number of decls in `names' that have incomplete
212 structure or union types. */
215 /* A list of decls giving the (reversed) specified order of parms,
216 not including any forward-decls in the parmlist.
217 This is so we can put the parms in proper order for assign_parms. */
221 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
223 /* The binding level currently in effect. */
225 static struct binding_level *current_binding_level;
227 /* A chain of binding_level structures awaiting reuse. */
229 static struct binding_level *free_binding_level;
231 /* The outermost binding level, for names of file scope.
232 This is created when the compiler is started and exists
233 through the entire run. */
235 static struct binding_level *global_binding_level;
237 /* Binding level structures are initialized by copying this one. */
239 static struct binding_level clear_binding_level
240 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
243 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
245 static int keep_next_level_flag;
247 /* Nonzero means make a BLOCK for the next level pushed
248 if it has subblocks. */
250 static int keep_next_if_subblocks;
252 /* The chain of outer levels of label scopes.
253 This uses the same data structure used for binding levels,
254 but it works differently: each link in the chain records
255 saved values of named_labels and shadowed_labels for
256 a label binding level outside the current one. */
258 static struct binding_level *label_level_chain;
260 /* Functions called automatically at the beginning and end of execution. */
262 tree static_ctors, static_dtors;
264 /* Forward declarations. */
266 static struct binding_level * make_binding_level PARAMS ((void));
267 static void mark_binding_level PARAMS ((void *));
268 static void clear_limbo_values PARAMS ((tree));
269 static int duplicate_decls PARAMS ((tree, tree, int));
270 static int redeclaration_error_message PARAMS ((tree, tree));
271 static void storedecls PARAMS ((tree));
272 static void storetags PARAMS ((tree));
273 static tree lookup_tag PARAMS ((enum tree_code, tree,
274 struct binding_level *, int));
275 static tree lookup_tag_reverse PARAMS ((tree));
276 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
278 static tree grokparms PARAMS ((tree, int));
279 static void layout_array_type PARAMS ((tree));
280 static tree c_make_fname_decl PARAMS ((tree, int));
281 static void c_expand_body PARAMS ((tree, int));
283 /* C-specific option variables. */
285 /* Nonzero means allow type mismatches in conditional expressions;
286 just make their values `void'. */
288 int flag_cond_mismatch;
290 /* Nonzero means don't recognize the keyword `asm'. */
294 /* Nonzero means do some things the same way PCC does. */
296 int flag_traditional;
298 /* Nonzero means enable C89 Amendment 1 features. */
302 /* Nonzero means use the ISO C99 dialect of C. */
306 /* Nonzero means that we have builtin functions, and main is an int */
310 /* Nonzero means add default format_arg attributes for functions not
313 int flag_noniso_default_format_attributes = 1;
315 /* Nonzero means to allow single precision math even if we're generally
316 being traditional. */
317 int flag_allow_single_precision = 0;
319 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
321 int flag_signed_bitfields = 1;
322 int explicit_flag_signed_bitfields = 0;
324 /* Nonzero means warn about use of implicit int. */
326 int warn_implicit_int;
328 /* Nonzero means warn about usage of long long when `-pedantic'. */
330 int warn_long_long = 1;
332 /* Nonzero means message about use of implicit function declarations;
333 1 means warning; 2 means error. */
335 int mesg_implicit_function_declaration = -1;
337 /* Nonzero means give string constants the type `const char *'
338 to get extra warnings from them. These warnings will be too numerous
339 to be useful, except in thoroughly ANSIfied programs. */
341 int flag_const_strings;
343 /* Nonzero means warn about pointer casts that can drop a type qualifier
344 from the pointer target type. */
348 /* Nonzero means warn when casting a function call to a type that does
349 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
350 when there is no previous declaration of sqrt or malloc. */
352 int warn_bad_function_cast;
354 /* Warn about functions which might be candidates for format attributes. */
356 int warn_missing_format_attribute;
358 /* Warn about traditional constructs whose meanings changed in ANSI C. */
360 int warn_traditional;
362 /* Nonzero means warn about sizeof(function) or addition/subtraction
363 of function pointers. */
365 int warn_pointer_arith;
367 /* Nonzero means warn for non-prototype function decls
368 or non-prototyped defs without previous prototype. */
370 int warn_strict_prototypes;
372 /* Nonzero means warn for any global function def
373 without separate previous prototype decl. */
375 int warn_missing_prototypes;
377 /* Nonzero means warn for any global function def
378 without separate previous decl. */
380 int warn_missing_declarations;
382 /* Nonzero means warn about multiple (redundant) decls for the same single
383 variable or function. */
385 int warn_redundant_decls = 0;
387 /* Nonzero means warn about extern declarations of objects not at
388 file-scope level and about *all* declarations of functions (whether
389 extern or static) not at file-scope level. Note that we exclude
390 implicit function declarations. To get warnings about those, use
393 int warn_nested_externs = 0;
395 /* Warn about a subscript that has type char. */
397 int warn_char_subscripts = 0;
399 /* Warn if a type conversion is done that might have confusing results. */
403 /* Warn if adding () is suggested. */
405 int warn_parentheses;
407 /* Warn if initializer is not completely bracketed. */
409 int warn_missing_braces;
411 /* Warn if main is suspicious. */
415 /* Warn about #pragma directives that are not recognised. */
417 int warn_unknown_pragmas = 0; /* Tri state variable. */
419 /* Warn about comparison of signed and unsigned values.
420 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
422 int warn_sign_compare = -1;
424 /* Warn about testing equality of floating point numbers. */
426 int warn_float_equal = 0;
428 /* Nonzero means warn about use of multicharacter literals. */
430 int warn_multichar = 1;
432 /* The variant of the C language being processed. */
434 c_language_kind c_language = clk_c;
436 /* Nonzero means `$' can be in an identifier. */
438 #ifndef DOLLARS_IN_IDENTIFIERS
439 #define DOLLARS_IN_IDENTIFIERS 1
441 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
443 /* Decode the string P as a language-specific option for C.
444 Return the number of strings consumed. Should not complain
445 if it does not recognise the option. */
448 c_decode_option (argc, argv)
449 int argc ATTRIBUTE_UNUSED;
452 int strings_processed;
455 strings_processed = cpp_handle_option (parse_in, argc, argv);
457 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
459 flag_traditional = 1;
460 flag_writable_strings = 1;
462 else if (!strcmp (p, "-fallow-single-precision"))
463 flag_allow_single_precision = 1;
464 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
469 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
473 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
477 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
479 flag_traditional = 0;
480 flag_writable_strings = 0;
482 else if (!strncmp (p, "-std=", 5))
484 /* Select the appropriate language standard. We currently
486 -std=iso9899:1990 same as -ansi
487 -std=iso9899:199409 ISO C as modified in amend. 1
488 -std=iso9899:1999 ISO C 99
489 -std=c89 same as -std=iso9899:1990
490 -std=c99 same as -std=iso9899:1999
491 -std=gnu89 default, iso9899:1990 + gnu extensions
492 -std=gnu99 iso9899:1999 + gnu extensions
494 const char *const argstart = &p[5];
496 if (!strcmp (argstart, "iso9899:1990")
497 || !strcmp (argstart, "c89"))
502 flag_traditional = 0;
503 flag_writable_strings = 0;
505 flag_no_nonansi_builtin = 1;
506 flag_noniso_default_format_attributes = 0;
509 else if (!strcmp (argstart, "iso9899:199409"))
514 else if (!strcmp (argstart, "iso9899:199x")
515 || !strcmp (argstart, "iso9899:1999")
516 || !strcmp (argstart, "c9x")
517 || !strcmp (argstart, "c99"))
519 flag_traditional = 0;
520 flag_writable_strings = 0;
522 flag_no_nonansi_builtin = 1;
523 flag_noniso_default_format_attributes = 0;
527 else if (!strcmp (argstart, "gnu89"))
529 flag_traditional = 0;
530 flag_writable_strings = 0;
532 flag_no_nonansi_builtin = 0;
533 flag_noniso_default_format_attributes = 1;
537 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
539 flag_traditional = 0;
540 flag_writable_strings = 0;
542 flag_no_nonansi_builtin = 0;
543 flag_noniso_default_format_attributes = 1;
548 error ("unknown C standard `%s'", argstart);
550 else if (!strcmp (p, "-fdollars-in-identifiers"))
551 dollars_in_ident = 1;
552 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
553 dollars_in_ident = 0;
554 else if (!strcmp (p, "-fsigned-char"))
555 flag_signed_char = 1;
556 else if (!strcmp (p, "-funsigned-char"))
557 flag_signed_char = 0;
558 else if (!strcmp (p, "-fno-signed-char"))
559 flag_signed_char = 0;
560 else if (!strcmp (p, "-fno-unsigned-char"))
561 flag_signed_char = 1;
562 else if (!strcmp (p, "-fsigned-bitfields")
563 || !strcmp (p, "-fno-unsigned-bitfields"))
565 flag_signed_bitfields = 1;
566 explicit_flag_signed_bitfields = 1;
568 else if (!strcmp (p, "-funsigned-bitfields")
569 || !strcmp (p, "-fno-signed-bitfields"))
571 flag_signed_bitfields = 0;
572 explicit_flag_signed_bitfields = 1;
574 else if (!strcmp (p, "-fshort-enums"))
575 flag_short_enums = 1;
576 else if (!strcmp (p, "-fno-short-enums"))
577 flag_short_enums = 0;
578 else if (!strcmp (p, "-fshort-wchar"))
579 flag_short_wchar = 1;
580 else if (!strcmp (p, "-fno-short-wchar"))
581 flag_short_wchar = 0;
582 else if (!strcmp (p, "-fcond-mismatch"))
583 flag_cond_mismatch = 1;
584 else if (!strcmp (p, "-fno-cond-mismatch"))
585 flag_cond_mismatch = 0;
586 else if (!strcmp (p, "-fshort-double"))
587 flag_short_double = 1;
588 else if (!strcmp (p, "-fno-short-double"))
589 flag_short_double = 0;
590 else if (!strcmp (p, "-fasm"))
592 else if (!strcmp (p, "-fno-asm"))
594 else if (!strcmp (p, "-fbuiltin"))
596 else if (!strcmp (p, "-fno-builtin"))
598 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
600 else if (!strcmp (p, "-ansi"))
602 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
603 mesg_implicit_function_declaration = 2;
604 else if (!strcmp (p, "-Wimplicit-function-declaration"))
605 mesg_implicit_function_declaration = 1;
606 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
607 mesg_implicit_function_declaration = 0;
608 else if (!strcmp (p, "-Wimplicit-int"))
609 warn_implicit_int = 1;
610 else if (!strcmp (p, "-Wno-implicit-int"))
611 warn_implicit_int = 0;
612 else if (!strcmp (p, "-Wimplicit"))
614 warn_implicit_int = 1;
615 if (mesg_implicit_function_declaration != 2)
616 mesg_implicit_function_declaration = 1;
618 else if (!strcmp (p, "-Wno-implicit"))
619 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
620 else if (!strcmp (p, "-Wlong-long"))
622 else if (!strcmp (p, "-Wno-long-long"))
624 else if (!strcmp (p, "-Wwrite-strings"))
625 flag_const_strings = 1;
626 else if (!strcmp (p, "-Wno-write-strings"))
627 flag_const_strings = 0;
628 else if (!strcmp (p, "-Wcast-qual"))
630 else if (!strcmp (p, "-Wno-cast-qual"))
632 else if (!strcmp (p, "-Wbad-function-cast"))
633 warn_bad_function_cast = 1;
634 else if (!strcmp (p, "-Wno-bad-function-cast"))
635 warn_bad_function_cast = 0;
636 else if (!strcmp (p, "-Wno-missing-noreturn"))
637 warn_missing_noreturn = 0;
638 else if (!strcmp (p, "-Wmissing-format-attribute"))
639 warn_missing_format_attribute = 1;
640 else if (!strcmp (p, "-Wno-missing-format-attribute"))
641 warn_missing_format_attribute = 0;
642 else if (!strcmp (p, "-Wpointer-arith"))
643 warn_pointer_arith = 1;
644 else if (!strcmp (p, "-Wno-pointer-arith"))
645 warn_pointer_arith = 0;
646 else if (!strcmp (p, "-Wstrict-prototypes"))
647 warn_strict_prototypes = 1;
648 else if (!strcmp (p, "-Wno-strict-prototypes"))
649 warn_strict_prototypes = 0;
650 else if (!strcmp (p, "-Wmissing-prototypes"))
651 warn_missing_prototypes = 1;
652 else if (!strcmp (p, "-Wno-missing-prototypes"))
653 warn_missing_prototypes = 0;
654 else if (!strcmp (p, "-Wmissing-declarations"))
655 warn_missing_declarations = 1;
656 else if (!strcmp (p, "-Wno-missing-declarations"))
657 warn_missing_declarations = 0;
658 else if (!strcmp (p, "-Wredundant-decls"))
659 warn_redundant_decls = 1;
660 else if (!strcmp (p, "-Wno-redundant-decls"))
661 warn_redundant_decls = 0;
662 else if (!strcmp (p, "-Wnested-externs"))
663 warn_nested_externs = 1;
664 else if (!strcmp (p, "-Wno-nested-externs"))
665 warn_nested_externs = 0;
666 else if (!strcmp (p, "-Wtraditional"))
667 warn_traditional = 1;
668 else if (!strcmp (p, "-Wno-traditional"))
669 warn_traditional = 0;
670 else if (!strncmp (p, "-Wformat=", 9))
671 set_Wformat (atoi (p + 9));
672 else if (!strcmp (p, "-Wformat"))
674 else if (!strcmp (p, "-Wno-format"))
676 else if (!strcmp (p, "-Wformat-y2k"))
678 else if (!strcmp (p, "-Wno-format-y2k"))
680 else if (!strcmp (p, "-Wformat-extra-args"))
681 warn_format_extra_args = 1;
682 else if (!strcmp (p, "-Wno-format-extra-args"))
683 warn_format_extra_args = 0;
684 else if (!strcmp (p, "-Wformat-nonliteral"))
685 warn_format_nonliteral = 1;
686 else if (!strcmp (p, "-Wno-format-nonliteral"))
687 warn_format_nonliteral = 0;
688 else if (!strcmp (p, "-Wformat-security"))
689 warn_format_security = 1;
690 else if (!strcmp (p, "-Wno-format-security"))
691 warn_format_security = 0;
692 else if (!strcmp (p, "-Wchar-subscripts"))
693 warn_char_subscripts = 1;
694 else if (!strcmp (p, "-Wno-char-subscripts"))
695 warn_char_subscripts = 0;
696 else if (!strcmp (p, "-Wconversion"))
698 else if (!strcmp (p, "-Wno-conversion"))
700 else if (!strcmp (p, "-Wparentheses"))
701 warn_parentheses = 1;
702 else if (!strcmp (p, "-Wno-parentheses"))
703 warn_parentheses = 0;
704 else if (!strcmp (p, "-Wreturn-type"))
705 warn_return_type = 1;
706 else if (!strcmp (p, "-Wno-return-type"))
707 warn_return_type = 0;
708 else if (!strcmp (p, "-Wsequence-point"))
709 warn_sequence_point = 1;
710 else if (!strcmp (p, "-Wno-sequence-point"))
711 warn_sequence_point = 0;
712 else if (!strcmp (p, "-Wcomment"))
713 ; /* cpp handles this one. */
714 else if (!strcmp (p, "-Wno-comment"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p, "-Wcomments"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wno-comments"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wtrigraphs"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wno-trigraphs"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wundef"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wno-undef"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wimport"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wno-import"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wmissing-braces"))
733 warn_missing_braces = 1;
734 else if (!strcmp (p, "-Wno-missing-braces"))
735 warn_missing_braces = 0;
736 else if (!strcmp (p, "-Wmain"))
738 else if (!strcmp (p, "-Wno-main"))
740 else if (!strcmp (p, "-Wsign-compare"))
741 warn_sign_compare = 1;
742 else if (!strcmp (p, "-Wno-sign-compare"))
743 warn_sign_compare = 0;
744 else if (!strcmp (p, "-Wfloat-equal"))
745 warn_float_equal = 1;
746 else if (!strcmp (p, "-Wno-float-equal"))
747 warn_float_equal = 0;
748 else if (!strcmp (p, "-Wmultichar"))
750 else if (!strcmp (p, "-Wno-multichar"))
752 else if (!strcmp (p, "-Wunknown-pragmas"))
753 /* Set to greater than 1, so that even unknown pragmas in system
754 headers will be warned about. */
755 warn_unknown_pragmas = 2;
756 else if (!strcmp (p, "-Wno-unknown-pragmas"))
757 warn_unknown_pragmas = 0;
758 else if (!strcmp (p, "-Wall"))
760 /* We save the value of warn_uninitialized, since if they put
761 -Wuninitialized on the command line, we need to generate a
762 warning about not using it without also specifying -O. */
763 if (warn_uninitialized != 1)
764 warn_uninitialized = 2;
765 warn_implicit_int = 1;
766 mesg_implicit_function_declaration = 1;
767 warn_return_type = 1;
771 warn_char_subscripts = 1;
772 warn_parentheses = 1;
773 warn_sequence_point = 1;
774 warn_missing_braces = 1;
775 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
776 it off only if it's not explicit. */
778 /* Only warn about unknown pragmas that are not in system headers. */
779 warn_unknown_pragmas = 1;
782 return strings_processed;
787 /* Hooks for print_node. */
790 print_lang_decl (file, node, indent)
791 FILE *file ATTRIBUTE_UNUSED;
792 tree node ATTRIBUTE_UNUSED;
793 int indent ATTRIBUTE_UNUSED;
798 print_lang_type (file, node, indent)
799 FILE *file ATTRIBUTE_UNUSED;
800 tree node ATTRIBUTE_UNUSED;
801 int indent ATTRIBUTE_UNUSED;
806 print_lang_identifier (file, node, indent)
811 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
812 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
813 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
814 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
815 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
816 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
817 if (C_IS_RESERVED_WORD (node))
819 tree rid = ridpointers[C_RID_CODE (node)];
820 indent_to (file, indent + 4);
821 fprintf (file, "rid ");
822 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
823 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
827 /* Hook called at end of compilation to assume 1 elt
828 for a top-level tentative array defn that wasn't complete before. */
831 finish_incomplete_decl (decl)
834 if (TREE_CODE (decl) == VAR_DECL)
836 tree type = TREE_TYPE (decl);
837 if (type != error_mark_node
838 && TREE_CODE (type) == ARRAY_TYPE
839 && ! DECL_EXTERNAL (decl)
840 && TYPE_DOMAIN (type) == 0)
842 warning_with_decl (decl, "array `%s' assumed to have one element");
844 complete_array_type (type, NULL_TREE, 1);
846 layout_decl (decl, 0);
851 /* Create a new `struct binding_level'. */
853 static struct binding_level *
854 make_binding_level ()
857 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
860 /* Nonzero if we are currently in the global binding level. */
865 return current_binding_level == global_binding_level;
871 keep_next_level_flag = 1;
874 /* Nonzero if the current level needs to have a BLOCK made. */
879 return ((current_binding_level->keep_if_subblocks
880 && current_binding_level->blocks != 0)
881 || current_binding_level->keep
882 || current_binding_level->names != 0
883 || (current_binding_level->tags != 0
884 && !current_binding_level->tag_transparent));
887 /* Identify this binding level as a level of parameters.
888 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
889 But it turns out there is no way to pass the right value for
890 DEFINITION_FLAG, so we ignore it. */
893 declare_parm_level (definition_flag)
894 int definition_flag ATTRIBUTE_UNUSED;
896 current_binding_level->parm_flag = 1;
899 /* Nonzero if currently making parm declarations. */
904 return current_binding_level->parm_flag;
907 /* Enter a new binding level.
908 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
909 not for that of tags. */
912 pushlevel (tag_transparent)
915 struct binding_level *newlevel = NULL_BINDING_LEVEL;
917 /* If this is the top level of a function,
918 just make sure that NAMED_LABELS is 0. */
920 if (current_binding_level == global_binding_level)
925 /* Reuse or create a struct for this binding level. */
927 if (free_binding_level)
929 newlevel = free_binding_level;
930 free_binding_level = free_binding_level->level_chain;
934 newlevel = make_binding_level ();
937 /* Add this level to the front of the chain (stack) of levels that
940 *newlevel = clear_binding_level;
941 newlevel->tag_transparent
943 || (current_binding_level
944 ? current_binding_level->subblocks_tag_transparent
946 newlevel->level_chain = current_binding_level;
947 current_binding_level = newlevel;
948 newlevel->keep = keep_next_level_flag;
949 keep_next_level_flag = 0;
950 newlevel->keep_if_subblocks = keep_next_if_subblocks;
951 keep_next_if_subblocks = 0;
954 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
957 clear_limbo_values (block)
962 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
963 if (DECL_NAME (tem) != 0)
964 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
966 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
967 clear_limbo_values (tem);
970 /* Exit a binding level.
971 Pop the level off, and restore the state of the identifier-decl mappings
972 that were in effect when this level was entered.
974 If KEEP is nonzero, this level had explicit declarations, so
975 and create a "block" (a BLOCK node) for the level
976 to record its declarations and subblocks for symbol table output.
978 If FUNCTIONBODY is nonzero, this level is the body of a function,
979 so create a block as if KEEP were set and also clear out all
982 If REVERSE is nonzero, reverse the order of decls before putting
983 them into the BLOCK. */
986 poplevel (keep, reverse, functionbody)
992 /* The chain of decls was accumulated in reverse order.
993 Put it into forward order, just for cleanliness. */
995 tree tags = current_binding_level->tags;
996 tree subblocks = current_binding_level->blocks;
999 int block_previously_created;
1001 keep |= current_binding_level->keep;
1003 /* This warning is turned off because it causes warnings for
1004 declarations like `extern struct foo *x'. */
1006 /* Warn about incomplete structure types in this level. */
1007 for (link = tags; link; link = TREE_CHAIN (link))
1008 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1010 tree type = TREE_VALUE (link);
1011 tree type_name = TYPE_NAME (type);
1012 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1014 : DECL_NAME (type_name));
1015 switch (TREE_CODE (type))
1018 error ("`struct %s' incomplete in scope ending here", id);
1021 error ("`union %s' incomplete in scope ending here", id);
1024 error ("`enum %s' incomplete in scope ending here", id);
1030 /* Get the decls in the order they were written.
