1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
49 { NORMAL, /* Ordinary declaration */
50 FUNCDEF, /* Function definition */
51 PARM, /* Declaration of parm before function body */
52 FIELD, /* Declaration inside struct or union */
53 BITFIELD, /* Likewise but with specified width */
54 TYPENAME}; /* Typename (inside cast or sizeof) */
57 /* Nonzero if we have seen an invalid cross reference
58 to a struct, union, or enum, but not yet printed the message. */
60 tree pending_invalid_xref;
61 /* File and line to appear in the eventual error message. */
62 const char *pending_invalid_xref_file;
63 int pending_invalid_xref_line;
65 /* While defining an enum type, this is 1 plus the last enumerator
66 constant value. Note that will do not have to save this or `enum_overflow'
67 around nested function definition since such a definition could only
68 occur in an enum value expression and we don't use these variables in
71 static tree enum_next_value;
73 /* Nonzero means that there was overflow computing enum_next_value. */
75 static int enum_overflow;
77 /* Parsing a function declarator leaves a list of parameter names
78 or a chain or parameter decls here. */
80 static tree last_function_parms;
82 /* Parsing a function declarator leaves here a chain of structure
83 and enum types declared in the parmlist. */
85 static tree last_function_parm_tags;
87 /* After parsing the declarator that starts a function definition,
88 `start_function' puts here the list of parameter names or chain of decls.
89 `store_parm_decls' finds it here. */
91 static tree current_function_parms;
93 /* Similar, for last_function_parm_tags. */
94 static tree current_function_parm_tags;
96 /* Similar, for the file and line that the prototype came from if this is
97 an old-style definition. */
98 static const char *current_function_prototype_file;
99 static int current_function_prototype_line;
101 /* The current statement tree. */
103 static struct stmt_tree_s c_stmt_tree;
105 /* The current scope statement stack. */
107 static tree c_scope_stmt_stack;
109 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
110 that have names. Here so we can clear out their names' definitions
111 at the end of the function. */
113 static tree named_labels;
115 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
117 static tree shadowed_labels;
119 /* Nonzero when store_parm_decls is called indicates a varargs function.
120 Value not meaningful after store_parm_decls. */
122 static int c_function_varargs;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to nonzero by `grokdeclarator' for a function
135 whose return type is defaulted, if warnings for this are desired. */
137 static int warn_about_return_type;
139 /* Nonzero when starting a function declared `extern inline'. */
141 static int current_extern_inline;
143 /* For each binding contour we allocate a binding_level structure
144 * which records the names defined in that contour.
147 * 1) one for each function definition,
148 * where internal declarations of the parameters appear.
149 * 2) one for each compound statement,
150 * to record its declarations.
152 * The current meaning of a name can be found by searching the levels from
153 * the current one out to the global one.
156 /* Note that the information in the `names' component of the global contour
157 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
161 /* A chain of _DECL nodes for all variables, constants, functions,
162 and typedef types. These are in the reverse of the order supplied.
166 /* A list of structure, union and enum definitions,
167 * for looking up tag names.
168 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
169 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
170 * or ENUMERAL_TYPE node.
174 /* For each level, a list of shadowed outer-level local definitions
175 to be restored when this level is popped.
176 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
177 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
180 /* For each level (except not the global one),
181 a chain of BLOCK nodes for all the levels
182 that were entered and exited one level down. */
185 /* The BLOCK node for this level, if one has been preallocated.
186 If 0, the BLOCK is allocated (if needed) when the level is popped. */
189 /* The binding level which this one is contained in (inherits from). */
190 struct binding_level *level_chain;
192 /* Nonzero for the level that holds the parameters of a function. */
195 /* Nonzero if this level "doesn't exist" for tags. */
196 char tag_transparent;
198 /* Nonzero if sublevels of this level "don't exist" for tags.
199 This is set in the parm level of a function definition
200 while reading the function body, so that the outermost block
201 of the function body will be tag-transparent. */
202 char subblocks_tag_transparent;
204 /* Nonzero means make a BLOCK for this level regardless of all else. */
207 /* Nonzero means make a BLOCK if this level has any subblocks. */
208 char keep_if_subblocks;
210 /* Number of decls in `names' that have incomplete
211 structure or union types. */
214 /* A list of decls giving the (reversed) specified order of parms,
215 not including any forward-decls in the parmlist.
216 This is so we can put the parms in proper order for assign_parms. */
220 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
222 /* The binding level currently in effect. */
224 static struct binding_level *current_binding_level;
226 /* A chain of binding_level structures awaiting reuse. */
228 static struct binding_level *free_binding_level;
230 /* The outermost binding level, for names of file scope.
231 This is created when the compiler is started and exists
232 through the entire run. */
234 static struct binding_level *global_binding_level;
236 /* Binding level structures are initialized by copying this one. */
238 static struct binding_level clear_binding_level
239 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
242 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
244 static int keep_next_level_flag;
246 /* Nonzero means make a BLOCK for the next level pushed
247 if it has subblocks. */
249 static int keep_next_if_subblocks;
251 /* The chain of outer levels of label scopes.
252 This uses the same data structure used for binding levels,
253 but it works differently: each link in the chain records
254 saved values of named_labels and shadowed_labels for
255 a label binding level outside the current one. */
257 static struct binding_level *label_level_chain;
259 /* Functions called automatically at the beginning and end of execution. */
261 tree static_ctors, static_dtors;
263 /* Forward declarations. */
265 static struct binding_level * make_binding_level PARAMS ((void));
266 static void mark_binding_level PARAMS ((void *));
267 static void clear_limbo_values PARAMS ((tree));
268 static int duplicate_decls PARAMS ((tree, tree, int));
269 static int redeclaration_error_message PARAMS ((tree, tree));
270 static void storedecls PARAMS ((tree));
271 static void storetags PARAMS ((tree));
272 static tree lookup_tag PARAMS ((enum tree_code, tree,
273 struct binding_level *, int));
274 static tree lookup_tag_reverse PARAMS ((tree));
275 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
277 static tree grokparms PARAMS ((tree, int));
278 static void layout_array_type PARAMS ((tree));
279 static tree c_make_fname_decl PARAMS ((tree, int));
280 static void c_expand_body PARAMS ((tree, int));
282 /* C-specific option variables. */
284 /* Nonzero means allow type mismatches in conditional expressions;
285 just make their values `void'. */
287 int flag_cond_mismatch;
289 /* Nonzero means don't recognize the keyword `asm'. */
293 /* Nonzero means do some things the same way PCC does. */
295 int flag_traditional;
297 /* Nonzero means enable C89 Amendment 1 features. */
301 /* Nonzero means use the ISO C99 dialect of C. */
305 /* Nonzero means that we have builtin functions, and main is an int */
309 /* Nonzero means add default format_arg attributes for functions not
312 int flag_noniso_default_format_attributes = 1;
314 /* Nonzero means to allow single precision math even if we're generally
315 being traditional. */
316 int flag_allow_single_precision = 0;
318 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
320 int flag_signed_bitfields = 1;
321 int explicit_flag_signed_bitfields = 0;
323 /* Nonzero means warn about use of implicit int. */
325 int warn_implicit_int;
327 /* Nonzero means warn about usage of long long when `-pedantic'. */
329 int warn_long_long = 1;
331 /* Nonzero means message about use of implicit function declarations;
332 1 means warning; 2 means error. */
334 int mesg_implicit_function_declaration = -1;
336 /* Nonzero means give string constants the type `const char *'
337 to get extra warnings from them. These warnings will be too numerous
338 to be useful, except in thoroughly ANSIfied programs. */
340 int flag_const_strings;
342 /* Nonzero means warn about pointer casts that can drop a type qualifier
343 from the pointer target type. */
347 /* Nonzero means warn when casting a function call to a type that does
348 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
349 when there is no previous declaration of sqrt or malloc. */
351 int warn_bad_function_cast;
353 /* Warn about functions which might be candidates for format attributes. */
355 int warn_missing_format_attribute;
357 /* Warn about traditional constructs whose meanings changed in ANSI C. */
359 int warn_traditional;
361 /* Nonzero means warn about sizeof(function) or addition/subtraction
362 of function pointers. */
364 int warn_pointer_arith;
366 /* Nonzero means warn for non-prototype function decls
367 or non-prototyped defs without previous prototype. */
369 int warn_strict_prototypes;
371 /* Nonzero means warn for any global function def
372 without separate previous prototype decl. */
374 int warn_missing_prototypes;
376 /* Nonzero means warn for any global function def
377 without separate previous decl. */
379 int warn_missing_declarations;
381 /* Nonzero means warn about multiple (redundant) decls for the same single
382 variable or function. */
384 int warn_redundant_decls = 0;
386 /* Nonzero means warn about extern declarations of objects not at
387 file-scope level and about *all* declarations of functions (whether
388 extern or static) not at file-scope level. Note that we exclude
389 implicit function declarations. To get warnings about those, use
392 int warn_nested_externs = 0;
394 /* Warn about a subscript that has type char. */
396 int warn_char_subscripts = 0;
398 /* Warn if a type conversion is done that might have confusing results. */
402 /* Warn if adding () is suggested. */
404 int warn_parentheses;
406 /* Warn if initializer is not completely bracketed. */
408 int warn_missing_braces;
410 /* Warn if main is suspicious. */
414 /* Warn about #pragma directives that are not recognised. */
416 int warn_unknown_pragmas = 0; /* Tri state variable. */
418 /* Warn about comparison of signed and unsigned values.
419 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
421 int warn_sign_compare = -1;
423 /* Warn about testing equality of floating point numbers. */
425 int warn_float_equal = 0;
427 /* Nonzero means warn about use of multicharacter literals. */
429 int warn_multichar = 1;
431 /* The variant of the C language being processed. */
433 c_language_kind c_language = clk_c;
435 /* Nonzero means `$' can be in an identifier. */
437 #ifndef DOLLARS_IN_IDENTIFIERS
438 #define DOLLARS_IN_IDENTIFIERS 1
440 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
442 /* Decode the string P as a language-specific option for C.
