1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* Process declarations and symbol lookup for C front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
45 extern cpp_reader parse_in;
48 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
50 { NORMAL, /* Ordinary declaration */
51 FUNCDEF, /* Function definition */
52 PARM, /* Declaration of parm before function body */
53 FIELD, /* Declaration inside struct or union */
54 BITFIELD, /* Likewise but with specified width */
55 TYPENAME}; /* Typename (inside cast or sizeof) */
57 /* We let tm.h override the types used here, to handle trivial differences
58 such as the choice of unsigned int or long unsigned int for size_t.
59 When machines start needing nontrivial differences in the size type,
60 it would be best to do something here to figure out automatically
61 from other information what type to use. */
64 #define SIZE_TYPE "long unsigned int"
68 #define PTRDIFF_TYPE "long int"
72 #define WCHAR_TYPE "int"
78 /* Nonzero if we have seen an invalid cross reference
79 to a struct, union, or enum, but not yet printed the message. */
81 tree pending_invalid_xref;
82 /* File and line to appear in the eventual error message. */
83 const char *pending_invalid_xref_file;
84 int pending_invalid_xref_line;
86 /* While defining an enum type, this is 1 plus the last enumerator
87 constant value. Note that will do not have to save this or `enum_overflow'
88 around nested function definition since such a definition could only
89 occur in an enum value expression and we don't use these variables in
92 static tree enum_next_value;
94 /* Nonzero means that there was overflow computing enum_next_value. */
96 static int enum_overflow;
98 /* Parsing a function declarator leaves a list of parameter names
99 or a chain or parameter decls here. */
101 static tree last_function_parms;
103 /* Parsing a function declarator leaves here a chain of structure
104 and enum types declared in the parmlist. */
106 static tree last_function_parm_tags;
108 /* After parsing the declarator that starts a function definition,
109 `start_function' puts here the list of parameter names or chain of decls.
110 `store_parm_decls' finds it here. */
112 static tree current_function_parms;
114 /* Similar, for last_function_parm_tags. */
115 static tree current_function_parm_tags;
117 /* Similar, for the file and line that the prototype came from if this is
118 an old-style definition. */
119 static const char *current_function_prototype_file;
120 static int current_function_prototype_line;
122 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
123 that have names. Here so we can clear out their names' definitions
124 at the end of the function. */
126 static tree named_labels;
128 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
130 static tree shadowed_labels;
132 /* Nonzero when store_parm_decls is called indicates a varargs function.
133 Value not meaningful after store_parm_decls. */
135 static int c_function_varargs;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null;
147 /* Set to nonzero by `grokdeclarator' for a function
148 whose return type is defaulted, if warnings for this are desired. */
150 static int warn_about_return_type;
152 /* Nonzero when starting a function declared `extern inline'. */
154 static int current_extern_inline;
156 /* For each binding contour we allocate a binding_level structure
157 * which records the names defined in that contour.
160 * 1) one for each function definition,
161 * where internal declarations of the parameters appear.
162 * 2) one for each compound statement,
163 * to record its declarations.
165 * The current meaning of a name can be found by searching the levels from
166 * the current one out to the global one.
169 /* Note that the information in the `names' component of the global contour
170 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
174 /* A chain of _DECL nodes for all variables, constants, functions,
175 and typedef types. These are in the reverse of the order supplied.
179 /* A list of structure, union and enum definitions,
180 * for looking up tag names.
181 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
182 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
183 * or ENUMERAL_TYPE node.
187 /* For each level, a list of shadowed outer-level local definitions
188 to be restored when this level is popped.
189 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
190 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
193 /* For each level (except not the global one),
194 a chain of BLOCK nodes for all the levels
195 that were entered and exited one level down. */
198 /* The BLOCK node for this level, if one has been preallocated.
199 If 0, the BLOCK is allocated (if needed) when the level is popped. */
202 /* The binding level which this one is contained in (inherits from). */
203 struct binding_level *level_chain;
205 /* Nonzero for the level that holds the parameters of a function. */
208 /* Nonzero if this level "doesn't exist" for tags. */
209 char tag_transparent;
211 /* Nonzero if sublevels of this level "don't exist" for tags.
212 This is set in the parm level of a function definition
213 while reading the function body, so that the outermost block
214 of the function body will be tag-transparent. */
215 char subblocks_tag_transparent;
217 /* Nonzero means make a BLOCK for this level regardless of all else. */
220 /* Nonzero means make a BLOCK if this level has any subblocks. */
221 char keep_if_subblocks;
223 /* Number of decls in `names' that have incomplete
224 structure or union types. */
227 /* A list of decls giving the (reversed) specified order of parms,
228 not including any forward-decls in the parmlist.
229 This is so we can put the parms in proper order for assign_parms. */
233 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
235 /* The binding level currently in effect. */
237 static struct binding_level *current_binding_level;
239 /* A chain of binding_level structures awaiting reuse. */
241 static struct binding_level *free_binding_level;
243 /* The outermost binding level, for names of file scope.
244 This is created when the compiler is started and exists
245 through the entire run. */
247 static struct binding_level *global_binding_level;
249 /* Binding level structures are initialized by copying this one. */
251 static struct binding_level clear_binding_level
252 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
255 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
257 static int keep_next_level_flag;
259 /* Nonzero means make a BLOCK for the next level pushed
260 if it has subblocks. */
262 static int keep_next_if_subblocks;
264 /* The chain of outer levels of label scopes.
265 This uses the same data structure used for binding levels,
266 but it works differently: each link in the chain records
267 saved values of named_labels and shadowed_labels for
268 a label binding level outside the current one. */
270 static struct binding_level *label_level_chain;
272 /* Functions called automatically at the beginning and end of execution. */
274 tree static_ctors, static_dtors;
276 /* Forward declarations. */
278 static struct binding_level * make_binding_level PARAMS ((void));
279 static void mark_binding_level PARAMS ((void *));
280 static void clear_limbo_values PARAMS ((tree));
281 static int duplicate_decls PARAMS ((tree, tree, int));
282 static int redeclaration_error_message PARAMS ((tree, tree));
283 static void storedecls PARAMS ((tree));
284 static void storetags PARAMS ((tree));
285 static tree lookup_tag PARAMS ((enum tree_code, tree,
286 struct binding_level *, int));
287 static tree lookup_tag_reverse PARAMS ((tree));
288 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
290 static tree grokparms PARAMS ((tree, int));
291 static void layout_array_type PARAMS ((tree));
292 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
294 /* C-specific option variables. */
296 /* Nonzero means allow type mismatches in conditional expressions;
297 just make their values `void'. */
299 int flag_cond_mismatch;
301 /* Nonzero means give `double' the same size as `float'. */
303 int flag_short_double;
305 /* Nonzero means give `wchar_t' the same size as `short'. */
307 int flag_short_wchar;
309 /* Nonzero means don't recognize the keyword `asm'. */
313 /* Nonzero means don't recognize any builtin functions. */
317 /* Nonzero means don't recognize the non-ANSI builtin functions.
320 int flag_no_nonansi_builtin;
322 /* Nonzero means do some things the same way PCC does. */
324 int flag_traditional;
326 /* Nonzero means use the ISO C99 dialect of C. */
330 /* Nonzero means that we have builtin functions, and main is an int */
334 /* Nonzero means to allow single precision math even if we're generally
335 being traditional. */
336 int flag_allow_single_precision = 0;
338 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
340 int flag_signed_bitfields = 1;
341 int explicit_flag_signed_bitfields = 0;
343 /* Nonzero means warn about use of implicit int. */
345 int warn_implicit_int;
347 /* Nonzero means warn about usage of long long when `-pedantic'. */
349 int warn_long_long = 1;
351 /* Nonzero means message about use of implicit function declarations;
352 1 means warning; 2 means error. */
354 int mesg_implicit_function_declaration;
356 /* Nonzero means give string constants the type `const char *'
357 to get extra warnings from them. These warnings will be too numerous
358 to be useful, except in thoroughly ANSIfied programs. */
360 int flag_const_strings;
362 /* Nonzero means warn about pointer casts that can drop a type qualifier
363 from the pointer target type. */
367 /* Nonzero means warn when casting a function call to a type that does
368 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
369 when there is no previous declaration of sqrt or malloc. */
371 int warn_bad_function_cast;
373 /* Warn about functions which might be candidates for attribute noreturn. */
375 int warn_missing_noreturn;
377 /* Warn about traditional constructs whose meanings changed in ANSI C. */
379 int warn_traditional;
381 /* Nonzero means warn about sizeof(function) or addition/subtraction
382 of function pointers. */
384 int warn_pointer_arith;
386 /* Nonzero means warn for non-prototype function decls
387 or non-prototyped defs without previous prototype. */
389 int warn_strict_prototypes;
391 /* Nonzero means warn for any global function def
392 without separate previous prototype decl. */
394 int warn_missing_prototypes;
396 /* Nonzero means warn for any global function def
397 without separate previous decl. */
399 int warn_missing_declarations;
401 /* Nonzero means warn about multiple (redundant) decls for the same single
402 variable or function. */
404 int warn_redundant_decls = 0;
406 /* Nonzero means warn about extern declarations of objects not at
407 file-scope level and about *all* declarations of functions (whether
408 extern or static) not at file-scope level. Note that we exclude
409 implicit function declarations. To get warnings about those, use
412 int warn_nested_externs = 0;
414 /* Warn about *printf or *scanf format/argument anomalies. */
418 /* Warn about a subscript that has type char. */
420 int warn_char_subscripts = 0;
422 /* Warn if a type conversion is done that might have confusing results. */
426 /* Warn if adding () is suggested. */
428 int warn_parentheses;
430 /* Warn if initializer is not completely bracketed. */
432 int warn_missing_braces;
434 /* Warn if main is suspicious. */
438 /* Warn about #pragma directives that are not recognised. */
440 int warn_unknown_pragmas = 0; /* Tri state variable. */
442 /* Warn about comparison of signed and unsigned values.
443 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
445 int warn_sign_compare = -1;
447 /* Warn about testing equality of floating point numbers. */
449 int warn_float_equal = 0;
451 /* Nonzero means warn about use of multicharacter literals. */
453 int warn_multichar = 1;
455 /* Nonzero means `$' can be in an identifier. */
457 #ifndef DOLLARS_IN_IDENTIFIERS
458 #define DOLLARS_IN_IDENTIFIERS 1
460 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
462 /* Decode the string P as a language-specific option for C.
463 Return the number of strings consumed. Should not complain
464 if it does not recognise the option. */
467 c_decode_option (argc, argv)
468 int argc ATTRIBUTE_UNUSED;
471 int strings_processed;
474 strings_processed = cpp_handle_option (&parse_in, argc, argv);
476 strings_processed = 0;
477 #endif /* ! USE_CPPLIB */
479 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
481 flag_traditional = 1;
482 flag_writable_strings = 1;
484 else if (!strcmp (p, "-fallow-single-precision"))
485 flag_allow_single_precision = 1;
486 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
491 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
495 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
499 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
501 flag_traditional = 0;
502 flag_writable_strings = 0;
504 else if (!strncmp (p, "-std=", 5))
506 /* Select the appropriate language standard. We currently
508 -std=iso9899:1990 same as -ansi
509 -std=iso9899:199409 ISO C as modified in amend. 1
510 -std=iso9899:1999 ISO C 99
511 -std=c89 same as -std=iso9899:1990
512 -std=c99 same as -std=iso9899:1999
513 -std=gnu89 default, iso9899:1990 + gnu extensions
514 -std=gnu99 iso9899:1999 + gnu extensions
516 const char *argstart = &p[5];
518 if (!strcmp (argstart, "iso9899:1990")
519 || !strcmp (argstart, "c89"))
522 flag_traditional = 0;
523 flag_writable_strings = 0;
525 flag_no_nonansi_builtin = 1;
528 else if (!strcmp (argstart, "iso9899:199409"))
530 /* ??? The changes since ISO C 1990 are not supported. */
533 else if (!strcmp (argstart, "iso9899:199x")
534 || !strcmp (argstart, "iso9899:1999")
535 || !strcmp (argstart, "c9x")
536 || !strcmp (argstart, "c99"))
538 flag_traditional = 0;
539 flag_writable_strings = 0;
541 flag_no_nonansi_builtin = 1;
544 else if (!strcmp (argstart, "gnu89"))
546 flag_traditional = 0;
547 flag_writable_strings = 0;
549 flag_no_nonansi_builtin = 0;
552 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
554 flag_traditional = 0;
555 flag_writable_strings = 0;
557 flag_no_nonansi_builtin = 0;
561 error ("unknown C standard `%s'", argstart);
563 else if (!strcmp (p, "-fdollars-in-identifiers"))
564 dollars_in_ident = 1;
565 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
566 dollars_in_ident = 0;
567 else if (!strcmp (p, "-fsigned-char"))
568 flag_signed_char = 1;
569 else if (!strcmp (p, "-funsigned-char"))
570 flag_signed_char = 0;
571 else if (!strcmp (p, "-fno-signed-char"))
572 flag_signed_char = 0;
573 else if (!strcmp (p, "-fno-unsigned-char"))
574 flag_signed_char = 1;
575 else if (!strcmp (p, "-fsigned-bitfields")
576 || !strcmp (p, "-fno-unsigned-bitfields"))
578 flag_signed_bitfields = 1;
579 explicit_flag_signed_bitfields = 1;
581 else if (!strcmp (p, "-funsigned-bitfields")
582 || !strcmp (p, "-fno-signed-bitfields"))
584 flag_signed_bitfields = 0;
585 explicit_flag_signed_bitfields = 1;
587 else if (!strcmp (p, "-fshort-enums"))
588 flag_short_enums = 1;
589 else if (!strcmp (p, "-fno-short-enums"))
590 flag_short_enums = 0;
591 else if (!strcmp (p, "-fshort-wchar"))
592 flag_short_wchar = 1;
593 else if (!strcmp (p, "-fno-short-wchar"))
594 flag_short_wchar = 0;
595 else if (!strcmp (p, "-fcond-mismatch"))
596 flag_cond_mismatch = 1;
597 else if (!strcmp (p, "-fno-cond-mismatch"))
598 flag_cond_mismatch = 0;
599 else if (!strcmp (p, "-fshort-double"))
600 flag_short_double = 1;
601 else if (!strcmp (p, "-fno-short-double"))
602 flag_short_double = 0;
603 else if (!strcmp (p, "-fasm"))
605 else if (!strcmp (p, "-fno-asm"))
607 else if (!strcmp (p, "-fbuiltin"))
609 else if (!strcmp (p, "-fno-builtin"))
611 else if (!strcmp (p, "-ansi"))
613 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
614 mesg_implicit_function_declaration = 2;
615 else if (!strcmp (p, "-Wimplicit-function-declaration"))
616 mesg_implicit_function_declaration = 1;
617 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
618 mesg_implicit_function_declaration = 0;
619 else if (!strcmp (p, "-Wimplicit-int"))
620 warn_implicit_int = 1;
621 else if (!strcmp (p, "-Wno-implicit-int"))
622 warn_implicit_int = 0;
623 else if (!strcmp (p, "-Wimplicit"))
625 warn_implicit_int = 1;
626 if (mesg_implicit_function_declaration != 2)
627 mesg_implicit_function_declaration = 1;
629 else if (!strcmp (p, "-Wno-implicit"))
630 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
631 else if (!strcmp (p, "-Wlong-long"))
633 else if (!strcmp (p, "-Wno-long-long"))
635 else if (!strcmp (p, "-Wwrite-strings"))
636 flag_const_strings = 1;
637 else if (!strcmp (p, "-Wno-write-strings"))
638 flag_const_strings = 0;
639 else if (!strcmp (p, "-Wcast-qual"))
641 else if (!strcmp (p, "-Wno-cast-qual"))
643 else if (!strcmp (p, "-Wbad-function-cast"))
644 warn_bad_function_cast = 1;
645 else if (!strcmp (p, "-Wno-bad-function-cast"))
646 warn_bad_function_cast = 0;
647 else if (!strcmp (p, "-Wmissing-noreturn"))
648 warn_missing_noreturn = 1;
649 else if (!strcmp (p, "-Wno-missing-noreturn"))
650 warn_missing_noreturn = 0;
651 else if (!strcmp (p, "-Wpointer-arith"))
652 warn_pointer_arith = 1;
653 else if (!strcmp (p, "-Wno-pointer-arith"))
654 warn_pointer_arith = 0;
655 else if (!strcmp (p, "-Wstrict-prototypes"))
656 warn_strict_prototypes = 1;
657 else if (!strcmp (p, "-Wno-strict-prototypes"))
658 warn_strict_prototypes = 0;
659 else if (!strcmp (p, "-Wmissing-prototypes"))
660 warn_missing_prototypes = 1;
661 else if (!strcmp (p, "-Wno-missing-prototypes"))
662 warn_missing_prototypes = 0;
663 else if (!strcmp (p, "-Wmissing-declarations"))
664 warn_missing_declarations = 1;
665 else if (!strcmp (p, "-Wno-missing-declarations"))
666 warn_missing_declarations = 0;
667 else if (!strcmp (p, "-Wredundant-decls"))
668 warn_redundant_decls = 1;
669 else if (!strcmp (p, "-Wno-redundant-decls"))
670 warn_redundant_decls = 0;
671 else if (!strcmp (p, "-Wnested-externs"))
672 warn_nested_externs = 1;
673 else if (!strcmp (p, "-Wno-nested-externs"))
674 warn_nested_externs = 0;
675 else if (!strcmp (p, "-Wtraditional"))
676 warn_traditional = 1;
677 else if (!strcmp (p, "-Wno-traditional"))
678 warn_traditional = 0;
679 else if (!strncmp (p, "-Wformat=", 9))
680 warn_format = atol (p + 9);
681 else if (!strcmp (p, "-Wformat"))
683 else if (!strcmp (p, "-Wno-format"))
685 else if (!strcmp (p, "-Wchar-subscripts"))
686 warn_char_subscripts = 1;
687 else if (!strcmp (p, "-Wno-char-subscripts"))
688 warn_char_subscripts = 0;
689 else if (!strcmp (p, "-Wconversion"))
691 else if (!strcmp (p, "-Wno-conversion"))
693 else if (!strcmp (p, "-Wparentheses"))
694 warn_parentheses = 1;
695 else if (!strcmp (p, "-Wno-parentheses"))
696 warn_parentheses = 0;
697 else if (!strcmp (p, "-Wreturn-type"))
698 warn_return_type = 1;
699 else if (!strcmp (p, "-Wno-return-type"))
700 warn_return_type = 0;
701 else if (!strcmp (p, "-Wcomment"))
702 ; /* cpp handles this one. */
703 else if (!strcmp (p, "-Wno-comment"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p, "-Wcomments"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p, "-Wno-comments"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p, "-Wtrigraphs"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p, "-Wno-trigraphs"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wundef"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wno-undef"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wimport"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wno-import"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wmissing-braces"))
722 warn_missing_braces = 1;
723 else if (!strcmp (p, "-Wno-missing-braces"))
724 warn_missing_braces = 0;
725 else if (!strcmp (p, "-Wmain"))
727 else if (!strcmp (p, "-Wno-main"))
729 else if (!strcmp (p, "-Wsign-compare"))
730 warn_sign_compare = 1;
731 else if (!strcmp (p, "-Wno-sign-compare"))
732 warn_sign_compare = 0;
733 else if (!strcmp (p, "-Wfloat-equal"))
734 warn_float_equal = 1;
735 else if (!strcmp (p, "-Wno-float-equal"))
736 warn_float_equal = 0;
737 else if (!strcmp (p, "-Wmultichar"))
739 else if (!strcmp (p, "-Wno-multichar"))
741 else if (!strcmp (p, "-Wunknown-pragmas"))
742 /* Set to greater than 1, so that even unknown pragmas in system
743 headers will be warned about. */
744 warn_unknown_pragmas = 2;
745 else if (!strcmp (p, "-Wno-unknown-pragmas"))
746 warn_unknown_pragmas = 0;
747 else if (!strcmp (p, "-Wall"))
749 /* We save the value of warn_uninitialized, since if they put
750 -Wuninitialized on the command line, we need to generate a
751 warning about not using it without also specifying -O. */
752 if (warn_uninitialized != 1)
753 warn_uninitialized = 2;
754 warn_implicit_int = 1;
755 mesg_implicit_function_declaration = 1;
756 warn_return_type = 1;
760 warn_char_subscripts = 1;
761 warn_parentheses = 1;
762 warn_missing_braces = 1;
763 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
764 it off only if it's not explicit. */
766 /* Only warn about unknown pragmas that are not in system headers. */
767 warn_unknown_pragmas = 1;
770 return strings_processed;
775 /* Hooks for print_node. */
778 print_lang_decl (file, node, indent)
779 FILE *file ATTRIBUTE_UNUSED;
780 tree node ATTRIBUTE_UNUSED;
781 int indent ATTRIBUTE_UNUSED;
786 print_lang_type (file, node, indent)
787 FILE *file ATTRIBUTE_UNUSED;
788 tree node ATTRIBUTE_UNUSED;
789 int indent ATTRIBUTE_UNUSED;
794 print_lang_identifier (file, node, indent)
799 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
800 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
801 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
802 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
803 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
804 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
807 /* Hook called at end of compilation to assume 1 elt
808 for a top-level array decl that wasn't complete before. */
811 finish_incomplete_decl (decl)
814 if (TREE_CODE (decl) == VAR_DECL)
816 tree type = TREE_TYPE (decl);
817 if (type != error_mark_node
818 && TREE_CODE (type) == ARRAY_TYPE
819 && TYPE_DOMAIN (type) == 0)
821 if (! DECL_EXTERNAL (decl))
822 warning_with_decl (decl, "array `%s' assumed to have one element");
824 complete_array_type (type, NULL_TREE, 1);
826 layout_decl (decl, 0);
831 /* Create a new `struct binding_level'. */
834 struct binding_level *
835 make_binding_level ()
838 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
841 /* Nonzero if we are currently in the global binding level. */
846 return current_binding_level == global_binding_level;
852 keep_next_level_flag = 1;
855 /* Nonzero if the current level needs to have a BLOCK made. */
860 return ((current_binding_level->keep_if_subblocks
861 && current_binding_level->blocks != 0)
862 || current_binding_level->keep
863 || current_binding_level->names != 0
864 || (current_binding_level->tags != 0
865 && !current_binding_level->tag_transparent));
868 /* Identify this binding level as a level of parameters.
