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 GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* Nonzero if we have seen an invalid cross reference
56 to a struct, union, or enum, but not yet printed the message. */
58 tree pending_invalid_xref;
59 /* File and line to appear in the eventual error message. */
60 const char *pending_invalid_xref_file;
61 int pending_invalid_xref_line;
63 /* While defining an enum type, this is 1 plus the last enumerator
64 constant value. Note that will do not have to save this or `enum_overflow'
65 around nested function definition since such a definition could only
66 occur in an enum value expression and we don't use these variables in
69 static tree enum_next_value;
71 /* Nonzero means that there was overflow computing enum_next_value. */
73 static int enum_overflow;
75 /* Parsing a function declarator leaves a list of parameter names
76 or a chain or parameter decls here. */
78 static tree last_function_parms;
80 /* Parsing a function declarator leaves here a chain of structure
81 and enum types declared in the parmlist. */
83 static tree last_function_parm_tags;
85 /* After parsing the declarator that starts a function definition,
86 `start_function' puts here the list of parameter names or chain of decls.
87 `store_parm_decls' finds it here. */
89 static tree current_function_parms;
91 /* Similar, for last_function_parm_tags. */
92 static tree current_function_parm_tags;
94 /* Similar, for the file and line that the prototype came from if this is
95 an old-style definition. */
96 static const char *current_function_prototype_file;
97 static int current_function_prototype_line;
99 /* The current statement tree. */
101 static struct stmt_tree_s c_stmt_tree;
103 /* The current scope statement stack. */
105 static tree c_scope_stmt_stack;
107 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
108 that have names. Here so we can clear out their names' definitions
109 at the end of the function. */
111 static tree named_labels;
113 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
115 static tree shadowed_labels;
117 /* Nonzero when store_parm_decls is called indicates a varargs function.
118 Value not meaningful after store_parm_decls. */
120 static int c_function_varargs;
122 /* Set to 0 at beginning of a function definition, set to 1 if
123 a return statement that specifies a return value is seen. */
125 int current_function_returns_value;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement with no argument is seen. */
130 int current_function_returns_null;
132 /* Set to nonzero by `grokdeclarator' for a function
133 whose return type is defaulted, if warnings for this are desired. */
135 static int warn_about_return_type;
137 /* Nonzero when starting a function declared `extern inline'. */
139 static int current_extern_inline;
141 /* For each binding contour we allocate a binding_level structure
142 * which records the names defined in that contour.
145 * 1) one for each function definition,
146 * where internal declarations of the parameters appear.
147 * 2) one for each compound statement,
148 * to record its declarations.
150 * The current meaning of a name can be found by searching the levels from
151 * the current one out to the global one.
154 /* Note that the information in the `names' component of the global contour
155 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
159 /* A chain of _DECL nodes for all variables, constants, functions,
160 and typedef types. These are in the reverse of the order supplied.
164 /* A list of structure, union and enum definitions,
165 * for looking up tag names.
166 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
167 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
168 * or ENUMERAL_TYPE node.
172 /* For each level, a list of shadowed outer-level local definitions
173 to be restored when this level is popped.
174 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
175 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
178 /* For each level (except not the global one),
179 a chain of BLOCK nodes for all the levels
180 that were entered and exited one level down. */
183 /* The BLOCK node for this level, if one has been preallocated.
184 If 0, the BLOCK is allocated (if needed) when the level is popped. */
187 /* The binding level which this one is contained in (inherits from). */
188 struct binding_level *level_chain;
190 /* Nonzero for the level that holds the parameters of a function. */
193 /* Nonzero if this level "doesn't exist" for tags. */
194 char tag_transparent;
196 /* Nonzero if sublevels of this level "don't exist" for tags.
197 This is set in the parm level of a function definition
198 while reading the function body, so that the outermost block
199 of the function body will be tag-transparent. */
200 char subblocks_tag_transparent;
202 /* Nonzero means make a BLOCK for this level regardless of all else. */
205 /* Nonzero means make a BLOCK if this level has any subblocks. */
206 char keep_if_subblocks;
208 /* Number of decls in `names' that have incomplete
209 structure or union types. */
212 /* A list of decls giving the (reversed) specified order of parms,
213 not including any forward-decls in the parmlist.
214 This is so we can put the parms in proper order for assign_parms. */
218 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
220 /* The binding level currently in effect. */
222 static struct binding_level *current_binding_level;
224 /* A chain of binding_level structures awaiting reuse. */
226 static struct binding_level *free_binding_level;
228 /* The outermost binding level, for names of file scope.
229 This is created when the compiler is started and exists
230 through the entire run. */
232 static struct binding_level *global_binding_level;
234 /* Binding level structures are initialized by copying this one. */
236 static struct binding_level clear_binding_level
237 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
240 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
242 static int keep_next_level_flag;
244 /* Nonzero means make a BLOCK for the next level pushed
245 if it has subblocks. */
247 static int keep_next_if_subblocks;
249 /* The chain of outer levels of label scopes.
250 This uses the same data structure used for binding levels,
251 but it works differently: each link in the chain records
252 saved values of named_labels and shadowed_labels for
253 a label binding level outside the current one. */
255 static struct binding_level *label_level_chain;
257 /* Functions called automatically at the beginning and end of execution. */
259 tree static_ctors, static_dtors;
261 /* Forward declarations. */
263 static struct binding_level * make_binding_level PARAMS ((void));
264 static void mark_binding_level PARAMS ((void *));
265 static void clear_limbo_values PARAMS ((tree));
266 static int duplicate_decls PARAMS ((tree, tree, int));
267 static int redeclaration_error_message PARAMS ((tree, tree));
268 static void storedecls PARAMS ((tree));
269 static void storetags PARAMS ((tree));
270 static tree lookup_tag PARAMS ((enum tree_code, tree,
271 struct binding_level *, int));
272 static tree lookup_tag_reverse PARAMS ((tree));
273 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
275 static tree grokparms PARAMS ((tree, int));
276 static void layout_array_type PARAMS ((tree));
277 static tree c_make_fname_decl PARAMS ((tree, int));
278 static void c_expand_body PARAMS ((tree, int));
280 /* C-specific option variables. */
282 /* Nonzero means allow type mismatches in conditional expressions;
283 just make their values `void'. */
285 int flag_cond_mismatch;
287 /* Nonzero means don't recognize the keyword `asm'. */
291 /* Nonzero means do some things the same way PCC does. */
293 int flag_traditional;
295 /* Nonzero means enable C89 Amendment 1 features. */
299 /* Nonzero means use the ISO C99 dialect of C. */
303 /* Nonzero means that we have builtin functions, and main is an int */
307 /* Nonzero means add default format_arg attributes for functions not
310 int flag_noniso_default_format_attributes = 1;
312 /* Nonzero means to allow single precision math even if we're generally
313 being traditional. */
314 int flag_allow_single_precision = 0;
316 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
318 int flag_signed_bitfields = 1;
319 int explicit_flag_signed_bitfields = 0;
321 /* Nonzero means warn about use of implicit int. */
323 int warn_implicit_int;
325 /* Nonzero means warn about usage of long long when `-pedantic'. */
327 int warn_long_long = 1;
329 /* Nonzero means message about use of implicit function declarations;
330 1 means warning; 2 means error. */
332 int mesg_implicit_function_declaration = -1;
334 /* Nonzero means give string constants the type `const char *'
335 to get extra warnings from them. These warnings will be too numerous
336 to be useful, except in thoroughly ANSIfied programs. */
338 int flag_const_strings;
340 /* Nonzero means warn about pointer casts that can drop a type qualifier
341 from the pointer target type. */
345 /* Nonzero means warn when casting a function call to a type that does
346 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
347 when there is no previous declaration of sqrt or malloc. */
349 int warn_bad_function_cast;
351 /* Warn about functions which might be candidates for format attributes. */
353 int warn_missing_format_attribute;
355 /* Warn about traditional constructs whose meanings changed in ANSI C. */
357 int warn_traditional;
359 /* Nonzero means warn about sizeof(function) or addition/subtraction
360 of function pointers. */
362 int warn_pointer_arith;
364 /* Nonzero means warn for non-prototype function decls
365 or non-prototyped defs without previous prototype. */
367 int warn_strict_prototypes;
369 /* Nonzero means warn for any global function def
370 without separate previous prototype decl. */
372 int warn_missing_prototypes;
374 /* Nonzero means warn for any global function def
375 without separate previous decl. */
377 int warn_missing_declarations;
379 /* Nonzero means warn about multiple (redundant) decls for the same single
380 variable or function. */
382 int warn_redundant_decls = 0;
384 /* Nonzero means warn about extern declarations of objects not at
385 file-scope level and about *all* declarations of functions (whether
386 extern or static) not at file-scope level. Note that we exclude
387 implicit function declarations. To get warnings about those, use
390 int warn_nested_externs = 0;
392 /* Warn about a subscript that has type char. */
394 int warn_char_subscripts = 0;
396 /* Warn if a type conversion is done that might have confusing results. */
400 /* Warn if adding () is suggested. */
402 int warn_parentheses;
404 /* Warn if initializer is not completely bracketed. */
406 int warn_missing_braces;
408 /* Warn if main is suspicious. */
412 /* Warn about #pragma directives that are not recognised. */
414 int warn_unknown_pragmas = 0; /* Tri state variable. */
416 /* Warn about comparison of signed and unsigned values.
417 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
419 int warn_sign_compare = -1;
421 /* Warn about testing equality of floating point numbers. */
423 int warn_float_equal = 0;
425 /* Nonzero means warn about use of multicharacter literals. */
427 int warn_multichar = 1;
429 /* The variant of the C language being processed. */
431 c_language_kind c_language = clk_c;
433 /* Nonzero means `$' can be in an identifier. */
435 #ifndef DOLLARS_IN_IDENTIFIERS
436 #define DOLLARS_IN_IDENTIFIERS 1
438 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
440 /* Decode the string P as a language-specific option for C.
441 Return the number of strings consumed. Should not complain
442 if it does not recognise the option. */
445 c_decode_option (argc, argv)
446 int argc ATTRIBUTE_UNUSED;
449 int strings_processed;
452 strings_processed = cpp_handle_option (parse_in, argc, argv);
454 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
456 flag_traditional = 1;
457 flag_writable_strings = 1;
459 else if (!strcmp (p, "-fallow-single-precision"))
460 flag_allow_single_precision = 1;
461 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
466 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
470 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
474 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
476 flag_traditional = 0;
477 flag_writable_strings = 0;
479 else if (!strncmp (p, "-std=", 5))
481 /* Select the appropriate language standard. We currently
483 -std=iso9899:1990 same as -ansi
484 -std=iso9899:199409 ISO C as modified in amend. 1
485 -std=iso9899:1999 ISO C 99
486 -std=c89 same as -std=iso9899:1990
487 -std=c99 same as -std=iso9899:1999
488 -std=gnu89 default, iso9899:1990 + gnu extensions
489 -std=gnu99 iso9899:1999 + gnu extensions
491 const char *argstart = &p[5];
493 if (!strcmp (argstart, "iso9899:1990")
494 || !strcmp (argstart, "c89"))
499 flag_traditional = 0;
500 flag_writable_strings = 0;
502 flag_no_nonansi_builtin = 1;
503 flag_noniso_default_format_attributes = 0;
506 else if (!strcmp (argstart, "iso9899:199409"))
511 else if (!strcmp (argstart, "iso9899:199x")
512 || !strcmp (argstart, "iso9899:1999")
513 || !strcmp (argstart, "c9x")
514 || !strcmp (argstart, "c99"))
516 flag_traditional = 0;
517 flag_writable_strings = 0;
519 flag_no_nonansi_builtin = 1;
520 flag_noniso_default_format_attributes = 0;
524 else if (!strcmp (argstart, "gnu89"))
526 flag_traditional = 0;
527 flag_writable_strings = 0;
529 flag_no_nonansi_builtin = 0;
530 flag_noniso_default_format_attributes = 1;
534 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
536 flag_traditional = 0;
537 flag_writable_strings = 0;
539 flag_no_nonansi_builtin = 0;
540 flag_noniso_default_format_attributes = 1;
545 error ("unknown C standard `%s'", argstart);
547 else if (!strcmp (p, "-fdollars-in-identifiers"))
548 dollars_in_ident = 1;
549 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
550 dollars_in_ident = 0;
551 else if (!strcmp (p, "-fsigned-char"))
552 flag_signed_char = 1;
553 else if (!strcmp (p, "-funsigned-char"))
554 flag_signed_char = 0;
555 else if (!strcmp (p, "-fno-signed-char"))
556 flag_signed_char = 0;
557 else if (!strcmp (p, "-fno-unsigned-char"))
558 flag_signed_char = 1;
559 else if (!strcmp (p, "-fsigned-bitfields")
560 || !strcmp (p, "-fno-unsigned-bitfields"))
562 flag_signed_bitfields = 1;
563 explicit_flag_signed_bitfields = 1;
565 else if (!strcmp (p, "-funsigned-bitfields")
566 || !strcmp (p, "-fno-signed-bitfields"))
568 flag_signed_bitfields = 0;
569 explicit_flag_signed_bitfields = 1;
571 else if (!strcmp (p, "-fshort-enums"))
572 flag_short_enums = 1;
573 else if (!strcmp (p, "-fno-short-enums"))
574 flag_short_enums = 0;
575 else if (!strcmp (p, "-fshort-wchar"))
576 flag_short_wchar = 1;
577 else if (!strcmp (p, "-fno-short-wchar"))
578 flag_short_wchar = 0;
579 else if (!strcmp (p, "-fcond-mismatch"))
580 flag_cond_mismatch = 1;
581 else if (!strcmp (p, "-fno-cond-mismatch"))
582 flag_cond_mismatch = 0;
583 else if (!strcmp (p, "-fshort-double"))
584 flag_short_double = 1;
585 else if (!strcmp (p, "-fno-short-double"))
586 flag_short_double = 0;
587 else if (!strcmp (p, "-fasm"))
589 else if (!strcmp (p, "-fno-asm"))
591 else if (!strcmp (p, "-fbuiltin"))
593 else if (!strcmp (p, "-fno-builtin"))
595 else if (dump_switch_p (p))
597 else if (!strcmp (p, "-ansi"))
599 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
600 mesg_implicit_function_declaration = 2;
601 else if (!strcmp (p, "-Wimplicit-function-declaration"))
602 mesg_implicit_function_declaration = 1;
603 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
604 mesg_implicit_function_declaration = 0;
605 else if (!strcmp (p, "-Wimplicit-int"))
606 warn_implicit_int = 1;
607 else if (!strcmp (p, "-Wno-implicit-int"))
608 warn_implicit_int = 0;
609 else if (!strcmp (p, "-Wimplicit"))
611 warn_implicit_int = 1;
612 if (mesg_implicit_function_declaration != 2)
613 mesg_implicit_function_declaration = 1;
615 else if (!strcmp (p, "-Wno-implicit"))
616 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
617 else if (!strcmp (p, "-Wlong-long"))
619 else if (!strcmp (p, "-Wno-long-long"))
621 else if (!strcmp (p, "-Wwrite-strings"))
622 flag_const_strings = 1;
623 else if (!strcmp (p, "-Wno-write-strings"))
624 flag_const_strings = 0;
625 else if (!strcmp (p, "-Wcast-qual"))
627 else if (!strcmp (p, "-Wno-cast-qual"))
629 else if (!strcmp (p, "-Wbad-function-cast"))
630 warn_bad_function_cast = 1;
631 else if (!strcmp (p, "-Wno-bad-function-cast"))
632 warn_bad_function_cast = 0;
633 else if (!strcmp (p, "-Wno-missing-noreturn"))
634 warn_missing_noreturn = 0;
635 else if (!strcmp (p, "-Wmissing-format-attribute"))
636 warn_missing_format_attribute = 1;
637 else if (!strcmp (p, "-Wno-missing-format-attribute"))
638 warn_missing_format_attribute = 0;
639 else if (!strcmp (p, "-Wpointer-arith"))
640 warn_pointer_arith = 1;
641 else if (!strcmp (p, "-Wno-pointer-arith"))
642 warn_pointer_arith = 0;
643 else if (!strcmp (p, "-Wstrict-prototypes"))
644 warn_strict_prototypes = 1;
645 else if (!strcmp (p, "-Wno-strict-prototypes"))
646 warn_strict_prototypes = 0;
647 else if (!strcmp (p, "-Wmissing-prototypes"))
648 warn_missing_prototypes = 1;
649 else if (!strcmp (p, "-Wno-missing-prototypes"))
650 warn_missing_prototypes = 0;
651 else if (!strcmp (p, "-Wmissing-declarations"))
652 warn_missing_declarations = 1;
653 else if (!strcmp (p, "-Wno-missing-declarations"))
654 warn_missing_declarations = 0;
655 else if (!strcmp (p, "-Wredundant-decls"))
656 warn_redundant_decls = 1;
657 else if (!strcmp (p, "-Wno-redundant-decls"))
658 warn_redundant_decls = 0;
659 else if (!strcmp (p, "-Wnested-externs"))
660 warn_nested_externs = 1;
661 else if (!strcmp (p, "-Wno-nested-externs"))
662 warn_nested_externs = 0;
663 else if (!strcmp (p, "-Wtraditional"))
664 warn_traditional = 1;
665 else if (!strcmp (p, "-Wno-traditional"))
666 warn_traditional = 0;
667 else if (!strncmp (p, "-Wformat=", 9))
668 set_Wformat (atoi (p + 9));
669 else if (!strcmp (p, "-Wformat"))
671 else if (!strcmp (p, "-Wno-format"))
673 else if (!strcmp (p, "-Wformat-y2k"))
675 else if (!strcmp (p, "-Wno-format-y2k"))
677 else if (!strcmp (p, "-Wformat-extra-args"))
678 warn_format_extra_args = 1;
679 else if (!strcmp (p, "-Wno-format-extra-args"))
680 warn_format_extra_args = 0;
681 else if (!strcmp (p, "-Wformat-nonliteral"))
682 warn_format_nonliteral = 1;
683 else if (!strcmp (p, "-Wno-format-nonliteral"))
684 warn_format_nonliteral = 0;
685 else if (!strcmp (p, "-Wformat-security"))
686 warn_format_security = 1;
687 else if (!strcmp (p, "-Wno-format-security"))
688 warn_format_security = 0;
689 else if (!strcmp (p, "-Wchar-subscripts"))
690 warn_char_subscripts = 1;
691 else if (!strcmp (p, "-Wno-char-subscripts"))
692 warn_char_subscripts = 0;
693 else if (!strcmp (p, "-Wconversion"))
695 else if (!strcmp (p, "-Wno-conversion"))
697 else if (!strcmp (p, "-Wparentheses"))
698 warn_parentheses = 1;
699 else if (!strcmp (p, "-Wno-parentheses"))
700 warn_parentheses = 0;
701 else if (!strcmp (p, "-Wreturn-type"))
702 warn_return_type = 1;
703 else if (!strcmp (p, "-Wno-return-type"))
704 warn_return_type = 0;
705 else if (!strcmp (p, "-Wsequence-point"))
706 warn_sequence_point = 1;
707 else if (!strcmp (p, "-Wno-sequence-point"))
708 warn_sequence_point = 0;
709 else if (!strcmp (p, "-Wcomment"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p, "-Wno-comment"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wcomments"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wno-comments"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wtrigraphs"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wno-trigraphs"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wundef"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p, "-Wno-undef"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p, "-Wimport"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p, "-Wno-import"))
728 ; /* cpp handles this one. */
729 else if (!strcmp (p, "-Wmissing-braces"))
730 warn_missing_braces = 1;
731 else if (!strcmp (p, "-Wno-missing-braces"))
732 warn_missing_braces = 0;
733 else if (!strcmp (p, "-Wmain"))
735 else if (!strcmp (p, "-Wno-main"))
737 else if (!strcmp (p, "-Wsign-compare"))
738 warn_sign_compare = 1;
739 else if (!strcmp (p, "-Wno-sign-compare"))
740 warn_sign_compare = 0;
741 else if (!strcmp (p, "-Wfloat-equal"))
742 warn_float_equal = 1;
743 else if (!strcmp (p, "-Wno-float-equal"))
744 warn_float_equal = 0;
745 else if (!strcmp (p, "-Wmultichar"))
747 else if (!strcmp (p, "-Wno-multichar"))
749 else if (!strcmp (p, "-Wunknown-pragmas"))
750 /* Set to greater than 1, so that even unknown pragmas in system
751 headers will be warned about. */
752 warn_unknown_pragmas = 2;
753 else if (!strcmp (p, "-Wno-unknown-pragmas"))
754 warn_unknown_pragmas = 0;
755 else if (!strcmp (p, "-Wall"))
757 /* We save the value of warn_uninitialized, since if they put
758 -Wuninitialized on the command line, we need to generate a
759 warning about not using it without also specifying -O. */
760 if (warn_uninitialized != 1)
761 warn_uninitialized = 2;
762 warn_implicit_int = 1;
763 mesg_implicit_function_declaration = 1;
764 warn_return_type = 1;
768 warn_char_subscripts = 1;
769 warn_parentheses = 1;
770 warn_sequence_point = 1;
771 warn_missing_braces = 1;
772 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
773 it off only if it's not explicit. */
775 /* Only warn about unknown pragmas that are not in system headers. */
776 warn_unknown_pragmas = 1;
779 return strings_processed;
784 /* Hooks for print_node. */
787 print_lang_decl (file, node, indent)
788 FILE *file ATTRIBUTE_UNUSED;
789 tree node ATTRIBUTE_UNUSED;
790 int indent ATTRIBUTE_UNUSED;
795 print_lang_type (file, node, indent)
796 FILE *file ATTRIBUTE_UNUSED;
797 tree node ATTRIBUTE_UNUSED;
798 int indent ATTRIBUTE_UNUSED;
803 print_lang_identifier (file, node, indent)
808 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
809 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
810 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
811 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
812 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
813 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
814 if (C_IS_RESERVED_WORD (node))
816 tree rid = ridpointers[C_RID_CODE (node)];
817 indent_to (file, indent + 4);
818 fprintf (file, "rid ");
819 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
820 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
824 /* Hook called at end of compilation to assume 1 elt
825 for a top-level tentative array defn that wasn't complete before. */
828 finish_incomplete_decl (decl)
831 if (TREE_CODE (decl) == VAR_DECL)
833 tree type = TREE_TYPE (decl);
834 if (type != error_mark_node
835 && TREE_CODE (type) == ARRAY_TYPE
836 && ! DECL_EXTERNAL (decl)
837 && TYPE_DOMAIN (type) == 0)
839 warning_with_decl (decl, "array `%s' assumed to have one element");
841 complete_array_type (type, NULL_TREE, 1);
843 layout_decl (decl, 0);
848 /* Create a new `struct binding_level'. */
850 static struct binding_level *
851 make_binding_level ()
854 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
857 /* Nonzero if we are currently in the global binding level. */
862 return current_binding_level == global_binding_level;
868 keep_next_level_flag = 1;
871 /* Nonzero if the current level needs to have a BLOCK made. */
876 return ((current_binding_level->keep_if_subblocks
877 && current_binding_level->blocks != 0)
878 || current_binding_level->keep
879 || current_binding_level->names != 0
880 || (current_binding_level->tags != 0
881 && !current_binding_level->tag_transparent));
884 /* Identify this binding level as a level of parameters.
