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"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static tree shadowed_labels;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to nonzero by `grokdeclarator' for a function
138 whose return type is defaulted, if warnings for this are desired. */
140 static int warn_about_return_type;
142 /* Nonzero when starting a function declared `extern inline'. */
144 static int current_extern_inline;
146 /* For each binding contour we allocate a binding_level structure
147 * which records the names defined in that contour.
150 * 1) one for each function definition,
151 * where internal declarations of the parameters appear.
152 * 2) one for each compound statement,
153 * to record its declarations.
155 * The current meaning of a name can be found by searching the levels from
156 * the current one out to the global one.
159 /* Note that the information in the `names' component of the global contour
160 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
164 /* A chain of _DECL nodes for all variables, constants, functions,
165 and typedef types. These are in the reverse of the order supplied.
169 /* A list of structure, union and enum definitions,
170 * for looking up tag names.
171 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
172 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
173 * or ENUMERAL_TYPE node.
177 /* For each level, a list of shadowed outer-level local definitions
178 to be restored when this level is popped.
179 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
180 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
183 /* For each level (except not the global one),
184 a chain of BLOCK nodes for all the levels
185 that were entered and exited one level down. */
188 /* The BLOCK node for this level, if one has been preallocated.
189 If 0, the BLOCK is allocated (if needed) when the level is popped. */
192 /* The binding level which this one is contained in (inherits from). */
193 struct binding_level *level_chain;
195 /* Nonzero for the level that holds the parameters of a function. */
198 /* Nonzero if this level "doesn't exist" for tags. */
199 char tag_transparent;
201 /* Nonzero if sublevels of this level "don't exist" for tags.
202 This is set in the parm level of a function definition
203 while reading the function body, so that the outermost block
204 of the function body will be tag-transparent. */
205 char subblocks_tag_transparent;
207 /* Nonzero means make a BLOCK for this level regardless of all else. */
210 /* Nonzero means make a BLOCK if this level has any subblocks. */
211 char keep_if_subblocks;
213 /* Number of decls in `names' that have incomplete
214 structure or union types. */
217 /* A list of decls giving the (reversed) specified order of parms,
218 not including any forward-decls in the parmlist.
219 This is so we can put the parms in proper order for assign_parms. */
223 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
225 /* The binding level currently in effect. */
227 static struct binding_level *current_binding_level;
229 /* A chain of binding_level structures awaiting reuse. */
231 static struct binding_level *free_binding_level;
233 /* The outermost binding level, for names of file scope.
234 This is created when the compiler is started and exists
235 through the entire run. */
237 static struct binding_level *global_binding_level;
239 /* Binding level structures are initialized by copying this one. */
241 static struct binding_level clear_binding_level
242 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
245 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
247 static int keep_next_level_flag;
249 /* Nonzero means make a BLOCK for the next level pushed
250 if it has subblocks. */
252 static int keep_next_if_subblocks;
254 /* The chain of outer levels of label scopes.
255 This uses the same data structure used for binding levels,
256 but it works differently: each link in the chain records
257 saved values of named_labels and shadowed_labels for
258 a label binding level outside the current one. */
260 static struct binding_level *label_level_chain;
262 /* Functions called automatically at the beginning and end of execution. */
264 tree static_ctors, static_dtors;
266 /* Forward declarations. */
268 static struct binding_level * make_binding_level PARAMS ((void));
269 static void mark_binding_level PARAMS ((void *));
270 static void clear_limbo_values PARAMS ((tree));
271 static int duplicate_decls PARAMS ((tree, tree, int));
272 static int redeclaration_error_message PARAMS ((tree, tree));
273 static void storedecls PARAMS ((tree));
274 static void storetags PARAMS ((tree));
275 static tree lookup_tag PARAMS ((enum tree_code, tree,
276 struct binding_level *, int));
277 static tree lookup_tag_reverse PARAMS ((tree));
278 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
280 static tree grokparms PARAMS ((tree, int));
281 static void layout_array_type PARAMS ((tree));
282 static tree c_make_fname_decl PARAMS ((tree, int));
283 static void c_expand_body PARAMS ((tree, int, int));
284 static void warn_if_shadowing PARAMS ((tree, tree));
286 /* C-specific option variables. */
288 /* Nonzero means allow type mismatches in conditional expressions;
289 just make their values `void'. */
291 int flag_cond_mismatch;
293 /* Nonzero means don't recognize the keyword `asm'. */
297 /* Nonzero means do some things the same way PCC does. */
299 int flag_traditional;
301 /* Nonzero means enable C89 Amendment 1 features. */
305 /* Nonzero means use the ISO C99 dialect of C. */
309 /* Nonzero means that we have builtin functions, and main is an int */
313 /* Nonzero means add default format_arg attributes for functions not
316 int flag_noniso_default_format_attributes = 1;
318 /* Nonzero means to allow single precision math even if we're generally
319 being traditional. */
320 int flag_allow_single_precision = 0;
322 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
324 int flag_signed_bitfields = 1;
325 int explicit_flag_signed_bitfields = 0;
327 /* Nonzero means warn about use of implicit int. */
329 int warn_implicit_int;
331 /* Nonzero means warn about usage of long long when `-pedantic'. */
333 int warn_long_long = 1;
335 /* Nonzero means message about use of implicit function declarations;
336 1 means warning; 2 means error. */
338 int mesg_implicit_function_declaration = -1;
340 /* Nonzero means give string constants the type `const char *'
341 to get extra warnings from them. These warnings will be too numerous
342 to be useful, except in thoroughly ANSIfied programs. */
344 int flag_const_strings;
346 /* Nonzero means warn about pointer casts that can drop a type qualifier
347 from the pointer target type. */
351 /* Nonzero means warn when casting a function call to a type that does
352 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
353 when there is no previous declaration of sqrt or malloc. */
355 int warn_bad_function_cast;
357 /* Warn about functions which might be candidates for format attributes. */
359 int warn_missing_format_attribute;
361 /* Warn about traditional constructs whose meanings changed in ANSI C. */
363 int warn_traditional;
365 /* Nonzero means warn about sizeof(function) or addition/subtraction
366 of function pointers. */
368 int warn_pointer_arith;
370 /* Nonzero means warn for non-prototype function decls
371 or non-prototyped defs without previous prototype. */
373 int warn_strict_prototypes;
375 /* Nonzero means warn for any global function def
376 without separate previous prototype decl. */
378 int warn_missing_prototypes;
380 /* Nonzero means warn for any global function def
381 without separate previous decl. */
383 int warn_missing_declarations;
385 /* Nonzero means warn about multiple (redundant) decls for the same single
386 variable or function. */
388 int warn_redundant_decls = 0;
390 /* Nonzero means warn about extern declarations of objects not at
391 file-scope level and about *all* declarations of functions (whether
392 extern or static) not at file-scope level. Note that we exclude
393 implicit function declarations. To get warnings about those, use
396 int warn_nested_externs = 0;
398 /* Warn about a subscript that has type char. */
400 int warn_char_subscripts = 0;
402 /* Warn if a type conversion is done that might have confusing results. */
406 /* Warn if adding () is suggested. */
408 int warn_parentheses;
410 /* Warn if initializer is not completely bracketed. */
412 int warn_missing_braces;
414 /* Warn if main is suspicious. */
418 /* Warn about #pragma directives that are not recognised. */
420 int warn_unknown_pragmas = 0; /* Tri state variable. */
422 /* Warn about comparison of signed and unsigned values.
423 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
425 int warn_sign_compare = -1;
427 /* Warn about testing equality of floating point numbers. */
429 int warn_float_equal = 0;
431 /* Nonzero means warn about use of multicharacter literals. */
433 int warn_multichar = 1;
435 /* Nonzero means `$' can be in an identifier. */
437 #ifndef DOLLARS_IN_IDENTIFIERS
438 #define DOLLARS_IN_IDENTIFIERS 1
440 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
442 /* Decode the string P as a language-specific option for C.
443 Return the number of strings consumed. Should not complain
444 if it does not recognise the option. */
447 c_decode_option (argc, argv)
448 int argc ATTRIBUTE_UNUSED;
451 int strings_processed;
454 strings_processed = cpp_handle_option (parse_in, argc, argv);
456 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
458 warning ("-traditional is deprecated and may be removed");
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 (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
599 disable_builtin_function (p + strlen ("-fno-builtin-"));
600 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
602 else if (!strcmp (p, "-ansi"))
604 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
605 mesg_implicit_function_declaration = 2;
606 else if (!strcmp (p, "-Wimplicit-function-declaration"))
607 mesg_implicit_function_declaration = 1;
608 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
609 mesg_implicit_function_declaration = 0;
610 else if (!strcmp (p, "-Wimplicit-int"))
611 warn_implicit_int = 1;
612 else if (!strcmp (p, "-Wno-implicit-int"))
613 warn_implicit_int = 0;
614 else if (!strcmp (p, "-Wimplicit"))
616 warn_implicit_int = 1;
617 if (mesg_implicit_function_declaration != 2)
618 mesg_implicit_function_declaration = 1;
620 else if (!strcmp (p, "-Wno-implicit"))
621 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
622 else if (!strcmp (p, "-Wlong-long"))
624 else if (!strcmp (p, "-Wno-long-long"))
626 else if (!strcmp (p, "-Wwrite-strings"))
627 flag_const_strings = 1;
628 else if (!strcmp (p, "-Wno-write-strings"))
629 flag_const_strings = 0;
630 else if (!strcmp (p, "-Wcast-qual"))
632 else if (!strcmp (p, "-Wno-cast-qual"))
634 else if (!strcmp (p, "-Wbad-function-cast"))
635 warn_bad_function_cast = 1;
636 else if (!strcmp (p, "-Wno-bad-function-cast"))
637 warn_bad_function_cast = 0;
638 else if (!strcmp (p, "-Wno-missing-noreturn"))
639 warn_missing_noreturn = 0;
640 else if (!strcmp (p, "-Wmissing-format-attribute"))
641 warn_missing_format_attribute = 1;
642 else if (!strcmp (p, "-Wno-missing-format-attribute"))
643 warn_missing_format_attribute = 0;
644 else if (!strcmp (p, "-Wpointer-arith"))
645 warn_pointer_arith = 1;
646 else if (!strcmp (p, "-Wno-pointer-arith"))
647 warn_pointer_arith = 0;
648 else if (!strcmp (p, "-Wstrict-prototypes"))
649 warn_strict_prototypes = 1;
650 else if (!strcmp (p, "-Wno-strict-prototypes"))
651 warn_strict_prototypes = 0;
652 else if (!strcmp (p, "-Wmissing-prototypes"))
653 warn_missing_prototypes = 1;
654 else if (!strcmp (p, "-Wno-missing-prototypes"))
655 warn_missing_prototypes = 0;
656 else if (!strcmp (p, "-Wmissing-declarations"))
657 warn_missing_declarations = 1;
658 else if (!strcmp (p, "-Wno-missing-declarations"))
659 warn_missing_declarations = 0;
660 else if (!strcmp (p, "-Wredundant-decls"))
661 warn_redundant_decls = 1;
662 else if (!strcmp (p, "-Wno-redundant-decls"))
663 warn_redundant_decls = 0;
664 else if (!strcmp (p, "-Wnested-externs"))
665 warn_nested_externs = 1;
666 else if (!strcmp (p, "-Wno-nested-externs"))
667 warn_nested_externs = 0;
668 else if (!strcmp (p, "-Wtraditional"))
669 warn_traditional = 1;
670 else if (!strcmp (p, "-Wno-traditional"))
671 warn_traditional = 0;
672 else if (!strncmp (p, "-Wformat=", 9))
673 set_Wformat (atoi (p + 9));
674 else if (!strcmp (p, "-Wformat"))
676 else if (!strcmp (p, "-Wno-format"))
678 else if (!strcmp (p, "-Wformat-y2k"))
680 else if (!strcmp (p, "-Wno-format-y2k"))
682 else if (!strcmp (p, "-Wformat-extra-args"))
683 warn_format_extra_args = 1;
684 else if (!strcmp (p, "-Wno-format-extra-args"))
685 warn_format_extra_args = 0;
686 else if (!strcmp (p, "-Wformat-nonliteral"))
687 warn_format_nonliteral = 1;
688 else if (!strcmp (p, "-Wno-format-nonliteral"))
689 warn_format_nonliteral = 0;
690 else if (!strcmp (p, "-Wformat-security"))
691 warn_format_security = 1;
692 else if (!strcmp (p, "-Wno-format-security"))
693 warn_format_security = 0;
694 else if (!strcmp (p, "-Wchar-subscripts"))
695 warn_char_subscripts = 1;
696 else if (!strcmp (p, "-Wno-char-subscripts"))
697 warn_char_subscripts = 0;
698 else if (!strcmp (p, "-Wconversion"))
700 else if (!strcmp (p, "-Wno-conversion"))
702 else if (!strcmp (p, "-Wparentheses"))
703 warn_parentheses = 1;
704 else if (!strcmp (p, "-Wno-parentheses"))
705 warn_parentheses = 0;
706 else if (!strcmp (p, "-Wreturn-type"))
707 warn_return_type = 1;
708 else if (!strcmp (p, "-Wno-return-type"))
709 warn_return_type = 0;
710 else if (!strcmp (p, "-Wsequence-point"))
711 warn_sequence_point = 1;
712 else if (!strcmp (p, "-Wno-sequence-point"))
713 warn_sequence_point = 0;
714 else if (!strcmp (p, "-Wcomment"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p, "-Wno-comment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wcomments"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wno-comments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wtrigraphs"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wno-trigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wundef"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wno-undef"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wimport"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wno-import"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wmissing-braces"))
735 warn_missing_braces = 1;
736 else if (!strcmp (p, "-Wno-missing-braces"))
737 warn_missing_braces = 0;
738 else if (!strcmp (p, "-Wmain"))
740 else if (!strcmp (p, "-Wno-main"))
742 else if (!strcmp (p, "-Wsign-compare"))
743 warn_sign_compare = 1;
744 else if (!strcmp (p, "-Wno-sign-compare"))
745 warn_sign_compare = 0;
746 else if (!strcmp (p, "-Wfloat-equal"))
747 warn_float_equal = 1;
748 else if (!strcmp (p, "-Wno-float-equal"))
749 warn_float_equal = 0;
750 else if (!strcmp (p, "-Wmultichar"))
752 else if (!strcmp (p, "-Wno-multichar"))
754 else if (!strcmp (p, "-Wdiv-by-zero"))
755 warn_div_by_zero = 1;
756 else if (!strcmp (p, "-Wno-div-by-zero"))
757 warn_div_by_zero = 0;
758 else if (!strcmp (p, "-Wunknown-pragmas"))
759 /* Set to greater than 1, so that even unknown pragmas in system
760 headers will be warned about. */
761 warn_unknown_pragmas = 2;
762 else if (!strcmp (p, "-Wno-unknown-pragmas"))
763 warn_unknown_pragmas = 0;
764 else if (!strcmp (p, "-Wall"))
766 /* We save the value of warn_uninitialized, since if they put
767 -Wuninitialized on the command line, we need to generate a
768 warning about not using it without also specifying -O. */
769 if (warn_uninitialized != 1)
770 warn_uninitialized = 2;
771 warn_implicit_int = 1;
772 mesg_implicit_function_declaration = 1;
773 warn_return_type = 1;
777 warn_char_subscripts = 1;
778 warn_parentheses = 1;
779 warn_sequence_point = 1;
780 warn_missing_braces = 1;
781 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
782 it off only if it's not explicit. */
784 /* Only warn about unknown pragmas that are not in system headers. */
785 warn_unknown_pragmas = 1;
788 return strings_processed;
794 c_print_identifier (file, node, indent)
799 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
800 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
801 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
802 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
803 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
804 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
805 if (C_IS_RESERVED_WORD (node))
807 tree rid = ridpointers[C_RID_CODE (node)];
808 indent_to (file, indent + 4);
809 fprintf (file, "rid ");
810 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
811 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
815 /* Hook called at end of compilation to assume 1 elt
816 for a top-level tentative array defn that wasn't complete before. */
819 finish_incomplete_decl (decl)
822 if (TREE_CODE (decl) == VAR_DECL)
824 tree type = TREE_TYPE (decl);
825 if (type != error_mark_node
826 && TREE_CODE (type) == ARRAY_TYPE
827 && ! DECL_EXTERNAL (decl)
828 && TYPE_DOMAIN (type) == 0)
830 warning_with_decl (decl, "array `%s' assumed to have one element");
832 complete_array_type (type, NULL_TREE, 1);
834 layout_decl (decl, 0);
839 /* Create a new `struct binding_level'. */
841 static struct binding_level *
842 make_binding_level ()
845 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
848 /* Nonzero if we are currently in the global binding level. */
853 return current_binding_level == global_binding_level;
859 keep_next_level_flag = 1;
862 /* Nonzero if the current level needs to have a BLOCK made. */
867 return ((current_binding_level->keep_if_subblocks
868 && current_binding_level->blocks != 0)
869 || current_binding_level->keep
870 || current_binding_level->names != 0
871 || (current_binding_level->tags != 0
872 && !current_binding_level->tag_transparent));
875 /* Identify this binding level as a level of parameters.
876 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
877 But it turns out there is no way to pass the right value for
878 DEFINITION_FLAG, so we ignore it. */
881 declare_parm_level (definition_flag)
882 int definition_flag ATTRIBUTE_UNUSED;
884 current_binding_level->parm_flag = 1;
887 /* Nonzero if currently making parm declarations. */
892 return current_binding_level->parm_flag;
895 /* Enter a new binding level.
896 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
897 not for that of tags. */
900 pushlevel (tag_transparent)
903 struct binding_level *newlevel = NULL_BINDING_LEVEL;
905 /* If this is the top level of a function,
906 just make sure that NAMED_LABELS is 0. */
908 if (current_binding_level == global_binding_level)
913 /* Reuse or create a struct for this binding level. */
915 if (free_binding_level)
917 newlevel = free_binding_level;
918 free_binding_level = free_binding_level->level_chain;
922 newlevel = make_binding_level ();
925 /* Add this level to the front of the chain (stack) of levels that
928 *newlevel = clear_binding_level;
929 newlevel->tag_transparent
931 || (current_binding_level
932 ? current_binding_level->subblocks_tag_transparent
934 newlevel->level_chain = current_binding_level;
935 current_binding_level = newlevel;
936 newlevel->keep = keep_next_level_flag;
937 keep_next_level_flag = 0;
938 newlevel->keep_if_subblocks = keep_next_if_subblocks;
939 keep_next_if_subblocks = 0;
942 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
945 clear_limbo_values (block)
950 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
951 if (DECL_NAME (tem) != 0)
952 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
954 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
955 clear_limbo_values (tem);
958 /* Exit a binding level.
959 Pop the level off, and restore the state of the identifier-decl mappings
960 that were in effect when this level was entered.
962 If KEEP is nonzero, this level had explicit declarations, so
963 and create a "block" (a BLOCK node) for the level
964 to record its declarations and subblocks for symbol table output.
966 If FUNCTIONBODY is nonzero, this level is the body of a function,
967 so create a block as if KEEP were set and also clear out all
970 If REVERSE is nonzero, reverse the order of decls before putting
971 them into the BLOCK. */
974 poplevel (keep, reverse, functionbody)
980 /* The chain of decls was accumulated in reverse order.
981 Put it into forward order, just for cleanliness. */
983 tree tags = current_binding_level->tags;
984 tree subblocks = current_binding_level->blocks;
987 int block_previously_created;
989 keep |= current_binding_level->keep;
991 /* This warning is turned off because it causes warnings for
992 declarations like `extern struct foo *x'. */
994 /* Warn about incomplete structure types in this level. */
995 for (link = tags; link; link = TREE_CHAIN (link))
996 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
998 tree type = TREE_VALUE (link);
999 tree type_name = TYPE_NAME (type);
1000 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1002 : DECL_NAME (type_name));
1003 switch (TREE_CODE (type))
1006 error ("`struct %s' incomplete in scope ending here", id);
1009 error ("`union %s' incomplete in scope ending here", id);
1012 error ("`enum %s' incomplete in scope ending here", id);
1018 /* Get the decls in the order they were written.
1019 Usually current_binding_level->names is in reverse order.
1020 But parameter decls were previously put in forward order. */
1023 current_binding_level->names
1024 = decls = nreverse (current_binding_level->names);
1026 decls = current_binding_level->names;
1028 /* Output any nested inline functions within this block
1029 if they weren't already output. */
1031 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1032 if (TREE_CODE (decl) == FUNCTION_DECL
1033 && ! TREE_ASM_WRITTEN (decl)
1034 && DECL_INITIAL (decl) != 0
1035 && TREE_ADDRESSABLE (decl))
1037 /* If this decl was copied from a file-scope decl
1038 on account of a block-scope extern decl,
1039 propagate TREE_ADDRESSABLE to the file-scope decl.
1041 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1042 true, since then the decl goes through save_for_inline_copying. */
1043 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1044 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1045 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1048 /* We used to warn about unused variables in expand_end_bindings,
1049 i.e. while generating RTL. But in function-at-a-time mode we may
1050 choose to never expand a function at all (e.g. auto inlining), so
1051 we do this explicitly now. */
1052 warn_about_unused_variables (getdecls ());
1054 /* If there were any declarations or structure tags in that level,
1055 or if this level is a function body,
1056 create a BLOCK to record them for the life of this function. */
1059 block_previously_created = (current_binding_level->this_block != 0);
1060 if (block_previously_created)
1061 block = current_binding_level->this_block;
1062 else if (keep || functionbody
1063 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1064 block = make_node (BLOCK);
1067 BLOCK_VARS (block) = decls;
1068 BLOCK_SUBBLOCKS (block) = subblocks;
1071 /* In each subblock, record that this is its superior. */
1073 for (link = subblocks; link; link = TREE_CHAIN (link))
1074 BLOCK_SUPERCONTEXT (link) = block;
1076 /* Clear out the meanings of the local variables of this level. */
1078 for (link = decls; link; link = TREE_CHAIN (link))
1080 if (DECL_NAME (link) != 0)
1082 /* If the ident. was used or addressed via a local extern decl,
1083 don't forget that fact. */
1084 if (DECL_EXTERNAL (link))
1086 if (TREE_USED (link))
1087 TREE_USED (DECL_NAME (link)) = 1;
1088 if (TREE_ADDRESSABLE (link))
1089 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1091 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1095 /* Restore all name-meanings of the outer levels
1096 that were shadowed by this level. */
1098 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1099 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1101 /* If the level being exited is the top level of a function,
1102 check over all the labels, and clear out the current
1103 (function local) meanings of their names. */
1107 clear_limbo_values (block);
1109 /* If this is the top level block of a function,
1110 the vars are the function's parameters.