869 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
870 But it turns out there is no way to pass the right value for
871 DEFINITION_FLAG, so we ignore it. */
874 declare_parm_level (definition_flag)
875 int definition_flag ATTRIBUTE_UNUSED;
877 current_binding_level->parm_flag = 1;
880 /* Nonzero if currently making parm declarations. */
885 return current_binding_level->parm_flag;
888 /* Enter a new binding level.
889 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
890 not for that of tags. */
893 pushlevel (tag_transparent)
896 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
898 /* If this is the top level of a function,
899 just make sure that NAMED_LABELS is 0. */
901 if (current_binding_level == global_binding_level)
906 /* Reuse or create a struct for this binding level. */
908 if (free_binding_level)
910 newlevel = free_binding_level;
911 free_binding_level = free_binding_level->level_chain;
915 newlevel = make_binding_level ();
918 /* Add this level to the front of the chain (stack) of levels that
921 *newlevel = clear_binding_level;
922 newlevel->tag_transparent
924 || (current_binding_level
925 ? current_binding_level->subblocks_tag_transparent
927 newlevel->level_chain = current_binding_level;
928 current_binding_level = newlevel;
929 newlevel->keep = keep_next_level_flag;
930 keep_next_level_flag = 0;
931 newlevel->keep_if_subblocks = keep_next_if_subblocks;
932 keep_next_if_subblocks = 0;
935 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
938 clear_limbo_values (block)
943 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
944 if (DECL_NAME (tem) != 0)
945 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
947 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
948 clear_limbo_values (tem);
951 /* Exit a binding level.
952 Pop the level off, and restore the state of the identifier-decl mappings
953 that were in effect when this level was entered.
955 If KEEP is nonzero, this level had explicit declarations, so
956 and create a "block" (a BLOCK node) for the level
957 to record its declarations and subblocks for symbol table output.
959 If FUNCTIONBODY is nonzero, this level is the body of a function,
960 so create a block as if KEEP were set and also clear out all
963 If REVERSE is nonzero, reverse the order of decls before putting
964 them into the BLOCK. */
967 poplevel (keep, reverse, functionbody)
973 /* The chain of decls was accumulated in reverse order.
974 Put it into forward order, just for cleanliness. */
976 tree tags = current_binding_level->tags;
977 tree subblocks = current_binding_level->blocks;
980 int block_previously_created;
982 keep |= current_binding_level->keep;
984 /* This warning is turned off because it causes warnings for
985 declarations like `extern struct foo *x'. */
987 /* Warn about incomplete structure types in this level. */
988 for (link = tags; link; link = TREE_CHAIN (link))
989 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
991 tree type = TREE_VALUE (link);
992 tree type_name = TYPE_NAME (type);
993 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
995 : DECL_NAME (type_name));
996 switch (TREE_CODE (type))
999 error ("`struct %s' incomplete in scope ending here", id);
1002 error ("`union %s' incomplete in scope ending here", id);
1005 error ("`enum %s' incomplete in scope ending here", id);
1011 /* Get the decls in the order they were written.
1012 Usually current_binding_level->names is in reverse order.
1013 But parameter decls were previously put in forward order. */
1016 current_binding_level->names
1017 = decls = nreverse (current_binding_level->names);
1019 decls = current_binding_level->names;
1021 /* Output any nested inline functions within this block
1022 if they weren't already output. */
1024 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1025 if (TREE_CODE (decl) == FUNCTION_DECL
1026 && ! TREE_ASM_WRITTEN (decl)
1027 && DECL_INITIAL (decl) != 0
1028 && TREE_ADDRESSABLE (decl))
1030 /* If this decl was copied from a file-scope decl
1031 on account of a block-scope extern decl,
1032 propagate TREE_ADDRESSABLE to the file-scope decl.
1034 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1035 true, since then the decl goes through save_for_inline_copying. */
1036 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1037 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1038 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1039 else if (DECL_SAVED_INSNS (decl) != 0)
1041 push_function_context ();
1042 output_inline_function (decl);
1043 pop_function_context ();
1047 /* If there were any declarations or structure tags in that level,
1048 or if this level is a function body,
1049 create a BLOCK to record them for the life of this function. */
1052 block_previously_created = (current_binding_level->this_block != 0);
1053 if (block_previously_created)
1054 block = current_binding_level->this_block;
1055 else if (keep || functionbody
1056 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1057 block = make_node (BLOCK);
1060 BLOCK_VARS (block) = decls;
1061 BLOCK_SUBBLOCKS (block) = subblocks;
1064 /* In each subblock, record that this is its superior. */
1066 for (link = subblocks; link; link = TREE_CHAIN (link))
1067 BLOCK_SUPERCONTEXT (link) = block;
1069 /* Clear out the meanings of the local variables of this level. */
1071 for (link = decls; link; link = TREE_CHAIN (link))
1073 if (DECL_NAME (link) != 0)
1075 /* If the ident. was used or addressed via a local extern decl,
1076 don't forget that fact. */
1077 if (DECL_EXTERNAL (link))
1079 if (TREE_USED (link))
1080 TREE_USED (DECL_NAME (link)) = 1;
1081 if (TREE_ADDRESSABLE (link))
1082 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1084 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1088 /* Restore all name-meanings of the outer levels
1089 that were shadowed by this level. */
1091 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1092 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1094 /* If the level being exited is the top level of a function,
1095 check over all the labels, and clear out the current
1096 (function local) meanings of their names. */
1100 clear_limbo_values (block);
1102 /* If this is the top level block of a function,
1103 the vars are the function's parameters.
1104 Don't leave them in the BLOCK because they are
1105 found in the FUNCTION_DECL instead. */
1107 BLOCK_VARS (block) = 0;
1109 /* Clear out the definitions of all label names,
1110 since their scopes end here,
1111 and add them to BLOCK_VARS. */
1113 for (link = named_labels; link; link = TREE_CHAIN (link))
1115 register tree label = TREE_VALUE (link);
1117 if (DECL_INITIAL (label) == 0)
1119 error_with_decl (label, "label `%s' used but not defined");
1120 /* Avoid crashing later. */
1121 define_label (input_filename, lineno,
1124 else if (warn_unused_label && !TREE_USED (label))
1125 warning_with_decl (label, "label `%s' defined but not used");
1126 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1128 /* Put the labels into the "variables" of the
1129 top-level block, so debugger can see them. */
1130 TREE_CHAIN (label) = BLOCK_VARS (block);
1131 BLOCK_VARS (block) = label;
1135 /* Pop the current level, and free the structure for reuse. */
1138 register struct binding_level *level = current_binding_level;
1139 current_binding_level = current_binding_level->level_chain;
1141 level->level_chain = free_binding_level;
1142 free_binding_level = level;
1145 /* Dispose of the block that we just made inside some higher level. */
1147 DECL_INITIAL (current_function_decl) = block;
1150 if (!block_previously_created)
1151 current_binding_level->blocks
1152 = chainon (current_binding_level->blocks, block);
1154 /* If we did not make a block for the level just exited,
1155 any blocks made for inner levels
1156 (since they cannot be recorded as subblocks in that level)
1157 must be carried forward so they will later become subblocks
1158 of something else. */
1160 current_binding_level->blocks
1161 = chainon (current_binding_level->blocks, subblocks);
1163 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1164 binding contour so that they point to the appropriate construct, i.e.
1165 either to the current FUNCTION_DECL node, or else to the BLOCK node
1166 we just constructed.
1168 Note that for tagged types whose scope is just the formal parameter
1169 list for some function type specification, we can't properly set
1170 their TYPE_CONTEXTs here, because we don't have a pointer to the
1171 appropriate FUNCTION_TYPE node readily available to us. For those
1172 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1173 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1174 node which will represent the "scope" for these "parameter list local"
1179 for (link = tags; link; link = TREE_CHAIN (link))
1180 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1182 for (link = tags; link; link = TREE_CHAIN (link))
1183 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1186 TREE_USED (block) = 1;
1190 /* Delete the node BLOCK from the current binding level.
1191 This is used for the block inside a stmt expr ({...})
1192 so that the block can be reinserted where appropriate. */
1195 delete_block (block)
1199 if (current_binding_level->blocks == block)
1200 current_binding_level->blocks = TREE_CHAIN (block);
1201 for (t = current_binding_level->blocks; t;)
1203 if (TREE_CHAIN (t) == block)
1204 TREE_CHAIN (t) = TREE_CHAIN (block);
1208 TREE_CHAIN (block) = NULL;
1209 /* Clear TREE_USED which is always set by poplevel.
1210 The flag is set again if insert_block is called. */
1211 TREE_USED (block) = 0;
1214 /* Insert BLOCK at the end of the list of subblocks of the
1215 current binding level. This is used when a BIND_EXPR is expanded,
1216 to handle the BLOCK node inside the BIND_EXPR. */
1219 insert_block (block)
1222 TREE_USED (block) = 1;
1223 current_binding_level->blocks
1224 = chainon (current_binding_level->blocks, block);
1227 /* Set the BLOCK node for the innermost scope
1228 (the one we are currently in). */
1232 register tree block;
1234 current_binding_level->this_block = block;
1240 register struct binding_level *newlevel;
1242 /* Reuse or create a struct for this binding level. */
1244 if (free_binding_level)
1246 newlevel = free_binding_level;
1247 free_binding_level = free_binding_level->level_chain;
1251 newlevel = make_binding_level ();
1254 /* Add this level to the front of the chain (stack) of label levels. */
1256 newlevel->level_chain = label_level_chain;
1257 label_level_chain = newlevel;
1259 newlevel->names = named_labels;
1260 newlevel->shadowed = shadowed_labels;
1262 shadowed_labels = 0;
1268 register struct binding_level *level = label_level_chain;
1271 /* Clear out the definitions of the declared labels in this level.
1272 Leave in the list any ordinary, non-declared labels. */
1273 for (link = named_labels, prev = 0; link;)
1275 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1277 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1279 error_with_decl (TREE_VALUE (link),
1280 "label `%s' used but not defined");
1281 /* Avoid crashing later. */
1282 define_label (input_filename, lineno,
1283 DECL_NAME (TREE_VALUE (link)));
1285 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1286 warning_with_decl (TREE_VALUE (link),
1287 "label `%s' defined but not used");
1288 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1290 /* Delete this element from the list. */
1291 link = TREE_CHAIN (link);
1293 TREE_CHAIN (prev) = link;
1295 named_labels = link;
1300 link = TREE_CHAIN (link);
1304 /* Bring back all the labels that were shadowed. */
1305 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1306 if (DECL_NAME (TREE_VALUE (link)) != 0)
1307 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1308 = TREE_VALUE (link);
1310 named_labels = chainon (named_labels, level->names);
1311 shadowed_labels = level->shadowed;
1313 /* Pop the current level, and free the structure for reuse. */
1314 label_level_chain = label_level_chain->level_chain;
1315 level->level_chain = free_binding_level;
1316 free_binding_level = level;
1319 /* Push a definition or a declaration of struct, union or enum tag "name".
1320 "type" should be the type node.
1321 We assume that the tag "name" is not already defined.
1323 Note that the definition may really be just a forward reference.
1324 In that case, the TYPE_SIZE will be zero. */
1327 pushtag (name, type)
1330 register struct binding_level *b;
1332 /* Find the proper binding level for this type tag. */
1334 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1339 /* Record the identifier as the type's name if it has none. */
1341 if (TYPE_NAME (type) == 0)
1342 TYPE_NAME (type) = name;
1345 b->tags = tree_cons (name, type, b->tags);
1347 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1348 tagged type we just added to the current binding level. This fake
1349 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1350 to output a representation of a tagged type, and it also gives
1351 us a convenient place to record the "scope start" address for the
1354 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1356 /* An approximation for now, so we can tell this is a function-scope tag.
1357 This will be updated in poplevel. */
1358 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1361 /* Handle when a new declaration NEWDECL
1362 has the same name as an old one OLDDECL
1363 in the same binding contour.
1364 Prints an error message if appropriate.
1366 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1367 Otherwise, return 0.
1369 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1370 and OLDDECL is in an outer binding level and should thus not be changed. */
1373 duplicate_decls (newdecl, olddecl, different_binding_level)
1374 register tree newdecl, olddecl;
1375 int different_binding_level;
1377 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1378 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1379 && DECL_INITIAL (newdecl) != 0);
1380 tree oldtype = TREE_TYPE (olddecl);
1381 tree newtype = TREE_TYPE (newdecl);
1384 if (DECL_P (olddecl))
1385 DECL_MACHINE_ATTRIBUTES (newdecl)
1386 = merge_machine_decl_attributes (olddecl, newdecl);
1388 if (TREE_CODE (newtype) == ERROR_MARK
1389 || TREE_CODE (oldtype) == ERROR_MARK)
1392 /* New decl is completely inconsistent with the old one =>
1393 tell caller to replace the old one.
1394 This is always an error except in the case of shadowing a builtin. */
1395 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1397 if (TREE_CODE (olddecl) == FUNCTION_DECL
1398 && (DECL_BUILT_IN (olddecl)
1399 || DECL_BUILT_IN_NONANSI (olddecl)))
1401 /* If you declare a built-in or predefined function name as static,
1402 the old definition is overridden,
1403 but optionally warn this was a bad choice of name. */
1404 if (!TREE_PUBLIC (newdecl))
1408 else if (DECL_BUILT_IN (olddecl))
1409 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1411 warning_with_decl (newdecl, "shadowing library function `%s'");
1413 /* Likewise, if the built-in is not ansi, then programs can
1414 override it even globally without an error. */
1415 else if (! DECL_BUILT_IN (olddecl))
1416 warning_with_decl (newdecl,
1417 "library function `%s' declared as non-function");
1419 else if (DECL_BUILT_IN_NONANSI (olddecl))
1420 warning_with_decl (newdecl,
1421 "built-in function `%s' declared as non-function");
1423 warning_with_decl (newdecl,
1424 "built-in function `%s' declared as non-function");
1428 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1429 error_with_decl (olddecl, "previous declaration of `%s'");
1435 /* For real parm decl following a forward decl,
1436 return 1 so old decl will be reused. */
1437 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1438 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1441 /* The new declaration is the same kind of object as the old one.
1442 The declarations may partially match. Print warnings if they don't
1443 match enough. Ultimately, copy most of the information from the new
1444 decl to the old one, and keep using the old one. */
1446 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1447 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1448 && DECL_INITIAL (olddecl) == 0)
1449 /* If -traditional, avoid error for redeclaring fcn
1450 after implicit decl. */
1452 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1453 && DECL_BUILT_IN (olddecl))
1455 /* A function declaration for a built-in function. */
1456 if (!TREE_PUBLIC (newdecl))
1458 /* If you declare a built-in function name as static, the
1459 built-in definition is overridden,
1460 but optionally warn this was a bad choice of name. */
1462 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1463 /* Discard the old built-in function. */
1466 else if (!types_match)
1468 /* Accept the return type of the new declaration if same modes. */
1469 tree oldreturntype = TREE_TYPE (oldtype);
1470 tree newreturntype = TREE_TYPE (newtype);
1472 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1474 /* Function types may be shared, so we can't just modify
1475 the return type of olddecl's function type. */
1477 = build_function_type (newreturntype,
1478 TYPE_ARG_TYPES (oldtype));
1480 types_match = comptypes (newtype, trytype);
1484 /* Accept harmless mismatch in first argument type also.
1486 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1487 && TYPE_ARG_TYPES (oldtype) != 0
1488 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1489 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1490 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1491 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1493 /* Function types may be shared, so we can't just modify
1494 the return type of olddecl's function type. */
1496 = build_function_type (TREE_TYPE (oldtype),
1497 tree_cons (NULL_TREE,
1498 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1499 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1501 types_match = comptypes (newtype, trytype);
1505 if (! different_binding_level)
1506 TREE_TYPE (olddecl) = oldtype;
1510 /* If types don't match for a built-in, throw away the built-in. */
1511 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1515 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1516 && DECL_SOURCE_LINE (olddecl) == 0)
1518 /* A function declaration for a predeclared function
1519 that isn't actually built in. */
1520 if (!TREE_PUBLIC (newdecl))
1522 /* If you declare it as static, the
1523 default definition is overridden. */
1526 else if (!types_match)
1528 /* If the types don't match, preserve volatility indication.
1529 Later on, we will discard everything else about the
1530 default declaration. */
1531 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1534 /* Permit char *foo () to match void *foo (...) if not pedantic,
1535 if one of them came from a system header file. */
1536 else if (!types_match
1537 && TREE_CODE (olddecl) == FUNCTION_DECL
1538 && TREE_CODE (newdecl) == FUNCTION_DECL
1539 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1540 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1541 && (DECL_IN_SYSTEM_HEADER (olddecl)
1542 || DECL_IN_SYSTEM_HEADER (newdecl))
1543 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1544 && TYPE_ARG_TYPES (oldtype) == 0
1545 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1546 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1548 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1549 && TYPE_ARG_TYPES (newtype) == 0
1550 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1551 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1554 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1555 /* Make sure we keep void * as ret type, not char *. */
1556 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1557 TREE_TYPE (newdecl) = newtype = oldtype;
1559 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1560 we will come back here again. */
1561 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1563 else if (!types_match
1564 /* Permit char *foo (int, ...); followed by char *foo ();
1566 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1568 /* Return types must still match. */
1569 && comptypes (TREE_TYPE (oldtype),
1570 TREE_TYPE (newtype))
1571 && TYPE_ARG_TYPES (newtype) == 0))
1573 error_with_decl (newdecl, "conflicting types for `%s'");
1574 /* Check for function type mismatch
1575 involving an empty arglist vs a nonempty one. */
1576 if (TREE_CODE (olddecl) == FUNCTION_DECL
1577 && comptypes (TREE_TYPE (oldtype),
1578 TREE_TYPE (newtype))
1579 && ((TYPE_ARG_TYPES (oldtype) == 0
1580 && DECL_INITIAL (olddecl) == 0)
1582 (TYPE_ARG_TYPES (newtype) == 0
1583 && DECL_INITIAL (newdecl) == 0)))
1585 /* Classify the problem further. */
1586 register tree t = TYPE_ARG_TYPES (oldtype);
1588 t = TYPE_ARG_TYPES (newtype);
1589 for (; t; t = TREE_CHAIN (t))
1591 register tree type = TREE_VALUE (t);
1593 if (TREE_CHAIN (t) == 0
1594 && TYPE_MAIN_VARIANT (type) != void_type_node)
1596 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1600 if (simple_type_promotes_to (type) != NULL_TREE)
1602 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1607 error_with_decl (olddecl, "previous declaration of `%s'");
1611 errmsg = redeclaration_error_message (newdecl, olddecl);
1617 error_with_decl (newdecl, "redefinition of `%s'");
1620 error_with_decl (newdecl, "redeclaration of `%s'");
1623 error_with_decl (newdecl, "conflicting declarations of `%s'");
1629 error_with_decl (olddecl,
1630 ((DECL_INITIAL (olddecl)
1631 && current_binding_level == global_binding_level)
1632 ? "`%s' previously defined here"
1633 : "`%s' previously declared here"));
1635 else if (TREE_CODE (newdecl) == TYPE_DECL
1636 && (DECL_IN_SYSTEM_HEADER (olddecl)
1637 || DECL_IN_SYSTEM_HEADER (newdecl)))
1639 warning_with_decl (newdecl, "redefinition of `%s'");
1642 ((DECL_INITIAL (olddecl)
1643 && current_binding_level == global_binding_level)
1644 ? "`%s' previously defined here"
1645 : "`%s' previously declared here"));
1647 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1648 && DECL_INITIAL (olddecl) != 0
1649 && TYPE_ARG_TYPES (oldtype) == 0
1650 && TYPE_ARG_TYPES (newtype) != 0
1651 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1653 register tree type, parm;
1655 /* Prototype decl follows defn w/o prototype. */
1657 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1658 type = TYPE_ARG_TYPES (newtype),
1661 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1663 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1664 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1666 warning_with_decl (newdecl, "prototype for `%s' follows");
1667 warning_with_decl (olddecl, "non-prototype definition here");
1670 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1671 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1673 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1674 error_with_decl (olddecl, "non-prototype definition here");
1678 /* Type for passing arg must be consistent
1679 with that declared for the arg. */
1680 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1681 /* If -traditional, allow `unsigned int' instead of `int'
1682 in the prototype. */
1683 && (! (flag_traditional
1684 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1685 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1687 error_with_decl (newdecl,
1688 "prototype for `%s' follows and argument %d doesn't match",
1690 error_with_decl (olddecl, "non-prototype definition here");
1696 /* Warn about mismatches in various flags. */
1699 /* Warn if function is now inline
1700 but was previously declared not inline and has been called. */
1701 if (TREE_CODE (olddecl) == FUNCTION_DECL
1702 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1703 && TREE_USED (olddecl))
1704 warning_with_decl (newdecl,
1705 "`%s' declared inline after being called");
1706 if (TREE_CODE (olddecl) == FUNCTION_DECL
1707 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1708 && DECL_INITIAL (olddecl) != 0)
1709 warning_with_decl (newdecl,
1710 "`%s' declared inline after its definition");
1712 /* If pedantic, warn when static declaration follows a non-static
1713 declaration. Otherwise, do so only for functions. */
1714 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1715 && TREE_PUBLIC (olddecl)
1716 && !TREE_PUBLIC (newdecl))
1717 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1719 /* If warn_traditional, warn when a non-static function
1720 declaration follows a static one. */
1721 if (warn_traditional
1722 && TREE_CODE (olddecl) == FUNCTION_DECL
1723 && !TREE_PUBLIC (olddecl)
1724 && TREE_PUBLIC (newdecl))
1725 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1727 /* Warn when const declaration follows a non-const
1728 declaration, but not for functions. */
1729 if (TREE_CODE (olddecl) != FUNCTION_DECL
1730 && !TREE_READONLY (olddecl)
1731 && TREE_READONLY (newdecl))
1732 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1733 /* These bits are logically part of the type, for variables.
