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. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
78 #define WINT_TYPE "unsigned int"
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
87 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 const char *pending_invalid_xref_file;
90 int pending_invalid_xref_line;
92 /* While defining an enum type, this is 1 plus the last enumerator
93 constant value. Note that will do not have to save this or `enum_overflow'
94 around nested function definition since such a definition could only
95 occur in an enum value expression and we don't use these variables in
98 static tree enum_next_value;
100 /* Nonzero means that there was overflow computing enum_next_value. */
102 static int enum_overflow;
104 /* Parsing a function declarator leaves a list of parameter names
105 or a chain or parameter decls here. */
107 static tree last_function_parms;
109 /* Parsing a function declarator leaves here a chain of structure
110 and enum types declared in the parmlist. */
112 static tree last_function_parm_tags;
114 /* After parsing the declarator that starts a function definition,
115 `start_function' puts here the list of parameter names or chain of decls.
116 `store_parm_decls' finds it here. */
118 static tree current_function_parms;
120 /* Similar, for last_function_parm_tags. */
121 static tree current_function_parm_tags;
123 /* Similar, for the file and line that the prototype came from if this is
124 an old-style definition. */
125 static const char *current_function_prototype_file;
126 static int current_function_prototype_line;
128 /* The current statement tree. */
130 static struct stmt_tree_s c_stmt_tree;
132 /* The current scope statement stack. */
134 static tree c_scope_stmt_stack;
136 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
139 static int c_function_name_declared_p;
141 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
142 that have names. Here so we can clear out their names' definitions
143 at the end of the function. */
145 static tree named_labels;
147 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
149 static tree shadowed_labels;
151 /* Nonzero when store_parm_decls is called indicates a varargs function.
152 Value not meaningful after store_parm_decls. */
154 static int c_function_varargs;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a return statement that specifies a return value is seen. */
159 int current_function_returns_value;
161 /* Set to 0 at beginning of a function definition, set to 1 if
162 a return statement with no argument is seen. */
164 int current_function_returns_null;
166 /* Set to nonzero by `grokdeclarator' for a function
167 whose return type is defaulted, if warnings for this are desired. */
169 static int warn_about_return_type;
171 /* Nonzero when starting a function declared `extern inline'. */
173 static int current_extern_inline;
175 /* For each binding contour we allocate a binding_level structure
176 * which records the names defined in that contour.
179 * 1) one for each function definition,
180 * where internal declarations of the parameters appear.
181 * 2) one for each compound statement,
182 * to record its declarations.
184 * The current meaning of a name can be found by searching the levels from
185 * the current one out to the global one.
188 /* Note that the information in the `names' component of the global contour
189 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
193 /* A chain of _DECL nodes for all variables, constants, functions,
194 and typedef types. These are in the reverse of the order supplied.
198 /* A list of structure, union and enum definitions,
199 * for looking up tag names.
200 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
201 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
202 * or ENUMERAL_TYPE node.
206 /* For each level, a list of shadowed outer-level local definitions
207 to be restored when this level is popped.
208 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
209 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
212 /* For each level (except not the global one),
213 a chain of BLOCK nodes for all the levels
214 that were entered and exited one level down. */
217 /* The BLOCK node for this level, if one has been preallocated.
218 If 0, the BLOCK is allocated (if needed) when the level is popped. */
221 /* The binding level which this one is contained in (inherits from). */
222 struct binding_level *level_chain;
224 /* Nonzero for the level that holds the parameters of a function. */
227 /* Nonzero if this level "doesn't exist" for tags. */
228 char tag_transparent;
230 /* Nonzero if sublevels of this level "don't exist" for tags.
231 This is set in the parm level of a function definition
232 while reading the function body, so that the outermost block
233 of the function body will be tag-transparent. */
234 char subblocks_tag_transparent;
236 /* Nonzero means make a BLOCK for this level regardless of all else. */
239 /* Nonzero means make a BLOCK if this level has any subblocks. */
240 char keep_if_subblocks;
242 /* Number of decls in `names' that have incomplete
243 structure or union types. */
246 /* A list of decls giving the (reversed) specified order of parms,
247 not including any forward-decls in the parmlist.
248 This is so we can put the parms in proper order for assign_parms. */
252 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
254 /* The binding level currently in effect. */
256 static struct binding_level *current_binding_level;
258 /* A chain of binding_level structures awaiting reuse. */
260 static struct binding_level *free_binding_level;
262 /* The outermost binding level, for names of file scope.
263 This is created when the compiler is started and exists
264 through the entire run. */
266 static struct binding_level *global_binding_level;
268 /* Binding level structures are initialized by copying this one. */
270 static struct binding_level clear_binding_level
271 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
274 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
276 static int keep_next_level_flag;
278 /* Nonzero means make a BLOCK for the next level pushed
279 if it has subblocks. */
281 static int keep_next_if_subblocks;
283 /* The chain of outer levels of label scopes.
284 This uses the same data structure used for binding levels,
285 but it works differently: each link in the chain records
286 saved values of named_labels and shadowed_labels for
287 a label binding level outside the current one. */
289 static struct binding_level *label_level_chain;
291 /* Functions called automatically at the beginning and end of execution. */
293 tree static_ctors, static_dtors;
295 /* Forward declarations. */
297 static struct binding_level * make_binding_level PARAMS ((void));
298 static void mark_binding_level PARAMS ((void *));
299 static void clear_limbo_values PARAMS ((tree));
300 static int duplicate_decls PARAMS ((tree, tree, int));
301 static int redeclaration_error_message PARAMS ((tree, tree));
302 static void storedecls PARAMS ((tree));
303 static void storetags PARAMS ((tree));
304 static tree lookup_tag PARAMS ((enum tree_code, tree,
305 struct binding_level *, int));
306 static tree lookup_tag_reverse PARAMS ((tree));
307 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
309 static tree grokparms PARAMS ((tree, int));
310 static void layout_array_type PARAMS ((tree));
311 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
312 static void c_expand_body PARAMS ((tree, int));
314 /* C-specific option variables. */
316 /* Nonzero means allow type mismatches in conditional expressions;
317 just make their values `void'. */
319 int flag_cond_mismatch;
321 /* Nonzero means give `double' the same size as `float'. */
323 int flag_short_double;
325 /* Nonzero means give `wchar_t' the same size as `short'. */
327 int flag_short_wchar;
329 /* Nonzero means don't recognize the keyword `asm'. */
333 /* Nonzero means don't recognize any builtin functions. */
337 /* Nonzero means don't recognize the non-ANSI builtin functions.
340 int flag_no_nonansi_builtin;
342 /* Nonzero means do some things the same way PCC does. */
344 int flag_traditional;
346 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
350 /* Nonzero means use the ISO C99 dialect of C. */
354 /* Nonzero means accept digraphs. */
356 int flag_digraphs = 1;
358 /* Nonzero means that we have builtin functions, and main is an int */
362 /* Nonzero means add default format_arg attributes for functions not
365 int flag_noniso_default_format_attributes = 1;
367 /* Nonzero means to allow single precision math even if we're generally
368 being traditional. */
369 int flag_allow_single_precision = 0;
371 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
373 int flag_signed_bitfields = 1;
374 int explicit_flag_signed_bitfields = 0;
376 /* Nonzero means warn about use of implicit int. */
378 int warn_implicit_int;
380 /* Nonzero means warn about usage of long long when `-pedantic'. */
382 int warn_long_long = 1;
384 /* Nonzero means message about use of implicit function declarations;
385 1 means warning; 2 means error. */
387 int mesg_implicit_function_declaration = -1;
389 /* Nonzero means give string constants the type `const char *'
390 to get extra warnings from them. These warnings will be too numerous
391 to be useful, except in thoroughly ANSIfied programs. */
393 int flag_const_strings;
395 /* Nonzero means warn about pointer casts that can drop a type qualifier
396 from the pointer target type. */
400 /* Nonzero means warn when casting a function call to a type that does
401 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
402 when there is no previous declaration of sqrt or malloc. */
404 int warn_bad_function_cast;
406 /* Warn about functions which might be candidates for attribute noreturn. */
408 int warn_missing_noreturn;
410 /* Warn about traditional constructs whose meanings changed in ANSI C. */
412 int warn_traditional;
414 /* Nonzero means warn about sizeof(function) or addition/subtraction
415 of function pointers. */
417 int warn_pointer_arith;
419 /* Nonzero means warn for non-prototype function decls
420 or non-prototyped defs without previous prototype. */
422 int warn_strict_prototypes;
424 /* Nonzero means warn for any global function def
425 without separate previous prototype decl. */
427 int warn_missing_prototypes;
429 /* Nonzero means warn for any global function def
430 without separate previous decl. */
432 int warn_missing_declarations;
434 /* Nonzero means warn about multiple (redundant) decls for the same single
435 variable or function. */
437 int warn_redundant_decls = 0;
439 /* Nonzero means warn about extern declarations of objects not at
440 file-scope level and about *all* declarations of functions (whether
441 extern or static) not at file-scope level. Note that we exclude
442 implicit function declarations. To get warnings about those, use
445 int warn_nested_externs = 0;
447 /* Warn about *printf or *scanf format/argument anomalies. */
451 /* Warn about a subscript that has type char. */
453 int warn_char_subscripts = 0;
455 /* Warn if a type conversion is done that might have confusing results. */
459 /* Warn if adding () is suggested. */
461 int warn_parentheses;
463 /* Warn if initializer is not completely bracketed. */
465 int warn_missing_braces;
467 /* Warn if main is suspicious. */
471 /* Warn about #pragma directives that are not recognised. */
473 int warn_unknown_pragmas = 0; /* Tri state variable. */
475 /* Warn about comparison of signed and unsigned values.
476 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
478 int warn_sign_compare = -1;
480 /* Warn about testing equality of floating point numbers. */
482 int warn_float_equal = 0;
484 /* Nonzero means warn about use of multicharacter literals. */
486 int warn_multichar = 1;
488 /* The variant of the C language being processed. */
490 c_language_kind c_language = clk_c;
492 /* Nonzero means `$' can be in an identifier. */
494 #ifndef DOLLARS_IN_IDENTIFIERS
495 #define DOLLARS_IN_IDENTIFIERS 1
497 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
499 /* Decode the string P as a language-specific option for C.
500 Return the number of strings consumed. Should not complain
501 if it does not recognise the option. */
504 c_decode_option (argc, argv)
505 int argc ATTRIBUTE_UNUSED;
508 int strings_processed;
511 strings_processed = cpp_handle_option (&parse_in, argc, argv);
513 strings_processed = 0;
514 #endif /* ! USE_CPPLIB */
516 if (!strcmp (p, "-lang-objc"))
517 c_language = clk_objective_c;
518 else if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
520 flag_traditional = 1;
521 flag_writable_strings = 1;
524 else if (!strcmp (p, "-fallow-single-precision"))
525 flag_allow_single_precision = 1;
526 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
531 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
535 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
539 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
541 flag_traditional = 0;
542 flag_writable_strings = 0;
545 else if (!strncmp (p, "-std=", 5))
547 /* Select the appropriate language standard. We currently
549 -std=iso9899:1990 same as -ansi
550 -std=iso9899:199409 ISO C as modified in amend. 1
551 -std=iso9899:1999 ISO C 99
552 -std=c89 same as -std=iso9899:1990
553 -std=c99 same as -std=iso9899:1999
554 -std=gnu89 default, iso9899:1990 + gnu extensions
555 -std=gnu99 iso9899:1999 + gnu extensions
557 const char *argstart = &p[5];
559 if (!strcmp (argstart, "iso9899:1990")
560 || !strcmp (argstart, "c89"))
566 flag_traditional = 0;
567 flag_writable_strings = 0;
569 flag_no_nonansi_builtin = 1;
570 flag_noniso_default_format_attributes = 0;
573 else if (!strcmp (argstart, "iso9899:199409"))
577 goto iso_1990_digraphs;
579 else if (!strcmp (argstart, "iso9899:199x")
580 || !strcmp (argstart, "iso9899:1999")
581 || !strcmp (argstart, "c9x")
582 || !strcmp (argstart, "c99"))
584 flag_traditional = 0;
585 flag_writable_strings = 0;
587 flag_no_nonansi_builtin = 1;
588 flag_noniso_default_format_attributes = 0;
593 else if (!strcmp (argstart, "gnu89"))
595 flag_traditional = 0;
596 flag_writable_strings = 0;
598 flag_no_nonansi_builtin = 0;
599 flag_noniso_default_format_attributes = 1;
604 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
606 flag_traditional = 0;
607 flag_writable_strings = 0;
609 flag_no_nonansi_builtin = 0;
610 flag_noniso_default_format_attributes = 1;
616 error ("unknown C standard `%s'", argstart);
618 else if (!strcmp (p, "-fdollars-in-identifiers"))
619 dollars_in_ident = 1;
620 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
621 dollars_in_ident = 0;
622 else if (!strcmp (p, "-fsigned-char"))
623 flag_signed_char = 1;
624 else if (!strcmp (p, "-funsigned-char"))
625 flag_signed_char = 0;
626 else if (!strcmp (p, "-fno-signed-char"))
627 flag_signed_char = 0;
628 else if (!strcmp (p, "-fno-unsigned-char"))
629 flag_signed_char = 1;
630 else if (!strcmp (p, "-fsigned-bitfields")
631 || !strcmp (p, "-fno-unsigned-bitfields"))
633 flag_signed_bitfields = 1;
634 explicit_flag_signed_bitfields = 1;
636 else if (!strcmp (p, "-funsigned-bitfields")
637 || !strcmp (p, "-fno-signed-bitfields"))
639 flag_signed_bitfields = 0;
640 explicit_flag_signed_bitfields = 1;
642 else if (!strcmp (p, "-fshort-enums"))
643 flag_short_enums = 1;
644 else if (!strcmp (p, "-fno-short-enums"))
645 flag_short_enums = 0;
646 else if (!strcmp (p, "-fshort-wchar"))
647 flag_short_wchar = 1;
648 else if (!strcmp (p, "-fno-short-wchar"))
649 flag_short_wchar = 0;
650 else if (!strcmp (p, "-fcond-mismatch"))
651 flag_cond_mismatch = 1;
652 else if (!strcmp (p, "-fno-cond-mismatch"))
653 flag_cond_mismatch = 0;
654 else if (!strcmp (p, "-fshort-double"))
655 flag_short_double = 1;
656 else if (!strcmp (p, "-fno-short-double"))
657 flag_short_double = 0;
658 else if (!strcmp (p, "-fasm"))
660 else if (!strcmp (p, "-fno-asm"))
662 else if (!strcmp (p, "-fbuiltin"))
664 else if (!strcmp (p, "-fno-builtin"))
666 else if (!strcmp (p, "-ansi"))
668 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
669 mesg_implicit_function_declaration = 2;
670 else if (!strcmp (p, "-Wimplicit-function-declaration"))
671 mesg_implicit_function_declaration = 1;
672 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
673 mesg_implicit_function_declaration = 0;
674 else if (!strcmp (p, "-Wimplicit-int"))
675 warn_implicit_int = 1;
676 else if (!strcmp (p, "-Wno-implicit-int"))
677 warn_implicit_int = 0;
678 else if (!strcmp (p, "-Wimplicit"))
680 warn_implicit_int = 1;
681 if (mesg_implicit_function_declaration != 2)
682 mesg_implicit_function_declaration = 1;
684 else if (!strcmp (p, "-Wno-implicit"))
685 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
686 else if (!strcmp (p, "-Wlong-long"))
688 else if (!strcmp (p, "-Wno-long-long"))
690 else if (!strcmp (p, "-Wwrite-strings"))
691 flag_const_strings = 1;
692 else if (!strcmp (p, "-Wno-write-strings"))
693 flag_const_strings = 0;
694 else if (!strcmp (p, "-Wcast-qual"))
696 else if (!strcmp (p, "-Wno-cast-qual"))
698 else if (!strcmp (p, "-Wbad-function-cast"))
699 warn_bad_function_cast = 1;
700 else if (!strcmp (p, "-Wno-bad-function-cast"))
701 warn_bad_function_cast = 0;
702 else if (!strcmp (p, "-Wmissing-noreturn"))
703 warn_missing_noreturn = 1;
704 else if (!strcmp (p, "-Wno-missing-noreturn"))
705 warn_missing_noreturn = 0;
706 else if (!strcmp (p, "-Wpointer-arith"))
707 warn_pointer_arith = 1;
708 else if (!strcmp (p, "-Wno-pointer-arith"))
709 warn_pointer_arith = 0;
710 else if (!strcmp (p, "-Wstrict-prototypes"))
711 warn_strict_prototypes = 1;
712 else if (!strcmp (p, "-Wno-strict-prototypes"))
713 warn_strict_prototypes = 0;
714 else if (!strcmp (p, "-Wmissing-prototypes"))
715 warn_missing_prototypes = 1;
716 else if (!strcmp (p, "-Wno-missing-prototypes"))
717 warn_missing_prototypes = 0;
718 else if (!strcmp (p, "-Wmissing-declarations"))
719 warn_missing_declarations = 1;
720 else if (!strcmp (p, "-Wno-missing-declarations"))
721 warn_missing_declarations = 0;
722 else if (!strcmp (p, "-Wredundant-decls"))
723 warn_redundant_decls = 1;
724 else if (!strcmp (p, "-Wno-redundant-decls"))
725 warn_redundant_decls = 0;
726 else if (!strcmp (p, "-Wnested-externs"))
727 warn_nested_externs = 1;
728 else if (!strcmp (p, "-Wno-nested-externs"))
729 warn_nested_externs = 0;
730 else if (!strcmp (p, "-Wtraditional"))
731 warn_traditional = 1;
732 else if (!strcmp (p, "-Wno-traditional"))
733 warn_traditional = 0;
734 else if (!strncmp (p, "-Wformat=", 9))
735 warn_format = atol (p + 9);
736 else if (!strcmp (p, "-Wformat"))
738 else if (!strcmp (p, "-Wno-format"))
740 else if (!strcmp (p, "-Wchar-subscripts"))
741 warn_char_subscripts = 1;
742 else if (!strcmp (p, "-Wno-char-subscripts"))
743 warn_char_subscripts = 0;
744 else if (!strcmp (p, "-Wconversion"))
746 else if (!strcmp (p, "-Wno-conversion"))
748 else if (!strcmp (p, "-Wparentheses"))
749 warn_parentheses = 1;
750 else if (!strcmp (p, "-Wno-parentheses"))
751 warn_parentheses = 0;
752 else if (!strcmp (p, "-Wreturn-type"))
753 warn_return_type = 1;
754 else if (!strcmp (p, "-Wno-return-type"))
755 warn_return_type = 0;
756 else if (!strcmp (p, "-Wcomment"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wno-comment"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wcomments"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wno-comments"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wtrigraphs"))
765 ; /* cpp handles this one. */
766 else if (!strcmp (p, "-Wno-trigraphs"))
767 ; /* cpp handles this one. */
768 else if (!strcmp (p, "-Wundef"))
769 ; /* cpp handles this one. */
770 else if (!strcmp (p, "-Wno-undef"))
771 ; /* cpp handles this one. */
772 else if (!strcmp (p, "-Wimport"))
773 ; /* cpp handles this one. */
774 else if (!strcmp (p, "-Wno-import"))
775 ; /* cpp handles this one. */
776 else if (!strcmp (p, "-Wmissing-braces"))
777 warn_missing_braces = 1;
778 else if (!strcmp (p, "-Wno-missing-braces"))
779 warn_missing_braces = 0;
780 else if (!strcmp (p, "-Wmain"))
782 else if (!strcmp (p, "-Wno-main"))
784 else if (!strcmp (p, "-Wsign-compare"))
785 warn_sign_compare = 1;
786 else if (!strcmp (p, "-Wno-sign-compare"))
787 warn_sign_compare = 0;
788 else if (!strcmp (p, "-Wfloat-equal"))
789 warn_float_equal = 1;
790 else if (!strcmp (p, "-Wno-float-equal"))
791 warn_float_equal = 0;
792 else if (!strcmp (p, "-Wmultichar"))
794 else if (!strcmp (p, "-Wno-multichar"))
796 else if (!strcmp (p, "-Wunknown-pragmas"))
797 /* Set to greater than 1, so that even unknown pragmas in system
798 headers will be warned about. */
799 warn_unknown_pragmas = 2;
800 else if (!strcmp (p, "-Wno-unknown-pragmas"))
801 warn_unknown_pragmas = 0;
802 else if (!strcmp (p, "-Wall"))
804 /* We save the value of warn_uninitialized, since if they put
805 -Wuninitialized on the command line, we need to generate a
806 warning about not using it without also specifying -O. */
807 if (warn_uninitialized != 1)
808 warn_uninitialized = 2;
809 warn_implicit_int = 1;
810 mesg_implicit_function_declaration = 1;
811 warn_return_type = 1;
815 warn_char_subscripts = 1;
816 warn_parentheses = 1;
817 warn_missing_braces = 1;
818 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
819 it off only if it's not explicit. */
821 /* Only warn about unknown pragmas that are not in system headers. */
822 warn_unknown_pragmas = 1;
825 return strings_processed;
830 /* Hooks for print_node. */
833 print_lang_decl (file, node, indent)
834 FILE *file ATTRIBUTE_UNUSED;
835 tree node ATTRIBUTE_UNUSED;
836 int indent ATTRIBUTE_UNUSED;
841 print_lang_type (file, node, indent)
842 FILE *file ATTRIBUTE_UNUSED;
843 tree node ATTRIBUTE_UNUSED;
844 int indent ATTRIBUTE_UNUSED;
849 print_lang_identifier (file, node, indent)
854 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
855 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
856 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
857 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
858 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
859 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
860 if (C_IS_RESERVED_WORD (node))
862 tree rid = ridpointers[C_RID_CODE (node)];
863 indent_to (file, indent + 4);
864 fprintf (file, "rid ");
865 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
866 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
870 /* Hook called at end of compilation to assume 1 elt
871 for a top-level tentative array defn that wasn't complete before. */
874 finish_incomplete_decl (decl)
877 if (TREE_CODE (decl) == VAR_DECL)
879 tree type = TREE_TYPE (decl);
880 if (type != error_mark_node
881 && TREE_CODE (type) == ARRAY_TYPE
882 && ! DECL_EXTERNAL (decl)
883 && TYPE_DOMAIN (type) == 0)
885 warning_with_decl (decl, "array `%s' assumed to have one element");
887 complete_array_type (type, NULL_TREE, 1);
889 layout_decl (decl, 0);
894 /* Create a new `struct binding_level'. */
896 static struct binding_level *
897 make_binding_level ()
900 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
903 /* Nonzero if we are currently in the global binding level. */
908 return current_binding_level == global_binding_level;
914 keep_next_level_flag = 1;
917 /* Nonzero if the current level needs to have a BLOCK made. */
922 return ((current_binding_level->keep_if_subblocks
923 && current_binding_level->blocks != 0)
924 || current_binding_level->keep
925 || current_binding_level->names != 0
926 || (current_binding_level->tags != 0
927 && !current_binding_level->tag_transparent));
930 /* Identify this binding level as a level of parameters.