1031 Usually current_binding_level->names is in reverse order.
1032 But parameter decls were previously put in forward order. */
1035 current_binding_level->names
1036 = decls = nreverse (current_binding_level->names);
1038 decls = current_binding_level->names;
1040 /* Output any nested inline functions within this block
1041 if they weren't already output. */
1043 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1044 if (TREE_CODE (decl) == FUNCTION_DECL
1045 && ! TREE_ASM_WRITTEN (decl)
1046 && DECL_INITIAL (decl) != 0
1047 && TREE_ADDRESSABLE (decl))
1049 /* If this decl was copied from a file-scope decl
1050 on account of a block-scope extern decl,
1051 propagate TREE_ADDRESSABLE to the file-scope decl.
1053 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1054 true, since then the decl goes through save_for_inline_copying. */
1055 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1056 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1057 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1060 /* We used to warn about unused variables in expand_end_bindings,
1061 i.e. while generating RTL. But in function-at-a-time mode we may
1062 choose to never expand a function at all (e.g. auto inlining), so
1063 we do this explicitly now. */
1064 warn_about_unused_variables (getdecls ());
1066 /* If there were any declarations or structure tags in that level,
1067 or if this level is a function body,
1068 create a BLOCK to record them for the life of this function. */
1071 block_previously_created = (current_binding_level->this_block != 0);
1072 if (block_previously_created)
1073 block = current_binding_level->this_block;
1074 else if (keep || functionbody
1075 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1076 block = make_node (BLOCK);
1079 BLOCK_VARS (block) = decls;
1080 BLOCK_SUBBLOCKS (block) = subblocks;
1083 /* In each subblock, record that this is its superior. */
1085 for (link = subblocks; link; link = TREE_CHAIN (link))
1086 BLOCK_SUPERCONTEXT (link) = block;
1088 /* Clear out the meanings of the local variables of this level. */
1090 for (link = decls; link; link = TREE_CHAIN (link))
1092 if (DECL_NAME (link) != 0)
1094 /* If the ident. was used or addressed via a local extern decl,
1095 don't forget that fact. */
1096 if (DECL_EXTERNAL (link))
1098 if (TREE_USED (link))
1099 TREE_USED (DECL_NAME (link)) = 1;
1100 if (TREE_ADDRESSABLE (link))
1101 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1103 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1107 /* Restore all name-meanings of the outer levels
1108 that were shadowed by this level. */
1110 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1111 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1113 /* If the level being exited is the top level of a function,
1114 check over all the labels, and clear out the current
1115 (function local) meanings of their names. */
1119 clear_limbo_values (block);
1121 /* If this is the top level block of a function,
1122 the vars are the function's parameters.
1123 Don't leave them in the BLOCK because they are
1124 found in the FUNCTION_DECL instead. */
1126 BLOCK_VARS (block) = 0;
1128 /* Clear out the definitions of all label names,
1129 since their scopes end here,
1130 and add them to BLOCK_VARS. */
1132 for (link = named_labels; link; link = TREE_CHAIN (link))
1134 tree label = TREE_VALUE (link);
1136 if (DECL_INITIAL (label) == 0)
1138 error_with_decl (label, "label `%s' used but not defined");
1139 /* Avoid crashing later. */
1140 define_label (input_filename, lineno,
1143 else if (warn_unused_label && !TREE_USED (label))
1144 warning_with_decl (label, "label `%s' defined but not used");
1145 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1147 /* Put the labels into the "variables" of the
1148 top-level block, so debugger can see them. */
1149 TREE_CHAIN (label) = BLOCK_VARS (block);
1150 BLOCK_VARS (block) = label;
1154 /* Pop the current level, and free the structure for reuse. */
1157 struct binding_level *level = current_binding_level;
1158 current_binding_level = current_binding_level->level_chain;
1160 level->level_chain = free_binding_level;
1161 free_binding_level = level;
1164 /* Dispose of the block that we just made inside some higher level. */
1166 DECL_INITIAL (current_function_decl) = block;
1169 if (!block_previously_created)
1170 current_binding_level->blocks
1171 = chainon (current_binding_level->blocks, block);
1173 /* If we did not make a block for the level just exited,
1174 any blocks made for inner levels
1175 (since they cannot be recorded as subblocks in that level)
1176 must be carried forward so they will later become subblocks
1177 of something else. */
1179 current_binding_level->blocks
1180 = chainon (current_binding_level->blocks, subblocks);
1182 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1183 binding contour so that they point to the appropriate construct, i.e.
1184 either to the current FUNCTION_DECL node, or else to the BLOCK node
1185 we just constructed.
1187 Note that for tagged types whose scope is just the formal parameter
1188 list for some function type specification, we can't properly set
1189 their TYPE_CONTEXTs here, because we don't have a pointer to the
1190 appropriate FUNCTION_TYPE node readily available to us. For those
1191 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1192 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1193 node which will represent the "scope" for these "parameter list local"
1197 for (link = tags; link; link = TREE_CHAIN (link))
1198 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1200 for (link = tags; link; link = TREE_CHAIN (link))
1201 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1204 TREE_USED (block) = 1;
1209 /* Delete the node BLOCK from the current binding level.
1210 This is used for the block inside a stmt expr ({...})
1211 so that the block can be reinserted where appropriate. */
1214 delete_block (block)
1218 if (current_binding_level->blocks == block)
1219 current_binding_level->blocks = TREE_CHAIN (block);
1220 for (t = current_binding_level->blocks; t;)
1222 if (TREE_CHAIN (t) == block)
1223 TREE_CHAIN (t) = TREE_CHAIN (block);
1227 TREE_CHAIN (block) = NULL;
1228 /* Clear TREE_USED which is always set by poplevel.
1229 The flag is set again if insert_block is called. */
1230 TREE_USED (block) = 0;
1233 /* Insert BLOCK at the end of the list of subblocks of the
1234 current binding level. This is used when a BIND_EXPR is expanded,
1235 to handle the BLOCK node inside the BIND_EXPR. */
1238 insert_block (block)
1241 TREE_USED (block) = 1;
1242 current_binding_level->blocks
1243 = chainon (current_binding_level->blocks, block);
1246 /* Set the BLOCK node for the innermost scope
1247 (the one we are currently in). */
1253 current_binding_level->this_block = block;
1254 current_binding_level->names = chainon (current_binding_level->names,
1255 BLOCK_VARS (block));
1256 current_binding_level->blocks = chainon (current_binding_level->blocks,
1257 BLOCK_SUBBLOCKS (block));
1263 struct binding_level *newlevel;
1265 /* Reuse or create a struct for this binding level. */
1267 if (free_binding_level)
1269 newlevel = free_binding_level;
1270 free_binding_level = free_binding_level->level_chain;
1274 newlevel = make_binding_level ();
1277 /* Add this level to the front of the chain (stack) of label levels. */
1279 newlevel->level_chain = label_level_chain;
1280 label_level_chain = newlevel;
1282 newlevel->names = named_labels;
1283 newlevel->shadowed = shadowed_labels;
1285 shadowed_labels = 0;
1291 struct binding_level *level = label_level_chain;
1294 /* Clear out the definitions of the declared labels in this level.
1295 Leave in the list any ordinary, non-declared labels. */
1296 for (link = named_labels, prev = 0; link;)
1298 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1300 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1302 error_with_decl (TREE_VALUE (link),
1303 "label `%s' used but not defined");
1304 /* Avoid crashing later. */
1305 define_label (input_filename, lineno,
1306 DECL_NAME (TREE_VALUE (link)));
1308 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1309 warning_with_decl (TREE_VALUE (link),
1310 "label `%s' defined but not used");
1311 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1313 /* Delete this element from the list. */
1314 link = TREE_CHAIN (link);
1316 TREE_CHAIN (prev) = link;
1318 named_labels = link;
1323 link = TREE_CHAIN (link);
1327 /* Bring back all the labels that were shadowed. */
1328 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1329 if (DECL_NAME (TREE_VALUE (link)) != 0)
1330 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1331 = TREE_VALUE (link);
1333 named_labels = chainon (named_labels, level->names);
1334 shadowed_labels = level->shadowed;
1336 /* Pop the current level, and free the structure for reuse. */
1337 label_level_chain = label_level_chain->level_chain;
1338 level->level_chain = free_binding_level;
1339 free_binding_level = level;
1342 /* Push a definition or a declaration of struct, union or enum tag "name".
1343 "type" should be the type node.
1344 We assume that the tag "name" is not already defined.
1346 Note that the definition may really be just a forward reference.
1347 In that case, the TYPE_SIZE will be zero. */
1350 pushtag (name, type)
1353 struct binding_level *b;
1355 /* Find the proper binding level for this type tag. */
1357 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1362 /* Record the identifier as the type's name if it has none. */
1364 if (TYPE_NAME (type) == 0)
1365 TYPE_NAME (type) = name;
1368 b->tags = tree_cons (name, type, b->tags);
1370 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1371 tagged type we just added to the current binding level. This fake
1372 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1373 to output a representation of a tagged type, and it also gives
1374 us a convenient place to record the "scope start" address for the
1377 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1379 /* An approximation for now, so we can tell this is a function-scope tag.
1380 This will be updated in poplevel. */
1381 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1384 /* Handle when a new declaration NEWDECL
1385 has the same name as an old one OLDDECL
1386 in the same binding contour.
1387 Prints an error message if appropriate.
1389 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1390 Otherwise, return 0.
1392 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1393 and OLDDECL is in an outer binding level and should thus not be changed. */
1396 duplicate_decls (newdecl, olddecl, different_binding_level)
1397 tree newdecl, olddecl;
1398 int different_binding_level;
1400 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1401 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1402 && DECL_INITIAL (newdecl) != 0);
1403 tree oldtype = TREE_TYPE (olddecl);
1404 tree newtype = TREE_TYPE (newdecl);
1407 if (DECL_P (olddecl))
1408 DECL_ATTRIBUTES (newdecl)
1409 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1411 if (TREE_CODE (newtype) == ERROR_MARK
1412 || TREE_CODE (oldtype) == ERROR_MARK)
1415 /* New decl is completely inconsistent with the old one =>
1416 tell caller to replace the old one.
1417 This is always an error except in the case of shadowing a builtin. */
1418 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1420 if (TREE_CODE (olddecl) == FUNCTION_DECL
1421 && (DECL_BUILT_IN (olddecl)
1422 || DECL_BUILT_IN_NONANSI (olddecl)))
1424 /* If you declare a built-in or predefined function name as static,
1425 the old definition is overridden,
1426 but optionally warn this was a bad choice of name. */
1427 if (!TREE_PUBLIC (newdecl))
1431 else if (DECL_BUILT_IN (olddecl))
1432 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1434 warning_with_decl (newdecl, "shadowing library function `%s'");
1436 /* Likewise, if the built-in is not ansi, then programs can
1437 override it even globally without an error. */
1438 else if (! DECL_BUILT_IN (olddecl))
1439 warning_with_decl (newdecl,
1440 "library function `%s' declared as non-function");
1442 else if (DECL_BUILT_IN_NONANSI (olddecl))
1443 warning_with_decl (newdecl,
1444 "built-in function `%s' declared as non-function");
1446 warning_with_decl (newdecl,
1447 "built-in function `%s' declared as non-function");
1451 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1452 error_with_decl (olddecl, "previous declaration of `%s'");
1458 /* For real parm decl following a forward decl,
1459 return 1 so old decl will be reused. */
1460 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1461 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1464 /* The new declaration is the same kind of object as the old one.
1465 The declarations may partially match. Print warnings if they don't
1466 match enough. Ultimately, copy most of the information from the new
1467 decl to the old one, and keep using the old one. */
1469 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1470 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1471 && DECL_INITIAL (olddecl) == 0)
1472 /* If -traditional, avoid error for redeclaring fcn
1473 after implicit decl. */
1475 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1476 && DECL_BUILT_IN (olddecl))
1478 /* A function declaration for a built-in function. */
1479 if (!TREE_PUBLIC (newdecl))
1481 /* If you declare a built-in function name as static, the
1482 built-in definition is overridden,
1483 but optionally warn this was a bad choice of name. */
1485 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1486 /* Discard the old built-in function. */
1489 else if (!types_match)
1491 /* Accept the return type of the new declaration if same modes. */
1492 tree oldreturntype = TREE_TYPE (oldtype);
1493 tree newreturntype = TREE_TYPE (newtype);
1495 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1497 /* Function types may be shared, so we can't just modify
1498 the return type of olddecl's function type. */
1500 = build_function_type (newreturntype,
1501 TYPE_ARG_TYPES (oldtype));
1502 trytype = build_type_attribute_variant (trytype,
1503 TYPE_ATTRIBUTES (oldtype));
1505 types_match = comptypes (newtype, trytype);
1509 /* Accept harmless mismatch in first argument type also.
1510 This is for the ffs and fprintf builtins. */
1511 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1512 && TYPE_ARG_TYPES (oldtype) != 0
1513 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1514 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1515 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1516 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1518 /* Function types may be shared, so we can't just modify
1519 the return type of olddecl's function type. */
1521 = build_function_type (TREE_TYPE (oldtype),
1522 tree_cons (NULL_TREE,
1523 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1524 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1525 trytype = build_type_attribute_variant (trytype,
1526 TYPE_ATTRIBUTES (oldtype));
1528 types_match = comptypes (newtype, trytype);
1532 if (! different_binding_level)
1533 TREE_TYPE (olddecl) = oldtype;
1537 /* If types don't match for a built-in, throw away the built-in. */
1538 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1542 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1543 && DECL_SOURCE_LINE (olddecl) == 0)
1545 /* A function declaration for a predeclared function
1546 that isn't actually built in. */
1547 if (!TREE_PUBLIC (newdecl))
1549 /* If you declare it as static, the
1550 default definition is overridden. */
1553 else if (!types_match)
1555 /* If the types don't match, preserve volatility indication.
1556 Later on, we will discard everything else about the
1557 default declaration. */
1558 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1561 /* Permit char *foo () to match void *foo (...) if not pedantic,
1562 if one of them came from a system header file. */
1563 else if (!types_match
1564 && TREE_CODE (olddecl) == FUNCTION_DECL
1565 && TREE_CODE (newdecl) == FUNCTION_DECL
1566 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1567 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1568 && (DECL_IN_SYSTEM_HEADER (olddecl)
1569 || DECL_IN_SYSTEM_HEADER (newdecl))
1570 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1571 && TYPE_ARG_TYPES (oldtype) == 0
1572 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1573 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1575 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1576 && TYPE_ARG_TYPES (newtype) == 0
1577 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1578 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1581 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1582 /* Make sure we keep void * as ret type, not char *. */
1583 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1584 TREE_TYPE (newdecl) = newtype = oldtype;
1586 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1587 we will come back here again. */
1588 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1590 else if (!types_match
1591 /* Permit char *foo (int, ...); followed by char *foo ();
1593 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1595 /* Return types must still match. */
1596 && comptypes (TREE_TYPE (oldtype),
1597 TREE_TYPE (newtype))
1598 && TYPE_ARG_TYPES (newtype) == 0))
1600 error_with_decl (newdecl, "conflicting types for `%s'");
1601 /* Check for function type mismatch
1602 involving an empty arglist vs a nonempty one. */
1603 if (TREE_CODE (olddecl) == FUNCTION_DECL
1604 && comptypes (TREE_TYPE (oldtype),
1605 TREE_TYPE (newtype))
1606 && ((TYPE_ARG_TYPES (oldtype) == 0
1607 && DECL_INITIAL (olddecl) == 0)
1609 (TYPE_ARG_TYPES (newtype) == 0
1610 && DECL_INITIAL (newdecl) == 0)))
1612 /* Classify the problem further. */
1613 tree t = TYPE_ARG_TYPES (oldtype);
1615 t = TYPE_ARG_TYPES (newtype);
1616 for (; t; t = TREE_CHAIN (t))
1618 tree type = TREE_VALUE (t);
1620 if (TREE_CHAIN (t) == 0
1621 && TYPE_MAIN_VARIANT (type) != void_type_node)
1623 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1627 if (simple_type_promotes_to (type) != NULL_TREE)
1629 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1634 error_with_decl (olddecl, "previous declaration of `%s'");
1638 errmsg = redeclaration_error_message (newdecl, olddecl);
1644 error_with_decl (newdecl, "redefinition of `%s'");
1647 error_with_decl (newdecl, "redeclaration of `%s'");
1650 error_with_decl (newdecl, "conflicting declarations of `%s'");
1656 error_with_decl (olddecl,
1657 ((DECL_INITIAL (olddecl)
1658 && current_binding_level == global_binding_level)
1659 ? "`%s' previously defined here"
1660 : "`%s' previously declared here"));
1662 else if (TREE_CODE (newdecl) == TYPE_DECL
1663 && (DECL_IN_SYSTEM_HEADER (olddecl)
1664 || DECL_IN_SYSTEM_HEADER (newdecl)))
1666 warning_with_decl (newdecl, "redefinition of `%s'");
1669 ((DECL_INITIAL (olddecl)
1670 && current_binding_level == global_binding_level)
1671 ? "`%s' previously defined here"
1672 : "`%s' previously declared here"));
1674 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1675 && DECL_INITIAL (olddecl) != 0
1676 && TYPE_ARG_TYPES (oldtype) == 0
1677 && TYPE_ARG_TYPES (newtype) != 0
1678 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1682 /* Prototype decl follows defn w/o prototype. */
1684 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1685 type = TYPE_ARG_TYPES (newtype),
1688 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1690 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1691 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1693 warning_with_decl (newdecl, "prototype for `%s' follows");
1694 warning_with_decl (olddecl, "non-prototype definition here");
1697 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1698 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1700 error_with_decl (newdecl,
1701 "prototype for `%s' follows and number of arguments doesn't match");
1702 error_with_decl (olddecl, "non-prototype definition here");
1706 /* Type for passing arg must be consistent
1707 with that declared for the arg. */
1708 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1709 /* If -traditional, allow `unsigned int' instead of `int'
1710 in the prototype. */
1711 && (! (flag_traditional
1712 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1715 error_with_decl (newdecl,
1716 "prototype for `%s' follows and argument %d doesn't match",
1718 error_with_decl (olddecl, "non-prototype definition here");
1724 /* Warn about mismatches in various flags. */
1727 /* Warn if function is now inline
1728 but was previously declared not inline and has been called. */
1729 if (TREE_CODE (olddecl) == FUNCTION_DECL
1730 && ! DECL_DECLARED_INLINE_P (olddecl)
1731 && DECL_DECLARED_INLINE_P (newdecl)
1732 && TREE_USED (olddecl))
1733 warning_with_decl (newdecl,
1734 "`%s' declared inline after being called");
1735 if (TREE_CODE (olddecl) == FUNCTION_DECL
1736 && ! DECL_DECLARED_INLINE_P (olddecl)
1737 && DECL_DECLARED_INLINE_P (newdecl)
1738 && DECL_INITIAL (olddecl) != 0)
1739 warning_with_decl (newdecl,
1740 "`%s' declared inline after its definition");
1742 /* If pedantic, warn when static declaration follows a non-static
1743 declaration. Otherwise, do so only for functions. */
1744 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1745 && TREE_PUBLIC (olddecl)
1746 && !TREE_PUBLIC (newdecl))
1747 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1749 /* If warn_traditional, warn when a non-static function
1750 declaration follows a static one. */
1751 if (warn_traditional && !in_system_header
1752 && TREE_CODE (olddecl) == FUNCTION_DECL
1753 && !TREE_PUBLIC (olddecl)
1754 && TREE_PUBLIC (newdecl))
1755 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1757 /* Warn when const declaration follows a non-const
1758 declaration, but not for functions. */
1759 if (TREE_CODE (olddecl) != FUNCTION_DECL
1760 && !TREE_READONLY (olddecl)
1761 && TREE_READONLY (newdecl))
1762 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1763 /* These bits are logically part of the type, for variables.
1764 But not for functions
1765 (where qualifiers are not valid ANSI anyway). */
1766 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1767 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1768 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1769 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1773 /* Optionally warn about more than one declaration for the same name. */
1774 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1775 /* Don't warn about a function declaration
1776 followed by a definition. */
1777 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1778 && DECL_INITIAL (olddecl) == 0)
1779 /* Don't warn about extern decl followed by (tentative) definition. */
1780 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1782 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1783 warning_with_decl (olddecl, "previous declaration of `%s'");
1786 /* Copy all the DECL_... slots specified in the new decl
1787 except for any that we copy here from the old type.
1789 Past this point, we don't change OLDTYPE and NEWTYPE
1790 even if we change the types of NEWDECL and OLDDECL. */
1794 /* When copying info to olddecl, we store into write_olddecl
1795 instead. This allows us to avoid modifying olddecl when
1796 different_binding_level is true. */
1797 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1799 /* Merge the data types specified in the two decls. */
1800 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1802 if (different_binding_level)
1804 if (TYPE_ARG_TYPES (oldtype) != 0
1805 && TYPE_ARG_TYPES (newtype) == 0)
1806 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1809 = build_type_attribute_variant
1811 merge_attributes (TYPE_ATTRIBUTES (newtype),
1812 TYPE_ATTRIBUTES (oldtype)));
1816 = TREE_TYPE (olddecl)
1817 = common_type (newtype, oldtype);
1820 /* Lay the type out, unless already done. */
1821 if (oldtype != TREE_TYPE (newdecl))
1823 if (TREE_TYPE (newdecl) != error_mark_node)
1824 layout_type (TREE_TYPE (newdecl));
1825 if (TREE_CODE (newdecl) != FUNCTION_DECL
1826 && TREE_CODE (newdecl) != TYPE_DECL
1827 && TREE_CODE (newdecl) != CONST_DECL)
1828 layout_decl (newdecl, 0);
1832 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1833 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1834 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1835 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1836 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1837 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1839 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1840 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1844 /* Keep the old rtl since we can safely use it. */
1845 COPY_DECL_RTL (olddecl, newdecl);
1847 /* Merge the type qualifiers. */
1848 if (TREE_CODE (olddecl) == FUNCTION_DECL
1849 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1850 && ! TREE_THIS_VOLATILE (newdecl))
1851 TREE_THIS_VOLATILE (write_olddecl) = 0;
1853 if (TREE_READONLY (newdecl))
1854 TREE_READONLY (write_olddecl) = 1;
1856 if (TREE_THIS_VOLATILE (newdecl))
1858 TREE_THIS_VOLATILE (write_olddecl) = 1;
1859 if (TREE_CODE (newdecl) == VAR_DECL
1860 /* If an automatic variable is re-declared in the same
1861 function scope, but the old declaration was not
1862 volatile, make_var_volatile() would crash because the
1863 variable would have been assigned to a pseudo, not a
1864 MEM. Since this duplicate declaration is invalid
1865 anyway, we just skip the call. */
1867 make_var_volatile (newdecl);
1870 /* Keep source location of definition rather than declaration. */
1871 /* When called with different_binding_level set, keep the old
1872 information so that meaningful diagnostics can be given. */
1873 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1874 && ! different_binding_level)
1876 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1877 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1880 /* Merge the unused-warning information. */
1881 if (DECL_IN_SYSTEM_HEADER (olddecl))
1882 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1883 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1884 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1886 /* Merge the initialization information. */
1887 /* When called with different_binding_level set, don't copy over
1888 DECL_INITIAL, so that we don't accidentally change function
1889 declarations into function definitions. */
1890 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1891 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1893 /* Merge the section attribute.