1734 But not for functions
1735 (where qualifiers are not valid ANSI anyway). */
1736 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1737 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1738 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1739 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1743 /* Optionally warn about more than one declaration for the same name. */
1744 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1745 /* Don't warn about a function declaration
1746 followed by a definition. */
1747 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1748 && DECL_INITIAL (olddecl) == 0)
1749 /* Don't warn about extern decl followed by (tentative) definition. */
1750 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1752 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1753 warning_with_decl (olddecl, "previous declaration of `%s'");
1756 /* Copy all the DECL_... slots specified in the new decl
1757 except for any that we copy here from the old type.
1759 Past this point, we don't change OLDTYPE and NEWTYPE
1760 even if we change the types of NEWDECL and OLDDECL. */
1764 /* When copying info to olddecl, we store into write_olddecl
1765 instead. This allows us to avoid modifying olddecl when
1766 different_binding_level is true. */
1767 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1769 /* Merge the data types specified in the two decls. */
1770 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1772 if (different_binding_level)
1774 = build_type_attribute_variant
1776 merge_attributes (TYPE_ATTRIBUTES (newtype),
1777 TYPE_ATTRIBUTES (oldtype)));
1780 = TREE_TYPE (olddecl)
1781 = common_type (newtype, oldtype);
1784 /* Lay the type out, unless already done. */
1785 if (oldtype != TREE_TYPE (newdecl))
1787 if (TREE_TYPE (newdecl) != error_mark_node)
1788 layout_type (TREE_TYPE (newdecl));
1789 if (TREE_CODE (newdecl) != FUNCTION_DECL
1790 && TREE_CODE (newdecl) != TYPE_DECL
1791 && TREE_CODE (newdecl) != CONST_DECL)
1792 layout_decl (newdecl, 0);
1796 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1797 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1798 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1799 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1800 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1801 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1802 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1805 /* Keep the old rtl since we can safely use it. */
1806 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1808 /* Merge the type qualifiers. */
1809 if (TREE_CODE (olddecl) == FUNCTION_DECL
1810 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1811 && ! TREE_THIS_VOLATILE (newdecl))
1812 TREE_THIS_VOLATILE (write_olddecl) = 0;
1814 if (TREE_READONLY (newdecl))
1815 TREE_READONLY (write_olddecl) = 1;
1817 if (TREE_THIS_VOLATILE (newdecl))
1819 TREE_THIS_VOLATILE (write_olddecl) = 1;
1820 if (TREE_CODE (newdecl) == VAR_DECL)
1821 make_var_volatile (newdecl);
1824 /* Keep source location of definition rather than declaration. */
1825 /* When called with different_binding_level set, keep the old
1826 information so that meaningful diagnostics can be given. */
1827 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1828 && ! different_binding_level)
1830 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1831 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1834 /* Merge the unused-warning information. */
1835 if (DECL_IN_SYSTEM_HEADER (olddecl))
1836 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1837 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1838 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1840 /* Merge the initialization information. */
1841 /* When called with different_binding_level set, don't copy over
1842 DECL_INITIAL, so that we don't accidentally change function
1843 declarations into function definitions. */
1844 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1845 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1847 /* Merge the section attribute.
1848 We want to issue an error if the sections conflict but that must be
1849 done later in decl_attributes since we are called before attributes
1851 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1852 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1854 /* Copy the assembler name.
1855 Currently, it can only be defined in the prototype. */
1856 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1858 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1860 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1861 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1863 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1864 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1865 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1866 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1867 DECL_NO_LIMIT_STACK (newdecl)
1868 |= DECL_NO_LIMIT_STACK (olddecl);
1871 /* If cannot merge, then use the new type and qualifiers,
1872 and don't preserve the old rtl. */
1873 else if (! different_binding_level)
1875 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1876 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1877 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1878 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1881 /* Merge the storage class information. */
1882 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1883 /* For functions, static overrides non-static. */
1884 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1886 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1887 /* This is since we don't automatically
1888 copy the attributes of NEWDECL into OLDDECL. */
1889 /* No need to worry about different_binding_level here because
1890 then TREE_PUBLIC (newdecl) was true. */
1891 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1892 /* If this clears `static', clear it in the identifier too. */
1893 if (! TREE_PUBLIC (olddecl))
1894 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1896 if (DECL_EXTERNAL (newdecl))
1898 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1899 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1900 /* An extern decl does not override previous storage class. */
1901 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1902 if (! DECL_EXTERNAL (newdecl))
1903 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1907 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1908 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1911 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1913 /* If either decl says `inline', this fn is inline,
1914 unless its definition was passed already. */
1915 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1916 DECL_INLINE (olddecl) = 1;
1918 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1920 if (DECL_BUILT_IN (olddecl))
1922 /* Get rid of any built-in function if new arg types don't match it
1923 or if we have a function definition. */
1924 if (! types_match || new_is_definition)
1926 if (! different_binding_level)
1928 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1929 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1934 /* If redeclaring a builtin function, and not a definition,
1935 it stays built in. */
1936 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1937 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1940 /* Also preserve various other info from the definition. */
1941 else if (! new_is_definition)
1942 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1943 if (! new_is_definition)
1945 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1946 /* When called with different_binding_level set, don't copy over
1947 DECL_INITIAL, so that we don't accidentally change function
1948 declarations into function definitions. */
1949 if (! different_binding_level)
1950 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1951 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1952 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1953 if (DECL_INLINE (newdecl))
1954 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
1957 if (different_binding_level)
1959 /* Don't output a duplicate symbol or debugging information for this
1962 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1963 just have two declarations without a definition. VAR_DECLs may need
1964 the same treatment, I'm not sure. */
1965 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1966 DECL_IGNORED_P (newdecl) = 1;
1968 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1972 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1973 But preserve OLDDECL's DECL_UID. */
1975 register unsigned olddecl_uid = DECL_UID (olddecl);
1977 bcopy ((char *) newdecl + sizeof (struct tree_common),
1978 (char *) olddecl + sizeof (struct tree_common),
1979 sizeof (struct tree_decl) - sizeof (struct tree_common));
1980 DECL_UID (olddecl) = olddecl_uid;
1983 /* NEWDECL contains the merged attribute lists.
1984 Update OLDDECL to be the same. */
1985 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
1990 /* Record a decl-node X as belonging to the current lexical scope.
1991 Check for errors (such as an incompatible declaration for the same
1992 name already seen in the same scope).
1994 Returns either X or an old decl for the same name.
1995 If an old decl is returned, it may have been smashed
1996 to agree with what X says. */
2003 register tree name = DECL_NAME (x);
2004 register struct binding_level *b = current_binding_level;
2006 DECL_CONTEXT (x) = current_function_decl;
2007 /* A local extern declaration for a function doesn't constitute nesting.
2008 A local auto declaration does, since it's a forward decl
2009 for a nested function coming later. */
2010 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2011 && DECL_EXTERNAL (x))
2012 DECL_CONTEXT (x) = 0;
2014 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2015 && x != IDENTIFIER_IMPLICIT_DECL (name)
2016 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2017 && !DECL_IN_SYSTEM_HEADER (x))
2018 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2024 int different_binding_level = 0;
2026 t = lookup_name_current_level (name);
2027 /* Don't type check externs here when -traditional. This is so that
2028 code with conflicting declarations inside blocks will get warnings
2029 not errors. X11 for instance depends on this. */
2030 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2032 t = IDENTIFIER_GLOBAL_VALUE (name);
2033 /* Type decls at global scope don't conflict with externs declared
2034 inside lexical blocks. */
2035 if (t && TREE_CODE (t) == TYPE_DECL)
2037 different_binding_level = 1;
2039 if (t != 0 && t == error_mark_node)
2040 /* error_mark_node is 0 for a while during initialization! */
2043 error_with_decl (x, "`%s' used prior to declaration");
2048 file = DECL_SOURCE_FILE (t);
2049 line = DECL_SOURCE_LINE (t);
2052 /* If this decl is `static' and an implicit decl was seen previously,
2053 warn. But don't complain if -traditional,
2054 since traditional compilers don't complain. */
2055 if (! flag_traditional && TREE_PUBLIC (name)
2056 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2057 sets this for all functions. */
2058 && ! TREE_PUBLIC (x)
2059 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2060 /* We used to warn also for explicit extern followed by static,
2061 but sometimes you need to do it that way. */
2062 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2064 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2065 IDENTIFIER_POINTER (name));
2066 pedwarn_with_file_and_line
2067 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2068 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2069 "previous declaration of `%s'",
2070 IDENTIFIER_POINTER (name));
2071 TREE_THIS_VOLATILE (name) = 1;
2074 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2076 if (TREE_CODE (t) == PARM_DECL)
2078 /* Don't allow more than one "real" duplicate
2079 of a forward parm decl. */
2080 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2086 /* If we are processing a typedef statement, generate a whole new
2087 ..._TYPE node (which will be just an variant of the existing
2088 ..._TYPE node with identical properties) and then install the
2089 TYPE_DECL node generated to represent the typedef name as the
2090 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2092 The whole point here is to end up with a situation where each
2093 and every ..._TYPE node the compiler creates will be uniquely
2094 associated with AT MOST one node representing a typedef name.
2095 This way, even though the compiler substitutes corresponding
2096 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2097 early on, later parts of the compiler can always do the reverse
2098 translation and get back the corresponding typedef name. For
2101 typedef struct S MY_TYPE;
2104 Later parts of the compiler might only know that `object' was of
2105 type `struct S' if it were not for code just below. With this
2106 code however, later parts of the compiler see something like:
2108 struct S' == struct S
2109 typedef struct S' MY_TYPE;
2112 And they can then deduce (from the node for type struct S') that
2113 the original object declaration was:
2117 Being able to do this is important for proper support of protoize,
2118 and also for generating precise symbolic debugging information
2119 which takes full account of the programmer's (typedef) vocabulary.
2121 Obviously, we don't want to generate a duplicate ..._TYPE node if
2122 the TYPE_DECL node that we are now processing really represents a
2123 standard built-in type.
2125 Since all standard types are effectively declared at line zero
2126 in the source file, we can easily check to see if we are working
2127 on a standard type by checking the current value of lineno. */
2129 if (TREE_CODE (x) == TYPE_DECL)
2131 if (DECL_SOURCE_LINE (x) == 0)
2133 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2134 TYPE_NAME (TREE_TYPE (x)) = x;
2136 else if (TREE_TYPE (x) != error_mark_node
2137 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2139 tree tt = TREE_TYPE (x);
2140 DECL_ORIGINAL_TYPE (x) = tt;
2141 tt = build_type_copy (tt);
2143 TREE_USED (tt) = TREE_USED (x);
2148 /* Multiple external decls of the same identifier ought to match.
2149 Check against both global declarations (when traditional) and out of
2150 scope (limbo) block level declarations.
2152 We get warnings about inline functions where they are defined.
2153 Avoid duplicate warnings where they are used. */
2155 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2159 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2160 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2161 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2162 decl = IDENTIFIER_GLOBAL_VALUE (name);
2163 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2164 /* Decls in limbo are always extern, so no need to check that. */
2165 decl = IDENTIFIER_LIMBO_VALUE (name);
2169 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2170 /* If old decl is built-in, we already warned if we should. */
2171 && !DECL_BUILT_IN (decl))
2173 pedwarn_with_decl (x,
2174 "type mismatch with previous external decl");
2175 pedwarn_with_decl (decl, "previous external decl of `%s'");
2179 /* If a function has had an implicit declaration, and then is defined,
2180 make sure they are compatible. */
2182 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2183 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2184 && TREE_CODE (x) == FUNCTION_DECL
2185 && ! comptypes (TREE_TYPE (x),
2186 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2188 warning_with_decl (x, "type mismatch with previous implicit declaration");
2189 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2190 "previous implicit declaration of `%s'");
2193 /* In PCC-compatibility mode, extern decls of vars with no current decl
2194 take effect at top level no matter where they are. */
2195 if (flag_traditional && DECL_EXTERNAL (x)
2196 && lookup_name (name) == 0)
2198 tree type = TREE_TYPE (x);
2200 /* But don't do this if the type contains temporary nodes. */
2203 if (type == error_mark_node)
2205 if (TYPE_CONTEXT (type))
2207 warning_with_decl (x, "type of external `%s' is not global");
2208 /* By exiting the loop early, we leave TYPE nonzero,
2209 and thus prevent globalization of the decl. */
2212 else if (TREE_CODE (type) == FUNCTION_TYPE
2213 && TYPE_ARG_TYPES (type) != 0)
2214 /* The types might not be truly local,
2215 but the list of arg types certainly is temporary.
2216 Since prototypes are nontraditional,
2217 ok not to do the traditional thing. */
2219 type = TREE_TYPE (type);
2223 b = global_binding_level;
2226 /* This name is new in its binding level.
2227 Install the new declaration and return it. */
2228 if (b == global_binding_level)
2230 /* Install a global value. */
2232 /* If the first global decl has external linkage,
2233 warn if we later see static one. */
2234 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2235 TREE_PUBLIC (name) = 1;
2237 IDENTIFIER_GLOBAL_VALUE (name) = x;
2239 /* We no longer care about any previous block level declarations. */
2240 IDENTIFIER_LIMBO_VALUE (name) = 0;
2242 /* Don't forget if the function was used via an implicit decl. */
2243 if (IDENTIFIER_IMPLICIT_DECL (name)
2244 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2245 TREE_USED (x) = 1, TREE_USED (name) = 1;
2247 /* Don't forget if its address was taken in that way. */
2248 if (IDENTIFIER_IMPLICIT_DECL (name)
2249 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2250 TREE_ADDRESSABLE (x) = 1;
2252 /* Warn about mismatches against previous implicit decl. */
2253 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2254 /* If this real decl matches the implicit, don't complain. */
2255 && ! (TREE_CODE (x) == FUNCTION_DECL
2256 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2257 == integer_type_node)))
2258 pedwarn ("`%s' was previously implicitly declared to return `int'",
2259 IDENTIFIER_POINTER (name));
2261 /* If this decl is `static' and an `extern' was seen previously,
2262 that is erroneous. */
2263 if (TREE_PUBLIC (name)
2264 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2266 /* Okay to redeclare an ANSI built-in as static. */
2267 if (t != 0 && DECL_BUILT_IN (t))
2269 /* Okay to declare a non-ANSI built-in as anything. */
2270 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2272 /* Okay to have global type decl after an earlier extern
2273 declaration inside a lexical block. */
2274 else if (TREE_CODE (x) == TYPE_DECL)
2276 else if (IDENTIFIER_IMPLICIT_DECL (name))
2278 if (! TREE_THIS_VOLATILE (name))
2279 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2280 IDENTIFIER_POINTER (name));
2283 pedwarn ("`%s' was declared `extern' and later `static'",
2284 IDENTIFIER_POINTER (name));
2289 /* Here to install a non-global value. */
2290 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2291 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2293 IDENTIFIER_LOCAL_VALUE (name) = x;
2295 /* If this is an extern function declaration, see if we
2296 have a global definition or declaration for the function. */
2299 && TREE_CODE (x) == FUNCTION_DECL
2300 && TREE_CODE (oldglobal) == FUNCTION_DECL
2301 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2303 /* We have one. Their types must agree. */
2304 if (! comptypes (TREE_TYPE (x),
2305 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2306 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2309 /* Inner extern decl is inline if global one is.
2310 Copy enough to really inline it. */
2311 if (DECL_INLINE (oldglobal))
2313 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2314 DECL_INITIAL (x) = (current_function_decl == oldglobal
2315 ? 0 : DECL_INITIAL (oldglobal));
2316 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2317 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2318 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2319 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2320 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2321 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2323 /* Inner extern decl is built-in if global one is. */
2324 if (DECL_BUILT_IN (oldglobal))
2326 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2327 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2329 /* Keep the arg types from a file-scope fcn defn. */
2330 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2331 && DECL_INITIAL (oldglobal)
2332 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2333 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2337 #if 0 /* This case is probably sometimes the right thing to do. */
2338 /* If we have a local external declaration,
2339 then any file-scope declaration should not
2340 have been static. */
2341 if (oldlocal == 0 && oldglobal != 0
2342 && !TREE_PUBLIC (oldglobal)
2343 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2344 warning ("`%s' locally external but globally static",
2345 IDENTIFIER_POINTER (name));
2348 /* If we have a local external declaration,
2349 and no file-scope declaration has yet been seen,
2350 then if we later have a file-scope decl it must not be static. */
2352 && DECL_EXTERNAL (x)
2356 TREE_PUBLIC (name) = 1;
2358 /* Save this decl, so that we can do type checking against
2359 other decls after it falls out of scope.
2361 Only save it once. This prevents temporary decls created in
2362 expand_inline_function from being used here, since this
2363 will have been set when the inline function was parsed.
2364 It also helps give slightly better warnings. */
2365 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2366 IDENTIFIER_LIMBO_VALUE (name) = x;
2369 /* Warn if shadowing an argument at the top level of the body. */
2370 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2371 /* This warning doesn't apply to the parms of a nested fcn. */
2372 && ! current_binding_level->parm_flag
2373 /* Check that this is one level down from the parms. */
2374 && current_binding_level->level_chain->parm_flag
2375 /* Check that the decl being shadowed
2376 comes from the parm level, one level up. */
2377 && chain_member (oldlocal, current_binding_level->level_chain->names))
2379 if (TREE_CODE (oldlocal) == PARM_DECL)
2380 pedwarn ("declaration of `%s' shadows a parameter",
2381 IDENTIFIER_POINTER (name));
2383 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2384 IDENTIFIER_POINTER (name));
2387 /* Maybe warn if shadowing something else. */
2388 else if (warn_shadow && !DECL_EXTERNAL (x)
2389 /* No shadow warnings for internally generated vars. */
2390 && DECL_SOURCE_LINE (x) != 0
2391 /* No shadow warnings for vars made for inlining. */
2392 && ! DECL_FROM_INLINE (x))
2394 char *id = IDENTIFIER_POINTER (name);
2396 if (TREE_CODE (x) == PARM_DECL
2397 && current_binding_level->level_chain->parm_flag)
2398 /* Don't warn about the parm names in function declarator
2399 within a function declarator.
2400 It would be nice to avoid warning in any function
2401 declarator in a declaration, as opposed to a definition,
2402 but there is no way to tell it's not a definition. */
2404 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2405 warning ("declaration of `%s' shadows a parameter", id);
2406 else if (oldlocal != 0)
2407 warning ("declaration of `%s' shadows previous local", id);
2408 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2409 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2410 warning ("declaration of `%s' shadows global declaration", id);
2413 /* If storing a local value, there may already be one (inherited).
2414 If so, record it for restoration when this binding level ends. */
2416 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2419 /* Keep count of variables in this level with incomplete type. */
2420 if (!COMPLETE_TYPE_P (TREE_TYPE (x)))
2424 /* Put decls on list in reverse order.
2425 We will reverse them later if necessary. */
2426 TREE_CHAIN (x) = b->names;
2432 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2435 pushdecl_top_level (x)
2439 register struct binding_level *b = current_binding_level;
2441 current_binding_level = global_binding_level;
2443 current_binding_level = b;
2447 /* Generate an implicit declaration for identifier FUNCTIONID
2448 as a function of type int (). Print a warning if appropriate. */
2451 implicitly_declare (functionid)
2455 int traditional_warning = 0;
2456 /* Only one "implicit declaration" warning per identifier. */
2457 int implicit_warning;
2459 /* We used to reuse an old implicit decl here,
2460 but this loses with inline functions because it can clobber
2461 the saved decl chains. */
2462 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2463 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2465 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2467 /* Warn of implicit decl following explicit local extern decl.
2468 This is probably a program designed for traditional C. */
2469 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2470 traditional_warning = 1;
2472 /* Warn once of an implicit declaration. */
2473 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2475 DECL_EXTERNAL (decl) = 1;
2476 TREE_PUBLIC (decl) = 1;
2478 /* Record that we have an implicit decl and this is it. */
2479 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2481 /* ANSI standard says implicit declarations are in the innermost block.
