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. */
44 extern cpp_reader parse_in;
47 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
49 { NORMAL, /* Ordinary declaration */
50 FUNCDEF, /* Function definition */
51 PARM, /* Declaration of parm before function body */
52 FIELD, /* Declaration inside struct or union */
53 BITFIELD, /* Likewise but with specified width */
54 TYPENAME}; /* Typename (inside cast or sizeof) */
56 /* We let tm.h override the types used here, to handle trivial differences
57 such as the choice of unsigned int or long unsigned int for size_t.
58 When machines start needing nontrivial differences in the size type,
59 it would be best to do something here to figure out automatically
60 from other information what type to use. */
63 #define SIZE_TYPE "long unsigned int"
67 #define PTRDIFF_TYPE "long int"
71 #define WCHAR_TYPE "int"
77 /* Nonzero if we have seen an invalid cross reference
78 to a struct, union, or enum, but not yet printed the message. */
80 tree pending_invalid_xref;
81 /* File and line to appear in the eventual error message. */
82 char *pending_invalid_xref_file;
83 int pending_invalid_xref_line;
85 /* While defining an enum type, this is 1 plus the last enumerator
86 constant value. Note that will do not have to save this or `enum_overflow'
87 around nested function definition since such a definition could only
88 occur in an enum value expression and we don't use these variables in
91 static tree enum_next_value;
93 /* Nonzero means that there was overflow computing enum_next_value. */
95 static int enum_overflow;
97 /* Parsing a function declarator leaves a list of parameter names
98 or a chain or parameter decls here. */
100 static tree last_function_parms;
102 /* Parsing a function declarator leaves here a chain of structure
103 and enum types declared in the parmlist. */
105 static tree last_function_parm_tags;
107 /* After parsing the declarator that starts a function definition,
108 `start_function' puts here the list of parameter names or chain of decls.
109 `store_parm_decls' finds it here. */
111 static tree current_function_parms;
113 /* Similar, for last_function_parm_tags. */
114 static tree current_function_parm_tags;
116 /* Similar, for the file and line that the prototype came from if this is
117 an old-style definition. */
118 static char *current_function_prototype_file;
119 static int current_function_prototype_line;
121 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
122 that have names. Here so we can clear out their names' definitions
123 at the end of the function. */
125 static tree named_labels;
127 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
129 static tree shadowed_labels;
131 /* Nonzero when store_parm_decls is called indicates a varargs function.
132 Value not meaningful after store_parm_decls. */
134 static int c_function_varargs;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement that specifies a return value is seen. */
139 int current_function_returns_value;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a return statement with no argument is seen. */
144 int current_function_returns_null;
146 /* Set to nonzero by `grokdeclarator' for a function
147 whose return type is defaulted, if warnings for this are desired. */
149 static int warn_about_return_type;
151 /* Nonzero when starting a function declared `extern inline'. */
153 static int current_extern_inline;
155 /* For each binding contour we allocate a binding_level structure
156 * which records the names defined in that contour.
159 * 1) one for each function definition,
160 * where internal declarations of the parameters appear.
161 * 2) one for each compound statement,
162 * to record its declarations.
164 * The current meaning of a name can be found by searching the levels from
165 * the current one out to the global one.
168 /* Note that the information in the `names' component of the global contour
169 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
173 /* A chain of _DECL nodes for all variables, constants, functions,
174 and typedef types. These are in the reverse of the order supplied.
178 /* A list of structure, union and enum definitions,
179 * for looking up tag names.
180 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
181 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
182 * or ENUMERAL_TYPE node.
186 /* For each level, a list of shadowed outer-level local definitions
187 to be restored when this level is popped.
188 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
189 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
192 /* For each level (except not the global one),
193 a chain of BLOCK nodes for all the levels
194 that were entered and exited one level down. */
197 /* The BLOCK node for this level, if one has been preallocated.
198 If 0, the BLOCK is allocated (if needed) when the level is popped. */
201 /* The binding level which this one is contained in (inherits from). */
202 struct binding_level *level_chain;
204 /* Nonzero for the level that holds the parameters of a function. */
207 /* Nonzero if this level "doesn't exist" for tags. */
208 char tag_transparent;
210 /* Nonzero if sublevels of this level "don't exist" for tags.
211 This is set in the parm level of a function definition
212 while reading the function body, so that the outermost block
213 of the function body will be tag-transparent. */
214 char subblocks_tag_transparent;
216 /* Nonzero means make a BLOCK for this level regardless of all else. */
219 /* Nonzero means make a BLOCK if this level has any subblocks. */
220 char keep_if_subblocks;
222 /* Number of decls in `names' that have incomplete
223 structure or union types. */
226 /* A list of decls giving the (reversed) specified order of parms,
227 not including any forward-decls in the parmlist.
228 This is so we can put the parms in proper order for assign_parms. */
232 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
234 /* The binding level currently in effect. */
236 static struct binding_level *current_binding_level;
238 /* A chain of binding_level structures awaiting reuse. */
240 static struct binding_level *free_binding_level;
242 /* The outermost binding level, for names of file scope.
243 This is created when the compiler is started and exists
244 through the entire run. */
246 static struct binding_level *global_binding_level;
248 /* Binding level structures are initialized by copying this one. */
250 static struct binding_level clear_binding_level
251 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
254 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
256 static int keep_next_level_flag;
258 /* Nonzero means make a BLOCK for the next level pushed
259 if it has subblocks. */
261 static int keep_next_if_subblocks;
263 /* The chain of outer levels of label scopes.
264 This uses the same data structure used for binding levels,
265 but it works differently: each link in the chain records
266 saved values of named_labels and shadowed_labels for
267 a label binding level outside the current one. */
269 static struct binding_level *label_level_chain;
271 /* Functions called automatically at the beginning and end of execution. */
273 tree static_ctors, static_dtors;
275 /* Forward declarations. */
277 static struct binding_level * make_binding_level PARAMS ((void));
278 static void mark_binding_level PARAMS ((void *));
279 static void clear_limbo_values PARAMS ((tree));
280 static int duplicate_decls PARAMS ((tree, tree, int));
281 static int redeclaration_error_message PARAMS ((tree, tree));
282 static void storedecls PARAMS ((tree));
283 static void storetags PARAMS ((tree));
284 static tree lookup_tag PARAMS ((enum tree_code, tree,
285 struct binding_level *, int));
286 static tree lookup_tag_reverse PARAMS ((tree));
287 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
289 static tree grokparms PARAMS ((tree, int));
290 static void layout_array_type PARAMS ((tree));
291 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
293 /* C-specific option variables. */
295 /* Nonzero means allow type mismatches in conditional expressions;
296 just make their values `void'. */
298 int flag_cond_mismatch;
300 /* Nonzero means give `double' the same size as `float'. */
302 int flag_short_double;
304 /* Nonzero means give `wchar_t' the same size as `short'. */
306 int flag_short_wchar;
308 /* Nonzero means don't recognize the keyword `asm'. */
312 /* Nonzero means don't recognize any builtin functions. */
316 /* Nonzero means don't recognize the non-ANSI builtin functions.
319 int flag_no_nonansi_builtin;
321 /* Nonzero means do some things the same way PCC does. */
323 int flag_traditional;
325 /* Nonzero means use the ISO C99 dialect of C. */
329 /* Nonzero means that we have builtin functions, and main is an int */
333 /* Nonzero means to allow single precision math even if we're generally
334 being traditional. */
335 int flag_allow_single_precision = 0;
337 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
339 int flag_signed_bitfields = 1;
340 int explicit_flag_signed_bitfields = 0;
342 /* Nonzero means warn about use of implicit int. */
344 int warn_implicit_int;
346 /* Nonzero means warn about usage of long long when `-pedantic'. */
348 int warn_long_long = 1;
350 /* Nonzero means message about use of implicit function declarations;
351 1 means warning; 2 means error. */
353 int mesg_implicit_function_declaration;
355 /* Nonzero means give string constants the type `const char *'
356 to get extra warnings from them. These warnings will be too numerous
357 to be useful, except in thoroughly ANSIfied programs. */
359 int flag_const_strings;
361 /* Nonzero means warn about pointer casts that can drop a type qualifier
362 from the pointer target type. */
366 /* Nonzero means warn when casting a function call to a type that does
367 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
368 when there is no previous declaration of sqrt or malloc. */
370 int warn_bad_function_cast;
372 /* Warn about functions which might be candidates for attribute noreturn. */
374 int warn_missing_noreturn;
376 /* Warn about traditional constructs whose meanings changed in ANSI C. */
378 int warn_traditional;
380 /* Nonzero means warn about sizeof(function) or addition/subtraction
381 of function pointers. */
383 int warn_pointer_arith;
385 /* Nonzero means warn for non-prototype function decls
386 or non-prototyped defs without previous prototype. */
388 int warn_strict_prototypes;
390 /* Nonzero means warn for any global function def
391 without separate previous prototype decl. */
393 int warn_missing_prototypes;
395 /* Nonzero means warn for any global function def
396 without separate previous decl. */
398 int warn_missing_declarations;
400 /* Nonzero means warn about multiple (redundant) decls for the same single
401 variable or function. */
403 int warn_redundant_decls = 0;
405 /* Nonzero means warn about extern declarations of objects not at
406 file-scope level and about *all* declarations of functions (whether
407 extern or static) not at file-scope level. Note that we exclude
408 implicit function declarations. To get warnings about those, use
411 int warn_nested_externs = 0;
413 /* Warn about *printf or *scanf format/argument anomalies. */
417 /* Warn about a subscript that has type char. */
419 int warn_char_subscripts = 0;
421 /* Warn if a type conversion is done that might have confusing results. */
425 /* Warn if adding () is suggested. */
427 int warn_parentheses;
429 /* Warn if initializer is not completely bracketed. */
431 int warn_missing_braces;
433 /* Warn if main is suspicious. */
437 /* Warn about #pragma directives that are not recognised. */
439 int warn_unknown_pragmas = 0; /* Tri state variable. */
441 /* Warn about comparison of signed and unsigned values.
442 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
444 int warn_sign_compare = -1;
446 /* Warn about testing equality of floating point numbers. */
448 int warn_float_equal = 0;
450 /* Nonzero means warn about use of multicharacter literals. */
452 int warn_multichar = 1;
454 /* Nonzero means `$' can be in an identifier. */
456 #ifndef DOLLARS_IN_IDENTIFIERS
457 #define DOLLARS_IN_IDENTIFIERS 1
459 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
461 /* Decode the string P as a language-specific option for C.
462 Return the number of strings consumed. Should not complain
463 if it does not recognise the option. */
466 c_decode_option (argc, argv)
467 int argc ATTRIBUTE_UNUSED;
470 int strings_processed;
473 strings_processed = cpp_handle_option (&parse_in, argc, argv);
475 strings_processed = 0;
476 #endif /* ! USE_CPPLIB */
478 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
480 flag_traditional = 1;
481 flag_writable_strings = 1;
483 else if (!strcmp (p, "-fallow-single-precision"))
484 flag_allow_single_precision = 1;
485 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
490 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
494 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
498 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
500 flag_traditional = 0;
501 flag_writable_strings = 0;
503 else if (!strncmp (p, "-std=", 5))
505 /* Select the appropriate language standard. We currently
507 -std=iso9899:1990 same as -ansi
508 -std=iso9899:199409 ISO C as modified in amend. 1
509 -std=iso9899:1999 ISO C 99
510 -std=c89 same as -std=iso9899:1990
511 -std=c99 same as -std=iso9899:1999
512 -std=gnu89 default, iso9899:1990 + gnu extensions
513 -std=gnu99 iso9899:1999 + gnu extensions
515 const char *argstart = &p[5];
517 if (!strcmp (argstart, "iso9899:1990")
518 || !strcmp (argstart, "c89"))
521 flag_traditional = 0;
522 flag_writable_strings = 0;
524 flag_no_nonansi_builtin = 1;
527 else if (!strcmp (argstart, "iso9899:199409"))
529 /* ??? The changes since ISO C 1990 are not supported. */
532 else if (!strcmp (argstart, "iso9899:199x")
533 || !strcmp (argstart, "iso9899:1999")
534 || !strcmp (argstart, "c9x")
535 || !strcmp (argstart, "c99"))
537 flag_traditional = 0;
538 flag_writable_strings = 0;
540 flag_no_nonansi_builtin = 1;
543 else if (!strcmp (argstart, "gnu89"))
545 flag_traditional = 0;
546 flag_writable_strings = 0;
548 flag_no_nonansi_builtin = 0;
551 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
553 flag_traditional = 0;
554 flag_writable_strings = 0;
556 flag_no_nonansi_builtin = 0;
560 error ("unknown C standard `%s'", argstart);
562 else if (!strcmp (p, "-fdollars-in-identifiers"))
563 dollars_in_ident = 1;
564 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
565 dollars_in_ident = 0;
566 else if (!strcmp (p, "-fsigned-char"))
567 flag_signed_char = 1;
568 else if (!strcmp (p, "-funsigned-char"))
569 flag_signed_char = 0;
570 else if (!strcmp (p, "-fno-signed-char"))
571 flag_signed_char = 0;
572 else if (!strcmp (p, "-fno-unsigned-char"))
573 flag_signed_char = 1;
574 else if (!strcmp (p, "-fsigned-bitfields")
575 || !strcmp (p, "-fno-unsigned-bitfields"))
577 flag_signed_bitfields = 1;
578 explicit_flag_signed_bitfields = 1;
580 else if (!strcmp (p, "-funsigned-bitfields")
581 || !strcmp (p, "-fno-signed-bitfields"))
583 flag_signed_bitfields = 0;
584 explicit_flag_signed_bitfields = 1;
586 else if (!strcmp (p, "-fshort-enums"))
587 flag_short_enums = 1;
588 else if (!strcmp (p, "-fno-short-enums"))
589 flag_short_enums = 0;
590 else if (!strcmp (p, "-fshort-wchar"))
591 flag_short_wchar = 1;
592 else if (!strcmp (p, "-fno-short-wchar"))
593 flag_short_wchar = 0;
594 else if (!strcmp (p, "-fcond-mismatch"))
595 flag_cond_mismatch = 1;
596 else if (!strcmp (p, "-fno-cond-mismatch"))
597 flag_cond_mismatch = 0;
598 else if (!strcmp (p, "-fshort-double"))
599 flag_short_double = 1;
600 else if (!strcmp (p, "-fno-short-double"))
601 flag_short_double = 0;
602 else if (!strcmp (p, "-fasm"))
604 else if (!strcmp (p, "-fno-asm"))
606 else if (!strcmp (p, "-fbuiltin"))
608 else if (!strcmp (p, "-fno-builtin"))
610 else if (!strcmp (p, "-ansi"))
612 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
613 mesg_implicit_function_declaration = 2;
614 else if (!strcmp (p, "-Wimplicit-function-declaration"))
615 mesg_implicit_function_declaration = 1;
616 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
617 mesg_implicit_function_declaration = 0;
618 else if (!strcmp (p, "-Wimplicit-int"))
619 warn_implicit_int = 1;
620 else if (!strcmp (p, "-Wno-implicit-int"))
621 warn_implicit_int = 0;
622 else if (!strcmp (p, "-Wimplicit"))
624 warn_implicit_int = 1;
625 if (mesg_implicit_function_declaration != 2)
626 mesg_implicit_function_declaration = 1;
628 else if (!strcmp (p, "-Wno-implicit"))
629 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
630 else if (!strcmp (p, "-Wlong-long"))
632 else if (!strcmp (p, "-Wno-long-long"))
634 else if (!strcmp (p, "-Wwrite-strings"))
635 flag_const_strings = 1;
636 else if (!strcmp (p, "-Wno-write-strings"))
637 flag_const_strings = 0;
638 else if (!strcmp (p, "-Wcast-qual"))
640 else if (!strcmp (p, "-Wno-cast-qual"))
642 else if (!strcmp (p, "-Wbad-function-cast"))
643 warn_bad_function_cast = 1;
644 else if (!strcmp (p, "-Wno-bad-function-cast"))
645 warn_bad_function_cast = 0;
646 else if (!strcmp (p, "-Wmissing-noreturn"))
647 warn_missing_noreturn = 1;
648 else if (!strcmp (p, "-Wno-missing-noreturn"))
649 warn_missing_noreturn = 0;
650 else if (!strcmp (p, "-Wpointer-arith"))
651 warn_pointer_arith = 1;
652 else if (!strcmp (p, "-Wno-pointer-arith"))
653 warn_pointer_arith = 0;
654 else if (!strcmp (p, "-Wstrict-prototypes"))
655 warn_strict_prototypes = 1;
656 else if (!strcmp (p, "-Wno-strict-prototypes"))
657 warn_strict_prototypes = 0;
658 else if (!strcmp (p, "-Wmissing-prototypes"))
659 warn_missing_prototypes = 1;
660 else if (!strcmp (p, "-Wno-missing-prototypes"))
661 warn_missing_prototypes = 0;
662 else if (!strcmp (p, "-Wmissing-declarations"))
663 warn_missing_declarations = 1;
664 else if (!strcmp (p, "-Wno-missing-declarations"))
665 warn_missing_declarations = 0;
666 else if (!strcmp (p, "-Wredundant-decls"))
667 warn_redundant_decls = 1;
668 else if (!strcmp (p, "-Wno-redundant-decls"))
669 warn_redundant_decls = 0;
670 else if (!strcmp (p, "-Wnested-externs"))
671 warn_nested_externs = 1;
672 else if (!strcmp (p, "-Wno-nested-externs"))
673 warn_nested_externs = 0;
674 else if (!strcmp (p, "-Wtraditional"))
675 warn_traditional = 1;
676 else if (!strcmp (p, "-Wno-traditional"))
677 warn_traditional = 0;
678 else if (!strncmp (p, "-Wformat=", 9))
679 warn_format = atol (p + 9);
680 else if (!strcmp (p, "-Wformat"))
682 else if (!strcmp (p, "-Wno-format"))
684 else if (!strcmp (p, "-Wchar-subscripts"))
685 warn_char_subscripts = 1;
686 else if (!strcmp (p, "-Wno-char-subscripts"))
687 warn_char_subscripts = 0;
688 else if (!strcmp (p, "-Wconversion"))
690 else if (!strcmp (p, "-Wno-conversion"))
692 else if (!strcmp (p, "-Wparentheses"))
693 warn_parentheses = 1;
694 else if (!strcmp (p, "-Wno-parentheses"))
695 warn_parentheses = 0;
696 else if (!strcmp (p, "-Wreturn-type"))
697 warn_return_type = 1;
698 else if (!strcmp (p, "-Wno-return-type"))
699 warn_return_type = 0;
700 else if (!strcmp (p, "-Wcomment"))
701 ; /* cpp handles this one. */
702 else if (!strcmp (p, "-Wno-comment"))
703 ; /* cpp handles this one. */
704 else if (!strcmp (p, "-Wcomments"))
705 ; /* cpp handles this one. */
706 else if (!strcmp (p, "-Wno-comments"))
707 ; /* cpp handles this one. */
708 else if (!strcmp (p, "-Wtrigraphs"))
709 ; /* cpp handles this one. */
710 else if (!strcmp (p, "-Wno-trigraphs"))
711 ; /* cpp handles this one. */
712 else if (!strcmp (p, "-Wundef"))
713 ; /* cpp handles this one. */
714 else if (!strcmp (p, "-Wno-undef"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p, "-Wimport"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wno-import"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wmissing-braces"))
721 warn_missing_braces = 1;
722 else if (!strcmp (p, "-Wno-missing-braces"))
723 warn_missing_braces = 0;
724 else if (!strcmp (p, "-Wmain"))
726 else if (!strcmp (p, "-Wno-main"))
728 else if (!strcmp (p, "-Wsign-compare"))
729 warn_sign_compare = 1;
730 else if (!strcmp (p, "-Wno-sign-compare"))
731 warn_sign_compare = 0;
732 else if (!strcmp (p, "-Wfloat-equal"))
733 warn_float_equal = 1;
734 else if (!strcmp (p, "-Wno-float-equal"))
735 warn_float_equal = 0;
736 else if (!strcmp (p, "-Wmultichar"))
738 else if (!strcmp (p, "-Wno-multichar"))
740 else if (!strcmp (p, "-Wunknown-pragmas"))
741 /* Set to greater than 1, so that even unknown pragmas in system
742 headers will be warned about. */
743 warn_unknown_pragmas = 2;
744 else if (!strcmp (p, "-Wno-unknown-pragmas"))
745 warn_unknown_pragmas = 0;
746 else if (!strcmp (p, "-Wall"))
748 /* We save the value of warn_uninitialized, since if they put
749 -Wuninitialized on the command line, we need to generate a
750 warning about not using it without also specifying -O. */
751 if (warn_uninitialized != 1)
752 warn_uninitialized = 2;
753 warn_implicit_int = 1;
754 mesg_implicit_function_declaration = 1;
755 warn_return_type = 1;
759 warn_char_subscripts = 1;
760 warn_parentheses = 1;
761 warn_missing_braces = 1;
762 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
763 it off only if it's not explicit. */
765 /* Only warn about unknown pragmas that are not in system headers. */
766 warn_unknown_pragmas = 1;
769 return strings_processed;
774 /* Hooks for print_node. */
777 print_lang_decl (file, node, indent)
778 FILE *file ATTRIBUTE_UNUSED;
779 tree node ATTRIBUTE_UNUSED;
780 int indent ATTRIBUTE_UNUSED;
785 print_lang_type (file, node, indent)
786 FILE *file ATTRIBUTE_UNUSED;
787 tree node ATTRIBUTE_UNUSED;
788 int indent ATTRIBUTE_UNUSED;
793 print_lang_identifier (file, node, indent)
798 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
799 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
800 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
801 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
802 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
803 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
806 /* Hook called at end of compilation to assume 1 elt
807 for a top-level array decl that wasn't complete before. */
810 finish_incomplete_decl (decl)
813 if (TREE_CODE (decl) == VAR_DECL)
815 tree type = TREE_TYPE (decl);
816 if (type != error_mark_node
817 && TREE_CODE (type) == ARRAY_TYPE
818 && TYPE_DOMAIN (type) == 0)
820 if (! DECL_EXTERNAL (decl))
821 warning_with_decl (decl, "array `%s' assumed to have one element");
823 complete_array_type (type, NULL_TREE, 1);
825 layout_decl (decl, 0);
830 /* Create a new `struct binding_level'. */
833 struct binding_level *
834 make_binding_level ()
837 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
840 /* Nonzero if we are currently in the global binding level. */
845 return current_binding_level == global_binding_level;
851 keep_next_level_flag = 1;
854 /* Nonzero if the current level needs to have a BLOCK made. */
859 return ((current_binding_level->keep_if_subblocks
860 && current_binding_level->blocks != 0)
861 || current_binding_level->keep
862 || current_binding_level->names != 0
863 || (current_binding_level->tags != 0
864 && !current_binding_level->tag_transparent));
867 /* Identify this binding level as a level of parameters.