931 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
932 But it turns out there is no way to pass the right value for
933 DEFINITION_FLAG, so we ignore it. */
936 declare_parm_level (definition_flag)
937 int definition_flag ATTRIBUTE_UNUSED;
939 current_binding_level->parm_flag = 1;
942 /* Nonzero if currently making parm declarations. */
947 return current_binding_level->parm_flag;
950 /* Enter a new binding level.
951 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
952 not for that of tags. */
955 pushlevel (tag_transparent)
958 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
960 /* If this is the top level of a function,
961 just make sure that NAMED_LABELS is 0. */
963 if (current_binding_level == global_binding_level)
968 /* Reuse or create a struct for this binding level. */
970 if (free_binding_level)
972 newlevel = free_binding_level;
973 free_binding_level = free_binding_level->level_chain;
977 newlevel = make_binding_level ();
980 /* Add this level to the front of the chain (stack) of levels that
983 *newlevel = clear_binding_level;
984 newlevel->tag_transparent
986 || (current_binding_level
987 ? current_binding_level->subblocks_tag_transparent
989 newlevel->level_chain = current_binding_level;
990 current_binding_level = newlevel;
991 newlevel->keep = keep_next_level_flag;
992 keep_next_level_flag = 0;
993 newlevel->keep_if_subblocks = keep_next_if_subblocks;
994 keep_next_if_subblocks = 0;
997 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1000 clear_limbo_values (block)
1005 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1006 if (DECL_NAME (tem) != 0)
1007 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1009 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1010 clear_limbo_values (tem);
1013 /* Exit a binding level.
1014 Pop the level off, and restore the state of the identifier-decl mappings
1015 that were in effect when this level was entered.
1017 If KEEP is nonzero, this level had explicit declarations, so
1018 and create a "block" (a BLOCK node) for the level
1019 to record its declarations and subblocks for symbol table output.
1021 If FUNCTIONBODY is nonzero, this level is the body of a function,
1022 so create a block as if KEEP were set and also clear out all
1025 If REVERSE is nonzero, reverse the order of decls before putting
1026 them into the BLOCK. */
1029 poplevel (keep, reverse, functionbody)
1035 /* The chain of decls was accumulated in reverse order.
1036 Put it into forward order, just for cleanliness. */
1038 tree tags = current_binding_level->tags;
1039 tree subblocks = current_binding_level->blocks;
1042 int block_previously_created;
1044 keep |= current_binding_level->keep;
1046 /* This warning is turned off because it causes warnings for
1047 declarations like `extern struct foo *x'. */
1049 /* Warn about incomplete structure types in this level. */
1050 for (link = tags; link; link = TREE_CHAIN (link))
1051 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1053 tree type = TREE_VALUE (link);
1054 tree type_name = TYPE_NAME (type);
1055 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1057 : DECL_NAME (type_name));
1058 switch (TREE_CODE (type))
1061 error ("`struct %s' incomplete in scope ending here", id);
1064 error ("`union %s' incomplete in scope ending here", id);
1067 error ("`enum %s' incomplete in scope ending here", id);
1073 /* Get the decls in the order they were written.
1074 Usually current_binding_level->names is in reverse order.
1075 But parameter decls were previously put in forward order. */
1078 current_binding_level->names
1079 = decls = nreverse (current_binding_level->names);
1081 decls = current_binding_level->names;
1083 /* Output any nested inline functions within this block
1084 if they weren't already output. */
1086 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1087 if (TREE_CODE (decl) == FUNCTION_DECL
1088 && ! TREE_ASM_WRITTEN (decl)
1089 && DECL_INITIAL (decl) != 0
1090 && TREE_ADDRESSABLE (decl))
1092 /* If this decl was copied from a file-scope decl
1093 on account of a block-scope extern decl,
1094 propagate TREE_ADDRESSABLE to the file-scope decl.
1096 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1097 true, since then the decl goes through save_for_inline_copying. */
1098 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1099 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1100 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1103 /* If there were any declarations or structure tags in that level,
1104 or if this level is a function body,
1105 create a BLOCK to record them for the life of this function. */
1108 block_previously_created = (current_binding_level->this_block != 0);
1109 if (block_previously_created)
1110 block = current_binding_level->this_block;
1111 else if (keep || functionbody
1112 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1113 block = make_node (BLOCK);
1116 BLOCK_VARS (block) = decls;
1117 BLOCK_SUBBLOCKS (block) = subblocks;
1120 /* In each subblock, record that this is its superior. */
1122 for (link = subblocks; link; link = TREE_CHAIN (link))
1123 BLOCK_SUPERCONTEXT (link) = block;
1125 /* Clear out the meanings of the local variables of this level. */
1127 for (link = decls; link; link = TREE_CHAIN (link))
1129 if (DECL_NAME (link) != 0)
1131 /* If the ident. was used or addressed via a local extern decl,
1132 don't forget that fact. */
1133 if (DECL_EXTERNAL (link))
1135 if (TREE_USED (link))
1136 TREE_USED (DECL_NAME (link)) = 1;
1137 if (TREE_ADDRESSABLE (link))
1138 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1140 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1144 /* Restore all name-meanings of the outer levels
1145 that were shadowed by this level. */
1147 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1148 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1150 /* If the level being exited is the top level of a function,
1151 check over all the labels, and clear out the current
1152 (function local) meanings of their names. */
1156 clear_limbo_values (block);
1158 /* If this is the top level block of a function,
1159 the vars are the function's parameters.
1160 Don't leave them in the BLOCK because they are
1161 found in the FUNCTION_DECL instead. */
1163 BLOCK_VARS (block) = 0;
1165 /* Clear out the definitions of all label names,
1166 since their scopes end here,
1167 and add them to BLOCK_VARS. */
1169 for (link = named_labels; link; link = TREE_CHAIN (link))
1171 register tree label = TREE_VALUE (link);
1173 if (DECL_INITIAL (label) == 0)
1175 error_with_decl (label, "label `%s' used but not defined");
1176 /* Avoid crashing later. */
1177 define_label (input_filename, lineno,
1180 else if (warn_unused_label && !TREE_USED (label))
1181 warning_with_decl (label, "label `%s' defined but not used");
1182 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1184 /* Put the labels into the "variables" of the
1185 top-level block, so debugger can see them. */
1186 TREE_CHAIN (label) = BLOCK_VARS (block);
1187 BLOCK_VARS (block) = label;
1191 /* Pop the current level, and free the structure for reuse. */
1194 register struct binding_level *level = current_binding_level;
1195 current_binding_level = current_binding_level->level_chain;
1197 level->level_chain = free_binding_level;
1198 free_binding_level = level;
1201 /* Dispose of the block that we just made inside some higher level. */
1203 DECL_INITIAL (current_function_decl) = block;
1206 if (!block_previously_created)
1207 current_binding_level->blocks
1208 = chainon (current_binding_level->blocks, block);
1210 /* If we did not make a block for the level just exited,
1211 any blocks made for inner levels
1212 (since they cannot be recorded as subblocks in that level)
1213 must be carried forward so they will later become subblocks
1214 of something else. */
1216 current_binding_level->blocks
1217 = chainon (current_binding_level->blocks, subblocks);
1219 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1220 binding contour so that they point to the appropriate construct, i.e.
1221 either to the current FUNCTION_DECL node, or else to the BLOCK node
1222 we just constructed.
1224 Note that for tagged types whose scope is just the formal parameter
1225 list for some function type specification, we can't properly set
1226 their TYPE_CONTEXTs here, because we don't have a pointer to the
1227 appropriate FUNCTION_TYPE node readily available to us. For those
1228 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1229 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1230 node which will represent the "scope" for these "parameter list local"
1234 for (link = tags; link; link = TREE_CHAIN (link))
1235 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1237 for (link = tags; link; link = TREE_CHAIN (link))
1238 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1241 TREE_USED (block) = 1;
1246 /* Delete the node BLOCK from the current binding level.
1247 This is used for the block inside a stmt expr ({...})
1248 so that the block can be reinserted where appropriate. */
1251 delete_block (block)
1255 if (current_binding_level->blocks == block)
1256 current_binding_level->blocks = TREE_CHAIN (block);
1257 for (t = current_binding_level->blocks; t;)
1259 if (TREE_CHAIN (t) == block)
1260 TREE_CHAIN (t) = TREE_CHAIN (block);
1264 TREE_CHAIN (block) = NULL;
1265 /* Clear TREE_USED which is always set by poplevel.
1266 The flag is set again if insert_block is called. */
1267 TREE_USED (block) = 0;
1270 /* Insert BLOCK at the end of the list of subblocks of the
1271 current binding level. This is used when a BIND_EXPR is expanded,
1272 to handle the BLOCK node inside the BIND_EXPR. */
1275 insert_block (block)
1278 TREE_USED (block) = 1;
1279 current_binding_level->blocks
1280 = chainon (current_binding_level->blocks, block);
1283 /* Set the BLOCK node for the innermost scope
1284 (the one we are currently in). */
1288 register tree block;
1290 current_binding_level->this_block = block;
1296 register struct binding_level *newlevel;
1298 /* Reuse or create a struct for this binding level. */
1300 if (free_binding_level)
1302 newlevel = free_binding_level;
1303 free_binding_level = free_binding_level->level_chain;
1307 newlevel = make_binding_level ();
1310 /* Add this level to the front of the chain (stack) of label levels. */
1312 newlevel->level_chain = label_level_chain;
1313 label_level_chain = newlevel;
1315 newlevel->names = named_labels;
1316 newlevel->shadowed = shadowed_labels;
1318 shadowed_labels = 0;
1324 register struct binding_level *level = label_level_chain;
1327 /* Clear out the definitions of the declared labels in this level.
1328 Leave in the list any ordinary, non-declared labels. */
1329 for (link = named_labels, prev = 0; link;)
1331 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1333 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1335 error_with_decl (TREE_VALUE (link),
1336 "label `%s' used but not defined");
1337 /* Avoid crashing later. */
1338 define_label (input_filename, lineno,
1339 DECL_NAME (TREE_VALUE (link)));
1341 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1342 warning_with_decl (TREE_VALUE (link),
1343 "label `%s' defined but not used");
1344 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1346 /* Delete this element from the list. */
1347 link = TREE_CHAIN (link);
1349 TREE_CHAIN (prev) = link;
1351 named_labels = link;
1356 link = TREE_CHAIN (link);
1360 /* Bring back all the labels that were shadowed. */
1361 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1362 if (DECL_NAME (TREE_VALUE (link)) != 0)
1363 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1364 = TREE_VALUE (link);
1366 named_labels = chainon (named_labels, level->names);
1367 shadowed_labels = level->shadowed;
1369 /* Pop the current level, and free the structure for reuse. */
1370 label_level_chain = label_level_chain->level_chain;
1371 level->level_chain = free_binding_level;
1372 free_binding_level = level;
1375 /* Push a definition or a declaration of struct, union or enum tag "name".
1376 "type" should be the type node.
1377 We assume that the tag "name" is not already defined.
1379 Note that the definition may really be just a forward reference.
1380 In that case, the TYPE_SIZE will be zero. */
1383 pushtag (name, type)
1386 register struct binding_level *b;
1388 /* Find the proper binding level for this type tag. */
1390 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1395 /* Record the identifier as the type's name if it has none. */
1397 if (TYPE_NAME (type) == 0)
1398 TYPE_NAME (type) = name;
1401 b->tags = tree_cons (name, type, b->tags);
1403 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1404 tagged type we just added to the current binding level. This fake
1405 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1406 to output a representation of a tagged type, and it also gives
1407 us a convenient place to record the "scope start" address for the
1410 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1412 /* An approximation for now, so we can tell this is a function-scope tag.
1413 This will be updated in poplevel. */
1414 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1417 /* Handle when a new declaration NEWDECL
1418 has the same name as an old one OLDDECL
1419 in the same binding contour.
1420 Prints an error message if appropriate.
1422 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1423 Otherwise, return 0.
1425 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1426 and OLDDECL is in an outer binding level and should thus not be changed. */
1429 duplicate_decls (newdecl, olddecl, different_binding_level)
1430 register tree newdecl, olddecl;
1431 int different_binding_level;
1433 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1434 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1435 && DECL_INITIAL (newdecl) != 0);
1436 tree oldtype = TREE_TYPE (olddecl);
1437 tree newtype = TREE_TYPE (newdecl);
1440 if (DECL_P (olddecl))
1441 DECL_MACHINE_ATTRIBUTES (newdecl)
1442 = merge_machine_decl_attributes (olddecl, newdecl);
1444 if (TREE_CODE (newtype) == ERROR_MARK
1445 || TREE_CODE (oldtype) == ERROR_MARK)
1448 /* New decl is completely inconsistent with the old one =>
1449 tell caller to replace the old one.
1450 This is always an error except in the case of shadowing a builtin. */
1451 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1453 if (TREE_CODE (olddecl) == FUNCTION_DECL
1454 && (DECL_BUILT_IN (olddecl)
1455 || DECL_BUILT_IN_NONANSI (olddecl)))
1457 /* If you declare a built-in or predefined function name as static,
1458 the old definition is overridden,
1459 but optionally warn this was a bad choice of name. */
1460 if (!TREE_PUBLIC (newdecl))
1464 else if (DECL_BUILT_IN (olddecl))
1465 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1467 warning_with_decl (newdecl, "shadowing library function `%s'");
1469 /* Likewise, if the built-in is not ansi, then programs can
1470 override it even globally without an error. */
1471 else if (! DECL_BUILT_IN (olddecl))
1472 warning_with_decl (newdecl,
1473 "library function `%s' declared as non-function");
1475 else if (DECL_BUILT_IN_NONANSI (olddecl))
1476 warning_with_decl (newdecl,
1477 "built-in function `%s' declared as non-function");
1479 warning_with_decl (newdecl,
1480 "built-in function `%s' declared as non-function");
1484 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1485 error_with_decl (olddecl, "previous declaration of `%s'");
1491 /* For real parm decl following a forward decl,
1492 return 1 so old decl will be reused. */
1493 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1494 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1497 /* The new declaration is the same kind of object as the old one.
1498 The declarations may partially match. Print warnings if they don't
1499 match enough. Ultimately, copy most of the information from the new
1500 decl to the old one, and keep using the old one. */
1502 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1503 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1504 && DECL_INITIAL (olddecl) == 0)
1505 /* If -traditional, avoid error for redeclaring fcn
1506 after implicit decl. */
1508 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1509 && DECL_BUILT_IN (olddecl))
1511 /* A function declaration for a built-in function. */
1512 if (!TREE_PUBLIC (newdecl))
1514 /* If you declare a built-in function name as static, the
1515 built-in definition is overridden,
1516 but optionally warn this was a bad choice of name. */
1518 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1519 /* Discard the old built-in function. */
1522 else if (!types_match)
1524 /* Accept the return type of the new declaration if same modes. */
1525 tree oldreturntype = TREE_TYPE (oldtype);
1526 tree newreturntype = TREE_TYPE (newtype);
1528 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1530 /* Function types may be shared, so we can't just modify
1531 the return type of olddecl's function type. */
1533 = build_function_type (newreturntype,
1534 TYPE_ARG_TYPES (oldtype));
1536 types_match = comptypes (newtype, trytype);
1540 /* Accept harmless mismatch in first argument type also.
1542 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1543 && TYPE_ARG_TYPES (oldtype) != 0
1544 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1545 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1546 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1547 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1549 /* Function types may be shared, so we can't just modify
1550 the return type of olddecl's function type. */
1552 = build_function_type (TREE_TYPE (oldtype),
1553 tree_cons (NULL_TREE,
1554 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1555 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1557 types_match = comptypes (newtype, trytype);
1561 if (! different_binding_level)
1562 TREE_TYPE (olddecl) = oldtype;
1566 /* If types don't match for a built-in, throw away the built-in. */
1567 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1571 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1572 && DECL_SOURCE_LINE (olddecl) == 0)
1574 /* A function declaration for a predeclared function
1575 that isn't actually built in. */
1576 if (!TREE_PUBLIC (newdecl))
1578 /* If you declare it as static, the
1579 default definition is overridden. */
1582 else if (!types_match)
1584 /* If the types don't match, preserve volatility indication.
1585 Later on, we will discard everything else about the
1586 default declaration. */
1587 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1590 /* Permit char *foo () to match void *foo (...) if not pedantic,
1591 if one of them came from a system header file. */
1592 else if (!types_match
1593 && TREE_CODE (olddecl) == FUNCTION_DECL
1594 && TREE_CODE (newdecl) == FUNCTION_DECL
1595 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1596 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1597 && (DECL_IN_SYSTEM_HEADER (olddecl)
1598 || DECL_IN_SYSTEM_HEADER (newdecl))
1599 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1600 && TYPE_ARG_TYPES (oldtype) == 0
1601 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1602 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1604 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1605 && TYPE_ARG_TYPES (newtype) == 0
1606 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1607 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1610 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1611 /* Make sure we keep void * as ret type, not char *. */
1612 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1613 TREE_TYPE (newdecl) = newtype = oldtype;
1615 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1616 we will come back here again. */
1617 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1619 else if (!types_match
1620 /* Permit char *foo (int, ...); followed by char *foo ();
1622 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1624 /* Return types must still match. */
1625 && comptypes (TREE_TYPE (oldtype),
1626 TREE_TYPE (newtype))
1627 && TYPE_ARG_TYPES (newtype) == 0))
1629 error_with_decl (newdecl, "conflicting types for `%s'");
1630 /* Check for function type mismatch
1631 involving an empty arglist vs a nonempty one. */
1632 if (TREE_CODE (olddecl) == FUNCTION_DECL
1633 && comptypes (TREE_TYPE (oldtype),
1634 TREE_TYPE (newtype))
1635 && ((TYPE_ARG_TYPES (oldtype) == 0
1636 && DECL_INITIAL (olddecl) == 0)
1638 (TYPE_ARG_TYPES (newtype) == 0
1639 && DECL_INITIAL (newdecl) == 0)))
1641 /* Classify the problem further. */
1642 register tree t = TYPE_ARG_TYPES (oldtype);
1644 t = TYPE_ARG_TYPES (newtype);
1645 for (; t; t = TREE_CHAIN (t))
1647 register tree type = TREE_VALUE (t);
1649 if (TREE_CHAIN (t) == 0
1650 && TYPE_MAIN_VARIANT (type) != void_type_node)
1652 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1656 if (simple_type_promotes_to (type) != NULL_TREE)
1658 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1663 error_with_decl (olddecl, "previous declaration of `%s'");
1667 errmsg = redeclaration_error_message (newdecl, olddecl);
1673 error_with_decl (newdecl, "redefinition of `%s'");
1676 error_with_decl (newdecl, "redeclaration of `%s'");
1679 error_with_decl (newdecl, "conflicting declarations of `%s'");
1685 error_with_decl (olddecl,
1686 ((DECL_INITIAL (olddecl)
1687 && current_binding_level == global_binding_level)
1688 ? "`%s' previously defined here"
1689 : "`%s' previously declared here"));
1691 else if (TREE_CODE (newdecl) == TYPE_DECL
1692 && (DECL_IN_SYSTEM_HEADER (olddecl)
1693 || DECL_IN_SYSTEM_HEADER (newdecl)))
1695 warning_with_decl (newdecl, "redefinition of `%s'");
1698 ((DECL_INITIAL (olddecl)
1699 && current_binding_level == global_binding_level)
1700 ? "`%s' previously defined here"
1701 : "`%s' previously declared here"));
1703 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1704 && DECL_INITIAL (olddecl) != 0
1705 && TYPE_ARG_TYPES (oldtype) == 0
1706 && TYPE_ARG_TYPES (newtype) != 0
1707 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1709 register tree type, parm;
1711 /* Prototype decl follows defn w/o prototype. */
1713 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1714 type = TYPE_ARG_TYPES (newtype),
1717 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1719 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1720 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1722 warning_with_decl (newdecl, "prototype for `%s' follows");
1723 warning_with_decl (olddecl, "non-prototype definition here");
1726 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1727 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1729 error_with_decl (newdecl,
1730 "prototype for `%s' follows and number of arguments doesn't match");
1731 error_with_decl (olddecl, "non-prototype definition here");
1735 /* Type for passing arg must be consistent
1736 with that declared for the arg. */
1737 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1738 /* If -traditional, allow `unsigned int' instead of `int'
1739 in the prototype. */
1740 && (! (flag_traditional
1741 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1742 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1744 error_with_decl (newdecl,
1745 "prototype for `%s' follows and argument %d doesn't match",
1747 error_with_decl (olddecl, "non-prototype definition here");
1753 /* Warn about mismatches in various flags. */
1756 /* Warn if function is now inline
1757 but was previously declared not inline and has been called. */
1758 if (TREE_CODE (olddecl) == FUNCTION_DECL
1759 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1760 && TREE_USED (olddecl))
1761 warning_with_decl (newdecl,
1762 "`%s' declared inline after being called");
1763 if (TREE_CODE (olddecl) == FUNCTION_DECL
1764 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1765 && DECL_INITIAL (olddecl) != 0)
1766 warning_with_decl (newdecl,
1767 "`%s' declared inline after its definition");
1769 /* If pedantic, warn when static declaration follows a non-static
1770 declaration. Otherwise, do so only for functions. */
1771 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1772 && TREE_PUBLIC (olddecl)
1773 && !TREE_PUBLIC (newdecl))
1774 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1776 /* If warn_traditional, warn when a non-static function
1777 declaration follows a static one. */
1778 if (warn_traditional && !in_system_header
1779 && TREE_CODE (olddecl) == FUNCTION_DECL
1780 && !TREE_PUBLIC (olddecl)
1781 && TREE_PUBLIC (newdecl))
1782 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1784 /* Warn when const declaration follows a non-const
1785 declaration, but not for functions. */
1786 if (TREE_CODE (olddecl) != FUNCTION_DECL
1787 && !TREE_READONLY (olddecl)
1788 && TREE_READONLY (newdecl))
1789 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1790 /* These bits are logically part of the type, for variables.
