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 && !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 && !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 builtin_function ("__builtin_aggregate_incoming_address",
3038 build_function_type (ptr_type_node, NULL_TREE),
3039 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3040 BUILT_IN_NORMAL, NULL_PTR);
3042 /* Hooks for the DWARF 2 __throw routine. */
3043 builtin_function ("__builtin_unwind_init",
3044 build_function_type (void_type_node, endlink),
3045 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3046 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3047 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3048 builtin_function ("__builtin_dwarf_fp_regnum",
3049 build_function_type (unsigned_type_node, endlink),
3050 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3051 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3052 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3053 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3054 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3055 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3056 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3058 ("__builtin_eh_return",
3059 build_function_type (void_type_node,
3060 tree_cons (NULL_TREE, ptr_type_node,
3061 tree_cons (NULL_TREE,
3062 type_for_mode (ptr_mode, 0),
3063 tree_cons (NULL_TREE,
3066 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3068 pedantic_lvalues = pedantic;
3070 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3071 make_fname_decl = c_make_fname_decl;
3072 declare_function_name ();
3074 start_identifier_warnings ();
3076 /* Prepare to check format strings against argument lists. */
3077 init_function_format_info ();
3081 incomplete_decl_finalize_hook = finish_incomplete_decl;
3083 lang_get_alias_set = c_get_alias_set;
3085 /* Record our roots. */
3087 ggc_add_tree_root (c_global_trees, CTI_MAX);
3088 ggc_add_tree_root (&named_labels, 1);
3089 ggc_add_tree_root (&shadowed_labels, 1);
3090 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3091 mark_binding_level);
3092 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3093 mark_binding_level);
3094 ggc_add_tree_root (&static_ctors, 1);
3095 ggc_add_tree_root (&static_dtors, 1);
3098 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3099 decl, NAME is the initialization string and TYPE_DEP indicates whether
3100 NAME depended on the type of the function. As we don't yet implement
3101 delayed emission of static data, we mark the decl as emitted
3102 so it is not placed in the output. Anything using it must therefore pull
3103 out the STRING_CST initializer directly. This does mean that these names
3104 are string merging candidates, which C99 does not permit. */
3107 c_make_fname_decl (id, name, type_dep)
3110 int type_dep ATTRIBUTE_UNUSED;
3112 tree decl, type, init;
3113 size_t length = strlen (name);
3115 type = build_array_type
3116 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3117 build_index_type (build_int_2 (length, 0)));
3119 decl = build_decl (VAR_DECL, id, type);
3120 TREE_STATIC (decl) = 1;
3121 TREE_READONLY (decl) = 1;
3122 TREE_ASM_WRITTEN (decl) = 1;
3123 DECL_SOURCE_LINE (decl) = 0;
3124 DECL_ARTIFICIAL (decl) = 1;
3125 DECL_IN_SYSTEM_HEADER (decl) = 1;
3126 DECL_IGNORED_P (decl) = 1;
3127 init = build_string (length + 1, name);
3128 TREE_TYPE (init) = type;
3129 DECL_INITIAL (decl) = init;
3130 finish_decl (pushdecl (decl), init, NULL_TREE);
3135 /* Return a definition for a builtin function named NAME and whose data type
3136 is TYPE. TYPE should be a function type with argument types.
3137 FUNCTION_CODE tells later passes how to compile calls to this function.
3138 See tree.h for its possible values.
3140 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3141 the name to be called if we can't opencode the function. */
3144 builtin_function (name, type, function_code, class, library_name)
3148 enum built_in_class class;
3149 const char *library_name;
3151 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3152 DECL_EXTERNAL (decl) = 1;
3153 TREE_PUBLIC (decl) = 1;
3154 /* If -traditional, permit redefining a builtin function any way you like.
3155 (Though really, if the program redefines these functions,
3156 it probably won't work right unless compiled with -fno-builtin.) */
3157 if (flag_traditional && name[0] != '_')
3158 DECL_BUILT_IN_NONANSI (decl) = 1;
3160 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3161 make_decl_rtl (decl, NULL_PTR, 1);
3163 DECL_BUILT_IN_CLASS (decl) = class;
3164 DECL_FUNCTION_CODE (decl) = function_code;
3166 /* Warn if a function in the namespace for users
3167 is used without an occasion to consider it declared. */
3168 if (name[0] != '_' || name[1] != '_')
3169 C_DECL_ANTICIPATED (decl) = 1;
3174 /* Called when a declaration is seen that contains no names to declare.
3175 If its type is a reference to a structure, union or enum inherited
3176 from a containing scope, shadow that tag name for the current scope
3177 with a forward reference.
3178 If its type defines a new named structure or union
3179 or defines an enum, it is valid but we need not do anything here.
3180 Otherwise, it is an error. */
3183 shadow_tag (declspecs)
3186 shadow_tag_warned (declspecs, 0);
3190 shadow_tag_warned (declspecs, warned)
3193 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3200 pending_invalid_xref = 0;
3202 /* Remove the attributes from declspecs, since they will confuse the
3204 split_specs_attrs (declspecs, &specs, &attrs);
3206 for (link = specs; link; link = TREE_CHAIN (link))
3208 register tree value = TREE_VALUE (link);
3209 register enum tree_code code = TREE_CODE (value);
3211 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3212 /* Used to test also that TYPE_SIZE (value) != 0.
3213 That caused warning for `struct foo;' at top level in the file. */
3215 register tree name = lookup_tag_reverse (value);
3222 if (warned != 1 && code != ENUMERAL_TYPE)
3223 /* Empty unnamed enum OK */
3225 pedwarn ("unnamed struct/union that defines no instances");
3231 t = lookup_tag (code, name, current_binding_level, 1);
3235 t = make_node (code);
3242 if (!warned && ! in_system_header)
3244 warning ("useless keyword or type name in empty declaration");
3251 error ("two types specified in one empty declaration");
3256 pedwarn ("empty declaration");
3260 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3263 groktypename (typename)
3266 if (TREE_CODE (typename) != TREE_LIST)
3268 return grokdeclarator (TREE_VALUE (typename),
3269 TREE_PURPOSE (typename),
3273 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3276 groktypename_in_parm_context (typename)
3279 if (TREE_CODE (typename) != TREE_LIST)
3281 return grokdeclarator (TREE_VALUE (typename),
3282 TREE_PURPOSE (typename),
3286 /* Decode a declarator in an ordinary declaration or data definition.
3287 This is called as soon as the type information and variable name
3288 have been parsed, before parsing the initializer if any.
3289 Here we create the ..._DECL node, fill in its type,
3290 and put it on the list of decls for the current context.
3291 The ..._DECL node is returned as the value.
3293 Exception: for arrays where the length is not specified,
3294 the type is left null, to be filled in by `finish_decl'.
3296 Function definitions do not come here; they go to start_function
3297 instead. However, external and forward declarations of functions
3298 do go through here. Structure field declarations are done by
3299 grokfield and not through here. */
3302 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3303 tree declarator, declspecs;
3305 tree attributes, prefix_attributes;
3307 register tree decl = grokdeclarator (declarator, declspecs,
3308 NORMAL, initialized);
3311 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3312 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3313 warning_with_decl (decl, "`%s' is usually a function");
3316 /* Is it valid for this decl to have an initializer at all?
3317 If not, set INITIALIZED to zero, which will indirectly
3318 tell `finish_decl' to ignore the initializer once it is parsed. */
3319 switch (TREE_CODE (decl))
3322 /* typedef foo = bar means give foo the same type as bar.
3323 We haven't parsed bar yet, so `finish_decl' will fix that up.
3324 Any other case of an initialization in a TYPE_DECL is an error. */
3325 if (pedantic || list_length (declspecs) > 1)
3327 error ("typedef `%s' is initialized",
3328 IDENTIFIER_POINTER (DECL_NAME (decl)));
3334 error ("function `%s' is initialized like a variable",
3335 IDENTIFIER_POINTER (DECL_NAME (decl)));
3340 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3341 error ("parameter `%s' is initialized",
3342 IDENTIFIER_POINTER (DECL_NAME (decl)));
3347 /* Don't allow initializations for incomplete types
3348 except for arrays which might be completed by the initialization. */
3349 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3351 /* A complete type is ok if size is fixed. */
3353 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3354 || C_DECL_VARIABLE_SIZE (decl))
3356 error ("variable-sized object may not be initialized");
3360 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3362 error ("variable `%s' has initializer but incomplete type",
3363 IDENTIFIER_POINTER (DECL_NAME (decl)));
3366 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3368 error ("elements of array `%s' have incomplete type",
3369 IDENTIFIER_POINTER (DECL_NAME (decl)));
3376 #if 0 /* Seems redundant with grokdeclarator. */
3377 if (current_binding_level != global_binding_level
3378 && DECL_EXTERNAL (decl)
3379 && TREE_CODE (decl) != FUNCTION_DECL)
3380 warning ("declaration of `%s' has `extern' and is initialized",
3381 IDENTIFIER_POINTER (DECL_NAME (decl)));
3383 DECL_EXTERNAL (decl) = 0;
3384 if (current_binding_level == global_binding_level)
3385 TREE_STATIC (decl) = 1;
3387 /* Tell `pushdecl' this is an initialized decl
3388 even though we don't yet have the initializer expression.
3389 Also tell `finish_decl' it may store the real initializer. */
3390 DECL_INITIAL (decl) = error_mark_node;
3393 /* If this is a function declaration, write a record describing it to the
3394 prototypes file (if requested). */
3396 if (TREE_CODE (decl) == FUNCTION_DECL)
3397 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3399 /* ANSI specifies that a tentative definition which is not merged with
3400 a non-tentative definition behaves exactly like a definition with an
3401 initializer equal to zero. (Section 3.7.2)
3402 -fno-common gives strict ANSI behavior. Usually you don't want it.
3403 This matters only for variables with external linkage. */
3404 if (! flag_no_common || ! TREE_PUBLIC (decl))
3405 DECL_COMMON (decl) = 1;
3407 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3408 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3411 /* Set attributes here so if duplicate decl, will have proper attributes. */
3412 decl_attributes (decl, attributes, prefix_attributes);
3414 /* Add this decl to the current binding level.
3415 TEM may equal DECL or it may be a previous decl of the same name. */
3416 tem = pushdecl (decl);
3418 /* For a local variable, define the RTL now. */
3419 if (current_binding_level != global_binding_level
3420 /* But not if this is a duplicate decl
3421 and we preserved the rtl from the previous one
3422 (which may or may not happen). */
3423 && DECL_RTL (tem) == 0)
3425 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3427 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3428 && DECL_INITIAL (tem) != 0)
3435 /* Finish processing of a declaration;
3436 install its initial value.
