1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* Process declarations and symbol lookup for C front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
48 extern cpp_reader parse_in;
51 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
53 { NORMAL, /* Ordinary declaration */
54 FUNCDEF, /* Function definition */
55 PARM, /* Declaration of parm before function body */
56 FIELD, /* Declaration inside struct or union */
57 BITFIELD, /* Likewise but with specified width */
58 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* We let tm.h override the types used here, to handle trivial differences
61 such as the choice of unsigned int or long unsigned int for size_t.
62 When machines start needing nontrivial differences in the size type,
63 it would be best to do something here to figure out automatically
64 from other information what type to use. */
67 #define SIZE_TYPE "long unsigned int"
71 #define PTRDIFF_TYPE "long int"
75 #define WCHAR_TYPE "int"
81 /* Nonzero if we have seen an invalid cross reference
82 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref;
85 /* File and line to appear in the eventual error message. */
86 const char *pending_invalid_xref_file;
87 int pending_invalid_xref_line;
89 /* While defining an enum type, this is 1 plus the last enumerator
90 constant value. Note that will do not have to save this or `enum_overflow'
91 around nested function definition since such a definition could only
92 occur in an enum value expression and we don't use these variables in
95 static tree enum_next_value;
97 /* Nonzero means that there was overflow computing enum_next_value. */
99 static int enum_overflow;
101 /* Parsing a function declarator leaves a list of parameter names
102 or a chain or parameter decls here. */
104 static tree last_function_parms;
106 /* Parsing a function declarator leaves here a chain of structure
107 and enum types declared in the parmlist. */
109 static tree last_function_parm_tags;
111 /* After parsing the declarator that starts a function definition,
112 `start_function' puts here the list of parameter names or chain of decls.
113 `store_parm_decls' finds it here. */
115 static tree current_function_parms;
117 /* Similar, for last_function_parm_tags. */
118 static tree current_function_parm_tags;
120 /* Similar, for the file and line that the prototype came from if this is
121 an old-style definition. */
122 static const char *current_function_prototype_file;
123 static int current_function_prototype_line;
125 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
126 that have names. Here so we can clear out their names' definitions
127 at the end of the function. */
129 static tree named_labels;
131 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
133 static tree shadowed_labels;
135 /* Nonzero when store_parm_decls is called indicates a varargs function.
136 Value not meaningful after store_parm_decls. */
138 static int c_function_varargs;
140 /* Set to 0 at beginning of a function definition, set to 1 if
141 a return statement that specifies a return value is seen. */
143 int current_function_returns_value;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a return statement with no argument is seen. */
148 int current_function_returns_null;
150 /* Set to nonzero by `grokdeclarator' for a function
151 whose return type is defaulted, if warnings for this are desired. */
153 static int warn_about_return_type;
155 /* Nonzero when starting a function declared `extern inline'. */
157 static int current_extern_inline;
159 /* For each binding contour we allocate a binding_level structure
160 * which records the names defined in that contour.
163 * 1) one for each function definition,
164 * where internal declarations of the parameters appear.
165 * 2) one for each compound statement,
166 * to record its declarations.
168 * The current meaning of a name can be found by searching the levels from
169 * the current one out to the global one.
172 /* Note that the information in the `names' component of the global contour
173 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
177 /* A chain of _DECL nodes for all variables, constants, functions,
178 and typedef types. These are in the reverse of the order supplied.
182 /* A list of structure, union and enum definitions,
183 * for looking up tag names.
184 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
185 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
186 * or ENUMERAL_TYPE node.
190 /* For each level, a list of shadowed outer-level local definitions
191 to be restored when this level is popped.
192 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
193 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
196 /* For each level (except not the global one),
197 a chain of BLOCK nodes for all the levels
198 that were entered and exited one level down. */
201 /* The BLOCK node for this level, if one has been preallocated.
202 If 0, the BLOCK is allocated (if needed) when the level is popped. */
205 /* The binding level which this one is contained in (inherits from). */
206 struct binding_level *level_chain;
208 /* Nonzero for the level that holds the parameters of a function. */
211 /* Nonzero if this level "doesn't exist" for tags. */
212 char tag_transparent;
214 /* Nonzero if sublevels of this level "don't exist" for tags.
215 This is set in the parm level of a function definition
216 while reading the function body, so that the outermost block
217 of the function body will be tag-transparent. */
218 char subblocks_tag_transparent;
220 /* Nonzero means make a BLOCK for this level regardless of all else. */
223 /* Nonzero means make a BLOCK if this level has any subblocks. */
224 char keep_if_subblocks;
226 /* Number of decls in `names' that have incomplete
227 structure or union types. */
230 /* A list of decls giving the (reversed) specified order of parms,
231 not including any forward-decls in the parmlist.
232 This is so we can put the parms in proper order for assign_parms. */
236 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
238 /* The binding level currently in effect. */
240 static struct binding_level *current_binding_level;
242 /* A chain of binding_level structures awaiting reuse. */
244 static struct binding_level *free_binding_level;
246 /* The outermost binding level, for names of file scope.
247 This is created when the compiler is started and exists
248 through the entire run. */
250 static struct binding_level *global_binding_level;
252 /* Binding level structures are initialized by copying this one. */
254 static struct binding_level clear_binding_level
255 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
258 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
260 static int keep_next_level_flag;
262 /* Nonzero means make a BLOCK for the next level pushed
263 if it has subblocks. */
265 static int keep_next_if_subblocks;
267 /* The chain of outer levels of label scopes.
268 This uses the same data structure used for binding levels,
269 but it works differently: each link in the chain records
270 saved values of named_labels and shadowed_labels for
271 a label binding level outside the current one. */
273 static struct binding_level *label_level_chain;
275 /* Functions called automatically at the beginning and end of execution. */
277 tree static_ctors, static_dtors;
279 /* Forward declarations. */
281 static struct binding_level * make_binding_level PARAMS ((void));
282 static void mark_binding_level PARAMS ((void *));
283 static void clear_limbo_values PARAMS ((tree));
284 static int duplicate_decls PARAMS ((tree, tree, int));
285 static int redeclaration_error_message PARAMS ((tree, tree));
286 static void storedecls PARAMS ((tree));
287 static void storetags PARAMS ((tree));
288 static tree lookup_tag PARAMS ((enum tree_code, tree,
289 struct binding_level *, int));
290 static tree lookup_tag_reverse PARAMS ((tree));
291 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
293 static tree grokparms PARAMS ((tree, int));
294 static void layout_array_type PARAMS ((tree));
295 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
297 /* C-specific option variables. */
299 /* Nonzero means allow type mismatches in conditional expressions;
300 just make their values `void'. */
302 int flag_cond_mismatch;
304 /* Nonzero means give `double' the same size as `float'. */
306 int flag_short_double;
308 /* Nonzero means give `wchar_t' the same size as `short'. */
310 int flag_short_wchar;
312 /* Nonzero means don't recognize the keyword `asm'. */
316 /* Nonzero means don't recognize any builtin functions. */
320 /* Nonzero means don't recognize the non-ANSI builtin functions.
323 int flag_no_nonansi_builtin;
325 /* Nonzero means do some things the same way PCC does. */
327 int flag_traditional;
329 /* Nonzero means use the ISO C99 dialect of C. */
333 /* Nonzero means accept digraphs. */
335 int flag_digraphs = 1;
337 /* Nonzero means that we have builtin functions, and main is an int */
341 /* Nonzero means to allow single precision math even if we're generally
342 being traditional. */
343 int flag_allow_single_precision = 0;
345 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
347 int flag_signed_bitfields = 1;
348 int explicit_flag_signed_bitfields = 0;
350 /* Nonzero means warn about use of implicit int. */
352 int warn_implicit_int;
354 /* Nonzero means warn about usage of long long when `-pedantic'. */
356 int warn_long_long = 1;
358 /* Nonzero means message about use of implicit function declarations;
359 1 means warning; 2 means error. */
361 int mesg_implicit_function_declaration;
363 /* Nonzero means give string constants the type `const char *'
364 to get extra warnings from them. These warnings will be too numerous
365 to be useful, except in thoroughly ANSIfied programs. */
367 int flag_const_strings;
369 /* Nonzero means warn about pointer casts that can drop a type qualifier
370 from the pointer target type. */
374 /* Nonzero means warn when casting a function call to a type that does
375 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
376 when there is no previous declaration of sqrt or malloc. */
378 int warn_bad_function_cast;
380 /* Warn about functions which might be candidates for attribute noreturn. */
382 int warn_missing_noreturn;
384 /* Warn about traditional constructs whose meanings changed in ANSI C. */
386 int warn_traditional;
388 /* Nonzero means warn about sizeof(function) or addition/subtraction
389 of function pointers. */
391 int warn_pointer_arith;
393 /* Nonzero means warn for non-prototype function decls
394 or non-prototyped defs without previous prototype. */
396 int warn_strict_prototypes;
398 /* Nonzero means warn for any global function def
399 without separate previous prototype decl. */
401 int warn_missing_prototypes;
403 /* Nonzero means warn for any global function def
404 without separate previous decl. */
406 int warn_missing_declarations;
408 /* Nonzero means warn about multiple (redundant) decls for the same single
409 variable or function. */
411 int warn_redundant_decls = 0;
413 /* Nonzero means warn about extern declarations of objects not at
414 file-scope level and about *all* declarations of functions (whether
415 extern or static) not at file-scope level. Note that we exclude
416 implicit function declarations. To get warnings about those, use
419 int warn_nested_externs = 0;
421 /* Warn about *printf or *scanf format/argument anomalies. */
425 /* Warn about a subscript that has type char. */
427 int warn_char_subscripts = 0;
429 /* Warn if a type conversion is done that might have confusing results. */
433 /* Warn if adding () is suggested. */
435 int warn_parentheses;
437 /* Warn if initializer is not completely bracketed. */
439 int warn_missing_braces;
441 /* Warn if main is suspicious. */
445 /* Warn about #pragma directives that are not recognised. */
447 int warn_unknown_pragmas = 0; /* Tri state variable. */
449 /* Warn about comparison of signed and unsigned values.
450 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
452 int warn_sign_compare = -1;
454 /* Warn about testing equality of floating point numbers. */
456 int warn_float_equal = 0;
458 /* Nonzero means warn about use of multicharacter literals. */
460 int warn_multichar = 1;
462 /* Wrapper since C and C++ expand_expr_stmt are different. */
464 expand_expr_stmt_fn lang_expand_expr_stmt = c_expand_expr_stmt;
466 /* The variant of the C language being processed. */
468 c_language_kind c_language = clk_c;
470 /* Nonzero means `$' can be in an identifier. */
472 #ifndef DOLLARS_IN_IDENTIFIERS
473 #define DOLLARS_IN_IDENTIFIERS 1
475 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
477 /* Decode the string P as a language-specific option for C.
478 Return the number of strings consumed. Should not complain
479 if it does not recognise the option. */
482 c_decode_option (argc, argv)
483 int argc ATTRIBUTE_UNUSED;
486 int strings_processed;
489 strings_processed = cpp_handle_option (&parse_in, argc, argv);
491 strings_processed = 0;
492 #endif /* ! USE_CPPLIB */
494 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
496 flag_traditional = 1;
497 flag_writable_strings = 1;
500 else if (!strcmp (p, "-fallow-single-precision"))
501 flag_allow_single_precision = 1;
502 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
507 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
511 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
515 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
517 flag_traditional = 0;
518 flag_writable_strings = 0;
521 else if (!strncmp (p, "-std=", 5))
523 /* Select the appropriate language standard. We currently
525 -std=iso9899:1990 same as -ansi
526 -std=iso9899:199409 ISO C as modified in amend. 1
527 -std=iso9899:1999 ISO C 99
528 -std=c89 same as -std=iso9899:1990
529 -std=c99 same as -std=iso9899:1999
530 -std=gnu89 default, iso9899:1990 + gnu extensions
531 -std=gnu99 iso9899:1999 + gnu extensions
533 const char *argstart = &p[5];
535 if (!strcmp (argstart, "iso9899:1990")
536 || !strcmp (argstart, "c89"))
541 flag_traditional = 0;
542 flag_writable_strings = 0;
544 flag_no_nonansi_builtin = 1;
547 else if (!strcmp (argstart, "iso9899:199409"))
550 /* ??? The other changes since ISO C 1990 are not supported. */
551 goto iso_1990_digraphs;
553 else if (!strcmp (argstart, "iso9899:199x")
554 || !strcmp (argstart, "iso9899:1999")
555 || !strcmp (argstart, "c9x")
556 || !strcmp (argstart, "c99"))
558 flag_traditional = 0;
559 flag_writable_strings = 0;
561 flag_no_nonansi_builtin = 1;
565 else if (!strcmp (argstart, "gnu89"))
567 flag_traditional = 0;
568 flag_writable_strings = 0;
570 flag_no_nonansi_builtin = 0;
574 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
576 flag_traditional = 0;
577 flag_writable_strings = 0;
579 flag_no_nonansi_builtin = 0;
584 error ("unknown C standard `%s'", argstart);
586 else if (!strcmp (p, "-fdollars-in-identifiers"))
587 dollars_in_ident = 1;
588 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
589 dollars_in_ident = 0;
590 else if (!strcmp (p, "-fsigned-char"))
591 flag_signed_char = 1;
592 else if (!strcmp (p, "-funsigned-char"))
593 flag_signed_char = 0;
594 else if (!strcmp (p, "-fno-signed-char"))
595 flag_signed_char = 0;
596 else if (!strcmp (p, "-fno-unsigned-char"))
597 flag_signed_char = 1;
598 else if (!strcmp (p, "-fsigned-bitfields")
599 || !strcmp (p, "-fno-unsigned-bitfields"))
601 flag_signed_bitfields = 1;
602 explicit_flag_signed_bitfields = 1;
604 else if (!strcmp (p, "-funsigned-bitfields")
605 || !strcmp (p, "-fno-signed-bitfields"))
607 flag_signed_bitfields = 0;
608 explicit_flag_signed_bitfields = 1;
610 else if (!strcmp (p, "-fshort-enums"))
611 flag_short_enums = 1;
612 else if (!strcmp (p, "-fno-short-enums"))
613 flag_short_enums = 0;
614 else if (!strcmp (p, "-fshort-wchar"))
615 flag_short_wchar = 1;
616 else if (!strcmp (p, "-fno-short-wchar"))
617 flag_short_wchar = 0;
618 else if (!strcmp (p, "-fcond-mismatch"))
619 flag_cond_mismatch = 1;
620 else if (!strcmp (p, "-fno-cond-mismatch"))
621 flag_cond_mismatch = 0;
622 else if (!strcmp (p, "-fshort-double"))
623 flag_short_double = 1;
624 else if (!strcmp (p, "-fno-short-double"))
625 flag_short_double = 0;
626 else if (!strcmp (p, "-fasm"))
628 else if (!strcmp (p, "-fno-asm"))
630 else if (!strcmp (p, "-fbuiltin"))
632 else if (!strcmp (p, "-fno-builtin"))
634 else if (!strcmp (p, "-ansi"))
636 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
637 mesg_implicit_function_declaration = 2;
638 else if (!strcmp (p, "-Wimplicit-function-declaration"))
639 mesg_implicit_function_declaration = 1;
640 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
641 mesg_implicit_function_declaration = 0;
642 else if (!strcmp (p, "-Wimplicit-int"))
643 warn_implicit_int = 1;
644 else if (!strcmp (p, "-Wno-implicit-int"))
645 warn_implicit_int = 0;
646 else if (!strcmp (p, "-Wimplicit"))
648 warn_implicit_int = 1;
649 if (mesg_implicit_function_declaration != 2)
650 mesg_implicit_function_declaration = 1;
652 else if (!strcmp (p, "-Wno-implicit"))
653 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
654 else if (!strcmp (p, "-Wlong-long"))
656 else if (!strcmp (p, "-Wno-long-long"))
658 else if (!strcmp (p, "-Wwrite-strings"))
659 flag_const_strings = 1;
660 else if (!strcmp (p, "-Wno-write-strings"))
661 flag_const_strings = 0;
662 else if (!strcmp (p, "-Wcast-qual"))
664 else if (!strcmp (p, "-Wno-cast-qual"))
666 else if (!strcmp (p, "-Wbad-function-cast"))
667 warn_bad_function_cast = 1;
668 else if (!strcmp (p, "-Wno-bad-function-cast"))
669 warn_bad_function_cast = 0;
670 else if (!strcmp (p, "-Wmissing-noreturn"))
671 warn_missing_noreturn = 1;
672 else if (!strcmp (p, "-Wno-missing-noreturn"))
673 warn_missing_noreturn = 0;
674 else if (!strcmp (p, "-Wpointer-arith"))
675 warn_pointer_arith = 1;
676 else if (!strcmp (p, "-Wno-pointer-arith"))
677 warn_pointer_arith = 0;
678 else if (!strcmp (p, "-Wstrict-prototypes"))
679 warn_strict_prototypes = 1;
680 else if (!strcmp (p, "-Wno-strict-prototypes"))
681 warn_strict_prototypes = 0;
682 else if (!strcmp (p, "-Wmissing-prototypes"))
683 warn_missing_prototypes = 1;
684 else if (!strcmp (p, "-Wno-missing-prototypes"))
685 warn_missing_prototypes = 0;
686 else if (!strcmp (p, "-Wmissing-declarations"))
687 warn_missing_declarations = 1;
688 else if (!strcmp (p, "-Wno-missing-declarations"))
689 warn_missing_declarations = 0;
690 else if (!strcmp (p, "-Wredundant-decls"))
691 warn_redundant_decls = 1;
692 else if (!strcmp (p, "-Wno-redundant-decls"))
693 warn_redundant_decls = 0;
694 else if (!strcmp (p, "-Wnested-externs"))
695 warn_nested_externs = 1;
696 else if (!strcmp (p, "-Wno-nested-externs"))
697 warn_nested_externs = 0;
698 else if (!strcmp (p, "-Wtraditional"))
699 warn_traditional = 1;
700 else if (!strcmp (p, "-Wno-traditional"))
701 warn_traditional = 0;
702 else if (!strncmp (p, "-Wformat=", 9))
703 warn_format = atol (p + 9);
704 else if (!strcmp (p, "-Wformat"))
706 else if (!strcmp (p, "-Wno-format"))
708 else if (!strcmp (p, "-Wchar-subscripts"))
709 warn_char_subscripts = 1;
710 else if (!strcmp (p, "-Wno-char-subscripts"))
711 warn_char_subscripts = 0;
712 else if (!strcmp (p, "-Wconversion"))
714 else if (!strcmp (p, "-Wno-conversion"))
716 else if (!strcmp (p, "-Wparentheses"))
717 warn_parentheses = 1;
718 else if (!strcmp (p, "-Wno-parentheses"))
719 warn_parentheses = 0;
720 else if (!strcmp (p, "-Wreturn-type"))
721 warn_return_type = 1;
722 else if (!strcmp (p, "-Wno-return-type"))
723 warn_return_type = 0;
724 else if (!strcmp (p, "-Wcomment"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wno-comment"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wcomments"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wno-comments"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wtrigraphs"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wno-trigraphs"))
735 ; /* cpp handles this one. */
736 else if (!strcmp (p, "-Wundef"))
737 ; /* cpp handles this one. */
738 else if (!strcmp (p, "-Wno-undef"))
739 ; /* cpp handles this one. */
740 else if (!strcmp (p, "-Wimport"))
741 ; /* cpp handles this one. */
742 else if (!strcmp (p, "-Wno-import"))
743 ; /* cpp handles this one. */
744 else if (!strcmp (p, "-Wmissing-braces"))
745 warn_missing_braces = 1;
746 else if (!strcmp (p, "-Wno-missing-braces"))
747 warn_missing_braces = 0;
748 else if (!strcmp (p, "-Wmain"))
750 else if (!strcmp (p, "-Wno-main"))
752 else if (!strcmp (p, "-Wsign-compare"))
753 warn_sign_compare = 1;
754 else if (!strcmp (p, "-Wno-sign-compare"))
755 warn_sign_compare = 0;
756 else if (!strcmp (p, "-Wfloat-equal"))
757 warn_float_equal = 1;
758 else if (!strcmp (p, "-Wno-float-equal"))
759 warn_float_equal = 0;
760 else if (!strcmp (p, "-Wmultichar"))
762 else if (!strcmp (p, "-Wno-multichar"))
764 else if (!strcmp (p, "-Wunknown-pragmas"))
765 /* Set to greater than 1, so that even unknown pragmas in system
766 headers will be warned about. */
767 warn_unknown_pragmas = 2;
768 else if (!strcmp (p, "-Wno-unknown-pragmas"))
769 warn_unknown_pragmas = 0;
770 else if (!strcmp (p, "-Wall"))
772 /* We save the value of warn_uninitialized, since if they put
773 -Wuninitialized on the command line, we need to generate a
774 warning about not using it without also specifying -O. */
775 if (warn_uninitialized != 1)
776 warn_uninitialized = 2;
777 warn_implicit_int = 1;
778 mesg_implicit_function_declaration = 1;
779 warn_return_type = 1;
783 warn_char_subscripts = 1;
784 warn_parentheses = 1;
785 warn_missing_braces = 1;
786 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
787 it off only if it's not explicit. */
789 /* Only warn about unknown pragmas that are not in system headers. */
790 warn_unknown_pragmas = 1;
793 return strings_processed;
798 /* Hooks for print_node. */
801 print_lang_decl (file, node, indent)
802 FILE *file ATTRIBUTE_UNUSED;
803 tree node ATTRIBUTE_UNUSED;
804 int indent ATTRIBUTE_UNUSED;
809 print_lang_type (file, node, indent)
810 FILE *file ATTRIBUTE_UNUSED;
811 tree node ATTRIBUTE_UNUSED;
812 int indent ATTRIBUTE_UNUSED;
817 print_lang_identifier (file, node, indent)
822 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
823 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
824 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
825 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
826 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
827 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
830 /* Hook called at end of compilation to assume 1 elt
831 for a top-level array decl that wasn't complete before. */
834 finish_incomplete_decl (decl)
837 if (TREE_CODE (decl) == VAR_DECL)
839 tree type = TREE_TYPE (decl);
840 if (type != error_mark_node
841 && TREE_CODE (type) == ARRAY_TYPE
842 && TYPE_DOMAIN (type) == 0)
844 if (! DECL_EXTERNAL (decl))
845 warning_with_decl (decl, "array `%s' assumed to have one element");
847 complete_array_type (type, NULL_TREE, 1);
849 layout_decl (decl, 0);
854 /* Create a new `struct binding_level'. */
857 struct binding_level *
858 make_binding_level ()
861 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
864 /* Nonzero if we are currently in the global binding level. */
869 return current_binding_level == global_binding_level;
875 keep_next_level_flag = 1;
878 /* Nonzero if the current level needs to have a BLOCK made. */
883 return ((current_binding_level->keep_if_subblocks
884 && current_binding_level->blocks != 0)
885 || current_binding_level->keep
886 || current_binding_level->names != 0
887 || (current_binding_level->tags != 0
888 && !current_binding_level->tag_transparent));
891 /* Identify this binding level as a level of parameters.