1791 But not for functions
1792 (where qualifiers are not valid ANSI anyway). */
1793 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1794 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1795 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1796 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1800 /* Optionally warn about more than one declaration for the same name. */
1801 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1802 /* Don't warn about a function declaration
1803 followed by a definition. */
1804 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1805 && DECL_INITIAL (olddecl) == 0)
1806 /* Don't warn about extern decl followed by (tentative) definition. */
1807 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1809 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1810 warning_with_decl (olddecl, "previous declaration of `%s'");
1813 /* Copy all the DECL_... slots specified in the new decl
1814 except for any that we copy here from the old type.
1816 Past this point, we don't change OLDTYPE and NEWTYPE
1817 even if we change the types of NEWDECL and OLDDECL. */
1821 /* When copying info to olddecl, we store into write_olddecl
1822 instead. This allows us to avoid modifying olddecl when
1823 different_binding_level is true. */
1824 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1826 /* Merge the data types specified in the two decls. */
1827 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1829 if (different_binding_level)
1831 = build_type_attribute_variant
1833 merge_attributes (TYPE_ATTRIBUTES (newtype),
1834 TYPE_ATTRIBUTES (oldtype)));
1837 = TREE_TYPE (olddecl)
1838 = common_type (newtype, oldtype);
1841 /* Lay the type out, unless already done. */
1842 if (oldtype != TREE_TYPE (newdecl))
1844 if (TREE_TYPE (newdecl) != error_mark_node)
1845 layout_type (TREE_TYPE (newdecl));
1846 if (TREE_CODE (newdecl) != FUNCTION_DECL
1847 && TREE_CODE (newdecl) != TYPE_DECL
1848 && TREE_CODE (newdecl) != CONST_DECL)
1849 layout_decl (newdecl, 0);
1853 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1854 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1855 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1856 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1857 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1858 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1860 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1861 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1865 /* Keep the old rtl since we can safely use it. */
1866 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1868 /* Merge the type qualifiers. */
1869 if (TREE_CODE (olddecl) == FUNCTION_DECL
1870 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1871 && ! TREE_THIS_VOLATILE (newdecl))
1872 TREE_THIS_VOLATILE (write_olddecl) = 0;
1874 if (TREE_READONLY (newdecl))
1875 TREE_READONLY (write_olddecl) = 1;
1877 if (TREE_THIS_VOLATILE (newdecl))
1879 TREE_THIS_VOLATILE (write_olddecl) = 1;
1880 if (TREE_CODE (newdecl) == VAR_DECL
1881 /* If an automatic variable is re-declared in the same
1882 function scope, but the old declaration was not
1883 volatile, make_var_volatile() would crash because the
1884 variable would have been assigned to a pseudo, not a
1885 MEM. Since this duplicate declaration is invalid
1886 anyway, we just skip the call. */
1888 make_var_volatile (newdecl);
1891 /* Keep source location of definition rather than declaration. */
1892 /* When called with different_binding_level set, keep the old
1893 information so that meaningful diagnostics can be given. */
1894 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1895 && ! different_binding_level)
1897 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1898 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1901 /* Merge the unused-warning information. */
1902 if (DECL_IN_SYSTEM_HEADER (olddecl))
1903 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1904 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1905 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1907 /* Merge the initialization information. */
1908 /* When called with different_binding_level set, don't copy over
1909 DECL_INITIAL, so that we don't accidentally change function
1910 declarations into function definitions. */
1911 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1912 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1914 /* Merge the section attribute.
1915 We want to issue an error if the sections conflict but that must be
1916 done later in decl_attributes since we are called before attributes
1918 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1919 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1921 /* Copy the assembler name.
1922 Currently, it can only be defined in the prototype. */
1923 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1925 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1927 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1928 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1930 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1931 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1932 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1933 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1934 DECL_NO_LIMIT_STACK (newdecl)
1935 |= DECL_NO_LIMIT_STACK (olddecl);
1938 /* If cannot merge, then use the new type and qualifiers,
1939 and don't preserve the old rtl. */
1940 else if (! different_binding_level)
1942 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1943 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1944 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1945 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1948 /* Merge the storage class information. */
1949 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1950 /* For functions, static overrides non-static. */
1951 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1953 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1954 /* This is since we don't automatically
1955 copy the attributes of NEWDECL into OLDDECL. */
1956 /* No need to worry about different_binding_level here because
1957 then TREE_PUBLIC (newdecl) was true. */
1958 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1959 /* If this clears `static', clear it in the identifier too. */
1960 if (! TREE_PUBLIC (olddecl))
1961 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1963 if (DECL_EXTERNAL (newdecl))
1965 if (! different_binding_level)
1967 /* Don't mess with these flags on local externs; they remain
1968 external even if there's a declaration at file scope which
1970 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1971 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1973 /* An extern decl does not override previous storage class. */
1974 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1975 if (! DECL_EXTERNAL (newdecl))
1976 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1980 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1981 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1986 /* If either decl says `inline', this fn is inline,
1987 unless its definition was passed already. */
1988 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1989 DECL_INLINE (olddecl) = 1;
1991 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1993 if (DECL_BUILT_IN (olddecl))
1995 /* Get rid of any built-in function if new arg types don't match it
1996 or if we have a function definition. */
1997 if (! types_match || new_is_definition)
1999 if (! different_binding_level)
2001 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2002 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2007 /* If redeclaring a builtin function, and not a definition,
2008 it stays built in. */
2009 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2010 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2013 /* Also preserve various other info from the definition. */
2014 else if (! new_is_definition)
2015 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2016 if (! new_is_definition)
2018 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2019 /* When called with different_binding_level set, don't copy over
2020 DECL_INITIAL, so that we don't accidentally change function
2021 declarations into function definitions. */
2022 if (! different_binding_level)
2023 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2024 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2025 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2026 if (DECL_INLINE (newdecl))
2027 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2030 if (different_binding_level)
2033 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2034 But preserve OLDDECL's DECL_UID. */
2036 register unsigned olddecl_uid = DECL_UID (olddecl);
2038 bcopy ((char *) newdecl + sizeof (struct tree_common),
2039 (char *) olddecl + sizeof (struct tree_common),
2040 sizeof (struct tree_decl) - sizeof (struct tree_common));
2041 DECL_UID (olddecl) = olddecl_uid;
2044 /* NEWDECL contains the merged attribute lists.
2045 Update OLDDECL to be the same. */
2046 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2051 /* Record a decl-node X as belonging to the current lexical scope.
2052 Check for errors (such as an incompatible declaration for the same
2053 name already seen in the same scope).
2055 Returns either X or an old decl for the same name.
2056 If an old decl is returned, it may have been smashed
2057 to agree with what X says. */
2064 register tree name = DECL_NAME (x);
2065 register struct binding_level *b = current_binding_level;
2067 DECL_CONTEXT (x) = current_function_decl;
2068 /* A local extern declaration for a function doesn't constitute nesting.
2069 A local auto declaration does, since it's a forward decl
2070 for a nested function coming later. */
2071 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2072 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2073 DECL_CONTEXT (x) = 0;
2075 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2076 && x != IDENTIFIER_IMPLICIT_DECL (name)
2077 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2078 && !DECL_IN_SYSTEM_HEADER (x))
2079 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2085 int different_binding_level = 0;
2087 t = lookup_name_current_level (name);
2088 /* Don't type check externs here when -traditional. This is so that
2089 code with conflicting declarations inside blocks will get warnings
2090 not errors. X11 for instance depends on this. */
2091 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2093 t = IDENTIFIER_GLOBAL_VALUE (name);
2094 /* Type decls at global scope don't conflict with externs declared
2095 inside lexical blocks. */
2096 if (t && TREE_CODE (t) == TYPE_DECL)
2098 different_binding_level = 1;
2100 if (t != 0 && t == error_mark_node)
2101 /* error_mark_node is 0 for a while during initialization! */
2104 error_with_decl (x, "`%s' used prior to declaration");
2109 file = DECL_SOURCE_FILE (t);
2110 line = DECL_SOURCE_LINE (t);
2113 /* If this decl is `static' and an implicit decl was seen previously,
2114 warn. But don't complain if -traditional,
2115 since traditional compilers don't complain. */
2116 if (! flag_traditional && TREE_PUBLIC (name)
2117 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2118 sets this for all functions. */
2119 && ! TREE_PUBLIC (x)
2120 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2121 /* We used to warn also for explicit extern followed by static,
2122 but sometimes you need to do it that way. */
2123 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2125 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2126 IDENTIFIER_POINTER (name));
2127 pedwarn_with_file_and_line
2128 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2129 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2130 "previous declaration of `%s'",
2131 IDENTIFIER_POINTER (name));
2132 TREE_THIS_VOLATILE (name) = 1;
2135 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2137 if (TREE_CODE (t) == PARM_DECL)
2139 /* Don't allow more than one "real" duplicate
2140 of a forward parm decl. */
2141 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2147 /* If we are processing a typedef statement, generate a whole new
2148 ..._TYPE node (which will be just an variant of the existing
2149 ..._TYPE node with identical properties) and then install the
2150 TYPE_DECL node generated to represent the typedef name as the
2151 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2153 The whole point here is to end up with a situation where each
2154 and every ..._TYPE node the compiler creates will be uniquely
2155 associated with AT MOST one node representing a typedef name.
2156 This way, even though the compiler substitutes corresponding
2157 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2158 early on, later parts of the compiler can always do the reverse
2159 translation and get back the corresponding typedef name. For
2162 typedef struct S MY_TYPE;
2165 Later parts of the compiler might only know that `object' was of
2166 type `struct S' if it were not for code just below. With this
2167 code however, later parts of the compiler see something like:
2169 struct S' == struct S
2170 typedef struct S' MY_TYPE;
2173 And they can then deduce (from the node for type struct S') that
2174 the original object declaration was:
2178 Being able to do this is important for proper support of protoize,
2179 and also for generating precise symbolic debugging information
2180 which takes full account of the programmer's (typedef) vocabulary.
2182 Obviously, we don't want to generate a duplicate ..._TYPE node if
2183 the TYPE_DECL node that we are now processing really represents a
2184 standard built-in type.
2186 Since all standard types are effectively declared at line zero
2187 in the source file, we can easily check to see if we are working
2188 on a standard type by checking the current value of lineno. */
2190 if (TREE_CODE (x) == TYPE_DECL)
2192 if (DECL_SOURCE_LINE (x) == 0)
2194 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2195 TYPE_NAME (TREE_TYPE (x)) = x;
2197 else if (TREE_TYPE (x) != error_mark_node
2198 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2200 tree tt = TREE_TYPE (x);
2201 DECL_ORIGINAL_TYPE (x) = tt;
2202 tt = build_type_copy (tt);
2204 TREE_USED (tt) = TREE_USED (x);
2209 /* Multiple external decls of the same identifier ought to match.
2210 Check against both global declarations (when traditional) and out of
2211 scope (limbo) block level declarations.
2213 We get warnings about inline functions where they are defined.
2214 Avoid duplicate warnings where they are used. */
2216 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2220 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2221 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2222 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2223 decl = IDENTIFIER_GLOBAL_VALUE (name);
2224 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2225 /* Decls in limbo are always extern, so no need to check that. */
2226 decl = IDENTIFIER_LIMBO_VALUE (name);
2230 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2231 /* If old decl is built-in, we already warned if we should. */
2232 && !DECL_BUILT_IN (decl))
2234 pedwarn_with_decl (x,
2235 "type mismatch with previous external decl");
2236 pedwarn_with_decl (decl, "previous external decl of `%s'");
2240 /* If a function has had an implicit declaration, and then is defined,
2241 make sure they are compatible. */
2243 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2244 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2245 && TREE_CODE (x) == FUNCTION_DECL
2246 && ! comptypes (TREE_TYPE (x),
2247 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2249 warning_with_decl (x, "type mismatch with previous implicit declaration");
2250 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2251 "previous implicit declaration of `%s'");
2254 /* In PCC-compatibility mode, extern decls of vars with no current decl
2255 take effect at top level no matter where they are. */
2256 if (flag_traditional && DECL_EXTERNAL (x)
2257 && lookup_name (name) == 0)
2259 tree type = TREE_TYPE (x);
2261 /* But don't do this if the type contains temporary nodes. */
2264 if (type == error_mark_node)
2266 if (TYPE_CONTEXT (type))
2268 warning_with_decl (x, "type of external `%s' is not global");
2269 /* By exiting the loop early, we leave TYPE nonzero,
2270 and thus prevent globalization of the decl. */
2273 else if (TREE_CODE (type) == FUNCTION_TYPE
2274 && TYPE_ARG_TYPES (type) != 0)
2275 /* The types might not be truly local,
2276 but the list of arg types certainly is temporary.
2277 Since prototypes are nontraditional,
2278 ok not to do the traditional thing. */
2280 type = TREE_TYPE (type);
2284 b = global_binding_level;
2287 /* This name is new in its binding level.
2288 Install the new declaration and return it. */
2289 if (b == global_binding_level)
2291 /* Install a global value. */
2293 /* If the first global decl has external linkage,
2294 warn if we later see static one. */
2295 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2296 TREE_PUBLIC (name) = 1;
2298 IDENTIFIER_GLOBAL_VALUE (name) = x;
2300 /* We no longer care about any previous block level declarations. */
2301 IDENTIFIER_LIMBO_VALUE (name) = 0;
2303 /* Don't forget if the function was used via an implicit decl. */
2304 if (IDENTIFIER_IMPLICIT_DECL (name)
2305 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2306 TREE_USED (x) = 1, TREE_USED (name) = 1;
2308 /* Don't forget if its address was taken in that way. */
2309 if (IDENTIFIER_IMPLICIT_DECL (name)
2310 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2311 TREE_ADDRESSABLE (x) = 1;
2313 /* Warn about mismatches against previous implicit decl. */
2314 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2315 /* If this real decl matches the implicit, don't complain. */
2316 && ! (TREE_CODE (x) == FUNCTION_DECL
2317 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2318 == integer_type_node)))
2319 pedwarn ("`%s' was previously implicitly declared to return `int'",
2320 IDENTIFIER_POINTER (name));
2322 /* If this decl is `static' and an `extern' was seen previously,
2323 that is erroneous. */
2324 if (TREE_PUBLIC (name)
2325 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2327 /* Okay to redeclare an ANSI built-in as static. */
2328 if (t != 0 && DECL_BUILT_IN (t))
2330 /* Okay to declare a non-ANSI built-in as anything. */
2331 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2333 /* Okay to have global type decl after an earlier extern
2334 declaration inside a lexical block. */
2335 else if (TREE_CODE (x) == TYPE_DECL)
2337 else if (IDENTIFIER_IMPLICIT_DECL (name))
2339 if (! TREE_THIS_VOLATILE (name))
2340 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2341 IDENTIFIER_POINTER (name));
2344 pedwarn ("`%s' was declared `extern' and later `static'",
2345 IDENTIFIER_POINTER (name));
2350 /* Here to install a non-global value. */
2351 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2352 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2354 IDENTIFIER_LOCAL_VALUE (name) = x;
2356 /* If this is an extern function declaration, see if we
2357 have a global definition or declaration for the function. */
2360 && TREE_CODE (x) == FUNCTION_DECL
2361 && TREE_CODE (oldglobal) == FUNCTION_DECL
2362 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2364 /* We have one. Their types must agree. */
2365 if (! comptypes (TREE_TYPE (x),
2366 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2367 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2370 /* Inner extern decl is inline if global one is.
2371 Copy enough to really inline it. */
2372 if (DECL_INLINE (oldglobal))
2374 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2375 DECL_INITIAL (x) = (current_function_decl == oldglobal
2376 ? 0 : DECL_INITIAL (oldglobal));
2377 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2378 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2379 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2380 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2381 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2382 DECL_ABSTRACT_ORIGIN (x)
2383 = DECL_ABSTRACT_ORIGIN (oldglobal);
2385 /* Inner extern decl is built-in if global one is. */
2386 if (DECL_BUILT_IN (oldglobal))
2388 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2389 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2391 /* Keep the arg types from a file-scope fcn defn. */
2392 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2393 && DECL_INITIAL (oldglobal)
2394 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2395 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2400 /* This case is probably sometimes the right thing to do. */
2401 /* If we have a local external declaration,
2402 then any file-scope declaration should not
2403 have been static. */
2404 if (oldlocal == 0 && oldglobal != 0
2405 && !TREE_PUBLIC (oldglobal)
2406 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2407 warning ("`%s' locally external but globally static",
2408 IDENTIFIER_POINTER (name));
2411 /* If we have a local external declaration,
2412 and no file-scope declaration has yet been seen,
2413 then if we later have a file-scope decl it must not be static. */
2415 && DECL_EXTERNAL (x)
2419 TREE_PUBLIC (name) = 1;
2421 /* Save this decl, so that we can do type checking against
2422 other decls after it falls out of scope.
2424 Only save it once. This prevents temporary decls created in
2425 expand_inline_function from being used here, since this
2426 will have been set when the inline function was parsed.
2427 It also helps give slightly better warnings. */
2428 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2429 IDENTIFIER_LIMBO_VALUE (name) = x;
2432 /* Warn if shadowing an argument at the top level of the body. */
2433 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2434 /* This warning doesn't apply to the parms of a nested fcn. */
2435 && ! current_binding_level->parm_flag
2436 /* Check that this is one level down from the parms. */
2437 && current_binding_level->level_chain->parm_flag
2438 /* Check that the decl being shadowed
2439 comes from the parm level, one level up. */
2440 && chain_member (oldlocal, current_binding_level->level_chain->names))
2442 if (TREE_CODE (oldlocal) == PARM_DECL)
2443 pedwarn ("declaration of `%s' shadows a parameter",
2444 IDENTIFIER_POINTER (name));
2446 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2447 IDENTIFIER_POINTER (name));
2450 /* Maybe warn if shadowing something else. */
2451 else if (warn_shadow && !DECL_EXTERNAL (x)
2452 /* No shadow warnings for internally generated vars. */
2453 && DECL_SOURCE_LINE (x) != 0
2454 /* No shadow warnings for vars made for inlining. */
2455 && ! DECL_FROM_INLINE (x))
2457 const char *id = IDENTIFIER_POINTER (name);
2459 if (TREE_CODE (x) == PARM_DECL
2460 && current_binding_level->level_chain->parm_flag)
2461 /* Don't warn about the parm names in function declarator
2462 within a function declarator.
2463 It would be nice to avoid warning in any function
2464 declarator in a declaration, as opposed to a definition,
2465 but there is no way to tell it's not a definition. */
2467 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2468 warning ("declaration of `%s' shadows a parameter", id);
2469 else if (oldlocal != 0)
2470 warning ("declaration of `%s' shadows previous local", id);
2471 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2472 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2473 warning ("declaration of `%s' shadows global declaration", id);
2476 /* If storing a local value, there may already be one (inherited).
2477 If so, record it for restoration when this binding level ends. */
2479 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2482 /* Keep count of variables in this level with incomplete type.
2483 If the input is erroneous, we can have error_mark in the type
2484 slot (e.g. "f(void a, ...)") - that doesn't count as an
2486 if (TREE_TYPE (x) != error_mark_node
2487 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2491 /* Put decls on list in reverse order.
2492 We will reverse them later if necessary. */
2493 TREE_CHAIN (x) = b->names;
2499 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2502 pushdecl_top_level (x)
2506 register struct binding_level *b = current_binding_level;
2508 current_binding_level = global_binding_level;
2510 current_binding_level = b;
2514 /* Generate an implicit declaration for identifier FUNCTIONID
2515 as a function of type int (). Print a warning if appropriate. */
2518 implicitly_declare (functionid)
2522 int traditional_warning = 0;
2523 /* Only one "implicit declaration" warning per identifier. */
2524 int implicit_warning;
2526 /* We used to reuse an old implicit decl here,
2527 but this loses with inline functions because it can clobber
2528 the saved decl chains. */
2530 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2531 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2534 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2536 /* Warn of implicit decl following explicit local extern decl.
2537 This is probably a program designed for traditional C. */
2538 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2539 traditional_warning = 1;
2541 /* Warn once of an implicit declaration. */
2542 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2544 DECL_EXTERNAL (decl) = 1;
2545 TREE_PUBLIC (decl) = 1;
2547 /* Record that we have an implicit decl and this is it. */
2548 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2550 /* ANSI standard says implicit declarations are in the innermost block.
2551 So we record the decl in the standard fashion.
2552 If flag_traditional is set, pushdecl does it top-level. */
2555 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2556 maybe_objc_check_decl (decl);
2558 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2560 if (implicit_warning)
2561 implicit_decl_warning (functionid);
2562 else if (warn_traditional && traditional_warning)
2563 warning ("function `%s' was previously declared within a block",
2564 IDENTIFIER_POINTER (functionid));
2566 /* Write a record describing this implicit function declaration to the
2567 prototypes file (if requested). */
2569 gen_aux_info_record (decl, 0, 1, 0);
2575 implicit_decl_warning (id)
2578 const char *name = IDENTIFIER_POINTER (id);
2579 if (mesg_implicit_function_declaration == 2)
2580 error ("implicit declaration of function `%s'", name);
2581 else if (mesg_implicit_function_declaration == 1)
2582 warning ("implicit declaration of function `%s'", name);
2585 /* Return zero if the declaration NEWDECL is valid
2586 when the declaration OLDDECL (assumed to be for the same name)
2587 has already been seen.
2588 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2589 and 3 if it is a conflicting declaration. */
2592 redeclaration_error_message (newdecl, olddecl)
2593 tree newdecl, olddecl;
2595 if (TREE_CODE (newdecl) == TYPE_DECL)
2597 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2599 /* pushdecl creates distinct types for TYPE_DECLs by calling
2600 build_type_copy, so the above comparison generally fails. We do
2601 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2602 is equivalent to what this code used to do before the build_type_copy
2603 call. The variant type distinction should not matter for traditional
2604 code, because it doesn't have type qualifiers. */
2605 if (flag_traditional
2606 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2608 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2612 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2614 /* Declarations of functions can insist on internal linkage
2615 but they can't be inconsistent with internal linkage,
2616 so there can be no error on that account.