3437 If the length of an array type is not known before,
3438 it must be determined now, from the initial value, or it is an error. */
3441 finish_decl (decl, init, asmspec_tree)
3445 register tree type = TREE_TYPE (decl);
3446 int was_incomplete = (DECL_SIZE (decl) == 0);
3449 /* If a name was specified, get the string. */
3451 asmspec = TREE_STRING_POINTER (asmspec_tree);
3453 /* If `start_decl' didn't like having an initialization, ignore it now. */
3455 if (init != 0 && DECL_INITIAL (decl) == 0)
3457 /* Don't crash if parm is initialized. */
3458 if (TREE_CODE (decl) == PARM_DECL)
3461 if (ITERATOR_P (decl))
3464 error_with_decl (decl, "iterator has no initial value");
3466 init = save_expr (init);
3471 if (TREE_CODE (decl) != TYPE_DECL)
3472 store_init_value (decl, init);
3475 /* typedef foo = bar; store the type of bar as the type of foo. */
3476 TREE_TYPE (decl) = TREE_TYPE (init);
3477 DECL_INITIAL (decl) = init = 0;
3481 /* Deduce size of array from initialization, if not already known */
3483 if (TREE_CODE (type) == ARRAY_TYPE
3484 && TYPE_DOMAIN (type) == 0
3485 && TREE_CODE (decl) != TYPE_DECL)
3488 = (TREE_STATIC (decl)
3489 /* Even if pedantic, an external linkage array
3490 may have incomplete type at first. */
3491 ? pedantic && !TREE_PUBLIC (decl)
3492 : !DECL_EXTERNAL (decl));
3494 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3496 /* Get the completed type made by complete_array_type. */
3497 type = TREE_TYPE (decl);
3500 error_with_decl (decl, "initializer fails to determine size of `%s'");
3505 error_with_decl (decl, "array size missing in `%s'");
3506 /* If a `static' var's size isn't known,
3507 make it extern as well as static, so it does not get
3509 If it is not `static', then do not mark extern;
3510 finish_incomplete_decl will give it a default size
3511 and it will get allocated. */
3512 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3513 DECL_EXTERNAL (decl) = 1;
3516 /* TYPE_MAX_VALUE is always one less than the number of elements
3517 in the array, because we start counting at zero. Therefore,
3518 warn only if the value is less than zero. */
3519 if (pedantic && TYPE_DOMAIN (type) != 0
3520 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3521 error_with_decl (decl, "zero or negative size array `%s'");
3523 layout_decl (decl, 0);
3526 if (TREE_CODE (decl) == VAR_DECL)
3528 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3529 layout_decl (decl, 0);
3531 if (DECL_SIZE (decl) == 0
3532 && (TREE_STATIC (decl)
3534 /* A static variable with an incomplete type
3535 is an error if it is initialized.
3536 Also if it is not file scope.
3537 Otherwise, let it through, but if it is not `extern'
3538 then it may cause an error message later. */
3539 /* A duplicate_decls call could have changed an extern
3540 declaration into a file scope one. This can be detected
3541 by TREE_ASM_WRITTEN being set. */
3542 (DECL_INITIAL (decl) != 0
3543 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3545 /* An automatic variable with an incomplete type
3547 !DECL_EXTERNAL (decl)))
3549 error_with_decl (decl, "storage size of `%s' isn't known");
3550 TREE_TYPE (decl) = error_mark_node;
3553 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3554 && DECL_SIZE (decl) != 0)
3556 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3557 constant_expression_warning (DECL_SIZE (decl));
3559 error_with_decl (decl, "storage size of `%s' isn't constant");
3562 if (TREE_USED (type))
3563 TREE_USED (decl) = 1;
3566 /* If this is a function and an assembler name is specified, it isn't
3567 builtin any more. Also reset DECL_RTL so we can give it its new
3569 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3571 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3572 DECL_RTL (decl) = 0;
3573 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3576 /* Output the assembler code and/or RTL code for variables and functions,
3577 unless the type is an undefined structure or union.
3578 If not, it will get done when the type is completed. */
3580 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3582 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3583 maybe_objc_check_decl (decl);
3584 rest_of_decl_compilation (decl, asmspec,
3585 (DECL_CONTEXT (decl) == 0
3586 || TREE_ASM_WRITTEN (decl)), 0);
3588 if (DECL_CONTEXT (decl) != 0)
3590 /* Recompute the RTL of a local array now
3591 if it used to be an incomplete type. */
3593 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3595 /* If we used it already as memory, it must stay in memory. */
3596 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3597 /* If it's still incomplete now, no init will save it. */
3598 if (DECL_SIZE (decl) == 0)
3599 DECL_INITIAL (decl) = 0;
3602 /* Compute and store the initial value. */
3603 if (TREE_CODE (decl) != FUNCTION_DECL)
3604 expand_decl_init (decl);
3608 if (TREE_CODE (decl) == TYPE_DECL)
3610 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3611 maybe_objc_check_decl (decl);
3612 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3615 /* At the end of a declaration, throw away any variable type sizes
3616 of types defined inside that declaration. There is no use
3617 computing them in the following function definition. */
3618 if (current_binding_level == global_binding_level)
3619 get_pending_sizes ();
3622 /* If DECL has a cleanup, build and return that cleanup here.
3623 This is a callback called by expand_expr. */
3626 maybe_build_cleanup (decl)
3627 tree decl ATTRIBUTE_UNUSED;
3629 /* There are no cleanups in C. */
3633 /* Given a parsed parameter declaration,
3634 decode it into a PARM_DECL and push that on the current binding level.
3635 Also, for the sake of forward parm decls,
3636 record the given order of parms in `parm_order'. */
3639 push_parm_decl (parm)
3643 int old_immediate_size_expand = immediate_size_expand;
3644 /* Don't try computing parm sizes now -- wait till fn is called. */
3645 immediate_size_expand = 0;
3647 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3648 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3649 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3650 TREE_PURPOSE (TREE_VALUE (parm)));
3653 if (DECL_NAME (decl))
3656 olddecl = lookup_name (DECL_NAME (decl));
3657 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3658 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3662 decl = pushdecl (decl);
3664 immediate_size_expand = old_immediate_size_expand;
3666 current_binding_level->parm_order
3667 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3669 /* Add this decl to the current binding level. */
3670 finish_decl (decl, NULL_TREE, NULL_TREE);
3673 /* Clear the given order of parms in `parm_order'.
3674 Used at start of parm list,
3675 and also at semicolon terminating forward decls. */
3680 current_binding_level->parm_order = NULL_TREE;
3683 /* Make TYPE a complete type based on INITIAL_VALUE.
3684 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3685 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3688 complete_array_type (type, initial_value, do_default)
3693 register tree maxindex = NULL_TREE;
3698 /* Note MAXINDEX is really the maximum index,
3699 one less than the size. */
3700 if (TREE_CODE (initial_value) == STRING_CST)
3703 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3704 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3707 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3709 tree elts = CONSTRUCTOR_ELTS (initial_value);
3710 maxindex = build_int_2 (-1, -1);
3711 for (; elts; elts = TREE_CHAIN (elts))
3713 if (TREE_PURPOSE (elts))
3714 maxindex = TREE_PURPOSE (elts);
3716 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3717 maxindex, integer_one_node));
3719 maxindex = copy_node (maxindex);
3723 /* Make an error message unless that happened already. */
3724 if (initial_value != error_mark_node)
3727 /* Prevent further error messages. */
3728 maxindex = build_int_2 (0, 0);
3735 maxindex = build_int_2 (0, 0);
3741 TYPE_DOMAIN (type) = build_index_type (maxindex);
3742 if (!TREE_TYPE (maxindex))
3743 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3746 /* Lay out the type now that we can get the real answer. */
3753 /* Given declspecs and a declarator,
3754 determine the name and type of the object declared
3755 and construct a ..._DECL node for it.
3756 (In one case we can return a ..._TYPE node instead.
3757 For invalid input we sometimes return 0.)
3759 DECLSPECS is a chain of tree_list nodes whose value fields
3760 are the storage classes and type specifiers.
3762 DECL_CONTEXT says which syntactic context this declaration is in:
3763 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3764 FUNCDEF for a function definition. Like NORMAL but a few different
3765 error messages in each case. Return value may be zero meaning
3766 this definition is too screwy to try to parse.
3767 PARM for a parameter declaration (either within a function prototype
3768 or before a function body). Make a PARM_DECL, or return void_type_node.
3769 TYPENAME if for a typename (in a cast or sizeof).
3770 Don't make a DECL node; just return the ..._TYPE node.
3771 FIELD for a struct or union field; make a FIELD_DECL.
3772 BITFIELD for a field with specified width.
3773 INITIALIZED is 1 if the decl has an initializer.
3775 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3776 It may also be so in the PARM case, for a prototype where the
3777 argument type is specified but not the name.
3779 This function is where the complicated C meanings of `static'
3780 and `extern' are interpreted. */
3783 grokdeclarator (declarator, declspecs, decl_context, initialized)
3786 enum decl_context decl_context;
3791 tree type = NULL_TREE;
3796 int type_quals = TYPE_UNQUALIFIED;
3798 int explicit_int = 0;
3799 int explicit_char = 0;
3800 int defaulted_int = 0;
3801 tree typedef_decl = 0;
3803 tree typedef_type = 0;
3804 int funcdef_flag = 0;
3805 enum tree_code innermost_code = ERROR_MARK;
3807 int size_varies = 0;
3808 tree decl_machine_attr = NULL_TREE;
3810 if (decl_context == BITFIELD)
3811 bitfield = 1, decl_context = FIELD;
3813 if (decl_context == FUNCDEF)
3814 funcdef_flag = 1, decl_context = NORMAL;
3816 /* Look inside a declarator for the name being declared
3817 and get it as a string, for an error message. */
3819 register tree decl = declarator;
3823 switch (TREE_CODE (decl))
3828 innermost_code = TREE_CODE (decl);
3829 decl = TREE_OPERAND (decl, 0);
3832 case IDENTIFIER_NODE:
3833 name = IDENTIFIER_POINTER (decl);
3844 /* A function definition's declarator must have the form of
3845 a function declarator. */
3847 if (funcdef_flag && innermost_code != CALL_EXPR)
3850 /* Anything declared one level down from the top level
3851 must be one of the parameters of a function
3852 (because the body is at least two levels down). */
3854 /* If this looks like a function definition, make it one,
3855 even if it occurs where parms are expected.
3856 Then store_parm_decls will reject it and not use it as a parm. */
3857 if (decl_context == NORMAL && !funcdef_flag
3858 && current_binding_level->parm_flag)
3859 decl_context = PARM;
3861 /* Look through the decl specs and record which ones appear.
3862 Some typespecs are defined as built-in typenames.
3863 Others, the ones that are modifiers of other types,
3864 are represented by bits in SPECBITS: set the bits for
3865 the modifiers that appear. Storage class keywords are also in SPECBITS.
3867 If there is a typedef name or a type, store the type in TYPE.
3868 This includes builtin typedefs such as `int'.
3870 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3871 and did not come from a user typedef.