892 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
893 But it turns out there is no way to pass the right value for
894 DEFINITION_FLAG, so we ignore it. */
897 declare_parm_level (definition_flag)
898 int definition_flag ATTRIBUTE_UNUSED;
900 current_binding_level->parm_flag = 1;
903 /* Nonzero if currently making parm declarations. */
908 return current_binding_level->parm_flag;
911 /* Enter a new binding level.
912 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
913 not for that of tags. */
916 pushlevel (tag_transparent)
919 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
921 /* If this is the top level of a function,
922 just make sure that NAMED_LABELS is 0. */
924 if (current_binding_level == global_binding_level)
929 /* Reuse or create a struct for this binding level. */
931 if (free_binding_level)
933 newlevel = free_binding_level;
934 free_binding_level = free_binding_level->level_chain;
938 newlevel = make_binding_level ();
941 /* Add this level to the front of the chain (stack) of levels that
944 *newlevel = clear_binding_level;
945 newlevel->tag_transparent
947 || (current_binding_level
948 ? current_binding_level->subblocks_tag_transparent
950 newlevel->level_chain = current_binding_level;
951 current_binding_level = newlevel;
952 newlevel->keep = keep_next_level_flag;
953 keep_next_level_flag = 0;
954 newlevel->keep_if_subblocks = keep_next_if_subblocks;
955 keep_next_if_subblocks = 0;
958 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
961 clear_limbo_values (block)
966 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
967 if (DECL_NAME (tem) != 0)
968 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
970 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
971 clear_limbo_values (tem);
974 /* Exit a binding level.
975 Pop the level off, and restore the state of the identifier-decl mappings
976 that were in effect when this level was entered.
978 If KEEP is nonzero, this level had explicit declarations, so
979 and create a "block" (a BLOCK node) for the level
980 to record its declarations and subblocks for symbol table output.
982 If FUNCTIONBODY is nonzero, this level is the body of a function,
983 so create a block as if KEEP were set and also clear out all
986 If REVERSE is nonzero, reverse the order of decls before putting
987 them into the BLOCK. */
990 poplevel (keep, reverse, functionbody)
996 /* The chain of decls was accumulated in reverse order.
997 Put it into forward order, just for cleanliness. */
999 tree tags = current_binding_level->tags;
1000 tree subblocks = current_binding_level->blocks;
1003 int block_previously_created;
1005 keep |= current_binding_level->keep;
1007 /* This warning is turned off because it causes warnings for
1008 declarations like `extern struct foo *x'. */
1010 /* Warn about incomplete structure types in this level. */
1011 for (link = tags; link; link = TREE_CHAIN (link))
1012 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1014 tree type = TREE_VALUE (link);
1015 tree type_name = TYPE_NAME (type);
1016 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1018 : DECL_NAME (type_name));
1019 switch (TREE_CODE (type))
1022 error ("`struct %s' incomplete in scope ending here", id);
1025 error ("`union %s' incomplete in scope ending here", id);
1028 error ("`enum %s' incomplete in scope ending here", id);
1034 /* Get the decls in the order they were written.
1035 Usually current_binding_level->names is in reverse order.
1036 But parameter decls were previously put in forward order. */
1039 current_binding_level->names
1040 = decls = nreverse (current_binding_level->names);
1042 decls = current_binding_level->names;
1044 /* Output any nested inline functions within this block
1045 if they weren't already output. */
1047 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1048 if (TREE_CODE (decl) == FUNCTION_DECL
1049 && ! TREE_ASM_WRITTEN (decl)
1050 && DECL_INITIAL (decl) != 0
1051 && TREE_ADDRESSABLE (decl))
1053 /* If this decl was copied from a file-scope decl
1054 on account of a block-scope extern decl,
1055 propagate TREE_ADDRESSABLE to the file-scope decl.
1057 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1058 true, since then the decl goes through save_for_inline_copying. */
1059 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1060 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1061 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1062 else if (DECL_SAVED_INSNS (decl) != 0)
1064 push_function_context ();
1065 output_inline_function (decl);
1066 pop_function_context ();
1070 /* If there were any declarations or structure tags in that level,
1071 or if this level is a function body,
1072 create a BLOCK to record them for the life of this function. */
1075 block_previously_created = (current_binding_level->this_block != 0);
1076 if (block_previously_created)
1077 block = current_binding_level->this_block;
1078 else if (keep || functionbody
1079 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1080 block = make_node (BLOCK);
1083 BLOCK_VARS (block) = decls;
1084 BLOCK_SUBBLOCKS (block) = subblocks;
1087 /* In each subblock, record that this is its superior. */
1089 for (link = subblocks; link; link = TREE_CHAIN (link))
1090 BLOCK_SUPERCONTEXT (link) = block;
1092 /* Clear out the meanings of the local variables of this level. */
1094 for (link = decls; link; link = TREE_CHAIN (link))
1096 if (DECL_NAME (link) != 0)
1098 /* If the ident. was used or addressed via a local extern decl,
1099 don't forget that fact. */
1100 if (DECL_EXTERNAL (link))
1102 if (TREE_USED (link))
1103 TREE_USED (DECL_NAME (link)) = 1;
1104 if (TREE_ADDRESSABLE (link))
1105 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1107 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1111 /* Restore all name-meanings of the outer levels
1112 that were shadowed by this level. */
1114 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1115 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1117 /* If the level being exited is the top level of a function,
1118 check over all the labels, and clear out the current
1119 (function local) meanings of their names. */
1123 clear_limbo_values (block);
1125 /* If this is the top level block of a function,
1126 the vars are the function's parameters.
1127 Don't leave them in the BLOCK because they are
1128 found in the FUNCTION_DECL instead. */
1130 BLOCK_VARS (block) = 0;
1132 /* Clear out the definitions of all label names,
1133 since their scopes end here,
1134 and add them to BLOCK_VARS. */
1136 for (link = named_labels; link; link = TREE_CHAIN (link))
1138 register tree label = TREE_VALUE (link);
1140 if (DECL_INITIAL (label) == 0)
1142 error_with_decl (label, "label `%s' used but not defined");
1143 /* Avoid crashing later. */
1144 define_label (input_filename, lineno,
1147 else if (warn_unused_label && !TREE_USED (label))
1148 warning_with_decl (label, "label `%s' defined but not used");
1149 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1151 /* Put the labels into the "variables" of the
1152 top-level block, so debugger can see them. */
1153 TREE_CHAIN (label) = BLOCK_VARS (block);
1154 BLOCK_VARS (block) = label;
1158 /* Pop the current level, and free the structure for reuse. */
1161 register struct binding_level *level = current_binding_level;
1162 current_binding_level = current_binding_level->level_chain;
1164 level->level_chain = free_binding_level;
1165 free_binding_level = level;
1168 /* Dispose of the block that we just made inside some higher level. */
1170 DECL_INITIAL (current_function_decl) = block;
1173 if (!block_previously_created)
1174 current_binding_level->blocks
1175 = chainon (current_binding_level->blocks, block);
1177 /* If we did not make a block for the level just exited,
1178 any blocks made for inner levels
1179 (since they cannot be recorded as subblocks in that level)
1180 must be carried forward so they will later become subblocks
1181 of something else. */
1183 current_binding_level->blocks
1184 = chainon (current_binding_level->blocks, subblocks);
1186 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1187 binding contour so that they point to the appropriate construct, i.e.
1188 either to the current FUNCTION_DECL node, or else to the BLOCK node
1189 we just constructed.
1191 Note that for tagged types whose scope is just the formal parameter
1192 list for some function type specification, we can't properly set
1193 their TYPE_CONTEXTs here, because we don't have a pointer to the
1194 appropriate FUNCTION_TYPE node readily available to us. For those
1195 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1196 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1197 node which will represent the "scope" for these "parameter list local"
1202 for (link = tags; link; link = TREE_CHAIN (link))
1203 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1205 for (link = tags; link; link = TREE_CHAIN (link))
1206 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1209 TREE_USED (block) = 1;
1213 /* Delete the node BLOCK from the current binding level.
1214 This is used for the block inside a stmt expr ({...})
1215 so that the block can be reinserted where appropriate. */
1218 delete_block (block)
1222 if (current_binding_level->blocks == block)
1223 current_binding_level->blocks = TREE_CHAIN (block);
1224 for (t = current_binding_level->blocks; t;)
1226 if (TREE_CHAIN (t) == block)
1227 TREE_CHAIN (t) = TREE_CHAIN (block);
1231 TREE_CHAIN (block) = NULL;
1232 /* Clear TREE_USED which is always set by poplevel.
1233 The flag is set again if insert_block is called. */
1234 TREE_USED (block) = 0;
1237 /* Insert BLOCK at the end of the list of subblocks of the
1238 current binding level. This is used when a BIND_EXPR is expanded,
1239 to handle the BLOCK node inside the BIND_EXPR. */
1242 insert_block (block)
1245 TREE_USED (block) = 1;
1246 current_binding_level->blocks
1247 = chainon (current_binding_level->blocks, block);
1250 /* Set the BLOCK node for the innermost scope
1251 (the one we are currently in). */
1255 register tree block;
1257 current_binding_level->this_block = block;
1263 register struct binding_level *newlevel;
1265 /* Reuse or create a struct for this binding level. */
1267 if (free_binding_level)
1269 newlevel = free_binding_level;
1270 free_binding_level = free_binding_level->level_chain;
1274 newlevel = make_binding_level ();
1277 /* Add this level to the front of the chain (stack) of label levels. */
1279 newlevel->level_chain = label_level_chain;
1280 label_level_chain = newlevel;
1282 newlevel->names = named_labels;
1283 newlevel->shadowed = shadowed_labels;
1285 shadowed_labels = 0;
1291 register struct binding_level *level = label_level_chain;
1294 /* Clear out the definitions of the declared labels in this level.
1295 Leave in the list any ordinary, non-declared labels. */
1296 for (link = named_labels, prev = 0; link;)
1298 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1300 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1302 error_with_decl (TREE_VALUE (link),
1303 "label `%s' used but not defined");
1304 /* Avoid crashing later. */
1305 define_label (input_filename, lineno,
1306 DECL_NAME (TREE_VALUE (link)));
1308 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1309 warning_with_decl (TREE_VALUE (link),
1310 "label `%s' defined but not used");
1311 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1313 /* Delete this element from the list. */
1314 link = TREE_CHAIN (link);
1316 TREE_CHAIN (prev) = link;
1318 named_labels = link;
1323 link = TREE_CHAIN (link);
1327 /* Bring back all the labels that were shadowed. */
1328 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1329 if (DECL_NAME (TREE_VALUE (link)) != 0)
1330 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1331 = TREE_VALUE (link);
1333 named_labels = chainon (named_labels, level->names);
1334 shadowed_labels = level->shadowed;
1336 /* Pop the current level, and free the structure for reuse. */
1337 label_level_chain = label_level_chain->level_chain;
1338 level->level_chain = free_binding_level;
1339 free_binding_level = level;
1342 /* Push a definition or a declaration of struct, union or enum tag "name".
1343 "type" should be the type node.
1344 We assume that the tag "name" is not already defined.
1346 Note that the definition may really be just a forward reference.
1347 In that case, the TYPE_SIZE will be zero. */
1350 pushtag (name, type)
1353 register struct binding_level *b;
1355 /* Find the proper binding level for this type tag. */
1357 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1362 /* Record the identifier as the type's name if it has none. */
1364 if (TYPE_NAME (type) == 0)
1365 TYPE_NAME (type) = name;
1368 b->tags = tree_cons (name, type, b->tags);
1370 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1371 tagged type we just added to the current binding level. This fake
1372 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1373 to output a representation of a tagged type, and it also gives
1374 us a convenient place to record the "scope start" address for the
1377 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1379 /* An approximation for now, so we can tell this is a function-scope tag.
1380 This will be updated in poplevel. */
1381 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1384 /* Handle when a new declaration NEWDECL
1385 has the same name as an old one OLDDECL
1386 in the same binding contour.
1387 Prints an error message if appropriate.
1389 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1390 Otherwise, return 0.
1392 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1393 and OLDDECL is in an outer binding level and should thus not be changed. */
1396 duplicate_decls (newdecl, olddecl, different_binding_level)
1397 register tree newdecl, olddecl;
1398 int different_binding_level;
1400 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1401 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1402 && DECL_INITIAL (newdecl) != 0);
1403 tree oldtype = TREE_TYPE (olddecl);
1404 tree newtype = TREE_TYPE (newdecl);
1407 if (DECL_P (olddecl))
1408 DECL_MACHINE_ATTRIBUTES (newdecl)
1409 = merge_machine_decl_attributes (olddecl, newdecl);
1411 if (TREE_CODE (newtype) == ERROR_MARK
1412 || TREE_CODE (oldtype) == ERROR_MARK)
1415 /* New decl is completely inconsistent with the old one =>
1416 tell caller to replace the old one.
1417 This is always an error except in the case of shadowing a builtin. */
1418 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1420 if (TREE_CODE (olddecl) == FUNCTION_DECL
1421 && (DECL_BUILT_IN (olddecl)
1422 || DECL_BUILT_IN_NONANSI (olddecl)))
1424 /* If you declare a built-in or predefined function name as static,
1425 the old definition is overridden,
1426 but optionally warn this was a bad choice of name. */
1427 if (!TREE_PUBLIC (newdecl))
1431 else if (DECL_BUILT_IN (olddecl))
1432 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1434 warning_with_decl (newdecl, "shadowing library function `%s'");
1436 /* Likewise, if the built-in is not ansi, then programs can
1437 override it even globally without an error. */
1438 else if (! DECL_BUILT_IN (olddecl))
1439 warning_with_decl (newdecl,
1440 "library function `%s' declared as non-function");
1442 else if (DECL_BUILT_IN_NONANSI (olddecl))
1443 warning_with_decl (newdecl,
1444 "built-in function `%s' declared as non-function");
1446 warning_with_decl (newdecl,
1447 "built-in function `%s' declared as non-function");
1451 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1452 error_with_decl (olddecl, "previous declaration of `%s'");
1458 /* For real parm decl following a forward decl,
1459 return 1 so old decl will be reused. */
1460 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1461 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1464 /* The new declaration is the same kind of object as the old one.
1465 The declarations may partially match. Print warnings if they don't
1466 match enough. Ultimately, copy most of the information from the new
1467 decl to the old one, and keep using the old one. */
1469 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1470 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1471 && DECL_INITIAL (olddecl) == 0)
1472 /* If -traditional, avoid error for redeclaring fcn
1473 after implicit decl. */
1475 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1476 && DECL_BUILT_IN (olddecl))
1478 /* A function declaration for a built-in function. */
1479 if (!TREE_PUBLIC (newdecl))
1481 /* If you declare a built-in function name as static, the
1482 built-in definition is overridden,
1483 but optionally warn this was a bad choice of name. */
1485 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1486 /* Discard the old built-in function. */
1489 else if (!types_match)
1491 /* Accept the return type of the new declaration if same modes. */
1492 tree oldreturntype = TREE_TYPE (oldtype);
1493 tree newreturntype = TREE_TYPE (newtype);
1495 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1497 /* Function types may be shared, so we can't just modify
1498 the return type of olddecl's function type. */
1500 = build_function_type (newreturntype,
1501 TYPE_ARG_TYPES (oldtype));
1503 types_match = comptypes (newtype, trytype);
1507 /* Accept harmless mismatch in first argument type also.
1509 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1510 && TYPE_ARG_TYPES (oldtype) != 0
1511 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1512 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1513 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1514 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1516 /* Function types may be shared, so we can't just modify
1517 the return type of olddecl's function type. */
1519 = build_function_type (TREE_TYPE (oldtype),
1520 tree_cons (NULL_TREE,
1521 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1522 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1524 types_match = comptypes (newtype, trytype);
1528 if (! different_binding_level)
1529 TREE_TYPE (olddecl) = oldtype;
1533 /* If types don't match for a built-in, throw away the built-in. */
1534 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1538 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1539 && DECL_SOURCE_LINE (olddecl) == 0)
1541 /* A function declaration for a predeclared function
1542 that isn't actually built in. */
1543 if (!TREE_PUBLIC (newdecl))
1545 /* If you declare it as static, the
1546 default definition is overridden. */
1549 else if (!types_match)
1551 /* If the types don't match, preserve volatility indication.
1552 Later on, we will discard everything else about the
1553 default declaration. */
1554 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1557 /* Permit char *foo () to match void *foo (...) if not pedantic,
1558 if one of them came from a system header file. */
1559 else if (!types_match
1560 && TREE_CODE (olddecl) == FUNCTION_DECL
1561 && TREE_CODE (newdecl) == FUNCTION_DECL
1562 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1563 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1564 && (DECL_IN_SYSTEM_HEADER (olddecl)
1565 || DECL_IN_SYSTEM_HEADER (newdecl))
1566 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1567 && TYPE_ARG_TYPES (oldtype) == 0
1568 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1569 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1571 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1572 && TYPE_ARG_TYPES (newtype) == 0
1573 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1574 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1577 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1578 /* Make sure we keep void * as ret type, not char *. */
1579 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1580 TREE_TYPE (newdecl) = newtype = oldtype;
1582 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1583 we will come back here again. */
1584 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1586 else if (!types_match
1587 /* Permit char *foo (int, ...); followed by char *foo ();
1589 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1591 /* Return types must still match. */
1592 && comptypes (TREE_TYPE (oldtype),
1593 TREE_TYPE (newtype))
1594 && TYPE_ARG_TYPES (newtype) == 0))
1596 error_with_decl (newdecl, "conflicting types for `%s'");
1597 /* Check for function type mismatch
1598 involving an empty arglist vs a nonempty one. */
1599 if (TREE_CODE (olddecl) == FUNCTION_DECL
1600 && comptypes (TREE_TYPE (oldtype),
1601 TREE_TYPE (newtype))
1602 && ((TYPE_ARG_TYPES (oldtype) == 0
1603 && DECL_INITIAL (olddecl) == 0)
1605 (TYPE_ARG_TYPES (newtype) == 0
1606 && DECL_INITIAL (newdecl) == 0)))
1608 /* Classify the problem further. */
1609 register tree t = TYPE_ARG_TYPES (oldtype);
1611 t = TYPE_ARG_TYPES (newtype);
1612 for (; t; t = TREE_CHAIN (t))
1614 register tree type = TREE_VALUE (t);
1616 if (TREE_CHAIN (t) == 0
1617 && TYPE_MAIN_VARIANT (type) != void_type_node)
1619 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1623 if (simple_type_promotes_to (type) != NULL_TREE)
1625 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1630 error_with_decl (olddecl, "previous declaration of `%s'");
1634 errmsg = redeclaration_error_message (newdecl, olddecl);
1640 error_with_decl (newdecl, "redefinition of `%s'");
1643 error_with_decl (newdecl, "redeclaration of `%s'");
1646 error_with_decl (newdecl, "conflicting declarations of `%s'");
1652 error_with_decl (olddecl,
1653 ((DECL_INITIAL (olddecl)
1654 && current_binding_level == global_binding_level)
1655 ? "`%s' previously defined here"
1656 : "`%s' previously declared here"));
1658 else if (TREE_CODE (newdecl) == TYPE_DECL
1659 && (DECL_IN_SYSTEM_HEADER (olddecl)
1660 || DECL_IN_SYSTEM_HEADER (newdecl)))
1662 warning_with_decl (newdecl, "redefinition of `%s'");
1665 ((DECL_INITIAL (olddecl)
1666 && current_binding_level == global_binding_level)
1667 ? "`%s' previously defined here"
1668 : "`%s' previously declared here"));
1670 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1671 && DECL_INITIAL (olddecl) != 0
1672 && TYPE_ARG_TYPES (oldtype) == 0
1673 && TYPE_ARG_TYPES (newtype) != 0
1674 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1676 register tree type, parm;
1678 /* Prototype decl follows defn w/o prototype. */
1680 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1681 type = TYPE_ARG_TYPES (newtype),
1684 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1686 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1687 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1689 warning_with_decl (newdecl, "prototype for `%s' follows");
1690 warning_with_decl (olddecl, "non-prototype definition here");
1693 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1694 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1696 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1697 error_with_decl (olddecl, "non-prototype definition here");
1701 /* Type for passing arg must be consistent
1702 with that declared for the arg. */
1703 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1704 /* If -traditional, allow `unsigned int' instead of `int'
1705 in the prototype. */
1706 && (! (flag_traditional
1707 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1708 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1710 error_with_decl (newdecl,
1711 "prototype for `%s' follows and argument %d doesn't match",
1713 error_with_decl (olddecl, "non-prototype definition here");
1719 /* Warn about mismatches in various flags. */
1722 /* Warn if function is now inline
1723 but was previously declared not inline and has been called. */
1724 if (TREE_CODE (olddecl) == FUNCTION_DECL
1725 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1726 && TREE_USED (olddecl))
1727 warning_with_decl (newdecl,
1728 "`%s' declared inline after being called");
1729 if (TREE_CODE (olddecl) == FUNCTION_DECL
1730 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1731 && DECL_INITIAL (olddecl) != 0)
1732 warning_with_decl (newdecl,
1733 "`%s' declared inline after its definition");
1735 /* If pedantic, warn when static declaration follows a non-static
1736 declaration. Otherwise, do so only for functions. */
1737 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1738 && TREE_PUBLIC (olddecl)
1739 && !TREE_PUBLIC (newdecl))
1740 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1742 /* If warn_traditional, warn when a non-static function
1743 declaration follows a static one. */
1744 if (warn_traditional
1745 && TREE_CODE (olddecl) == FUNCTION_DECL
1746 && !TREE_PUBLIC (olddecl)
1747 && TREE_PUBLIC (newdecl))
1748 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1750 /* Warn when const declaration follows a non-const
1751 declaration, but not for functions. */
1752 if (TREE_CODE (olddecl) != FUNCTION_DECL
1753 && !TREE_READONLY (olddecl)
1754 && TREE_READONLY (newdecl))
1755 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1756 /* These bits are logically part of the type, for variables.