1111 Don't leave them in the BLOCK because they are
1112 found in the FUNCTION_DECL instead. */
1114 BLOCK_VARS (block) = 0;
1116 /* Clear out the definitions of all label names,
1117 since their scopes end here,
1118 and add them to BLOCK_VARS. */
1120 for (link = named_labels; link; link = TREE_CHAIN (link))
1122 tree label = TREE_VALUE (link);
1124 if (DECL_INITIAL (label) == 0)
1126 error_with_decl (label, "label `%s' used but not defined");
1127 /* Avoid crashing later. */
1128 define_label (input_filename, lineno,
1131 else if (warn_unused_label && !TREE_USED (label))
1132 warning_with_decl (label, "label `%s' defined but not used");
1133 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1135 /* Put the labels into the "variables" of the
1136 top-level block, so debugger can see them. */
1137 TREE_CHAIN (label) = BLOCK_VARS (block);
1138 BLOCK_VARS (block) = label;
1142 /* Pop the current level, and free the structure for reuse. */
1145 struct binding_level *level = current_binding_level;
1146 current_binding_level = current_binding_level->level_chain;
1148 level->level_chain = free_binding_level;
1149 free_binding_level = level;
1152 /* Dispose of the block that we just made inside some higher level. */
1154 DECL_INITIAL (current_function_decl) = block;
1157 if (!block_previously_created)
1158 current_binding_level->blocks
1159 = chainon (current_binding_level->blocks, block);
1161 /* If we did not make a block for the level just exited,
1162 any blocks made for inner levels
1163 (since they cannot be recorded as subblocks in that level)
1164 must be carried forward so they will later become subblocks
1165 of something else. */
1167 current_binding_level->blocks
1168 = chainon (current_binding_level->blocks, subblocks);
1170 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1171 binding contour so that they point to the appropriate construct, i.e.
1172 either to the current FUNCTION_DECL node, or else to the BLOCK node
1173 we just constructed.
1175 Note that for tagged types whose scope is just the formal parameter
1176 list for some function type specification, we can't properly set
1177 their TYPE_CONTEXTs here, because we don't have a pointer to the
1178 appropriate FUNCTION_TYPE node readily available to us. For those
1179 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1180 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1181 node which will represent the "scope" for these "parameter list local"
1185 for (link = tags; link; link = TREE_CHAIN (link))
1186 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1188 for (link = tags; link; link = TREE_CHAIN (link))
1189 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1192 TREE_USED (block) = 1;
1197 /* Insert BLOCK at the end of the list of subblocks of the
1198 current binding level. This is used when a BIND_EXPR is expanded,
1199 to handle the BLOCK node inside the BIND_EXPR. */
1202 insert_block (block)
1205 TREE_USED (block) = 1;
1206 current_binding_level->blocks
1207 = chainon (current_binding_level->blocks, block);
1210 /* Set the BLOCK node for the innermost scope
1211 (the one we are currently in). */
1217 current_binding_level->this_block = block;
1218 current_binding_level->names = chainon (current_binding_level->names,
1219 BLOCK_VARS (block));
1220 current_binding_level->blocks = chainon (current_binding_level->blocks,
1221 BLOCK_SUBBLOCKS (block));
1227 struct binding_level *newlevel;
1229 /* Reuse or create a struct for this binding level. */
1231 if (free_binding_level)
1233 newlevel = free_binding_level;
1234 free_binding_level = free_binding_level->level_chain;
1238 newlevel = make_binding_level ();
1241 /* Add this level to the front of the chain (stack) of label levels. */
1243 newlevel->level_chain = label_level_chain;
1244 label_level_chain = newlevel;
1246 newlevel->names = named_labels;
1247 newlevel->shadowed = shadowed_labels;
1249 shadowed_labels = 0;
1255 struct binding_level *level = label_level_chain;
1258 /* Clear out the definitions of the declared labels in this level.
1259 Leave in the list any ordinary, non-declared labels. */
1260 for (link = named_labels, prev = 0; link;)
1262 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1264 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1266 error_with_decl (TREE_VALUE (link),
1267 "label `%s' used but not defined");
1268 /* Avoid crashing later. */
1269 define_label (input_filename, lineno,
1270 DECL_NAME (TREE_VALUE (link)));
1272 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1273 warning_with_decl (TREE_VALUE (link),
1274 "label `%s' defined but not used");
1275 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1277 /* Delete this element from the list. */
1278 link = TREE_CHAIN (link);
1280 TREE_CHAIN (prev) = link;
1282 named_labels = link;
1287 link = TREE_CHAIN (link);
1291 /* Bring back all the labels that were shadowed. */
1292 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1293 if (DECL_NAME (TREE_VALUE (link)) != 0)
1294 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1295 = TREE_VALUE (link);
1297 named_labels = chainon (named_labels, level->names);
1298 shadowed_labels = level->shadowed;
1300 /* Pop the current level, and free the structure for reuse. */
1301 label_level_chain = label_level_chain->level_chain;
1302 level->level_chain = free_binding_level;
1303 free_binding_level = level;
1306 /* Push a definition or a declaration of struct, union or enum tag "name".
1307 "type" should be the type node.
1308 We assume that the tag "name" is not already defined.
1310 Note that the definition may really be just a forward reference.
1311 In that case, the TYPE_SIZE will be zero. */
1314 pushtag (name, type)
1317 struct binding_level *b;
1319 /* Find the proper binding level for this type tag. */
1321 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1326 /* Record the identifier as the type's name if it has none. */
1328 if (TYPE_NAME (type) == 0)
1329 TYPE_NAME (type) = name;
1332 b->tags = tree_cons (name, type, b->tags);
1334 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1335 tagged type we just added to the current binding level. This fake
1336 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1337 to output a representation of a tagged type, and it also gives
1338 us a convenient place to record the "scope start" address for the
1341 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1343 /* An approximation for now, so we can tell this is a function-scope tag.
1344 This will be updated in poplevel. */
1345 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1348 /* Handle when a new declaration NEWDECL
1349 has the same name as an old one OLDDECL
1350 in the same binding contour.
1351 Prints an error message if appropriate.
1353 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1354 Otherwise, return 0.
1356 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1357 and OLDDECL is in an outer binding level and should thus not be changed. */
1360 duplicate_decls (newdecl, olddecl, different_binding_level)
1361 tree newdecl, olddecl;
1362 int different_binding_level;
1364 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1365 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1366 && DECL_INITIAL (newdecl) != 0);
1367 tree oldtype = TREE_TYPE (olddecl);
1368 tree newtype = TREE_TYPE (newdecl);
1371 if (DECL_P (olddecl))
1373 if (TREE_CODE (newdecl) == FUNCTION_DECL
1374 && TREE_CODE (olddecl) == FUNCTION_DECL
1375 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1377 if (DECL_DECLARED_INLINE_P (newdecl)
1378 && DECL_UNINLINABLE (newdecl)
1379 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1380 /* Already warned elsewhere. */;
1381 else if (DECL_DECLARED_INLINE_P (olddecl)
1382 && DECL_UNINLINABLE (olddecl)
1383 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1384 /* Already warned. */;
1385 else if (DECL_DECLARED_INLINE_P (newdecl)
1386 && ! DECL_DECLARED_INLINE_P (olddecl)
1387 && DECL_UNINLINABLE (olddecl)
1388 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1390 warning_with_decl (newdecl,
1391 "function `%s' redeclared as inline");
1392 warning_with_decl (olddecl,
1393 "previous declaration of function `%s' with attribute noinline");
1395 else if (DECL_DECLARED_INLINE_P (olddecl)
1396 && DECL_UNINLINABLE (newdecl)
1397 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1399 warning_with_decl (newdecl,
1400 "function `%s' redeclared with attribute noinline");
1401 warning_with_decl (olddecl,
1402 "previous declaration of function `%s' was inline");
1406 DECL_ATTRIBUTES (newdecl)
1407 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1410 if (TREE_CODE (newtype) == ERROR_MARK
1411 || TREE_CODE (oldtype) == ERROR_MARK)
1414 /* New decl is completely inconsistent with the old one =>
1415 tell caller to replace the old one.
1416 This is always an error except in the case of shadowing a builtin. */
1417 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1419 if (TREE_CODE (olddecl) == FUNCTION_DECL
1420 && (DECL_BUILT_IN (olddecl)
1421 || DECL_BUILT_IN_NONANSI (olddecl)))
1423 /* If you declare a built-in or predefined function name as static,
1424 the old definition is overridden,
1425 but optionally warn this was a bad choice of name. */
1426 if (!TREE_PUBLIC (newdecl))
1430 else if (DECL_BUILT_IN (olddecl))
1431 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1433 warning_with_decl (newdecl, "shadowing library function `%s'");
1435 /* Likewise, if the built-in is not ansi, then programs can
1436 override it even globally without an error. */
1437 else if (! DECL_BUILT_IN (olddecl))
1438 warning_with_decl (newdecl,
1439 "library function `%s' declared as non-function");
1441 else if (DECL_BUILT_IN_NONANSI (olddecl))
1442 warning_with_decl (newdecl,
1443 "built-in function `%s' declared as non-function");
1445 warning_with_decl (newdecl,
1446 "built-in function `%s' declared as non-function");
1450 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1451 error_with_decl (olddecl, "previous declaration of `%s'");
1457 /* For real parm decl following a forward decl,
1458 return 1 so old decl will be reused. */
1459 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1460 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1463 /* The new declaration is the same kind of object as the old one.
1464 The declarations may partially match. Print warnings if they don't
1465 match enough. Ultimately, copy most of the information from the new
1466 decl to the old one, and keep using the old one. */
1468 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1469 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1470 && DECL_INITIAL (olddecl) == 0)
1471 /* If -traditional, avoid error for redeclaring fcn
1472 after implicit decl. */
1474 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && DECL_BUILT_IN (olddecl))
1477 /* A function declaration for a built-in function. */
1478 if (!TREE_PUBLIC (newdecl))
1480 /* If you declare a built-in function name as static, the
1481 built-in definition is overridden,
1482 but optionally warn this was a bad choice of name. */
1484 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1485 /* Discard the old built-in function. */
1488 else if (!types_match)
1490 /* Accept the return type of the new declaration if same modes. */
1491 tree oldreturntype = TREE_TYPE (oldtype);
1492 tree newreturntype = TREE_TYPE (newtype);
1494 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1496 /* Function types may be shared, so we can't just modify
1497 the return type of olddecl's function type. */
1499 = build_function_type (newreturntype,
1500 TYPE_ARG_TYPES (oldtype));
1501 trytype = build_type_attribute_variant (trytype,
1502 TYPE_ATTRIBUTES (oldtype));
1504 types_match = comptypes (newtype, trytype);
1508 /* Accept harmless mismatch in first argument type also.
1509 This is for the ffs and fprintf builtins. */
1510 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1511 && TYPE_ARG_TYPES (oldtype) != 0
1512 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1513 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1514 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1515 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1517 /* Function types may be shared, so we can't just modify
1518 the return type of olddecl's function type. */
1520 = build_function_type (TREE_TYPE (oldtype),
1521 tree_cons (NULL_TREE,
1522 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1523 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1524 trytype = build_type_attribute_variant (trytype,
1525 TYPE_ATTRIBUTES (oldtype));
1527 types_match = comptypes (newtype, trytype);
1531 if (! different_binding_level)
1532 TREE_TYPE (olddecl) = oldtype;
1536 /* If types don't match for a built-in, throw away the built-in. */
1537 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1541 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1542 && DECL_SOURCE_LINE (olddecl) == 0)
1544 /* A function declaration for a predeclared function
1545 that isn't actually built in. */
1546 if (!TREE_PUBLIC (newdecl))
1548 /* If you declare it as static, the
1549 default definition is overridden. */
1552 else if (!types_match)
1554 /* If the types don't match, preserve volatility indication.
1555 Later on, we will discard everything else about the
1556 default declaration. */
1557 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1560 /* Permit char *foo () to match void *foo (...) if not pedantic,
1561 if one of them came from a system header file. */
1562 else if (!types_match
1563 && TREE_CODE (olddecl) == FUNCTION_DECL
1564 && TREE_CODE (newdecl) == FUNCTION_DECL
1565 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1566 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1567 && (DECL_IN_SYSTEM_HEADER (olddecl)
1568 || DECL_IN_SYSTEM_HEADER (newdecl))
1569 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1570 && TYPE_ARG_TYPES (oldtype) == 0
1571 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1572 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1574 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1575 && TYPE_ARG_TYPES (newtype) == 0
1576 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1577 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1580 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1581 /* Make sure we keep void * as ret type, not char *. */
1582 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1583 TREE_TYPE (newdecl) = newtype = oldtype;
1585 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1586 we will come back here again. */
1587 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1589 else if (!types_match
1590 /* Permit char *foo (int, ...); followed by char *foo ();
1592 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1594 /* Return types must still match. */
1595 && comptypes (TREE_TYPE (oldtype),
1596 TREE_TYPE (newtype))
1597 && TYPE_ARG_TYPES (newtype) == 0))
1599 error_with_decl (newdecl, "conflicting types for `%s'");
1600 /* Check for function type mismatch
1601 involving an empty arglist vs a nonempty one. */
1602 if (TREE_CODE (olddecl) == FUNCTION_DECL
1603 && comptypes (TREE_TYPE (oldtype),
1604 TREE_TYPE (newtype))
1605 && ((TYPE_ARG_TYPES (oldtype) == 0
1606 && DECL_INITIAL (olddecl) == 0)
1608 (TYPE_ARG_TYPES (newtype) == 0
1609 && DECL_INITIAL (newdecl) == 0)))
1611 /* Classify the problem further. */
1612 tree t = TYPE_ARG_TYPES (oldtype);
1614 t = TYPE_ARG_TYPES (newtype);
1615 for (; t; t = TREE_CHAIN (t))
1617 tree type = TREE_VALUE (t);
1619 if (TREE_CHAIN (t) == 0
1620 && TYPE_MAIN_VARIANT (type) != void_type_node)
1622 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1626 if (simple_type_promotes_to (type) != NULL_TREE)
1628 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1633 error_with_decl (olddecl, "previous declaration of `%s'");
1637 errmsg = redeclaration_error_message (newdecl, olddecl);
1643 error_with_decl (newdecl, "redefinition of `%s'");
1646 error_with_decl (newdecl, "redeclaration of `%s'");
1649 error_with_decl (newdecl, "conflicting declarations of `%s'");
1655 error_with_decl (olddecl,
1656 ((DECL_INITIAL (olddecl)
1657 && current_binding_level == global_binding_level)
1658 ? "`%s' previously defined here"
1659 : "`%s' previously declared here"));
1661 else if (TREE_CODE (newdecl) == TYPE_DECL
1662 && (DECL_IN_SYSTEM_HEADER (olddecl)
1663 || DECL_IN_SYSTEM_HEADER (newdecl)))
1665 warning_with_decl (newdecl, "redefinition of `%s'");
1668 ((DECL_INITIAL (olddecl)
1669 && current_binding_level == global_binding_level)
1670 ? "`%s' previously defined here"
1671 : "`%s' previously declared here"));
1673 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1674 && DECL_INITIAL (olddecl) != 0
1675 && TYPE_ARG_TYPES (oldtype) == 0
1676 && TYPE_ARG_TYPES (newtype) != 0
1677 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1681 /* Prototype decl follows defn w/o prototype. */
1683 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1684 type = TYPE_ARG_TYPES (newtype),
1687 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1689 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1690 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1692 warning_with_decl (newdecl, "prototype for `%s' follows");
1693 warning_with_decl (olddecl, "non-prototype definition here");
1696 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1697 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1699 error_with_decl (newdecl,
1700 "prototype for `%s' follows and number of arguments doesn't match");
1701 error_with_decl (olddecl, "non-prototype definition here");
1705 /* Type for passing arg must be consistent
1706 with that declared for the arg. */
1707 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1708 /* If -traditional, allow `unsigned int' instead of `int'
1709 in the prototype. */
1710 && (! (flag_traditional
1711 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1712 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1714 error_with_decl (newdecl,
1715 "prototype for `%s' follows and argument %d doesn't match",
1717 error_with_decl (olddecl, "non-prototype definition here");
1723 /* Warn about mismatches in various flags. */
1726 /* Warn if function is now inline
1727 but was previously declared not inline and has been called. */
1728 if (TREE_CODE (olddecl) == FUNCTION_DECL
1729 && ! DECL_DECLARED_INLINE_P (olddecl)
1730 && DECL_DECLARED_INLINE_P (newdecl)
1731 && TREE_USED (olddecl))
1732 warning_with_decl (newdecl,
1733 "`%s' declared inline after being called");
1734 if (TREE_CODE (olddecl) == FUNCTION_DECL
1735 && ! DECL_DECLARED_INLINE_P (olddecl)
1736 && DECL_DECLARED_INLINE_P (newdecl)
1737 && DECL_INITIAL (olddecl) != 0)
1738 warning_with_decl (newdecl,
1739 "`%s' declared inline after its definition");
1741 /* If pedantic, warn when static declaration follows a non-static
1742 declaration. Otherwise, do so only for functions. */
1743 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1744 && TREE_PUBLIC (olddecl)
1745 && !TREE_PUBLIC (newdecl))
1746 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1748 /* If warn_traditional, warn when a non-static function
1749 declaration follows a static one. */
1750 if (warn_traditional && !in_system_header
1751 && TREE_CODE (olddecl) == FUNCTION_DECL
1752 && !TREE_PUBLIC (olddecl)
1753 && TREE_PUBLIC (newdecl))
1754 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1756 /* Warn when const declaration follows a non-const
1757 declaration, but not for functions. */
1758 if (TREE_CODE (olddecl) != FUNCTION_DECL
1759 && !TREE_READONLY (olddecl)
1760 && TREE_READONLY (newdecl))
1761 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1762 /* These bits are logically part of the type, for variables.
1763 But not for functions
1764 (where qualifiers are not valid ANSI anyway). */
1765 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1766 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1767 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1768 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1772 /* Optionally warn about more than one declaration for the same name. */
1773 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1774 /* Don't warn about a function declaration
1775 followed by a definition. */
1776 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1777 && DECL_INITIAL (olddecl) == 0)
1778 /* Don't warn about extern decl followed by (tentative) definition. */
1779 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1781 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1782 warning_with_decl (olddecl, "previous declaration of `%s'");
1785 /* Copy all the DECL_... slots specified in the new decl
1786 except for any that we copy here from the old type.
1788 Past this point, we don't change OLDTYPE and NEWTYPE
1789 even if we change the types of NEWDECL and OLDDECL. */
1793 /* When copying info to olddecl, we store into write_olddecl
1794 instead. This allows us to avoid modifying olddecl when
1795 different_binding_level is true. */
1796 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1798 /* Merge the data types specified in the two decls. */
1799 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1801 if (different_binding_level)
1803 if (TYPE_ARG_TYPES (oldtype) != 0
1804 && TYPE_ARG_TYPES (newtype) == 0)
1805 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1808 = build_type_attribute_variant
1810 merge_attributes (TYPE_ATTRIBUTES (newtype),
1811 TYPE_ATTRIBUTES (oldtype)));
1815 = TREE_TYPE (olddecl)
1816 = common_type (newtype, oldtype);
1819 /* Lay the type out, unless already done. */
1820 if (oldtype != TREE_TYPE (newdecl))
1822 if (TREE_TYPE (newdecl) != error_mark_node)
1823 layout_type (TREE_TYPE (newdecl));
1824 if (TREE_CODE (newdecl) != FUNCTION_DECL
1825 && TREE_CODE (newdecl) != TYPE_DECL
1826 && TREE_CODE (newdecl) != CONST_DECL)
1827 layout_decl (newdecl, 0);
1831 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1832 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1833 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1834 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1835 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1836 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1838 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1839 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1843 /* Keep the old rtl since we can safely use it. */
1844 COPY_DECL_RTL (olddecl, newdecl);
1846 /* Merge the type qualifiers. */
1847 if (TREE_CODE (olddecl) == FUNCTION_DECL
1848 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1849 && ! TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (write_olddecl) = 0;
1852 if (TREE_READONLY (newdecl))
1853 TREE_READONLY (write_olddecl) = 1;
1855 if (TREE_THIS_VOLATILE (newdecl))
1857 TREE_THIS_VOLATILE (write_olddecl) = 1;
1858 if (TREE_CODE (newdecl) == VAR_DECL
1859 /* If an automatic variable is re-declared in the same
1860 function scope, but the old declaration was not
1861 volatile, make_var_volatile() would crash because the
1862 variable would have been assigned to a pseudo, not a
1863 MEM. Since this duplicate declaration is invalid
1864 anyway, we just skip the call. */
1866 make_var_volatile (newdecl);
1869 /* Keep source location of definition rather than declaration. */
1870 /* When called with different_binding_level set, keep the old
1871 information so that meaningful diagnostics can be given. */
1872 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1873 && ! different_binding_level)
1875 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1876 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1879 /* Merge the unused-warning information. */
1880 if (DECL_IN_SYSTEM_HEADER (olddecl))
1881 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1882 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1883 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1885 /* Merge the initialization information. */
1886 /* When called with different_binding_level set, don't copy over
1887 DECL_INITIAL, so that we don't accidentally change function
1888 declarations into function definitions. */
1889 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1890 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1892 /* Merge the section attribute.
1893 We want to issue an error if the sections conflict but that must be
1894 done later in decl_attributes since we are called before attributes
1896 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1897 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1899 /* Copy the assembler name.
1900 Currently, it can only be defined in the prototype. */
1901 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1903 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1905 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1906 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1907 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1908 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1909 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1912 /* If cannot merge, then use the new type and qualifiers,
1913 and don't preserve the old rtl. */
1914 else if (! different_binding_level)
1916 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1917 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1918 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1919 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1922 /* Merge the storage class information. */
1923 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1924 /* For functions, static overrides non-static. */
1925 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1927 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1928 /* This is since we don't automatically
1929 copy the attributes of NEWDECL into OLDDECL. */
1930 /* No need to worry about different_binding_level here because
1931 then TREE_PUBLIC (newdecl) was true. */
1932 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1933 /* If this clears `static', clear it in the identifier too. */
1934 if (! TREE_PUBLIC (olddecl))
1935 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1937 if (DECL_EXTERNAL (newdecl))
1939 if (! different_binding_level)
1941 /* Don't mess with these flags on local externs; they remain
1942 external even if there's a declaration at file scope which
1944 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1945 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1947 /* An extern decl does not override previous storage class. */
1948 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1949 if (! DECL_EXTERNAL (newdecl))
1950 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1954 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1955 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1958 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1960 /* If we're redefining a function previously defined as extern
1961 inline, make sure we emit debug info for the inline before we
1962 throw it away, in case it was inlined into a function that hasn't
1963 been written out yet. */
1964 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1966 (*debug_hooks->outlining_inline_function) (olddecl);
1968 /* The new defn must not be inline. */
1969 DECL_INLINE (newdecl) = 0;
1970 DECL_UNINLINABLE (newdecl) = 1;
1974 /* If either decl says `inline', this fn is inline,
1975 unless its definition was passed already. */
1976 if (DECL_DECLARED_INLINE_P (newdecl)
1977 && DECL_DECLARED_INLINE_P (olddecl) == 0)
1978 DECL_DECLARED_INLINE_P (olddecl) = 1;
1980 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
1982 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1983 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1986 if (DECL_BUILT_IN (olddecl))
1988 /* Get rid of any built-in function if new arg types don't match it
1989 or if we have a function definition. */
1990 if (! types_match || new_is_definition)
1992 if (! different_binding_level)
1994 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1995 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2000 /* If redeclaring a builtin function, and not a definition,
2001 it stays built in. */
2002 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2003 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2006 /* Also preserve various other info from the definition. */
2007 else if (! new_is_definition)
2008 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2009 if (! new_is_definition)
2011 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2012 /* When called with different_binding_level set, don't copy over
2013 DECL_INITIAL, so that we don't accidentally change function
2014 declarations into function definitions. */
2015 if (! different_binding_level)
2016 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2017 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2018 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2019 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2020 if (DECL_INLINE (newdecl))
2021 DECL_ABSTRACT_ORIGIN (newdecl)
2022 = (different_binding_level
2023 ? DECL_ORIGIN (olddecl)
2024 : DECL_ABSTRACT_ORIGIN (olddecl));
2027 if (different_binding_level)
2030 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2031 But preserve OLDDECL's DECL_UID. */
2033 unsigned olddecl_uid = DECL_UID (olddecl);
2035 memcpy ((char *) olddecl + sizeof (struct tree_common),
2036 (char *) newdecl + sizeof (struct tree_common),
2037 sizeof (struct tree_decl) - sizeof (struct tree_common));
2038 DECL_UID (olddecl) = olddecl_uid;
2041 /* NEWDECL contains the merged attribute lists.