3873 Set LONGLONG if `long' is mentioned twice. */
3875 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3878 register tree id = TREE_VALUE (spec);
3880 if (id == ridpointers[(int) RID_INT])
3882 if (id == ridpointers[(int) RID_CHAR])
3885 if (TREE_CODE (id) == IDENTIFIER_NODE)
3886 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3888 if (ridpointers[i] == id)
3890 if (i == (int) RID_LONG && specbits & (1<<i))
3893 error ("`long long long' is too long for GCC");
3896 if (pedantic && ! in_system_header && warn_long_long)
3897 pedwarn ("ANSI C does not support `long long'");
3901 else if (specbits & (1 << i))
3902 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3908 error ("two or more data types in declaration of `%s'", name);
3909 /* Actual typedefs come to us as TYPE_DECL nodes. */
3910 else if (TREE_CODE (id) == TYPE_DECL)
3912 type = TREE_TYPE (id);
3913 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3916 /* Built-in types come as identifiers. */
3917 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3919 register tree t = lookup_name (id);
3920 if (TREE_TYPE (t) == error_mark_node)
3922 else if (!t || TREE_CODE (t) != TYPE_DECL)
3923 error ("`%s' fails to be a typedef or built in type",
3924 IDENTIFIER_POINTER (id));
3927 type = TREE_TYPE (t);
3931 else if (TREE_CODE (id) != ERROR_MARK)
3937 typedef_type = type;
3939 size_varies = C_TYPE_VARIABLE_SIZE (type);
3941 /* No type at all: default to `int', and set DEFAULTED_INT
3942 because it was not a user-defined typedef. */
3946 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3947 | (1 << (int) RID_SIGNED)
3948 | (1 << (int) RID_UNSIGNED))))
3949 /* Don't warn about typedef foo = bar. */
3950 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3951 && ! in_system_header)
3953 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3954 and this is a function, or if -Wimplicit; prefer the former
3955 warning since it is more explicit. */
3956 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
3957 warn_about_return_type = 1;
3958 else if (warn_implicit_int || flag_isoc99)
3959 warning ("type defaults to `int' in declaration of `%s'", name);
3963 type = integer_type_node;
3966 /* Now process the modifiers that were specified
3967 and check for invalid combinations. */
3969 /* Long double is a special combination. */
3971 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3972 && TYPE_MAIN_VARIANT (type) == double_type_node)
3974 specbits &= ~ (1 << (int) RID_LONG);
3975 type = long_double_type_node;
3978 /* Check all other uses of type modifiers. */
3980 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3981 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3985 if ((specbits & 1 << (int) RID_LONG)
3986 && (specbits & 1 << (int) RID_SHORT))
3987 error ("both long and short specified for `%s'", name);
3988 else if (((specbits & 1 << (int) RID_LONG)
3989 || (specbits & 1 << (int) RID_SHORT))
3991 error ("long or short specified with char for `%s'", name);
3992 else if (((specbits & 1 << (int) RID_LONG)
3993 || (specbits & 1 << (int) RID_SHORT))
3994 && TREE_CODE (type) == REAL_TYPE)
3996 static int already = 0;
3998 error ("long or short specified with floating type for `%s'", name);
3999 if (! already && ! pedantic)
4001 error ("the only valid combination is `long double'");
4005 else if ((specbits & 1 << (int) RID_SIGNED)
4006 && (specbits & 1 << (int) RID_UNSIGNED))
4007 error ("both signed and unsigned specified for `%s'", name);
4008 else if (TREE_CODE (type) != INTEGER_TYPE)
4009 error ("long, short, signed or unsigned invalid for `%s'", name);
4013 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4015 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4017 if (flag_pedantic_errors)
4022 /* Discard the type modifiers if they are invalid. */
4025 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4026 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4031 if ((specbits & (1 << (int) RID_COMPLEX))
4032 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4034 error ("complex invalid for `%s'", name);
4035 specbits &= ~ (1 << (int) RID_COMPLEX);
4038 /* Decide whether an integer type is signed or not.
4039 Optionally treat bitfields as signed by default. */
4040 if (specbits & 1 << (int) RID_UNSIGNED
4041 /* Traditionally, all bitfields are unsigned. */
4042 || (bitfield && flag_traditional
4043 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4044 || (bitfield && ! flag_signed_bitfields
4045 && (explicit_int || defaulted_int || explicit_char
4046 /* A typedef for plain `int' without `signed'
4047 can be controlled just like plain `int'. */
4048 || ! (typedef_decl != 0
4049 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4050 && TREE_CODE (type) != ENUMERAL_TYPE
4051 && !(specbits & 1 << (int) RID_SIGNED)))
4054 type = long_long_unsigned_type_node;
4055 else if (specbits & 1 << (int) RID_LONG)
4056 type = long_unsigned_type_node;
4057 else if (specbits & 1 << (int) RID_SHORT)
4058 type = short_unsigned_type_node;
4059 else if (type == char_type_node)
4060 type = unsigned_char_type_node;
4061 else if (typedef_decl)
4062 type = unsigned_type (type);
4064 type = unsigned_type_node;
4066 else if ((specbits & 1 << (int) RID_SIGNED)
4067 && type == char_type_node)
4068 type = signed_char_type_node;
4070 type = long_long_integer_type_node;
4071 else if (specbits & 1 << (int) RID_LONG)
4072 type = long_integer_type_node;
4073 else if (specbits & 1 << (int) RID_SHORT)
4074 type = short_integer_type_node;
4076 if (specbits & 1 << (int) RID_COMPLEX)
4078 /* If we just have "complex", it is equivalent to
4079 "complex double", but if any modifiers at all are specified it is
4080 the complex form of TYPE. E.g, "complex short" is
4081 "complex short int". */
4083 if (defaulted_int && ! longlong
4084 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4085 | (1 << (int) RID_SIGNED)
4086 | (1 << (int) RID_UNSIGNED))))
4087 type = complex_double_type_node;
4088 else if (type == integer_type_node)
4089 type = complex_integer_type_node;
4090 else if (type == float_type_node)
4091 type = complex_float_type_node;
4092 else if (type == double_type_node)
4093 type = complex_double_type_node;
4094 else if (type == long_double_type_node)
4095 type = complex_long_double_type_node;
4097 type = build_complex_type (type);
4100 /* Figure out the type qualifiers for the declaration. There are
4101 two ways a declaration can become qualified. One is something
4102 like `const int i' where the `const' is explicit. Another is
4103 something like `typedef const int CI; CI i' where the type of the
4104 declaration contains the `const'. */
4105 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4106 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4107 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4108 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4110 pedwarn ("duplicate `const'");
4112 pedwarn ("duplicate `restrict'");
4114 pedwarn ("duplicate `volatile'");
4115 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4116 type = TYPE_MAIN_VARIANT (type);
4117 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4118 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4119 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4121 /* Warn if two storage classes are given. Default to `auto'. */
4126 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4127 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4128 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4129 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4130 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4131 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4133 /* Warn about storage classes that are invalid for certain
4134 kinds of declarations (parameters, typenames, etc.). */
4137 error ("multiple storage classes in declaration of `%s'", name);
4138 else if (funcdef_flag
4140 & ((1 << (int) RID_REGISTER)
4141 | (1 << (int) RID_AUTO)
4142 | (1 << (int) RID_TYPEDEF))))
4144 if (specbits & 1 << (int) RID_AUTO
4145 && (pedantic || current_binding_level == global_binding_level))
4146 pedwarn ("function definition declared `auto'");
4147 if (specbits & 1 << (int) RID_REGISTER)
4148 error ("function definition declared `register'");
4149 if (specbits & 1 << (int) RID_TYPEDEF)
4150 error ("function definition declared `typedef'");
4151 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4152 | (1 << (int) RID_AUTO));
4154 else if (decl_context != NORMAL && nclasses > 0)
4156 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4160 switch (decl_context)
4163 error ("storage class specified for structure field `%s'", name);
4166 error ("storage class specified for parameter `%s'", name);
4169 error ("storage class specified for typename");
4172 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4173 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4174 | (1 << (int) RID_EXTERN));
4177 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4179 /* `extern' with initialization is invalid if not at top level. */
4180 if (current_binding_level == global_binding_level)
4181 warning ("`%s' initialized and declared `extern'", name);
4183 error ("`%s' has both `extern' and initializer", name);
4185 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4186 && current_binding_level != global_binding_level)
4187 error ("nested function `%s' declared `extern'", name);
4188 else if (current_binding_level == global_binding_level
4189 && specbits & (1 << (int) RID_AUTO))
4190 error ("top-level declaration of `%s' specifies `auto'", name);
4191 else if ((specbits & 1 << (int) RID_ITERATOR)
4192 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4194 error ("iterator `%s' has derived type", name);
4195 type = error_mark_node;
4197 else if ((specbits & 1 << (int) RID_ITERATOR)
4198 && TREE_CODE (type) != INTEGER_TYPE)
4200 error ("iterator `%s' has noninteger type", name);
4201 type = error_mark_node;
4205 /* Now figure out the structure of the declarator proper.
4206 Descend through it, creating more complex types, until we reach
4207 the declared identifier (or NULL_TREE, in an absolute declarator). */
4209 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4211 if (type == error_mark_node)
4213 declarator = TREE_OPERAND (declarator, 0);
4217 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4218 an INDIRECT_REF (for *...),
4219 a CALL_EXPR (for ...(...)),
4220 an identifier (for the name being declared)
4221 or a null pointer (for the place in an absolute declarator
4222 where the name was omitted).
4223 For the last two cases, we have just exited the loop.
4225 At this point, TYPE is the type of elements of an array,
4226 or for a function to return, or for a pointer to point to.
4227 After this sequence of ifs, TYPE is the type of the
4228 array or function or pointer, and DECLARATOR has had its
4229 outermost layer removed. */
4231 if (TREE_CODE (declarator) == ARRAY_REF)
4233 register tree itype = NULL_TREE;
4234 register tree size = TREE_OPERAND (declarator, 1);
4235 /* The index is a signed object `sizetype' bits wide. */
4236 tree index_type = signed_type (sizetype);
4238 declarator = TREE_OPERAND (declarator, 0);
4240 /* Check for some types that there cannot be arrays of. */
4242 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4244 error ("declaration of `%s' as array of voids", name);
4245 type = error_mark_node;
4248 if (TREE_CODE (type) == FUNCTION_TYPE)
4250 error ("declaration of `%s' as array of functions", name);
4251 type = error_mark_node;
4254 if (size == error_mark_node)
4255 type = error_mark_node;
4257 if (type == error_mark_node)
4260 /* If size was specified, set ITYPE to a range-type for that size.
4261 Otherwise, ITYPE remains null. finish_decl may figure it out
4262 from an initial value. */
4266 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4267 STRIP_TYPE_NOPS (size);
4269 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4270 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4272 error ("size of array `%s' has non-integer type", name);
4273 size = integer_one_node;
4276 if (pedantic && integer_zerop (size))
4277 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4279 if (TREE_CODE (size) == INTEGER_CST)
4281 constant_expression_warning (size);
4282 if (tree_int_cst_sgn (size) < 0)
4284 error ("size of array `%s' is negative", name);
4285 size = integer_one_node;
4290 /* Make sure the array size remains visibly nonconstant
4291 even if it is (eg) a const variable with known value. */
4296 if (TREE_CONSTANT (size))
4297 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4299 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4303 /* Convert size to index_type, so that if it is a variable
4304 the computations will be done in the proper mode. */
4305 itype = fold (build (MINUS_EXPR, index_type,
4306 convert (index_type, size),
4307 convert (index_type, size_one_node)));
4309 /* If that overflowed, the array is too big.
4310 ??? While a size of INT_MAX+1 technically shouldn't cause
4311 an overflow (because we subtract 1), the overflow is recorded
4312 during the conversion to index_type, before the subtraction.
4313 Handling this case seems like an unnecessary complication. */
4314 if (TREE_OVERFLOW (itype))
4316 error ("size of array `%s' is too large", name);
4317 type = error_mark_node;
4322 itype = variable_size (itype);
4323 itype = build_index_type (itype);
4326 #if 0 /* This had bad results for pointers to arrays, as in
4327 union incomplete (*foo)[4]; */
4328 /* Complain about arrays of incomplete types, except in typedefs. */
4330 if (!COMPLETE_TYPE_P (type)
4331 /* Avoid multiple warnings for nested array types. */
4332 && TREE_CODE (type) != ARRAY_TYPE
4333 && !(specbits & (1 << (int) RID_TYPEDEF))
4334 && !C_TYPE_BEING_DEFINED (type))
4335 warning ("array type has incomplete element type");
4338 #if 0 /* We shouldn't have a function type here at all!
4339 Functions aren't allowed as array elements. */
4340 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4341 && (constp || volatilep))
4342 pedwarn ("ANSI C forbids const or volatile function types");
4345 /* Build the array type itself, then merge any constancy or
4346 volatility into the target type. We must do it in this order
4347 to ensure that the TYPE_MAIN_VARIANT field of the array type
4348 is set correctly. */
4350 type = build_array_type (type, itype);
4352 type = c_build_qualified_type (type, type_quals);
4354 #if 0 /* don't clear these; leave them set so that the array type
4355 or the variable is itself const or volatile. */
4356 type_quals = TYPE_UNQUALIFIED;
4360 C_TYPE_VARIABLE_SIZE (type) = 1;
4362 else if (TREE_CODE (declarator) == CALL_EXPR)
4366 /* Declaring a function type.