868 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
869 But it turns out there is no way to pass the right value for
870 DEFINITION_FLAG, so we ignore it. */
873 declare_parm_level (definition_flag)
874 int definition_flag ATTRIBUTE_UNUSED;
876 current_binding_level->parm_flag = 1;
879 /* Nonzero if currently making parm declarations. */
884 return current_binding_level->parm_flag;
887 /* Enter a new binding level.
888 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
889 not for that of tags. */
892 pushlevel (tag_transparent)
895 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
897 /* If this is the top level of a function,
898 just make sure that NAMED_LABELS is 0. */
900 if (current_binding_level == global_binding_level)
905 /* Reuse or create a struct for this binding level. */
907 if (free_binding_level)
909 newlevel = free_binding_level;
910 free_binding_level = free_binding_level->level_chain;
914 newlevel = make_binding_level ();
917 /* Add this level to the front of the chain (stack) of levels that
920 *newlevel = clear_binding_level;
921 newlevel->tag_transparent
923 || (current_binding_level
924 ? current_binding_level->subblocks_tag_transparent
926 newlevel->level_chain = current_binding_level;
927 current_binding_level = newlevel;
928 newlevel->keep = keep_next_level_flag;
929 keep_next_level_flag = 0;
930 newlevel->keep_if_subblocks = keep_next_if_subblocks;
931 keep_next_if_subblocks = 0;
934 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
937 clear_limbo_values (block)
942 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
943 if (DECL_NAME (tem) != 0)
944 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
946 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
947 clear_limbo_values (tem);
950 /* Exit a binding level.
951 Pop the level off, and restore the state of the identifier-decl mappings
952 that were in effect when this level was entered.
954 If KEEP is nonzero, this level had explicit declarations, so
955 and create a "block" (a BLOCK node) for the level
956 to record its declarations and subblocks for symbol table output.
958 If FUNCTIONBODY is nonzero, this level is the body of a function,
959 so create a block as if KEEP were set and also clear out all
962 If REVERSE is nonzero, reverse the order of decls before putting
963 them into the BLOCK. */
966 poplevel (keep, reverse, functionbody)
972 /* The chain of decls was accumulated in reverse order.
973 Put it into forward order, just for cleanliness. */
975 tree tags = current_binding_level->tags;
976 tree subblocks = current_binding_level->blocks;
979 int block_previously_created;
981 keep |= current_binding_level->keep;
983 /* This warning is turned off because it causes warnings for
984 declarations like `extern struct foo *x'. */
986 /* Warn about incomplete structure types in this level. */
987 for (link = tags; link; link = TREE_CHAIN (link))
988 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
990 tree type = TREE_VALUE (link);
991 tree type_name = TYPE_NAME (type);
992 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
994 : DECL_NAME (type_name));
995 switch (TREE_CODE (type))
998 error ("`struct %s' incomplete in scope ending here", id);
1001 error ("`union %s' incomplete in scope ending here", id);
1004 error ("`enum %s' incomplete in scope ending here", id);
1010 /* Get the decls in the order they were written.
1011 Usually current_binding_level->names is in reverse order.
1012 But parameter decls were previously put in forward order. */
1015 current_binding_level->names
1016 = decls = nreverse (current_binding_level->names);
1018 decls = current_binding_level->names;
1020 /* Output any nested inline functions within this block
1021 if they weren't already output. */
1023 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1024 if (TREE_CODE (decl) == FUNCTION_DECL
1025 && ! TREE_ASM_WRITTEN (decl)
1026 && DECL_INITIAL (decl) != 0
1027 && TREE_ADDRESSABLE (decl))
1029 /* If this decl was copied from a file-scope decl
1030 on account of a block-scope extern decl,
1031 propagate TREE_ADDRESSABLE to the file-scope decl.
1033 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1034 true, since then the decl goes through save_for_inline_copying. */
1035 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1036 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1037 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1038 else if (DECL_SAVED_INSNS (decl) != 0)
1040 push_function_context ();
1041 output_inline_function (decl);
1042 pop_function_context ();
1046 /* If there were any declarations or structure tags in that level,
1047 or if this level is a function body,
1048 create a BLOCK to record them for the life of this function. */
1051 block_previously_created = (current_binding_level->this_block != 0);
1052 if (block_previously_created)
1053 block = current_binding_level->this_block;
1054 else if (keep || functionbody
1055 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1056 block = make_node (BLOCK);
1059 BLOCK_VARS (block) = decls;
1060 BLOCK_SUBBLOCKS (block) = subblocks;
1063 /* In each subblock, record that this is its superior. */
1065 for (link = subblocks; link; link = TREE_CHAIN (link))
1066 BLOCK_SUPERCONTEXT (link) = block;
1068 /* Clear out the meanings of the local variables of this level. */
1070 for (link = decls; link; link = TREE_CHAIN (link))
1072 if (DECL_NAME (link) != 0)
1074 /* If the ident. was used or addressed via a local extern decl,
1075 don't forget that fact. */
1076 if (DECL_EXTERNAL (link))
1078 if (TREE_USED (link))
1079 TREE_USED (DECL_NAME (link)) = 1;
1080 if (TREE_ADDRESSABLE (link))
1081 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1083 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1087 /* Restore all name-meanings of the outer levels
1088 that were shadowed by this level. */
1090 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1091 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1093 /* If the level being exited is the top level of a function,
1094 check over all the labels, and clear out the current
1095 (function local) meanings of their names. */
1099 clear_limbo_values (block);
1101 /* If this is the top level block of a function,
1102 the vars are the function's parameters.
1103 Don't leave them in the BLOCK because they are
1104 found in the FUNCTION_DECL instead. */
1106 BLOCK_VARS (block) = 0;
1108 /* Clear out the definitions of all label names,
1109 since their scopes end here,
1110 and add them to BLOCK_VARS. */
1112 for (link = named_labels; link; link = TREE_CHAIN (link))
1114 register tree label = TREE_VALUE (link);
1116 if (DECL_INITIAL (label) == 0)
1118 error_with_decl (label, "label `%s' used but not defined");
1119 /* Avoid crashing later. */
1120 define_label (input_filename, lineno,
1123 else if (warn_unused && !TREE_USED (label))
1124 warning_with_decl (label, "label `%s' defined but not used");
1125 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1127 /* Put the labels into the "variables" of the
1128 top-level block, so debugger can see them. */
1129 TREE_CHAIN (label) = BLOCK_VARS (block);
1130 BLOCK_VARS (block) = label;
1134 /* Pop the current level, and free the structure for reuse. */
1137 register struct binding_level *level = current_binding_level;
1138 current_binding_level = current_binding_level->level_chain;
1140 level->level_chain = free_binding_level;
1141 free_binding_level = level;
1144 /* Dispose of the block that we just made inside some higher level. */
1146 DECL_INITIAL (current_function_decl) = block;
1149 if (!block_previously_created)
1150 current_binding_level->blocks
1151 = chainon (current_binding_level->blocks, block);
1153 /* If we did not make a block for the level just exited,
1154 any blocks made for inner levels
1155 (since they cannot be recorded as subblocks in that level)
1156 must be carried forward so they will later become subblocks
1157 of something else. */
1159 current_binding_level->blocks
1160 = chainon (current_binding_level->blocks, subblocks);
1162 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1163 binding contour so that they point to the appropriate construct, i.e.
1164 either to the current FUNCTION_DECL node, or else to the BLOCK node
1165 we just constructed.
1167 Note that for tagged types whose scope is just the formal parameter
1168 list for some function type specification, we can't properly set
1169 their TYPE_CONTEXTs here, because we don't have a pointer to the
1170 appropriate FUNCTION_TYPE node readily available to us. For those
1171 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1172 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1173 node which will represent the "scope" for these "parameter list local"
1178 for (link = tags; link; link = TREE_CHAIN (link))
1179 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1181 for (link = tags; link; link = TREE_CHAIN (link))
1182 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1185 TREE_USED (block) = 1;
1189 /* Delete the node BLOCK from the current binding level.
1190 This is used for the block inside a stmt expr ({...})
1191 so that the block can be reinserted where appropriate. */
1194 delete_block (block)
1198 if (current_binding_level->blocks == block)
1199 current_binding_level->blocks = TREE_CHAIN (block);
1200 for (t = current_binding_level->blocks; t;)
1202 if (TREE_CHAIN (t) == block)
1203 TREE_CHAIN (t) = TREE_CHAIN (block);
1207 TREE_CHAIN (block) = NULL;
1208 /* Clear TREE_USED which is always set by poplevel.
1209 The flag is set again if insert_block is called. */
1210 TREE_USED (block) = 0;
1213 /* Insert BLOCK at the end of the list of subblocks of the
1214 current binding level. This is used when a BIND_EXPR is expanded,
1215 to handle the BLOCK node inside the BIND_EXPR. */
1218 insert_block (block)
1221 TREE_USED (block) = 1;
1222 current_binding_level->blocks
1223 = chainon (current_binding_level->blocks, block);
1226 /* Set the BLOCK node for the innermost scope
1227 (the one we are currently in). */
1231 register tree block;
1233 current_binding_level->this_block = block;
1239 register struct binding_level *newlevel;
1241 /* Reuse or create a struct for this binding level. */
1243 if (free_binding_level)
1245 newlevel = free_binding_level;
1246 free_binding_level = free_binding_level->level_chain;
1250 newlevel = make_binding_level ();
1253 /* Add this level to the front of the chain (stack) of label levels. */
1255 newlevel->level_chain = label_level_chain;
1256 label_level_chain = newlevel;
1258 newlevel->names = named_labels;
1259 newlevel->shadowed = shadowed_labels;
1261 shadowed_labels = 0;
1267 register struct binding_level *level = label_level_chain;
1270 /* Clear out the definitions of the declared labels in this level.
1271 Leave in the list any ordinary, non-declared labels. */
1272 for (link = named_labels, prev = 0; link;)
1274 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1276 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1278 error_with_decl (TREE_VALUE (link),
1279 "label `%s' used but not defined");
1280 /* Avoid crashing later. */
1281 define_label (input_filename, lineno,
1282 DECL_NAME (TREE_VALUE (link)));
1284 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1285 warning_with_decl (TREE_VALUE (link),
1286 "label `%s' defined but not used");
1287 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1289 /* Delete this element from the list. */
1290 link = TREE_CHAIN (link);
1292 TREE_CHAIN (prev) = link;
1294 named_labels = link;
1299 link = TREE_CHAIN (link);
1303 /* Bring back all the labels that were shadowed. */
1304 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1305 if (DECL_NAME (TREE_VALUE (link)) != 0)
1306 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1307 = TREE_VALUE (link);
1309 named_labels = chainon (named_labels, level->names);
1310 shadowed_labels = level->shadowed;
1312 /* Pop the current level, and free the structure for reuse. */
1313 label_level_chain = label_level_chain->level_chain;
1314 level->level_chain = free_binding_level;
1315 free_binding_level = level;
1318 /* Push a definition or a declaration of struct, union or enum tag "name".
1319 "type" should be the type node.
1320 We assume that the tag "name" is not already defined.
1322 Note that the definition may really be just a forward reference.
1323 In that case, the TYPE_SIZE will be zero. */
1326 pushtag (name, type)
1329 register struct binding_level *b;
1331 /* Find the proper binding level for this type tag. */
1333 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1338 /* Record the identifier as the type's name if it has none. */
1340 if (TYPE_NAME (type) == 0)
1341 TYPE_NAME (type) = name;
1344 b->tags = tree_cons (name, type, b->tags);
1346 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1347 tagged type we just added to the current binding level. This fake
1348 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1349 to output a representation of a tagged type, and it also gives
1350 us a convenient place to record the "scope start" address for the
1353 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1355 /* An approximation for now, so we can tell this is a function-scope tag.
1356 This will be updated in poplevel. */
1357 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1360 /* Handle when a new declaration NEWDECL
1361 has the same name as an old one OLDDECL
1362 in the same binding contour.
1363 Prints an error message if appropriate.
1365 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1366 Otherwise, return 0.
1368 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1369 and OLDDECL is in an outer binding level and should thus not be changed. */
1372 duplicate_decls (newdecl, olddecl, different_binding_level)
1373 register tree newdecl, olddecl;
1374 int different_binding_level;
1376 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1377 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1378 && DECL_INITIAL (newdecl) != 0);
1379 tree oldtype = TREE_TYPE (olddecl);
1380 tree newtype = TREE_TYPE (newdecl);
1383 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1384 DECL_MACHINE_ATTRIBUTES (newdecl)
1385 = merge_machine_decl_attributes (olddecl, newdecl);
1387 if (TREE_CODE (newtype) == ERROR_MARK
1388 || TREE_CODE (oldtype) == ERROR_MARK)
1391 /* New decl is completely inconsistent with the old one =>
1392 tell caller to replace the old one.
1393 This is always an error except in the case of shadowing a builtin. */
1394 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1396 if (TREE_CODE (olddecl) == FUNCTION_DECL
1397 && (DECL_BUILT_IN (olddecl)
1398 || DECL_BUILT_IN_NONANSI (olddecl)))
1400 /* If you declare a built-in or predefined function name as static,
1401 the old definition is overridden,
1402 but optionally warn this was a bad choice of name. */
1403 if (!TREE_PUBLIC (newdecl))
1407 else if (DECL_BUILT_IN (olddecl))
1408 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1410 warning_with_decl (newdecl, "shadowing library function `%s'");
1412 /* Likewise, if the built-in is not ansi, then programs can
1413 override it even globally without an error. */
1414 else if (! DECL_BUILT_IN (olddecl))
1415 warning_with_decl (newdecl,
1416 "library function `%s' declared as non-function");
1418 else if (DECL_BUILT_IN_NONANSI (olddecl))
1419 warning_with_decl (newdecl,
1420 "built-in function `%s' declared as non-function");
1422 warning_with_decl (newdecl,
1423 "built-in function `%s' declared as non-function");
1427 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1428 error_with_decl (olddecl, "previous declaration of `%s'");
1434 /* For real parm decl following a forward decl,
1435 return 1 so old decl will be reused. */
1436 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1437 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1440 /* The new declaration is the same kind of object as the old one.
1441 The declarations may partially match. Print warnings if they don't
1442 match enough. Ultimately, copy most of the information from the new
1443 decl to the old one, and keep using the old one. */
1445 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1446 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1447 && DECL_INITIAL (olddecl) == 0)
1448 /* If -traditional, avoid error for redeclaring fcn
1449 after implicit decl. */
1451 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1452 && DECL_BUILT_IN (olddecl))
1454 /* A function declaration for a built-in function. */
1455 if (!TREE_PUBLIC (newdecl))
1457 /* If you declare a built-in function name as static, the
1458 built-in definition is overridden,
1459 but optionally warn this was a bad choice of name. */
1461 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1462 /* Discard the old built-in function. */
1465 else if (!types_match)
1467 /* Accept the return type of the new declaration if same modes. */
1468 tree oldreturntype = TREE_TYPE (oldtype);
1469 tree newreturntype = TREE_TYPE (newtype);
1471 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1473 /* Function types may be shared, so we can't just modify
1474 the return type of olddecl's function type. */
1476 = build_function_type (newreturntype,
1477 TYPE_ARG_TYPES (oldtype));
1479 types_match = comptypes (newtype, trytype);
1483 /* Accept harmless mismatch in first argument type also.
1485 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1486 && TYPE_ARG_TYPES (oldtype) != 0
1487 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1488 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1489 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1490 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1492 /* Function types may be shared, so we can't just modify
1493 the return type of olddecl's function type. */
1495 = build_function_type (TREE_TYPE (oldtype),
1496 tree_cons (NULL_TREE,
1497 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1498 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1500 types_match = comptypes (newtype, trytype);
1504 if (! different_binding_level)
1505 TREE_TYPE (olddecl) = oldtype;
1509 /* If types don't match for a built-in, throw away the built-in. */
1510 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1514 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1515 && DECL_SOURCE_LINE (olddecl) == 0)
1517 /* A function declaration for a predeclared function
1518 that isn't actually built in. */
1519 if (!TREE_PUBLIC (newdecl))
1521 /* If you declare it as static, the
1522 default definition is overridden. */
1525 else if (!types_match)
1527 /* If the types don't match, preserve volatility indication.
1528 Later on, we will discard everything else about the
1529 default declaration. */
1530 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1533 /* Permit char *foo () to match void *foo (...) if not pedantic,
1534 if one of them came from a system header file. */
1535 else if (!types_match
1536 && TREE_CODE (olddecl) == FUNCTION_DECL
1537 && TREE_CODE (newdecl) == FUNCTION_DECL
1538 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1539 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1540 && (DECL_IN_SYSTEM_HEADER (olddecl)
1541 || DECL_IN_SYSTEM_HEADER (newdecl))
1542 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1543 && TYPE_ARG_TYPES (oldtype) == 0
1544 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1545 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1547 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1548 && TYPE_ARG_TYPES (newtype) == 0
1549 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1550 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1553 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1554 /* Make sure we keep void * as ret type, not char *. */
1555 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1556 TREE_TYPE (newdecl) = newtype = oldtype;
1558 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1559 we will come back here again. */
1560 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1562 else if (!types_match
1563 /* Permit char *foo (int, ...); followed by char *foo ();
1565 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1567 /* Return types must still match. */
1568 && comptypes (TREE_TYPE (oldtype),
1569 TREE_TYPE (newtype))
1570 && TYPE_ARG_TYPES (newtype) == 0))
1572 error_with_decl (newdecl, "conflicting types for `%s'");
1573 /* Check for function type mismatch
1574 involving an empty arglist vs a nonempty one. */
1575 if (TREE_CODE (olddecl) == FUNCTION_DECL
1576 && comptypes (TREE_TYPE (oldtype),
1577 TREE_TYPE (newtype))
1578 && ((TYPE_ARG_TYPES (oldtype) == 0
1579 && DECL_INITIAL (olddecl) == 0)
1581 (TYPE_ARG_TYPES (newtype) == 0
1582 && DECL_INITIAL (newdecl) == 0)))
1584 /* Classify the problem further. */
1585 register tree t = TYPE_ARG_TYPES (oldtype);
1587 t = TYPE_ARG_TYPES (newtype);
1588 for (; t; t = TREE_CHAIN (t))
1590 register tree type = TREE_VALUE (t);
1592 if (TREE_CHAIN (t) == 0
1593 && TYPE_MAIN_VARIANT (type) != void_type_node)
1595 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1599 if (simple_type_promotes_to (type) != NULL_TREE)
1601 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1606 error_with_decl (olddecl, "previous declaration of `%s'");
1610 errmsg = redeclaration_error_message (newdecl, olddecl);
1616 error_with_decl (newdecl, "redefinition of `%s'");
1619 error_with_decl (newdecl, "redeclaration of `%s'");
1622 error_with_decl (newdecl, "conflicting declarations of `%s'");
1628 error_with_decl (olddecl,
1629 ((DECL_INITIAL (olddecl)
1630 && current_binding_level == global_binding_level)
1631 ? "`%s' previously defined here"
1632 : "`%s' previously declared here"));
1634 else if (TREE_CODE (newdecl) == TYPE_DECL
1635 && (DECL_IN_SYSTEM_HEADER (olddecl)
1636 || DECL_IN_SYSTEM_HEADER (newdecl)))
1638 warning_with_decl (newdecl, "redefinition of `%s'");
1641 ((DECL_INITIAL (olddecl)
1642 && current_binding_level == global_binding_level)
1643 ? "`%s' previously defined here"
1644 : "`%s' previously declared here"));
1646 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1647 && DECL_INITIAL (olddecl) != 0
1648 && TYPE_ARG_TYPES (oldtype) == 0
1649 && TYPE_ARG_TYPES (newtype) != 0
1650 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1652 register tree type, parm;
1654 /* Prototype decl follows defn w/o prototype. */
1656 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1657 type = TYPE_ARG_TYPES (newtype),
1660 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1662 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1663 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1665 warning_with_decl (newdecl, "prototype for `%s' follows");
1666 warning_with_decl (olddecl, "non-prototype definition here");
1669 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1670 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1672 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1673 error_with_decl (olddecl, "non-prototype definition here");
1677 /* Type for passing arg must be consistent
1678 with that declared for the arg. */
1679 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1680 /* If -traditional, allow `unsigned int' instead of `int'
1681 in the prototype. */
1682 && (! (flag_traditional
1683 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1684 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1686 error_with_decl (newdecl,
1687 "prototype for `%s' follows and argument %d doesn't match",
1689 error_with_decl (olddecl, "non-prototype definition here");
1695 /* Warn about mismatches in various flags. */
1698 /* Warn if function is now inline
1699 but was previously declared not inline and has been called. */
1700 if (TREE_CODE (olddecl) == FUNCTION_DECL
1701 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1702 && TREE_USED (olddecl))
1703 warning_with_decl (newdecl,
1704 "`%s' declared inline after being called");
1705 if (TREE_CODE (olddecl) == FUNCTION_DECL
1706 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1707 && DECL_INITIAL (olddecl) != 0)
1708 warning_with_decl (newdecl,
1709 "`%s' declared inline after its definition");
1711 /* If pedantic, warn when static declaration follows a non-static
1712 declaration. Otherwise, do so only for functions. */
1713 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1714 && TREE_PUBLIC (olddecl)
1715 && !TREE_PUBLIC (newdecl))
1716 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1718 /* If warn_traditional, warn when a non-static function
1719 declaration follows a static one. */
1720 if (warn_traditional
1721 && TREE_CODE (olddecl) == FUNCTION_DECL
1722 && !TREE_PUBLIC (olddecl)
1723 && TREE_PUBLIC (newdecl))
1724 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1726 /* Warn when const declaration follows a non-const
1727 declaration, but not for functions. */
1728 if (TREE_CODE (olddecl) != FUNCTION_DECL
1729 && !TREE_READONLY (olddecl)
1730 && TREE_READONLY (newdecl))
1731 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1732 /* These bits are logically part of the type, for variables.