2042 Update OLDDECL to be the same. */
2043 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2048 /* Check whether decl-node X shadows an existing declaration.
2049 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
2050 which might be a NULL_TREE. */
2052 warn_if_shadowing (x, oldlocal)
2057 if (DECL_EXTERNAL (x))
2060 name = DECL_NAME (x);
2062 /* Warn if shadowing an argument at the top level of the body. */
2064 /* This warning doesn't apply to the parms of a nested fcn. */
2065 && ! current_binding_level->parm_flag
2066 /* Check that this is one level down from the parms. */
2067 && current_binding_level->level_chain->parm_flag
2068 /* Check that the decl being shadowed
2069 comes from the parm level, one level up. */
2070 && chain_member (oldlocal, current_binding_level->level_chain->names))
2072 if (TREE_CODE (oldlocal) == PARM_DECL)
2073 pedwarn ("declaration of `%s' shadows a parameter",
2074 IDENTIFIER_POINTER (name));
2076 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2077 IDENTIFIER_POINTER (name));
2079 /* Maybe warn if shadowing something else. */
2080 else if (warn_shadow
2081 /* No shadow warnings for internally generated vars. */
2082 && DECL_SOURCE_LINE (x) != 0
2083 /* No shadow warnings for vars made for inlining. */
2084 && ! DECL_FROM_INLINE (x))
2086 if (TREE_CODE (x) == PARM_DECL
2087 && current_binding_level->level_chain->parm_flag)
2088 /* Don't warn about the parm names in function declarator
2089 within a function declarator.
2090 It would be nice to avoid warning in any function
2091 declarator in a declaration, as opposed to a definition,
2092 but there is no way to tell it's not a definition. */
2096 if (TREE_CODE (oldlocal) == PARM_DECL)
2097 shadow_warning ("a parameter", name, oldlocal);
2099 shadow_warning ("a previous local", name, oldlocal);
2101 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2102 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2103 shadow_warning ("a global declaration", name,
2104 IDENTIFIER_GLOBAL_VALUE (name));
2108 /* Record a decl-node X as belonging to the current lexical scope.
2109 Check for errors (such as an incompatible declaration for the same
2110 name already seen in the same scope).
2112 Returns either X or an old decl for the same name.
2113 If an old decl is returned, it may have been smashed
2114 to agree with what X says. */
2121 tree name = DECL_NAME (x);
2122 struct binding_level *b = current_binding_level;
2124 /* Functions need the lang_decl data. */
2125 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2126 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2127 ggc_alloc_cleared (sizeof (struct lang_decl));
2129 DECL_CONTEXT (x) = current_function_decl;
2130 /* A local extern declaration for a function doesn't constitute nesting.
2131 A local auto declaration does, since it's a forward decl
2132 for a nested function coming later. */
2133 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2134 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2135 DECL_CONTEXT (x) = 0;
2139 int different_binding_level = 0;
2141 if (warn_nested_externs
2142 && DECL_EXTERNAL (x)
2143 && b != global_binding_level
2144 && x != IDENTIFIER_IMPLICIT_DECL (name)
2145 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2146 && !DECL_IN_SYSTEM_HEADER (x))
2147 warning ("nested extern declaration of `%s'",
2148 IDENTIFIER_POINTER (name));
2150 t = lookup_name_current_level (name);
2151 /* Don't type check externs here when -traditional. This is so that
2152 code with conflicting declarations inside blocks will get warnings
2153 not errors. X11 for instance depends on this. */
2154 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2156 t = lookup_name (name);
2157 /* Type decls at global scope don't conflict with externs declared
2158 inside lexical blocks. */
2159 if (t && TREE_CODE (t) == TYPE_DECL)
2161 different_binding_level = 1;
2163 if (t != 0 && t == error_mark_node)
2164 /* error_mark_node is 0 for a while during initialization! */
2167 error_with_decl (x, "`%s' used prior to declaration");
2170 /* If this decl is `static' and an implicit decl was seen previously,
2171 warn. But don't complain if -traditional,
2172 since traditional compilers don't complain. */
2173 if (! flag_traditional && TREE_PUBLIC (name)
2174 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2175 sets this for all functions. */
2176 && ! TREE_PUBLIC (x)
2177 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2178 /* We used to warn also for explicit extern followed by static,
2179 but sometimes you need to do it that way. */
2180 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2182 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2183 IDENTIFIER_POINTER (name));
2184 pedwarn_with_file_and_line
2185 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2186 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2187 "previous declaration of `%s'",
2188 IDENTIFIER_POINTER (name));
2189 TREE_THIS_VOLATILE (name) = 1;
2192 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2194 if (TREE_CODE (t) == PARM_DECL)
2196 /* Don't allow more than one "real" duplicate
2197 of a forward parm decl. */
2198 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2204 /* If we are processing a typedef statement, generate a whole new
2205 ..._TYPE node (which will be just an variant of the existing
2206 ..._TYPE node with identical properties) and then install the
2207 TYPE_DECL node generated to represent the typedef name as the
2208 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2210 The whole point here is to end up with a situation where each
2211 and every ..._TYPE node the compiler creates will be uniquely
2212 associated with AT MOST one node representing a typedef name.
2213 This way, even though the compiler substitutes corresponding
2214 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2215 early on, later parts of the compiler can always do the reverse
2216 translation and get back the corresponding typedef name. For
2219 typedef struct S MY_TYPE;
2222 Later parts of the compiler might only know that `object' was of
2223 type `struct S' if it were not for code just below. With this
2224 code however, later parts of the compiler see something like:
2226 struct S' == struct S
2227 typedef struct S' MY_TYPE;
2230 And they can then deduce (from the node for type struct S') that
2231 the original object declaration was:
2235 Being able to do this is important for proper support of protoize,
2236 and also for generating precise symbolic debugging information
2237 which takes full account of the programmer's (typedef) vocabulary.
2239 Obviously, we don't want to generate a duplicate ..._TYPE node if
2240 the TYPE_DECL node that we are now processing really represents a
2241 standard built-in type.
2243 Since all standard types are effectively declared at line zero
2244 in the source file, we can easily check to see if we are working
2245 on a standard type by checking the current value of lineno. */
2247 if (TREE_CODE (x) == TYPE_DECL)
2249 if (DECL_SOURCE_LINE (x) == 0)
2251 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2252 TYPE_NAME (TREE_TYPE (x)) = x;
2254 else if (TREE_TYPE (x) != error_mark_node
2255 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2257 tree tt = TREE_TYPE (x);
2258 DECL_ORIGINAL_TYPE (x) = tt;
2259 tt = build_type_copy (tt);
2261 TREE_USED (tt) = TREE_USED (x);
2266 /* Multiple external decls of the same identifier ought to match.
2267 Check against both global declarations (when traditional) and out of
2268 scope (limbo) block level declarations.
2270 We get warnings about inline functions where they are defined.
2271 Avoid duplicate warnings where they are used. */
2273 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2277 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2278 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2279 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2280 decl = IDENTIFIER_GLOBAL_VALUE (name);
2281 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2282 /* Decls in limbo are always extern, so no need to check that. */
2283 decl = IDENTIFIER_LIMBO_VALUE (name);
2287 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2288 /* If old decl is built-in, we already warned if we should. */
2289 && !DECL_BUILT_IN (decl))
2291 pedwarn_with_decl (x,
2292 "type mismatch with previous external decl");
2293 pedwarn_with_decl (decl, "previous external decl of `%s'");
2297 /* If a function has had an implicit declaration, and then is defined,
2298 make sure they are compatible. */
2300 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2301 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2302 && TREE_CODE (x) == FUNCTION_DECL
2303 && ! comptypes (TREE_TYPE (x),
2304 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2306 warning_with_decl (x, "type mismatch with previous implicit declaration");
2307 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2308 "previous implicit declaration of `%s'");
2311 /* In PCC-compatibility mode, extern decls of vars with no current decl
2312 take effect at top level no matter where they are. */
2313 if (flag_traditional && DECL_EXTERNAL (x)
2314 && lookup_name (name) == 0)
2316 tree type = TREE_TYPE (x);
2318 /* But don't do this if the type contains temporary nodes. */
2321 if (type == error_mark_node)
2323 if (TYPE_CONTEXT (type))
2325 warning_with_decl (x, "type of external `%s' is not global");
2326 /* By exiting the loop early, we leave TYPE nonzero,
2327 and thus prevent globalization of the decl. */
2330 else if (TREE_CODE (type) == FUNCTION_TYPE
2331 && TYPE_ARG_TYPES (type) != 0)
2332 /* The types might not be truly local,
2333 but the list of arg types certainly is temporary.
2334 Since prototypes are nontraditional,
2335 ok not to do the traditional thing. */
2337 type = TREE_TYPE (type);
2341 b = global_binding_level;
2344 /* This name is new in its binding level.
2345 Install the new declaration and return it. */
2346 if (b == global_binding_level)
2348 /* Install a global value. */
2350 /* If the first global decl has external linkage,
2351 warn if we later see static one. */
2352 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2353 TREE_PUBLIC (name) = 1;
2355 IDENTIFIER_GLOBAL_VALUE (name) = x;
2357 /* We no longer care about any previous block level declarations. */
2358 IDENTIFIER_LIMBO_VALUE (name) = 0;
2360 /* Don't forget if the function was used via an implicit decl. */
2361 if (IDENTIFIER_IMPLICIT_DECL (name)
2362 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2363 TREE_USED (x) = 1, TREE_USED (name) = 1;
2365 /* Don't forget if its address was taken in that way. */
2366 if (IDENTIFIER_IMPLICIT_DECL (name)
2367 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2368 TREE_ADDRESSABLE (x) = 1;
2370 /* Warn about mismatches against previous implicit decl. */
2371 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2372 /* If this real decl matches the implicit, don't complain. */
2373 && ! (TREE_CODE (x) == FUNCTION_DECL
2374 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2375 == integer_type_node)))
2376 pedwarn ("`%s' was previously implicitly declared to return `int'",
2377 IDENTIFIER_POINTER (name));
2379 /* If this decl is `static' and an `extern' was seen previously,
2380 that is erroneous. */
2381 if (TREE_PUBLIC (name)
2382 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2384 /* Okay to redeclare an ANSI built-in as static. */
2385 if (t != 0 && DECL_BUILT_IN (t))
2387 /* Okay to declare a non-ANSI built-in as anything. */
2388 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2390 /* Okay to have global type decl after an earlier extern
2391 declaration inside a lexical block. */
2392 else if (TREE_CODE (x) == TYPE_DECL)
2394 else if (IDENTIFIER_IMPLICIT_DECL (name))
2396 if (! TREE_THIS_VOLATILE (name))
2397 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2398 IDENTIFIER_POINTER (name));
2401 pedwarn ("`%s' was declared `extern' and later `static'",
2402 IDENTIFIER_POINTER (name));
2407 /* Here to install a non-global value. */
2408 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2409 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2411 IDENTIFIER_LOCAL_VALUE (name) = x;
2413 /* If this is an extern function declaration, see if we
2414 have a global definition or declaration for the function. */
2417 && TREE_CODE (x) == FUNCTION_DECL
2418 && TREE_CODE (oldglobal) == FUNCTION_DECL
2419 && DECL_EXTERNAL (x)
2420 && ! DECL_DECLARED_INLINE_P (x))
2422 /* We have one. Their types must agree. */
2423 if (! comptypes (TREE_TYPE (x),
2424 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2425 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2428 /* Inner extern decl is inline if global one is.
2429 Copy enough to really inline it. */
2430 if (DECL_DECLARED_INLINE_P (oldglobal))
2432 DECL_DECLARED_INLINE_P (x)
2433 = DECL_DECLARED_INLINE_P (oldglobal);
2434 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2435 DECL_INITIAL (x) = (current_function_decl == oldglobal
2436 ? 0 : DECL_INITIAL (oldglobal));
2437 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2438 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2439 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2440 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2441 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2442 DECL_ABSTRACT_ORIGIN (x)
2443 = DECL_ABSTRACT_ORIGIN (oldglobal);
2445 /* Inner extern decl is built-in if global one is. */
2446 if (DECL_BUILT_IN (oldglobal))
2448 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2449 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2451 /* Keep the arg types from a file-scope fcn defn. */
2452 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2453 && DECL_INITIAL (oldglobal)
2454 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2455 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2460 /* This case is probably sometimes the right thing to do. */
2461 /* If we have a local external declaration,
2462 then any file-scope declaration should not
2463 have been static. */
2464 if (oldlocal == 0 && oldglobal != 0
2465 && !TREE_PUBLIC (oldglobal)
2466 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2467 warning ("`%s' locally external but globally static",
2468 IDENTIFIER_POINTER (name));
2471 /* If we have a local external declaration,
2472 and no file-scope declaration has yet been seen,
2473 then if we later have a file-scope decl it must not be static. */
2475 && DECL_EXTERNAL (x)
2479 TREE_PUBLIC (name) = 1;
2481 /* Save this decl, so that we can do type checking against
2482 other decls after it falls out of scope.
2484 Only save it once. This prevents temporary decls created in
2485 expand_inline_function from being used here, since this
2486 will have been set when the inline function was parsed.
2487 It also helps give slightly better warnings. */
2488 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2489 IDENTIFIER_LIMBO_VALUE (name) = x;
2492 warn_if_shadowing (x, oldlocal);
2494 /* If storing a local value, there may already be one (inherited).
2495 If so, record it for restoration when this binding level ends. */
2497 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2500 /* Keep count of variables in this level with incomplete type.
2501 If the input is erroneous, we can have error_mark in the type
2502 slot (e.g. "f(void a, ...)") - that doesn't count as an
2504 if (TREE_TYPE (x) != error_mark_node
2505 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2507 tree element = TREE_TYPE (x);
2509 while (TREE_CODE (element) == ARRAY_TYPE)
2510 element = TREE_TYPE (element);
2511 if (TREE_CODE (element) == RECORD_TYPE
2512 || TREE_CODE (element) == UNION_TYPE)
2517 /* Put decls on list in reverse order.
2518 We will reverse them later if necessary. */
2519 TREE_CHAIN (x) = b->names;
2525 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2528 pushdecl_top_level (x)
2532 struct binding_level *b = current_binding_level;
2534 current_binding_level = global_binding_level;
2536 current_binding_level = b;
2540 /* Generate an implicit declaration for identifier FUNCTIONID
2541 as a function of type int (). Print a warning if appropriate. */
2544 implicitly_declare (functionid)
2548 int traditional_warning = 0;
2549 /* Only one "implicit declaration" warning per identifier. */
2550 int implicit_warning;
2552 /* We used to reuse an old implicit decl here,
2553 but this loses with inline functions because it can clobber
2554 the saved decl chains. */
2556 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2557 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2560 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2562 /* Warn of implicit decl following explicit local extern decl.
2563 This is probably a program designed for traditional C. */
2564 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2565 traditional_warning = 1;
2567 /* Warn once of an implicit declaration. */
2568 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2570 DECL_EXTERNAL (decl) = 1;
2571 TREE_PUBLIC (decl) = 1;
2573 /* Record that we have an implicit decl and this is it. */
2574 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2576 /* ANSI standard says implicit declarations are in the innermost block.
2577 So we record the decl in the standard fashion.
2578 If flag_traditional is set, pushdecl does it top-level. */
2581 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2582 maybe_objc_check_decl (decl);
2584 rest_of_decl_compilation (decl, NULL, 0, 0);
2586 if (implicit_warning)
2587 implicit_decl_warning (functionid);
2588 else if (warn_traditional && traditional_warning)
2589 warning ("function `%s' was previously declared within a block",
2590 IDENTIFIER_POINTER (functionid));
2592 /* Write a record describing this implicit function declaration to the
2593 prototypes file (if requested). */
2595 gen_aux_info_record (decl, 0, 1, 0);
2597 /* Possibly apply some default attributes to this implicit declaration. */
2598 decl_attributes (&decl, NULL_TREE, 0);
2604 implicit_decl_warning (id)
2607 const char *name = IDENTIFIER_POINTER (id);
2608 if (mesg_implicit_function_declaration == 2)
2609 error ("implicit declaration of function `%s'", name);
2610 else if (mesg_implicit_function_declaration == 1)
2611 warning ("implicit declaration of function `%s'", name);
2614 /* Return zero if the declaration NEWDECL is valid
2615 when the declaration OLDDECL (assumed to be for the same name)
2616 has already been seen.
2617 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2618 and 3 if it is a conflicting declaration. */
2621 redeclaration_error_message (newdecl, olddecl)
2622 tree newdecl, olddecl;
2624 if (TREE_CODE (newdecl) == TYPE_DECL)
2626 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2628 /* pushdecl creates distinct types for TYPE_DECLs by calling
2629 build_type_copy, so the above comparison generally fails. We do
2630 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2631 is equivalent to what this code used to do before the build_type_copy
2632 call. The variant type distinction should not matter for traditional
2633 code, because it doesn't have type qualifiers. */
2634 if (flag_traditional
2635 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2637 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2641 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2643 /* Declarations of functions can insist on internal linkage
2644 but they can't be inconsistent with internal linkage,
2645 so there can be no error on that account.
2646 However defining the same name twice is no good. */
2647 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2648 /* However, defining once as extern inline and a second
2649 time in another way is ok. */
2650 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2651 && ! (DECL_DECLARED_INLINE_P (newdecl)
2652 && DECL_EXTERNAL (newdecl))))
2656 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2658 /* Objects declared at top level: */
2659 /* If at least one is a reference, it's ok. */
2660 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2662 /* Reject two definitions. */
2663 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2665 /* Now we have two tentative defs, or one tentative and one real def. */
2666 /* Insist that the linkage match. */
2667 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2671 else if (current_binding_level->parm_flag
2672 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2676 /* Newdecl has block scope. If olddecl has block scope also, then
2677 reject two definitions, and reject a definition together with an
2678 external reference. Otherwise, it is OK, because newdecl must
2679 be an extern reference to olddecl. */
2680 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2681 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2687 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2688 Create one if none exists so far for the current function.
2689 This function is called for both label definitions and label references. */
2695 tree decl = IDENTIFIER_LABEL_VALUE (id);
2697 if (current_function_decl == 0)
2699 error ("label %s referenced outside of any function",
2700 IDENTIFIER_POINTER (id));
2704 /* Use a label already defined or ref'd with this name. */
2707 /* But not if it is inherited and wasn't declared to be inheritable. */
2708 if (DECL_CONTEXT (decl) != current_function_decl
2709 && ! C_DECLARED_LABEL_FLAG (decl))
2710 return shadow_label (id);
2714 decl = build_decl (LABEL_DECL, id, void_type_node);
2716 /* A label not explicitly declared must be local to where it's ref'd. */
2717 DECL_CONTEXT (decl) = current_function_decl;
2719 DECL_MODE (decl) = VOIDmode;
2721 /* Say where one reference is to the label,
2722 for the sake of the error if it is not defined. */
2723 DECL_SOURCE_LINE (decl) = lineno;
2724 DECL_SOURCE_FILE (decl) = input_filename;
2726 IDENTIFIER_LABEL_VALUE (id) = decl;
2728 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2733 /* Make a label named NAME in the current function,
2734 shadowing silently any that may be inherited from containing functions
2735 or containing scopes.
2737 Note that valid use, if the label being shadowed
2738 comes from another scope in the same function,
2739 requires calling declare_nonlocal_label right away. */
2745 tree decl = IDENTIFIER_LABEL_VALUE (name);
2751 /* Check to make sure that the label hasn't already been declared
2752 at this label scope */
2753 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2754 if (TREE_VALUE (dup) == decl)
2756 error ("duplicate label declaration `%s'",
2757 IDENTIFIER_POINTER (name));
2758 error_with_decl (TREE_VALUE (dup),
2759 "this is a previous declaration");
2760 /* Just use the previous declaration. */
2761 return lookup_label (name);
2764 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2765 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2768 return lookup_label (name);
2771 /* Define a label, specifying the location in the source file.
2772 Return the LABEL_DECL node for the label, if the definition is valid.
2773 Otherwise return 0. */
2776 define_label (filename, line, name)
2777 const char *filename;
2781 tree decl = lookup_label (name);
2783 /* If label with this name is known from an outer context, shadow it. */
2784 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2786 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2787 IDENTIFIER_LABEL_VALUE (name) = 0;
2788 decl = lookup_label (name);
2791 if (warn_traditional && !in_system_header && lookup_name (name))
2792 warning_with_file_and_line (filename, line,
2793 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2794 IDENTIFIER_POINTER (name));
2796 if (DECL_INITIAL (decl) != 0)
2798 error_with_file_and_line (filename, line, "duplicate label `%s'",
2799 IDENTIFIER_POINTER (name));
2804 /* Mark label as having been defined. */
2805 DECL_INITIAL (decl) = error_mark_node;
2806 /* Say where in the source. */
2807 DECL_SOURCE_FILE (decl) = filename;
2808 DECL_SOURCE_LINE (decl) = line;
2813 /* Return the list of declarations of the current level.
2814 Note that this list is in reverse order unless/until
2815 you nreverse it; and when you do nreverse it, you must
2816 store the result back using `storedecls' or you will lose. */
2821 return current_binding_level->names;
2824 /* Return the list of type-tags (for structs, etc) of the current level. */
2829 return current_binding_level->tags;
2832 /* Store the list of declarations of the current level.
2833 This is done for the parameter declarations of a function being defined,
2834 after they are modified in the light of any missing parameters. */
2840 current_binding_level->names = decls;
2843 /* Similarly, store the list of tags of the current level. */
2849 current_binding_level->tags = tags;
2852 /* Given NAME, an IDENTIFIER_NODE,
2853 return the structure (or union or enum) definition for that name.
2854 Searches binding levels from BINDING_LEVEL up to the global level.
2855 If THISLEVEL_ONLY is nonzero, searches only the specified context
2856 (but skips any tag-transparent contexts to find one that is
2857 meaningful for tags).