2617 However defining the same name twice is no good. */
2618 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2619 /* However, defining once as extern inline and a second
2620 time in another way is ok. */
2621 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2622 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2626 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2628 /* Objects declared at top level: */
2629 /* If at least one is a reference, it's ok. */
2630 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2632 /* Reject two definitions. */
2633 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2635 /* Now we have two tentative defs, or one tentative and one real def. */
2636 /* Insist that the linkage match. */
2637 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2641 else if (current_binding_level->parm_flag
2642 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2646 /* Newdecl has block scope. If olddecl has block scope also, then
2647 reject two definitions, and reject a definition together with an
2648 external reference. Otherwise, it is OK, because newdecl must
2649 be an extern reference to olddecl. */
2650 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2651 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2657 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2658 Create one if none exists so far for the current function.
2659 This function is called for both label definitions and label references. */
2665 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2667 if (current_function_decl == 0)
2669 error ("label %s referenced outside of any function",
2670 IDENTIFIER_POINTER (id));
2674 /* Use a label already defined or ref'd with this name. */
2677 /* But not if it is inherited and wasn't declared to be inheritable. */
2678 if (DECL_CONTEXT (decl) != current_function_decl
2679 && ! C_DECLARED_LABEL_FLAG (decl))
2680 return shadow_label (id);
2684 decl = build_decl (LABEL_DECL, id, void_type_node);
2686 /* A label not explicitly declared must be local to where it's ref'd. */
2687 DECL_CONTEXT (decl) = current_function_decl;
2689 DECL_MODE (decl) = VOIDmode;
2691 /* Say where one reference is to the label,
2692 for the sake of the error if it is not defined. */
2693 DECL_SOURCE_LINE (decl) = lineno;
2694 DECL_SOURCE_FILE (decl) = input_filename;
2696 IDENTIFIER_LABEL_VALUE (id) = decl;
2698 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2703 /* Make a label named NAME in the current function,
2704 shadowing silently any that may be inherited from containing functions
2705 or containing scopes.
2707 Note that valid use, if the label being shadowed
2708 comes from another scope in the same function,
2709 requires calling declare_nonlocal_label right away. */
2715 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2721 /* Check to make sure that the label hasn't already been declared
2722 at this label scope */
2723 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2724 if (TREE_VALUE (dup) == decl)
2726 error ("duplicate label declaration `%s'",
2727 IDENTIFIER_POINTER (name));
2728 error_with_decl (TREE_VALUE (dup),
2729 "this is a previous declaration");
2730 /* Just use the previous declaration. */
2731 return lookup_label (name);
2734 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2735 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2738 return lookup_label (name);
2741 /* Define a label, specifying the location in the source file.
2742 Return the LABEL_DECL node for the label, if the definition is valid.
2743 Otherwise return 0. */
2746 define_label (filename, line, name)
2747 const char *filename;
2751 tree decl = lookup_label (name);
2753 /* If label with this name is known from an outer context, shadow it. */
2754 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2756 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2757 IDENTIFIER_LABEL_VALUE (name) = 0;
2758 decl = lookup_label (name);
2761 if (warn_traditional && !in_system_header && lookup_name (name))
2762 warning_with_file_and_line (filename, line,
2763 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2764 IDENTIFIER_POINTER (name));
2766 if (DECL_INITIAL (decl) != 0)
2768 error_with_file_and_line (filename, line, "duplicate label `%s'",
2769 IDENTIFIER_POINTER (name));
2774 /* Mark label as having been defined. */
2775 DECL_INITIAL (decl) = error_mark_node;
2776 /* Say where in the source. */
2777 DECL_SOURCE_FILE (decl) = filename;
2778 DECL_SOURCE_LINE (decl) = line;
2783 /* Return the list of declarations of the current level.
2784 Note that this list is in reverse order unless/until
2785 you nreverse it; and when you do nreverse it, you must
2786 store the result back using `storedecls' or you will lose. */
2791 return current_binding_level->names;
2794 /* Return the list of type-tags (for structs, etc) of the current level. */
2799 return current_binding_level->tags;
2802 /* Store the list of declarations of the current level.
2803 This is done for the parameter declarations of a function being defined,
2804 after they are modified in the light of any missing parameters. */
2810 current_binding_level->names = decls;
2813 /* Similarly, store the list of tags of the current level. */
2819 current_binding_level->tags = tags;
2822 /* Given NAME, an IDENTIFIER_NODE,
2823 return the structure (or union or enum) definition for that name.
2824 Searches binding levels from BINDING_LEVEL up to the global level.
2825 If THISLEVEL_ONLY is nonzero, searches only the specified context
2826 (but skips any tag-transparent contexts to find one that is
2827 meaningful for tags).
2828 CODE says which kind of type the caller wants;
2829 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2830 If the wrong kind of type is found, an error is reported. */
2833 lookup_tag (code, name, binding_level, thislevel_only)
2834 enum tree_code code;
2835 struct binding_level *binding_level;
2839 register struct binding_level *level;
2841 for (level = binding_level; level; level = level->level_chain)
2844 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2846 if (TREE_PURPOSE (tail) == name)
2848 if (TREE_CODE (TREE_VALUE (tail)) != code)
2850 /* Definition isn't the kind we were looking for. */
2851 pending_invalid_xref = name;
2852 pending_invalid_xref_file = input_filename;
2853 pending_invalid_xref_line = lineno;
2855 return TREE_VALUE (tail);
2858 if (thislevel_only && ! level->tag_transparent)
2864 /* Print an error message now
2865 for a recent invalid struct, union or enum cross reference.
2866 We don't print them immediately because they are not invalid
2867 when used in the `struct foo;' construct for shadowing. */
2870 pending_xref_error ()
2872 if (pending_invalid_xref != 0)
2873 error_with_file_and_line (pending_invalid_xref_file,
2874 pending_invalid_xref_line,
2875 "`%s' defined as wrong kind of tag",
2876 IDENTIFIER_POINTER (pending_invalid_xref));
2877 pending_invalid_xref = 0;
2880 /* Given a type, find the tag that was defined for it and return the tag name.
2881 Otherwise return 0. */
2884 lookup_tag_reverse (type)
2887 register struct binding_level *level;
2889 for (level = current_binding_level; level; level = level->level_chain)
2892 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2894 if (TREE_VALUE (tail) == type)
2895 return TREE_PURPOSE (tail);
2901 /* Look up NAME in the current binding level and its superiors
2902 in the namespace of variables, functions and typedefs.
2903 Return a ..._DECL node of some kind representing its definition,
2904 or return 0 if it is undefined. */
2912 if (current_binding_level != global_binding_level
2913 && IDENTIFIER_LOCAL_VALUE (name))
2914 val = IDENTIFIER_LOCAL_VALUE (name);
2916 val = IDENTIFIER_GLOBAL_VALUE (name);
2920 /* Similar to `lookup_name' but look only at current binding level. */
2923 lookup_name_current_level (name)
2928 if (current_binding_level == global_binding_level)
2929 return IDENTIFIER_GLOBAL_VALUE (name);
2931 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2934 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2935 if (DECL_NAME (t) == name)
2941 /* Mark ARG for GC. */
2944 mark_binding_level (arg)
2947 struct binding_level *level = *(struct binding_level **) arg;
2949 for (; level != 0; level = level->level_chain)
2951 ggc_mark_tree (level->names);
2952 ggc_mark_tree (level->tags);
2953 ggc_mark_tree (level->shadowed);
2954 ggc_mark_tree (level->blocks);
2955 ggc_mark_tree (level->this_block);
2956 ggc_mark_tree (level->parm_order);
2960 /* Create the predefined scalar types of C,
2961 and some nodes representing standard constants (0, 1, (void *) 0).
2962 Initialize the global binding level.
2963 Make definitions for built-in primitive functions. */
2966 init_decl_processing ()
2968 register tree endlink;
2969 tree ptr_ftype_void, ptr_ftype_ptr;
2970 int wchar_type_size;
2971 tree array_domain_type;
2974 current_function_decl = NULL;
2975 named_labels = NULL;
2976 current_binding_level = NULL_BINDING_LEVEL;
2977 free_binding_level = NULL_BINDING_LEVEL;
2979 /* Make the binding_level structure for global names. */
2981 global_binding_level = current_binding_level;
2983 build_common_tree_nodes (flag_signed_char);
2985 /* Define `int' and `char' first so that dbx will output them first. */
2986 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2987 integer_type_node));
2988 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2991 long_integer_type_node));
2992 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2993 unsigned_type_node));
2994 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2995 long_unsigned_type_node));
2996 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2997 long_long_integer_type_node));
2998 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2999 long_long_unsigned_type_node));
3000 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3001 short_integer_type_node));
3002 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3003 short_unsigned_type_node));
3004 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3005 signed_char_type_node));
3006 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3007 unsigned_char_type_node));
3008 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3009 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3010 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3011 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3012 #if HOST_BITS_PER_WIDE_INT >= 64
3013 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3015 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3016 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3018 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3019 #if HOST_BITS_PER_WIDE_INT >= 64
3020 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3023 /* `unsigned long' is the standard type for sizeof.
3024 Traditionally, use a signed type.
3025 Note that stddef.h uses `unsigned long',
3026 and this must agree, even if long and int are the same size. */
3027 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3028 signed_size_type_node = signed_type (t);
3029 if (flag_traditional && TREE_UNSIGNED (t))
3030 t = signed_type (t);
3032 c_size_type_node = t;
3035 /* Create the widest literal types. */
3036 widest_integer_literal_type_node
3037 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3038 widest_unsigned_literal_type_node
3039 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3040 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3041 widest_integer_literal_type_node));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3043 widest_unsigned_literal_type_node));
3045 build_common_tree_nodes_2 (flag_short_double);
3047 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3049 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3051 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3052 long_double_type_node));
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3054 complex_integer_type_node));
3055 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3056 complex_float_type_node));
3057 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3058 complex_double_type_node));
3059 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3060 complex_long_double_type_node));
3061 pushdecl (build_decl (TYPE_DECL,
3062 ridpointers[(int) RID_VOID], void_type_node));
3064 #ifdef MD_INIT_BUILTINS
3068 wchar_type_node = get_identifier (flag_short_wchar
3069 ? "short unsigned int"
3071 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3072 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3073 signed_wchar_type_node = signed_type (wchar_type_node);
3074 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3077 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3079 boolean_type_node = integer_type_node;
3080 boolean_true_node = integer_one_node;
3081 boolean_false_node = integer_zero_node;
3083 string_type_node = build_pointer_type (char_type_node);
3084 const_string_type_node
3085 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3087 /* Make a type to be the domain of a few array types
3088 whose domains don't really matter.
3089 200 is small enough that it always fits in size_t
3090 and large enough that it can hold most function names for the
3091 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3092 array_domain_type = build_index_type (build_int_2 (200, 0));
3094 /* make a type for arrays of characters.
3095 With luck nothing will ever really depend on the length of this
3097 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3099 /* Likewise for arrays of ints. */
3101 = build_array_type (integer_type_node, array_domain_type);
3103 /* This is for wide string constants. */
3104 wchar_array_type_node
3105 = build_array_type (wchar_type_node, array_domain_type);
3107 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3109 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3111 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3112 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3114 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3116 endlink = void_list_node;
3117 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3119 = build_function_type (ptr_type_node,
3120 tree_cons (NULL_TREE, ptr_type_node, endlink));
3122 /* Types which are common to the fortran compiler and libf2c. When
3123 changing these, you also need to be concerned with f/com.h. */
3125 if (TYPE_PRECISION (float_type_node)
3126 == TYPE_PRECISION (long_integer_type_node))
3128 g77_integer_type_node = long_integer_type_node;
3129 g77_uinteger_type_node = long_unsigned_type_node;
3131 else if (TYPE_PRECISION (float_type_node)
3132 == TYPE_PRECISION (integer_type_node))
3134 g77_integer_type_node = integer_type_node;
3135 g77_uinteger_type_node = unsigned_type_node;
3138 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3140 if (g77_integer_type_node != NULL_TREE)
3142 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3143 g77_integer_type_node));
3144 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3145 g77_uinteger_type_node));
3148 if (TYPE_PRECISION (float_type_node) * 2
3149 == TYPE_PRECISION (long_integer_type_node))
3151 g77_longint_type_node = long_integer_type_node;
3152 g77_ulongint_type_node = long_unsigned_type_node;
3154 else if (TYPE_PRECISION (float_type_node) * 2
3155 == TYPE_PRECISION (long_long_integer_type_node))
3157 g77_longint_type_node = long_long_integer_type_node;
3158 g77_ulongint_type_node = long_long_unsigned_type_node;
3161 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3163 if (g77_longint_type_node != NULL_TREE)
3165 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3166 g77_longint_type_node));
3167 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3168 g77_ulongint_type_node));
3171 builtin_function ("__builtin_aggregate_incoming_address",
3172 build_function_type (ptr_type_node, NULL_TREE),
3173 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3174 BUILT_IN_NORMAL, NULL_PTR);
3176 /* Hooks for the DWARF 2 __throw routine. */
3177 builtin_function ("__builtin_unwind_init",
3178 build_function_type (void_type_node, endlink),
3179 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3180 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3181 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3182 builtin_function ("__builtin_dwarf_fp_regnum",
3183 build_function_type (unsigned_type_node, endlink),
3184 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3185 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3186 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3187 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3188 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3189 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3190 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3192 ("__builtin_eh_return",
3193 build_function_type (void_type_node,
3194 tree_cons (NULL_TREE, ptr_type_node,
3195 tree_cons (NULL_TREE,
3196 type_for_mode (ptr_mode, 0),
3197 tree_cons (NULL_TREE,
3200 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3202 pedantic_lvalues = pedantic;
3204 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3206 function_id_node = get_identifier ("__FUNCTION__");
3207 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3208 func_id_node = get_identifier ("__func__");
3209 make_fname_decl = c_make_fname_decl;
3210 declare_function_name ();
3212 start_identifier_warnings ();
3214 /* Prepare to check format strings against argument lists. */
3215 init_function_format_info ();
3217 incomplete_decl_finalize_hook = finish_incomplete_decl;
3219 /* Record our roots. */
3221 ggc_add_tree_root (c_global_trees, CTI_MAX);
3222 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3223 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3224 ggc_add_tree_root (&named_labels, 1);
3225 ggc_add_tree_root (&shadowed_labels, 1);
3226 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3227 mark_binding_level);
3228 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3229 mark_binding_level);
3230 ggc_add_tree_root (&static_ctors, 1);
3231 ggc_add_tree_root (&static_dtors, 1);
3234 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3235 decl, NAME is the initialization string and TYPE_DEP indicates whether
3236 NAME depended on the type of the function. As we don't yet implement
3237 delayed emission of static data, we mark the decl as emitted
3238 so it is not placed in the output. Anything using it must therefore pull
3239 out the STRING_CST initializer directly. This does mean that these names
3240 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3243 c_make_fname_decl (id, name, type_dep)
3246 int type_dep ATTRIBUTE_UNUSED;
3248 tree decl, type, init;
3249 size_t length = strlen (name);
3251 type = build_array_type
3252 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3253 build_index_type (build_int_2 (length, 0)));
3255 decl = build_decl (VAR_DECL, id, type);
3256 TREE_STATIC (decl) = 1;
3257 TREE_READONLY (decl) = 1;
3258 TREE_ASM_WRITTEN (decl) = 1;
3259 DECL_SOURCE_LINE (decl) = 0;
3260 DECL_ARTIFICIAL (decl) = 1;
3261 DECL_IN_SYSTEM_HEADER (decl) = 1;
3262 DECL_IGNORED_P (decl) = 1;
3263 init = build_string (length + 1, name);
3264 TREE_TYPE (init) = type;
3265 DECL_INITIAL (decl) = init;
3266 finish_decl (pushdecl (decl), init, NULL_TREE);
3271 /* Return a definition for a builtin function named NAME and whose data type
3272 is TYPE. TYPE should be a function type with argument types.
3273 FUNCTION_CODE tells later passes how to compile calls to this function.
3274 See tree.h for its possible values.
3276 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3277 the name to be called if we can't opencode the function. */
3280 builtin_function (name, type, function_code, class, library_name)
3284 enum built_in_class class;
3285 const char *library_name;
3287 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3288 DECL_EXTERNAL (decl) = 1;
3289 TREE_PUBLIC (decl) = 1;
3290 /* If -traditional, permit redefining a builtin function any way you like.
3291 (Though really, if the program redefines these functions,
3292 it probably won't work right unless compiled with -fno-builtin.) */
3293 if (flag_traditional && name[0] != '_')
3294 DECL_BUILT_IN_NONANSI (decl) = 1;
3296 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3297 make_decl_rtl (decl, NULL_PTR, 1);
3299 DECL_BUILT_IN_CLASS (decl) = class;
3300 DECL_FUNCTION_CODE (decl) = function_code;
3302 /* Warn if a function in the namespace for users
3303 is used without an occasion to consider it declared. */
3304 if (name[0] != '_' || name[1] != '_')
3305 C_DECL_ANTICIPATED (decl) = 1;
3310 /* Called when a declaration is seen that contains no names to declare.
3311 If its type is a reference to a structure, union or enum inherited
3312 from a containing scope, shadow that tag name for the current scope
3313 with a forward reference.
3314 If its type defines a new named structure or union
3315 or defines an enum, it is valid but we need not do anything here.
3316 Otherwise, it is an error. */
3319 shadow_tag (declspecs)
3322 shadow_tag_warned (declspecs, 0);
3326 shadow_tag_warned (declspecs, warned)
3329 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3336 pending_invalid_xref = 0;
3338 /* Remove the attributes from declspecs, since they will confuse the
3340 split_specs_attrs (declspecs, &specs, &attrs);
3342 for (link = specs; link; link = TREE_CHAIN (link))
3344 register tree value = TREE_VALUE (link);
3345 register enum tree_code code = TREE_CODE (value);
3347 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3348 /* Used to test also that TYPE_SIZE (value) != 0.
3349 That caused warning for `struct foo;' at top level in the file. */
3351 register tree name = lookup_tag_reverse (value);
3358 if (warned != 1 && code != ENUMERAL_TYPE)
3359 /* Empty unnamed enum OK */
3361 pedwarn ("unnamed struct/union that defines no instances");
3367 t = lookup_tag (code, name, current_binding_level, 1);
3371 t = make_node (code);
3378 if (!warned && ! in_system_header)
3380 warning ("useless keyword or type name in empty declaration");
3387 error ("two types specified in one empty declaration");
3392 pedwarn ("empty declaration");
3396 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3399 groktypename (typename)
3402 if (TREE_CODE (typename) != TREE_LIST)
3404 return grokdeclarator (TREE_VALUE (typename),
3405 TREE_PURPOSE (typename),
3409 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3412 groktypename_in_parm_context (typename)
3415 if (TREE_CODE (typename) != TREE_LIST)
3417 return grokdeclarator (TREE_VALUE (typename),
3418 TREE_PURPOSE (typename),
3422 /* Decode a declarator in an ordinary declaration or data definition.
3423 This is called as soon as the type information and variable name
3424 have been parsed, before parsing the initializer if any.
3425 Here we create the ..._DECL node, fill in its type,
3426 and put it on the list of decls for the current context.
3427 The ..._DECL node is returned as the value.
3429 Exception: for arrays where the length is not specified,
3430 the type is left null, to be filled in by `finish_decl'.
3432 Function definitions do not come here; they go to start_function
3433 instead. However, external and forward declarations of functions
3434 do go through here. Structure field declarations are done by
3435 grokfield and not through here. */
3438 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3439 tree declarator, declspecs;
3441 tree attributes, prefix_attributes;
3443 register tree decl = grokdeclarator (declarator, declspecs,
3444 NORMAL, initialized);
3447 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3448 && MAIN_NAME_P (DECL_NAME (decl)))
3449 warning_with_decl (decl, "`%s' is usually a function");
3452 /* Is it valid for this decl to have an initializer at all?
3453 If not, set INITIALIZED to zero, which will indirectly
3454 tell `finish_decl' to ignore the initializer once it is parsed. */
3455 switch (TREE_CODE (decl))
3458 /* typedef foo = bar means give foo the same type as bar.
3459 We haven't parsed bar yet, so `finish_decl' will fix that up.
3460 Any other case of an initialization in a TYPE_DECL is an error. */
3461 if (pedantic || list_length (declspecs) > 1)
3463 error ("typedef `%s' is initialized",
3464 IDENTIFIER_POINTER (DECL_NAME (decl)));
3470 error ("function `%s' is initialized like a variable",
3471 IDENTIFIER_POINTER (DECL_NAME (decl)));
3476 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3477 error ("parameter `%s' is initialized",
3478 IDENTIFIER_POINTER (DECL_NAME (decl)));
3483 /* Don't allow initializations for incomplete types
3484 except for arrays which might be completed by the initialization. */
3485 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3487 /* A complete type is ok if size is fixed. */
3489 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3490 || C_DECL_VARIABLE_SIZE (decl))
3492 error ("variable-sized object may not be initialized");
3496 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3498 error ("variable `%s' has initializer but incomplete type",
3499 IDENTIFIER_POINTER (DECL_NAME (decl)));
3502 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3504 error ("elements of array `%s' have incomplete type",
3505 IDENTIFIER_POINTER (DECL_NAME (decl)));
3513 /* Seems redundant with grokdeclarator. */
3514 if (current_binding_level != global_binding_level
3515 && DECL_EXTERNAL (decl)
3516 && TREE_CODE (decl) != FUNCTION_DECL)
3517 warning ("declaration of `%s' has `extern' and is initialized",
3518 IDENTIFIER_POINTER (DECL_NAME (decl)));
3520 DECL_EXTERNAL (decl) = 0;
3521 if (current_binding_level == global_binding_level)
3522 TREE_STATIC (decl) = 1;
3524 /* Tell `pushdecl' this is an initialized decl
3525 even though we don't yet have the initializer expression.
3526 Also tell `finish_decl' it may store the real initializer. */
3527 DECL_INITIAL (decl) = error_mark_node;
3530 /* If this is a function declaration, write a record describing it to the
3531 prototypes file (if requested). */
3533 if (TREE_CODE (decl) == FUNCTION_DECL)
3534 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3536 /* ANSI specifies that a tentative definition which is not merged with
3537 a non-tentative definition behaves exactly like a definition with an
3538 initializer equal to zero. (Section 3.7.2)
3539 -fno-common gives strict ANSI behavior. Usually you don't want it.
3540 This matters only for variables with external linkage. */
3541 if (! flag_no_common || ! TREE_PUBLIC (decl))
3542 DECL_COMMON (decl) = 1;
3544 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3545 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3548 /* Set attributes here so if duplicate decl, will have proper attributes. */
3549 decl_attributes (decl, attributes, prefix_attributes);
3551 /* Add this decl to the current binding level.