1733 But not for functions
1734 (where qualifiers are not valid ANSI anyway). */
1735 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1736 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1737 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1738 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1742 /* Optionally warn about more than one declaration for the same name. */
1743 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1744 /* Don't warn about a function declaration
1745 followed by a definition. */
1746 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1747 && DECL_INITIAL (olddecl) == 0)
1748 /* Don't warn about extern decl followed by (tentative) definition. */
1749 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1751 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1752 warning_with_decl (olddecl, "previous declaration of `%s'");
1755 /* Copy all the DECL_... slots specified in the new decl
1756 except for any that we copy here from the old type.
1758 Past this point, we don't change OLDTYPE and NEWTYPE
1759 even if we change the types of NEWDECL and OLDDECL. */
1763 /* When copying info to olddecl, we store into write_olddecl
1764 instead. This allows us to avoid modifying olddecl when
1765 different_binding_level is true. */
1766 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1768 /* Merge the data types specified in the two decls. */
1769 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1771 if (different_binding_level)
1773 = build_type_attribute_variant
1775 merge_attributes (TYPE_ATTRIBUTES (newtype),
1776 TYPE_ATTRIBUTES (oldtype)));
1779 = TREE_TYPE (olddecl)
1780 = common_type (newtype, oldtype);
1783 /* Lay the type out, unless already done. */
1784 if (oldtype != TREE_TYPE (newdecl))
1786 if (TREE_TYPE (newdecl) != error_mark_node)
1787 layout_type (TREE_TYPE (newdecl));
1788 if (TREE_CODE (newdecl) != FUNCTION_DECL
1789 && TREE_CODE (newdecl) != TYPE_DECL
1790 && TREE_CODE (newdecl) != CONST_DECL)
1791 layout_decl (newdecl, 0);
1795 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1796 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1797 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1798 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1799 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1800 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1801 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1804 /* Keep the old rtl since we can safely use it. */
1805 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1807 /* Merge the type qualifiers. */
1808 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1809 && !TREE_THIS_VOLATILE (newdecl))
1810 TREE_THIS_VOLATILE (write_olddecl) = 0;
1811 if (TREE_READONLY (newdecl))
1812 TREE_READONLY (write_olddecl) = 1;
1813 if (TREE_THIS_VOLATILE (newdecl))
1815 TREE_THIS_VOLATILE (write_olddecl) = 1;
1816 if (TREE_CODE (newdecl) == VAR_DECL)
1817 make_var_volatile (newdecl);
1820 /* Keep source location of definition rather than declaration. */
1821 /* When called with different_binding_level set, keep the old
1822 information so that meaningful diagnostics can be given. */
1823 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1824 && ! different_binding_level)
1826 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1827 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1830 /* Merge the unused-warning information. */
1831 if (DECL_IN_SYSTEM_HEADER (olddecl))
1832 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1833 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1834 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1836 /* Merge the initialization information. */
1837 /* When called with different_binding_level set, don't copy over
1838 DECL_INITIAL, so that we don't accidentally change function
1839 declarations into function definitions. */
1840 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1841 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1843 /* Merge the section attribute.
1844 We want to issue an error if the sections conflict but that must be
1845 done later in decl_attributes since we are called before attributes
1847 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1848 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1850 /* Copy the assembler name.
1851 Currently, it can only be defined in the prototype. */
1852 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1854 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1856 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1857 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1859 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1860 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1861 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1862 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1863 DECL_NO_LIMIT_STACK (newdecl)
1864 |= DECL_NO_LIMIT_STACK (olddecl);
1867 /* If cannot merge, then use the new type and qualifiers,
1868 and don't preserve the old rtl. */
1869 else if (! different_binding_level)
1871 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1872 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1873 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1874 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1877 /* Merge the storage class information. */
1878 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1879 /* For functions, static overrides non-static. */
1880 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1882 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1883 /* This is since we don't automatically
1884 copy the attributes of NEWDECL into OLDDECL. */
1885 /* No need to worry about different_binding_level here because
1886 then TREE_PUBLIC (newdecl) was true. */
1887 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1888 /* If this clears `static', clear it in the identifier too. */
1889 if (! TREE_PUBLIC (olddecl))
1890 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1892 if (DECL_EXTERNAL (newdecl))
1894 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1895 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1896 /* An extern decl does not override previous storage class. */
1897 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1898 if (! DECL_EXTERNAL (newdecl))
1899 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1903 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1904 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1907 /* If either decl says `inline', this fn is inline,
1908 unless its definition was passed already. */
1909 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1910 DECL_INLINE (olddecl) = 1;
1911 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1913 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1915 if (DECL_BUILT_IN (olddecl))
1917 /* Get rid of any built-in function if new arg types don't match it
1918 or if we have a function definition. */
1919 if (! types_match || new_is_definition)
1921 if (! different_binding_level)
1923 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1924 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1929 /* If redeclaring a builtin function, and not a definition,
1930 it stays built in. */
1931 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1932 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1935 /* Also preserve various other info from the definition. */
1936 else if (! new_is_definition)
1937 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1938 if (! new_is_definition)
1940 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1941 /* When called with different_binding_level set, don't copy over
1942 DECL_INITIAL, so that we don't accidentally change function
1943 declarations into function definitions. */
1944 if (! different_binding_level)
1945 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1946 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1947 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1948 if (DECL_INLINE (newdecl))
1949 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
1952 if (different_binding_level)
1954 /* Don't output a duplicate symbol or debugging information for this
1957 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1958 just have two declarations without a definition. VAR_DECLs may need
1959 the same treatment, I'm not sure. */
1960 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1961 DECL_IGNORED_P (newdecl) = 1;
1963 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1967 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1968 But preserve OLDDECL's DECL_UID. */
1970 register unsigned olddecl_uid = DECL_UID (olddecl);
1972 bcopy ((char *) newdecl + sizeof (struct tree_common),
1973 (char *) olddecl + sizeof (struct tree_common),
1974 sizeof (struct tree_decl) - sizeof (struct tree_common));
1975 DECL_UID (olddecl) = olddecl_uid;
1978 /* NEWDECL contains the merged attribute lists.
1979 Update OLDDECL to be the same. */
1980 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
1985 /* Record a decl-node X as belonging to the current lexical scope.
1986 Check for errors (such as an incompatible declaration for the same
1987 name already seen in the same scope).
1989 Returns either X or an old decl for the same name.
1990 If an old decl is returned, it may have been smashed
1991 to agree with what X says. */
1998 register tree name = DECL_NAME (x);
1999 register struct binding_level *b = current_binding_level;
2001 DECL_CONTEXT (x) = current_function_decl;
2002 /* A local extern declaration for a function doesn't constitute nesting.
2003 A local auto declaration does, since it's a forward decl
2004 for a nested function coming later. */
2005 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2006 && DECL_EXTERNAL (x))
2007 DECL_CONTEXT (x) = 0;
2009 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2010 && x != IDENTIFIER_IMPLICIT_DECL (name)
2011 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2012 && !DECL_IN_SYSTEM_HEADER (x))
2013 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2019 int different_binding_level = 0;
2021 t = lookup_name_current_level (name);
2022 /* Don't type check externs here when -traditional. This is so that
2023 code with conflicting declarations inside blocks will get warnings
2024 not errors. X11 for instance depends on this. */
2025 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2027 t = IDENTIFIER_GLOBAL_VALUE (name);
2028 /* Type decls at global scope don't conflict with externs declared
2029 inside lexical blocks. */
2030 if (t && TREE_CODE (t) == TYPE_DECL)
2032 different_binding_level = 1;
2034 if (t != 0 && t == error_mark_node)
2035 /* error_mark_node is 0 for a while during initialization! */
2038 error_with_decl (x, "`%s' used prior to declaration");
2043 file = DECL_SOURCE_FILE (t);
2044 line = DECL_SOURCE_LINE (t);
2047 /* If this decl is `static' and an implicit decl was seen previously,
2048 warn. But don't complain if -traditional,
2049 since traditional compilers don't complain. */
2050 if (! flag_traditional && TREE_PUBLIC (name)
2051 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2052 sets this for all functions. */
2053 && ! TREE_PUBLIC (x)
2054 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2055 /* We used to warn also for explicit extern followed by static,
2056 but sometimes you need to do it that way. */
2057 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2059 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2060 IDENTIFIER_POINTER (name));
2061 pedwarn_with_file_and_line
2062 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2063 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2064 "previous declaration of `%s'",
2065 IDENTIFIER_POINTER (name));
2066 TREE_THIS_VOLATILE (name) = 1;
2069 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2071 if (TREE_CODE (t) == PARM_DECL)
2073 /* Don't allow more than one "real" duplicate
2074 of a forward parm decl. */
2075 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2081 /* If we are processing a typedef statement, generate a whole new
2082 ..._TYPE node (which will be just an variant of the existing
2083 ..._TYPE node with identical properties) and then install the
2084 TYPE_DECL node generated to represent the typedef name as the
2085 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2087 The whole point here is to end up with a situation where each
2088 and every ..._TYPE node the compiler creates will be uniquely
2089 associated with AT MOST one node representing a typedef name.
2090 This way, even though the compiler substitutes corresponding
2091 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2092 early on, later parts of the compiler can always do the reverse
2093 translation and get back the corresponding typedef name. For
2096 typedef struct S MY_TYPE;
2099 Later parts of the compiler might only know that `object' was of
2100 type `struct S' if it were not for code just below. With this
2101 code however, later parts of the compiler see something like:
2103 struct S' == struct S
2104 typedef struct S' MY_TYPE;
2107 And they can then deduce (from the node for type struct S') that
2108 the original object declaration was:
2112 Being able to do this is important for proper support of protoize,
2113 and also for generating precise symbolic debugging information
2114 which takes full account of the programmer's (typedef) vocabulary.
2116 Obviously, we don't want to generate a duplicate ..._TYPE node if
2117 the TYPE_DECL node that we are now processing really represents a
2118 standard built-in type.
2120 Since all standard types are effectively declared at line zero
2121 in the source file, we can easily check to see if we are working
2122 on a standard type by checking the current value of lineno. */
2124 if (TREE_CODE (x) == TYPE_DECL)
2126 if (DECL_SOURCE_LINE (x) == 0)
2128 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2129 TYPE_NAME (TREE_TYPE (x)) = x;
2131 else if (TREE_TYPE (x) != error_mark_node
2132 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2134 tree tt = TREE_TYPE (x);
2135 DECL_ORIGINAL_TYPE (x) = tt;
2136 tt = build_type_copy (tt);
2142 /* Multiple external decls of the same identifier ought to match.
2143 Check against both global declarations (when traditional) and out of
2144 scope (limbo) block level declarations.
2146 We get warnings about inline functions where they are defined.
2147 Avoid duplicate warnings where they are used. */
2148 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2152 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2153 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2154 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2155 decl = IDENTIFIER_GLOBAL_VALUE (name);
2156 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2157 /* Decls in limbo are always extern, so no need to check that. */
2158 decl = IDENTIFIER_LIMBO_VALUE (name);
2162 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2163 /* If old decl is built-in, we already warned if we should. */
2164 && !DECL_BUILT_IN (decl))
2166 pedwarn_with_decl (x,
2167 "type mismatch with previous external decl");
2168 pedwarn_with_decl (decl, "previous external decl of `%s'");
2172 /* If a function has had an implicit declaration, and then is defined,
2173 make sure they are compatible. */
2175 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2176 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2177 && TREE_CODE (x) == FUNCTION_DECL
2178 && ! comptypes (TREE_TYPE (x),
2179 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2181 warning_with_decl (x, "type mismatch with previous implicit declaration");
2182 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2183 "previous implicit declaration of `%s'");
2186 /* In PCC-compatibility mode, extern decls of vars with no current decl
2187 take effect at top level no matter where they are. */
2188 if (flag_traditional && DECL_EXTERNAL (x)
2189 && lookup_name (name) == 0)
2191 tree type = TREE_TYPE (x);
2193 /* But don't do this if the type contains temporary nodes. */
2196 if (type == error_mark_node)
2198 if (! TYPE_CONTEXT (type))
2200 warning_with_decl (x, "type of external `%s' is not global");
2201 /* By exiting the loop early, we leave TYPE nonzero,
2202 and thus prevent globalization of the decl. */
2205 else if (TREE_CODE (type) == FUNCTION_TYPE
2206 && TYPE_ARG_TYPES (type) != 0)
2207 /* The types might not be truly local,
2208 but the list of arg types certainly is temporary.
2209 Since prototypes are nontraditional,
2210 ok not to do the traditional thing. */
2212 type = TREE_TYPE (type);
2216 b = global_binding_level;
2219 /* This name is new in its binding level.
2220 Install the new declaration and return it. */
2221 if (b == global_binding_level)
2223 /* Install a global value. */
2225 /* If the first global decl has external linkage,
2226 warn if we later see static one. */
2227 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2228 TREE_PUBLIC (name) = 1;
2230 IDENTIFIER_GLOBAL_VALUE (name) = x;
2232 /* We no longer care about any previous block level declarations. */
2233 IDENTIFIER_LIMBO_VALUE (name) = 0;
2235 /* Don't forget if the function was used via an implicit decl. */
2236 if (IDENTIFIER_IMPLICIT_DECL (name)
2237 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2238 TREE_USED (x) = 1, TREE_USED (name) = 1;
2240 /* Don't forget if its address was taken in that way. */
2241 if (IDENTIFIER_IMPLICIT_DECL (name)
2242 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2243 TREE_ADDRESSABLE (x) = 1;
2245 /* Warn about mismatches against previous implicit decl. */
2246 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2247 /* If this real decl matches the implicit, don't complain. */
2248 && ! (TREE_CODE (x) == FUNCTION_DECL
2249 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2250 == integer_type_node)))
2251 pedwarn ("`%s' was previously implicitly declared to return `int'",
2252 IDENTIFIER_POINTER (name));
2254 /* If this decl is `static' and an `extern' was seen previously,
2255 that is erroneous. */
2256 if (TREE_PUBLIC (name)
2257 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2259 /* Okay to redeclare an ANSI built-in as static. */
2260 if (t != 0 && DECL_BUILT_IN (t))
2262 /* Okay to declare a non-ANSI built-in as anything. */
2263 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2265 /* Okay to have global type decl after an earlier extern
2266 declaration inside a lexical block. */
2267 else if (TREE_CODE (x) == TYPE_DECL)
2269 else if (IDENTIFIER_IMPLICIT_DECL (name))
2271 if (! TREE_THIS_VOLATILE (name))
2272 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2273 IDENTIFIER_POINTER (name));
2276 pedwarn ("`%s' was declared `extern' and later `static'",
2277 IDENTIFIER_POINTER (name));
2282 /* Here to install a non-global value. */
2283 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2284 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2285 IDENTIFIER_LOCAL_VALUE (name) = x;
2287 /* If this is an extern function declaration, see if we
2288 have a global definition or declaration for the function. */
2290 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2292 && TREE_CODE (x) == FUNCTION_DECL
2293 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2295 /* We have one. Their types must agree. */
2296 if (! comptypes (TREE_TYPE (x),
2297 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2298 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2301 /* Inner extern decl is inline if global one is.
2302 Copy enough to really inline it. */
2303 if (DECL_INLINE (oldglobal))
2305 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2306 DECL_INITIAL (x) = (current_function_decl == oldglobal
2307 ? 0 : DECL_INITIAL (oldglobal));
2308 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2309 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2310 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2311 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2312 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2313 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2315 /* Inner extern decl is built-in if global one is. */
2316 if (DECL_BUILT_IN (oldglobal))
2318 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2319 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2321 /* Keep the arg types from a file-scope fcn defn. */
2322 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2323 && DECL_INITIAL (oldglobal)
2324 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2325 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2329 #if 0 /* This case is probably sometimes the right thing to do. */
2330 /* If we have a local external declaration,
2331 then any file-scope declaration should not
2332 have been static. */
2333 if (oldlocal == 0 && oldglobal != 0
2334 && !TREE_PUBLIC (oldglobal)
2335 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2336 warning ("`%s' locally external but globally static",
2337 IDENTIFIER_POINTER (name));
2340 /* If we have a local external declaration,
2341 and no file-scope declaration has yet been seen,
2342 then if we later have a file-scope decl it must not be static. */
2344 && DECL_EXTERNAL (x)
2348 TREE_PUBLIC (name) = 1;
2350 /* Save this decl, so that we can do type checking against
2351 other decls after it falls out of scope.
2353 Only save it once. This prevents temporary decls created in
2354 expand_inline_function from being used here, since this
2355 will have been set when the inline function was parsed.
2356 It also helps give slightly better warnings. */
2357 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2358 IDENTIFIER_LIMBO_VALUE (name) = x;
2361 /* Warn if shadowing an argument at the top level of the body. */
2362 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2363 /* This warning doesn't apply to the parms of a nested fcn. */
2364 && ! current_binding_level->parm_flag
2365 /* Check that this is one level down from the parms. */
2366 && current_binding_level->level_chain->parm_flag
2367 /* Check that the decl being shadowed
2368 comes from the parm level, one level up. */
2369 && chain_member (oldlocal, current_binding_level->level_chain->names))
2371 if (TREE_CODE (oldlocal) == PARM_DECL)
2372 pedwarn ("declaration of `%s' shadows a parameter",
2373 IDENTIFIER_POINTER (name));
2375 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2376 IDENTIFIER_POINTER (name));
2379 /* Maybe warn if shadowing something else. */
2380 else if (warn_shadow && !DECL_EXTERNAL (x)
2381 /* No shadow warnings for internally generated vars. */
2382 && DECL_SOURCE_LINE (x) != 0
2383 /* No shadow warnings for vars made for inlining. */
2384 && ! DECL_FROM_INLINE (x))
2386 char *id = IDENTIFIER_POINTER (name);
2388 if (TREE_CODE (x) == PARM_DECL
2389 && current_binding_level->level_chain->parm_flag)
2390 /* Don't warn about the parm names in function declarator
2391 within a function declarator.
2392 It would be nice to avoid warning in any function
2393 declarator in a declaration, as opposed to a definition,
2394 but there is no way to tell it's not a definition. */
2396 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2397 warning ("declaration of `%s' shadows a parameter", id);
2398 else if (oldlocal != 0)
2399 warning ("declaration of `%s' shadows previous local", id);
2400 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2401 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2402 warning ("declaration of `%s' shadows global declaration", id);
2405 /* If storing a local value, there may already be one (inherited).
2406 If so, record it for restoration when this binding level ends. */
2408 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2411 /* Keep count of variables in this level with incomplete type. */
2412 if (!COMPLETE_TYPE_P (TREE_TYPE (x)))
2416 /* Put decls on list in reverse order.
2417 We will reverse them later if necessary. */
2418 TREE_CHAIN (x) = b->names;
2424 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2427 pushdecl_top_level (x)
2431 register struct binding_level *b = current_binding_level;
2433 current_binding_level = global_binding_level;
2435 current_binding_level = b;
2439 /* Generate an implicit declaration for identifier FUNCTIONID
2440 as a function of type int (). Print a warning if appropriate. */
2443 implicitly_declare (functionid)
2447 int traditional_warning = 0;
2448 /* Only one "implicit declaration" warning per identifier. */
2449 int implicit_warning;
2451 /* We used to reuse an old implicit decl here,
2452 but this loses with inline functions because it can clobber
2453 the saved decl chains. */
2454 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2455 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2457 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2459 /* Warn of implicit decl following explicit local extern decl.