443 Return the number of strings consumed. Should not complain
444 if it does not recognise the option. */
447 c_decode_option (argc, argv)
448 int argc ATTRIBUTE_UNUSED;
451 int strings_processed;
454 strings_processed = cpp_handle_option (parse_in, argc, argv);
456 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
458 flag_traditional = 1;
459 flag_writable_strings = 1;
461 else if (!strcmp (p, "-fallow-single-precision"))
462 flag_allow_single_precision = 1;
463 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
468 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
472 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
476 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
478 flag_traditional = 0;
479 flag_writable_strings = 0;
481 else if (!strncmp (p, "-std=", 5))
483 /* Select the appropriate language standard. We currently
485 -std=iso9899:1990 same as -ansi
486 -std=iso9899:199409 ISO C as modified in amend. 1
487 -std=iso9899:1999 ISO C 99
488 -std=c89 same as -std=iso9899:1990
489 -std=c99 same as -std=iso9899:1999
490 -std=gnu89 default, iso9899:1990 + gnu extensions
491 -std=gnu99 iso9899:1999 + gnu extensions
493 const char *const argstart = &p[5];
495 if (!strcmp (argstart, "iso9899:1990")
496 || !strcmp (argstart, "c89"))
501 flag_traditional = 0;
502 flag_writable_strings = 0;
504 flag_no_nonansi_builtin = 1;
505 flag_noniso_default_format_attributes = 0;
508 else if (!strcmp (argstart, "iso9899:199409"))
513 else if (!strcmp (argstart, "iso9899:199x")
514 || !strcmp (argstart, "iso9899:1999")
515 || !strcmp (argstart, "c9x")
516 || !strcmp (argstart, "c99"))
518 flag_traditional = 0;
519 flag_writable_strings = 0;
521 flag_no_nonansi_builtin = 1;
522 flag_noniso_default_format_attributes = 0;
526 else if (!strcmp (argstart, "gnu89"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
531 flag_no_nonansi_builtin = 0;
532 flag_noniso_default_format_attributes = 1;
536 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
538 flag_traditional = 0;
539 flag_writable_strings = 0;
541 flag_no_nonansi_builtin = 0;
542 flag_noniso_default_format_attributes = 1;
547 error ("unknown C standard `%s'", argstart);
549 else if (!strcmp (p, "-fdollars-in-identifiers"))
550 dollars_in_ident = 1;
551 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
552 dollars_in_ident = 0;
553 else if (!strcmp (p, "-fsigned-char"))
554 flag_signed_char = 1;
555 else if (!strcmp (p, "-funsigned-char"))
556 flag_signed_char = 0;
557 else if (!strcmp (p, "-fno-signed-char"))
558 flag_signed_char = 0;
559 else if (!strcmp (p, "-fno-unsigned-char"))
560 flag_signed_char = 1;
561 else if (!strcmp (p, "-fsigned-bitfields")
562 || !strcmp (p, "-fno-unsigned-bitfields"))
564 flag_signed_bitfields = 1;
565 explicit_flag_signed_bitfields = 1;
567 else if (!strcmp (p, "-funsigned-bitfields")
568 || !strcmp (p, "-fno-signed-bitfields"))
570 flag_signed_bitfields = 0;
571 explicit_flag_signed_bitfields = 1;
573 else if (!strcmp (p, "-fshort-enums"))
574 flag_short_enums = 1;
575 else if (!strcmp (p, "-fno-short-enums"))
576 flag_short_enums = 0;
577 else if (!strcmp (p, "-fshort-wchar"))
578 flag_short_wchar = 1;
579 else if (!strcmp (p, "-fno-short-wchar"))
580 flag_short_wchar = 0;
581 else if (!strcmp (p, "-fcond-mismatch"))
582 flag_cond_mismatch = 1;
583 else if (!strcmp (p, "-fno-cond-mismatch"))
584 flag_cond_mismatch = 0;
585 else if (!strcmp (p, "-fshort-double"))
586 flag_short_double = 1;
587 else if (!strcmp (p, "-fno-short-double"))
588 flag_short_double = 0;
589 else if (!strcmp (p, "-fasm"))
591 else if (!strcmp (p, "-fno-asm"))
593 else if (!strcmp (p, "-fbuiltin"))
595 else if (!strcmp (p, "-fno-builtin"))
597 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
599 else if (!strcmp (p, "-ansi"))
601 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
602 mesg_implicit_function_declaration = 2;
603 else if (!strcmp (p, "-Wimplicit-function-declaration"))
604 mesg_implicit_function_declaration = 1;
605 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
606 mesg_implicit_function_declaration = 0;
607 else if (!strcmp (p, "-Wimplicit-int"))
608 warn_implicit_int = 1;
609 else if (!strcmp (p, "-Wno-implicit-int"))
610 warn_implicit_int = 0;
611 else if (!strcmp (p, "-Wimplicit"))
613 warn_implicit_int = 1;
614 if (mesg_implicit_function_declaration != 2)
615 mesg_implicit_function_declaration = 1;
617 else if (!strcmp (p, "-Wno-implicit"))
618 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
619 else if (!strcmp (p, "-Wlong-long"))
621 else if (!strcmp (p, "-Wno-long-long"))
623 else if (!strcmp (p, "-Wwrite-strings"))
624 flag_const_strings = 1;
625 else if (!strcmp (p, "-Wno-write-strings"))
626 flag_const_strings = 0;
627 else if (!strcmp (p, "-Wcast-qual"))
629 else if (!strcmp (p, "-Wno-cast-qual"))
631 else if (!strcmp (p, "-Wbad-function-cast"))
632 warn_bad_function_cast = 1;
633 else if (!strcmp (p, "-Wno-bad-function-cast"))
634 warn_bad_function_cast = 0;
635 else if (!strcmp (p, "-Wno-missing-noreturn"))
636 warn_missing_noreturn = 0;
637 else if (!strcmp (p, "-Wmissing-format-attribute"))
638 warn_missing_format_attribute = 1;
639 else if (!strcmp (p, "-Wno-missing-format-attribute"))
640 warn_missing_format_attribute = 0;
641 else if (!strcmp (p, "-Wpointer-arith"))
642 warn_pointer_arith = 1;
643 else if (!strcmp (p, "-Wno-pointer-arith"))
644 warn_pointer_arith = 0;
645 else if (!strcmp (p, "-Wstrict-prototypes"))
646 warn_strict_prototypes = 1;
647 else if (!strcmp (p, "-Wno-strict-prototypes"))
648 warn_strict_prototypes = 0;
649 else if (!strcmp (p, "-Wmissing-prototypes"))
650 warn_missing_prototypes = 1;
651 else if (!strcmp (p, "-Wno-missing-prototypes"))
652 warn_missing_prototypes = 0;
653 else if (!strcmp (p, "-Wmissing-declarations"))
654 warn_missing_declarations = 1;
655 else if (!strcmp (p, "-Wno-missing-declarations"))
656 warn_missing_declarations = 0;
657 else if (!strcmp (p, "-Wredundant-decls"))
658 warn_redundant_decls = 1;
659 else if (!strcmp (p, "-Wno-redundant-decls"))
660 warn_redundant_decls = 0;
661 else if (!strcmp (p, "-Wnested-externs"))
662 warn_nested_externs = 1;
663 else if (!strcmp (p, "-Wno-nested-externs"))
664 warn_nested_externs = 0;
665 else if (!strcmp (p, "-Wtraditional"))
666 warn_traditional = 1;
667 else if (!strcmp (p, "-Wno-traditional"))
668 warn_traditional = 0;
669 else if (!strncmp (p, "-Wformat=", 9))
670 set_Wformat (atoi (p + 9));
671 else if (!strcmp (p, "-Wformat"))
673 else if (!strcmp (p, "-Wno-format"))
675 else if (!strcmp (p, "-Wformat-y2k"))
677 else if (!strcmp (p, "-Wno-format-y2k"))
679 else if (!strcmp (p, "-Wformat-extra-args"))
680 warn_format_extra_args = 1;
681 else if (!strcmp (p, "-Wno-format-extra-args"))
682 warn_format_extra_args = 0;
683 else if (!strcmp (p, "-Wformat-nonliteral"))
684 warn_format_nonliteral = 1;
685 else if (!strcmp (p, "-Wno-format-nonliteral"))
686 warn_format_nonliteral = 0;
687 else if (!strcmp (p, "-Wformat-security"))
688 warn_format_security = 1;
689 else if (!strcmp (p, "-Wno-format-security"))
690 warn_format_security = 0;
691 else if (!strcmp (p, "-Wchar-subscripts"))
692 warn_char_subscripts = 1;
693 else if (!strcmp (p, "-Wno-char-subscripts"))
694 warn_char_subscripts = 0;
695 else if (!strcmp (p, "-Wconversion"))
697 else if (!strcmp (p, "-Wno-conversion"))
699 else if (!strcmp (p, "-Wparentheses"))
700 warn_parentheses = 1;
701 else if (!strcmp (p, "-Wno-parentheses"))
702 warn_parentheses = 0;
703 else if (!strcmp (p, "-Wreturn-type"))
704 warn_return_type = 1;
705 else if (!strcmp (p, "-Wno-return-type"))
706 warn_return_type = 0;
707 else if (!strcmp (p, "-Wsequence-point"))
708 warn_sequence_point = 1;
709 else if (!strcmp (p, "-Wno-sequence-point"))
710 warn_sequence_point = 0;
711 else if (!strcmp (p, "-Wcomment"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wno-comment"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wcomments"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wno-comments"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wtrigraphs"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wno-trigraphs"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p, "-Wundef"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p, "-Wno-undef"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p, "-Wimport"))
728 ; /* cpp handles this one. */
729 else if (!strcmp (p, "-Wno-import"))
730 ; /* cpp handles this one. */
731 else if (!strcmp (p, "-Wmissing-braces"))
732 warn_missing_braces = 1;
733 else if (!strcmp (p, "-Wno-missing-braces"))
734 warn_missing_braces = 0;
735 else if (!strcmp (p, "-Wmain"))
737 else if (!strcmp (p, "-Wno-main"))
739 else if (!strcmp (p, "-Wsign-compare"))
740 warn_sign_compare = 1;
741 else if (!strcmp (p, "-Wno-sign-compare"))
742 warn_sign_compare = 0;
743 else if (!strcmp (p, "-Wfloat-equal"))
744 warn_float_equal = 1;
745 else if (!strcmp (p, "-Wno-float-equal"))
746 warn_float_equal = 0;
747 else if (!strcmp (p, "-Wmultichar"))
749 else if (!strcmp (p, "-Wno-multichar"))
751 else if (!strcmp (p, "-Wunknown-pragmas"))
752 /* Set to greater than 1, so that even unknown pragmas in system
753 headers will be warned about. */
754 warn_unknown_pragmas = 2;
755 else if (!strcmp (p, "-Wno-unknown-pragmas"))
756 warn_unknown_pragmas = 0;
757 else if (!strcmp (p, "-Wall"))
759 /* We save the value of warn_uninitialized, since if they put
760 -Wuninitialized on the command line, we need to generate a
761 warning about not using it without also specifying -O. */
762 if (warn_uninitialized != 1)
763 warn_uninitialized = 2;
764 warn_implicit_int = 1;
765 mesg_implicit_function_declaration = 1;
766 warn_return_type = 1;
770 warn_char_subscripts = 1;
771 warn_parentheses = 1;
772 warn_sequence_point = 1;
773 warn_missing_braces = 1;
774 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
775 it off only if it's not explicit. */
777 /* Only warn about unknown pragmas that are not in system headers. */
778 warn_unknown_pragmas = 1;
781 return strings_processed;
786 /* Hooks for print_node. */
789 print_lang_decl (file, node, indent)
790 FILE *file ATTRIBUTE_UNUSED;
791 tree node ATTRIBUTE_UNUSED;
792 int indent ATTRIBUTE_UNUSED;
797 print_lang_type (file, node, indent)
798 FILE *file ATTRIBUTE_UNUSED;
799 tree node ATTRIBUTE_UNUSED;
800 int indent ATTRIBUTE_UNUSED;
805 print_lang_identifier (file, node, indent)
810 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
811 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
812 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
813 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
814 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
815 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
816 if (C_IS_RESERVED_WORD (node))
818 tree rid = ridpointers[C_RID_CODE (node)];
819 indent_to (file, indent + 4);
820 fprintf (file, "rid ");
821 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
822 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
826 /* Hook called at end of compilation to assume 1 elt
827 for a top-level tentative array defn that wasn't complete before. */
830 finish_incomplete_decl (decl)
833 if (TREE_CODE (decl) == VAR_DECL)
835 tree type = TREE_TYPE (decl);
836 if (type != error_mark_node
837 && TREE_CODE (type) == ARRAY_TYPE
838 && ! DECL_EXTERNAL (decl)
839 && TYPE_DOMAIN (type) == 0)
841 warning_with_decl (decl, "array `%s' assumed to have one element");
843 complete_array_type (type, NULL_TREE, 1);
845 layout_decl (decl, 0);
850 /* Create a new `struct binding_level'. */
852 static struct binding_level *
853 make_binding_level ()
856 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
859 /* Nonzero if we are currently in the global binding level. */
864 return current_binding_level == global_binding_level;
870 keep_next_level_flag = 1;
873 /* Nonzero if the current level needs to have a BLOCK made. */
878 return ((current_binding_level->keep_if_subblocks
879 && current_binding_level->blocks != 0)
880 || current_binding_level->keep
881 || current_binding_level->names != 0
882 || (current_binding_level->tags != 0
883 && !current_binding_level->tag_transparent));
886 /* Identify this binding level as a level of parameters.
887 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
888 But it turns out there is no way to pass the right value for
889 DEFINITION_FLAG, so we ignore it. */
892 declare_parm_level (definition_flag)
893 int definition_flag ATTRIBUTE_UNUSED;
895 current_binding_level->parm_flag = 1;
898 /* Nonzero if currently making parm declarations. */
903 return current_binding_level->parm_flag;
906 /* Enter a new binding level.