3552 TEM may equal DECL or it may be a previous decl of the same name. */
3553 tem = pushdecl (decl);
3555 /* For a local variable, define the RTL now. */
3556 if (current_binding_level != global_binding_level
3557 /* But not if this is a duplicate decl
3558 and we preserved the rtl from the previous one
3559 (which may or may not happen). */
3560 && DECL_RTL (tem) == 0
3561 && !DECL_CONTEXT (tem))
3563 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3565 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3566 && DECL_INITIAL (tem) != 0)
3573 /* Finish processing of a declaration;
3574 install its initial value.
3575 If the length of an array type is not known before,
3576 it must be determined now, from the initial value, or it is an error. */
3579 finish_decl (decl, init, asmspec_tree)
3583 register tree type = TREE_TYPE (decl);
3584 int was_incomplete = (DECL_SIZE (decl) == 0);
3587 /* If a name was specified, get the string. */
3589 asmspec = TREE_STRING_POINTER (asmspec_tree);
3591 /* If `start_decl' didn't like having an initialization, ignore it now. */
3593 if (init != 0 && DECL_INITIAL (decl) == 0)
3595 /* Don't crash if parm is initialized. */
3596 if (TREE_CODE (decl) == PARM_DECL)
3601 if (TREE_CODE (decl) != TYPE_DECL)
3602 store_init_value (decl, init);
3605 /* typedef foo = bar; store the type of bar as the type of foo. */
3606 TREE_TYPE (decl) = TREE_TYPE (init);
3607 DECL_INITIAL (decl) = init = 0;
3611 /* Deduce size of array from initialization, if not already known */
3613 if (TREE_CODE (type) == ARRAY_TYPE
3614 && TYPE_DOMAIN (type) == 0
3615 && TREE_CODE (decl) != TYPE_DECL)
3618 = (TREE_STATIC (decl)
3619 /* Even if pedantic, an external linkage array
3620 may have incomplete type at first. */
3621 ? pedantic && !TREE_PUBLIC (decl)
3622 : !DECL_EXTERNAL (decl));
3624 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3626 /* Get the completed type made by complete_array_type. */
3627 type = TREE_TYPE (decl);
3630 error_with_decl (decl, "initializer fails to determine size of `%s'");
3635 error_with_decl (decl, "array size missing in `%s'");
3636 /* If a `static' var's size isn't known,
3637 make it extern as well as static, so it does not get
3639 If it is not `static', then do not mark extern;
3640 finish_incomplete_decl will give it a default size
3641 and it will get allocated. */
3642 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3643 DECL_EXTERNAL (decl) = 1;
3646 /* TYPE_MAX_VALUE is always one less than the number of elements
3647 in the array, because we start counting at zero. Therefore,
3648 warn only if the value is less than zero. */
3649 if (pedantic && TYPE_DOMAIN (type) != 0
3650 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3651 error_with_decl (decl, "zero or negative size array `%s'");
3653 layout_decl (decl, 0);
3656 if (TREE_CODE (decl) == VAR_DECL)
3658 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3659 layout_decl (decl, 0);
3661 if (DECL_SIZE (decl) == 0
3662 && (TREE_STATIC (decl)
3664 /* A static variable with an incomplete type
3665 is an error if it is initialized.
3666 Also if it is not file scope.
3667 Otherwise, let it through, but if it is not `extern'
3668 then it may cause an error message later. */
3669 (DECL_INITIAL (decl) != 0
3670 || DECL_CONTEXT (decl) != 0)
3672 /* An automatic variable with an incomplete type
3674 !DECL_EXTERNAL (decl)))
3676 error_with_decl (decl, "storage size of `%s' isn't known");
3677 TREE_TYPE (decl) = error_mark_node;
3680 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3681 && DECL_SIZE (decl) != 0)
3683 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3684 constant_expression_warning (DECL_SIZE (decl));
3686 error_with_decl (decl, "storage size of `%s' isn't constant");
3689 if (TREE_USED (type))
3690 TREE_USED (decl) = 1;
3693 /* If this is a function and an assembler name is specified, it isn't
3694 builtin any more. Also reset DECL_RTL so we can give it its new
3696 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3698 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3699 DECL_RTL (decl) = 0;
3700 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3703 /* Output the assembler code and/or RTL code for variables and functions,
3704 unless the type is an undefined structure or union.
3705 If not, it will get done when the type is completed. */
3707 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3709 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3710 maybe_objc_check_decl (decl);
3712 if (!DECL_CONTEXT (decl))
3713 rest_of_decl_compilation (decl, asmspec,
3714 (DECL_CONTEXT (decl) == 0
3715 || TREE_ASM_WRITTEN (decl)), 0);
3719 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3720 add_decl_stmt (decl);
3723 if (DECL_CONTEXT (decl) != 0)
3725 /* Recompute the RTL of a local array now
3726 if it used to be an incomplete type. */
3728 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3730 /* If we used it already as memory, it must stay in memory. */
3731 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3732 /* If it's still incomplete now, no init will save it. */
3733 if (DECL_SIZE (decl) == 0)
3734 DECL_INITIAL (decl) = 0;
3739 if (TREE_CODE (decl) == TYPE_DECL)
3741 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3742 maybe_objc_check_decl (decl);
3743 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3746 /* At the end of a declaration, throw away any variable type sizes
3747 of types defined inside that declaration. There is no use
3748 computing them in the following function definition. */
3749 if (current_binding_level == global_binding_level)
3750 get_pending_sizes ();
3753 /* If DECL has a cleanup, build and return that cleanup here.
3754 This is a callback called by expand_expr. */
3757 maybe_build_cleanup (decl)
3758 tree decl ATTRIBUTE_UNUSED;
3760 /* There are no cleanups in C. */
3764 /* Given a parsed parameter declaration,
3765 decode it into a PARM_DECL and push that on the current binding level.
3766 Also, for the sake of forward parm decls,
3767 record the given order of parms in `parm_order'. */
3770 push_parm_decl (parm)
3774 int old_immediate_size_expand = immediate_size_expand;
3775 /* Don't try computing parm sizes now -- wait till fn is called. */
3776 immediate_size_expand = 0;
3778 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3779 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3780 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3781 TREE_PURPOSE (TREE_VALUE (parm)));
3784 if (DECL_NAME (decl))
3787 olddecl = lookup_name (DECL_NAME (decl));
3788 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3789 pedwarn_with_decl (decl,
3790 "ANSI C forbids parameter `%s' shadowing typedef");
3794 decl = pushdecl (decl);
3796 immediate_size_expand = old_immediate_size_expand;
3798 current_binding_level->parm_order
3799 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3801 /* Add this decl to the current binding level. */
3802 finish_decl (decl, NULL_TREE, NULL_TREE);
3805 /* Clear the given order of parms in `parm_order'.
3806 Used at start of parm list,
3807 and also at semicolon terminating forward decls. */
3812 current_binding_level->parm_order = NULL_TREE;
3815 /* Make TYPE a complete type based on INITIAL_VALUE.
3816 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3817 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3820 complete_array_type (type, initial_value, do_default)
3825 register tree maxindex = NULL_TREE;
3830 /* Note MAXINDEX is really the maximum index,
3831 one less than the size. */
3832 if (TREE_CODE (initial_value) == STRING_CST)
3835 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3836 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3839 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3841 tree elts = CONSTRUCTOR_ELTS (initial_value);
3842 maxindex = build_int_2 (-1, -1);
3843 for (; elts; elts = TREE_CHAIN (elts))
3845 if (TREE_PURPOSE (elts))
3846 maxindex = TREE_PURPOSE (elts);
3848 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3849 maxindex, integer_one_node));
3851 maxindex = copy_node (maxindex);
3855 /* Make an error message unless that happened already. */
3856 if (initial_value != error_mark_node)
3859 /* Prevent further error messages. */
3860 maxindex = build_int_2 (0, 0);
3867 maxindex = build_int_2 (0, 0);
3873 TYPE_DOMAIN (type) = build_index_type (maxindex);
3874 if (!TREE_TYPE (maxindex))
3875 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3878 /* Lay out the type now that we can get the real answer. */
3885 /* Given declspecs and a declarator,
3886 determine the name and type of the object declared
3887 and construct a ..._DECL node for it.
3888 (In one case we can return a ..._TYPE node instead.
3889 For invalid input we sometimes return 0.)
3891 DECLSPECS is a chain of tree_list nodes whose value fields
3892 are the storage classes and type specifiers.
3894 DECL_CONTEXT says which syntactic context this declaration is in:
3895 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3896 FUNCDEF for a function definition. Like NORMAL but a few different
3897 error messages in each case. Return value may be zero meaning
3898 this definition is too screwy to try to parse.
3899 PARM for a parameter declaration (either within a function prototype
3900 or before a function body). Make a PARM_DECL, or return void_type_node.
3901 TYPENAME if for a typename (in a cast or sizeof).
3902 Don't make a DECL node; just return the ..._TYPE node.
3903 FIELD for a struct or union field; make a FIELD_DECL.
3904 BITFIELD for a field with specified width.
3905 INITIALIZED is 1 if the decl has an initializer.
3907 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3908 It may also be so in the PARM case, for a prototype where the
3909 argument type is specified but not the name.
3911 This function is where the complicated C meanings of `static'
3912 and `extern' are interpreted. */
3915 grokdeclarator (declarator, declspecs, decl_context, initialized)
3918 enum decl_context decl_context;
3923 tree type = NULL_TREE;
3928 int type_quals = TYPE_UNQUALIFIED;
3930 int explicit_int = 0;
3931 int explicit_char = 0;
3932 int defaulted_int = 0;
3933 tree typedef_decl = 0;
3935 tree typedef_type = 0;
3936 int funcdef_flag = 0;
3937 enum tree_code innermost_code = ERROR_MARK;
3939 int size_varies = 0;
3940 tree decl_machine_attr = NULL_TREE;
3942 if (decl_context == BITFIELD)
3943 bitfield = 1, decl_context = FIELD;
3945 if (decl_context == FUNCDEF)
3946 funcdef_flag = 1, decl_context = NORMAL;
3948 /* Look inside a declarator for the name being declared
3949 and get it as a string, for an error message. */
3951 register tree decl = declarator;
3955 switch (TREE_CODE (decl))
3960 innermost_code = TREE_CODE (decl);
3961 decl = TREE_OPERAND (decl, 0);
3964 case IDENTIFIER_NODE:
3965 name = IDENTIFIER_POINTER (decl);
3976 /* A function definition's declarator must have the form of
3977 a function declarator. */
3979 if (funcdef_flag && innermost_code != CALL_EXPR)
3982 /* Anything declared one level down from the top level
3983 must be one of the parameters of a function
3984 (because the body is at least two levels down). */
3986 /* If this looks like a function definition, make it one,
3987 even if it occurs where parms are expected.
3988 Then store_parm_decls will reject it and not use it as a parm. */
3989 if (decl_context == NORMAL && !funcdef_flag
3990 && current_binding_level->parm_flag)
3991 decl_context = PARM;
3993 /* Look through the decl specs and record which ones appear.
3994 Some typespecs are defined as built-in typenames.
3995 Others, the ones that are modifiers of other types,
3996 are represented by bits in SPECBITS: set the bits for
3997 the modifiers that appear. Storage class keywords are also in SPECBITS.
3999 If there is a typedef name or a type, store the type in TYPE.
4000 This includes builtin typedefs such as `int'.
4002 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4003 and did not come from a user typedef.
4005 Set LONGLONG if `long' is mentioned twice. */
4007 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4009 register tree id = TREE_VALUE (spec);
4011 if (id == ridpointers[(int) RID_INT])
4013 if (id == ridpointers[(int) RID_CHAR])
4016 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4018 enum rid i = C_RID_CODE (id);
4019 if (i <= RID_LAST_MODIFIER)
4021 if (i == RID_LONG && specbits & (1<<i))
4024 error ("`long long long' is too long for GCC");
4027 if (pedantic && !flag_isoc99 && ! in_system_header
4029 pedwarn ("ISO C89 does not support `long long'");
4033 else if (specbits & (1 << i))
4034 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4040 error ("two or more data types in declaration of `%s'", name);
4041 /* Actual typedefs come to us as TYPE_DECL nodes. */
4042 else if (TREE_CODE (id) == TYPE_DECL)
4044 type = TREE_TYPE (id);
4045 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4048 /* Built-in types come as identifiers. */
4049 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4051 register tree t = lookup_name (id);
4052 if (TREE_TYPE (t) == error_mark_node)
4054 else if (!t || TREE_CODE (t) != TYPE_DECL)
4055 error ("`%s' fails to be a typedef or built in type",
4056 IDENTIFIER_POINTER (id));
4059 type = TREE_TYPE (t);
4063 else if (TREE_CODE (id) != ERROR_MARK)
4070 typedef_type = type;
4072 size_varies = C_TYPE_VARIABLE_SIZE (type);
4074 /* No type at all: default to `int', and set DEFAULTED_INT
4075 because it was not a user-defined typedef. */
4079 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4080 | (1 << (int) RID_SIGNED)
4081 | (1 << (int) RID_UNSIGNED))))
4082 /* Don't warn about typedef foo = bar. */
4083 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4084 && ! in_system_header)
4086 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4087 and this is a function, or if -Wimplicit; prefer the former
4088 warning since it is more explicit. */
4089 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4090 warn_about_return_type = 1;
4091 else if (warn_implicit_int || flag_isoc99)
4092 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4097 type = integer_type_node;
4100 /* Now process the modifiers that were specified
4101 and check for invalid combinations. */
4103 /* Long double is a special combination. */
4105 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4106 && TYPE_MAIN_VARIANT (type) == double_type_node)
4108 specbits &= ~(1 << (int) RID_LONG);
4109 type = long_double_type_node;
4112 /* Check all other uses of type modifiers. */
4114 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4115 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4119 if ((specbits & 1 << (int) RID_LONG)
4120 && (specbits & 1 << (int) RID_SHORT))
4121 error ("both long and short specified for `%s'", name);
4122 else if (((specbits & 1 << (int) RID_LONG)
4123 || (specbits & 1 << (int) RID_SHORT))
4125 error ("long or short specified with char for `%s'", name);
4126 else if (((specbits & 1 << (int) RID_LONG)
4127 || (specbits & 1 << (int) RID_SHORT))
4128 && TREE_CODE (type) == REAL_TYPE)
4130 static int already = 0;
4132 error ("long or short specified with floating type for `%s'", name);
4133 if (! already && ! pedantic)
4135 error ("the only valid combination is `long double'");
4139 else if ((specbits & 1 << (int) RID_SIGNED)
4140 && (specbits & 1 << (int) RID_UNSIGNED))
4141 error ("both signed and unsigned specified for `%s'", name);
4142 else if (TREE_CODE (type) != INTEGER_TYPE)
4143 error ("long, short, signed or unsigned invalid for `%s'", name);
4147 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4149 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4151 if (flag_pedantic_errors)
4156 /* Discard the type modifiers if they are invalid. */
4159 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4160 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4165 if ((specbits & (1 << (int) RID_COMPLEX))
4166 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4168 error ("complex invalid for `%s'", name);
4169 specbits &= ~(1 << (int) RID_COMPLEX);
4172 /* Decide whether an integer type is signed or not.
4173 Optionally treat bitfields as signed by default. */
4174 if (specbits & 1 << (int) RID_UNSIGNED
4175 /* Traditionally, all bitfields are unsigned. */
4176 || (bitfield && flag_traditional
4177 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4178 || (bitfield && ! flag_signed_bitfields
4179 && (explicit_int || defaulted_int || explicit_char
4180 /* A typedef for plain `int' without `signed'
4181 can be controlled just like plain `int'. */
4182 || ! (typedef_decl != 0
4183 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4184 && TREE_CODE (type) != ENUMERAL_TYPE
4185 && !(specbits & 1 << (int) RID_SIGNED)))
4188 type = long_long_unsigned_type_node;
4189 else if (specbits & 1 << (int) RID_LONG)
4190 type = long_unsigned_type_node;
4191 else if (specbits & 1 << (int) RID_SHORT)
4192 type = short_unsigned_type_node;
4193 else if (type == char_type_node)
4194 type = unsigned_char_type_node;
4195 else if (typedef_decl)
4196 type = unsigned_type (type);
4198 type = unsigned_type_node;
4200 else if ((specbits & 1 << (int) RID_SIGNED)
4201 && type == char_type_node)
4202 type = signed_char_type_node;
4204 type = long_long_integer_type_node;
4205 else if (specbits & 1 << (int) RID_LONG)
4206 type = long_integer_type_node;
4207 else if (specbits & 1 << (int) RID_SHORT)
4208 type = short_integer_type_node;
4210 if (specbits & 1 << (int) RID_COMPLEX)
4212 /* If we just have "complex", it is equivalent to
4213 "complex double", but if any modifiers at all are specified it is
4214 the complex form of TYPE. E.g, "complex short" is
4215 "complex short int". */
4217 if (defaulted_int && ! longlong
4218 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4219 | (1 << (int) RID_SIGNED)
4220 | (1 << (int) RID_UNSIGNED))))
4221 type = complex_double_type_node;
4222 else if (type == integer_type_node)
4223 type = complex_integer_type_node;
4224 else if (type == float_type_node)
4225 type = complex_float_type_node;
4226 else if (type == double_type_node)
4227 type = complex_double_type_node;
4228 else if (type == long_double_type_node)
4229 type = complex_long_double_type_node;
4231 type = build_complex_type (type);
4234 /* Figure out the type qualifiers for the declaration. There are
4235 two ways a declaration can become qualified. One is something
4236 like `const int i' where the `const' is explicit. Another is
4237 something like `typedef const int CI; CI i' where the type of the
4238 declaration contains the `const'. */
4239 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4240 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4241 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4242 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4243 if (constp > 1 && ! flag_isoc99)
4244 pedwarn ("duplicate `const'");
4245 if (restrictp > 1 && ! flag_isoc99)
4246 pedwarn ("duplicate `restrict'");
4247 if (volatilep > 1 && ! flag_isoc99)
4248 pedwarn ("duplicate `volatile'");
4249 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4250 type = TYPE_MAIN_VARIANT (type);
4251 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4252 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4253 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4255 /* Warn if two storage classes are given. Default to `auto'. */
4260 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4261 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4262 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4263 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4264 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4266 /* Warn about storage classes that are invalid for certain
4267 kinds of declarations (parameters, typenames, etc.). */
4270 error ("multiple storage classes in declaration of `%s'", name);
4271 else if (funcdef_flag
4273 & ((1 << (int) RID_REGISTER)
4274 | (1 << (int) RID_AUTO)
4275 | (1 << (int) RID_TYPEDEF))))
4277 if (specbits & 1 << (int) RID_AUTO
4278 && (pedantic || current_binding_level == global_binding_level))
4279 pedwarn ("function definition declared `auto'");
4280 if (specbits & 1 << (int) RID_REGISTER)
4281 error ("function definition declared `register'");
4282 if (specbits & 1 << (int) RID_TYPEDEF)
4283 error ("function definition declared `typedef'");
4284 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4285 | (1 << (int) RID_AUTO));
4287 else if (decl_context != NORMAL && nclasses > 0)
4289 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4293 switch (decl_context)
4296 error ("storage class specified for structure field `%s'",
4300 error ("storage class specified for parameter `%s'", name);
4303 error ("storage class specified for typename");
4306 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4307 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4308 | (1 << (int) RID_EXTERN));
4311 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4313 /* `extern' with initialization is invalid if not at top level. */
4314 if (current_binding_level == global_binding_level)
4315 warning ("`%s' initialized and declared `extern'", name);
4317 error ("`%s' has both `extern' and initializer", name);
4319 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4320 && current_binding_level != global_binding_level)
4321 error ("nested function `%s' declared `extern'", name);
4322 else if (current_binding_level == global_binding_level
4323 && specbits & (1 << (int) RID_AUTO))
4324 error ("top-level declaration of `%s' specifies `auto'", name);
4327 /* Now figure out the structure of the declarator proper.
4328 Descend through it, creating more complex types, until we reach
4329 the declared identifier (or NULL_TREE, in an absolute declarator). */
4331 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4333 if (type == error_mark_node)
4335 declarator = TREE_OPERAND (declarator, 0);
4339 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4340 an INDIRECT_REF (for *...),
4341 a CALL_EXPR (for ...(...)),
4342 an identifier (for the name being declared)
4343 or a null pointer (for the place in an absolute declarator
4344 where the name was omitted).
4345 For the last two cases, we have just exited the loop.
4347 At this point, TYPE is the type of elements of an array,
4348 or for a function to return, or for a pointer to point to.
4349 After this sequence of ifs, TYPE is the type of the
4350 array or function or pointer, and DECLARATOR has had its
4351 outermost layer removed. */
4353 if (TREE_CODE (declarator) == ARRAY_REF)
4355 register tree itype = NULL_TREE;
4356 register tree size = TREE_OPERAND (declarator, 1);
4357 /* The index is a signed object `sizetype' bits wide. */
4358 tree index_type = signed_type (sizetype);
4360 declarator = TREE_OPERAND (declarator, 0);
4362 /* Check for some types that there cannot be arrays of. */
4364 if (VOID_TYPE_P (type))
4366 error ("declaration of `%s' as array of voids", name);
4367 type = error_mark_node;
4370 if (TREE_CODE (type) == FUNCTION_TYPE)
4372 error ("declaration of `%s' as array of functions", name);
4373 type = error_mark_node;
4376 if (size == error_mark_node)
4377 type = error_mark_node;
4379 if (type == error_mark_node)
4382 /* If size was specified, set ITYPE to a range-type for that size.
4383 Otherwise, ITYPE remains null. finish_decl may figure it out
4384 from an initial value. */
4388 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4389 STRIP_TYPE_NOPS (size);
4391 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4392 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4394 error ("size of array `%s' has non-integer type", name);
4395 size = integer_one_node;
4398 if (pedantic && integer_zerop (size))
4399 pedwarn ("ISO C forbids zero-size array `%s'", name);
4401 if (TREE_CODE (size) == INTEGER_CST)
4403 constant_expression_warning (size);
4404 if (tree_int_cst_sgn (size) < 0)
4406 error ("size of array `%s' is negative", name);
4407 size = integer_one_node;
4412 /* Make sure the array size remains visibly nonconstant
4413 even if it is (eg) a const variable with known value. */
4418 if (TREE_CONSTANT (size))
4419 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4422 pedwarn ("ISO C89 forbids variable-size array `%s'",
4427 /* Convert size to index_type, so that if it is a variable
4428 the computations will be done in the proper mode. */
4429 itype = fold (build (MINUS_EXPR, index_type,
4430 convert (index_type, size),
4431 convert (index_type, size_one_node)));
4433 /* If that overflowed, the array is too big.