885 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
886 But it turns out there is no way to pass the right value for
887 DEFINITION_FLAG, so we ignore it. */
890 declare_parm_level (definition_flag)
891 int definition_flag ATTRIBUTE_UNUSED;
893 current_binding_level->parm_flag = 1;
896 /* Nonzero if currently making parm declarations. */
901 return current_binding_level->parm_flag;
904 /* Enter a new binding level.
905 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
906 not for that of tags. */
909 pushlevel (tag_transparent)
912 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
914 /* If this is the top level of a function,
915 just make sure that NAMED_LABELS is 0. */
917 if (current_binding_level == global_binding_level)
922 /* Reuse or create a struct for this binding level. */
924 if (free_binding_level)
926 newlevel = free_binding_level;
927 free_binding_level = free_binding_level->level_chain;
931 newlevel = make_binding_level ();
934 /* Add this level to the front of the chain (stack) of levels that
937 *newlevel = clear_binding_level;
938 newlevel->tag_transparent
940 || (current_binding_level
941 ? current_binding_level->subblocks_tag_transparent
943 newlevel->level_chain = current_binding_level;
944 current_binding_level = newlevel;
945 newlevel->keep = keep_next_level_flag;
946 keep_next_level_flag = 0;
947 newlevel->keep_if_subblocks = keep_next_if_subblocks;
948 keep_next_if_subblocks = 0;
951 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
954 clear_limbo_values (block)
959 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
960 if (DECL_NAME (tem) != 0)
961 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
963 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
964 clear_limbo_values (tem);
967 /* Exit a binding level.
968 Pop the level off, and restore the state of the identifier-decl mappings
969 that were in effect when this level was entered.
971 If KEEP is nonzero, this level had explicit declarations, so
972 and create a "block" (a BLOCK node) for the level
973 to record its declarations and subblocks for symbol table output.
975 If FUNCTIONBODY is nonzero, this level is the body of a function,
976 so create a block as if KEEP were set and also clear out all
979 If REVERSE is nonzero, reverse the order of decls before putting
980 them into the BLOCK. */
983 poplevel (keep, reverse, functionbody)
989 /* The chain of decls was accumulated in reverse order.
990 Put it into forward order, just for cleanliness. */
992 tree tags = current_binding_level->tags;
993 tree subblocks = current_binding_level->blocks;
996 int block_previously_created;
998 keep |= current_binding_level->keep;
1000 /* This warning is turned off because it causes warnings for
1001 declarations like `extern struct foo *x'. */
1003 /* Warn about incomplete structure types in this level. */
1004 for (link = tags; link; link = TREE_CHAIN (link))
1005 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1007 tree type = TREE_VALUE (link);
1008 tree type_name = TYPE_NAME (type);
1009 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1011 : DECL_NAME (type_name));
1012 switch (TREE_CODE (type))
1015 error ("`struct %s' incomplete in scope ending here", id);
1018 error ("`union %s' incomplete in scope ending here", id);
1021 error ("`enum %s' incomplete in scope ending here", id);
1027 /* Get the decls in the order they were written.
1028 Usually current_binding_level->names is in reverse order.
1029 But parameter decls were previously put in forward order. */
1032 current_binding_level->names
1033 = decls = nreverse (current_binding_level->names);
1035 decls = current_binding_level->names;
1037 /* Output any nested inline functions within this block
1038 if they weren't already output. */
1040 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1041 if (TREE_CODE (decl) == FUNCTION_DECL
1042 && ! TREE_ASM_WRITTEN (decl)
1043 && DECL_INITIAL (decl) != 0
1044 && TREE_ADDRESSABLE (decl))
1046 /* If this decl was copied from a file-scope decl
1047 on account of a block-scope extern decl,
1048 propagate TREE_ADDRESSABLE to the file-scope decl.
1050 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1051 true, since then the decl goes through save_for_inline_copying. */
1052 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1053 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1054 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1057 /* We used to warn about unused variables in expand_end_bindings,
1058 i.e. while generating RTL. But in function-at-a-time mode we may
1059 choose to never expand a function at all (e.g. auto inlining), so
1060 we do this explicitly now. */
1061 warn_about_unused_variables (getdecls ());
1063 /* If there were any declarations or structure tags in that level,
1064 or if this level is a function body,
1065 create a BLOCK to record them for the life of this function. */
1068 block_previously_created = (current_binding_level->this_block != 0);
1069 if (block_previously_created)
1070 block = current_binding_level->this_block;
1071 else if (keep || functionbody
1072 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1073 block = make_node (BLOCK);
1076 BLOCK_VARS (block) = decls;
1077 BLOCK_SUBBLOCKS (block) = subblocks;
1080 /* In each subblock, record that this is its superior. */
1082 for (link = subblocks; link; link = TREE_CHAIN (link))
1083 BLOCK_SUPERCONTEXT (link) = block;
1085 /* Clear out the meanings of the local variables of this level. */
1087 for (link = decls; link; link = TREE_CHAIN (link))
1089 if (DECL_NAME (link) != 0)
1091 /* If the ident. was used or addressed via a local extern decl,
1092 don't forget that fact. */
1093 if (DECL_EXTERNAL (link))
1095 if (TREE_USED (link))
1096 TREE_USED (DECL_NAME (link)) = 1;
1097 if (TREE_ADDRESSABLE (link))
1098 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1100 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1104 /* Restore all name-meanings of the outer levels
1105 that were shadowed by this level. */
1107 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1108 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1110 /* If the level being exited is the top level of a function,
1111 check over all the labels, and clear out the current
1112 (function local) meanings of their names. */
1116 clear_limbo_values (block);
1118 /* If this is the top level block of a function,
1119 the vars are the function's parameters.
1120 Don't leave them in the BLOCK because they are
1121 found in the FUNCTION_DECL instead. */
1123 BLOCK_VARS (block) = 0;
1125 /* Clear out the definitions of all label names,
1126 since their scopes end here,
1127 and add them to BLOCK_VARS. */
1129 for (link = named_labels; link; link = TREE_CHAIN (link))
1131 register tree label = TREE_VALUE (link);
1133 if (DECL_INITIAL (label) == 0)
1135 error_with_decl (label, "label `%s' used but not defined");
1136 /* Avoid crashing later. */
1137 define_label (input_filename, lineno,
1140 else if (warn_unused_label && !TREE_USED (label))
1141 warning_with_decl (label, "label `%s' defined but not used");
1142 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1144 /* Put the labels into the "variables" of the
1145 top-level block, so debugger can see them. */
1146 TREE_CHAIN (label) = BLOCK_VARS (block);
1147 BLOCK_VARS (block) = label;
1151 /* Pop the current level, and free the structure for reuse. */
1154 register struct binding_level *level = current_binding_level;
1155 current_binding_level = current_binding_level->level_chain;
1157 level->level_chain = free_binding_level;
1158 free_binding_level = level;
1161 /* Dispose of the block that we just made inside some higher level. */
1163 DECL_INITIAL (current_function_decl) = block;
1166 if (!block_previously_created)
1167 current_binding_level->blocks
1168 = chainon (current_binding_level->blocks, block);
1170 /* If we did not make a block for the level just exited,
1171 any blocks made for inner levels
1172 (since they cannot be recorded as subblocks in that level)
1173 must be carried forward so they will later become subblocks
1174 of something else. */
1176 current_binding_level->blocks
1177 = chainon (current_binding_level->blocks, subblocks);
1179 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1180 binding contour so that they point to the appropriate construct, i.e.
1181 either to the current FUNCTION_DECL node, or else to the BLOCK node
1182 we just constructed.
1184 Note that for tagged types whose scope is just the formal parameter
1185 list for some function type specification, we can't properly set
1186 their TYPE_CONTEXTs here, because we don't have a pointer to the
1187 appropriate FUNCTION_TYPE node readily available to us. For those
1188 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1189 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1190 node which will represent the "scope" for these "parameter list local"
1194 for (link = tags; link; link = TREE_CHAIN (link))
1195 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1197 for (link = tags; link; link = TREE_CHAIN (link))
1198 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1201 TREE_USED (block) = 1;
1206 /* Delete the node BLOCK from the current binding level.
1207 This is used for the block inside a stmt expr ({...})
1208 so that the block can be reinserted where appropriate. */
1211 delete_block (block)
1215 if (current_binding_level->blocks == block)
1216 current_binding_level->blocks = TREE_CHAIN (block);
1217 for (t = current_binding_level->blocks; t;)
1219 if (TREE_CHAIN (t) == block)
1220 TREE_CHAIN (t) = TREE_CHAIN (block);
1224 TREE_CHAIN (block) = NULL;
1225 /* Clear TREE_USED which is always set by poplevel.
1226 The flag is set again if insert_block is called. */
1227 TREE_USED (block) = 0;
1230 /* Insert BLOCK at the end of the list of subblocks of the
1231 current binding level. This is used when a BIND_EXPR is expanded,
1232 to handle the BLOCK node inside the BIND_EXPR. */
1235 insert_block (block)
1238 TREE_USED (block) = 1;
1239 current_binding_level->blocks
1240 = chainon (current_binding_level->blocks, block);
1243 /* Set the BLOCK node for the innermost scope
1244 (the one we are currently in). */
1248 register tree block;
1250 current_binding_level->this_block = block;
1251 current_binding_level->names = chainon (current_binding_level->names,
1252 BLOCK_VARS (block));
1253 current_binding_level->blocks = chainon (current_binding_level->blocks,
1254 BLOCK_SUBBLOCKS (block));
1260 register struct binding_level *newlevel;
1262 /* Reuse or create a struct for this binding level. */
1264 if (free_binding_level)
1266 newlevel = free_binding_level;
1267 free_binding_level = free_binding_level->level_chain;
1271 newlevel = make_binding_level ();
1274 /* Add this level to the front of the chain (stack) of label levels. */
1276 newlevel->level_chain = label_level_chain;
1277 label_level_chain = newlevel;
1279 newlevel->names = named_labels;
1280 newlevel->shadowed = shadowed_labels;
1282 shadowed_labels = 0;
1288 register struct binding_level *level = label_level_chain;
1291 /* Clear out the definitions of the declared labels in this level.
1292 Leave in the list any ordinary, non-declared labels. */
1293 for (link = named_labels, prev = 0; link;)
1295 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1297 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1299 error_with_decl (TREE_VALUE (link),
1300 "label `%s' used but not defined");
1301 /* Avoid crashing later. */
1302 define_label (input_filename, lineno,
1303 DECL_NAME (TREE_VALUE (link)));
1305 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1306 warning_with_decl (TREE_VALUE (link),
1307 "label `%s' defined but not used");
1308 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1310 /* Delete this element from the list. */
1311 link = TREE_CHAIN (link);
1313 TREE_CHAIN (prev) = link;
1315 named_labels = link;
1320 link = TREE_CHAIN (link);
1324 /* Bring back all the labels that were shadowed. */
1325 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1326 if (DECL_NAME (TREE_VALUE (link)) != 0)
1327 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1328 = TREE_VALUE (link);
1330 named_labels = chainon (named_labels, level->names);
1331 shadowed_labels = level->shadowed;
1333 /* Pop the current level, and free the structure for reuse. */
1334 label_level_chain = label_level_chain->level_chain;
1335 level->level_chain = free_binding_level;
1336 free_binding_level = level;
1339 /* Push a definition or a declaration of struct, union or enum tag "name".
1340 "type" should be the type node.
1341 We assume that the tag "name" is not already defined.
1343 Note that the definition may really be just a forward reference.
1344 In that case, the TYPE_SIZE will be zero. */
1347 pushtag (name, type)
1350 register struct binding_level *b;
1352 /* Find the proper binding level for this type tag. */
1354 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1359 /* Record the identifier as the type's name if it has none. */
1361 if (TYPE_NAME (type) == 0)
1362 TYPE_NAME (type) = name;
1365 b->tags = tree_cons (name, type, b->tags);
1367 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1368 tagged type we just added to the current binding level. This fake
1369 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1370 to output a representation of a tagged type, and it also gives
1371 us a convenient place to record the "scope start" address for the
1374 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1376 /* An approximation for now, so we can tell this is a function-scope tag.
1377 This will be updated in poplevel. */
1378 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1381 /* Handle when a new declaration NEWDECL
1382 has the same name as an old one OLDDECL
1383 in the same binding contour.
1384 Prints an error message if appropriate.
1386 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1387 Otherwise, return 0.
1389 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1390 and OLDDECL is in an outer binding level and should thus not be changed. */
1393 duplicate_decls (newdecl, olddecl, different_binding_level)
1394 register tree newdecl, olddecl;
1395 int different_binding_level;
1397 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1398 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1399 && DECL_INITIAL (newdecl) != 0);
1400 tree oldtype = TREE_TYPE (olddecl);
1401 tree newtype = TREE_TYPE (newdecl);
1404 if (DECL_P (olddecl))
1405 DECL_MACHINE_ATTRIBUTES (newdecl)
1406 = merge_machine_decl_attributes (olddecl, newdecl);
1408 if (TREE_CODE (newtype) == ERROR_MARK
1409 || TREE_CODE (oldtype) == ERROR_MARK)
1412 /* New decl is completely inconsistent with the old one =>
1413 tell caller to replace the old one.
1414 This is always an error except in the case of shadowing a builtin. */
1415 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1417 if (TREE_CODE (olddecl) == FUNCTION_DECL
1418 && (DECL_BUILT_IN (olddecl)
1419 || DECL_BUILT_IN_NONANSI (olddecl)))
1421 /* If you declare a built-in or predefined function name as static,
1422 the old definition is overridden,
1423 but optionally warn this was a bad choice of name. */
1424 if (!TREE_PUBLIC (newdecl))
1428 else if (DECL_BUILT_IN (olddecl))
1429 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1431 warning_with_decl (newdecl, "shadowing library function `%s'");
1433 /* Likewise, if the built-in is not ansi, then programs can
1434 override it even globally without an error. */
1435 else if (! DECL_BUILT_IN (olddecl))
1436 warning_with_decl (newdecl,
1437 "library function `%s' declared as non-function");
1439 else if (DECL_BUILT_IN_NONANSI (olddecl))
1440 warning_with_decl (newdecl,
1441 "built-in function `%s' declared as non-function");
1443 warning_with_decl (newdecl,
1444 "built-in function `%s' declared as non-function");
1448 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1449 error_with_decl (olddecl, "previous declaration of `%s'");
1455 /* For real parm decl following a forward decl,
1456 return 1 so old decl will be reused. */
1457 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1458 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1461 /* The new declaration is the same kind of object as the old one.
1462 The declarations may partially match. Print warnings if they don't
1463 match enough. Ultimately, copy most of the information from the new
1464 decl to the old one, and keep using the old one. */
1466 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1467 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1468 && DECL_INITIAL (olddecl) == 0)
1469 /* If -traditional, avoid error for redeclaring fcn
1470 after implicit decl. */
1472 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1473 && DECL_BUILT_IN (olddecl))
1475 /* A function declaration for a built-in function. */
1476 if (!TREE_PUBLIC (newdecl))
1478 /* If you declare a built-in function name as static, the
1479 built-in definition is overridden,
1480 but optionally warn this was a bad choice of name. */
1482 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1483 /* Discard the old built-in function. */
1486 else if (!types_match)
1488 /* Accept the return type of the new declaration if same modes. */
1489 tree oldreturntype = TREE_TYPE (oldtype);
1490 tree newreturntype = TREE_TYPE (newtype);
1492 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1494 /* Function types may be shared, so we can't just modify
1495 the return type of olddecl's function type. */
1497 = build_function_type (newreturntype,
1498 TYPE_ARG_TYPES (oldtype));
1500 types_match = comptypes (newtype, trytype);
1504 /* Accept harmless mismatch in first argument type also.
1505 This is for the ffs and fprintf builtins. */
1506 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1507 && TYPE_ARG_TYPES (oldtype) != 0
1508 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1509 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1510 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1511 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1513 /* Function types may be shared, so we can't just modify
1514 the return type of olddecl's function type. */
1516 = build_function_type (TREE_TYPE (oldtype),
1517 tree_cons (NULL_TREE,
1518 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1519 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1521 types_match = comptypes (newtype, trytype);
1525 if (! different_binding_level)
1526 TREE_TYPE (olddecl) = oldtype;
1530 /* If types don't match for a built-in, throw away the built-in. */
1531 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1535 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1536 && DECL_SOURCE_LINE (olddecl) == 0)
1538 /* A function declaration for a predeclared function
1539 that isn't actually built in. */
1540 if (!TREE_PUBLIC (newdecl))
1542 /* If you declare it as static, the
1543 default definition is overridden. */
1546 else if (!types_match)
1548 /* If the types don't match, preserve volatility indication.
1549 Later on, we will discard everything else about the
1550 default declaration. */
1551 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1554 /* Permit char *foo () to match void *foo (...) if not pedantic,
1555 if one of them came from a system header file. */
1556 else if (!types_match
1557 && TREE_CODE (olddecl) == FUNCTION_DECL
1558 && TREE_CODE (newdecl) == FUNCTION_DECL
1559 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1560 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1561 && (DECL_IN_SYSTEM_HEADER (olddecl)
1562 || DECL_IN_SYSTEM_HEADER (newdecl))
1563 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1564 && TYPE_ARG_TYPES (oldtype) == 0
1565 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1566 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1568 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1569 && TYPE_ARG_TYPES (newtype) == 0
1570 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1571 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1574 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1575 /* Make sure we keep void * as ret type, not char *. */
1576 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1577 TREE_TYPE (newdecl) = newtype = oldtype;
1579 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1580 we will come back here again. */
1581 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1583 else if (!types_match
1584 /* Permit char *foo (int, ...); followed by char *foo ();
1586 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1588 /* Return types must still match. */
1589 && comptypes (TREE_TYPE (oldtype),
1590 TREE_TYPE (newtype))
1591 && TYPE_ARG_TYPES (newtype) == 0))
1593 error_with_decl (newdecl, "conflicting types for `%s'");
1594 /* Check for function type mismatch
1595 involving an empty arglist vs a nonempty one. */
1596 if (TREE_CODE (olddecl) == FUNCTION_DECL
1597 && comptypes (TREE_TYPE (oldtype),
1598 TREE_TYPE (newtype))
1599 && ((TYPE_ARG_TYPES (oldtype) == 0
1600 && DECL_INITIAL (olddecl) == 0)
1602 (TYPE_ARG_TYPES (newtype) == 0
1603 && DECL_INITIAL (newdecl) == 0)))
1605 /* Classify the problem further. */
1606 register tree t = TYPE_ARG_TYPES (oldtype);
1608 t = TYPE_ARG_TYPES (newtype);
1609 for (; t; t = TREE_CHAIN (t))
1611 register tree type = TREE_VALUE (t);
1613 if (TREE_CHAIN (t) == 0
1614 && TYPE_MAIN_VARIANT (type) != void_type_node)
1616 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1620 if (simple_type_promotes_to (type) != NULL_TREE)
1622 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1627 error_with_decl (olddecl, "previous declaration of `%s'");
1631 errmsg = redeclaration_error_message (newdecl, olddecl);
1637 error_with_decl (newdecl, "redefinition of `%s'");
1640 error_with_decl (newdecl, "redeclaration of `%s'");
1643 error_with_decl (newdecl, "conflicting declarations of `%s'");
1649 error_with_decl (olddecl,
1650 ((DECL_INITIAL (olddecl)
1651 && current_binding_level == global_binding_level)
1652 ? "`%s' previously defined here"
1653 : "`%s' previously declared here"));
1655 else if (TREE_CODE (newdecl) == TYPE_DECL
1656 && (DECL_IN_SYSTEM_HEADER (olddecl)
1657 || DECL_IN_SYSTEM_HEADER (newdecl)))
1659 warning_with_decl (newdecl, "redefinition of `%s'");
1662 ((DECL_INITIAL (olddecl)
1663 && current_binding_level == global_binding_level)
1664 ? "`%s' previously defined here"
1665 : "`%s' previously declared here"));
1667 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1668 && DECL_INITIAL (olddecl) != 0
1669 && TYPE_ARG_TYPES (oldtype) == 0
1670 && TYPE_ARG_TYPES (newtype) != 0
1671 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1673 register tree type, parm;
1675 /* Prototype decl follows defn w/o prototype. */
1677 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1678 type = TYPE_ARG_TYPES (newtype),
1681 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1683 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1684 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1686 warning_with_decl (newdecl, "prototype for `%s' follows");
1687 warning_with_decl (olddecl, "non-prototype definition here");
1690 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1691 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1693 error_with_decl (newdecl,
1694 "prototype for `%s' follows and number of arguments doesn't match");
1695 error_with_decl (olddecl, "non-prototype definition here");
1699 /* Type for passing arg must be consistent
1700 with that declared for the arg. */
1701 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1702 /* If -traditional, allow `unsigned int' instead of `int'
1703 in the prototype. */
1704 && (! (flag_traditional
1705 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1706 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1708 error_with_decl (newdecl,
1709 "prototype for `%s' follows and argument %d doesn't match",
1711 error_with_decl (olddecl, "non-prototype definition here");
1717 /* Warn about mismatches in various flags. */
1720 /* Warn if function is now inline
1721 but was previously declared not inline and has been called. */
1722 if (TREE_CODE (olddecl) == FUNCTION_DECL
1723 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1724 && TREE_USED (olddecl))
1725 warning_with_decl (newdecl,
1726 "`%s' declared inline after being called");
1727 if (TREE_CODE (olddecl) == FUNCTION_DECL
1728 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1729 && DECL_INITIAL (olddecl) != 0)
1730 warning_with_decl (newdecl,
1731 "`%s' declared inline after its definition");
1733 /* If pedantic, warn when static declaration follows a non-static
1734 declaration. Otherwise, do so only for functions. */
1735 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1736 && TREE_PUBLIC (olddecl)
1737 && !TREE_PUBLIC (newdecl))
1738 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1740 /* If warn_traditional, warn when a non-static function
1741 declaration follows a static one. */
1742 if (warn_traditional && !in_system_header
1743 && TREE_CODE (olddecl) == FUNCTION_DECL
1744 && !TREE_PUBLIC (olddecl)
1745 && TREE_PUBLIC (newdecl))
1746 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1748 /* Warn when const declaration follows a non-const
1749 declaration, but not for functions. */
1750 if (TREE_CODE (olddecl) != FUNCTION_DECL
1751 && !TREE_READONLY (olddecl)
1752 && TREE_READONLY (newdecl))
1753 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1754 /* These bits are logically part of the type, for variables.
1755 But not for functions
1756 (where qualifiers are not valid ANSI anyway). */
1757 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1758 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1759 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1760 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1764 /* Optionally warn about more than one declaration for the same name. */
1765 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1766 /* Don't warn about a function declaration
1767 followed by a definition. */
1768 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1769 && DECL_INITIAL (olddecl) == 0)
1770 /* Don't warn about extern decl followed by (tentative) definition. */
1771 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1773 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1774 warning_with_decl (olddecl, "previous declaration of `%s'");
1777 /* Copy all the DECL_... slots specified in the new decl
1778 except for any that we copy here from the old type.