1757 But not for functions
1758 (where qualifiers are not valid ANSI anyway). */
1759 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1760 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1761 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1762 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1766 /* Optionally warn about more than one declaration for the same name. */
1767 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1768 /* Don't warn about a function declaration
1769 followed by a definition. */
1770 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1771 && DECL_INITIAL (olddecl) == 0)
1772 /* Don't warn about extern decl followed by (tentative) definition. */
1773 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1775 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1776 warning_with_decl (olddecl, "previous declaration of `%s'");
1779 /* Copy all the DECL_... slots specified in the new decl
1780 except for any that we copy here from the old type.
1782 Past this point, we don't change OLDTYPE and NEWTYPE
1783 even if we change the types of NEWDECL and OLDDECL. */
1787 /* When copying info to olddecl, we store into write_olddecl
1788 instead. This allows us to avoid modifying olddecl when
1789 different_binding_level is true. */
1790 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1792 /* Merge the data types specified in the two decls. */
1793 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1795 if (different_binding_level)
1797 = build_type_attribute_variant
1799 merge_attributes (TYPE_ATTRIBUTES (newtype),
1800 TYPE_ATTRIBUTES (oldtype)));
1803 = TREE_TYPE (olddecl)
1804 = common_type (newtype, oldtype);
1807 /* Lay the type out, unless already done. */
1808 if (oldtype != TREE_TYPE (newdecl))
1810 if (TREE_TYPE (newdecl) != error_mark_node)
1811 layout_type (TREE_TYPE (newdecl));
1812 if (TREE_CODE (newdecl) != FUNCTION_DECL
1813 && TREE_CODE (newdecl) != TYPE_DECL
1814 && TREE_CODE (newdecl) != CONST_DECL)
1815 layout_decl (newdecl, 0);
1819 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1820 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1821 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1822 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1823 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1824 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1826 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1827 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1831 /* Keep the old rtl since we can safely use it. */
1832 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1834 /* Merge the type qualifiers. */
1835 if (TREE_CODE (olddecl) == FUNCTION_DECL
1836 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1837 && ! TREE_THIS_VOLATILE (newdecl))
1838 TREE_THIS_VOLATILE (write_olddecl) = 0;
1840 if (TREE_READONLY (newdecl))
1841 TREE_READONLY (write_olddecl) = 1;
1843 if (TREE_THIS_VOLATILE (newdecl))
1845 TREE_THIS_VOLATILE (write_olddecl) = 1;
1846 if (TREE_CODE (newdecl) == VAR_DECL
1847 /* If an automatic variable is re-declared in the same
1848 function scope, but the old declaration was not
1849 volatile, make_var_volatile() would crash because the
1850 variable would have been assigned to a pseudo, not a
1851 MEM. Since this duplicate declaration is invalid
1852 anyway, we just skip the call. */
1854 make_var_volatile (newdecl);
1857 /* Keep source location of definition rather than declaration. */
1858 /* When called with different_binding_level set, keep the old
1859 information so that meaningful diagnostics can be given. */
1860 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1861 && ! different_binding_level)
1863 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1864 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1867 /* Merge the unused-warning information. */
1868 if (DECL_IN_SYSTEM_HEADER (olddecl))
1869 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1870 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1871 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1873 /* Merge the initialization information. */
1874 /* When called with different_binding_level set, don't copy over
1875 DECL_INITIAL, so that we don't accidentally change function
1876 declarations into function definitions. */
1877 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1878 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1880 /* Merge the section attribute.
1881 We want to issue an error if the sections conflict but that must be
1882 done later in decl_attributes since we are called before attributes
1884 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1885 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1887 /* Copy the assembler name.
1888 Currently, it can only be defined in the prototype. */
1889 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1891 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1893 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1894 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1896 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1897 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1898 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1899 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1900 DECL_NO_LIMIT_STACK (newdecl)
1901 |= DECL_NO_LIMIT_STACK (olddecl);
1904 /* If cannot merge, then use the new type and qualifiers,
1905 and don't preserve the old rtl. */
1906 else if (! different_binding_level)
1908 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1909 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1910 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1911 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1914 /* Merge the storage class information. */
1915 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1916 /* For functions, static overrides non-static. */
1917 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1919 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1920 /* This is since we don't automatically
1921 copy the attributes of NEWDECL into OLDDECL. */
1922 /* No need to worry about different_binding_level here because
1923 then TREE_PUBLIC (newdecl) was true. */
1924 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1925 /* If this clears `static', clear it in the identifier too. */
1926 if (! TREE_PUBLIC (olddecl))
1927 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1929 if (DECL_EXTERNAL (newdecl))
1931 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1932 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1933 /* An extern decl does not override previous storage class. */
1934 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1935 if (! DECL_EXTERNAL (newdecl))
1936 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1940 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1941 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1944 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1946 /* If either decl says `inline', this fn is inline,
1947 unless its definition was passed already. */
1948 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1949 DECL_INLINE (olddecl) = 1;
1951 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1953 if (DECL_BUILT_IN (olddecl))
1955 /* Get rid of any built-in function if new arg types don't match it
1956 or if we have a function definition. */
1957 if (! types_match || new_is_definition)
1959 if (! different_binding_level)
1961 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1962 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1967 /* If redeclaring a builtin function, and not a definition,
1968 it stays built in. */
1969 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1970 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1973 /* Also preserve various other info from the definition. */
1974 else if (! new_is_definition)
1975 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1976 if (! new_is_definition)
1978 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1979 /* When called with different_binding_level set, don't copy over
1980 DECL_INITIAL, so that we don't accidentally change function
1981 declarations into function definitions. */
1982 if (! different_binding_level)
1983 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1984 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1985 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1986 if (DECL_INLINE (newdecl))
1987 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
1990 if (different_binding_level)
1992 /* Don't output a duplicate symbol or debugging information for this
1995 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1996 just have two declarations without a definition. VAR_DECLs may need
1997 the same treatment, I'm not sure. */
1998 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1999 DECL_IGNORED_P (newdecl) = 1;
2001 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2005 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2006 But preserve OLDDECL's DECL_UID. */
2008 register unsigned olddecl_uid = DECL_UID (olddecl);
2010 bcopy ((char *) newdecl + sizeof (struct tree_common),
2011 (char *) olddecl + sizeof (struct tree_common),
2012 sizeof (struct tree_decl) - sizeof (struct tree_common));
2013 DECL_UID (olddecl) = olddecl_uid;
2016 /* NEWDECL contains the merged attribute lists.
2017 Update OLDDECL to be the same. */
2018 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2023 /* Record a decl-node X as belonging to the current lexical scope.
2024 Check for errors (such as an incompatible declaration for the same
2025 name already seen in the same scope).
2027 Returns either X or an old decl for the same name.
2028 If an old decl is returned, it may have been smashed
2029 to agree with what X says. */
2036 register tree name = DECL_NAME (x);
2037 register struct binding_level *b = current_binding_level;
2039 DECL_CONTEXT (x) = current_function_decl;
2040 /* A local extern declaration for a function doesn't constitute nesting.
2041 A local auto declaration does, since it's a forward decl
2042 for a nested function coming later. */
2043 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2044 && DECL_EXTERNAL (x))
2045 DECL_CONTEXT (x) = 0;
2047 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2048 && x != IDENTIFIER_IMPLICIT_DECL (name)
2049 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2050 && !DECL_IN_SYSTEM_HEADER (x))
2051 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2057 int different_binding_level = 0;
2059 t = lookup_name_current_level (name);
2060 /* Don't type check externs here when -traditional. This is so that
2061 code with conflicting declarations inside blocks will get warnings
2062 not errors. X11 for instance depends on this. */
2063 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2065 t = IDENTIFIER_GLOBAL_VALUE (name);
2066 /* Type decls at global scope don't conflict with externs declared
2067 inside lexical blocks. */
2068 if (t && TREE_CODE (t) == TYPE_DECL)
2070 different_binding_level = 1;
2072 if (t != 0 && t == error_mark_node)
2073 /* error_mark_node is 0 for a while during initialization! */
2076 error_with_decl (x, "`%s' used prior to declaration");
2081 file = DECL_SOURCE_FILE (t);
2082 line = DECL_SOURCE_LINE (t);
2085 /* If this decl is `static' and an implicit decl was seen previously,
2086 warn. But don't complain if -traditional,
2087 since traditional compilers don't complain. */
2088 if (! flag_traditional && TREE_PUBLIC (name)
2089 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2090 sets this for all functions. */
2091 && ! TREE_PUBLIC (x)
2092 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2093 /* We used to warn also for explicit extern followed by static,
2094 but sometimes you need to do it that way. */
2095 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2097 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2098 IDENTIFIER_POINTER (name));
2099 pedwarn_with_file_and_line
2100 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2101 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2102 "previous declaration of `%s'",
2103 IDENTIFIER_POINTER (name));
2104 TREE_THIS_VOLATILE (name) = 1;
2107 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2109 if (TREE_CODE (t) == PARM_DECL)
2111 /* Don't allow more than one "real" duplicate
2112 of a forward parm decl. */
2113 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2119 /* If we are processing a typedef statement, generate a whole new
2120 ..._TYPE node (which will be just an variant of the existing
2121 ..._TYPE node with identical properties) and then install the
2122 TYPE_DECL node generated to represent the typedef name as the
2123 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2125 The whole point here is to end up with a situation where each
2126 and every ..._TYPE node the compiler creates will be uniquely
2127 associated with AT MOST one node representing a typedef name.
2128 This way, even though the compiler substitutes corresponding
2129 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2130 early on, later parts of the compiler can always do the reverse
2131 translation and get back the corresponding typedef name. For
2134 typedef struct S MY_TYPE;
2137 Later parts of the compiler might only know that `object' was of
2138 type `struct S' if it were not for code just below. With this
2139 code however, later parts of the compiler see something like:
2141 struct S' == struct S
2142 typedef struct S' MY_TYPE;
2145 And they can then deduce (from the node for type struct S') that
2146 the original object declaration was:
2150 Being able to do this is important for proper support of protoize,
2151 and also for generating precise symbolic debugging information
2152 which takes full account of the programmer's (typedef) vocabulary.
2154 Obviously, we don't want to generate a duplicate ..._TYPE node if
2155 the TYPE_DECL node that we are now processing really represents a
2156 standard built-in type.
2158 Since all standard types are effectively declared at line zero
2159 in the source file, we can easily check to see if we are working
2160 on a standard type by checking the current value of lineno. */
2162 if (TREE_CODE (x) == TYPE_DECL)
2164 if (DECL_SOURCE_LINE (x) == 0)
2166 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2167 TYPE_NAME (TREE_TYPE (x)) = x;
2169 else if (TREE_TYPE (x) != error_mark_node
2170 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2172 tree tt = TREE_TYPE (x);
2173 DECL_ORIGINAL_TYPE (x) = tt;
2174 tt = build_type_copy (tt);
2176 TREE_USED (tt) = TREE_USED (x);
2181 /* Multiple external decls of the same identifier ought to match.
2182 Check against both global declarations (when traditional) and out of
2183 scope (limbo) block level declarations.
2185 We get warnings about inline functions where they are defined.
2186 Avoid duplicate warnings where they are used. */
2188 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2192 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2193 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2194 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2195 decl = IDENTIFIER_GLOBAL_VALUE (name);
2196 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2197 /* Decls in limbo are always extern, so no need to check that. */
2198 decl = IDENTIFIER_LIMBO_VALUE (name);
2202 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2203 /* If old decl is built-in, we already warned if we should. */
2204 && !DECL_BUILT_IN (decl))
2206 pedwarn_with_decl (x,
2207 "type mismatch with previous external decl");
2208 pedwarn_with_decl (decl, "previous external decl of `%s'");
2212 /* If a function has had an implicit declaration, and then is defined,
2213 make sure they are compatible. */
2215 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2216 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2217 && TREE_CODE (x) == FUNCTION_DECL
2218 && ! comptypes (TREE_TYPE (x),
2219 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2221 warning_with_decl (x, "type mismatch with previous implicit declaration");
2222 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2223 "previous implicit declaration of `%s'");
2226 /* In PCC-compatibility mode, extern decls of vars with no current decl
2227 take effect at top level no matter where they are. */
2228 if (flag_traditional && DECL_EXTERNAL (x)
2229 && lookup_name (name) == 0)
2231 tree type = TREE_TYPE (x);
2233 /* But don't do this if the type contains temporary nodes. */
2236 if (type == error_mark_node)
2238 if (TYPE_CONTEXT (type))
2240 warning_with_decl (x, "type of external `%s' is not global");
2241 /* By exiting the loop early, we leave TYPE nonzero,
2242 and thus prevent globalization of the decl. */
2245 else if (TREE_CODE (type) == FUNCTION_TYPE
2246 && TYPE_ARG_TYPES (type) != 0)
2247 /* The types might not be truly local,
2248 but the list of arg types certainly is temporary.
2249 Since prototypes are nontraditional,
2250 ok not to do the traditional thing. */
2252 type = TREE_TYPE (type);
2256 b = global_binding_level;
2259 /* This name is new in its binding level.
2260 Install the new declaration and return it. */
2261 if (b == global_binding_level)
2263 /* Install a global value. */
2265 /* If the first global decl has external linkage,
2266 warn if we later see static one. */
2267 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2268 TREE_PUBLIC (name) = 1;
2270 IDENTIFIER_GLOBAL_VALUE (name) = x;
2272 /* We no longer care about any previous block level declarations. */
2273 IDENTIFIER_LIMBO_VALUE (name) = 0;
2275 /* Don't forget if the function was used via an implicit decl. */
2276 if (IDENTIFIER_IMPLICIT_DECL (name)
2277 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2278 TREE_USED (x) = 1, TREE_USED (name) = 1;
2280 /* Don't forget if its address was taken in that way. */
2281 if (IDENTIFIER_IMPLICIT_DECL (name)
2282 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2283 TREE_ADDRESSABLE (x) = 1;
2285 /* Warn about mismatches against previous implicit decl. */
2286 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2287 /* If this real decl matches the implicit, don't complain. */
2288 && ! (TREE_CODE (x) == FUNCTION_DECL
2289 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2290 == integer_type_node)))
2291 pedwarn ("`%s' was previously implicitly declared to return `int'",
2292 IDENTIFIER_POINTER (name));
2294 /* If this decl is `static' and an `extern' was seen previously,
2295 that is erroneous. */
2296 if (TREE_PUBLIC (name)
2297 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2299 /* Okay to redeclare an ANSI built-in as static. */
2300 if (t != 0 && DECL_BUILT_IN (t))
2302 /* Okay to declare a non-ANSI built-in as anything. */
2303 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2305 /* Okay to have global type decl after an earlier extern
2306 declaration inside a lexical block. */
2307 else if (TREE_CODE (x) == TYPE_DECL)
2309 else if (IDENTIFIER_IMPLICIT_DECL (name))
2311 if (! TREE_THIS_VOLATILE (name))
2312 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2313 IDENTIFIER_POINTER (name));
2316 pedwarn ("`%s' was declared `extern' and later `static'",
2317 IDENTIFIER_POINTER (name));
2322 /* Here to install a non-global value. */
2323 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2324 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2326 IDENTIFIER_LOCAL_VALUE (name) = x;
2328 /* If this is an extern function declaration, see if we
2329 have a global definition or declaration for the function. */
2332 && TREE_CODE (x) == FUNCTION_DECL
2333 && TREE_CODE (oldglobal) == FUNCTION_DECL
2334 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2336 /* We have one. Their types must agree. */
2337 if (! comptypes (TREE_TYPE (x),
2338 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2339 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2342 /* Inner extern decl is inline if global one is.
2343 Copy enough to really inline it. */
2344 if (DECL_INLINE (oldglobal))
2346 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2347 DECL_INITIAL (x) = (current_function_decl == oldglobal
2348 ? 0 : DECL_INITIAL (oldglobal));
2349 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2350 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2351 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2352 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2353 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2354 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2356 /* Inner extern decl is built-in if global one is. */
2357 if (DECL_BUILT_IN (oldglobal))
2359 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2360 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2362 /* Keep the arg types from a file-scope fcn defn. */
2363 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2364 && DECL_INITIAL (oldglobal)
2365 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2366 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2370 #if 0 /* This case is probably sometimes the right thing to do. */
2371 /* If we have a local external declaration,
2372 then any file-scope declaration should not
2373 have been static. */
2374 if (oldlocal == 0 && oldglobal != 0
2375 && !TREE_PUBLIC (oldglobal)
2376 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2377 warning ("`%s' locally external but globally static",
2378 IDENTIFIER_POINTER (name));
2381 /* If we have a local external declaration,
2382 and no file-scope declaration has yet been seen,
2383 then if we later have a file-scope decl it must not be static. */
2385 && DECL_EXTERNAL (x)
2389 TREE_PUBLIC (name) = 1;
2391 /* Save this decl, so that we can do type checking against
2392 other decls after it falls out of scope.
2394 Only save it once. This prevents temporary decls created in
2395 expand_inline_function from being used here, since this
2396 will have been set when the inline function was parsed.
2397 It also helps give slightly better warnings. */
2398 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2399 IDENTIFIER_LIMBO_VALUE (name) = x;
2402 /* Warn if shadowing an argument at the top level of the body. */
2403 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2404 /* This warning doesn't apply to the parms of a nested fcn. */
2405 && ! current_binding_level->parm_flag
2406 /* Check that this is one level down from the parms. */
2407 && current_binding_level->level_chain->parm_flag
2408 /* Check that the decl being shadowed
2409 comes from the parm level, one level up. */
2410 && chain_member (oldlocal, current_binding_level->level_chain->names))
2412 if (TREE_CODE (oldlocal) == PARM_DECL)
2413 pedwarn ("declaration of `%s' shadows a parameter",
2414 IDENTIFIER_POINTER (name));
2416 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2417 IDENTIFIER_POINTER (name));
2420 /* Maybe warn if shadowing something else. */
2421 else if (warn_shadow && !DECL_EXTERNAL (x)
2422 /* No shadow warnings for internally generated vars. */
2423 && DECL_SOURCE_LINE (x) != 0
2424 /* No shadow warnings for vars made for inlining. */
2425 && ! DECL_FROM_INLINE (x))
2427 char *id = IDENTIFIER_POINTER (name);
2429 if (TREE_CODE (x) == PARM_DECL
2430 && current_binding_level->level_chain->parm_flag)
2431 /* Don't warn about the parm names in function declarator
2432 within a function declarator.
2433 It would be nice to avoid warning in any function
2434 declarator in a declaration, as opposed to a definition,
2435 but there is no way to tell it's not a definition. */
2437 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2438 warning ("declaration of `%s' shadows a parameter", id);
2439 else if (oldlocal != 0)
2440 warning ("declaration of `%s' shadows previous local", id);
2441 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2442 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2443 warning ("declaration of `%s' shadows global declaration", id);
2446 /* If storing a local value, there may already be one (inherited).
2447 If so, record it for restoration when this binding level ends. */
2449 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2452 /* Keep count of variables in this level with incomplete type.
2453 If the input is erroneous, we can have error_mark in the type
2454 slot (e.g. "f(void a, ...)") - that doesn't count as an
2456 if (TREE_TYPE (x) != error_mark_node
2457 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2461 /* Put decls on list in reverse order.
2462 We will reverse them later if necessary. */
2463 TREE_CHAIN (x) = b->names;
2469 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2472 pushdecl_top_level (x)
2476 register struct binding_level *b = current_binding_level;
2478 current_binding_level = global_binding_level;
2480 current_binding_level = b;
2484 /* Generate an implicit declaration for identifier FUNCTIONID
2485 as a function of type int (). Print a warning if appropriate. */
2488 implicitly_declare (functionid)
2492 int traditional_warning = 0;
2493 /* Only one "implicit declaration" warning per identifier. */
2494 int implicit_warning;
2496 /* We used to reuse an old implicit decl here,
2497 but this loses with inline functions because it can clobber
2498 the saved decl chains. */
2499 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2500 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2502 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2504 /* Warn of implicit decl following explicit local extern decl.
2505 This is probably a program designed for traditional C. */
2506 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2507 traditional_warning = 1;
2509 /* Warn once of an implicit declaration. */
2510 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2512 DECL_EXTERNAL (decl) = 1;
2513 TREE_PUBLIC (decl) = 1;
2515 /* Record that we have an implicit decl and this is it. */
2516 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2518 /* ANSI standard says implicit declarations are in the innermost block.
2519 So we record the decl in the standard fashion.
2520 If flag_traditional is set, pushdecl does it top-level. */
2523 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2524 maybe_objc_check_decl (decl);
2526 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2528 if (mesg_implicit_function_declaration && implicit_warning)
2530 if (mesg_implicit_function_declaration == 2)
2531 error ("implicit declaration of function `%s'",
2532 IDENTIFIER_POINTER (functionid));
2534 warning ("implicit declaration of function `%s'",
2535 IDENTIFIER_POINTER (functionid));
2537 else if (warn_traditional && traditional_warning)
2538 warning ("function `%s' was previously declared within a block",
2539 IDENTIFIER_POINTER (functionid));
2541 /* Write a record describing this implicit function declaration to the
2542 prototypes file (if requested). */
2544 gen_aux_info_record (decl, 0, 1, 0);
2549 /* Return zero if the declaration NEWDECL is valid
2550 when the declaration OLDDECL (assumed to be for the same name)
2551 has already been seen.