4434 ??? While a size of INT_MAX+1 technically shouldn't cause
4435 an overflow (because we subtract 1), the overflow is recorded
4436 during the conversion to index_type, before the subtraction.
4437 Handling this case seems like an unnecessary complication. */
4438 if (TREE_OVERFLOW (itype))
4440 error ("size of array `%s' is too large", name);
4441 type = error_mark_node;
4446 itype = variable_size (itype);
4447 itype = build_index_type (itype);
4451 /* This had bad results for pointers to arrays, as in
4452 union incomplete (*foo)[4]; */
4453 /* Complain about arrays of incomplete types, except in typedefs. */
4455 if (!COMPLETE_TYPE_P (type)
4456 /* Avoid multiple warnings for nested array types. */
4457 && TREE_CODE (type) != ARRAY_TYPE
4458 && !(specbits & (1 << (int) RID_TYPEDEF))
4459 && !C_TYPE_BEING_DEFINED (type))
4460 warning ("array type has incomplete element type");
4464 /* We shouldn't have a function type here at all!
4465 Functions aren't allowed as array elements. */
4466 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4467 && (constp || volatilep))
4468 pedwarn ("ANSI C forbids const or volatile function types");
4471 /* Build the array type itself, then merge any constancy or
4472 volatility into the target type. We must do it in this order
4473 to ensure that the TYPE_MAIN_VARIANT field of the array type
4474 is set correctly. */
4476 type = build_array_type (type, itype);
4478 type = c_build_qualified_type (type, type_quals);
4481 /* Don't clear these; leave them set so that the array type
4482 or the variable is itself const or volatile. */
4483 type_quals = TYPE_UNQUALIFIED;
4487 C_TYPE_VARIABLE_SIZE (type) = 1;
4489 else if (TREE_CODE (declarator) == CALL_EXPR)
4493 /* Declaring a function type.
4494 Make sure we have a valid type for the function to return. */
4495 if (type == error_mark_node)
4500 /* Warn about some types functions can't return. */
4502 if (TREE_CODE (type) == FUNCTION_TYPE)
4504 error ("`%s' declared as function returning a function", name);
4505 type = integer_type_node;
4507 if (TREE_CODE (type) == ARRAY_TYPE)
4509 error ("`%s' declared as function returning an array", name);
4510 type = integer_type_node;
4513 #ifndef TRADITIONAL_RETURN_FLOAT
4514 /* Traditionally, declaring return type float means double. */
4516 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4517 type = double_type_node;
4518 #endif /* TRADITIONAL_RETURN_FLOAT */
4520 /* Construct the function type and go to the next
4521 inner layer of declarator. */
4523 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4525 /* Say it's a definition
4526 only for the CALL_EXPR
4527 closest to the identifier. */
4528 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4529 /* Type qualifiers before the return type of the function
4530 qualify the return type, not the function type. */
4532 type = c_build_qualified_type (type, type_quals);
4533 type_quals = TYPE_UNQUALIFIED;
4535 type = build_function_type (type, arg_types);
4536 declarator = TREE_OPERAND (declarator, 0);
4538 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4539 the formal parameter list of this FUNCTION_TYPE to point to
4540 the FUNCTION_TYPE node itself. */
4545 for (link = last_function_parm_tags;
4547 link = TREE_CHAIN (link))
4548 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4551 else if (TREE_CODE (declarator) == INDIRECT_REF)
4553 /* Merge any constancy or volatility into the target type
4556 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4558 pedwarn ("ISO C forbids qualified function types");
4560 type = c_build_qualified_type (type, type_quals);
4561 type_quals = TYPE_UNQUALIFIED;
4564 type = build_pointer_type (type);
4566 /* Process a list of type modifier keywords
4567 (such as const or volatile) that were given inside the `*'. */
4569 if (TREE_TYPE (declarator))
4571 register tree typemodlist;
4577 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4578 typemodlist = TREE_CHAIN (typemodlist))
4580 tree qualifier = TREE_VALUE (typemodlist);
4582 if (C_IS_RESERVED_WORD (qualifier))
4584 if (C_RID_CODE (qualifier) == RID_CONST)
4586 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4588 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4598 error ("invalid type modifier within pointer declarator");
4599 if (constp > 1 && ! flag_isoc99)
4600 pedwarn ("duplicate `const'");
4601 if (volatilep > 1 && ! flag_isoc99)
4602 pedwarn ("duplicate `volatile'");
4603 if (restrictp > 1 && ! flag_isoc99)
4604 pedwarn ("duplicate `restrict'");
4606 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4607 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4608 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4611 declarator = TREE_OPERAND (declarator, 0);
4618 /* Now TYPE has the actual type. */
4620 /* Did array size calculations overflow? */
4622 if (TREE_CODE (type) == ARRAY_TYPE
4623 && COMPLETE_TYPE_P (type)
4624 && TREE_OVERFLOW (TYPE_SIZE (type)))
4625 error ("size of array `%s' is too large", name);
4627 /* If this is declaring a typedef name, return a TYPE_DECL. */
4629 if (specbits & (1 << (int) RID_TYPEDEF))
4632 /* Note that the grammar rejects storage classes
4633 in typenames, fields or parameters */
4634 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4636 pedwarn ("ISO C forbids qualified function types");
4638 type = c_build_qualified_type (type, type_quals);
4639 decl = build_decl (TYPE_DECL, declarator, type);
4640 if ((specbits & (1 << (int) RID_SIGNED))
4641 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4642 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4646 /* Detect the case of an array type of unspecified size
4647 which came, as such, direct from a typedef name.
4648 We must copy the type, so that each identifier gets
4649 a distinct type, so that each identifier's size can be
4650 controlled separately by its own initializer. */
4652 if (type != 0 && typedef_type != 0
4653 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4654 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4656 type = build_array_type (TREE_TYPE (type), 0);
4658 C_TYPE_VARIABLE_SIZE (type) = 1;
4661 /* If this is a type name (such as, in a cast or sizeof),
4662 compute the type and return it now. */
4664 if (decl_context == TYPENAME)
4666 /* Note that the grammar rejects storage classes
4667 in typenames, fields or parameters */
4668 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4670 pedwarn ("ISO C forbids const or volatile function types");
4672 type = c_build_qualified_type (type, type_quals);
4676 /* Aside from typedefs and type names (handle above),
4677 `void' at top level (not within pointer)
4678 is allowed only in public variables.
4679 We don't complain about parms either, but that is because
4680 a better error message can be made later. */
4682 if (VOID_TYPE_P (type) && decl_context != PARM
4683 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4684 && ((specbits & (1 << (int) RID_EXTERN))
4685 || (current_binding_level == global_binding_level
4687 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4689 error ("variable or field `%s' declared void", name);
4690 type = integer_type_node;
4693 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4694 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4699 if (decl_context == PARM)
4701 tree type_as_written = type;
4704 /* A parameter declared as an array of T is really a pointer to T.
4705 One declared as a function is really a pointer to a function. */
4707 if (TREE_CODE (type) == ARRAY_TYPE)
4709 /* Transfer const-ness of array into that of type pointed to. */
4710 type = TREE_TYPE (type);
4712 type = c_build_qualified_type (type, type_quals);
4713 type = build_pointer_type (type);
4714 type_quals = TYPE_UNQUALIFIED;
4717 else if (TREE_CODE (type) == FUNCTION_TYPE)
4719 if (pedantic && type_quals)
4720 pedwarn ("ISO C forbids qualified function types");
4722 type = c_build_qualified_type (type, type_quals);
4723 type = build_pointer_type (type);
4724 type_quals = TYPE_UNQUALIFIED;
4727 decl = build_decl (PARM_DECL, declarator, type);
4729 C_DECL_VARIABLE_SIZE (decl) = 1;
4731 /* Compute the type actually passed in the parmlist,
4732 for the case where there is no prototype.
4733 (For example, shorts and chars are passed as ints.)
4734 When there is a prototype, this is overridden later. */
4736 if (type == error_mark_node)
4737 promoted_type = type;
4740 promoted_type = simple_type_promotes_to (type);
4741 if (! promoted_type)
4742 promoted_type = type;
4745 DECL_ARG_TYPE (decl) = promoted_type;
4746 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4748 else if (decl_context == FIELD)
4750 /* Structure field. It may not be a function. */
4752 if (TREE_CODE (type) == FUNCTION_TYPE)
4754 error ("field `%s' declared as a function", name);
4755 type = build_pointer_type (type);
4757 else if (TREE_CODE (type) != ERROR_MARK
4758 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4760 error ("field `%s' has incomplete type", name);
4761 type = error_mark_node;
4763 /* Move type qualifiers down to element of an array. */
4764 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4766 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4768 TYPE_DOMAIN (type));
4770 /* Leave the field const or volatile as well. */
4771 type_quals = TYPE_UNQUALIFIED;
4774 decl = build_decl (FIELD_DECL, declarator, type);
4775 DECL_NONADDRESSABLE_P (decl) = bitfield;
4778 C_DECL_VARIABLE_SIZE (decl) = 1;
4780 else if (TREE_CODE (type) == FUNCTION_TYPE)
4782 /* Every function declaration is "external"
4783 except for those which are inside a function body
4784 in which `auto' is used.
4785 That is a case not specified by ANSI C,
4786 and we use it for forward declarations for nested functions. */
4787 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4788 || current_binding_level == global_binding_level);
4790 if (specbits & (1 << (int) RID_AUTO)
4791 && (pedantic || current_binding_level == global_binding_level))
4792 pedwarn ("invalid storage class for function `%s'", name);
4793 if (specbits & (1 << (int) RID_REGISTER))
4794 error ("invalid storage class for function `%s'", name);
4795 /* Function declaration not at top level.
4796 Storage classes other than `extern' are not allowed
4797 and `extern' makes no difference. */
4798 if (current_binding_level != global_binding_level
4799 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4801 pedwarn ("invalid storage class for function `%s'", name);
4803 decl = build_decl (FUNCTION_DECL, declarator, type);
4804 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4806 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4807 pedwarn ("ISO C forbids qualified function types");
4810 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4811 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4812 && ! DECL_IN_SYSTEM_HEADER (decl))
4813 pedwarn ("ISO C forbids qualified void function return type");
4815 /* GNU C interprets a `volatile void' return type to indicate
4816 that the function does not return. */
4817 if ((type_quals & TYPE_QUAL_VOLATILE)
4818 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4819 warning ("`noreturn' function returns non-void value");
4822 DECL_EXTERNAL (decl) = 1;
4823 /* Record absence of global scope for `static' or `auto'. */
4825 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4827 /* Record presence of `inline', if it is reasonable. */
4830 if (MAIN_NAME_P (declarator))
4831 warning ("cannot inline function `main'");
4833 /* Assume that otherwise the function can be inlined. */
4834 DECL_INLINE (decl) = 1;
4836 if (specbits & (1 << (int) RID_EXTERN))
4837 current_extern_inline = 1;
4842 /* It's a variable. */
4843 /* An uninitialized decl with `extern' is a reference. */
4844 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4846 /* Move type qualifiers down to element of an array. */
4847 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4849 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4851 TYPE_DOMAIN (type));
4852 #if 0 /* Leave the variable const or volatile as well. */
4853 type_quals = TYPE_UNQUALIFIED;
4857 decl = build_decl (VAR_DECL, declarator, type);
4859 C_DECL_VARIABLE_SIZE (decl) = 1;
4862 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4864 DECL_EXTERNAL (decl) = extern_ref;
4865 /* At top level, the presence of a `static' or `register' storage
4866 class specifier, or the absence of all storage class specifiers
4867 makes this declaration a definition (perhaps tentative). Also,
4868 the absence of both `static' and `register' makes it public. */
4869 if (current_binding_level == global_binding_level)
4873 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4874 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4876 /* Not at top level, only `static' makes a static definition. */
4879 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4880 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4884 /* Record `register' declaration for warnings on &
4885 and in case doing stupid register allocation. */
4887 if (specbits & (1 << (int) RID_REGISTER))
4888 DECL_REGISTER (decl) = 1;
4890 /* Record constancy and volatility. */
4891 c_apply_type_quals_to_decl (type_quals, decl);
4893 /* If a type has volatile components, it should be stored in memory.
4894 Otherwise, the fact that those components are volatile
4895 will be ignored, and would even crash the compiler. */
4896 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4897 mark_addressable (decl);
4903 /* Decode the parameter-list info for a function type or function definition.
4904 The argument is the value returned by `get_parm_info' (or made in parse.y
4905 if there is an identifier list instead of a parameter decl list).
4906 These two functions are separate because when a function returns
4907 or receives functions then each is called multiple times but the order
4908 of calls is different. The last call to `grokparms' is always the one
4909 that contains the formal parameter names of a function definition.
4911 Store in `last_function_parms' a chain of the decls of parms.
4912 Also store in `last_function_parm_tags' a chain of the struct, union,
4913 and enum tags declared among the parms.
4915 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4917 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4918 a mere declaration. A nonempty identifier-list gets an error message
4919 when FUNCDEF_FLAG is zero. */
4922 grokparms (parms_info, funcdef_flag)
4926 tree first_parm = TREE_CHAIN (parms_info);
4928 last_function_parms = TREE_PURPOSE (parms_info);
4929 last_function_parm_tags = TREE_VALUE (parms_info);
4931 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4932 && !in_system_header)
4933 warning ("function declaration isn't a prototype");
4936 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4939 pedwarn ("parameter names (without types) in function declaration");
4941 last_function_parms = first_parm;
4948 /* We no longer test FUNCDEF_FLAG.
4949 If the arg types are incomplete in a declaration,
4950 they must include undefined tags.
4951 These tags can never be defined in the scope of the declaration,
4952 so the types can never be completed,
4953 and no call can be compiled successfully. */
4955 /* In a fcn definition, arg types must be complete. */
4958 for (parm = last_function_parms, typelt = first_parm;
4960 parm = TREE_CHAIN (parm))
4961 /* Skip over any enumeration constants declared here. */
4962 if (TREE_CODE (parm) == PARM_DECL)
4964 /* Barf if the parameter itself has an incomplete type. */
4965 tree type = TREE_VALUE (typelt);
4966 if (!COMPLETE_TYPE_P (type))
4968 if (funcdef_flag && DECL_NAME (parm) != 0)
4969 error ("parameter `%s' has incomplete type",
4970 IDENTIFIER_POINTER (DECL_NAME (parm)));
4972 warning ("parameter has incomplete type");
4975 TREE_VALUE (typelt) = error_mark_node;
4976 TREE_TYPE (parm) = error_mark_node;
4980 /* This has been replaced by parm_tags_warning, which
4981 uses a more accurate criterion for what to warn
4985 /* Now warn if is a pointer to an incomplete type. */
4986 while (TREE_CODE (type) == POINTER_TYPE
4987 || TREE_CODE (type) == REFERENCE_TYPE)
4988 type = TREE_TYPE (type);
4989 type = TYPE_MAIN_VARIANT (type);
4990 if (!COMPLETE_TYPE_P (type))
4992 if (DECL_NAME (parm) != 0)
4993 warning ("parameter `%s' points to incomplete type",
4994 IDENTIFIER_POINTER (DECL_NAME (parm)));
4996 warning ("parameter points to incomplete type");
5000 typelt = TREE_CHAIN (typelt);
5007 /* Return a tree_list node with info on a parameter list just parsed.
5008 The TREE_PURPOSE is a chain of decls of those parms.
5009 The TREE_VALUE is a list of structure, union and enum tags defined.
5010 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5011 This tree_list node is later fed to `grokparms'.
5013 VOID_AT_END nonzero means append `void' to the end of the type-list.
5014 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5017 get_parm_info (void_at_end)
5020 register tree decl, t;
5021 register tree types = 0;
5023 tree tags = gettags ();
5024 tree parms = getdecls ();
5026 tree order = current_binding_level->parm_order;
5028 /* Just `void' (and no ellipsis) is special. There are really no parms.
5029 But if the `void' is qualified (by `const' or `volatile') or has a
5030 storage class specifier (`register'), then the behavior is undefined;
5031 by not counting it as the special case of `void' we will cause an
5032 error later. Typedefs for `void' are OK (see DR#157). */
5033 if (void_at_end && parms != 0
5034 && TREE_CHAIN (parms) == 0
5035 && VOID_TYPE_P (TREE_TYPE (parms))
5036 && ! TREE_THIS_VOLATILE (parms)
5037 && ! TREE_READONLY (parms)
5038 && ! DECL_REGISTER (parms)
5039 && DECL_NAME (parms) == 0)
5042 storedecls (NULL_TREE);
5043 return tree_cons (NULL_TREE, NULL_TREE,
5044 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5047 /* Extract enumerator values and other non-parms declared with the parms.
5048 Likewise any forward parm decls that didn't have real parm decls. */
5049 for (decl = parms; decl;)
5051 tree next = TREE_CHAIN (decl);
5053 if (TREE_CODE (decl) != PARM_DECL)
5055 TREE_CHAIN (decl) = new_parms;
5058 else if (TREE_ASM_WRITTEN (decl))
5060 error_with_decl (decl,
5061 "parameter `%s' has just a forward declaration");
5062 TREE_CHAIN (decl) = new_parms;
5068 /* Put the parm decls back in the order they were in in the parm list. */
5069 for (t = order; t; t = TREE_CHAIN (t))
5072 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5074 TREE_CHAIN (TREE_VALUE (t)) = 0;
5077 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5080 /* Store the parmlist in the binding level since the old one
5081 is no longer a valid list. (We have changed the chain pointers.) */
5082 storedecls (new_parms);
5084 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5085 /* There may also be declarations for enumerators if an enumeration
5086 type is declared among the parms. Ignore them here. */
5087 if (TREE_CODE (decl) == PARM_DECL)
5089 /* Since there is a prototype,
5090 args are passed in their declared types. */
5091 tree type = TREE_TYPE (decl);
5092 DECL_ARG_TYPE (decl) = type;
5093 if (PROMOTE_PROTOTYPES
5094 && (TREE_CODE (type) == INTEGER_TYPE
5095 || TREE_CODE (type) == ENUMERAL_TYPE)
5096 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5097 DECL_ARG_TYPE (decl) = integer_type_node;
5099 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5100 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5101 && DECL_NAME (decl) == 0)
5103 error ("`void' in parameter list must be the entire list");
5109 return tree_cons (new_parms, tags,
5110 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5112 return tree_cons (new_parms, tags, nreverse (types));
5115 /* At end of parameter list, warn about any struct, union or enum tags
5116 defined within. Do so because these types cannot ever become complete. */
5119 parmlist_tags_warning ()
5124 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5126 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5127 /* An anonymous union parm type is meaningful as a GNU extension.
5128 So don't warn for that. */
5129 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5131 if (TREE_PURPOSE (elt) != 0)
5132 warning ("`%s %s' declared inside parameter list",
5133 (code == RECORD_TYPE ? "struct"
5134 : code == UNION_TYPE ? "union"
5136 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5139 /* For translation these need to be seperate warnings */
5140 if (code == RECORD_TYPE)
5141 warning ("anonymous struct declared inside parameter list");
5142 else if (code == UNION_TYPE)
5143 warning ("anonymous union declared inside parameter list");
5145 warning ("anonymous enum declared inside parameter list");
5149 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5155 /* Get the struct, enum or union (CODE says which) with tag NAME.
5156 Define the tag as a forward-reference if it is not defined. */
5159 xref_tag (code, name)
5160 enum tree_code code;
5163 /* If a cross reference is requested, look up the type
5164 already defined for this tag and return it. */
5166 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5167 /* Even if this is the wrong type of tag, return what we found.
5168 There will be an error message anyway, from pending_xref_error.
5169 If we create an empty xref just for an invalid use of the type,
5170 the main result is to create lots of superfluous error messages. */
5174 /* If no such tag is yet defined, create a forward-reference node
5175 and record it as the "definition".
5176 When a real declaration of this type is found,
5177 the forward-reference will be altered into a real type. */
5179 ref = make_node (code);
5180 if (code == ENUMERAL_TYPE)
5182 /* (In ANSI, Enums can be referred to only if already defined.) */
5184 pedwarn ("ISO C forbids forward references to `enum' types");
5185 /* Give the type a default layout like unsigned int
5186 to avoid crashing if it does not get defined. */
5187 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5188 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5189 TYPE_USER_ALIGN (ref) = 0;
5190 TREE_UNSIGNED (ref) = 1;
5191 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5192 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5193 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5196 pushtag (name, ref);
5201 /* Make sure that the tag NAME is defined *in the current binding level*
5202 at least as a forward reference.
5203 CODE says which kind of tag NAME ought to be. */
5206 start_struct (code, name)
5207 enum tree_code code;
5210 /* If there is already a tag defined at this binding level
5211 (as a forward reference), just return it. */
5213 register tree ref = 0;
5216 ref = lookup_tag (code, name, current_binding_level, 1);
5217 if (ref && TREE_CODE (ref) == code)
5219 C_TYPE_BEING_DEFINED (ref) = 1;
5220 TYPE_PACKED (ref) = flag_pack_struct;
5221 if (TYPE_FIELDS (ref))
5222 error ("redefinition of `%s %s'",
5223 code == UNION_TYPE ? "union" : "struct",
5224 IDENTIFIER_POINTER (name));
5229 /* Otherwise create a forward-reference just so the tag is in scope. */
5231 ref = make_node (code);
5232 pushtag (name, ref);
5233 C_TYPE_BEING_DEFINED (ref) = 1;
5234 TYPE_PACKED (ref) = flag_pack_struct;
5238 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5239 of a structure component, returning a FIELD_DECL node.
5240 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5242 This is done during the parsing of the struct declaration.