2460 This is probably a program designed for traditional C. */
2461 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2462 traditional_warning = 1;
2464 /* Warn once of an implicit declaration. */
2465 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2467 DECL_EXTERNAL (decl) = 1;
2468 TREE_PUBLIC (decl) = 1;
2470 /* Record that we have an implicit decl and this is it. */
2471 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2473 /* ANSI standard says implicit declarations are in the innermost block.
2474 So we record the decl in the standard fashion.
2475 If flag_traditional is set, pushdecl does it top-level. */
2478 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2479 maybe_objc_check_decl (decl);
2481 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2483 if (mesg_implicit_function_declaration && implicit_warning)
2485 if (mesg_implicit_function_declaration == 2)
2486 error ("implicit declaration of function `%s'",
2487 IDENTIFIER_POINTER (functionid));
2489 warning ("implicit declaration of function `%s'",
2490 IDENTIFIER_POINTER (functionid));
2492 else if (warn_traditional && traditional_warning)
2493 warning ("function `%s' was previously declared within a block",
2494 IDENTIFIER_POINTER (functionid));
2496 /* Write a record describing this implicit function declaration to the
2497 prototypes file (if requested). */
2499 gen_aux_info_record (decl, 0, 1, 0);
2504 /* Return zero if the declaration NEWDECL is valid
2505 when the declaration OLDDECL (assumed to be for the same name)
2506 has already been seen.
2507 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2508 and 3 if it is a conflicting declaration. */
2511 redeclaration_error_message (newdecl, olddecl)
2512 tree newdecl, olddecl;
2514 if (TREE_CODE (newdecl) == TYPE_DECL)
2516 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2518 /* pushdecl creates distinct types for TYPE_DECLs by calling
2519 build_type_copy, so the above comparison generally fails. We do
2520 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2521 is equivalent to what this code used to do before the build_type_copy
2522 call. The variant type distinction should not matter for traditional
2523 code, because it doesn't have type qualifiers. */
2524 if (flag_traditional
2525 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2527 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2531 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2533 /* Declarations of functions can insist on internal linkage
2534 but they can't be inconsistent with internal linkage,
2535 so there can be no error on that account.
2536 However defining the same name twice is no good. */
2537 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2538 /* However, defining once as extern inline and a second
2539 time in another way is ok. */
2540 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2541 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2545 else if (current_binding_level == global_binding_level)
2547 /* Objects declared at top level: */
2548 /* If at least one is a reference, it's ok. */
2549 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2551 /* Reject two definitions. */
2552 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2554 /* Now we have two tentative defs, or one tentative and one real def. */
2555 /* Insist that the linkage match. */
2556 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2560 else if (current_binding_level->parm_flag
2561 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2565 /* Newdecl has block scope. If olddecl has block scope also, then
2566 reject two definitions, and reject a definition together with an
2567 external reference. Otherwise, it is OK, because newdecl must
2568 be an extern reference to olddecl. */
2569 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2570 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2576 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2577 Create one if none exists so far for the current function.
2578 This function is called for both label definitions and label references. */
2584 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2586 if (current_function_decl == 0)
2588 error ("label %s referenced outside of any function",
2589 IDENTIFIER_POINTER (id));
2593 /* Use a label already defined or ref'd with this name. */
2596 /* But not if it is inherited and wasn't declared to be inheritable. */
2597 if (DECL_CONTEXT (decl) != current_function_decl
2598 && ! C_DECLARED_LABEL_FLAG (decl))
2599 return shadow_label (id);
2603 decl = build_decl (LABEL_DECL, id, void_type_node);
2605 /* Make sure every label has an rtx. */
2608 /* A label not explicitly declared must be local to where it's ref'd. */
2609 DECL_CONTEXT (decl) = current_function_decl;
2611 DECL_MODE (decl) = VOIDmode;
2613 /* Say where one reference is to the label,
2614 for the sake of the error if it is not defined. */
2615 DECL_SOURCE_LINE (decl) = lineno;
2616 DECL_SOURCE_FILE (decl) = input_filename;
2618 IDENTIFIER_LABEL_VALUE (id) = decl;
2620 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2625 /* Make a label named NAME in the current function,
2626 shadowing silently any that may be inherited from containing functions
2627 or containing scopes.
2629 Note that valid use, if the label being shadowed
2630 comes from another scope in the same function,
2631 requires calling declare_nonlocal_label right away. */
2637 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2643 /* Check to make sure that the label hasn't already been declared
2644 at this label scope */
2645 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2646 if (TREE_VALUE (dup) == decl)
2648 error ("duplicate label declaration `%s'",
2649 IDENTIFIER_POINTER (name));
2650 error_with_decl (TREE_VALUE (dup),
2651 "this is a previous declaration");
2652 /* Just use the previous declaration. */
2653 return lookup_label (name);
2656 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2657 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2660 return lookup_label (name);
2663 /* Define a label, specifying the location in the source file.
2664 Return the LABEL_DECL node for the label, if the definition is valid.
2665 Otherwise return 0. */
2668 define_label (filename, line, name)
2673 tree decl = lookup_label (name);
2675 /* If label with this name is known from an outer context, shadow it. */
2676 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2678 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2679 IDENTIFIER_LABEL_VALUE (name) = 0;
2680 decl = lookup_label (name);
2683 if (DECL_INITIAL (decl) != 0)
2685 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2690 /* Mark label as having been defined. */
2691 DECL_INITIAL (decl) = error_mark_node;
2692 /* Say where in the source. */
2693 DECL_SOURCE_FILE (decl) = filename;
2694 DECL_SOURCE_LINE (decl) = line;
2699 /* Return the list of declarations of the current level.
2700 Note that this list is in reverse order unless/until
2701 you nreverse it; and when you do nreverse it, you must
2702 store the result back using `storedecls' or you will lose. */
2707 return current_binding_level->names;
2710 /* Return the list of type-tags (for structs, etc) of the current level. */
2715 return current_binding_level->tags;
2718 /* Store the list of declarations of the current level.
2719 This is done for the parameter declarations of a function being defined,
2720 after they are modified in the light of any missing parameters. */
2726 current_binding_level->names = decls;
2729 /* Similarly, store the list of tags of the current level. */
2735 current_binding_level->tags = tags;
2738 /* Given NAME, an IDENTIFIER_NODE,
2739 return the structure (or union or enum) definition for that name.
2740 Searches binding levels from BINDING_LEVEL up to the global level.
2741 If THISLEVEL_ONLY is nonzero, searches only the specified context
2742 (but skips any tag-transparent contexts to find one that is
2743 meaningful for tags).
2744 CODE says which kind of type the caller wants;
2745 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2746 If the wrong kind of type is found, an error is reported. */
2749 lookup_tag (code, name, binding_level, thislevel_only)
2750 enum tree_code code;
2751 struct binding_level *binding_level;
2755 register struct binding_level *level;
2757 for (level = binding_level; level; level = level->level_chain)
2760 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2762 if (TREE_PURPOSE (tail) == name)
2764 if (TREE_CODE (TREE_VALUE (tail)) != code)
2766 /* Definition isn't the kind we were looking for. */
2767 pending_invalid_xref = name;
2768 pending_invalid_xref_file = input_filename;
2769 pending_invalid_xref_line = lineno;
2771 return TREE_VALUE (tail);
2774 if (thislevel_only && ! level->tag_transparent)
2780 /* Print an error message now
2781 for a recent invalid struct, union or enum cross reference.
2782 We don't print them immediately because they are not invalid
2783 when used in the `struct foo;' construct for shadowing. */
2786 pending_xref_error ()
2788 if (pending_invalid_xref != 0)
2789 error_with_file_and_line (pending_invalid_xref_file,
2790 pending_invalid_xref_line,
2791 "`%s' defined as wrong kind of tag",
2792 IDENTIFIER_POINTER (pending_invalid_xref));
2793 pending_invalid_xref = 0;
2796 /* Given a type, find the tag that was defined for it and return the tag name.
2797 Otherwise return 0. */
2800 lookup_tag_reverse (type)
2803 register struct binding_level *level;
2805 for (level = current_binding_level; level; level = level->level_chain)
2808 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2810 if (TREE_VALUE (tail) == type)
2811 return TREE_PURPOSE (tail);
2817 /* Look up NAME in the current binding level and its superiors
2818 in the namespace of variables, functions and typedefs.
2819 Return a ..._DECL node of some kind representing its definition,
2820 or return 0 if it is undefined. */
2827 if (current_binding_level != global_binding_level
2828 && IDENTIFIER_LOCAL_VALUE (name))
2829 val = IDENTIFIER_LOCAL_VALUE (name);
2831 val = IDENTIFIER_GLOBAL_VALUE (name);
2835 /* Similar to `lookup_name' but look only at current binding level. */
2838 lookup_name_current_level (name)
2843 if (current_binding_level == global_binding_level)
2844 return IDENTIFIER_GLOBAL_VALUE (name);
2846 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2849 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2850 if (DECL_NAME (t) == name)
2856 /* Mark ARG for GC. */
2858 mark_binding_level (arg)
2861 struct binding_level *level = *(struct binding_level **) arg;
2865 ggc_mark_tree (level->names);
2866 ggc_mark_tree (level->tags);
2867 ggc_mark_tree (level->shadowed);
2868 ggc_mark_tree (level->blocks);
2869 ggc_mark_tree (level->this_block);
2870 ggc_mark_tree (level->parm_order);
2871 level = level->level_chain;
2875 /* Create the predefined scalar types of C,
2876 and some nodes representing standard constants (0, 1, (void *) 0).
2877 Initialize the global binding level.
2878 Make definitions for built-in primitive functions. */
2881 init_decl_processing ()
2883 register tree endlink;
2884 tree ptr_ftype_void, ptr_ftype_ptr;
2885 int wchar_type_size;
2886 tree array_domain_type;
2889 current_function_decl = NULL;
2890 named_labels = NULL;
2891 current_binding_level = NULL_BINDING_LEVEL;
2892 free_binding_level = NULL_BINDING_LEVEL;
2893 pushlevel (0); /* make the binding_level structure for global names */
2894 global_binding_level = current_binding_level;
2896 build_common_tree_nodes (flag_signed_char);
2898 /* Define `int' and `char' first so that dbx will output them first. */
2899 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2900 integer_type_node));
2901 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2903 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2904 long_integer_type_node));
2905 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2906 unsigned_type_node));
2907 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2908 long_unsigned_type_node));
2909 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2910 long_long_integer_type_node));
2911 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2912 long_long_unsigned_type_node));
2913 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2914 short_integer_type_node));
2915 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2916 short_unsigned_type_node));
2917 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2918 signed_char_type_node));
2919 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2920 unsigned_char_type_node));
2921 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2922 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2923 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2924 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2925 #if HOST_BITS_PER_WIDE_INT >= 64
2926 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2928 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2929 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2930 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2931 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2932 #if HOST_BITS_PER_WIDE_INT >= 64
2933 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2936 /* `unsigned long' is the standard type for sizeof.
2937 Traditionally, use a signed type.
2938 Note that stddef.h uses `unsigned long',
2939 and this must agree, even if long and int are the same size. */
2940 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2941 if (flag_traditional && TREE_UNSIGNED (t))
2942 t = signed_type (t);
2946 /* Create the widest literal types. */
2947 widest_integer_literal_type_node
2948 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2949 widest_unsigned_literal_type_node
2950 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2951 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2952 widest_integer_literal_type_node));
2953 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2954 widest_unsigned_literal_type_node));
2956 build_common_tree_nodes_2 (flag_short_double);
2958 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2960 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2963 long_double_type_node));
2964 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2965 complex_integer_type_node));
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2967 complex_float_type_node));
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2969 complex_double_type_node));
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2971 complex_long_double_type_node));
2972 pushdecl (build_decl (TYPE_DECL,
2973 ridpointers[(int) RID_VOID], void_type_node));
2975 #ifdef MD_INIT_BUILTINS
2979 wchar_type_node = get_identifier (flag_short_wchar
2980 ? "short unsigned int"
2982 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
2983 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2984 signed_wchar_type_node = signed_type (wchar_type_node);
2985 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2987 boolean_type_node = integer_type_node;
2988 boolean_true_node = integer_one_node;
2989 boolean_false_node = integer_zero_node;
2991 string_type_node = build_pointer_type (char_type_node);
2992 const_string_type_node
2993 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2995 /* Make a type to be the domain of a few array types
2996 whose domains don't really matter.
2997 200 is small enough that it always fits in size_t
2998 and large enough that it can hold most function names for the
2999 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3000 array_domain_type = build_index_type (build_int_2 (200, 0));
3002 /* make a type for arrays of characters.
3003 With luck nothing will ever really depend on the length of this
3005 char_array_type_node
3006 = build_array_type (char_type_node, array_domain_type);
3007 /* Likewise for arrays of ints. */
3009 = build_array_type (integer_type_node, array_domain_type);
3010 /* This is for wide string constants. */
3011 wchar_array_type_node
3012 = build_array_type (wchar_type_node, array_domain_type);
3014 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3016 default_function_type
3017 = build_function_type (integer_type_node, NULL_TREE);
3019 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3021 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3023 endlink = void_list_node;
3024 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3026 = build_function_type (ptr_type_node,
3027 tree_cons (NULL_TREE, ptr_type_node, endlink));
3029 builtin_function ("__builtin_aggregate_incoming_address",
3030 build_function_type (ptr_type_node, NULL_TREE),
3031 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3032 BUILT_IN_NORMAL, NULL_PTR);
3034 /* Hooks for the DWARF 2 __throw routine. */
3035 builtin_function ("__builtin_unwind_init",
3036 build_function_type (void_type_node, endlink),
3037 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3038 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3039 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3040 builtin_function ("__builtin_dwarf_fp_regnum",
3041 build_function_type (unsigned_type_node, endlink),
3042 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3043 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3044 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3045 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3046 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3047 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3048 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3050 ("__builtin_eh_return",
3051 build_function_type (void_type_node,
3052 tree_cons (NULL_TREE, ptr_type_node,
3053 tree_cons (NULL_TREE,
3054 type_for_mode (ptr_mode, 0),
3055 tree_cons (NULL_TREE,
3058 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3060 pedantic_lvalues = pedantic;
3062 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3063 make_fname_decl = c_make_fname_decl;
3064 declare_function_name ();
3066 start_identifier_warnings ();
3068 /* Prepare to check format strings against argument lists. */
3069 init_function_format_info ();
3073 incomplete_decl_finalize_hook = finish_incomplete_decl;
3075 lang_get_alias_set = c_get_alias_set;
3077 /* Record our roots. */
3079 ggc_add_tree_root (c_global_trees, CTI_MAX);
3080 ggc_add_tree_root (&named_labels, 1);
3081 ggc_add_tree_root (&shadowed_labels, 1);
3082 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3083 mark_binding_level);
3084 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3085 mark_binding_level);
3086 ggc_add_tree_root (&static_ctors, 1);
3087 ggc_add_tree_root (&static_dtors, 1);
3090 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3091 decl, NAME is the initialization string and TYPE_DEP indicates whether
3092 NAME depended on the type of the function. As we don't yet implement
3093 delayed emission of static data, we mark the decl as emitted
3094 so it is not placed in the output. Anything using it must therefore pull
3095 out the STRING_CST initializer directly. This does mean that these names
3096 are string merging candidates, which C99 does not permit. */
3099 c_make_fname_decl (id, name, type_dep)
3102 int type_dep ATTRIBUTE_UNUSED;
3104 tree decl, type, init;
3105 size_t length = strlen (name);
3107 type = build_array_type
3108 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3109 build_index_type (build_int_2 (length, 0)));
3111 decl = build_decl (VAR_DECL, id, type);
3112 TREE_STATIC (decl) = 1;
3113 TREE_READONLY (decl) = 1;
3114 TREE_ASM_WRITTEN (decl) = 1;
3115 DECL_SOURCE_LINE (decl) = 0;
3116 DECL_ARTIFICIAL (decl) = 1;
3117 DECL_IN_SYSTEM_HEADER (decl) = 1;
3118 DECL_IGNORED_P (decl) = 1;
3119 init = build_string (length + 1, name);
3120 TREE_TYPE (init) = type;
3121 DECL_INITIAL (decl) = init;
3122 finish_decl (pushdecl (decl), init, NULL_TREE);
3127 /* Return a definition for a builtin function named NAME and whose data type
3128 is TYPE. TYPE should be a function type with argument types.
3129 FUNCTION_CODE tells later passes how to compile calls to this function.
3130 See tree.h for its possible values.
3132 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3133 the name to be called if we can't opencode the function. */
3136 builtin_function (name, type, function_code, class, library_name)
3140 enum built_in_class class;
3141 const char *library_name;
3143 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3144 DECL_EXTERNAL (decl) = 1;
3145 TREE_PUBLIC (decl) = 1;
3146 /* If -traditional, permit redefining a builtin function any way you like.
3147 (Though really, if the program redefines these functions,
3148 it probably won't work right unless compiled with -fno-builtin.) */
3149 if (flag_traditional && name[0] != '_')
3150 DECL_BUILT_IN_NONANSI (decl) = 1;
3152 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3153 make_decl_rtl (decl, NULL_PTR, 1);
3155 DECL_BUILT_IN_CLASS (decl) = class;
3156 DECL_FUNCTION_CODE (decl) = function_code;
3158 /* Warn if a function in the namespace for users
3159 is used without an occasion to consider it declared. */
3160 if (name[0] != '_' || name[1] != '_')
3161 C_DECL_ANTICIPATED (decl) = 1;
3166 /* Called when a declaration is seen that contains no names to declare.
3167 If its type is a reference to a structure, union or enum inherited
3168 from a containing scope, shadow that tag name for the current scope
3169 with a forward reference.
3170 If its type defines a new named structure or union
3171 or defines an enum, it is valid but we need not do anything here.
3172 Otherwise, it is an error. */
3175 shadow_tag (declspecs)
3178 shadow_tag_warned (declspecs, 0);
3182 shadow_tag_warned (declspecs, warned)
3185 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3192 pending_invalid_xref = 0;
3194 /* Remove the attributes from declspecs, since they will confuse the
3196 split_specs_attrs (declspecs, &specs, &attrs);
3198 for (link = specs; link; link = TREE_CHAIN (link))
3200 register tree value = TREE_VALUE (link);
3201 register enum tree_code code = TREE_CODE (value);
3203 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3204 /* Used to test also that TYPE_SIZE (value) != 0.
3205 That caused warning for `struct foo;' at top level in the file. */
3207 register tree name = lookup_tag_reverse (value);
3214 if (warned != 1 && code != ENUMERAL_TYPE)
3215 /* Empty unnamed enum OK */
3217 pedwarn ("unnamed struct/union that defines no instances");
3223 t = lookup_tag (code, name, current_binding_level, 1);
3227 t = make_node (code);
3234 if (!warned && ! in_system_header)
3236 warning ("useless keyword or type name in empty declaration");
3243 error ("two types specified in one empty declaration");
3248 pedwarn ("empty declaration");
3252 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3255 groktypename (typename)
3258 if (TREE_CODE (typename) != TREE_LIST)
3260 return grokdeclarator (TREE_VALUE (typename),
3261 TREE_PURPOSE (typename),
3265 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3268 groktypename_in_parm_context (typename)
3271 if (TREE_CODE (typename) != TREE_LIST)
3273 return grokdeclarator (TREE_VALUE (typename),
3274 TREE_PURPOSE (typename),
3278 /* Decode a declarator in an ordinary declaration or data definition.
3279 This is called as soon as the type information and variable name
3280 have been parsed, before parsing the initializer if any.
3281 Here we create the ..._DECL node, fill in its type,
3282 and put it on the list of decls for the current context.
3283 The ..._DECL node is returned as the value.
3285 Exception: for arrays where the length is not specified,
3286 the type is left null, to be filled in by `finish_decl'.
3288 Function definitions do not come here; they go to start_function
3289 instead. However, external and forward declarations of functions
3290 do go through here. Structure field declarations are done by
3291 grokfield and not through here. */
3294 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3295 tree declarator, declspecs;
3297 tree attributes, prefix_attributes;
3299 register tree decl = grokdeclarator (declarator, declspecs,
3300 NORMAL, initialized);
3303 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3304 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3305 warning_with_decl (decl, "`%s' is usually a function");
3308 /* Is it valid for this decl to have an initializer at all?
3309 If not, set INITIALIZED to zero, which will indirectly
3310 tell `finish_decl' to ignore the initializer once it is parsed. */
3311 switch (TREE_CODE (decl))
3314 /* typedef foo = bar means give foo the same type as bar.