2552 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2553 and 3 if it is a conflicting declaration. */
2556 redeclaration_error_message (newdecl, olddecl)
2557 tree newdecl, olddecl;
2559 if (TREE_CODE (newdecl) == TYPE_DECL)
2561 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2563 /* pushdecl creates distinct types for TYPE_DECLs by calling
2564 build_type_copy, so the above comparison generally fails. We do
2565 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2566 is equivalent to what this code used to do before the build_type_copy
2567 call. The variant type distinction should not matter for traditional
2568 code, because it doesn't have type qualifiers. */
2569 if (flag_traditional
2570 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2572 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2576 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2578 /* Declarations of functions can insist on internal linkage
2579 but they can't be inconsistent with internal linkage,
2580 so there can be no error on that account.
2581 However defining the same name twice is no good. */
2582 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2583 /* However, defining once as extern inline and a second
2584 time in another way is ok. */
2585 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2586 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2590 else if (current_binding_level == global_binding_level)
2592 /* Objects declared at top level: */
2593 /* If at least one is a reference, it's ok. */
2594 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2596 /* Reject two definitions. */
2597 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2599 /* Now we have two tentative defs, or one tentative and one real def. */
2600 /* Insist that the linkage match. */
2601 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2605 else if (current_binding_level->parm_flag
2606 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2610 /* Newdecl has block scope. If olddecl has block scope also, then
2611 reject two definitions, and reject a definition together with an
2612 external reference. Otherwise, it is OK, because newdecl must
2613 be an extern reference to olddecl. */
2614 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2615 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2621 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2622 Create one if none exists so far for the current function.
2623 This function is called for both label definitions and label references. */
2629 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2631 if (current_function_decl == 0)
2633 error ("label %s referenced outside of any function",
2634 IDENTIFIER_POINTER (id));
2638 /* Use a label already defined or ref'd with this name. */
2641 /* But not if it is inherited and wasn't declared to be inheritable. */
2642 if (DECL_CONTEXT (decl) != current_function_decl
2643 && ! C_DECLARED_LABEL_FLAG (decl))
2644 return shadow_label (id);
2648 decl = build_decl (LABEL_DECL, id, void_type_node);
2650 /* Make sure every label has an rtx. */
2653 /* A label not explicitly declared must be local to where it's ref'd. */
2654 DECL_CONTEXT (decl) = current_function_decl;
2656 DECL_MODE (decl) = VOIDmode;
2658 /* Say where one reference is to the label,
2659 for the sake of the error if it is not defined. */
2660 DECL_SOURCE_LINE (decl) = lineno;
2661 DECL_SOURCE_FILE (decl) = input_filename;
2663 IDENTIFIER_LABEL_VALUE (id) = decl;
2665 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2670 /* Make a label named NAME in the current function,
2671 shadowing silently any that may be inherited from containing functions
2672 or containing scopes.
2674 Note that valid use, if the label being shadowed
2675 comes from another scope in the same function,
2676 requires calling declare_nonlocal_label right away. */
2682 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2688 /* Check to make sure that the label hasn't already been declared
2689 at this label scope */
2690 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2691 if (TREE_VALUE (dup) == decl)
2693 error ("duplicate label declaration `%s'",
2694 IDENTIFIER_POINTER (name));
2695 error_with_decl (TREE_VALUE (dup),
2696 "this is a previous declaration");
2697 /* Just use the previous declaration. */
2698 return lookup_label (name);
2701 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2702 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2705 return lookup_label (name);
2708 /* Define a label, specifying the location in the source file.
2709 Return the LABEL_DECL node for the label, if the definition is valid.
2710 Otherwise return 0. */
2713 define_label (filename, line, name)
2714 const char *filename;
2718 tree decl = lookup_label (name);
2720 /* If label with this name is known from an outer context, shadow it. */
2721 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2723 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2724 IDENTIFIER_LABEL_VALUE (name) = 0;
2725 decl = lookup_label (name);
2728 if (warn_traditional && lookup_name (name))
2729 warning ("traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2730 IDENTIFIER_POINTER (name));
2732 if (DECL_INITIAL (decl) != 0)
2734 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2739 /* Mark label as having been defined. */
2740 DECL_INITIAL (decl) = error_mark_node;
2741 /* Say where in the source. */
2742 DECL_SOURCE_FILE (decl) = filename;
2743 DECL_SOURCE_LINE (decl) = line;
2748 /* Return the list of declarations of the current level.
2749 Note that this list is in reverse order unless/until
2750 you nreverse it; and when you do nreverse it, you must
2751 store the result back using `storedecls' or you will lose. */
2756 return current_binding_level->names;
2759 /* Return the list of type-tags (for structs, etc) of the current level. */
2764 return current_binding_level->tags;
2767 /* Store the list of declarations of the current level.
2768 This is done for the parameter declarations of a function being defined,
2769 after they are modified in the light of any missing parameters. */
2775 current_binding_level->names = decls;
2778 /* Similarly, store the list of tags of the current level. */
2784 current_binding_level->tags = tags;
2787 /* Given NAME, an IDENTIFIER_NODE,
2788 return the structure (or union or enum) definition for that name.
2789 Searches binding levels from BINDING_LEVEL up to the global level.
2790 If THISLEVEL_ONLY is nonzero, searches only the specified context
2791 (but skips any tag-transparent contexts to find one that is
2792 meaningful for tags).
2793 CODE says which kind of type the caller wants;
2794 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2795 If the wrong kind of type is found, an error is reported. */
2798 lookup_tag (code, name, binding_level, thislevel_only)
2799 enum tree_code code;
2800 struct binding_level *binding_level;
2804 register struct binding_level *level;
2806 for (level = binding_level; level; level = level->level_chain)
2809 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2811 if (TREE_PURPOSE (tail) == name)
2813 if (TREE_CODE (TREE_VALUE (tail)) != code)
2815 /* Definition isn't the kind we were looking for. */
2816 pending_invalid_xref = name;
2817 pending_invalid_xref_file = input_filename;
2818 pending_invalid_xref_line = lineno;
2820 return TREE_VALUE (tail);
2823 if (thislevel_only && ! level->tag_transparent)
2829 /* Print an error message now
2830 for a recent invalid struct, union or enum cross reference.
2831 We don't print them immediately because they are not invalid
2832 when used in the `struct foo;' construct for shadowing. */
2835 pending_xref_error ()
2837 if (pending_invalid_xref != 0)
2838 error_with_file_and_line (pending_invalid_xref_file,
2839 pending_invalid_xref_line,
2840 "`%s' defined as wrong kind of tag",
2841 IDENTIFIER_POINTER (pending_invalid_xref));
2842 pending_invalid_xref = 0;
2845 /* Given a type, find the tag that was defined for it and return the tag name.
2846 Otherwise return 0. */
2849 lookup_tag_reverse (type)
2852 register struct binding_level *level;
2854 for (level = current_binding_level; level; level = level->level_chain)
2857 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2859 if (TREE_VALUE (tail) == type)
2860 return TREE_PURPOSE (tail);
2866 /* Look up NAME in the current binding level and its superiors
2867 in the namespace of variables, functions and typedefs.
2868 Return a ..._DECL node of some kind representing its definition,
2869 or return 0 if it is undefined. */
2876 if (current_binding_level != global_binding_level
2877 && IDENTIFIER_LOCAL_VALUE (name))
2878 val = IDENTIFIER_LOCAL_VALUE (name);
2880 val = IDENTIFIER_GLOBAL_VALUE (name);
2884 /* Similar to `lookup_name' but look only at current binding level. */
2887 lookup_name_current_level (name)
2892 if (current_binding_level == global_binding_level)
2893 return IDENTIFIER_GLOBAL_VALUE (name);
2895 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2898 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2899 if (DECL_NAME (t) == name)
2905 /* Mark ARG for GC. */
2908 mark_binding_level (arg)
2911 struct binding_level *level = *(struct binding_level **) arg;
2913 for (; level != 0; level = level->level_chain)
2915 ggc_mark_tree (level->names);
2916 ggc_mark_tree (level->tags);
2917 ggc_mark_tree (level->shadowed);
2918 ggc_mark_tree (level->blocks);
2919 ggc_mark_tree (level->this_block);
2920 ggc_mark_tree (level->parm_order);
2924 /* Create the predefined scalar types of C,
2925 and some nodes representing standard constants (0, 1, (void *) 0).
2926 Initialize the global binding level.
2927 Make definitions for built-in primitive functions. */
2930 init_decl_processing ()
2932 register tree endlink;
2933 tree ptr_ftype_void, ptr_ftype_ptr;
2934 int wchar_type_size;
2935 tree array_domain_type;
2938 current_function_decl = NULL;
2939 named_labels = NULL;
2940 current_binding_level = NULL_BINDING_LEVEL;
2941 free_binding_level = NULL_BINDING_LEVEL;
2942 pushlevel (0); /* make the binding_level structure for global names */
2943 global_binding_level = current_binding_level;
2945 build_common_tree_nodes (flag_signed_char);
2947 /* Define `int' and `char' first so that dbx will output them first. */
2948 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2949 integer_type_node));
2950 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2952 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2953 long_integer_type_node));
2954 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2955 unsigned_type_node));
2956 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2957 long_unsigned_type_node));
2958 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2959 long_long_integer_type_node));
2960 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2961 long_long_unsigned_type_node));
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2963 short_integer_type_node));
2964 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2965 short_unsigned_type_node));
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2967 signed_char_type_node));
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2969 unsigned_char_type_node));
2970 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2971 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2972 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2973 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2974 #if HOST_BITS_PER_WIDE_INT >= 64
2975 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2977 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2978 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2979 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2980 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2981 #if HOST_BITS_PER_WIDE_INT >= 64
2982 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2985 /* `unsigned long' is the standard type for sizeof.
2986 Traditionally, use a signed type.
2987 Note that stddef.h uses `unsigned long',
2988 and this must agree, even if long and int are the same size. */
2989 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2990 if (flag_traditional && TREE_UNSIGNED (t))
2991 t = signed_type (t);
2995 /* Create the widest literal types. */
2996 widest_integer_literal_type_node
2997 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2998 widest_unsigned_literal_type_node
2999 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3000 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3001 widest_integer_literal_type_node));
3002 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3003 widest_unsigned_literal_type_node));
3005 build_common_tree_nodes_2 (flag_short_double);
3007 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3009 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3012 long_double_type_node));
3013 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3014 complex_integer_type_node));
3015 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3016 complex_float_type_node));
3017 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3018 complex_double_type_node));
3019 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3020 complex_long_double_type_node));
3021 pushdecl (build_decl (TYPE_DECL,
3022 ridpointers[(int) RID_VOID], void_type_node));
3024 #ifdef MD_INIT_BUILTINS
3028 wchar_type_node = get_identifier (flag_short_wchar
3029 ? "short unsigned int"
3031 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3032 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3033 signed_wchar_type_node = signed_type (wchar_type_node);
3034 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3036 boolean_type_node = integer_type_node;
3037 boolean_true_node = integer_one_node;
3038 boolean_false_node = integer_zero_node;
3040 string_type_node = build_pointer_type (char_type_node);
3041 const_string_type_node
3042 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3044 /* Make a type to be the domain of a few array types
3045 whose domains don't really matter.
3046 200 is small enough that it always fits in size_t
3047 and large enough that it can hold most function names for the
3048 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3049 array_domain_type = build_index_type (build_int_2 (200, 0));
3051 /* make a type for arrays of characters.
3052 With luck nothing will ever really depend on the length of this
3054 char_array_type_node
3055 = build_array_type (char_type_node, array_domain_type);
3057 /* Likewise for arrays of ints. */
3059 = build_array_type (integer_type_node, array_domain_type);
3061 /* This is for wide string constants. */
3062 wchar_array_type_node
3063 = build_array_type (wchar_type_node, array_domain_type);
3065 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3067 default_function_type
3068 = build_function_type (integer_type_node, NULL_TREE);
3070 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3072 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3074 endlink = void_list_node;
3075 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3077 = build_function_type (ptr_type_node,
3078 tree_cons (NULL_TREE, ptr_type_node, endlink));
3080 /* Types which are common to the fortran compiler and libf2c. When
3081 changing these, you also need to be concerned with f/com.h. */
3083 if (TYPE_PRECISION (float_type_node)
3084 == TYPE_PRECISION (long_integer_type_node))
3086 g77_integer_type_node = long_integer_type_node;
3087 g77_uinteger_type_node = long_unsigned_type_node;
3089 else if (TYPE_PRECISION (float_type_node)
3090 == TYPE_PRECISION (integer_type_node))
3092 g77_integer_type_node = integer_type_node;
3093 g77_uinteger_type_node = unsigned_type_node;
3096 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3098 if (g77_integer_type_node != NULL_TREE)
3100 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3101 g77_integer_type_node));
3102 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3103 g77_uinteger_type_node));
3106 if (TYPE_PRECISION (float_type_node) * 2
3107 == TYPE_PRECISION (long_integer_type_node))
3109 g77_longint_type_node = long_integer_type_node;
3110 g77_ulongint_type_node = long_unsigned_type_node;
3112 else if (TYPE_PRECISION (float_type_node) * 2
3113 == TYPE_PRECISION (long_long_integer_type_node))
3115 g77_longint_type_node = long_long_integer_type_node;
3116 g77_ulongint_type_node = long_long_unsigned_type_node;
3119 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3121 if (g77_longint_type_node != NULL_TREE)
3123 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3124 g77_longint_type_node));
3125 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3126 g77_ulongint_type_node));
3129 builtin_function ("__builtin_aggregate_incoming_address",
3130 build_function_type (ptr_type_node, NULL_TREE),
3131 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3132 BUILT_IN_NORMAL, NULL_PTR);
3134 /* Hooks for the DWARF 2 __throw routine. */
3135 builtin_function ("__builtin_unwind_init",
3136 build_function_type (void_type_node, endlink),
3137 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3138 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3139 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3140 builtin_function ("__builtin_dwarf_fp_regnum",
3141 build_function_type (unsigned_type_node, endlink),
3142 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3143 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3144 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3145 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3146 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3147 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3148 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3150 ("__builtin_eh_return",
3151 build_function_type (void_type_node,
3152 tree_cons (NULL_TREE, ptr_type_node,
3153 tree_cons (NULL_TREE,
3154 type_for_mode (ptr_mode, 0),
3155 tree_cons (NULL_TREE,
3158 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3160 pedantic_lvalues = pedantic;
3162 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3163 make_fname_decl = c_make_fname_decl;
3164 declare_function_name ();
3166 start_identifier_warnings ();
3168 /* Prepare to check format strings against argument lists. */
3169 init_function_format_info ();
3173 incomplete_decl_finalize_hook = finish_incomplete_decl;
3175 /* Record our roots. */
3177 ggc_add_tree_root (c_global_trees, CTI_MAX);
3178 ggc_add_tree_root (&named_labels, 1);
3179 ggc_add_tree_root (&shadowed_labels, 1);
3180 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3181 mark_binding_level);
3182 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3183 mark_binding_level);
3184 ggc_add_tree_root (&static_ctors, 1);
3185 ggc_add_tree_root (&static_dtors, 1);
3188 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3189 decl, NAME is the initialization string and TYPE_DEP indicates whether
3190 NAME depended on the type of the function. As we don't yet implement
3191 delayed emission of static data, we mark the decl as emitted
3192 so it is not placed in the output. Anything using it must therefore pull
3193 out the STRING_CST initializer directly. This does mean that these names
3194 are string merging candidates, which C99 does not permit. */
3197 c_make_fname_decl (id, name, type_dep)
3200 int type_dep ATTRIBUTE_UNUSED;
3202 tree decl, type, init;
3203 size_t length = strlen (name);
3205 type = build_array_type
3206 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3207 build_index_type (build_int_2 (length, 0)));
3209 decl = build_decl (VAR_DECL, id, type);
3210 TREE_STATIC (decl) = 1;
3211 TREE_READONLY (decl) = 1;
3212 TREE_ASM_WRITTEN (decl) = 1;
3213 DECL_SOURCE_LINE (decl) = 0;
3214 DECL_ARTIFICIAL (decl) = 1;
3215 DECL_IN_SYSTEM_HEADER (decl) = 1;
3216 DECL_IGNORED_P (decl) = 1;
3217 init = build_string (length + 1, name);
3218 TREE_TYPE (init) = type;
3219 DECL_INITIAL (decl) = init;
3220 finish_decl (pushdecl (decl), init, NULL_TREE);
3225 /* Return a definition for a builtin function named NAME and whose data type
3226 is TYPE. TYPE should be a function type with argument types.
3227 FUNCTION_CODE tells later passes how to compile calls to this function.
3228 See tree.h for its possible values.
3230 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3231 the name to be called if we can't opencode the function. */
3234 builtin_function (name, type, function_code, class, library_name)
3238 enum built_in_class class;
3239 const char *library_name;
3241 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3242 DECL_EXTERNAL (decl) = 1;
3243 TREE_PUBLIC (decl) = 1;
3244 /* If -traditional, permit redefining a builtin function any way you like.
3245 (Though really, if the program redefines these functions,
3246 it probably won't work right unless compiled with -fno-builtin.) */
3247 if (flag_traditional && name[0] != '_')
3248 DECL_BUILT_IN_NONANSI (decl) = 1;
3250 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3251 make_decl_rtl (decl, NULL_PTR, 1);
3253 DECL_BUILT_IN_CLASS (decl) = class;
3254 DECL_FUNCTION_CODE (decl) = function_code;
3256 /* Warn if a function in the namespace for users
3257 is used without an occasion to consider it declared. */
3258 if (name[0] != '_' || name[1] != '_')
3259 C_DECL_ANTICIPATED (decl) = 1;
3264 /* Called when a declaration is seen that contains no names to declare.
3265 If its type is a reference to a structure, union or enum inherited
3266 from a containing scope, shadow that tag name for the current scope
3267 with a forward reference.
3268 If its type defines a new named structure or union
3269 or defines an enum, it is valid but we need not do anything here.
3270 Otherwise, it is an error. */
3273 shadow_tag (declspecs)
3276 shadow_tag_warned (declspecs, 0);
3280 shadow_tag_warned (declspecs, warned)
3283 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3290 pending_invalid_xref = 0;
3292 /* Remove the attributes from declspecs, since they will confuse the
3294 split_specs_attrs (declspecs, &specs, &attrs);
3296 for (link = specs; link; link = TREE_CHAIN (link))
3298 register tree value = TREE_VALUE (link);
3299 register enum tree_code code = TREE_CODE (value);
3301 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3302 /* Used to test also that TYPE_SIZE (value) != 0.
3303 That caused warning for `struct foo;' at top level in the file. */
3305 register tree name = lookup_tag_reverse (value);
3312 if (warned != 1 && code != ENUMERAL_TYPE)
3313 /* Empty unnamed enum OK */
3315 pedwarn ("unnamed struct/union that defines no instances");
3321 t = lookup_tag (code, name, current_binding_level, 1);
3325 t = make_node (code);
3332 if (!warned && ! in_system_header)
3334 warning ("useless keyword or type name in empty declaration");
3341 error ("two types specified in one empty declaration");
3346 pedwarn ("empty declaration");
3350 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3353 groktypename (typename)
3356 if (TREE_CODE (typename) != TREE_LIST)
3358 return grokdeclarator (TREE_VALUE (typename),
3359 TREE_PURPOSE (typename),
3363 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3366 groktypename_in_parm_context (typename)
3369 if (TREE_CODE (typename) != TREE_LIST)
3371 return grokdeclarator (TREE_VALUE (typename),
3372 TREE_PURPOSE (typename),
3376 /* Decode a declarator in an ordinary declaration or data definition.
3377 This is called as soon as the type information and variable name
3378 have been parsed, before parsing the initializer if any.
3379 Here we create the ..._DECL node, fill in its type,
3380 and put it on the list of decls for the current context.
3381 The ..._DECL node is returned as the value.
3383 Exception: for arrays where the length is not specified,
3384 the type is left null, to be filled in by `finish_decl'.
3386 Function definitions do not come here; they go to start_function
3387 instead. However, external and forward declarations of functions
3388 do go through here. Structure field declarations are done by
3389 grokfield and not through here. */
3392 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3393 tree declarator, declspecs;
3395 tree attributes, prefix_attributes;
3397 register tree decl = grokdeclarator (declarator, declspecs,
3398 NORMAL, initialized);
3401 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3402 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3403 warning_with_decl (decl, "`%s' is usually a function");
3406 /* Is it valid for this decl to have an initializer at all?
3407 If not, set INITIALIZED to zero, which will indirectly
3408 tell `finish_decl' to ignore the initializer once it is parsed. */
3409 switch (TREE_CODE (decl))
3412 /* typedef foo = bar means give foo the same type as bar.
3413 We haven't parsed bar yet, so `finish_decl' will fix that up.
3414 Any other case of an initialization in a TYPE_DECL is an error. */
3415 if (pedantic || list_length (declspecs) > 1)
3417 error ("typedef `%s' is initialized",
3418 IDENTIFIER_POINTER (DECL_NAME (decl)));
3424 error ("function `%s' is initialized like a variable",
3425 IDENTIFIER_POINTER (DECL_NAME (decl)));
3430 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3431 error ("parameter `%s' is initialized",
3432 IDENTIFIER_POINTER (DECL_NAME (decl)));
3437 /* Don't allow initializations for incomplete types
3438 except for arrays which might be completed by the initialization. */
3439 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3441 /* A complete type is ok if size is fixed. */
3443 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3444 || C_DECL_VARIABLE_SIZE (decl))
3446 error ("variable-sized object may not be initialized");
3450 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3452 error ("variable `%s' has initializer but incomplete type",
3453 IDENTIFIER_POINTER (DECL_NAME (decl)));
3456 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3458 error ("elements of array `%s' have incomplete type",
3459 IDENTIFIER_POINTER (DECL_NAME (decl)));
3466 #if 0 /* Seems redundant with grokdeclarator. */
3467 if (current_binding_level != global_binding_level
3468 && DECL_EXTERNAL (decl)
3469 && TREE_CODE (decl) != FUNCTION_DECL)
3470 warning ("declaration of `%s' has `extern' and is initialized",
3471 IDENTIFIER_POINTER (DECL_NAME (decl)));
3473 DECL_EXTERNAL (decl) = 0;
3474 if (current_binding_level == global_binding_level)
3475 TREE_STATIC (decl) = 1;
3477 /* Tell `pushdecl' this is an initialized decl
3478 even though we don't yet have the initializer expression.