2482 So we record the decl in the standard fashion.
2483 If flag_traditional is set, pushdecl does it top-level. */
2486 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2487 maybe_objc_check_decl (decl);
2489 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2491 if (mesg_implicit_function_declaration && implicit_warning)
2493 if (mesg_implicit_function_declaration == 2)
2494 error ("implicit declaration of function `%s'",
2495 IDENTIFIER_POINTER (functionid));
2497 warning ("implicit declaration of function `%s'",
2498 IDENTIFIER_POINTER (functionid));
2500 else if (warn_traditional && traditional_warning)
2501 warning ("function `%s' was previously declared within a block",
2502 IDENTIFIER_POINTER (functionid));
2504 /* Write a record describing this implicit function declaration to the
2505 prototypes file (if requested). */
2507 gen_aux_info_record (decl, 0, 1, 0);
2512 /* Return zero if the declaration NEWDECL is valid
2513 when the declaration OLDDECL (assumed to be for the same name)
2514 has already been seen.
2515 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2516 and 3 if it is a conflicting declaration. */
2519 redeclaration_error_message (newdecl, olddecl)
2520 tree newdecl, olddecl;
2522 if (TREE_CODE (newdecl) == TYPE_DECL)
2524 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2526 /* pushdecl creates distinct types for TYPE_DECLs by calling
2527 build_type_copy, so the above comparison generally fails. We do
2528 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2529 is equivalent to what this code used to do before the build_type_copy
2530 call. The variant type distinction should not matter for traditional
2531 code, because it doesn't have type qualifiers. */
2532 if (flag_traditional
2533 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2535 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2539 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2541 /* Declarations of functions can insist on internal linkage
2542 but they can't be inconsistent with internal linkage,
2543 so there can be no error on that account.
2544 However defining the same name twice is no good. */
2545 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2546 /* However, defining once as extern inline and a second
2547 time in another way is ok. */
2548 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2549 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2553 else if (current_binding_level == global_binding_level)
2555 /* Objects declared at top level: */
2556 /* If at least one is a reference, it's ok. */
2557 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2559 /* Reject two definitions. */
2560 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2562 /* Now we have two tentative defs, or one tentative and one real def. */
2563 /* Insist that the linkage match. */
2564 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2568 else if (current_binding_level->parm_flag
2569 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2573 /* Newdecl has block scope. If olddecl has block scope also, then
2574 reject two definitions, and reject a definition together with an
2575 external reference. Otherwise, it is OK, because newdecl must
2576 be an extern reference to olddecl. */
2577 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2578 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2584 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2585 Create one if none exists so far for the current function.
2586 This function is called for both label definitions and label references. */
2592 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (current_function_decl == 0)
2596 error ("label %s referenced outside of any function",
2597 IDENTIFIER_POINTER (id));
2601 /* Use a label already defined or ref'd with this name. */
2604 /* But not if it is inherited and wasn't declared to be inheritable. */
2605 if (DECL_CONTEXT (decl) != current_function_decl
2606 && ! C_DECLARED_LABEL_FLAG (decl))
2607 return shadow_label (id);
2611 decl = build_decl (LABEL_DECL, id, void_type_node);
2613 /* Make sure every label has an rtx. */
2616 /* A label not explicitly declared must be local to where it's ref'd. */
2617 DECL_CONTEXT (decl) = current_function_decl;
2619 DECL_MODE (decl) = VOIDmode;
2621 /* Say where one reference is to the label,
2622 for the sake of the error if it is not defined. */
2623 DECL_SOURCE_LINE (decl) = lineno;
2624 DECL_SOURCE_FILE (decl) = input_filename;
2626 IDENTIFIER_LABEL_VALUE (id) = decl;
2628 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2633 /* Make a label named NAME in the current function,
2634 shadowing silently any that may be inherited from containing functions
2635 or containing scopes.
2637 Note that valid use, if the label being shadowed
2638 comes from another scope in the same function,
2639 requires calling declare_nonlocal_label right away. */
2645 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2651 /* Check to make sure that the label hasn't already been declared
2652 at this label scope */
2653 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2654 if (TREE_VALUE (dup) == decl)
2656 error ("duplicate label declaration `%s'",
2657 IDENTIFIER_POINTER (name));
2658 error_with_decl (TREE_VALUE (dup),
2659 "this is a previous declaration");
2660 /* Just use the previous declaration. */
2661 return lookup_label (name);
2664 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2665 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2668 return lookup_label (name);
2671 /* Define a label, specifying the location in the source file.
2672 Return the LABEL_DECL node for the label, if the definition is valid.
2673 Otherwise return 0. */
2676 define_label (filename, line, name)
2677 const char *filename;
2681 tree decl = lookup_label (name);
2683 /* If label with this name is known from an outer context, shadow it. */
2684 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2686 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2687 IDENTIFIER_LABEL_VALUE (name) = 0;
2688 decl = lookup_label (name);
2691 if (DECL_INITIAL (decl) != 0)
2693 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2698 /* Mark label as having been defined. */
2699 DECL_INITIAL (decl) = error_mark_node;
2700 /* Say where in the source. */
2701 DECL_SOURCE_FILE (decl) = filename;
2702 DECL_SOURCE_LINE (decl) = line;
2707 /* Return the list of declarations of the current level.
2708 Note that this list is in reverse order unless/until
2709 you nreverse it; and when you do nreverse it, you must
2710 store the result back using `storedecls' or you will lose. */
2715 return current_binding_level->names;
2718 /* Return the list of type-tags (for structs, etc) of the current level. */
2723 return current_binding_level->tags;
2726 /* Store the list of declarations of the current level.
2727 This is done for the parameter declarations of a function being defined,
2728 after they are modified in the light of any missing parameters. */
2734 current_binding_level->names = decls;
2737 /* Similarly, store the list of tags of the current level. */
2743 current_binding_level->tags = tags;
2746 /* Given NAME, an IDENTIFIER_NODE,
2747 return the structure (or union or enum) definition for that name.
2748 Searches binding levels from BINDING_LEVEL up to the global level.
2749 If THISLEVEL_ONLY is nonzero, searches only the specified context
2750 (but skips any tag-transparent contexts to find one that is
2751 meaningful for tags).
2752 CODE says which kind of type the caller wants;
2753 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2754 If the wrong kind of type is found, an error is reported. */
2757 lookup_tag (code, name, binding_level, thislevel_only)
2758 enum tree_code code;
2759 struct binding_level *binding_level;
2763 register struct binding_level *level;
2765 for (level = binding_level; level; level = level->level_chain)
2768 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2770 if (TREE_PURPOSE (tail) == name)
2772 if (TREE_CODE (TREE_VALUE (tail)) != code)
2774 /* Definition isn't the kind we were looking for. */
2775 pending_invalid_xref = name;
2776 pending_invalid_xref_file = input_filename;
2777 pending_invalid_xref_line = lineno;
2779 return TREE_VALUE (tail);
2782 if (thislevel_only && ! level->tag_transparent)
2788 /* Print an error message now
2789 for a recent invalid struct, union or enum cross reference.
2790 We don't print them immediately because they are not invalid
2791 when used in the `struct foo;' construct for shadowing. */
2794 pending_xref_error ()
2796 if (pending_invalid_xref != 0)
2797 error_with_file_and_line (pending_invalid_xref_file,
2798 pending_invalid_xref_line,
2799 "`%s' defined as wrong kind of tag",
2800 IDENTIFIER_POINTER (pending_invalid_xref));
2801 pending_invalid_xref = 0;
2804 /* Given a type, find the tag that was defined for it and return the tag name.
2805 Otherwise return 0. */
2808 lookup_tag_reverse (type)
2811 register struct binding_level *level;
2813 for (level = current_binding_level; level; level = level->level_chain)
2816 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2818 if (TREE_VALUE (tail) == type)
2819 return TREE_PURPOSE (tail);
2825 /* Look up NAME in the current binding level and its superiors
2826 in the namespace of variables, functions and typedefs.
2827 Return a ..._DECL node of some kind representing its definition,
2828 or return 0 if it is undefined. */
2835 if (current_binding_level != global_binding_level
2836 && IDENTIFIER_LOCAL_VALUE (name))
2837 val = IDENTIFIER_LOCAL_VALUE (name);
2839 val = IDENTIFIER_GLOBAL_VALUE (name);
2843 /* Similar to `lookup_name' but look only at current binding level. */
2846 lookup_name_current_level (name)
2851 if (current_binding_level == global_binding_level)
2852 return IDENTIFIER_GLOBAL_VALUE (name);
2854 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2857 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2858 if (DECL_NAME (t) == name)
2864 /* Mark ARG for GC. */
2867 mark_binding_level (arg)
2870 struct binding_level *level = *(struct binding_level **) arg;
2872 for (; level != 0; level = level->level_chain)
2874 ggc_mark_tree (level->names);
2875 ggc_mark_tree (level->tags);
2876 ggc_mark_tree (level->shadowed);
2877 ggc_mark_tree (level->blocks);
2878 ggc_mark_tree (level->this_block);
2879 ggc_mark_tree (level->parm_order);
2883 /* Create the predefined scalar types of C,
2884 and some nodes representing standard constants (0, 1, (void *) 0).
2885 Initialize the global binding level.
2886 Make definitions for built-in primitive functions. */
2889 init_decl_processing ()
2891 register tree endlink;
2892 tree ptr_ftype_void, ptr_ftype_ptr;
2893 int wchar_type_size;
2894 tree array_domain_type;
2897 current_function_decl = NULL;
2898 named_labels = NULL;
2899 current_binding_level = NULL_BINDING_LEVEL;
2900 free_binding_level = NULL_BINDING_LEVEL;
2901 pushlevel (0); /* make the binding_level structure for global names */
2902 global_binding_level = current_binding_level;
2904 build_common_tree_nodes (flag_signed_char);
2906 /* Define `int' and `char' first so that dbx will output them first. */
2907 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2908 integer_type_node));
2909 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2911 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2912 long_integer_type_node));
2913 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2914 unsigned_type_node));
2915 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2916 long_unsigned_type_node));
2917 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2918 long_long_integer_type_node));
2919 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2920 long_long_unsigned_type_node));
2921 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2922 short_integer_type_node));
2923 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2924 short_unsigned_type_node));
2925 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2926 signed_char_type_node));
2927 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2928 unsigned_char_type_node));
2929 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2930 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2931 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2932 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2933 #if HOST_BITS_PER_WIDE_INT >= 64
2934 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2936 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2937 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2938 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2939 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2940 #if HOST_BITS_PER_WIDE_INT >= 64
2941 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2944 /* `unsigned long' is the standard type for sizeof.
2945 Traditionally, use a signed type.
2946 Note that stddef.h uses `unsigned long',
2947 and this must agree, even if long and int are the same size. */
2948 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2949 if (flag_traditional && TREE_UNSIGNED (t))
2950 t = signed_type (t);
2954 /* Create the widest literal types. */
2955 widest_integer_literal_type_node
2956 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2957 widest_unsigned_literal_type_node
2958 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2959 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2960 widest_integer_literal_type_node));
2961 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2962 widest_unsigned_literal_type_node));
2964 build_common_tree_nodes_2 (flag_short_double);
2966 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2968 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2971 long_double_type_node));
2972 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2973 complex_integer_type_node));
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2975 complex_float_type_node));
2976 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2977 complex_double_type_node));
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2979 complex_long_double_type_node));
2980 pushdecl (build_decl (TYPE_DECL,
2981 ridpointers[(int) RID_VOID], void_type_node));
2983 #ifdef MD_INIT_BUILTINS
2987 wchar_type_node = get_identifier (flag_short_wchar
2988 ? "short unsigned int"
2990 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
2991 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2992 signed_wchar_type_node = signed_type (wchar_type_node);
2993 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2995 boolean_type_node = integer_type_node;
2996 boolean_true_node = integer_one_node;
2997 boolean_false_node = integer_zero_node;
2999 string_type_node = build_pointer_type (char_type_node);
3000 const_string_type_node
3001 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3003 /* Make a type to be the domain of a few array types
3004 whose domains don't really matter.
3005 200 is small enough that it always fits in size_t
3006 and large enough that it can hold most function names for the
3007 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3008 array_domain_type = build_index_type (build_int_2 (200, 0));
3010 /* make a type for arrays of characters.
3011 With luck nothing will ever really depend on the length of this
3013 char_array_type_node
3014 = build_array_type (char_type_node, array_domain_type);
3015 /* Likewise for arrays of ints. */
3017 = build_array_type (integer_type_node, array_domain_type);
3018 /* This is for wide string constants. */
3019 wchar_array_type_node
3020 = build_array_type (wchar_type_node, array_domain_type);
3022 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3024 default_function_type
3025 = build_function_type (integer_type_node, NULL_TREE);
3027 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3029 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3031 endlink = void_list_node;
3032 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3034 = build_function_type (ptr_type_node,
3035 tree_cons (NULL_TREE, ptr_type_node, endlink));
3037 /* Types which are common to the fortran compiler and libf2c. When
3038 changing these, you also need to be concerned with f/com.h. */
3040 if (TYPE_PRECISION (float_type_node)
3041 == TYPE_PRECISION (long_integer_type_node))
3043 g77_integer_type_node = long_integer_type_node;
3044 g77_uinteger_type_node = long_unsigned_type_node;
3046 else if (TYPE_PRECISION (float_type_node)
3047 == TYPE_PRECISION (integer_type_node))
3049 g77_integer_type_node = integer_type_node;
3050 g77_uinteger_type_node = unsigned_type_node;
3053 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3055 if (g77_integer_type_node != NULL_TREE)
3057 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3058 g77_integer_type_node));
3059 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3060 g77_uinteger_type_node));
3063 if (TYPE_PRECISION (float_type_node) * 2
3064 == TYPE_PRECISION (long_integer_type_node))
3066 g77_longint_type_node = long_integer_type_node;
3067 g77_ulongint_type_node = long_unsigned_type_node;
3069 else if (TYPE_PRECISION (float_type_node) * 2
3070 == TYPE_PRECISION (long_long_integer_type_node))
3072 g77_longint_type_node = long_long_integer_type_node;
3073 g77_ulongint_type_node = long_long_unsigned_type_node;
3076 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3078 if (g77_longint_type_node != NULL_TREE)
3080 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3081 g77_longint_type_node));
3082 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3083 g77_ulongint_type_node));
3086 builtin_function ("__builtin_aggregate_incoming_address",
3087 build_function_type (ptr_type_node, NULL_TREE),
3088 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3089 BUILT_IN_NORMAL, NULL_PTR);
3091 /* Hooks for the DWARF 2 __throw routine. */
3092 builtin_function ("__builtin_unwind_init",
3093 build_function_type (void_type_node, endlink),
3094 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3095 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3096 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3097 builtin_function ("__builtin_dwarf_fp_regnum",
3098 build_function_type (unsigned_type_node, endlink),
3099 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3100 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3101 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3102 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3103 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3104 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3105 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3107 ("__builtin_eh_return",
3108 build_function_type (void_type_node,
3109 tree_cons (NULL_TREE, ptr_type_node,
3110 tree_cons (NULL_TREE,
3111 type_for_mode (ptr_mode, 0),
3112 tree_cons (NULL_TREE,
3115 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3117 pedantic_lvalues = pedantic;
3119 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3120 make_fname_decl = c_make_fname_decl;
3121 declare_function_name ();
3123 start_identifier_warnings ();
3125 /* Prepare to check format strings against argument lists. */
3126 init_function_format_info ();
3130 incomplete_decl_finalize_hook = finish_incomplete_decl;
3132 lang_get_alias_set = c_get_alias_set;
3134 /* Record our roots. */
3136 ggc_add_tree_root (c_global_trees, CTI_MAX);
3137 ggc_add_tree_root (&named_labels, 1);
3138 ggc_add_tree_root (&shadowed_labels, 1);
3139 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3140 mark_binding_level);
3141 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3142 mark_binding_level);
3143 ggc_add_tree_root (&static_ctors, 1);
3144 ggc_add_tree_root (&static_dtors, 1);
3147 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3148 decl, NAME is the initialization string and TYPE_DEP indicates whether
3149 NAME depended on the type of the function. As we don't yet implement
3150 delayed emission of static data, we mark the decl as emitted
3151 so it is not placed in the output. Anything using it must therefore pull
3152 out the STRING_CST initializer directly. This does mean that these names
3153 are string merging candidates, which C99 does not permit. */
3156 c_make_fname_decl (id, name, type_dep)
3159 int type_dep ATTRIBUTE_UNUSED;
3161 tree decl, type, init;
3162 size_t length = strlen (name);
3164 type = build_array_type
3165 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3166 build_index_type (build_int_2 (length, 0)));
3168 decl = build_decl (VAR_DECL, id, type);
3169 TREE_STATIC (decl) = 1;
3170 TREE_READONLY (decl) = 1;
3171 TREE_ASM_WRITTEN (decl) = 1;
3172 DECL_SOURCE_LINE (decl) = 0;
3173 DECL_ARTIFICIAL (decl) = 1;
3174 DECL_IN_SYSTEM_HEADER (decl) = 1;
3175 DECL_IGNORED_P (decl) = 1;
3176 init = build_string (length + 1, name);
3177 TREE_TYPE (init) = type;
3178 DECL_INITIAL (decl) = init;
3179 finish_decl (pushdecl (decl), init, NULL_TREE);
3184 /* Return a definition for a builtin function named NAME and whose data type
3185 is TYPE. TYPE should be a function type with argument types.
3186 FUNCTION_CODE tells later passes how to compile calls to this function.
3187 See tree.h for its possible values.
3189 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3190 the name to be called if we can't opencode the function. */
3193 builtin_function (name, type, function_code, class, library_name)
3197 enum built_in_class class;
3198 const char *library_name;
3200 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3201 DECL_EXTERNAL (decl) = 1;
3202 TREE_PUBLIC (decl) = 1;
3203 /* If -traditional, permit redefining a builtin function any way you like.
3204 (Though really, if the program redefines these functions,
3205 it probably won't work right unless compiled with -fno-builtin.) */
3206 if (flag_traditional && name[0] != '_')
3207 DECL_BUILT_IN_NONANSI (decl) = 1;
3209 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3210 make_decl_rtl (decl, NULL_PTR, 1);
3212 DECL_BUILT_IN_CLASS (decl) = class;
3213 DECL_FUNCTION_CODE (decl) = function_code;
3215 /* Warn if a function in the namespace for users
3216 is used without an occasion to consider it declared. */
3217 if (name[0] != '_' || name[1] != '_')
3218 C_DECL_ANTICIPATED (decl) = 1;
3223 /* Called when a declaration is seen that contains no names to declare.
3224 If its type is a reference to a structure, union or enum inherited
3225 from a containing scope, shadow that tag name for the current scope
3226 with a forward reference.
3227 If its type defines a new named structure or union
3228 or defines an enum, it is valid but we need not do anything here.
3229 Otherwise, it is an error. */
3232 shadow_tag (declspecs)
3235 shadow_tag_warned (declspecs, 0);
3239 shadow_tag_warned (declspecs, warned)
3242 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3249 pending_invalid_xref = 0;
3251 /* Remove the attributes from declspecs, since they will confuse the
3253 split_specs_attrs (declspecs, &specs, &attrs);
3255 for (link = specs; link; link = TREE_CHAIN (link))
3257 register tree value = TREE_VALUE (link);
3258 register enum tree_code code = TREE_CODE (value);
3260 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3261 /* Used to test also that TYPE_SIZE (value) != 0.
3262 That caused warning for `struct foo;' at top level in the file. */
3264 register tree name = lookup_tag_reverse (value);
3271 if (warned != 1 && code != ENUMERAL_TYPE)
3272 /* Empty unnamed enum OK */
3274 pedwarn ("unnamed struct/union that defines no instances");
3280 t = lookup_tag (code, name, current_binding_level, 1);
3284 t = make_node (code);
3291 if (!warned && ! in_system_header)
3293 warning ("useless keyword or type name in empty declaration");
3300 error ("two types specified in one empty declaration");
3305 pedwarn ("empty declaration");
3309 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3312 groktypename (typename)
3315 if (TREE_CODE (typename) != TREE_LIST)
3317 return grokdeclarator (TREE_VALUE (typename),
3318 TREE_PURPOSE (typename),
3322 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3325 groktypename_in_parm_context (typename)
3328 if (TREE_CODE (typename) != TREE_LIST)
3330 return grokdeclarator (TREE_VALUE (typename),
3331 TREE_PURPOSE (typename),
3335 /* Decode a declarator in an ordinary declaration or data definition.
3336 This is called as soon as the type information and variable name
3337 have been parsed, before parsing the initializer if any.
3338 Here we create the ..._DECL node, fill in its type,
3339 and put it on the list of decls for the current context.
3340 The ..._DECL node is returned as the value.
3342 Exception: for arrays where the length is not specified,
3343 the type is left null, to be filled in by `finish_decl'.
3345 Function definitions do not come here; they go to start_function
3346 instead. However, external and forward declarations of functions
3347 do go through here. Structure field declarations are done by
3348 grokfield and not through here. */
3351 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3352 tree declarator, declspecs;
3354 tree attributes, prefix_attributes;
3356 register tree decl = grokdeclarator (declarator, declspecs,
3357 NORMAL, initialized);
3360 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3361 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3362 warning_with_decl (decl, "`%s' is usually a function");
3365 /* Is it valid for this decl to have an initializer at all?
3366 If not, set INITIALIZED to zero, which will indirectly
3367 tell `finish_decl' to ignore the initializer once it is parsed. */
3368 switch (TREE_CODE (decl))
3371 /* typedef foo = bar means give foo the same type as bar.