1780 Past this point, we don't change OLDTYPE and NEWTYPE
1781 even if we change the types of NEWDECL and OLDDECL. */
1785 /* When copying info to olddecl, we store into write_olddecl
1786 instead. This allows us to avoid modifying olddecl when
1787 different_binding_level is true. */
1788 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1790 /* Merge the data types specified in the two decls. */
1791 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1793 if (different_binding_level)
1795 if (TYPE_ARG_TYPES (oldtype) != 0
1796 && TYPE_ARG_TYPES (newtype) == 0)
1797 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1800 = build_type_attribute_variant
1802 merge_attributes (TYPE_ATTRIBUTES (newtype),
1803 TYPE_ATTRIBUTES (oldtype)));
1807 = TREE_TYPE (olddecl)
1808 = common_type (newtype, oldtype);
1811 /* Lay the type out, unless already done. */
1812 if (oldtype != TREE_TYPE (newdecl))
1814 if (TREE_TYPE (newdecl) != error_mark_node)
1815 layout_type (TREE_TYPE (newdecl));
1816 if (TREE_CODE (newdecl) != FUNCTION_DECL
1817 && TREE_CODE (newdecl) != TYPE_DECL
1818 && TREE_CODE (newdecl) != CONST_DECL)
1819 layout_decl (newdecl, 0);
1823 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1824 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1825 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1826 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1827 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1828 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1830 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1831 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1835 /* Keep the old rtl since we can safely use it. */
1836 COPY_DECL_RTL (olddecl, newdecl);
1838 /* Merge the type qualifiers. */
1839 if (TREE_CODE (olddecl) == FUNCTION_DECL
1840 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1841 && ! TREE_THIS_VOLATILE (newdecl))
1842 TREE_THIS_VOLATILE (write_olddecl) = 0;
1844 if (TREE_READONLY (newdecl))
1845 TREE_READONLY (write_olddecl) = 1;
1847 if (TREE_THIS_VOLATILE (newdecl))
1849 TREE_THIS_VOLATILE (write_olddecl) = 1;
1850 if (TREE_CODE (newdecl) == VAR_DECL
1851 /* If an automatic variable is re-declared in the same
1852 function scope, but the old declaration was not
1853 volatile, make_var_volatile() would crash because the
1854 variable would have been assigned to a pseudo, not a
1855 MEM. Since this duplicate declaration is invalid
1856 anyway, we just skip the call. */
1858 make_var_volatile (newdecl);
1861 /* Keep source location of definition rather than declaration. */
1862 /* When called with different_binding_level set, keep the old
1863 information so that meaningful diagnostics can be given. */
1864 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1865 && ! different_binding_level)
1867 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1868 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1871 /* Merge the unused-warning information. */
1872 if (DECL_IN_SYSTEM_HEADER (olddecl))
1873 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1874 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1875 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1877 /* Merge the initialization information. */
1878 /* When called with different_binding_level set, don't copy over
1879 DECL_INITIAL, so that we don't accidentally change function
1880 declarations into function definitions. */
1881 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1882 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1884 /* Merge the section attribute.
1885 We want to issue an error if the sections conflict but that must be
1886 done later in decl_attributes since we are called before attributes
1888 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1889 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1891 /* Copy the assembler name.
1892 Currently, it can only be defined in the prototype. */
1893 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1898 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1900 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1901 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1902 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1903 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1904 DECL_NO_LIMIT_STACK (newdecl)
1905 |= DECL_NO_LIMIT_STACK (olddecl);
1908 /* If cannot merge, then use the new type and qualifiers,
1909 and don't preserve the old rtl. */
1910 else if (! different_binding_level)
1912 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1913 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1914 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1915 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1918 /* Merge the storage class information. */
1919 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1920 /* For functions, static overrides non-static. */
1921 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1923 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1924 /* This is since we don't automatically
1925 copy the attributes of NEWDECL into OLDDECL. */
1926 /* No need to worry about different_binding_level here because
1927 then TREE_PUBLIC (newdecl) was true. */
1928 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1929 /* If this clears `static', clear it in the identifier too. */
1930 if (! TREE_PUBLIC (olddecl))
1931 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1933 if (DECL_EXTERNAL (newdecl))
1935 if (! different_binding_level)
1937 /* Don't mess with these flags on local externs; they remain
1938 external even if there's a declaration at file scope which
1940 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1941 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1943 /* An extern decl does not override previous storage class. */
1944 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1945 if (! DECL_EXTERNAL (newdecl))
1946 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1950 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1951 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1954 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1956 /* If we're redefining a function previously defined as extern
1957 inline, make sure we emit debug info for the inline before we
1958 throw it away, in case it was inlined into a function that hasn't
1959 been written out yet. */
1960 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1962 note_outlining_of_inline_function (olddecl);
1964 /* The new defn must not be inline. */
1965 DECL_INLINE (newdecl) = 0;
1966 DECL_UNINLINABLE (newdecl) = 1;
1970 /* If either decl says `inline', this fn is inline,
1971 unless its definition was passed already. */
1972 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1973 DECL_INLINE (olddecl) = 1;
1975 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1978 if (DECL_BUILT_IN (olddecl))
1980 /* Get rid of any built-in function if new arg types don't match it
1981 or if we have a function definition. */
1982 if (! types_match || new_is_definition)
1984 if (! different_binding_level)
1986 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1987 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1992 /* If redeclaring a builtin function, and not a definition,
1993 it stays built in. */
1994 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1995 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1998 /* Also preserve various other info from the definition. */
1999 else if (! new_is_definition)
2000 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2001 if (! new_is_definition)
2003 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2004 /* When called with different_binding_level set, don't copy over
2005 DECL_INITIAL, so that we don't accidentally change function
2006 declarations into function definitions. */
2007 if (! different_binding_level)
2008 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2009 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2010 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2011 if (DECL_INLINE (newdecl))
2012 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2015 if (different_binding_level)
2018 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2019 But preserve OLDDECL's DECL_UID. */
2021 register unsigned olddecl_uid = DECL_UID (olddecl);
2023 memcpy ((char *) olddecl + sizeof (struct tree_common),
2024 (char *) newdecl + sizeof (struct tree_common),
2025 sizeof (struct tree_decl) - sizeof (struct tree_common));
2026 DECL_UID (olddecl) = olddecl_uid;
2029 /* NEWDECL contains the merged attribute lists.
2030 Update OLDDECL to be the same. */
2031 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2036 /* Record a decl-node X as belonging to the current lexical scope.
2037 Check for errors (such as an incompatible declaration for the same
2038 name already seen in the same scope).
2040 Returns either X or an old decl for the same name.
2041 If an old decl is returned, it may have been smashed
2042 to agree with what X says. */
2049 register tree name = DECL_NAME (x);
2050 register struct binding_level *b = current_binding_level;
2052 DECL_CONTEXT (x) = current_function_decl;
2053 /* A local extern declaration for a function doesn't constitute nesting.
2054 A local auto declaration does, since it's a forward decl
2055 for a nested function coming later. */
2056 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2057 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2058 DECL_CONTEXT (x) = 0;
2060 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2061 && x != IDENTIFIER_IMPLICIT_DECL (name)
2062 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2063 && !DECL_IN_SYSTEM_HEADER (x))
2064 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2070 int different_binding_level = 0;
2072 t = lookup_name_current_level (name);
2073 /* Don't type check externs here when -traditional. This is so that
2074 code with conflicting declarations inside blocks will get warnings
2075 not errors. X11 for instance depends on this. */
2076 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2078 t = IDENTIFIER_GLOBAL_VALUE (name);
2079 /* Type decls at global scope don't conflict with externs declared
2080 inside lexical blocks. */
2081 if (t && TREE_CODE (t) == TYPE_DECL)
2083 different_binding_level = 1;
2085 if (t != 0 && t == error_mark_node)
2086 /* error_mark_node is 0 for a while during initialization! */
2089 error_with_decl (x, "`%s' used prior to declaration");
2094 file = DECL_SOURCE_FILE (t);
2095 line = DECL_SOURCE_LINE (t);
2098 /* If this decl is `static' and an implicit decl was seen previously,
2099 warn. But don't complain if -traditional,
2100 since traditional compilers don't complain. */
2101 if (! flag_traditional && TREE_PUBLIC (name)
2102 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2103 sets this for all functions. */
2104 && ! TREE_PUBLIC (x)
2105 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2106 /* We used to warn also for explicit extern followed by static,
2107 but sometimes you need to do it that way. */
2108 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2110 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2111 IDENTIFIER_POINTER (name));
2112 pedwarn_with_file_and_line
2113 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2114 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2115 "previous declaration of `%s'",
2116 IDENTIFIER_POINTER (name));
2117 TREE_THIS_VOLATILE (name) = 1;
2120 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2122 if (TREE_CODE (t) == PARM_DECL)
2124 /* Don't allow more than one "real" duplicate
2125 of a forward parm decl. */
2126 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2132 /* If we are processing a typedef statement, generate a whole new
2133 ..._TYPE node (which will be just an variant of the existing
2134 ..._TYPE node with identical properties) and then install the
2135 TYPE_DECL node generated to represent the typedef name as the
2136 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2138 The whole point here is to end up with a situation where each
2139 and every ..._TYPE node the compiler creates will be uniquely
2140 associated with AT MOST one node representing a typedef name.
2141 This way, even though the compiler substitutes corresponding
2142 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2143 early on, later parts of the compiler can always do the reverse
2144 translation and get back the corresponding typedef name. For
2147 typedef struct S MY_TYPE;
2150 Later parts of the compiler might only know that `object' was of
2151 type `struct S' if it were not for code just below. With this
2152 code however, later parts of the compiler see something like:
2154 struct S' == struct S
2155 typedef struct S' MY_TYPE;
2158 And they can then deduce (from the node for type struct S') that
2159 the original object declaration was:
2163 Being able to do this is important for proper support of protoize,
2164 and also for generating precise symbolic debugging information
2165 which takes full account of the programmer's (typedef) vocabulary.
2167 Obviously, we don't want to generate a duplicate ..._TYPE node if
2168 the TYPE_DECL node that we are now processing really represents a
2169 standard built-in type.
2171 Since all standard types are effectively declared at line zero
2172 in the source file, we can easily check to see if we are working
2173 on a standard type by checking the current value of lineno. */
2175 if (TREE_CODE (x) == TYPE_DECL)
2177 if (DECL_SOURCE_LINE (x) == 0)
2179 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2180 TYPE_NAME (TREE_TYPE (x)) = x;
2182 else if (TREE_TYPE (x) != error_mark_node
2183 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2185 tree tt = TREE_TYPE (x);
2186 DECL_ORIGINAL_TYPE (x) = tt;
2187 tt = build_type_copy (tt);
2189 TREE_USED (tt) = TREE_USED (x);
2194 /* Multiple external decls of the same identifier ought to match.
2195 Check against both global declarations (when traditional) and out of
2196 scope (limbo) block level declarations.
2198 We get warnings about inline functions where they are defined.
2199 Avoid duplicate warnings where they are used. */
2201 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2205 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2206 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2207 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2208 decl = IDENTIFIER_GLOBAL_VALUE (name);
2209 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2210 /* Decls in limbo are always extern, so no need to check that. */
2211 decl = IDENTIFIER_LIMBO_VALUE (name);
2215 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2216 /* If old decl is built-in, we already warned if we should. */
2217 && !DECL_BUILT_IN (decl))
2219 pedwarn_with_decl (x,
2220 "type mismatch with previous external decl");
2221 pedwarn_with_decl (decl, "previous external decl of `%s'");
2225 /* If a function has had an implicit declaration, and then is defined,
2226 make sure they are compatible. */
2228 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2229 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2230 && TREE_CODE (x) == FUNCTION_DECL
2231 && ! comptypes (TREE_TYPE (x),
2232 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2234 warning_with_decl (x, "type mismatch with previous implicit declaration");
2235 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2236 "previous implicit declaration of `%s'");
2239 /* In PCC-compatibility mode, extern decls of vars with no current decl
2240 take effect at top level no matter where they are. */
2241 if (flag_traditional && DECL_EXTERNAL (x)
2242 && lookup_name (name) == 0)
2244 tree type = TREE_TYPE (x);
2246 /* But don't do this if the type contains temporary nodes. */
2249 if (type == error_mark_node)
2251 if (TYPE_CONTEXT (type))
2253 warning_with_decl (x, "type of external `%s' is not global");
2254 /* By exiting the loop early, we leave TYPE nonzero,
2255 and thus prevent globalization of the decl. */
2258 else if (TREE_CODE (type) == FUNCTION_TYPE
2259 && TYPE_ARG_TYPES (type) != 0)
2260 /* The types might not be truly local,
2261 but the list of arg types certainly is temporary.
2262 Since prototypes are nontraditional,
2263 ok not to do the traditional thing. */
2265 type = TREE_TYPE (type);
2269 b = global_binding_level;
2272 /* This name is new in its binding level.
2273 Install the new declaration and return it. */
2274 if (b == global_binding_level)
2276 /* Install a global value. */
2278 /* If the first global decl has external linkage,
2279 warn if we later see static one. */
2280 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2281 TREE_PUBLIC (name) = 1;
2283 IDENTIFIER_GLOBAL_VALUE (name) = x;
2285 /* We no longer care about any previous block level declarations. */
2286 IDENTIFIER_LIMBO_VALUE (name) = 0;
2288 /* Don't forget if the function was used via an implicit decl. */
2289 if (IDENTIFIER_IMPLICIT_DECL (name)
2290 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2291 TREE_USED (x) = 1, TREE_USED (name) = 1;
2293 /* Don't forget if its address was taken in that way. */
2294 if (IDENTIFIER_IMPLICIT_DECL (name)
2295 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2296 TREE_ADDRESSABLE (x) = 1;
2298 /* Warn about mismatches against previous implicit decl. */
2299 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2300 /* If this real decl matches the implicit, don't complain. */
2301 && ! (TREE_CODE (x) == FUNCTION_DECL
2302 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2303 == integer_type_node)))
2304 pedwarn ("`%s' was previously implicitly declared to return `int'",
2305 IDENTIFIER_POINTER (name));
2307 /* If this decl is `static' and an `extern' was seen previously,
2308 that is erroneous. */
2309 if (TREE_PUBLIC (name)
2310 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2312 /* Okay to redeclare an ANSI built-in as static. */
2313 if (t != 0 && DECL_BUILT_IN (t))
2315 /* Okay to declare a non-ANSI built-in as anything. */
2316 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2318 /* Okay to have global type decl after an earlier extern
2319 declaration inside a lexical block. */
2320 else if (TREE_CODE (x) == TYPE_DECL)
2322 else if (IDENTIFIER_IMPLICIT_DECL (name))
2324 if (! TREE_THIS_VOLATILE (name))
2325 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2326 IDENTIFIER_POINTER (name));
2329 pedwarn ("`%s' was declared `extern' and later `static'",
2330 IDENTIFIER_POINTER (name));
2335 /* Here to install a non-global value. */
2336 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2337 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2339 IDENTIFIER_LOCAL_VALUE (name) = x;
2341 /* If this is an extern function declaration, see if we
2342 have a global definition or declaration for the function. */
2345 && TREE_CODE (x) == FUNCTION_DECL
2346 && TREE_CODE (oldglobal) == FUNCTION_DECL
2347 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2349 /* We have one. Their types must agree. */
2350 if (! comptypes (TREE_TYPE (x),
2351 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2352 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2355 /* Inner extern decl is inline if global one is.
2356 Copy enough to really inline it. */
2357 if (DECL_INLINE (oldglobal))
2359 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2360 DECL_INITIAL (x) = (current_function_decl == oldglobal
2361 ? 0 : DECL_INITIAL (oldglobal));
2362 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2363 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2364 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2365 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2366 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2367 DECL_ABSTRACT_ORIGIN (x)
2368 = DECL_ABSTRACT_ORIGIN (oldglobal);
2370 /* Inner extern decl is built-in if global one is. */
2371 if (DECL_BUILT_IN (oldglobal))
2373 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2374 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2376 /* Keep the arg types from a file-scope fcn defn. */
2377 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2378 && DECL_INITIAL (oldglobal)
2379 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2380 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2385 /* This case is probably sometimes the right thing to do. */
2386 /* If we have a local external declaration,
2387 then any file-scope declaration should not
2388 have been static. */
2389 if (oldlocal == 0 && oldglobal != 0
2390 && !TREE_PUBLIC (oldglobal)
2391 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2392 warning ("`%s' locally external but globally static",
2393 IDENTIFIER_POINTER (name));
2396 /* If we have a local external declaration,
2397 and no file-scope declaration has yet been seen,
2398 then if we later have a file-scope decl it must not be static. */
2400 && DECL_EXTERNAL (x)
2404 TREE_PUBLIC (name) = 1;
2406 /* Save this decl, so that we can do type checking against
2407 other decls after it falls out of scope.
2409 Only save it once. This prevents temporary decls created in
2410 expand_inline_function from being used here, since this
2411 will have been set when the inline function was parsed.
2412 It also helps give slightly better warnings. */
2413 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2414 IDENTIFIER_LIMBO_VALUE (name) = x;
2417 /* Warn if shadowing an argument at the top level of the body. */
2418 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2419 /* This warning doesn't apply to the parms of a nested fcn. */
2420 && ! current_binding_level->parm_flag
2421 /* Check that this is one level down from the parms. */
2422 && current_binding_level->level_chain->parm_flag
2423 /* Check that the decl being shadowed
2424 comes from the parm level, one level up. */
2425 && chain_member (oldlocal, current_binding_level->level_chain->names))
2427 if (TREE_CODE (oldlocal) == PARM_DECL)
2428 pedwarn ("declaration of `%s' shadows a parameter",
2429 IDENTIFIER_POINTER (name));
2431 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2432 IDENTIFIER_POINTER (name));
2435 /* Maybe warn if shadowing something else. */
2436 else if (warn_shadow && !DECL_EXTERNAL (x)
2437 /* No shadow warnings for internally generated vars. */
2438 && DECL_SOURCE_LINE (x) != 0
2439 /* No shadow warnings for vars made for inlining. */
2440 && ! DECL_FROM_INLINE (x))
2442 const char *id = IDENTIFIER_POINTER (name);
2444 if (TREE_CODE (x) == PARM_DECL
2445 && current_binding_level->level_chain->parm_flag)
2446 /* Don't warn about the parm names in function declarator
2447 within a function declarator.
2448 It would be nice to avoid warning in any function
2449 declarator in a declaration, as opposed to a definition,
2450 but there is no way to tell it's not a definition. */
2452 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2453 warning ("declaration of `%s' shadows a parameter", id);
2454 else if (oldlocal != 0)
2455 warning ("declaration of `%s' shadows previous local", id);
2456 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2457 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2458 warning ("declaration of `%s' shadows global declaration", id);
2461 /* If storing a local value, there may already be one (inherited).
2462 If so, record it for restoration when this binding level ends. */
2464 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2467 /* Keep count of variables in this level with incomplete type.
2468 If the input is erroneous, we can have error_mark in the type
2469 slot (e.g. "f(void a, ...)") - that doesn't count as an
2471 if (TREE_TYPE (x) != error_mark_node
2472 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2476 /* Put decls on list in reverse order.
2477 We will reverse them later if necessary. */
2478 TREE_CHAIN (x) = b->names;
2484 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2487 pushdecl_top_level (x)
2491 register struct binding_level *b = current_binding_level;
2493 current_binding_level = global_binding_level;
2495 current_binding_level = b;
2499 /* Generate an implicit declaration for identifier FUNCTIONID
2500 as a function of type int (). Print a warning if appropriate. */
2503 implicitly_declare (functionid)
2507 int traditional_warning = 0;
2508 /* Only one "implicit declaration" warning per identifier. */
2509 int implicit_warning;
2511 /* We used to reuse an old implicit decl here,
2512 but this loses with inline functions because it can clobber
2513 the saved decl chains. */
2515 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2516 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2519 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2521 /* Warn of implicit decl following explicit local extern decl.
2522 This is probably a program designed for traditional C. */
2523 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2524 traditional_warning = 1;
2526 /* Warn once of an implicit declaration. */
2527 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2529 DECL_EXTERNAL (decl) = 1;
2530 TREE_PUBLIC (decl) = 1;
2532 /* Record that we have an implicit decl and this is it. */
2533 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2535 /* ANSI standard says implicit declarations are in the innermost block.
2536 So we record the decl in the standard fashion.
2537 If flag_traditional is set, pushdecl does it top-level. */
2540 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2541 maybe_objc_check_decl (decl);
2543 rest_of_decl_compilation (decl, NULL, 0, 0);
2545 if (implicit_warning)
2546 implicit_decl_warning (functionid);
2547 else if (warn_traditional && traditional_warning)
2548 warning ("function `%s' was previously declared within a block",
2549 IDENTIFIER_POINTER (functionid));
2551 /* Write a record describing this implicit function declaration to the
2552 prototypes file (if requested). */
2554 gen_aux_info_record (decl, 0, 1, 0);
2560 implicit_decl_warning (id)
2563 const char *name = IDENTIFIER_POINTER (id);
2564 if (mesg_implicit_function_declaration == 2)
2565 error ("implicit declaration of function `%s'", name);
2566 else if (mesg_implicit_function_declaration == 1)
2567 warning ("implicit declaration of function `%s'", name);
2570 /* Return zero if the declaration NEWDECL is valid
2571 when the declaration OLDDECL (assumed to be for the same name)
2572 has already been seen.
2573 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2574 and 3 if it is a conflicting declaration. */
2577 redeclaration_error_message (newdecl, olddecl)
2578 tree newdecl, olddecl;
2580 if (TREE_CODE (newdecl) == TYPE_DECL)
2582 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2584 /* pushdecl creates distinct types for TYPE_DECLs by calling
2585 build_type_copy, so the above comparison generally fails. We do
2586 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2587 is equivalent to what this code used to do before the build_type_copy
2588 call. The variant type distinction should not matter for traditional
2589 code, because it doesn't have type qualifiers. */
2590 if (flag_traditional
2591 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2593 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2597 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2599 /* Declarations of functions can insist on internal linkage
2600 but they can't be inconsistent with internal linkage,
2601 so there can be no error on that account.
2602 However defining the same name twice is no good. */
2603 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2604 /* However, defining once as extern inline and a second
2605 time in another way is ok. */
2606 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2607 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2611 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2613 /* Objects declared at top level: */
2614 /* If at least one is a reference, it's ok. */
2615 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2617 /* Reject two definitions. */
2618 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2620 /* Now we have two tentative defs, or one tentative and one real def. */
2621 /* Insist that the linkage match. */
2622 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2626 else if (current_binding_level->parm_flag
2627 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2631 /* Newdecl has block scope. If olddecl has block scope also, then
2632 reject two definitions, and reject a definition together with an
2633 external reference. Otherwise, it is OK, because newdecl must
2634 be an extern reference to olddecl. */
2635 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2636 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2642 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2643 Create one if none exists so far for the current function.