3479 Also tell `finish_decl' it may store the real initializer. */
3480 DECL_INITIAL (decl) = error_mark_node;
3483 /* If this is a function declaration, write a record describing it to the
3484 prototypes file (if requested). */
3486 if (TREE_CODE (decl) == FUNCTION_DECL)
3487 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3489 /* ANSI specifies that a tentative definition which is not merged with
3490 a non-tentative definition behaves exactly like a definition with an
3491 initializer equal to zero. (Section 3.7.2)
3492 -fno-common gives strict ANSI behavior. Usually you don't want it.
3493 This matters only for variables with external linkage. */
3494 if (! flag_no_common || ! TREE_PUBLIC (decl))
3495 DECL_COMMON (decl) = 1;
3497 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3498 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3501 /* Set attributes here so if duplicate decl, will have proper attributes. */
3502 decl_attributes (decl, attributes, prefix_attributes);
3504 /* Add this decl to the current binding level.
3505 TEM may equal DECL or it may be a previous decl of the same name. */
3506 tem = pushdecl (decl);
3508 /* For a local variable, define the RTL now. */
3509 if (current_binding_level != global_binding_level
3510 /* But not if this is a duplicate decl
3511 and we preserved the rtl from the previous one
3512 (which may or may not happen). */
3513 && DECL_RTL (tem) == 0)
3515 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3517 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3518 && DECL_INITIAL (tem) != 0)
3525 /* Finish processing of a declaration;
3526 install its initial value.
3527 If the length of an array type is not known before,
3528 it must be determined now, from the initial value, or it is an error. */
3531 finish_decl (decl, init, asmspec_tree)
3535 register tree type = TREE_TYPE (decl);
3536 int was_incomplete = (DECL_SIZE (decl) == 0);
3539 /* If a name was specified, get the string. */
3541 asmspec = TREE_STRING_POINTER (asmspec_tree);
3543 /* If `start_decl' didn't like having an initialization, ignore it now. */
3545 if (init != 0 && DECL_INITIAL (decl) == 0)
3547 /* Don't crash if parm is initialized. */
3548 if (TREE_CODE (decl) == PARM_DECL)
3551 if (ITERATOR_P (decl))
3554 error_with_decl (decl, "iterator has no initial value");
3556 init = save_expr (init);
3561 if (TREE_CODE (decl) != TYPE_DECL)
3562 store_init_value (decl, init);
3565 /* typedef foo = bar; store the type of bar as the type of foo. */
3566 TREE_TYPE (decl) = TREE_TYPE (init);
3567 DECL_INITIAL (decl) = init = 0;
3571 /* Deduce size of array from initialization, if not already known */
3573 if (TREE_CODE (type) == ARRAY_TYPE
3574 && TYPE_DOMAIN (type) == 0
3575 && TREE_CODE (decl) != TYPE_DECL)
3578 = (TREE_STATIC (decl)
3579 /* Even if pedantic, an external linkage array
3580 may have incomplete type at first. */
3581 ? pedantic && !TREE_PUBLIC (decl)
3582 : !DECL_EXTERNAL (decl));
3584 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3586 /* Get the completed type made by complete_array_type. */
3587 type = TREE_TYPE (decl);
3590 error_with_decl (decl, "initializer fails to determine size of `%s'");
3595 error_with_decl (decl, "array size missing in `%s'");
3596 /* If a `static' var's size isn't known,
3597 make it extern as well as static, so it does not get
3599 If it is not `static', then do not mark extern;
3600 finish_incomplete_decl will give it a default size
3601 and it will get allocated. */
3602 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3603 DECL_EXTERNAL (decl) = 1;
3606 /* TYPE_MAX_VALUE is always one less than the number of elements
3607 in the array, because we start counting at zero. Therefore,
3608 warn only if the value is less than zero. */
3609 if (pedantic && TYPE_DOMAIN (type) != 0
3610 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3611 error_with_decl (decl, "zero or negative size array `%s'");
3613 layout_decl (decl, 0);
3616 if (TREE_CODE (decl) == VAR_DECL)
3618 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3619 layout_decl (decl, 0);
3621 if (DECL_SIZE (decl) == 0
3622 && (TREE_STATIC (decl)
3624 /* A static variable with an incomplete type
3625 is an error if it is initialized.
3626 Also if it is not file scope.
3627 Otherwise, let it through, but if it is not `extern'
3628 then it may cause an error message later. */
3629 /* A duplicate_decls call could have changed an extern
3630 declaration into a file scope one. This can be detected
3631 by TREE_ASM_WRITTEN being set. */
3632 (DECL_INITIAL (decl) != 0
3633 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3635 /* An automatic variable with an incomplete type
3637 !DECL_EXTERNAL (decl)))
3639 error_with_decl (decl, "storage size of `%s' isn't known");
3640 TREE_TYPE (decl) = error_mark_node;
3643 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3644 && DECL_SIZE (decl) != 0)
3646 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3647 constant_expression_warning (DECL_SIZE (decl));
3649 error_with_decl (decl, "storage size of `%s' isn't constant");
3652 if (TREE_USED (type))
3653 TREE_USED (decl) = 1;
3656 /* If this is a function and an assembler name is specified, it isn't
3657 builtin any more. Also reset DECL_RTL so we can give it its new
3659 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3661 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3662 DECL_RTL (decl) = 0;
3663 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3666 /* Output the assembler code and/or RTL code for variables and functions,
3667 unless the type is an undefined structure or union.
3668 If not, it will get done when the type is completed. */
3670 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3672 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3673 maybe_objc_check_decl (decl);
3674 rest_of_decl_compilation (decl, asmspec,
3675 (DECL_CONTEXT (decl) == 0
3676 || TREE_ASM_WRITTEN (decl)), 0);
3678 if (DECL_CONTEXT (decl) != 0)
3680 /* Recompute the RTL of a local array now
3681 if it used to be an incomplete type. */
3683 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3685 /* If we used it already as memory, it must stay in memory. */
3686 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3687 /* If it's still incomplete now, no init will save it. */
3688 if (DECL_SIZE (decl) == 0)
3689 DECL_INITIAL (decl) = 0;
3692 /* Compute and store the initial value. */
3693 if (TREE_CODE (decl) != FUNCTION_DECL)
3694 expand_decl_init (decl);
3698 if (TREE_CODE (decl) == TYPE_DECL)
3700 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3701 maybe_objc_check_decl (decl);
3702 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3705 /* At the end of a declaration, throw away any variable type sizes
3706 of types defined inside that declaration. There is no use
3707 computing them in the following function definition. */
3708 if (current_binding_level == global_binding_level)
3709 get_pending_sizes ();
3712 /* If DECL has a cleanup, build and return that cleanup here.
3713 This is a callback called by expand_expr. */
3716 maybe_build_cleanup (decl)
3717 tree decl ATTRIBUTE_UNUSED;
3719 /* There are no cleanups in C. */
3723 /* Given a parsed parameter declaration,
3724 decode it into a PARM_DECL and push that on the current binding level.
3725 Also, for the sake of forward parm decls,
3726 record the given order of parms in `parm_order'. */
3729 push_parm_decl (parm)
3733 int old_immediate_size_expand = immediate_size_expand;
3734 /* Don't try computing parm sizes now -- wait till fn is called. */
3735 immediate_size_expand = 0;
3737 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3738 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3739 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3740 TREE_PURPOSE (TREE_VALUE (parm)));
3743 if (DECL_NAME (decl))
3746 olddecl = lookup_name (DECL_NAME (decl));
3747 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3748 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3752 decl = pushdecl (decl);
3754 immediate_size_expand = old_immediate_size_expand;
3756 current_binding_level->parm_order
3757 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3759 /* Add this decl to the current binding level. */
3760 finish_decl (decl, NULL_TREE, NULL_TREE);
3763 /* Clear the given order of parms in `parm_order'.
3764 Used at start of parm list,
3765 and also at semicolon terminating forward decls. */
3770 current_binding_level->parm_order = NULL_TREE;
3773 /* Make TYPE a complete type based on INITIAL_VALUE.
3774 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3775 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3778 complete_array_type (type, initial_value, do_default)
3783 register tree maxindex = NULL_TREE;
3788 /* Note MAXINDEX is really the maximum index,
3789 one less than the size. */
3790 if (TREE_CODE (initial_value) == STRING_CST)
3793 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3794 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3797 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3799 tree elts = CONSTRUCTOR_ELTS (initial_value);
3800 maxindex = build_int_2 (-1, -1);
3801 for (; elts; elts = TREE_CHAIN (elts))
3803 if (TREE_PURPOSE (elts))
3804 maxindex = TREE_PURPOSE (elts);
3806 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3807 maxindex, integer_one_node));
3809 maxindex = copy_node (maxindex);
3813 /* Make an error message unless that happened already. */
3814 if (initial_value != error_mark_node)
3817 /* Prevent further error messages. */
3818 maxindex = build_int_2 (0, 0);
3825 maxindex = build_int_2 (0, 0);
3831 TYPE_DOMAIN (type) = build_index_type (maxindex);
3832 if (!TREE_TYPE (maxindex))
3833 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3836 /* Lay out the type now that we can get the real answer. */
3843 /* Given declspecs and a declarator,
3844 determine the name and type of the object declared
3845 and construct a ..._DECL node for it.
3846 (In one case we can return a ..._TYPE node instead.
3847 For invalid input we sometimes return 0.)
3849 DECLSPECS is a chain of tree_list nodes whose value fields
3850 are the storage classes and type specifiers.
3852 DECL_CONTEXT says which syntactic context this declaration is in:
3853 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3854 FUNCDEF for a function definition. Like NORMAL but a few different
3855 error messages in each case. Return value may be zero meaning
3856 this definition is too screwy to try to parse.
3857 PARM for a parameter declaration (either within a function prototype
3858 or before a function body). Make a PARM_DECL, or return void_type_node.
3859 TYPENAME if for a typename (in a cast or sizeof).
3860 Don't make a DECL node; just return the ..._TYPE node.
3861 FIELD for a struct or union field; make a FIELD_DECL.
3862 BITFIELD for a field with specified width.
3863 INITIALIZED is 1 if the decl has an initializer.
3865 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3866 It may also be so in the PARM case, for a prototype where the
3867 argument type is specified but not the name.
3869 This function is where the complicated C meanings of `static'
3870 and `extern' are interpreted. */
3873 grokdeclarator (declarator, declspecs, decl_context, initialized)
3876 enum decl_context decl_context;
3881 tree type = NULL_TREE;
3886 int type_quals = TYPE_UNQUALIFIED;
3888 int explicit_int = 0;
3889 int explicit_char = 0;
3890 int defaulted_int = 0;
3891 tree typedef_decl = 0;
3893 tree typedef_type = 0;
3894 int funcdef_flag = 0;
3895 enum tree_code innermost_code = ERROR_MARK;
3897 int size_varies = 0;
3898 tree decl_machine_attr = NULL_TREE;
3900 if (decl_context == BITFIELD)
3901 bitfield = 1, decl_context = FIELD;
3903 if (decl_context == FUNCDEF)
3904 funcdef_flag = 1, decl_context = NORMAL;
3906 /* Look inside a declarator for the name being declared
3907 and get it as a string, for an error message. */
3909 register tree decl = declarator;
3913 switch (TREE_CODE (decl))
3918 innermost_code = TREE_CODE (decl);
3919 decl = TREE_OPERAND (decl, 0);
3922 case IDENTIFIER_NODE:
3923 name = IDENTIFIER_POINTER (decl);
3934 /* A function definition's declarator must have the form of
3935 a function declarator. */
3937 if (funcdef_flag && innermost_code != CALL_EXPR)
3940 /* Anything declared one level down from the top level
3941 must be one of the parameters of a function
3942 (because the body is at least two levels down). */
3944 /* If this looks like a function definition, make it one,
3945 even if it occurs where parms are expected.
3946 Then store_parm_decls will reject it and not use it as a parm. */
3947 if (decl_context == NORMAL && !funcdef_flag
3948 && current_binding_level->parm_flag)
3949 decl_context = PARM;
3951 /* Look through the decl specs and record which ones appear.
3952 Some typespecs are defined as built-in typenames.
3953 Others, the ones that are modifiers of other types,
3954 are represented by bits in SPECBITS: set the bits for
3955 the modifiers that appear. Storage class keywords are also in SPECBITS.
3957 If there is a typedef name or a type, store the type in TYPE.
3958 This includes builtin typedefs such as `int'.
3960 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3961 and did not come from a user typedef.
3963 Set LONGLONG if `long' is mentioned twice. */
3965 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3968 register tree id = TREE_VALUE (spec);
3970 if (id == ridpointers[(int) RID_INT])
3972 if (id == ridpointers[(int) RID_CHAR])
3975 if (TREE_CODE (id) == IDENTIFIER_NODE)
3976 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3978 if (ridpointers[i] == id)
3980 if (i == (int) RID_LONG && specbits & (1<<i))
3983 error ("`long long long' is too long for GCC");
3986 if (pedantic && !flag_isoc99 && ! in_system_header
3988 pedwarn ("ANSI C does not support `long long'");
3992 else if (specbits & (1 << i))
3993 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3999 error ("two or more data types in declaration of `%s'", name);
4000 /* Actual typedefs come to us as TYPE_DECL nodes. */
4001 else if (TREE_CODE (id) == TYPE_DECL)
4003 type = TREE_TYPE (id);
4004 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4007 /* Built-in types come as identifiers. */
4008 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4010 register tree t = lookup_name (id);
4011 if (TREE_TYPE (t) == error_mark_node)
4013 else if (!t || TREE_CODE (t) != TYPE_DECL)
4014 error ("`%s' fails to be a typedef or built in type",
4015 IDENTIFIER_POINTER (id));
4018 type = TREE_TYPE (t);
4022 else if (TREE_CODE (id) != ERROR_MARK)
4028 typedef_type = type;
4030 size_varies = C_TYPE_VARIABLE_SIZE (type);
4032 /* No type at all: default to `int', and set DEFAULTED_INT
4033 because it was not a user-defined typedef. */
4037 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4038 | (1 << (int) RID_SIGNED)
4039 | (1 << (int) RID_UNSIGNED))))
4040 /* Don't warn about typedef foo = bar. */
4041 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4042 && ! in_system_header)
4044 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4045 and this is a function, or if -Wimplicit; prefer the former
4046 warning since it is more explicit. */
4047 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4048 warn_about_return_type = 1;
4049 else if (warn_implicit_int || flag_isoc99)
4050 pedwarn_c99 ("type defaults to `int' in declaration of `%s'", name);
4054 type = integer_type_node;
4057 /* Now process the modifiers that were specified
4058 and check for invalid combinations. */
4060 /* Long double is a special combination. */
4062 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4063 && TYPE_MAIN_VARIANT (type) == double_type_node)
4065 specbits &= ~ (1 << (int) RID_LONG);
4066 type = long_double_type_node;
4069 /* Check all other uses of type modifiers. */
4071 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4072 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4076 if ((specbits & 1 << (int) RID_LONG)
4077 && (specbits & 1 << (int) RID_SHORT))
4078 error ("both long and short specified for `%s'", name);
4079 else if (((specbits & 1 << (int) RID_LONG)
4080 || (specbits & 1 << (int) RID_SHORT))
4082 error ("long or short specified with char for `%s'", name);
4083 else if (((specbits & 1 << (int) RID_LONG)
4084 || (specbits & 1 << (int) RID_SHORT))
4085 && TREE_CODE (type) == REAL_TYPE)
4087 static int already = 0;
4089 error ("long or short specified with floating type for `%s'", name);
4090 if (! already && ! pedantic)
4092 error ("the only valid combination is `long double'");
4096 else if ((specbits & 1 << (int) RID_SIGNED)
4097 && (specbits & 1 << (int) RID_UNSIGNED))
4098 error ("both signed and unsigned specified for `%s'", name);
4099 else if (TREE_CODE (type) != INTEGER_TYPE)
4100 error ("long, short, signed or unsigned invalid for `%s'", name);
4104 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4106 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4108 if (flag_pedantic_errors)
4113 /* Discard the type modifiers if they are invalid. */
4116 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4117 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4122 if ((specbits & (1 << (int) RID_COMPLEX))
4123 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4125 error ("complex invalid for `%s'", name);
4126 specbits &= ~ (1 << (int) RID_COMPLEX);
4129 /* Decide whether an integer type is signed or not.
4130 Optionally treat bitfields as signed by default. */
4131 if (specbits & 1 << (int) RID_UNSIGNED
4132 /* Traditionally, all bitfields are unsigned. */
4133 || (bitfield && flag_traditional
4134 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4135 || (bitfield && ! flag_signed_bitfields
4136 && (explicit_int || defaulted_int || explicit_char
4137 /* A typedef for plain `int' without `signed'
4138 can be controlled just like plain `int'. */
4139 || ! (typedef_decl != 0
4140 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4141 && TREE_CODE (type) != ENUMERAL_TYPE
4142 && !(specbits & 1 << (int) RID_SIGNED)))
4145 type = long_long_unsigned_type_node;
4146 else if (specbits & 1 << (int) RID_LONG)
4147 type = long_unsigned_type_node;
4148 else if (specbits & 1 << (int) RID_SHORT)
4149 type = short_unsigned_type_node;
4150 else if (type == char_type_node)
4151 type = unsigned_char_type_node;
4152 else if (typedef_decl)
4153 type = unsigned_type (type);
4155 type = unsigned_type_node;
4157 else if ((specbits & 1 << (int) RID_SIGNED)
4158 && type == char_type_node)
4159 type = signed_char_type_node;
4161 type = long_long_integer_type_node;
4162 else if (specbits & 1 << (int) RID_LONG)
4163 type = long_integer_type_node;
4164 else if (specbits & 1 << (int) RID_SHORT)
4165 type = short_integer_type_node;
4167 if (specbits & 1 << (int) RID_COMPLEX)
4169 /* If we just have "complex", it is equivalent to
4170 "complex double", but if any modifiers at all are specified it is
4171 the complex form of TYPE. E.g, "complex short" is
4172 "complex short int". */
4174 if (defaulted_int && ! longlong
4175 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4176 | (1 << (int) RID_SIGNED)
4177 | (1 << (int) RID_UNSIGNED))))
4178 type = complex_double_type_node;
4179 else if (type == integer_type_node)
4180 type = complex_integer_type_node;
4181 else if (type == float_type_node)
4182 type = complex_float_type_node;
4183 else if (type == double_type_node)
4184 type = complex_double_type_node;
4185 else if (type == long_double_type_node)
4186 type = complex_long_double_type_node;
4188 type = build_complex_type (type);
4191 /* Figure out the type qualifiers for the declaration. There are
4192 two ways a declaration can become qualified. One is something
4193 like `const int i' where the `const' is explicit. Another is
4194 something like `typedef const int CI; CI i' where the type of the
4195 declaration contains the `const'. */
4196 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4197 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4198 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4199 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4200 if (constp > 1 && ! flag_isoc99)
4201 pedwarn ("duplicate `const'");
4202 if (restrictp > 1 && ! flag_isoc99)
4203 pedwarn ("duplicate `restrict'");
4204 if (volatilep > 1 && ! flag_isoc99)
4205 pedwarn ("duplicate `volatile'");
4206 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4207 type = TYPE_MAIN_VARIANT (type);
4208 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4209 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4210 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4212 /* Warn if two storage classes are given. Default to `auto'. */
4217 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4218 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4219 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4220 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4221 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4222 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4224 /* Warn about storage classes that are invalid for certain
4225 kinds of declarations (parameters, typenames, etc.). */
4228 error ("multiple storage classes in declaration of `%s'", name);
4229 else if (funcdef_flag
4231 & ((1 << (int) RID_REGISTER)
4232 | (1 << (int) RID_AUTO)
4233 | (1 << (int) RID_TYPEDEF))))
4235 if (specbits & 1 << (int) RID_AUTO
4236 && (pedantic || current_binding_level == global_binding_level))
4237 pedwarn ("function definition declared `auto'");
4238 if (specbits & 1 << (int) RID_REGISTER)
4239 error ("function definition declared `register'");
4240 if (specbits & 1 << (int) RID_TYPEDEF)
4241 error ("function definition declared `typedef'");
4242 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4243 | (1 << (int) RID_AUTO));
4245 else if (decl_context != NORMAL && nclasses > 0)
4247 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4251 switch (decl_context)
4254 error ("storage class specified for structure field `%s'", name);
4257 error ("storage class specified for parameter `%s'", name);
4260 error ("storage class specified for typename");
4263 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4264 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4265 | (1 << (int) RID_EXTERN));
4268 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4270 /* `extern' with initialization is invalid if not at top level. */
4271 if (current_binding_level == global_binding_level)
4272 warning ("`%s' initialized and declared `extern'", name);
4274 error ("`%s' has both `extern' and initializer", name);
4276 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4277 && current_binding_level != global_binding_level)
4278 error ("nested function `%s' declared `extern'", name);
4279 else if (current_binding_level == global_binding_level
4280 && specbits & (1 << (int) RID_AUTO))
4281 error ("top-level declaration of `%s' specifies `auto'", name);
4282 else if ((specbits & 1 << (int) RID_ITERATOR)
4283 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4285 error ("iterator `%s' has derived type", name);
4286 type = error_mark_node;
4288 else if ((specbits & 1 << (int) RID_ITERATOR)
4289 && TREE_CODE (type) != INTEGER_TYPE)
4291 error ("iterator `%s' has noninteger type", name);
4292 type = error_mark_node;
4296 /* Now figure out the structure of the declarator proper.
4297 Descend through it, creating more complex types, until we reach
4298 the declared identifier (or NULL_TREE, in an absolute declarator). */
4300 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4302 if (type == error_mark_node)
4304 declarator = TREE_OPERAND (declarator, 0);
4308 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4309 an INDIRECT_REF (for *...),
4310 a CALL_EXPR (for ...(...)),
4311 an identifier (for the name being declared)
4312 or a null pointer (for the place in an absolute declarator
4313 where the name was omitted).