4367 Make sure we have a valid type for the function to return. */
4368 if (type == error_mark_node)
4373 /* Warn about some types functions can't return. */
4375 if (TREE_CODE (type) == FUNCTION_TYPE)
4377 error ("`%s' declared as function returning a function", name);
4378 type = integer_type_node;
4380 if (TREE_CODE (type) == ARRAY_TYPE)
4382 error ("`%s' declared as function returning an array", name);
4383 type = integer_type_node;
4386 #ifndef TRADITIONAL_RETURN_FLOAT
4387 /* Traditionally, declaring return type float means double. */
4389 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4390 type = double_type_node;
4391 #endif /* TRADITIONAL_RETURN_FLOAT */
4393 /* Construct the function type and go to the next
4394 inner layer of declarator. */
4396 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4398 /* Say it's a definition
4399 only for the CALL_EXPR
4400 closest to the identifier. */
4401 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4402 /* Type qualifiers before the return type of the function
4403 qualify the return type, not the function type. */
4405 type = c_build_qualified_type (type, type_quals);
4406 type_quals = TYPE_UNQUALIFIED;
4408 type = build_function_type (type, arg_types);
4409 declarator = TREE_OPERAND (declarator, 0);
4411 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4412 the formal parameter list of this FUNCTION_TYPE to point to
4413 the FUNCTION_TYPE node itself. */
4418 for (link = last_function_parm_tags;
4420 link = TREE_CHAIN (link))
4421 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4424 else if (TREE_CODE (declarator) == INDIRECT_REF)
4426 /* Merge any constancy or volatility into the target type
4429 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4431 pedwarn ("ANSI C forbids qualified function types");
4433 type = c_build_qualified_type (type, type_quals);
4434 type_quals = TYPE_UNQUALIFIED;
4437 type = build_pointer_type (type);
4439 /* Process a list of type modifier keywords
4440 (such as const or volatile) that were given inside the `*'. */
4442 if (TREE_TYPE (declarator))
4444 register tree typemodlist;
4450 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4451 typemodlist = TREE_CHAIN (typemodlist))
4453 tree qualifier = TREE_VALUE (typemodlist);
4455 if (qualifier == ridpointers[(int) RID_CONST])
4457 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4459 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4464 error ("invalid type modifier within pointer declarator");
4468 pedwarn ("duplicate `const'");
4470 pedwarn ("duplicate `volatile'");
4472 pedwarn ("duplicate `restrict'");
4474 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4475 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4476 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4479 declarator = TREE_OPERAND (declarator, 0);
4486 /* Now TYPE has the actual type. */
4488 /* Did array size calculations overflow? */
4490 if (TREE_CODE (type) == ARRAY_TYPE
4491 && COMPLETE_TYPE_P (type)
4492 && TREE_OVERFLOW (TYPE_SIZE (type)))
4493 error ("size of array `%s' is too large", name);
4495 /* If this is declaring a typedef name, return a TYPE_DECL. */
4497 if (specbits & (1 << (int) RID_TYPEDEF))
4500 /* Note that the grammar rejects storage classes
4501 in typenames, fields or parameters */
4502 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4504 pedwarn ("ANSI C forbids qualified function types");
4506 type = c_build_qualified_type (type, type_quals);
4507 decl = build_decl (TYPE_DECL, declarator, type);
4508 if ((specbits & (1 << (int) RID_SIGNED))
4509 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4510 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4514 /* Detect the case of an array type of unspecified size
4515 which came, as such, direct from a typedef name.
4516 We must copy the type, so that each identifier gets
4517 a distinct type, so that each identifier's size can be
4518 controlled separately by its own initializer. */
4520 if (type != 0 && typedef_type != 0
4521 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4522 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4524 type = build_array_type (TREE_TYPE (type), 0);
4526 C_TYPE_VARIABLE_SIZE (type) = 1;
4529 /* If this is a type name (such as, in a cast or sizeof),
4530 compute the type and return it now. */
4532 if (decl_context == TYPENAME)
4534 /* Note that the grammar rejects storage classes
4535 in typenames, fields or parameters */
4536 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4538 pedwarn ("ANSI C forbids const or volatile function types");
4540 type = c_build_qualified_type (type, type_quals);
4544 /* Aside from typedefs and type names (handle above),
4545 `void' at top level (not within pointer)
4546 is allowed only in public variables.
4547 We don't complain about parms either, but that is because
4548 a better error message can be made later. */
4550 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4551 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4552 && ((specbits & (1 << (int) RID_EXTERN))
4553 || (current_binding_level == global_binding_level
4555 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4557 error ("variable or field `%s' declared void", name);
4558 type = integer_type_node;
4561 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4562 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4567 if (decl_context == PARM)
4569 tree type_as_written = type;
4572 /* A parameter declared as an array of T is really a pointer to T.
4573 One declared as a function is really a pointer to a function. */
4575 if (TREE_CODE (type) == ARRAY_TYPE)
4577 /* Transfer const-ness of array into that of type pointed to. */
4578 type = TREE_TYPE (type);
4580 type = c_build_qualified_type (type, type_quals);
4581 type = build_pointer_type (type);
4582 type_quals = TYPE_UNQUALIFIED;
4585 else if (TREE_CODE (type) == FUNCTION_TYPE)
4587 if (pedantic && type_quals)
4588 pedwarn ("ANSI C forbids qualified function types");
4590 type = c_build_qualified_type (type, type_quals);
4591 type = build_pointer_type (type);
4592 type_quals = TYPE_UNQUALIFIED;
4595 decl = build_decl (PARM_DECL, declarator, type);
4597 C_DECL_VARIABLE_SIZE (decl) = 1;
4599 /* Compute the type actually passed in the parmlist,
4600 for the case where there is no prototype.
4601 (For example, shorts and chars are passed as ints.)
4602 When there is a prototype, this is overridden later. */
4604 if (type == error_mark_node)
4605 promoted_type = type;
4608 promoted_type = simple_type_promotes_to (type);
4609 if (! promoted_type)
4610 promoted_type = type;
4613 DECL_ARG_TYPE (decl) = promoted_type;
4614 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4616 else if (decl_context == FIELD)
4618 /* Structure field. It may not be a function. */
4620 if (TREE_CODE (type) == FUNCTION_TYPE)
4622 error ("field `%s' declared as a function", name);
4623 type = build_pointer_type (type);
4625 else if (TREE_CODE (type) != ERROR_MARK
4626 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4628 error ("field `%s' has incomplete type", name);
4629 type = error_mark_node;
4631 /* Move type qualifiers down to element of an array. */
4632 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4634 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4636 TYPE_DOMAIN (type));
4637 #if 0 /* Leave the field const or volatile as well. */
4638 type_quals = TYPE_UNQUALIFIED;
4641 decl = build_decl (FIELD_DECL, declarator, type);
4643 C_DECL_VARIABLE_SIZE (decl) = 1;
4645 else if (TREE_CODE (type) == FUNCTION_TYPE)
4647 /* Every function declaration is "external"
4648 except for those which are inside a function body
4649 in which `auto' is used.
4650 That is a case not specified by ANSI C,
4651 and we use it for forward declarations for nested functions. */
4652 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4653 || current_binding_level == global_binding_level);
4655 if (specbits & (1 << (int) RID_AUTO)
4656 && (pedantic || current_binding_level == global_binding_level))
4657 pedwarn ("invalid storage class for function `%s'", name);
4658 if (specbits & (1 << (int) RID_REGISTER))
4659 error ("invalid storage class for function `%s'", name);
4660 /* Function declaration not at top level.
4661 Storage classes other than `extern' are not allowed
4662 and `extern' makes no difference. */
4663 if (current_binding_level != global_binding_level
4664 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4666 pedwarn ("invalid storage class for function `%s'", name);
4668 decl = build_decl (FUNCTION_DECL, declarator, type);
4669 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4671 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4672 pedwarn ("ANSI C forbids qualified function types");
4675 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4676 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4677 && ! DECL_IN_SYSTEM_HEADER (decl))
4678 pedwarn ("ANSI C forbids qualified void function return type");
4680 /* GNU C interprets a `volatile void' return type to indicate
4681 that the function does not return. */
4682 if ((type_quals & TYPE_QUAL_VOLATILE)
4683 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4684 warning ("`noreturn' function returns non-void value");
4687 DECL_EXTERNAL (decl) = 1;
4688 /* Record absence of global scope for `static' or `auto'. */
4690 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4692 /* Record presence of `inline', if it is reasonable. */
4695 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4696 warning ("cannot inline function `main'");
4698 /* Assume that otherwise the function can be inlined. */
4699 DECL_INLINE (decl) = 1;
4701 if (specbits & (1 << (int) RID_EXTERN))
4702 current_extern_inline = 1;
4707 /* It's a variable. */
4708 /* An uninitialized decl with `extern' is a reference. */
4709 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4711 /* Move type qualifiers down to element of an array. */
4712 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4714 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4716 TYPE_DOMAIN (type));
4717 #if 0 /* Leave the variable const or volatile as well. */
4718 type_quals = TYPE_UNQUALIFIED;
4722 decl = build_decl (VAR_DECL, declarator, type);
4724 C_DECL_VARIABLE_SIZE (decl) = 1;
4727 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4729 DECL_EXTERNAL (decl) = extern_ref;
4730 /* At top level, the presence of a `static' or `register' storage
4731 class specifier, or the absence of all storage class specifiers
4732 makes this declaration a definition (perhaps tentative). Also,
4733 the absence of both `static' and `register' makes it public. */
4734 if (current_binding_level == global_binding_level)
4738 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4739 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4741 /* Not at top level, only `static' makes a static definition. */
4744 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4745 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4748 if (specbits & 1 << (int) RID_ITERATOR)
4749 ITERATOR_P (decl) = 1;
4752 /* Record `register' declaration for warnings on &
4753 and in case doing stupid register allocation. */
4755 if (specbits & (1 << (int) RID_REGISTER))
4756 DECL_REGISTER (decl) = 1;
4758 /* Record constancy and volatility. */
4759 c_apply_type_quals_to_decl (type_quals, decl);
4761 /* If a type has volatile components, it should be stored in memory.
4762 Otherwise, the fact that those components are volatile
4763 will be ignored, and would even crash the compiler. */
4764 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4765 mark_addressable (decl);
4771 /* Decode the parameter-list info for a function type or function definition.
4772 The argument is the value returned by `get_parm_info' (or made in parse.y
4773 if there is an identifier list instead of a parameter decl list).
4774 These two functions are separate because when a function returns
4775 or receives functions then each is called multiple times but the order
4776 of calls is different. The last call to `grokparms' is always the one
4777 that contains the formal parameter names of a function definition.
4779 Store in `last_function_parms' a chain of the decls of parms.
4780 Also store in `last_function_parm_tags' a chain of the struct, union,
4781 and enum tags declared among the parms.
4783 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4785 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4786 a mere declaration. A nonempty identifier-list gets an error message
4787 when FUNCDEF_FLAG is zero. */
4790 grokparms (parms_info, funcdef_flag)
4794 tree first_parm = TREE_CHAIN (parms_info);
4796 last_function_parms = TREE_PURPOSE (parms_info);
4797 last_function_parm_tags = TREE_VALUE (parms_info);
4799 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4800 && !in_system_header)
4801 warning ("function declaration isn't a prototype");
4804 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4807 pedwarn ("parameter names (without types) in function declaration");
4809 last_function_parms = first_parm;
4816 /* We no longer test FUNCDEF_FLAG.
4817 If the arg types are incomplete in a declaration,
4818 they must include undefined tags.