1894 We want to issue an error if the sections conflict but that must be
1895 done later in decl_attributes since we are called before attributes
1897 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1898 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1900 /* Copy the assembler name.
1901 Currently, it can only be defined in the prototype. */
1902 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1904 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1906 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1907 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1909 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1910 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1911 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1912 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl)
1914 |= DECL_NO_LIMIT_STACK (olddecl);
1917 /* If cannot merge, then use the new type and qualifiers,
1918 and don't preserve the old rtl. */
1919 else if (! different_binding_level)
1921 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1922 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1923 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1924 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1927 /* Merge the storage class information. */
1928 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1929 /* For functions, static overrides non-static. */
1930 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1932 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1933 /* This is since we don't automatically
1934 copy the attributes of NEWDECL into OLDDECL. */
1935 /* No need to worry about different_binding_level here because
1936 then TREE_PUBLIC (newdecl) was true. */
1937 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1938 /* If this clears `static', clear it in the identifier too. */
1939 if (! TREE_PUBLIC (olddecl))
1940 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1942 if (DECL_EXTERNAL (newdecl))
1944 if (! different_binding_level)
1946 /* Don't mess with these flags on local externs; they remain
1947 external even if there's a declaration at file scope which
1949 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1950 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1952 /* An extern decl does not override previous storage class. */
1953 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1954 if (! DECL_EXTERNAL (newdecl))
1955 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1959 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1960 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1963 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1965 /* If we're redefining a function previously defined as extern
1966 inline, make sure we emit debug info for the inline before we
1967 throw it away, in case it was inlined into a function that hasn't
1968 been written out yet. */
1969 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1971 (*debug_hooks->outlining_inline_function) (olddecl);
1973 /* The new defn must not be inline. */
1974 DECL_INLINE (newdecl) = 0;
1975 DECL_UNINLINABLE (newdecl) = 1;
1979 /* If either decl says `inline', this fn is inline,
1980 unless its definition was passed already. */
1981 if (DECL_DECLARED_INLINE_P (newdecl)
1982 && DECL_DECLARED_INLINE_P (olddecl) == 0)
1983 DECL_DECLARED_INLINE_P (olddecl) = 1;
1985 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
1988 if (DECL_BUILT_IN (olddecl))
1990 /* Get rid of any built-in function if new arg types don't match it
1991 or if we have a function definition. */
1992 if (! types_match || new_is_definition)
1994 if (! different_binding_level)
1996 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1997 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2002 /* If redeclaring a builtin function, and not a definition,
2003 it stays built in. */
2004 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2005 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2008 /* Also preserve various other info from the definition. */
2009 else if (! new_is_definition)
2010 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2011 if (! new_is_definition)
2013 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2014 /* When called with different_binding_level set, don't copy over
2015 DECL_INITIAL, so that we don't accidentally change function
2016 declarations into function definitions. */
2017 if (! different_binding_level)
2018 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2019 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2020 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2021 if (DECL_INLINE (newdecl))
2022 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2025 if (different_binding_level)
2028 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2029 But preserve OLDDECL's DECL_UID. */
2031 unsigned olddecl_uid = DECL_UID (olddecl);
2033 memcpy ((char *) olddecl + sizeof (struct tree_common),
2034 (char *) newdecl + sizeof (struct tree_common),
2035 sizeof (struct tree_decl) - sizeof (struct tree_common));
2036 DECL_UID (olddecl) = olddecl_uid;
2039 /* NEWDECL contains the merged attribute lists.
2040 Update OLDDECL to be the same. */
2041 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2046 /* Record a decl-node X as belonging to the current lexical scope.
2047 Check for errors (such as an incompatible declaration for the same
2048 name already seen in the same scope).
2050 Returns either X or an old decl for the same name.
2051 If an old decl is returned, it may have been smashed
2052 to agree with what X says. */
2059 tree name = DECL_NAME (x);
2060 struct binding_level *b = current_binding_level;
2062 /* Functions need the lang_decl data. */
2063 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2064 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2065 ggc_alloc_cleared (sizeof (struct lang_decl));
2067 DECL_CONTEXT (x) = current_function_decl;
2068 /* A local extern declaration for a function doesn't constitute nesting.
2069 A local auto declaration does, since it's a forward decl
2070 for a nested function coming later. */
2071 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2072 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2073 DECL_CONTEXT (x) = 0;
2075 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2076 && x != IDENTIFIER_IMPLICIT_DECL (name)
2077 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2078 && !DECL_IN_SYSTEM_HEADER (x))
2079 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2085 int different_binding_level = 0;
2087 t = lookup_name_current_level (name);
2088 /* Don't type check externs here when -traditional. This is so that
2089 code with conflicting declarations inside blocks will get warnings
2090 not errors. X11 for instance depends on this. */
2091 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2093 t = IDENTIFIER_GLOBAL_VALUE (name);
2094 /* Type decls at global scope don't conflict with externs declared
2095 inside lexical blocks. */
2096 if (t && TREE_CODE (t) == TYPE_DECL)
2098 different_binding_level = 1;
2100 if (t != 0 && t == error_mark_node)
2101 /* error_mark_node is 0 for a while during initialization! */
2104 error_with_decl (x, "`%s' used prior to declaration");
2109 file = DECL_SOURCE_FILE (t);
2110 line = DECL_SOURCE_LINE (t);
2113 /* If this decl is `static' and an implicit decl was seen previously,
2114 warn. But don't complain if -traditional,
2115 since traditional compilers don't complain. */
2116 if (! flag_traditional && TREE_PUBLIC (name)
2117 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2118 sets this for all functions. */
2119 && ! TREE_PUBLIC (x)
2120 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2121 /* We used to warn also for explicit extern followed by static,
2122 but sometimes you need to do it that way. */
2123 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2125 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2126 IDENTIFIER_POINTER (name));
2127 pedwarn_with_file_and_line
2128 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2129 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2130 "previous declaration of `%s'",
2131 IDENTIFIER_POINTER (name));
2132 TREE_THIS_VOLATILE (name) = 1;
2135 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2137 if (TREE_CODE (t) == PARM_DECL)
2139 /* Don't allow more than one "real" duplicate
2140 of a forward parm decl. */
2141 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2147 /* If we are processing a typedef statement, generate a whole new
2148 ..._TYPE node (which will be just an variant of the existing
2149 ..._TYPE node with identical properties) and then install the
2150 TYPE_DECL node generated to represent the typedef name as the
2151 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2153 The whole point here is to end up with a situation where each
2154 and every ..._TYPE node the compiler creates will be uniquely
2155 associated with AT MOST one node representing a typedef name.
2156 This way, even though the compiler substitutes corresponding
2157 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2158 early on, later parts of the compiler can always do the reverse
2159 translation and get back the corresponding typedef name. For
2162 typedef struct S MY_TYPE;
2165 Later parts of the compiler might only know that `object' was of
2166 type `struct S' if it were not for code just below. With this
2167 code however, later parts of the compiler see something like:
2169 struct S' == struct S
2170 typedef struct S' MY_TYPE;
2173 And they can then deduce (from the node for type struct S') that
2174 the original object declaration was:
2178 Being able to do this is important for proper support of protoize,
2179 and also for generating precise symbolic debugging information
2180 which takes full account of the programmer's (typedef) vocabulary.
2182 Obviously, we don't want to generate a duplicate ..._TYPE node if
2183 the TYPE_DECL node that we are now processing really represents a
2184 standard built-in type.
2186 Since all standard types are effectively declared at line zero
2187 in the source file, we can easily check to see if we are working
2188 on a standard type by checking the current value of lineno. */
2190 if (TREE_CODE (x) == TYPE_DECL)
2192 if (DECL_SOURCE_LINE (x) == 0)
2194 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2195 TYPE_NAME (TREE_TYPE (x)) = x;
2197 else if (TREE_TYPE (x) != error_mark_node
2198 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2200 tree tt = TREE_TYPE (x);
2201 DECL_ORIGINAL_TYPE (x) = tt;
2202 tt = build_type_copy (tt);
2204 TREE_USED (tt) = TREE_USED (x);
2209 /* Multiple external decls of the same identifier ought to match.
2210 Check against both global declarations (when traditional) and out of
2211 scope (limbo) block level declarations.
2213 We get warnings about inline functions where they are defined.
2214 Avoid duplicate warnings where they are used. */
2216 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2220 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2221 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2222 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2223 decl = IDENTIFIER_GLOBAL_VALUE (name);
2224 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2225 /* Decls in limbo are always extern, so no need to check that. */
2226 decl = IDENTIFIER_LIMBO_VALUE (name);
2230 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2231 /* If old decl is built-in, we already warned if we should. */
2232 && !DECL_BUILT_IN (decl))
2234 pedwarn_with_decl (x,
2235 "type mismatch with previous external decl");
2236 pedwarn_with_decl (decl, "previous external decl of `%s'");
2240 /* If a function has had an implicit declaration, and then is defined,
2241 make sure they are compatible. */
2243 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2244 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2245 && TREE_CODE (x) == FUNCTION_DECL
2246 && ! comptypes (TREE_TYPE (x),
2247 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2249 warning_with_decl (x, "type mismatch with previous implicit declaration");
2250 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2251 "previous implicit declaration of `%s'");
2254 /* In PCC-compatibility mode, extern decls of vars with no current decl
2255 take effect at top level no matter where they are. */
2256 if (flag_traditional && DECL_EXTERNAL (x)
2257 && lookup_name (name) == 0)
2259 tree type = TREE_TYPE (x);
2261 /* But don't do this if the type contains temporary nodes. */
2264 if (type == error_mark_node)
2266 if (TYPE_CONTEXT (type))
2268 warning_with_decl (x, "type of external `%s' is not global");
2269 /* By exiting the loop early, we leave TYPE nonzero,
2270 and thus prevent globalization of the decl. */
2273 else if (TREE_CODE (type) == FUNCTION_TYPE
2274 && TYPE_ARG_TYPES (type) != 0)
2275 /* The types might not be truly local,
2276 but the list of arg types certainly is temporary.
2277 Since prototypes are nontraditional,
2278 ok not to do the traditional thing. */
2280 type = TREE_TYPE (type);
2284 b = global_binding_level;
2287 /* This name is new in its binding level.
2288 Install the new declaration and return it. */
2289 if (b == global_binding_level)
2291 /* Install a global value. */
2293 /* If the first global decl has external linkage,
2294 warn if we later see static one. */
2295 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2296 TREE_PUBLIC (name) = 1;
2298 IDENTIFIER_GLOBAL_VALUE (name) = x;
2300 /* We no longer care about any previous block level declarations. */
2301 IDENTIFIER_LIMBO_VALUE (name) = 0;
2303 /* Don't forget if the function was used via an implicit decl. */
2304 if (IDENTIFIER_IMPLICIT_DECL (name)
2305 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2306 TREE_USED (x) = 1, TREE_USED (name) = 1;
2308 /* Don't forget if its address was taken in that way. */
2309 if (IDENTIFIER_IMPLICIT_DECL (name)
2310 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2311 TREE_ADDRESSABLE (x) = 1;
2313 /* Warn about mismatches against previous implicit decl. */
2314 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2315 /* If this real decl matches the implicit, don't complain. */
2316 && ! (TREE_CODE (x) == FUNCTION_DECL
2317 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2318 == integer_type_node)))
2319 pedwarn ("`%s' was previously implicitly declared to return `int'",
2320 IDENTIFIER_POINTER (name));
2322 /* If this decl is `static' and an `extern' was seen previously,
2323 that is erroneous. */
2324 if (TREE_PUBLIC (name)
2325 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2327 /* Okay to redeclare an ANSI built-in as static. */
2328 if (t != 0 && DECL_BUILT_IN (t))
2330 /* Okay to declare a non-ANSI built-in as anything. */
2331 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2333 /* Okay to have global type decl after an earlier extern
2334 declaration inside a lexical block. */
2335 else if (TREE_CODE (x) == TYPE_DECL)
2337 else if (IDENTIFIER_IMPLICIT_DECL (name))
2339 if (! TREE_THIS_VOLATILE (name))
2340 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2341 IDENTIFIER_POINTER (name));
2344 pedwarn ("`%s' was declared `extern' and later `static'",
2345 IDENTIFIER_POINTER (name));
2350 /* Here to install a non-global value. */
2351 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2352 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2354 IDENTIFIER_LOCAL_VALUE (name) = x;
2356 /* If this is an extern function declaration, see if we
2357 have a global definition or declaration for the function. */
2360 && TREE_CODE (x) == FUNCTION_DECL
2361 && TREE_CODE (oldglobal) == FUNCTION_DECL
2362 && DECL_EXTERNAL (x)
2363 && ! DECL_DECLARED_INLINE_P (x))
2365 /* We have one. Their types must agree. */
2366 if (! comptypes (TREE_TYPE (x),
2367 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2368 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2371 /* Inner extern decl is inline if global one is.
2372 Copy enough to really inline it. */
2373 if (DECL_DECLARED_INLINE_P (oldglobal))
2375 DECL_DECLARED_INLINE_P (x)
2376 = DECL_DECLARED_INLINE_P (oldglobal);
2377 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2378 DECL_INITIAL (x) = (current_function_decl == oldglobal
2379 ? 0 : DECL_INITIAL (oldglobal));
2380 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2381 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2382 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2383 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2384 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2385 DECL_ABSTRACT_ORIGIN (x)
2386 = DECL_ABSTRACT_ORIGIN (oldglobal);
2388 /* Inner extern decl is built-in if global one is. */
2389 if (DECL_BUILT_IN (oldglobal))
2391 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2392 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2394 /* Keep the arg types from a file-scope fcn defn. */
2395 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2396 && DECL_INITIAL (oldglobal)
2397 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2398 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2403 /* This case is probably sometimes the right thing to do. */
2404 /* If we have a local external declaration,
2405 then any file-scope declaration should not
2406 have been static. */
2407 if (oldlocal == 0 && oldglobal != 0
2408 && !TREE_PUBLIC (oldglobal)
2409 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2410 warning ("`%s' locally external but globally static",
2411 IDENTIFIER_POINTER (name));
2414 /* If we have a local external declaration,
2415 and no file-scope declaration has yet been seen,
2416 then if we later have a file-scope decl it must not be static. */
2418 && DECL_EXTERNAL (x)
2422 TREE_PUBLIC (name) = 1;
2424 /* Save this decl, so that we can do type checking against
2425 other decls after it falls out of scope.
2427 Only save it once. This prevents temporary decls created in
2428 expand_inline_function from being used here, since this
2429 will have been set when the inline function was parsed.
2430 It also helps give slightly better warnings. */
2431 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2432 IDENTIFIER_LIMBO_VALUE (name) = x;
2435 /* Warn if shadowing an argument at the top level of the body. */
2436 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2437 /* This warning doesn't apply to the parms of a nested fcn. */
2438 && ! current_binding_level->parm_flag
2439 /* Check that this is one level down from the parms. */
2440 && current_binding_level->level_chain->parm_flag
2441 /* Check that the decl being shadowed
2442 comes from the parm level, one level up. */
2443 && chain_member (oldlocal, current_binding_level->level_chain->names))
2445 if (TREE_CODE (oldlocal) == PARM_DECL)
2446 pedwarn ("declaration of `%s' shadows a parameter",
2447 IDENTIFIER_POINTER (name));
2449 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2450 IDENTIFIER_POINTER (name));
2453 /* Maybe warn if shadowing something else. */
2454 else if (warn_shadow && !DECL_EXTERNAL (x)
2455 /* No shadow warnings for internally generated vars. */
2456 && DECL_SOURCE_LINE (x) != 0
2457 /* No shadow warnings for vars made for inlining. */
2458 && ! DECL_FROM_INLINE (x))
2460 const char *id = IDENTIFIER_POINTER (name);
2462 if (TREE_CODE (x) == PARM_DECL
2463 && current_binding_level->level_chain->parm_flag)
2464 /* Don't warn about the parm names in function declarator
2465 within a function declarator.
2466 It would be nice to avoid warning in any function
2467 declarator in a declaration, as opposed to a definition,
2468 but there is no way to tell it's not a definition. */
2470 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2471 warning ("declaration of `%s' shadows a parameter", id);
2472 else if (oldlocal != 0)
2473 warning ("declaration of `%s' shadows previous local", id);
2474 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2475 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2476 warning ("declaration of `%s' shadows global declaration", id);
2479 /* If storing a local value, there may already be one (inherited).
2480 If so, record it for restoration when this binding level ends. */
2482 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2485 /* Keep count of variables in this level with incomplete type.
2486 If the input is erroneous, we can have error_mark in the type
2487 slot (e.g. "f(void a, ...)") - that doesn't count as an
2489 if (TREE_TYPE (x) != error_mark_node
2490 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2494 /* Put decls on list in reverse order.
2495 We will reverse them later if necessary. */
2496 TREE_CHAIN (x) = b->names;
2502 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2505 pushdecl_top_level (x)
2509 struct binding_level *b = current_binding_level;
2511 current_binding_level = global_binding_level;
2513 current_binding_level = b;
2517 /* Generate an implicit declaration for identifier FUNCTIONID
2518 as a function of type int (). Print a warning if appropriate. */
2521 implicitly_declare (functionid)
2525 int traditional_warning = 0;
2526 /* Only one "implicit declaration" warning per identifier. */
2527 int implicit_warning;
2529 /* We used to reuse an old implicit decl here,
2530 but this loses with inline functions because it can clobber
2531 the saved decl chains. */
2533 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2534 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2537 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2539 /* Warn of implicit decl following explicit local extern decl.
2540 This is probably a program designed for traditional C. */
2541 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2542 traditional_warning = 1;
2544 /* Warn once of an implicit declaration. */
2545 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2547 DECL_EXTERNAL (decl) = 1;
2548 TREE_PUBLIC (decl) = 1;
2550 /* Record that we have an implicit decl and this is it. */
2551 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2553 /* ANSI standard says implicit declarations are in the innermost block.
2554 So we record the decl in the standard fashion.
2555 If flag_traditional is set, pushdecl does it top-level. */
2558 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2559 maybe_objc_check_decl (decl);
2561 rest_of_decl_compilation (decl, NULL, 0, 0);
2563 if (implicit_warning)
2564 implicit_decl_warning (functionid);
2565 else if (warn_traditional && traditional_warning)
2566 warning ("function `%s' was previously declared within a block",
2567 IDENTIFIER_POINTER (functionid));
2569 /* Write a record describing this implicit function declaration to the
2570 prototypes file (if requested). */
2572 gen_aux_info_record (decl, 0, 1, 0);
2574 /* Possibly apply some default attributes to this implicit declaration. */
2575 decl_attributes (&decl, NULL_TREE, 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_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2628 && ! (DECL_DECLARED_INLINE_P (newdecl)
2629 && DECL_EXTERNAL (newdecl))))
2633 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2635 /* Objects declared at top level: */
2636 /* If at least one is a reference, it's ok. */
2637 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2639 /* Reject two definitions. */
2640 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2642 /* Now we have two tentative defs, or one tentative and one real def. */
2643 /* Insist that the linkage match. */
2644 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2648 else if (current_binding_level->parm_flag
2649 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2653 /* Newdecl has block scope. If olddecl has block scope also, then
2654 reject two definitions, and reject a definition together with an
2655 external reference. Otherwise, it is OK, because newdecl must
2656 be an extern reference to olddecl. */
2657 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2658 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2664 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2665 Create one if none exists so far for the current function.
2666 This function is called for both label definitions and label references. */
2672 tree decl = IDENTIFIER_LABEL_VALUE (id);
2674 if (current_function_decl == 0)
2676 error ("label %s referenced outside of any function",
2677 IDENTIFIER_POINTER (id));
2681 /* Use a label already defined or ref'd with this name. */
2684 /* But not if it is inherited and wasn't declared to be inheritable. */
2685 if (DECL_CONTEXT (decl) != current_function_decl
2686 && ! C_DECLARED_LABEL_FLAG (decl))
2687 return shadow_label (id);
2691 decl = build_decl (LABEL_DECL, id, void_type_node);
2693 /* A label not explicitly declared must be local to where it's ref'd. */
2694 DECL_CONTEXT (decl) = current_function_decl;
2696 DECL_MODE (decl) = VOIDmode;
2698 /* Say where one reference is to the label,
2699 for the sake of the error if it is not defined. */
2700 DECL_SOURCE_LINE (decl) = lineno;
2701 DECL_SOURCE_FILE (decl) = input_filename;
2703 IDENTIFIER_LABEL_VALUE (id) = decl;
2705 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2710 /* Make a label named NAME in the current function,
2711 shadowing silently any that may be inherited from containing functions
2712 or containing scopes.
2714 Note that valid use, if the label being shadowed
2715 comes from another scope in the same function,
2716 requires calling declare_nonlocal_label right away. */
2722 tree decl = IDENTIFIER_LABEL_VALUE (name);
2728 /* Check to make sure that the label hasn't already been declared
2729 at this label scope */
2730 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2731 if (TREE_VALUE (dup) == decl)
2733 error ("duplicate label declaration `%s'",
2734 IDENTIFIER_POINTER (name));
2735 error_with_decl (TREE_VALUE (dup),
2736 "this is a previous declaration");
2737 /* Just use the previous declaration. */
2738 return lookup_label (name);
2741 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2742 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2745 return lookup_label (name);
2748 /* Define a label, specifying the location in the source file.
2749 Return the LABEL_DECL node for the label, if the definition is valid.
2750 Otherwise return 0. */
2753 define_label (filename, line, name)
2754 const char *filename;
2758 tree decl = lookup_label (name);
2760 /* If label with this name is known from an outer context, shadow it. */
2761 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2763 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2764 IDENTIFIER_LABEL_VALUE (name) = 0;
2765 decl = lookup_label (name);
2768 if (warn_traditional && !in_system_header && lookup_name (name))
2769 warning_with_file_and_line (filename, line,
2770 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2771 IDENTIFIER_POINTER (name));
2773 if (DECL_INITIAL (decl) != 0)
2775 error_with_file_and_line (filename, line, "duplicate label `%s'",
2776 IDENTIFIER_POINTER (name));
2781 /* Mark label as having been defined. */
2782 DECL_INITIAL (decl) = error_mark_node;
2783 /* Say where in the source. */
2784 DECL_SOURCE_FILE (decl) = filename;
2785 DECL_SOURCE_LINE (decl) = line;
2790 /* Return the list of declarations of the current level.