4314 For the last two cases, we have just exited the loop.
4316 At this point, TYPE is the type of elements of an array,
4317 or for a function to return, or for a pointer to point to.
4318 After this sequence of ifs, TYPE is the type of the
4319 array or function or pointer, and DECLARATOR has had its
4320 outermost layer removed. */
4322 if (TREE_CODE (declarator) == ARRAY_REF)
4324 register tree itype = NULL_TREE;
4325 register tree size = TREE_OPERAND (declarator, 1);
4326 /* The index is a signed object `sizetype' bits wide. */
4327 tree index_type = signed_type (sizetype);
4329 declarator = TREE_OPERAND (declarator, 0);
4331 /* Check for some types that there cannot be arrays of. */
4333 if (VOID_TYPE_P (type))
4335 error ("declaration of `%s' as array of voids", name);
4336 type = error_mark_node;
4339 if (TREE_CODE (type) == FUNCTION_TYPE)
4341 error ("declaration of `%s' as array of functions", name);
4342 type = error_mark_node;
4345 if (size == error_mark_node)
4346 type = error_mark_node;
4348 if (type == error_mark_node)
4351 /* If size was specified, set ITYPE to a range-type for that size.
4352 Otherwise, ITYPE remains null. finish_decl may figure it out
4353 from an initial value. */
4357 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4358 STRIP_TYPE_NOPS (size);
4360 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4361 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4363 error ("size of array `%s' has non-integer type", name);
4364 size = integer_one_node;
4367 if (pedantic && integer_zerop (size))
4368 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4370 if (TREE_CODE (size) == INTEGER_CST)
4372 constant_expression_warning (size);
4373 if (tree_int_cst_sgn (size) < 0)
4375 error ("size of array `%s' is negative", name);
4376 size = integer_one_node;
4381 /* Make sure the array size remains visibly nonconstant
4382 even if it is (eg) a const variable with known value. */
4387 if (TREE_CONSTANT (size))
4388 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4390 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4394 /* Convert size to index_type, so that if it is a variable
4395 the computations will be done in the proper mode. */
4396 itype = fold (build (MINUS_EXPR, index_type,
4397 convert (index_type, size),
4398 convert (index_type, size_one_node)));
4400 /* If that overflowed, the array is too big.
4401 ??? While a size of INT_MAX+1 technically shouldn't cause
4402 an overflow (because we subtract 1), the overflow is recorded
4403 during the conversion to index_type, before the subtraction.
4404 Handling this case seems like an unnecessary complication. */
4405 if (TREE_OVERFLOW (itype))
4407 error ("size of array `%s' is too large", name);
4408 type = error_mark_node;
4413 itype = variable_size (itype);
4414 itype = build_index_type (itype);
4417 #if 0 /* This had bad results for pointers to arrays, as in
4418 union incomplete (*foo)[4]; */
4419 /* Complain about arrays of incomplete types, except in typedefs. */
4421 if (!COMPLETE_TYPE_P (type)
4422 /* Avoid multiple warnings for nested array types. */
4423 && TREE_CODE (type) != ARRAY_TYPE
4424 && !(specbits & (1 << (int) RID_TYPEDEF))
4425 && !C_TYPE_BEING_DEFINED (type))
4426 warning ("array type has incomplete element type");
4429 #if 0 /* We shouldn't have a function type here at all!
4430 Functions aren't allowed as array elements. */
4431 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4432 && (constp || volatilep))
4433 pedwarn ("ANSI C forbids const or volatile function types");
4436 /* Build the array type itself, then merge any constancy or
4437 volatility into the target type. We must do it in this order
4438 to ensure that the TYPE_MAIN_VARIANT field of the array type
4439 is set correctly. */
4441 type = build_array_type (type, itype);
4443 type = c_build_qualified_type (type, type_quals);
4445 #if 0 /* don't clear these; leave them set so that the array type
4446 or the variable is itself const or volatile. */
4447 type_quals = TYPE_UNQUALIFIED;
4451 C_TYPE_VARIABLE_SIZE (type) = 1;
4453 else if (TREE_CODE (declarator) == CALL_EXPR)
4457 /* Declaring a function type.
4458 Make sure we have a valid type for the function to return. */
4459 if (type == error_mark_node)
4464 /* Warn about some types functions can't return. */
4466 if (TREE_CODE (type) == FUNCTION_TYPE)
4468 error ("`%s' declared as function returning a function", name);
4469 type = integer_type_node;
4471 if (TREE_CODE (type) == ARRAY_TYPE)
4473 error ("`%s' declared as function returning an array", name);
4474 type = integer_type_node;
4477 #ifndef TRADITIONAL_RETURN_FLOAT
4478 /* Traditionally, declaring return type float means double. */
4480 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4481 type = double_type_node;
4482 #endif /* TRADITIONAL_RETURN_FLOAT */
4484 /* Construct the function type and go to the next
4485 inner layer of declarator. */
4487 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4489 /* Say it's a definition
4490 only for the CALL_EXPR
4491 closest to the identifier. */
4492 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4493 /* Type qualifiers before the return type of the function
4494 qualify the return type, not the function type. */
4496 type = c_build_qualified_type (type, type_quals);
4497 type_quals = TYPE_UNQUALIFIED;
4499 type = build_function_type (type, arg_types);
4500 declarator = TREE_OPERAND (declarator, 0);
4502 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4503 the formal parameter list of this FUNCTION_TYPE to point to
4504 the FUNCTION_TYPE node itself. */
4509 for (link = last_function_parm_tags;
4511 link = TREE_CHAIN (link))
4512 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4515 else if (TREE_CODE (declarator) == INDIRECT_REF)
4517 /* Merge any constancy or volatility into the target type
4520 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4522 pedwarn ("ANSI C forbids qualified function types");
4524 type = c_build_qualified_type (type, type_quals);
4525 type_quals = TYPE_UNQUALIFIED;
4528 type = build_pointer_type (type);
4530 /* Process a list of type modifier keywords
4531 (such as const or volatile) that were given inside the `*'. */
4533 if (TREE_TYPE (declarator))
4535 register tree typemodlist;
4541 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4542 typemodlist = TREE_CHAIN (typemodlist))
4544 tree qualifier = TREE_VALUE (typemodlist);
4546 if (qualifier == ridpointers[(int) RID_CONST])
4548 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4550 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4555 error ("invalid type modifier within pointer declarator");
4558 if (constp > 1 && ! flag_isoc99)
4559 pedwarn ("duplicate `const'");
4560 if (volatilep > 1 && ! flag_isoc99)
4561 pedwarn ("duplicate `volatile'");
4562 if (restrictp > 1 && ! flag_isoc99)
4563 pedwarn ("duplicate `restrict'");
4565 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4566 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4567 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4570 declarator = TREE_OPERAND (declarator, 0);
4577 /* Now TYPE has the actual type. */
4579 /* Did array size calculations overflow? */
4581 if (TREE_CODE (type) == ARRAY_TYPE
4582 && COMPLETE_TYPE_P (type)
4583 && TREE_OVERFLOW (TYPE_SIZE (type)))
4584 error ("size of array `%s' is too large", name);
4586 /* If this is declaring a typedef name, return a TYPE_DECL. */
4588 if (specbits & (1 << (int) RID_TYPEDEF))
4591 /* Note that the grammar rejects storage classes
4592 in typenames, fields or parameters */
4593 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4595 pedwarn ("ANSI C forbids qualified function types");
4597 type = c_build_qualified_type (type, type_quals);
4598 decl = build_decl (TYPE_DECL, declarator, type);
4599 if ((specbits & (1 << (int) RID_SIGNED))
4600 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4601 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4605 /* Detect the case of an array type of unspecified size
4606 which came, as such, direct from a typedef name.
4607 We must copy the type, so that each identifier gets
4608 a distinct type, so that each identifier's size can be
4609 controlled separately by its own initializer. */
4611 if (type != 0 && typedef_type != 0
4612 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4613 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4615 type = build_array_type (TREE_TYPE (type), 0);
4617 C_TYPE_VARIABLE_SIZE (type) = 1;
4620 /* If this is a type name (such as, in a cast or sizeof),
4621 compute the type and return it now. */
4623 if (decl_context == TYPENAME)
4625 /* Note that the grammar rejects storage classes
4626 in typenames, fields or parameters */
4627 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4629 pedwarn ("ANSI C forbids const or volatile function types");
4631 type = c_build_qualified_type (type, type_quals);
4635 /* Aside from typedefs and type names (handle above),
4636 `void' at top level (not within pointer)
4637 is allowed only in public variables.
4638 We don't complain about parms either, but that is because
4639 a better error message can be made later. */
4641 if (VOID_TYPE_P (type) && decl_context != PARM
4642 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4643 && ((specbits & (1 << (int) RID_EXTERN))
4644 || (current_binding_level == global_binding_level
4646 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4648 error ("variable or field `%s' declared void", name);
4649 type = integer_type_node;
4652 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4653 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4658 if (decl_context == PARM)
4660 tree type_as_written = type;
4663 /* A parameter declared as an array of T is really a pointer to T.
4664 One declared as a function is really a pointer to a function. */
4666 if (TREE_CODE (type) == ARRAY_TYPE)
4668 /* Transfer const-ness of array into that of type pointed to. */
4669 type = TREE_TYPE (type);
4671 type = c_build_qualified_type (type, type_quals);
4672 type = build_pointer_type (type);
4673 type_quals = TYPE_UNQUALIFIED;
4676 else if (TREE_CODE (type) == FUNCTION_TYPE)
4678 if (pedantic && type_quals)
4679 pedwarn ("ANSI C forbids qualified function types");
4681 type = c_build_qualified_type (type, type_quals);
4682 type = build_pointer_type (type);
4683 type_quals = TYPE_UNQUALIFIED;
4686 decl = build_decl (PARM_DECL, declarator, type);
4688 C_DECL_VARIABLE_SIZE (decl) = 1;
4690 /* Compute the type actually passed in the parmlist,
4691 for the case where there is no prototype.
4692 (For example, shorts and chars are passed as ints.)
4693 When there is a prototype, this is overridden later. */
4695 if (type == error_mark_node)
4696 promoted_type = type;
4699 promoted_type = simple_type_promotes_to (type);
4700 if (! promoted_type)
4701 promoted_type = type;
4704 DECL_ARG_TYPE (decl) = promoted_type;
4705 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4707 else if (decl_context == FIELD)
4709 /* Structure field. It may not be a function. */
4711 if (TREE_CODE (type) == FUNCTION_TYPE)
4713 error ("field `%s' declared as a function", name);
4714 type = build_pointer_type (type);
4716 else if (TREE_CODE (type) != ERROR_MARK
4717 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4719 error ("field `%s' has incomplete type", name);
4720 type = error_mark_node;
4722 /* Move type qualifiers down to element of an array. */
4723 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4725 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4727 TYPE_DOMAIN (type));
4728 #if 0 /* Leave the field const or volatile as well. */
4729 type_quals = TYPE_UNQUALIFIED;
4732 decl = build_decl (FIELD_DECL, declarator, type);
4733 DECL_NONADDRESSABLE_P (decl) = bitfield;
4736 C_DECL_VARIABLE_SIZE (decl) = 1;
4738 else if (TREE_CODE (type) == FUNCTION_TYPE)
4740 /* Every function declaration is "external"
4741 except for those which are inside a function body
4742 in which `auto' is used.
4743 That is a case not specified by ANSI C,
4744 and we use it for forward declarations for nested functions. */
4745 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4746 || current_binding_level == global_binding_level);
4748 if (specbits & (1 << (int) RID_AUTO)
4749 && (pedantic || current_binding_level == global_binding_level))
4750 pedwarn ("invalid storage class for function `%s'", name);
4751 if (specbits & (1 << (int) RID_REGISTER))
4752 error ("invalid storage class for function `%s'", name);
4753 /* Function declaration not at top level.
4754 Storage classes other than `extern' are not allowed
4755 and `extern' makes no difference. */
4756 if (current_binding_level != global_binding_level
4757 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4759 pedwarn ("invalid storage class for function `%s'", name);
4761 decl = build_decl (FUNCTION_DECL, declarator, type);
4762 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4764 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4765 pedwarn ("ANSI C forbids qualified function types");
4768 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4769 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4770 && ! DECL_IN_SYSTEM_HEADER (decl))
4771 pedwarn ("ANSI C forbids qualified void function return type");
4773 /* GNU C interprets a `volatile void' return type to indicate
4774 that the function does not return. */
4775 if ((type_quals & TYPE_QUAL_VOLATILE)
4776 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4777 warning ("`noreturn' function returns non-void value");
4780 DECL_EXTERNAL (decl) = 1;
4781 /* Record absence of global scope for `static' or `auto'. */
4783 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4785 /* Record presence of `inline', if it is reasonable. */
4788 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4789 warning ("cannot inline function `main'");
4791 /* Assume that otherwise the function can be inlined. */
4792 DECL_INLINE (decl) = 1;
4794 if (specbits & (1 << (int) RID_EXTERN))
4795 current_extern_inline = 1;
4800 /* It's a variable. */
4801 /* An uninitialized decl with `extern' is a reference. */
4802 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4804 /* Move type qualifiers down to element of an array. */
4805 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4807 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4809 TYPE_DOMAIN (type));
4810 #if 0 /* Leave the variable const or volatile as well. */
4811 type_quals = TYPE_UNQUALIFIED;
4815 decl = build_decl (VAR_DECL, declarator, type);
4817 C_DECL_VARIABLE_SIZE (decl) = 1;
4820 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4822 DECL_EXTERNAL (decl) = extern_ref;
4823 /* At top level, the presence of a `static' or `register' storage
4824 class specifier, or the absence of all storage class specifiers
4825 makes this declaration a definition (perhaps tentative). Also,
4826 the absence of both `static' and `register' makes it public. */
4827 if (current_binding_level == global_binding_level)
4831 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4832 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4834 /* Not at top level, only `static' makes a static definition. */
4837 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4838 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4841 if (specbits & 1 << (int) RID_ITERATOR)
4842 ITERATOR_P (decl) = 1;
4845 /* Record `register' declaration for warnings on &
4846 and in case doing stupid register allocation. */
4848 if (specbits & (1 << (int) RID_REGISTER))
4849 DECL_REGISTER (decl) = 1;
4851 /* Record constancy and volatility. */
4852 c_apply_type_quals_to_decl (type_quals, decl);
4854 /* If a type has volatile components, it should be stored in memory.
4855 Otherwise, the fact that those components are volatile
4856 will be ignored, and would even crash the compiler. */
4857 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4858 mark_addressable (decl);
4864 /* Decode the parameter-list info for a function type or function definition.
4865 The argument is the value returned by `get_parm_info' (or made in parse.y
4866 if there is an identifier list instead of a parameter decl list).
4867 These two functions are separate because when a function returns
4868 or receives functions then each is called multiple times but the order
4869 of calls is different. The last call to `grokparms' is always the one
4870 that contains the formal parameter names of a function definition.
4872 Store in `last_function_parms' a chain of the decls of parms.
4873 Also store in `last_function_parm_tags' a chain of the struct, union,
4874 and enum tags declared among the parms.
4876 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4878 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4879 a mere declaration. A nonempty identifier-list gets an error message
4880 when FUNCDEF_FLAG is zero. */
4883 grokparms (parms_info, funcdef_flag)
4887 tree first_parm = TREE_CHAIN (parms_info);
4889 last_function_parms = TREE_PURPOSE (parms_info);
4890 last_function_parm_tags = TREE_VALUE (parms_info);
4892 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4893 && !in_system_header)
4894 warning ("function declaration isn't a prototype");
4897 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4900 pedwarn ("parameter names (without types) in function declaration");
4902 last_function_parms = first_parm;
4909 /* We no longer test FUNCDEF_FLAG.
4910 If the arg types are incomplete in a declaration,
4911 they must include undefined tags.
4912 These tags can never be defined in the scope of the declaration,
4913 so the types can never be completed,
4914 and no call can be compiled successfully. */
4916 /* In a fcn definition, arg types must be complete. */
4919 for (parm = last_function_parms, typelt = first_parm;
4921 parm = TREE_CHAIN (parm))
4922 /* Skip over any enumeration constants declared here. */
4923 if (TREE_CODE (parm) == PARM_DECL)
4925 /* Barf if the parameter itself has an incomplete type. */
4926 tree type = TREE_VALUE (typelt);
4927 if (!COMPLETE_TYPE_P (type))
4929 if (funcdef_flag && DECL_NAME (parm) != 0)
4930 error ("parameter `%s' has incomplete type",
4931 IDENTIFIER_POINTER (DECL_NAME (parm)));
4933 warning ("parameter has incomplete type");
4936 TREE_VALUE (typelt) = error_mark_node;
4937 TREE_TYPE (parm) = error_mark_node;
4940 #if 0 /* This has been replaced by parm_tags_warning
4941 which uses a more accurate criterion for what to warn about. */
4944 /* Now warn if is a pointer to an incomplete type. */
4945 while (TREE_CODE (type) == POINTER_TYPE
4946 || TREE_CODE (type) == REFERENCE_TYPE)
4947 type = TREE_TYPE (type);
4948 type = TYPE_MAIN_VARIANT (type);
4949 if (!COMPLETE_TYPE_P (type))
4951 if (DECL_NAME (parm) != 0)
4952 warning ("parameter `%s' points to incomplete type",
4953 IDENTIFIER_POINTER (DECL_NAME (parm)));
4955 warning ("parameter points to incomplete type");
4959 typelt = TREE_CHAIN (typelt);
4967 /* Return a tree_list node with info on a parameter list just parsed.
4968 The TREE_PURPOSE is a chain of decls of those parms.
4969 The TREE_VALUE is a list of structure, union and enum tags defined.
4970 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4971 This tree_list node is later fed to `grokparms'.
4973 VOID_AT_END nonzero means append `void' to the end of the type-list.
4974 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4977 get_parm_info (void_at_end)
4980 register tree decl, t;
4981 register tree types = 0;
4983 tree tags = gettags ();
4984 tree parms = getdecls ();
4986 tree order = current_binding_level->parm_order;
4988 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4989 if (void_at_end && parms != 0
4990 && TREE_CHAIN (parms) == 0
4991 && VOID_TYPE_P (TREE_TYPE (parms))
4992 && DECL_NAME (parms) == 0)
4995 storedecls (NULL_TREE);
4996 return tree_cons (NULL_TREE, NULL_TREE,
4997 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5000 /* Extract enumerator values and other non-parms declared with the parms.
5001 Likewise any forward parm decls that didn't have real parm decls. */
5002 for (decl = parms; decl; )
5004 tree next = TREE_CHAIN (decl);
5006 if (TREE_CODE (decl) != PARM_DECL)
5008 TREE_CHAIN (decl) = new_parms;
5011 else if (TREE_ASM_WRITTEN (decl))
5013 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5014 TREE_CHAIN (decl) = new_parms;
5020 /* Put the parm decls back in the order they were in in the parm list. */
5021 for (t = order; t; t = TREE_CHAIN (t))
5024 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5026 TREE_CHAIN (TREE_VALUE (t)) = 0;
5029 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5032 /* Store the parmlist in the binding level since the old one
5033 is no longer a valid list. (We have changed the chain pointers.) */
5034 storedecls (new_parms);
5036 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5037 /* There may also be declarations for enumerators if an enumeration
5038 type is declared among the parms. Ignore them here. */
5039 if (TREE_CODE (decl) == PARM_DECL)
5041 /* Since there is a prototype,
5042 args are passed in their declared types. */
5043 tree type = TREE_TYPE (decl);
5044 DECL_ARG_TYPE (decl) = type;
5045 if (PROMOTE_PROTOTYPES
5046 && (TREE_CODE (type) == INTEGER_TYPE
5047 || TREE_CODE (type) == ENUMERAL_TYPE)
5048 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5049 DECL_ARG_TYPE (decl) = integer_type_node;
5051 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5052 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5053 && DECL_NAME (decl) == 0)
5055 error ("`void' in parameter list must be the entire list");
5061 return tree_cons (new_parms, tags,
5062 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5064 return tree_cons (new_parms, tags, nreverse (types));
5067 /* At end of parameter list, warn about any struct, union or enum tags
5068 defined within. Do so because these types cannot ever become complete. */
5071 parmlist_tags_warning ()
5076 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5078 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5079 /* An anonymous union parm type is meaningful as a GNU extension.
5080 So don't warn for that. */
5081 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5083 if (TREE_PURPOSE (elt) != 0)
5084 warning ("`%s %s' declared inside parameter list",
5085 (code == RECORD_TYPE ? "struct"
5086 : code == UNION_TYPE ? "union"
5088 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5091 /* For translation these need to be seperate warnings */
5092 if (code == RECORD_TYPE)
5093 warning ("anonymous struct declared inside parameter list");
5094 else if (code == UNION_TYPE)
5095 warning ("anonymous union declared inside parameter list");
5097 warning ("anonymous enum declared inside parameter list");
5101 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5107 /* Get the struct, enum or union (CODE says which) with tag NAME.
5108 Define the tag as a forward-reference if it is not defined. */
5111 xref_tag (code, name)
5112 enum tree_code code;
5115 /* If a cross reference is requested, look up the type
5116 already defined for this tag and return it. */
5118 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5119 /* Even if this is the wrong type of tag, return what we found.
5120 There will be an error message anyway, from pending_xref_error.
5121 If we create an empty xref just for an invalid use of the type,
5122 the main result is to create lots of superfluous error messages. */
5126 /* If no such tag is yet defined, create a forward-reference node
5127 and record it as the "definition".
5128 When a real declaration of this type is found,
5129 the forward-reference will be altered into a real type. */
5131 ref = make_node (code);
5132 if (code == ENUMERAL_TYPE)
5134 /* (In ANSI, Enums can be referred to only if already defined.) */
5136 pedwarn ("ANSI C forbids forward references to `enum' types");
5137 /* Give the type a default layout like unsigned int
5138 to avoid crashing if it does not get defined. */
5139 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5140 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5141 TYPE_USER_ALIGN (ref) = 0;
5142 TREE_UNSIGNED (ref) = 1;
5143 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5144 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5145 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5148 pushtag (name, ref);
5153 /* Make sure that the tag NAME is defined *in the current binding level*
5154 at least as a forward reference.