4819 These tags can never be defined in the scope of the declaration,
4820 so the types can never be completed,
4821 and no call can be compiled successfully. */
4823 /* In a fcn definition, arg types must be complete. */
4826 for (parm = last_function_parms, typelt = first_parm;
4828 parm = TREE_CHAIN (parm))
4829 /* Skip over any enumeration constants declared here. */
4830 if (TREE_CODE (parm) == PARM_DECL)
4832 /* Barf if the parameter itself has an incomplete type. */
4833 tree type = TREE_VALUE (typelt);
4834 if (!COMPLETE_TYPE_P (type))
4836 if (funcdef_flag && DECL_NAME (parm) != 0)
4837 error ("parameter `%s' has incomplete type",
4838 IDENTIFIER_POINTER (DECL_NAME (parm)));
4840 warning ("parameter has incomplete type");
4843 TREE_VALUE (typelt) = error_mark_node;
4844 TREE_TYPE (parm) = error_mark_node;
4847 #if 0 /* This has been replaced by parm_tags_warning
4848 which uses a more accurate criterion for what to warn about. */
4851 /* Now warn if is a pointer to an incomplete type. */
4852 while (TREE_CODE (type) == POINTER_TYPE
4853 || TREE_CODE (type) == REFERENCE_TYPE)
4854 type = TREE_TYPE (type);
4855 type = TYPE_MAIN_VARIANT (type);
4856 if (!COMPLETE_TYPE_P (type))
4858 if (DECL_NAME (parm) != 0)
4859 warning ("parameter `%s' points to incomplete type",
4860 IDENTIFIER_POINTER (DECL_NAME (parm)));
4862 warning ("parameter points to incomplete type");
4866 typelt = TREE_CHAIN (typelt);
4874 /* Return a tree_list node with info on a parameter list just parsed.
4875 The TREE_PURPOSE is a chain of decls of those parms.
4876 The TREE_VALUE is a list of structure, union and enum tags defined.
4877 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4878 This tree_list node is later fed to `grokparms'.
4880 VOID_AT_END nonzero means append `void' to the end of the type-list.
4881 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4884 get_parm_info (void_at_end)
4887 register tree decl, t;
4888 register tree types = 0;
4890 tree tags = gettags ();
4891 tree parms = getdecls ();
4893 tree order = current_binding_level->parm_order;
4895 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4896 if (void_at_end && parms != 0
4897 && TREE_CHAIN (parms) == 0
4898 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4899 && DECL_NAME (parms) == 0)
4902 storedecls (NULL_TREE);
4903 return tree_cons (NULL_TREE, NULL_TREE,
4904 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4907 /* Extract enumerator values and other non-parms declared with the parms.
4908 Likewise any forward parm decls that didn't have real parm decls. */
4909 for (decl = parms; decl; )
4911 tree next = TREE_CHAIN (decl);
4913 if (TREE_CODE (decl) != PARM_DECL)
4915 TREE_CHAIN (decl) = new_parms;
4918 else if (TREE_ASM_WRITTEN (decl))
4920 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4921 TREE_CHAIN (decl) = new_parms;
4927 /* Put the parm decls back in the order they were in in the parm list. */
4928 for (t = order; t; t = TREE_CHAIN (t))
4931 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4933 TREE_CHAIN (TREE_VALUE (t)) = 0;
4936 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4939 /* Store the parmlist in the binding level since the old one
4940 is no longer a valid list. (We have changed the chain pointers.) */
4941 storedecls (new_parms);
4943 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4944 /* There may also be declarations for enumerators if an enumeration
4945 type is declared among the parms. Ignore them here. */
4946 if (TREE_CODE (decl) == PARM_DECL)
4948 /* Since there is a prototype,
4949 args are passed in their declared types. */
4950 tree type = TREE_TYPE (decl);
4951 DECL_ARG_TYPE (decl) = type;
4952 if (PROMOTE_PROTOTYPES
4953 && (TREE_CODE (type) == INTEGER_TYPE
4954 || TREE_CODE (type) == ENUMERAL_TYPE)
4955 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4956 DECL_ARG_TYPE (decl) = integer_type_node;
4958 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4959 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4960 && DECL_NAME (decl) == 0)
4962 error ("`void' in parameter list must be the entire list");
4968 return tree_cons (new_parms, tags,
4969 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4971 return tree_cons (new_parms, tags, nreverse (types));
4974 /* At end of parameter list, warn about any struct, union or enum tags
4975 defined within. Do so because these types cannot ever become complete. */
4978 parmlist_tags_warning ()
4983 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4985 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4986 /* An anonymous union parm type is meaningful as a GNU extension.
4987 So don't warn for that. */
4988 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4990 if (TREE_PURPOSE (elt) != 0)
4991 warning ("`%s %s' declared inside parameter list",
4992 (code == RECORD_TYPE ? "struct"
4993 : code == UNION_TYPE ? "union"
4995 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4997 warning ("anonymous %s declared inside parameter list",
4998 (code == RECORD_TYPE ? "struct"
4999 : code == UNION_TYPE ? "union"
5004 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5010 /* Get the struct, enum or union (CODE says which) with tag NAME.
5011 Define the tag as a forward-reference if it is not defined. */
5014 xref_tag (code, name)
5015 enum tree_code code;
5018 /* If a cross reference is requested, look up the type
5019 already defined for this tag and return it. */
5021 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5022 /* Even if this is the wrong type of tag, return what we found.
5023 There will be an error message anyway, from pending_xref_error.
5024 If we create an empty xref just for an invalid use of the type,
5025 the main result is to create lots of superfluous error messages. */
5029 /* If no such tag is yet defined, create a forward-reference node
5030 and record it as the "definition".
5031 When a real declaration of this type is found,
5032 the forward-reference will be altered into a real type. */
5034 ref = make_node (code);
5035 if (code == ENUMERAL_TYPE)
5037 /* (In ANSI, Enums can be referred to only if already defined.) */
5039 pedwarn ("ANSI C forbids forward references to `enum' types");
5040 /* Give the type a default layout like unsigned int
5041 to avoid crashing if it does not get defined. */
5042 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5043 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5044 TREE_UNSIGNED (ref) = 1;
5045 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5046 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5047 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5050 pushtag (name, ref);
5055 /* Make sure that the tag NAME is defined *in the current binding level*
5056 at least as a forward reference.
5057 CODE says which kind of tag NAME ought to be. */
5060 start_struct (code, name)
5061 enum tree_code code;
5064 /* If there is already a tag defined at this binding level
5065 (as a forward reference), just return it. */
5067 register tree ref = 0;
5070 ref = lookup_tag (code, name, current_binding_level, 1);
5071 if (ref && TREE_CODE (ref) == code)
5073 C_TYPE_BEING_DEFINED (ref) = 1;
5074 TYPE_PACKED (ref) = flag_pack_struct;
5075 if (TYPE_FIELDS (ref))
5076 error ("redefinition of `%s %s'",
5077 code == UNION_TYPE ? "union" : "struct",
5078 IDENTIFIER_POINTER (name));
5083 /* Otherwise create a forward-reference just so the tag is in scope. */
5085 ref = make_node (code);
5086 pushtag (name, ref);
5087 C_TYPE_BEING_DEFINED (ref) = 1;
5088 TYPE_PACKED (ref) = flag_pack_struct;
5092 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5093 of a structure component, returning a FIELD_DECL node.
5094 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5096 This is done during the parsing of the struct declaration.
5097 The FIELD_DECL nodes are chained together and the lot of them
5098 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5101 grokfield (filename, line, declarator, declspecs, width)
5102 const char *filename ATTRIBUTE_UNUSED;
5103 int line ATTRIBUTE_UNUSED;
5104 tree declarator, declspecs, width;
5108 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5110 finish_decl (value, NULL_TREE, NULL_TREE);
5111 DECL_INITIAL (value) = width;
5113 maybe_objc_check_decl (value);
5117 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5118 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5119 ATTRIBUTES are attributes to be applied to the structure. */
5122 finish_struct (t, fieldlist, attributes)
5128 int toplevel = global_binding_level == current_binding_level;
5130 /* If this type was previously laid out as a forward reference,
5131 make sure we lay it out again. */
5135 decl_attributes (t, attributes, NULL_TREE);
5137 /* Nameless union parm types are useful as GCC extension. */
5138 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5139 /* Otherwise, warn about any struct or union def. in parmlist. */
5140 if (in_parm_level_p ())
5143 pedwarn ("%s defined inside parms",
5144 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5145 else if (! flag_traditional)
5146 warning ("%s defined inside parms",
5147 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5152 for (x = fieldlist; x; x = TREE_CHAIN (x))
5153 if (DECL_NAME (x) != 0)
5157 pedwarn ("%s has no %smembers",
5158 TREE_CODE (t) == UNION_TYPE ? "union" : "struct",
5159 fieldlist ? "named " : "");
5162 /* Install struct as DECL_CONTEXT of each field decl.
5163 Also process specified field sizes,m which is found in the DECL_INITIAL.
5164 Store 0 there, except for ": 0" fields (so we can find them
5165 and delete them, below). */
5167 for (x = fieldlist; x; x = TREE_CHAIN (x))
5169 DECL_CONTEXT (x) = t;
5170 DECL_PACKED (x) |= TYPE_PACKED (t);
5172 /* If any field is const, the structure type is pseudo-const. */
5173 if (TREE_READONLY (x))
5174 C_TYPE_FIELDS_READONLY (t) = 1;
5177 /* A field that is pseudo-const makes the structure likewise. */
5178 tree t1 = TREE_TYPE (x);
5179 while (TREE_CODE (t1) == ARRAY_TYPE)
5180 t1 = TREE_TYPE (t1);
5181 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5182 && C_TYPE_FIELDS_READONLY (t1))
5183 C_TYPE_FIELDS_READONLY (t) = 1;
5186 /* Any field that is volatile means variables of this type must be
5187 treated in some ways as volatile. */
5188 if (TREE_THIS_VOLATILE (x))
5189 C_TYPE_FIELDS_VOLATILE (t) = 1;
5191 /* Any field of nominal variable size implies structure is too. */
5192 if (C_DECL_VARIABLE_SIZE (x))
5193 C_TYPE_VARIABLE_SIZE (t) = 1;
5195 /* Detect invalid nested redefinition. */
5196 if (TREE_TYPE (x) == t)
5197 error ("nested redefinition of `%s'",
5198 IDENTIFIER_POINTER (TYPE_NAME (t)));
5200 /* Detect invalid bit-field size. */
5201 if (DECL_INITIAL (x))
5202 STRIP_NOPS (DECL_INITIAL (x));
5203 if (DECL_INITIAL (x))
5205 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5206 constant_expression_warning (DECL_INITIAL (x));
5210 "bit-field `%s' width not an integer constant");
5211 DECL_INITIAL (x) = NULL;
5215 /* Detect invalid bit-field type. */
5216 if (DECL_INITIAL (x)
5217 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5218 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5220 error_with_decl (x, "bit-field `%s' has invalid type");
5221 DECL_INITIAL (x) = NULL;
5224 if (DECL_INITIAL (x) && pedantic
5225 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5226 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5227 /* Accept an enum that's equivalent to int or unsigned int. */
5228 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5229 && (TYPE_PRECISION (TREE_TYPE (x))
5230 == TYPE_PRECISION (integer_type_node))))
5231 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5233 /* Detect and ignore out of range field width and process valid
5235 if (DECL_INITIAL (x))
5237 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5238 error_with_decl (x, "negative width in bit-field `%s'");
5239 else if (0 < compare_tree_int (DECL_INITIAL (x),
5240 TYPE_PRECISION (TREE_TYPE (x))))
5241 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5242 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5243 error_with_decl (x, "zero width for bit-field `%s'");
5246 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5247 unsigned HOST_WIDE_INT width
5248 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5250 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5251 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5252 TREE_UNSIGNED (TREE_TYPE (x)))
5254 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5255 TREE_UNSIGNED (TREE_TYPE (x))))))
5256 warning_with_decl (x,
5257 "`%s' is narrower than values of its type");
5259 DECL_SIZE (x) = bitsize_int (width);
5260 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5264 /* field size 0 => force desired amount of alignment. */
5265 #ifdef EMPTY_FIELD_BOUNDARY
5266 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5268 #ifdef PCC_BITFIELD_TYPE_MATTERS
5269 if (PCC_BITFIELD_TYPE_MATTERS)
5270 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5271 TYPE_ALIGN (TREE_TYPE (x)));
5277 else if (TREE_TYPE (x) != error_mark_node)
5279 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5280 : TYPE_ALIGN (TREE_TYPE (x)));
5282 /* Non-bit-fields are aligned for their type, except packed
5283 fields which require only BITS_PER_UNIT alignment. */
5284 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5287 DECL_INITIAL (x) = 0;
5290 /* Delete all duplicate fields from the fieldlist */
5291 for (x = fieldlist; x && TREE_CHAIN (x);)
5292 /* Anonymous fields aren't duplicates. */
5293 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5297 register tree y = fieldlist;
5301 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5307 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5309 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5310 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5312 else x = TREE_CHAIN (x);
5315 /* Now we have the nearly final fieldlist. Record it,
5316 then lay out the structure or union (including the fields). */
5318 TYPE_FIELDS (t) = fieldlist;
5322 /* Delete all zero-width bit-fields from the fieldlist */
5324 tree *fieldlistp = &fieldlist;
5326 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5327 *fieldlistp = TREE_CHAIN (*fieldlistp);
5329 fieldlistp = &TREE_CHAIN (*fieldlistp);
5332 /* Now we have the truly final field list.