2858 CODE says which kind of type the caller wants;
2859 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2860 If the wrong kind of type is found, an error is reported. */
2863 lookup_tag (code, name, binding_level, thislevel_only)
2864 enum tree_code code;
2865 struct binding_level *binding_level;
2869 struct binding_level *level;
2872 for (level = binding_level; level; level = level->level_chain)
2875 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2877 if (TREE_PURPOSE (tail) == name)
2879 if (TREE_CODE (TREE_VALUE (tail)) != code)
2881 /* Definition isn't the kind we were looking for. */
2882 pending_invalid_xref = name;
2883 pending_invalid_xref_file = input_filename;
2884 pending_invalid_xref_line = lineno;
2885 /* If in the same binding level as a declaration as a tag
2886 of a different type, this must not be allowed to
2887 shadow that tag, so give the error immediately.
2888 (For example, "struct foo; union foo;" is invalid.) */
2890 pending_xref_error ();
2892 return TREE_VALUE (tail);
2895 if (! level->tag_transparent)
2905 /* Print an error message now
2906 for a recent invalid struct, union or enum cross reference.
2907 We don't print them immediately because they are not invalid
2908 when used in the `struct foo;' construct for shadowing. */
2911 pending_xref_error ()
2913 if (pending_invalid_xref != 0)
2914 error_with_file_and_line (pending_invalid_xref_file,
2915 pending_invalid_xref_line,
2916 "`%s' defined as wrong kind of tag",
2917 IDENTIFIER_POINTER (pending_invalid_xref));
2918 pending_invalid_xref = 0;
2921 /* Given a type, find the tag that was defined for it and return the tag name.
2922 Otherwise return 0. */
2925 lookup_tag_reverse (type)
2928 struct binding_level *level;
2930 for (level = current_binding_level; level; level = level->level_chain)
2933 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2935 if (TREE_VALUE (tail) == type)
2936 return TREE_PURPOSE (tail);
2942 /* Look up NAME in the current binding level and its superiors
2943 in the namespace of variables, functions and typedefs.
2944 Return a ..._DECL node of some kind representing its definition,
2945 or return 0 if it is undefined. */
2953 if (current_binding_level != global_binding_level
2954 && IDENTIFIER_LOCAL_VALUE (name))
2955 val = IDENTIFIER_LOCAL_VALUE (name);
2957 val = IDENTIFIER_GLOBAL_VALUE (name);
2961 /* Similar to `lookup_name' but look only at current binding level. */
2964 lookup_name_current_level (name)
2969 if (current_binding_level == global_binding_level)
2970 return IDENTIFIER_GLOBAL_VALUE (name);
2972 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2975 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2976 if (DECL_NAME (t) == name)
2982 /* Mark ARG for GC. */
2985 mark_binding_level (arg)
2988 struct binding_level *level = *(struct binding_level **) arg;
2990 for (; level != 0; level = level->level_chain)
2992 ggc_mark_tree (level->names);
2993 ggc_mark_tree (level->tags);
2994 ggc_mark_tree (level->shadowed);
2995 ggc_mark_tree (level->blocks);
2996 ggc_mark_tree (level->this_block);
2997 ggc_mark_tree (level->parm_order);
3001 /* Create the predefined scalar types of C,
3002 and some nodes representing standard constants (0, 1, (void *) 0).
3003 Initialize the global binding level.
3004 Make definitions for built-in primitive functions. */
3007 c_init_decl_processing ()
3010 tree ptr_ftype_void, ptr_ftype_ptr;
3012 /* Adds some ggc roots, and reserved words for c-parse.in. */
3015 current_function_decl = NULL;
3016 named_labels = NULL;
3017 current_binding_level = NULL_BINDING_LEVEL;
3018 free_binding_level = NULL_BINDING_LEVEL;
3020 /* Make the binding_level structure for global names. */
3022 global_binding_level = current_binding_level;
3024 build_common_tree_nodes (flag_signed_char);
3026 c_common_nodes_and_builtins ();
3028 boolean_type_node = integer_type_node;
3029 boolean_true_node = integer_one_node;
3030 boolean_false_node = integer_zero_node;
3032 /* With GCC, C99's _Bool is always of size 1. */
3033 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3034 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3035 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3036 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3037 TYPE_PRECISION (c_bool_type_node) = 1;
3038 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3040 c_bool_false_node = build_int_2 (0, 0);
3041 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3042 c_bool_true_node = build_int_2 (1, 0);
3043 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3045 endlink = void_list_node;
3046 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3048 = build_function_type (ptr_type_node,
3049 tree_cons (NULL_TREE, ptr_type_node, endlink));
3051 /* Types which are common to the fortran compiler and libf2c. When
3052 changing these, you also need to be concerned with f/com.h. */
3054 if (TYPE_PRECISION (float_type_node)
3055 == TYPE_PRECISION (long_integer_type_node))
3057 g77_integer_type_node = long_integer_type_node;
3058 g77_uinteger_type_node = long_unsigned_type_node;
3060 else if (TYPE_PRECISION (float_type_node)
3061 == TYPE_PRECISION (integer_type_node))
3063 g77_integer_type_node = integer_type_node;
3064 g77_uinteger_type_node = unsigned_type_node;
3067 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3069 if (g77_integer_type_node != NULL_TREE)
3071 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3072 g77_integer_type_node));
3073 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3074 g77_uinteger_type_node));
3077 if (TYPE_PRECISION (float_type_node) * 2
3078 == TYPE_PRECISION (long_integer_type_node))
3080 g77_longint_type_node = long_integer_type_node;
3081 g77_ulongint_type_node = long_unsigned_type_node;
3083 else if (TYPE_PRECISION (float_type_node) * 2
3084 == TYPE_PRECISION (long_long_integer_type_node))
3086 g77_longint_type_node = long_long_integer_type_node;
3087 g77_ulongint_type_node = long_long_unsigned_type_node;
3090 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3092 if (g77_longint_type_node != NULL_TREE)
3094 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3095 g77_longint_type_node));
3096 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3097 g77_ulongint_type_node));
3100 pedantic_lvalues = pedantic;
3102 make_fname_decl = c_make_fname_decl;
3103 start_fname_decls ();
3105 incomplete_decl_finalize_hook = finish_incomplete_decl;
3107 /* Record our roots. */
3109 ggc_add_tree_root (c_global_trees, CTI_MAX);
3110 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3111 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3112 ggc_add_tree_root (&named_labels, 1);
3113 ggc_add_tree_root (&shadowed_labels, 1);
3114 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3115 mark_binding_level);
3116 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3117 mark_binding_level);
3118 ggc_add_tree_root (&static_ctors, 1);
3119 ggc_add_tree_root (&static_dtors, 1);
3122 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3123 decl, NAME is the initialization string and TYPE_DEP indicates whether
3124 NAME depended on the type of the function. As we don't yet implement
3125 delayed emission of static data, we mark the decl as emitted
3126 so it is not placed in the output. Anything using it must therefore pull
3127 out the STRING_CST initializer directly. This does mean that these names
3128 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3131 c_make_fname_decl (id, type_dep)
3135 const char *name = fname_as_string (type_dep);
3136 tree decl, type, init;
3137 size_t length = strlen (name);
3139 type = build_array_type
3140 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3141 build_index_type (size_int (length)));
3143 decl = build_decl (VAR_DECL, id, type);
3144 /* We don't push the decl, so have to set its context here. */
3145 DECL_CONTEXT (decl) = current_function_decl;
3147 TREE_STATIC (decl) = 1;
3148 TREE_READONLY (decl) = 1;
3149 DECL_ARTIFICIAL (decl) = 1;
3151 init = build_string (length + 1, name);
3152 TREE_TYPE (init) = type;
3153 DECL_INITIAL (decl) = init;
3155 TREE_USED (decl) = 1;
3157 finish_decl (decl, init, NULL_TREE);
3162 /* Return a definition for a builtin function named NAME and whose data type
3163 is TYPE. TYPE should be a function type with argument types.
3164 FUNCTION_CODE tells later passes how to compile calls to this function.
3165 See tree.h for its possible values.
3167 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3168 the name to be called if we can't opencode the function. */
3171 builtin_function (name, type, function_code, class, library_name)
3175 enum built_in_class class;
3176 const char *library_name;
3178 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3179 DECL_EXTERNAL (decl) = 1;
3180 TREE_PUBLIC (decl) = 1;
3181 /* If -traditional, permit redefining a builtin function any way you like.
3182 (Though really, if the program redefines these functions,
3183 it probably won't work right unless compiled with -fno-builtin.) */
3184 if (flag_traditional && name[0] != '_')
3185 DECL_BUILT_IN_NONANSI (decl) = 1;
3187 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3188 make_decl_rtl (decl, NULL);
3190 DECL_BUILT_IN_CLASS (decl) = class;
3191 DECL_FUNCTION_CODE (decl) = function_code;
3193 /* Warn if a function in the namespace for users
3194 is used without an occasion to consider it declared. */
3195 if (name[0] != '_' || name[1] != '_')
3196 C_DECL_ANTICIPATED (decl) = 1;
3198 /* Possibly apply some default attributes to this built-in function. */
3199 decl_attributes (&decl, NULL_TREE, 0);
3204 /* Apply default attributes to a function, if a system function with default
3208 insert_default_attributes (decl)
3211 if (!TREE_PUBLIC (decl))
3213 c_common_insert_default_attributes (decl);
3216 /* Called when a declaration is seen that contains no names to declare.
3217 If its type is a reference to a structure, union or enum inherited
3218 from a containing scope, shadow that tag name for the current scope
3219 with a forward reference.
3220 If its type defines a new named structure or union
3221 or defines an enum, it is valid but we need not do anything here.
3222 Otherwise, it is an error. */
3225 shadow_tag (declspecs)
3228 shadow_tag_warned (declspecs, 0);
3232 shadow_tag_warned (declspecs, warned)
3235 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3242 pending_invalid_xref = 0;
3244 /* Remove the attributes from declspecs, since they will confuse the
3246 split_specs_attrs (declspecs, &specs, &attrs);
3248 for (link = specs; link; link = TREE_CHAIN (link))
3250 tree value = TREE_VALUE (link);
3251 enum tree_code code = TREE_CODE (value);
3253 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3254 /* Used to test also that TYPE_SIZE (value) != 0.
3255 That caused warning for `struct foo;' at top level in the file. */
3257 tree name = lookup_tag_reverse (value);
3264 if (warned != 1 && code != ENUMERAL_TYPE)
3265 /* Empty unnamed enum OK */
3267 pedwarn ("unnamed struct/union that defines no instances");
3273 t = lookup_tag (code, name, current_binding_level, 1);
3277 t = make_node (code);
3284 if (!warned && ! in_system_header)
3286 warning ("useless keyword or type name in empty declaration");
3293 error ("two types specified in one empty declaration");
3298 pedwarn ("empty declaration");
3302 /* Construct an array declarator. EXPR is the expression inside [], or
3303 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3304 to the pointer to which a parameter array is converted). STATIC_P is
3305 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3306 is non-zero is the array is [*], a VLA of unspecified length which is
3307 nevertheless a complete type (not currently implemented by GCC),
3308 zero otherwise. The declarator is constructed as an ARRAY_REF
3309 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3310 left of the [] (filled by in set_array_declarator_type) and operand 1
3311 is the expression inside; whose TREE_TYPE is the type qualifiers and
3312 which has TREE_STATIC set if "static" is used. */
3315 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3322 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3323 TREE_TYPE (decl) = quals;
3324 TREE_STATIC (decl) = (static_p ? 1 : 0);
3325 if (pedantic && !flag_isoc99)
3327 if (static_p || quals != NULL_TREE)
3328 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3330 pedwarn ("ISO C89 does not support `[*]' array declarators");
3333 warning ("GCC does not yet properly implement `[*]' array declarators");
3337 /* Set the type of an array declarator. DECL is the declarator, as
3338 constructed by build_array_declarator; TYPE is what appears on the left
3339 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3340 abstract declarator, zero otherwise; this is used to reject static and
3341 type qualifiers in abstract declarators, where they are not in the
3345 set_array_declarator_type (decl, type, abstract_p)
3350 TREE_OPERAND (decl, 0) = type;
3351 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3352 error ("static or type qualifiers in abstract declarator");
3356 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3359 groktypename (typename)
3362 if (TREE_CODE (typename) != TREE_LIST)
3364 return grokdeclarator (TREE_VALUE (typename),
3365 TREE_PURPOSE (typename),
3369 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3372 groktypename_in_parm_context (typename)
3375 if (TREE_CODE (typename) != TREE_LIST)
3377 return grokdeclarator (TREE_VALUE (typename),
3378 TREE_PURPOSE (typename),
3382 /* Decode a declarator in an ordinary declaration or data definition.
3383 This is called as soon as the type information and variable name
3384 have been parsed, before parsing the initializer if any.
3385 Here we create the ..._DECL node, fill in its type,
3386 and put it on the list of decls for the current context.
3387 The ..._DECL node is returned as the value.
3389 Exception: for arrays where the length is not specified,
3390 the type is left null, to be filled in by `finish_decl'.
3392 Function definitions do not come here; they go to start_function
3393 instead. However, external and forward declarations of functions
3394 do go through here. Structure field declarations are done by
3395 grokfield and not through here. */
3398 start_decl (declarator, declspecs, initialized, attributes)
3399 tree declarator, declspecs;
3403 tree decl = grokdeclarator (declarator, declspecs,
3404 NORMAL, initialized);
3407 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3408 && MAIN_NAME_P (DECL_NAME (decl)))
3409 warning_with_decl (decl, "`%s' is usually a function");
3412 /* Is it valid for this decl to have an initializer at all?
3413 If not, set INITIALIZED to zero, which will indirectly
3414 tell `finish_decl' to ignore the initializer once it is parsed. */
3415 switch (TREE_CODE (decl))
3418 /* typedef foo = bar means give foo the same type as bar.
3419 We haven't parsed bar yet, so `finish_decl' will fix that up.
3420 Any other case of an initialization in a TYPE_DECL is an error. */
3421 if (pedantic || list_length (declspecs) > 1)
3423 error ("typedef `%s' is initialized",
3424 IDENTIFIER_POINTER (DECL_NAME (decl)));
3430 error ("function `%s' is initialized like a variable",
3431 IDENTIFIER_POINTER (DECL_NAME (decl)));
3436 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3437 error ("parameter `%s' is initialized",
3438 IDENTIFIER_POINTER (DECL_NAME (decl)));
3443 /* Don't allow initializations for incomplete types
3444 except for arrays which might be completed by the initialization. */
3446 /* This can happen if the array size is an undefined macro. We already
3447 gave a warning, so we don't need another one. */
3448 if (TREE_TYPE (decl) == error_mark_node)
3450 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3452 /* A complete type is ok if size is fixed. */
3454 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3455 || C_DECL_VARIABLE_SIZE (decl))
3457 error ("variable-sized object may not be initialized");
3461 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3463 error ("variable `%s' has initializer but incomplete type",
3464 IDENTIFIER_POINTER (DECL_NAME (decl)));
3467 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3469 error ("elements of array `%s' have incomplete type",
3470 IDENTIFIER_POINTER (DECL_NAME (decl)));
3478 /* Seems redundant with grokdeclarator. */
3479 if (current_binding_level != global_binding_level
3480 && DECL_EXTERNAL (decl)
3481 && TREE_CODE (decl) != FUNCTION_DECL)
3482 warning ("declaration of `%s' has `extern' and is initialized",
3483 IDENTIFIER_POINTER (DECL_NAME (decl)));
3485 DECL_EXTERNAL (decl) = 0;
3486 if (current_binding_level == global_binding_level)
3487 TREE_STATIC (decl) = 1;
3489 /* Tell `pushdecl' this is an initialized decl
3490 even though we don't yet have the initializer expression.
3491 Also tell `finish_decl' it may store the real initializer. */
3492 DECL_INITIAL (decl) = error_mark_node;
3495 /* If this is a function declaration, write a record describing it to the
3496 prototypes file (if requested). */
3498 if (TREE_CODE (decl) == FUNCTION_DECL)
3499 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3501 /* ANSI specifies that a tentative definition which is not merged with
3502 a non-tentative definition behaves exactly like a definition with an
3503 initializer equal to zero. (Section 3.7.2)
3504 -fno-common gives strict ANSI behavior. Usually you don't want it.
3505 This matters only for variables with external linkage. */
3506 if (! flag_no_common || ! TREE_PUBLIC (decl))
3507 DECL_COMMON (decl) = 1;
3509 /* Set attributes here so if duplicate decl, will have proper attributes. */
3510 decl_attributes (&decl, attributes, 0);
3512 if (TREE_CODE (decl) == FUNCTION_DECL
3513 && DECL_DECLARED_INLINE_P (decl)
3514 && DECL_UNINLINABLE (decl)
3515 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3516 warning_with_decl (decl,
3517 "inline function `%s' given attribute noinline");
3519 /* Add this decl to the current binding level.
3520 TEM may equal DECL or it may be a previous decl of the same name. */
3521 tem = pushdecl (decl);
3523 /* For a local variable, define the RTL now. */
3524 if (current_binding_level != global_binding_level
3525 /* But not if this is a duplicate decl
3526 and we preserved the rtl from the previous one
3527 (which may or may not happen). */
3528 && !DECL_RTL_SET_P (tem)
3529 && !DECL_CONTEXT (tem))
3531 if (TREE_TYPE (tem) != error_mark_node
3532 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3534 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3535 && DECL_INITIAL (tem) != 0)
3542 /* Finish processing of a declaration;
3543 install its initial value.
3544 If the length of an array type is not known before,
3545 it must be determined now, from the initial value, or it is an error. */
3548 finish_decl (decl, init, asmspec_tree)
3552 tree type = TREE_TYPE (decl);
3553 int was_incomplete = (DECL_SIZE (decl) == 0);
3554 const char *asmspec = 0;
3556 /* If a name was specified, get the string. */
3558 asmspec = TREE_STRING_POINTER (asmspec_tree);
3560 /* If `start_decl' didn't like having an initialization, ignore it now. */
3561 if (init != 0 && DECL_INITIAL (decl) == 0)
3564 /* Don't crash if parm is initialized. */
3565 if (TREE_CODE (decl) == PARM_DECL)
3570 if (TREE_CODE (decl) != TYPE_DECL)
3571 store_init_value (decl, init);
3574 /* typedef foo = bar; store the type of bar as the type of foo. */
3575 TREE_TYPE (decl) = TREE_TYPE (init);
3576 DECL_INITIAL (decl) = init = 0;
3580 /* Deduce size of array from initialization, if not already known */
3581 if (TREE_CODE (type) == ARRAY_TYPE
3582 && TYPE_DOMAIN (type) == 0
3583 && TREE_CODE (decl) != TYPE_DECL)
3586 = (TREE_STATIC (decl)
3587 /* Even if pedantic, an external linkage array
3588 may have incomplete type at first. */
3589 ? pedantic && !TREE_PUBLIC (decl)
3590 : !DECL_EXTERNAL (decl));
3592 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3594 /* Get the completed type made by complete_array_type. */
3595 type = TREE_TYPE (decl);
3598 error_with_decl (decl, "initializer fails to determine size of `%s'");
3600 else if (failure == 2)
3603 error_with_decl (decl, "array size missing in `%s'");
3604 /* If a `static' var's size isn't known,
3605 make it extern as well as static, so it does not get
3607 If it is not `static', then do not mark extern;
3608 finish_incomplete_decl will give it a default size
3609 and it will get allocated. */
3610 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3611 DECL_EXTERNAL (decl) = 1;
3614 /* TYPE_MAX_VALUE is always one less than the number of elements
3615 in the array, because we start counting at zero. Therefore,
3616 warn only if the value is less than zero. */
3617 else if (pedantic && TYPE_DOMAIN (type) != 0
3618 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3619 error_with_decl (decl, "zero or negative size array `%s'");
3621 layout_decl (decl, 0);
3624 if (TREE_CODE (decl) == VAR_DECL)
3626 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3627 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3628 layout_decl (decl, 0);
3630 if (DECL_SIZE (decl) == 0
3631 /* Don't give an error if we already gave one earlier. */
3632 && TREE_TYPE (decl) != error_mark_node
3633 && (TREE_STATIC (decl)
3635 /* A static variable with an incomplete type
3636 is an error if it is initialized.
3637 Also if it is not file scope.
3638 Otherwise, let it through, but if it is not `extern'
3639 then it may cause an error message later. */
3640 (DECL_INITIAL (decl) != 0
3641 || DECL_CONTEXT (decl) != 0)
3643 /* An automatic variable with an incomplete type
3645 !DECL_EXTERNAL (decl)))
3647 error_with_decl (decl, "storage size of `%s' isn't known");
3648 TREE_TYPE (decl) = error_mark_node;
3651 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3652 && DECL_SIZE (decl) != 0)
3654 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3655 constant_expression_warning (DECL_SIZE (decl));
3657 error_with_decl (decl, "storage size of `%s' isn't constant");
3660 if (TREE_USED (type))
3661 TREE_USED (decl) = 1;
3664 /* If this is a function and an assembler name is specified, it isn't
3665 builtin any more. Also reset DECL_RTL so we can give it its new
3667 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3669 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3670 SET_DECL_RTL (decl, NULL_RTX);
3671 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3674 /* Output the assembler code and/or RTL code for variables and functions,
3675 unless the type is an undefined structure or union.
3676 If not, it will get done when the type is completed. */
3678 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3680 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3681 maybe_objc_check_decl (decl);
3683 if (!DECL_CONTEXT (decl))
3685 if (DECL_INITIAL (decl) == NULL_TREE
3686 || DECL_INITIAL (decl) == error_mark_node)
3687 /* Don't output anything
3688 when a tentative file-scope definition is seen.
3689 But at end of compilation, do output code for them. */
3690 DECL_DEFER_OUTPUT (decl) = 1;
3691 rest_of_decl_compilation (decl, asmspec,
3692 (DECL_CONTEXT (decl) == 0
3693 || TREE_ASM_WRITTEN (decl)), 0);
3697 /* This is a local variable. If there is an ASMSPEC, the
3698 user has requested that we handle it specially. */
3701 /* In conjunction with an ASMSPEC, the `register'
3702 keyword indicates that we should place the variable
3703 in a particular register. */
3704 if (DECL_REGISTER (decl))
3705 DECL_C_HARD_REGISTER (decl) = 1;
3707 /* If this is not a static variable, issue a warning.
3708 It doesn't make any sense to give an ASMSPEC for an
3709 ordinary, non-register local variable. Historically,
3710 GCC has accepted -- but ignored -- the ASMSPEC in
3712 if (TREE_CODE (decl) == VAR_DECL
3713 && !DECL_REGISTER (decl)
3714 && !TREE_STATIC (decl))
3715 warning_with_decl (decl,
3716 "ignoring asm-specifier for non-static local variable `%s'");
3718 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3721 if (TREE_CODE (decl) != FUNCTION_DECL)
3722 add_decl_stmt (decl);
3725 if (DECL_CONTEXT (decl) != 0)
3727 /* Recompute the RTL of a local array now
3728 if it used to be an incomplete type. */
3730 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3732 /* If we used it already as memory, it must stay in memory. */
3733 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3734 /* If it's still incomplete now, no init will save it. */
3735 if (DECL_SIZE (decl) == 0)
3736 DECL_INITIAL (decl) = 0;
3741 if (TREE_CODE (decl) == TYPE_DECL)
3743 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3744 maybe_objc_check_decl (decl);
3745 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3748 /* At the end of a declaration, throw away any variable type sizes
3749 of types defined inside that declaration. There is no use
3750 computing them in the following function definition. */
3751 if (current_binding_level == global_binding_level)
3752 get_pending_sizes ();
3755 /* If DECL has a cleanup, build and return that cleanup here.