2791 Note that this list is in reverse order unless/until
2792 you nreverse it; and when you do nreverse it, you must
2793 store the result back using `storedecls' or you will lose. */
2798 return current_binding_level->names;
2801 /* Return the list of type-tags (for structs, etc) of the current level. */
2806 return current_binding_level->tags;
2809 /* Store the list of declarations of the current level.
2810 This is done for the parameter declarations of a function being defined,
2811 after they are modified in the light of any missing parameters. */
2817 current_binding_level->names = decls;
2820 /* Similarly, store the list of tags of the current level. */
2826 current_binding_level->tags = tags;
2829 /* Given NAME, an IDENTIFIER_NODE,
2830 return the structure (or union or enum) definition for that name.
2831 Searches binding levels from BINDING_LEVEL up to the global level.
2832 If THISLEVEL_ONLY is nonzero, searches only the specified context
2833 (but skips any tag-transparent contexts to find one that is
2834 meaningful for tags).
2835 CODE says which kind of type the caller wants;
2836 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2837 If the wrong kind of type is found, an error is reported. */
2840 lookup_tag (code, name, binding_level, thislevel_only)
2841 enum tree_code code;
2842 struct binding_level *binding_level;
2846 struct binding_level *level;
2849 for (level = binding_level; level; level = level->level_chain)
2852 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2854 if (TREE_PURPOSE (tail) == name)
2856 if (TREE_CODE (TREE_VALUE (tail)) != code)
2858 /* Definition isn't the kind we were looking for. */
2859 pending_invalid_xref = name;
2860 pending_invalid_xref_file = input_filename;
2861 pending_invalid_xref_line = lineno;
2862 /* If in the same binding level as a declaration as a tag
2863 of a different type, this must not be allowed to
2864 shadow that tag, so give the error immediately.
2865 (For example, "struct foo; union foo;" is invalid.) */
2867 pending_xref_error ();
2869 return TREE_VALUE (tail);
2872 if (! level->tag_transparent)
2882 /* Print an error message now
2883 for a recent invalid struct, union or enum cross reference.
2884 We don't print them immediately because they are not invalid
2885 when used in the `struct foo;' construct for shadowing. */
2888 pending_xref_error ()
2890 if (pending_invalid_xref != 0)
2891 error_with_file_and_line (pending_invalid_xref_file,
2892 pending_invalid_xref_line,
2893 "`%s' defined as wrong kind of tag",
2894 IDENTIFIER_POINTER (pending_invalid_xref));
2895 pending_invalid_xref = 0;
2898 /* Given a type, find the tag that was defined for it and return the tag name.
2899 Otherwise return 0. */
2902 lookup_tag_reverse (type)
2905 struct binding_level *level;
2907 for (level = current_binding_level; level; level = level->level_chain)
2910 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2912 if (TREE_VALUE (tail) == type)
2913 return TREE_PURPOSE (tail);
2919 /* Look up NAME in the current binding level and its superiors
2920 in the namespace of variables, functions and typedefs.
2921 Return a ..._DECL node of some kind representing its definition,
2922 or return 0 if it is undefined. */
2930 if (current_binding_level != global_binding_level
2931 && IDENTIFIER_LOCAL_VALUE (name))
2932 val = IDENTIFIER_LOCAL_VALUE (name);
2934 val = IDENTIFIER_GLOBAL_VALUE (name);
2938 /* Similar to `lookup_name' but look only at current binding level. */
2941 lookup_name_current_level (name)
2946 if (current_binding_level == global_binding_level)
2947 return IDENTIFIER_GLOBAL_VALUE (name);
2949 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2952 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2953 if (DECL_NAME (t) == name)
2959 /* Mark ARG for GC. */
2962 mark_binding_level (arg)
2965 struct binding_level *level = *(struct binding_level **) arg;
2967 for (; level != 0; level = level->level_chain)
2969 ggc_mark_tree (level->names);
2970 ggc_mark_tree (level->tags);
2971 ggc_mark_tree (level->shadowed);
2972 ggc_mark_tree (level->blocks);
2973 ggc_mark_tree (level->this_block);
2974 ggc_mark_tree (level->parm_order);
2978 /* Create the predefined scalar types of C,
2979 and some nodes representing standard constants (0, 1, (void *) 0).
2980 Initialize the global binding level.
2981 Make definitions for built-in primitive functions. */
2984 init_decl_processing ()
2987 tree ptr_ftype_void, ptr_ftype_ptr;
2989 current_function_decl = NULL;
2990 named_labels = NULL;
2991 current_binding_level = NULL_BINDING_LEVEL;
2992 free_binding_level = NULL_BINDING_LEVEL;
2994 /* Make the binding_level structure for global names. */
2996 global_binding_level = current_binding_level;
2998 build_common_tree_nodes (flag_signed_char);
3000 c_common_nodes_and_builtins ();
3002 boolean_type_node = integer_type_node;
3003 boolean_true_node = integer_one_node;
3004 boolean_false_node = integer_zero_node;
3006 /* With GCC, C99's _Bool is always of size 1. */
3007 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3008 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3009 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3010 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3011 TYPE_PRECISION (c_bool_type_node) = 1;
3012 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3014 c_bool_false_node = build_int_2 (0, 0);
3015 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3016 c_bool_true_node = build_int_2 (1, 0);
3017 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3019 endlink = void_list_node;
3020 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3022 = build_function_type (ptr_type_node,
3023 tree_cons (NULL_TREE, ptr_type_node, endlink));
3025 /* Types which are common to the fortran compiler and libf2c. When
3026 changing these, you also need to be concerned with f/com.h. */
3028 if (TYPE_PRECISION (float_type_node)
3029 == TYPE_PRECISION (long_integer_type_node))
3031 g77_integer_type_node = long_integer_type_node;
3032 g77_uinteger_type_node = long_unsigned_type_node;
3034 else if (TYPE_PRECISION (float_type_node)
3035 == TYPE_PRECISION (integer_type_node))
3037 g77_integer_type_node = integer_type_node;
3038 g77_uinteger_type_node = unsigned_type_node;
3041 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3043 if (g77_integer_type_node != NULL_TREE)
3045 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3046 g77_integer_type_node));
3047 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3048 g77_uinteger_type_node));
3051 if (TYPE_PRECISION (float_type_node) * 2
3052 == TYPE_PRECISION (long_integer_type_node))
3054 g77_longint_type_node = long_integer_type_node;
3055 g77_ulongint_type_node = long_unsigned_type_node;
3057 else if (TYPE_PRECISION (float_type_node) * 2
3058 == TYPE_PRECISION (long_long_integer_type_node))
3060 g77_longint_type_node = long_long_integer_type_node;
3061 g77_ulongint_type_node = long_long_unsigned_type_node;
3064 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3066 if (g77_longint_type_node != NULL_TREE)
3068 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3069 g77_longint_type_node));
3070 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3071 g77_ulongint_type_node));
3074 pedantic_lvalues = pedantic;
3076 make_fname_decl = c_make_fname_decl;
3077 start_fname_decls ();
3079 incomplete_decl_finalize_hook = finish_incomplete_decl;
3081 /* Record our roots. */
3083 ggc_add_tree_root (c_global_trees, CTI_MAX);
3084 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3085 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3086 ggc_add_tree_root (&named_labels, 1);
3087 ggc_add_tree_root (&shadowed_labels, 1);
3088 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3089 mark_binding_level);
3090 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3091 mark_binding_level);
3092 ggc_add_tree_root (&static_ctors, 1);
3093 ggc_add_tree_root (&static_dtors, 1);
3096 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3097 decl, NAME is the initialization string and TYPE_DEP indicates whether
3098 NAME depended on the type of the function. As we don't yet implement
3099 delayed emission of static data, we mark the decl as emitted
3100 so it is not placed in the output. Anything using it must therefore pull
3101 out the STRING_CST initializer directly. This does mean that these names
3102 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3105 c_make_fname_decl (id, type_dep)
3109 const char *name = fname_as_string (type_dep);
3110 tree decl, type, init;
3111 size_t length = strlen (name);
3113 type = build_array_type
3114 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3115 build_index_type (size_int (length)));
3117 decl = build_decl (VAR_DECL, id, type);
3118 /* We don't push the decl, so have to set its context here. */
3119 DECL_CONTEXT (decl) = current_function_decl;
3121 TREE_STATIC (decl) = 1;
3122 TREE_READONLY (decl) = 1;
3123 DECL_ARTIFICIAL (decl) = 1;
3125 init = build_string (length + 1, name);
3126 TREE_TYPE (init) = type;
3127 DECL_INITIAL (decl) = init;
3129 TREE_USED (decl) = 1;
3131 finish_decl (decl, init, NULL_TREE);
3136 /* Return a definition for a builtin function named NAME and whose data type
3137 is TYPE. TYPE should be a function type with argument types.
3138 FUNCTION_CODE tells later passes how to compile calls to this function.
3139 See tree.h for its possible values.
3141 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3142 the name to be called if we can't opencode the function. */
3145 builtin_function (name, type, function_code, class, library_name)
3149 enum built_in_class class;
3150 const char *library_name;
3152 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3153 DECL_EXTERNAL (decl) = 1;
3154 TREE_PUBLIC (decl) = 1;
3155 /* If -traditional, permit redefining a builtin function any way you like.
3156 (Though really, if the program redefines these functions,
3157 it probably won't work right unless compiled with -fno-builtin.) */
3158 if (flag_traditional && name[0] != '_')
3159 DECL_BUILT_IN_NONANSI (decl) = 1;
3161 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3162 make_decl_rtl (decl, NULL);
3164 DECL_BUILT_IN_CLASS (decl) = class;
3165 DECL_FUNCTION_CODE (decl) = function_code;
3167 /* Warn if a function in the namespace for users
3168 is used without an occasion to consider it declared. */
3169 if (name[0] != '_' || name[1] != '_')
3170 C_DECL_ANTICIPATED (decl) = 1;
3172 /* Possibly apply some default attributes to this built-in function. */
3173 decl_attributes (&decl, NULL_TREE, 0);
3178 /* Apply default attributes to a function, if a system function with default
3182 insert_default_attributes (decl)
3185 if (!TREE_PUBLIC (decl))
3187 c_common_insert_default_attributes (decl);
3190 /* Called when a declaration is seen that contains no names to declare.
3191 If its type is a reference to a structure, union or enum inherited
3192 from a containing scope, shadow that tag name for the current scope
3193 with a forward reference.
3194 If its type defines a new named structure or union
3195 or defines an enum, it is valid but we need not do anything here.
3196 Otherwise, it is an error. */
3199 shadow_tag (declspecs)
3202 shadow_tag_warned (declspecs, 0);
3206 shadow_tag_warned (declspecs, warned)
3209 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3216 pending_invalid_xref = 0;
3218 /* Remove the attributes from declspecs, since they will confuse the
3220 split_specs_attrs (declspecs, &specs, &attrs);
3222 for (link = specs; link; link = TREE_CHAIN (link))
3224 tree value = TREE_VALUE (link);
3225 enum tree_code code = TREE_CODE (value);
3227 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3228 /* Used to test also that TYPE_SIZE (value) != 0.
3229 That caused warning for `struct foo;' at top level in the file. */
3231 tree name = lookup_tag_reverse (value);
3238 if (warned != 1 && code != ENUMERAL_TYPE)
3239 /* Empty unnamed enum OK */
3241 pedwarn ("unnamed struct/union that defines no instances");
3247 t = lookup_tag (code, name, current_binding_level, 1);
3251 t = make_node (code);
3258 if (!warned && ! in_system_header)
3260 warning ("useless keyword or type name in empty declaration");
3267 error ("two types specified in one empty declaration");
3272 pedwarn ("empty declaration");
3276 /* Construct an array declarator. EXPR is the expression inside [], or
3277 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3278 to the pointer to which a parameter array is converted). STATIC_P is
3279 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3280 is non-zero is the array is [*], a VLA of unspecified length which is
3281 nevertheless a complete type (not currently implemented by GCC),
3282 zero otherwise. The declarator is constructed as an ARRAY_REF
3283 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3284 left of the [] (filled by in set_array_declarator_type) and operand 1
3285 is the expression inside; whose TREE_TYPE is the type qualifiers and
3286 which has TREE_STATIC set if "static" is used. */
3289 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3296 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3297 TREE_TYPE (decl) = quals;
3298 TREE_STATIC (decl) = (static_p ? 1 : 0);
3299 if (pedantic && !flag_isoc99)
3301 if (static_p || quals != NULL_TREE)
3302 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3304 pedwarn ("ISO C89 does not support `[*]' array declarators");
3307 warning ("GCC does not yet properly implement `[*]' array declarators");
3311 /* Set the type of an array declarator. DECL is the declarator, as
3312 constructed by build_array_declarator; TYPE is what appears on the left
3313 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3314 abstract declarator, zero otherwise; this is used to reject static and
3315 type qualifiers in abstract declarators, where they are not in the
3319 set_array_declarator_type (decl, type, abstract_p)
3324 TREE_OPERAND (decl, 0) = type;
3325 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3326 error ("static or type qualifiers in abstract declarator");
3330 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3333 groktypename (typename)
3336 if (TREE_CODE (typename) != TREE_LIST)
3338 return grokdeclarator (TREE_VALUE (typename),
3339 TREE_PURPOSE (typename),
3343 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3346 groktypename_in_parm_context (typename)
3349 if (TREE_CODE (typename) != TREE_LIST)
3351 return grokdeclarator (TREE_VALUE (typename),
3352 TREE_PURPOSE (typename),
3356 /* Decode a declarator in an ordinary declaration or data definition.
3357 This is called as soon as the type information and variable name
3358 have been parsed, before parsing the initializer if any.
3359 Here we create the ..._DECL node, fill in its type,
3360 and put it on the list of decls for the current context.
3361 The ..._DECL node is returned as the value.
3363 Exception: for arrays where the length is not specified,
3364 the type is left null, to be filled in by `finish_decl'.
3366 Function definitions do not come here; they go to start_function
3367 instead. However, external and forward declarations of functions
3368 do go through here. Structure field declarations are done by
3369 grokfield and not through here. */
3372 start_decl (declarator, declspecs, initialized, attributes)
3373 tree declarator, declspecs;
3377 tree decl = grokdeclarator (declarator, declspecs,
3378 NORMAL, initialized);
3381 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3382 && MAIN_NAME_P (DECL_NAME (decl)))
3383 warning_with_decl (decl, "`%s' is usually a function");
3386 /* Is it valid for this decl to have an initializer at all?
3387 If not, set INITIALIZED to zero, which will indirectly
3388 tell `finish_decl' to ignore the initializer once it is parsed. */
3389 switch (TREE_CODE (decl))
3392 /* typedef foo = bar means give foo the same type as bar.
3393 We haven't parsed bar yet, so `finish_decl' will fix that up.
3394 Any other case of an initialization in a TYPE_DECL is an error. */
3395 if (pedantic || list_length (declspecs) > 1)
3397 error ("typedef `%s' is initialized",
3398 IDENTIFIER_POINTER (DECL_NAME (decl)));
3404 error ("function `%s' is initialized like a variable",
3405 IDENTIFIER_POINTER (DECL_NAME (decl)));
3410 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3411 error ("parameter `%s' is initialized",
3412 IDENTIFIER_POINTER (DECL_NAME (decl)));
3417 /* Don't allow initializations for incomplete types
3418 except for arrays which might be completed by the initialization. */
3420 /* This can happen if the array size is an undefined macro. We already
3421 gave a warning, so we don't need another one. */
3422 if (TREE_TYPE (decl) == error_mark_node)
3424 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3426 /* A complete type is ok if size is fixed. */
3428 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3429 || C_DECL_VARIABLE_SIZE (decl))
3431 error ("variable-sized object may not be initialized");
3435 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3437 error ("variable `%s' has initializer but incomplete type",
3438 IDENTIFIER_POINTER (DECL_NAME (decl)));
3441 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3443 error ("elements of array `%s' have incomplete type",
3444 IDENTIFIER_POINTER (DECL_NAME (decl)));
3452 /* Seems redundant with grokdeclarator. */
3453 if (current_binding_level != global_binding_level
3454 && DECL_EXTERNAL (decl)
3455 && TREE_CODE (decl) != FUNCTION_DECL)
3456 warning ("declaration of `%s' has `extern' and is initialized",
3457 IDENTIFIER_POINTER (DECL_NAME (decl)));
3459 DECL_EXTERNAL (decl) = 0;
3460 if (current_binding_level == global_binding_level)
3461 TREE_STATIC (decl) = 1;
3463 /* Tell `pushdecl' this is an initialized decl
3464 even though we don't yet have the initializer expression.
3465 Also tell `finish_decl' it may store the real initializer. */
3466 DECL_INITIAL (decl) = error_mark_node;
3469 /* If this is a function declaration, write a record describing it to the
3470 prototypes file (if requested). */
3472 if (TREE_CODE (decl) == FUNCTION_DECL)
3473 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3475 /* ANSI specifies that a tentative definition which is not merged with
3476 a non-tentative definition behaves exactly like a definition with an
3477 initializer equal to zero. (Section 3.7.2)
3478 -fno-common gives strict ANSI behavior. Usually you don't want it.
3479 This matters only for variables with external linkage. */
3480 if (! flag_no_common || ! TREE_PUBLIC (decl))
3481 DECL_COMMON (decl) = 1;
3483 /* Set attributes here so if duplicate decl, will have proper attributes. */
3484 decl_attributes (&decl, attributes, 0);
3486 /* Add this decl to the current binding level.
3487 TEM may equal DECL or it may be a previous decl of the same name. */
3488 tem = pushdecl (decl);
3490 /* For a local variable, define the RTL now. */
3491 if (current_binding_level != global_binding_level
3492 /* But not if this is a duplicate decl
3493 and we preserved the rtl from the previous one
3494 (which may or may not happen). */
3495 && !DECL_RTL_SET_P (tem)
3496 && !DECL_CONTEXT (tem))
3498 if (TREE_TYPE (tem) != error_mark_node
3499 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3501 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3502 && DECL_INITIAL (tem) != 0)
3509 /* Finish processing of a declaration;
3510 install its initial value.
3511 If the length of an array type is not known before,
3512 it must be determined now, from the initial value, or it is an error. */
3515 finish_decl (decl, init, asmspec_tree)
3519 tree type = TREE_TYPE (decl);
3520 int was_incomplete = (DECL_SIZE (decl) == 0);
3521 const char *asmspec = 0;
3523 /* If a name was specified, get the string. */
3525 asmspec = TREE_STRING_POINTER (asmspec_tree);
3527 /* If `start_decl' didn't like having an initialization, ignore it now. */
3528 if (init != 0 && DECL_INITIAL (decl) == 0)
3531 /* Don't crash if parm is initialized. */
3532 if (TREE_CODE (decl) == PARM_DECL)
3537 if (TREE_CODE (decl) != TYPE_DECL)
3538 store_init_value (decl, init);
3541 /* typedef foo = bar; store the type of bar as the type of foo. */
3542 TREE_TYPE (decl) = TREE_TYPE (init);
3543 DECL_INITIAL (decl) = init = 0;
3547 /* Deduce size of array from initialization, if not already known */
3548 if (TREE_CODE (type) == ARRAY_TYPE
3549 && TYPE_DOMAIN (type) == 0
3550 && TREE_CODE (decl) != TYPE_DECL)
3553 = (TREE_STATIC (decl)
3554 /* Even if pedantic, an external linkage array
3555 may have incomplete type at first. */
3556 ? pedantic && !TREE_PUBLIC (decl)
3557 : !DECL_EXTERNAL (decl));
3559 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3561 /* Get the completed type made by complete_array_type. */
3562 type = TREE_TYPE (decl);
3565 error_with_decl (decl, "initializer fails to determine size of `%s'");
3567 else if (failure == 2)
3570 error_with_decl (decl, "array size missing in `%s'");
3571 /* If a `static' var's size isn't known,
3572 make it extern as well as static, so it does not get
3574 If it is not `static', then do not mark extern;
3575 finish_incomplete_decl will give it a default size
3576 and it will get allocated. */
3577 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3578 DECL_EXTERNAL (decl) = 1;
3581 /* TYPE_MAX_VALUE is always one less than the number of elements
3582 in the array, because we start counting at zero. Therefore,
3583 warn only if the value is less than zero. */
3584 else if (pedantic && TYPE_DOMAIN (type) != 0
3585 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3586 error_with_decl (decl, "zero or negative size array `%s'");
3588 layout_decl (decl, 0);
3591 if (TREE_CODE (decl) == VAR_DECL)
3593 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3594 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3595 layout_decl (decl, 0);
3597 if (DECL_SIZE (decl) == 0
3598 /* Don't give an error if we already gave one earlier. */
3599 && TREE_TYPE (decl) != error_mark_node
3600 && (TREE_STATIC (decl)
3602 /* A static variable with an incomplete type
3603 is an error if it is initialized.
3604 Also if it is not file scope.
3605 Otherwise, let it through, but if it is not `extern'
3606 then it may cause an error message later. */
3607 (DECL_INITIAL (decl) != 0
3608 || DECL_CONTEXT (decl) != 0)
3610 /* An automatic variable with an incomplete type
3612 !DECL_EXTERNAL (decl)))
3614 error_with_decl (decl, "storage size of `%s' isn't known");
3615 TREE_TYPE (decl) = error_mark_node;
3618 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3619 && DECL_SIZE (decl) != 0)
3621 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3622 constant_expression_warning (DECL_SIZE (decl));
3624 error_with_decl (decl, "storage size of `%s' isn't constant");
3627 if (TREE_USED (type))
3628 TREE_USED (decl) = 1;
3631 /* If this is a function and an assembler name is specified, it isn't
3632 builtin any more. Also reset DECL_RTL so we can give it its new
3634 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3636 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3637 SET_DECL_RTL (decl, NULL_RTX);
3638 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3641 /* Output the assembler code and/or RTL code for variables and functions,
3642 unless the type is an undefined structure or union.
3643 If not, it will get done when the type is completed. */
3645 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3647 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3648 maybe_objc_check_decl (decl);
3650 if (!DECL_CONTEXT (decl))
3652 if (DECL_INITIAL (decl) == NULL_TREE
3653 || DECL_INITIAL (decl) == error_mark_node)
3654 /* Don't output anything
3655 when a tentative file-scope definition is seen.