3315 We haven't parsed bar yet, so `finish_decl' will fix that up.
3316 Any other case of an initialization in a TYPE_DECL is an error. */
3317 if (pedantic || list_length (declspecs) > 1)
3319 error ("typedef `%s' is initialized",
3320 IDENTIFIER_POINTER (DECL_NAME (decl)));
3326 error ("function `%s' is initialized like a variable",
3327 IDENTIFIER_POINTER (DECL_NAME (decl)));
3332 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3333 error ("parameter `%s' is initialized",
3334 IDENTIFIER_POINTER (DECL_NAME (decl)));
3339 /* Don't allow initializations for incomplete types
3340 except for arrays which might be completed by the initialization. */
3341 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3343 /* A complete type is ok if size is fixed. */
3345 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3346 || C_DECL_VARIABLE_SIZE (decl))
3348 error ("variable-sized object may not be initialized");
3352 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3354 error ("variable `%s' has initializer but incomplete type",
3355 IDENTIFIER_POINTER (DECL_NAME (decl)));
3358 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3360 error ("elements of array `%s' have incomplete type",
3361 IDENTIFIER_POINTER (DECL_NAME (decl)));
3368 #if 0 /* Seems redundant with grokdeclarator. */
3369 if (current_binding_level != global_binding_level
3370 && DECL_EXTERNAL (decl)
3371 && TREE_CODE (decl) != FUNCTION_DECL)
3372 warning ("declaration of `%s' has `extern' and is initialized",
3373 IDENTIFIER_POINTER (DECL_NAME (decl)));
3375 DECL_EXTERNAL (decl) = 0;
3376 if (current_binding_level == global_binding_level)
3377 TREE_STATIC (decl) = 1;
3379 /* Tell `pushdecl' this is an initialized decl
3380 even though we don't yet have the initializer expression.
3381 Also tell `finish_decl' it may store the real initializer. */
3382 DECL_INITIAL (decl) = error_mark_node;
3385 /* If this is a function declaration, write a record describing it to the
3386 prototypes file (if requested). */
3388 if (TREE_CODE (decl) == FUNCTION_DECL)
3389 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3391 /* ANSI specifies that a tentative definition which is not merged with
3392 a non-tentative definition behaves exactly like a definition with an
3393 initializer equal to zero. (Section 3.7.2)
3394 -fno-common gives strict ANSI behavior. Usually you don't want it.
3395 This matters only for variables with external linkage. */
3396 if (! flag_no_common || ! TREE_PUBLIC (decl))
3397 DECL_COMMON (decl) = 1;
3399 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3400 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3403 /* Set attributes here so if duplicate decl, will have proper attributes. */
3404 decl_attributes (decl, attributes, prefix_attributes);
3406 /* Add this decl to the current binding level.
3407 TEM may equal DECL or it may be a previous decl of the same name. */
3408 tem = pushdecl (decl);
3410 /* For a local variable, define the RTL now. */
3411 if (current_binding_level != global_binding_level
3412 /* But not if this is a duplicate decl
3413 and we preserved the rtl from the previous one
3414 (which may or may not happen). */
3415 && DECL_RTL (tem) == 0)
3417 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3419 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3420 && DECL_INITIAL (tem) != 0)
3427 /* Finish processing of a declaration;
3428 install its initial value.
3429 If the length of an array type is not known before,
3430 it must be determined now, from the initial value, or it is an error. */
3433 finish_decl (decl, init, asmspec_tree)
3437 register tree type = TREE_TYPE (decl);
3438 int was_incomplete = (DECL_SIZE (decl) == 0);
3441 /* If a name was specified, get the string. */
3443 asmspec = TREE_STRING_POINTER (asmspec_tree);
3445 /* If `start_decl' didn't like having an initialization, ignore it now. */
3447 if (init != 0 && DECL_INITIAL (decl) == 0)
3449 /* Don't crash if parm is initialized. */
3450 if (TREE_CODE (decl) == PARM_DECL)
3453 if (ITERATOR_P (decl))
3456 error_with_decl (decl, "iterator has no initial value");
3458 init = save_expr (init);
3463 if (TREE_CODE (decl) != TYPE_DECL)
3464 store_init_value (decl, init);
3467 /* typedef foo = bar; store the type of bar as the type of foo. */
3468 TREE_TYPE (decl) = TREE_TYPE (init);
3469 DECL_INITIAL (decl) = init = 0;
3473 /* Deduce size of array from initialization, if not already known */
3475 if (TREE_CODE (type) == ARRAY_TYPE
3476 && TYPE_DOMAIN (type) == 0
3477 && TREE_CODE (decl) != TYPE_DECL)
3480 = (TREE_STATIC (decl)
3481 /* Even if pedantic, an external linkage array
3482 may have incomplete type at first. */
3483 ? pedantic && !TREE_PUBLIC (decl)
3484 : !DECL_EXTERNAL (decl));
3486 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3488 /* Get the completed type made by complete_array_type. */
3489 type = TREE_TYPE (decl);
3492 error_with_decl (decl, "initializer fails to determine size of `%s'");
3497 error_with_decl (decl, "array size missing in `%s'");
3498 /* If a `static' var's size isn't known,
3499 make it extern as well as static, so it does not get
3501 If it is not `static', then do not mark extern;
3502 finish_incomplete_decl will give it a default size
3503 and it will get allocated. */
3504 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3505 DECL_EXTERNAL (decl) = 1;
3508 /* TYPE_MAX_VALUE is always one less than the number of elements
3509 in the array, because we start counting at zero. Therefore,
3510 warn only if the value is less than zero. */
3511 if (pedantic && TYPE_DOMAIN (type) != 0
3512 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3513 error_with_decl (decl, "zero or negative size array `%s'");
3515 layout_decl (decl, 0);
3518 if (TREE_CODE (decl) == VAR_DECL)
3520 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3521 layout_decl (decl, 0);
3523 if (DECL_SIZE (decl) == 0
3524 && (TREE_STATIC (decl)
3526 /* A static variable with an incomplete type
3527 is an error if it is initialized.
3528 Also if it is not file scope.
3529 Otherwise, let it through, but if it is not `extern'
3530 then it may cause an error message later. */
3531 /* A duplicate_decls call could have changed an extern
3532 declaration into a file scope one. This can be detected
3533 by TREE_ASM_WRITTEN being set. */
3534 (DECL_INITIAL (decl) != 0
3535 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3537 /* An automatic variable with an incomplete type
3539 !DECL_EXTERNAL (decl)))
3541 error_with_decl (decl, "storage size of `%s' isn't known");
3542 TREE_TYPE (decl) = error_mark_node;
3545 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3546 && DECL_SIZE (decl) != 0)
3548 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3549 constant_expression_warning (DECL_SIZE (decl));
3551 error_with_decl (decl, "storage size of `%s' isn't constant");
3554 if (TREE_USED (type))
3555 TREE_USED (decl) = 1;
3558 /* If this is a function and an assembler name is specified, it isn't
3559 builtin any more. Also reset DECL_RTL so we can give it its new
3561 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3563 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3564 DECL_RTL (decl) = 0;
3565 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3568 /* Output the assembler code and/or RTL code for variables and functions,
3569 unless the type is an undefined structure or union.
3570 If not, it will get done when the type is completed. */
3572 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3574 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3575 maybe_objc_check_decl (decl);
3576 rest_of_decl_compilation (decl, asmspec,
3577 (DECL_CONTEXT (decl) == 0
3578 || TREE_ASM_WRITTEN (decl)), 0);
3580 if (DECL_CONTEXT (decl) != 0)
3582 /* Recompute the RTL of a local array now
3583 if it used to be an incomplete type. */
3585 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3587 /* If we used it already as memory, it must stay in memory. */
3588 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3589 /* If it's still incomplete now, no init will save it. */
3590 if (DECL_SIZE (decl) == 0)
3591 DECL_INITIAL (decl) = 0;
3594 /* Compute and store the initial value. */
3595 if (TREE_CODE (decl) != FUNCTION_DECL)
3596 expand_decl_init (decl);
3600 if (TREE_CODE (decl) == TYPE_DECL)
3602 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3603 maybe_objc_check_decl (decl);
3604 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3607 /* At the end of a declaration, throw away any variable type sizes
3608 of types defined inside that declaration. There is no use
3609 computing them in the following function definition. */
3610 if (current_binding_level == global_binding_level)
3611 get_pending_sizes ();
3614 /* If DECL has a cleanup, build and return that cleanup here.
3615 This is a callback called by expand_expr. */
3618 maybe_build_cleanup (decl)
3619 tree decl ATTRIBUTE_UNUSED;
3621 /* There are no cleanups in C. */
3625 /* Given a parsed parameter declaration,
3626 decode it into a PARM_DECL and push that on the current binding level.
3627 Also, for the sake of forward parm decls,
3628 record the given order of parms in `parm_order'. */
3631 push_parm_decl (parm)
3635 int old_immediate_size_expand = immediate_size_expand;
3636 /* Don't try computing parm sizes now -- wait till fn is called. */
3637 immediate_size_expand = 0;
3639 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3640 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3641 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3642 TREE_PURPOSE (TREE_VALUE (parm)));
3645 if (DECL_NAME (decl))
3648 olddecl = lookup_name (DECL_NAME (decl));
3649 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3650 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3654 decl = pushdecl (decl);
3656 immediate_size_expand = old_immediate_size_expand;
3658 current_binding_level->parm_order
3659 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3661 /* Add this decl to the current binding level. */
3662 finish_decl (decl, NULL_TREE, NULL_TREE);
3665 /* Clear the given order of parms in `parm_order'.
3666 Used at start of parm list,
3667 and also at semicolon terminating forward decls. */
3672 current_binding_level->parm_order = NULL_TREE;
3675 /* Make TYPE a complete type based on INITIAL_VALUE.
3676 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3677 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3680 complete_array_type (type, initial_value, do_default)
3685 register tree maxindex = NULL_TREE;
3690 /* Note MAXINDEX is really the maximum index,
3691 one less than the size. */
3692 if (TREE_CODE (initial_value) == STRING_CST)
3695 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3696 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3699 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3701 tree elts = CONSTRUCTOR_ELTS (initial_value);
3702 maxindex = build_int_2 (-1, -1);
3703 for (; elts; elts = TREE_CHAIN (elts))
3705 if (TREE_PURPOSE (elts))
3706 maxindex = TREE_PURPOSE (elts);
3708 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3709 maxindex, integer_one_node));
3711 maxindex = copy_node (maxindex);
3715 /* Make an error message unless that happened already. */
3716 if (initial_value != error_mark_node)
3719 /* Prevent further error messages. */
3720 maxindex = build_int_2 (0, 0);
3727 maxindex = build_int_2 (0, 0);
3733 TYPE_DOMAIN (type) = build_index_type (maxindex);
3734 if (!TREE_TYPE (maxindex))
3735 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3738 /* Lay out the type now that we can get the real answer. */
3745 /* Given declspecs and a declarator,
3746 determine the name and type of the object declared
3747 and construct a ..._DECL node for it.
3748 (In one case we can return a ..._TYPE node instead.
3749 For invalid input we sometimes return 0.)
3751 DECLSPECS is a chain of tree_list nodes whose value fields
3752 are the storage classes and type specifiers.
3754 DECL_CONTEXT says which syntactic context this declaration is in:
3755 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3756 FUNCDEF for a function definition. Like NORMAL but a few different
3757 error messages in each case. Return value may be zero meaning
3758 this definition is too screwy to try to parse.
3759 PARM for a parameter declaration (either within a function prototype
3760 or before a function body). Make a PARM_DECL, or return void_type_node.
3761 TYPENAME if for a typename (in a cast or sizeof).
3762 Don't make a DECL node; just return the ..._TYPE node.
3763 FIELD for a struct or union field; make a FIELD_DECL.
3764 BITFIELD for a field with specified width.
3765 INITIALIZED is 1 if the decl has an initializer.
3767 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3768 It may also be so in the PARM case, for a prototype where the
3769 argument type is specified but not the name.
3771 This function is where the complicated C meanings of `static'
3772 and `extern' are interpreted. */
3775 grokdeclarator (declarator, declspecs, decl_context, initialized)
3778 enum decl_context decl_context;
3783 tree type = NULL_TREE;
3788 int type_quals = TYPE_UNQUALIFIED;
3790 int explicit_int = 0;
3791 int explicit_char = 0;
3792 int defaulted_int = 0;
3793 tree typedef_decl = 0;
3795 tree typedef_type = 0;
3796 int funcdef_flag = 0;
3797 enum tree_code innermost_code = ERROR_MARK;
3799 int size_varies = 0;
3800 tree decl_machine_attr = NULL_TREE;
3802 if (decl_context == BITFIELD)
3803 bitfield = 1, decl_context = FIELD;
3805 if (decl_context == FUNCDEF)
3806 funcdef_flag = 1, decl_context = NORMAL;
3808 /* Look inside a declarator for the name being declared
3809 and get it as a string, for an error message. */
3811 register tree decl = declarator;
3815 switch (TREE_CODE (decl))
3820 innermost_code = TREE_CODE (decl);
3821 decl = TREE_OPERAND (decl, 0);
3824 case IDENTIFIER_NODE:
3825 name = IDENTIFIER_POINTER (decl);
3836 /* A function definition's declarator must have the form of
3837 a function declarator. */
3839 if (funcdef_flag && innermost_code != CALL_EXPR)
3842 /* Anything declared one level down from the top level
3843 must be one of the parameters of a function
3844 (because the body is at least two levels down). */
3846 /* If this looks like a function definition, make it one,
3847 even if it occurs where parms are expected.
3848 Then store_parm_decls will reject it and not use it as a parm. */
3849 if (decl_context == NORMAL && !funcdef_flag
3850 && current_binding_level->parm_flag)
3851 decl_context = PARM;
3853 /* Look through the decl specs and record which ones appear.
3854 Some typespecs are defined as built-in typenames.
3855 Others, the ones that are modifiers of other types,
3856 are represented by bits in SPECBITS: set the bits for
3857 the modifiers that appear. Storage class keywords are also in SPECBITS.
3859 If there is a typedef name or a type, store the type in TYPE.
3860 This includes builtin typedefs such as `int'.
3862 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3863 and did not come from a user typedef.
3865 Set LONGLONG if `long' is mentioned twice. */
3867 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3870 register tree id = TREE_VALUE (spec);
3872 if (id == ridpointers[(int) RID_INT])
3874 if (id == ridpointers[(int) RID_CHAR])
3877 if (TREE_CODE (id) == IDENTIFIER_NODE)
3878 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3880 if (ridpointers[i] == id)
3882 if (i == (int) RID_LONG && specbits & (1<<i))
3885 error ("`long long long' is too long for GCC");
3888 if (pedantic && ! in_system_header && warn_long_long)
3889 pedwarn ("ANSI C does not support `long long'");
3893 else if (specbits & (1 << i))
3894 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3900 error ("two or more data types in declaration of `%s'", name);
3901 /* Actual typedefs come to us as TYPE_DECL nodes. */
3902 else if (TREE_CODE (id) == TYPE_DECL)
3904 type = TREE_TYPE (id);
3905 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3908 /* Built-in types come as identifiers. */
3909 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3911 register tree t = lookup_name (id);
3912 if (TREE_TYPE (t) == error_mark_node)
3914 else if (!t || TREE_CODE (t) != TYPE_DECL)
3915 error ("`%s' fails to be a typedef or built in type",
3916 IDENTIFIER_POINTER (id));
3919 type = TREE_TYPE (t);
3923 else if (TREE_CODE (id) != ERROR_MARK)
3929 typedef_type = type;
3931 size_varies = C_TYPE_VARIABLE_SIZE (type);
3933 /* No type at all: default to `int', and set DEFAULTED_INT
3934 because it was not a user-defined typedef. */
3938 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3939 | (1 << (int) RID_SIGNED)
3940 | (1 << (int) RID_UNSIGNED))))
3941 /* Don't warn about typedef foo = bar. */
3942 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3943 && ! in_system_header)
3945 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3946 and this is a function, or if -Wimplicit; prefer the former
3947 warning since it is more explicit. */
3948 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
3949 warn_about_return_type = 1;
3950 else if (warn_implicit_int || flag_isoc99)
3951 warning ("type defaults to `int' in declaration of `%s'", name);
3955 type = integer_type_node;
3958 /* Now process the modifiers that were specified
3959 and check for invalid combinations. */
3961 /* Long double is a special combination. */
3963 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3964 && TYPE_MAIN_VARIANT (type) == double_type_node)
3966 specbits &= ~ (1 << (int) RID_LONG);
3967 type = long_double_type_node;
3970 /* Check all other uses of type modifiers. */
3972 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3973 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3977 if ((specbits & 1 << (int) RID_LONG)
3978 && (specbits & 1 << (int) RID_SHORT))
3979 error ("both long and short specified for `%s'", name);
3980 else if (((specbits & 1 << (int) RID_LONG)
3981 || (specbits & 1 << (int) RID_SHORT))
3983 error ("long or short specified with char for `%s'", name);
3984 else if (((specbits & 1 << (int) RID_LONG)
3985 || (specbits & 1 << (int) RID_SHORT))
3986 && TREE_CODE (type) == REAL_TYPE)
3988 static int already = 0;
3990 error ("long or short specified with floating type for `%s'", name);
3991 if (! already && ! pedantic)
3993 error ("the only valid combination is `long double'");
3997 else if ((specbits & 1 << (int) RID_SIGNED)
3998 && (specbits & 1 << (int) RID_UNSIGNED))
3999 error ("both signed and unsigned specified for `%s'", name);
4000 else if (TREE_CODE (type) != INTEGER_TYPE)
4001 error ("long, short, signed or unsigned invalid for `%s'", name);
4005 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4007 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4009 if (flag_pedantic_errors)
4014 /* Discard the type modifiers if they are invalid. */
4017 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4018 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4023 if ((specbits & (1 << (int) RID_COMPLEX))
4024 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4026 error ("complex invalid for `%s'", name);
4027 specbits &= ~ (1 << (int) RID_COMPLEX);
4030 /* Decide whether an integer type is signed or not.
4031 Optionally treat bitfields as signed by default. */
4032 if (specbits & 1 << (int) RID_UNSIGNED
4033 /* Traditionally, all bitfields are unsigned. */
4034 || (bitfield && flag_traditional
4035 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4036 || (bitfield && ! flag_signed_bitfields
4037 && (explicit_int || defaulted_int || explicit_char
4038 /* A typedef for plain `int' without `signed'
4039 can be controlled just like plain `int'. */
4040 || ! (typedef_decl != 0
4041 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4042 && TREE_CODE (type) != ENUMERAL_TYPE
4043 && !(specbits & 1 << (int) RID_SIGNED)))
4046 type = long_long_unsigned_type_node;
4047 else if (specbits & 1 << (int) RID_LONG)
4048 type = long_unsigned_type_node;
4049 else if (specbits & 1 << (int) RID_SHORT)
4050 type = short_unsigned_type_node;
4051 else if (type == char_type_node)
4052 type = unsigned_char_type_node;
4053 else if (typedef_decl)
4054 type = unsigned_type (type);
4056 type = unsigned_type_node;
4058 else if ((specbits & 1 << (int) RID_SIGNED)
4059 && type == char_type_node)
4060 type = signed_char_type_node;
4062 type = long_long_integer_type_node;
4063 else if (specbits & 1 << (int) RID_LONG)
4064 type = long_integer_type_node;
4065 else if (specbits & 1 << (int) RID_SHORT)
4066 type = short_integer_type_node;
4068 if (specbits & 1 << (int) RID_COMPLEX)
4070 /* If we just have "complex", it is equivalent to
4071 "complex double", but if any modifiers at all are specified it is
4072 the complex form of TYPE. E.g, "complex short" is
4073 "complex short int". */
4075 if (defaulted_int && ! longlong
4076 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4077 | (1 << (int) RID_SIGNED)
4078 | (1 << (int) RID_UNSIGNED))))
4079 type = complex_double_type_node;
4080 else if (type == integer_type_node)
4081 type = complex_integer_type_node;
4082 else if (type == float_type_node)
4083 type = complex_float_type_node;
4084 else if (type == double_type_node)
4085 type = complex_double_type_node;
4086 else if (type == long_double_type_node)
4087 type = complex_long_double_type_node;
4089 type = build_complex_type (type);
4092 /* Figure out the type qualifiers for the declaration. There are
4093 two ways a declaration can become qualified. One is something
4094 like `const int i' where the `const' is explicit. Another is
4095 something like `typedef const int CI; CI i' where the type of the
4096 declaration contains the `const'. */
4097 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4098 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4099 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4100 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4102 pedwarn ("duplicate `const'");
4104 pedwarn ("duplicate `restrict'");
4106 pedwarn ("duplicate `volatile'");
4107 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4108 type = TYPE_MAIN_VARIANT (type);
4109 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4110 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4111 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4113 /* Warn if two storage classes are given. Default to `auto'. */
4118 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4119 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4120 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4121 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4122 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4123 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4125 /* Warn about storage classes that are invalid for certain
4126 kinds of declarations (parameters, typenames, etc.). */
4129 error ("multiple storage classes in declaration of `%s'", name);
4130 else if (funcdef_flag
4132 & ((1 << (int) RID_REGISTER)
4133 | (1 << (int) RID_AUTO)
4134 | (1 << (int) RID_TYPEDEF))))
4136 if (specbits & 1 << (int) RID_AUTO
4137 && (pedantic || current_binding_level == global_binding_level))
4138 pedwarn ("function definition declared `auto'");
4139 if (specbits & 1 << (int) RID_REGISTER)
4140 error ("function definition declared `register'");
4141 if (specbits & 1 << (int) RID_TYPEDEF)
4142 error ("function definition declared `typedef'");
4143 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4144 | (1 << (int) RID_AUTO));
4146 else if (decl_context != NORMAL && nclasses > 0)
4148 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4152 switch (decl_context)
4155 error ("storage class specified for structure field `%s'", name);
4158 error ("storage class specified for parameter `%s'", name);
4161 error ("storage class specified for typename");
4164 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4165 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4166 | (1 << (int) RID_EXTERN));
4169 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4171 /* `extern' with initialization is invalid if not at top level. */
4172 if (current_binding_level == global_binding_level)
4173 warning ("`%s' initialized and declared `extern'", name);
4175 error ("`%s' has both `extern' and initializer", name);
4177 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4178 && current_binding_level != global_binding_level)
4179 error ("nested function `%s' declared `extern'", name);
4180 else if (current_binding_level == global_binding_level
4181 && specbits & (1 << (int) RID_AUTO))
4182 error ("top-level declaration of `%s' specifies `auto'", name);
4183 else if ((specbits & 1 << (int) RID_ITERATOR)
4184 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4186 error ("iterator `%s' has derived type", name);
4187 type = error_mark_node;
4189 else if ((specbits & 1 << (int) RID_ITERATOR)
4190 && TREE_CODE (type) != INTEGER_TYPE)
4192 error ("iterator `%s' has noninteger type", name);
4193 type = error_mark_node;
4197 /* Now figure out the structure of the declarator proper.