2644 This function is called for both label definitions and label references. */
2650 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2652 if (current_function_decl == 0)
2654 error ("label %s referenced outside of any function",
2655 IDENTIFIER_POINTER (id));
2659 /* Use a label already defined or ref'd with this name. */
2662 /* But not if it is inherited and wasn't declared to be inheritable. */
2663 if (DECL_CONTEXT (decl) != current_function_decl
2664 && ! C_DECLARED_LABEL_FLAG (decl))
2665 return shadow_label (id);
2669 decl = build_decl (LABEL_DECL, id, void_type_node);
2671 /* A label not explicitly declared must be local to where it's ref'd. */
2672 DECL_CONTEXT (decl) = current_function_decl;
2674 DECL_MODE (decl) = VOIDmode;
2676 /* Say where one reference is to the label,
2677 for the sake of the error if it is not defined. */
2678 DECL_SOURCE_LINE (decl) = lineno;
2679 DECL_SOURCE_FILE (decl) = input_filename;
2681 IDENTIFIER_LABEL_VALUE (id) = decl;
2683 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2688 /* Make a label named NAME in the current function,
2689 shadowing silently any that may be inherited from containing functions
2690 or containing scopes.
2692 Note that valid use, if the label being shadowed
2693 comes from another scope in the same function,
2694 requires calling declare_nonlocal_label right away. */
2700 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2706 /* Check to make sure that the label hasn't already been declared
2707 at this label scope */
2708 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2709 if (TREE_VALUE (dup) == decl)
2711 error ("duplicate label declaration `%s'",
2712 IDENTIFIER_POINTER (name));
2713 error_with_decl (TREE_VALUE (dup),
2714 "this is a previous declaration");
2715 /* Just use the previous declaration. */
2716 return lookup_label (name);
2719 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2720 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2723 return lookup_label (name);
2726 /* Define a label, specifying the location in the source file.
2727 Return the LABEL_DECL node for the label, if the definition is valid.
2728 Otherwise return 0. */
2731 define_label (filename, line, name)
2732 const char *filename;
2736 tree decl = lookup_label (name);
2738 /* If label with this name is known from an outer context, shadow it. */
2739 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2741 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2742 IDENTIFIER_LABEL_VALUE (name) = 0;
2743 decl = lookup_label (name);
2746 if (warn_traditional && !in_system_header && lookup_name (name))
2747 warning_with_file_and_line (filename, line,
2748 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2749 IDENTIFIER_POINTER (name));
2751 if (DECL_INITIAL (decl) != 0)
2753 error_with_file_and_line (filename, line, "duplicate label `%s'",
2754 IDENTIFIER_POINTER (name));
2759 /* Mark label as having been defined. */
2760 DECL_INITIAL (decl) = error_mark_node;
2761 /* Say where in the source. */
2762 DECL_SOURCE_FILE (decl) = filename;
2763 DECL_SOURCE_LINE (decl) = line;
2768 /* Return the list of declarations of the current level.
2769 Note that this list is in reverse order unless/until
2770 you nreverse it; and when you do nreverse it, you must
2771 store the result back using `storedecls' or you will lose. */
2776 return current_binding_level->names;
2779 /* Return the list of type-tags (for structs, etc) of the current level. */
2784 return current_binding_level->tags;
2787 /* Store the list of declarations of the current level.
2788 This is done for the parameter declarations of a function being defined,
2789 after they are modified in the light of any missing parameters. */
2795 current_binding_level->names = decls;
2798 /* Similarly, store the list of tags of the current level. */
2804 current_binding_level->tags = tags;
2807 /* Given NAME, an IDENTIFIER_NODE,
2808 return the structure (or union or enum) definition for that name.
2809 Searches binding levels from BINDING_LEVEL up to the global level.
2810 If THISLEVEL_ONLY is nonzero, searches only the specified context
2811 (but skips any tag-transparent contexts to find one that is
2812 meaningful for tags).
2813 CODE says which kind of type the caller wants;
2814 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2815 If the wrong kind of type is found, an error is reported. */
2818 lookup_tag (code, name, binding_level, thislevel_only)
2819 enum tree_code code;
2820 struct binding_level *binding_level;
2824 register struct binding_level *level;
2827 for (level = binding_level; level; level = level->level_chain)
2830 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2832 if (TREE_PURPOSE (tail) == name)
2834 if (TREE_CODE (TREE_VALUE (tail)) != code)
2836 /* Definition isn't the kind we were looking for. */
2837 pending_invalid_xref = name;
2838 pending_invalid_xref_file = input_filename;
2839 pending_invalid_xref_line = lineno;
2840 /* If in the same binding level as a declaration as a tag
2841 of a different type, this must not be allowed to
2842 shadow that tag, so give the error immediately.
2843 (For example, "struct foo; union foo;" is invalid.) */
2845 pending_xref_error ();
2847 return TREE_VALUE (tail);
2850 if (! level->tag_transparent)
2860 /* Print an error message now
2861 for a recent invalid struct, union or enum cross reference.
2862 We don't print them immediately because they are not invalid
2863 when used in the `struct foo;' construct for shadowing. */
2866 pending_xref_error ()
2868 if (pending_invalid_xref != 0)
2869 error_with_file_and_line (pending_invalid_xref_file,
2870 pending_invalid_xref_line,
2871 "`%s' defined as wrong kind of tag",
2872 IDENTIFIER_POINTER (pending_invalid_xref));
2873 pending_invalid_xref = 0;
2876 /* Given a type, find the tag that was defined for it and return the tag name.
2877 Otherwise return 0. */
2880 lookup_tag_reverse (type)
2883 register struct binding_level *level;
2885 for (level = current_binding_level; level; level = level->level_chain)
2888 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2890 if (TREE_VALUE (tail) == type)
2891 return TREE_PURPOSE (tail);
2897 /* Look up NAME in the current binding level and its superiors
2898 in the namespace of variables, functions and typedefs.
2899 Return a ..._DECL node of some kind representing its definition,
2900 or return 0 if it is undefined. */
2908 if (current_binding_level != global_binding_level
2909 && IDENTIFIER_LOCAL_VALUE (name))
2910 val = IDENTIFIER_LOCAL_VALUE (name);
2912 val = IDENTIFIER_GLOBAL_VALUE (name);
2916 /* Similar to `lookup_name' but look only at current binding level. */
2919 lookup_name_current_level (name)
2924 if (current_binding_level == global_binding_level)
2925 return IDENTIFIER_GLOBAL_VALUE (name);
2927 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2930 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2931 if (DECL_NAME (t) == name)
2937 /* Mark ARG for GC. */
2940 mark_binding_level (arg)
2943 struct binding_level *level = *(struct binding_level **) arg;
2945 for (; level != 0; level = level->level_chain)
2947 ggc_mark_tree (level->names);
2948 ggc_mark_tree (level->tags);
2949 ggc_mark_tree (level->shadowed);
2950 ggc_mark_tree (level->blocks);
2951 ggc_mark_tree (level->this_block);
2952 ggc_mark_tree (level->parm_order);
2956 /* Create the predefined scalar types of C,
2957 and some nodes representing standard constants (0, 1, (void *) 0).
2958 Initialize the global binding level.
2959 Make definitions for built-in primitive functions. */
2962 init_decl_processing ()
2964 register tree endlink;
2965 tree ptr_ftype_void, ptr_ftype_ptr;
2967 current_function_decl = NULL;
2968 named_labels = NULL;
2969 current_binding_level = NULL_BINDING_LEVEL;
2970 free_binding_level = NULL_BINDING_LEVEL;
2972 /* Make the binding_level structure for global names. */
2974 global_binding_level = current_binding_level;
2976 build_common_tree_nodes (flag_signed_char);
2978 c_common_nodes_and_builtins ();
2980 boolean_type_node = integer_type_node;
2981 boolean_true_node = integer_one_node;
2982 boolean_false_node = integer_zero_node;
2984 /* With GCC, C99's _Bool is always of size 1. */
2985 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2986 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2987 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2988 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2989 TYPE_PRECISION (c_bool_type_node) = 1;
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2992 c_bool_false_node = build_int_2 (0, 0);
2993 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2994 c_bool_true_node = build_int_2 (1, 0);
2995 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2997 endlink = void_list_node;
2998 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3000 = build_function_type (ptr_type_node,
3001 tree_cons (NULL_TREE, ptr_type_node, endlink));
3003 /* Types which are common to the fortran compiler and libf2c. When
3004 changing these, you also need to be concerned with f/com.h. */
3006 if (TYPE_PRECISION (float_type_node)
3007 == TYPE_PRECISION (long_integer_type_node))
3009 g77_integer_type_node = long_integer_type_node;
3010 g77_uinteger_type_node = long_unsigned_type_node;
3012 else if (TYPE_PRECISION (float_type_node)
3013 == TYPE_PRECISION (integer_type_node))
3015 g77_integer_type_node = integer_type_node;
3016 g77_uinteger_type_node = unsigned_type_node;
3019 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3021 if (g77_integer_type_node != NULL_TREE)
3023 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3024 g77_integer_type_node));
3025 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3026 g77_uinteger_type_node));
3029 if (TYPE_PRECISION (float_type_node) * 2
3030 == TYPE_PRECISION (long_integer_type_node))
3032 g77_longint_type_node = long_integer_type_node;
3033 g77_ulongint_type_node = long_unsigned_type_node;
3035 else if (TYPE_PRECISION (float_type_node) * 2
3036 == TYPE_PRECISION (long_long_integer_type_node))
3038 g77_longint_type_node = long_long_integer_type_node;
3039 g77_ulongint_type_node = long_long_unsigned_type_node;
3042 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3044 if (g77_longint_type_node != NULL_TREE)
3046 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3047 g77_longint_type_node));
3048 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3049 g77_ulongint_type_node));
3052 pedantic_lvalues = pedantic;
3054 make_fname_decl = c_make_fname_decl;
3055 start_fname_decls ();
3057 /* Prepare to check format strings against argument lists. */
3058 init_function_format_info ();
3060 incomplete_decl_finalize_hook = finish_incomplete_decl;
3062 /* Record our roots. */
3064 ggc_add_tree_root (c_global_trees, CTI_MAX);
3065 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3066 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3067 ggc_add_tree_root (&named_labels, 1);
3068 ggc_add_tree_root (&shadowed_labels, 1);
3069 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3070 mark_binding_level);
3071 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3072 mark_binding_level);
3073 ggc_add_tree_root (&static_ctors, 1);
3074 ggc_add_tree_root (&static_dtors, 1);
3077 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3078 decl, NAME is the initialization string and TYPE_DEP indicates whether
3079 NAME depended on the type of the function. As we don't yet implement
3080 delayed emission of static data, we mark the decl as emitted
3081 so it is not placed in the output. Anything using it must therefore pull
3082 out the STRING_CST initializer directly. This does mean that these names
3083 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3086 c_make_fname_decl (id, type_dep)
3090 const char *name = fname_as_string (type_dep);
3091 tree decl, type, init;
3092 size_t length = strlen (name);
3094 type = build_array_type
3095 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3096 build_index_type (size_int (length)));
3098 decl = build_decl (VAR_DECL, id, type);
3099 /* We don't push the decl, so have to set its context here. */
3100 DECL_CONTEXT (decl) = current_function_decl;
3102 TREE_STATIC (decl) = 1;
3103 TREE_READONLY (decl) = 1;
3104 DECL_ARTIFICIAL (decl) = 1;
3106 init = build_string (length + 1, name);
3107 TREE_TYPE (init) = type;
3108 DECL_INITIAL (decl) = init;
3110 TREE_USED (decl) = 1;
3112 finish_decl (decl, init, NULL_TREE);
3117 /* Return a definition for a builtin function named NAME and whose data type
3118 is TYPE. TYPE should be a function type with argument types.
3119 FUNCTION_CODE tells later passes how to compile calls to this function.
3120 See tree.h for its possible values.
3122 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3123 the name to be called if we can't opencode the function. */
3126 builtin_function (name, type, function_code, class, library_name)
3130 enum built_in_class class;
3131 const char *library_name;
3133 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3134 DECL_EXTERNAL (decl) = 1;
3135 TREE_PUBLIC (decl) = 1;
3136 /* If -traditional, permit redefining a builtin function any way you like.
3137 (Though really, if the program redefines these functions,
3138 it probably won't work right unless compiled with -fno-builtin.) */
3139 if (flag_traditional && name[0] != '_')
3140 DECL_BUILT_IN_NONANSI (decl) = 1;
3142 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3143 make_decl_rtl (decl, NULL);
3145 DECL_BUILT_IN_CLASS (decl) = class;
3146 DECL_FUNCTION_CODE (decl) = function_code;
3148 /* Warn if a function in the namespace for users
3149 is used without an occasion to consider it declared. */
3150 if (name[0] != '_' || name[1] != '_')
3151 C_DECL_ANTICIPATED (decl) = 1;
3156 /* Called when a declaration is seen that contains no names to declare.
3157 If its type is a reference to a structure, union or enum inherited
3158 from a containing scope, shadow that tag name for the current scope
3159 with a forward reference.
3160 If its type defines a new named structure or union
3161 or defines an enum, it is valid but we need not do anything here.
3162 Otherwise, it is an error. */
3165 shadow_tag (declspecs)
3168 shadow_tag_warned (declspecs, 0);
3172 shadow_tag_warned (declspecs, warned)
3175 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3182 pending_invalid_xref = 0;
3184 /* Remove the attributes from declspecs, since they will confuse the
3186 split_specs_attrs (declspecs, &specs, &attrs);
3188 for (link = specs; link; link = TREE_CHAIN (link))
3190 register tree value = TREE_VALUE (link);
3191 register enum tree_code code = TREE_CODE (value);
3193 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3194 /* Used to test also that TYPE_SIZE (value) != 0.
3195 That caused warning for `struct foo;' at top level in the file. */
3197 register tree name = lookup_tag_reverse (value);
3204 if (warned != 1 && code != ENUMERAL_TYPE)
3205 /* Empty unnamed enum OK */
3207 pedwarn ("unnamed struct/union that defines no instances");
3213 t = lookup_tag (code, name, current_binding_level, 1);
3217 t = make_node (code);
3224 if (!warned && ! in_system_header)
3226 warning ("useless keyword or type name in empty declaration");
3233 error ("two types specified in one empty declaration");
3238 pedwarn ("empty declaration");
3242 /* Construct an array declarator. EXPR is the expression inside [], or
3243 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3244 to the pointer to which a parameter array is converted). STATIC_P is
3245 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3246 is non-zero is the array is [*], a VLA of unspecified length which is
3247 nevertheless a complete type (not currently implemented by GCC),
3248 zero otherwise. The declarator is constructed as an ARRAY_REF
3249 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3250 left of the [] (filled by in set_array_declarator_type) and operand 1
3251 is the expression inside; whose TREE_TYPE is the type qualifiers and
3252 which has TREE_STATIC set if "static" is used. */
3255 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3262 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3263 TREE_TYPE (decl) = quals;
3264 TREE_STATIC (decl) = (static_p ? 1 : 0);
3265 if (pedantic && !flag_isoc99)
3267 if (static_p || quals != NULL_TREE)
3268 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3270 pedwarn ("ISO C89 does not support `[*]' array declarators");
3273 warning ("GCC does not yet properly implement `[*]' array declarators");
3277 /* Set the type of an array declarator. DECL is the declarator, as
3278 constructed by build_array_declarator; TYPE is what appears on the left
3279 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3280 abstract declarator, zero otherwise; this is used to reject static and
3281 type qualifiers in abstract declarators, where they are not in the
3285 set_array_declarator_type (decl, type, abstract_p)
3290 TREE_OPERAND (decl, 0) = type;
3291 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3292 error ("static or type qualifiers in abstract declarator");
3296 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3299 groktypename (typename)
3302 if (TREE_CODE (typename) != TREE_LIST)
3304 return grokdeclarator (TREE_VALUE (typename),
3305 TREE_PURPOSE (typename),
3309 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3312 groktypename_in_parm_context (typename)
3315 if (TREE_CODE (typename) != TREE_LIST)
3317 return grokdeclarator (TREE_VALUE (typename),
3318 TREE_PURPOSE (typename),
3322 /* Decode a declarator in an ordinary declaration or data definition.
3323 This is called as soon as the type information and variable name
3324 have been parsed, before parsing the initializer if any.
3325 Here we create the ..._DECL node, fill in its type,
3326 and put it on the list of decls for the current context.
3327 The ..._DECL node is returned as the value.
3329 Exception: for arrays where the length is not specified,
3330 the type is left null, to be filled in by `finish_decl'.
3332 Function definitions do not come here; they go to start_function
3333 instead. However, external and forward declarations of functions
3334 do go through here. Structure field declarations are done by
3335 grokfield and not through here. */
3338 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3339 tree declarator, declspecs;
3341 tree attributes, prefix_attributes;
3343 register tree decl = grokdeclarator (declarator, declspecs,
3344 NORMAL, initialized);
3347 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3348 && MAIN_NAME_P (DECL_NAME (decl)))
3349 warning_with_decl (decl, "`%s' is usually a function");
3352 /* Is it valid for this decl to have an initializer at all?
3353 If not, set INITIALIZED to zero, which will indirectly
3354 tell `finish_decl' to ignore the initializer once it is parsed. */
3355 switch (TREE_CODE (decl))
3358 /* typedef foo = bar means give foo the same type as bar.
3359 We haven't parsed bar yet, so `finish_decl' will fix that up.
3360 Any other case of an initialization in a TYPE_DECL is an error. */
3361 if (pedantic || list_length (declspecs) > 1)
3363 error ("typedef `%s' is initialized",
3364 IDENTIFIER_POINTER (DECL_NAME (decl)));
3370 error ("function `%s' is initialized like a variable",
3371 IDENTIFIER_POINTER (DECL_NAME (decl)));
3376 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3377 error ("parameter `%s' is initialized",
3378 IDENTIFIER_POINTER (DECL_NAME (decl)));
3383 /* Don't allow initializations for incomplete types
3384 except for arrays which might be completed by the initialization. */
3386 /* This can happen if the array size is an undefined macro. We already
3387 gave a warning, so we don't need another one. */
3388 if (TREE_TYPE (decl) == error_mark_node)
3390 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3392 /* A complete type is ok if size is fixed. */
3394 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3395 || C_DECL_VARIABLE_SIZE (decl))
3397 error ("variable-sized object may not be initialized");
3401 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3403 error ("variable `%s' has initializer but incomplete type",
3404 IDENTIFIER_POINTER (DECL_NAME (decl)));
3407 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3409 error ("elements of array `%s' have incomplete type",
3410 IDENTIFIER_POINTER (DECL_NAME (decl)));
3418 /* Seems redundant with grokdeclarator. */
3419 if (current_binding_level != global_binding_level
3420 && DECL_EXTERNAL (decl)
3421 && TREE_CODE (decl) != FUNCTION_DECL)
3422 warning ("declaration of `%s' has `extern' and is initialized",
3423 IDENTIFIER_POINTER (DECL_NAME (decl)));
3425 DECL_EXTERNAL (decl) = 0;
3426 if (current_binding_level == global_binding_level)
3427 TREE_STATIC (decl) = 1;
3429 /* Tell `pushdecl' this is an initialized decl
3430 even though we don't yet have the initializer expression.
3431 Also tell `finish_decl' it may store the real initializer. */
3432 DECL_INITIAL (decl) = error_mark_node;
3435 /* If this is a function declaration, write a record describing it to the
3436 prototypes file (if requested). */
3438 if (TREE_CODE (decl) == FUNCTION_DECL)
3439 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3441 /* ANSI specifies that a tentative definition which is not merged with
3442 a non-tentative definition behaves exactly like a definition with an
3443 initializer equal to zero. (Section 3.7.2)
3444 -fno-common gives strict ANSI behavior. Usually you don't want it.
3445 This matters only for variables with external linkage. */
3446 if (! flag_no_common || ! TREE_PUBLIC (decl))
3447 DECL_COMMON (decl) = 1;
3449 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3450 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3453 /* Set attributes here so if duplicate decl, will have proper attributes. */
3454 decl_attributes (decl, attributes, prefix_attributes);
3456 /* Add this decl to the current binding level.
3457 TEM may equal DECL or it may be a previous decl of the same name. */
3458 tem = pushdecl (decl);
3460 /* For a local variable, define the RTL now. */
3461 if (current_binding_level != global_binding_level
3462 /* But not if this is a duplicate decl
3463 and we preserved the rtl from the previous one
3464 (which may or may not happen). */
3465 && !DECL_RTL_SET_P (tem)
3466 && !DECL_CONTEXT (tem))
3468 if (TREE_TYPE (tem) != error_mark_node
3469 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3471 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3472 && DECL_INITIAL (tem) != 0)
3479 /* Finish processing of a declaration;
3480 install its initial value.
3481 If the length of an array type is not known before,
3482 it must be determined now, from the initial value, or it is an error. */
3485 finish_decl (decl, init, asmspec_tree)
3489 register tree type = TREE_TYPE (decl);
3490 int was_incomplete = (DECL_SIZE (decl) == 0);
3491 const char *asmspec = 0;
3493 /* If a name was specified, get the string. */
3495 asmspec = TREE_STRING_POINTER (asmspec_tree);
3497 /* If `start_decl' didn't like having an initialization, ignore it now. */
3498 if (init != 0 && DECL_INITIAL (decl) == 0)
3501 /* Don't crash if parm is initialized. */
3502 if (TREE_CODE (decl) == PARM_DECL)
3507 if (TREE_CODE (decl) != TYPE_DECL)
3508 store_init_value (decl, init);
3511 /* typedef foo = bar; store the type of bar as the type of foo. */
3512 TREE_TYPE (decl) = TREE_TYPE (init);
3513 DECL_INITIAL (decl) = init = 0;
3517 /* Deduce size of array from initialization, if not already known */
3518 if (TREE_CODE (type) == ARRAY_TYPE
3519 && TYPE_DOMAIN (type) == 0
3520 && TREE_CODE (decl) != TYPE_DECL)
3523 = (TREE_STATIC (decl)
3524 /* Even if pedantic, an external linkage array
3525 may have incomplete type at first. */
3526 ? pedantic && !TREE_PUBLIC (decl)
3527 : !DECL_EXTERNAL (decl));
3529 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3531 /* Get the completed type made by complete_array_type. */
3532 type = TREE_TYPE (decl);
3535 error_with_decl (decl, "initializer fails to determine size of `%s'");
3537 else if (failure == 2)
3540 error_with_decl (decl, "array size missing in `%s'");
3541 /* If a `static' var's size isn't known,
3542 make it extern as well as static, so it does not get
3544 If it is not `static', then do not mark extern;
3545 finish_incomplete_decl will give it a default size
3546 and it will get allocated. */
3547 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3548 DECL_EXTERNAL (decl) = 1;
3551 /* TYPE_MAX_VALUE is always one less than the number of elements
3552 in the array, because we start counting at zero. Therefore,
3553 warn only if the value is less than zero. */
3554 else if (pedantic && TYPE_DOMAIN (type) != 0
3555 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3556 error_with_decl (decl, "zero or negative size array `%s'");
3558 layout_decl (decl, 0);
3561 if (TREE_CODE (decl) == VAR_DECL)
3563 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3564 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3565 layout_decl (decl, 0);
3567 if (DECL_SIZE (decl) == 0
3568 /* Don't give an error if we already gave one earlier. */
3569 && TREE_TYPE (decl) != error_mark_node
3570 && (TREE_STATIC (decl)
3572 /* A static variable with an incomplete type
3573 is an error if it is initialized.