3756 This is a callback called by expand_expr. */
3759 maybe_build_cleanup (decl)
3760 tree decl ATTRIBUTE_UNUSED;
3762 /* There are no cleanups in C. */
3766 /* Given a parsed parameter declaration,
3767 decode it into a PARM_DECL and push that on the current binding level.
3768 Also, for the sake of forward parm decls,
3769 record the given order of parms in `parm_order'. */
3772 push_parm_decl (parm)
3776 int old_immediate_size_expand = immediate_size_expand;
3777 /* Don't try computing parm sizes now -- wait till fn is called. */
3778 immediate_size_expand = 0;
3780 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3781 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3782 decl_attributes (&decl, TREE_VALUE (parm), 0);
3785 if (DECL_NAME (decl))
3788 olddecl = lookup_name (DECL_NAME (decl));
3789 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3790 pedwarn_with_decl (decl,
3791 "ISO C forbids parameter `%s' shadowing typedef");
3795 decl = pushdecl (decl);
3797 immediate_size_expand = old_immediate_size_expand;
3799 current_binding_level->parm_order
3800 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3802 /* Add this decl to the current binding level. */
3803 finish_decl (decl, NULL_TREE, NULL_TREE);
3806 /* Clear the given order of parms in `parm_order'.
3807 Used at start of parm list,
3808 and also at semicolon terminating forward decls. */
3813 current_binding_level->parm_order = NULL_TREE;
3816 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3817 literal, which may be an incomplete array type completed by the
3818 initializer; INIT is a CONSTRUCTOR that initializes the compound
3822 build_compound_literal (type, init)
3826 /* We do not use start_decl here because we have a type, not a declarator;
3827 and do not use finish_decl because the decl should be stored inside
3828 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3829 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3831 DECL_EXTERNAL (decl) = 0;
3832 TREE_PUBLIC (decl) = 0;
3833 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3834 DECL_CONTEXT (decl) = current_function_decl;
3835 TREE_USED (decl) = 1;
3836 TREE_TYPE (decl) = type;
3837 store_init_value (decl, init);
3839 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3841 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3846 type = TREE_TYPE (decl);
3847 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3848 return error_mark_node;
3850 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), decl);
3851 TREE_SIDE_EFFECTS (complit) = 1;
3853 layout_decl (decl, 0);
3855 if (TREE_STATIC (decl))
3857 /* This decl needs a name for the assembler output. We also need
3858 a unique suffix to be added to the name, for which DECL_CONTEXT
3860 DECL_NAME (decl) = get_identifier ("__compound_literal");
3861 DECL_CONTEXT (decl) = complit;
3862 rest_of_decl_compilation (decl, NULL, 1, 0);
3863 DECL_CONTEXT (decl) = NULL_TREE;
3869 /* Make TYPE a complete type based on INITIAL_VALUE.
3870 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3871 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3874 complete_array_type (type, initial_value, do_default)
3879 tree maxindex = NULL_TREE;
3884 /* Note MAXINDEX is really the maximum index,
3885 one less than the size. */
3886 if (TREE_CODE (initial_value) == STRING_CST)
3889 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3890 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3893 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3895 tree elts = CONSTRUCTOR_ELTS (initial_value);
3896 maxindex = build_int_2 (-1, -1);
3897 for (; elts; elts = TREE_CHAIN (elts))
3899 if (TREE_PURPOSE (elts))
3900 maxindex = TREE_PURPOSE (elts);
3902 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3903 maxindex, integer_one_node));
3905 maxindex = copy_node (maxindex);
3909 /* Make an error message unless that happened already. */
3910 if (initial_value != error_mark_node)
3913 /* Prevent further error messages. */
3914 maxindex = build_int_2 (0, 0);
3921 maxindex = build_int_2 (0, 0);
3927 TYPE_DOMAIN (type) = build_index_type (maxindex);
3928 if (!TREE_TYPE (maxindex))
3929 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3932 /* Lay out the type now that we can get the real answer. */
3939 /* Given declspecs and a declarator,
3940 determine the name and type of the object declared
3941 and construct a ..._DECL node for it.
3942 (In one case we can return a ..._TYPE node instead.
3943 For invalid input we sometimes return 0.)
3945 DECLSPECS is a chain of tree_list nodes whose value fields
3946 are the storage classes and type specifiers.
3948 DECL_CONTEXT says which syntactic context this declaration is in:
3949 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3950 FUNCDEF for a function definition. Like NORMAL but a few different
3951 error messages in each case. Return value may be zero meaning
3952 this definition is too screwy to try to parse.
3953 PARM for a parameter declaration (either within a function prototype
3954 or before a function body). Make a PARM_DECL, or return void_type_node.
3955 TYPENAME if for a typename (in a cast or sizeof).
3956 Don't make a DECL node; just return the ..._TYPE node.
3957 FIELD for a struct or union field; make a FIELD_DECL.
3958 BITFIELD for a field with specified width.
3959 INITIALIZED is 1 if the decl has an initializer.
3961 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3962 It may also be so in the PARM case, for a prototype where the
3963 argument type is specified but not the name.
3965 This function is where the complicated C meanings of `static'
3966 and `extern' are interpreted. */
3969 grokdeclarator (declarator, declspecs, decl_context, initialized)
3972 enum decl_context decl_context;
3977 tree type = NULL_TREE;
3982 int type_quals = TYPE_UNQUALIFIED;
3984 int explicit_int = 0;
3985 int explicit_char = 0;
3986 int defaulted_int = 0;
3987 tree typedef_decl = 0;
3989 tree typedef_type = 0;
3990 int funcdef_flag = 0;
3991 enum tree_code innermost_code = ERROR_MARK;
3993 int size_varies = 0;
3994 tree decl_attr = NULL_TREE;
3995 tree array_ptr_quals = NULL_TREE;
3996 int array_parm_static = 0;
3997 tree returned_attrs = NULL_TREE;
3999 if (decl_context == BITFIELD)
4000 bitfield = 1, decl_context = FIELD;
4002 if (decl_context == FUNCDEF)
4003 funcdef_flag = 1, decl_context = NORMAL;
4005 /* Look inside a declarator for the name being declared
4006 and get it as a string, for an error message. */
4008 tree decl = declarator;
4012 switch (TREE_CODE (decl))
4017 innermost_code = TREE_CODE (decl);
4018 decl = TREE_OPERAND (decl, 0);
4022 decl = TREE_VALUE (decl);
4025 case IDENTIFIER_NODE:
4026 name = IDENTIFIER_POINTER (decl);
4037 /* A function definition's declarator must have the form of
4038 a function declarator. */
4040 if (funcdef_flag && innermost_code != CALL_EXPR)
4043 /* Anything declared one level down from the top level
4044 must be one of the parameters of a function
4045 (because the body is at least two levels down). */
4047 /* If this looks like a function definition, make it one,
4048 even if it occurs where parms are expected.
4049 Then store_parm_decls will reject it and not use it as a parm. */
4050 if (decl_context == NORMAL && !funcdef_flag
4051 && current_binding_level->parm_flag)
4052 decl_context = PARM;
4054 /* Look through the decl specs and record which ones appear.
4055 Some typespecs are defined as built-in typenames.
4056 Others, the ones that are modifiers of other types,
4057 are represented by bits in SPECBITS: set the bits for
4058 the modifiers that appear. Storage class keywords are also in SPECBITS.
4060 If there is a typedef name or a type, store the type in TYPE.
4061 This includes builtin typedefs such as `int'.
4063 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4064 and did not come from a user typedef.
4066 Set LONGLONG if `long' is mentioned twice. */
4068 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4070 tree id = TREE_VALUE (spec);
4072 if (id == ridpointers[(int) RID_INT])
4074 if (id == ridpointers[(int) RID_CHAR])
4077 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4079 enum rid i = C_RID_CODE (id);
4080 if ((int) i <= (int) RID_LAST_MODIFIER)
4082 if (i == RID_LONG && (specbits & (1 << (int) i)))
4085 error ("`long long long' is too long for GCC");
4088 if (pedantic && !flag_isoc99 && ! in_system_header
4090 pedwarn ("ISO C89 does not support `long long'");
4094 else if (specbits & (1 << (int) i))
4095 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4096 specbits |= 1 << (int) i;
4101 error ("two or more data types in declaration of `%s'", name);
4102 /* Actual typedefs come to us as TYPE_DECL nodes. */
4103 else if (TREE_CODE (id) == TYPE_DECL)
4105 type = TREE_TYPE (id);
4106 decl_attr = DECL_ATTRIBUTES (id);
4109 /* Built-in types come as identifiers. */
4110 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4112 tree t = lookup_name (id);
4113 if (TREE_TYPE (t) == error_mark_node)
4115 else if (!t || TREE_CODE (t) != TYPE_DECL)
4116 error ("`%s' fails to be a typedef or built in type",
4117 IDENTIFIER_POINTER (id));
4120 type = TREE_TYPE (t);
4124 else if (TREE_CODE (id) != ERROR_MARK)
4131 typedef_type = type;
4133 size_varies = C_TYPE_VARIABLE_SIZE (type);
4135 /* No type at all: default to `int', and set DEFAULTED_INT
4136 because it was not a user-defined typedef. */
4140 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4141 | (1 << (int) RID_SIGNED)
4142 | (1 << (int) RID_UNSIGNED)
4143 | (1 << (int) RID_COMPLEX))))
4144 /* Don't warn about typedef foo = bar. */
4145 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4146 && ! in_system_header)
4148 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4149 and this is a function, or if -Wimplicit; prefer the former
4150 warning since it is more explicit. */
4151 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4153 warn_about_return_type = 1;
4154 else if (warn_implicit_int || flag_isoc99)
4155 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4160 type = integer_type_node;
4163 /* Now process the modifiers that were specified
4164 and check for invalid combinations. */
4166 /* Long double is a special combination. */
4168 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4169 && TYPE_MAIN_VARIANT (type) == double_type_node)
4171 specbits &= ~(1 << (int) RID_LONG);
4172 type = long_double_type_node;
4175 /* Check all other uses of type modifiers. */
4177 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4178 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4182 if ((specbits & 1 << (int) RID_LONG)
4183 && (specbits & 1 << (int) RID_SHORT))
4184 error ("both long and short specified for `%s'", name);
4185 else if (((specbits & 1 << (int) RID_LONG)
4186 || (specbits & 1 << (int) RID_SHORT))
4188 error ("long or short specified with char for `%s'", name);
4189 else if (((specbits & 1 << (int) RID_LONG)
4190 || (specbits & 1 << (int) RID_SHORT))
4191 && TREE_CODE (type) == REAL_TYPE)
4193 static int already = 0;
4195 error ("long or short specified with floating type for `%s'", name);
4196 if (! already && ! pedantic)
4198 error ("the only valid combination is `long double'");
4202 else if ((specbits & 1 << (int) RID_SIGNED)
4203 && (specbits & 1 << (int) RID_UNSIGNED))
4204 error ("both signed and unsigned specified for `%s'", name);
4205 else if (TREE_CODE (type) != INTEGER_TYPE)
4206 error ("long, short, signed or unsigned invalid for `%s'", name);
4210 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4212 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4214 if (flag_pedantic_errors)
4219 /* Discard the type modifiers if they are invalid. */
4222 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4223 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4228 if ((specbits & (1 << (int) RID_COMPLEX))
4229 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4231 error ("complex invalid for `%s'", name);
4232 specbits &= ~(1 << (int) RID_COMPLEX);
4235 /* Decide whether an integer type is signed or not.
4236 Optionally treat bitfields as signed by default. */
4237 if (specbits & 1 << (int) RID_UNSIGNED
4238 /* Traditionally, all bitfields are unsigned. */
4239 || (bitfield && flag_traditional
4240 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4241 || (bitfield && ! flag_signed_bitfields
4242 && (explicit_int || defaulted_int || explicit_char
4243 /* A typedef for plain `int' without `signed'
4244 can be controlled just like plain `int'. */
4245 || ! (typedef_decl != 0
4246 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4247 && TREE_CODE (type) != ENUMERAL_TYPE
4248 && !(specbits & 1 << (int) RID_SIGNED)))
4251 type = long_long_unsigned_type_node;
4252 else if (specbits & 1 << (int) RID_LONG)
4253 type = long_unsigned_type_node;
4254 else if (specbits & 1 << (int) RID_SHORT)
4255 type = short_unsigned_type_node;
4256 else if (type == char_type_node)
4257 type = unsigned_char_type_node;
4258 else if (typedef_decl)
4259 type = unsigned_type (type);
4261 type = unsigned_type_node;
4263 else if ((specbits & 1 << (int) RID_SIGNED)
4264 && type == char_type_node)
4265 type = signed_char_type_node;
4267 type = long_long_integer_type_node;
4268 else if (specbits & 1 << (int) RID_LONG)
4269 type = long_integer_type_node;
4270 else if (specbits & 1 << (int) RID_SHORT)
4271 type = short_integer_type_node;
4273 if (specbits & 1 << (int) RID_COMPLEX)
4275 if (pedantic && !flag_isoc99)
4276 pedwarn ("ISO C89 does not support complex types");
4277 /* If we just have "complex", it is equivalent to
4278 "complex double", but if any modifiers at all are specified it is
4279 the complex form of TYPE. E.g, "complex short" is
4280 "complex short int". */
4282 if (defaulted_int && ! longlong
4283 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4284 | (1 << (int) RID_SIGNED)
4285 | (1 << (int) RID_UNSIGNED))))
4288 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4289 type = complex_double_type_node;
4291 else if (type == integer_type_node)
4294 pedwarn ("ISO C does not support complex integer types");
4295 type = complex_integer_type_node;
4297 else if (type == float_type_node)
4298 type = complex_float_type_node;
4299 else if (type == double_type_node)
4300 type = complex_double_type_node;
4301 else if (type == long_double_type_node)
4302 type = complex_long_double_type_node;
4306 pedwarn ("ISO C does not support complex integer types");
4307 type = build_complex_type (type);
4311 /* Figure out the type qualifiers for the declaration. There are
4312 two ways a declaration can become qualified. One is something
4313 like `const int i' where the `const' is explicit. Another is
4314 something like `typedef const int CI; CI i' where the type of the
4315 declaration contains the `const'. */
4316 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4317 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4318 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4319 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4320 if (constp > 1 && ! flag_isoc99)
4321 pedwarn ("duplicate `const'");
4322 if (restrictp > 1 && ! flag_isoc99)
4323 pedwarn ("duplicate `restrict'");
4324 if (volatilep > 1 && ! flag_isoc99)
4325 pedwarn ("duplicate `volatile'");
4326 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4327 type = TYPE_MAIN_VARIANT (type);
4328 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4329 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4330 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4332 /* Warn if two storage classes are given. Default to `auto'. */
4337 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4338 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4339 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4340 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4341 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4343 /* Warn about storage classes that are invalid for certain
4344 kinds of declarations (parameters, typenames, etc.). */
4347 error ("multiple storage classes in declaration of `%s'", name);
4348 else if (funcdef_flag
4350 & ((1 << (int) RID_REGISTER)
4351 | (1 << (int) RID_AUTO)
4352 | (1 << (int) RID_TYPEDEF))))
4354 if (specbits & 1 << (int) RID_AUTO
4355 && (pedantic || current_binding_level == global_binding_level))
4356 pedwarn ("function definition declared `auto'");
4357 if (specbits & 1 << (int) RID_REGISTER)
4358 error ("function definition declared `register'");
4359 if (specbits & 1 << (int) RID_TYPEDEF)
4360 error ("function definition declared `typedef'");
4361 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4362 | (1 << (int) RID_AUTO));
4364 else if (decl_context != NORMAL && nclasses > 0)
4366 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4370 switch (decl_context)
4373 error ("storage class specified for structure field `%s'",
4377 error ("storage class specified for parameter `%s'", name);
4380 error ("storage class specified for typename");
4383 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4384 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4385 | (1 << (int) RID_EXTERN));
4388 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4390 /* `extern' with initialization is invalid if not at top level. */
4391 if (current_binding_level == global_binding_level)
4392 warning ("`%s' initialized and declared `extern'", name);
4394 error ("`%s' has both `extern' and initializer", name);
4396 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4397 && current_binding_level != global_binding_level)
4398 error ("nested function `%s' declared `extern'", name);
4399 else if (current_binding_level == global_binding_level
4400 && specbits & (1 << (int) RID_AUTO))
4401 error ("top-level declaration of `%s' specifies `auto'", name);
4404 /* Now figure out the structure of the declarator proper.
4405 Descend through it, creating more complex types, until we reach
4406 the declared identifier (or NULL_TREE, in an absolute declarator). */
4408 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4410 if (type == error_mark_node)
4412 declarator = TREE_OPERAND (declarator, 0);
4416 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4417 an INDIRECT_REF (for *...),
4418 a CALL_EXPR (for ...(...)),
4419 a TREE_LIST (for nested attributes),
4420 an identifier (for the name being declared)
4421 or a null pointer (for the place in an absolute declarator
4422 where the name was omitted).
4423 For the last two cases, we have just exited the loop.
4425 At this point, TYPE is the type of elements of an array,
4426 or for a function to return, or for a pointer to point to.
4427 After this sequence of ifs, TYPE is the type of the
4428 array or function or pointer, and DECLARATOR has had its
4429 outermost layer removed. */
4431 if (array_ptr_quals != NULL_TREE || array_parm_static)
4433 /* Only the innermost declarator (making a parameter be of
4434 array type which is converted to pointer type)
4435 may have static or type qualifiers. */
4436 error ("static or type qualifiers in non-parameter array declarator");
4437 array_ptr_quals = NULL_TREE;
4438 array_parm_static = 0;
4441 if (TREE_CODE (declarator) == TREE_LIST)
4443 /* We encode a declarator with embedded attributes using
4445 tree attrs = TREE_PURPOSE (declarator);
4448 declarator = TREE_VALUE (declarator);
4449 inner_decl = declarator;
4450 while (inner_decl != NULL_TREE
4451 && TREE_CODE (inner_decl) == TREE_LIST)
4452 inner_decl = TREE_VALUE (inner_decl);
4453 if (inner_decl == NULL_TREE
4454 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4455 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4456 if (TREE_CODE (inner_decl) == CALL_EXPR)
4457 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4458 if (TREE_CODE (inner_decl) == ARRAY_REF)
4459 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4460 returned_attrs = decl_attributes (&type,
4461 chainon (returned_attrs, attrs),
4464 else if (TREE_CODE (declarator) == ARRAY_REF)
4466 tree itype = NULL_TREE;
4467 tree size = TREE_OPERAND (declarator, 1);
4468 /* The index is a signed object `sizetype' bits wide. */
4469 tree index_type = signed_type (sizetype);
4471 array_ptr_quals = TREE_TYPE (declarator);
4472 array_parm_static = TREE_STATIC (declarator);
4474 declarator = TREE_OPERAND (declarator, 0);
4476 /* Check for some types that there cannot be arrays of. */
4478 if (VOID_TYPE_P (type))
4480 error ("declaration of `%s' as array of voids", name);
4481 type = error_mark_node;
4484 if (TREE_CODE (type) == FUNCTION_TYPE)
4486 error ("declaration of `%s' as array of functions", name);
4487 type = error_mark_node;
4490 if (size == error_mark_node)
4491 type = error_mark_node;
4493 if (type == error_mark_node)
4496 /* If size was specified, set ITYPE to a range-type for that size.
4497 Otherwise, ITYPE remains null. finish_decl may figure it out
4498 from an initial value. */
4502 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4503 STRIP_TYPE_NOPS (size);
4505 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4507 error ("size of array `%s' has non-integer type", name);
4508 size = integer_one_node;
4511 if (pedantic && integer_zerop (size))
4512 pedwarn ("ISO C forbids zero-size array `%s'", name);
4514 if (TREE_CODE (size) == INTEGER_CST)
4516 constant_expression_warning (size);
4517 if (tree_int_cst_sgn (size) < 0)
4519 error ("size of array `%s' is negative", name);
4520 size = integer_one_node;
4525 /* Make sure the array size remains visibly nonconstant
4526 even if it is (eg) a const variable with known value. */
4531 if (TREE_CONSTANT (size))
4532 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4535 pedwarn ("ISO C89 forbids variable-size array `%s'",
4540 if (integer_zerop (size))
4542 /* A zero-length array cannot be represented with an
4543 unsigned index type, which is what we'll get with
4544 build_index_type. Create an open-ended range instead. */
4545 itype = build_range_type (sizetype, size, NULL_TREE);
4549 /* Compute the maximum valid index, that is, size - 1.
4550 Do the calculation in index_type, so that if it is
4551 a variable the computations will be done in the
4553 itype = fold (build (MINUS_EXPR, index_type,
4554 convert (index_type, size),
4555 convert (index_type, size_one_node)));
4557 /* If that overflowed, the array is too big.
4558 ??? While a size of INT_MAX+1 technically shouldn't
4559 cause an overflow (because we subtract 1), the overflow
4560 is recorded during the conversion to index_type, before
4561 the subtraction. Handling this case seems like an
4562 unnecessary complication. */
4563 if (TREE_OVERFLOW (itype))
4565 error ("size of array `%s' is too large", name);
4566 type = error_mark_node;
4571 itype = variable_size (itype);
4572 itype = build_index_type (itype);
4575 else if (decl_context == FIELD)
4577 /* ??? Need to check somewhere that this is a structure
4578 and not a union, that this field is last, and that
4579 this structure has at least one other named member. */
4581 if (pedantic && !flag_isoc99 && !in_system_header)
4582 pedwarn ("ISO C89 does not support flexible array members");
4584 /* ISO C99 Flexible array members are effectively identical
4585 to GCC's zero-length array extension. */
4586 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4589 /* If pedantic, complain about arrays of incomplete types. */
4591 if (pedantic && !COMPLETE_TYPE_P (type))
4592 pedwarn ("array type has incomplete element type");
4595 /* We shouldn't have a function type here at all!
4596 Functions aren't allowed as array elements. */
4597 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4598 && (constp || volatilep))
4599 pedwarn ("ISO C forbids const or volatile function types");
4602 /* Build the array type itself, then merge any constancy or
4603 volatility into the target type. We must do it in this order
4604 to ensure that the TYPE_MAIN_VARIANT field of the array type
4605 is set correctly. */
4607 type = build_array_type (type, itype);
4609 type = c_build_qualified_type (type, type_quals);
4612 C_TYPE_VARIABLE_SIZE (type) = 1;
4614 /* The GCC extension for zero-length arrays differs from
4615 ISO flexible array members in that sizeof yields zero. */
4616 if (size && integer_zerop (size))
4619 TYPE_SIZE (type) = bitsize_zero_node;
4620 TYPE_SIZE_UNIT (type) = size_zero_node;
4622 if (decl_context != PARM
4623 && (array_ptr_quals != NULL_TREE || array_parm_static))
4625 error ("static or type qualifiers in non-parameter array declarator");
4626 array_ptr_quals = NULL_TREE;
4627 array_parm_static = 0;
4630 else if (TREE_CODE (declarator) == CALL_EXPR)
4634 /* Declaring a function type.