5333 Store it in this type and in the variants. */
5335 TYPE_FIELDS (t) = fieldlist;
5337 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5339 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5340 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5341 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5344 /* If this was supposed to be a transparent union, but we can't
5345 make it one, warn and turn off the flag. */
5346 if (TREE_CODE (t) == UNION_TYPE
5347 && TYPE_TRANSPARENT_UNION (t)
5348 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5350 TYPE_TRANSPARENT_UNION (t) = 0;
5351 warning ("union cannot be made transparent");
5354 /* If this structure or union completes the type of any previous
5355 variable declaration, lay it out and output its rtl. */
5357 if (current_binding_level->n_incomplete != 0)
5360 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5362 if (TREE_TYPE (decl) == t
5363 && TREE_CODE (decl) != TYPE_DECL)
5365 layout_decl (decl, 0);
5366 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5367 maybe_objc_check_decl (decl);
5368 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5371 --current_binding_level->n_incomplete;
5373 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5374 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5376 tree element = TREE_TYPE (decl);
5377 while (TREE_CODE (element) == ARRAY_TYPE)
5378 element = TREE_TYPE (element);
5380 layout_array_type (TREE_TYPE (decl));
5385 /* Finish debugging output for this type. */
5386 rest_of_type_compilation (t, toplevel);
5391 /* Lay out the type T, and its element type, and so on. */
5394 layout_array_type (t)
5397 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5398 layout_array_type (TREE_TYPE (t));
5402 /* Begin compiling the definition of an enumeration type.
5403 NAME is its name (or null if anonymous).
5404 Returns the type object, as yet incomplete.
5405 Also records info about it so that build_enumerator
5406 may be used to declare the individual values as they are read. */
5412 register tree enumtype = 0;
5414 /* If this is the real definition for a previous forward reference,
5415 fill in the contents in the same object that used to be the
5416 forward reference. */
5419 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5421 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5423 enumtype = make_node (ENUMERAL_TYPE);
5424 pushtag (name, enumtype);
5427 C_TYPE_BEING_DEFINED (enumtype) = 1;
5429 if (TYPE_VALUES (enumtype) != 0)
5431 /* This enum is a named one that has been declared already. */
5432 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5434 /* Completely replace its old definition.
5435 The old enumerators remain defined, however. */
5436 TYPE_VALUES (enumtype) = 0;
5439 enum_next_value = integer_zero_node;
5442 if (flag_short_enums)
5443 TYPE_PACKED (enumtype) = 1;
5448 /* After processing and defining all the values of an enumeration type,
5449 install their decls in the enumeration type and finish it off.
5450 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5451 and ATTRIBUTES are the specified attributes.
5452 Returns ENUMTYPE. */
5455 finish_enum (enumtype, values, attributes)
5460 register tree pair, tem;
5461 tree minnode = 0, maxnode = 0;
5462 int precision, unsign;
5463 int toplevel = (global_binding_level == current_binding_level);
5465 if (in_parm_level_p ())
5466 warning ("enum defined inside parms");
5468 decl_attributes (enumtype, attributes, NULL_TREE);
5470 /* Calculate the maximum value of any enumerator in this type. */
5472 if (values == error_mark_node)
5473 minnode = maxnode = integer_zero_node;
5476 minnode = maxnode = TREE_VALUE (values);
5477 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5479 tree value = TREE_VALUE (pair);
5480 if (tree_int_cst_lt (maxnode, value))
5482 if (tree_int_cst_lt (value, minnode))
5487 /* Construct the final type of this enumeration. It is the same
5488 as one of the integral types - the narrowest one that fits, except
5489 that normally we only go as narrow as int - and signed iff any of
5490 the values are negative. */
5491 unsign = (tree_int_cst_sgn (minnode) >= 0);
5492 precision = MAX (min_precision (minnode, unsign),
5493 min_precision (maxnode, unsign));
5494 if (!TYPE_PACKED (enumtype))
5495 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5496 if (type_for_size (precision, unsign) == 0)
5498 warning ("enumeration values exceed range of largest integer");
5499 precision = TYPE_PRECISION (long_long_integer_type_node);
5502 TYPE_MIN_VALUE (enumtype) = minnode;
5503 TYPE_MAX_VALUE (enumtype) = maxnode;
5504 TYPE_PRECISION (enumtype) = precision;
5505 TREE_UNSIGNED (enumtype) = unsign;
5506 TYPE_SIZE (enumtype) = 0;
5507 layout_type (enumtype);
5509 if (values != error_mark_node)
5511 /* Change the type of the enumerators to be the enum type. We
5512 need to do this irrespective of the size of the enum, for
5513 proper type checking. Replace the DECL_INITIALs of the
5514 enumerators, and the value slots of the list, with copies
5515 that have the enum type; they cannot be modified in place
5516 because they may be shared (e.g. integer_zero_node) Finally,
5517 change the purpose slots to point to the names of the decls. */
5518 for (pair = values; pair; pair = TREE_CHAIN (pair))
5520 tree enu = TREE_PURPOSE (pair);
5522 TREE_TYPE (enu) = enumtype;
5523 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5524 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5525 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5526 DECL_MODE (enu) = TYPE_MODE (enumtype);
5527 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5529 TREE_PURPOSE (pair) = DECL_NAME (enu);
5530 TREE_VALUE (pair) = DECL_INITIAL (enu);
5533 TYPE_VALUES (enumtype) = values;
5536 /* Fix up all variant types of this enum type. */
5537 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5539 if (tem == enumtype)
5541 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5542 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5543 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5544 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5545 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5546 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5547 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5548 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5549 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5552 /* Finish debugging output for this type. */
5553 rest_of_type_compilation (enumtype, toplevel);
5558 /* Build and install a CONST_DECL for one value of the
5559 current enumeration type (one that was begun with start_enum).
5560 Return a tree-list containing the CONST_DECL and its value.
5561 Assignment of sequential values by default is handled here. */
5564 build_enumerator (name, value)
5567 register tree decl, type;
5569 /* Validate and default VALUE. */
5571 /* Remove no-op casts from the value. */
5573 STRIP_TYPE_NOPS (value);
5577 if (TREE_CODE (value) == INTEGER_CST)
5579 value = default_conversion (value);
5580 constant_expression_warning (value);
5584 error ("enumerator value for `%s' not integer constant",
5585 IDENTIFIER_POINTER (name));
5590 /* Default based on previous value. */
5591 /* It should no longer be possible to have NON_LVALUE_EXPR
5595 value = enum_next_value;
5597 error ("overflow in enumeration values");
5600 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5602 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5603 value = integer_zero_node;
5606 /* Set basis for default for next value. */
5607 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5608 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5610 /* Now create a declaration for the enum value name. */
5612 type = TREE_TYPE (value);
5613 type = type_for_size (MAX (TYPE_PRECISION (type),
5614 TYPE_PRECISION (integer_type_node)),
5616 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5617 && TREE_UNSIGNED (type)));
5619 decl = build_decl (CONST_DECL, name, type);
5620 DECL_INITIAL (decl) = value;
5621 TREE_TYPE (value) = type;
5624 return tree_cons (decl, value, NULL_TREE);
5627 /* Create the FUNCTION_DECL for a function definition.
5628 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5629 the declaration; they describe the function's name and the type it returns,
5630 but twisted together in a fashion that parallels the syntax of C.
5632 This function creates a binding context for the function body
5633 as well as setting up the FUNCTION_DECL in current_function_decl.
5635 Returns 1 on success. If the DECLARATOR is not suitable for a function
5636 (it defines a datum instead), we return 0, which tells
5637 yyparse to report a parse error. */
5640 start_function (declspecs, declarator, prefix_attributes, attributes)
5641 tree declarator, declspecs, prefix_attributes, attributes;
5643 tree decl1, old_decl;
5645 int old_immediate_size_expand = immediate_size_expand;
5647 current_function_returns_value = 0; /* Assume, until we see it does. */
5648 current_function_returns_null = 0;
5649 warn_about_return_type = 0;
5650 current_extern_inline = 0;
5651 c_function_varargs = 0;
5653 shadowed_labels = 0;
5655 /* Don't expand any sizes in the return type of the function. */
5656 immediate_size_expand = 0;
5658 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5660 /* If the declarator is not suitable for a function definition,
5661 cause a syntax error. */
5664 immediate_size_expand = old_immediate_size_expand;
5668 decl_attributes (decl1, prefix_attributes, attributes);
5670 announce_function (decl1);
5672 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5674 error ("return-type is an incomplete type");
5675 /* Make it return void instead. */
5677 = build_function_type (void_type_node,
5678 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5681 if (warn_about_return_type)
5682 warning ("return-type defaults to `int'");
5684 /* Save the parm names or decls from this function's declarator
5685 where store_parm_decls will find them. */
5686 current_function_parms = last_function_parms;
5687 current_function_parm_tags = last_function_parm_tags;
5689 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5690 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5691 DECL_INITIAL (decl1) = error_mark_node;
5693 /* If this definition isn't a prototype and we had a prototype declaration
5694 before, copy the arg type info from that prototype.
5695 But not if what we had before was a builtin function. */
5696 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5697 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5698 && !DECL_BUILT_IN (old_decl)
5699 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5700 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5701 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5703 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5704 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5705 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5708 /* If there is no explicit declaration, look for any out-of-scope implicit
5711 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5713 /* Optionally warn of old-fashioned def with no previous prototype. */
5714 if (warn_strict_prototypes
5715 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5716 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5717 warning ("function declaration isn't a prototype");
5718 /* Optionally warn of any global def with no previous prototype. */
5719 else if (warn_missing_prototypes
5720 && TREE_PUBLIC (decl1)
5721 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5722 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5723 warning_with_decl (decl1, "no previous prototype for `%s'");
5724 /* Optionally warn of any def with no previous prototype
5725 if the function has already been used. */
5726 else if (warn_missing_prototypes
5727 && old_decl != 0 && TREE_USED (old_decl)
5728 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5729 warning_with_decl (decl1,
5730 "`%s' was used with no prototype before its definition");
5731 /* Optionally warn of any global def with no previous declaration. */
5732 else if (warn_missing_declarations
5733 && TREE_PUBLIC (decl1)
5735 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5736 warning_with_decl (decl1, "no previous declaration for `%s'");
5737 /* Optionally warn of any def with no previous declaration
5738 if the function has already been used. */
5739 else if (warn_missing_declarations
5740 && old_decl != 0 && TREE_USED (old_decl)
5741 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5742 warning_with_decl (decl1,
5743 "`%s' was used with no declaration before its definition");
5745 /* This is a definition, not a reference.