3656 But at end of compilation, do output code for them. */
3657 DECL_DEFER_OUTPUT (decl) = 1;
3658 rest_of_decl_compilation (decl, asmspec,
3659 (DECL_CONTEXT (decl) == 0
3660 || TREE_ASM_WRITTEN (decl)), 0);
3664 /* This is a local variable. If there is an ASMSPEC, the
3665 user has requested that we handle it specially. */
3668 /* In conjunction with an ASMSPEC, the `register'
3669 keyword indicates that we should place the variable
3670 in a particular register. */
3671 if (DECL_REGISTER (decl))
3672 DECL_C_HARD_REGISTER (decl) = 1;
3674 /* If this is not a static variable, issue a warning.
3675 It doesn't make any sense to give an ASMSPEC for an
3676 ordinary, non-register local variable. Historically,
3677 GCC has accepted -- but ignored -- the ASMSPEC in
3679 if (TREE_CODE (decl) == VAR_DECL
3680 && !DECL_REGISTER (decl)
3681 && !TREE_STATIC (decl))
3682 warning_with_decl (decl,
3683 "ignoring asm-specifier for non-static local variable `%s'");
3685 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3688 add_decl_stmt (decl);
3691 if (DECL_CONTEXT (decl) != 0)
3693 /* Recompute the RTL of a local array now
3694 if it used to be an incomplete type. */
3696 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3698 /* If we used it already as memory, it must stay in memory. */
3699 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3700 /* If it's still incomplete now, no init will save it. */
3701 if (DECL_SIZE (decl) == 0)
3702 DECL_INITIAL (decl) = 0;
3707 if (TREE_CODE (decl) == TYPE_DECL)
3709 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3710 maybe_objc_check_decl (decl);
3711 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3714 /* At the end of a declaration, throw away any variable type sizes
3715 of types defined inside that declaration. There is no use
3716 computing them in the following function definition. */
3717 if (current_binding_level == global_binding_level)
3718 get_pending_sizes ();
3721 /* If DECL has a cleanup, build and return that cleanup here.
3722 This is a callback called by expand_expr. */
3725 maybe_build_cleanup (decl)
3726 tree decl ATTRIBUTE_UNUSED;
3728 /* There are no cleanups in C. */
3732 /* Given a parsed parameter declaration,
3733 decode it into a PARM_DECL and push that on the current binding level.
3734 Also, for the sake of forward parm decls,
3735 record the given order of parms in `parm_order'. */
3738 push_parm_decl (parm)
3742 int old_immediate_size_expand = immediate_size_expand;
3743 /* Don't try computing parm sizes now -- wait till fn is called. */
3744 immediate_size_expand = 0;
3746 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3747 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3748 decl_attributes (&decl, TREE_VALUE (parm), 0);
3751 if (DECL_NAME (decl))
3754 olddecl = lookup_name (DECL_NAME (decl));
3755 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3756 pedwarn_with_decl (decl,
3757 "ANSI C forbids parameter `%s' shadowing typedef");
3761 decl = pushdecl (decl);
3763 immediate_size_expand = old_immediate_size_expand;
3765 current_binding_level->parm_order
3766 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3768 /* Add this decl to the current binding level. */
3769 finish_decl (decl, NULL_TREE, NULL_TREE);
3772 /* Clear the given order of parms in `parm_order'.
3773 Used at start of parm list,
3774 and also at semicolon terminating forward decls. */
3779 current_binding_level->parm_order = NULL_TREE;
3782 /* Make TYPE a complete type based on INITIAL_VALUE.
3783 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3784 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3787 complete_array_type (type, initial_value, do_default)
3792 tree maxindex = NULL_TREE;
3797 /* Note MAXINDEX is really the maximum index,
3798 one less than the size. */
3799 if (TREE_CODE (initial_value) == STRING_CST)
3802 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3803 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3806 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3808 tree elts = CONSTRUCTOR_ELTS (initial_value);
3809 maxindex = build_int_2 (-1, -1);
3810 for (; elts; elts = TREE_CHAIN (elts))
3812 if (TREE_PURPOSE (elts))
3813 maxindex = TREE_PURPOSE (elts);
3815 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3816 maxindex, integer_one_node));
3818 maxindex = copy_node (maxindex);
3822 /* Make an error message unless that happened already. */
3823 if (initial_value != error_mark_node)
3826 /* Prevent further error messages. */
3827 maxindex = build_int_2 (0, 0);
3834 maxindex = build_int_2 (0, 0);
3840 TYPE_DOMAIN (type) = build_index_type (maxindex);
3841 if (!TREE_TYPE (maxindex))
3842 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3845 /* Lay out the type now that we can get the real answer. */
3852 /* Given declspecs and a declarator,
3853 determine the name and type of the object declared
3854 and construct a ..._DECL node for it.
3855 (In one case we can return a ..._TYPE node instead.
3856 For invalid input we sometimes return 0.)
3858 DECLSPECS is a chain of tree_list nodes whose value fields
3859 are the storage classes and type specifiers.
3861 DECL_CONTEXT says which syntactic context this declaration is in:
3862 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3863 FUNCDEF for a function definition. Like NORMAL but a few different
3864 error messages in each case. Return value may be zero meaning
3865 this definition is too screwy to try to parse.
3866 PARM for a parameter declaration (either within a function prototype
3867 or before a function body). Make a PARM_DECL, or return void_type_node.
3868 TYPENAME if for a typename (in a cast or sizeof).
3869 Don't make a DECL node; just return the ..._TYPE node.
3870 FIELD for a struct or union field; make a FIELD_DECL.
3871 BITFIELD for a field with specified width.
3872 INITIALIZED is 1 if the decl has an initializer.
3874 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3875 It may also be so in the PARM case, for a prototype where the
3876 argument type is specified but not the name.
3878 This function is where the complicated C meanings of `static'
3879 and `extern' are interpreted. */
3882 grokdeclarator (declarator, declspecs, decl_context, initialized)
3885 enum decl_context decl_context;
3890 tree type = NULL_TREE;
3895 int type_quals = TYPE_UNQUALIFIED;
3897 int explicit_int = 0;
3898 int explicit_char = 0;
3899 int defaulted_int = 0;
3900 tree typedef_decl = 0;
3902 tree typedef_type = 0;
3903 int funcdef_flag = 0;
3904 enum tree_code innermost_code = ERROR_MARK;
3906 int size_varies = 0;
3907 tree decl_attr = NULL_TREE;
3908 tree array_ptr_quals = NULL_TREE;
3909 int array_parm_static = 0;
3910 tree returned_attrs = NULL_TREE;
3912 if (decl_context == BITFIELD)
3913 bitfield = 1, decl_context = FIELD;
3915 if (decl_context == FUNCDEF)
3916 funcdef_flag = 1, decl_context = NORMAL;
3918 /* Look inside a declarator for the name being declared
3919 and get it as a string, for an error message. */
3921 tree decl = declarator;
3925 switch (TREE_CODE (decl))
3930 innermost_code = TREE_CODE (decl);
3931 decl = TREE_OPERAND (decl, 0);
3935 decl = TREE_VALUE (decl);
3938 case IDENTIFIER_NODE:
3939 name = IDENTIFIER_POINTER (decl);
3950 /* A function definition's declarator must have the form of
3951 a function declarator. */
3953 if (funcdef_flag && innermost_code != CALL_EXPR)
3956 /* Anything declared one level down from the top level
3957 must be one of the parameters of a function
3958 (because the body is at least two levels down). */
3960 /* If this looks like a function definition, make it one,
3961 even if it occurs where parms are expected.
3962 Then store_parm_decls will reject it and not use it as a parm. */
3963 if (decl_context == NORMAL && !funcdef_flag
3964 && current_binding_level->parm_flag)
3965 decl_context = PARM;
3967 /* Look through the decl specs and record which ones appear.
3968 Some typespecs are defined as built-in typenames.
3969 Others, the ones that are modifiers of other types,
3970 are represented by bits in SPECBITS: set the bits for
3971 the modifiers that appear. Storage class keywords are also in SPECBITS.
3973 If there is a typedef name or a type, store the type in TYPE.
3974 This includes builtin typedefs such as `int'.
3976 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3977 and did not come from a user typedef.
3979 Set LONGLONG if `long' is mentioned twice. */
3981 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3983 tree id = TREE_VALUE (spec);
3985 if (id == ridpointers[(int) RID_INT])
3987 if (id == ridpointers[(int) RID_CHAR])
3990 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3992 enum rid i = C_RID_CODE (id);
3993 if ((int) i <= (int) RID_LAST_MODIFIER)
3995 if (i == RID_LONG && (specbits & (1 << (int) i)))
3998 error ("`long long long' is too long for GCC");
4001 if (pedantic && !flag_isoc99 && ! in_system_header
4003 pedwarn ("ISO C89 does not support `long long'");
4007 else if (specbits & (1 << (int) i))
4008 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4009 specbits |= 1 << (int) i;
4014 error ("two or more data types in declaration of `%s'", name);
4015 /* Actual typedefs come to us as TYPE_DECL nodes. */
4016 else if (TREE_CODE (id) == TYPE_DECL)
4018 type = TREE_TYPE (id);
4019 decl_attr = DECL_ATTRIBUTES (id);
4022 /* Built-in types come as identifiers. */
4023 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4025 tree t = lookup_name (id);
4026 if (TREE_TYPE (t) == error_mark_node)
4028 else if (!t || TREE_CODE (t) != TYPE_DECL)
4029 error ("`%s' fails to be a typedef or built in type",
4030 IDENTIFIER_POINTER (id));
4033 type = TREE_TYPE (t);
4037 else if (TREE_CODE (id) != ERROR_MARK)
4044 typedef_type = type;
4046 size_varies = C_TYPE_VARIABLE_SIZE (type);
4048 /* No type at all: default to `int', and set DEFAULTED_INT
4049 because it was not a user-defined typedef. */
4053 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4054 | (1 << (int) RID_SIGNED)
4055 | (1 << (int) RID_UNSIGNED)
4056 | (1 << (int) RID_COMPLEX))))
4057 /* Don't warn about typedef foo = bar. */
4058 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4059 && ! in_system_header)
4061 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4062 and this is a function, or if -Wimplicit; prefer the former
4063 warning since it is more explicit. */
4064 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4066 warn_about_return_type = 1;
4067 else if (warn_implicit_int || flag_isoc99)
4068 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4073 type = integer_type_node;
4076 /* Now process the modifiers that were specified
4077 and check for invalid combinations. */
4079 /* Long double is a special combination. */
4081 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4082 && TYPE_MAIN_VARIANT (type) == double_type_node)
4084 specbits &= ~(1 << (int) RID_LONG);
4085 type = long_double_type_node;
4088 /* Check all other uses of type modifiers. */
4090 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4091 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4095 if ((specbits & 1 << (int) RID_LONG)
4096 && (specbits & 1 << (int) RID_SHORT))
4097 error ("both long and short specified for `%s'", name);
4098 else if (((specbits & 1 << (int) RID_LONG)
4099 || (specbits & 1 << (int) RID_SHORT))
4101 error ("long or short specified with char for `%s'", name);
4102 else if (((specbits & 1 << (int) RID_LONG)
4103 || (specbits & 1 << (int) RID_SHORT))
4104 && TREE_CODE (type) == REAL_TYPE)
4106 static int already = 0;
4108 error ("long or short specified with floating type for `%s'", name);
4109 if (! already && ! pedantic)
4111 error ("the only valid combination is `long double'");
4115 else if ((specbits & 1 << (int) RID_SIGNED)
4116 && (specbits & 1 << (int) RID_UNSIGNED))
4117 error ("both signed and unsigned specified for `%s'", name);
4118 else if (TREE_CODE (type) != INTEGER_TYPE)
4119 error ("long, short, signed or unsigned invalid for `%s'", name);
4123 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4125 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4127 if (flag_pedantic_errors)
4132 /* Discard the type modifiers if they are invalid. */
4135 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4136 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4141 if ((specbits & (1 << (int) RID_COMPLEX))
4142 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4144 error ("complex invalid for `%s'", name);
4145 specbits &= ~(1 << (int) RID_COMPLEX);
4148 /* Decide whether an integer type is signed or not.
4149 Optionally treat bitfields as signed by default. */
4150 if (specbits & 1 << (int) RID_UNSIGNED
4151 /* Traditionally, all bitfields are unsigned. */
4152 || (bitfield && flag_traditional
4153 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4154 || (bitfield && ! flag_signed_bitfields
4155 && (explicit_int || defaulted_int || explicit_char
4156 /* A typedef for plain `int' without `signed'
4157 can be controlled just like plain `int'. */
4158 || ! (typedef_decl != 0
4159 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4160 && TREE_CODE (type) != ENUMERAL_TYPE
4161 && !(specbits & 1 << (int) RID_SIGNED)))
4164 type = long_long_unsigned_type_node;
4165 else if (specbits & 1 << (int) RID_LONG)
4166 type = long_unsigned_type_node;
4167 else if (specbits & 1 << (int) RID_SHORT)
4168 type = short_unsigned_type_node;
4169 else if (type == char_type_node)
4170 type = unsigned_char_type_node;
4171 else if (typedef_decl)
4172 type = unsigned_type (type);
4174 type = unsigned_type_node;
4176 else if ((specbits & 1 << (int) RID_SIGNED)
4177 && type == char_type_node)
4178 type = signed_char_type_node;
4180 type = long_long_integer_type_node;
4181 else if (specbits & 1 << (int) RID_LONG)
4182 type = long_integer_type_node;
4183 else if (specbits & 1 << (int) RID_SHORT)
4184 type = short_integer_type_node;
4186 if (specbits & 1 << (int) RID_COMPLEX)
4188 if (pedantic && !flag_isoc99)
4189 pedwarn ("ISO C89 does not support complex types");
4190 /* If we just have "complex", it is equivalent to
4191 "complex double", but if any modifiers at all are specified it is
4192 the complex form of TYPE. E.g, "complex short" is
4193 "complex short int". */
4195 if (defaulted_int && ! longlong
4196 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4197 | (1 << (int) RID_SIGNED)
4198 | (1 << (int) RID_UNSIGNED))))
4201 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4202 type = complex_double_type_node;
4204 else if (type == integer_type_node)
4207 pedwarn ("ISO C does not support complex integer types");
4208 type = complex_integer_type_node;
4210 else if (type == float_type_node)
4211 type = complex_float_type_node;
4212 else if (type == double_type_node)
4213 type = complex_double_type_node;
4214 else if (type == long_double_type_node)
4215 type = complex_long_double_type_node;
4219 pedwarn ("ISO C does not support complex integer types");
4220 type = build_complex_type (type);
4224 /* Figure out the type qualifiers for the declaration. There are
4225 two ways a declaration can become qualified. One is something
4226 like `const int i' where the `const' is explicit. Another is
4227 something like `typedef const int CI; CI i' where the type of the
4228 declaration contains the `const'. */
4229 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4230 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4231 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4232 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4233 if (constp > 1 && ! flag_isoc99)
4234 pedwarn ("duplicate `const'");
4235 if (restrictp > 1 && ! flag_isoc99)
4236 pedwarn ("duplicate `restrict'");
4237 if (volatilep > 1 && ! flag_isoc99)
4238 pedwarn ("duplicate `volatile'");
4239 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4240 type = TYPE_MAIN_VARIANT (type);
4241 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4242 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4243 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4245 /* Warn if two storage classes are given. Default to `auto'. */
4250 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4251 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4252 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4253 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4254 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4256 /* Warn about storage classes that are invalid for certain
4257 kinds of declarations (parameters, typenames, etc.). */
4260 error ("multiple storage classes in declaration of `%s'", name);
4261 else if (funcdef_flag
4263 & ((1 << (int) RID_REGISTER)
4264 | (1 << (int) RID_AUTO)
4265 | (1 << (int) RID_TYPEDEF))))
4267 if (specbits & 1 << (int) RID_AUTO
4268 && (pedantic || current_binding_level == global_binding_level))
4269 pedwarn ("function definition declared `auto'");
4270 if (specbits & 1 << (int) RID_REGISTER)
4271 error ("function definition declared `register'");
4272 if (specbits & 1 << (int) RID_TYPEDEF)
4273 error ("function definition declared `typedef'");
4274 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4275 | (1 << (int) RID_AUTO));
4277 else if (decl_context != NORMAL && nclasses > 0)
4279 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4283 switch (decl_context)
4286 error ("storage class specified for structure field `%s'",
4290 error ("storage class specified for parameter `%s'", name);
4293 error ("storage class specified for typename");
4296 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4297 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4298 | (1 << (int) RID_EXTERN));
4301 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4303 /* `extern' with initialization is invalid if not at top level. */
4304 if (current_binding_level == global_binding_level)
4305 warning ("`%s' initialized and declared `extern'", name);
4307 error ("`%s' has both `extern' and initializer", name);
4309 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4310 && current_binding_level != global_binding_level)
4311 error ("nested function `%s' declared `extern'", name);
4312 else if (current_binding_level == global_binding_level
4313 && specbits & (1 << (int) RID_AUTO))
4314 error ("top-level declaration of `%s' specifies `auto'", name);
4317 /* Now figure out the structure of the declarator proper.
4318 Descend through it, creating more complex types, until we reach
4319 the declared identifier (or NULL_TREE, in an absolute declarator). */
4321 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4323 if (type == error_mark_node)
4325 declarator = TREE_OPERAND (declarator, 0);
4329 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4330 an INDIRECT_REF (for *...),
4331 a CALL_EXPR (for ...(...)),
4332 a TREE_LIST (for nested attributes),
4333 an identifier (for the name being declared)
4334 or a null pointer (for the place in an absolute declarator
4335 where the name was omitted).
4336 For the last two cases, we have just exited the loop.
4338 At this point, TYPE is the type of elements of an array,
4339 or for a function to return, or for a pointer to point to.
4340 After this sequence of ifs, TYPE is the type of the
4341 array or function or pointer, and DECLARATOR has had its
4342 outermost layer removed. */
4344 if (array_ptr_quals != NULL_TREE || array_parm_static)
4346 /* Only the innermost declarator (making a parameter be of
4347 array type which is converted to pointer type)
4348 may have static or type qualifiers. */
4349 error ("static or type qualifiers in non-parameter array declarator");
4350 array_ptr_quals = NULL_TREE;
4351 array_parm_static = 0;
4354 if (TREE_CODE (declarator) == TREE_LIST)
4356 /* We encode a declarator with embedded attributes using
4358 tree attrs = TREE_PURPOSE (declarator);
4361 declarator = TREE_VALUE (declarator);
4362 inner_decl = declarator;
4363 while (inner_decl != NULL_TREE
4364 && TREE_CODE (inner_decl) == TREE_LIST)
4365 inner_decl = TREE_VALUE (inner_decl);
4366 if (inner_decl == NULL_TREE
4367 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4368 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4369 if (TREE_CODE (inner_decl) == CALL_EXPR)
4370 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4371 if (TREE_CODE (inner_decl) == ARRAY_REF)
4372 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4373 returned_attrs = decl_attributes (&type,
4374 chainon (returned_attrs, attrs),
4377 else if (TREE_CODE (declarator) == ARRAY_REF)
4379 tree itype = NULL_TREE;
4380 tree size = TREE_OPERAND (declarator, 1);
4381 /* The index is a signed object `sizetype' bits wide. */
4382 tree index_type = signed_type (sizetype);
4384 array_ptr_quals = TREE_TYPE (declarator);
4385 array_parm_static = TREE_STATIC (declarator);
4387 declarator = TREE_OPERAND (declarator, 0);
4389 /* Check for some types that there cannot be arrays of. */
4391 if (VOID_TYPE_P (type))
4393 error ("declaration of `%s' as array of voids", name);
4394 type = error_mark_node;
4397 if (TREE_CODE (type) == FUNCTION_TYPE)
4399 error ("declaration of `%s' as array of functions", name);
4400 type = error_mark_node;
4403 if (size == error_mark_node)
4404 type = error_mark_node;
4406 if (type == error_mark_node)
4409 /* If size was specified, set ITYPE to a range-type for that size.
4410 Otherwise, ITYPE remains null. finish_decl may figure it out
4411 from an initial value. */
4415 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4416 STRIP_TYPE_NOPS (size);
4418 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4420 error ("size of array `%s' has non-integer type", name);
4421 size = integer_one_node;
4424 if (pedantic && integer_zerop (size))
4425 pedwarn ("ISO C forbids zero-size array `%s'", name);
4427 if (TREE_CODE (size) == INTEGER_CST)
4429 constant_expression_warning (size);
4430 if (tree_int_cst_sgn (size) < 0)
4432 error ("size of array `%s' is negative", name);
4433 size = integer_one_node;
4438 /* Make sure the array size remains visibly nonconstant
4439 even if it is (eg) a const variable with known value. */
4444 if (TREE_CONSTANT (size))
4445 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4448 pedwarn ("ISO C89 forbids variable-size array `%s'",
4453 if (integer_zerop (size))
4455 /* A zero-length array cannot be represented with an
4456 unsigned index type, which is what we'll get with
4457 build_index_type. Create an open-ended range instead. */
4458 itype = build_range_type (sizetype, size, NULL_TREE);
4462 /* Compute the maximum valid index, that is, size - 1.
4463 Do the calculation in index_type, so that if it is
4464 a variable the computations will be done in the
4466 itype = fold (build (MINUS_EXPR, index_type,
4467 convert (index_type, size),
4468 convert (index_type, size_one_node)));
4470 /* If that overflowed, the array is too big.
4471 ??? While a size of INT_MAX+1 technically shouldn't
4472 cause an overflow (because we subtract 1), the overflow
4473 is recorded during the conversion to index_type, before
4474 the subtraction. Handling this case seems like an
4475 unnecessary complication. */
4476 if (TREE_OVERFLOW (itype))
4478 error ("size of array `%s' is too large", name);
4479 type = error_mark_node;
4484 itype = variable_size (itype);
4485 itype = build_index_type (itype);
4488 else if (decl_context == FIELD)
4490 /* ??? Need to check somewhere that this is a structure
4491 and not a union, that this field is last, and that
4492 this structure has at least one other named member. */
4494 if (pedantic && !flag_isoc99 && !in_system_header)
4495 pedwarn ("ISO C89 does not support flexible array members");
4497 /* ISO C99 Flexible array members are effectively identical
4498 to GCC's zero-length array extension. */
4499 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4502 /* If pedantic, complain about arrays of incomplete types. */
4504 if (pedantic && !COMPLETE_TYPE_P (type))
4505 pedwarn ("array type has incomplete element type");
4508 /* We shouldn't have a function type here at all!