4635 Make sure we have a valid type for the function to return. */
4636 if (type == error_mark_node)
4641 /* Warn about some types functions can't return. */
4643 if (TREE_CODE (type) == FUNCTION_TYPE)
4645 error ("`%s' declared as function returning a function", name);
4646 type = integer_type_node;
4648 if (TREE_CODE (type) == ARRAY_TYPE)
4650 error ("`%s' declared as function returning an array", name);
4651 type = integer_type_node;
4654 #ifndef TRADITIONAL_RETURN_FLOAT
4655 /* Traditionally, declaring return type float means double. */
4657 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4658 type = double_type_node;
4659 #endif /* TRADITIONAL_RETURN_FLOAT */
4661 /* Construct the function type and go to the next
4662 inner layer of declarator. */
4664 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4666 /* Say it's a definition
4667 only for the CALL_EXPR
4668 closest to the identifier. */
4669 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4670 /* Type qualifiers before the return type of the function
4671 qualify the return type, not the function type. */
4674 /* Type qualifiers on a function return type are normally
4675 permitted by the standard but have no effect, so give a
4676 warning at -W. Qualifiers on a void return type have
4677 meaning as a GNU extension, and are banned on function
4678 definitions in ISO C. FIXME: strictly we shouldn't
4679 pedwarn for qualified void return types except on function
4680 definitions, but not doing so could lead to the undesirable
4681 state of a "volatile void" function return type not being
4682 warned about, and a use of the function being compiled
4683 with GNU semantics, with no diagnostics under -pedantic. */
4684 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4685 pedwarn ("ISO C forbids qualified void function return type");
4686 else if (extra_warnings
4687 && !(VOID_TYPE_P (type)
4688 && type_quals == TYPE_QUAL_VOLATILE))
4689 warning ("type qualifiers ignored on function return type");
4691 type = c_build_qualified_type (type, type_quals);
4693 type_quals = TYPE_UNQUALIFIED;
4695 type = build_function_type (type, arg_types);
4696 declarator = TREE_OPERAND (declarator, 0);
4698 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4699 the formal parameter list of this FUNCTION_TYPE to point to
4700 the FUNCTION_TYPE node itself. */
4705 for (link = last_function_parm_tags;
4707 link = TREE_CHAIN (link))
4708 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4711 else if (TREE_CODE (declarator) == INDIRECT_REF)
4713 /* Merge any constancy or volatility into the target type
4716 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4718 pedwarn ("ISO C forbids qualified function types");
4720 type = c_build_qualified_type (type, type_quals);
4721 type_quals = TYPE_UNQUALIFIED;
4724 type = build_pointer_type (type);
4726 /* Process a list of type modifier keywords
4727 (such as const or volatile) that were given inside the `*'. */
4729 if (TREE_TYPE (declarator))
4737 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4738 typemodlist = TREE_CHAIN (typemodlist))
4740 tree qualifier = TREE_VALUE (typemodlist);
4742 if (C_IS_RESERVED_WORD (qualifier))
4744 if (C_RID_CODE (qualifier) == RID_CONST)
4746 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4748 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4758 error ("invalid type modifier within pointer declarator");
4759 if (constp > 1 && ! flag_isoc99)
4760 pedwarn ("duplicate `const'");
4761 if (volatilep > 1 && ! flag_isoc99)
4762 pedwarn ("duplicate `volatile'");
4763 if (restrictp > 1 && ! flag_isoc99)
4764 pedwarn ("duplicate `restrict'");
4766 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4767 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4768 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4771 declarator = TREE_OPERAND (declarator, 0);
4778 /* Now TYPE has the actual type. */
4780 /* Did array size calculations overflow? */
4782 if (TREE_CODE (type) == ARRAY_TYPE
4783 && COMPLETE_TYPE_P (type)
4784 && TREE_OVERFLOW (TYPE_SIZE (type)))
4786 error ("size of array `%s' is too large", name);
4787 /* If we proceed with the array type as it is, we'll eventually
4788 crash in tree_low_cst(). */
4789 type = error_mark_node;
4792 /* If this is declaring a typedef name, return a TYPE_DECL. */
4794 if (specbits & (1 << (int) RID_TYPEDEF))
4797 /* Note that the grammar rejects storage classes
4798 in typenames, fields or parameters */
4799 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4801 pedwarn ("ISO C forbids qualified function types");
4803 type = c_build_qualified_type (type, type_quals);
4804 decl = build_decl (TYPE_DECL, declarator, type);
4805 if ((specbits & (1 << (int) RID_SIGNED))
4806 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4807 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4808 decl_attributes (&decl, returned_attrs, 0);
4812 /* Detect the case of an array type of unspecified size
4813 which came, as such, direct from a typedef name.
4814 We must copy the type, so that each identifier gets
4815 a distinct type, so that each identifier's size can be
4816 controlled separately by its own initializer. */
4818 if (type != 0 && typedef_type != 0
4819 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4820 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4822 type = build_array_type (TREE_TYPE (type), 0);
4824 C_TYPE_VARIABLE_SIZE (type) = 1;
4827 /* If this is a type name (such as, in a cast or sizeof),
4828 compute the type and return it now. */
4830 if (decl_context == TYPENAME)
4832 /* Note that the grammar rejects storage classes
4833 in typenames, fields or parameters */
4834 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4836 pedwarn ("ISO C forbids const or volatile function types");
4838 type = c_build_qualified_type (type, type_quals);
4839 decl_attributes (&type, returned_attrs, 0);
4843 /* Aside from typedefs and type names (handle above),
4844 `void' at top level (not within pointer)
4845 is allowed only in public variables.
4846 We don't complain about parms either, but that is because
4847 a better error message can be made later. */
4849 if (VOID_TYPE_P (type) && decl_context != PARM
4850 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4851 && ((specbits & (1 << (int) RID_EXTERN))
4852 || (current_binding_level == global_binding_level
4854 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4856 error ("variable or field `%s' declared void", name);
4857 type = integer_type_node;
4860 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4861 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4866 if (decl_context == PARM)
4868 tree type_as_written;
4871 /* A parameter declared as an array of T is really a pointer to T.
4872 One declared as a function is really a pointer to a function. */
4874 if (TREE_CODE (type) == ARRAY_TYPE)
4876 /* Transfer const-ness of array into that of type pointed to. */
4877 type = TREE_TYPE (type);
4879 type = c_build_qualified_type (type, type_quals);
4880 type = build_pointer_type (type);
4881 type_quals = TYPE_UNQUALIFIED;
4882 if (array_ptr_quals)
4884 tree new_ptr_quals, new_ptr_attrs;
4886 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4887 /* We don't yet implement attributes in this context. */
4888 if (new_ptr_attrs != NULL_TREE)
4889 warning ("attributes in parameter array declarator ignored");
4894 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4896 tree qualifier = TREE_VALUE (new_ptr_quals);
4898 if (C_IS_RESERVED_WORD (qualifier))
4900 if (C_RID_CODE (qualifier) == RID_CONST)
4902 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4904 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4914 error ("invalid type modifier within array declarator");
4916 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4917 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4918 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4922 else if (TREE_CODE (type) == FUNCTION_TYPE)
4924 if (pedantic && type_quals)
4925 pedwarn ("ISO C forbids qualified function types");
4927 type = c_build_qualified_type (type, type_quals);
4928 type = build_pointer_type (type);
4929 type_quals = TYPE_UNQUALIFIED;
4931 else if (type_quals)
4932 type = c_build_qualified_type (type, type_quals);
4934 type_as_written = type;
4936 decl = build_decl (PARM_DECL, declarator, type);
4938 C_DECL_VARIABLE_SIZE (decl) = 1;
4940 /* Compute the type actually passed in the parmlist,
4941 for the case where there is no prototype.
4942 (For example, shorts and chars are passed as ints.)
4943 When there is a prototype, this is overridden later. */
4945 if (type == error_mark_node)
4946 promoted_type = type;
4949 promoted_type = simple_type_promotes_to (type);
4950 if (! promoted_type)
4951 promoted_type = type;
4954 DECL_ARG_TYPE (decl) = promoted_type;
4955 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4957 else if (decl_context == FIELD)
4959 /* Structure field. It may not be a function. */
4961 if (TREE_CODE (type) == FUNCTION_TYPE)
4963 error ("field `%s' declared as a function", name);
4964 type = build_pointer_type (type);
4966 else if (TREE_CODE (type) != ERROR_MARK
4967 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4969 error ("field `%s' has incomplete type", name);
4970 type = error_mark_node;
4972 /* Move type qualifiers down to element of an array. */
4973 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4975 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4977 TYPE_DOMAIN (type));
4979 /* Leave the field const or volatile as well. */
4980 type_quals = TYPE_UNQUALIFIED;
4983 decl = build_decl (FIELD_DECL, declarator, type);
4984 DECL_NONADDRESSABLE_P (decl) = bitfield;
4987 C_DECL_VARIABLE_SIZE (decl) = 1;
4989 else if (TREE_CODE (type) == FUNCTION_TYPE)
4991 /* Every function declaration is "external"
4992 except for those which are inside a function body
4993 in which `auto' is used.
4994 That is a case not specified by ANSI C,
4995 and we use it for forward declarations for nested functions. */
4996 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4997 || current_binding_level == global_binding_level);
4999 if (specbits & (1 << (int) RID_AUTO)
5000 && (pedantic || current_binding_level == global_binding_level))
5001 pedwarn ("invalid storage class for function `%s'", name);
5002 if (specbits & (1 << (int) RID_REGISTER))
5003 error ("invalid storage class for function `%s'", name);
5004 /* Function declaration not at top level.
5005 Storage classes other than `extern' are not allowed
5006 and `extern' makes no difference. */
5007 if (current_binding_level != global_binding_level
5008 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5010 pedwarn ("invalid storage class for function `%s'", name);
5012 decl = build_decl (FUNCTION_DECL, declarator, type);
5013 decl = build_decl_attribute_variant (decl, decl_attr);
5015 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
5016 ggc_alloc_cleared (sizeof (struct lang_decl));
5018 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
5019 pedwarn ("ISO C forbids qualified function types");
5021 /* GNU C interprets a `volatile void' return type to indicate
5022 that the function does not return. */
5023 if ((type_quals & TYPE_QUAL_VOLATILE)
5024 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5025 warning ("`noreturn' function returns non-void value");
5028 DECL_EXTERNAL (decl) = 1;
5029 /* Record absence of global scope for `static' or `auto'. */
5031 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5033 /* Record presence of `inline', if it is reasonable. */
5034 if (MAIN_NAME_P (declarator))
5037 warning ("cannot inline function `main'");
5041 /* Assume that otherwise the function can be inlined. */
5042 DECL_INLINE (decl) = 1;
5043 DECL_DECLARED_INLINE_P (decl) = 1;
5045 if (specbits & (1 << (int) RID_EXTERN))
5046 current_extern_inline = 1;
5048 /* If -finline-functions, assume it can be inlined. This does
5049 two things: let the function be deferred until it is actually
5050 needed, and let dwarf2 know that the function is inlinable. */
5051 else if (flag_inline_trees == 2)
5053 DECL_INLINE (decl) = 1;
5054 DECL_DECLARED_INLINE_P (decl) = 0;
5059 /* It's a variable. */
5060 /* An uninitialized decl with `extern' is a reference. */
5061 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5063 /* Move type qualifiers down to element of an array. */
5064 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5066 int saved_align = TYPE_ALIGN(type);
5067 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5069 TYPE_DOMAIN (type));
5070 TYPE_ALIGN (type) = saved_align;
5071 #if 0 /* Leave the variable const or volatile as well. */
5072 type_quals = TYPE_UNQUALIFIED;
5075 else if (type_quals)
5076 type = c_build_qualified_type (type, type_quals);
5078 decl = build_decl (VAR_DECL, declarator, type);
5080 C_DECL_VARIABLE_SIZE (decl) = 1;
5083 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5085 DECL_EXTERNAL (decl) = extern_ref;
5086 /* At top level, the presence of a `static' or `register' storage
5087 class specifier, or the absence of all storage class specifiers
5088 makes this declaration a definition (perhaps tentative). Also,
5089 the absence of both `static' and `register' makes it public. */
5090 if (current_binding_level == global_binding_level)
5094 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5095 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5097 /* Not at top level, only `static' makes a static definition. */
5100 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5101 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5105 /* Record `register' declaration for warnings on &
5106 and in case doing stupid register allocation. */
5108 if (specbits & (1 << (int) RID_REGISTER))
5109 DECL_REGISTER (decl) = 1;
5111 /* Record constancy and volatility. */
5112 c_apply_type_quals_to_decl (type_quals, decl);
5114 /* If a type has volatile components, it should be stored in memory.
5115 Otherwise, the fact that those components are volatile
5116 will be ignored, and would even crash the compiler. */
5117 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5118 mark_addressable (decl);
5120 decl_attributes (&decl, returned_attrs, 0);
5126 /* Decode the parameter-list info for a function type or function definition.
5127 The argument is the value returned by `get_parm_info' (or made in parse.y
5128 if there is an identifier list instead of a parameter decl list).
5129 These two functions are separate because when a function returns
5130 or receives functions then each is called multiple times but the order
5131 of calls is different. The last call to `grokparms' is always the one
5132 that contains the formal parameter names of a function definition.
5134 Store in `last_function_parms' a chain of the decls of parms.
5135 Also store in `last_function_parm_tags' a chain of the struct, union,
5136 and enum tags declared among the parms.
5138 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5140 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5141 a mere declaration. A nonempty identifier-list gets an error message
5142 when FUNCDEF_FLAG is zero. */
5145 grokparms (parms_info, funcdef_flag)
5149 tree first_parm = TREE_CHAIN (parms_info);
5151 last_function_parms = TREE_PURPOSE (parms_info);
5152 last_function_parm_tags = TREE_VALUE (parms_info);
5154 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5155 && !in_system_header)
5156 warning ("function declaration isn't a prototype");
5159 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5162 pedwarn ("parameter names (without types) in function declaration");
5164 last_function_parms = first_parm;
5171 /* We no longer test FUNCDEF_FLAG.
5172 If the arg types are incomplete in a declaration,
5173 they must include undefined tags.
5174 These tags can never be defined in the scope of the declaration,
5175 so the types can never be completed,
5176 and no call can be compiled successfully. */
5178 /* In a fcn definition, arg types must be complete. */
5181 for (parm = last_function_parms, typelt = first_parm;
5183 parm = TREE_CHAIN (parm))
5184 /* Skip over any enumeration constants declared here. */
5185 if (TREE_CODE (parm) == PARM_DECL)
5187 /* Barf if the parameter itself has an incomplete type. */
5188 tree type = TREE_VALUE (typelt);
5189 if (type == error_mark_node)
5191 if (!COMPLETE_TYPE_P (type))
5193 if (funcdef_flag && DECL_NAME (parm) != 0)
5194 error ("parameter `%s' has incomplete type",
5195 IDENTIFIER_POINTER (DECL_NAME (parm)));
5197 warning ("parameter has incomplete type");
5200 TREE_VALUE (typelt) = error_mark_node;
5201 TREE_TYPE (parm) = error_mark_node;
5205 /* This has been replaced by parm_tags_warning, which
5206 uses a more accurate criterion for what to warn
5210 /* Now warn if is a pointer to an incomplete type. */
5211 while (TREE_CODE (type) == POINTER_TYPE
5212 || TREE_CODE (type) == REFERENCE_TYPE)
5213 type = TREE_TYPE (type);
5214 type = TYPE_MAIN_VARIANT (type);
5215 if (!COMPLETE_TYPE_P (type))
5217 if (DECL_NAME (parm) != 0)
5218 warning ("parameter `%s' points to incomplete type",
5219 IDENTIFIER_POINTER (DECL_NAME (parm)));
5221 warning ("parameter points to incomplete type");
5225 typelt = TREE_CHAIN (typelt);
5232 /* Return a tree_list node with info on a parameter list just parsed.
5233 The TREE_PURPOSE is a chain of decls of those parms.
5234 The TREE_VALUE is a list of structure, union and enum tags defined.
5235 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5236 This tree_list node is later fed to `grokparms'.
5238 VOID_AT_END nonzero means append `void' to the end of the type-list.
5239 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5242 get_parm_info (void_at_end)
5248 tree tags = gettags ();
5249 tree parms = getdecls ();
5251 tree order = current_binding_level->parm_order;
5253 /* Just `void' (and no ellipsis) is special. There are really no parms.
5254 But if the `void' is qualified (by `const' or `volatile') or has a
5255 storage class specifier (`register'), then the behavior is undefined;
5256 by not counting it as the special case of `void' we will cause an
5257 error later. Typedefs for `void' are OK (see DR#157). */
5258 if (void_at_end && parms != 0
5259 && TREE_CHAIN (parms) == 0
5260 && VOID_TYPE_P (TREE_TYPE (parms))
5261 && ! TREE_THIS_VOLATILE (parms)
5262 && ! TREE_READONLY (parms)
5263 && ! DECL_REGISTER (parms)
5264 && DECL_NAME (parms) == 0)
5267 storedecls (NULL_TREE);
5268 return tree_cons (NULL_TREE, NULL_TREE,
5269 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5272 /* Extract enumerator values and other non-parms declared with the parms.
5273 Likewise any forward parm decls that didn't have real parm decls. */
5274 for (decl = parms; decl;)
5276 tree next = TREE_CHAIN (decl);
5278 if (TREE_CODE (decl) != PARM_DECL)
5280 TREE_CHAIN (decl) = new_parms;
5283 else if (TREE_ASM_WRITTEN (decl))
5285 error_with_decl (decl,
5286 "parameter `%s' has just a forward declaration");
5287 TREE_CHAIN (decl) = new_parms;
5293 /* Put the parm decls back in the order they were in in the parm list. */
5294 for (t = order; t; t = TREE_CHAIN (t))
5297 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5299 TREE_CHAIN (TREE_VALUE (t)) = 0;
5302 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5305 /* Store the parmlist in the binding level since the old one
5306 is no longer a valid list. (We have changed the chain pointers.) */
5307 storedecls (new_parms);
5309 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5310 /* There may also be declarations for enumerators if an enumeration
5311 type is declared among the parms. Ignore them here. */
5312 if (TREE_CODE (decl) == PARM_DECL)
5314 /* Since there is a prototype,
5315 args are passed in their declared types. */
5316 tree type = TREE_TYPE (decl);
5317 DECL_ARG_TYPE (decl) = type;
5318 if (PROMOTE_PROTOTYPES
5319 && INTEGRAL_TYPE_P (type)
5320 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5321 DECL_ARG_TYPE (decl) = integer_type_node;
5323 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5324 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5325 && DECL_NAME (decl) == 0)
5327 error ("`void' in parameter list must be the entire list");
5333 return tree_cons (new_parms, tags,
5334 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5336 return tree_cons (new_parms, tags, nreverse (types));
5339 /* At end of parameter list, warn about any struct, union or enum tags
5340 defined within. Do so because these types cannot ever become complete. */
5343 parmlist_tags_warning ()
5348 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5350 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5351 /* An anonymous union parm type is meaningful as a GNU extension.
5352 So don't warn for that. */
5353 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5355 if (TREE_PURPOSE (elt) != 0)
5357 if (code == RECORD_TYPE)
5358 warning ("`struct %s' declared inside parameter list",
5359 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5360 else if (code == UNION_TYPE)
5361 warning ("`union %s' declared inside parameter list",
5362 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5364 warning ("`enum %s' declared inside parameter list",
5365 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5369 /* For translation these need to be separate warnings */
5370 if (code == RECORD_TYPE)
5371 warning ("anonymous struct declared inside parameter list");
5372 else if (code == UNION_TYPE)
5373 warning ("anonymous union declared inside parameter list");
5375 warning ("anonymous enum declared inside parameter list");
5379 warning ("its scope is only this definition or declaration, which is probably not what you want");
5385 /* Get the struct, enum or union (CODE says which) with tag NAME.
5386 Define the tag as a forward-reference if it is not defined. */
5389 xref_tag (code, name)
5390 enum tree_code code;
5393 /* If a cross reference is requested, look up the type
5394 already defined for this tag and return it. */
5396 tree ref = lookup_tag (code, name, current_binding_level, 0);
5397 /* If this is the right type of tag, return what we found.
5398 (This reference will be shadowed by shadow_tag later if appropriate.)
5399 If this is the wrong type of tag, do not return it. If it was the
5400 wrong type in the same binding level, we will have had an error
5401 message already; if in a different binding level and declaring
5402 a name, pending_xref_error will give an error message; but if in a
5403 different binding level and not declaring a name, this tag should
5404 shadow the previous declaration of a different type of tag, and
5405 this would not work properly if we return the reference found.
5406 (For example, with "struct foo" in an outer scope, "union foo;"
5407 must shadow that tag with a new one of union type.) */
5408 if (ref && TREE_CODE (ref) == code)
5411 /* If no such tag is yet defined, create a forward-reference node
5412 and record it as the "definition".
5413 When a real declaration of this type is found,
5414 the forward-reference will be altered into a real type. */
5416 ref = make_node (code);
5417 if (code == ENUMERAL_TYPE)
5419 /* Give the type a default layout like unsigned int
5420 to avoid crashing if it does not get defined. */
5421 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5422 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5423 TYPE_USER_ALIGN (ref) = 0;
5424 TREE_UNSIGNED (ref) = 1;
5425 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5426 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5427 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5430 pushtag (name, ref);
5435 /* Make sure that the tag NAME is defined *in the current binding level*
5436 at least as a forward reference.
5437 CODE says which kind of tag NAME ought to be. */
5440 start_struct (code, name)
5441 enum tree_code code;
5444 /* If there is already a tag defined at this binding level
5445 (as a forward reference), just return it. */
5450 ref = lookup_tag (code, name, current_binding_level, 1);
5451 if (ref && TREE_CODE (ref) == code)
5453 C_TYPE_BEING_DEFINED (ref) = 1;
5454 TYPE_PACKED (ref) = flag_pack_struct;
5455 if (TYPE_FIELDS (ref))
5457 if (code == UNION_TYPE)
5458 error ("redefinition of `union %s'",
5459 IDENTIFIER_POINTER (name));
5461 error ("redefinition of `struct %s'",
5462 IDENTIFIER_POINTER (name));
5468 /* Otherwise create a forward-reference just so the tag is in scope. */
5470 ref = make_node (code);
5471 pushtag (name, ref);
5472 C_TYPE_BEING_DEFINED (ref) = 1;
5473 TYPE_PACKED (ref) = flag_pack_struct;
5477 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5478 of a structure component, returning a FIELD_DECL node.
5479 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5481 This is done during the parsing of the struct declaration.