907 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
908 not for that of tags. */
911 pushlevel (tag_transparent)
914 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
916 /* If this is the top level of a function,
917 just make sure that NAMED_LABELS is 0. */
919 if (current_binding_level == global_binding_level)
924 /* Reuse or create a struct for this binding level. */
926 if (free_binding_level)
928 newlevel = free_binding_level;
929 free_binding_level = free_binding_level->level_chain;
933 newlevel = make_binding_level ();
936 /* Add this level to the front of the chain (stack) of levels that
939 *newlevel = clear_binding_level;
940 newlevel->tag_transparent
942 || (current_binding_level
943 ? current_binding_level->subblocks_tag_transparent
945 newlevel->level_chain = current_binding_level;
946 current_binding_level = newlevel;
947 newlevel->keep = keep_next_level_flag;
948 keep_next_level_flag = 0;
949 newlevel->keep_if_subblocks = keep_next_if_subblocks;
950 keep_next_if_subblocks = 0;
953 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
956 clear_limbo_values (block)
961 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
962 if (DECL_NAME (tem) != 0)
963 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
965 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
966 clear_limbo_values (tem);
969 /* Exit a binding level.
970 Pop the level off, and restore the state of the identifier-decl mappings
971 that were in effect when this level was entered.
973 If KEEP is nonzero, this level had explicit declarations, so
974 and create a "block" (a BLOCK node) for the level
975 to record its declarations and subblocks for symbol table output.
977 If FUNCTIONBODY is nonzero, this level is the body of a function,
978 so create a block as if KEEP were set and also clear out all
981 If REVERSE is nonzero, reverse the order of decls before putting
982 them into the BLOCK. */
985 poplevel (keep, reverse, functionbody)
991 /* The chain of decls was accumulated in reverse order.
992 Put it into forward order, just for cleanliness. */
994 tree tags = current_binding_level->tags;
995 tree subblocks = current_binding_level->blocks;
998 int block_previously_created;
1000 keep |= current_binding_level->keep;
1002 /* This warning is turned off because it causes warnings for
1003 declarations like `extern struct foo *x'. */
1005 /* Warn about incomplete structure types in this level. */
1006 for (link = tags; link; link = TREE_CHAIN (link))
1007 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1009 tree type = TREE_VALUE (link);
1010 tree type_name = TYPE_NAME (type);
1011 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1013 : DECL_NAME (type_name));
1014 switch (TREE_CODE (type))
1017 error ("`struct %s' incomplete in scope ending here", id);
1020 error ("`union %s' incomplete in scope ending here", id);
1023 error ("`enum %s' incomplete in scope ending here", id);
1029 /* Get the decls in the order they were written.
1030 Usually current_binding_level->names is in reverse order.
1031 But parameter decls were previously put in forward order. */
1034 current_binding_level->names
1035 = decls = nreverse (current_binding_level->names);
1037 decls = current_binding_level->names;
1039 /* Output any nested inline functions within this block
1040 if they weren't already output. */
1042 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1043 if (TREE_CODE (decl) == FUNCTION_DECL
1044 && ! TREE_ASM_WRITTEN (decl)
1045 && DECL_INITIAL (decl) != 0
1046 && TREE_ADDRESSABLE (decl))
1048 /* If this decl was copied from a file-scope decl
1049 on account of a block-scope extern decl,
1050 propagate TREE_ADDRESSABLE to the file-scope decl.
1052 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1053 true, since then the decl goes through save_for_inline_copying. */
1054 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1055 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1056 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1059 /* We used to warn about unused variables in expand_end_bindings,
1060 i.e. while generating RTL. But in function-at-a-time mode we may
1061 choose to never expand a function at all (e.g. auto inlining), so
1062 we do this explicitly now. */
1063 warn_about_unused_variables (getdecls ());
1065 /* If there were any declarations or structure tags in that level,
1066 or if this level is a function body,
1067 create a BLOCK to record them for the life of this function. */
1070 block_previously_created = (current_binding_level->this_block != 0);
1071 if (block_previously_created)
1072 block = current_binding_level->this_block;
1073 else if (keep || functionbody
1074 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1075 block = make_node (BLOCK);
1078 BLOCK_VARS (block) = decls;
1079 BLOCK_SUBBLOCKS (block) = subblocks;
1082 /* In each subblock, record that this is its superior. */
1084 for (link = subblocks; link; link = TREE_CHAIN (link))
1085 BLOCK_SUPERCONTEXT (link) = block;
1087 /* Clear out the meanings of the local variables of this level. */
1089 for (link = decls; link; link = TREE_CHAIN (link))
1091 if (DECL_NAME (link) != 0)
1093 /* If the ident. was used or addressed via a local extern decl,
1094 don't forget that fact. */
1095 if (DECL_EXTERNAL (link))
1097 if (TREE_USED (link))
1098 TREE_USED (DECL_NAME (link)) = 1;
1099 if (TREE_ADDRESSABLE (link))
1100 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1102 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1106 /* Restore all name-meanings of the outer levels
1107 that were shadowed by this level. */
1109 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1110 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1112 /* If the level being exited is the top level of a function,
1113 check over all the labels, and clear out the current
1114 (function local) meanings of their names. */
1118 clear_limbo_values (block);
1120 /* If this is the top level block of a function,
1121 the vars are the function's parameters.
1122 Don't leave them in the BLOCK because they are
1123 found in the FUNCTION_DECL instead. */
1125 BLOCK_VARS (block) = 0;
1127 /* Clear out the definitions of all label names,
1128 since their scopes end here,
1129 and add them to BLOCK_VARS. */
1131 for (link = named_labels; link; link = TREE_CHAIN (link))
1133 register tree label = TREE_VALUE (link);
1135 if (DECL_INITIAL (label) == 0)
1137 error_with_decl (label, "label `%s' used but not defined");
1138 /* Avoid crashing later. */
1139 define_label (input_filename, lineno,
1142 else if (warn_unused_label && !TREE_USED (label))
1143 warning_with_decl (label, "label `%s' defined but not used");
1144 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1146 /* Put the labels into the "variables" of the
1147 top-level block, so debugger can see them. */
1148 TREE_CHAIN (label) = BLOCK_VARS (block);
1149 BLOCK_VARS (block) = label;
1153 /* Pop the current level, and free the structure for reuse. */
1156 register struct binding_level *level = current_binding_level;
1157 current_binding_level = current_binding_level->level_chain;
1159 level->level_chain = free_binding_level;
1160 free_binding_level = level;
1163 /* Dispose of the block that we just made inside some higher level. */
1165 DECL_INITIAL (current_function_decl) = block;
1168 if (!block_previously_created)
1169 current_binding_level->blocks
1170 = chainon (current_binding_level->blocks, block);
1172 /* If we did not make a block for the level just exited,
1173 any blocks made for inner levels
1174 (since they cannot be recorded as subblocks in that level)
1175 must be carried forward so they will later become subblocks
1176 of something else. */
1178 current_binding_level->blocks
1179 = chainon (current_binding_level->blocks, subblocks);
1181 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1182 binding contour so that they point to the appropriate construct, i.e.
1183 either to the current FUNCTION_DECL node, or else to the BLOCK node
1184 we just constructed.
1186 Note that for tagged types whose scope is just the formal parameter
1187 list for some function type specification, we can't properly set
1188 their TYPE_CONTEXTs here, because we don't have a pointer to the
1189 appropriate FUNCTION_TYPE node readily available to us. For those
1190 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1191 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1192 node which will represent the "scope" for these "parameter list local"
1196 for (link = tags; link; link = TREE_CHAIN (link))
1197 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1199 for (link = tags; link; link = TREE_CHAIN (link))
1200 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1203 TREE_USED (block) = 1;
1208 /* Delete the node BLOCK from the current binding level.
1209 This is used for the block inside a stmt expr ({...})
1210 so that the block can be reinserted where appropriate. */
1213 delete_block (block)
1217 if (current_binding_level->blocks == block)
1218 current_binding_level->blocks = TREE_CHAIN (block);
1219 for (t = current_binding_level->blocks; t;)
1221 if (TREE_CHAIN (t) == block)
1222 TREE_CHAIN (t) = TREE_CHAIN (block);
1226 TREE_CHAIN (block) = NULL;
1227 /* Clear TREE_USED which is always set by poplevel.
1228 The flag is set again if insert_block is called. */
1229 TREE_USED (block) = 0;
1232 /* Insert BLOCK at the end of the list of subblocks of the
1233 current binding level. This is used when a BIND_EXPR is expanded,
1234 to handle the BLOCK node inside the BIND_EXPR. */
1237 insert_block (block)
1240 TREE_USED (block) = 1;
1241 current_binding_level->blocks
1242 = chainon (current_binding_level->blocks, block);
1245 /* Set the BLOCK node for the innermost scope
1246 (the one we are currently in). */
1250 register tree block;
1252 current_binding_level->this_block = block;
1253 current_binding_level->names = chainon (current_binding_level->names,
1254 BLOCK_VARS (block));
1255 current_binding_level->blocks = chainon (current_binding_level->blocks,
1256 BLOCK_SUBBLOCKS (block));
1262 register struct binding_level *newlevel;
1264 /* Reuse or create a struct for this binding level. */
1266 if (free_binding_level)
1268 newlevel = free_binding_level;
1269 free_binding_level = free_binding_level->level_chain;
1273 newlevel = make_binding_level ();
1276 /* Add this level to the front of the chain (stack) of label levels. */
1278 newlevel->level_chain = label_level_chain;
1279 label_level_chain = newlevel;
1281 newlevel->names = named_labels;
1282 newlevel->shadowed = shadowed_labels;
1284 shadowed_labels = 0;
1290 register struct binding_level *level = label_level_chain;
1293 /* Clear out the definitions of the declared labels in this level.
1294 Leave in the list any ordinary, non-declared labels. */
1295 for (link = named_labels, prev = 0; link;)
1297 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1299 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1301 error_with_decl (TREE_VALUE (link),
1302 "label `%s' used but not defined");
1303 /* Avoid crashing later. */
1304 define_label (input_filename, lineno,
1305 DECL_NAME (TREE_VALUE (link)));
1307 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1308 warning_with_decl (TREE_VALUE (link),
1309 "label `%s' defined but not used");
1310 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1312 /* Delete this element from the list. */
1313 link = TREE_CHAIN (link);
1315 TREE_CHAIN (prev) = link;
1317 named_labels = link;
1322 link = TREE_CHAIN (link);
1326 /* Bring back all the labels that were shadowed. */
1327 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1328 if (DECL_NAME (TREE_VALUE (link)) != 0)
1329 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1330 = TREE_VALUE (link);
1332 named_labels = chainon (named_labels, level->names);
1333 shadowed_labels = level->shadowed;
1335 /* Pop the current level, and free the structure for reuse. */
1336 label_level_chain = label_level_chain->level_chain;
1337 level->level_chain = free_binding_level;
1338 free_binding_level = level;
1341 /* Push a definition or a declaration of struct, union or enum tag "name".
1342 "type" should be the type node.
1343 We assume that the tag "name" is not already defined.
1345 Note that the definition may really be just a forward reference.
1346 In that case, the TYPE_SIZE will be zero. */
1349 pushtag (name, type)
1352 register struct binding_level *b;
1354 /* Find the proper binding level for this type tag. */
1356 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1361 /* Record the identifier as the type's name if it has none. */
1363 if (TYPE_NAME (type) == 0)
1364 TYPE_NAME (type) = name;
1367 b->tags = tree_cons (name, type, b->tags);
1369 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1370 tagged type we just added to the current binding level. This fake
1371 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1372 to output a representation of a tagged type, and it also gives
1373 us a convenient place to record the "scope start" address for the
1376 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1378 /* An approximation for now, so we can tell this is a function-scope tag.
1379 This will be updated in poplevel. */
1380 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1383 /* Handle when a new declaration NEWDECL
1384 has the same name as an old one OLDDECL
1385 in the same binding contour.
1386 Prints an error message if appropriate.
1388 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1389 Otherwise, return 0.