3372 We haven't parsed bar yet, so `finish_decl' will fix that up.
3373 Any other case of an initialization in a TYPE_DECL is an error. */
3374 if (pedantic || list_length (declspecs) > 1)
3376 error ("typedef `%s' is initialized",
3377 IDENTIFIER_POINTER (DECL_NAME (decl)));
3383 error ("function `%s' is initialized like a variable",
3384 IDENTIFIER_POINTER (DECL_NAME (decl)));
3389 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3390 error ("parameter `%s' is initialized",
3391 IDENTIFIER_POINTER (DECL_NAME (decl)));
3396 /* Don't allow initializations for incomplete types
3397 except for arrays which might be completed by the initialization. */
3398 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3400 /* A complete type is ok if size is fixed. */
3402 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3403 || C_DECL_VARIABLE_SIZE (decl))
3405 error ("variable-sized object may not be initialized");
3409 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3411 error ("variable `%s' has initializer but incomplete type",
3412 IDENTIFIER_POINTER (DECL_NAME (decl)));
3415 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3417 error ("elements of array `%s' have incomplete type",
3418 IDENTIFIER_POINTER (DECL_NAME (decl)));
3425 #if 0 /* Seems redundant with grokdeclarator. */
3426 if (current_binding_level != global_binding_level
3427 && DECL_EXTERNAL (decl)
3428 && TREE_CODE (decl) != FUNCTION_DECL)
3429 warning ("declaration of `%s' has `extern' and is initialized",
3430 IDENTIFIER_POINTER (DECL_NAME (decl)));
3432 DECL_EXTERNAL (decl) = 0;
3433 if (current_binding_level == global_binding_level)
3434 TREE_STATIC (decl) = 1;
3436 /* Tell `pushdecl' this is an initialized decl
3437 even though we don't yet have the initializer expression.
3438 Also tell `finish_decl' it may store the real initializer. */
3439 DECL_INITIAL (decl) = error_mark_node;
3442 /* If this is a function declaration, write a record describing it to the
3443 prototypes file (if requested). */
3445 if (TREE_CODE (decl) == FUNCTION_DECL)
3446 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3448 /* ANSI specifies that a tentative definition which is not merged with
3449 a non-tentative definition behaves exactly like a definition with an
3450 initializer equal to zero. (Section 3.7.2)
3451 -fno-common gives strict ANSI behavior. Usually you don't want it.
3452 This matters only for variables with external linkage. */
3453 if (! flag_no_common || ! TREE_PUBLIC (decl))
3454 DECL_COMMON (decl) = 1;
3456 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3457 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3460 /* Set attributes here so if duplicate decl, will have proper attributes. */
3461 decl_attributes (decl, attributes, prefix_attributes);
3463 /* Add this decl to the current binding level.
3464 TEM may equal DECL or it may be a previous decl of the same name. */
3465 tem = pushdecl (decl);
3467 /* For a local variable, define the RTL now. */
3468 if (current_binding_level != global_binding_level
3469 /* But not if this is a duplicate decl
3470 and we preserved the rtl from the previous one
3471 (which may or may not happen). */
3472 && DECL_RTL (tem) == 0)
3474 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3476 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3477 && DECL_INITIAL (tem) != 0)
3484 /* Finish processing of a declaration;
3485 install its initial value.
3486 If the length of an array type is not known before,
3487 it must be determined now, from the initial value, or it is an error. */
3490 finish_decl (decl, init, asmspec_tree)
3494 register tree type = TREE_TYPE (decl);
3495 int was_incomplete = (DECL_SIZE (decl) == 0);
3498 /* If a name was specified, get the string. */
3500 asmspec = TREE_STRING_POINTER (asmspec_tree);
3502 /* If `start_decl' didn't like having an initialization, ignore it now. */
3504 if (init != 0 && DECL_INITIAL (decl) == 0)
3506 /* Don't crash if parm is initialized. */
3507 if (TREE_CODE (decl) == PARM_DECL)
3510 if (ITERATOR_P (decl))
3513 error_with_decl (decl, "iterator has no initial value");
3515 init = save_expr (init);
3520 if (TREE_CODE (decl) != TYPE_DECL)
3521 store_init_value (decl, init);
3524 /* typedef foo = bar; store the type of bar as the type of foo. */
3525 TREE_TYPE (decl) = TREE_TYPE (init);
3526 DECL_INITIAL (decl) = init = 0;
3530 /* Deduce size of array from initialization, if not already known */
3532 if (TREE_CODE (type) == ARRAY_TYPE
3533 && TYPE_DOMAIN (type) == 0
3534 && TREE_CODE (decl) != TYPE_DECL)
3537 = (TREE_STATIC (decl)
3538 /* Even if pedantic, an external linkage array
3539 may have incomplete type at first. */
3540 ? pedantic && !TREE_PUBLIC (decl)
3541 : !DECL_EXTERNAL (decl));
3543 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3545 /* Get the completed type made by complete_array_type. */
3546 type = TREE_TYPE (decl);
3549 error_with_decl (decl, "initializer fails to determine size of `%s'");
3554 error_with_decl (decl, "array size missing in `%s'");
3555 /* If a `static' var's size isn't known,
3556 make it extern as well as static, so it does not get
3558 If it is not `static', then do not mark extern;
3559 finish_incomplete_decl will give it a default size
3560 and it will get allocated. */
3561 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3562 DECL_EXTERNAL (decl) = 1;
3565 /* TYPE_MAX_VALUE is always one less than the number of elements
3566 in the array, because we start counting at zero. Therefore,
3567 warn only if the value is less than zero. */
3568 if (pedantic && TYPE_DOMAIN (type) != 0
3569 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3570 error_with_decl (decl, "zero or negative size array `%s'");
3572 layout_decl (decl, 0);
3575 if (TREE_CODE (decl) == VAR_DECL)
3577 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3578 layout_decl (decl, 0);
3580 if (DECL_SIZE (decl) == 0
3581 && (TREE_STATIC (decl)
3583 /* A static variable with an incomplete type
3584 is an error if it is initialized.
3585 Also if it is not file scope.
3586 Otherwise, let it through, but if it is not `extern'
3587 then it may cause an error message later. */
3588 /* A duplicate_decls call could have changed an extern
3589 declaration into a file scope one. This can be detected
3590 by TREE_ASM_WRITTEN being set. */
3591 (DECL_INITIAL (decl) != 0
3592 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3594 /* An automatic variable with an incomplete type
3596 !DECL_EXTERNAL (decl)))
3598 error_with_decl (decl, "storage size of `%s' isn't known");
3599 TREE_TYPE (decl) = error_mark_node;
3602 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3603 && DECL_SIZE (decl) != 0)
3605 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3606 constant_expression_warning (DECL_SIZE (decl));
3608 error_with_decl (decl, "storage size of `%s' isn't constant");
3611 if (TREE_USED (type))
3612 TREE_USED (decl) = 1;
3615 /* If this is a function and an assembler name is specified, it isn't
3616 builtin any more. Also reset DECL_RTL so we can give it its new
3618 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3620 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3621 DECL_RTL (decl) = 0;
3622 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3625 /* Output the assembler code and/or RTL code for variables and functions,
3626 unless the type is an undefined structure or union.
3627 If not, it will get done when the type is completed. */
3629 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3631 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3632 maybe_objc_check_decl (decl);
3633 rest_of_decl_compilation (decl, asmspec,
3634 (DECL_CONTEXT (decl) == 0
3635 || TREE_ASM_WRITTEN (decl)), 0);
3637 if (DECL_CONTEXT (decl) != 0)
3639 /* Recompute the RTL of a local array now
3640 if it used to be an incomplete type. */
3642 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3644 /* If we used it already as memory, it must stay in memory. */
3645 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3646 /* If it's still incomplete now, no init will save it. */
3647 if (DECL_SIZE (decl) == 0)
3648 DECL_INITIAL (decl) = 0;
3651 /* Compute and store the initial value. */
3652 if (TREE_CODE (decl) != FUNCTION_DECL)
3653 expand_decl_init (decl);
3657 if (TREE_CODE (decl) == TYPE_DECL)
3659 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3660 maybe_objc_check_decl (decl);
3661 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3664 /* At the end of a declaration, throw away any variable type sizes
3665 of types defined inside that declaration. There is no use
3666 computing them in the following function definition. */
3667 if (current_binding_level == global_binding_level)
3668 get_pending_sizes ();
3671 /* If DECL has a cleanup, build and return that cleanup here.
3672 This is a callback called by expand_expr. */
3675 maybe_build_cleanup (decl)
3676 tree decl ATTRIBUTE_UNUSED;
3678 /* There are no cleanups in C. */
3682 /* Given a parsed parameter declaration,
3683 decode it into a PARM_DECL and push that on the current binding level.
3684 Also, for the sake of forward parm decls,
3685 record the given order of parms in `parm_order'. */
3688 push_parm_decl (parm)
3692 int old_immediate_size_expand = immediate_size_expand;
3693 /* Don't try computing parm sizes now -- wait till fn is called. */
3694 immediate_size_expand = 0;
3696 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3697 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3698 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3699 TREE_PURPOSE (TREE_VALUE (parm)));
3702 if (DECL_NAME (decl))
3705 olddecl = lookup_name (DECL_NAME (decl));
3706 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3707 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3711 decl = pushdecl (decl);
3713 immediate_size_expand = old_immediate_size_expand;
3715 current_binding_level->parm_order
3716 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3718 /* Add this decl to the current binding level. */
3719 finish_decl (decl, NULL_TREE, NULL_TREE);
3722 /* Clear the given order of parms in `parm_order'.
3723 Used at start of parm list,
3724 and also at semicolon terminating forward decls. */
3729 current_binding_level->parm_order = NULL_TREE;
3732 /* Make TYPE a complete type based on INITIAL_VALUE.
3733 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3734 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3737 complete_array_type (type, initial_value, do_default)
3742 register tree maxindex = NULL_TREE;
3747 /* Note MAXINDEX is really the maximum index,
3748 one less than the size. */
3749 if (TREE_CODE (initial_value) == STRING_CST)
3752 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3753 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3756 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3758 tree elts = CONSTRUCTOR_ELTS (initial_value);
3759 maxindex = build_int_2 (-1, -1);
3760 for (; elts; elts = TREE_CHAIN (elts))
3762 if (TREE_PURPOSE (elts))
3763 maxindex = TREE_PURPOSE (elts);
3765 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3766 maxindex, integer_one_node));
3768 maxindex = copy_node (maxindex);
3772 /* Make an error message unless that happened already. */
3773 if (initial_value != error_mark_node)
3776 /* Prevent further error messages. */
3777 maxindex = build_int_2 (0, 0);
3784 maxindex = build_int_2 (0, 0);
3790 TYPE_DOMAIN (type) = build_index_type (maxindex);
3791 if (!TREE_TYPE (maxindex))
3792 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3795 /* Lay out the type now that we can get the real answer. */
3802 /* Given declspecs and a declarator,
3803 determine the name and type of the object declared
3804 and construct a ..._DECL node for it.
3805 (In one case we can return a ..._TYPE node instead.
3806 For invalid input we sometimes return 0.)
3808 DECLSPECS is a chain of tree_list nodes whose value fields
3809 are the storage classes and type specifiers.
3811 DECL_CONTEXT says which syntactic context this declaration is in:
3812 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3813 FUNCDEF for a function definition. Like NORMAL but a few different
3814 error messages in each case. Return value may be zero meaning
3815 this definition is too screwy to try to parse.
3816 PARM for a parameter declaration (either within a function prototype
3817 or before a function body). Make a PARM_DECL, or return void_type_node.
3818 TYPENAME if for a typename (in a cast or sizeof).
3819 Don't make a DECL node; just return the ..._TYPE node.
3820 FIELD for a struct or union field; make a FIELD_DECL.
3821 BITFIELD for a field with specified width.
3822 INITIALIZED is 1 if the decl has an initializer.
3824 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3825 It may also be so in the PARM case, for a prototype where the
3826 argument type is specified but not the name.
3828 This function is where the complicated C meanings of `static'
3829 and `extern' are interpreted. */
3832 grokdeclarator (declarator, declspecs, decl_context, initialized)
3835 enum decl_context decl_context;
3840 tree type = NULL_TREE;
3845 int type_quals = TYPE_UNQUALIFIED;
3847 int explicit_int = 0;
3848 int explicit_char = 0;
3849 int defaulted_int = 0;
3850 tree typedef_decl = 0;
3852 tree typedef_type = 0;
3853 int funcdef_flag = 0;
3854 enum tree_code innermost_code = ERROR_MARK;
3856 int size_varies = 0;
3857 tree decl_machine_attr = NULL_TREE;
3859 if (decl_context == BITFIELD)
3860 bitfield = 1, decl_context = FIELD;
3862 if (decl_context == FUNCDEF)
3863 funcdef_flag = 1, decl_context = NORMAL;
3865 /* Look inside a declarator for the name being declared
3866 and get it as a string, for an error message. */
3868 register tree decl = declarator;
3872 switch (TREE_CODE (decl))
3877 innermost_code = TREE_CODE (decl);
3878 decl = TREE_OPERAND (decl, 0);
3881 case IDENTIFIER_NODE:
3882 name = IDENTIFIER_POINTER (decl);
3893 /* A function definition's declarator must have the form of
3894 a function declarator. */
3896 if (funcdef_flag && innermost_code != CALL_EXPR)
3899 /* Anything declared one level down from the top level
3900 must be one of the parameters of a function
3901 (because the body is at least two levels down). */
3903 /* If this looks like a function definition, make it one,
3904 even if it occurs where parms are expected.
3905 Then store_parm_decls will reject it and not use it as a parm. */
3906 if (decl_context == NORMAL && !funcdef_flag
3907 && current_binding_level->parm_flag)
3908 decl_context = PARM;
3910 /* Look through the decl specs and record which ones appear.
3911 Some typespecs are defined as built-in typenames.
3912 Others, the ones that are modifiers of other types,
3913 are represented by bits in SPECBITS: set the bits for
3914 the modifiers that appear. Storage class keywords are also in SPECBITS.
3916 If there is a typedef name or a type, store the type in TYPE.
3917 This includes builtin typedefs such as `int'.
3919 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3920 and did not come from a user typedef.
3922 Set LONGLONG if `long' is mentioned twice. */
3924 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3927 register tree id = TREE_VALUE (spec);
3929 if (id == ridpointers[(int) RID_INT])
3931 if (id == ridpointers[(int) RID_CHAR])
3934 if (TREE_CODE (id) == IDENTIFIER_NODE)
3935 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3937 if (ridpointers[i] == id)
3939 if (i == (int) RID_LONG && specbits & (1<<i))
3942 error ("`long long long' is too long for GCC");
3945 if (pedantic && ! in_system_header && warn_long_long)
3946 pedwarn ("ANSI C does not support `long long'");
3950 else if (specbits & (1 << i))
3951 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3957 error ("two or more data types in declaration of `%s'", name);
3958 /* Actual typedefs come to us as TYPE_DECL nodes. */
3959 else if (TREE_CODE (id) == TYPE_DECL)
3961 type = TREE_TYPE (id);
3962 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3965 /* Built-in types come as identifiers. */
3966 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3968 register tree t = lookup_name (id);
3969 if (TREE_TYPE (t) == error_mark_node)
3971 else if (!t || TREE_CODE (t) != TYPE_DECL)
3972 error ("`%s' fails to be a typedef or built in type",
3973 IDENTIFIER_POINTER (id));
3976 type = TREE_TYPE (t);
3980 else if (TREE_CODE (id) != ERROR_MARK)
3986 typedef_type = type;
3988 size_varies = C_TYPE_VARIABLE_SIZE (type);
3990 /* No type at all: default to `int', and set DEFAULTED_INT
3991 because it was not a user-defined typedef. */
3995 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3996 | (1 << (int) RID_SIGNED)
3997 | (1 << (int) RID_UNSIGNED))))
3998 /* Don't warn about typedef foo = bar. */
3999 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4000 && ! in_system_header)
4002 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4003 and this is a function, or if -Wimplicit; prefer the former
4004 warning since it is more explicit. */
4005 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4006 warn_about_return_type = 1;
4007 else if (warn_implicit_int || flag_isoc99)
4008 warning ("type defaults to `int' in declaration of `%s'", name);
4012 type = integer_type_node;
4015 /* Now process the modifiers that were specified
4016 and check for invalid combinations. */
4018 /* Long double is a special combination. */
4020 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4021 && TYPE_MAIN_VARIANT (type) == double_type_node)
4023 specbits &= ~ (1 << (int) RID_LONG);
4024 type = long_double_type_node;
4027 /* Check all other uses of type modifiers. */
4029 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4030 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4034 if ((specbits & 1 << (int) RID_LONG)
4035 && (specbits & 1 << (int) RID_SHORT))
4036 error ("both long and short specified for `%s'", name);
4037 else if (((specbits & 1 << (int) RID_LONG)
4038 || (specbits & 1 << (int) RID_SHORT))
4040 error ("long or short specified with char for `%s'", name);
4041 else if (((specbits & 1 << (int) RID_LONG)
4042 || (specbits & 1 << (int) RID_SHORT))
4043 && TREE_CODE (type) == REAL_TYPE)
4045 static int already = 0;
4047 error ("long or short specified with floating type for `%s'", name);
4048 if (! already && ! pedantic)
4050 error ("the only valid combination is `long double'");
4054 else if ((specbits & 1 << (int) RID_SIGNED)
4055 && (specbits & 1 << (int) RID_UNSIGNED))
4056 error ("both signed and unsigned specified for `%s'", name);
4057 else if (TREE_CODE (type) != INTEGER_TYPE)
4058 error ("long, short, signed or unsigned invalid for `%s'", name);
4062 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4064 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4066 if (flag_pedantic_errors)
4071 /* Discard the type modifiers if they are invalid. */
4074 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4075 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4080 if ((specbits & (1 << (int) RID_COMPLEX))
4081 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4083 error ("complex invalid for `%s'", name);
4084 specbits &= ~ (1 << (int) RID_COMPLEX);
4087 /* Decide whether an integer type is signed or not.
4088 Optionally treat bitfields as signed by default. */
4089 if (specbits & 1 << (int) RID_UNSIGNED
4090 /* Traditionally, all bitfields are unsigned. */
4091 || (bitfield && flag_traditional
4092 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4093 || (bitfield && ! flag_signed_bitfields
4094 && (explicit_int || defaulted_int || explicit_char
4095 /* A typedef for plain `int' without `signed'
4096 can be controlled just like plain `int'. */
4097 || ! (typedef_decl != 0
4098 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4099 && TREE_CODE (type) != ENUMERAL_TYPE
4100 && !(specbits & 1 << (int) RID_SIGNED)))
4103 type = long_long_unsigned_type_node;
4104 else if (specbits & 1 << (int) RID_LONG)
4105 type = long_unsigned_type_node;
4106 else if (specbits & 1 << (int) RID_SHORT)
4107 type = short_unsigned_type_node;
4108 else if (type == char_type_node)
4109 type = unsigned_char_type_node;
4110 else if (typedef_decl)
4111 type = unsigned_type (type);
4113 type = unsigned_type_node;
4115 else if ((specbits & 1 << (int) RID_SIGNED)
4116 && type == char_type_node)
4117 type = signed_char_type_node;
4119 type = long_long_integer_type_node;
4120 else if (specbits & 1 << (int) RID_LONG)
4121 type = long_integer_type_node;
4122 else if (specbits & 1 << (int) RID_SHORT)
4123 type = short_integer_type_node;
4125 if (specbits & 1 << (int) RID_COMPLEX)
4127 /* If we just have "complex", it is equivalent to
4128 "complex double", but if any modifiers at all are specified it is
4129 the complex form of TYPE. E.g, "complex short" is
4130 "complex short int". */
4132 if (defaulted_int && ! longlong
4133 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4134 | (1 << (int) RID_SIGNED)
4135 | (1 << (int) RID_UNSIGNED))))
4136 type = complex_double_type_node;
4137 else if (type == integer_type_node)
4138 type = complex_integer_type_node;
4139 else if (type == float_type_node)
4140 type = complex_float_type_node;
4141 else if (type == double_type_node)
4142 type = complex_double_type_node;
4143 else if (type == long_double_type_node)
4144 type = complex_long_double_type_node;
4146 type = build_complex_type (type);
4149 /* Figure out the type qualifiers for the declaration. There are
4150 two ways a declaration can become qualified. One is something
4151 like `const int i' where the `const' is explicit. Another is
4152 something like `typedef const int CI; CI i' where the type of the
4153 declaration contains the `const'. */
4154 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4155 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4156 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4157 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4159 pedwarn ("duplicate `const'");
4161 pedwarn ("duplicate `restrict'");
4163 pedwarn ("duplicate `volatile'");
4164 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4165 type = TYPE_MAIN_VARIANT (type);
4166 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4167 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4168 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4170 /* Warn if two storage classes are given. Default to `auto'. */
4175 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4176 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4177 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4178 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4179 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4180 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4182 /* Warn about storage classes that are invalid for certain
4183 kinds of declarations (parameters, typenames, etc.). */
4186 error ("multiple storage classes in declaration of `%s'", name);
4187 else if (funcdef_flag
4189 & ((1 << (int) RID_REGISTER)
4190 | (1 << (int) RID_AUTO)
4191 | (1 << (int) RID_TYPEDEF))))
4193 if (specbits & 1 << (int) RID_AUTO
4194 && (pedantic || current_binding_level == global_binding_level))
4195 pedwarn ("function definition declared `auto'");
4196 if (specbits & 1 << (int) RID_REGISTER)
4197 error ("function definition declared `register'");
4198 if (specbits & 1 << (int) RID_TYPEDEF)
4199 error ("function definition declared `typedef'");
4200 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4201 | (1 << (int) RID_AUTO));
4203 else if (decl_context != NORMAL && nclasses > 0)
4205 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4209 switch (decl_context)
4212 error ("storage class specified for structure field `%s'", name);
4215 error ("storage class specified for parameter `%s'", name);
4218 error ("storage class specified for typename");
4221 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4222 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4223 | (1 << (int) RID_EXTERN));
4226 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4228 /* `extern' with initialization is invalid if not at top level. */
4229 if (current_binding_level == global_binding_level)
4230 warning ("`%s' initialized and declared `extern'", name);
4232 error ("`%s' has both `extern' and initializer", name);
4234 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4235 && current_binding_level != global_binding_level)
4236 error ("nested function `%s' declared `extern'", name);
4237 else if (current_binding_level == global_binding_level
4238 && specbits & (1 << (int) RID_AUTO))
4239 error ("top-level declaration of `%s' specifies `auto'", name);
4240 else if ((specbits & 1 << (int) RID_ITERATOR)
4241 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4243 error ("iterator `%s' has derived type", name);
4244 type = error_mark_node;
4246 else if ((specbits & 1 << (int) RID_ITERATOR)
4247 && TREE_CODE (type) != INTEGER_TYPE)
4249 error ("iterator `%s' has noninteger type", name);
4250 type = error_mark_node;
4254 /* Now figure out the structure of the declarator proper.