5482 The FIELD_DECL nodes are chained together and the lot of them
5483 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5486 grokfield (filename, line, declarator, declspecs, width)
5487 const char *filename ATTRIBUTE_UNUSED;
5488 int line ATTRIBUTE_UNUSED;
5489 tree declarator, declspecs, width;
5493 if (declarator == NULL_TREE && width == NULL_TREE)
5495 /* This is an unnamed decl. We only support unnamed
5496 structs/unions, so check for other things and refuse them. */
5497 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5498 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5500 error ("unnamed fields of type other than struct or union are not allowed");
5505 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5507 finish_decl (value, NULL_TREE, NULL_TREE);
5508 DECL_INITIAL (value) = width;
5510 maybe_objc_check_decl (value);
5514 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5515 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5516 ATTRIBUTES are attributes to be applied to the structure. */
5519 finish_struct (t, fieldlist, attributes)
5525 int toplevel = global_binding_level == current_binding_level;
5526 int saw_named_field;
5528 /* If this type was previously laid out as a forward reference,
5529 make sure we lay it out again. */
5533 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5535 /* Nameless union parm types are useful as GCC extension. */
5536 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5537 /* Otherwise, warn about any struct or union def. in parmlist. */
5538 if (in_parm_level_p ())
5541 pedwarn ("%s defined inside parms",
5542 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5543 else if (! flag_traditional)
5544 warning ("%s defined inside parms",
5545 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5550 for (x = fieldlist; x; x = TREE_CHAIN (x))
5551 if (DECL_NAME (x) != 0)
5555 pedwarn ("%s has no %s",
5556 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5557 fieldlist ? _("named members") : _("members"));
5560 /* Install struct as DECL_CONTEXT of each field decl.
5561 Also process specified field sizes,m which is found in the DECL_INITIAL.
5562 Store 0 there, except for ": 0" fields (so we can find them
5563 and delete them, below). */
5565 saw_named_field = 0;
5566 for (x = fieldlist; x; x = TREE_CHAIN (x))
5568 DECL_CONTEXT (x) = t;
5569 DECL_PACKED (x) |= TYPE_PACKED (t);
5571 /* If any field is const, the structure type is pseudo-const. */
5572 if (TREE_READONLY (x))
5573 C_TYPE_FIELDS_READONLY (t) = 1;
5576 /* A field that is pseudo-const makes the structure likewise. */
5577 tree t1 = TREE_TYPE (x);
5578 while (TREE_CODE (t1) == ARRAY_TYPE)
5579 t1 = TREE_TYPE (t1);
5580 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5581 && C_TYPE_FIELDS_READONLY (t1))
5582 C_TYPE_FIELDS_READONLY (t) = 1;
5585 /* Any field that is volatile means variables of this type must be
5586 treated in some ways as volatile. */
5587 if (TREE_THIS_VOLATILE (x))
5588 C_TYPE_FIELDS_VOLATILE (t) = 1;
5590 /* Any field of nominal variable size implies structure is too. */
5591 if (C_DECL_VARIABLE_SIZE (x))
5592 C_TYPE_VARIABLE_SIZE (t) = 1;
5594 /* Detect invalid nested redefinition. */
5595 if (TREE_TYPE (x) == t)
5596 error ("nested redefinition of `%s'",
5597 IDENTIFIER_POINTER (TYPE_NAME (t)));
5599 /* Detect invalid bit-field size. */
5600 if (DECL_INITIAL (x))
5601 STRIP_NOPS (DECL_INITIAL (x));
5602 if (DECL_INITIAL (x))
5604 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5605 constant_expression_warning (DECL_INITIAL (x));
5609 "bit-field `%s' width not an integer constant");
5610 DECL_INITIAL (x) = NULL;
5614 /* Detect invalid bit-field type. */
5615 if (DECL_INITIAL (x)
5616 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5617 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5618 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5620 error_with_decl (x, "bit-field `%s' has invalid type");
5621 DECL_INITIAL (x) = NULL;
5624 if (DECL_INITIAL (x) && pedantic
5625 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5626 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5627 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5628 /* Accept an enum that's equivalent to int or unsigned int. */
5629 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5630 && (TYPE_PRECISION (TREE_TYPE (x))
5631 == TYPE_PRECISION (integer_type_node))))
5632 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5634 /* Detect and ignore out of range field width and process valid
5636 if (DECL_INITIAL (x))
5639 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5640 max_width = CHAR_TYPE_SIZE;
5642 max_width = TYPE_PRECISION (TREE_TYPE (x));
5643 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5644 error_with_decl (x, "negative width in bit-field `%s'");
5645 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5646 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5647 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5648 error_with_decl (x, "zero width for bit-field `%s'");
5651 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5652 unsigned HOST_WIDE_INT width
5653 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5655 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5656 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5657 TREE_UNSIGNED (TREE_TYPE (x)))
5659 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5660 TREE_UNSIGNED (TREE_TYPE (x))))))
5661 warning_with_decl (x,
5662 "`%s' is narrower than values of its type");
5664 DECL_SIZE (x) = bitsize_int (width);
5665 DECL_BIT_FIELD (x) = 1;
5666 SET_DECL_C_BIT_FIELD (x);
5670 /* field size 0 => force desired amount of alignment. */
5671 #ifdef EMPTY_FIELD_BOUNDARY
5672 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5674 #ifdef PCC_BITFIELD_TYPE_MATTERS
5675 if (PCC_BITFIELD_TYPE_MATTERS)
5677 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5678 TYPE_ALIGN (TREE_TYPE (x)));
5679 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5686 else if (TREE_TYPE (x) != error_mark_node)
5688 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5689 : TYPE_ALIGN (TREE_TYPE (x)));
5691 /* Non-bit-fields are aligned for their type, except packed
5692 fields which require only BITS_PER_UNIT alignment. */
5693 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5694 if (! DECL_PACKED (x))
5695 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5698 DECL_INITIAL (x) = 0;
5700 /* Detect flexible array member in an invalid context. */
5701 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5702 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5703 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5704 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5706 if (TREE_CODE (t) == UNION_TYPE)
5707 error_with_decl (x, "flexible array member in union");
5708 else if (TREE_CHAIN (x) != NULL_TREE)
5709 error_with_decl (x, "flexible array member not at end of struct");
5710 else if (! saw_named_field)
5711 error_with_decl (x, "flexible array member in otherwise empty struct");
5714 saw_named_field = 1;
5717 /* Delete all duplicate fields from the fieldlist */
5718 for (x = fieldlist; x && TREE_CHAIN (x);)
5719 /* Anonymous fields aren't duplicates. */
5720 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5728 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5734 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5736 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5737 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5743 /* Now we have the nearly final fieldlist. Record it,
5744 then lay out the structure or union (including the fields). */
5746 TYPE_FIELDS (t) = fieldlist;
5750 /* Delete all zero-width bit-fields from the fieldlist */
5752 tree *fieldlistp = &fieldlist;
5754 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5755 *fieldlistp = TREE_CHAIN (*fieldlistp);
5757 fieldlistp = &TREE_CHAIN (*fieldlistp);
5760 /* Now we have the truly final field list.
5761 Store it in this type and in the variants. */
5763 TYPE_FIELDS (t) = fieldlist;
5765 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5767 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5768 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5769 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5770 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5773 /* If this was supposed to be a transparent union, but we can't
5774 make it one, warn and turn off the flag. */
5775 if (TREE_CODE (t) == UNION_TYPE
5776 && TYPE_TRANSPARENT_UNION (t)
5777 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5779 TYPE_TRANSPARENT_UNION (t) = 0;
5780 warning ("union cannot be made transparent");
5783 /* If this structure or union completes the type of any previous
5784 variable declaration, lay it out and output its rtl. */
5786 if (current_binding_level->n_incomplete != 0)
5789 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5791 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5792 && TREE_CODE (decl) != TYPE_DECL)
5794 layout_decl (decl, 0);
5795 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5796 maybe_objc_check_decl (decl);
5797 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5800 if (--current_binding_level->n_incomplete == 0)
5803 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5804 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5806 tree element = TREE_TYPE (decl);
5807 while (TREE_CODE (element) == ARRAY_TYPE)
5808 element = TREE_TYPE (element);
5811 layout_array_type (TREE_TYPE (decl));
5812 if (TREE_CODE (decl) != TYPE_DECL)
5814 layout_decl (decl, 0);
5815 maybe_objc_check_decl (decl);
5816 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5820 if (--current_binding_level->n_incomplete == 0)
5827 /* Finish debugging output for this type. */
5828 rest_of_type_compilation (t, toplevel);
5833 /* Lay out the type T, and its element type, and so on. */
5836 layout_array_type (t)
5839 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5840 layout_array_type (TREE_TYPE (t));
5844 /* Begin compiling the definition of an enumeration type.
5845 NAME is its name (or null if anonymous).
5846 Returns the type object, as yet incomplete.
5847 Also records info about it so that build_enumerator
5848 may be used to declare the individual values as they are read. */
5856 /* If this is the real definition for a previous forward reference,
5857 fill in the contents in the same object that used to be the
5858 forward reference. */
5861 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5863 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5865 enumtype = make_node (ENUMERAL_TYPE);
5866 pushtag (name, enumtype);
5869 C_TYPE_BEING_DEFINED (enumtype) = 1;
5871 if (TYPE_VALUES (enumtype) != 0)
5873 /* This enum is a named one that has been declared already. */
5874 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5876 /* Completely replace its old definition.
5877 The old enumerators remain defined, however. */
5878 TYPE_VALUES (enumtype) = 0;
5881 enum_next_value = integer_zero_node;
5884 if (flag_short_enums)
5885 TYPE_PACKED (enumtype) = 1;
5890 /* After processing and defining all the values of an enumeration type,
5891 install their decls in the enumeration type and finish it off.
5892 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5893 and ATTRIBUTES are the specified attributes.
5894 Returns ENUMTYPE. */
5897 finish_enum (enumtype, values, attributes)
5903 tree minnode = 0, maxnode = 0, enum_value_type;
5904 int precision, unsign;
5905 int toplevel = (global_binding_level == current_binding_level);
5907 if (in_parm_level_p ())
5908 warning ("enum defined inside parms");
5910 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5912 /* Calculate the maximum value of any enumerator in this type. */
5914 if (values == error_mark_node)
5915 minnode = maxnode = integer_zero_node;
5918 minnode = maxnode = TREE_VALUE (values);
5919 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5921 tree value = TREE_VALUE (pair);
5922 if (tree_int_cst_lt (maxnode, value))
5924 if (tree_int_cst_lt (value, minnode))
5929 /* Construct the final type of this enumeration. It is the same
5930 as one of the integral types - the narrowest one that fits, except
5931 that normally we only go as narrow as int - and signed iff any of
5932 the values are negative. */
5933 unsign = (tree_int_cst_sgn (minnode) >= 0);
5934 precision = MAX (min_precision (minnode, unsign),
5935 min_precision (maxnode, unsign));
5936 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5938 tree narrowest = type_for_size (precision, unsign);
5941 warning ("enumeration values exceed range of largest integer");
5942 narrowest = long_long_integer_type_node;
5945 precision = TYPE_PRECISION (narrowest);
5948 precision = TYPE_PRECISION (integer_type_node);
5950 if (precision == TYPE_PRECISION (integer_type_node))
5951 enum_value_type = type_for_size (precision, 0);
5953 enum_value_type = enumtype;
5955 TYPE_MIN_VALUE (enumtype) = minnode;
5956 TYPE_MAX_VALUE (enumtype) = maxnode;
5957 TYPE_PRECISION (enumtype) = precision;
5958 TREE_UNSIGNED (enumtype) = unsign;
5959 TYPE_SIZE (enumtype) = 0;
5960 layout_type (enumtype);
5962 if (values != error_mark_node)
5964 /* Change the type of the enumerators to be the enum type. We
5965 need to do this irrespective of the size of the enum, for
5966 proper type checking. Replace the DECL_INITIALs of the
5967 enumerators, and the value slots of the list, with copies
5968 that have the enum type; they cannot be modified in place
5969 because they may be shared (e.g. integer_zero_node) Finally,
5970 change the purpose slots to point to the names of the decls. */
5971 for (pair = values; pair; pair = TREE_CHAIN (pair))
5973 tree enu = TREE_PURPOSE (pair);
5975 TREE_TYPE (enu) = enumtype;
5976 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5977 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5978 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5979 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5980 DECL_MODE (enu) = TYPE_MODE (enumtype);
5982 /* The ISO C Standard mandates enumerators to have type int,
5983 even though the underlying type of an enum type is
5984 unspecified. Here we convert any enumerators that fit in
5985 an int to type int, to avoid promotions to unsigned types
5986 when comparing integers with enumerators that fit in the
5987 int range. When -pedantic is given, build_enumerator()
5988 would have already taken care of those that don't fit. */
5989 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5990 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5992 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5994 TREE_PURPOSE (pair) = DECL_NAME (enu);
5995 TREE_VALUE (pair) = DECL_INITIAL (enu);
5998 TYPE_VALUES (enumtype) = values;
6001 /* Fix up all variant types of this enum type. */
6002 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6004 if (tem == enumtype)
6006 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6007 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6008 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6009 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6010 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6011 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6012 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6013 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6014 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
6015 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6018 /* Finish debugging output for this type. */
6019 rest_of_type_compilation (enumtype, toplevel);
6024 /* Build and install a CONST_DECL for one value of the
6025 current enumeration type (one that was begun with start_enum).
6026 Return a tree-list containing the CONST_DECL and its value.
6027 Assignment of sequential values by default is handled here. */
6030 build_enumerator (name, value)
6035 /* Validate and default VALUE. */
6037 /* Remove no-op casts from the value. */
6039 STRIP_TYPE_NOPS (value);
6043 if (TREE_CODE (value) == INTEGER_CST)
6045 value = default_conversion (value);
6046 constant_expression_warning (value);
6050 error ("enumerator value for `%s' not integer constant",
6051 IDENTIFIER_POINTER (name));
6056 /* Default based on previous value. */
6057 /* It should no longer be possible to have NON_LVALUE_EXPR
6061 value = enum_next_value;
6063 error ("overflow in enumeration values");
6066 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6068 pedwarn ("ISO C restricts enumerator values to range of `int'");
6069 value = convert (integer_type_node, value);
6072 /* Set basis for default for next value. */
6073 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6074 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6076 /* Now create a declaration for the enum value name. */
6078 type = TREE_TYPE (value);
6079 type = type_for_size (MAX (TYPE_PRECISION (type),
6080 TYPE_PRECISION (integer_type_node)),
6082 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6083 && TREE_UNSIGNED (type)));
6085 decl = build_decl (CONST_DECL, name, type);
6086 DECL_INITIAL (decl) = convert (type, value);
6089 return tree_cons (decl, value, NULL_TREE);
6093 /* Create the FUNCTION_DECL for a function definition.
6094 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6095 the declaration; they describe the function's name and the type it returns,
6096 but twisted together in a fashion that parallels the syntax of C.
6098 This function creates a binding context for the function body
6099 as well as setting up the FUNCTION_DECL in current_function_decl.
6101 Returns 1 on success. If the DECLARATOR is not suitable for a function
6102 (it defines a datum instead), we return 0, which tells
6103 yyparse to report a parse error. */
6106 start_function (declspecs, declarator, attributes)
6107 tree declarator, declspecs, attributes;
6109 tree decl1, old_decl;
6111 int old_immediate_size_expand = immediate_size_expand;
6113 current_function_returns_value = 0; /* Assume, until we see it does. */
6114 current_function_returns_null = 0;
6115 warn_about_return_type = 0;
6116 current_extern_inline = 0;
6117 c_function_varargs = 0;
6119 shadowed_labels = 0;
6121 /* Don't expand any sizes in the return type of the function. */
6122 immediate_size_expand = 0;
6124 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6126 /* If the declarator is not suitable for a function definition,
6127 cause a syntax error. */
6130 immediate_size_expand = old_immediate_size_expand;
6134 decl_attributes (&decl1, attributes, 0);
6136 if (DECL_DECLARED_INLINE_P (decl1)
6137 && DECL_UNINLINABLE (decl1)
6138 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6139 warning_with_decl (decl1,
6140 "inline function `%s' given attribute noinline");
6142 announce_function (decl1);
6144 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6146 error ("return type is an incomplete type");
6147 /* Make it return void instead. */
6149 = build_function_type (void_type_node,
6150 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6153 if (warn_about_return_type)
6154 pedwarn_c99 ("return type defaults to `int'");
6156 /* Save the parm names or decls from this function's declarator
6157 where store_parm_decls will find them. */
6158 current_function_parms = last_function_parms;
6159 current_function_parm_tags = last_function_parm_tags;
6161 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6162 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6163 DECL_INITIAL (decl1) = error_mark_node;
6165 /* If this definition isn't a prototype and we had a prototype declaration
6166 before, copy the arg type info from that prototype.
6167 But not if what we had before was a builtin function. */
6168 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6169 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6170 && !DECL_BUILT_IN (old_decl)
6171 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6172 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6173 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6175 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6176 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6177 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6180 /* If there is no explicit declaration, look for any out-of-scope implicit
6183 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6185 /* Optionally warn of old-fashioned def with no previous prototype. */
6186 if (warn_strict_prototypes
6187 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6189 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6190 || (DECL_BUILT_IN (old_decl)
6191 && ! C_DECL_ANTICIPATED (old_decl)))))
6192 warning ("function declaration isn't a prototype");
6193 /* Optionally warn of any global def with no previous prototype. */
6194 else if (warn_missing_prototypes
6195 && TREE_PUBLIC (decl1)
6197 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6198 || (DECL_BUILT_IN (old_decl)
6199 && ! C_DECL_ANTICIPATED (old_decl))))
6200 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6201 warning_with_decl (decl1, "no previous prototype for `%s'");
6202 /* Optionally warn of any def with no previous prototype
6203 if the function has already been used. */
6204 else if (warn_missing_prototypes
6205 && old_decl != 0 && TREE_USED (old_decl)
6206 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6207 warning_with_decl (decl1,
6208 "`%s' was used with no prototype before its definition");
6209 /* Optionally warn of any global def with no previous declaration. */
6210 else if (warn_missing_declarations
6211 && TREE_PUBLIC (decl1)
6213 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6214 warning_with_decl (decl1, "no previous declaration for `%s'");
6215 /* Optionally warn of any def with no previous declaration
6216 if the function has already been used. */
6217 else if (warn_missing_declarations
6218 && old_decl != 0 && TREE_USED (old_decl)
6219 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6220 warning_with_decl (decl1,
6221 "`%s' was used with no declaration before its definition");
6223 /* This is a definition, not a reference.
6224 So normally clear DECL_EXTERNAL.
6225 However, `extern inline' acts like a declaration
6226 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6227 DECL_EXTERNAL (decl1) = current_extern_inline;
6229 /* This function exists in static storage.
6230 (This does not mean `static' in the C sense!) */
6231 TREE_STATIC (decl1) = 1;
6233 /* A nested function is not global. */
6234 if (current_function_decl != 0)
6235 TREE_PUBLIC (decl1) = 0;
6237 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6238 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6243 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6244 != integer_type_node)
6245 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6247 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6248 args = TREE_CHAIN (args))
6250 tree type = args ? TREE_VALUE (args) : 0;
6252 if (type == void_type_node)
6259 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6260 pedwarn_with_decl (decl1,
6261 "first argument of `%s' should be `int'");
6265 if (TREE_CODE (type) != POINTER_TYPE
6266 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6267 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6269 pedwarn_with_decl (decl1,
6270 "second argument of `%s' should be `char **'");
6274 if (TREE_CODE (type) != POINTER_TYPE
6275 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6276 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6278 pedwarn_with_decl (decl1,
6279 "third argument of `%s' should probably be `char **'");
6284 /* It is intentional that this message does not mention the third
6285 argument because it's only mentioned in an appendix of the
6287 if (argct > 0 && (argct < 2 || argct > 3))
6288 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6290 if (! TREE_PUBLIC (decl1))
6291 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6294 /* Record the decl so that the function name is defined.
6295 If we already have a decl for this name, and it is a FUNCTION_DECL,
6296 use the old decl. */
6298 current_function_decl = pushdecl (decl1);
6301 declare_parm_level (1);
6302 current_binding_level->subblocks_tag_transparent = 1;
6304 make_decl_rtl (current_function_decl, NULL);
6306 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6307 /* Promote the value to int before returning it. */
6308 if (c_promoting_integer_type_p (restype))
6310 /* It retains unsignedness if traditional
6311 or if not really getting wider. */
6312 if (TREE_UNSIGNED (restype)
6313 && (flag_traditional
6314 || (TYPE_PRECISION (restype)
6315 == TYPE_PRECISION (integer_type_node))))
6316 restype = unsigned_type_node;
6318 restype = integer_type_node;
6320 DECL_RESULT (current_function_decl)
6321 = build_decl (RESULT_DECL, NULL_TREE, restype);
6323 /* If this fcn was already referenced via a block-scope `extern' decl
6324 (or an implicit decl), propagate certain information about the usage. */
6325 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6326 TREE_ADDRESSABLE (current_function_decl) = 1;
6328 immediate_size_expand = old_immediate_size_expand;
6330 start_fname_decls ();
6335 /* Record that this function is going to be a varargs function.
6336 This is called before store_parm_decls, which is too early
6337 to call mark_varargs directly. */
6342 c_function_varargs = 1;
6345 /* Store the parameter declarations into the current function declaration.
6346 This is called after parsing the parameter declarations, before
6347 digesting the body of the function.
6349 For an old-style definition, modify the function's type
6350 to specify at least the number of arguments. */
6355 tree fndecl = current_function_decl;
6358 /* This is either a chain of PARM_DECLs (if a prototype was used)
6359 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6360 tree specparms = current_function_parms;
6362 /* This is a list of types declared among parms in a prototype. */
6363 tree parmtags = current_function_parm_tags;
6365 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6366 tree parmdecls = getdecls ();
6368 /* This is a chain of any other decls that came in among the parm
6369 declarations. If a parm is declared with enum {foo, bar} x;
6370 then CONST_DECLs for foo and bar are put here. */
6373 /* The function containing FNDECL, if any. */
6374 tree context = decl_function_context (fndecl);
6376 /* Nonzero if this definition is written with a prototype. */
6379 int saved_warn_shadow = warn_shadow;
6381 /* Don't re-emit shadow warnings. */
6384 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6386 /* This case is when the function was defined with an ANSI prototype.