3574 Also if it is not file scope.
3575 Otherwise, let it through, but if it is not `extern'
3576 then it may cause an error message later. */
3577 (DECL_INITIAL (decl) != 0
3578 || DECL_CONTEXT (decl) != 0)
3580 /* An automatic variable with an incomplete type
3582 !DECL_EXTERNAL (decl)))
3584 error_with_decl (decl, "storage size of `%s' isn't known");
3585 TREE_TYPE (decl) = error_mark_node;
3588 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3589 && DECL_SIZE (decl) != 0)
3591 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3592 constant_expression_warning (DECL_SIZE (decl));
3594 error_with_decl (decl, "storage size of `%s' isn't constant");
3597 if (TREE_USED (type))
3598 TREE_USED (decl) = 1;
3601 /* If this is a function and an assembler name is specified, it isn't
3602 builtin any more. Also reset DECL_RTL so we can give it its new
3604 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3606 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3607 SET_DECL_RTL (decl, NULL_RTX);
3608 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3611 /* Output the assembler code and/or RTL code for variables and functions,
3612 unless the type is an undefined structure or union.
3613 If not, it will get done when the type is completed. */
3615 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3617 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3618 maybe_objc_check_decl (decl);
3620 if (!DECL_CONTEXT (decl))
3622 if (DECL_INITIAL (decl) == NULL_TREE
3623 || DECL_INITIAL (decl) == error_mark_node)
3624 /* Don't output anything
3625 when a tentative file-scope definition is seen.
3626 But at end of compilation, do output code for them. */
3627 DECL_DEFER_OUTPUT (decl) = 1;
3628 rest_of_decl_compilation (decl, asmspec,
3629 (DECL_CONTEXT (decl) == 0
3630 || TREE_ASM_WRITTEN (decl)), 0);
3634 /* This is a local variable. If there is an ASMSPEC, the
3635 user has requested that we handle it specially. */
3638 /* In conjunction with an ASMSPEC, the `register'
3639 keyword indicates that we should place the variable
3640 in a particular register. */
3641 if (DECL_REGISTER (decl))
3642 DECL_C_HARD_REGISTER (decl) = 1;
3644 /* If this is not a static variable, issue a warning.
3645 It doesn't make any sense to give an ASMSPEC for an
3646 ordinary, non-register local variable. Historically,
3647 GCC has accepted -- but ignored -- the ASMSPEC in
3649 if (TREE_CODE (decl) == VAR_DECL
3650 && !DECL_REGISTER (decl)
3651 && !TREE_STATIC (decl))
3652 warning_with_decl (decl,
3653 "ignoring asm-specifier for non-static local variable `%s'");
3655 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3658 add_decl_stmt (decl);
3661 if (DECL_CONTEXT (decl) != 0)
3663 /* Recompute the RTL of a local array now
3664 if it used to be an incomplete type. */
3666 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3668 /* If we used it already as memory, it must stay in memory. */
3669 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3670 /* If it's still incomplete now, no init will save it. */
3671 if (DECL_SIZE (decl) == 0)
3672 DECL_INITIAL (decl) = 0;
3677 if (TREE_CODE (decl) == TYPE_DECL)
3679 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3680 maybe_objc_check_decl (decl);
3681 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3684 /* At the end of a declaration, throw away any variable type sizes
3685 of types defined inside that declaration. There is no use
3686 computing them in the following function definition. */
3687 if (current_binding_level == global_binding_level)
3688 get_pending_sizes ();
3691 /* If DECL has a cleanup, build and return that cleanup here.
3692 This is a callback called by expand_expr. */
3695 maybe_build_cleanup (decl)
3696 tree decl ATTRIBUTE_UNUSED;
3698 /* There are no cleanups in C. */
3702 /* Given a parsed parameter declaration,
3703 decode it into a PARM_DECL and push that on the current binding level.
3704 Also, for the sake of forward parm decls,
3705 record the given order of parms in `parm_order'. */
3708 push_parm_decl (parm)
3712 int old_immediate_size_expand = immediate_size_expand;
3713 /* Don't try computing parm sizes now -- wait till fn is called. */
3714 immediate_size_expand = 0;
3716 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3717 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3718 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3719 TREE_PURPOSE (TREE_VALUE (parm)));
3722 if (DECL_NAME (decl))
3725 olddecl = lookup_name (DECL_NAME (decl));
3726 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3727 pedwarn_with_decl (decl,
3728 "ANSI C forbids parameter `%s' shadowing typedef");
3732 decl = pushdecl (decl);
3734 immediate_size_expand = old_immediate_size_expand;
3736 current_binding_level->parm_order
3737 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3739 /* Add this decl to the current binding level. */
3740 finish_decl (decl, NULL_TREE, NULL_TREE);
3743 /* Clear the given order of parms in `parm_order'.
3744 Used at start of parm list,
3745 and also at semicolon terminating forward decls. */
3750 current_binding_level->parm_order = NULL_TREE;
3753 /* Make TYPE a complete type based on INITIAL_VALUE.
3754 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3755 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3758 complete_array_type (type, initial_value, do_default)
3763 register tree maxindex = NULL_TREE;
3768 /* Note MAXINDEX is really the maximum index,
3769 one less than the size. */
3770 if (TREE_CODE (initial_value) == STRING_CST)
3773 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3774 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3777 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3779 tree elts = CONSTRUCTOR_ELTS (initial_value);
3780 maxindex = build_int_2 (-1, -1);
3781 for (; elts; elts = TREE_CHAIN (elts))
3783 if (TREE_PURPOSE (elts))
3784 maxindex = TREE_PURPOSE (elts);
3786 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3787 maxindex, integer_one_node));
3789 maxindex = copy_node (maxindex);
3793 /* Make an error message unless that happened already. */
3794 if (initial_value != error_mark_node)
3797 /* Prevent further error messages. */
3798 maxindex = build_int_2 (0, 0);
3805 maxindex = build_int_2 (0, 0);
3811 TYPE_DOMAIN (type) = build_index_type (maxindex);
3812 if (!TREE_TYPE (maxindex))
3813 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3816 /* Lay out the type now that we can get the real answer. */
3823 /* Given declspecs and a declarator,
3824 determine the name and type of the object declared
3825 and construct a ..._DECL node for it.
3826 (In one case we can return a ..._TYPE node instead.
3827 For invalid input we sometimes return 0.)
3829 DECLSPECS is a chain of tree_list nodes whose value fields
3830 are the storage classes and type specifiers.
3832 DECL_CONTEXT says which syntactic context this declaration is in:
3833 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3834 FUNCDEF for a function definition. Like NORMAL but a few different
3835 error messages in each case. Return value may be zero meaning
3836 this definition is too screwy to try to parse.
3837 PARM for a parameter declaration (either within a function prototype
3838 or before a function body). Make a PARM_DECL, or return void_type_node.
3839 TYPENAME if for a typename (in a cast or sizeof).
3840 Don't make a DECL node; just return the ..._TYPE node.
3841 FIELD for a struct or union field; make a FIELD_DECL.
3842 BITFIELD for a field with specified width.
3843 INITIALIZED is 1 if the decl has an initializer.
3845 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3846 It may also be so in the PARM case, for a prototype where the
3847 argument type is specified but not the name.
3849 This function is where the complicated C meanings of `static'
3850 and `extern' are interpreted. */
3853 grokdeclarator (declarator, declspecs, decl_context, initialized)
3856 enum decl_context decl_context;
3861 tree type = NULL_TREE;
3866 int type_quals = TYPE_UNQUALIFIED;
3868 int explicit_int = 0;
3869 int explicit_char = 0;
3870 int defaulted_int = 0;
3871 tree typedef_decl = 0;
3873 tree typedef_type = 0;
3874 int funcdef_flag = 0;
3875 enum tree_code innermost_code = ERROR_MARK;
3877 int size_varies = 0;
3878 tree decl_machine_attr = NULL_TREE;
3879 tree array_ptr_quals = NULL_TREE;
3880 int array_parm_static = 0;
3882 if (decl_context == BITFIELD)
3883 bitfield = 1, decl_context = FIELD;
3885 if (decl_context == FUNCDEF)
3886 funcdef_flag = 1, decl_context = NORMAL;
3888 /* Look inside a declarator for the name being declared
3889 and get it as a string, for an error message. */
3891 register tree decl = declarator;
3895 switch (TREE_CODE (decl))
3900 innermost_code = TREE_CODE (decl);
3901 decl = TREE_OPERAND (decl, 0);
3904 case IDENTIFIER_NODE:
3905 name = IDENTIFIER_POINTER (decl);
3916 /* A function definition's declarator must have the form of
3917 a function declarator. */
3919 if (funcdef_flag && innermost_code != CALL_EXPR)
3922 /* Anything declared one level down from the top level
3923 must be one of the parameters of a function
3924 (because the body is at least two levels down). */
3926 /* If this looks like a function definition, make it one,
3927 even if it occurs where parms are expected.
3928 Then store_parm_decls will reject it and not use it as a parm. */
3929 if (decl_context == NORMAL && !funcdef_flag
3930 && current_binding_level->parm_flag)
3931 decl_context = PARM;
3933 /* Look through the decl specs and record which ones appear.
3934 Some typespecs are defined as built-in typenames.
3935 Others, the ones that are modifiers of other types,
3936 are represented by bits in SPECBITS: set the bits for
3937 the modifiers that appear. Storage class keywords are also in SPECBITS.
3939 If there is a typedef name or a type, store the type in TYPE.
3940 This includes builtin typedefs such as `int'.
3942 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3943 and did not come from a user typedef.
3945 Set LONGLONG if `long' is mentioned twice. */
3947 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3949 register tree id = TREE_VALUE (spec);
3951 if (id == ridpointers[(int) RID_INT])
3953 if (id == ridpointers[(int) RID_CHAR])
3956 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3958 enum rid i = C_RID_CODE (id);
3959 if ((int) i <= (int) RID_LAST_MODIFIER)
3961 if (i == RID_LONG && (specbits & (1 << (int) i)))
3964 error ("`long long long' is too long for GCC");
3967 if (pedantic && !flag_isoc99 && ! in_system_header
3969 pedwarn ("ISO C89 does not support `long long'");
3973 else if (specbits & (1 << (int) i))
3974 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3975 specbits |= 1 << (int) i;
3980 error ("two or more data types in declaration of `%s'", name);
3981 /* Actual typedefs come to us as TYPE_DECL nodes. */
3982 else if (TREE_CODE (id) == TYPE_DECL)
3984 type = TREE_TYPE (id);
3985 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3988 /* Built-in types come as identifiers. */
3989 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3991 register tree t = lookup_name (id);
3992 if (TREE_TYPE (t) == error_mark_node)
3994 else if (!t || TREE_CODE (t) != TYPE_DECL)
3995 error ("`%s' fails to be a typedef or built in type",
3996 IDENTIFIER_POINTER (id));
3999 type = TREE_TYPE (t);
4003 else if (TREE_CODE (id) != ERROR_MARK)
4010 typedef_type = type;
4012 size_varies = C_TYPE_VARIABLE_SIZE (type);
4014 /* No type at all: default to `int', and set DEFAULTED_INT
4015 because it was not a user-defined typedef. */
4019 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4020 | (1 << (int) RID_SIGNED)
4021 | (1 << (int) RID_UNSIGNED)
4022 | (1 << (int) RID_COMPLEX))))
4023 /* Don't warn about typedef foo = bar. */
4024 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4025 && ! in_system_header)
4027 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4028 and this is a function, or if -Wimplicit; prefer the former
4029 warning since it is more explicit. */
4030 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4032 warn_about_return_type = 1;
4033 else if (warn_implicit_int || flag_isoc99)
4034 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4039 type = integer_type_node;
4042 /* Now process the modifiers that were specified
4043 and check for invalid combinations. */
4045 /* Long double is a special combination. */
4047 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4048 && TYPE_MAIN_VARIANT (type) == double_type_node)
4050 specbits &= ~(1 << (int) RID_LONG);
4051 type = long_double_type_node;
4054 /* Check all other uses of type modifiers. */
4056 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4057 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4061 if ((specbits & 1 << (int) RID_LONG)
4062 && (specbits & 1 << (int) RID_SHORT))
4063 error ("both long and short specified for `%s'", name);
4064 else if (((specbits & 1 << (int) RID_LONG)
4065 || (specbits & 1 << (int) RID_SHORT))
4067 error ("long or short specified with char for `%s'", name);
4068 else if (((specbits & 1 << (int) RID_LONG)
4069 || (specbits & 1 << (int) RID_SHORT))
4070 && TREE_CODE (type) == REAL_TYPE)
4072 static int already = 0;
4074 error ("long or short specified with floating type for `%s'", name);
4075 if (! already && ! pedantic)
4077 error ("the only valid combination is `long double'");
4081 else if ((specbits & 1 << (int) RID_SIGNED)
4082 && (specbits & 1 << (int) RID_UNSIGNED))
4083 error ("both signed and unsigned specified for `%s'", name);
4084 else if (TREE_CODE (type) != INTEGER_TYPE)
4085 error ("long, short, signed or unsigned invalid for `%s'", name);
4089 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4091 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4093 if (flag_pedantic_errors)
4098 /* Discard the type modifiers if they are invalid. */
4101 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4102 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4107 if ((specbits & (1 << (int) RID_COMPLEX))
4108 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4110 error ("complex invalid for `%s'", name);
4111 specbits &= ~(1 << (int) RID_COMPLEX);
4114 /* Decide whether an integer type is signed or not.
4115 Optionally treat bitfields as signed by default. */
4116 if (specbits & 1 << (int) RID_UNSIGNED
4117 /* Traditionally, all bitfields are unsigned. */
4118 || (bitfield && flag_traditional
4119 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4120 || (bitfield && ! flag_signed_bitfields
4121 && (explicit_int || defaulted_int || explicit_char
4122 /* A typedef for plain `int' without `signed'
4123 can be controlled just like plain `int'. */
4124 || ! (typedef_decl != 0
4125 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4126 && TREE_CODE (type) != ENUMERAL_TYPE
4127 && !(specbits & 1 << (int) RID_SIGNED)))
4130 type = long_long_unsigned_type_node;
4131 else if (specbits & 1 << (int) RID_LONG)
4132 type = long_unsigned_type_node;
4133 else if (specbits & 1 << (int) RID_SHORT)
4134 type = short_unsigned_type_node;
4135 else if (type == char_type_node)
4136 type = unsigned_char_type_node;
4137 else if (typedef_decl)
4138 type = unsigned_type (type);
4140 type = unsigned_type_node;
4142 else if ((specbits & 1 << (int) RID_SIGNED)
4143 && type == char_type_node)
4144 type = signed_char_type_node;
4146 type = long_long_integer_type_node;
4147 else if (specbits & 1 << (int) RID_LONG)
4148 type = long_integer_type_node;
4149 else if (specbits & 1 << (int) RID_SHORT)
4150 type = short_integer_type_node;
4152 if (specbits & 1 << (int) RID_COMPLEX)
4154 if (pedantic && !flag_isoc99)
4155 pedwarn ("ISO C89 does not support complex types");
4156 /* If we just have "complex", it is equivalent to
4157 "complex double", but if any modifiers at all are specified it is
4158 the complex form of TYPE. E.g, "complex short" is
4159 "complex short int". */
4161 if (defaulted_int && ! longlong
4162 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4163 | (1 << (int) RID_SIGNED)
4164 | (1 << (int) RID_UNSIGNED))))
4167 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4168 type = complex_double_type_node;
4170 else if (type == integer_type_node)
4173 pedwarn ("ISO C does not support complex integer types");
4174 type = complex_integer_type_node;
4176 else if (type == float_type_node)
4177 type = complex_float_type_node;
4178 else if (type == double_type_node)
4179 type = complex_double_type_node;
4180 else if (type == long_double_type_node)
4181 type = complex_long_double_type_node;
4185 pedwarn ("ISO C does not support complex integer types");
4186 type = build_complex_type (type);
4190 /* Figure out the type qualifiers for the declaration. There are
4191 two ways a declaration can become qualified. One is something
4192 like `const int i' where the `const' is explicit. Another is
4193 something like `typedef const int CI; CI i' where the type of the
4194 declaration contains the `const'. */
4195 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4196 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4197 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4198 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4199 if (constp > 1 && ! flag_isoc99)
4200 pedwarn ("duplicate `const'");
4201 if (restrictp > 1 && ! flag_isoc99)
4202 pedwarn ("duplicate `restrict'");
4203 if (volatilep > 1 && ! flag_isoc99)
4204 pedwarn ("duplicate `volatile'");
4205 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4206 type = TYPE_MAIN_VARIANT (type);
4207 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4208 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4209 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4211 /* Warn if two storage classes are given. Default to `auto'. */
4216 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4217 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4218 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4219 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4220 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4222 /* Warn about storage classes that are invalid for certain
4223 kinds of declarations (parameters, typenames, etc.). */
4226 error ("multiple storage classes in declaration of `%s'", name);
4227 else if (funcdef_flag
4229 & ((1 << (int) RID_REGISTER)
4230 | (1 << (int) RID_AUTO)
4231 | (1 << (int) RID_TYPEDEF))))
4233 if (specbits & 1 << (int) RID_AUTO
4234 && (pedantic || current_binding_level == global_binding_level))
4235 pedwarn ("function definition declared `auto'");
4236 if (specbits & 1 << (int) RID_REGISTER)
4237 error ("function definition declared `register'");
4238 if (specbits & 1 << (int) RID_TYPEDEF)
4239 error ("function definition declared `typedef'");
4240 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4241 | (1 << (int) RID_AUTO));
4243 else if (decl_context != NORMAL && nclasses > 0)
4245 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4249 switch (decl_context)
4252 error ("storage class specified for structure field `%s'",
4256 error ("storage class specified for parameter `%s'", name);
4259 error ("storage class specified for typename");
4262 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4263 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4264 | (1 << (int) RID_EXTERN));
4267 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4269 /* `extern' with initialization is invalid if not at top level. */
4270 if (current_binding_level == global_binding_level)
4271 warning ("`%s' initialized and declared `extern'", name);
4273 error ("`%s' has both `extern' and initializer", name);
4275 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4276 && current_binding_level != global_binding_level)
4277 error ("nested function `%s' declared `extern'", name);
4278 else if (current_binding_level == global_binding_level
4279 && specbits & (1 << (int) RID_AUTO))
4280 error ("top-level declaration of `%s' specifies `auto'", name);
4283 /* Now figure out the structure of the declarator proper.
4284 Descend through it, creating more complex types, until we reach
4285 the declared identifier (or NULL_TREE, in an absolute declarator). */
4287 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4289 if (type == error_mark_node)
4291 declarator = TREE_OPERAND (declarator, 0);
4295 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4296 an INDIRECT_REF (for *...),
4297 a CALL_EXPR (for ...(...)),
4298 an identifier (for the name being declared)
4299 or a null pointer (for the place in an absolute declarator
4300 where the name was omitted).
4301 For the last two cases, we have just exited the loop.
4303 At this point, TYPE is the type of elements of an array,
4304 or for a function to return, or for a pointer to point to.
4305 After this sequence of ifs, TYPE is the type of the
4306 array or function or pointer, and DECLARATOR has had its
4307 outermost layer removed. */
4309 if (array_ptr_quals != NULL_TREE || array_parm_static)
4311 /* Only the innermost declarator (making a parameter be of
4312 array type which is converted to pointer type)
4313 may have static or type qualifiers. */
4314 error ("static or type qualifiers in non-parameter array declarator");
4315 array_ptr_quals = NULL_TREE;
4316 array_parm_static = 0;
4319 if (TREE_CODE (declarator) == ARRAY_REF)
4321 register tree itype = NULL_TREE;
4322 register tree size = TREE_OPERAND (declarator, 1);
4323 /* The index is a signed object `sizetype' bits wide. */
4324 tree index_type = signed_type (sizetype);
4326 array_ptr_quals = TREE_TYPE (declarator);
4327 array_parm_static = TREE_STATIC (declarator);
4329 declarator = TREE_OPERAND (declarator, 0);
4331 /* Check for some types that there cannot be arrays of. */
4333 if (VOID_TYPE_P (type))
4335 error ("declaration of `%s' as array of voids", name);
4336 type = error_mark_node;
4339 if (TREE_CODE (type) == FUNCTION_TYPE)
4341 error ("declaration of `%s' as array of functions", name);
4342 type = error_mark_node;
4345 if (size == error_mark_node)
4346 type = error_mark_node;
4348 if (type == error_mark_node)
4351 /* If size was specified, set ITYPE to a range-type for that size.
4352 Otherwise, ITYPE remains null. finish_decl may figure it out
4353 from an initial value. */
4357 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4358 STRIP_TYPE_NOPS (size);
4360 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4361 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4363 error ("size of array `%s' has non-integer type", name);
4364 size = integer_one_node;
4367 if (pedantic && integer_zerop (size))
4368 pedwarn ("ISO C forbids zero-size array `%s'", name);
4370 if (TREE_CODE (size) == INTEGER_CST)
4372 constant_expression_warning (size);
4373 if (tree_int_cst_sgn (size) < 0)
4375 error ("size of array `%s' is negative", name);
4376 size = integer_one_node;
4381 /* Make sure the array size remains visibly nonconstant
4382 even if it is (eg) a const variable with known value. */
4387 if (TREE_CONSTANT (size))
4388 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4391 pedwarn ("ISO C89 forbids variable-size array `%s'",
4396 if (integer_zerop (size))
4398 /* A zero-length array cannot be represented with an
4399 unsigned index type, which is what we'll get with
4400 build_index_type. Create an open-ended range instead. */
4401 itype = build_range_type (sizetype, size, NULL_TREE);
4405 /* Compute the maximum valid index, that is, size - 1.
4406 Do the calculation in index_type, so that if it is
4407 a variable the computations will be done in the
4409 itype = fold (build (MINUS_EXPR, index_type,
4410 convert (index_type, size),
4411 convert (index_type, size_one_node)));
4413 /* If that overflowed, the array is too big.
4414 ??? While a size of INT_MAX+1 technically shouldn't
4415 cause an overflow (because we subtract 1), the overflow
4416 is recorded during the conversion to index_type, before
4417 the subtraction. Handling this case seems like an
4418 unnecessary complication. */
4419 if (TREE_OVERFLOW (itype))
4421 error ("size of array `%s' is too large", name);
4422 type = error_mark_node;
4427 itype = variable_size (itype);
4428 itype = build_index_type (itype);
4431 else if (decl_context == FIELD)
4433 /* ??? Need to check somewhere that this is a structure
4434 and not a union, that this field is last, and that
4435 this structure has at least one other named member. */
4437 if (pedantic && !flag_isoc99 && !in_system_header)
4438 pedwarn ("ISO C89 does not support flexible array members");
4440 /* ISO C99 Flexible array members are effectively identical
4441 to GCC's zero-length array extension. */
4442 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4445 /* If pedantic, complain about arrays of incomplete types. */
4447 if (pedantic && !COMPLETE_TYPE_P (type))
4448 pedwarn ("array type has incomplete element type");
4451 /* We shouldn't have a function type here at all!