5155 CODE says which kind of tag NAME ought to be. */
5158 start_struct (code, name)
5159 enum tree_code code;
5162 /* If there is already a tag defined at this binding level
5163 (as a forward reference), just return it. */
5165 register tree ref = 0;
5168 ref = lookup_tag (code, name, current_binding_level, 1);
5169 if (ref && TREE_CODE (ref) == code)
5171 C_TYPE_BEING_DEFINED (ref) = 1;
5172 TYPE_PACKED (ref) = flag_pack_struct;
5173 if (TYPE_FIELDS (ref))
5174 error ("redefinition of `%s %s'",
5175 code == UNION_TYPE ? "union" : "struct",
5176 IDENTIFIER_POINTER (name));
5181 /* Otherwise create a forward-reference just so the tag is in scope. */
5183 ref = make_node (code);
5184 pushtag (name, ref);
5185 C_TYPE_BEING_DEFINED (ref) = 1;
5186 TYPE_PACKED (ref) = flag_pack_struct;
5190 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5191 of a structure component, returning a FIELD_DECL node.
5192 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5194 This is done during the parsing of the struct declaration.
5195 The FIELD_DECL nodes are chained together and the lot of them
5196 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5199 grokfield (filename, line, declarator, declspecs, width)
5200 const char *filename ATTRIBUTE_UNUSED;
5201 int line ATTRIBUTE_UNUSED;
5202 tree declarator, declspecs, width;
5206 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5208 finish_decl (value, NULL_TREE, NULL_TREE);
5209 DECL_INITIAL (value) = width;
5211 maybe_objc_check_decl (value);
5215 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5216 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5217 ATTRIBUTES are attributes to be applied to the structure. */
5220 finish_struct (t, fieldlist, attributes)
5226 int toplevel = global_binding_level == current_binding_level;
5228 /* If this type was previously laid out as a forward reference,
5229 make sure we lay it out again. */
5233 decl_attributes (t, attributes, NULL_TREE);
5235 /* Nameless union parm types are useful as GCC extension. */
5236 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5237 /* Otherwise, warn about any struct or union def. in parmlist. */
5238 if (in_parm_level_p ())
5241 pedwarn ("%s defined inside parms",
5242 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5243 else if (! flag_traditional)
5244 warning ("%s defined inside parms",
5245 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5250 for (x = fieldlist; x; x = TREE_CHAIN (x))
5251 if (DECL_NAME (x) != 0)
5255 pedwarn ("%s has no %s",
5256 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5257 fieldlist ? _("named members") : _("members"));
5260 /* Install struct as DECL_CONTEXT of each field decl.
5261 Also process specified field sizes,m which is found in the DECL_INITIAL.
5262 Store 0 there, except for ": 0" fields (so we can find them
5263 and delete them, below). */
5265 for (x = fieldlist; x; x = TREE_CHAIN (x))
5267 DECL_CONTEXT (x) = t;
5268 DECL_PACKED (x) |= TYPE_PACKED (t);
5270 /* If any field is const, the structure type is pseudo-const. */
5271 if (TREE_READONLY (x))
5272 C_TYPE_FIELDS_READONLY (t) = 1;
5275 /* A field that is pseudo-const makes the structure likewise. */
5276 tree t1 = TREE_TYPE (x);
5277 while (TREE_CODE (t1) == ARRAY_TYPE)
5278 t1 = TREE_TYPE (t1);
5279 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5280 && C_TYPE_FIELDS_READONLY (t1))
5281 C_TYPE_FIELDS_READONLY (t) = 1;
5284 /* Any field that is volatile means variables of this type must be
5285 treated in some ways as volatile. */
5286 if (TREE_THIS_VOLATILE (x))
5287 C_TYPE_FIELDS_VOLATILE (t) = 1;
5289 /* Any field of nominal variable size implies structure is too. */
5290 if (C_DECL_VARIABLE_SIZE (x))
5291 C_TYPE_VARIABLE_SIZE (t) = 1;
5293 /* Detect invalid nested redefinition. */
5294 if (TREE_TYPE (x) == t)
5295 error ("nested redefinition of `%s'",
5296 IDENTIFIER_POINTER (TYPE_NAME (t)));
5298 /* Detect invalid bit-field size. */
5299 if (DECL_INITIAL (x))
5300 STRIP_NOPS (DECL_INITIAL (x));
5301 if (DECL_INITIAL (x))
5303 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5304 constant_expression_warning (DECL_INITIAL (x));
5308 "bit-field `%s' width not an integer constant");
5309 DECL_INITIAL (x) = NULL;
5313 /* Detect invalid bit-field type. */
5314 if (DECL_INITIAL (x)
5315 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5316 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5318 error_with_decl (x, "bit-field `%s' has invalid type");
5319 DECL_INITIAL (x) = NULL;
5322 if (DECL_INITIAL (x) && pedantic
5323 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5324 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5325 /* Accept an enum that's equivalent to int or unsigned int. */
5326 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5327 && (TYPE_PRECISION (TREE_TYPE (x))
5328 == TYPE_PRECISION (integer_type_node))))
5329 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5331 /* Detect and ignore out of range field width and process valid
5333 if (DECL_INITIAL (x))
5335 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5336 error_with_decl (x, "negative width in bit-field `%s'");
5337 else if (0 < compare_tree_int (DECL_INITIAL (x),
5338 TYPE_PRECISION (TREE_TYPE (x))))
5339 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5340 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5341 error_with_decl (x, "zero width for bit-field `%s'");
5344 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5345 unsigned HOST_WIDE_INT width
5346 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5348 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5349 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5350 TREE_UNSIGNED (TREE_TYPE (x)))
5352 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5353 TREE_UNSIGNED (TREE_TYPE (x))))))
5354 warning_with_decl (x,
5355 "`%s' is narrower than values of its type");
5357 DECL_SIZE (x) = bitsize_int (width);
5358 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5362 /* field size 0 => force desired amount of alignment. */
5363 #ifdef EMPTY_FIELD_BOUNDARY
5364 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5366 #ifdef PCC_BITFIELD_TYPE_MATTERS
5367 if (PCC_BITFIELD_TYPE_MATTERS)
5369 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5370 TYPE_ALIGN (TREE_TYPE (x)));
5371 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5378 else if (TREE_TYPE (x) != error_mark_node)
5380 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5381 : TYPE_ALIGN (TREE_TYPE (x)));
5383 /* Non-bit-fields are aligned for their type, except packed
5384 fields which require only BITS_PER_UNIT alignment. */
5385 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5386 if (! DECL_PACKED (x))
5387 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5390 DECL_INITIAL (x) = 0;
5393 /* Delete all duplicate fields from the fieldlist */
5394 for (x = fieldlist; x && TREE_CHAIN (x);)
5395 /* Anonymous fields aren't duplicates. */
5396 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5400 register tree y = fieldlist;
5404 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5410 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5412 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5413 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5415 else x = TREE_CHAIN (x);
5418 /* Now we have the nearly final fieldlist. Record it,
5419 then lay out the structure or union (including the fields). */
5421 TYPE_FIELDS (t) = fieldlist;
5425 /* Delete all zero-width bit-fields from the fieldlist */
5427 tree *fieldlistp = &fieldlist;
5429 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5430 *fieldlistp = TREE_CHAIN (*fieldlistp);
5432 fieldlistp = &TREE_CHAIN (*fieldlistp);
5435 /* Now we have the truly final field list.
5436 Store it in this type and in the variants. */
5438 TYPE_FIELDS (t) = fieldlist;
5440 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5442 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5443 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5444 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5445 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5448 /* If this was supposed to be a transparent union, but we can't
5449 make it one, warn and turn off the flag. */
5450 if (TREE_CODE (t) == UNION_TYPE
5451 && TYPE_TRANSPARENT_UNION (t)
5452 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5454 TYPE_TRANSPARENT_UNION (t) = 0;
5455 warning ("union cannot be made transparent");
5458 /* If this structure or union completes the type of any previous
5459 variable declaration, lay it out and output its rtl. */
5461 if (current_binding_level->n_incomplete != 0)
5464 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5466 if (TREE_TYPE (decl) == t
5467 && TREE_CODE (decl) != TYPE_DECL)
5469 layout_decl (decl, 0);
5470 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5471 maybe_objc_check_decl (decl);
5472 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5475 --current_binding_level->n_incomplete;
5477 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5478 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5480 tree element = TREE_TYPE (decl);
5481 while (TREE_CODE (element) == ARRAY_TYPE)
5482 element = TREE_TYPE (element);
5484 layout_array_type (TREE_TYPE (decl));
5489 /* Finish debugging output for this type. */
5490 rest_of_type_compilation (t, toplevel);
5495 /* Lay out the type T, and its element type, and so on. */
5498 layout_array_type (t)
5501 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5502 layout_array_type (TREE_TYPE (t));
5506 /* Begin compiling the definition of an enumeration type.
5507 NAME is its name (or null if anonymous).
5508 Returns the type object, as yet incomplete.
5509 Also records info about it so that build_enumerator
5510 may be used to declare the individual values as they are read. */
5516 register tree enumtype = 0;
5518 /* If this is the real definition for a previous forward reference,
5519 fill in the contents in the same object that used to be the
5520 forward reference. */
5523 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5525 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5527 enumtype = make_node (ENUMERAL_TYPE);
5528 pushtag (name, enumtype);
5531 C_TYPE_BEING_DEFINED (enumtype) = 1;
5533 if (TYPE_VALUES (enumtype) != 0)
5535 /* This enum is a named one that has been declared already. */
5536 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5538 /* Completely replace its old definition.
5539 The old enumerators remain defined, however. */
5540 TYPE_VALUES (enumtype) = 0;
5543 enum_next_value = integer_zero_node;
5546 if (flag_short_enums)
5547 TYPE_PACKED (enumtype) = 1;
5552 /* After processing and defining all the values of an enumeration type,
5553 install their decls in the enumeration type and finish it off.
5554 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5555 and ATTRIBUTES are the specified attributes.
5556 Returns ENUMTYPE. */
5559 finish_enum (enumtype, values, attributes)
5564 register tree pair, tem;
5565 tree minnode = 0, maxnode = 0, enum_value_type;
5566 int precision, unsign;
5567 int toplevel = (global_binding_level == current_binding_level);
5569 if (in_parm_level_p ())
5570 warning ("enum defined inside parms");
5572 decl_attributes (enumtype, attributes, NULL_TREE);
5574 /* Calculate the maximum value of any enumerator in this type. */
5576 if (values == error_mark_node)
5577 minnode = maxnode = integer_zero_node;
5580 minnode = maxnode = TREE_VALUE (values);
5581 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5583 tree value = TREE_VALUE (pair);
5584 if (tree_int_cst_lt (maxnode, value))
5586 if (tree_int_cst_lt (value, minnode))
5591 /* Construct the final type of this enumeration. It is the same
5592 as one of the integral types - the narrowest one that fits, except
5593 that normally we only go as narrow as int - and signed iff any of
5594 the values are negative. */
5595 unsign = (tree_int_cst_sgn (minnode) >= 0);
5596 precision = MAX (min_precision (minnode, unsign),
5597 min_precision (maxnode, unsign));
5598 if (!TYPE_PACKED (enumtype))
5599 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5600 if (type_for_size (precision, unsign) == 0)
5602 warning ("enumeration values exceed range of largest integer");
5603 precision = TYPE_PRECISION (long_long_integer_type_node);
5606 if (precision == TYPE_PRECISION (integer_type_node))
5607 enum_value_type = type_for_size (precision, 0);
5609 enum_value_type = enumtype;
5611 TYPE_MIN_VALUE (enumtype) = minnode;
5612 TYPE_MAX_VALUE (enumtype) = maxnode;
5613 TYPE_PRECISION (enumtype) = precision;
5614 TREE_UNSIGNED (enumtype) = unsign;
5615 TYPE_SIZE (enumtype) = 0;
5616 layout_type (enumtype);
5618 if (values != error_mark_node)
5620 /* Change the type of the enumerators to be the enum type. We
5621 need to do this irrespective of the size of the enum, for
5622 proper type checking. Replace the DECL_INITIALs of the
5623 enumerators, and the value slots of the list, with copies
5624 that have the enum type; they cannot be modified in place
5625 because they may be shared (e.g. integer_zero_node) Finally,
5626 change the purpose slots to point to the names of the decls. */
5627 for (pair = values; pair; pair = TREE_CHAIN (pair))
5629 tree enu = TREE_PURPOSE (pair);
5631 TREE_TYPE (enu) = enumtype;
5632 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5633 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5634 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5635 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5636 DECL_MODE (enu) = TYPE_MODE (enumtype);
5638 /* The ISO C Standard mandates enumerators to have type int,
5639 even though the underlying type of an enum type is
5640 unspecified. Here we convert any enumerators that fit in
5641 an int to type int, to avoid promotions to unsigned types
5642 when comparing integers with enumerators that fit in the
5643 int range. When -pedantic is given, build_enumerator()
5644 would have already taken care of those that don't fit. */
5645 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5646 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5648 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5650 TREE_PURPOSE (pair) = DECL_NAME (enu);
5651 TREE_VALUE (pair) = DECL_INITIAL (enu);
5654 TYPE_VALUES (enumtype) = values;
5657 /* Fix up all variant types of this enum type. */
5658 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5660 if (tem == enumtype)
5662 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5663 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5664 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5665 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5666 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5667 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5668 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5669 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5670 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5671 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5674 /* Finish debugging output for this type. */
5675 rest_of_type_compilation (enumtype, toplevel);
5680 /* Build and install a CONST_DECL for one value of the
5681 current enumeration type (one that was begun with start_enum).
5682 Return a tree-list containing the CONST_DECL and its value.
5683 Assignment of sequential values by default is handled here. */
5686 build_enumerator (name, value)
5689 register tree decl, type;
5691 /* Validate and default VALUE. */
5693 /* Remove no-op casts from the value. */
5695 STRIP_TYPE_NOPS (value);
5699 if (TREE_CODE (value) == INTEGER_CST)
5701 value = default_conversion (value);
5702 constant_expression_warning (value);
5706 error ("enumerator value for `%s' not integer constant",
5707 IDENTIFIER_POINTER (name));
5712 /* Default based on previous value. */
5713 /* It should no longer be possible to have NON_LVALUE_EXPR
5717 value = enum_next_value;
5719 error ("overflow in enumeration values");
5722 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5724 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5725 value = convert (integer_type_node, value);
5728 /* Set basis for default for next value. */
5729 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5730 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5732 /* Now create a declaration for the enum value name. */
5734 type = TREE_TYPE (value);
5735 type = type_for_size (MAX (TYPE_PRECISION (type),
5736 TYPE_PRECISION (integer_type_node)),
5738 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5739 && TREE_UNSIGNED (type)));
5741 decl = build_decl (CONST_DECL, name, type);
5742 DECL_INITIAL (decl) = convert (type, value);
5745 return tree_cons (decl, value, NULL_TREE);
5748 /* Create the FUNCTION_DECL for a function definition.
5749 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5750 the declaration; they describe the function's name and the type it returns,
5751 but twisted together in a fashion that parallels the syntax of C.
5753 This function creates a binding context for the function body
5754 as well as setting up the FUNCTION_DECL in current_function_decl.
5756 Returns 1 on success. If the DECLARATOR is not suitable for a function
5757 (it defines a datum instead), we return 0, which tells
5758 yyparse to report a parse error. */
5761 start_function (declspecs, declarator, prefix_attributes, attributes)
5762 tree declarator, declspecs, prefix_attributes, attributes;
5764 tree decl1, old_decl;
5766 int old_immediate_size_expand = immediate_size_expand;
5768 current_function_returns_value = 0; /* Assume, until we see it does. */
5769 current_function_returns_null = 0;
5770 warn_about_return_type = 0;
5771 current_extern_inline = 0;
5772 c_function_varargs = 0;
5774 shadowed_labels = 0;
5776 /* Don't expand any sizes in the return type of the function. */
5777 immediate_size_expand = 0;
5779 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5781 /* If the declarator is not suitable for a function definition,
5782 cause a syntax error. */
5785 immediate_size_expand = old_immediate_size_expand;
5789 decl_attributes (decl1, prefix_attributes, attributes);
5791 announce_function (decl1);
5793 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5795 error ("return type is an incomplete type");
5796 /* Make it return void instead. */
5798 = build_function_type (void_type_node,
5799 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5802 if (warn_about_return_type)
5803 pedwarn_c99 ("return type defaults to `int'");
5805 /* Save the parm names or decls from this function's declarator
5806 where store_parm_decls will find them. */
5807 current_function_parms = last_function_parms;
5808 current_function_parm_tags = last_function_parm_tags;
5810 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5811 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5812 DECL_INITIAL (decl1) = error_mark_node;
5814 /* If this definition isn't a prototype and we had a prototype declaration
5815 before, copy the arg type info from that prototype.
5816 But not if what we had before was a builtin function. */
5817 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5818 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5819 && !DECL_BUILT_IN (old_decl)
5820 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5821 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5822 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5824 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5825 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5826 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5829 /* If there is no explicit declaration, look for any out-of-scope implicit
5832 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5834 /* Optionally warn of old-fashioned def with no previous prototype. */
5835 if (warn_strict_prototypes
5836 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5837 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5838 warning ("function declaration isn't a prototype");
5839 /* Optionally warn of any global def with no previous prototype. */
5840 else if (warn_missing_prototypes
5841 && TREE_PUBLIC (decl1)
5842 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5843 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5844 warning_with_decl (decl1, "no previous prototype for `%s'");
5845 /* Optionally warn of any def with no previous prototype
5846 if the function has already been used. */
5847 else if (warn_missing_prototypes
5848 && old_decl != 0 && TREE_USED (old_decl)
5849 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5850 warning_with_decl (decl1,
5851 "`%s' was used with no prototype before its definition");
5852 /* Optionally warn of any global def with no previous declaration. */
5853 else if (warn_missing_declarations
5854 && TREE_PUBLIC (decl1)
5856 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5857 warning_with_decl (decl1, "no previous declaration for `%s'");
5858 /* Optionally warn of any def with no previous declaration
5859 if the function has already been used. */
5860 else if (warn_missing_declarations
5861 && old_decl != 0 && TREE_USED (old_decl)
5862 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5863 warning_with_decl (decl1,
5864 "`%s' was used with no declaration before its definition");
5866 /* This is a definition, not a reference.
5867 So normally clear DECL_EXTERNAL.
5868 However, `extern inline' acts like a declaration
5869 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5870 DECL_EXTERNAL (decl1) = current_extern_inline;
5872 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5873 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5876 /* This function exists in static storage.
5877 (This does not mean `static' in the C sense!) */
5878 TREE_STATIC (decl1) = 1;
5880 /* A nested function is not global. */
5881 if (current_function_decl != 0)
5882 TREE_PUBLIC (decl1) = 0;
5884 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5886 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5891 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5892 != integer_type_node)
5893 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5895 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5896 args = TREE_CHAIN (args))
5898 tree type = args ? TREE_VALUE (args) : 0;
5900 if (type == void_type_node)
5907 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5908 pedwarn_with_decl (decl1,
5909 "first argument of `%s' should be `int'");
5913 if (TREE_CODE (type) != POINTER_TYPE
5914 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5915 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5917 pedwarn_with_decl (decl1,
5918 "second argument of `%s' should be `char **'");
5922 if (TREE_CODE (type) != POINTER_TYPE
5923 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5924 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5926 pedwarn_with_decl (decl1,
5927 "third argument of `%s' should probably be `char **'");
5932 /* It is intentional that this message does not mention the third
5933 argument, which is warned for only pedantically, because it's
5934 blessed by mention in an appendix of the standard. */
5935 if (argct > 0 && (argct < 2 || argct > 3))
5936 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5938 if (argct == 3 && pedantic)
5939 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5941 if (! TREE_PUBLIC (decl1))
5942 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5945 /* Record the decl so that the function name is defined.
5946 If we already have a decl for this name, and it is a FUNCTION_DECL,
5947 use the old decl. */
5949 current_function_decl = pushdecl (decl1);
5952 declare_parm_level (1);
5953 current_binding_level->subblocks_tag_transparent = 1;
5955 make_function_rtl (current_function_decl);
5957 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5958 /* Promote the value to int before returning it. */
5959 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5961 /* It retains unsignedness if traditional
5962 or if not really getting wider. */
5963 if (TREE_UNSIGNED (restype)
5964 && (flag_traditional
5965 || (TYPE_PRECISION (restype)
5966 == TYPE_PRECISION (integer_type_node))))
5967 restype = unsigned_type_node;
5969 restype = integer_type_node;
5971 DECL_RESULT (current_function_decl)
5972 = build_decl (RESULT_DECL, NULL_TREE, restype);
5974 /* If this fcn was already referenced via a block-scope `extern' decl
5975 (or an implicit decl), propagate certain information about the usage. */
5976 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5977 TREE_ADDRESSABLE (current_function_decl) = 1;
5979 immediate_size_expand = old_immediate_size_expand;
5984 /* Record that this function is going to be a varargs function.
5985 This is called before store_parm_decls, which is too early
5986 to call mark_varargs directly. */
5991 c_function_varargs = 1;
5994 /* Store the parameter declarations into the current function declaration.
5995 This is called after parsing the parameter declarations, before
5996 digesting the body of the function.
5998 For an old-style definition, modify the function's type
5999 to specify at least the number of arguments. */
6004 register tree fndecl = current_function_decl;
6007 /* This is either a chain of PARM_DECLs (if a prototype was used)
6008 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6009 tree specparms = current_function_parms;
6011 /* This is a list of types declared among parms in a prototype. */
6012 tree parmtags = current_function_parm_tags;
6014 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6015 register tree parmdecls = getdecls ();
6017 /* This is a chain of any other decls that came in among the parm
6018 declarations. If a parm is declared with enum {foo, bar} x;
6019 then CONST_DECLs for foo and bar are put here. */
6022 /* Nonzero if this definition is written with a prototype. */
6025 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6027 /* This case is when the function was defined with an ANSI prototype.