6387 The parms already have decls, so we need not do anything here
6388 except record them as in effect
6389 and complain if any redundant old-style parm decls were written. */
6400 error_with_decl (fndecl,
6401 "parm types given both in parmlist and separately");
6402 /* Get rid of the erroneous decls; don't keep them on
6403 the list of parms, since they might not be PARM_DECLs. */
6404 for (decl = current_binding_level->names;
6405 decl; decl = TREE_CHAIN (decl))
6406 if (DECL_NAME (decl))
6407 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6408 for (link = current_binding_level->shadowed;
6409 link; link = TREE_CHAIN (link))
6410 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6411 current_binding_level->names = 0;
6412 current_binding_level->shadowed = 0;
6415 specparms = nreverse (specparms);
6416 for (parm = specparms; parm; parm = next)
6418 next = TREE_CHAIN (parm);
6419 if (TREE_CODE (parm) == PARM_DECL)
6421 if (DECL_NAME (parm) == 0)
6422 error_with_decl (parm, "parameter name omitted");
6423 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6424 && VOID_TYPE_P (TREE_TYPE (parm)))
6426 error_with_decl (parm, "parameter `%s' declared void");
6427 /* Change the type to error_mark_node so this parameter
6428 will be ignored by assign_parms. */
6429 TREE_TYPE (parm) = error_mark_node;
6435 /* If we find an enum constant or a type tag,
6436 put it aside for the moment. */
6437 TREE_CHAIN (parm) = 0;
6438 others = chainon (others, parm);
6442 /* Get the decls in their original chain order
6443 and record in the function. */
6444 DECL_ARGUMENTS (fndecl) = getdecls ();
6447 /* If this function takes a variable number of arguments,
6448 add a phony parameter to the end of the parm list,
6449 to represent the position of the first unnamed argument. */
6450 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6453 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6454 /* Let's hope the address of the unnamed parm
6455 won't depend on its type. */
6456 TREE_TYPE (dummy) = integer_type_node;
6457 DECL_ARG_TYPE (dummy) = integer_type_node;
6458 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6462 /* Now pushdecl the enum constants. */
6463 for (parm = others; parm; parm = next)
6465 next = TREE_CHAIN (parm);
6466 if (DECL_NAME (parm) == 0)
6468 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6470 else if (TREE_CODE (parm) != PARM_DECL)
6474 storetags (chainon (parmtags, gettags ()));
6478 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6479 each with a parm name as the TREE_VALUE.
6481 PARMDECLS is a chain of declarations for parameters.
6482 Warning! It can also contain CONST_DECLs which are not parameters
6483 but are names of enumerators of any enum types
6484 declared among the parameters.
6486 First match each formal parameter name with its declaration.
6487 Associate decls with the names and store the decls
6488 into the TREE_PURPOSE slots. */
6490 /* We use DECL_WEAK as a flag to show which parameters have been
6491 seen already since it is not used on PARM_DECL or CONST_DECL. */
6492 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6493 DECL_WEAK (parm) = 0;
6495 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6497 tree tail, found = NULL;
6499 if (TREE_VALUE (parm) == 0)
6501 error_with_decl (fndecl,
6502 "parameter name missing from parameter list");
6503 TREE_PURPOSE (parm) = 0;
6507 /* See if any of the parmdecls specifies this parm by name.
6508 Ignore any enumerator decls. */
6509 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6510 if (DECL_NAME (tail) == TREE_VALUE (parm)
6511 && TREE_CODE (tail) == PARM_DECL)
6517 /* If declaration already marked, we have a duplicate name.
6518 Complain, and don't use this decl twice. */
6519 if (found && DECL_WEAK (found))
6521 error_with_decl (found, "multiple parameters named `%s'");
6525 /* If the declaration says "void", complain and ignore it. */
6526 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6528 error_with_decl (found, "parameter `%s' declared void");
6529 TREE_TYPE (found) = integer_type_node;
6530 DECL_ARG_TYPE (found) = integer_type_node;
6531 layout_decl (found, 0);
6534 /* Traditionally, a parm declared float is actually a double. */
6535 if (found && flag_traditional
6536 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6538 TREE_TYPE (found) = double_type_node;
6539 DECL_ARG_TYPE (found) = double_type_node;
6540 layout_decl (found, 0);
6543 /* If no declaration found, default to int. */
6546 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6548 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6549 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6550 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6552 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6553 else if (extra_warnings)
6554 warning_with_decl (found, "type of `%s' defaults to `int'");
6558 TREE_PURPOSE (parm) = found;
6560 /* Mark this decl as "already found". */
6561 DECL_WEAK (found) = 1;
6564 /* Put anything which is on the parmdecls chain and which is
6565 not a PARM_DECL onto the list NONPARMS. (The types of
6566 non-parm things which might appear on the list include
6567 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6568 any actual PARM_DECLs not matched with any names. */
6571 for (parm = parmdecls; parm;)
6573 tree next = TREE_CHAIN (parm);
6574 TREE_CHAIN (parm) = 0;
6576 if (TREE_CODE (parm) != PARM_DECL)
6577 nonparms = chainon (nonparms, parm);
6580 /* Complain about args with incomplete types. */
6581 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6583 error_with_decl (parm, "parameter `%s' has incomplete type");
6584 TREE_TYPE (parm) = error_mark_node;
6587 if (! DECL_WEAK (parm))
6589 error_with_decl (parm,
6590 "declaration for parameter `%s' but no such parameter");
6591 /* Pretend the parameter was not missing.
6592 This gets us to a standard state and minimizes
6593 further error messages. */
6595 = chainon (specparms,
6596 tree_cons (parm, NULL_TREE, NULL_TREE));
6603 /* Chain the declarations together in the order of the list of
6604 names. Store that chain in the function decl, replacing the
6607 DECL_ARGUMENTS (fndecl) = 0;
6610 for (last = 0; parm; parm = TREE_CHAIN (parm))
6611 if (TREE_PURPOSE (parm))
6614 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6616 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6617 last = TREE_PURPOSE (parm);
6618 TREE_CHAIN (last) = 0;
6622 /* If there was a previous prototype,
6623 set the DECL_ARG_TYPE of each argument according to
6624 the type previously specified, and report any mismatches. */
6626 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6629 for (parm = DECL_ARGUMENTS (fndecl),
6630 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6631 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6632 != void_type_node));
6633 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6635 if (parm == 0 || type == 0
6636 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6638 error ("number of arguments doesn't match prototype");
6639 error_with_file_and_line (current_function_prototype_file,
6640 current_function_prototype_line,
6641 "prototype declaration");
6644 /* Type for passing arg must be consistent with that
6645 declared for the arg. ISO C says we take the unqualified
6646 type for parameters declared with qualified type. */
6647 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6648 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6650 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6651 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6653 /* Adjust argument to match prototype. E.g. a previous
6654 `int foo(float);' prototype causes
6655 `int foo(x) float x; {...}' to be treated like
6656 `int foo(float x) {...}'. This is particularly
6657 useful for argument types like uid_t. */
6658 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6660 if (PROMOTE_PROTOTYPES
6661 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6662 && TYPE_PRECISION (TREE_TYPE (parm))
6663 < TYPE_PRECISION (integer_type_node))
6664 DECL_ARG_TYPE (parm) = integer_type_node;
6668 pedwarn ("promoted argument `%s' doesn't match prototype",
6669 IDENTIFIER_POINTER (DECL_NAME (parm)));
6670 warning_with_file_and_line
6671 (current_function_prototype_file,
6672 current_function_prototype_line,
6673 "prototype declaration");
6676 /* If -traditional, allow `int' argument to match
6677 `unsigned' prototype. */
6678 else if (! (flag_traditional
6679 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6680 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6682 error ("argument `%s' doesn't match prototype",
6683 IDENTIFIER_POINTER (DECL_NAME (parm)));
6684 error_with_file_and_line (current_function_prototype_file,
6685 current_function_prototype_line,
6686 "prototype declaration");
6690 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6693 /* Otherwise, create a prototype that would match. */
6697 tree actual = 0, last = 0, type;
6699 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6701 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6703 TREE_CHAIN (last) = type;
6708 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6710 TREE_CHAIN (last) = type;
6714 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6715 of the type of this function, but we need to avoid having this
6716 affect the types of other similarly-typed functions, so we must
6717 first force the generation of an identical (but separate) type
6718 node for the relevant function type. The new node we create
6719 will be a variant of the main variant of the original function
6722 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6724 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6727 /* Now store the final chain of decls for the arguments
6728 as the decl-chain of the current lexical scope.
6729 Put the enumerators in as well, at the front so that
6730 DECL_ARGUMENTS is not modified. */
6732 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6735 /* Make sure the binding level for the top of the function body
6736 gets a BLOCK if there are any in the function.
6737 Otherwise, the dbx output is wrong. */
6739 keep_next_if_subblocks = 1;
6741 /* ??? This might be an improvement,
6742 but needs to be thought about some more. */
6744 keep_next_level_flag = 1;
6747 /* Write a record describing this function definition to the prototypes
6748 file (if requested). */
6750 gen_aux_info_record (fndecl, 1, 0, prototype);
6752 /* Initialize the RTL code for the function. */
6753 init_function_start (fndecl, input_filename, lineno);
6755 /* Begin the statement tree for this function. */
6756 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6758 /* If this is a nested function, save away the sizes of any
6759 variable-size types so that we can expand them when generating
6765 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6766 = nreverse (get_pending_sizes ());
6767 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6770 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6773 /* This function is being processed in whole-function mode. */
6774 cfun->x_whole_function_mode_p = 1;
6776 /* Even though we're inside a function body, we still don't want to
6777 call expand_expr to calculate the size of a variable-sized array.
6778 We haven't necessarily assigned RTL to all variables yet, so it's
6779 not safe to try to expand expressions involving them. */
6780 immediate_size_expand = 0;
6781 cfun->x_dont_save_pending_sizes_p = 1;
6783 warn_shadow = saved_warn_shadow;
6786 /* Finish up a function declaration and compile that function
6787 all the way to assembler language output. The free the storage
6788 for the function definition.
6790 This is called after parsing the body of the function definition.
6792 NESTED is nonzero if the function being finished is nested in another. */
6795 finish_function (nested)
6798 tree fndecl = current_function_decl;
6800 /* TREE_READONLY (fndecl) = 1;
6801 This caused &foo to be of type ptr-to-const-function
6802 which then got a warning when stored in a ptr-to-function variable. */
6805 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6807 /* Must mark the RESULT_DECL as being in this function. */
6809 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6811 /* Obey `register' declarations if `setjmp' is called in this fn. */
6812 if (flag_traditional && current_function_calls_setjmp)
6814 setjmp_protect (DECL_INITIAL (fndecl));
6815 setjmp_protect_args ();
6818 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6820 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6821 != integer_type_node)
6823 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6824 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6826 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6830 #ifdef DEFAULT_MAIN_RETURN
6831 /* Make it so that `main' always returns success by default. */
6832 DEFAULT_MAIN_RETURN;
6835 c_expand_return (integer_zero_node);
6840 finish_fname_decls ();
6842 /* Tie off the statement tree for this function. */
6843 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6844 /* Clear out memory we no longer need. */
6845 free_after_parsing (cfun);
6846 /* Since we never call rest_of_compilation, we never clear
6847 CFUN. Do so explicitly. */
6848 free_after_compilation (cfun);
6853 /* Generate RTL for the body of this function. */
6854 c_expand_body (fndecl, nested, 1);
6855 /* Let the error reporting routines know that we're outside a
6856 function. For a nested function, this value is used in
6857 pop_c_function_context and then reset via pop_function_context. */
6858 current_function_decl = NULL;
6862 /* Generate the RTL for a deferred function FNDECL. */
6865 c_expand_deferred_function (fndecl)
6868 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6869 function was deferred, e.g. in duplicate_decls. */
6870 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6872 c_expand_body (fndecl, 0, 0);
6873 current_function_decl = NULL;
6877 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6878 then we are already in the process of generating RTL for another
6879 function. If can_defer_p is zero, we won't attempt to defer the
6880 generation of RTL. */
6883 c_expand_body (fndecl, nested_p, can_defer_p)
6885 int nested_p, can_defer_p;
6887 int uninlinable = 1;
6889 /* There's no reason to do any of the work here if we're only doing
6890 semantic analysis; this code just generates RTL. */
6891 if (flag_syntax_only)
6894 if (flag_inline_trees)
6896 /* First, cache whether the current function is inlinable. Some
6897 predicates depend on cfun and current_function_decl to
6898 function completely. */
6899 timevar_push (TV_INTEGRATION);
6900 uninlinable = ! tree_inlinable_function_p (fndecl);
6902 if (! uninlinable && can_defer_p
6903 /* Save function tree for inlining. Should return 0 if the
6904 language does not support function deferring or the
6905 function could not be deferred. */
6906 && defer_fn (fndecl))
6908 /* Let the back-end know that this function exists. */
6909 (*debug_hooks->deferred_inline_function) (fndecl);
6910 timevar_pop (TV_INTEGRATION);
6914 /* Then, inline any functions called in it. */
6915 optimize_inline_calls (fndecl);
6916 timevar_pop (TV_INTEGRATION);
6919 timevar_push (TV_EXPAND);
6923 /* Make sure that we will evaluate variable-sized types involved
6924 in our function's type. */
6925 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6926 /* Squirrel away our current state. */
6927 push_function_context ();
6930 /* Initialize the RTL code for the function. */
6931 current_function_decl = fndecl;
6932 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6934 /* This function is being processed in whole-function mode. */
6935 cfun->x_whole_function_mode_p = 1;
6937 /* Even though we're inside a function body, we still don't want to
6938 call expand_expr to calculate the size of a variable-sized array.
6939 We haven't necessarily assigned RTL to all variables yet, so it's
6940 not safe to try to expand expressions involving them. */
6941 immediate_size_expand = 0;
6942 cfun->x_dont_save_pending_sizes_p = 1;
6944 /* If this is a varargs function, inform function.c. */
6945 if (c_function_varargs)
6948 /* Set up parameters and prepare for return, for the function. */
6949 expand_function_start (fndecl, 0);
6951 /* If this function is `main', emit a call to `__main'
6952 to run global initializers, etc. */
6953 if (DECL_NAME (fndecl)
6954 && MAIN_NAME_P (DECL_NAME (fndecl))
6955 && DECL_CONTEXT (fndecl) == NULL_TREE)
6956 expand_main_function ();
6958 /* Generate the RTL for this function. */
6959 expand_stmt (DECL_SAVED_TREE (fndecl));
6962 /* Allow the body of the function to be garbage collected. */
6963 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6966 /* We hard-wired immediate_size_expand to zero above.
6967 expand_function_end will decrement this variable. So, we set the
6968 variable to one here, so that after the decrement it will remain
6970 immediate_size_expand = 1;
6972 /* Allow language dialects to perform special processing. */
6973 if (lang_expand_function_end)
6974 (*lang_expand_function_end) ();
6976 /* Generate rtl for function exit. */
6977 expand_function_end (input_filename, lineno, 0);
6979 /* If this is a nested function, protect the local variables in the stack
6980 above us from being collected while we're compiling this function. */
6982 ggc_push_context ();
6984 /* Run the optimizers and output the assembler code for this function. */
6985 rest_of_compilation (fndecl);
6987 /* Undo the GC context switch. */
6991 /* With just -W, complain only if function returns both with
6992 and without a value. */
6994 && current_function_returns_value
6995 && current_function_returns_null)
6996 warning ("this function may return with or without a value");
6998 /* If requested, warn about function definitions where the function will
6999 return a value (usually of some struct or union type) which itself will
7000 take up a lot of stack space. */
7002 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7004 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7006 if (ret_type && TYPE_SIZE_UNIT (ret_type)
7007 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
7008 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
7011 unsigned int size_as_int
7012 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
7014 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
7015 warning_with_decl (fndecl,
7016 "size of return value of `%s' is %u bytes",
7019 warning_with_decl (fndecl,
7020 "size of return value of `%s' is larger than %d bytes",
7025 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
7026 && ! flag_inline_trees)
7028 /* Stop pointing to the local nodes about to be freed.
7029 But DECL_INITIAL must remain nonzero so we know this
7030 was an actual function definition.
7031 For a nested function, this is done in pop_c_function_context.
7032 If rest_of_compilation set this to 0, leave it 0. */
7033 if (DECL_INITIAL (fndecl) != 0)
7034 DECL_INITIAL (fndecl) = error_mark_node;
7036 DECL_ARGUMENTS (fndecl) = 0;
7039 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7041 if (targetm.have_ctors_dtors)
7042 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
7043 DEFAULT_INIT_PRIORITY);
7045 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
7048 if (DECL_STATIC_DESTRUCTOR (fndecl))
7050 if (targetm.have_ctors_dtors)
7051 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
7052 DEFAULT_INIT_PRIORITY);
7054 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
7058 /* Return to the enclosing function. */
7059 pop_function_context ();
7060 timevar_pop (TV_EXPAND);
7063 /* Check the declarations given in a for-loop for satisfying the C99
7066 check_for_loop_decls ()
7072 /* If we get here, declarations have been used in a for loop without
7073 the C99 for loop scope. This doesn't make much sense, so don't
7075 error ("`for' loop initial declaration used outside C99 mode");
7078 /* C99 subclause 6.8.5 paragraph 3:
7080 [#3] The declaration part of a for statement shall only
7081 declare identifiers for objects having storage class auto or
7084 It isn't clear whether, in this sentence, "identifiers" binds to
7085 "shall only declare" or to "objects" - that is, whether all identifiers
7086 declared must be identifiers for objects, or whether the restriction
7087 only applies to those that are. (A question on this in comp.std.c
7088 in November 2000 received no answer.) We implement the strictest
7089 interpretation, to avoid creating an extension which later causes
7092 for (t = gettags (); t; t = TREE_CHAIN (t))
7094 if (TREE_PURPOSE (t) != 0)
7096 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7098 if (code == RECORD_TYPE)
7099 error ("`struct %s' declared in `for' loop initial declaration",
7100 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7101 else if (code == UNION_TYPE)
7102 error ("`union %s' declared in `for' loop initial declaration",
7103 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7105 error ("`enum %s' declared in `for' loop initial declaration",
7106 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7110 for (t = getdecls (); t; t = TREE_CHAIN (t))
7112 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7113 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7114 else if (TREE_STATIC (t))
7115 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7116 else if (DECL_EXTERNAL (t))
7117 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7121 /* Save and restore the variables in this file and elsewhere
7122 that keep track of the progress of compilation of the current function.
7123 Used for nested functions. */
7125 struct c_language_function
7127 struct language_function base;
7129 tree shadowed_labels;
7132 int warn_about_return_type;
7134 struct binding_level *binding_level;
7137 /* Save and reinitialize the variables
7138 used during compilation of a C function. */
7141 push_c_function_context (f)
7144 struct c_language_function *p;
7145 p = ((struct c_language_function *)
7146 xmalloc (sizeof (struct c_language_function)));
7147 f->language = (struct language_function *) p;
7149 p->base.x_stmt_tree = c_stmt_tree;
7150 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7151 p->named_labels = named_labels;
7152 p->shadowed_labels = shadowed_labels;
7153 p->returns_value = current_function_returns_value;
7154 p->returns_null = current_function_returns_null;
7155 p->warn_about_return_type = warn_about_return_type;
7156 p->extern_inline = current_extern_inline;
7157 p->binding_level = current_binding_level;
7160 /* Restore the variables used during compilation of a C function. */
7163 pop_c_function_context (f)
7166 struct c_language_function *p
7167 = (struct c_language_function *) f->language;
7170 /* Bring back all the labels that were shadowed. */
7171 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7172 if (DECL_NAME (TREE_VALUE (link)) != 0)
7173 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7174 = TREE_VALUE (link);
7176 if (DECL_SAVED_INSNS (current_function_decl) == 0
7177 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7179 /* Stop pointing to the local nodes about to be freed. */
7180 /* But DECL_INITIAL must remain nonzero so we know this
7181 was an actual function definition. */
7182 DECL_INITIAL (current_function_decl) = error_mark_node;
7183 DECL_ARGUMENTS (current_function_decl) = 0;
7186 c_stmt_tree = p->base.x_stmt_tree;
7187 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7188 named_labels = p->named_labels;
7189 shadowed_labels = p->shadowed_labels;
7190 current_function_returns_value = p->returns_value;
7191 current_function_returns_null = p->returns_null;
7192 warn_about_return_type = p->warn_about_return_type;
7193 current_extern_inline = p->extern_inline;
7194 current_binding_level = p->binding_level;
7200 /* Mark the language specific parts of F for GC. */
7203 mark_c_function_context (f)
7206 struct c_language_function *p
7207 = (struct c_language_function *) f->language;
7212 mark_c_language_function (&p->base);
7213 ggc_mark_tree (p->shadowed_labels);
7214 ggc_mark_tree (p->named_labels);
7215 mark_binding_level (&p->binding_level);
7218 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7221 copy_lang_decl (decl)
7224 struct lang_decl *ld;
7226 if (!DECL_LANG_SPECIFIC (decl))
7229 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7230 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7231 sizeof (struct lang_decl));
7232 DECL_LANG_SPECIFIC (decl) = ld;
7235 /* Mark the language specific bits in T for GC. */
7241 if (TREE_CODE (t) == IDENTIFIER_NODE)
7243 struct lang_identifier *i = (struct lang_identifier *) t;
7244 ggc_mark_tree (i->global_value);
7245 ggc_mark_tree (i->local_value);
7246 ggc_mark_tree (i->label_value);
7247 ggc_mark_tree (i->implicit_decl);
7248 ggc_mark_tree (i->error_locus);
7249 ggc_mark_tree (i->limbo_value);
7251 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7252 ggc_mark (TYPE_LANG_SPECIFIC (t));
7253 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7255 ggc_mark (DECL_LANG_SPECIFIC (t));
7256 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7257 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7261 /* The functions below are required for functionality of doing
7262 function at once processing in the C front end. Currently these
7263 functions are not called from anywhere in the C front end, but as
7264 these changes continue, that will change. */
7266 /* Returns non-zero if the current statement is a full expression,
7267 i.e. temporaries created during that statement should be destroyed
7268 at the end of the statement. */
7271 stmts_are_full_exprs_p ()
7276 /* Returns the stmt_tree (if any) to which statements are currently
7277 being added. If there is no active statement-tree, NULL is
7281 current_stmt_tree ()
7283 return &c_stmt_tree;
7286 /* Returns the stack of SCOPE_STMTs for the current function. */
7289 current_scope_stmt_stack ()
7291 return &c_scope_stmt_stack;
7294 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7298 anon_aggr_type_p (node)
7299 tree node ATTRIBUTE_UNUSED;
7304 /* Dummy function in place of callback used by C++. */
7307 extract_interface_info ()
7311 /* Return a new COMPOUND_STMT, after adding it to the current
7315 c_begin_compound_stmt ()
7319 /* Create the COMPOUND_STMT. */
7320 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7325 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7329 c_expand_decl_stmt (t)
7332 tree decl = DECL_STMT_DECL (t);
7334 /* Expand nested functions. */
7335 if (TREE_CODE (decl) == FUNCTION_DECL
7336 && DECL_CONTEXT (decl) == current_function_decl
7337 && DECL_SAVED_TREE (decl))
7338 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7341 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7342 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7345 identifier_global_value (t)
7348 return IDENTIFIER_GLOBAL_VALUE (t);
7351 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7352 otherwise the name is found in ridpointers from RID_INDEX. */
7355 record_builtin_type (rid_index, name, type)
7362 id = ridpointers[(int) rid_index];
7364 id = get_identifier (name);
7365 pushdecl (build_decl (TYPE_DECL, id, type));
7368 /* Build the void_list_node (void_type_node having been created). */
7370 build_void_list_node ()
7372 tree t = build_tree_list (NULL_TREE, void_type_node);