5243 The FIELD_DECL nodes are chained together and the lot of them
5244 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5247 grokfield (filename, line, declarator, declspecs, width)
5248 const char *filename ATTRIBUTE_UNUSED;
5249 int line ATTRIBUTE_UNUSED;
5250 tree declarator, declspecs, width;
5254 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5256 finish_decl (value, NULL_TREE, NULL_TREE);
5257 DECL_INITIAL (value) = width;
5259 maybe_objc_check_decl (value);
5263 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5264 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5265 ATTRIBUTES are attributes to be applied to the structure. */
5268 finish_struct (t, fieldlist, attributes)
5274 int toplevel = global_binding_level == current_binding_level;
5276 /* If this type was previously laid out as a forward reference,
5277 make sure we lay it out again. */
5281 decl_attributes (t, attributes, NULL_TREE);
5283 /* Nameless union parm types are useful as GCC extension. */
5284 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5285 /* Otherwise, warn about any struct or union def. in parmlist. */
5286 if (in_parm_level_p ())
5289 pedwarn ("%s defined inside parms",
5290 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5291 else if (! flag_traditional)
5292 warning ("%s defined inside parms",
5293 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5298 for (x = fieldlist; x; x = TREE_CHAIN (x))
5299 if (DECL_NAME (x) != 0)
5303 pedwarn ("%s has no %s",
5304 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5305 fieldlist ? _("named members") : _("members"));
5308 /* Install struct as DECL_CONTEXT of each field decl.
5309 Also process specified field sizes,m which is found in the DECL_INITIAL.
5310 Store 0 there, except for ": 0" fields (so we can find them
5311 and delete them, below). */
5313 for (x = fieldlist; x; x = TREE_CHAIN (x))
5315 DECL_CONTEXT (x) = t;
5316 DECL_PACKED (x) |= TYPE_PACKED (t);
5318 /* If any field is const, the structure type is pseudo-const. */
5319 if (TREE_READONLY (x))
5320 C_TYPE_FIELDS_READONLY (t) = 1;
5323 /* A field that is pseudo-const makes the structure likewise. */
5324 tree t1 = TREE_TYPE (x);
5325 while (TREE_CODE (t1) == ARRAY_TYPE)
5326 t1 = TREE_TYPE (t1);
5327 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5328 && C_TYPE_FIELDS_READONLY (t1))
5329 C_TYPE_FIELDS_READONLY (t) = 1;
5332 /* Any field that is volatile means variables of this type must be
5333 treated in some ways as volatile. */
5334 if (TREE_THIS_VOLATILE (x))
5335 C_TYPE_FIELDS_VOLATILE (t) = 1;
5337 /* Any field of nominal variable size implies structure is too. */
5338 if (C_DECL_VARIABLE_SIZE (x))
5339 C_TYPE_VARIABLE_SIZE (t) = 1;
5341 /* Detect invalid nested redefinition. */
5342 if (TREE_TYPE (x) == t)
5343 error ("nested redefinition of `%s'",
5344 IDENTIFIER_POINTER (TYPE_NAME (t)));
5346 /* Detect invalid bit-field size. */
5347 if (DECL_INITIAL (x))
5348 STRIP_NOPS (DECL_INITIAL (x));
5349 if (DECL_INITIAL (x))
5351 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5352 constant_expression_warning (DECL_INITIAL (x));
5356 "bit-field `%s' width not an integer constant");
5357 DECL_INITIAL (x) = NULL;
5361 /* Detect invalid bit-field type. */
5362 if (DECL_INITIAL (x)
5363 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5364 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5366 error_with_decl (x, "bit-field `%s' has invalid type");
5367 DECL_INITIAL (x) = NULL;
5370 if (DECL_INITIAL (x) && pedantic
5371 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5372 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5373 /* Accept an enum that's equivalent to int or unsigned int. */
5374 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5375 && (TYPE_PRECISION (TREE_TYPE (x))
5376 == TYPE_PRECISION (integer_type_node))))
5377 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5379 /* Detect and ignore out of range field width and process valid
5381 if (DECL_INITIAL (x))
5383 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5384 error_with_decl (x, "negative width in bit-field `%s'");
5385 else if (0 < compare_tree_int (DECL_INITIAL (x),
5386 TYPE_PRECISION (TREE_TYPE (x))))
5387 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5388 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5389 error_with_decl (x, "zero width for bit-field `%s'");
5392 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5393 unsigned HOST_WIDE_INT width
5394 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5396 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5397 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5398 TREE_UNSIGNED (TREE_TYPE (x)))
5400 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5401 TREE_UNSIGNED (TREE_TYPE (x))))))
5402 warning_with_decl (x,
5403 "`%s' is narrower than values of its type");
5405 DECL_SIZE (x) = bitsize_int (width);
5406 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5410 /* field size 0 => force desired amount of alignment. */
5411 #ifdef EMPTY_FIELD_BOUNDARY
5412 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5414 #ifdef PCC_BITFIELD_TYPE_MATTERS
5415 if (PCC_BITFIELD_TYPE_MATTERS)
5417 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5418 TYPE_ALIGN (TREE_TYPE (x)));
5419 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5426 else if (TREE_TYPE (x) != error_mark_node)
5428 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5429 : TYPE_ALIGN (TREE_TYPE (x)));
5431 /* Non-bit-fields are aligned for their type, except packed
5432 fields which require only BITS_PER_UNIT alignment. */
5433 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5434 if (! DECL_PACKED (x))
5435 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5438 DECL_INITIAL (x) = 0;
5441 /* Delete all duplicate fields from the fieldlist */
5442 for (x = fieldlist; x && TREE_CHAIN (x);)
5443 /* Anonymous fields aren't duplicates. */
5444 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5448 register tree y = fieldlist;
5452 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5458 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5460 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5461 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5467 /* Now we have the nearly final fieldlist. Record it,
5468 then lay out the structure or union (including the fields). */
5470 TYPE_FIELDS (t) = fieldlist;
5474 /* Delete all zero-width bit-fields from the fieldlist */
5476 tree *fieldlistp = &fieldlist;
5478 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5479 *fieldlistp = TREE_CHAIN (*fieldlistp);
5481 fieldlistp = &TREE_CHAIN (*fieldlistp);
5484 /* Now we have the truly final field list.
5485 Store it in this type and in the variants. */
5487 TYPE_FIELDS (t) = fieldlist;
5489 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5491 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5492 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5493 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5494 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5497 /* If this was supposed to be a transparent union, but we can't
5498 make it one, warn and turn off the flag. */
5499 if (TREE_CODE (t) == UNION_TYPE
5500 && TYPE_TRANSPARENT_UNION (t)
5501 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5503 TYPE_TRANSPARENT_UNION (t) = 0;
5504 warning ("union cannot be made transparent");
5507 /* If this structure or union completes the type of any previous
5508 variable declaration, lay it out and output its rtl. */
5510 if (current_binding_level->n_incomplete != 0)
5513 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5515 if (TREE_TYPE (decl) == t
5516 && TREE_CODE (decl) != TYPE_DECL)
5518 layout_decl (decl, 0);
5519 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5520 maybe_objc_check_decl (decl);
5521 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5524 --current_binding_level->n_incomplete;
5526 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5527 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5529 tree element = TREE_TYPE (decl);
5530 while (TREE_CODE (element) == ARRAY_TYPE)
5531 element = TREE_TYPE (element);
5533 layout_array_type (TREE_TYPE (decl));
5538 /* Finish debugging output for this type. */
5539 rest_of_type_compilation (t, toplevel);
5544 /* Lay out the type T, and its element type, and so on. */
5547 layout_array_type (t)
5550 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5551 layout_array_type (TREE_TYPE (t));
5555 /* Begin compiling the definition of an enumeration type.
5556 NAME is its name (or null if anonymous).
5557 Returns the type object, as yet incomplete.
5558 Also records info about it so that build_enumerator
5559 may be used to declare the individual values as they are read. */
5565 register tree enumtype = 0;
5567 /* If this is the real definition for a previous forward reference,
5568 fill in the contents in the same object that used to be the
5569 forward reference. */
5572 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5574 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5576 enumtype = make_node (ENUMERAL_TYPE);
5577 pushtag (name, enumtype);
5580 C_TYPE_BEING_DEFINED (enumtype) = 1;
5582 if (TYPE_VALUES (enumtype) != 0)
5584 /* This enum is a named one that has been declared already. */
5585 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5587 /* Completely replace its old definition.
5588 The old enumerators remain defined, however. */
5589 TYPE_VALUES (enumtype) = 0;
5592 enum_next_value = integer_zero_node;
5595 if (flag_short_enums)
5596 TYPE_PACKED (enumtype) = 1;
5601 /* After processing and defining all the values of an enumeration type,
5602 install their decls in the enumeration type and finish it off.
5603 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5604 and ATTRIBUTES are the specified attributes.
5605 Returns ENUMTYPE. */
5608 finish_enum (enumtype, values, attributes)
5613 register tree pair, tem;
5614 tree minnode = 0, maxnode = 0, enum_value_type;
5615 int precision, unsign;
5616 int toplevel = (global_binding_level == current_binding_level);
5618 if (in_parm_level_p ())
5619 warning ("enum defined inside parms");
5621 decl_attributes (enumtype, attributes, NULL_TREE);
5623 /* Calculate the maximum value of any enumerator in this type. */
5625 if (values == error_mark_node)
5626 minnode = maxnode = integer_zero_node;
5629 minnode = maxnode = TREE_VALUE (values);
5630 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5632 tree value = TREE_VALUE (pair);
5633 if (tree_int_cst_lt (maxnode, value))
5635 if (tree_int_cst_lt (value, minnode))
5640 /* Construct the final type of this enumeration. It is the same
5641 as one of the integral types - the narrowest one that fits, except
5642 that normally we only go as narrow as int - and signed iff any of
5643 the values are negative. */
5644 unsign = (tree_int_cst_sgn (minnode) >= 0);
5645 precision = MAX (min_precision (minnode, unsign),
5646 min_precision (maxnode, unsign));
5647 if (!TYPE_PACKED (enumtype))
5648 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5649 if (type_for_size (precision, unsign) == 0)
5651 warning ("enumeration values exceed range of largest integer");
5652 precision = TYPE_PRECISION (long_long_integer_type_node);
5655 if (precision == TYPE_PRECISION (integer_type_node))
5656 enum_value_type = type_for_size (precision, 0);
5658 enum_value_type = enumtype;
5660 TYPE_MIN_VALUE (enumtype) = minnode;
5661 TYPE_MAX_VALUE (enumtype) = maxnode;
5662 TYPE_PRECISION (enumtype) = precision;
5663 TREE_UNSIGNED (enumtype) = unsign;
5664 TYPE_SIZE (enumtype) = 0;
5665 layout_type (enumtype);
5667 if (values != error_mark_node)
5669 /* Change the type of the enumerators to be the enum type. We
5670 need to do this irrespective of the size of the enum, for
5671 proper type checking. Replace the DECL_INITIALs of the
5672 enumerators, and the value slots of the list, with copies
5673 that have the enum type; they cannot be modified in place
5674 because they may be shared (e.g. integer_zero_node) Finally,
5675 change the purpose slots to point to the names of the decls. */
5676 for (pair = values; pair; pair = TREE_CHAIN (pair))
5678 tree enu = TREE_PURPOSE (pair);
5680 TREE_TYPE (enu) = enumtype;
5681 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5682 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5683 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5684 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5685 DECL_MODE (enu) = TYPE_MODE (enumtype);
5687 /* The ISO C Standard mandates enumerators to have type int,
5688 even though the underlying type of an enum type is
5689 unspecified. Here we convert any enumerators that fit in
5690 an int to type int, to avoid promotions to unsigned types
5691 when comparing integers with enumerators that fit in the
5692 int range. When -pedantic is given, build_enumerator()
5693 would have already taken care of those that don't fit. */
5694 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5695 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5697 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5699 TREE_PURPOSE (pair) = DECL_NAME (enu);
5700 TREE_VALUE (pair) = DECL_INITIAL (enu);
5703 TYPE_VALUES (enumtype) = values;
5706 /* Fix up all variant types of this enum type. */
5707 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5709 if (tem == enumtype)
5711 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5712 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5713 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5714 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5715 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5716 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5717 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5718 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5719 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5720 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5723 /* Finish debugging output for this type. */
5724 rest_of_type_compilation (enumtype, toplevel);
5729 /* Build and install a CONST_DECL for one value of the
5730 current enumeration type (one that was begun with start_enum).
5731 Return a tree-list containing the CONST_DECL and its value.
5732 Assignment of sequential values by default is handled here. */
5735 build_enumerator (name, value)
5738 register tree decl, type;
5740 /* Validate and default VALUE. */
5742 /* Remove no-op casts from the value. */
5744 STRIP_TYPE_NOPS (value);
5748 if (TREE_CODE (value) == INTEGER_CST)
5750 value = default_conversion (value);
5751 constant_expression_warning (value);
5755 error ("enumerator value for `%s' not integer constant",
5756 IDENTIFIER_POINTER (name));
5761 /* Default based on previous value. */
5762 /* It should no longer be possible to have NON_LVALUE_EXPR
5766 value = enum_next_value;
5768 error ("overflow in enumeration values");
5771 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5773 pedwarn ("ISO C restricts enumerator values to range of `int'");
5774 value = convert (integer_type_node, value);
5777 /* Set basis for default for next value. */
5778 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5779 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5781 /* Now create a declaration for the enum value name. */
5783 type = TREE_TYPE (value);
5784 type = type_for_size (MAX (TYPE_PRECISION (type),
5785 TYPE_PRECISION (integer_type_node)),
5787 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5788 && TREE_UNSIGNED (type)));
5790 decl = build_decl (CONST_DECL, name, type);
5791 DECL_INITIAL (decl) = convert (type, value);
5794 return tree_cons (decl, value, NULL_TREE);
5798 /* Create the FUNCTION_DECL for a function definition.
5799 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5800 the declaration; they describe the function's name and the type it returns,
5801 but twisted together in a fashion that parallels the syntax of C.
5803 This function creates a binding context for the function body
5804 as well as setting up the FUNCTION_DECL in current_function_decl.
5806 Returns 1 on success. If the DECLARATOR is not suitable for a function
5807 (it defines a datum instead), we return 0, which tells
5808 yyparse to report a parse error. */
5811 start_function (declspecs, declarator, prefix_attributes, attributes)
5812 tree declarator, declspecs, prefix_attributes, attributes;
5814 tree decl1, old_decl;
5816 int old_immediate_size_expand = immediate_size_expand;
5818 current_function_returns_value = 0; /* Assume, until we see it does. */
5819 current_function_returns_null = 0;
5820 warn_about_return_type = 0;
5821 current_extern_inline = 0;
5822 c_function_varargs = 0;
5824 shadowed_labels = 0;
5826 /* Don't expand any sizes in the return type of the function. */
5827 immediate_size_expand = 0;
5829 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5831 /* If the declarator is not suitable for a function definition,
5832 cause a syntax error. */
5835 immediate_size_expand = old_immediate_size_expand;
5839 decl_attributes (decl1, prefix_attributes, attributes);
5841 announce_function (decl1);
5843 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5845 error ("return type is an incomplete type");
5846 /* Make it return void instead. */
5848 = build_function_type (void_type_node,
5849 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5852 if (warn_about_return_type)
5853 pedwarn_c99 ("return type defaults to `int'");
5855 /* Save the parm names or decls from this function's declarator
5856 where store_parm_decls will find them. */
5857 current_function_parms = last_function_parms;
5858 current_function_parm_tags = last_function_parm_tags;
5860 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5861 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5862 DECL_INITIAL (decl1) = error_mark_node;
5864 /* If this definition isn't a prototype and we had a prototype declaration
5865 before, copy the arg type info from that prototype.
5866 But not if what we had before was a builtin function. */
5867 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5868 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5869 && !DECL_BUILT_IN (old_decl)
5870 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5871 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5872 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5874 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5875 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5876 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5879 /* If there is no explicit declaration, look for any out-of-scope implicit
5882 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5884 /* Optionally warn of old-fashioned def with no previous prototype. */
5885 if (warn_strict_prototypes
5886 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5887 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5888 warning ("function declaration isn't a prototype");
5889 /* Optionally warn of any global def with no previous prototype. */
5890 else if (warn_missing_prototypes
5891 && TREE_PUBLIC (decl1)
5892 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5893 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5894 warning_with_decl (decl1, "no previous prototype for `%s'");
5895 /* Optionally warn of any def with no previous prototype
5896 if the function has already been used. */
5897 else if (warn_missing_prototypes
5898 && old_decl != 0 && TREE_USED (old_decl)
5899 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5900 warning_with_decl (decl1,
5901 "`%s' was used with no prototype before its definition");
5902 /* Optionally warn of any global def with no previous declaration. */
5903 else if (warn_missing_declarations
5904 && TREE_PUBLIC (decl1)
5906 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5907 warning_with_decl (decl1, "no previous declaration for `%s'");
5908 /* Optionally warn of any def with no previous declaration
5909 if the function has already been used. */
5910 else if (warn_missing_declarations
5911 && old_decl != 0 && TREE_USED (old_decl)
5912 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5913 warning_with_decl (decl1,
5914 "`%s' was used with no declaration before its definition");
5916 /* This is a definition, not a reference.
5917 So normally clear DECL_EXTERNAL.
5918 However, `extern inline' acts like a declaration
5919 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5920 DECL_EXTERNAL (decl1) = current_extern_inline;
5922 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5923 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5926 /* This function exists in static storage.
5927 (This does not mean `static' in the C sense!) */
5928 TREE_STATIC (decl1) = 1;
5930 /* A nested function is not global. */
5931 if (current_function_decl != 0)
5932 TREE_PUBLIC (decl1) = 0;
5934 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5935 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5940 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5941 != integer_type_node)
5942 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5944 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5945 args = TREE_CHAIN (args))
5947 tree type = args ? TREE_VALUE (args) : 0;
5949 if (type == void_type_node)
5956 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5957 pedwarn_with_decl (decl1,
5958 "first argument of `%s' should be `int'");
5962 if (TREE_CODE (type) != POINTER_TYPE
5963 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5964 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5966 pedwarn_with_decl (decl1,
5967 "second argument of `%s' should be `char **'");
5971 if (TREE_CODE (type) != POINTER_TYPE
5972 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5973 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5975 pedwarn_with_decl (decl1,
5976 "third argument of `%s' should probably be `char **'");
5981 /* It is intentional that this message does not mention the third
5982 argument, which is warned for only pedantically, because it's
5983 blessed by mention in an appendix of the standard. */
5984 if (argct > 0 && (argct < 2 || argct > 3))
5985 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5987 if (argct == 3 && pedantic)
5988 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5990 if (! TREE_PUBLIC (decl1))
5991 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5994 /* Record the decl so that the function name is defined.
5995 If we already have a decl for this name, and it is a FUNCTION_DECL,
5996 use the old decl. */
5998 current_function_decl = pushdecl (decl1);
6001 declare_parm_level (1);
6002 current_binding_level->subblocks_tag_transparent = 1;
6004 make_function_rtl (current_function_decl);
6006 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6007 /* Promote the value to int before returning it. */
6008 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6010 /* It retains unsignedness if traditional
6011 or if not really getting wider. */
6012 if (TREE_UNSIGNED (restype)
6013 && (flag_traditional
6014 || (TYPE_PRECISION (restype)
6015 == TYPE_PRECISION (integer_type_node))))
6016 restype = unsigned_type_node;
6018 restype = integer_type_node;
6020 DECL_RESULT (current_function_decl)
6021 = build_decl (RESULT_DECL, NULL_TREE, restype);
6023 /* If this fcn was already referenced via a block-scope `extern' decl
6024 (or an implicit decl), propagate certain information about the usage. */
6025 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6026 TREE_ADDRESSABLE (current_function_decl) = 1;
6028 immediate_size_expand = old_immediate_size_expand;
6033 /* Record that this function is going to be a varargs function.
6034 This is called before store_parm_decls, which is too early
6035 to call mark_varargs directly. */
6040 c_function_varargs = 1;
6043 /* Store the parameter declarations into the current function declaration.
6044 This is called after parsing the parameter declarations, before
6045 digesting the body of the function.
6047 For an old-style definition, modify the function's type
6048 to specify at least the number of arguments. */
6053 register tree fndecl = current_function_decl;
6056 /* This is either a chain of PARM_DECLs (if a prototype was used)
6057 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6058 tree specparms = current_function_parms;
6060 /* This is a list of types declared among parms in a prototype. */
6061 tree parmtags = current_function_parm_tags;
6063 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6064 register tree parmdecls = getdecls ();
6066 /* This is a chain of any other decls that came in among the parm
6067 declarations. If a parm is declared with enum {foo, bar} x;
6068 then CONST_DECLs for foo and bar are put here. */
6071 /* Nonzero if this definition is written with a prototype. */
6074 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6076 /* This case is when the function was defined with an ANSI prototype.
6077 The parms already have decls, so we need not do anything here
6078 except record them as in effect
6079 and complain if any redundant old-style parm decls were written. */
6090 error_with_decl (fndecl,
6091 "parm types given both in parmlist and separately");
6092 /* Get rid of the erroneous decls; don't keep them on
6093 the list of parms, since they might not be PARM_DECLs. */
6094 for (decl = current_binding_level->names;
6095 decl; decl = TREE_CHAIN (decl))
6096 if (DECL_NAME (decl))
6097 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6098 for (link = current_binding_level->shadowed;
6099 link; link = TREE_CHAIN (link))
6100 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6101 current_binding_level->names = 0;
6102 current_binding_level->shadowed = 0;
6105 specparms = nreverse (specparms);
6106 for (parm = specparms; parm; parm = next)
6108 next = TREE_CHAIN (parm);
6109 if (TREE_CODE (parm) == PARM_DECL)
6111 if (DECL_NAME (parm) == 0)
6112 error_with_decl (parm, "parameter name omitted");
6113 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6114 && VOID_TYPE_P (TREE_TYPE (parm)))
6116 error_with_decl (parm, "parameter `%s' declared void");
6117 /* Change the type to error_mark_node so this parameter
6118 will be ignored by assign_parms. */
6119 TREE_TYPE (parm) = error_mark_node;
6125 /* If we find an enum constant or a type tag,
6126 put it aside for the moment. */
6127 TREE_CHAIN (parm) = 0;
6128 others = chainon (others, parm);
6132 /* Get the decls in their original chain order
6133 and record in the function. */
6134 DECL_ARGUMENTS (fndecl) = getdecls ();
6137 /* If this function takes a variable number of arguments,
6138 add a phony parameter to the end of the parm list,
6139 to represent the position of the first unnamed argument. */
6140 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6143 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6144 /* Let's hope the address of the unnamed parm
6145 won't depend on its type. */
6146 TREE_TYPE (dummy) = integer_type_node;
6147 DECL_ARG_TYPE (dummy) = integer_type_node;
6148 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6152 /* Now pushdecl the enum constants. */
6153 for (parm = others; parm; parm = next)
6155 next = TREE_CHAIN (parm);
6156 if (DECL_NAME (parm) == 0)
6158 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6160 else if (TREE_CODE (parm) != PARM_DECL)
6164 storetags (chainon (parmtags, gettags ()));
6168 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6169 each with a parm name as the TREE_VALUE.