6028 The parms already have decls, so we need not do anything here
6029 except record them as in effect
6030 and complain if any redundant old-style parm decls were written. */
6041 error_with_decl (fndecl,
6042 "parm types given both in parmlist and separately");
6043 /* Get rid of the erroneous decls; don't keep them on
6044 the list of parms, since they might not be PARM_DECLs. */
6045 for (decl = current_binding_level->names;
6046 decl; decl = TREE_CHAIN (decl))
6047 if (DECL_NAME (decl))
6048 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6049 for (link = current_binding_level->shadowed;
6050 link; link = TREE_CHAIN (link))
6051 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6052 current_binding_level->names = 0;
6053 current_binding_level->shadowed = 0;
6056 specparms = nreverse (specparms);
6057 for (parm = specparms; parm; parm = next)
6059 next = TREE_CHAIN (parm);
6060 if (TREE_CODE (parm) == PARM_DECL)
6062 if (DECL_NAME (parm) == 0)
6063 error_with_decl (parm, "parameter name omitted");
6064 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6065 && VOID_TYPE_P (TREE_TYPE (parm)))
6067 error_with_decl (parm, "parameter `%s' declared void");
6068 /* Change the type to error_mark_node so this parameter
6069 will be ignored by assign_parms. */
6070 TREE_TYPE (parm) = error_mark_node;
6076 /* If we find an enum constant or a type tag,
6077 put it aside for the moment. */
6078 TREE_CHAIN (parm) = 0;
6079 others = chainon (others, parm);
6083 /* Get the decls in their original chain order
6084 and record in the function. */
6085 DECL_ARGUMENTS (fndecl) = getdecls ();
6088 /* If this function takes a variable number of arguments,
6089 add a phony parameter to the end of the parm list,
6090 to represent the position of the first unnamed argument. */
6091 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6094 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6095 /* Let's hope the address of the unnamed parm
6096 won't depend on its type. */
6097 TREE_TYPE (dummy) = integer_type_node;
6098 DECL_ARG_TYPE (dummy) = integer_type_node;
6099 DECL_ARGUMENTS (fndecl)
6100 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6104 /* Now pushdecl the enum constants. */
6105 for (parm = others; parm; parm = next)
6107 next = TREE_CHAIN (parm);
6108 if (DECL_NAME (parm) == 0)
6110 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6112 else if (TREE_CODE (parm) != PARM_DECL)
6116 storetags (chainon (parmtags, gettags ()));
6120 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6121 each with a parm name as the TREE_VALUE.
6123 PARMDECLS is a chain of declarations for parameters.
6124 Warning! It can also contain CONST_DECLs which are not parameters
6125 but are names of enumerators of any enum types
6126 declared among the parameters.
6128 First match each formal parameter name with its declaration.
6129 Associate decls with the names and store the decls
6130 into the TREE_PURPOSE slots. */
6132 /* We use DECL_WEAK as a flag to show which parameters have been
6133 seen already since it is not used on PARM_DECL or CONST_DECL. */
6134 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6135 DECL_WEAK (parm) = 0;
6137 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6139 register tree tail, found = NULL;
6141 if (TREE_VALUE (parm) == 0)
6143 error_with_decl (fndecl,
6144 "parameter name missing from parameter list");
6145 TREE_PURPOSE (parm) = 0;
6149 /* See if any of the parmdecls specifies this parm by name.
6150 Ignore any enumerator decls. */
6151 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6152 if (DECL_NAME (tail) == TREE_VALUE (parm)
6153 && TREE_CODE (tail) == PARM_DECL)
6159 /* If declaration already marked, we have a duplicate name.
6160 Complain, and don't use this decl twice. */
6161 if (found && DECL_WEAK (found))
6163 error_with_decl (found, "multiple parameters named `%s'");
6167 /* If the declaration says "void", complain and ignore it. */
6168 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6170 error_with_decl (found, "parameter `%s' declared void");
6171 TREE_TYPE (found) = integer_type_node;
6172 DECL_ARG_TYPE (found) = integer_type_node;
6173 layout_decl (found, 0);
6176 /* Traditionally, a parm declared float is actually a double. */
6177 if (found && flag_traditional
6178 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6180 TREE_TYPE (found) = double_type_node;
6181 DECL_ARG_TYPE (found) = double_type_node;
6182 layout_decl (found, 0);
6185 /* If no declaration found, default to int. */
6188 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6190 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6191 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6192 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6194 warning_with_decl (found, "type of `%s' defaults to `int'");
6198 TREE_PURPOSE (parm) = found;
6200 /* Mark this decl as "already found" */
6201 DECL_WEAK (found) = 1;
6204 /* Put anything which is on the parmdecls chain and which is
6205 not a PARM_DECL onto the list NONPARMS. (The types of
6206 non-parm things which might appear on the list include
6207 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6208 any actual PARM_DECLs not matched with any names. */
6211 for (parm = parmdecls; parm; )
6213 tree next = TREE_CHAIN (parm);
6214 TREE_CHAIN (parm) = 0;
6216 if (TREE_CODE (parm) != PARM_DECL)
6217 nonparms = chainon (nonparms, parm);
6220 /* Complain about args with incomplete types. */
6221 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6223 error_with_decl (parm, "parameter `%s' has incomplete type");
6224 TREE_TYPE (parm) = error_mark_node;
6227 if (! DECL_WEAK (parm))
6229 error_with_decl (parm,
6230 "declaration for parameter `%s' but no such parameter");
6231 /* Pretend the parameter was not missing.
6232 This gets us to a standard state and minimizes
6233 further error messages. */
6235 = chainon (specparms,
6236 tree_cons (parm, NULL_TREE, NULL_TREE));
6243 /* Chain the declarations together in the order of the list of names. */
6244 /* Store that chain in the function decl, replacing the list of names. */
6246 DECL_ARGUMENTS (fndecl) = 0;
6249 for (last = 0; parm; parm = TREE_CHAIN (parm))
6250 if (TREE_PURPOSE (parm))
6253 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6255 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6256 last = TREE_PURPOSE (parm);
6257 TREE_CHAIN (last) = 0;
6261 /* If there was a previous prototype,
6262 set the DECL_ARG_TYPE of each argument according to
6263 the type previously specified, and report any mismatches. */
6265 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6268 for (parm = DECL_ARGUMENTS (fndecl),
6269 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6270 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6271 != void_type_node));
6272 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6274 if (parm == 0 || type == 0
6275 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6277 error ("number of arguments doesn't match prototype");
6278 error_with_file_and_line (current_function_prototype_file,
6279 current_function_prototype_line,
6280 "prototype declaration");
6283 /* Type for passing arg must be consistent
6284 with that declared for the arg. */
6285 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6287 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6288 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6290 /* Adjust argument to match prototype. E.g. a previous
6291 `int foo(float);' prototype causes
6292 `int foo(x) float x; {...}' to be treated like
6293 `int foo(float x) {...}'. This is particularly
6294 useful for argument types like uid_t. */
6295 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6297 if (PROMOTE_PROTOTYPES
6298 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6299 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6300 && TYPE_PRECISION (TREE_TYPE (parm))
6301 < TYPE_PRECISION (integer_type_node))
6302 DECL_ARG_TYPE (parm) = integer_type_node;
6306 pedwarn ("promoted argument `%s' doesn't match prototype",
6307 IDENTIFIER_POINTER (DECL_NAME (parm)));
6308 warning_with_file_and_line
6309 (current_function_prototype_file,
6310 current_function_prototype_line,
6311 "prototype declaration");
6314 /* If -traditional, allow `int' argument to match
6315 `unsigned' prototype. */
6316 else if (! (flag_traditional
6317 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6318 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6320 error ("argument `%s' doesn't match prototype",
6321 IDENTIFIER_POINTER (DECL_NAME (parm)));
6322 error_with_file_and_line (current_function_prototype_file,
6323 current_function_prototype_line,
6324 "prototype declaration");
6328 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6331 /* Otherwise, create a prototype that would match. */
6335 tree actual = 0, last = 0, type;
6337 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6339 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6341 TREE_CHAIN (last) = type;
6346 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6348 TREE_CHAIN (last) = type;
6352 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6353 of the type of this function, but we need to avoid having this
6354 affect the types of other similarly-typed functions, so we must
6355 first force the generation of an identical (but separate) type
6356 node for the relevant function type. The new node we create
6357 will be a variant of the main variant of the original function
6360 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6362 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6365 /* Now store the final chain of decls for the arguments
6366 as the decl-chain of the current lexical scope.
6367 Put the enumerators in as well, at the front so that
6368 DECL_ARGUMENTS is not modified. */
6370 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6373 /* Make sure the binding level for the top of the function body
6374 gets a BLOCK if there are any in the function.
6375 Otherwise, the dbx output is wrong. */
6377 keep_next_if_subblocks = 1;
6379 /* ??? This might be an improvement,
6380 but needs to be thought about some more. */
6382 keep_next_level_flag = 1;
6385 /* Write a record describing this function definition to the prototypes
6386 file (if requested). */
6388 gen_aux_info_record (fndecl, 1, 0, prototype);
6390 /* Initialize the RTL code for the function. */
6392 init_function_start (fndecl, input_filename, lineno);
6394 /* If this is a varargs function, inform function.c. */
6396 if (c_function_varargs)
6399 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6401 declare_function_name ();
6403 /* Set up parameters and prepare for return, for the function. */
6405 expand_function_start (fndecl, 0);
6407 /* If this function is `main', emit a call to `__main'
6408 to run global initializers, etc. */
6409 if (DECL_NAME (fndecl)
6410 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6411 && DECL_CONTEXT (fndecl) == NULL_TREE)
6412 expand_main_function ();
6415 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6416 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6417 stands for an ellipsis in the identifier list.
6419 PARMLIST is the data returned by get_parm_info for the
6420 parmlist that follows the semicolon.
6422 We return a value of the same sort that get_parm_info returns,
6423 except that it describes the combination of identifiers and parmlist. */
6426 combine_parm_decls (specparms, parmlist, void_at_end)
6427 tree specparms, parmlist;
6430 register tree fndecl = current_function_decl;
6433 tree parmdecls = TREE_PURPOSE (parmlist);
6435 /* This is a chain of any other decls that came in among the parm
6436 declarations. They were separated already by get_parm_info,
6437 so we just need to keep them separate. */
6438 tree nonparms = TREE_VALUE (parmlist);
6442 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6443 DECL_WEAK (parm) = 0;
6445 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6447 register tree tail, found = NULL;
6449 /* See if any of the parmdecls specifies this parm by name. */
6450 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6451 if (DECL_NAME (tail) == TREE_VALUE (parm))
6457 /* If declaration already marked, we have a duplicate name.
6458 Complain, and don't use this decl twice. */
6459 if (found && DECL_WEAK (found))
6461 error_with_decl (found, "multiple parameters named `%s'");
6465 /* If the declaration says "void", complain and ignore it. */
6466 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6468 error_with_decl (found, "parameter `%s' declared void");
6469 TREE_TYPE (found) = integer_type_node;
6470 DECL_ARG_TYPE (found) = integer_type_node;
6471 layout_decl (found, 0);
6474 /* Traditionally, a parm declared float is actually a double. */
6475 if (found && flag_traditional
6476 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6478 TREE_TYPE (found) = double_type_node;
6479 DECL_ARG_TYPE (found) = double_type_node;
6480 layout_decl (found, 0);
6483 /* If no declaration found, default to int. */
6486 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6488 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6489 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6490 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6491 error_with_decl (found, "type of parameter `%s' is not declared");
6495 TREE_PURPOSE (parm) = found;
6497 /* Mark this decl as "already found". */
6498 DECL_WEAK (found) = 1;
6501 /* Complain about any actual PARM_DECLs not matched with any names. */
6503 for (parm = parmdecls; parm; )
6505 tree next = TREE_CHAIN (parm);
6506 TREE_CHAIN (parm) = 0;
6508 /* Complain about args with incomplete types. */
6509 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6511 error_with_decl (parm, "parameter `%s' has incomplete type");
6512 TREE_TYPE (parm) = error_mark_node;
6515 if (! DECL_WEAK (parm))
6517 error_with_decl (parm,
6518 "declaration for parameter `%s' but no such parameter");
6519 /* Pretend the parameter was not missing.
6520 This gets us to a standard state and minimizes
6521 further error messages. */
6523 = chainon (specparms,
6524 tree_cons (parm, NULL_TREE, NULL_TREE));
6530 /* Chain the declarations together in the order of the list of names.
6531 At the same time, build up a list of their types, in reverse order. */
6537 for (last = 0; parm; parm = TREE_CHAIN (parm))
6538 if (TREE_PURPOSE (parm))
6541 parmdecls = TREE_PURPOSE (parm);
6543 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6544 last = TREE_PURPOSE (parm);
6545 TREE_CHAIN (last) = 0;
6547 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6552 return tree_cons (parmdecls, nonparms,
6553 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6555 return tree_cons (parmdecls, nonparms, nreverse (types));
6558 /* Finish up a function declaration and compile that function
6559 all the way to assembler language output. The free the storage
6560 for the function definition.
6562 This is called after parsing the body of the function definition.
6564 NESTED is nonzero if the function being finished is nested in another. */
6567 finish_function (nested)
6570 register tree fndecl = current_function_decl;
6572 /* TREE_READONLY (fndecl) = 1;
6573 This caused &foo to be of type ptr-to-const-function
6574 which then got a warning when stored in a ptr-to-function variable. */
6577 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6579 /* Must mark the RESULT_DECL as being in this function. */
6581 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6583 /* Obey `register' declarations if `setjmp' is called in this fn. */
6584 if (flag_traditional && current_function_calls_setjmp)
6586 setjmp_protect (DECL_INITIAL (fndecl));
6587 setjmp_protect_args ();
6590 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6592 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6593 != integer_type_node)
6595 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6596 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6598 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6602 #ifdef DEFAULT_MAIN_RETURN
6603 /* Make it so that `main' always returns success by default. */
6604 DEFAULT_MAIN_RETURN;
6609 /* Generate rtl for function exit. */
6610 expand_function_end (input_filename, lineno, 0);
6612 /* So we can tell if jump_optimize sets it to 1. */
6615 /* If this is a nested function, protect the local variables in the stack
6616 above us from being collected while we're compiling this function. */
6618 ggc_push_context ();
6620 /* Run the optimizers and output the assembler code for this function. */
6621 rest_of_compilation (fndecl);
6623 /* Undo the GC context switch. */
6627 current_function_returns_null |= can_reach_end;
6629 if (warn_missing_noreturn
6630 && !TREE_THIS_VOLATILE (fndecl)
6631 && !current_function_returns_null
6632 && !current_function_returns_value)
6633 warning ("function might be possible candidate for attribute `noreturn'");
6635 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6636 warning ("`noreturn' function does return");
6637 else if (warn_return_type && can_reach_end
6638 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6639 /* If this function returns non-void and control can drop through,
6641 warning ("control reaches end of non-void function");
6642 /* With just -W, complain only if function returns both with
6643 and without a value. */
6644 else if (extra_warnings
6645 && current_function_returns_value && current_function_returns_null)
6646 warning ("this function may return with or without a value");
6648 /* If requested, warn about function definitions where the function will
6649 return a value (usually of some struct or union type) which itself will
6650 take up a lot of stack space. */
6652 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6654 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6656 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6657 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6660 unsigned int size_as_int
6661 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6663 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6664 warning_with_decl (fndecl,
6665 "size of return value of `%s' is %u bytes",
6668 warning_with_decl (fndecl,
6669 "size of return value of `%s' is larger than %d bytes",
6674 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6676 /* Stop pointing to the local nodes about to be freed.
6677 But DECL_INITIAL must remain nonzero so we know this
6678 was an actual function definition.
6679 For a nested function, this is done in pop_c_function_context.
6680 If rest_of_compilation set this to 0, leave it 0. */
6681 if (DECL_INITIAL (fndecl) != 0)
6682 DECL_INITIAL (fndecl) = error_mark_node;
6684 DECL_ARGUMENTS (fndecl) = 0;
6687 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6689 #ifndef ASM_OUTPUT_CONSTRUCTOR
6690 if (! flag_gnu_linker)
6691 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6694 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6697 if (DECL_STATIC_DESTRUCTOR (fndecl))
6699 #ifndef ASM_OUTPUT_DESTRUCTOR
6700 if (! flag_gnu_linker)
6701 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6704 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6709 /* Let the error reporting routines know that we're outside a
6710 function. For a nested function, this value is used in
6711 pop_c_function_context and then reset via pop_function_context. */
6712 current_function_decl = NULL;
6716 /* Save and restore the variables in this file and elsewhere
6717 that keep track of the progress of compilation of the current function.
6718 Used for nested functions. */
6720 struct language_function
6723 tree shadowed_labels;
6726 int warn_about_return_type;
6728 struct binding_level *binding_level;
6731 /* Save and reinitialize the variables
6732 used during compilation of a C function. */
6735 push_c_function_context (f)
6738 struct language_function *p;
6739 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6742 p->named_labels = named_labels;
6743 p->shadowed_labels = shadowed_labels;
6744 p->returns_value = current_function_returns_value;
6745 p->returns_null = current_function_returns_null;
6746 p->warn_about_return_type = warn_about_return_type;
6747 p->extern_inline = current_extern_inline;
6748 p->binding_level = current_binding_level;
6751 /* Restore the variables used during compilation of a C function. */
6754 pop_c_function_context (f)
6757 struct language_function *p = f->language;
6760 /* Bring back all the labels that were shadowed. */
6761 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6762 if (DECL_NAME (TREE_VALUE (link)) != 0)
6763 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6764 = TREE_VALUE (link);
6766 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6768 /* Stop pointing to the local nodes about to be freed. */
6769 /* But DECL_INITIAL must remain nonzero so we know this
6770 was an actual function definition. */
6771 DECL_INITIAL (current_function_decl) = error_mark_node;
6772 DECL_ARGUMENTS (current_function_decl) = 0;
6775 named_labels = p->named_labels;
6776 shadowed_labels = p->shadowed_labels;
6777 current_function_returns_value = p->returns_value;
6778 current_function_returns_null = p->returns_null;
6779 warn_about_return_type = p->warn_about_return_type;
6780 current_extern_inline = p->extern_inline;
6781 current_binding_level = p->binding_level;
6787 /* Mark the language specific parts of F for GC. */
6789 mark_c_function_context (f)
6792 struct language_function *p = f->language;
6797 ggc_mark_tree (p->shadowed_labels);
6798 ggc_mark_tree (p->named_labels);
6799 mark_binding_level (&p->binding_level);
6802 /* integrate_decl_tree calls this function, but since we don't use the
6803 DECL_LANG_SPECIFIC field, this is a no-op. */
6806 copy_lang_decl (node)
6807 tree node ATTRIBUTE_UNUSED;
6811 /* Mark ARG for GC. */
6813 lang_mark_false_label_stack (arg)
6814 struct label_node *arg;
6816 /* C doesn't use false_label_stack. It better be NULL. */
6821 /* Mark the language specific bits in T for GC. */
6826 if (TREE_CODE (t) == IDENTIFIER_NODE)
6828 struct lang_identifier *i = (struct lang_identifier *) t;
6829 ggc_mark_tree (i->global_value);
6830 ggc_mark_tree (i->local_value);
6831 ggc_mark_tree (i->label_value);
6832 ggc_mark_tree (i->implicit_decl);
6833 ggc_mark_tree (i->error_locus);
6834 ggc_mark_tree (i->limbo_value);
6836 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6837 ggc_mark (TYPE_LANG_SPECIFIC (t));
6840 /* The functions below are required for functionality of doing
6841 function at once processing in the C front end. Currently these
6842 functions are not called from anywhere in the C front end, but as
6843 these changes continue, that will change. */
6845 /* Returns non-zero if the current statement is a full expression,
6846 i.e. temporaries created during that statement should be destroyed
6847 at the end of the statement. */
6850 stmts_are_full_exprs_p ()
6855 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6859 anon_aggr_type_p (node)
6860 tree node ATTRIBUTE_UNUSED;
6865 /* One if we have already declared __FUNCTION__ (and related
6866 variables) in the current function. Two if we are in the process
6870 current_function_name_declared ()
6876 /* Code to generate the RTL for a case label in C. */
6879 do_case (low_value, high_value)
6883 tree value1 = NULL_TREE, value2 = NULL_TREE, label;
6885 if (low_value != NULL_TREE)
6886 value1 = check_case_value (low_value);
6887 if (high_value != NULL_TREE)
6888 value2 = check_case_value (high_value);
6890 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
6892 if (pedantic && (high_value != NULL_TREE))
6893 pedwarn ("ANSI C forbids case ranges");
6895 if (value1 != error_mark_node && value2 != error_mark_node)
6900 if (high_value == NULL_TREE && value1 != NULL_TREE &&
6901 pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value1)))
6902 pedwarn ("label must have integral type in ANSI C");
6904 if (low_value == NULL_TREE)
6905 success = pushcase (NULL_TREE, 0, label, &duplicate);
6906 else if (high_value == NULL_TREE)
6907 success = pushcase (value1, convert_and_check, label,
6910 success = pushcase_range (value1, value2, convert_and_check,
6915 if (low_value == NULL_TREE)
6916 error ("default label not within a switch statement");
6918 error ("case label not within a switch statement");
6920 else if (success == 2) {
6921 if (low_value == NULL_TREE)
6923 error ("multiple default labels in one switch");
6924 error_with_decl (duplicate, "this is the first default label");
6927 error ("dupicate case value");
6928 if (high_value != NULL_TREE)
6929 error_with_decl (duplicate, "this is the first entry for that value");
6931 else if (low_value != NULL_TREE)
6934 warning ("case value out of range");
6935 else if (success == 5)
6936 error ("case label within scope of cleanup or variable array");
6941 /* Language specific handler of tree nodes used when generating RTL
6945 lang_expand_stmt (t)
6946 tree t ATTRIBUTE_UNUSED;
6952 /* Accessor to set the 'current_function_name_declared' flag. */
6955 set_current_function_name_declared (i)
6956 int i ATTRIBUTE_UNUSED;