5746 So normally clear DECL_EXTERNAL.
5747 However, `extern inline' acts like a declaration
5748 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5749 DECL_EXTERNAL (decl1) = current_extern_inline;
5751 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5752 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5755 /* This function exists in static storage.
5756 (This does not mean `static' in the C sense!) */
5757 TREE_STATIC (decl1) = 1;
5759 /* A nested function is not global. */
5760 if (current_function_decl != 0)
5761 TREE_PUBLIC (decl1) = 0;
5763 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5765 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5770 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5771 != integer_type_node)
5772 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5774 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5775 args = TREE_CHAIN (args))
5777 tree type = args ? TREE_VALUE (args) : 0;
5779 if (type == void_type_node)
5786 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5787 pedwarn_with_decl (decl1,
5788 "first argument of `%s' should be `int'");
5792 if (TREE_CODE (type) != POINTER_TYPE
5793 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5794 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5796 pedwarn_with_decl (decl1,
5797 "second argument of `%s' should be `char **'");
5801 if (TREE_CODE (type) != POINTER_TYPE
5802 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5803 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5805 pedwarn_with_decl (decl1,
5806 "third argument of `%s' should probably be `char **'");
5811 /* It is intentional that this message does not mention the third
5812 argument, which is warned for only pedantically, because it's
5813 blessed by mention in an appendix of the standard. */
5814 if (argct > 0 && (argct < 2 || argct > 3))
5815 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5817 if (argct == 3 && pedantic)
5818 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5820 if (! TREE_PUBLIC (decl1))
5821 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5824 /* Record the decl so that the function name is defined.
5825 If we already have a decl for this name, and it is a FUNCTION_DECL,
5826 use the old decl. */
5828 current_function_decl = pushdecl (decl1);
5831 declare_parm_level (1);
5832 current_binding_level->subblocks_tag_transparent = 1;
5834 make_function_rtl (current_function_decl);
5836 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5837 /* Promote the value to int before returning it. */
5838 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5840 /* It retains unsignedness if traditional
5841 or if not really getting wider. */
5842 if (TREE_UNSIGNED (restype)
5843 && (flag_traditional
5844 || (TYPE_PRECISION (restype)
5845 == TYPE_PRECISION (integer_type_node))))
5846 restype = unsigned_type_node;
5848 restype = integer_type_node;
5850 DECL_RESULT (current_function_decl)
5851 = build_decl (RESULT_DECL, NULL_TREE, restype);
5853 /* If this fcn was already referenced via a block-scope `extern' decl
5854 (or an implicit decl), propagate certain information about the usage. */
5855 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5856 TREE_ADDRESSABLE (current_function_decl) = 1;
5858 immediate_size_expand = old_immediate_size_expand;
5863 /* Record that this function is going to be a varargs function.
5864 This is called before store_parm_decls, which is too early
5865 to call mark_varargs directly. */
5870 c_function_varargs = 1;
5873 /* Store the parameter declarations into the current function declaration.
5874 This is called after parsing the parameter declarations, before
5875 digesting the body of the function.
5877 For an old-style definition, modify the function's type
5878 to specify at least the number of arguments. */
5883 register tree fndecl = current_function_decl;
5886 /* This is either a chain of PARM_DECLs (if a prototype was used)
5887 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5888 tree specparms = current_function_parms;
5890 /* This is a list of types declared among parms in a prototype. */
5891 tree parmtags = current_function_parm_tags;
5893 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5894 register tree parmdecls = getdecls ();
5896 /* This is a chain of any other decls that came in among the parm
5897 declarations. If a parm is declared with enum {foo, bar} x;
5898 then CONST_DECLs for foo and bar are put here. */
5901 /* Nonzero if this definition is written with a prototype. */
5904 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5906 /* This case is when the function was defined with an ANSI prototype.
5907 The parms already have decls, so we need not do anything here
5908 except record them as in effect
5909 and complain if any redundant old-style parm decls were written. */
5920 error_with_decl (fndecl,
5921 "parm types given both in parmlist and separately");
5922 /* Get rid of the erroneous decls; don't keep them on
5923 the list of parms, since they might not be PARM_DECLs. */
5924 for (decl = current_binding_level->names;
5925 decl; decl = TREE_CHAIN (decl))
5926 if (DECL_NAME (decl))
5927 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5928 for (link = current_binding_level->shadowed;
5929 link; link = TREE_CHAIN (link))
5930 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5931 current_binding_level->names = 0;
5932 current_binding_level->shadowed = 0;
5935 specparms = nreverse (specparms);
5936 for (parm = specparms; parm; parm = next)
5938 next = TREE_CHAIN (parm);
5939 if (TREE_CODE (parm) == PARM_DECL)
5941 if (DECL_NAME (parm) == 0)
5942 error_with_decl (parm, "parameter name omitted");
5943 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5944 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5947 error_with_decl (parm, "parameter `%s' declared void");
5948 /* Change the type to error_mark_node so this parameter
5949 will be ignored by assign_parms. */
5950 TREE_TYPE (parm) = error_mark_node;
5956 /* If we find an enum constant or a type tag,
5957 put it aside for the moment. */
5958 TREE_CHAIN (parm) = 0;
5959 others = chainon (others, parm);
5963 /* Get the decls in their original chain order
5964 and record in the function. */
5965 DECL_ARGUMENTS (fndecl) = getdecls ();
5968 /* If this function takes a variable number of arguments,
5969 add a phony parameter to the end of the parm list,
5970 to represent the position of the first unnamed argument. */
5971 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5974 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5975 /* Let's hope the address of the unnamed parm
5976 won't depend on its type. */
5977 TREE_TYPE (dummy) = integer_type_node;
5978 DECL_ARG_TYPE (dummy) = integer_type_node;
5979 DECL_ARGUMENTS (fndecl)
5980 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5984 /* Now pushdecl the enum constants. */
5985 for (parm = others; parm; parm = next)
5987 next = TREE_CHAIN (parm);
5988 if (DECL_NAME (parm) == 0)
5990 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5992 else if (TREE_CODE (parm) != PARM_DECL)
5996 storetags (chainon (parmtags, gettags ()));
6000 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6001 each with a parm name as the TREE_VALUE.
6003 PARMDECLS is a chain of declarations for parameters.
6004 Warning! It can also contain CONST_DECLs which are not parameters
6005 but are names of enumerators of any enum types
6006 declared among the parameters.
6008 First match each formal parameter name with its declaration.
6009 Associate decls with the names and store the decls
6010 into the TREE_PURPOSE slots. */
6012 /* We use DECL_WEAK as a flag to show which parameters have been
6013 seen already since it is not used on PARM_DECL or CONST_DECL. */
6014 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6015 DECL_WEAK (parm) = 0;
6017 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6019 register tree tail, found = NULL;
6021 if (TREE_VALUE (parm) == 0)
6023 error_with_decl (fndecl,
6024 "parameter name missing from parameter list");
6025 TREE_PURPOSE (parm) = 0;
6029 /* See if any of the parmdecls specifies this parm by name.
6030 Ignore any enumerator decls. */
6031 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6032 if (DECL_NAME (tail) == TREE_VALUE (parm)
6033 && TREE_CODE (tail) == PARM_DECL)
6039 /* If declaration already marked, we have a duplicate name.
6040 Complain, and don't use this decl twice. */
6041 if (found && DECL_WEAK (found))
6043 error_with_decl (found, "multiple parameters named `%s'");
6047 /* If the declaration says "void", complain and ignore it. */
6048 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6050 error_with_decl (found, "parameter `%s' declared void");
6051 TREE_TYPE (found) = integer_type_node;
6052 DECL_ARG_TYPE (found) = integer_type_node;
6053 layout_decl (found, 0);
6056 /* Traditionally, a parm declared float is actually a double. */
6057 if (found && flag_traditional
6058 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6060 TREE_TYPE (found) = double_type_node;
6061 DECL_ARG_TYPE (found) = double_type_node;
6062 layout_decl (found, 0);
6065 /* If no declaration found, default to int. */
6068 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6070 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6071 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6072 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6074 warning_with_decl (found, "type of `%s' defaults to `int'");
6078 TREE_PURPOSE (parm) = found;
6080 /* Mark this decl as "already found" */
6081 DECL_WEAK (found) = 1;
6084 /* Put anything which is on the parmdecls chain and which is
6085 not a PARM_DECL onto the list NONPARMS. (The types of
6086 non-parm things which might appear on the list include
6087 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6088 any actual PARM_DECLs not matched with any names. */
6091 for (parm = parmdecls; parm; )
6093 tree next = TREE_CHAIN (parm);
6094 TREE_CHAIN (parm) = 0;
6096 if (TREE_CODE (parm) != PARM_DECL)
6097 nonparms = chainon (nonparms, parm);
6100 /* Complain about args with incomplete types. */
6101 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6103 error_with_decl (parm, "parameter `%s' has incomplete type");
6104 TREE_TYPE (parm) = error_mark_node;
6107 if (! DECL_WEAK (parm))
6109 error_with_decl (parm,
6110 "declaration for parameter `%s' but no such parameter");
6111 /* Pretend the parameter was not missing.
6112 This gets us to a standard state and minimizes
6113 further error messages. */
6115 = chainon (specparms,
6116 tree_cons (parm, NULL_TREE, NULL_TREE));
6123 /* Chain the declarations together in the order of the list of names. */
6124 /* Store that chain in the function decl, replacing the list of names. */
6126 DECL_ARGUMENTS (fndecl) = 0;
6129 for (last = 0; parm; parm = TREE_CHAIN (parm))
6130 if (TREE_PURPOSE (parm))
6133 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6135 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6136 last = TREE_PURPOSE (parm);
6137 TREE_CHAIN (last) = 0;
6141 /* If there was a previous prototype,
6142 set the DECL_ARG_TYPE of each argument according to
6143 the type previously specified, and report any mismatches. */
6145 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6148 for (parm = DECL_ARGUMENTS (fndecl),
6149 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6150 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6151 != void_type_node));
6152 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6154 if (parm == 0 || type == 0
6155 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6157 error ("number of arguments doesn't match prototype");
6158 error_with_file_and_line (current_function_prototype_file,
6159 current_function_prototype_line,
6160 "prototype declaration");
6163 /* Type for passing arg must be consistent
6164 with that declared for the arg. */
6165 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6167 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6168 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6170 /* Adjust argument to match prototype. E.g. a previous
6171 `int foo(float);' prototype causes
6172 `int foo(x) float x; {...}' to be treated like
6173 `int foo(float x) {...}'. This is particularly
6174 useful for argument types like uid_t. */
6175 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6177 if (PROMOTE_PROTOTYPES
6178 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6179 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6180 && TYPE_PRECISION (TREE_TYPE (parm))
6181 < TYPE_PRECISION (integer_type_node))
6182 DECL_ARG_TYPE (parm) = integer_type_node;
6186 pedwarn ("promoted argument `%s' doesn't match prototype",
6187 IDENTIFIER_POINTER (DECL_NAME (parm)));
6188 warning_with_file_and_line
6189 (current_function_prototype_file,
6190 current_function_prototype_line,
6191 "prototype declaration");
6194 /* If -traditional, allow `int' argument to match
6195 `unsigned' prototype. */
6196 else if (! (flag_traditional
6197 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6198 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6200 error ("argument `%s' doesn't match prototype",
6201 IDENTIFIER_POINTER (DECL_NAME (parm)));
6202 error_with_file_and_line (current_function_prototype_file,
6203 current_function_prototype_line,
6204 "prototype declaration");
6208 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6211 /* Otherwise, create a prototype that would match. */
6215 tree actual = 0, last = 0, type;
6217 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6219 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6221 TREE_CHAIN (last) = type;
6226 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6228 TREE_CHAIN (last) = type;
6232 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6233 of the type of this function, but we need to avoid having this
6234 affect the types of other similarly-typed functions, so we must
6235 first force the generation of an identical (but separate) type
6236 node for the relevant function type. The new node we create
6237 will be a variant of the main variant of the original function
6240 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6242 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6245 /* Now store the final chain of decls for the arguments
6246 as the decl-chain of the current lexical scope.