1391 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1392 and OLDDECL is in an outer binding level and should thus not be changed. */
1395 duplicate_decls (newdecl, olddecl, different_binding_level)
1396 register tree newdecl, olddecl;
1397 int different_binding_level;
1399 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1400 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1401 && DECL_INITIAL (newdecl) != 0);
1402 tree oldtype = TREE_TYPE (olddecl);
1403 tree newtype = TREE_TYPE (newdecl);
1406 if (DECL_P (olddecl))
1407 DECL_ATTRIBUTES (newdecl)
1408 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1410 if (TREE_CODE (newtype) == ERROR_MARK
1411 || TREE_CODE (oldtype) == ERROR_MARK)
1414 /* New decl is completely inconsistent with the old one =>
1415 tell caller to replace the old one.
1416 This is always an error except in the case of shadowing a builtin. */
1417 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1419 if (TREE_CODE (olddecl) == FUNCTION_DECL
1420 && (DECL_BUILT_IN (olddecl)
1421 || DECL_BUILT_IN_NONANSI (olddecl)))
1423 /* If you declare a built-in or predefined function name as static,
1424 the old definition is overridden,
1425 but optionally warn this was a bad choice of name. */
1426 if (!TREE_PUBLIC (newdecl))
1430 else if (DECL_BUILT_IN (olddecl))
1431 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1433 warning_with_decl (newdecl, "shadowing library function `%s'");
1435 /* Likewise, if the built-in is not ansi, then programs can
1436 override it even globally without an error. */
1437 else if (! DECL_BUILT_IN (olddecl))
1438 warning_with_decl (newdecl,
1439 "library function `%s' declared as non-function");
1441 else if (DECL_BUILT_IN_NONANSI (olddecl))
1442 warning_with_decl (newdecl,
1443 "built-in function `%s' declared as non-function");
1445 warning_with_decl (newdecl,
1446 "built-in function `%s' declared as non-function");
1450 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1451 error_with_decl (olddecl, "previous declaration of `%s'");
1457 /* For real parm decl following a forward decl,
1458 return 1 so old decl will be reused. */
1459 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1460 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1463 /* The new declaration is the same kind of object as the old one.
1464 The declarations may partially match. Print warnings if they don't
1465 match enough. Ultimately, copy most of the information from the new
1466 decl to the old one, and keep using the old one. */
1468 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1469 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1470 && DECL_INITIAL (olddecl) == 0)
1471 /* If -traditional, avoid error for redeclaring fcn
1472 after implicit decl. */
1474 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && DECL_BUILT_IN (olddecl))
1477 /* A function declaration for a built-in function. */
1478 if (!TREE_PUBLIC (newdecl))
1480 /* If you declare a built-in function name as static, the
1481 built-in definition is overridden,
1482 but optionally warn this was a bad choice of name. */
1484 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1485 /* Discard the old built-in function. */
1488 else if (!types_match)
1490 /* Accept the return type of the new declaration if same modes. */
1491 tree oldreturntype = TREE_TYPE (oldtype);
1492 tree newreturntype = TREE_TYPE (newtype);
1494 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1496 /* Function types may be shared, so we can't just modify
1497 the return type of olddecl's function type. */
1499 = build_function_type (newreturntype,
1500 TYPE_ARG_TYPES (oldtype));
1502 types_match = comptypes (newtype, trytype);
1506 /* Accept harmless mismatch in first argument type also.
1507 This is for the ffs and fprintf builtins. */
1508 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1509 && TYPE_ARG_TYPES (oldtype) != 0
1510 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1511 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1512 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1513 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1515 /* Function types may be shared, so we can't just modify
1516 the return type of olddecl's function type. */
1518 = build_function_type (TREE_TYPE (oldtype),
1519 tree_cons (NULL_TREE,
1520 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1521 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1523 types_match = comptypes (newtype, trytype);
1527 if (! different_binding_level)
1528 TREE_TYPE (olddecl) = oldtype;
1532 /* If types don't match for a built-in, throw away the built-in. */
1533 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1537 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1538 && DECL_SOURCE_LINE (olddecl) == 0)
1540 /* A function declaration for a predeclared function
1541 that isn't actually built in. */
1542 if (!TREE_PUBLIC (newdecl))
1544 /* If you declare it as static, the
1545 default definition is overridden. */
1548 else if (!types_match)
1550 /* If the types don't match, preserve volatility indication.
1551 Later on, we will discard everything else about the
1552 default declaration. */
1553 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1556 /* Permit char *foo () to match void *foo (...) if not pedantic,
1557 if one of them came from a system header file. */
1558 else if (!types_match
1559 && TREE_CODE (olddecl) == FUNCTION_DECL
1560 && TREE_CODE (newdecl) == FUNCTION_DECL
1561 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1562 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1563 && (DECL_IN_SYSTEM_HEADER (olddecl)
1564 || DECL_IN_SYSTEM_HEADER (newdecl))
1565 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1566 && TYPE_ARG_TYPES (oldtype) == 0
1567 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1568 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1570 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1571 && TYPE_ARG_TYPES (newtype) == 0
1572 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1573 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1576 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1577 /* Make sure we keep void * as ret type, not char *. */
1578 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1579 TREE_TYPE (newdecl) = newtype = oldtype;
1581 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1582 we will come back here again. */
1583 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1585 else if (!types_match
1586 /* Permit char *foo (int, ...); followed by char *foo ();
1588 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1590 /* Return types must still match. */
1591 && comptypes (TREE_TYPE (oldtype),
1592 TREE_TYPE (newtype))
1593 && TYPE_ARG_TYPES (newtype) == 0))
1595 error_with_decl (newdecl, "conflicting types for `%s'");
1596 /* Check for function type mismatch
1597 involving an empty arglist vs a nonempty one. */
1598 if (TREE_CODE (olddecl) == FUNCTION_DECL
1599 && comptypes (TREE_TYPE (oldtype),
1600 TREE_TYPE (newtype))
1601 && ((TYPE_ARG_TYPES (oldtype) == 0
1602 && DECL_INITIAL (olddecl) == 0)
1604 (TYPE_ARG_TYPES (newtype) == 0
1605 && DECL_INITIAL (newdecl) == 0)))
1607 /* Classify the problem further. */
1608 register tree t = TYPE_ARG_TYPES (oldtype);
1610 t = TYPE_ARG_TYPES (newtype);
1611 for (; t; t = TREE_CHAIN (t))
1613 register tree type = TREE_VALUE (t);
1615 if (TREE_CHAIN (t) == 0
1616 && TYPE_MAIN_VARIANT (type) != void_type_node)
1618 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1622 if (simple_type_promotes_to (type) != NULL_TREE)
1624 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1629 error_with_decl (olddecl, "previous declaration of `%s'");
1633 errmsg = redeclaration_error_message (newdecl, olddecl);
1639 error_with_decl (newdecl, "redefinition of `%s'");
1642 error_with_decl (newdecl, "redeclaration of `%s'");
1645 error_with_decl (newdecl, "conflicting declarations of `%s'");
1651 error_with_decl (olddecl,
1652 ((DECL_INITIAL (olddecl)
1653 && current_binding_level == global_binding_level)
1654 ? "`%s' previously defined here"
1655 : "`%s' previously declared here"));
1657 else if (TREE_CODE (newdecl) == TYPE_DECL
1658 && (DECL_IN_SYSTEM_HEADER (olddecl)
1659 || DECL_IN_SYSTEM_HEADER (newdecl)))
1661 warning_with_decl (newdecl, "redefinition of `%s'");
1664 ((DECL_INITIAL (olddecl)
1665 && current_binding_level == global_binding_level)
1666 ? "`%s' previously defined here"
1667 : "`%s' previously declared here"));
1669 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1670 && DECL_INITIAL (olddecl) != 0
1671 && TYPE_ARG_TYPES (oldtype) == 0
1672 && TYPE_ARG_TYPES (newtype) != 0
1673 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1675 register tree type, parm;
1677 /* Prototype decl follows defn w/o prototype. */
1679 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1680 type = TYPE_ARG_TYPES (newtype),
1683 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1685 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1686 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1688 warning_with_decl (newdecl, "prototype for `%s' follows");
1689 warning_with_decl (olddecl, "non-prototype definition here");
1692 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1693 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1695 error_with_decl (newdecl,
1696 "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 && !in_system_header
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 if (TYPE_ARG_TYPES (oldtype) != 0
1798 && TYPE_ARG_TYPES (newtype) == 0)
1799 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1802 = build_type_attribute_variant
1804 merge_attributes (TYPE_ATTRIBUTES (newtype),
1805 TYPE_ATTRIBUTES (oldtype)));
1809 = TREE_TYPE (olddecl)
1810 = common_type (newtype, oldtype);
1813 /* Lay the type out, unless already done. */
1814 if (oldtype != TREE_TYPE (newdecl))
1816 if (TREE_TYPE (newdecl) != error_mark_node)
1817 layout_type (TREE_TYPE (newdecl));
1818 if (TREE_CODE (newdecl) != FUNCTION_DECL
1819 && TREE_CODE (newdecl) != TYPE_DECL
1820 && TREE_CODE (newdecl) != CONST_DECL)
1821 layout_decl (newdecl, 0);
1825 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1826 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1827 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1828 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1829 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1830 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1832 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1833 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1837 /* Keep the old rtl since we can safely use it. */
1838 COPY_DECL_RTL (olddecl, newdecl);
1840 /* Merge the type qualifiers. */
1841 if (TREE_CODE (olddecl) == FUNCTION_DECL
1842 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1843 && ! TREE_THIS_VOLATILE (newdecl))
1844 TREE_THIS_VOLATILE (write_olddecl) = 0;
1846 if (TREE_READONLY (newdecl))
1847 TREE_READONLY (write_olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1851 TREE_THIS_VOLATILE (write_olddecl) = 1;
1852 if (TREE_CODE (newdecl) == VAR_DECL
1853 /* If an automatic variable is re-declared in the same
1854 function scope, but the old declaration was not
1855 volatile, make_var_volatile() would crash because the
1856 variable would have been assigned to a pseudo, not a
1857 MEM. Since this duplicate declaration is invalid
1858 anyway, we just skip the call. */
1860 make_var_volatile (newdecl);
1863 /* Keep source location of definition rather than declaration. */
1864 /* When called with different_binding_level set, keep the old
1865 information so that meaningful diagnostics can be given. */
1866 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1867 && ! different_binding_level)
1869 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1870 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1873 /* Merge the unused-warning information. */
1874 if (DECL_IN_SYSTEM_HEADER (olddecl))
1875 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1876 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1877 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1879 /* Merge the initialization information. */
1880 /* When called with different_binding_level set, don't copy over
1881 DECL_INITIAL, so that we don't accidentally change function
1882 declarations into function definitions. */
1883 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1884 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1886 /* Merge the section attribute.
1887 We want to issue an error if the sections conflict but that must be
1888 done later in decl_attributes since we are called before attributes
1890 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1891 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1893 /* Copy the assembler name.