4198 Descend through it, creating more complex types, until we reach
4199 the declared identifier (or NULL_TREE, in an absolute declarator). */
4201 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4203 if (type == error_mark_node)
4205 declarator = TREE_OPERAND (declarator, 0);
4209 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4210 an INDIRECT_REF (for *...),
4211 a CALL_EXPR (for ...(...)),
4212 an identifier (for the name being declared)
4213 or a null pointer (for the place in an absolute declarator
4214 where the name was omitted).
4215 For the last two cases, we have just exited the loop.
4217 At this point, TYPE is the type of elements of an array,
4218 or for a function to return, or for a pointer to point to.
4219 After this sequence of ifs, TYPE is the type of the
4220 array or function or pointer, and DECLARATOR has had its
4221 outermost layer removed. */
4223 if (TREE_CODE (declarator) == ARRAY_REF)
4225 register tree itype = NULL_TREE;
4226 register tree size = TREE_OPERAND (declarator, 1);
4227 /* The index is a signed object `sizetype' bits wide. */
4228 tree index_type = signed_type (sizetype);
4230 declarator = TREE_OPERAND (declarator, 0);
4232 /* Check for some types that there cannot be arrays of. */
4234 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4236 error ("declaration of `%s' as array of voids", name);
4237 type = error_mark_node;
4240 if (TREE_CODE (type) == FUNCTION_TYPE)
4242 error ("declaration of `%s' as array of functions", name);
4243 type = error_mark_node;
4246 if (size == error_mark_node)
4247 type = error_mark_node;
4249 if (type == error_mark_node)
4252 /* If size was specified, set ITYPE to a range-type for that size.
4253 Otherwise, ITYPE remains null. finish_decl may figure it out
4254 from an initial value. */
4258 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4259 STRIP_TYPE_NOPS (size);
4261 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4262 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4264 error ("size of array `%s' has non-integer type", name);
4265 size = integer_one_node;
4268 if (pedantic && integer_zerop (size))
4269 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4271 if (TREE_CODE (size) == INTEGER_CST)
4273 constant_expression_warning (size);
4274 if (tree_int_cst_sgn (size) < 0)
4276 error ("size of array `%s' is negative", name);
4277 size = integer_one_node;
4282 /* Make sure the array size remains visibly nonconstant
4283 even if it is (eg) a const variable with known value. */
4288 if (TREE_CONSTANT (size))
4289 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4291 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4295 /* Convert size to index_type, so that if it is a variable
4296 the computations will be done in the proper mode. */
4297 itype = fold (build (MINUS_EXPR, index_type,
4298 convert (index_type, size),
4299 convert (index_type, size_one_node)));
4301 /* If that overflowed, the array is too big.
4302 ??? While a size of INT_MAX+1 technically shouldn't cause
4303 an overflow (because we subtract 1), the overflow is recorded
4304 during the conversion to index_type, before the subtraction.
4305 Handling this case seems like an unnecessary complication. */
4306 if (TREE_OVERFLOW (itype))
4308 error ("size of array `%s' is too large", name);
4309 type = error_mark_node;
4314 itype = variable_size (itype);
4315 itype = build_index_type (itype);
4318 #if 0 /* This had bad results for pointers to arrays, as in
4319 union incomplete (*foo)[4]; */
4320 /* Complain about arrays of incomplete types, except in typedefs. */
4322 if (!COMPLETE_TYPE_P (type)
4323 /* Avoid multiple warnings for nested array types. */
4324 && TREE_CODE (type) != ARRAY_TYPE
4325 && !(specbits & (1 << (int) RID_TYPEDEF))
4326 && !C_TYPE_BEING_DEFINED (type))
4327 warning ("array type has incomplete element type");
4330 #if 0 /* We shouldn't have a function type here at all!
4331 Functions aren't allowed as array elements. */
4332 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4333 && (constp || volatilep))
4334 pedwarn ("ANSI C forbids const or volatile function types");
4337 /* Build the array type itself, then merge any constancy or
4338 volatility into the target type. We must do it in this order
4339 to ensure that the TYPE_MAIN_VARIANT field of the array type
4340 is set correctly. */
4342 type = build_array_type (type, itype);
4344 type = c_build_qualified_type (type, type_quals);
4346 #if 0 /* don't clear these; leave them set so that the array type
4347 or the variable is itself const or volatile. */
4348 type_quals = TYPE_UNQUALIFIED;
4352 C_TYPE_VARIABLE_SIZE (type) = 1;
4354 else if (TREE_CODE (declarator) == CALL_EXPR)
4358 /* Declaring a function type.
4359 Make sure we have a valid type for the function to return. */
4360 if (type == error_mark_node)
4365 /* Warn about some types functions can't return. */
4367 if (TREE_CODE (type) == FUNCTION_TYPE)
4369 error ("`%s' declared as function returning a function", name);
4370 type = integer_type_node;
4372 if (TREE_CODE (type) == ARRAY_TYPE)
4374 error ("`%s' declared as function returning an array", name);
4375 type = integer_type_node;
4378 #ifndef TRADITIONAL_RETURN_FLOAT
4379 /* Traditionally, declaring return type float means double. */
4381 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4382 type = double_type_node;
4383 #endif /* TRADITIONAL_RETURN_FLOAT */
4385 /* Construct the function type and go to the next
4386 inner layer of declarator. */
4388 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4390 /* Say it's a definition
4391 only for the CALL_EXPR
4392 closest to the identifier. */
4393 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4394 /* Type qualifiers before the return type of the function
4395 qualify the return type, not the function type. */
4397 type = c_build_qualified_type (type, type_quals);
4398 type_quals = TYPE_UNQUALIFIED;
4400 type = build_function_type (type, arg_types);
4401 declarator = TREE_OPERAND (declarator, 0);
4403 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4404 the formal parameter list of this FUNCTION_TYPE to point to
4405 the FUNCTION_TYPE node itself. */
4410 for (link = last_function_parm_tags;
4412 link = TREE_CHAIN (link))
4413 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4416 else if (TREE_CODE (declarator) == INDIRECT_REF)
4418 /* Merge any constancy or volatility into the target type
4421 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4423 pedwarn ("ANSI C forbids qualified function types");
4425 type = c_build_qualified_type (type, type_quals);
4426 type_quals = TYPE_UNQUALIFIED;
4429 type = build_pointer_type (type);
4431 /* Process a list of type modifier keywords
4432 (such as const or volatile) that were given inside the `*'. */
4434 if (TREE_TYPE (declarator))
4436 register tree typemodlist;
4442 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4443 typemodlist = TREE_CHAIN (typemodlist))
4445 tree qualifier = TREE_VALUE (typemodlist);
4447 if (qualifier == ridpointers[(int) RID_CONST])
4449 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4451 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4456 error ("invalid type modifier within pointer declarator");
4460 pedwarn ("duplicate `const'");
4462 pedwarn ("duplicate `volatile'");
4464 pedwarn ("duplicate `restrict'");
4466 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4467 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4468 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4471 declarator = TREE_OPERAND (declarator, 0);
4478 /* Now TYPE has the actual type. */
4480 /* Did array size calculations overflow? */
4482 if (TREE_CODE (type) == ARRAY_TYPE
4483 && COMPLETE_TYPE_P (type)
4484 && TREE_OVERFLOW (TYPE_SIZE (type)))
4485 error ("size of array `%s' is too large", name);
4487 /* If this is declaring a typedef name, return a TYPE_DECL. */
4489 if (specbits & (1 << (int) RID_TYPEDEF))
4492 /* Note that the grammar rejects storage classes
4493 in typenames, fields or parameters */
4494 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4496 pedwarn ("ANSI C forbids qualified function types");
4498 type = c_build_qualified_type (type, type_quals);
4499 decl = build_decl (TYPE_DECL, declarator, type);
4500 if ((specbits & (1 << (int) RID_SIGNED))
4501 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4502 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4506 /* Detect the case of an array type of unspecified size
4507 which came, as such, direct from a typedef name.
4508 We must copy the type, so that each identifier gets
4509 a distinct type, so that each identifier's size can be
4510 controlled separately by its own initializer. */
4512 if (type != 0 && typedef_type != 0
4513 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4514 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4516 type = build_array_type (TREE_TYPE (type), 0);
4518 C_TYPE_VARIABLE_SIZE (type) = 1;
4521 /* If this is a type name (such as, in a cast or sizeof),
4522 compute the type and return it now. */
4524 if (decl_context == TYPENAME)
4526 /* Note that the grammar rejects storage classes
4527 in typenames, fields or parameters */
4528 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4530 pedwarn ("ANSI C forbids const or volatile function types");
4532 type = c_build_qualified_type (type, type_quals);
4536 /* Aside from typedefs and type names (handle above),
4537 `void' at top level (not within pointer)
4538 is allowed only in public variables.
4539 We don't complain about parms either, but that is because
4540 a better error message can be made later. */
4542 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4543 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4544 && ((specbits & (1 << (int) RID_EXTERN))
4545 || (current_binding_level == global_binding_level
4547 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4549 error ("variable or field `%s' declared void", name);
4550 type = integer_type_node;
4553 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4554 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4559 if (decl_context == PARM)
4561 tree type_as_written = type;
4564 /* A parameter declared as an array of T is really a pointer to T.
4565 One declared as a function is really a pointer to a function. */
4567 if (TREE_CODE (type) == ARRAY_TYPE)
4569 /* Transfer const-ness of array into that of type pointed to. */
4570 type = TREE_TYPE (type);
4572 type = c_build_qualified_type (type, type_quals);
4573 type = build_pointer_type (type);
4574 type_quals = TYPE_UNQUALIFIED;
4577 else if (TREE_CODE (type) == FUNCTION_TYPE)
4579 if (pedantic && type_quals)
4580 pedwarn ("ANSI C forbids qualified function types");
4582 type = c_build_qualified_type (type, type_quals);
4583 type = build_pointer_type (type);
4584 type_quals = TYPE_UNQUALIFIED;
4587 decl = build_decl (PARM_DECL, declarator, type);
4589 C_DECL_VARIABLE_SIZE (decl) = 1;
4591 /* Compute the type actually passed in the parmlist,
4592 for the case where there is no prototype.
4593 (For example, shorts and chars are passed as ints.)
4594 When there is a prototype, this is overridden later. */
4596 if (type == error_mark_node)
4597 promoted_type = type;
4600 promoted_type = simple_type_promotes_to (type);
4601 if (! promoted_type)
4602 promoted_type = type;
4605 DECL_ARG_TYPE (decl) = promoted_type;
4606 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4608 else if (decl_context == FIELD)
4610 /* Structure field. It may not be a function. */
4612 if (TREE_CODE (type) == FUNCTION_TYPE)
4614 error ("field `%s' declared as a function", name);
4615 type = build_pointer_type (type);
4617 else if (TREE_CODE (type) != ERROR_MARK
4618 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4620 error ("field `%s' has incomplete type", name);
4621 type = error_mark_node;
4623 /* Move type qualifiers down to element of an array. */
4624 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4626 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4628 TYPE_DOMAIN (type));
4629 #if 0 /* Leave the field const or volatile as well. */
4630 type_quals = TYPE_UNQUALIFIED;
4633 decl = build_decl (FIELD_DECL, declarator, type);
4635 C_DECL_VARIABLE_SIZE (decl) = 1;
4637 else if (TREE_CODE (type) == FUNCTION_TYPE)
4639 /* Every function declaration is "external"
4640 except for those which are inside a function body
4641 in which `auto' is used.
4642 That is a case not specified by ANSI C,
4643 and we use it for forward declarations for nested functions. */
4644 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4645 || current_binding_level == global_binding_level);
4647 if (specbits & (1 << (int) RID_AUTO)
4648 && (pedantic || current_binding_level == global_binding_level))
4649 pedwarn ("invalid storage class for function `%s'", name);
4650 if (specbits & (1 << (int) RID_REGISTER))
4651 error ("invalid storage class for function `%s'", name);
4652 /* Function declaration not at top level.
4653 Storage classes other than `extern' are not allowed
4654 and `extern' makes no difference. */
4655 if (current_binding_level != global_binding_level
4656 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4658 pedwarn ("invalid storage class for function `%s'", name);
4660 decl = build_decl (FUNCTION_DECL, declarator, type);
4661 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4663 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4664 pedwarn ("ANSI C forbids qualified function types");
4667 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4668 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4669 && ! DECL_IN_SYSTEM_HEADER (decl))
4670 pedwarn ("ANSI C forbids qualified void function return type");
4672 /* GNU C interprets a `volatile void' return type to indicate
4673 that the function does not return. */
4674 if ((type_quals & TYPE_QUAL_VOLATILE)
4675 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4676 warning ("`noreturn' function returns non-void value");
4679 DECL_EXTERNAL (decl) = 1;
4680 /* Record absence of global scope for `static' or `auto'. */
4682 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4684 /* Record presence of `inline', if it is reasonable. */
4687 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4688 warning ("cannot inline function `main'");
4690 /* Assume that otherwise the function can be inlined. */
4691 DECL_INLINE (decl) = 1;
4693 if (specbits & (1 << (int) RID_EXTERN))
4694 current_extern_inline = 1;
4699 /* It's a variable. */
4700 /* An uninitialized decl with `extern' is a reference. */
4701 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4703 /* Move type qualifiers down to element of an array. */
4704 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4706 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4708 TYPE_DOMAIN (type));
4709 #if 0 /* Leave the variable const or volatile as well. */
4710 type_quals = TYPE_UNQUALIFIED;
4714 decl = build_decl (VAR_DECL, declarator, type);
4716 C_DECL_VARIABLE_SIZE (decl) = 1;
4719 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4721 DECL_EXTERNAL (decl) = extern_ref;
4722 /* At top level, the presence of a `static' or `register' storage
4723 class specifier, or the absence of all storage class specifiers
4724 makes this declaration a definition (perhaps tentative). Also,
4725 the absence of both `static' and `register' makes it public. */
4726 if (current_binding_level == global_binding_level)
4730 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4731 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4733 /* Not at top level, only `static' makes a static definition. */
4736 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4737 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4740 if (specbits & 1 << (int) RID_ITERATOR)
4741 ITERATOR_P (decl) = 1;
4744 /* Record `register' declaration for warnings on &
4745 and in case doing stupid register allocation. */
4747 if (specbits & (1 << (int) RID_REGISTER))
4748 DECL_REGISTER (decl) = 1;
4750 /* Record constancy and volatility. */
4751 c_apply_type_quals_to_decl (type_quals, decl);
4753 /* If a type has volatile components, it should be stored in memory.
4754 Otherwise, the fact that those components are volatile
4755 will be ignored, and would even crash the compiler. */
4756 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4757 mark_addressable (decl);
4763 /* Decode the parameter-list info for a function type or function definition.
4764 The argument is the value returned by `get_parm_info' (or made in parse.y
4765 if there is an identifier list instead of a parameter decl list).
4766 These two functions are separate because when a function returns
4767 or receives functions then each is called multiple times but the order
4768 of calls is different. The last call to `grokparms' is always the one
4769 that contains the formal parameter names of a function definition.
4771 Store in `last_function_parms' a chain of the decls of parms.
4772 Also store in `last_function_parm_tags' a chain of the struct, union,
4773 and enum tags declared among the parms.
4775 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4777 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4778 a mere declaration. A nonempty identifier-list gets an error message
4779 when FUNCDEF_FLAG is zero. */
4782 grokparms (parms_info, funcdef_flag)
4786 tree first_parm = TREE_CHAIN (parms_info);
4788 last_function_parms = TREE_PURPOSE (parms_info);
4789 last_function_parm_tags = TREE_VALUE (parms_info);
4791 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4792 && !in_system_header)
4793 warning ("function declaration isn't a prototype");
4796 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4799 pedwarn ("parameter names (without types) in function declaration");
4801 last_function_parms = first_parm;
4808 /* We no longer test FUNCDEF_FLAG.
4809 If the arg types are incomplete in a declaration,
4810 they must include undefined tags.
4811 These tags can never be defined in the scope of the declaration,
4812 so the types can never be completed,
4813 and no call can be compiled successfully. */
4815 /* In a fcn definition, arg types must be complete. */
4818 for (parm = last_function_parms, typelt = first_parm;
4820 parm = TREE_CHAIN (parm))
4821 /* Skip over any enumeration constants declared here. */
4822 if (TREE_CODE (parm) == PARM_DECL)
4824 /* Barf if the parameter itself has an incomplete type. */
4825 tree type = TREE_VALUE (typelt);
4826 if (!COMPLETE_TYPE_P (type))
4828 if (funcdef_flag && DECL_NAME (parm) != 0)
4829 error ("parameter `%s' has incomplete type",
4830 IDENTIFIER_POINTER (DECL_NAME (parm)));
4832 warning ("parameter has incomplete type");
4835 TREE_VALUE (typelt) = error_mark_node;
4836 TREE_TYPE (parm) = error_mark_node;
4839 #if 0 /* This has been replaced by parm_tags_warning
4840 which uses a more accurate criterion for what to warn about. */
4843 /* Now warn if is a pointer to an incomplete type. */
4844 while (TREE_CODE (type) == POINTER_TYPE
4845 || TREE_CODE (type) == REFERENCE_TYPE)
4846 type = TREE_TYPE (type);
4847 type = TYPE_MAIN_VARIANT (type);
4848 if (!COMPLETE_TYPE_P (type))
4850 if (DECL_NAME (parm) != 0)
4851 warning ("parameter `%s' points to incomplete type",
4852 IDENTIFIER_POINTER (DECL_NAME (parm)));
4854 warning ("parameter points to incomplete type");
4858 typelt = TREE_CHAIN (typelt);
4866 /* Return a tree_list node with info on a parameter list just parsed.
4867 The TREE_PURPOSE is a chain of decls of those parms.
4868 The TREE_VALUE is a list of structure, union and enum tags defined.
4869 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4870 This tree_list node is later fed to `grokparms'.
4872 VOID_AT_END nonzero means append `void' to the end of the type-list.
4873 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4876 get_parm_info (void_at_end)
4879 register tree decl, t;
4880 register tree types = 0;
4882 tree tags = gettags ();
4883 tree parms = getdecls ();
4885 tree order = current_binding_level->parm_order;
4887 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4888 if (void_at_end && parms != 0
4889 && TREE_CHAIN (parms) == 0
4890 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4891 && DECL_NAME (parms) == 0)
4894 storedecls (NULL_TREE);
4895 return tree_cons (NULL_TREE, NULL_TREE,
4896 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4899 /* Extract enumerator values and other non-parms declared with the parms.
4900 Likewise any forward parm decls that didn't have real parm decls. */
4901 for (decl = parms; decl; )
4903 tree next = TREE_CHAIN (decl);
4905 if (TREE_CODE (decl) != PARM_DECL)
4907 TREE_CHAIN (decl) = new_parms;
4910 else if (TREE_ASM_WRITTEN (decl))
4912 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4913 TREE_CHAIN (decl) = new_parms;
4919 /* Put the parm decls back in the order they were in in the parm list. */
4920 for (t = order; t; t = TREE_CHAIN (t))
4923 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4925 TREE_CHAIN (TREE_VALUE (t)) = 0;
4928 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4931 /* Store the parmlist in the binding level since the old one
4932 is no longer a valid list. (We have changed the chain pointers.) */
4933 storedecls (new_parms);
4935 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4936 /* There may also be declarations for enumerators if an enumeration
4937 type is declared among the parms. Ignore them here. */
4938 if (TREE_CODE (decl) == PARM_DECL)
4940 /* Since there is a prototype,
4941 args are passed in their declared types. */
4942 tree type = TREE_TYPE (decl);
4943 DECL_ARG_TYPE (decl) = type;
4944 if (PROMOTE_PROTOTYPES
4945 && (TREE_CODE (type) == INTEGER_TYPE
4946 || TREE_CODE (type) == ENUMERAL_TYPE)
4947 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4948 DECL_ARG_TYPE (decl) = integer_type_node;
4950 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4951 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4952 && DECL_NAME (decl) == 0)
4954 error ("`void' in parameter list must be the entire list");
4960 return tree_cons (new_parms, tags,
4961 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4963 return tree_cons (new_parms, tags, nreverse (types));
4966 /* At end of parameter list, warn about any struct, union or enum tags
4967 defined within. Do so because these types cannot ever become complete. */
4970 parmlist_tags_warning ()
4975 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4977 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4978 /* An anonymous union parm type is meaningful as a GNU extension.