4452 Functions aren't allowed as array elements. */
4453 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4454 && (constp || volatilep))
4455 pedwarn ("ANSI C forbids const or volatile function types");
4458 /* Build the array type itself, then merge any constancy or
4459 volatility into the target type. We must do it in this order
4460 to ensure that the TYPE_MAIN_VARIANT field of the array type
4461 is set correctly. */
4463 type = build_array_type (type, itype);
4465 type = c_build_qualified_type (type, type_quals);
4468 C_TYPE_VARIABLE_SIZE (type) = 1;
4470 /* The GCC extension for zero-length arrays differs from
4471 ISO flexible array members in that sizeof yields zero. */
4472 if (size && integer_zerop (size))
4475 TYPE_SIZE (type) = bitsize_zero_node;
4476 TYPE_SIZE_UNIT (type) = size_zero_node;
4478 if (decl_context != PARM
4479 && (array_ptr_quals != NULL_TREE || array_parm_static))
4481 error ("static or type qualifiers in non-parameter array declarator");
4482 array_ptr_quals = NULL_TREE;
4483 array_parm_static = 0;
4486 else if (TREE_CODE (declarator) == CALL_EXPR)
4490 /* Declaring a function type.
4491 Make sure we have a valid type for the function to return. */
4492 if (type == error_mark_node)
4497 /* Warn about some types functions can't return. */
4499 if (TREE_CODE (type) == FUNCTION_TYPE)
4501 error ("`%s' declared as function returning a function", name);
4502 type = integer_type_node;
4504 if (TREE_CODE (type) == ARRAY_TYPE)
4506 error ("`%s' declared as function returning an array", name);
4507 type = integer_type_node;
4510 #ifndef TRADITIONAL_RETURN_FLOAT
4511 /* Traditionally, declaring return type float means double. */
4513 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4514 type = double_type_node;
4515 #endif /* TRADITIONAL_RETURN_FLOAT */
4517 /* Construct the function type and go to the next
4518 inner layer of declarator. */
4520 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4522 /* Say it's a definition
4523 only for the CALL_EXPR
4524 closest to the identifier. */
4525 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4526 /* Type qualifiers before the return type of the function
4527 qualify the return type, not the function type. */
4530 /* Type qualifiers on a function return type are normally
4531 permitted by the standard but have no effect, so give a
4532 warning at -W. Qualifiers on a void return type have
4533 meaning as a GNU extension, and are banned on function
4534 definitions in ISO C. FIXME: strictly we shouldn't
4535 pedwarn for qualified void return types except on function
4536 definitions, but not doing so could lead to the undesirable
4537 state of a "volatile void" function return type not being
4538 warned about, and a use of the function being compiled
4539 with GNU semantics, with no diagnostics under -pedantic. */
4540 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4541 pedwarn ("ISO C forbids qualified void function return type");
4542 else if (extra_warnings
4543 && !(VOID_TYPE_P (type)
4544 && type_quals == TYPE_QUAL_VOLATILE))
4545 warning ("type qualifiers ignored on function return type");
4547 type = c_build_qualified_type (type, type_quals);
4549 type_quals = TYPE_UNQUALIFIED;
4551 type = build_function_type (type, arg_types);
4552 declarator = TREE_OPERAND (declarator, 0);
4554 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4555 the formal parameter list of this FUNCTION_TYPE to point to
4556 the FUNCTION_TYPE node itself. */
4561 for (link = last_function_parm_tags;
4563 link = TREE_CHAIN (link))
4564 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4567 else if (TREE_CODE (declarator) == INDIRECT_REF)
4569 /* Merge any constancy or volatility into the target type
4572 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4574 pedwarn ("ISO C forbids qualified function types");
4576 type = c_build_qualified_type (type, type_quals);
4577 type_quals = TYPE_UNQUALIFIED;
4580 type = build_pointer_type (type);
4582 /* Process a list of type modifier keywords
4583 (such as const or volatile) that were given inside the `*'. */
4585 if (TREE_TYPE (declarator))
4587 register tree typemodlist;
4593 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4594 typemodlist = TREE_CHAIN (typemodlist))
4596 tree qualifier = TREE_VALUE (typemodlist);
4598 if (C_IS_RESERVED_WORD (qualifier))
4600 if (C_RID_CODE (qualifier) == RID_CONST)
4602 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4604 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4614 error ("invalid type modifier within pointer declarator");
4615 if (constp > 1 && ! flag_isoc99)
4616 pedwarn ("duplicate `const'");
4617 if (volatilep > 1 && ! flag_isoc99)
4618 pedwarn ("duplicate `volatile'");
4619 if (restrictp > 1 && ! flag_isoc99)
4620 pedwarn ("duplicate `restrict'");
4622 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4623 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4624 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4627 declarator = TREE_OPERAND (declarator, 0);
4634 /* Now TYPE has the actual type. */
4636 /* Did array size calculations overflow? */
4638 if (TREE_CODE (type) == ARRAY_TYPE
4639 && COMPLETE_TYPE_P (type)
4640 && TREE_OVERFLOW (TYPE_SIZE (type)))
4642 error ("size of array `%s' is too large", name);
4643 /* If we proceed with the array type as it is, we'll eventully
4644 crash in tree_low_cst(). */
4645 type = error_mark_node;
4648 /* If this is declaring a typedef name, return a TYPE_DECL. */
4650 if (specbits & (1 << (int) RID_TYPEDEF))
4653 /* Note that the grammar rejects storage classes
4654 in typenames, fields or parameters */
4655 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4657 pedwarn ("ISO C forbids qualified function types");
4659 type = c_build_qualified_type (type, type_quals);
4660 decl = build_decl (TYPE_DECL, declarator, type);
4661 if ((specbits & (1 << (int) RID_SIGNED))
4662 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4663 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4667 /* Detect the case of an array type of unspecified size
4668 which came, as such, direct from a typedef name.
4669 We must copy the type, so that each identifier gets
4670 a distinct type, so that each identifier's size can be
4671 controlled separately by its own initializer. */
4673 if (type != 0 && typedef_type != 0
4674 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4675 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4677 type = build_array_type (TREE_TYPE (type), 0);
4679 C_TYPE_VARIABLE_SIZE (type) = 1;
4682 /* If this is a type name (such as, in a cast or sizeof),
4683 compute the type and return it now. */
4685 if (decl_context == TYPENAME)
4687 /* Note that the grammar rejects storage classes
4688 in typenames, fields or parameters */
4689 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4691 pedwarn ("ISO C forbids const or volatile function types");
4693 type = c_build_qualified_type (type, type_quals);
4697 /* Aside from typedefs and type names (handle above),
4698 `void' at top level (not within pointer)
4699 is allowed only in public variables.
4700 We don't complain about parms either, but that is because
4701 a better error message can be made later. */
4703 if (VOID_TYPE_P (type) && decl_context != PARM
4704 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4705 && ((specbits & (1 << (int) RID_EXTERN))
4706 || (current_binding_level == global_binding_level
4708 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4710 error ("variable or field `%s' declared void", name);
4711 type = integer_type_node;
4714 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4715 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4720 if (decl_context == PARM)
4722 tree type_as_written;
4725 /* A parameter declared as an array of T is really a pointer to T.
4726 One declared as a function is really a pointer to a function. */
4728 if (TREE_CODE (type) == ARRAY_TYPE)
4730 /* Transfer const-ness of array into that of type pointed to. */
4731 type = TREE_TYPE (type);
4733 type = c_build_qualified_type (type, type_quals);
4734 type = build_pointer_type (type);
4735 type_quals = TYPE_UNQUALIFIED;
4736 if (array_ptr_quals)
4738 tree new_ptr_quals, new_ptr_attrs;
4740 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4741 /* We don't yet implement attributes in this context. */
4742 if (new_ptr_attrs != NULL_TREE)
4743 warning ("attributes in parameter array declarator ignored");
4748 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4750 tree qualifier = TREE_VALUE (new_ptr_quals);
4752 if (C_IS_RESERVED_WORD (qualifier))
4754 if (C_RID_CODE (qualifier) == RID_CONST)
4756 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4758 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4768 error ("invalid type modifier within array declarator");
4770 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4771 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4772 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4776 else if (TREE_CODE (type) == FUNCTION_TYPE)
4778 if (pedantic && type_quals)
4779 pedwarn ("ISO C forbids qualified function types");
4781 type = c_build_qualified_type (type, type_quals);
4782 type = build_pointer_type (type);
4783 type_quals = TYPE_UNQUALIFIED;
4785 else if (type_quals)
4786 type = c_build_qualified_type (type, type_quals);
4788 type_as_written = type;
4790 decl = build_decl (PARM_DECL, declarator, type);
4792 C_DECL_VARIABLE_SIZE (decl) = 1;
4794 /* Compute the type actually passed in the parmlist,
4795 for the case where there is no prototype.
4796 (For example, shorts and chars are passed as ints.)
4797 When there is a prototype, this is overridden later. */
4799 if (type == error_mark_node)
4800 promoted_type = type;
4803 promoted_type = simple_type_promotes_to (type);
4804 if (! promoted_type)
4805 promoted_type = type;
4808 DECL_ARG_TYPE (decl) = promoted_type;
4809 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4811 else if (decl_context == FIELD)
4813 /* Structure field. It may not be a function. */
4815 if (TREE_CODE (type) == FUNCTION_TYPE)
4817 error ("field `%s' declared as a function", name);
4818 type = build_pointer_type (type);
4820 else if (TREE_CODE (type) != ERROR_MARK
4821 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4823 error ("field `%s' has incomplete type", name);
4824 type = error_mark_node;
4826 /* Move type qualifiers down to element of an array. */
4827 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4829 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4831 TYPE_DOMAIN (type));
4833 /* Leave the field const or volatile as well. */
4834 type_quals = TYPE_UNQUALIFIED;
4837 decl = build_decl (FIELD_DECL, declarator, type);
4838 DECL_NONADDRESSABLE_P (decl) = bitfield;
4841 C_DECL_VARIABLE_SIZE (decl) = 1;
4843 else if (TREE_CODE (type) == FUNCTION_TYPE)
4845 /* Every function declaration is "external"
4846 except for those which are inside a function body
4847 in which `auto' is used.
4848 That is a case not specified by ANSI C,
4849 and we use it for forward declarations for nested functions. */
4850 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4851 || current_binding_level == global_binding_level);
4853 if (specbits & (1 << (int) RID_AUTO)
4854 && (pedantic || current_binding_level == global_binding_level))
4855 pedwarn ("invalid storage class for function `%s'", name);
4856 if (specbits & (1 << (int) RID_REGISTER))
4857 error ("invalid storage class for function `%s'", name);
4858 /* Function declaration not at top level.
4859 Storage classes other than `extern' are not allowed
4860 and `extern' makes no difference. */
4861 if (current_binding_level != global_binding_level
4862 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4864 pedwarn ("invalid storage class for function `%s'", name);
4866 decl = build_decl (FUNCTION_DECL, declarator, type);
4867 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4869 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4870 pedwarn ("ISO C forbids qualified function types");
4872 /* GNU C interprets a `volatile void' return type to indicate
4873 that the function does not return. */
4874 if ((type_quals & TYPE_QUAL_VOLATILE)
4875 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4876 warning ("`noreturn' function returns non-void value");
4879 DECL_EXTERNAL (decl) = 1;
4880 /* Record absence of global scope for `static' or `auto'. */
4882 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4884 /* Record presence of `inline', if it is reasonable. */
4887 if (MAIN_NAME_P (declarator))
4888 warning ("cannot inline function `main'");
4890 /* Assume that otherwise the function can be inlined. */
4891 DECL_INLINE (decl) = 1;
4893 if (specbits & (1 << (int) RID_EXTERN))
4894 current_extern_inline = 1;
4899 /* It's a variable. */
4900 /* An uninitialized decl with `extern' is a reference. */
4901 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4903 /* Move type qualifiers down to element of an array. */
4904 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4906 int saved_align = TYPE_ALIGN(type);
4907 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4909 TYPE_DOMAIN (type));
4910 TYPE_ALIGN (type) = saved_align;
4911 #if 0 /* Leave the variable const or volatile as well. */
4912 type_quals = TYPE_UNQUALIFIED;
4915 else if (type_quals)
4916 type = c_build_qualified_type (type, type_quals);
4918 decl = build_decl (VAR_DECL, declarator, type);
4920 C_DECL_VARIABLE_SIZE (decl) = 1;
4923 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4925 DECL_EXTERNAL (decl) = extern_ref;
4926 /* At top level, the presence of a `static' or `register' storage
4927 class specifier, or the absence of all storage class specifiers
4928 makes this declaration a definition (perhaps tentative). Also,
4929 the absence of both `static' and `register' makes it public. */
4930 if (current_binding_level == global_binding_level)
4934 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4935 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4937 /* Not at top level, only `static' makes a static definition. */
4940 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4941 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4945 /* Record `register' declaration for warnings on &
4946 and in case doing stupid register allocation. */
4948 if (specbits & (1 << (int) RID_REGISTER))
4949 DECL_REGISTER (decl) = 1;
4951 /* Record constancy and volatility. */
4952 c_apply_type_quals_to_decl (type_quals, decl);
4954 /* If a type has volatile components, it should be stored in memory.
4955 Otherwise, the fact that those components are volatile
4956 will be ignored, and would even crash the compiler. */
4957 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4958 mark_addressable (decl);
4964 /* Decode the parameter-list info for a function type or function definition.
4965 The argument is the value returned by `get_parm_info' (or made in parse.y
4966 if there is an identifier list instead of a parameter decl list).
4967 These two functions are separate because when a function returns
4968 or receives functions then each is called multiple times but the order
4969 of calls is different. The last call to `grokparms' is always the one
4970 that contains the formal parameter names of a function definition.
4972 Store in `last_function_parms' a chain of the decls of parms.
4973 Also store in `last_function_parm_tags' a chain of the struct, union,
4974 and enum tags declared among the parms.
4976 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4978 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4979 a mere declaration. A nonempty identifier-list gets an error message
4980 when FUNCDEF_FLAG is zero. */
4983 grokparms (parms_info, funcdef_flag)
4987 tree first_parm = TREE_CHAIN (parms_info);
4989 last_function_parms = TREE_PURPOSE (parms_info);
4990 last_function_parm_tags = TREE_VALUE (parms_info);
4992 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4993 && !in_system_header)
4994 warning ("function declaration isn't a prototype");
4997 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5000 pedwarn ("parameter names (without types) in function declaration");
5002 last_function_parms = first_parm;
5009 /* We no longer test FUNCDEF_FLAG.
5010 If the arg types are incomplete in a declaration,
5011 they must include undefined tags.
5012 These tags can never be defined in the scope of the declaration,
5013 so the types can never be completed,
5014 and no call can be compiled successfully. */
5016 /* In a fcn definition, arg types must be complete. */
5019 for (parm = last_function_parms, typelt = first_parm;
5021 parm = TREE_CHAIN (parm))
5022 /* Skip over any enumeration constants declared here. */
5023 if (TREE_CODE (parm) == PARM_DECL)
5025 /* Barf if the parameter itself has an incomplete type. */
5026 tree type = TREE_VALUE (typelt);
5027 if (type == error_mark_node)
5029 if (!COMPLETE_TYPE_P (type))
5031 if (funcdef_flag && DECL_NAME (parm) != 0)
5032 error ("parameter `%s' has incomplete type",
5033 IDENTIFIER_POINTER (DECL_NAME (parm)));
5035 warning ("parameter has incomplete type");
5038 TREE_VALUE (typelt) = error_mark_node;
5039 TREE_TYPE (parm) = error_mark_node;
5043 /* This has been replaced by parm_tags_warning, which
5044 uses a more accurate criterion for what to warn
5048 /* Now warn if is a pointer to an incomplete type. */
5049 while (TREE_CODE (type) == POINTER_TYPE
5050 || TREE_CODE (type) == REFERENCE_TYPE)
5051 type = TREE_TYPE (type);
5052 type = TYPE_MAIN_VARIANT (type);
5053 if (!COMPLETE_TYPE_P (type))
5055 if (DECL_NAME (parm) != 0)
5056 warning ("parameter `%s' points to incomplete type",
5057 IDENTIFIER_POINTER (DECL_NAME (parm)));
5059 warning ("parameter points to incomplete type");
5063 typelt = TREE_CHAIN (typelt);
5070 /* Return a tree_list node with info on a parameter list just parsed.
5071 The TREE_PURPOSE is a chain of decls of those parms.
5072 The TREE_VALUE is a list of structure, union and enum tags defined.
5073 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5074 This tree_list node is later fed to `grokparms'.
5076 VOID_AT_END nonzero means append `void' to the end of the type-list.
5077 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5080 get_parm_info (void_at_end)
5083 register tree decl, t;
5084 register tree types = 0;
5086 tree tags = gettags ();
5087 tree parms = getdecls ();
5089 tree order = current_binding_level->parm_order;
5091 /* Just `void' (and no ellipsis) is special. There are really no parms.
5092 But if the `void' is qualified (by `const' or `volatile') or has a
5093 storage class specifier (`register'), then the behavior is undefined;
5094 by not counting it as the special case of `void' we will cause an
5095 error later. Typedefs for `void' are OK (see DR#157). */
5096 if (void_at_end && parms != 0
5097 && TREE_CHAIN (parms) == 0
5098 && VOID_TYPE_P (TREE_TYPE (parms))
5099 && ! TREE_THIS_VOLATILE (parms)
5100 && ! TREE_READONLY (parms)
5101 && ! DECL_REGISTER (parms)
5102 && DECL_NAME (parms) == 0)
5105 storedecls (NULL_TREE);
5106 return tree_cons (NULL_TREE, NULL_TREE,
5107 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5110 /* Extract enumerator values and other non-parms declared with the parms.
5111 Likewise any forward parm decls that didn't have real parm decls. */
5112 for (decl = parms; decl;)
5114 tree next = TREE_CHAIN (decl);
5116 if (TREE_CODE (decl) != PARM_DECL)
5118 TREE_CHAIN (decl) = new_parms;
5121 else if (TREE_ASM_WRITTEN (decl))
5123 error_with_decl (decl,
5124 "parameter `%s' has just a forward declaration");
5125 TREE_CHAIN (decl) = new_parms;
5131 /* Put the parm decls back in the order they were in in the parm list. */
5132 for (t = order; t; t = TREE_CHAIN (t))
5135 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5137 TREE_CHAIN (TREE_VALUE (t)) = 0;
5140 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5143 /* Store the parmlist in the binding level since the old one
5144 is no longer a valid list. (We have changed the chain pointers.) */
5145 storedecls (new_parms);
5147 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5148 /* There may also be declarations for enumerators if an enumeration
5149 type is declared among the parms. Ignore them here. */
5150 if (TREE_CODE (decl) == PARM_DECL)
5152 /* Since there is a prototype,
5153 args are passed in their declared types. */
5154 tree type = TREE_TYPE (decl);
5155 DECL_ARG_TYPE (decl) = type;
5156 if (PROMOTE_PROTOTYPES
5157 && INTEGRAL_TYPE_P (type)
5158 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5159 DECL_ARG_TYPE (decl) = integer_type_node;
5161 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5162 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5163 && DECL_NAME (decl) == 0)
5165 error ("`void' in parameter list must be the entire list");
5171 return tree_cons (new_parms, tags,
5172 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5174 return tree_cons (new_parms, tags, nreverse (types));
5177 /* At end of parameter list, warn about any struct, union or enum tags
5178 defined within. Do so because these types cannot ever become complete. */
5181 parmlist_tags_warning ()
5186 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5188 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5189 /* An anonymous union parm type is meaningful as a GNU extension.
5190 So don't warn for that. */
5191 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5193 if (TREE_PURPOSE (elt) != 0)
5194 warning ("`%s %s' declared inside parameter list",
5195 (code == RECORD_TYPE ? "struct"
5196 : code == UNION_TYPE ? "union"
5198 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5201 /* For translation these need to be seperate warnings */
5202 if (code == RECORD_TYPE)
5203 warning ("anonymous struct declared inside parameter list");
5204 else if (code == UNION_TYPE)
5205 warning ("anonymous union declared inside parameter list");
5207 warning ("anonymous enum declared inside parameter list");
5211 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5217 /* Get the struct, enum or union (CODE says which) with tag NAME.
5218 Define the tag as a forward-reference if it is not defined. */
5221 xref_tag (code, name)
5222 enum tree_code code;
5225 /* If a cross reference is requested, look up the type
5226 already defined for this tag and return it. */
5228 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5229 /* Even if this is the wrong type of tag, return what we found.
5230 There will be an error message anyway, from pending_xref_error.
5231 If we create an empty xref just for an invalid use of the type,
5232 the main result is to create lots of superfluous error messages. */
5236 /* If no such tag is yet defined, create a forward-reference node
5237 and record it as the "definition".
5238 When a real declaration of this type is found,
5239 the forward-reference will be altered into a real type. */
5241 ref = make_node (code);
5242 if (code == ENUMERAL_TYPE)
5244 /* Give the type a default layout like unsigned int
5245 to avoid crashing if it does not get defined. */
5246 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5247 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5248 TYPE_USER_ALIGN (ref) = 0;
5249 TREE_UNSIGNED (ref) = 1;
5250 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5251 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5252 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5255 pushtag (name, ref);
5260 /* Make sure that the tag NAME is defined *in the current binding level*
5261 at least as a forward reference.
5262 CODE says which kind of tag NAME ought to be. */
5265 start_struct (code, name)
5266 enum tree_code code;
5269 /* If there is already a tag defined at this binding level
5270 (as a forward reference), just return it. */
5272 register tree ref = 0;
5275 ref = lookup_tag (code, name, current_binding_level, 1);
5276 if (ref && TREE_CODE (ref) == code)
5278 C_TYPE_BEING_DEFINED (ref) = 1;
5279 TYPE_PACKED (ref) = flag_pack_struct;
5280 if (TYPE_FIELDS (ref))
5281 error ("redefinition of `%s %s'",
5282 code == UNION_TYPE ? "union" : "struct",
5283 IDENTIFIER_POINTER (name));
5288 /* Otherwise create a forward-reference just so the tag is in scope. */
5290 ref = make_node (code);
5291 pushtag (name, ref);
5292 C_TYPE_BEING_DEFINED (ref) = 1;
5293 TYPE_PACKED (ref) = flag_pack_struct;
5297 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5298 of a structure component, returning a FIELD_DECL node.
5299 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5301 This is done during the parsing of the struct declaration.
5302 The FIELD_DECL nodes are chained together and the lot of them
5303 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5306 grokfield (filename, line, declarator, declspecs, width)
5307 const char *filename ATTRIBUTE_UNUSED;
5308 int line ATTRIBUTE_UNUSED;
5309 tree declarator, declspecs, width;
5313 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5315 finish_decl (value, NULL_TREE, NULL_TREE);
5316 DECL_INITIAL (value) = width;
5318 maybe_objc_check_decl (value);
5322 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5323 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5324 ATTRIBUTES are attributes to be applied to the structure. */
5327 finish_struct (t, fieldlist, attributes)
5333 int toplevel = global_binding_level == current_binding_level;
5334 int saw_named_field;
5336 /* If this type was previously laid out as a forward reference,
5337 make sure we lay it out again. */
5341 decl_attributes (t, attributes, NULL_TREE);
5343 /* Nameless union parm types are useful as GCC extension. */
5344 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5345 /* Otherwise, warn about any struct or union def. in parmlist. */
5346 if (in_parm_level_p ())
5349 pedwarn ("%s defined inside parms",
5350 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5351 else if (! flag_traditional)
5352 warning ("%s defined inside parms",
5353 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5358 for (x = fieldlist; x; x = TREE_CHAIN (x))
5359 if (DECL_NAME (x) != 0)
5363 pedwarn ("%s has no %s",
5364 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5365 fieldlist ? _("named members") : _("members"));
5368 /* Install struct as DECL_CONTEXT of each field decl.