1894 Currently, it can only be defined in the prototype. */
1895 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1897 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1899 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1900 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1902 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1903 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1904 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1905 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1906 DECL_NO_LIMIT_STACK (newdecl)
1907 |= DECL_NO_LIMIT_STACK (olddecl);
1910 /* If cannot merge, then use the new type and qualifiers,
1911 and don't preserve the old rtl. */
1912 else if (! different_binding_level)
1914 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1915 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1916 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1917 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1920 /* Merge the storage class information. */
1921 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1922 /* For functions, static overrides non-static. */
1923 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1925 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1926 /* This is since we don't automatically
1927 copy the attributes of NEWDECL into OLDDECL. */
1928 /* No need to worry about different_binding_level here because
1929 then TREE_PUBLIC (newdecl) was true. */
1930 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1931 /* If this clears `static', clear it in the identifier too. */
1932 if (! TREE_PUBLIC (olddecl))
1933 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1935 if (DECL_EXTERNAL (newdecl))
1937 if (! different_binding_level)
1939 /* Don't mess with these flags on local externs; they remain
1940 external even if there's a declaration at file scope which
1942 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1943 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1945 /* An extern decl does not override previous storage class. */
1946 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1947 if (! DECL_EXTERNAL (newdecl))
1948 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1952 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1953 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1956 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1958 /* If we're redefining a function previously defined as extern
1959 inline, make sure we emit debug info for the inline before we
1960 throw it away, in case it was inlined into a function that hasn't
1961 been written out yet. */
1962 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1964 (*debug_hooks->outlining_inline_function) (olddecl);
1966 /* The new defn must not be inline. */
1967 DECL_INLINE (newdecl) = 0;
1968 DECL_UNINLINABLE (newdecl) = 1;
1972 /* If either decl says `inline', this fn is inline,
1973 unless its definition was passed already. */
1974 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1975 DECL_INLINE (olddecl) = 1;
1977 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1980 if (DECL_BUILT_IN (olddecl))
1982 /* Get rid of any built-in function if new arg types don't match it
1983 or if we have a function definition. */
1984 if (! types_match || new_is_definition)
1986 if (! different_binding_level)
1988 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1989 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1994 /* If redeclaring a builtin function, and not a definition,
1995 it stays built in. */
1996 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1997 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2000 /* Also preserve various other info from the definition. */
2001 else if (! new_is_definition)
2002 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2003 if (! new_is_definition)
2005 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2006 /* When called with different_binding_level set, don't copy over
2007 DECL_INITIAL, so that we don't accidentally change function
2008 declarations into function definitions. */
2009 if (! different_binding_level)
2010 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2011 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2012 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2013 if (DECL_INLINE (newdecl))
2014 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2017 if (different_binding_level)
2020 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2021 But preserve OLDDECL's DECL_UID. */
2023 register unsigned olddecl_uid = DECL_UID (olddecl);
2025 memcpy ((char *) olddecl + sizeof (struct tree_common),
2026 (char *) newdecl + sizeof (struct tree_common),
2027 sizeof (struct tree_decl) - sizeof (struct tree_common));
2028 DECL_UID (olddecl) = olddecl_uid;
2031 /* NEWDECL contains the merged attribute lists.
2032 Update OLDDECL to be the same. */
2033 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2038 /* Record a decl-node X as belonging to the current lexical scope.
2039 Check for errors (such as an incompatible declaration for the same
2040 name already seen in the same scope).
2042 Returns either X or an old decl for the same name.
2043 If an old decl is returned, it may have been smashed
2044 to agree with what X says. */
2051 register tree name = DECL_NAME (x);
2052 register struct binding_level *b = current_binding_level;
2054 DECL_CONTEXT (x) = current_function_decl;
2055 /* A local extern declaration for a function doesn't constitute nesting.
2056 A local auto declaration does, since it's a forward decl
2057 for a nested function coming later. */
2058 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2059 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2060 DECL_CONTEXT (x) = 0;
2062 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2063 && x != IDENTIFIER_IMPLICIT_DECL (name)
2064 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2065 && !DECL_IN_SYSTEM_HEADER (x))
2066 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2072 int different_binding_level = 0;
2074 t = lookup_name_current_level (name);
2075 /* Don't type check externs here when -traditional. This is so that
2076 code with conflicting declarations inside blocks will get warnings
2077 not errors. X11 for instance depends on this. */
2078 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2080 t = IDENTIFIER_GLOBAL_VALUE (name);
2081 /* Type decls at global scope don't conflict with externs declared
2082 inside lexical blocks. */
2083 if (t && TREE_CODE (t) == TYPE_DECL)
2085 different_binding_level = 1;
2087 if (t != 0 && t == error_mark_node)
2088 /* error_mark_node is 0 for a while during initialization! */
2091 error_with_decl (x, "`%s' used prior to declaration");
2096 file = DECL_SOURCE_FILE (t);
2097 line = DECL_SOURCE_LINE (t);
2100 /* If this decl is `static' and an implicit decl was seen previously,
2101 warn. But don't complain if -traditional,
2102 since traditional compilers don't complain. */
2103 if (! flag_traditional && TREE_PUBLIC (name)
2104 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2105 sets this for all functions. */
2106 && ! TREE_PUBLIC (x)
2107 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2108 /* We used to warn also for explicit extern followed by static,
2109 but sometimes you need to do it that way. */
2110 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2112 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2113 IDENTIFIER_POINTER (name));
2114 pedwarn_with_file_and_line
2115 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2116 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2117 "previous declaration of `%s'",
2118 IDENTIFIER_POINTER (name));
2119 TREE_THIS_VOLATILE (name) = 1;
2122 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2124 if (TREE_CODE (t) == PARM_DECL)
2126 /* Don't allow more than one "real" duplicate
2127 of a forward parm decl. */
2128 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2134 /* If we are processing a typedef statement, generate a whole new
2135 ..._TYPE node (which will be just an variant of the existing
2136 ..._TYPE node with identical properties) and then install the
2137 TYPE_DECL node generated to represent the typedef name as the
2138 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2140 The whole point here is to end up with a situation where each
2141 and every ..._TYPE node the compiler creates will be uniquely
2142 associated with AT MOST one node representing a typedef name.
2143 This way, even though the compiler substitutes corresponding
2144 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2145 early on, later parts of the compiler can always do the reverse
2146 translation and get back the corresponding typedef name. For
2149 typedef struct S MY_TYPE;
2152 Later parts of the compiler might only know that `object' was of
2153 type `struct S' if it were not for code just below. With this
2154 code however, later parts of the compiler see something like:
2156 struct S' == struct S
2157 typedef struct S' MY_TYPE;
2160 And they can then deduce (from the node for type struct S') that
2161 the original object declaration was:
2165 Being able to do this is important for proper support of protoize,
2166 and also for generating precise symbolic debugging information
2167 which takes full account of the programmer's (typedef) vocabulary.
2169 Obviously, we don't want to generate a duplicate ..._TYPE node if
2170 the TYPE_DECL node that we are now processing really represents a
2171 standard built-in type.
2173 Since all standard types are effectively declared at line zero
2174 in the source file, we can easily check to see if we are working
2175 on a standard type by checking the current value of lineno. */
2177 if (TREE_CODE (x) == TYPE_DECL)
2179 if (DECL_SOURCE_LINE (x) == 0)
2181 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2182 TYPE_NAME (TREE_TYPE (x)) = x;
2184 else if (TREE_TYPE (x) != error_mark_node
2185 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2187 tree tt = TREE_TYPE (x);
2188 DECL_ORIGINAL_TYPE (x) = tt;
2189 tt = build_type_copy (tt);
2191 TREE_USED (tt) = TREE_USED (x);
2196 /* Multiple external decls of the same identifier ought to match.
2197 Check against both global declarations (when traditional) and out of
2198 scope (limbo) block level declarations.
2200 We get warnings about inline functions where they are defined.
2201 Avoid duplicate warnings where they are used. */
2203 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2207 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2208 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2209 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2210 decl = IDENTIFIER_GLOBAL_VALUE (name);
2211 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2212 /* Decls in limbo are always extern, so no need to check that. */
2213 decl = IDENTIFIER_LIMBO_VALUE (name);
2217 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2218 /* If old decl is built-in, we already warned if we should. */
2219 && !DECL_BUILT_IN (decl))
2221 pedwarn_with_decl (x,
2222 "type mismatch with previous external decl");
2223 pedwarn_with_decl (decl, "previous external decl of `%s'");
2227 /* If a function has had an implicit declaration, and then is defined,
2228 make sure they are compatible. */
2230 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2231 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2232 && TREE_CODE (x) == FUNCTION_DECL
2233 && ! comptypes (TREE_TYPE (x),
2234 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2236 warning_with_decl (x, "type mismatch with previous implicit declaration");
2237 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2238 "previous implicit declaration of `%s'");
2241 /* In PCC-compatibility mode, extern decls of vars with no current decl
2242 take effect at top level no matter where they are. */
2243 if (flag_traditional && DECL_EXTERNAL (x)
2244 && lookup_name (name) == 0)
2246 tree type = TREE_TYPE (x);
2248 /* But don't do this if the type contains temporary nodes. */
2251 if (type == error_mark_node)
2253 if (TYPE_CONTEXT (type))
2255 warning_with_decl (x, "type of external `%s' is not global");
2256 /* By exiting the loop early, we leave TYPE nonzero,
2257 and thus prevent globalization of the decl. */
2260 else if (TREE_CODE (type) == FUNCTION_TYPE
2261 && TYPE_ARG_TYPES (type) != 0)
2262 /* The types might not be truly local,
2263 but the list of arg types certainly is temporary.
2264 Since prototypes are nontraditional,
2265 ok not to do the traditional thing. */
2267 type = TREE_TYPE (type);
2271 b = global_binding_level;
2274 /* This name is new in its binding level.
2275 Install the new declaration and return it. */
2276 if (b == global_binding_level)
2278 /* Install a global value. */
2280 /* If the first global decl has external linkage,
2281 warn if we later see static one. */
2282 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2283 TREE_PUBLIC (name) = 1;
2285 IDENTIFIER_GLOBAL_VALUE (name) = x;
2287 /* We no longer care about any previous block level declarations. */
2288 IDENTIFIER_LIMBO_VALUE (name) = 0;
2290 /* Don't forget if the function was used via an implicit decl. */
2291 if (IDENTIFIER_IMPLICIT_DECL (name)
2292 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2293 TREE_USED (x) = 1, TREE_USED (name) = 1;
2295 /* Don't forget if its address was taken in that way. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_ADDRESSABLE (x) = 1;
2300 /* Warn about mismatches against previous implicit decl. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2302 /* If this real decl matches the implicit, don't complain. */
2303 && ! (TREE_CODE (x) == FUNCTION_DECL
2304 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2305 == integer_type_node)))
2306 pedwarn ("`%s' was previously implicitly declared to return `int'",
2307 IDENTIFIER_POINTER (name));
2309 /* If this decl is `static' and an `extern' was seen previously,
2310 that is erroneous. */
2311 if (TREE_PUBLIC (name)
2312 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2314 /* Okay to redeclare an ANSI built-in as static. */
2315 if (t != 0 && DECL_BUILT_IN (t))
2317 /* Okay to declare a non-ANSI built-in as anything. */
2318 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2320 /* Okay to have global type decl after an earlier extern
2321 declaration inside a lexical block. */
2322 else if (TREE_CODE (x) == TYPE_DECL)
2324 else if (IDENTIFIER_IMPLICIT_DECL (name))
2326 if (! TREE_THIS_VOLATILE (name))
2327 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2328 IDENTIFIER_POINTER (name));
2331 pedwarn ("`%s' was declared `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2337 /* Here to install a non-global value. */
2338 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2339 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2341 IDENTIFIER_LOCAL_VALUE (name) = x;
2343 /* If this is an extern function declaration, see if we
2344 have a global definition or declaration for the function. */
2347 && TREE_CODE (x) == FUNCTION_DECL
2348 && TREE_CODE (oldglobal) == FUNCTION_DECL
2349 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2351 /* We have one. Their types must agree. */
2352 if (! comptypes (TREE_TYPE (x),
2353 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2354 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2357 /* Inner extern decl is inline if global one is.
2358 Copy enough to really inline it. */
2359 if (DECL_INLINE (oldglobal))
2361 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2362 DECL_INITIAL (x) = (current_function_decl == oldglobal
2363 ? 0 : DECL_INITIAL (oldglobal));
2364 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2365 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2366 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2367 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2368 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2369 DECL_ABSTRACT_ORIGIN (x)
2370 = DECL_ABSTRACT_ORIGIN (oldglobal);
2372 /* Inner extern decl is built-in if global one is. */
2373 if (DECL_BUILT_IN (oldglobal))
2375 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2376 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2378 /* Keep the arg types from a file-scope fcn defn. */
2379 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2380 && DECL_INITIAL (oldglobal)
2381 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2382 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2387 /* This case is probably sometimes the right thing to do. */
2388 /* If we have a local external declaration,
2389 then any file-scope declaration should not
2390 have been static. */
2391 if (oldlocal == 0 && oldglobal != 0
2392 && !TREE_PUBLIC (oldglobal)
2393 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2394 warning ("`%s' locally external but globally static",
2395 IDENTIFIER_POINTER (name));
2398 /* If we have a local external declaration,
2399 and no file-scope declaration has yet been seen,
2400 then if we later have a file-scope decl it must not be static. */
2402 && DECL_EXTERNAL (x)
2406 TREE_PUBLIC (name) = 1;
2408 /* Save this decl, so that we can do type checking against
2409 other decls after it falls out of scope.