4255 Descend through it, creating more complex types, until we reach
4256 the declared identifier (or NULL_TREE, in an absolute declarator). */
4258 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4260 if (type == error_mark_node)
4262 declarator = TREE_OPERAND (declarator, 0);
4266 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4267 an INDIRECT_REF (for *...),
4268 a CALL_EXPR (for ...(...)),
4269 an identifier (for the name being declared)
4270 or a null pointer (for the place in an absolute declarator
4271 where the name was omitted).
4272 For the last two cases, we have just exited the loop.
4274 At this point, TYPE is the type of elements of an array,
4275 or for a function to return, or for a pointer to point to.
4276 After this sequence of ifs, TYPE is the type of the
4277 array or function or pointer, and DECLARATOR has had its
4278 outermost layer removed. */
4280 if (TREE_CODE (declarator) == ARRAY_REF)
4282 register tree itype = NULL_TREE;
4283 register tree size = TREE_OPERAND (declarator, 1);
4284 /* The index is a signed object `sizetype' bits wide. */
4285 tree index_type = signed_type (sizetype);
4287 declarator = TREE_OPERAND (declarator, 0);
4289 /* Check for some types that there cannot be arrays of. */
4291 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4293 error ("declaration of `%s' as array of voids", name);
4294 type = error_mark_node;
4297 if (TREE_CODE (type) == FUNCTION_TYPE)
4299 error ("declaration of `%s' as array of functions", name);
4300 type = error_mark_node;
4303 if (size == error_mark_node)
4304 type = error_mark_node;
4306 if (type == error_mark_node)
4309 /* If size was specified, set ITYPE to a range-type for that size.
4310 Otherwise, ITYPE remains null. finish_decl may figure it out
4311 from an initial value. */
4315 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4316 STRIP_TYPE_NOPS (size);
4318 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4319 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4321 error ("size of array `%s' has non-integer type", name);
4322 size = integer_one_node;
4325 if (pedantic && integer_zerop (size))
4326 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4328 if (TREE_CODE (size) == INTEGER_CST)
4330 constant_expression_warning (size);
4331 if (tree_int_cst_sgn (size) < 0)
4333 error ("size of array `%s' is negative", name);
4334 size = integer_one_node;
4339 /* Make sure the array size remains visibly nonconstant
4340 even if it is (eg) a const variable with known value. */
4345 if (TREE_CONSTANT (size))
4346 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4348 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4352 /* Convert size to index_type, so that if it is a variable
4353 the computations will be done in the proper mode. */
4354 itype = fold (build (MINUS_EXPR, index_type,
4355 convert (index_type, size),
4356 convert (index_type, size_one_node)));
4358 /* If that overflowed, the array is too big.
4359 ??? While a size of INT_MAX+1 technically shouldn't cause
4360 an overflow (because we subtract 1), the overflow is recorded
4361 during the conversion to index_type, before the subtraction.
4362 Handling this case seems like an unnecessary complication. */
4363 if (TREE_OVERFLOW (itype))
4365 error ("size of array `%s' is too large", name);
4366 type = error_mark_node;
4371 itype = variable_size (itype);
4372 itype = build_index_type (itype);
4375 #if 0 /* This had bad results for pointers to arrays, as in
4376 union incomplete (*foo)[4]; */
4377 /* Complain about arrays of incomplete types, except in typedefs. */
4379 if (!COMPLETE_TYPE_P (type)
4380 /* Avoid multiple warnings for nested array types. */
4381 && TREE_CODE (type) != ARRAY_TYPE
4382 && !(specbits & (1 << (int) RID_TYPEDEF))
4383 && !C_TYPE_BEING_DEFINED (type))
4384 warning ("array type has incomplete element type");
4387 #if 0 /* We shouldn't have a function type here at all!
4388 Functions aren't allowed as array elements. */
4389 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4390 && (constp || volatilep))
4391 pedwarn ("ANSI C forbids const or volatile function types");
4394 /* Build the array type itself, then merge any constancy or
4395 volatility into the target type. We must do it in this order
4396 to ensure that the TYPE_MAIN_VARIANT field of the array type
4397 is set correctly. */
4399 type = build_array_type (type, itype);
4401 type = c_build_qualified_type (type, type_quals);
4403 #if 0 /* don't clear these; leave them set so that the array type
4404 or the variable is itself const or volatile. */
4405 type_quals = TYPE_UNQUALIFIED;
4409 C_TYPE_VARIABLE_SIZE (type) = 1;
4411 else if (TREE_CODE (declarator) == CALL_EXPR)
4415 /* Declaring a function type.
4416 Make sure we have a valid type for the function to return. */
4417 if (type == error_mark_node)
4422 /* Warn about some types functions can't return. */
4424 if (TREE_CODE (type) == FUNCTION_TYPE)
4426 error ("`%s' declared as function returning a function", name);
4427 type = integer_type_node;
4429 if (TREE_CODE (type) == ARRAY_TYPE)
4431 error ("`%s' declared as function returning an array", name);
4432 type = integer_type_node;
4435 #ifndef TRADITIONAL_RETURN_FLOAT
4436 /* Traditionally, declaring return type float means double. */
4438 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4439 type = double_type_node;
4440 #endif /* TRADITIONAL_RETURN_FLOAT */
4442 /* Construct the function type and go to the next
4443 inner layer of declarator. */
4445 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4447 /* Say it's a definition
4448 only for the CALL_EXPR
4449 closest to the identifier. */
4450 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4451 /* Type qualifiers before the return type of the function
4452 qualify the return type, not the function type. */
4454 type = c_build_qualified_type (type, type_quals);
4455 type_quals = TYPE_UNQUALIFIED;
4457 type = build_function_type (type, arg_types);
4458 declarator = TREE_OPERAND (declarator, 0);
4460 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4461 the formal parameter list of this FUNCTION_TYPE to point to
4462 the FUNCTION_TYPE node itself. */
4467 for (link = last_function_parm_tags;
4469 link = TREE_CHAIN (link))
4470 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4473 else if (TREE_CODE (declarator) == INDIRECT_REF)
4475 /* Merge any constancy or volatility into the target type
4478 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4480 pedwarn ("ANSI C forbids qualified function types");
4482 type = c_build_qualified_type (type, type_quals);
4483 type_quals = TYPE_UNQUALIFIED;
4486 type = build_pointer_type (type);
4488 /* Process a list of type modifier keywords
4489 (such as const or volatile) that were given inside the `*'. */
4491 if (TREE_TYPE (declarator))
4493 register tree typemodlist;
4499 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4500 typemodlist = TREE_CHAIN (typemodlist))
4502 tree qualifier = TREE_VALUE (typemodlist);
4504 if (qualifier == ridpointers[(int) RID_CONST])
4506 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4508 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4513 error ("invalid type modifier within pointer declarator");
4517 pedwarn ("duplicate `const'");
4519 pedwarn ("duplicate `volatile'");
4521 pedwarn ("duplicate `restrict'");
4523 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4524 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4525 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4528 declarator = TREE_OPERAND (declarator, 0);
4535 /* Now TYPE has the actual type. */
4537 /* Did array size calculations overflow? */
4539 if (TREE_CODE (type) == ARRAY_TYPE
4540 && COMPLETE_TYPE_P (type)
4541 && TREE_OVERFLOW (TYPE_SIZE (type)))
4542 error ("size of array `%s' is too large", name);
4544 /* If this is declaring a typedef name, return a TYPE_DECL. */
4546 if (specbits & (1 << (int) RID_TYPEDEF))
4549 /* Note that the grammar rejects storage classes
4550 in typenames, fields or parameters */
4551 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4553 pedwarn ("ANSI C forbids qualified function types");
4555 type = c_build_qualified_type (type, type_quals);
4556 decl = build_decl (TYPE_DECL, declarator, type);
4557 if ((specbits & (1 << (int) RID_SIGNED))
4558 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4559 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4563 /* Detect the case of an array type of unspecified size
4564 which came, as such, direct from a typedef name.
4565 We must copy the type, so that each identifier gets
4566 a distinct type, so that each identifier's size can be
4567 controlled separately by its own initializer. */
4569 if (type != 0 && typedef_type != 0
4570 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4571 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4573 type = build_array_type (TREE_TYPE (type), 0);
4575 C_TYPE_VARIABLE_SIZE (type) = 1;
4578 /* If this is a type name (such as, in a cast or sizeof),
4579 compute the type and return it now. */
4581 if (decl_context == TYPENAME)
4583 /* Note that the grammar rejects storage classes
4584 in typenames, fields or parameters */
4585 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4587 pedwarn ("ANSI C forbids const or volatile function types");
4589 type = c_build_qualified_type (type, type_quals);
4593 /* Aside from typedefs and type names (handle above),
4594 `void' at top level (not within pointer)
4595 is allowed only in public variables.
4596 We don't complain about parms either, but that is because
4597 a better error message can be made later. */
4599 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4600 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4601 && ((specbits & (1 << (int) RID_EXTERN))
4602 || (current_binding_level == global_binding_level
4604 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4606 error ("variable or field `%s' declared void", name);
4607 type = integer_type_node;
4610 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4611 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4616 if (decl_context == PARM)
4618 tree type_as_written = type;
4621 /* A parameter declared as an array of T is really a pointer to T.
4622 One declared as a function is really a pointer to a function. */
4624 if (TREE_CODE (type) == ARRAY_TYPE)
4626 /* Transfer const-ness of array into that of type pointed to. */
4627 type = TREE_TYPE (type);
4629 type = c_build_qualified_type (type, type_quals);
4630 type = build_pointer_type (type);
4631 type_quals = TYPE_UNQUALIFIED;
4634 else if (TREE_CODE (type) == FUNCTION_TYPE)
4636 if (pedantic && type_quals)
4637 pedwarn ("ANSI C forbids qualified function types");
4639 type = c_build_qualified_type (type, type_quals);
4640 type = build_pointer_type (type);
4641 type_quals = TYPE_UNQUALIFIED;
4644 decl = build_decl (PARM_DECL, declarator, type);
4646 C_DECL_VARIABLE_SIZE (decl) = 1;
4648 /* Compute the type actually passed in the parmlist,
4649 for the case where there is no prototype.
4650 (For example, shorts and chars are passed as ints.)
4651 When there is a prototype, this is overridden later. */
4653 if (type == error_mark_node)
4654 promoted_type = type;
4657 promoted_type = simple_type_promotes_to (type);
4658 if (! promoted_type)
4659 promoted_type = type;
4662 DECL_ARG_TYPE (decl) = promoted_type;
4663 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4665 else if (decl_context == FIELD)
4667 /* Structure field. It may not be a function. */
4669 if (TREE_CODE (type) == FUNCTION_TYPE)
4671 error ("field `%s' declared as a function", name);
4672 type = build_pointer_type (type);
4674 else if (TREE_CODE (type) != ERROR_MARK
4675 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4677 error ("field `%s' has incomplete type", name);
4678 type = error_mark_node;
4680 /* Move type qualifiers down to element of an array. */
4681 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4683 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4685 TYPE_DOMAIN (type));
4686 #if 0 /* Leave the field const or volatile as well. */
4687 type_quals = TYPE_UNQUALIFIED;
4690 decl = build_decl (FIELD_DECL, declarator, type);
4692 C_DECL_VARIABLE_SIZE (decl) = 1;
4694 else if (TREE_CODE (type) == FUNCTION_TYPE)
4696 /* Every function declaration is "external"
4697 except for those which are inside a function body
4698 in which `auto' is used.
4699 That is a case not specified by ANSI C,
4700 and we use it for forward declarations for nested functions. */
4701 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4702 || current_binding_level == global_binding_level);
4704 if (specbits & (1 << (int) RID_AUTO)
4705 && (pedantic || current_binding_level == global_binding_level))
4706 pedwarn ("invalid storage class for function `%s'", name);
4707 if (specbits & (1 << (int) RID_REGISTER))
4708 error ("invalid storage class for function `%s'", name);
4709 /* Function declaration not at top level.
4710 Storage classes other than `extern' are not allowed
4711 and `extern' makes no difference. */
4712 if (current_binding_level != global_binding_level
4713 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4715 pedwarn ("invalid storage class for function `%s'", name);
4717 decl = build_decl (FUNCTION_DECL, declarator, type);
4718 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4720 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4721 pedwarn ("ANSI C forbids qualified function types");
4724 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4725 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4726 && ! DECL_IN_SYSTEM_HEADER (decl))
4727 pedwarn ("ANSI C forbids qualified void function return type");
4729 /* GNU C interprets a `volatile void' return type to indicate
4730 that the function does not return. */
4731 if ((type_quals & TYPE_QUAL_VOLATILE)
4732 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4733 warning ("`noreturn' function returns non-void value");
4736 DECL_EXTERNAL (decl) = 1;
4737 /* Record absence of global scope for `static' or `auto'. */
4739 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4741 /* Record presence of `inline', if it is reasonable. */
4744 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4745 warning ("cannot inline function `main'");
4747 /* Assume that otherwise the function can be inlined. */
4748 DECL_INLINE (decl) = 1;
4750 if (specbits & (1 << (int) RID_EXTERN))
4751 current_extern_inline = 1;
4756 /* It's a variable. */
4757 /* An uninitialized decl with `extern' is a reference. */
4758 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4760 /* Move type qualifiers down to element of an array. */
4761 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4763 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4765 TYPE_DOMAIN (type));
4766 #if 0 /* Leave the variable const or volatile as well. */
4767 type_quals = TYPE_UNQUALIFIED;
4771 decl = build_decl (VAR_DECL, declarator, type);
4773 C_DECL_VARIABLE_SIZE (decl) = 1;
4776 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4778 DECL_EXTERNAL (decl) = extern_ref;
4779 /* At top level, the presence of a `static' or `register' storage
4780 class specifier, or the absence of all storage class specifiers
4781 makes this declaration a definition (perhaps tentative). Also,
4782 the absence of both `static' and `register' makes it public. */
4783 if (current_binding_level == global_binding_level)
4787 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4788 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4790 /* Not at top level, only `static' makes a static definition. */
4793 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4794 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4797 if (specbits & 1 << (int) RID_ITERATOR)
4798 ITERATOR_P (decl) = 1;
4801 /* Record `register' declaration for warnings on &
4802 and in case doing stupid register allocation. */
4804 if (specbits & (1 << (int) RID_REGISTER))
4805 DECL_REGISTER (decl) = 1;
4807 /* Record constancy and volatility. */
4808 c_apply_type_quals_to_decl (type_quals, decl);
4810 /* If a type has volatile components, it should be stored in memory.
4811 Otherwise, the fact that those components are volatile
4812 will be ignored, and would even crash the compiler. */
4813 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4814 mark_addressable (decl);
4820 /* Decode the parameter-list info for a function type or function definition.
4821 The argument is the value returned by `get_parm_info' (or made in parse.y
4822 if there is an identifier list instead of a parameter decl list).
4823 These two functions are separate because when a function returns
4824 or receives functions then each is called multiple times but the order
4825 of calls is different. The last call to `grokparms' is always the one
4826 that contains the formal parameter names of a function definition.
4828 Store in `last_function_parms' a chain of the decls of parms.
4829 Also store in `last_function_parm_tags' a chain of the struct, union,
4830 and enum tags declared among the parms.
4832 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4834 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4835 a mere declaration. A nonempty identifier-list gets an error message
4836 when FUNCDEF_FLAG is zero. */
4839 grokparms (parms_info, funcdef_flag)
4843 tree first_parm = TREE_CHAIN (parms_info);
4845 last_function_parms = TREE_PURPOSE (parms_info);
4846 last_function_parm_tags = TREE_VALUE (parms_info);
4848 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4849 && !in_system_header)
4850 warning ("function declaration isn't a prototype");
4853 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4856 pedwarn ("parameter names (without types) in function declaration");
4858 last_function_parms = first_parm;
4865 /* We no longer test FUNCDEF_FLAG.
4866 If the arg types are incomplete in a declaration,
4867 they must include undefined tags.
4868 These tags can never be defined in the scope of the declaration,
4869 so the types can never be completed,
4870 and no call can be compiled successfully. */
4872 /* In a fcn definition, arg types must be complete. */
4875 for (parm = last_function_parms, typelt = first_parm;
4877 parm = TREE_CHAIN (parm))
4878 /* Skip over any enumeration constants declared here. */
4879 if (TREE_CODE (parm) == PARM_DECL)
4881 /* Barf if the parameter itself has an incomplete type. */
4882 tree type = TREE_VALUE (typelt);
4883 if (!COMPLETE_TYPE_P (type))
4885 if (funcdef_flag && DECL_NAME (parm) != 0)
4886 error ("parameter `%s' has incomplete type",
4887 IDENTIFIER_POINTER (DECL_NAME (parm)));
4889 warning ("parameter has incomplete type");
4892 TREE_VALUE (typelt) = error_mark_node;
4893 TREE_TYPE (parm) = error_mark_node;
4896 #if 0 /* This has been replaced by parm_tags_warning
4897 which uses a more accurate criterion for what to warn about. */
4900 /* Now warn if is a pointer to an incomplete type. */
4901 while (TREE_CODE (type) == POINTER_TYPE
4902 || TREE_CODE (type) == REFERENCE_TYPE)
4903 type = TREE_TYPE (type);
4904 type = TYPE_MAIN_VARIANT (type);
4905 if (!COMPLETE_TYPE_P (type))
4907 if (DECL_NAME (parm) != 0)
4908 warning ("parameter `%s' points to incomplete type",
4909 IDENTIFIER_POINTER (DECL_NAME (parm)));
4911 warning ("parameter points to incomplete type");
4915 typelt = TREE_CHAIN (typelt);
4923 /* Return a tree_list node with info on a parameter list just parsed.
4924 The TREE_PURPOSE is a chain of decls of those parms.
4925 The TREE_VALUE is a list of structure, union and enum tags defined.
4926 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4927 This tree_list node is later fed to `grokparms'.
4929 VOID_AT_END nonzero means append `void' to the end of the type-list.
4930 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4933 get_parm_info (void_at_end)
4936 register tree decl, t;
4937 register tree types = 0;
4939 tree tags = gettags ();
4940 tree parms = getdecls ();
4942 tree order = current_binding_level->parm_order;
4944 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4945 if (void_at_end && parms != 0
4946 && TREE_CHAIN (parms) == 0
4947 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4948 && DECL_NAME (parms) == 0)
4951 storedecls (NULL_TREE);
4952 return tree_cons (NULL_TREE, NULL_TREE,
4953 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4956 /* Extract enumerator values and other non-parms declared with the parms.
4957 Likewise any forward parm decls that didn't have real parm decls. */
4958 for (decl = parms; decl; )
4960 tree next = TREE_CHAIN (decl);
4962 if (TREE_CODE (decl) != PARM_DECL)
4964 TREE_CHAIN (decl) = new_parms;
4967 else if (TREE_ASM_WRITTEN (decl))
4969 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4970 TREE_CHAIN (decl) = new_parms;
4976 /* Put the parm decls back in the order they were in in the parm list. */
4977 for (t = order; t; t = TREE_CHAIN (t))
4980 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4982 TREE_CHAIN (TREE_VALUE (t)) = 0;
4985 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4988 /* Store the parmlist in the binding level since the old one
4989 is no longer a valid list. (We have changed the chain pointers.) */
4990 storedecls (new_parms);
4992 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4993 /* There may also be declarations for enumerators if an enumeration
4994 type is declared among the parms. Ignore them here. */
4995 if (TREE_CODE (decl) == PARM_DECL)
4997 /* Since there is a prototype,
4998 args are passed in their declared types. */
4999 tree type = TREE_TYPE (decl);
5000 DECL_ARG_TYPE (decl) = type;
5001 if (PROMOTE_PROTOTYPES
5002 && (TREE_CODE (type) == INTEGER_TYPE
5003 || TREE_CODE (type) == ENUMERAL_TYPE)
5004 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5005 DECL_ARG_TYPE (decl) = integer_type_node;
5007 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5008 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5009 && DECL_NAME (decl) == 0)
5011 error ("`void' in parameter list must be the entire list");
5017 return tree_cons (new_parms, tags,
5018 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5020 return tree_cons (new_parms, tags, nreverse (types));
5023 /* At end of parameter list, warn about any struct, union or enum tags
5024 defined within. Do so because these types cannot ever become complete. */
5027 parmlist_tags_warning ()
5032 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5034 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5035 /* An anonymous union parm type is meaningful as a GNU extension.