5369 Also process specified field sizes,m which is found in the DECL_INITIAL.
5370 Store 0 there, except for ": 0" fields (so we can find them
5371 and delete them, below). */
5373 saw_named_field = 0;
5374 for (x = fieldlist; x; x = TREE_CHAIN (x))
5376 DECL_CONTEXT (x) = t;
5377 DECL_PACKED (x) |= TYPE_PACKED (t);
5379 /* If any field is const, the structure type is pseudo-const. */
5380 if (TREE_READONLY (x))
5381 C_TYPE_FIELDS_READONLY (t) = 1;
5384 /* A field that is pseudo-const makes the structure likewise. */
5385 tree t1 = TREE_TYPE (x);
5386 while (TREE_CODE (t1) == ARRAY_TYPE)
5387 t1 = TREE_TYPE (t1);
5388 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5389 && C_TYPE_FIELDS_READONLY (t1))
5390 C_TYPE_FIELDS_READONLY (t) = 1;
5393 /* Any field that is volatile means variables of this type must be
5394 treated in some ways as volatile. */
5395 if (TREE_THIS_VOLATILE (x))
5396 C_TYPE_FIELDS_VOLATILE (t) = 1;
5398 /* Any field of nominal variable size implies structure is too. */
5399 if (C_DECL_VARIABLE_SIZE (x))
5400 C_TYPE_VARIABLE_SIZE (t) = 1;
5402 /* Detect invalid nested redefinition. */
5403 if (TREE_TYPE (x) == t)
5404 error ("nested redefinition of `%s'",
5405 IDENTIFIER_POINTER (TYPE_NAME (t)));
5407 /* Detect invalid bit-field size. */
5408 if (DECL_INITIAL (x))
5409 STRIP_NOPS (DECL_INITIAL (x));
5410 if (DECL_INITIAL (x))
5412 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5413 constant_expression_warning (DECL_INITIAL (x));
5417 "bit-field `%s' width not an integer constant");
5418 DECL_INITIAL (x) = NULL;
5422 /* Detect invalid bit-field type. */
5423 if (DECL_INITIAL (x)
5424 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5425 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5426 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5428 error_with_decl (x, "bit-field `%s' has invalid type");
5429 DECL_INITIAL (x) = NULL;
5432 if (DECL_INITIAL (x) && pedantic
5433 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5434 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5435 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5436 /* Accept an enum that's equivalent to int or unsigned int. */
5437 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5438 && (TYPE_PRECISION (TREE_TYPE (x))
5439 == TYPE_PRECISION (integer_type_node))))
5440 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5442 /* Detect and ignore out of range field width and process valid
5444 if (DECL_INITIAL (x))
5447 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5448 max_width = CHAR_TYPE_SIZE;
5450 max_width = TYPE_PRECISION (TREE_TYPE (x));
5451 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5452 error_with_decl (x, "negative width in bit-field `%s'");
5453 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5454 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5455 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5456 error_with_decl (x, "zero width for bit-field `%s'");
5459 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5460 unsigned HOST_WIDE_INT width
5461 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5463 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5464 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5465 TREE_UNSIGNED (TREE_TYPE (x)))
5467 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5468 TREE_UNSIGNED (TREE_TYPE (x))))))
5469 warning_with_decl (x,
5470 "`%s' is narrower than values of its type");
5472 DECL_SIZE (x) = bitsize_int (width);
5473 DECL_BIT_FIELD (x) = 1;
5474 SET_DECL_C_BIT_FIELD (x);
5478 /* field size 0 => force desired amount of alignment. */
5479 #ifdef EMPTY_FIELD_BOUNDARY
5480 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5482 #ifdef PCC_BITFIELD_TYPE_MATTERS
5483 if (PCC_BITFIELD_TYPE_MATTERS)
5485 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5486 TYPE_ALIGN (TREE_TYPE (x)));
5487 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5494 else if (TREE_TYPE (x) != error_mark_node)
5496 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5497 : TYPE_ALIGN (TREE_TYPE (x)));
5499 /* Non-bit-fields are aligned for their type, except packed
5500 fields which require only BITS_PER_UNIT alignment. */
5501 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5502 if (! DECL_PACKED (x))
5503 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5506 DECL_INITIAL (x) = 0;
5508 /* Detect flexible array member in an invalid context. */
5509 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5510 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5511 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5512 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5514 if (TREE_CODE (t) == UNION_TYPE)
5515 error_with_decl (x, "flexible array member in union");
5516 else if (TREE_CHAIN (x) != NULL_TREE)
5517 error_with_decl (x, "flexible array member not at end of struct");
5518 else if (! saw_named_field)
5519 error_with_decl (x, "flexible array member in otherwise empty struct");
5522 saw_named_field = 1;
5525 /* Delete all duplicate fields from the fieldlist */
5526 for (x = fieldlist; x && TREE_CHAIN (x);)
5527 /* Anonymous fields aren't duplicates. */
5528 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5532 register tree y = fieldlist;
5536 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5542 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5544 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5545 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5551 /* Now we have the nearly final fieldlist. Record it,
5552 then lay out the structure or union (including the fields). */
5554 TYPE_FIELDS (t) = fieldlist;
5558 /* Delete all zero-width bit-fields from the fieldlist */
5560 tree *fieldlistp = &fieldlist;
5562 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5563 *fieldlistp = TREE_CHAIN (*fieldlistp);
5565 fieldlistp = &TREE_CHAIN (*fieldlistp);
5568 /* Now we have the truly final field list.
5569 Store it in this type and in the variants. */
5571 TYPE_FIELDS (t) = fieldlist;
5573 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5575 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5576 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5577 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5578 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5581 /* If this was supposed to be a transparent union, but we can't
5582 make it one, warn and turn off the flag. */
5583 if (TREE_CODE (t) == UNION_TYPE
5584 && TYPE_TRANSPARENT_UNION (t)
5585 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5587 TYPE_TRANSPARENT_UNION (t) = 0;
5588 warning ("union cannot be made transparent");
5591 /* If this structure or union completes the type of any previous
5592 variable declaration, lay it out and output its rtl. */
5594 if (current_binding_level->n_incomplete != 0)
5597 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5599 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5600 && TREE_CODE (decl) != TYPE_DECL)
5602 layout_decl (decl, 0);
5603 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5604 maybe_objc_check_decl (decl);
5605 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5608 --current_binding_level->n_incomplete;
5610 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5611 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5613 tree element = TREE_TYPE (decl);
5614 while (TREE_CODE (element) == ARRAY_TYPE)
5615 element = TREE_TYPE (element);
5617 layout_array_type (TREE_TYPE (decl));
5622 /* Finish debugging output for this type. */
5623 rest_of_type_compilation (t, toplevel);
5628 /* Lay out the type T, and its element type, and so on. */
5631 layout_array_type (t)
5634 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5635 layout_array_type (TREE_TYPE (t));
5639 /* Begin compiling the definition of an enumeration type.
5640 NAME is its name (or null if anonymous).
5641 Returns the type object, as yet incomplete.
5642 Also records info about it so that build_enumerator
5643 may be used to declare the individual values as they are read. */
5649 register tree enumtype = 0;
5651 /* If this is the real definition for a previous forward reference,
5652 fill in the contents in the same object that used to be the
5653 forward reference. */
5656 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5658 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5660 enumtype = make_node (ENUMERAL_TYPE);
5661 pushtag (name, enumtype);
5664 C_TYPE_BEING_DEFINED (enumtype) = 1;
5666 if (TYPE_VALUES (enumtype) != 0)
5668 /* This enum is a named one that has been declared already. */
5669 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5671 /* Completely replace its old definition.
5672 The old enumerators remain defined, however. */
5673 TYPE_VALUES (enumtype) = 0;
5676 enum_next_value = integer_zero_node;
5679 if (flag_short_enums)
5680 TYPE_PACKED (enumtype) = 1;
5685 /* After processing and defining all the values of an enumeration type,
5686 install their decls in the enumeration type and finish it off.
5687 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5688 and ATTRIBUTES are the specified attributes.
5689 Returns ENUMTYPE. */
5692 finish_enum (enumtype, values, attributes)
5697 register tree pair, tem;
5698 tree minnode = 0, maxnode = 0, enum_value_type;
5699 int precision, unsign;
5700 int toplevel = (global_binding_level == current_binding_level);
5702 if (in_parm_level_p ())
5703 warning ("enum defined inside parms");
5705 decl_attributes (enumtype, attributes, NULL_TREE);
5707 /* Calculate the maximum value of any enumerator in this type. */
5709 if (values == error_mark_node)
5710 minnode = maxnode = integer_zero_node;
5713 minnode = maxnode = TREE_VALUE (values);
5714 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5716 tree value = TREE_VALUE (pair);
5717 if (tree_int_cst_lt (maxnode, value))
5719 if (tree_int_cst_lt (value, minnode))
5724 /* Construct the final type of this enumeration. It is the same
5725 as one of the integral types - the narrowest one that fits, except
5726 that normally we only go as narrow as int - and signed iff any of
5727 the values are negative. */
5728 unsign = (tree_int_cst_sgn (minnode) >= 0);
5729 precision = MAX (min_precision (minnode, unsign),
5730 min_precision (maxnode, unsign));
5731 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5733 tree narrowest = type_for_size (precision, unsign);
5736 warning ("enumeration values exceed range of largest integer");
5737 narrowest = long_long_integer_type_node;
5740 precision = TYPE_PRECISION (narrowest);
5743 precision = TYPE_PRECISION (integer_type_node);
5745 if (precision == TYPE_PRECISION (integer_type_node))
5746 enum_value_type = type_for_size (precision, 0);
5748 enum_value_type = enumtype;
5750 TYPE_MIN_VALUE (enumtype) = minnode;
5751 TYPE_MAX_VALUE (enumtype) = maxnode;
5752 TYPE_PRECISION (enumtype) = precision;
5753 TREE_UNSIGNED (enumtype) = unsign;
5754 TYPE_SIZE (enumtype) = 0;
5755 layout_type (enumtype);
5757 if (values != error_mark_node)
5759 /* Change the type of the enumerators to be the enum type. We
5760 need to do this irrespective of the size of the enum, for
5761 proper type checking. Replace the DECL_INITIALs of the
5762 enumerators, and the value slots of the list, with copies
5763 that have the enum type; they cannot be modified in place
5764 because they may be shared (e.g. integer_zero_node) Finally,
5765 change the purpose slots to point to the names of the decls. */
5766 for (pair = values; pair; pair = TREE_CHAIN (pair))
5768 tree enu = TREE_PURPOSE (pair);
5770 TREE_TYPE (enu) = enumtype;
5771 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5772 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5773 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5774 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5775 DECL_MODE (enu) = TYPE_MODE (enumtype);
5777 /* The ISO C Standard mandates enumerators to have type int,
5778 even though the underlying type of an enum type is
5779 unspecified. Here we convert any enumerators that fit in
5780 an int to type int, to avoid promotions to unsigned types
5781 when comparing integers with enumerators that fit in the
5782 int range. When -pedantic is given, build_enumerator()
5783 would have already taken care of those that don't fit. */
5784 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5785 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5787 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5789 TREE_PURPOSE (pair) = DECL_NAME (enu);
5790 TREE_VALUE (pair) = DECL_INITIAL (enu);
5793 TYPE_VALUES (enumtype) = values;
5796 /* Fix up all variant types of this enum type. */
5797 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5799 if (tem == enumtype)
5801 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5802 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5803 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5804 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5805 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5806 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5807 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5808 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5809 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5810 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5813 /* Finish debugging output for this type. */
5814 rest_of_type_compilation (enumtype, toplevel);
5819 /* Build and install a CONST_DECL for one value of the
5820 current enumeration type (one that was begun with start_enum).
5821 Return a tree-list containing the CONST_DECL and its value.
5822 Assignment of sequential values by default is handled here. */
5825 build_enumerator (name, value)
5828 register tree decl, type;
5830 /* Validate and default VALUE. */
5832 /* Remove no-op casts from the value. */
5834 STRIP_TYPE_NOPS (value);
5838 if (TREE_CODE (value) == INTEGER_CST)
5840 value = default_conversion (value);
5841 constant_expression_warning (value);
5845 error ("enumerator value for `%s' not integer constant",
5846 IDENTIFIER_POINTER (name));
5851 /* Default based on previous value. */
5852 /* It should no longer be possible to have NON_LVALUE_EXPR
5856 value = enum_next_value;
5858 error ("overflow in enumeration values");
5861 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5863 pedwarn ("ISO C restricts enumerator values to range of `int'");
5864 value = convert (integer_type_node, value);
5867 /* Set basis for default for next value. */
5868 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5869 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5871 /* Now create a declaration for the enum value name. */
5873 type = TREE_TYPE (value);
5874 type = type_for_size (MAX (TYPE_PRECISION (type),
5875 TYPE_PRECISION (integer_type_node)),
5877 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5878 && TREE_UNSIGNED (type)));
5880 decl = build_decl (CONST_DECL, name, type);
5881 DECL_INITIAL (decl) = convert (type, value);
5884 return tree_cons (decl, value, NULL_TREE);
5888 /* Create the FUNCTION_DECL for a function definition.
5889 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5890 the declaration; they describe the function's name and the type it returns,
5891 but twisted together in a fashion that parallels the syntax of C.
5893 This function creates a binding context for the function body
5894 as well as setting up the FUNCTION_DECL in current_function_decl.
5896 Returns 1 on success. If the DECLARATOR is not suitable for a function
5897 (it defines a datum instead), we return 0, which tells
5898 yyparse to report a parse error. */
5901 start_function (declspecs, declarator, prefix_attributes, attributes)
5902 tree declarator, declspecs, prefix_attributes, attributes;
5904 tree decl1, old_decl;
5906 int old_immediate_size_expand = immediate_size_expand;
5908 current_function_returns_value = 0; /* Assume, until we see it does. */
5909 current_function_returns_null = 0;
5910 warn_about_return_type = 0;
5911 current_extern_inline = 0;
5912 c_function_varargs = 0;
5914 shadowed_labels = 0;
5916 /* Don't expand any sizes in the return type of the function. */
5917 immediate_size_expand = 0;
5919 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5921 /* If the declarator is not suitable for a function definition,
5922 cause a syntax error. */
5925 immediate_size_expand = old_immediate_size_expand;
5929 decl_attributes (decl1, prefix_attributes, attributes);
5931 announce_function (decl1);
5933 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5935 error ("return type is an incomplete type");
5936 /* Make it return void instead. */
5938 = build_function_type (void_type_node,
5939 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5942 if (warn_about_return_type)
5943 pedwarn_c99 ("return type defaults to `int'");
5945 /* Save the parm names or decls from this function's declarator
5946 where store_parm_decls will find them. */
5947 current_function_parms = last_function_parms;
5948 current_function_parm_tags = last_function_parm_tags;
5950 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5951 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5952 DECL_INITIAL (decl1) = error_mark_node;
5954 /* If this definition isn't a prototype and we had a prototype declaration
5955 before, copy the arg type info from that prototype.
5956 But not if what we had before was a builtin function. */
5957 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5958 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5959 && !DECL_BUILT_IN (old_decl)
5960 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5961 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5962 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5964 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5965 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5966 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5969 /* If there is no explicit declaration, look for any out-of-scope implicit
5972 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5974 /* Optionally warn of old-fashioned def with no previous prototype. */
5975 if (warn_strict_prototypes
5976 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5978 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5979 || (DECL_BUILT_IN (old_decl)
5980 && ! C_DECL_ANTICIPATED (old_decl)))))
5981 warning ("function declaration isn't a prototype");
5982 /* Optionally warn of any global def with no previous prototype. */
5983 else if (warn_missing_prototypes
5984 && TREE_PUBLIC (decl1)
5986 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5987 || (DECL_BUILT_IN (old_decl)
5988 && ! C_DECL_ANTICIPATED (old_decl))))
5989 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5990 warning_with_decl (decl1, "no previous prototype for `%s'");
5991 /* Optionally warn of any def with no previous prototype
5992 if the function has already been used. */
5993 else if (warn_missing_prototypes
5994 && old_decl != 0 && TREE_USED (old_decl)
5995 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5996 warning_with_decl (decl1,
5997 "`%s' was used with no prototype before its definition");
5998 /* Optionally warn of any global def with no previous declaration. */
5999 else if (warn_missing_declarations
6000 && TREE_PUBLIC (decl1)
6002 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6003 warning_with_decl (decl1, "no previous declaration for `%s'");
6004 /* Optionally warn of any def with no previous declaration
6005 if the function has already been used. */
6006 else if (warn_missing_declarations
6007 && old_decl != 0 && TREE_USED (old_decl)
6008 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6009 warning_with_decl (decl1,
6010 "`%s' was used with no declaration before its definition");
6012 /* This is a definition, not a reference.
6013 So normally clear DECL_EXTERNAL.
6014 However, `extern inline' acts like a declaration
6015 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6016 DECL_EXTERNAL (decl1) = current_extern_inline;
6018 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6019 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6022 /* This function exists in static storage.
6023 (This does not mean `static' in the C sense!) */
6024 TREE_STATIC (decl1) = 1;
6026 /* A nested function is not global. */
6027 if (current_function_decl != 0)
6028 TREE_PUBLIC (decl1) = 0;
6030 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6031 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6036 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6037 != integer_type_node)
6038 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6040 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6041 args = TREE_CHAIN (args))
6043 tree type = args ? TREE_VALUE (args) : 0;
6045 if (type == void_type_node)
6052 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6053 pedwarn_with_decl (decl1,
6054 "first argument of `%s' should be `int'");
6058 if (TREE_CODE (type) != POINTER_TYPE
6059 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6060 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6062 pedwarn_with_decl (decl1,
6063 "second argument of `%s' should be `char **'");
6067 if (TREE_CODE (type) != POINTER_TYPE
6068 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6069 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6071 pedwarn_with_decl (decl1,
6072 "third argument of `%s' should probably be `char **'");
6077 /* It is intentional that this message does not mention the third
6078 argument because it's only mentioned in an appendix of the
6080 if (argct > 0 && (argct < 2 || argct > 3))
6081 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6083 if (! TREE_PUBLIC (decl1))
6084 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6087 /* Record the decl so that the function name is defined.
6088 If we already have a decl for this name, and it is a FUNCTION_DECL,
6089 use the old decl. */
6091 current_function_decl = pushdecl (decl1);
6094 declare_parm_level (1);
6095 current_binding_level->subblocks_tag_transparent = 1;
6097 make_decl_rtl (current_function_decl, NULL);
6099 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6100 /* Promote the value to int before returning it. */
6101 if (c_promoting_integer_type_p (restype))
6103 /* It retains unsignedness if traditional
6104 or if not really getting wider. */
6105 if (TREE_UNSIGNED (restype)
6106 && (flag_traditional
6107 || (TYPE_PRECISION (restype)
6108 == TYPE_PRECISION (integer_type_node))))
6109 restype = unsigned_type_node;
6111 restype = integer_type_node;
6113 DECL_RESULT (current_function_decl)
6114 = build_decl (RESULT_DECL, NULL_TREE, restype);
6116 /* If this fcn was already referenced via a block-scope `extern' decl
6117 (or an implicit decl), propagate certain information about the usage. */
6118 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6119 TREE_ADDRESSABLE (current_function_decl) = 1;
6121 immediate_size_expand = old_immediate_size_expand;
6123 start_fname_decls ();
6128 /* Record that this function is going to be a varargs function.
6129 This is called before store_parm_decls, which is too early
6130 to call mark_varargs directly. */
6135 c_function_varargs = 1;
6138 /* Store the parameter declarations into the current function declaration.
6139 This is called after parsing the parameter declarations, before
6140 digesting the body of the function.
6142 For an old-style definition, modify the function's type
6143 to specify at least the number of arguments. */
6148 register tree fndecl = current_function_decl;
6151 /* This is either a chain of PARM_DECLs (if a prototype was used)
6152 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6153 tree specparms = current_function_parms;
6155 /* This is a list of types declared among parms in a prototype. */
6156 tree parmtags = current_function_parm_tags;
6158 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6159 register tree parmdecls = getdecls ();
6161 /* This is a chain of any other decls that came in among the parm
6162 declarations. If a parm is declared with enum {foo, bar} x;
6163 then CONST_DECLs for foo and bar are put here. */
6166 /* Nonzero if this definition is written with a prototype. */
6169 /* The function containing FNDECL, if any. */
6170 tree context = decl_function_context (fndecl);
6172 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6174 /* This case is when the function was defined with an ANSI prototype.
6175 The parms already have decls, so we need not do anything here
6176 except record them as in effect
6177 and complain if any redundant old-style parm decls were written. */
6188 error_with_decl (fndecl,
6189 "parm types given both in parmlist and separately");
6190 /* Get rid of the erroneous decls; don't keep them on
6191 the list of parms, since they might not be PARM_DECLs. */
6192 for (decl = current_binding_level->names;
6193 decl; decl = TREE_CHAIN (decl))
6194 if (DECL_NAME (decl))
6195 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6196 for (link = current_binding_level->shadowed;
6197 link; link = TREE_CHAIN (link))
6198 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6199 current_binding_level->names = 0;
6200 current_binding_level->shadowed = 0;
6203 specparms = nreverse (specparms);
6204 for (parm = specparms; parm; parm = next)
6206 next = TREE_CHAIN (parm);
6207 if (TREE_CODE (parm) == PARM_DECL)
6209 if (DECL_NAME (parm) == 0)
6210 error_with_decl (parm, "parameter name omitted");
6211 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6212 && VOID_TYPE_P (TREE_TYPE (parm)))
6214 error_with_decl (parm, "parameter `%s' declared void");
6215 /* Change the type to error_mark_node so this parameter
6216 will be ignored by assign_parms. */
6217 TREE_TYPE (parm) = error_mark_node;
6223 /* If we find an enum constant or a type tag,
6224 put it aside for the moment. */
6225 TREE_CHAIN (parm) = 0;
6226 others = chainon (others, parm);
6230 /* Get the decls in their original chain order
6231 and record in the function. */
6232 DECL_ARGUMENTS (fndecl) = getdecls ();
6235 /* If this function takes a variable number of arguments,
6236 add a phony parameter to the end of the parm list,
6237 to represent the position of the first unnamed argument. */
6238 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6241 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6242 /* Let's hope the address of the unnamed parm
6243 won't depend on its type. */
6244 TREE_TYPE (dummy) = integer_type_node;
6245 DECL_ARG_TYPE (dummy) = integer_type_node;
6246 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6250 /* Now pushdecl the enum constants. */
6251 for (parm = others; parm; parm = next)
6253 next = TREE_CHAIN (parm);
6254 if (DECL_NAME (parm) == 0)
6256 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6258 else if (TREE_CODE (parm) != PARM_DECL)
6262 storetags (chainon (parmtags, gettags ()));
6266 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6267 each with a parm name as the TREE_VALUE.