2411 Only save it once. This prevents temporary decls created in
2412 expand_inline_function from being used here, since this
2413 will have been set when the inline function was parsed.
2414 It also helps give slightly better warnings. */
2415 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2416 IDENTIFIER_LIMBO_VALUE (name) = x;
2419 /* Warn if shadowing an argument at the top level of the body. */
2420 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2421 /* This warning doesn't apply to the parms of a nested fcn. */
2422 && ! current_binding_level->parm_flag
2423 /* Check that this is one level down from the parms. */
2424 && current_binding_level->level_chain->parm_flag
2425 /* Check that the decl being shadowed
2426 comes from the parm level, one level up. */
2427 && chain_member (oldlocal, current_binding_level->level_chain->names))
2429 if (TREE_CODE (oldlocal) == PARM_DECL)
2430 pedwarn ("declaration of `%s' shadows a parameter",
2431 IDENTIFIER_POINTER (name));
2433 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2434 IDENTIFIER_POINTER (name));
2437 /* Maybe warn if shadowing something else. */
2438 else if (warn_shadow && !DECL_EXTERNAL (x)
2439 /* No shadow warnings for internally generated vars. */
2440 && DECL_SOURCE_LINE (x) != 0
2441 /* No shadow warnings for vars made for inlining. */
2442 && ! DECL_FROM_INLINE (x))
2444 const char *id = IDENTIFIER_POINTER (name);
2446 if (TREE_CODE (x) == PARM_DECL
2447 && current_binding_level->level_chain->parm_flag)
2448 /* Don't warn about the parm names in function declarator
2449 within a function declarator.
2450 It would be nice to avoid warning in any function
2451 declarator in a declaration, as opposed to a definition,
2452 but there is no way to tell it's not a definition. */
2454 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2455 warning ("declaration of `%s' shadows a parameter", id);
2456 else if (oldlocal != 0)
2457 warning ("declaration of `%s' shadows previous local", id);
2458 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2459 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2460 warning ("declaration of `%s' shadows global declaration", id);
2463 /* If storing a local value, there may already be one (inherited).
2464 If so, record it for restoration when this binding level ends. */
2466 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2469 /* Keep count of variables in this level with incomplete type.
2470 If the input is erroneous, we can have error_mark in the type
2471 slot (e.g. "f(void a, ...)") - that doesn't count as an
2473 if (TREE_TYPE (x) != error_mark_node
2474 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2478 /* Put decls on list in reverse order.
2479 We will reverse them later if necessary. */
2480 TREE_CHAIN (x) = b->names;
2486 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2489 pushdecl_top_level (x)
2493 register struct binding_level *b = current_binding_level;
2495 current_binding_level = global_binding_level;
2497 current_binding_level = b;
2501 /* Generate an implicit declaration for identifier FUNCTIONID
2502 as a function of type int (). Print a warning if appropriate. */
2505 implicitly_declare (functionid)
2509 int traditional_warning = 0;
2510 /* Only one "implicit declaration" warning per identifier. */
2511 int implicit_warning;
2513 /* We used to reuse an old implicit decl here,
2514 but this loses with inline functions because it can clobber
2515 the saved decl chains. */
2517 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2518 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2521 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2523 /* Warn of implicit decl following explicit local extern decl.
2524 This is probably a program designed for traditional C. */
2525 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2526 traditional_warning = 1;
2528 /* Warn once of an implicit declaration. */
2529 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2531 DECL_EXTERNAL (decl) = 1;
2532 TREE_PUBLIC (decl) = 1;
2534 /* Record that we have an implicit decl and this is it. */
2535 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2537 /* ANSI standard says implicit declarations are in the innermost block.
2538 So we record the decl in the standard fashion.
2539 If flag_traditional is set, pushdecl does it top-level. */
2542 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2543 maybe_objc_check_decl (decl);
2545 rest_of_decl_compilation (decl, NULL, 0, 0);
2547 if (implicit_warning)
2548 implicit_decl_warning (functionid);
2549 else if (warn_traditional && traditional_warning)
2550 warning ("function `%s' was previously declared within a block",
2551 IDENTIFIER_POINTER (functionid));
2553 /* Write a record describing this implicit function declaration to the
2554 prototypes file (if requested). */
2556 gen_aux_info_record (decl, 0, 1, 0);
2562 implicit_decl_warning (id)
2565 const char *name = IDENTIFIER_POINTER (id);
2566 if (mesg_implicit_function_declaration == 2)
2567 error ("implicit declaration of function `%s'", name);
2568 else if (mesg_implicit_function_declaration == 1)
2569 warning ("implicit declaration of function `%s'", name);
2572 /* Return zero if the declaration NEWDECL is valid
2573 when the declaration OLDDECL (assumed to be for the same name)
2574 has already been seen.
2575 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2576 and 3 if it is a conflicting declaration. */
2579 redeclaration_error_message (newdecl, olddecl)
2580 tree newdecl, olddecl;
2582 if (TREE_CODE (newdecl) == TYPE_DECL)
2584 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2586 /* pushdecl creates distinct types for TYPE_DECLs by calling
2587 build_type_copy, so the above comparison generally fails. We do
2588 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2589 is equivalent to what this code used to do before the build_type_copy
2590 call. The variant type distinction should not matter for traditional
2591 code, because it doesn't have type qualifiers. */
2592 if (flag_traditional
2593 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2595 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2599 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2601 /* Declarations of functions can insist on internal linkage
2602 but they can't be inconsistent with internal linkage,
2603 so there can be no error on that account.
2604 However defining the same name twice is no good. */
2605 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2606 /* However, defining once as extern inline and a second
2607 time in another way is ok. */
2608 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2609 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2613 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2615 /* Objects declared at top level: */
2616 /* If at least one is a reference, it's ok. */
2617 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2619 /* Reject two definitions. */
2620 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2622 /* Now we have two tentative defs, or one tentative and one real def. */
2623 /* Insist that the linkage match. */
2624 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2628 else if (current_binding_level->parm_flag
2629 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2633 /* Newdecl has block scope. If olddecl has block scope also, then
2634 reject two definitions, and reject a definition together with an
2635 external reference. Otherwise, it is OK, because newdecl must
2636 be an extern reference to olddecl. */
2637 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2638 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2644 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2645 Create one if none exists so far for the current function.
2646 This function is called for both label definitions and label references. */
2652 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2654 if (current_function_decl == 0)
2656 error ("label %s referenced outside of any function",
2657 IDENTIFIER_POINTER (id));
2661 /* Use a label already defined or ref'd with this name. */
2664 /* But not if it is inherited and wasn't declared to be inheritable. */
2665 if (DECL_CONTEXT (decl) != current_function_decl
2666 && ! C_DECLARED_LABEL_FLAG (decl))
2667 return shadow_label (id);
2671 decl = build_decl (LABEL_DECL, id, void_type_node);
2673 /* A label not explicitly declared must be local to where it's ref'd. */
2674 DECL_CONTEXT (decl) = current_function_decl;
2676 DECL_MODE (decl) = VOIDmode;
2678 /* Say where one reference is to the label,
2679 for the sake of the error if it is not defined. */
2680 DECL_SOURCE_LINE (decl) = lineno;
2681 DECL_SOURCE_FILE (decl) = input_filename;
2683 IDENTIFIER_LABEL_VALUE (id) = decl;
2685 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2690 /* Make a label named NAME in the current function,
2691 shadowing silently any that may be inherited from containing functions
2692 or containing scopes.
2694 Note that valid use, if the label being shadowed
2695 comes from another scope in the same function,
2696 requires calling declare_nonlocal_label right away. */
2702 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2708 /* Check to make sure that the label hasn't already been declared
2709 at this label scope */
2710 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2711 if (TREE_VALUE (dup) == decl)
2713 error ("duplicate label declaration `%s'",
2714 IDENTIFIER_POINTER (name));
2715 error_with_decl (TREE_VALUE (dup),
2716 "this is a previous declaration");
2717 /* Just use the previous declaration. */
2718 return lookup_label (name);
2721 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2722 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2725 return lookup_label (name);
2728 /* Define a label, specifying the location in the source file.
2729 Return the LABEL_DECL node for the label, if the definition is valid.
2730 Otherwise return 0. */
2733 define_label (filename, line, name)
2734 const char *filename;
2738 tree decl = lookup_label (name);
2740 /* If label with this name is known from an outer context, shadow it. */
2741 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2743 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2744 IDENTIFIER_LABEL_VALUE (name) = 0;
2745 decl = lookup_label (name);
2748 if (warn_traditional && !in_system_header && lookup_name (name))
2749 warning_with_file_and_line (filename, line,
2750 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2751 IDENTIFIER_POINTER (name));
2753 if (DECL_INITIAL (decl) != 0)
2755 error_with_file_and_line (filename, line, "duplicate label `%s'",
2756 IDENTIFIER_POINTER (name));
2761 /* Mark label as having been defined. */
2762 DECL_INITIAL (decl) = error_mark_node;
2763 /* Say where in the source. */
2764 DECL_SOURCE_FILE (decl) = filename;
2765 DECL_SOURCE_LINE (decl) = line;
2770 /* Return the list of declarations of the current level.
2771 Note that this list is in reverse order unless/until
2772 you nreverse it; and when you do nreverse it, you must
2773 store the result back using `storedecls' or you will lose. */
2778 return current_binding_level->names;
2781 /* Return the list of type-tags (for structs, etc) of the current level. */
2786 return current_binding_level->tags;
2789 /* Store the list of declarations of the current level.
2790 This is done for the parameter declarations of a function being defined,
2791 after they are modified in the light of any missing parameters. */
2797 current_binding_level->names = decls;
2800 /* Similarly, store the list of tags of the current level. */
2806 current_binding_level->tags = tags;
2809 /* Given NAME, an IDENTIFIER_NODE,
2810 return the structure (or union or enum) definition for that name.
2811 Searches binding levels from BINDING_LEVEL up to the global level.
2812 If THISLEVEL_ONLY is nonzero, searches only the specified context
2813 (but skips any tag-transparent contexts to find one that is
2814 meaningful for tags).
2815 CODE says which kind of type the caller wants;
2816 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2817 If the wrong kind of type is found, an error is reported. */
2820 lookup_tag (code, name, binding_level, thislevel_only)
2821 enum tree_code code;
2822 struct binding_level *binding_level;
2826 register struct binding_level *level;
2829 for (level = binding_level; level; level = level->level_chain)
2832 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2834 if (TREE_PURPOSE (tail) == name)
2836 if (TREE_CODE (TREE_VALUE (tail)) != code)
2838 /* Definition isn't the kind we were looking for. */
2839 pending_invalid_xref = name;
2840 pending_invalid_xref_file = input_filename;
2841 pending_invalid_xref_line = lineno;
2842 /* If in the same binding level as a declaration as a tag
2843 of a different type, this must not be allowed to
2844 shadow that tag, so give the error immediately.
2845 (For example, "struct foo; union foo;" is invalid.) */
2847 pending_xref_error ();
2849 return TREE_VALUE (tail);
2852 if (! level->tag_transparent)
2862 /* Print an error message now
2863 for a recent invalid struct, union or enum cross reference.
2864 We don't print them immediately because they are not invalid
2865 when used in the `struct foo;' construct for shadowing. */
2868 pending_xref_error ()
2870 if (pending_invalid_xref != 0)
2871 error_with_file_and_line (pending_invalid_xref_file,
2872 pending_invalid_xref_line,
2873 "`%s' defined as wrong kind of tag",
2874 IDENTIFIER_POINTER (pending_invalid_xref));
2875 pending_invalid_xref = 0;
2878 /* Given a type, find the tag that was defined for it and return the tag name.