4509 Functions aren't allowed as array elements. */
4510 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4511 && (constp || volatilep))
4512 pedwarn ("ANSI C forbids const or volatile function types");
4515 /* Build the array type itself, then merge any constancy or
4516 volatility into the target type. We must do it in this order
4517 to ensure that the TYPE_MAIN_VARIANT field of the array type
4518 is set correctly. */
4520 type = build_array_type (type, itype);
4522 type = c_build_qualified_type (type, type_quals);
4525 C_TYPE_VARIABLE_SIZE (type) = 1;
4527 /* The GCC extension for zero-length arrays differs from
4528 ISO flexible array members in that sizeof yields zero. */
4529 if (size && integer_zerop (size))
4532 TYPE_SIZE (type) = bitsize_zero_node;
4533 TYPE_SIZE_UNIT (type) = size_zero_node;
4535 if (decl_context != PARM
4536 && (array_ptr_quals != NULL_TREE || array_parm_static))
4538 error ("static or type qualifiers in non-parameter array declarator");
4539 array_ptr_quals = NULL_TREE;
4540 array_parm_static = 0;
4543 else if (TREE_CODE (declarator) == CALL_EXPR)
4547 /* Declaring a function type.
4548 Make sure we have a valid type for the function to return. */
4549 if (type == error_mark_node)
4554 /* Warn about some types functions can't return. */
4556 if (TREE_CODE (type) == FUNCTION_TYPE)
4558 error ("`%s' declared as function returning a function", name);
4559 type = integer_type_node;
4561 if (TREE_CODE (type) == ARRAY_TYPE)
4563 error ("`%s' declared as function returning an array", name);
4564 type = integer_type_node;
4567 #ifndef TRADITIONAL_RETURN_FLOAT
4568 /* Traditionally, declaring return type float means double. */
4570 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4571 type = double_type_node;
4572 #endif /* TRADITIONAL_RETURN_FLOAT */
4574 /* Construct the function type and go to the next
4575 inner layer of declarator. */
4577 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4579 /* Say it's a definition
4580 only for the CALL_EXPR
4581 closest to the identifier. */
4582 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4583 /* Type qualifiers before the return type of the function
4584 qualify the return type, not the function type. */
4587 /* Type qualifiers on a function return type are normally
4588 permitted by the standard but have no effect, so give a
4589 warning at -W. Qualifiers on a void return type have
4590 meaning as a GNU extension, and are banned on function
4591 definitions in ISO C. FIXME: strictly we shouldn't
4592 pedwarn for qualified void return types except on function
4593 definitions, but not doing so could lead to the undesirable
4594 state of a "volatile void" function return type not being
4595 warned about, and a use of the function being compiled
4596 with GNU semantics, with no diagnostics under -pedantic. */
4597 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4598 pedwarn ("ISO C forbids qualified void function return type");
4599 else if (extra_warnings
4600 && !(VOID_TYPE_P (type)
4601 && type_quals == TYPE_QUAL_VOLATILE))
4602 warning ("type qualifiers ignored on function return type");
4604 type = c_build_qualified_type (type, type_quals);
4606 type_quals = TYPE_UNQUALIFIED;
4608 type = build_function_type (type, arg_types);
4609 declarator = TREE_OPERAND (declarator, 0);
4611 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4612 the formal parameter list of this FUNCTION_TYPE to point to
4613 the FUNCTION_TYPE node itself. */
4618 for (link = last_function_parm_tags;
4620 link = TREE_CHAIN (link))
4621 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4624 else if (TREE_CODE (declarator) == INDIRECT_REF)
4626 /* Merge any constancy or volatility into the target type
4629 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4631 pedwarn ("ISO C forbids qualified function types");
4633 type = c_build_qualified_type (type, type_quals);
4634 type_quals = TYPE_UNQUALIFIED;
4637 type = build_pointer_type (type);
4639 /* Process a list of type modifier keywords
4640 (such as const or volatile) that were given inside the `*'. */
4642 if (TREE_TYPE (declarator))
4650 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4651 typemodlist = TREE_CHAIN (typemodlist))
4653 tree qualifier = TREE_VALUE (typemodlist);
4655 if (C_IS_RESERVED_WORD (qualifier))
4657 if (C_RID_CODE (qualifier) == RID_CONST)
4659 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4661 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4671 error ("invalid type modifier within pointer declarator");
4672 if (constp > 1 && ! flag_isoc99)
4673 pedwarn ("duplicate `const'");
4674 if (volatilep > 1 && ! flag_isoc99)
4675 pedwarn ("duplicate `volatile'");
4676 if (restrictp > 1 && ! flag_isoc99)
4677 pedwarn ("duplicate `restrict'");
4679 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4680 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4681 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4684 declarator = TREE_OPERAND (declarator, 0);
4691 /* Now TYPE has the actual type. */
4693 /* Did array size calculations overflow? */
4695 if (TREE_CODE (type) == ARRAY_TYPE
4696 && COMPLETE_TYPE_P (type)
4697 && TREE_OVERFLOW (TYPE_SIZE (type)))
4699 error ("size of array `%s' is too large", name);
4700 /* If we proceed with the array type as it is, we'll eventully
4701 crash in tree_low_cst(). */
4702 type = error_mark_node;
4705 /* If this is declaring a typedef name, return a TYPE_DECL. */
4707 if (specbits & (1 << (int) RID_TYPEDEF))
4710 /* Note that the grammar rejects storage classes
4711 in typenames, fields or parameters */
4712 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4714 pedwarn ("ISO C forbids qualified function types");
4716 type = c_build_qualified_type (type, type_quals);
4717 decl = build_decl (TYPE_DECL, declarator, type);
4718 if ((specbits & (1 << (int) RID_SIGNED))
4719 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4720 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4721 decl_attributes (&decl, returned_attrs, 0);
4725 /* Detect the case of an array type of unspecified size
4726 which came, as such, direct from a typedef name.
4727 We must copy the type, so that each identifier gets
4728 a distinct type, so that each identifier's size can be
4729 controlled separately by its own initializer. */
4731 if (type != 0 && typedef_type != 0
4732 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4733 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4735 type = build_array_type (TREE_TYPE (type), 0);
4737 C_TYPE_VARIABLE_SIZE (type) = 1;
4740 /* If this is a type name (such as, in a cast or sizeof),
4741 compute the type and return it now. */
4743 if (decl_context == TYPENAME)
4745 /* Note that the grammar rejects storage classes
4746 in typenames, fields or parameters */
4747 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4749 pedwarn ("ISO C forbids const or volatile function types");
4751 type = c_build_qualified_type (type, type_quals);
4752 decl_attributes (&type, returned_attrs, 0);
4756 /* Aside from typedefs and type names (handle above),
4757 `void' at top level (not within pointer)
4758 is allowed only in public variables.
4759 We don't complain about parms either, but that is because
4760 a better error message can be made later. */
4762 if (VOID_TYPE_P (type) && decl_context != PARM
4763 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4764 && ((specbits & (1 << (int) RID_EXTERN))
4765 || (current_binding_level == global_binding_level
4767 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4769 error ("variable or field `%s' declared void", name);
4770 type = integer_type_node;
4773 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4774 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4779 if (decl_context == PARM)
4781 tree type_as_written;
4784 /* A parameter declared as an array of T is really a pointer to T.
4785 One declared as a function is really a pointer to a function. */
4787 if (TREE_CODE (type) == ARRAY_TYPE)
4789 /* Transfer const-ness of array into that of type pointed to. */
4790 type = TREE_TYPE (type);
4792 type = c_build_qualified_type (type, type_quals);
4793 type = build_pointer_type (type);
4794 type_quals = TYPE_UNQUALIFIED;
4795 if (array_ptr_quals)
4797 tree new_ptr_quals, new_ptr_attrs;
4799 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4800 /* We don't yet implement attributes in this context. */
4801 if (new_ptr_attrs != NULL_TREE)
4802 warning ("attributes in parameter array declarator ignored");
4807 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4809 tree qualifier = TREE_VALUE (new_ptr_quals);
4811 if (C_IS_RESERVED_WORD (qualifier))
4813 if (C_RID_CODE (qualifier) == RID_CONST)
4815 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4817 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4827 error ("invalid type modifier within array declarator");
4829 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4830 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4831 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4835 else if (TREE_CODE (type) == FUNCTION_TYPE)
4837 if (pedantic && type_quals)
4838 pedwarn ("ISO C forbids qualified function types");
4840 type = c_build_qualified_type (type, type_quals);
4841 type = build_pointer_type (type);
4842 type_quals = TYPE_UNQUALIFIED;
4844 else if (type_quals)
4845 type = c_build_qualified_type (type, type_quals);
4847 type_as_written = type;
4849 decl = build_decl (PARM_DECL, declarator, type);
4851 C_DECL_VARIABLE_SIZE (decl) = 1;
4853 /* Compute the type actually passed in the parmlist,
4854 for the case where there is no prototype.
4855 (For example, shorts and chars are passed as ints.)
4856 When there is a prototype, this is overridden later. */
4858 if (type == error_mark_node)
4859 promoted_type = type;
4862 promoted_type = simple_type_promotes_to (type);
4863 if (! promoted_type)
4864 promoted_type = type;
4867 DECL_ARG_TYPE (decl) = promoted_type;
4868 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4870 else if (decl_context == FIELD)
4872 /* Structure field. It may not be a function. */
4874 if (TREE_CODE (type) == FUNCTION_TYPE)
4876 error ("field `%s' declared as a function", name);
4877 type = build_pointer_type (type);
4879 else if (TREE_CODE (type) != ERROR_MARK
4880 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4882 error ("field `%s' has incomplete type", name);
4883 type = error_mark_node;
4885 /* Move type qualifiers down to element of an array. */
4886 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4888 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4890 TYPE_DOMAIN (type));
4892 /* Leave the field const or volatile as well. */
4893 type_quals = TYPE_UNQUALIFIED;
4896 decl = build_decl (FIELD_DECL, declarator, type);
4897 DECL_NONADDRESSABLE_P (decl) = bitfield;
4900 C_DECL_VARIABLE_SIZE (decl) = 1;
4902 else if (TREE_CODE (type) == FUNCTION_TYPE)
4904 /* Every function declaration is "external"
4905 except for those which are inside a function body
4906 in which `auto' is used.
4907 That is a case not specified by ANSI C,
4908 and we use it for forward declarations for nested functions. */
4909 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4910 || current_binding_level == global_binding_level);
4912 if (specbits & (1 << (int) RID_AUTO)
4913 && (pedantic || current_binding_level == global_binding_level))
4914 pedwarn ("invalid storage class for function `%s'", name);
4915 if (specbits & (1 << (int) RID_REGISTER))
4916 error ("invalid storage class for function `%s'", name);
4917 /* Function declaration not at top level.
4918 Storage classes other than `extern' are not allowed
4919 and `extern' makes no difference. */
4920 if (current_binding_level != global_binding_level
4921 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4923 pedwarn ("invalid storage class for function `%s'", name);
4925 decl = build_decl (FUNCTION_DECL, declarator, type);
4926 decl = build_decl_attribute_variant (decl, decl_attr);
4928 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4929 ggc_alloc_cleared (sizeof (struct lang_decl));
4931 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4932 pedwarn ("ISO C forbids qualified function types");
4934 /* GNU C interprets a `volatile void' return type to indicate
4935 that the function does not return. */
4936 if ((type_quals & TYPE_QUAL_VOLATILE)
4937 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4938 warning ("`noreturn' function returns non-void value");
4941 DECL_EXTERNAL (decl) = 1;
4942 /* Record absence of global scope for `static' or `auto'. */
4944 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4946 /* Record presence of `inline', if it is reasonable. */
4947 if (MAIN_NAME_P (declarator))
4950 warning ("cannot inline function `main'");
4954 /* Assume that otherwise the function can be inlined. */
4955 DECL_INLINE (decl) = 1;
4956 DECL_DECLARED_INLINE_P (decl) = 1;
4958 if (specbits & (1 << (int) RID_EXTERN))
4959 current_extern_inline = 1;
4961 /* If -finline-functions, assume it can be inlined. This does
4962 two things: let the function be deferred until it is actually
4963 needed, and let dwarf2 know that the function is inlinable. */
4964 else if (flag_inline_trees == 2)
4966 DECL_INLINE (decl) = 1;
4967 DECL_DECLARED_INLINE_P (decl) = 0;
4972 /* It's a variable. */
4973 /* An uninitialized decl with `extern' is a reference. */
4974 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4976 /* Move type qualifiers down to element of an array. */
4977 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4979 int saved_align = TYPE_ALIGN(type);
4980 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4982 TYPE_DOMAIN (type));
4983 TYPE_ALIGN (type) = saved_align;
4984 #if 0 /* Leave the variable const or volatile as well. */
4985 type_quals = TYPE_UNQUALIFIED;
4988 else if (type_quals)
4989 type = c_build_qualified_type (type, type_quals);
4991 decl = build_decl (VAR_DECL, declarator, type);
4993 C_DECL_VARIABLE_SIZE (decl) = 1;
4996 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4998 DECL_EXTERNAL (decl) = extern_ref;
4999 /* At top level, the presence of a `static' or `register' storage
5000 class specifier, or the absence of all storage class specifiers
5001 makes this declaration a definition (perhaps tentative). Also,
5002 the absence of both `static' and `register' makes it public. */
5003 if (current_binding_level == global_binding_level)
5007 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5008 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5010 /* Not at top level, only `static' makes a static definition. */
5013 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5014 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5018 /* Record `register' declaration for warnings on &
5019 and in case doing stupid register allocation. */
5021 if (specbits & (1 << (int) RID_REGISTER))
5022 DECL_REGISTER (decl) = 1;
5024 /* Record constancy and volatility. */
5025 c_apply_type_quals_to_decl (type_quals, decl);
5027 /* If a type has volatile components, it should be stored in memory.
5028 Otherwise, the fact that those components are volatile
5029 will be ignored, and would even crash the compiler. */
5030 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5031 mark_addressable (decl);
5033 decl_attributes (&decl, returned_attrs, 0);
5039 /* Decode the parameter-list info for a function type or function definition.
5040 The argument is the value returned by `get_parm_info' (or made in parse.y
5041 if there is an identifier list instead of a parameter decl list).
5042 These two functions are separate because when a function returns
5043 or receives functions then each is called multiple times but the order
5044 of calls is different. The last call to `grokparms' is always the one
5045 that contains the formal parameter names of a function definition.
5047 Store in `last_function_parms' a chain of the decls of parms.
5048 Also store in `last_function_parm_tags' a chain of the struct, union,
5049 and enum tags declared among the parms.
5051 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5053 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5054 a mere declaration. A nonempty identifier-list gets an error message
5055 when FUNCDEF_FLAG is zero. */
5058 grokparms (parms_info, funcdef_flag)
5062 tree first_parm = TREE_CHAIN (parms_info);
5064 last_function_parms = TREE_PURPOSE (parms_info);
5065 last_function_parm_tags = TREE_VALUE (parms_info);
5067 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5068 && !in_system_header)
5069 warning ("function declaration isn't a prototype");
5072 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5075 pedwarn ("parameter names (without types) in function declaration");
5077 last_function_parms = first_parm;
5084 /* We no longer test FUNCDEF_FLAG.
5085 If the arg types are incomplete in a declaration,
5086 they must include undefined tags.
5087 These tags can never be defined in the scope of the declaration,
5088 so the types can never be completed,
5089 and no call can be compiled successfully. */
5091 /* In a fcn definition, arg types must be complete. */
5094 for (parm = last_function_parms, typelt = first_parm;
5096 parm = TREE_CHAIN (parm))
5097 /* Skip over any enumeration constants declared here. */
5098 if (TREE_CODE (parm) == PARM_DECL)
5100 /* Barf if the parameter itself has an incomplete type. */
5101 tree type = TREE_VALUE (typelt);
5102 if (type == error_mark_node)
5104 if (!COMPLETE_TYPE_P (type))
5106 if (funcdef_flag && DECL_NAME (parm) != 0)
5107 error ("parameter `%s' has incomplete type",
5108 IDENTIFIER_POINTER (DECL_NAME (parm)));
5110 warning ("parameter has incomplete type");
5113 TREE_VALUE (typelt) = error_mark_node;
5114 TREE_TYPE (parm) = error_mark_node;
5118 /* This has been replaced by parm_tags_warning, which
5119 uses a more accurate criterion for what to warn
5123 /* Now warn if is a pointer to an incomplete type. */
5124 while (TREE_CODE (type) == POINTER_TYPE
5125 || TREE_CODE (type) == REFERENCE_TYPE)
5126 type = TREE_TYPE (type);
5127 type = TYPE_MAIN_VARIANT (type);
5128 if (!COMPLETE_TYPE_P (type))
5130 if (DECL_NAME (parm) != 0)
5131 warning ("parameter `%s' points to incomplete type",
5132 IDENTIFIER_POINTER (DECL_NAME (parm)));
5134 warning ("parameter points to incomplete type");
5138 typelt = TREE_CHAIN (typelt);
5145 /* Return a tree_list node with info on a parameter list just parsed.
5146 The TREE_PURPOSE is a chain of decls of those parms.
5147 The TREE_VALUE is a list of structure, union and enum tags defined.
5148 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5149 This tree_list node is later fed to `grokparms'.
5151 VOID_AT_END nonzero means append `void' to the end of the type-list.
5152 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5155 get_parm_info (void_at_end)
5161 tree tags = gettags ();
5162 tree parms = getdecls ();
5164 tree order = current_binding_level->parm_order;
5166 /* Just `void' (and no ellipsis) is special. There are really no parms.
5167 But if the `void' is qualified (by `const' or `volatile') or has a
5168 storage class specifier (`register'), then the behavior is undefined;
5169 by not counting it as the special case of `void' we will cause an
5170 error later. Typedefs for `void' are OK (see DR#157). */
5171 if (void_at_end && parms != 0
5172 && TREE_CHAIN (parms) == 0
5173 && VOID_TYPE_P (TREE_TYPE (parms))
5174 && ! TREE_THIS_VOLATILE (parms)
5175 && ! TREE_READONLY (parms)
5176 && ! DECL_REGISTER (parms)
5177 && DECL_NAME (parms) == 0)
5180 storedecls (NULL_TREE);
5181 return tree_cons (NULL_TREE, NULL_TREE,
5182 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5185 /* Extract enumerator values and other non-parms declared with the parms.
5186 Likewise any forward parm decls that didn't have real parm decls. */
5187 for (decl = parms; decl;)
5189 tree next = TREE_CHAIN (decl);
5191 if (TREE_CODE (decl) != PARM_DECL)
5193 TREE_CHAIN (decl) = new_parms;
5196 else if (TREE_ASM_WRITTEN (decl))
5198 error_with_decl (decl,
5199 "parameter `%s' has just a forward declaration");
5200 TREE_CHAIN (decl) = new_parms;
5206 /* Put the parm decls back in the order they were in in the parm list. */
5207 for (t = order; t; t = TREE_CHAIN (t))
5210 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5212 TREE_CHAIN (TREE_VALUE (t)) = 0;
5215 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5218 /* Store the parmlist in the binding level since the old one
5219 is no longer a valid list. (We have changed the chain pointers.) */
5220 storedecls (new_parms);
5222 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5223 /* There may also be declarations for enumerators if an enumeration
5224 type is declared among the parms. Ignore them here. */
5225 if (TREE_CODE (decl) == PARM_DECL)
5227 /* Since there is a prototype,
5228 args are passed in their declared types. */
5229 tree type = TREE_TYPE (decl);
5230 DECL_ARG_TYPE (decl) = type;
5231 if (PROMOTE_PROTOTYPES
5232 && INTEGRAL_TYPE_P (type)
5233 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5234 DECL_ARG_TYPE (decl) = integer_type_node;
5236 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5237 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5238 && DECL_NAME (decl) == 0)
5240 error ("`void' in parameter list must be the entire list");
5246 return tree_cons (new_parms, tags,
5247 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5249 return tree_cons (new_parms, tags, nreverse (types));
5252 /* At end of parameter list, warn about any struct, union or enum tags
5253 defined within. Do so because these types cannot ever become complete. */
5256 parmlist_tags_warning ()
5261 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5263 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5264 /* An anonymous union parm type is meaningful as a GNU extension.
5265 So don't warn for that. */
5266 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5268 if (TREE_PURPOSE (elt) != 0)
5269 warning ("`%s %s' declared inside parameter list",
5270 (code == RECORD_TYPE ? "struct"
5271 : code == UNION_TYPE ? "union"
5273 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5276 /* For translation these need to be separate warnings */
5277 if (code == RECORD_TYPE)
5278 warning ("anonymous struct declared inside parameter list");
5279 else if (code == UNION_TYPE)
5280 warning ("anonymous union declared inside parameter list");
5282 warning ("anonymous enum declared inside parameter list");
5286 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5292 /* Get the struct, enum or union (CODE says which) with tag NAME.
5293 Define the tag as a forward-reference if it is not defined. */
5296 xref_tag (code, name)
5297 enum tree_code code;
5300 /* If a cross reference is requested, look up the type
5301 already defined for this tag and return it. */
5303 tree ref = lookup_tag (code, name, current_binding_level, 0);
5304 /* If this is the right type of tag, return what we found.
5305 (This reference will be shadowed by shadow_tag later if appropriate.)
5306 If this is the wrong type of tag, do not return it. If it was the
5307 wrong type in the same binding level, we will have had an error
5308 message already; if in a different binding level and declaring
5309 a name, pending_xref_error will give an error message; but if in a
5310 different binding level and not declaring a name, this tag should
5311 shadow the previous declaration of a different type of tag, and
5312 this would not work properly if we return the reference found.
5313 (For example, with "struct foo" in an outer scope, "union foo;"
5314 must shadow that tag with a new one of union type.) */
5315 if (ref && TREE_CODE (ref) == code)
5318 /* If no such tag is yet defined, create a forward-reference node
5319 and record it as the "definition".
5320 When a real declaration of this type is found,
5321 the forward-reference will be altered into a real type. */
5323 ref = make_node (code);
5324 if (code == ENUMERAL_TYPE)
5326 /* Give the type a default layout like unsigned int
5327 to avoid crashing if it does not get defined. */
5328 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5329 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5330 TYPE_USER_ALIGN (ref) = 0;
5331 TREE_UNSIGNED (ref) = 1;
5332 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5333 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5334 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5337 pushtag (name, ref);
5342 /* Make sure that the tag NAME is defined *in the current binding level*
5343 at least as a forward reference.