5036 So don't warn for that. */
5037 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5039 if (TREE_PURPOSE (elt) != 0)
5040 warning ("`%s %s' declared inside parameter list",
5041 (code == RECORD_TYPE ? "struct"
5042 : code == UNION_TYPE ? "union"
5044 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5046 warning ("anonymous %s declared inside parameter list",
5047 (code == RECORD_TYPE ? "struct"
5048 : code == UNION_TYPE ? "union"
5053 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5059 /* Get the struct, enum or union (CODE says which) with tag NAME.
5060 Define the tag as a forward-reference if it is not defined. */
5063 xref_tag (code, name)
5064 enum tree_code code;
5067 /* If a cross reference is requested, look up the type
5068 already defined for this tag and return it. */
5070 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5071 /* Even if this is the wrong type of tag, return what we found.
5072 There will be an error message anyway, from pending_xref_error.
5073 If we create an empty xref just for an invalid use of the type,
5074 the main result is to create lots of superfluous error messages. */
5078 /* If no such tag is yet defined, create a forward-reference node
5079 and record it as the "definition".
5080 When a real declaration of this type is found,
5081 the forward-reference will be altered into a real type. */
5083 ref = make_node (code);
5084 if (code == ENUMERAL_TYPE)
5086 /* (In ANSI, Enums can be referred to only if already defined.) */
5088 pedwarn ("ANSI C forbids forward references to `enum' types");
5089 /* Give the type a default layout like unsigned int
5090 to avoid crashing if it does not get defined. */
5091 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5092 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5093 TREE_UNSIGNED (ref) = 1;
5094 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5095 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5096 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5099 pushtag (name, ref);
5104 /* Make sure that the tag NAME is defined *in the current binding level*
5105 at least as a forward reference.
5106 CODE says which kind of tag NAME ought to be. */
5109 start_struct (code, name)
5110 enum tree_code code;
5113 /* If there is already a tag defined at this binding level
5114 (as a forward reference), just return it. */
5116 register tree ref = 0;
5119 ref = lookup_tag (code, name, current_binding_level, 1);
5120 if (ref && TREE_CODE (ref) == code)
5122 C_TYPE_BEING_DEFINED (ref) = 1;
5123 TYPE_PACKED (ref) = flag_pack_struct;
5124 if (TYPE_FIELDS (ref))
5125 error ("redefinition of `%s %s'",
5126 code == UNION_TYPE ? "union" : "struct",
5127 IDENTIFIER_POINTER (name));
5132 /* Otherwise create a forward-reference just so the tag is in scope. */
5134 ref = make_node (code);
5135 pushtag (name, ref);
5136 C_TYPE_BEING_DEFINED (ref) = 1;
5137 TYPE_PACKED (ref) = flag_pack_struct;
5141 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5142 of a structure component, returning a FIELD_DECL node.
5143 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5145 This is done during the parsing of the struct declaration.
5146 The FIELD_DECL nodes are chained together and the lot of them
5147 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5150 grokfield (filename, line, declarator, declspecs, width)
5151 const char *filename ATTRIBUTE_UNUSED;
5152 int line ATTRIBUTE_UNUSED;
5153 tree declarator, declspecs, width;
5157 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5159 finish_decl (value, NULL_TREE, NULL_TREE);
5160 DECL_INITIAL (value) = width;
5162 maybe_objc_check_decl (value);
5166 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5167 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5168 ATTRIBUTES are attributes to be applied to the structure. */
5171 finish_struct (t, fieldlist, attributes)
5177 int toplevel = global_binding_level == current_binding_level;
5179 /* If this type was previously laid out as a forward reference,
5180 make sure we lay it out again. */
5184 decl_attributes (t, attributes, NULL_TREE);
5186 /* Nameless union parm types are useful as GCC extension. */
5187 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5188 /* Otherwise, warn about any struct or union def. in parmlist. */
5189 if (in_parm_level_p ())
5192 pedwarn ("%s defined inside parms",
5193 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5194 else if (! flag_traditional)
5195 warning ("%s defined inside parms",
5196 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5201 for (x = fieldlist; x; x = TREE_CHAIN (x))
5202 if (DECL_NAME (x) != 0)
5206 pedwarn ("%s has no %smembers",
5207 TREE_CODE (t) == UNION_TYPE ? "union" : "struct",
5208 fieldlist ? "named " : "");
5211 /* Install struct as DECL_CONTEXT of each field decl.
5212 Also process specified field sizes,m which is found in the DECL_INITIAL.
5213 Store 0 there, except for ": 0" fields (so we can find them
5214 and delete them, below). */
5216 for (x = fieldlist; x; x = TREE_CHAIN (x))
5218 DECL_CONTEXT (x) = t;
5219 DECL_PACKED (x) |= TYPE_PACKED (t);
5221 /* If any field is const, the structure type is pseudo-const. */
5222 if (TREE_READONLY (x))
5223 C_TYPE_FIELDS_READONLY (t) = 1;
5226 /* A field that is pseudo-const makes the structure likewise. */
5227 tree t1 = TREE_TYPE (x);
5228 while (TREE_CODE (t1) == ARRAY_TYPE)
5229 t1 = TREE_TYPE (t1);
5230 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5231 && C_TYPE_FIELDS_READONLY (t1))
5232 C_TYPE_FIELDS_READONLY (t) = 1;
5235 /* Any field that is volatile means variables of this type must be
5236 treated in some ways as volatile. */
5237 if (TREE_THIS_VOLATILE (x))
5238 C_TYPE_FIELDS_VOLATILE (t) = 1;
5240 /* Any field of nominal variable size implies structure is too. */
5241 if (C_DECL_VARIABLE_SIZE (x))
5242 C_TYPE_VARIABLE_SIZE (t) = 1;
5244 /* Detect invalid nested redefinition. */
5245 if (TREE_TYPE (x) == t)
5246 error ("nested redefinition of `%s'",
5247 IDENTIFIER_POINTER (TYPE_NAME (t)));
5249 /* Detect invalid bit-field size. */
5250 if (DECL_INITIAL (x))
5251 STRIP_NOPS (DECL_INITIAL (x));
5252 if (DECL_INITIAL (x))
5254 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5255 constant_expression_warning (DECL_INITIAL (x));
5259 "bit-field `%s' width not an integer constant");
5260 DECL_INITIAL (x) = NULL;
5264 /* Detect invalid bit-field type. */
5265 if (DECL_INITIAL (x)
5266 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5267 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5269 error_with_decl (x, "bit-field `%s' has invalid type");
5270 DECL_INITIAL (x) = NULL;
5273 if (DECL_INITIAL (x) && pedantic
5274 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5275 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5276 /* Accept an enum that's equivalent to int or unsigned int. */
5277 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5278 && (TYPE_PRECISION (TREE_TYPE (x))
5279 == TYPE_PRECISION (integer_type_node))))
5280 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5282 /* Detect and ignore out of range field width and process valid
5284 if (DECL_INITIAL (x))
5286 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5287 error_with_decl (x, "negative width in bit-field `%s'");
5288 else if (0 < compare_tree_int (DECL_INITIAL (x),
5289 TYPE_PRECISION (TREE_TYPE (x))))
5290 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5291 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5292 error_with_decl (x, "zero width for bit-field `%s'");
5295 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5296 unsigned HOST_WIDE_INT width
5297 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5299 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5300 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5301 TREE_UNSIGNED (TREE_TYPE (x)))
5303 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5304 TREE_UNSIGNED (TREE_TYPE (x))))))
5305 warning_with_decl (x,
5306 "`%s' is narrower than values of its type");
5308 DECL_SIZE (x) = bitsize_int (width);
5309 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5313 /* field size 0 => force desired amount of alignment. */
5314 #ifdef EMPTY_FIELD_BOUNDARY
5315 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5317 #ifdef PCC_BITFIELD_TYPE_MATTERS
5318 if (PCC_BITFIELD_TYPE_MATTERS)
5319 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5320 TYPE_ALIGN (TREE_TYPE (x)));
5326 else if (TREE_TYPE (x) != error_mark_node)
5328 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5329 : TYPE_ALIGN (TREE_TYPE (x)));
5331 /* Non-bit-fields are aligned for their type, except packed
5332 fields which require only BITS_PER_UNIT alignment. */
5333 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5336 DECL_INITIAL (x) = 0;
5339 /* Delete all duplicate fields from the fieldlist */
5340 for (x = fieldlist; x && TREE_CHAIN (x);)
5341 /* Anonymous fields aren't duplicates. */
5342 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5346 register tree y = fieldlist;
5350 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5356 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5358 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5359 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5361 else x = TREE_CHAIN (x);
5364 /* Now we have the nearly final fieldlist. Record it,
5365 then lay out the structure or union (including the fields). */
5367 TYPE_FIELDS (t) = fieldlist;
5371 /* Delete all zero-width bit-fields from the fieldlist */
5373 tree *fieldlistp = &fieldlist;
5375 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5376 *fieldlistp = TREE_CHAIN (*fieldlistp);
5378 fieldlistp = &TREE_CHAIN (*fieldlistp);
5381 /* Now we have the truly final field list.
5382 Store it in this type and in the variants. */
5384 TYPE_FIELDS (t) = fieldlist;
5386 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5388 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5389 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5390 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5393 /* If this was supposed to be a transparent union, but we can't
5394 make it one, warn and turn off the flag. */
5395 if (TREE_CODE (t) == UNION_TYPE
5396 && TYPE_TRANSPARENT_UNION (t)
5397 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5399 TYPE_TRANSPARENT_UNION (t) = 0;
5400 warning ("union cannot be made transparent");
5403 /* If this structure or union completes the type of any previous
5404 variable declaration, lay it out and output its rtl. */
5406 if (current_binding_level->n_incomplete != 0)
5409 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5411 if (TREE_TYPE (decl) == t
5412 && TREE_CODE (decl) != TYPE_DECL)
5414 layout_decl (decl, 0);
5415 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5416 maybe_objc_check_decl (decl);
5417 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5420 --current_binding_level->n_incomplete;
5422 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5423 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5425 tree element = TREE_TYPE (decl);
5426 while (TREE_CODE (element) == ARRAY_TYPE)
5427 element = TREE_TYPE (element);
5429 layout_array_type (TREE_TYPE (decl));
5434 /* Finish debugging output for this type. */
5435 rest_of_type_compilation (t, toplevel);
5440 /* Lay out the type T, and its element type, and so on. */
5443 layout_array_type (t)
5446 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5447 layout_array_type (TREE_TYPE (t));
5451 /* Begin compiling the definition of an enumeration type.
5452 NAME is its name (or null if anonymous).
5453 Returns the type object, as yet incomplete.
5454 Also records info about it so that build_enumerator
5455 may be used to declare the individual values as they are read. */
5461 register tree enumtype = 0;
5463 /* If this is the real definition for a previous forward reference,
5464 fill in the contents in the same object that used to be the
5465 forward reference. */
5468 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5470 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5472 enumtype = make_node (ENUMERAL_TYPE);
5473 pushtag (name, enumtype);
5476 C_TYPE_BEING_DEFINED (enumtype) = 1;
5478 if (TYPE_VALUES (enumtype) != 0)
5480 /* This enum is a named one that has been declared already. */
5481 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5483 /* Completely replace its old definition.
5484 The old enumerators remain defined, however. */
5485 TYPE_VALUES (enumtype) = 0;
5488 enum_next_value = integer_zero_node;
5491 if (flag_short_enums)
5492 TYPE_PACKED (enumtype) = 1;
5497 /* After processing and defining all the values of an enumeration type,
5498 install their decls in the enumeration type and finish it off.
5499 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5500 and ATTRIBUTES are the specified attributes.
5501 Returns ENUMTYPE. */
5504 finish_enum (enumtype, values, attributes)
5509 register tree pair, tem;
5510 tree minnode = 0, maxnode = 0;
5511 int precision, unsign;
5512 int toplevel = (global_binding_level == current_binding_level);
5514 if (in_parm_level_p ())
5515 warning ("enum defined inside parms");
5517 decl_attributes (enumtype, attributes, NULL_TREE);
5519 /* Calculate the maximum value of any enumerator in this type. */
5521 if (values == error_mark_node)
5522 minnode = maxnode = integer_zero_node;
5525 minnode = maxnode = TREE_VALUE (values);
5526 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5528 tree value = TREE_VALUE (pair);
5529 if (tree_int_cst_lt (maxnode, value))
5531 if (tree_int_cst_lt (value, minnode))
5536 /* Construct the final type of this enumeration. It is the same
5537 as one of the integral types - the narrowest one that fits, except
5538 that normally we only go as narrow as int - and signed iff any of
5539 the values are negative. */
5540 unsign = (tree_int_cst_sgn (minnode) >= 0);
5541 precision = MAX (min_precision (minnode, unsign),
5542 min_precision (maxnode, unsign));
5543 if (!TYPE_PACKED (enumtype))
5544 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5545 if (type_for_size (precision, unsign) == 0)
5547 warning ("enumeration values exceed range of largest integer");
5548 precision = TYPE_PRECISION (long_long_integer_type_node);
5551 TYPE_MIN_VALUE (enumtype) = minnode;
5552 TYPE_MAX_VALUE (enumtype) = maxnode;
5553 TYPE_PRECISION (enumtype) = precision;
5554 TREE_UNSIGNED (enumtype) = unsign;
5555 TYPE_SIZE (enumtype) = 0;
5556 layout_type (enumtype);
5558 if (values != error_mark_node)
5560 /* Change the type of the enumerators to be the enum type. We
5561 need to do this irrespective of the size of the enum, for
5562 proper type checking. Replace the DECL_INITIALs of the
5563 enumerators, and the value slots of the list, with copies
5564 that have the enum type; they cannot be modified in place
5565 because they may be shared (e.g. integer_zero_node) Finally,
5566 change the purpose slots to point to the names of the decls. */
5567 for (pair = values; pair; pair = TREE_CHAIN (pair))
5569 tree enu = TREE_PURPOSE (pair);
5571 TREE_TYPE (enu) = enumtype;
5572 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5573 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5574 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5575 DECL_MODE (enu) = TYPE_MODE (enumtype);
5576 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5578 TREE_PURPOSE (pair) = DECL_NAME (enu);
5579 TREE_VALUE (pair) = DECL_INITIAL (enu);
5582 TYPE_VALUES (enumtype) = values;
5585 /* Fix up all variant types of this enum type. */
5586 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5588 if (tem == enumtype)
5590 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5591 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5592 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5593 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5594 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5595 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5596 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5597 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5598 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5601 /* Finish debugging output for this type. */
5602 rest_of_type_compilation (enumtype, toplevel);
5607 /* Build and install a CONST_DECL for one value of the
5608 current enumeration type (one that was begun with start_enum).
5609 Return a tree-list containing the CONST_DECL and its value.
5610 Assignment of sequential values by default is handled here. */
5613 build_enumerator (name, value)
5616 register tree decl, type;
5618 /* Validate and default VALUE. */
5620 /* Remove no-op casts from the value. */
5622 STRIP_TYPE_NOPS (value);
5626 if (TREE_CODE (value) == INTEGER_CST)
5628 value = default_conversion (value);
5629 constant_expression_warning (value);
5633 error ("enumerator value for `%s' not integer constant",
5634 IDENTIFIER_POINTER (name));
5639 /* Default based on previous value. */
5640 /* It should no longer be possible to have NON_LVALUE_EXPR
5644 value = enum_next_value;
5646 error ("overflow in enumeration values");
5649 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5651 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5652 value = integer_zero_node;
5655 /* Set basis for default for next value. */
5656 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5657 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5659 /* Now create a declaration for the enum value name. */
5661 type = TREE_TYPE (value);
5662 type = type_for_size (MAX (TYPE_PRECISION (type),
5663 TYPE_PRECISION (integer_type_node)),
5665 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5666 && TREE_UNSIGNED (type)));
5668 decl = build_decl (CONST_DECL, name, type);
5669 DECL_INITIAL (decl) = convert (type, value);
5672 return tree_cons (decl, value, NULL_TREE);
5675 /* Create the FUNCTION_DECL for a function definition.
5676 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5677 the declaration; they describe the function's name and the type it returns,
5678 but twisted together in a fashion that parallels the syntax of C.
5680 This function creates a binding context for the function body
5681 as well as setting up the FUNCTION_DECL in current_function_decl.
5683 Returns 1 on success. If the DECLARATOR is not suitable for a function
5684 (it defines a datum instead), we return 0, which tells
5685 yyparse to report a parse error. */
5688 start_function (declspecs, declarator, prefix_attributes, attributes)
5689 tree declarator, declspecs, prefix_attributes, attributes;
5691 tree decl1, old_decl;
5693 int old_immediate_size_expand = immediate_size_expand;
5695 current_function_returns_value = 0; /* Assume, until we see it does. */
5696 current_function_returns_null = 0;
5697 warn_about_return_type = 0;
5698 current_extern_inline = 0;
5699 c_function_varargs = 0;
5701 shadowed_labels = 0;
5703 /* Don't expand any sizes in the return type of the function. */
5704 immediate_size_expand = 0;
5706 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5708 /* If the declarator is not suitable for a function definition,
5709 cause a syntax error. */
5712 immediate_size_expand = old_immediate_size_expand;
5716 decl_attributes (decl1, prefix_attributes, attributes);
5718 announce_function (decl1);
5720 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5722 error ("return-type is an incomplete type");
5723 /* Make it return void instead. */
5725 = build_function_type (void_type_node,
5726 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5729 if (warn_about_return_type)
5730 warning ("return-type defaults to `int'");
5732 /* Save the parm names or decls from this function's declarator
5733 where store_parm_decls will find them. */
5734 current_function_parms = last_function_parms;
5735 current_function_parm_tags = last_function_parm_tags;
5737 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5738 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5739 DECL_INITIAL (decl1) = error_mark_node;
5741 /* If this definition isn't a prototype and we had a prototype declaration
5742 before, copy the arg type info from that prototype.
5743 But not if what we had before was a builtin function. */
5744 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5745 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5746 && !DECL_BUILT_IN (old_decl)
5747 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5748 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5749 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5751 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5752 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5753 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5756 /* If there is no explicit declaration, look for any out-of-scope implicit
5759 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5761 /* Optionally warn of old-fashioned def with no previous prototype. */
5762 if (warn_strict_prototypes
5763 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5764 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5765 warning ("function declaration isn't a prototype");
5766 /* Optionally warn of any global def with no previous prototype. */
5767 else if (warn_missing_prototypes
5768 && TREE_PUBLIC (decl1)
5769 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5770 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5771 warning_with_decl (decl1, "no previous prototype for `%s'");
5772 /* Optionally warn of any def with no previous prototype
5773 if the function has already been used. */
5774 else if (warn_missing_prototypes
5775 && old_decl != 0 && TREE_USED (old_decl)
5776 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5777 warning_with_decl (decl1,
5778 "`%s' was used with no prototype before its definition");
5779 /* Optionally warn of any global def with no previous declaration. */
5780 else if (warn_missing_declarations
5781 && TREE_PUBLIC (decl1)
5783 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5784 warning_with_decl (decl1, "no previous declaration for `%s'");
5785 /* Optionally warn of any def with no previous declaration
5786 if the function has already been used. */
5787 else if (warn_missing_declarations
5788 && old_decl != 0 && TREE_USED (old_decl)
5789 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5790 warning_with_decl (decl1,
5791 "`%s' was used with no declaration before its definition");
5793 /* This is a definition, not a reference.
5794 So normally clear DECL_EXTERNAL.
5795 However, `extern inline' acts like a declaration
5796 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5797 DECL_EXTERNAL (decl1) = current_extern_inline;
5799 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5800 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5803 /* This function exists in static storage.
5804 (This does not mean `static' in the C sense!) */
5805 TREE_STATIC (decl1) = 1;
5807 /* A nested function is not global. */
5808 if (current_function_decl != 0)
5809 TREE_PUBLIC (decl1) = 0;
5811 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5813 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5818 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5819 != integer_type_node)
5820 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5822 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5823 args = TREE_CHAIN (args))
5825 tree type = args ? TREE_VALUE (args) : 0;
5827 if (type == void_type_node)
5834 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5835 pedwarn_with_decl (decl1,
5836 "first argument of `%s' should be `int'");
5840 if (TREE_CODE (type) != POINTER_TYPE
5841 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5842 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5844 pedwarn_with_decl (decl1,
5845 "second argument of `%s' should be `char **'");
5849 if (TREE_CODE (type) != POINTER_TYPE
5850 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5851 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5853 pedwarn_with_decl (decl1,
5854 "third argument of `%s' should probably be `char **'");
5859 /* It is intentional that this message does not mention the third
5860 argument, which is warned for only pedantically, because it's
5861 blessed by mention in an appendix of the standard. */
5862 if (argct > 0 && (argct < 2 || argct > 3))
5863 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5865 if (argct == 3 && pedantic)
5866 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5868 if (! TREE_PUBLIC (decl1))
5869 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5872 /* Record the decl so that the function name is defined.