6269 PARMDECLS is a chain of declarations for parameters.
6270 Warning! It can also contain CONST_DECLs which are not parameters
6271 but are names of enumerators of any enum types
6272 declared among the parameters.
6274 First match each formal parameter name with its declaration.
6275 Associate decls with the names and store the decls
6276 into the TREE_PURPOSE slots. */
6278 /* We use DECL_WEAK as a flag to show which parameters have been
6279 seen already since it is not used on PARM_DECL or CONST_DECL. */
6280 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6281 DECL_WEAK (parm) = 0;
6283 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6285 register tree tail, found = NULL;
6287 if (TREE_VALUE (parm) == 0)
6289 error_with_decl (fndecl,
6290 "parameter name missing from parameter list");
6291 TREE_PURPOSE (parm) = 0;
6295 /* See if any of the parmdecls specifies this parm by name.
6296 Ignore any enumerator decls. */
6297 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6298 if (DECL_NAME (tail) == TREE_VALUE (parm)
6299 && TREE_CODE (tail) == PARM_DECL)
6305 /* If declaration already marked, we have a duplicate name.
6306 Complain, and don't use this decl twice. */
6307 if (found && DECL_WEAK (found))
6309 error_with_decl (found, "multiple parameters named `%s'");
6313 /* If the declaration says "void", complain and ignore it. */
6314 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6316 error_with_decl (found, "parameter `%s' declared void");
6317 TREE_TYPE (found) = integer_type_node;
6318 DECL_ARG_TYPE (found) = integer_type_node;
6319 layout_decl (found, 0);
6322 /* Traditionally, a parm declared float is actually a double. */
6323 if (found && flag_traditional
6324 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6326 TREE_TYPE (found) = double_type_node;
6327 DECL_ARG_TYPE (found) = double_type_node;
6328 layout_decl (found, 0);
6331 /* If no declaration found, default to int. */
6334 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6336 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6337 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6338 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6340 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6341 else if (extra_warnings)
6342 warning_with_decl (found, "type of `%s' defaults to `int'");
6346 TREE_PURPOSE (parm) = found;
6348 /* Mark this decl as "already found". */
6349 DECL_WEAK (found) = 1;
6352 /* Put anything which is on the parmdecls chain and which is
6353 not a PARM_DECL onto the list NONPARMS. (The types of
6354 non-parm things which might appear on the list include
6355 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6356 any actual PARM_DECLs not matched with any names. */
6359 for (parm = parmdecls; parm;)
6361 tree next = TREE_CHAIN (parm);
6362 TREE_CHAIN (parm) = 0;
6364 if (TREE_CODE (parm) != PARM_DECL)
6365 nonparms = chainon (nonparms, parm);
6368 /* Complain about args with incomplete types. */
6369 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6371 error_with_decl (parm, "parameter `%s' has incomplete type");
6372 TREE_TYPE (parm) = error_mark_node;
6375 if (! DECL_WEAK (parm))
6377 error_with_decl (parm,
6378 "declaration for parameter `%s' but no such parameter");
6379 /* Pretend the parameter was not missing.
6380 This gets us to a standard state and minimizes
6381 further error messages. */
6383 = chainon (specparms,
6384 tree_cons (parm, NULL_TREE, NULL_TREE));
6391 /* Chain the declarations together in the order of the list of
6392 names. Store that chain in the function decl, replacing the
6395 DECL_ARGUMENTS (fndecl) = 0;
6398 for (last = 0; parm; parm = TREE_CHAIN (parm))
6399 if (TREE_PURPOSE (parm))
6402 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6404 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6405 last = TREE_PURPOSE (parm);
6406 TREE_CHAIN (last) = 0;
6410 /* If there was a previous prototype,
6411 set the DECL_ARG_TYPE of each argument according to
6412 the type previously specified, and report any mismatches. */
6414 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6417 for (parm = DECL_ARGUMENTS (fndecl),
6418 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6419 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6420 != void_type_node));
6421 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6423 if (parm == 0 || type == 0
6424 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6426 error ("number of arguments doesn't match prototype");
6427 error_with_file_and_line (current_function_prototype_file,
6428 current_function_prototype_line,
6429 "prototype declaration");
6432 /* Type for passing arg must be consistent
6433 with that declared for the arg. */
6434 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6436 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6437 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6439 /* Adjust argument to match prototype. E.g. a previous
6440 `int foo(float);' prototype causes
6441 `int foo(x) float x; {...}' to be treated like
6442 `int foo(float x) {...}'. This is particularly
6443 useful for argument types like uid_t. */
6444 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6446 if (PROMOTE_PROTOTYPES
6447 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6448 && TYPE_PRECISION (TREE_TYPE (parm))
6449 < TYPE_PRECISION (integer_type_node))
6450 DECL_ARG_TYPE (parm) = integer_type_node;
6454 pedwarn ("promoted argument `%s' doesn't match prototype",
6455 IDENTIFIER_POINTER (DECL_NAME (parm)));
6456 warning_with_file_and_line
6457 (current_function_prototype_file,
6458 current_function_prototype_line,
6459 "prototype declaration");
6462 /* If -traditional, allow `int' argument to match
6463 `unsigned' prototype. */
6464 else if (! (flag_traditional
6465 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6466 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6468 error ("argument `%s' doesn't match prototype",
6469 IDENTIFIER_POINTER (DECL_NAME (parm)));
6470 error_with_file_and_line (current_function_prototype_file,
6471 current_function_prototype_line,
6472 "prototype declaration");
6476 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6479 /* Otherwise, create a prototype that would match. */
6483 tree actual = 0, last = 0, type;
6485 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6487 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6489 TREE_CHAIN (last) = type;
6494 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6496 TREE_CHAIN (last) = type;
6500 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6501 of the type of this function, but we need to avoid having this
6502 affect the types of other similarly-typed functions, so we must
6503 first force the generation of an identical (but separate) type
6504 node for the relevant function type. The new node we create
6505 will be a variant of the main variant of the original function
6508 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6510 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6513 /* Now store the final chain of decls for the arguments
6514 as the decl-chain of the current lexical scope.
6515 Put the enumerators in as well, at the front so that
6516 DECL_ARGUMENTS is not modified. */
6518 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6521 /* Make sure the binding level for the top of the function body
6522 gets a BLOCK if there are any in the function.
6523 Otherwise, the dbx output is wrong. */
6525 keep_next_if_subblocks = 1;
6527 /* ??? This might be an improvement,
6528 but needs to be thought about some more. */
6530 keep_next_level_flag = 1;
6533 /* Write a record describing this function definition to the prototypes
6534 file (if requested). */
6536 gen_aux_info_record (fndecl, 1, 0, prototype);
6538 /* Initialize the RTL code for the function. */
6539 init_function_start (fndecl, input_filename, lineno);
6541 /* Begin the statement tree for this function. */
6542 DECL_LANG_SPECIFIC (current_function_decl)
6543 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6544 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6546 /* If this is a nested function, save away the sizes of any
6547 variable-size types so that we can expand them when generating
6553 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6554 = nreverse (get_pending_sizes ());
6555 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6558 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6561 /* This function is being processed in whole-function mode. */
6562 cfun->x_whole_function_mode_p = 1;
6564 /* Even though we're inside a function body, we still don't want to
6565 call expand_expr to calculate the size of a variable-sized array.
6566 We haven't necessarily assigned RTL to all variables yet, so it's
6567 not safe to try to expand expressions involving them. */
6568 immediate_size_expand = 0;
6569 cfun->x_dont_save_pending_sizes_p = 1;
6572 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6573 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6574 stands for an ellipsis in the identifier list.
6576 PARMLIST is the data returned by get_parm_info for the
6577 parmlist that follows the semicolon.
6579 We return a value of the same sort that get_parm_info returns,
6580 except that it describes the combination of identifiers and parmlist. */
6583 combine_parm_decls (specparms, parmlist, void_at_end)
6584 tree specparms, parmlist;
6587 register tree fndecl = current_function_decl;
6590 tree parmdecls = TREE_PURPOSE (parmlist);
6592 /* This is a chain of any other decls that came in among the parm
6593 declarations. They were separated already by get_parm_info,
6594 so we just need to keep them separate. */
6595 tree nonparms = TREE_VALUE (parmlist);
6599 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6600 DECL_WEAK (parm) = 0;
6602 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6604 register tree tail, found = NULL;
6606 /* See if any of the parmdecls specifies this parm by name. */
6607 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6608 if (DECL_NAME (tail) == TREE_VALUE (parm))
6614 /* If declaration already marked, we have a duplicate name.
6615 Complain, and don't use this decl twice. */
6616 if (found && DECL_WEAK (found))
6618 error_with_decl (found, "multiple parameters named `%s'");
6622 /* If the declaration says "void", complain and ignore it. */
6623 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6625 error_with_decl (found, "parameter `%s' declared void");
6626 TREE_TYPE (found) = integer_type_node;
6627 DECL_ARG_TYPE (found) = integer_type_node;
6628 layout_decl (found, 0);
6631 /* Traditionally, a parm declared float is actually a double. */
6632 if (found && flag_traditional
6633 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6635 TREE_TYPE (found) = double_type_node;
6636 DECL_ARG_TYPE (found) = double_type_node;
6637 layout_decl (found, 0);
6640 /* If no declaration found, default to int. */
6643 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6645 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6646 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6647 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6648 error_with_decl (found, "type of parameter `%s' is not declared");
6652 TREE_PURPOSE (parm) = found;
6654 /* Mark this decl as "already found". */
6655 DECL_WEAK (found) = 1;
6658 /* Complain about any actual PARM_DECLs not matched with any names. */
6660 for (parm = parmdecls; parm;)
6662 tree next = TREE_CHAIN (parm);
6663 TREE_CHAIN (parm) = 0;
6665 /* Complain about args with incomplete types. */
6666 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6668 error_with_decl (parm, "parameter `%s' has incomplete type");
6669 TREE_TYPE (parm) = error_mark_node;
6672 if (! DECL_WEAK (parm))
6674 error_with_decl (parm,
6675 "declaration for parameter `%s' but no such parameter");
6676 /* Pretend the parameter was not missing.
6677 This gets us to a standard state and minimizes
6678 further error messages. */
6680 = chainon (specparms,
6681 tree_cons (parm, NULL_TREE, NULL_TREE));
6687 /* Chain the declarations together in the order of the list of names.
6688 At the same time, build up a list of their types, in reverse order. */
6694 for (last = 0; parm; parm = TREE_CHAIN (parm))
6695 if (TREE_PURPOSE (parm))
6698 parmdecls = TREE_PURPOSE (parm);
6700 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6701 last = TREE_PURPOSE (parm);
6702 TREE_CHAIN (last) = 0;
6704 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6709 return tree_cons (parmdecls, nonparms,
6710 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6712 return tree_cons (parmdecls, nonparms, nreverse (types));
6715 /* Finish up a function declaration and compile that function
6716 all the way to assembler language output. The free the storage
6717 for the function definition.
6719 This is called after parsing the body of the function definition.
6721 NESTED is nonzero if the function being finished is nested in another. */
6724 finish_function (nested)
6727 register tree fndecl = current_function_decl;
6729 /* TREE_READONLY (fndecl) = 1;
6730 This caused &foo to be of type ptr-to-const-function
6731 which then got a warning when stored in a ptr-to-function variable. */
6734 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6736 /* Must mark the RESULT_DECL as being in this function. */
6738 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6740 /* Obey `register' declarations if `setjmp' is called in this fn. */
6741 if (flag_traditional && current_function_calls_setjmp)
6743 setjmp_protect (DECL_INITIAL (fndecl));
6744 setjmp_protect_args ();
6747 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6749 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6750 != integer_type_node)
6752 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6753 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6755 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6759 #ifdef DEFAULT_MAIN_RETURN
6760 /* Make it so that `main' always returns success by default. */
6761 DEFAULT_MAIN_RETURN;
6764 c_expand_return (integer_zero_node);
6769 finish_fname_decls ();
6771 /* Tie off the statement tree for this function. */
6772 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6773 /* Clear out memory we no longer need. */
6774 free_after_parsing (cfun);
6775 /* Since we never call rest_of_compilation, we never clear
6776 CFUN. Do so explicitly. */
6777 free_after_compilation (cfun);
6782 /* Generate RTL for the body of this function. */
6783 c_expand_body (fndecl, nested);
6784 /* Let the error reporting routines know that we're outside a
6785 function. For a nested function, this value is used in
6786 pop_c_function_context and then reset via pop_function_context. */
6787 current_function_decl = NULL;
6791 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6792 then we are already in the process of generating RTL for another
6796 c_expand_body (fndecl, nested_p)
6800 /* There's no reason to do any of the work here if we're only doing
6801 semantic analysis; this code just generates RTL. */
6802 if (flag_syntax_only)
6807 /* Make sure that we will evaluate variable-sized types involved
6808 in our function's type. */
6809 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6810 /* Squirrel away our current state. */
6811 push_function_context ();
6814 /* Initialize the RTL code for the function. */
6815 current_function_decl = fndecl;
6816 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6818 /* This function is being processed in whole-function mode. */
6819 cfun->x_whole_function_mode_p = 1;
6821 /* Even though we're inside a function body, we still don't want to
6822 call expand_expr to calculate the size of a variable-sized array.
6823 We haven't necessarily assigned RTL to all variables yet, so it's
6824 not safe to try to expand expressions involving them. */
6825 immediate_size_expand = 0;
6826 cfun->x_dont_save_pending_sizes_p = 1;
6828 /* If this is a varargs function, inform function.c. */
6829 if (c_function_varargs)
6832 /* Set up parameters and prepare for return, for the function. */
6833 expand_function_start (fndecl, 0);
6835 /* If this function is `main', emit a call to `__main'
6836 to run global initializers, etc. */
6837 if (DECL_NAME (fndecl)
6838 && MAIN_NAME_P (DECL_NAME (fndecl))
6839 && DECL_CONTEXT (fndecl) == NULL_TREE)
6840 expand_main_function ();
6842 /* Generate the RTL for this function. */
6843 expand_stmt (DECL_SAVED_TREE (fndecl));
6844 /* Allow the body of the function to be garbage collected. */
6845 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6847 /* We hard-wired immediate_size_expand to zero above.
6848 expand_function_end will decrement this variable. So, we set the
6849 variable to one here, so that after the decrement it will remain
6851 immediate_size_expand = 1;
6853 /* Allow language dialects to perform special processing. */
6854 if (lang_expand_function_end)
6855 (*lang_expand_function_end) ();
6857 /* Generate rtl for function exit. */
6858 expand_function_end (input_filename, lineno, 0);
6860 /* If this is a nested function, protect the local variables in the stack
6861 above us from being collected while we're compiling this function. */
6863 ggc_push_context ();
6865 /* Run the optimizers and output the assembler code for this function. */
6866 rest_of_compilation (fndecl);
6868 /* Undo the GC context switch. */
6872 /* With just -W, complain only if function returns both with
6873 and without a value. */
6875 && current_function_returns_value
6876 && current_function_returns_null)
6877 warning ("this function may return with or without a value");
6879 /* If requested, warn about function definitions where the function will
6880 return a value (usually of some struct or union type) which itself will
6881 take up a lot of stack space. */
6883 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6885 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6887 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6888 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6889 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6892 unsigned int size_as_int
6893 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6895 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6896 warning_with_decl (fndecl,
6897 "size of return value of `%s' is %u bytes",
6900 warning_with_decl (fndecl,
6901 "size of return value of `%s' is larger than %d bytes",
6906 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6908 /* Stop pointing to the local nodes about to be freed.
6909 But DECL_INITIAL must remain nonzero so we know this
6910 was an actual function definition.
6911 For a nested function, this is done in pop_c_function_context.
6912 If rest_of_compilation set this to 0, leave it 0. */
6913 if (DECL_INITIAL (fndecl) != 0)
6914 DECL_INITIAL (fndecl) = error_mark_node;
6916 DECL_ARGUMENTS (fndecl) = 0;
6919 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6921 #ifndef ASM_OUTPUT_CONSTRUCTOR
6922 if (! flag_gnu_linker)
6923 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6926 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6929 if (DECL_STATIC_DESTRUCTOR (fndecl))
6931 #ifndef ASM_OUTPUT_DESTRUCTOR
6932 if (! flag_gnu_linker)
6933 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6936 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6940 /* Return to the enclosing function. */
6941 pop_function_context ();
6944 /* Check the declarations given in a for-loop for satisfying the C99
6947 check_for_loop_decls ()
6953 /* If we get here, declarations have been used in a for loop without
6954 the C99 for loop scope. This doesn't make much sense, so don't
6956 error ("`for' loop initial declaration used outside C99 mode");
6959 /* C99 subclause 6.8.5 paragraph 3:
6961 [#3] The declaration part of a for statement shall only
6962 declare identifiers for objects having storage class auto or
6965 It isn't clear whether, in this sentence, "identifiers" binds to
6966 "shall only declare" or to "objects" - that is, whether all identifiers
6967 declared must be identifiers for objects, or whether the restriction
6968 only applies to those that are. (A question on this in comp.std.c
6969 in November 2000 received no answer.) We implement the strictest
6970 interpretation, to avoid creating an extension which later causes
6973 for (t = gettags (); t; t = TREE_CHAIN (t))
6975 if (TREE_PURPOSE (t) != 0)
6976 error ("`%s %s' declared in `for' loop initial declaration",
6977 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6978 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6980 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6982 for (t = getdecls (); t; t = TREE_CHAIN (t))
6984 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6985 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6986 else if (TREE_STATIC (t))
6987 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6988 else if (DECL_EXTERNAL (t))
6989 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6993 /* Save and restore the variables in this file and elsewhere
6994 that keep track of the progress of compilation of the current function.
6995 Used for nested functions. */
6997 struct c_language_function
6999 struct language_function base;
7001 tree shadowed_labels;
7004 int warn_about_return_type;
7006 struct binding_level *binding_level;
7009 /* Save and reinitialize the variables
7010 used during compilation of a C function. */
7013 push_c_function_context (f)
7016 struct c_language_function *p;
7017 p = ((struct c_language_function *)
7018 xmalloc (sizeof (struct c_language_function)));
7019 f->language = (struct language_function *) p;
7021 p->base.x_stmt_tree = c_stmt_tree;
7022 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7023 p->named_labels = named_labels;
7024 p->shadowed_labels = shadowed_labels;
7025 p->returns_value = current_function_returns_value;
7026 p->returns_null = current_function_returns_null;
7027 p->warn_about_return_type = warn_about_return_type;
7028 p->extern_inline = current_extern_inline;
7029 p->binding_level = current_binding_level;
7032 /* Restore the variables used during compilation of a C function. */
7035 pop_c_function_context (f)
7038 struct c_language_function *p
7039 = (struct c_language_function *) f->language;
7042 /* Bring back all the labels that were shadowed. */
7043 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7044 if (DECL_NAME (TREE_VALUE (link)) != 0)
7045 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7046 = TREE_VALUE (link);
7048 if (DECL_SAVED_INSNS (current_function_decl) == 0
7049 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7051 /* Stop pointing to the local nodes about to be freed. */
7052 /* But DECL_INITIAL must remain nonzero so we know this
7053 was an actual function definition. */
7054 DECL_INITIAL (current_function_decl) = error_mark_node;
7055 DECL_ARGUMENTS (current_function_decl) = 0;
7058 c_stmt_tree = p->base.x_stmt_tree;
7059 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7060 named_labels = p->named_labels;
7061 shadowed_labels = p->shadowed_labels;
7062 current_function_returns_value = p->returns_value;
7063 current_function_returns_null = p->returns_null;
7064 warn_about_return_type = p->warn_about_return_type;
7065 current_extern_inline = p->extern_inline;
7066 current_binding_level = p->binding_level;
7072 /* Mark the language specific parts of F for GC. */
7075 mark_c_function_context (f)
7078 struct c_language_function *p
7079 = (struct c_language_function *) f->language;
7084 mark_c_language_function (&p->base);
7085 ggc_mark_tree (p->shadowed_labels);
7086 ggc_mark_tree (p->named_labels);
7087 mark_binding_level (&p->binding_level);
7090 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7093 copy_lang_decl (decl)
7096 struct lang_decl *ld;
7098 if (!DECL_LANG_SPECIFIC (decl))
7101 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7102 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7103 sizeof (struct lang_decl));
7104 DECL_LANG_SPECIFIC (decl) = ld;
7107 /* Mark the language specific bits in T for GC. */
7113 if (TREE_CODE (t) == IDENTIFIER_NODE)
7115 struct lang_identifier *i = (struct lang_identifier *) t;
7116 ggc_mark_tree (i->global_value);
7117 ggc_mark_tree (i->local_value);
7118 ggc_mark_tree (i->label_value);
7119 ggc_mark_tree (i->implicit_decl);
7120 ggc_mark_tree (i->error_locus);
7121 ggc_mark_tree (i->limbo_value);
7123 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7124 ggc_mark (TYPE_LANG_SPECIFIC (t));
7125 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7127 ggc_mark (DECL_LANG_SPECIFIC (t));
7128 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7129 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7133 /* The functions below are required for functionality of doing
7134 function at once processing in the C front end. Currently these
7135 functions are not called from anywhere in the C front end, but as
7136 these changes continue, that will change. */
7138 /* Returns non-zero if the current statement is a full expression,
7139 i.e. temporaries created during that statement should be destroyed
7140 at the end of the statement. */
7143 stmts_are_full_exprs_p ()
7148 /* Returns the stmt_tree (if any) to which statements are currently
7149 being added. If there is no active statement-tree, NULL is
7153 current_stmt_tree ()
7155 return &c_stmt_tree;
7158 /* Returns the stack of SCOPE_STMTs for the current function. */
7161 current_scope_stmt_stack ()
7163 return &c_scope_stmt_stack;
7166 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7170 anon_aggr_type_p (node)
7171 tree node ATTRIBUTE_UNUSED;
7176 /* Dummy function in place of callback used by C++. */
7179 extract_interface_info ()
7183 /* Return a new COMPOUND_STMT, after adding it to the current
7187 c_begin_compound_stmt ()
7191 /* Create the COMPOUND_STMT. */
7192 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7197 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7201 c_expand_decl_stmt (t)
7204 tree decl = DECL_STMT_DECL (t);
7206 /* Expand nested functions. */
7207 if (TREE_CODE (decl) == FUNCTION_DECL
7208 && DECL_CONTEXT (decl) == current_function_decl
7209 && DECL_SAVED_TREE (decl))
7210 c_expand_body (decl, /*nested_p=*/1);
7213 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7214 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7217 identifier_global_value (t)
7220 return IDENTIFIER_GLOBAL_VALUE (t);
7223 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7224 otherwise the name is found in ridpointers from RID_INDEX. */
7227 record_builtin_type (rid_index, name, type)
7234 id = ridpointers[(int) rid_index];
7236 id = get_identifier (name);
7237 pushdecl (build_decl (TYPE_DECL, id, type));
7240 /* Build the void_list_node (void_type_node having been created). */
7242 build_void_list_node ()
7244 tree t = build_tree_list (NULL_TREE, void_type_node);