2879 Otherwise return 0. */
2882 lookup_tag_reverse (type)
2885 register struct binding_level *level;
2887 for (level = current_binding_level; level; level = level->level_chain)
2890 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2892 if (TREE_VALUE (tail) == type)
2893 return TREE_PURPOSE (tail);
2899 /* Look up NAME in the current binding level and its superiors
2900 in the namespace of variables, functions and typedefs.
2901 Return a ..._DECL node of some kind representing its definition,
2902 or return 0 if it is undefined. */
2910 if (current_binding_level != global_binding_level
2911 && IDENTIFIER_LOCAL_VALUE (name))
2912 val = IDENTIFIER_LOCAL_VALUE (name);
2914 val = IDENTIFIER_GLOBAL_VALUE (name);
2918 /* Similar to `lookup_name' but look only at current binding level. */
2921 lookup_name_current_level (name)
2926 if (current_binding_level == global_binding_level)
2927 return IDENTIFIER_GLOBAL_VALUE (name);
2929 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2932 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2933 if (DECL_NAME (t) == name)
2939 /* Mark ARG for GC. */
2942 mark_binding_level (arg)
2945 struct binding_level *level = *(struct binding_level **) arg;
2947 for (; level != 0; level = level->level_chain)
2949 ggc_mark_tree (level->names);
2950 ggc_mark_tree (level->tags);
2951 ggc_mark_tree (level->shadowed);
2952 ggc_mark_tree (level->blocks);
2953 ggc_mark_tree (level->this_block);
2954 ggc_mark_tree (level->parm_order);
2958 /* Create the predefined scalar types of C,
2959 and some nodes representing standard constants (0, 1, (void *) 0).
2960 Initialize the global binding level.
2961 Make definitions for built-in primitive functions. */
2964 init_decl_processing ()
2966 register tree endlink;
2967 tree ptr_ftype_void, ptr_ftype_ptr;
2969 current_function_decl = NULL;
2970 named_labels = NULL;
2971 current_binding_level = NULL_BINDING_LEVEL;
2972 free_binding_level = NULL_BINDING_LEVEL;
2974 /* Make the binding_level structure for global names. */
2976 global_binding_level = current_binding_level;
2978 build_common_tree_nodes (flag_signed_char);
2980 c_common_nodes_and_builtins ();
2982 boolean_type_node = integer_type_node;
2983 boolean_true_node = integer_one_node;
2984 boolean_false_node = integer_zero_node;
2986 /* With GCC, C99's _Bool is always of size 1. */
2987 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2988 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2989 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2990 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2991 TYPE_PRECISION (c_bool_type_node) = 1;
2992 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2994 c_bool_false_node = build_int_2 (0, 0);
2995 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2996 c_bool_true_node = build_int_2 (1, 0);
2997 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2999 endlink = void_list_node;
3000 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3002 = build_function_type (ptr_type_node,
3003 tree_cons (NULL_TREE, ptr_type_node, endlink));
3005 /* Types which are common to the fortran compiler and libf2c. When
3006 changing these, you also need to be concerned with f/com.h. */
3008 if (TYPE_PRECISION (float_type_node)
3009 == TYPE_PRECISION (long_integer_type_node))
3011 g77_integer_type_node = long_integer_type_node;
3012 g77_uinteger_type_node = long_unsigned_type_node;
3014 else if (TYPE_PRECISION (float_type_node)
3015 == TYPE_PRECISION (integer_type_node))
3017 g77_integer_type_node = integer_type_node;
3018 g77_uinteger_type_node = unsigned_type_node;
3021 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3023 if (g77_integer_type_node != NULL_TREE)
3025 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3026 g77_integer_type_node));
3027 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3028 g77_uinteger_type_node));
3031 if (TYPE_PRECISION (float_type_node) * 2
3032 == TYPE_PRECISION (long_integer_type_node))
3034 g77_longint_type_node = long_integer_type_node;
3035 g77_ulongint_type_node = long_unsigned_type_node;
3037 else if (TYPE_PRECISION (float_type_node) * 2
3038 == TYPE_PRECISION (long_long_integer_type_node))
3040 g77_longint_type_node = long_long_integer_type_node;
3041 g77_ulongint_type_node = long_long_unsigned_type_node;
3044 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3046 if (g77_longint_type_node != NULL_TREE)
3048 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3049 g77_longint_type_node));
3050 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3051 g77_ulongint_type_node));
3054 pedantic_lvalues = pedantic;
3056 make_fname_decl = c_make_fname_decl;
3057 start_fname_decls ();
3059 /* Prepare to check format strings against argument lists. */
3060 init_function_format_info ();
3062 incomplete_decl_finalize_hook = finish_incomplete_decl;
3064 /* Record our roots. */
3066 ggc_add_tree_root (c_global_trees, CTI_MAX);
3067 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3068 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3069 ggc_add_tree_root (&named_labels, 1);
3070 ggc_add_tree_root (&shadowed_labels, 1);
3071 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3072 mark_binding_level);
3073 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3074 mark_binding_level);
3075 ggc_add_tree_root (&static_ctors, 1);
3076 ggc_add_tree_root (&static_dtors, 1);
3079 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3080 decl, NAME is the initialization string and TYPE_DEP indicates whether
3081 NAME depended on the type of the function. As we don't yet implement
3082 delayed emission of static data, we mark the decl as emitted
3083 so it is not placed in the output. Anything using it must therefore pull
3084 out the STRING_CST initializer directly. This does mean that these names
3085 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3088 c_make_fname_decl (id, type_dep)
3092 const char *name = fname_as_string (type_dep);
3093 tree decl, type, init;
3094 size_t length = strlen (name);
3096 type = build_array_type
3097 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3098 build_index_type (size_int (length)));
3100 decl = build_decl (VAR_DECL, id, type);
3101 /* We don't push the decl, so have to set its context here. */
3102 DECL_CONTEXT (decl) = current_function_decl;
3104 TREE_STATIC (decl) = 1;
3105 TREE_READONLY (decl) = 1;
3106 DECL_ARTIFICIAL (decl) = 1;
3108 init = build_string (length + 1, name);
3109 TREE_TYPE (init) = type;
3110 DECL_INITIAL (decl) = init;
3112 TREE_USED (decl) = 1;
3114 finish_decl (decl, init, NULL_TREE);
3119 /* Return a definition for a builtin function named NAME and whose data type
3120 is TYPE. TYPE should be a function type with argument types.
3121 FUNCTION_CODE tells later passes how to compile calls to this function.
3122 See tree.h for its possible values.
3124 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3125 the name to be called if we can't opencode the function. */
3128 builtin_function (name, type, function_code, class, library_name)
3132 enum built_in_class class;
3133 const char *library_name;
3135 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3136 DECL_EXTERNAL (decl) = 1;
3137 TREE_PUBLIC (decl) = 1;
3138 /* If -traditional, permit redefining a builtin function any way you like.
3139 (Though really, if the program redefines these functions,
3140 it probably won't work right unless compiled with -fno-builtin.) */
3141 if (flag_traditional && name[0] != '_')
3142 DECL_BUILT_IN_NONANSI (decl) = 1;
3144 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3145 make_decl_rtl (decl, NULL);
3147 DECL_BUILT_IN_CLASS (decl) = class;
3148 DECL_FUNCTION_CODE (decl) = function_code;
3150 /* Warn if a function in the namespace for users
3151 is used without an occasion to consider it declared. */
3152 if (name[0] != '_' || name[1] != '_')
3153 C_DECL_ANTICIPATED (decl) = 1;
3158 /* Called when a declaration is seen that contains no names to declare.
3159 If its type is a reference to a structure, union or enum inherited
3160 from a containing scope, shadow that tag name for the current scope
3161 with a forward reference.
3162 If its type defines a new named structure or union
3163 or defines an enum, it is valid but we need not do anything here.
3164 Otherwise, it is an error. */
3167 shadow_tag (declspecs)
3170 shadow_tag_warned (declspecs, 0);
3174 shadow_tag_warned (declspecs, warned)
3177 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3184 pending_invalid_xref = 0;
3186 /* Remove the attributes from declspecs, since they will confuse the
3188 split_specs_attrs (declspecs, &specs, &attrs);
3190 for (link = specs; link; link = TREE_CHAIN (link))
3192 register tree value = TREE_VALUE (link);
3193 register enum tree_code code = TREE_CODE (value);
3195 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3196 /* Used to test also that TYPE_SIZE (value) != 0.
3197 That caused warning for `struct foo;' at top level in the file. */
3199 register tree name = lookup_tag_reverse (value);
3206 if (warned != 1 && code != ENUMERAL_TYPE)
3207 /* Empty unnamed enum OK */
3209 pedwarn ("unnamed struct/union that defines no instances");
3215 t = lookup_tag (code, name, current_binding_level, 1);
3219 t = make_node (code);
3226 if (!warned && ! in_system_header)
3228 warning ("useless keyword or type name in empty declaration");
3235 error ("two types specified in one empty declaration");
3240 pedwarn ("empty declaration");
3244 /* Construct an array declarator. EXPR is the expression inside [], or
3245 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3246 to the pointer to which a parameter array is converted). STATIC_P is
3247 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3248 is non-zero is the array is [*], a VLA of unspecified length which is
3249 nevertheless a complete type (not currently implemented by GCC),
3250 zero otherwise. The declarator is constructed as an ARRAY_REF
3251 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3252 left of the [] (filled by in set_array_declarator_type) and operand 1
3253 is the expression inside; whose TREE_TYPE is the type qualifiers and
3254 which has TREE_STATIC set if "static" is used. */
3257 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3264 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3265 TREE_TYPE (decl) = quals;
3266 TREE_STATIC (decl) = (static_p ? 1 : 0);
3267 if (pedantic && !flag_isoc99)
3269 if (static_p || quals != NULL_TREE)
3270 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3272 pedwarn ("ISO C89 does not support `[*]' array declarators");
3275 warning ("GCC does not yet properly implement `[*]' array declarators");
3279 /* Set the type of an array declarator. DECL is the declarator, as
3280 constructed by build_array_declarator; TYPE is what appears on the left
3281 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3282 abstract declarator, zero otherwise; this is used to reject static and
3283 type qualifiers in abstract declarators, where they are not in the
3287 set_array_declarator_type (decl, type, abstract_p)
3292 TREE_OPERAND (decl, 0) = type;
3293 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3294 error ("static or type qualifiers in abstract declarator");
3298 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3301 groktypename (typename)
3304 if (TREE_CODE (typename) != TREE_LIST)
3306 return grokdeclarator (TREE_VALUE (typename),
3307 TREE_PURPOSE (typename),
3311 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3314 groktypename_in_parm_context (typename)
3317 if (TREE_CODE (typename) != TREE_LIST)
3319 return grokdeclarator (TREE_VALUE (typename),
3320 TREE_PURPOSE (typename),
3324 /* Decode a declarator in an ordinary declaration or data definition.
3325 This is called as soon as the type information and variable name
3326 have been parsed, before parsing the initializer if any.
3327 Here we create the ..._DECL node, fill in its type,
3328 and put it on the list of decls for the current context.
3329 The ..._DECL node is returned as the value.
3331 Exception: for arrays where the length is not specified,
3332 the type is left null, to be filled in by `finish_decl'.
3334 Function definitions do not come here; they go to start_function
3335 instead. However, external and forward declarations of functions
3336 do go through here. Structure field declarations are done by
3337 grokfield and not through here. */
3340 start_decl (declarator, declspecs, initialized, attributes)
3341 tree declarator, declspecs;
3345 tree decl = grokdeclarator (declarator, declspecs,
3346 NORMAL, initialized);
3349 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3350 && MAIN_NAME_P (DECL_NAME (decl)))
3351 warning_with_decl (decl, "`%s' is usually a function");
3354 /* Is it valid for this decl to have an initializer at all?
3355 If not, set INITIALIZED to zero, which will indirectly
3356 tell `finish_decl' to ignore the initializer once it is parsed. */
3357 switch (TREE_CODE (decl))
3360 /* typedef foo = bar means give foo the same type as bar.