5344 CODE says which kind of tag NAME ought to be. */
5347 start_struct (code, name)
5348 enum tree_code code;
5351 /* If there is already a tag defined at this binding level
5352 (as a forward reference), just return it. */
5357 ref = lookup_tag (code, name, current_binding_level, 1);
5358 if (ref && TREE_CODE (ref) == code)
5360 C_TYPE_BEING_DEFINED (ref) = 1;
5361 TYPE_PACKED (ref) = flag_pack_struct;
5362 if (TYPE_FIELDS (ref))
5363 error ("redefinition of `%s %s'",
5364 code == UNION_TYPE ? "union" : "struct",
5365 IDENTIFIER_POINTER (name));
5370 /* Otherwise create a forward-reference just so the tag is in scope. */
5372 ref = make_node (code);
5373 pushtag (name, ref);
5374 C_TYPE_BEING_DEFINED (ref) = 1;
5375 TYPE_PACKED (ref) = flag_pack_struct;
5379 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5380 of a structure component, returning a FIELD_DECL node.
5381 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5383 This is done during the parsing of the struct declaration.
5384 The FIELD_DECL nodes are chained together and the lot of them
5385 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5388 grokfield (filename, line, declarator, declspecs, width)
5389 const char *filename ATTRIBUTE_UNUSED;
5390 int line ATTRIBUTE_UNUSED;
5391 tree declarator, declspecs, width;
5395 if (declarator == NULL_TREE && width == NULL_TREE)
5397 /* This is an unnamed decl. We only support unnamed
5398 structs/unions, so check for other things and refuse them. */
5399 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5400 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5402 error ("unnamed fields of type other than struct or union are not allowed");
5407 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5409 finish_decl (value, NULL_TREE, NULL_TREE);
5410 DECL_INITIAL (value) = width;
5412 maybe_objc_check_decl (value);
5416 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5417 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5418 ATTRIBUTES are attributes to be applied to the structure. */
5421 finish_struct (t, fieldlist, attributes)
5427 int toplevel = global_binding_level == current_binding_level;
5428 int saw_named_field;
5430 /* If this type was previously laid out as a forward reference,
5431 make sure we lay it out again. */
5435 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5437 /* Nameless union parm types are useful as GCC extension. */
5438 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5439 /* Otherwise, warn about any struct or union def. in parmlist. */
5440 if (in_parm_level_p ())
5443 pedwarn ("%s defined inside parms",
5444 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5445 else if (! flag_traditional)
5446 warning ("%s defined inside parms",
5447 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5452 for (x = fieldlist; x; x = TREE_CHAIN (x))
5453 if (DECL_NAME (x) != 0)
5457 pedwarn ("%s has no %s",
5458 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5459 fieldlist ? _("named members") : _("members"));
5462 /* Install struct as DECL_CONTEXT of each field decl.
5463 Also process specified field sizes,m which is found in the DECL_INITIAL.
5464 Store 0 there, except for ": 0" fields (so we can find them
5465 and delete them, below). */
5467 saw_named_field = 0;
5468 for (x = fieldlist; x; x = TREE_CHAIN (x))
5470 DECL_CONTEXT (x) = t;
5471 DECL_PACKED (x) |= TYPE_PACKED (t);
5473 /* If any field is const, the structure type is pseudo-const. */
5474 if (TREE_READONLY (x))
5475 C_TYPE_FIELDS_READONLY (t) = 1;
5478 /* A field that is pseudo-const makes the structure likewise. */
5479 tree t1 = TREE_TYPE (x);
5480 while (TREE_CODE (t1) == ARRAY_TYPE)
5481 t1 = TREE_TYPE (t1);
5482 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5483 && C_TYPE_FIELDS_READONLY (t1))
5484 C_TYPE_FIELDS_READONLY (t) = 1;
5487 /* Any field that is volatile means variables of this type must be
5488 treated in some ways as volatile. */
5489 if (TREE_THIS_VOLATILE (x))
5490 C_TYPE_FIELDS_VOLATILE (t) = 1;
5492 /* Any field of nominal variable size implies structure is too. */
5493 if (C_DECL_VARIABLE_SIZE (x))
5494 C_TYPE_VARIABLE_SIZE (t) = 1;
5496 /* Detect invalid nested redefinition. */
5497 if (TREE_TYPE (x) == t)
5498 error ("nested redefinition of `%s'",
5499 IDENTIFIER_POINTER (TYPE_NAME (t)));
5501 /* Detect invalid bit-field size. */
5502 if (DECL_INITIAL (x))
5503 STRIP_NOPS (DECL_INITIAL (x));
5504 if (DECL_INITIAL (x))
5506 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5507 constant_expression_warning (DECL_INITIAL (x));
5511 "bit-field `%s' width not an integer constant");
5512 DECL_INITIAL (x) = NULL;
5516 /* Detect invalid bit-field type. */
5517 if (DECL_INITIAL (x)
5518 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5519 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5520 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5522 error_with_decl (x, "bit-field `%s' has invalid type");
5523 DECL_INITIAL (x) = NULL;
5526 if (DECL_INITIAL (x) && pedantic
5527 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5528 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5529 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5530 /* Accept an enum that's equivalent to int or unsigned int. */
5531 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5532 && (TYPE_PRECISION (TREE_TYPE (x))
5533 == TYPE_PRECISION (integer_type_node))))
5534 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5536 /* Detect and ignore out of range field width and process valid
5538 if (DECL_INITIAL (x))
5541 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5542 max_width = CHAR_TYPE_SIZE;
5544 max_width = TYPE_PRECISION (TREE_TYPE (x));
5545 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5546 error_with_decl (x, "negative width in bit-field `%s'");
5547 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5548 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5549 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5550 error_with_decl (x, "zero width for bit-field `%s'");
5553 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5554 unsigned HOST_WIDE_INT width
5555 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5557 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5558 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5559 TREE_UNSIGNED (TREE_TYPE (x)))
5561 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5562 TREE_UNSIGNED (TREE_TYPE (x))))))
5563 warning_with_decl (x,
5564 "`%s' is narrower than values of its type");
5566 DECL_SIZE (x) = bitsize_int (width);
5567 DECL_BIT_FIELD (x) = 1;
5568 SET_DECL_C_BIT_FIELD (x);
5572 /* field size 0 => force desired amount of alignment. */
5573 #ifdef EMPTY_FIELD_BOUNDARY
5574 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5576 #ifdef PCC_BITFIELD_TYPE_MATTERS
5577 if (PCC_BITFIELD_TYPE_MATTERS)
5579 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5580 TYPE_ALIGN (TREE_TYPE (x)));
5581 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5588 else if (TREE_TYPE (x) != error_mark_node)
5590 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5591 : TYPE_ALIGN (TREE_TYPE (x)));
5593 /* Non-bit-fields are aligned for their type, except packed
5594 fields which require only BITS_PER_UNIT alignment. */
5595 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5596 if (! DECL_PACKED (x))
5597 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5600 DECL_INITIAL (x) = 0;
5602 /* Detect flexible array member in an invalid context. */
5603 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5604 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5605 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5606 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5608 if (TREE_CODE (t) == UNION_TYPE)
5609 error_with_decl (x, "flexible array member in union");
5610 else if (TREE_CHAIN (x) != NULL_TREE)
5611 error_with_decl (x, "flexible array member not at end of struct");
5612 else if (! saw_named_field)
5613 error_with_decl (x, "flexible array member in otherwise empty struct");
5616 saw_named_field = 1;
5619 /* Delete all duplicate fields from the fieldlist */
5620 for (x = fieldlist; x && TREE_CHAIN (x);)
5621 /* Anonymous fields aren't duplicates. */
5622 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5630 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5636 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5638 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5639 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5645 /* Now we have the nearly final fieldlist. Record it,
5646 then lay out the structure or union (including the fields). */
5648 TYPE_FIELDS (t) = fieldlist;
5652 /* Delete all zero-width bit-fields from the fieldlist */
5654 tree *fieldlistp = &fieldlist;
5656 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5657 *fieldlistp = TREE_CHAIN (*fieldlistp);
5659 fieldlistp = &TREE_CHAIN (*fieldlistp);
5662 /* Now we have the truly final field list.
5663 Store it in this type and in the variants. */
5665 TYPE_FIELDS (t) = fieldlist;
5667 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5669 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5670 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5671 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5672 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5675 /* If this was supposed to be a transparent union, but we can't
5676 make it one, warn and turn off the flag. */
5677 if (TREE_CODE (t) == UNION_TYPE
5678 && TYPE_TRANSPARENT_UNION (t)
5679 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5681 TYPE_TRANSPARENT_UNION (t) = 0;
5682 warning ("union cannot be made transparent");
5685 /* If this structure or union completes the type of any previous
5686 variable declaration, lay it out and output its rtl. */
5688 if (current_binding_level->n_incomplete != 0)
5691 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5693 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5694 && TREE_CODE (decl) != TYPE_DECL)
5696 layout_decl (decl, 0);
5697 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5698 maybe_objc_check_decl (decl);
5699 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5702 --current_binding_level->n_incomplete;
5704 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5705 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5707 tree element = TREE_TYPE (decl);
5708 while (TREE_CODE (element) == ARRAY_TYPE)
5709 element = TREE_TYPE (element);
5711 layout_array_type (TREE_TYPE (decl));
5716 /* Finish debugging output for this type. */
5717 rest_of_type_compilation (t, toplevel);
5722 /* Lay out the type T, and its element type, and so on. */
5725 layout_array_type (t)
5728 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5729 layout_array_type (TREE_TYPE (t));
5733 /* Begin compiling the definition of an enumeration type.
5734 NAME is its name (or null if anonymous).
5735 Returns the type object, as yet incomplete.
5736 Also records info about it so that build_enumerator
5737 may be used to declare the individual values as they are read. */
5745 /* If this is the real definition for a previous forward reference,
5746 fill in the contents in the same object that used to be the
5747 forward reference. */
5750 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5752 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5754 enumtype = make_node (ENUMERAL_TYPE);
5755 pushtag (name, enumtype);
5758 C_TYPE_BEING_DEFINED (enumtype) = 1;
5760 if (TYPE_VALUES (enumtype) != 0)
5762 /* This enum is a named one that has been declared already. */
5763 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5765 /* Completely replace its old definition.
5766 The old enumerators remain defined, however. */
5767 TYPE_VALUES (enumtype) = 0;
5770 enum_next_value = integer_zero_node;
5773 if (flag_short_enums)
5774 TYPE_PACKED (enumtype) = 1;
5779 /* After processing and defining all the values of an enumeration type,
5780 install their decls in the enumeration type and finish it off.
5781 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5782 and ATTRIBUTES are the specified attributes.
5783 Returns ENUMTYPE. */
5786 finish_enum (enumtype, values, attributes)
5792 tree minnode = 0, maxnode = 0, enum_value_type;
5793 int precision, unsign;
5794 int toplevel = (global_binding_level == current_binding_level);
5796 if (in_parm_level_p ())
5797 warning ("enum defined inside parms");
5799 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5801 /* Calculate the maximum value of any enumerator in this type. */
5803 if (values == error_mark_node)
5804 minnode = maxnode = integer_zero_node;
5807 minnode = maxnode = TREE_VALUE (values);
5808 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5810 tree value = TREE_VALUE (pair);
5811 if (tree_int_cst_lt (maxnode, value))
5813 if (tree_int_cst_lt (value, minnode))
5818 /* Construct the final type of this enumeration. It is the same
5819 as one of the integral types - the narrowest one that fits, except
5820 that normally we only go as narrow as int - and signed iff any of
5821 the values are negative. */
5822 unsign = (tree_int_cst_sgn (minnode) >= 0);
5823 precision = MAX (min_precision (minnode, unsign),
5824 min_precision (maxnode, unsign));
5825 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5827 tree narrowest = type_for_size (precision, unsign);
5830 warning ("enumeration values exceed range of largest integer");
5831 narrowest = long_long_integer_type_node;
5834 precision = TYPE_PRECISION (narrowest);
5837 precision = TYPE_PRECISION (integer_type_node);
5839 if (precision == TYPE_PRECISION (integer_type_node))
5840 enum_value_type = type_for_size (precision, 0);
5842 enum_value_type = enumtype;
5844 TYPE_MIN_VALUE (enumtype) = minnode;
5845 TYPE_MAX_VALUE (enumtype) = maxnode;
5846 TYPE_PRECISION (enumtype) = precision;
5847 TREE_UNSIGNED (enumtype) = unsign;
5848 TYPE_SIZE (enumtype) = 0;
5849 layout_type (enumtype);
5851 if (values != error_mark_node)
5853 /* Change the type of the enumerators to be the enum type. We
5854 need to do this irrespective of the size of the enum, for
5855 proper type checking. Replace the DECL_INITIALs of the
5856 enumerators, and the value slots of the list, with copies
5857 that have the enum type; they cannot be modified in place
5858 because they may be shared (e.g. integer_zero_node) Finally,
5859 change the purpose slots to point to the names of the decls. */
5860 for (pair = values; pair; pair = TREE_CHAIN (pair))
5862 tree enu = TREE_PURPOSE (pair);
5864 TREE_TYPE (enu) = enumtype;
5865 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5866 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5867 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5868 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5869 DECL_MODE (enu) = TYPE_MODE (enumtype);
5871 /* The ISO C Standard mandates enumerators to have type int,
5872 even though the underlying type of an enum type is
5873 unspecified. Here we convert any enumerators that fit in
5874 an int to type int, to avoid promotions to unsigned types
5875 when comparing integers with enumerators that fit in the
5876 int range. When -pedantic is given, build_enumerator()
5877 would have already taken care of those that don't fit. */
5878 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5879 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5881 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5883 TREE_PURPOSE (pair) = DECL_NAME (enu);
5884 TREE_VALUE (pair) = DECL_INITIAL (enu);
5887 TYPE_VALUES (enumtype) = values;
5890 /* Fix up all variant types of this enum type. */
5891 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5893 if (tem == enumtype)
5895 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5896 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5897 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5898 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5899 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5900 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5901 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5902 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5903 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5904 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5907 /* Finish debugging output for this type. */
5908 rest_of_type_compilation (enumtype, toplevel);
5913 /* Build and install a CONST_DECL for one value of the
5914 current enumeration type (one that was begun with start_enum).
5915 Return a tree-list containing the CONST_DECL and its value.
5916 Assignment of sequential values by default is handled here. */
5919 build_enumerator (name, value)
5924 /* Validate and default VALUE. */
5926 /* Remove no-op casts from the value. */
5928 STRIP_TYPE_NOPS (value);
5932 if (TREE_CODE (value) == INTEGER_CST)
5934 value = default_conversion (value);
5935 constant_expression_warning (value);
5939 error ("enumerator value for `%s' not integer constant",
5940 IDENTIFIER_POINTER (name));
5945 /* Default based on previous value. */
5946 /* It should no longer be possible to have NON_LVALUE_EXPR
5950 value = enum_next_value;
5952 error ("overflow in enumeration values");
5955 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5957 pedwarn ("ISO C restricts enumerator values to range of `int'");
5958 value = convert (integer_type_node, value);
5961 /* Set basis for default for next value. */
5962 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5963 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5965 /* Now create a declaration for the enum value name. */
5967 type = TREE_TYPE (value);
5968 type = type_for_size (MAX (TYPE_PRECISION (type),
5969 TYPE_PRECISION (integer_type_node)),
5971 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5972 && TREE_UNSIGNED (type)));
5974 decl = build_decl (CONST_DECL, name, type);
5975 DECL_INITIAL (decl) = convert (type, value);
5978 return tree_cons (decl, value, NULL_TREE);
5982 /* Create the FUNCTION_DECL for a function definition.
5983 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5984 the declaration; they describe the function's name and the type it returns,
5985 but twisted together in a fashion that parallels the syntax of C.
5987 This function creates a binding context for the function body
5988 as well as setting up the FUNCTION_DECL in current_function_decl.
5990 Returns 1 on success. If the DECLARATOR is not suitable for a function
5991 (it defines a datum instead), we return 0, which tells
5992 yyparse to report a parse error. */
5995 start_function (declspecs, declarator, attributes)
5996 tree declarator, declspecs, attributes;
5998 tree decl1, old_decl;
6000 int old_immediate_size_expand = immediate_size_expand;
6002 current_function_returns_value = 0; /* Assume, until we see it does. */
6003 current_function_returns_null = 0;
6004 warn_about_return_type = 0;
6005 current_extern_inline = 0;
6006 c_function_varargs = 0;
6008 shadowed_labels = 0;
6010 /* Don't expand any sizes in the return type of the function. */
6011 immediate_size_expand = 0;
6013 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6015 /* If the declarator is not suitable for a function definition,
6016 cause a syntax error. */
6019 immediate_size_expand = old_immediate_size_expand;
6023 decl_attributes (&decl1, attributes, 0);
6025 announce_function (decl1);
6027 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6029 error ("return type is an incomplete type");
6030 /* Make it return void instead. */
6032 = build_function_type (void_type_node,
6033 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6036 if (warn_about_return_type)
6037 pedwarn_c99 ("return type defaults to `int'");
6039 /* Save the parm names or decls from this function's declarator
6040 where store_parm_decls will find them. */
6041 current_function_parms = last_function_parms;
6042 current_function_parm_tags = last_function_parm_tags;
6044 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6045 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6046 DECL_INITIAL (decl1) = error_mark_node;
6048 /* If this definition isn't a prototype and we had a prototype declaration
6049 before, copy the arg type info from that prototype.
6050 But not if what we had before was a builtin function. */
6051 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6052 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6053 && !DECL_BUILT_IN (old_decl)
6054 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6055 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6056 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6058 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6059 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6060 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6063 /* If there is no explicit declaration, look for any out-of-scope implicit
6066 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6068 /* Optionally warn of old-fashioned def with no previous prototype. */
6069 if (warn_strict_prototypes
6070 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6072 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6073 || (DECL_BUILT_IN (old_decl)
6074 && ! C_DECL_ANTICIPATED (old_decl)))))
6075 warning ("function declaration isn't a prototype");
6076 /* Optionally warn of any global def with no previous prototype. */
6077 else if (warn_missing_prototypes
6078 && TREE_PUBLIC (decl1)
6080 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6081 || (DECL_BUILT_IN (old_decl)
6082 && ! C_DECL_ANTICIPATED (old_decl))))
6083 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6084 warning_with_decl (decl1, "no previous prototype for `%s'");
6085 /* Optionally warn of any def with no previous prototype
6086 if the function has already been used. */
6087 else if (warn_missing_prototypes
6088 && old_decl != 0 && TREE_USED (old_decl)
6089 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6090 warning_with_decl (decl1,
6091 "`%s' was used with no prototype before its definition");
6092 /* Optionally warn of any global def with no previous declaration. */
6093 else if (warn_missing_declarations
6094 && TREE_PUBLIC (decl1)
6096 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6097 warning_with_decl (decl1, "no previous declaration for `%s'");
6098 /* Optionally warn of any def with no previous declaration
6099 if the function has already been used. */
6100 else if (warn_missing_declarations
6101 && old_decl != 0 && TREE_USED (old_decl)
6102 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6103 warning_with_decl (decl1,
6104 "`%s' was used with no declaration before its definition");
6106 /* This is a definition, not a reference.
6107 So normally clear DECL_EXTERNAL.
6108 However, `extern inline' acts like a declaration
6109 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6110 DECL_EXTERNAL (decl1) = current_extern_inline;
6112 /* This function exists in static storage.
6113 (This does not mean `static' in the C sense!) */
6114 TREE_STATIC (decl1) = 1;
6116 /* A nested function is not global. */
6117 if (current_function_decl != 0)
6118 TREE_PUBLIC (decl1) = 0;
6120 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6121 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6126 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6127 != integer_type_node)
6128 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6130 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6131 args = TREE_CHAIN (args))
6133 tree type = args ? TREE_VALUE (args) : 0;
6135 if (type == void_type_node)
6142 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6143 pedwarn_with_decl (decl1,
6144 "first argument of `%s' should be `int'");
6148 if (TREE_CODE (type) != POINTER_TYPE
6149 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6150 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6152 pedwarn_with_decl (decl1,
6153 "second argument of `%s' should be `char **'");
6157 if (TREE_CODE (type) != POINTER_TYPE
6158 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6159 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6161 pedwarn_with_decl (decl1,
6162 "third argument of `%s' should probably be `char **'");
6167 /* It is intentional that this message does not mention the third
6168 argument because it's only mentioned in an appendix of the
6170 if (argct > 0 && (argct < 2 || argct > 3))
6171 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6173 if (! TREE_PUBLIC (decl1))
6174 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6177 /* Record the decl so that the function name is defined.
6178 If we already have a decl for this name, and it is a FUNCTION_DECL,
6179 use the old decl. */
6181 current_function_decl = pushdecl (decl1);
6184 declare_parm_level (1);
6185 current_binding_level->subblocks_tag_transparent = 1;
6187 make_decl_rtl (current_function_decl, NULL);
6189 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6190 /* Promote the value to int before returning it. */
6191 if (c_promoting_integer_type_p (restype))
6193 /* It retains unsignedness if traditional
6194 or if not really getting wider. */
6195 if (TREE_UNSIGNED (restype)
6196 && (flag_traditional
6197 || (TYPE_PRECISION (restype)
6198 == TYPE_PRECISION (integer_type_node))))
6199 restype = unsigned_type_node;
6201 restype = integer_type_node;
6203 DECL_RESULT (current_function_decl)
6204 = build_decl (RESULT_DECL, NULL_TREE, restype);
6206 /* If this fcn was already referenced via a block-scope `extern' decl
6207 (or an implicit decl), propagate certain information about the usage. */
6208 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6209 TREE_ADDRESSABLE (current_function_decl) = 1;
6211 immediate_size_expand = old_immediate_size_expand;
6213 start_fname_decls ();
6218 /* Record that this function is going to be a varargs function.
6219 This is called before store_parm_decls, which is too early
6220 to call mark_varargs directly. */
6225 c_function_varargs = 1;
6228 /* Store the parameter declarations into the current function declaration.
6229 This is called after parsing the parameter declarations, before
6230 digesting the body of the function.
6232 For an old-style definition, modify the function's type
6233 to specify at least the number of arguments. */
6238 tree fndecl = current_function_decl;
6241 /* This is either a chain of PARM_DECLs (if a prototype was used)
6242 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6243 tree specparms = current_function_parms;
6245 /* This is a list of types declared among parms in a prototype. */
6246 tree parmtags = current_function_parm_tags;
6248 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6249 tree parmdecls = getdecls ();
6251 /* This is a chain of any other decls that came in among the parm
6252 declarations. If a parm is declared with enum {foo, bar} x;
6253 then CONST_DECLs for foo and bar are put here. */
6256 /* Nonzero if this definition is written with a prototype. */
6259 /* The function containing FNDECL, if any. */
6260 tree context = decl_function_context (fndecl);
6262 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6264 /* This case is when the function was defined with an ANSI prototype.