5873 If we already have a decl for this name, and it is a FUNCTION_DECL,
5874 use the old decl. */
5876 current_function_decl = pushdecl (decl1);
5879 declare_parm_level (1);
5880 current_binding_level->subblocks_tag_transparent = 1;
5882 make_function_rtl (current_function_decl);
5884 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5885 /* Promote the value to int before returning it. */
5886 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5888 /* It retains unsignedness if traditional
5889 or if not really getting wider. */
5890 if (TREE_UNSIGNED (restype)
5891 && (flag_traditional
5892 || (TYPE_PRECISION (restype)
5893 == TYPE_PRECISION (integer_type_node))))
5894 restype = unsigned_type_node;
5896 restype = integer_type_node;
5898 DECL_RESULT (current_function_decl)
5899 = build_decl (RESULT_DECL, NULL_TREE, restype);
5901 /* If this fcn was already referenced via a block-scope `extern' decl
5902 (or an implicit decl), propagate certain information about the usage. */
5903 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5904 TREE_ADDRESSABLE (current_function_decl) = 1;
5906 immediate_size_expand = old_immediate_size_expand;
5911 /* Record that this function is going to be a varargs function.
5912 This is called before store_parm_decls, which is too early
5913 to call mark_varargs directly. */
5918 c_function_varargs = 1;
5921 /* Store the parameter declarations into the current function declaration.
5922 This is called after parsing the parameter declarations, before
5923 digesting the body of the function.
5925 For an old-style definition, modify the function's type
5926 to specify at least the number of arguments. */
5931 register tree fndecl = current_function_decl;
5934 /* This is either a chain of PARM_DECLs (if a prototype was used)
5935 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5936 tree specparms = current_function_parms;
5938 /* This is a list of types declared among parms in a prototype. */
5939 tree parmtags = current_function_parm_tags;
5941 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5942 register tree parmdecls = getdecls ();
5944 /* This is a chain of any other decls that came in among the parm
5945 declarations. If a parm is declared with enum {foo, bar} x;
5946 then CONST_DECLs for foo and bar are put here. */
5949 /* Nonzero if this definition is written with a prototype. */
5952 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5954 /* This case is when the function was defined with an ANSI prototype.
5955 The parms already have decls, so we need not do anything here
5956 except record them as in effect
5957 and complain if any redundant old-style parm decls were written. */
5968 error_with_decl (fndecl,
5969 "parm types given both in parmlist and separately");
5970 /* Get rid of the erroneous decls; don't keep them on
5971 the list of parms, since they might not be PARM_DECLs. */
5972 for (decl = current_binding_level->names;
5973 decl; decl = TREE_CHAIN (decl))
5974 if (DECL_NAME (decl))
5975 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5976 for (link = current_binding_level->shadowed;
5977 link; link = TREE_CHAIN (link))
5978 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5979 current_binding_level->names = 0;
5980 current_binding_level->shadowed = 0;
5983 specparms = nreverse (specparms);
5984 for (parm = specparms; parm; parm = next)
5986 next = TREE_CHAIN (parm);
5987 if (TREE_CODE (parm) == PARM_DECL)
5989 if (DECL_NAME (parm) == 0)
5990 error_with_decl (parm, "parameter name omitted");
5991 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5992 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5995 error_with_decl (parm, "parameter `%s' declared void");
5996 /* Change the type to error_mark_node so this parameter
5997 will be ignored by assign_parms. */
5998 TREE_TYPE (parm) = error_mark_node;
6004 /* If we find an enum constant or a type tag,
6005 put it aside for the moment. */
6006 TREE_CHAIN (parm) = 0;
6007 others = chainon (others, parm);
6011 /* Get the decls in their original chain order
6012 and record in the function. */
6013 DECL_ARGUMENTS (fndecl) = getdecls ();
6016 /* If this function takes a variable number of arguments,
6017 add a phony parameter to the end of the parm list,
6018 to represent the position of the first unnamed argument. */
6019 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6022 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6023 /* Let's hope the address of the unnamed parm
6024 won't depend on its type. */
6025 TREE_TYPE (dummy) = integer_type_node;
6026 DECL_ARG_TYPE (dummy) = integer_type_node;
6027 DECL_ARGUMENTS (fndecl)
6028 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6032 /* Now pushdecl the enum constants. */
6033 for (parm = others; parm; parm = next)
6035 next = TREE_CHAIN (parm);
6036 if (DECL_NAME (parm) == 0)
6038 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6040 else if (TREE_CODE (parm) != PARM_DECL)
6044 storetags (chainon (parmtags, gettags ()));
6048 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6049 each with a parm name as the TREE_VALUE.
6051 PARMDECLS is a chain of declarations for parameters.
6052 Warning! It can also contain CONST_DECLs which are not parameters
6053 but are names of enumerators of any enum types
6054 declared among the parameters.
6056 First match each formal parameter name with its declaration.
6057 Associate decls with the names and store the decls
6058 into the TREE_PURPOSE slots. */
6060 /* We use DECL_WEAK as a flag to show which parameters have been
6061 seen already since it is not used on PARM_DECL or CONST_DECL. */
6062 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6063 DECL_WEAK (parm) = 0;
6065 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6067 register tree tail, found = NULL;
6069 if (TREE_VALUE (parm) == 0)
6071 error_with_decl (fndecl,
6072 "parameter name missing from parameter list");
6073 TREE_PURPOSE (parm) = 0;
6077 /* See if any of the parmdecls specifies this parm by name.
6078 Ignore any enumerator decls. */
6079 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6080 if (DECL_NAME (tail) == TREE_VALUE (parm)
6081 && TREE_CODE (tail) == PARM_DECL)
6087 /* If declaration already marked, we have a duplicate name.
6088 Complain, and don't use this decl twice. */
6089 if (found && DECL_WEAK (found))
6091 error_with_decl (found, "multiple parameters named `%s'");
6095 /* If the declaration says "void", complain and ignore it. */
6096 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6098 error_with_decl (found, "parameter `%s' declared void");
6099 TREE_TYPE (found) = integer_type_node;
6100 DECL_ARG_TYPE (found) = integer_type_node;
6101 layout_decl (found, 0);
6104 /* Traditionally, a parm declared float is actually a double. */
6105 if (found && flag_traditional
6106 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6108 TREE_TYPE (found) = double_type_node;
6109 DECL_ARG_TYPE (found) = double_type_node;
6110 layout_decl (found, 0);
6113 /* If no declaration found, default to int. */
6116 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6118 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6119 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6120 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6122 warning_with_decl (found, "type of `%s' defaults to `int'");
6126 TREE_PURPOSE (parm) = found;
6128 /* Mark this decl as "already found" */
6129 DECL_WEAK (found) = 1;
6132 /* Put anything which is on the parmdecls chain and which is
6133 not a PARM_DECL onto the list NONPARMS. (The types of
6134 non-parm things which might appear on the list include
6135 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6136 any actual PARM_DECLs not matched with any names. */
6139 for (parm = parmdecls; parm; )
6141 tree next = TREE_CHAIN (parm);
6142 TREE_CHAIN (parm) = 0;
6144 if (TREE_CODE (parm) != PARM_DECL)
6145 nonparms = chainon (nonparms, parm);
6148 /* Complain about args with incomplete types. */
6149 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6151 error_with_decl (parm, "parameter `%s' has incomplete type");
6152 TREE_TYPE (parm) = error_mark_node;
6155 if (! DECL_WEAK (parm))
6157 error_with_decl (parm,
6158 "declaration for parameter `%s' but no such parameter");
6159 /* Pretend the parameter was not missing.
6160 This gets us to a standard state and minimizes
6161 further error messages. */
6163 = chainon (specparms,
6164 tree_cons (parm, NULL_TREE, NULL_TREE));
6171 /* Chain the declarations together in the order of the list of names. */
6172 /* Store that chain in the function decl, replacing the list of names. */
6174 DECL_ARGUMENTS (fndecl) = 0;
6177 for (last = 0; parm; parm = TREE_CHAIN (parm))
6178 if (TREE_PURPOSE (parm))
6181 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6183 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6184 last = TREE_PURPOSE (parm);
6185 TREE_CHAIN (last) = 0;
6189 /* If there was a previous prototype,
6190 set the DECL_ARG_TYPE of each argument according to
6191 the type previously specified, and report any mismatches. */
6193 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6196 for (parm = DECL_ARGUMENTS (fndecl),
6197 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6198 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6199 != void_type_node));
6200 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6202 if (parm == 0 || type == 0
6203 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6205 error ("number of arguments doesn't match prototype");
6206 error_with_file_and_line (current_function_prototype_file,
6207 current_function_prototype_line,
6208 "prototype declaration");
6211 /* Type for passing arg must be consistent
6212 with that declared for the arg. */
6213 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6215 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6216 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6218 /* Adjust argument to match prototype. E.g. a previous
6219 `int foo(float);' prototype causes
6220 `int foo(x) float x; {...}' to be treated like
6221 `int foo(float x) {...}'. This is particularly
6222 useful for argument types like uid_t. */
6223 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6225 if (PROMOTE_PROTOTYPES
6226 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6227 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6228 && TYPE_PRECISION (TREE_TYPE (parm))
6229 < TYPE_PRECISION (integer_type_node))
6230 DECL_ARG_TYPE (parm) = integer_type_node;
6234 pedwarn ("promoted argument `%s' doesn't match prototype",
6235 IDENTIFIER_POINTER (DECL_NAME (parm)));
6236 warning_with_file_and_line
6237 (current_function_prototype_file,
6238 current_function_prototype_line,
6239 "prototype declaration");
6242 /* If -traditional, allow `int' argument to match
6243 `unsigned' prototype. */
6244 else if (! (flag_traditional
6245 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6246 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6248 error ("argument `%s' doesn't match prototype",
6249 IDENTIFIER_POINTER (DECL_NAME (parm)));
6250 error_with_file_and_line (current_function_prototype_file,
6251 current_function_prototype_line,
6252 "prototype declaration");
6256 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6259 /* Otherwise, create a prototype that would match. */
6263 tree actual = 0, last = 0, type;
6265 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6267 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6269 TREE_CHAIN (last) = type;
6274 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6276 TREE_CHAIN (last) = type;
6280 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6281 of the type of this function, but we need to avoid having this
6282 affect the types of other similarly-typed functions, so we must
6283 first force the generation of an identical (but separate) type
6284 node for the relevant function type. The new node we create
6285 will be a variant of the main variant of the original function
6288 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6290 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6293 /* Now store the final chain of decls for the arguments
6294 as the decl-chain of the current lexical scope.
6295 Put the enumerators in as well, at the front so that
6296 DECL_ARGUMENTS is not modified. */
6298 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6301 /* Make sure the binding level for the top of the function body
6302 gets a BLOCK if there are any in the function.
6303 Otherwise, the dbx output is wrong. */
6305 keep_next_if_subblocks = 1;
6307 /* ??? This might be an improvement,
6308 but needs to be thought about some more. */
6310 keep_next_level_flag = 1;
6313 /* Write a record describing this function definition to the prototypes
6314 file (if requested). */
6316 gen_aux_info_record (fndecl, 1, 0, prototype);
6318 /* Initialize the RTL code for the function. */
6320 init_function_start (fndecl, input_filename, lineno);
6322 /* If this is a varargs function, inform function.c. */
6324 if (c_function_varargs)
6327 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6329 declare_function_name ();
6331 /* Set up parameters and prepare for return, for the function. */
6333 expand_function_start (fndecl, 0);
6335 /* If this function is `main', emit a call to `__main'
6336 to run global initializers, etc. */
6337 if (DECL_NAME (fndecl)
6338 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6339 && DECL_CONTEXT (fndecl) == NULL_TREE)
6340 expand_main_function ();
6343 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6344 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6345 stands for an ellipsis in the identifier list.
6347 PARMLIST is the data returned by get_parm_info for the
6348 parmlist that follows the semicolon.
6350 We return a value of the same sort that get_parm_info returns,
6351 except that it describes the combination of identifiers and parmlist. */
6354 combine_parm_decls (specparms, parmlist, void_at_end)
6355 tree specparms, parmlist;
6358 register tree fndecl = current_function_decl;
6361 tree parmdecls = TREE_PURPOSE (parmlist);
6363 /* This is a chain of any other decls that came in among the parm
6364 declarations. They were separated already by get_parm_info,
6365 so we just need to keep them separate. */
6366 tree nonparms = TREE_VALUE (parmlist);
6370 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6371 DECL_WEAK (parm) = 0;
6373 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6375 register tree tail, found = NULL;
6377 /* See if any of the parmdecls specifies this parm by name. */
6378 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6379 if (DECL_NAME (tail) == TREE_VALUE (parm))
6385 /* If declaration already marked, we have a duplicate name.
6386 Complain, and don't use this decl twice. */
6387 if (found && DECL_WEAK (found))
6389 error_with_decl (found, "multiple parameters named `%s'");
6393 /* If the declaration says "void", complain and ignore it. */
6394 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6396 error_with_decl (found, "parameter `%s' declared void");
6397 TREE_TYPE (found) = integer_type_node;
6398 DECL_ARG_TYPE (found) = integer_type_node;
6399 layout_decl (found, 0);
6402 /* Traditionally, a parm declared float is actually a double. */
6403 if (found && flag_traditional
6404 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6406 TREE_TYPE (found) = double_type_node;
6407 DECL_ARG_TYPE (found) = double_type_node;
6408 layout_decl (found, 0);
6411 /* If no declaration found, default to int. */
6414 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6416 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6417 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6418 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6419 error_with_decl (found, "type of parameter `%s' is not declared");
6423 TREE_PURPOSE (parm) = found;
6425 /* Mark this decl as "already found". */
6426 DECL_WEAK (found) = 1;
6429 /* Complain about any actual PARM_DECLs not matched with any names. */
6431 for (parm = parmdecls; parm; )
6433 tree next = TREE_CHAIN (parm);
6434 TREE_CHAIN (parm) = 0;
6436 /* Complain about args with incomplete types. */
6437 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6439 error_with_decl (parm, "parameter `%s' has incomplete type");
6440 TREE_TYPE (parm) = error_mark_node;
6443 if (! DECL_WEAK (parm))
6445 error_with_decl (parm,
6446 "declaration for parameter `%s' but no such parameter");
6447 /* Pretend the parameter was not missing.
6448 This gets us to a standard state and minimizes
6449 further error messages. */
6451 = chainon (specparms,
6452 tree_cons (parm, NULL_TREE, NULL_TREE));
6458 /* Chain the declarations together in the order of the list of names.
6459 At the same time, build up a list of their types, in reverse order. */
6465 for (last = 0; parm; parm = TREE_CHAIN (parm))
6466 if (TREE_PURPOSE (parm))
6469 parmdecls = TREE_PURPOSE (parm);
6471 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6472 last = TREE_PURPOSE (parm);
6473 TREE_CHAIN (last) = 0;
6475 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6480 return tree_cons (parmdecls, nonparms,
6481 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6483 return tree_cons (parmdecls, nonparms, nreverse (types));
6486 /* Finish up a function declaration and compile that function
6487 all the way to assembler language output. The free the storage
6488 for the function definition.
6490 This is called after parsing the body of the function definition.
6492 NESTED is nonzero if the function being finished is nested in another. */
6495 finish_function (nested)
6498 register tree fndecl = current_function_decl;
6500 /* TREE_READONLY (fndecl) = 1;
6501 This caused &foo to be of type ptr-to-const-function
6502 which then got a warning when stored in a ptr-to-function variable. */
6505 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6507 /* Must mark the RESULT_DECL as being in this function. */
6509 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6511 /* Obey `register' declarations if `setjmp' is called in this fn. */
6512 if (flag_traditional && current_function_calls_setjmp)
6514 setjmp_protect (DECL_INITIAL (fndecl));
6515 setjmp_protect_args ();
6518 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6520 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6521 != integer_type_node)
6523 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6524 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6526 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6530 #ifdef DEFAULT_MAIN_RETURN
6531 /* Make it so that `main' always returns success by default. */
6532 DEFAULT_MAIN_RETURN;
6537 /* Generate rtl for function exit. */
6538 expand_function_end (input_filename, lineno, 0);
6540 /* So we can tell if jump_optimize sets it to 1. */
6543 /* If this is a nested function, protect the local variables in the stack
6544 above us from being collected while we're compiling this function. */
6546 ggc_push_context ();
6548 /* Run the optimizers and output the assembler code for this function. */
6549 rest_of_compilation (fndecl);
6551 /* Undo the GC context switch. */
6555 current_function_returns_null |= can_reach_end;
6557 if (warn_missing_noreturn
6558 && !TREE_THIS_VOLATILE (fndecl)
6559 && !current_function_returns_null
6560 && !current_function_returns_value)
6561 warning ("function might be possible candidate for attribute `noreturn'");
6563 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6564 warning ("`noreturn' function does return");
6565 else if (warn_return_type && can_reach_end
6566 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6567 /* If this function returns non-void and control can drop through,
6569 warning ("control reaches end of non-void function");
6570 /* With just -W, complain only if function returns both with
6571 and without a value. */
6572 else if (extra_warnings
6573 && current_function_returns_value && current_function_returns_null)
6574 warning ("this function may return with or without a value");
6576 /* If requested, warn about function definitions where the function will
6577 return a value (usually of some struct or union type) which itself will
6578 take up a lot of stack space. */
6580 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6582 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6584 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6585 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6588 unsigned int size_as_int
6589 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6591 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6592 warning_with_decl (fndecl,
6593 "size of return value of `%s' is %u bytes",
6596 warning_with_decl (fndecl,
6597 "size of return value of `%s' is larger than %d bytes",
6602 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6604 /* Stop pointing to the local nodes about to be freed.
6605 But DECL_INITIAL must remain nonzero so we know this
6606 was an actual function definition.
6607 For a nested function, this is done in pop_c_function_context.
6608 If rest_of_compilation set this to 0, leave it 0. */
6609 if (DECL_INITIAL (fndecl) != 0)
6610 DECL_INITIAL (fndecl) = error_mark_node;
6612 DECL_ARGUMENTS (fndecl) = 0;
6615 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6617 #ifndef ASM_OUTPUT_CONSTRUCTOR
6618 if (! flag_gnu_linker)
6619 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6622 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6625 if (DECL_STATIC_DESTRUCTOR (fndecl))
6627 #ifndef ASM_OUTPUT_DESTRUCTOR
6628 if (! flag_gnu_linker)
6629 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6632 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6637 /* Let the error reporting routines know that we're outside a
6638 function. For a nested function, this value is used in
6639 pop_c_function_context and then reset via pop_function_context. */
6640 current_function_decl = NULL;
6644 /* Save and restore the variables in this file and elsewhere
6645 that keep track of the progress of compilation of the current function.
6646 Used for nested functions. */
6648 struct language_function
6651 tree shadowed_labels;
6654 int warn_about_return_type;
6656 struct binding_level *binding_level;
6659 /* Save and reinitialize the variables
6660 used during compilation of a C function. */
6663 push_c_function_context (f)
6666 struct language_function *p;
6667 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6670 p->named_labels = named_labels;
6671 p->shadowed_labels = shadowed_labels;
6672 p->returns_value = current_function_returns_value;
6673 p->returns_null = current_function_returns_null;
6674 p->warn_about_return_type = warn_about_return_type;
6675 p->extern_inline = current_extern_inline;
6676 p->binding_level = current_binding_level;
6679 /* Restore the variables used during compilation of a C function. */
6682 pop_c_function_context (f)
6685 struct language_function *p = f->language;
6688 /* Bring back all the labels that were shadowed. */
6689 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6690 if (DECL_NAME (TREE_VALUE (link)) != 0)
6691 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6692 = TREE_VALUE (link);
6694 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6696 /* Stop pointing to the local nodes about to be freed. */
6697 /* But DECL_INITIAL must remain nonzero so we know this
6698 was an actual function definition. */
6699 DECL_INITIAL (current_function_decl) = error_mark_node;
6700 DECL_ARGUMENTS (current_function_decl) = 0;
6703 named_labels = p->named_labels;
6704 shadowed_labels = p->shadowed_labels;
6705 current_function_returns_value = p->returns_value;
6706 current_function_returns_null = p->returns_null;
6707 warn_about_return_type = p->warn_about_return_type;
6708 current_extern_inline = p->extern_inline;
6709 current_binding_level = p->binding_level;
6715 /* Mark the language specific parts of F for GC. */
6717 mark_c_function_context (f)
6720 struct language_function *p = f->language;
6725 ggc_mark_tree (p->shadowed_labels);
6726 ggc_mark_tree (p->named_labels);
6727 mark_binding_level (&p->binding_level);
6730 /* integrate_decl_tree calls this function, but since we don't use the
6731 DECL_LANG_SPECIFIC field, this is a no-op. */
6734 copy_lang_decl (node)
6735 tree node ATTRIBUTE_UNUSED;
6739 /* Mark ARG for GC. */
6741 lang_mark_false_label_stack (arg)
6742 struct label_node *arg;
6744 /* C doesn't use false_label_stack. It better be NULL. */
6749 /* Mark the language specific bits in T for GC. */
6754 if (TREE_CODE (t) == IDENTIFIER_NODE)
6756 struct lang_identifier *i = (struct lang_identifier *) t;
6757 ggc_mark_tree (i->global_value);
6758 ggc_mark_tree (i->local_value);
6759 ggc_mark_tree (i->label_value);
6760 ggc_mark_tree (i->implicit_decl);
6761 ggc_mark_tree (i->error_locus);
6762 ggc_mark_tree (i->limbo_value);
6764 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6765 ggc_mark (TYPE_LANG_SPECIFIC (t));