6171 PARMDECLS is a chain of declarations for parameters.
6172 Warning! It can also contain CONST_DECLs which are not parameters
6173 but are names of enumerators of any enum types
6174 declared among the parameters.
6176 First match each formal parameter name with its declaration.
6177 Associate decls with the names and store the decls
6178 into the TREE_PURPOSE slots. */
6180 /* We use DECL_WEAK as a flag to show which parameters have been
6181 seen already since it is not used on PARM_DECL or CONST_DECL. */
6182 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6183 DECL_WEAK (parm) = 0;
6185 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6187 register tree tail, found = NULL;
6189 if (TREE_VALUE (parm) == 0)
6191 error_with_decl (fndecl,
6192 "parameter name missing from parameter list");
6193 TREE_PURPOSE (parm) = 0;
6197 /* See if any of the parmdecls specifies this parm by name.
6198 Ignore any enumerator decls. */
6199 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6200 if (DECL_NAME (tail) == TREE_VALUE (parm)
6201 && TREE_CODE (tail) == PARM_DECL)
6207 /* If declaration already marked, we have a duplicate name.
6208 Complain, and don't use this decl twice. */
6209 if (found && DECL_WEAK (found))
6211 error_with_decl (found, "multiple parameters named `%s'");
6215 /* If the declaration says "void", complain and ignore it. */
6216 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6218 error_with_decl (found, "parameter `%s' declared void");
6219 TREE_TYPE (found) = integer_type_node;
6220 DECL_ARG_TYPE (found) = integer_type_node;
6221 layout_decl (found, 0);
6224 /* Traditionally, a parm declared float is actually a double. */
6225 if (found && flag_traditional
6226 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6228 TREE_TYPE (found) = double_type_node;
6229 DECL_ARG_TYPE (found) = double_type_node;
6230 layout_decl (found, 0);
6233 /* If no declaration found, default to int. */
6236 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6238 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6239 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6240 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6242 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6243 else if (extra_warnings)
6244 warning_with_decl (found, "type of `%s' defaults to `int'");
6248 TREE_PURPOSE (parm) = found;
6250 /* Mark this decl as "already found". */
6251 DECL_WEAK (found) = 1;
6254 /* Put anything which is on the parmdecls chain and which is
6255 not a PARM_DECL onto the list NONPARMS. (The types of
6256 non-parm things which might appear on the list include
6257 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6258 any actual PARM_DECLs not matched with any names. */
6261 for (parm = parmdecls; parm;)
6263 tree next = TREE_CHAIN (parm);
6264 TREE_CHAIN (parm) = 0;
6266 if (TREE_CODE (parm) != PARM_DECL)
6267 nonparms = chainon (nonparms, parm);
6270 /* Complain about args with incomplete types. */
6271 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6273 error_with_decl (parm, "parameter `%s' has incomplete type");
6274 TREE_TYPE (parm) = error_mark_node;
6277 if (! DECL_WEAK (parm))
6279 error_with_decl (parm,
6280 "declaration for parameter `%s' but no such parameter");
6281 /* Pretend the parameter was not missing.
6282 This gets us to a standard state and minimizes
6283 further error messages. */
6285 = chainon (specparms,
6286 tree_cons (parm, NULL_TREE, NULL_TREE));
6293 /* Chain the declarations together in the order of the list of
6294 names. Store that chain in the function decl, replacing the
6297 DECL_ARGUMENTS (fndecl) = 0;
6300 for (last = 0; parm; parm = TREE_CHAIN (parm))
6301 if (TREE_PURPOSE (parm))
6304 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6306 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6307 last = TREE_PURPOSE (parm);
6308 TREE_CHAIN (last) = 0;
6312 /* If there was a previous prototype,
6313 set the DECL_ARG_TYPE of each argument according to
6314 the type previously specified, and report any mismatches. */
6316 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6319 for (parm = DECL_ARGUMENTS (fndecl),
6320 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6321 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6322 != void_type_node));
6323 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6325 if (parm == 0 || type == 0
6326 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6328 error ("number of arguments doesn't match prototype");
6329 error_with_file_and_line (current_function_prototype_file,
6330 current_function_prototype_line,
6331 "prototype declaration");
6334 /* Type for passing arg must be consistent
6335 with that declared for the arg. */
6336 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6338 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6339 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6341 /* Adjust argument to match prototype. E.g. a previous
6342 `int foo(float);' prototype causes
6343 `int foo(x) float x; {...}' to be treated like
6344 `int foo(float x) {...}'. This is particularly
6345 useful for argument types like uid_t. */
6346 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6348 if (PROMOTE_PROTOTYPES
6349 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6350 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6351 && TYPE_PRECISION (TREE_TYPE (parm))
6352 < TYPE_PRECISION (integer_type_node))
6353 DECL_ARG_TYPE (parm) = integer_type_node;
6357 pedwarn ("promoted argument `%s' doesn't match prototype",
6358 IDENTIFIER_POINTER (DECL_NAME (parm)));
6359 warning_with_file_and_line
6360 (current_function_prototype_file,
6361 current_function_prototype_line,
6362 "prototype declaration");
6365 /* If -traditional, allow `int' argument to match
6366 `unsigned' prototype. */
6367 else if (! (flag_traditional
6368 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6369 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6371 error ("argument `%s' doesn't match prototype",
6372 IDENTIFIER_POINTER (DECL_NAME (parm)));
6373 error_with_file_and_line (current_function_prototype_file,
6374 current_function_prototype_line,
6375 "prototype declaration");
6379 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6382 /* Otherwise, create a prototype that would match. */
6386 tree actual = 0, last = 0, type;
6388 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6390 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6392 TREE_CHAIN (last) = type;
6397 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6399 TREE_CHAIN (last) = type;
6403 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6404 of the type of this function, but we need to avoid having this
6405 affect the types of other similarly-typed functions, so we must
6406 first force the generation of an identical (but separate) type
6407 node for the relevant function type. The new node we create
6408 will be a variant of the main variant of the original function
6411 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6413 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6416 /* Now store the final chain of decls for the arguments
6417 as the decl-chain of the current lexical scope.
6418 Put the enumerators in as well, at the front so that
6419 DECL_ARGUMENTS is not modified. */
6421 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6424 /* Make sure the binding level for the top of the function body
6425 gets a BLOCK if there are any in the function.
6426 Otherwise, the dbx output is wrong. */
6428 keep_next_if_subblocks = 1;
6430 /* ??? This might be an improvement,
6431 but needs to be thought about some more. */
6433 keep_next_level_flag = 1;
6436 /* Write a record describing this function definition to the prototypes
6437 file (if requested). */
6439 gen_aux_info_record (fndecl, 1, 0, prototype);
6441 /* Initialize the RTL code for the function. */
6443 init_function_start (fndecl, input_filename, lineno);
6445 /* Begin the statement tree for this function. */
6446 DECL_LANG_SPECIFIC (current_function_decl)
6447 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6448 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6450 /* This function is being processed in whole-function mode. */
6451 cfun->x_whole_function_mode_p = 1;
6453 /* Even though we're inside a function body, we still don't want to
6454 call expand_expr to calculate the size of a variable-sized array.
6455 We haven't necessarily assigned RTL to all variables yet, so it's
6456 not safe to try to expand expressions involving them. */
6457 immediate_size_expand = 0;
6458 cfun->x_dont_save_pending_sizes_p = 1;
6461 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6462 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6463 stands for an ellipsis in the identifier list.
6465 PARMLIST is the data returned by get_parm_info for the
6466 parmlist that follows the semicolon.
6468 We return a value of the same sort that get_parm_info returns,
6469 except that it describes the combination of identifiers and parmlist. */
6472 combine_parm_decls (specparms, parmlist, void_at_end)
6473 tree specparms, parmlist;
6476 register tree fndecl = current_function_decl;
6479 tree parmdecls = TREE_PURPOSE (parmlist);
6481 /* This is a chain of any other decls that came in among the parm
6482 declarations. They were separated already by get_parm_info,
6483 so we just need to keep them separate. */
6484 tree nonparms = TREE_VALUE (parmlist);
6488 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6489 DECL_WEAK (parm) = 0;
6491 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6493 register tree tail, found = NULL;
6495 /* See if any of the parmdecls specifies this parm by name. */
6496 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6497 if (DECL_NAME (tail) == TREE_VALUE (parm))
6503 /* If declaration already marked, we have a duplicate name.
6504 Complain, and don't use this decl twice. */
6505 if (found && DECL_WEAK (found))
6507 error_with_decl (found, "multiple parameters named `%s'");
6511 /* If the declaration says "void", complain and ignore it. */
6512 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6514 error_with_decl (found, "parameter `%s' declared void");
6515 TREE_TYPE (found) = integer_type_node;
6516 DECL_ARG_TYPE (found) = integer_type_node;
6517 layout_decl (found, 0);
6520 /* Traditionally, a parm declared float is actually a double. */
6521 if (found && flag_traditional
6522 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6524 TREE_TYPE (found) = double_type_node;
6525 DECL_ARG_TYPE (found) = double_type_node;
6526 layout_decl (found, 0);
6529 /* If no declaration found, default to int. */
6532 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6534 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6535 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6536 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6537 error_with_decl (found, "type of parameter `%s' is not declared");
6541 TREE_PURPOSE (parm) = found;
6543 /* Mark this decl as "already found". */
6544 DECL_WEAK (found) = 1;
6547 /* Complain about any actual PARM_DECLs not matched with any names. */
6549 for (parm = parmdecls; parm;)
6551 tree next = TREE_CHAIN (parm);
6552 TREE_CHAIN (parm) = 0;
6554 /* Complain about args with incomplete types. */
6555 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6557 error_with_decl (parm, "parameter `%s' has incomplete type");
6558 TREE_TYPE (parm) = error_mark_node;
6561 if (! DECL_WEAK (parm))
6563 error_with_decl (parm,
6564 "declaration for parameter `%s' but no such parameter");
6565 /* Pretend the parameter was not missing.
6566 This gets us to a standard state and minimizes
6567 further error messages. */
6569 = chainon (specparms,
6570 tree_cons (parm, NULL_TREE, NULL_TREE));
6576 /* Chain the declarations together in the order of the list of names.
6577 At the same time, build up a list of their types, in reverse order. */
6583 for (last = 0; parm; parm = TREE_CHAIN (parm))
6584 if (TREE_PURPOSE (parm))
6587 parmdecls = TREE_PURPOSE (parm);
6589 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6590 last = TREE_PURPOSE (parm);
6591 TREE_CHAIN (last) = 0;
6593 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6598 return tree_cons (parmdecls, nonparms,
6599 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6601 return tree_cons (parmdecls, nonparms, nreverse (types));
6604 /* Finish up a function declaration and compile that function
6605 all the way to assembler language output. The free the storage
6606 for the function definition.
6608 This is called after parsing the body of the function definition.
6610 NESTED is nonzero if the function being finished is nested in another. */
6613 finish_function (nested)
6616 register tree fndecl = current_function_decl;
6618 /* TREE_READONLY (fndecl) = 1;
6619 This caused &foo to be of type ptr-to-const-function
6620 which then got a warning when stored in a ptr-to-function variable. */
6623 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6625 /* Must mark the RESULT_DECL as being in this function. */
6627 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6629 /* Obey `register' declarations if `setjmp' is called in this fn. */
6630 if (flag_traditional && current_function_calls_setjmp)
6632 setjmp_protect (DECL_INITIAL (fndecl));
6633 setjmp_protect_args ();
6636 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6638 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6639 != integer_type_node)
6641 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6642 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6644 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6648 #ifdef DEFAULT_MAIN_RETURN
6649 /* Make it so that `main' always returns success by default. */
6650 DEFAULT_MAIN_RETURN;
6653 c_expand_return (integer_zero_node);
6658 /* Tie off the statement tree for this function. */
6659 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6660 /* Clear out memory we no longer need. */
6661 free_after_parsing (cfun);
6662 /* Since we never call rest_of_compilation, we never clear
6663 CFUN. Do so explicitly. */
6664 free_after_compilation (cfun);
6669 /* Generate RTL for the body of this function. */
6670 c_expand_body (fndecl, nested);
6671 /* Let the error reporting routines know that we're outside a
6672 function. For a nested function, this value is used in
6673 pop_c_function_context and then reset via pop_function_context. */
6674 current_function_decl = NULL;
6678 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6679 then we are already in the process of generating RTL for another
6683 c_expand_body (fndecl, nested_p)
6687 /* Squirrel away our current state. */
6689 push_function_context ();
6691 /* Initialize the RTL code for the function. */
6692 current_function_decl = fndecl;
6693 init_function_start (fndecl, input_filename, lineno);
6695 /* This function is being processed in whole-function mode. */
6696 cfun->x_whole_function_mode_p = 1;
6698 /* Even though we're inside a function body, we still don't want to
6699 call expand_expr to calculate the size of a variable-sized array.
6700 We haven't necessarily assigned RTL to all variables yet, so it's
6701 not safe to try to expand expressions involving them. */
6702 immediate_size_expand = 0;
6703 cfun->x_dont_save_pending_sizes_p = 1;
6705 /* Set up parameters and prepare for return, for the function. */
6706 expand_function_start (fndecl, 0);
6708 /* If this function is `main', emit a call to `__main'
6709 to run global initializers, etc. */
6710 if (DECL_NAME (fndecl)
6711 && MAIN_NAME_P (DECL_NAME (fndecl))
6712 && DECL_CONTEXT (fndecl) == NULL_TREE)
6713 expand_main_function ();
6715 /* If this is a varargs function, inform function.c. */
6716 if (c_function_varargs)
6719 /* Generate the RTL for this function. */
6720 expand_stmt (DECL_SAVED_TREE (fndecl));
6721 /* Allow the body of the function to be garbage collected. */
6722 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6724 /* We hard-wired immediate_size_expand to zero in start_function.
6725 expand_function_end will decrement this variable. So, we set the
6726 variable to one here, so that after the decrement it will remain
6728 immediate_size_expand = 1;
6730 /* Allow language dialects to perform special processing. */
6731 if (lang_expand_function_end)
6732 (*lang_expand_function_end) ();
6734 /* Generate rtl for function exit. */
6735 expand_function_end (input_filename, lineno, 0);
6737 /* So we can tell if jump_optimize sets it to 1. */
6740 /* If this is a nested function, protect the local variables in the stack
6741 above us from being collected while we're compiling this function. */
6743 ggc_push_context ();
6745 /* Run the optimizers and output the assembler code for this function. */
6746 rest_of_compilation (fndecl);
6748 /* Undo the GC context switch. */
6752 current_function_returns_null |= can_reach_end;
6754 if (warn_missing_noreturn
6755 && !TREE_THIS_VOLATILE (fndecl)
6756 && !current_function_returns_null
6757 && !current_function_returns_value)
6758 warning ("function might be possible candidate for attribute `noreturn'");
6760 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6761 warning ("`noreturn' function does return");
6762 else if (warn_return_type && can_reach_end
6763 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6764 /* If this function returns non-void and control can drop through,
6766 warning ("control reaches end of non-void function");
6767 /* With just -W, complain only if function returns both with
6768 and without a value. */
6769 else if (extra_warnings
6770 && current_function_returns_value && current_function_returns_null)
6771 warning ("this function may return with or without a value");
6773 /* If requested, warn about function definitions where the function will
6774 return a value (usually of some struct or union type) which itself will
6775 take up a lot of stack space. */
6777 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6779 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6781 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6782 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6785 unsigned int size_as_int
6786 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6788 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6789 warning_with_decl (fndecl,
6790 "size of return value of `%s' is %u bytes",
6793 warning_with_decl (fndecl,
6794 "size of return value of `%s' is larger than %d bytes",
6799 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6801 /* Stop pointing to the local nodes about to be freed.
6802 But DECL_INITIAL must remain nonzero so we know this
6803 was an actual function definition.
6804 For a nested function, this is done in pop_c_function_context.
6805 If rest_of_compilation set this to 0, leave it 0. */
6806 if (DECL_INITIAL (fndecl) != 0)
6807 DECL_INITIAL (fndecl) = error_mark_node;
6809 DECL_ARGUMENTS (fndecl) = 0;
6812 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6814 #ifndef ASM_OUTPUT_CONSTRUCTOR
6815 if (! flag_gnu_linker)
6816 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6819 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6822 if (DECL_STATIC_DESTRUCTOR (fndecl))
6824 #ifndef ASM_OUTPUT_DESTRUCTOR
6825 if (! flag_gnu_linker)
6826 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6829 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6834 /* Return to the enclosing function. */
6835 pop_function_context ();
6836 /* If the nested function was inline, write it out if that is
6838 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6840 push_function_context ();
6841 output_inline_function (fndecl);
6842 pop_function_context ();
6848 /* Save and restore the variables in this file and elsewhere
6849 that keep track of the progress of compilation of the current function.
6850 Used for nested functions. */
6852 struct c_language_function
6854 struct language_function base;
6856 tree shadowed_labels;
6859 int warn_about_return_type;
6861 struct binding_level *binding_level;
6864 /* Save and reinitialize the variables
6865 used during compilation of a C function. */
6868 push_c_function_context (f)
6871 struct c_language_function *p;
6872 p = ((struct c_language_function *)
6873 xmalloc (sizeof (struct c_language_function)));
6874 f->language = (struct language_function *) p;
6876 p->base.x_stmt_tree = c_stmt_tree;
6877 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6878 p->base.x_function_name_declared_p = c_function_name_declared_p;
6879 p->named_labels = named_labels;
6880 p->shadowed_labels = shadowed_labels;
6881 p->returns_value = current_function_returns_value;
6882 p->returns_null = current_function_returns_null;
6883 p->warn_about_return_type = warn_about_return_type;
6884 p->extern_inline = current_extern_inline;
6885 p->binding_level = current_binding_level;
6888 /* Restore the variables used during compilation of a C function. */
6891 pop_c_function_context (f)
6894 struct c_language_function *p
6895 = (struct c_language_function *) f->language;
6898 /* Bring back all the labels that were shadowed. */
6899 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6900 if (DECL_NAME (TREE_VALUE (link)) != 0)
6901 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6902 = TREE_VALUE (link);
6904 if (DECL_SAVED_INSNS (current_function_decl) == 0
6905 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6907 /* Stop pointing to the local nodes about to be freed. */
6908 /* But DECL_INITIAL must remain nonzero so we know this
6909 was an actual function definition. */
6910 DECL_INITIAL (current_function_decl) = error_mark_node;
6911 DECL_ARGUMENTS (current_function_decl) = 0;
6914 c_stmt_tree = p->base.x_stmt_tree;
6915 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6916 c_function_name_declared_p = p->base.x_function_name_declared_p;
6917 named_labels = p->named_labels;
6918 shadowed_labels = p->shadowed_labels;
6919 current_function_returns_value = p->returns_value;
6920 current_function_returns_null = p->returns_null;
6921 warn_about_return_type = p->warn_about_return_type;
6922 current_extern_inline = p->extern_inline;
6923 current_binding_level = p->binding_level;
6929 /* Mark the language specific parts of F for GC. */
6932 mark_c_function_context (f)
6935 struct c_language_function *p
6936 = (struct c_language_function *) f->language;
6941 mark_c_language_function (&p->base);
6942 ggc_mark_tree (p->shadowed_labels);
6943 ggc_mark_tree (p->named_labels);
6944 mark_binding_level (&p->binding_level);
6947 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6950 copy_lang_decl (decl)
6953 struct lang_decl *ld;
6955 if (!DECL_LANG_SPECIFIC (decl))
6958 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6959 bcopy ((char *)DECL_LANG_SPECIFIC (decl), (char *)ld,
6960 sizeof (struct lang_decl));
6961 DECL_LANG_SPECIFIC (decl) = ld;
6964 /* Mark ARG for GC. */
6967 lang_mark_false_label_stack (arg)
6968 struct label_node *arg;
6970 /* C doesn't use false_label_stack. It better be NULL. */
6975 /* Mark the language specific bits in T for GC. */
6981 if (TREE_CODE (t) == IDENTIFIER_NODE)
6983 struct lang_identifier *i = (struct lang_identifier *) t;
6984 ggc_mark_tree (i->global_value);
6985 ggc_mark_tree (i->local_value);
6986 ggc_mark_tree (i->label_value);
6987 ggc_mark_tree (i->implicit_decl);
6988 ggc_mark_tree (i->error_locus);
6989 ggc_mark_tree (i->limbo_value);
6991 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6992 ggc_mark (TYPE_LANG_SPECIFIC (t));
6993 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
6995 ggc_mark (DECL_LANG_SPECIFIC (t));
6996 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7000 /* The functions below are required for functionality of doing
7001 function at once processing in the C front end. Currently these
7002 functions are not called from anywhere in the C front end, but as
7003 these changes continue, that will change. */
7005 /* Returns non-zero if the current statement is a full expression,
7006 i.e. temporaries created during that statement should be destroyed
7007 at the end of the statement. */
7010 stmts_are_full_exprs_p ()
7015 /* Returns the stmt_tree (if any) to which statements are currently
7016 being added. If there is no active statement-tree, NULL is
7020 current_stmt_tree ()
7022 return &c_stmt_tree;
7025 /* Returns the stack of SCOPE_STMTs for the current function. */
7028 current_scope_stmt_stack ()
7030 return &c_scope_stmt_stack;
7033 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7037 anon_aggr_type_p (node)
7038 tree node ATTRIBUTE_UNUSED;
7043 /* Dummy function in place of callback used by C++. */
7046 extract_interface_info ()
7050 /* Return a new COMPOUND_STMT, after adding it to the current
7054 c_begin_compound_stmt ()
7058 /* Create the COMPOUND_STMT. */
7059 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7060 /* If we haven't already declared __FUNCTION__ and its ilk then this
7061 is the opening curly brace of the function. Declare them now. */
7062 if (!c_function_name_declared_p)
7064 c_function_name_declared_p = 1;
7065 declare_function_name ();
7071 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7075 c_expand_decl_stmt (t)
7078 tree decl = DECL_STMT_DECL (t);
7080 /* Expand nested functions. */
7081 if (TREE_CODE (decl) == FUNCTION_DECL
7082 && DECL_CONTEXT (decl) == current_function_decl
7083 && DECL_SAVED_TREE (decl))
7084 c_expand_body (decl, /*nested_p=*/1);