4979 So don't warn for that. */
4980 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4982 if (TREE_PURPOSE (elt) != 0)
4983 warning ("`%s %s' declared inside parameter list",
4984 (code == RECORD_TYPE ? "struct"
4985 : code == UNION_TYPE ? "union"
4987 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4989 warning ("anonymous %s declared inside parameter list",
4990 (code == RECORD_TYPE ? "struct"
4991 : code == UNION_TYPE ? "union"
4996 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5002 /* Get the struct, enum or union (CODE says which) with tag NAME.
5003 Define the tag as a forward-reference if it is not defined. */
5006 xref_tag (code, name)
5007 enum tree_code code;
5010 /* If a cross reference is requested, look up the type
5011 already defined for this tag and return it. */
5013 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5014 /* Even if this is the wrong type of tag, return what we found.
5015 There will be an error message anyway, from pending_xref_error.
5016 If we create an empty xref just for an invalid use of the type,
5017 the main result is to create lots of superfluous error messages. */
5021 /* If no such tag is yet defined, create a forward-reference node
5022 and record it as the "definition".
5023 When a real declaration of this type is found,
5024 the forward-reference will be altered into a real type. */
5026 ref = make_node (code);
5027 if (code == ENUMERAL_TYPE)
5029 /* (In ANSI, Enums can be referred to only if already defined.) */
5031 pedwarn ("ANSI C forbids forward references to `enum' types");
5032 /* Give the type a default layout like unsigned int
5033 to avoid crashing if it does not get defined. */
5034 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5035 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5036 TREE_UNSIGNED (ref) = 1;
5037 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5038 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5039 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5042 pushtag (name, ref);
5047 /* Make sure that the tag NAME is defined *in the current binding level*
5048 at least as a forward reference.
5049 CODE says which kind of tag NAME ought to be. */
5052 start_struct (code, name)
5053 enum tree_code code;
5056 /* If there is already a tag defined at this binding level
5057 (as a forward reference), just return it. */
5059 register tree ref = 0;
5062 ref = lookup_tag (code, name, current_binding_level, 1);
5063 if (ref && TREE_CODE (ref) == code)
5065 C_TYPE_BEING_DEFINED (ref) = 1;
5066 TYPE_PACKED (ref) = flag_pack_struct;
5067 if (TYPE_FIELDS (ref))
5068 error ("redefinition of `%s %s'",
5069 code == UNION_TYPE ? "union" : "struct",
5070 IDENTIFIER_POINTER (name));
5075 /* Otherwise create a forward-reference just so the tag is in scope. */
5077 ref = make_node (code);
5078 pushtag (name, ref);
5079 C_TYPE_BEING_DEFINED (ref) = 1;
5080 TYPE_PACKED (ref) = flag_pack_struct;
5084 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5085 of a structure component, returning a FIELD_DECL node.
5086 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5088 This is done during the parsing of the struct declaration.
5089 The FIELD_DECL nodes are chained together and the lot of them
5090 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5093 grokfield (filename, line, declarator, declspecs, width)
5094 const char *filename ATTRIBUTE_UNUSED;
5095 int line ATTRIBUTE_UNUSED;
5096 tree declarator, declspecs, width;
5100 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5102 finish_decl (value, NULL_TREE, NULL_TREE);
5103 DECL_INITIAL (value) = width;
5105 maybe_objc_check_decl (value);
5109 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5110 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5111 ATTRIBUTES are attributes to be applied to the structure. */
5114 finish_struct (t, fieldlist, attributes)
5120 int toplevel = global_binding_level == current_binding_level;
5122 /* If this type was previously laid out as a forward reference,
5123 make sure we lay it out again. */
5127 decl_attributes (t, attributes, NULL_TREE);
5129 /* Nameless union parm types are useful as GCC extension. */
5130 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5131 /* Otherwise, warn about any struct or union def. in parmlist. */
5132 if (in_parm_level_p ())
5135 pedwarn ("%s defined inside parms",
5136 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5137 else if (! flag_traditional)
5138 warning ("%s defined inside parms",
5139 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5144 for (x = fieldlist; x; x = TREE_CHAIN (x))
5145 if (DECL_NAME (x) != 0)
5149 pedwarn ("%s has no %smembers",
5150 TREE_CODE (t) == UNION_TYPE ? "union" : "struct",
5151 fieldlist ? "named " : "");
5154 /* Install struct as DECL_CONTEXT of each field decl.
5155 Also process specified field sizes,m which is found in the DECL_INITIAL.
5156 Store 0 there, except for ": 0" fields (so we can find them
5157 and delete them, below). */
5159 for (x = fieldlist; x; x = TREE_CHAIN (x))
5161 DECL_CONTEXT (x) = t;
5162 DECL_PACKED (x) |= TYPE_PACKED (t);
5164 /* If any field is const, the structure type is pseudo-const. */
5165 if (TREE_READONLY (x))
5166 C_TYPE_FIELDS_READONLY (t) = 1;
5169 /* A field that is pseudo-const makes the structure likewise. */
5170 tree t1 = TREE_TYPE (x);
5171 while (TREE_CODE (t1) == ARRAY_TYPE)
5172 t1 = TREE_TYPE (t1);
5173 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5174 && C_TYPE_FIELDS_READONLY (t1))
5175 C_TYPE_FIELDS_READONLY (t) = 1;
5178 /* Any field that is volatile means variables of this type must be
5179 treated in some ways as volatile. */
5180 if (TREE_THIS_VOLATILE (x))
5181 C_TYPE_FIELDS_VOLATILE (t) = 1;
5183 /* Any field of nominal variable size implies structure is too. */
5184 if (C_DECL_VARIABLE_SIZE (x))
5185 C_TYPE_VARIABLE_SIZE (t) = 1;
5187 /* Detect invalid nested redefinition. */
5188 if (TREE_TYPE (x) == t)
5189 error ("nested redefinition of `%s'",
5190 IDENTIFIER_POINTER (TYPE_NAME (t)));
5192 /* Detect invalid bit-field size. */
5193 if (DECL_INITIAL (x))
5194 STRIP_NOPS (DECL_INITIAL (x));
5195 if (DECL_INITIAL (x))
5197 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5198 constant_expression_warning (DECL_INITIAL (x));
5202 "bit-field `%s' width not an integer constant");
5203 DECL_INITIAL (x) = NULL;
5207 /* Detect invalid bit-field type. */
5208 if (DECL_INITIAL (x)
5209 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5210 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5212 error_with_decl (x, "bit-field `%s' has invalid type");
5213 DECL_INITIAL (x) = NULL;
5216 if (DECL_INITIAL (x) && pedantic
5217 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5218 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5219 /* Accept an enum that's equivalent to int or unsigned int. */
5220 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5221 && (TYPE_PRECISION (TREE_TYPE (x))
5222 == TYPE_PRECISION (integer_type_node))))
5223 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5225 /* Detect and ignore out of range field width and process valid
5227 if (DECL_INITIAL (x))
5229 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5230 error_with_decl (x, "negative width in bit-field `%s'");
5231 else if (0 < compare_tree_int (DECL_INITIAL (x),
5232 TYPE_PRECISION (TREE_TYPE (x))))
5233 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5234 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5235 error_with_decl (x, "zero width for bit-field `%s'");
5238 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5239 unsigned HOST_WIDE_INT width
5240 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5242 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5243 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5244 TREE_UNSIGNED (TREE_TYPE (x)))
5246 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5247 TREE_UNSIGNED (TREE_TYPE (x))))))
5248 warning_with_decl (x,
5249 "`%s' is narrower than values of its type");
5251 DECL_SIZE (x) = bitsize_int (width);
5252 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5256 /* field size 0 => force desired amount of alignment. */
5257 #ifdef EMPTY_FIELD_BOUNDARY
5258 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5260 #ifdef PCC_BITFIELD_TYPE_MATTERS
5261 if (PCC_BITFIELD_TYPE_MATTERS)
5262 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5263 TYPE_ALIGN (TREE_TYPE (x)));
5269 else if (TREE_TYPE (x) != error_mark_node)
5271 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5272 : TYPE_ALIGN (TREE_TYPE (x)));
5274 /* Non-bit-fields are aligned for their type, except packed
5275 fields which require only BITS_PER_UNIT alignment. */
5276 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5279 DECL_INITIAL (x) = 0;
5282 /* Delete all duplicate fields from the fieldlist */
5283 for (x = fieldlist; x && TREE_CHAIN (x);)
5284 /* Anonymous fields aren't duplicates. */
5285 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5289 register tree y = fieldlist;
5293 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5299 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5301 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5302 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5304 else x = TREE_CHAIN (x);
5307 /* Now we have the nearly final fieldlist. Record it,
5308 then lay out the structure or union (including the fields). */
5310 TYPE_FIELDS (t) = fieldlist;
5314 /* Delete all zero-width bit-fields from the fieldlist */
5316 tree *fieldlistp = &fieldlist;
5318 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5319 *fieldlistp = TREE_CHAIN (*fieldlistp);
5321 fieldlistp = &TREE_CHAIN (*fieldlistp);
5324 /* Now we have the truly final field list.
5325 Store it in this type and in the variants. */
5327 TYPE_FIELDS (t) = fieldlist;
5329 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5331 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5332 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5333 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5336 /* If this was supposed to be a transparent union, but we can't
5337 make it one, warn and turn off the flag. */
5338 if (TREE_CODE (t) == UNION_TYPE
5339 && TYPE_TRANSPARENT_UNION (t)
5340 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5342 TYPE_TRANSPARENT_UNION (t) = 0;
5343 warning ("union cannot be made transparent");
5346 /* If this structure or union completes the type of any previous
5347 variable declaration, lay it out and output its rtl. */
5349 if (current_binding_level->n_incomplete != 0)
5352 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5354 if (TREE_TYPE (decl) == t
5355 && TREE_CODE (decl) != TYPE_DECL)
5357 layout_decl (decl, 0);
5358 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5359 maybe_objc_check_decl (decl);
5360 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5363 --current_binding_level->n_incomplete;
5365 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5366 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5368 tree element = TREE_TYPE (decl);
5369 while (TREE_CODE (element) == ARRAY_TYPE)
5370 element = TREE_TYPE (element);
5372 layout_array_type (TREE_TYPE (decl));
5377 /* Finish debugging output for this type. */
5378 rest_of_type_compilation (t, toplevel);
5383 /* Lay out the type T, and its element type, and so on. */
5386 layout_array_type (t)
5389 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5390 layout_array_type (TREE_TYPE (t));
5394 /* Begin compiling the definition of an enumeration type.
5395 NAME is its name (or null if anonymous).
5396 Returns the type object, as yet incomplete.
5397 Also records info about it so that build_enumerator
5398 may be used to declare the individual values as they are read. */
5404 register tree enumtype = 0;
5406 /* If this is the real definition for a previous forward reference,
5407 fill in the contents in the same object that used to be the
5408 forward reference. */
5411 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5413 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5415 enumtype = make_node (ENUMERAL_TYPE);
5416 pushtag (name, enumtype);
5419 C_TYPE_BEING_DEFINED (enumtype) = 1;
5421 if (TYPE_VALUES (enumtype) != 0)
5423 /* This enum is a named one that has been declared already. */
5424 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5426 /* Completely replace its old definition.
5427 The old enumerators remain defined, however. */
5428 TYPE_VALUES (enumtype) = 0;
5431 enum_next_value = integer_zero_node;
5434 if (flag_short_enums)
5435 TYPE_PACKED (enumtype) = 1;
5440 /* After processing and defining all the values of an enumeration type,
5441 install their decls in the enumeration type and finish it off.
5442 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5443 and ATTRIBUTES are the specified attributes.
5444 Returns ENUMTYPE. */
5447 finish_enum (enumtype, values, attributes)
5452 register tree pair, tem;
5453 tree minnode = 0, maxnode = 0;
5454 int precision, unsign;
5455 int toplevel = (global_binding_level == current_binding_level);
5457 if (in_parm_level_p ())
5458 warning ("enum defined inside parms");
5460 decl_attributes (enumtype, attributes, NULL_TREE);
5462 /* Calculate the maximum value of any enumerator in this type. */
5464 if (values == error_mark_node)
5465 minnode = maxnode = integer_zero_node;
5468 minnode = maxnode = TREE_VALUE (values);
5469 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5471 tree value = TREE_VALUE (pair);
5472 if (tree_int_cst_lt (maxnode, value))
5474 if (tree_int_cst_lt (value, minnode))
5479 /* Construct the final type of this enumeration. It is the same
5480 as one of the integral types - the narrowest one that fits, except
5481 that normally we only go as narrow as int - and signed iff any of
5482 the values are negative. */
5483 unsign = (tree_int_cst_sgn (minnode) >= 0);
5484 precision = MAX (min_precision (minnode, unsign),
5485 min_precision (maxnode, unsign));
5486 if (!TYPE_PACKED (enumtype))
5487 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5488 if (type_for_size (precision, unsign) == 0)
5490 warning ("enumeration values exceed range of largest integer");
5491 precision = TYPE_PRECISION (long_long_integer_type_node);
5494 TYPE_MIN_VALUE (enumtype) = minnode;
5495 TYPE_MAX_VALUE (enumtype) = maxnode;
5496 TYPE_PRECISION (enumtype) = precision;
5497 TREE_UNSIGNED (enumtype) = unsign;
5498 TYPE_SIZE (enumtype) = 0;
5499 layout_type (enumtype);
5501 if (values != error_mark_node)
5503 /* Change the type of the enumerators to be the enum type. We
5504 need to do this irrespective of the size of the enum, for
5505 proper type checking. Replace the DECL_INITIALs of the
5506 enumerators, and the value slots of the list, with copies
5507 that have the enum type; they cannot be modified in place
5508 because they may be shared (e.g. integer_zero_node) Finally,
5509 change the purpose slots to point to the names of the decls. */
5510 for (pair = values; pair; pair = TREE_CHAIN (pair))
5512 tree enu = TREE_PURPOSE (pair);
5514 TREE_TYPE (enu) = enumtype;
5515 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5516 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5517 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5518 DECL_MODE (enu) = TYPE_MODE (enumtype);
5519 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5521 TREE_PURPOSE (pair) = DECL_NAME (enu);
5522 TREE_VALUE (pair) = DECL_INITIAL (enu);
5525 TYPE_VALUES (enumtype) = values;
5528 /* Fix up all variant types of this enum type. */
5529 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5531 if (tem == enumtype)
5533 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5534 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5535 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5536 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5537 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5538 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5539 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5540 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5541 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5544 /* Finish debugging output for this type. */
5545 rest_of_type_compilation (enumtype, toplevel);
5550 /* Build and install a CONST_DECL for one value of the
5551 current enumeration type (one that was begun with start_enum).
5552 Return a tree-list containing the CONST_DECL and its value.
5553 Assignment of sequential values by default is handled here. */
5556 build_enumerator (name, value)
5559 register tree decl, type;
5561 /* Validate and default VALUE. */
5563 /* Remove no-op casts from the value. */
5565 STRIP_TYPE_NOPS (value);
5569 if (TREE_CODE (value) == INTEGER_CST)
5571 value = default_conversion (value);
5572 constant_expression_warning (value);
5576 error ("enumerator value for `%s' not integer constant",
5577 IDENTIFIER_POINTER (name));
5582 /* Default based on previous value. */
5583 /* It should no longer be possible to have NON_LVALUE_EXPR
5587 value = enum_next_value;
5589 error ("overflow in enumeration values");
5592 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5594 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5595 value = integer_zero_node;
5598 /* Set basis for default for next value. */
5599 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5600 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5602 /* Now create a declaration for the enum value name. */
5604 type = TREE_TYPE (value);
5605 type = type_for_size (MAX (TYPE_PRECISION (type),
5606 TYPE_PRECISION (integer_type_node)),
5608 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5609 && TREE_UNSIGNED (type)));
5611 decl = build_decl (CONST_DECL, name, type);
5612 DECL_INITIAL (decl) = value;
5613 TREE_TYPE (value) = type;
5616 return tree_cons (decl, value, NULL_TREE);
5619 /* Create the FUNCTION_DECL for a function definition.
5620 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5621 the declaration; they describe the function's name and the type it returns,
5622 but twisted together in a fashion that parallels the syntax of C.
5624 This function creates a binding context for the function body
5625 as well as setting up the FUNCTION_DECL in current_function_decl.
5627 Returns 1 on success. If the DECLARATOR is not suitable for a function
5628 (it defines a datum instead), we return 0, which tells
5629 yyparse to report a parse error. */
5632 start_function (declspecs, declarator, prefix_attributes, attributes)
5633 tree declarator, declspecs, prefix_attributes, attributes;
5635 tree decl1, old_decl;
5637 int old_immediate_size_expand = immediate_size_expand;
5639 current_function_returns_value = 0; /* Assume, until we see it does. */
5640 current_function_returns_null = 0;
5641 warn_about_return_type = 0;
5642 current_extern_inline = 0;
5643 c_function_varargs = 0;
5645 shadowed_labels = 0;
5647 /* Don't expand any sizes in the return type of the function. */
5648 immediate_size_expand = 0;
5650 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5652 /* If the declarator is not suitable for a function definition,
5653 cause a syntax error. */
5656 immediate_size_expand = old_immediate_size_expand;
5660 decl_attributes (decl1, prefix_attributes, attributes);
5662 announce_function (decl1);
5664 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5666 error ("return-type is an incomplete type");
5667 /* Make it return void instead. */
5669 = build_function_type (void_type_node,
5670 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5673 if (warn_about_return_type)
5674 warning ("return-type defaults to `int'");
5676 /* Save the parm names or decls from this function's declarator
5677 where store_parm_decls will find them. */
5678 current_function_parms = last_function_parms;
5679 current_function_parm_tags = last_function_parm_tags;
5681 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5682 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5683 DECL_INITIAL (decl1) = error_mark_node;
5685 /* If this definition isn't a prototype and we had a prototype declaration
5686 before, copy the arg type info from that prototype.
5687 But not if what we had before was a builtin function. */
5688 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5689 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5690 && !DECL_BUILT_IN (old_decl)
5691 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5692 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5693 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5695 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5696 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5697 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5700 /* If there is no explicit declaration, look for any out-of-scope implicit
5703 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5705 /* Optionally warn of old-fashioned def with no previous prototype. */
5706 if (warn_strict_prototypes
5707 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5708 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5709 warning ("function declaration isn't a prototype");
5710 /* Optionally warn of any global def with no previous prototype. */
5711 else if (warn_missing_prototypes
5712 && TREE_PUBLIC (decl1)
5713 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5714 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5715 warning_with_decl (decl1, "no previous prototype for `%s'");
5716 /* Optionally warn of any def with no previous prototype
5717 if the function has already been used. */
5718 else if (warn_missing_prototypes
5719 && old_decl != 0 && TREE_USED (old_decl)
5720 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5721 warning_with_decl (decl1,
5722 "`%s' was used with no prototype before its definition");
5723 /* Optionally warn of any global def with no previous declaration. */
5724 else if (warn_missing_declarations
5725 && TREE_PUBLIC (decl1)
5727 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5728 warning_with_decl (decl1, "no previous declaration for `%s'");
5729 /* Optionally warn of any def with no previous declaration
5730 if the function has already been used. */
5731 else if (warn_missing_declarations
5732 && old_decl != 0 && TREE_USED (old_decl)
5733 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5734 warning_with_decl (decl1,
5735 "`%s' was used with no declaration before its definition");
5737 /* This is a definition, not a reference.
5738 So normally clear DECL_EXTERNAL.
5739 However, `extern inline' acts like a declaration
5740 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5741 DECL_EXTERNAL (decl1) = current_extern_inline;
5743 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5744 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5747 /* This function exists in static storage.
5748 (This does not mean `static' in the C sense!) */
5749 TREE_STATIC (decl1) = 1;
5751 /* A nested function is not global. */
5752 if (current_function_decl != 0)
5753 TREE_PUBLIC (decl1) = 0;
5755 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5757 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5762 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5763 != integer_type_node)
5764 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5766 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5767 args = TREE_CHAIN (args))
5769 tree type = args ? TREE_VALUE (args) : 0;
5771 if (type == void_type_node)
5778 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5779 pedwarn_with_decl (decl1,
5780 "first argument of `%s' should be `int'");
5784 if (TREE_CODE (type) != POINTER_TYPE
5785 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5786 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5788 pedwarn_with_decl (decl1,
5789 "second argument of `%s' should be `char **'");
5793 if (TREE_CODE (type) != POINTER_TYPE
5794 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5795 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5797 pedwarn_with_decl (decl1,
5798 "third argument of `%s' should probably be `char **'");
5803 /* It is intentional that this message does not mention the third
5804 argument, which is warned for only pedantically, because it's
5805 blessed by mention in an appendix of the standard. */
5806 if (argct > 0 && (argct < 2 || argct > 3))
5807 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5809 if (argct == 3 && pedantic)
5810 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5812 if (! TREE_PUBLIC (decl1))
5813 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5816 /* Record the decl so that the function name is defined.