6265 The parms already have decls, so we need not do anything here
6266 except record them as in effect
6267 and complain if any redundant old-style parm decls were written. */
6278 error_with_decl (fndecl,
6279 "parm types given both in parmlist and separately");
6280 /* Get rid of the erroneous decls; don't keep them on
6281 the list of parms, since they might not be PARM_DECLs. */
6282 for (decl = current_binding_level->names;
6283 decl; decl = TREE_CHAIN (decl))
6284 if (DECL_NAME (decl))
6285 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6286 for (link = current_binding_level->shadowed;
6287 link; link = TREE_CHAIN (link))
6288 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6289 current_binding_level->names = 0;
6290 current_binding_level->shadowed = 0;
6293 specparms = nreverse (specparms);
6294 for (parm = specparms; parm; parm = next)
6296 next = TREE_CHAIN (parm);
6297 if (TREE_CODE (parm) == PARM_DECL)
6299 if (DECL_NAME (parm) == 0)
6300 error_with_decl (parm, "parameter name omitted");
6301 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6302 && VOID_TYPE_P (TREE_TYPE (parm)))
6304 error_with_decl (parm, "parameter `%s' declared void");
6305 /* Change the type to error_mark_node so this parameter
6306 will be ignored by assign_parms. */
6307 TREE_TYPE (parm) = error_mark_node;
6313 /* If we find an enum constant or a type tag,
6314 put it aside for the moment. */
6315 TREE_CHAIN (parm) = 0;
6316 others = chainon (others, parm);
6320 /* Get the decls in their original chain order
6321 and record in the function. */
6322 DECL_ARGUMENTS (fndecl) = getdecls ();
6325 /* If this function takes a variable number of arguments,
6326 add a phony parameter to the end of the parm list,
6327 to represent the position of the first unnamed argument. */
6328 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6331 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6332 /* Let's hope the address of the unnamed parm
6333 won't depend on its type. */
6334 TREE_TYPE (dummy) = integer_type_node;
6335 DECL_ARG_TYPE (dummy) = integer_type_node;
6336 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6340 /* Now pushdecl the enum constants. */
6341 for (parm = others; parm; parm = next)
6343 next = TREE_CHAIN (parm);
6344 if (DECL_NAME (parm) == 0)
6346 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6348 else if (TREE_CODE (parm) != PARM_DECL)
6352 storetags (chainon (parmtags, gettags ()));
6356 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6357 each with a parm name as the TREE_VALUE.
6359 PARMDECLS is a chain of declarations for parameters.
6360 Warning! It can also contain CONST_DECLs which are not parameters
6361 but are names of enumerators of any enum types
6362 declared among the parameters.
6364 First match each formal parameter name with its declaration.
6365 Associate decls with the names and store the decls
6366 into the TREE_PURPOSE slots. */
6368 /* We use DECL_WEAK as a flag to show which parameters have been
6369 seen already since it is not used on PARM_DECL or CONST_DECL. */
6370 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6371 DECL_WEAK (parm) = 0;
6373 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6375 tree tail, found = NULL;
6377 if (TREE_VALUE (parm) == 0)
6379 error_with_decl (fndecl,
6380 "parameter name missing from parameter list");
6381 TREE_PURPOSE (parm) = 0;
6385 /* See if any of the parmdecls specifies this parm by name.
6386 Ignore any enumerator decls. */
6387 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6388 if (DECL_NAME (tail) == TREE_VALUE (parm)
6389 && TREE_CODE (tail) == PARM_DECL)
6395 /* If declaration already marked, we have a duplicate name.
6396 Complain, and don't use this decl twice. */
6397 if (found && DECL_WEAK (found))
6399 error_with_decl (found, "multiple parameters named `%s'");
6403 /* If the declaration says "void", complain and ignore it. */
6404 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6406 error_with_decl (found, "parameter `%s' declared void");
6407 TREE_TYPE (found) = integer_type_node;
6408 DECL_ARG_TYPE (found) = integer_type_node;
6409 layout_decl (found, 0);
6412 /* Traditionally, a parm declared float is actually a double. */
6413 if (found && flag_traditional
6414 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6416 TREE_TYPE (found) = double_type_node;
6417 DECL_ARG_TYPE (found) = double_type_node;
6418 layout_decl (found, 0);
6421 /* If no declaration found, default to int. */
6424 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6426 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6427 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6428 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6430 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6431 else if (extra_warnings)
6432 warning_with_decl (found, "type of `%s' defaults to `int'");
6436 TREE_PURPOSE (parm) = found;
6438 /* Mark this decl as "already found". */
6439 DECL_WEAK (found) = 1;
6442 /* Put anything which is on the parmdecls chain and which is
6443 not a PARM_DECL onto the list NONPARMS. (The types of
6444 non-parm things which might appear on the list include
6445 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6446 any actual PARM_DECLs not matched with any names. */
6449 for (parm = parmdecls; parm;)
6451 tree next = TREE_CHAIN (parm);
6452 TREE_CHAIN (parm) = 0;
6454 if (TREE_CODE (parm) != PARM_DECL)
6455 nonparms = chainon (nonparms, parm);
6458 /* Complain about args with incomplete types. */
6459 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6461 error_with_decl (parm, "parameter `%s' has incomplete type");
6462 TREE_TYPE (parm) = error_mark_node;
6465 if (! DECL_WEAK (parm))
6467 error_with_decl (parm,
6468 "declaration for parameter `%s' but no such parameter");
6469 /* Pretend the parameter was not missing.
6470 This gets us to a standard state and minimizes
6471 further error messages. */
6473 = chainon (specparms,
6474 tree_cons (parm, NULL_TREE, NULL_TREE));
6481 /* Chain the declarations together in the order of the list of
6482 names. Store that chain in the function decl, replacing the
6485 DECL_ARGUMENTS (fndecl) = 0;
6488 for (last = 0; parm; parm = TREE_CHAIN (parm))
6489 if (TREE_PURPOSE (parm))
6492 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6494 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6495 last = TREE_PURPOSE (parm);
6496 TREE_CHAIN (last) = 0;
6500 /* If there was a previous prototype,
6501 set the DECL_ARG_TYPE of each argument according to
6502 the type previously specified, and report any mismatches. */
6504 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6507 for (parm = DECL_ARGUMENTS (fndecl),
6508 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6509 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6510 != void_type_node));
6511 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6513 if (parm == 0 || type == 0
6514 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6516 error ("number of arguments doesn't match prototype");
6517 error_with_file_and_line (current_function_prototype_file,
6518 current_function_prototype_line,
6519 "prototype declaration");
6522 /* Type for passing arg must be consistent with that
6523 declared for the arg. ISO C says we take the unqualified
6524 type for parameters declared with qualified type. */
6525 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6526 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6528 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6529 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6531 /* Adjust argument to match prototype. E.g. a previous
6532 `int foo(float);' prototype causes
6533 `int foo(x) float x; {...}' to be treated like
6534 `int foo(float x) {...}'. This is particularly
6535 useful for argument types like uid_t. */
6536 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6538 if (PROMOTE_PROTOTYPES
6539 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6540 && TYPE_PRECISION (TREE_TYPE (parm))
6541 < TYPE_PRECISION (integer_type_node))
6542 DECL_ARG_TYPE (parm) = integer_type_node;
6546 pedwarn ("promoted argument `%s' doesn't match prototype",
6547 IDENTIFIER_POINTER (DECL_NAME (parm)));
6548 warning_with_file_and_line
6549 (current_function_prototype_file,
6550 current_function_prototype_line,
6551 "prototype declaration");
6554 /* If -traditional, allow `int' argument to match
6555 `unsigned' prototype. */
6556 else if (! (flag_traditional
6557 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6558 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6560 error ("argument `%s' doesn't match prototype",
6561 IDENTIFIER_POINTER (DECL_NAME (parm)));
6562 error_with_file_and_line (current_function_prototype_file,
6563 current_function_prototype_line,
6564 "prototype declaration");
6568 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6571 /* Otherwise, create a prototype that would match. */
6575 tree actual = 0, last = 0, type;
6577 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6579 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6581 TREE_CHAIN (last) = type;
6586 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6588 TREE_CHAIN (last) = type;
6592 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6593 of the type of this function, but we need to avoid having this
6594 affect the types of other similarly-typed functions, so we must
6595 first force the generation of an identical (but separate) type
6596 node for the relevant function type. The new node we create
6597 will be a variant of the main variant of the original function
6600 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6602 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6605 /* Now store the final chain of decls for the arguments
6606 as the decl-chain of the current lexical scope.
6607 Put the enumerators in as well, at the front so that
6608 DECL_ARGUMENTS is not modified. */
6610 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6613 /* Make sure the binding level for the top of the function body
6614 gets a BLOCK if there are any in the function.
6615 Otherwise, the dbx output is wrong. */
6617 keep_next_if_subblocks = 1;
6619 /* ??? This might be an improvement,
6620 but needs to be thought about some more. */
6622 keep_next_level_flag = 1;
6625 /* Write a record describing this function definition to the prototypes
6626 file (if requested). */
6628 gen_aux_info_record (fndecl, 1, 0, prototype);
6630 /* Initialize the RTL code for the function. */
6631 init_function_start (fndecl, input_filename, lineno);
6633 /* Begin the statement tree for this function. */
6634 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6636 /* If this is a nested function, save away the sizes of any
6637 variable-size types so that we can expand them when generating
6643 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6644 = nreverse (get_pending_sizes ());
6645 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6648 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6651 /* This function is being processed in whole-function mode. */
6652 cfun->x_whole_function_mode_p = 1;
6654 /* Even though we're inside a function body, we still don't want to
6655 call expand_expr to calculate the size of a variable-sized array.
6656 We haven't necessarily assigned RTL to all variables yet, so it's
6657 not safe to try to expand expressions involving them. */
6658 immediate_size_expand = 0;
6659 cfun->x_dont_save_pending_sizes_p = 1;
6662 /* Finish up a function declaration and compile that function
6663 all the way to assembler language output. The free the storage
6664 for the function definition.
6666 This is called after parsing the body of the function definition.
6668 NESTED is nonzero if the function being finished is nested in another. */
6671 finish_function (nested)
6674 tree fndecl = current_function_decl;
6676 /* TREE_READONLY (fndecl) = 1;
6677 This caused &foo to be of type ptr-to-const-function
6678 which then got a warning when stored in a ptr-to-function variable. */
6681 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6683 /* Must mark the RESULT_DECL as being in this function. */
6685 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6687 /* Obey `register' declarations if `setjmp' is called in this fn. */
6688 if (flag_traditional && current_function_calls_setjmp)
6690 setjmp_protect (DECL_INITIAL (fndecl));
6691 setjmp_protect_args ();
6694 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6696 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6697 != integer_type_node)
6699 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6700 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6702 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6706 #ifdef DEFAULT_MAIN_RETURN
6707 /* Make it so that `main' always returns success by default. */
6708 DEFAULT_MAIN_RETURN;
6711 c_expand_return (integer_zero_node);
6716 finish_fname_decls ();
6718 /* Tie off the statement tree for this function. */
6719 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6720 /* Clear out memory we no longer need. */
6721 free_after_parsing (cfun);
6722 /* Since we never call rest_of_compilation, we never clear
6723 CFUN. Do so explicitly. */
6724 free_after_compilation (cfun);
6729 /* Generate RTL for the body of this function. */
6730 c_expand_body (fndecl, nested);
6731 /* Let the error reporting routines know that we're outside a
6732 function. For a nested function, this value is used in
6733 pop_c_function_context and then reset via pop_function_context. */
6734 current_function_decl = NULL;
6738 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6739 then we are already in the process of generating RTL for another
6743 c_expand_body (fndecl, nested_p)
6747 int uninlinable = 1;
6749 /* There's no reason to do any of the work here if we're only doing
6750 semantic analysis; this code just generates RTL. */
6751 if (flag_syntax_only)
6754 if (flag_inline_trees)
6756 /* First, cache whether the current function is inlinable. Some
6757 predicates depend on cfun and current_function_decl to
6758 function completely. */
6759 uninlinable = ! tree_inlinable_function_p (fndecl);
6761 /* Then, inline any functions called in it. */
6762 optimize_inline_calls (fndecl);
6767 /* Make sure that we will evaluate variable-sized types involved
6768 in our function's type. */
6769 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6770 /* Squirrel away our current state. */
6771 push_function_context ();
6774 /* Initialize the RTL code for the function. */
6775 current_function_decl = fndecl;
6776 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6778 /* This function is being processed in whole-function mode. */
6779 cfun->x_whole_function_mode_p = 1;
6781 /* Even though we're inside a function body, we still don't want to
6782 call expand_expr to calculate the size of a variable-sized array.
6783 We haven't necessarily assigned RTL to all variables yet, so it's
6784 not safe to try to expand expressions involving them. */
6785 immediate_size_expand = 0;
6786 cfun->x_dont_save_pending_sizes_p = 1;
6788 /* If this is a varargs function, inform function.c. */
6789 if (c_function_varargs)
6792 /* Set up parameters and prepare for return, for the function. */
6793 expand_function_start (fndecl, 0);
6795 /* If this function is `main', emit a call to `__main'
6796 to run global initializers, etc. */
6797 if (DECL_NAME (fndecl)
6798 && MAIN_NAME_P (DECL_NAME (fndecl))
6799 && DECL_CONTEXT (fndecl) == NULL_TREE)
6800 expand_main_function ();
6802 /* Generate the RTL for this function. */
6803 expand_stmt (DECL_SAVED_TREE (fndecl));
6806 /* Allow the body of the function to be garbage collected. */
6807 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6810 /* We hard-wired immediate_size_expand to zero above.
6811 expand_function_end will decrement this variable. So, we set the
6812 variable to one here, so that after the decrement it will remain
6814 immediate_size_expand = 1;
6816 /* Allow language dialects to perform special processing. */
6817 if (lang_expand_function_end)
6818 (*lang_expand_function_end) ();
6820 /* Generate rtl for function exit. */
6821 expand_function_end (input_filename, lineno, 0);
6823 /* If this is a nested function, protect the local variables in the stack
6824 above us from being collected while we're compiling this function. */
6826 ggc_push_context ();
6828 /* Run the optimizers and output the assembler code for this function. */
6829 rest_of_compilation (fndecl);
6831 /* Undo the GC context switch. */
6835 /* With just -W, complain only if function returns both with
6836 and without a value. */
6838 && current_function_returns_value
6839 && current_function_returns_null)
6840 warning ("this function may return with or without a value");
6842 /* If requested, warn about function definitions where the function will
6843 return a value (usually of some struct or union type) which itself will
6844 take up a lot of stack space. */
6846 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6848 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6850 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6851 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6852 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6855 unsigned int size_as_int
6856 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6858 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6859 warning_with_decl (fndecl,
6860 "size of return value of `%s' is %u bytes",
6863 warning_with_decl (fndecl,
6864 "size of return value of `%s' is larger than %d bytes",
6869 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6870 && ! flag_inline_trees)
6872 /* Stop pointing to the local nodes about to be freed.
6873 But DECL_INITIAL must remain nonzero so we know this
6874 was an actual function definition.
6875 For a nested function, this is done in pop_c_function_context.
6876 If rest_of_compilation set this to 0, leave it 0. */
6877 if (DECL_INITIAL (fndecl) != 0)
6878 DECL_INITIAL (fndecl) = error_mark_node;
6880 DECL_ARGUMENTS (fndecl) = 0;
6883 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6885 if (targetm.have_ctors_dtors)
6886 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6887 DEFAULT_INIT_PRIORITY);
6889 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6892 if (DECL_STATIC_DESTRUCTOR (fndecl))
6894 if (targetm.have_ctors_dtors)
6895 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6896 DEFAULT_INIT_PRIORITY);
6898 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6902 /* Return to the enclosing function. */
6903 pop_function_context ();
6906 /* Check the declarations given in a for-loop for satisfying the C99
6909 check_for_loop_decls ()
6915 /* If we get here, declarations have been used in a for loop without
6916 the C99 for loop scope. This doesn't make much sense, so don't
6918 error ("`for' loop initial declaration used outside C99 mode");
6921 /* C99 subclause 6.8.5 paragraph 3:
6923 [#3] The declaration part of a for statement shall only
6924 declare identifiers for objects having storage class auto or
6927 It isn't clear whether, in this sentence, "identifiers" binds to
6928 "shall only declare" or to "objects" - that is, whether all identifiers
6929 declared must be identifiers for objects, or whether the restriction
6930 only applies to those that are. (A question on this in comp.std.c
6931 in November 2000 received no answer.) We implement the strictest
6932 interpretation, to avoid creating an extension which later causes
6935 for (t = gettags (); t; t = TREE_CHAIN (t))
6937 if (TREE_PURPOSE (t) != 0)
6938 error ("`%s %s' declared in `for' loop initial declaration",
6939 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6940 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6942 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6944 for (t = getdecls (); t; t = TREE_CHAIN (t))
6946 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6947 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6948 else if (TREE_STATIC (t))
6949 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6950 else if (DECL_EXTERNAL (t))
6951 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6955 /* Save and restore the variables in this file and elsewhere
6956 that keep track of the progress of compilation of the current function.
6957 Used for nested functions. */
6959 struct c_language_function
6961 struct language_function base;
6963 tree shadowed_labels;
6966 int warn_about_return_type;
6968 struct binding_level *binding_level;
6971 /* Save and reinitialize the variables
6972 used during compilation of a C function. */
6975 push_c_function_context (f)
6978 struct c_language_function *p;
6979 p = ((struct c_language_function *)
6980 xmalloc (sizeof (struct c_language_function)));
6981 f->language = (struct language_function *) p;
6983 p->base.x_stmt_tree = c_stmt_tree;
6984 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6985 p->named_labels = named_labels;
6986 p->shadowed_labels = shadowed_labels;
6987 p->returns_value = current_function_returns_value;
6988 p->returns_null = current_function_returns_null;
6989 p->warn_about_return_type = warn_about_return_type;
6990 p->extern_inline = current_extern_inline;
6991 p->binding_level = current_binding_level;
6994 /* Restore the variables used during compilation of a C function. */
6997 pop_c_function_context (f)
7000 struct c_language_function *p
7001 = (struct c_language_function *) f->language;
7004 /* Bring back all the labels that were shadowed. */
7005 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7006 if (DECL_NAME (TREE_VALUE (link)) != 0)
7007 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7008 = TREE_VALUE (link);
7010 if (DECL_SAVED_INSNS (current_function_decl) == 0
7011 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7013 /* Stop pointing to the local nodes about to be freed. */
7014 /* But DECL_INITIAL must remain nonzero so we know this
7015 was an actual function definition. */
7016 DECL_INITIAL (current_function_decl) = error_mark_node;
7017 DECL_ARGUMENTS (current_function_decl) = 0;
7020 c_stmt_tree = p->base.x_stmt_tree;
7021 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7022 named_labels = p->named_labels;
7023 shadowed_labels = p->shadowed_labels;
7024 current_function_returns_value = p->returns_value;
7025 current_function_returns_null = p->returns_null;
7026 warn_about_return_type = p->warn_about_return_type;
7027 current_extern_inline = p->extern_inline;
7028 current_binding_level = p->binding_level;
7034 /* Mark the language specific parts of F for GC. */
7037 mark_c_function_context (f)
7040 struct c_language_function *p
7041 = (struct c_language_function *) f->language;
7046 mark_c_language_function (&p->base);
7047 ggc_mark_tree (p->shadowed_labels);
7048 ggc_mark_tree (p->named_labels);
7049 mark_binding_level (&p->binding_level);
7052 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7055 copy_lang_decl (decl)
7058 struct lang_decl *ld;
7060 if (!DECL_LANG_SPECIFIC (decl))
7063 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7064 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7065 sizeof (struct lang_decl));
7066 DECL_LANG_SPECIFIC (decl) = ld;
7069 /* Mark the language specific bits in T for GC. */
7075 if (TREE_CODE (t) == IDENTIFIER_NODE)
7077 struct lang_identifier *i = (struct lang_identifier *) t;
7078 ggc_mark_tree (i->global_value);
7079 ggc_mark_tree (i->local_value);
7080 ggc_mark_tree (i->label_value);
7081 ggc_mark_tree (i->implicit_decl);
7082 ggc_mark_tree (i->error_locus);
7083 ggc_mark_tree (i->limbo_value);
7085 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7086 ggc_mark (TYPE_LANG_SPECIFIC (t));
7087 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7089 ggc_mark (DECL_LANG_SPECIFIC (t));
7090 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7091 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7095 /* The functions below are required for functionality of doing
7096 function at once processing in the C front end. Currently these
7097 functions are not called from anywhere in the C front end, but as
7098 these changes continue, that will change. */
7100 /* Returns non-zero if the current statement is a full expression,
7101 i.e. temporaries created during that statement should be destroyed
7102 at the end of the statement. */
7105 stmts_are_full_exprs_p ()
7110 /* Returns the stmt_tree (if any) to which statements are currently
7111 being added. If there is no active statement-tree, NULL is
7115 current_stmt_tree ()
7117 return &c_stmt_tree;
7120 /* Returns the stack of SCOPE_STMTs for the current function. */
7123 current_scope_stmt_stack ()
7125 return &c_scope_stmt_stack;
7128 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7132 anon_aggr_type_p (node)
7133 tree node ATTRIBUTE_UNUSED;
7138 /* Dummy function in place of callback used by C++. */
7141 extract_interface_info ()
7145 /* Return a new COMPOUND_STMT, after adding it to the current
7149 c_begin_compound_stmt ()
7153 /* Create the COMPOUND_STMT. */
7154 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7159 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7163 c_expand_decl_stmt (t)
7166 tree decl = DECL_STMT_DECL (t);
7168 /* Expand nested functions. */
7169 if (TREE_CODE (decl) == FUNCTION_DECL
7170 && DECL_CONTEXT (decl) == current_function_decl
7171 && DECL_SAVED_TREE (decl))
7172 c_expand_body (decl, /*nested_p=*/1);
7175 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7176 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7179 identifier_global_value (t)
7182 return IDENTIFIER_GLOBAL_VALUE (t);
7185 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7186 otherwise the name is found in ridpointers from RID_INDEX. */
7189 record_builtin_type (rid_index, name, type)
7196 id = ridpointers[(int) rid_index];
7198 id = get_identifier (name);
7199 pushdecl (build_decl (TYPE_DECL, id, type));
7202 /* Build the void_list_node (void_type_node having been created). */
7204 build_void_list_node ()
7206 tree t = build_tree_list (NULL_TREE, void_type_node);