6247 Put the enumerators in as well, at the front so that
6248 DECL_ARGUMENTS is not modified. */
6250 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6253 /* Make sure the binding level for the top of the function body
6254 gets a BLOCK if there are any in the function.
6255 Otherwise, the dbx output is wrong. */
6257 keep_next_if_subblocks = 1;
6259 /* ??? This might be an improvement,
6260 but needs to be thought about some more. */
6262 keep_next_level_flag = 1;
6265 /* Write a record describing this function definition to the prototypes
6266 file (if requested). */
6268 gen_aux_info_record (fndecl, 1, 0, prototype);
6270 /* Initialize the RTL code for the function. */
6272 init_function_start (fndecl, input_filename, lineno);
6274 /* If this is a varargs function, inform function.c. */
6276 if (c_function_varargs)
6279 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6281 declare_function_name ();
6283 /* Set up parameters and prepare for return, for the function. */
6285 expand_function_start (fndecl, 0);
6287 /* If this function is `main', emit a call to `__main'
6288 to run global initializers, etc. */
6289 if (DECL_NAME (fndecl)
6290 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6291 && DECL_CONTEXT (fndecl) == NULL_TREE)
6292 expand_main_function ();
6295 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6296 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6297 stands for an ellipsis in the identifier list.
6299 PARMLIST is the data returned by get_parm_info for the
6300 parmlist that follows the semicolon.
6302 We return a value of the same sort that get_parm_info returns,
6303 except that it describes the combination of identifiers and parmlist. */
6306 combine_parm_decls (specparms, parmlist, void_at_end)
6307 tree specparms, parmlist;
6310 register tree fndecl = current_function_decl;
6313 tree parmdecls = TREE_PURPOSE (parmlist);
6315 /* This is a chain of any other decls that came in among the parm
6316 declarations. They were separated already by get_parm_info,
6317 so we just need to keep them separate. */
6318 tree nonparms = TREE_VALUE (parmlist);
6322 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6323 DECL_WEAK (parm) = 0;
6325 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6327 register tree tail, found = NULL;
6329 /* See if any of the parmdecls specifies this parm by name. */
6330 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6331 if (DECL_NAME (tail) == TREE_VALUE (parm))
6337 /* If declaration already marked, we have a duplicate name.
6338 Complain, and don't use this decl twice. */
6339 if (found && DECL_WEAK (found))
6341 error_with_decl (found, "multiple parameters named `%s'");
6345 /* If the declaration says "void", complain and ignore it. */
6346 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6348 error_with_decl (found, "parameter `%s' declared void");
6349 TREE_TYPE (found) = integer_type_node;
6350 DECL_ARG_TYPE (found) = integer_type_node;
6351 layout_decl (found, 0);
6354 /* Traditionally, a parm declared float is actually a double. */
6355 if (found && flag_traditional
6356 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6358 TREE_TYPE (found) = double_type_node;
6359 DECL_ARG_TYPE (found) = double_type_node;
6360 layout_decl (found, 0);
6363 /* If no declaration found, default to int. */
6366 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6368 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6369 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6370 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6371 error_with_decl (found, "type of parameter `%s' is not declared");
6375 TREE_PURPOSE (parm) = found;
6377 /* Mark this decl as "already found". */
6378 DECL_WEAK (found) = 1;
6381 /* Complain about any actual PARM_DECLs not matched with any names. */
6383 for (parm = parmdecls; parm; )
6385 tree next = TREE_CHAIN (parm);
6386 TREE_CHAIN (parm) = 0;
6388 /* Complain about args with incomplete types. */
6389 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6391 error_with_decl (parm, "parameter `%s' has incomplete type");
6392 TREE_TYPE (parm) = error_mark_node;
6395 if (! DECL_WEAK (parm))
6397 error_with_decl (parm,
6398 "declaration for parameter `%s' but no such parameter");
6399 /* Pretend the parameter was not missing.
6400 This gets us to a standard state and minimizes
6401 further error messages. */
6403 = chainon (specparms,
6404 tree_cons (parm, NULL_TREE, NULL_TREE));
6410 /* Chain the declarations together in the order of the list of names.
6411 At the same time, build up a list of their types, in reverse order. */
6417 for (last = 0; parm; parm = TREE_CHAIN (parm))
6418 if (TREE_PURPOSE (parm))
6421 parmdecls = TREE_PURPOSE (parm);
6423 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6424 last = TREE_PURPOSE (parm);
6425 TREE_CHAIN (last) = 0;
6427 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6432 return tree_cons (parmdecls, nonparms,
6433 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6435 return tree_cons (parmdecls, nonparms, nreverse (types));
6438 /* Finish up a function declaration and compile that function
6439 all the way to assembler language output. The free the storage
6440 for the function definition.
6442 This is called after parsing the body of the function definition.
6444 NESTED is nonzero if the function being finished is nested in another. */
6447 finish_function (nested)
6450 register tree fndecl = current_function_decl;
6452 /* TREE_READONLY (fndecl) = 1;
6453 This caused &foo to be of type ptr-to-const-function
6454 which then got a warning when stored in a ptr-to-function variable. */
6457 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6459 /* Must mark the RESULT_DECL as being in this function. */
6461 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6463 /* Obey `register' declarations if `setjmp' is called in this fn. */
6464 if (flag_traditional && current_function_calls_setjmp)
6466 setjmp_protect (DECL_INITIAL (fndecl));
6467 setjmp_protect_args ();
6470 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6472 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6473 != integer_type_node)
6475 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6476 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6478 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6482 #ifdef DEFAULT_MAIN_RETURN
6483 /* Make it so that `main' always returns success by default. */
6484 DEFAULT_MAIN_RETURN;
6489 /* Generate rtl for function exit. */
6490 expand_function_end (input_filename, lineno, 0);
6492 /* So we can tell if jump_optimize sets it to 1. */
6495 /* If this is a nested function, protect the local variables in the stack
6496 above us from being collected while we're compiling this function. */
6498 ggc_push_context ();
6500 /* Run the optimizers and output the assembler code for this function. */
6501 rest_of_compilation (fndecl);
6503 /* Undo the GC context switch. */
6507 current_function_returns_null |= can_reach_end;
6509 if (warn_missing_noreturn
6510 && !TREE_THIS_VOLATILE (fndecl)
6511 && !current_function_returns_null
6512 && !current_function_returns_value)
6513 warning ("function might be possible candidate for attribute `noreturn'");
6515 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6516 warning ("`noreturn' function does return");
6517 else if (warn_return_type && can_reach_end
6518 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6519 /* If this function returns non-void and control can drop through,
6521 warning ("control reaches end of non-void function");
6522 /* With just -W, complain only if function returns both with
6523 and without a value. */
6524 else if (extra_warnings
6525 && current_function_returns_value && current_function_returns_null)
6526 warning ("this function may return with or without a value");
6528 /* If requested, warn about function definitions where the function will
6529 return a value (usually of some struct or union type) which itself will
6530 take up a lot of stack space. */
6532 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6534 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6536 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6537 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6540 unsigned int size_as_int
6541 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6543 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6544 warning_with_decl (fndecl,
6545 "size of return value of `%s' is %u bytes",
6548 warning_with_decl (fndecl,
6549 "size of return value of `%s' is larger than %d bytes",
6554 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6556 /* Stop pointing to the local nodes about to be freed.
6557 But DECL_INITIAL must remain nonzero so we know this
6558 was an actual function definition.
6559 For a nested function, this is done in pop_c_function_context.
6560 If rest_of_compilation set this to 0, leave it 0. */
6561 if (DECL_INITIAL (fndecl) != 0)
6562 DECL_INITIAL (fndecl) = error_mark_node;
6564 DECL_ARGUMENTS (fndecl) = 0;
6567 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6569 #ifndef ASM_OUTPUT_CONSTRUCTOR
6570 if (! flag_gnu_linker)
6571 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6574 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6577 if (DECL_STATIC_DESTRUCTOR (fndecl))
6579 #ifndef ASM_OUTPUT_DESTRUCTOR
6580 if (! flag_gnu_linker)
6581 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6584 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6589 /* Let the error reporting routines know that we're outside a
6590 function. For a nested function, this value is used in
6591 pop_c_function_context and then reset via pop_function_context. */
6592 current_function_decl = NULL;
6596 /* Save and restore the variables in this file and elsewhere
6597 that keep track of the progress of compilation of the current function.
6598 Used for nested functions. */
6600 struct language_function
6603 tree shadowed_labels;
6606 int warn_about_return_type;
6608 struct binding_level *binding_level;
6611 /* Save and reinitialize the variables
6612 used during compilation of a C function. */
6615 push_c_function_context (f)
6618 struct language_function *p;
6619 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6622 p->named_labels = named_labels;
6623 p->shadowed_labels = shadowed_labels;
6624 p->returns_value = current_function_returns_value;
6625 p->returns_null = current_function_returns_null;
6626 p->warn_about_return_type = warn_about_return_type;
6627 p->extern_inline = current_extern_inline;
6628 p->binding_level = current_binding_level;
6631 /* Restore the variables used during compilation of a C function. */
6634 pop_c_function_context (f)
6637 struct language_function *p = f->language;
6640 /* Bring back all the labels that were shadowed. */
6641 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6642 if (DECL_NAME (TREE_VALUE (link)) != 0)
6643 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6644 = TREE_VALUE (link);
6646 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6648 /* Stop pointing to the local nodes about to be freed. */
6649 /* But DECL_INITIAL must remain nonzero so we know this
6650 was an actual function definition. */
6651 DECL_INITIAL (current_function_decl) = error_mark_node;
6652 DECL_ARGUMENTS (current_function_decl) = 0;
6655 named_labels = p->named_labels;
6656 shadowed_labels = p->shadowed_labels;
6657 current_function_returns_value = p->returns_value;
6658 current_function_returns_null = p->returns_null;
6659 warn_about_return_type = p->warn_about_return_type;
6660 current_extern_inline = p->extern_inline;
6661 current_binding_level = p->binding_level;
6667 /* Mark the language specific parts of F for GC. */
6669 mark_c_function_context (f)
6672 struct language_function *p = f->language;
6677 ggc_mark_tree (p->shadowed_labels);
6678 ggc_mark_tree (p->named_labels);
6679 mark_binding_level (&p->binding_level);
6682 /* integrate_decl_tree calls this function, but since we don't use the
6683 DECL_LANG_SPECIFIC field, this is a no-op. */
6686 copy_lang_decl (node)
6687 tree node ATTRIBUTE_UNUSED;
6691 /* Mark ARG for GC. */
6693 lang_mark_false_label_stack (arg)
6694 struct label_node *arg;
6696 /* C doesn't use false_label_stack. It better be NULL. */
6701 /* Mark the language specific bits in T for GC. */
6706 if (TREE_CODE (t) == IDENTIFIER_NODE)
6708 struct lang_identifier *i = (struct lang_identifier *) t;
6709 ggc_mark_tree (i->global_value);
6710 ggc_mark_tree (i->local_value);
6711 ggc_mark_tree (i->label_value);
6712 ggc_mark_tree (i->implicit_decl);
6713 ggc_mark_tree (i->error_locus);
6714 ggc_mark_tree (i->limbo_value);
6716 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6717 ggc_mark (TYPE_LANG_SPECIFIC (t));