5817 If we already have a decl for this name, and it is a FUNCTION_DECL,
5818 use the old decl. */
5820 current_function_decl = pushdecl (decl1);
5823 declare_parm_level (1);
5824 current_binding_level->subblocks_tag_transparent = 1;
5826 make_function_rtl (current_function_decl);
5828 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5829 /* Promote the value to int before returning it. */
5830 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5832 /* It retains unsignedness if traditional
5833 or if not really getting wider. */
5834 if (TREE_UNSIGNED (restype)
5835 && (flag_traditional
5836 || (TYPE_PRECISION (restype)
5837 == TYPE_PRECISION (integer_type_node))))
5838 restype = unsigned_type_node;
5840 restype = integer_type_node;
5842 DECL_RESULT (current_function_decl)
5843 = build_decl (RESULT_DECL, NULL_TREE, restype);
5845 /* If this fcn was already referenced via a block-scope `extern' decl
5846 (or an implicit decl), propagate certain information about the usage. */
5847 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5848 TREE_ADDRESSABLE (current_function_decl) = 1;
5850 immediate_size_expand = old_immediate_size_expand;
5855 /* Record that this function is going to be a varargs function.
5856 This is called before store_parm_decls, which is too early
5857 to call mark_varargs directly. */
5862 c_function_varargs = 1;
5865 /* Store the parameter declarations into the current function declaration.
5866 This is called after parsing the parameter declarations, before
5867 digesting the body of the function.
5869 For an old-style definition, modify the function's type
5870 to specify at least the number of arguments. */
5875 register tree fndecl = current_function_decl;
5878 /* This is either a chain of PARM_DECLs (if a prototype was used)
5879 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5880 tree specparms = current_function_parms;
5882 /* This is a list of types declared among parms in a prototype. */
5883 tree parmtags = current_function_parm_tags;
5885 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5886 register tree parmdecls = getdecls ();
5888 /* This is a chain of any other decls that came in among the parm
5889 declarations. If a parm is declared with enum {foo, bar} x;
5890 then CONST_DECLs for foo and bar are put here. */
5893 /* Nonzero if this definition is written with a prototype. */
5896 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5898 /* This case is when the function was defined with an ANSI prototype.
5899 The parms already have decls, so we need not do anything here
5900 except record them as in effect
5901 and complain if any redundant old-style parm decls were written. */
5912 error_with_decl (fndecl,
5913 "parm types given both in parmlist and separately");
5914 /* Get rid of the erroneous decls; don't keep them on
5915 the list of parms, since they might not be PARM_DECLs. */
5916 for (decl = current_binding_level->names;
5917 decl; decl = TREE_CHAIN (decl))
5918 if (DECL_NAME (decl))
5919 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5920 for (link = current_binding_level->shadowed;
5921 link; link = TREE_CHAIN (link))
5922 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5923 current_binding_level->names = 0;
5924 current_binding_level->shadowed = 0;
5927 specparms = nreverse (specparms);
5928 for (parm = specparms; parm; parm = next)
5930 next = TREE_CHAIN (parm);
5931 if (TREE_CODE (parm) == PARM_DECL)
5933 if (DECL_NAME (parm) == 0)
5934 error_with_decl (parm, "parameter name omitted");
5935 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5937 error_with_decl (parm, "parameter `%s' declared void");
5938 /* Change the type to error_mark_node so this parameter
5939 will be ignored by assign_parms. */
5940 TREE_TYPE (parm) = error_mark_node;
5946 /* If we find an enum constant or a type tag,
5947 put it aside for the moment. */
5948 TREE_CHAIN (parm) = 0;
5949 others = chainon (others, parm);
5953 /* Get the decls in their original chain order
5954 and record in the function. */
5955 DECL_ARGUMENTS (fndecl) = getdecls ();
5958 /* If this function takes a variable number of arguments,
5959 add a phony parameter to the end of the parm list,
5960 to represent the position of the first unnamed argument. */
5961 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5964 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5965 /* Let's hope the address of the unnamed parm
5966 won't depend on its type. */
5967 TREE_TYPE (dummy) = integer_type_node;
5968 DECL_ARG_TYPE (dummy) = integer_type_node;
5969 DECL_ARGUMENTS (fndecl)
5970 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5974 /* Now pushdecl the enum constants. */
5975 for (parm = others; parm; parm = next)
5977 next = TREE_CHAIN (parm);
5978 if (DECL_NAME (parm) == 0)
5980 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5982 else if (TREE_CODE (parm) != PARM_DECL)
5986 storetags (chainon (parmtags, gettags ()));
5990 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5991 each with a parm name as the TREE_VALUE.
5993 PARMDECLS is a chain of declarations for parameters.
5994 Warning! It can also contain CONST_DECLs which are not parameters
5995 but are names of enumerators of any enum types
5996 declared among the parameters.
5998 First match each formal parameter name with its declaration.
5999 Associate decls with the names and store the decls
6000 into the TREE_PURPOSE slots. */
6002 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6003 DECL_RESULT (parm) = 0;
6005 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6007 register tree tail, found = NULL;
6009 if (TREE_VALUE (parm) == 0)
6011 error_with_decl (fndecl, "parameter name missing from parameter list");
6012 TREE_PURPOSE (parm) = 0;
6016 /* See if any of the parmdecls specifies this parm by name.
6017 Ignore any enumerator decls. */
6018 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6019 if (DECL_NAME (tail) == TREE_VALUE (parm)
6020 && TREE_CODE (tail) == PARM_DECL)
6026 /* If declaration already marked, we have a duplicate name.
6027 Complain, and don't use this decl twice. */
6028 if (found && DECL_RESULT (found) != 0)
6030 error_with_decl (found, "multiple parameters named `%s'");
6034 /* If the declaration says "void", complain and ignore it. */
6035 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6037 error_with_decl (found, "parameter `%s' declared void");
6038 TREE_TYPE (found) = integer_type_node;
6039 DECL_ARG_TYPE (found) = integer_type_node;
6040 layout_decl (found, 0);
6043 /* Traditionally, a parm declared float is actually a double. */
6044 if (found && flag_traditional
6045 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6047 TREE_TYPE (found) = double_type_node;
6048 DECL_ARG_TYPE (found) = double_type_node;
6049 layout_decl (found, 0);
6052 /* If no declaration found, default to int. */
6055 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6057 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6058 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6059 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6061 warning_with_decl (found, "type of `%s' defaults to `int'");
6065 TREE_PURPOSE (parm) = found;
6067 /* Mark this decl as "already found" -- see test, above.
6068 It is safe to use DECL_RESULT for this
6069 since it is not used in PARM_DECLs or CONST_DECLs. */
6070 DECL_RESULT (found) = error_mark_node;
6073 /* Put anything which is on the parmdecls chain and which is
6074 not a PARM_DECL onto the list NONPARMS. (The types of
6075 non-parm things which might appear on the list include
6076 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6077 any actual PARM_DECLs not matched with any names. */
6080 for (parm = parmdecls; parm; )
6082 tree next = TREE_CHAIN (parm);
6083 TREE_CHAIN (parm) = 0;
6085 if (TREE_CODE (parm) != PARM_DECL)
6086 nonparms = chainon (nonparms, parm);
6089 /* Complain about args with incomplete types. */
6090 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6092 error_with_decl (parm, "parameter `%s' has incomplete type");
6093 TREE_TYPE (parm) = error_mark_node;
6096 if (DECL_RESULT (parm) == 0)
6098 error_with_decl (parm,
6099 "declaration for parameter `%s' but no such parameter");
6100 /* Pretend the parameter was not missing.
6101 This gets us to a standard state and minimizes
6102 further error messages. */
6104 = chainon (specparms,
6105 tree_cons (parm, NULL_TREE, NULL_TREE));
6112 /* Chain the declarations together in the order of the list of names. */
6113 /* Store that chain in the function decl, replacing the list of names. */
6115 DECL_ARGUMENTS (fndecl) = 0;
6118 for (last = 0; parm; parm = TREE_CHAIN (parm))
6119 if (TREE_PURPOSE (parm))
6122 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6124 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6125 last = TREE_PURPOSE (parm);
6126 TREE_CHAIN (last) = 0;
6130 /* If there was a previous prototype,
6131 set the DECL_ARG_TYPE of each argument according to
6132 the type previously specified, and report any mismatches. */
6134 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6137 for (parm = DECL_ARGUMENTS (fndecl),
6138 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6139 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6140 != void_type_node));
6141 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6143 if (parm == 0 || type == 0
6144 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6146 error ("number of arguments doesn't match prototype");
6147 error_with_file_and_line (current_function_prototype_file,
6148 current_function_prototype_line,
6149 "prototype declaration");
6152 /* Type for passing arg must be consistent
6153 with that declared for the arg. */
6154 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6156 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6157 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6159 /* Adjust argument to match prototype. E.g. a previous
6160 `int foo(float);' prototype causes
6161 `int foo(x) float x; {...}' to be treated like
6162 `int foo(float x) {...}'. This is particularly
6163 useful for argument types like uid_t. */
6164 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6166 if (PROMOTE_PROTOTYPES
6167 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6168 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6169 && TYPE_PRECISION (TREE_TYPE (parm))
6170 < TYPE_PRECISION (integer_type_node))
6171 DECL_ARG_TYPE (parm) = integer_type_node;
6175 pedwarn ("promoted argument `%s' doesn't match prototype",
6176 IDENTIFIER_POINTER (DECL_NAME (parm)));
6177 warning_with_file_and_line
6178 (current_function_prototype_file,
6179 current_function_prototype_line,
6180 "prototype declaration");
6183 /* If -traditional, allow `int' argument to match
6184 `unsigned' prototype. */
6185 else if (! (flag_traditional
6186 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6187 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6189 error ("argument `%s' doesn't match prototype",
6190 IDENTIFIER_POINTER (DECL_NAME (parm)));
6191 error_with_file_and_line (current_function_prototype_file,
6192 current_function_prototype_line,
6193 "prototype declaration");
6197 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6200 /* Otherwise, create a prototype that would match. */
6204 tree actual = 0, last = 0, type;
6206 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6208 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6210 TREE_CHAIN (last) = type;
6215 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6217 TREE_CHAIN (last) = type;
6221 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6222 of the type of this function, but we need to avoid having this
6223 affect the types of other similarly-typed functions, so we must
6224 first force the generation of an identical (but separate) type
6225 node for the relevant function type. The new node we create
6226 will be a variant of the main variant of the original function
6229 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6231 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6234 /* Now store the final chain of decls for the arguments
6235 as the decl-chain of the current lexical scope.
6236 Put the enumerators in as well, at the front so that
6237 DECL_ARGUMENTS is not modified. */
6239 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6242 /* Make sure the binding level for the top of the function body
6243 gets a BLOCK if there are any in the function.
6244 Otherwise, the dbx output is wrong. */
6246 keep_next_if_subblocks = 1;
6248 /* ??? This might be an improvement,
6249 but needs to be thought about some more. */
6251 keep_next_level_flag = 1;
6254 /* Write a record describing this function definition to the prototypes
6255 file (if requested). */
6257 gen_aux_info_record (fndecl, 1, 0, prototype);
6259 /* Initialize the RTL code for the function. */
6261 init_function_start (fndecl, input_filename, lineno);
6263 /* If this is a varargs function, inform function.c. */
6265 if (c_function_varargs)
6268 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6270 declare_function_name ();
6272 /* Set up parameters and prepare for return, for the function. */
6274 expand_function_start (fndecl, 0);
6276 /* If this function is `main', emit a call to `__main'
6277 to run global initializers, etc. */
6278 if (DECL_NAME (fndecl)
6279 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6280 && DECL_CONTEXT (fndecl) == NULL_TREE)
6281 expand_main_function ();
6284 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6285 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6286 stands for an ellipsis in the identifier list.
6288 PARMLIST is the data returned by get_parm_info for the
6289 parmlist that follows the semicolon.
6291 We return a value of the same sort that get_parm_info returns,
6292 except that it describes the combination of identifiers and parmlist. */
6295 combine_parm_decls (specparms, parmlist, void_at_end)
6296 tree specparms, parmlist;
6299 register tree fndecl = current_function_decl;
6302 tree parmdecls = TREE_PURPOSE (parmlist);
6304 /* This is a chain of any other decls that came in among the parm
6305 declarations. They were separated already by get_parm_info,
6306 so we just need to keep them separate. */
6307 tree nonparms = TREE_VALUE (parmlist);
6311 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6312 DECL_RESULT (parm) = 0;
6314 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6316 register tree tail, found = NULL;
6318 /* See if any of the parmdecls specifies this parm by name. */
6319 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6320 if (DECL_NAME (tail) == TREE_VALUE (parm))
6326 /* If declaration already marked, we have a duplicate name.
6327 Complain, and don't use this decl twice. */
6328 if (found && DECL_RESULT (found) != 0)
6330 error_with_decl (found, "multiple parameters named `%s'");
6334 /* If the declaration says "void", complain and ignore it. */
6335 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6337 error_with_decl (found, "parameter `%s' declared void");
6338 TREE_TYPE (found) = integer_type_node;
6339 DECL_ARG_TYPE (found) = integer_type_node;
6340 layout_decl (found, 0);
6343 /* Traditionally, a parm declared float is actually a double. */
6344 if (found && flag_traditional
6345 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6347 TREE_TYPE (found) = double_type_node;
6348 DECL_ARG_TYPE (found) = double_type_node;
6349 layout_decl (found, 0);
6352 /* If no declaration found, default to int. */
6355 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6357 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6358 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6359 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6360 error_with_decl (found, "type of parameter `%s' is not declared");
6364 TREE_PURPOSE (parm) = found;
6366 /* Mark this decl as "already found" -- see test, above.
6367 It is safe to use DECL_RESULT for this
6368 since it is not used in PARM_DECLs or CONST_DECLs. */
6369 DECL_RESULT (found) = error_mark_node;
6372 /* Complain about any actual PARM_DECLs not matched with any names. */
6374 for (parm = parmdecls; parm; )
6376 tree next = TREE_CHAIN (parm);
6377 TREE_CHAIN (parm) = 0;
6379 /* Complain about args with incomplete types. */
6380 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6382 error_with_decl (parm, "parameter `%s' has incomplete type");
6383 TREE_TYPE (parm) = error_mark_node;
6386 if (DECL_RESULT (parm) == 0)
6388 error_with_decl (parm,
6389 "declaration for parameter `%s' but no such parameter");
6390 /* Pretend the parameter was not missing.
6391 This gets us to a standard state and minimizes
6392 further error messages. */
6394 = chainon (specparms,
6395 tree_cons (parm, NULL_TREE, NULL_TREE));
6401 /* Chain the declarations together in the order of the list of names.
6402 At the same time, build up a list of their types, in reverse order. */
6408 for (last = 0; parm; parm = TREE_CHAIN (parm))
6409 if (TREE_PURPOSE (parm))
6412 parmdecls = TREE_PURPOSE (parm);
6414 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6415 last = TREE_PURPOSE (parm);
6416 TREE_CHAIN (last) = 0;
6418 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6423 return tree_cons (parmdecls, nonparms,
6424 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6426 return tree_cons (parmdecls, nonparms, nreverse (types));
6429 /* Finish up a function declaration and compile that function
6430 all the way to assembler language output. The free the storage
6431 for the function definition.
6433 This is called after parsing the body of the function definition.
6435 NESTED is nonzero if the function being finished is nested in another. */
6438 finish_function (nested)
6441 register tree fndecl = current_function_decl;
6443 /* TREE_READONLY (fndecl) = 1;
6444 This caused &foo to be of type ptr-to-const-function
6445 which then got a warning when stored in a ptr-to-function variable. */
6448 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6450 /* Must mark the RESULT_DECL as being in this function. */
6452 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6454 /* Obey `register' declarations if `setjmp' is called in this fn. */
6455 if (flag_traditional && current_function_calls_setjmp)
6457 setjmp_protect (DECL_INITIAL (fndecl));
6458 setjmp_protect_args ();
6461 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6463 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6464 != integer_type_node)
6466 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6467 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6469 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6473 #ifdef DEFAULT_MAIN_RETURN
6474 /* Make it so that `main' always returns success by default. */
6475 DEFAULT_MAIN_RETURN;
6480 /* Generate rtl for function exit. */
6481 expand_function_end (input_filename, lineno, 0);
6483 /* So we can tell if jump_optimize sets it to 1. */
6486 /* If this is a nested function, protect the local variables in the stack
6487 above us from being collected while we're compiling this function. */
6489 ggc_push_context ();
6491 /* Run the optimizers and output the assembler code for this function. */
6492 rest_of_compilation (fndecl);
6494 /* Undo the GC context switch. */
6498 current_function_returns_null |= can_reach_end;
6500 if (warn_missing_noreturn
6501 && !TREE_THIS_VOLATILE (fndecl)
6502 && !current_function_returns_null
6503 && !current_function_returns_value)
6504 warning ("function might be possible candidate for attribute `noreturn'");
6506 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6507 warning ("`noreturn' function does return");
6508 else if (warn_return_type && can_reach_end
6509 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6510 /* If this function returns non-void and control can drop through,
6512 warning ("control reaches end of non-void function");
6513 /* With just -W, complain only if function returns both with
6514 and without a value. */
6515 else if (extra_warnings
6516 && current_function_returns_value && current_function_returns_null)
6517 warning ("this function may return with or without a value");
6519 /* If requested, warn about function definitions where the function will
6520 return a value (usually of some struct or union type) which itself will
6521 take up a lot of stack space. */
6523 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6525 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6527 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6528 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6531 unsigned int size_as_int
6532 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6534 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6535 warning_with_decl (fndecl,
6536 "size of return value of `%s' is %u bytes",
6539 warning_with_decl (fndecl,
6540 "size of return value of `%s' is larger than %d bytes",
6545 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6547 /* Stop pointing to the local nodes about to be freed.
6548 But DECL_INITIAL must remain nonzero so we know this
6549 was an actual function definition.
6550 For a nested function, this is done in pop_c_function_context.
6551 If rest_of_compilation set this to 0, leave it 0. */
6552 if (DECL_INITIAL (fndecl) != 0)
6553 DECL_INITIAL (fndecl) = error_mark_node;
6555 DECL_ARGUMENTS (fndecl) = 0;
6558 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6560 #ifndef ASM_OUTPUT_CONSTRUCTOR
6561 if (! flag_gnu_linker)
6562 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6565 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6568 if (DECL_STATIC_DESTRUCTOR (fndecl))
6570 #ifndef ASM_OUTPUT_DESTRUCTOR
6571 if (! flag_gnu_linker)
6572 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6575 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6580 /* Let the error reporting routines know that we're outside a
6581 function. For a nested function, this value is used in
6582 pop_c_function_context and then reset via pop_function_context. */
6583 current_function_decl = NULL;
6587 /* Save and restore the variables in this file and elsewhere
6588 that keep track of the progress of compilation of the current function.
6589 Used for nested functions. */
6591 struct language_function
6594 tree shadowed_labels;
6597 int warn_about_return_type;
6599 struct binding_level *binding_level;
6602 /* Save and reinitialize the variables
6603 used during compilation of a C function. */
6606 push_c_function_context (f)
6609 struct language_function *p;
6610 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6613 p->named_labels = named_labels;
6614 p->shadowed_labels = shadowed_labels;
6615 p->returns_value = current_function_returns_value;
6616 p->returns_null = current_function_returns_null;
6617 p->warn_about_return_type = warn_about_return_type;
6618 p->extern_inline = current_extern_inline;
6619 p->binding_level = current_binding_level;
6622 /* Restore the variables used during compilation of a C function. */
6625 pop_c_function_context (f)
6628 struct language_function *p = f->language;
6631 /* Bring back all the labels that were shadowed. */
6632 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6633 if (DECL_NAME (TREE_VALUE (link)) != 0)
6634 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6635 = TREE_VALUE (link);
6637 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6639 /* Stop pointing to the local nodes about to be freed. */
6640 /* But DECL_INITIAL must remain nonzero so we know this
6641 was an actual function definition. */
6642 DECL_INITIAL (current_function_decl) = error_mark_node;
6643 DECL_ARGUMENTS (current_function_decl) = 0;
6646 named_labels = p->named_labels;
6647 shadowed_labels = p->shadowed_labels;
6648 current_function_returns_value = p->returns_value;
6649 current_function_returns_null = p->returns_null;
6650 warn_about_return_type = p->warn_about_return_type;
6651 current_extern_inline = p->extern_inline;
6652 current_binding_level = p->binding_level;
6658 /* Mark the language specific parts of F for GC. */
6660 mark_c_function_context (f)
6663 struct language_function *p = f->language;
6668 ggc_mark_tree (p->shadowed_labels);
6669 ggc_mark_tree (p->named_labels);
6670 mark_binding_level (&p->binding_level);
6673 /* integrate_decl_tree calls this function, but since we don't use the
6674 DECL_LANG_SPECIFIC field, this is a no-op. */
6677 copy_lang_decl (node)
6678 tree node ATTRIBUTE_UNUSED;
6682 /* Mark ARG for GC. */
6684 lang_mark_false_label_stack (arg)
6685 struct label_node *arg;
6687 /* C doesn't use false_label_stack. It better be NULL. */
6692 /* Mark the language specific bits in T for GC. */
6697 if (TREE_CODE (t) == IDENTIFIER_NODE)
6699 struct lang_identifier *i = (struct lang_identifier *) t;
6700 ggc_mark_tree (i->global_value);
6701 ggc_mark_tree (i->local_value);
6702 ggc_mark_tree (i->label_value);
6703 ggc_mark_tree (i->implicit_decl);
6704 ggc_mark_tree (i->error_locus);
6705 ggc_mark_tree (i->limbo_value);
6707 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6708 ggc_mark (TYPE_LANG_SPECIFIC (t));