3361 We haven't parsed bar yet, so `finish_decl' will fix that up.
3362 Any other case of an initialization in a TYPE_DECL is an error. */
3363 if (pedantic || list_length (declspecs) > 1)
3365 error ("typedef `%s' is initialized",
3366 IDENTIFIER_POINTER (DECL_NAME (decl)));
3372 error ("function `%s' is initialized like a variable",
3373 IDENTIFIER_POINTER (DECL_NAME (decl)));
3378 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3379 error ("parameter `%s' is initialized",
3380 IDENTIFIER_POINTER (DECL_NAME (decl)));
3385 /* Don't allow initializations for incomplete types
3386 except for arrays which might be completed by the initialization. */
3388 /* This can happen if the array size is an undefined macro. We already
3389 gave a warning, so we don't need another one. */
3390 if (TREE_TYPE (decl) == error_mark_node)
3392 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3394 /* A complete type is ok if size is fixed. */
3396 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3397 || C_DECL_VARIABLE_SIZE (decl))
3399 error ("variable-sized object may not be initialized");
3403 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3405 error ("variable `%s' has initializer but incomplete type",
3406 IDENTIFIER_POINTER (DECL_NAME (decl)));
3409 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3411 error ("elements of array `%s' have incomplete type",
3412 IDENTIFIER_POINTER (DECL_NAME (decl)));
3420 /* Seems redundant with grokdeclarator. */
3421 if (current_binding_level != global_binding_level
3422 && DECL_EXTERNAL (decl)
3423 && TREE_CODE (decl) != FUNCTION_DECL)
3424 warning ("declaration of `%s' has `extern' and is initialized",
3425 IDENTIFIER_POINTER (DECL_NAME (decl)));
3427 DECL_EXTERNAL (decl) = 0;
3428 if (current_binding_level == global_binding_level)
3429 TREE_STATIC (decl) = 1;
3431 /* Tell `pushdecl' this is an initialized decl
3432 even though we don't yet have the initializer expression.
3433 Also tell `finish_decl' it may store the real initializer. */
3434 DECL_INITIAL (decl) = error_mark_node;
3437 /* If this is a function declaration, write a record describing it to the
3438 prototypes file (if requested). */
3440 if (TREE_CODE (decl) == FUNCTION_DECL)
3441 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3443 /* ANSI specifies that a tentative definition which is not merged with
3444 a non-tentative definition behaves exactly like a definition with an
3445 initializer equal to zero. (Section 3.7.2)
3446 -fno-common gives strict ANSI behavior. Usually you don't want it.
3447 This matters only for variables with external linkage. */
3448 if (! flag_no_common || ! TREE_PUBLIC (decl))
3449 DECL_COMMON (decl) = 1;
3451 /* Set attributes here so if duplicate decl, will have proper attributes. */
3452 decl_attributes (&decl, attributes, 0);
3454 /* Add this decl to the current binding level.
3455 TEM may equal DECL or it may be a previous decl of the same name. */
3456 tem = pushdecl (decl);
3458 /* For a local variable, define the RTL now. */
3459 if (current_binding_level != global_binding_level
3460 /* But not if this is a duplicate decl
3461 and we preserved the rtl from the previous one
3462 (which may or may not happen). */
3463 && !DECL_RTL_SET_P (tem)
3464 && !DECL_CONTEXT (tem))
3466 if (TREE_TYPE (tem) != error_mark_node
3467 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3469 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3470 && DECL_INITIAL (tem) != 0)
3477 /* Finish processing of a declaration;
3478 install its initial value.
3479 If the length of an array type is not known before,
3480 it must be determined now, from the initial value, or it is an error. */
3483 finish_decl (decl, init, asmspec_tree)
3487 register tree type = TREE_TYPE (decl);
3488 int was_incomplete = (DECL_SIZE (decl) == 0);
3489 const char *asmspec = 0;
3491 /* If a name was specified, get the string. */
3493 asmspec = TREE_STRING_POINTER (asmspec_tree);
3495 /* If `start_decl' didn't like having an initialization, ignore it now. */
3496 if (init != 0 && DECL_INITIAL (decl) == 0)
3499 /* Don't crash if parm is initialized. */
3500 if (TREE_CODE (decl) == PARM_DECL)
3505 if (TREE_CODE (decl) != TYPE_DECL)
3506 store_init_value (decl, init);
3509 /* typedef foo = bar; store the type of bar as the type of foo. */
3510 TREE_TYPE (decl) = TREE_TYPE (init);
3511 DECL_INITIAL (decl) = init = 0;
3515 /* Deduce size of array from initialization, if not already known */
3516 if (TREE_CODE (type) == ARRAY_TYPE
3517 && TYPE_DOMAIN (type) == 0
3518 && TREE_CODE (decl) != TYPE_DECL)
3521 = (TREE_STATIC (decl)
3522 /* Even if pedantic, an external linkage array
3523 may have incomplete type at first. */
3524 ? pedantic && !TREE_PUBLIC (decl)
3525 : !DECL_EXTERNAL (decl));
3527 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3529 /* Get the completed type made by complete_array_type. */
3530 type = TREE_TYPE (decl);
3533 error_with_decl (decl, "initializer fails to determine size of `%s'");
3535 else if (failure == 2)
3538 error_with_decl (decl, "array size missing in `%s'");
3539 /* If a `static' var's size isn't known,
3540 make it extern as well as static, so it does not get
3542 If it is not `static', then do not mark extern;
3543 finish_incomplete_decl will give it a default size
3544 and it will get allocated. */
3545 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3546 DECL_EXTERNAL (decl) = 1;
3549 /* TYPE_MAX_VALUE is always one less than the number of elements
3550 in the array, because we start counting at zero. Therefore,
3551 warn only if the value is less than zero. */
3552 else if (pedantic && TYPE_DOMAIN (type) != 0
3553 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3554 error_with_decl (decl, "zero or negative size array `%s'");
3556 layout_decl (decl, 0);
3559 if (TREE_CODE (decl) == VAR_DECL)
3561 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3562 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3563 layout_decl (decl, 0);
3565 if (DECL_SIZE (decl) == 0
3566 /* Don't give an error if we already gave one earlier. */
3567 && TREE_TYPE (decl) != error_mark_node
3568 && (TREE_STATIC (decl)
3570 /* A static variable with an incomplete type
3571 is an error if it is initialized.
3572 Also if it is not file scope.
3573 Otherwise, let it through, but if it is not `extern'
3574 then it may cause an error message later. */
3575 (DECL_INITIAL (decl) != 0
3576 || DECL_CONTEXT (decl) != 0)
3578 /* An automatic variable with an incomplete type
3580 !DECL_EXTERNAL (decl)))
3582 error_with_decl (decl, "storage size of `%s' isn't known");
3583 TREE_TYPE (decl) = error_mark_node;
3586 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3587 && DECL_SIZE (decl) != 0)
3589 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3590 constant_expression_warning (DECL_SIZE (decl));
3592 error_with_decl (decl, "storage size of `%s' isn't constant");
3595 if (TREE_USED (type))
3596 TREE_USED (decl) = 1;
3599 /* If this is a function and an assembler name is specified, it isn't
3600 builtin any more. Also reset DECL_RTL so we can give it its new
3602 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3604 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3605 SET_DECL_RTL (decl, NULL_RTX);
3606 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3609 /* Output the assembler code and/or RTL code for variables and functions,
3610 unless the type is an undefined structure or union.
3611 If not, it will get done when the type is completed. */
3613 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3615 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3616 maybe_objc_check_decl (decl);
3618 if (!DECL_CONTEXT (decl))
3620 if (DECL_INITIAL (decl) == NULL_TREE
3621 || DECL_INITIAL (decl) == error_mark_node)
3622 /* Don't output anything
3623 when a tentative file-scope definition is seen.
3624 But at end of compilation, do output code for them. */
3625 DECL_DEFER_OUTPUT (decl) = 1;
3626 rest_of_decl_compilation (decl, asmspec,
3627 (DECL_CONTEXT (decl) == 0
3628 || TREE_ASM_WRITTEN (decl)), 0);
3632 /* This is a local variable. If there is an ASMSPEC, the
3633 user has requested that we handle it specially. */
3636 /* In conjunction with an ASMSPEC, the `register'
3637 keyword indicates that we should place the variable
3638 in a particular register. */
3639 if (DECL_REGISTER (decl))
3640 DECL_C_HARD_REGISTER (decl) = 1;
3642 /* If this is not a static variable, issue a warning.
3643 It doesn't make any sense to give an ASMSPEC for an
3644 ordinary, non-register local variable. Historically,
3645 GCC has accepted -- but ignored -- the ASMSPEC in
3647 if (TREE_CODE (decl) == VAR_DECL
3648 && !DECL_REGISTER (decl)
3649 && !TREE_STATIC (decl))
3650 warning_with_decl (decl,
3651 "ignoring asm-specifier for non-static local variable `%s'");
3653 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3656 add_decl_stmt (decl);
3659 if (DECL_CONTEXT (decl) != 0)
3661 /* Recompute the RTL of a local array now
3662 if it used to be an incomplete type. */
3664 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3666 /* If we used it already as memory, it must stay in memory. */
3667 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3668 /* If it's still incomplete now, no init will save it. */
3669 if (DECL_SIZE (decl) == 0)
3670 DECL_INITIAL (decl) = 0;
3675 if (TREE_CODE (decl) == TYPE_DECL)
3677 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3678 maybe_objc_check_decl (decl);
3679 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3682 /* At the end of a declaration, throw away any variable type sizes
3683 of types defined inside that declaration. There is no use
3684 computing them in the following function definition. */
3685 if (current_binding_level == global_binding_level)
3686 get_pending_sizes ();
3689 /* If DECL has a cleanup, build and return that cleanup here.
3690 This is a callback called by expand_expr. */
3693 maybe_build_cleanup (decl)
3694 tree decl ATTRIBUTE_UNUSED;
3696 /* There are no cleanups in C. */
3700 /* Given a parsed parameter declaration,
3701 decode it into a PARM_DECL and push that on the current binding level.
3702 Also, for the sake of forward parm decls,
3703 record the given order of parms in `parm_order'. */
3706 push_parm_decl (parm)
3710 int old_immediate_size_expand = immediate_size_expand;
3711 /* Don't try computing parm sizes now -- wait till fn is called. */
3712 immediate_size_expand = 0;
3714 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3715 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3716 decl_attributes (&decl, TREE_VALUE (parm), 0);
3719 if (DECL_NAME (decl))
3722 olddecl = lookup_name (DECL_NAME (decl));
3723 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3724 pedwarn_with_decl (decl,
3725 "ANSI C forbids parameter `%s' shadowing typedef");
3729 decl = pushdecl (decl);
3731 immediate_size_expand = old_immediate_size_expand;
3733 current_binding_level->parm_order
3734 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3736 /* Add this decl to the current binding level. */
3737 finish_decl (decl, NULL_TREE, NULL_TREE);
3740 /* Clear the given order of parms in `parm_order'.
3741 Used at start of parm list,
3742 and also at semicolon terminating forward decls. */
3747 current_binding_level->parm_order = NULL_TREE;
3750 /* Make TYPE a complete type based on INITIAL_VALUE.
3751 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3752 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3755 complete_array_type (type, initial_value, do_default)
3760 register tree maxindex = NULL_TREE;
3765 /* Note MAXINDEX is really the maximum index,
3766 one less than the size. */
3767 if (TREE_CODE (initial_value) == STRING_CST)
3770 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3771 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3774 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3776 tree elts = CONSTRUCTOR_ELTS (initial_value);
3777 maxindex = build_int_2 (-1, -1);
3778 for (; elts; elts = TREE_CHAIN (elts))
3780 if (TREE_PURPOSE (elts))
3781 maxindex = TREE_PURPOSE (elts);
3783 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3784 maxindex, integer_one_node));
3786 maxindex = copy_node (maxindex);
3790 /* Make an error message unless that happened already. */
3791 if (initial_value != error_mark_node)
3794 /* Prevent further error messages. */
3795 maxindex = build_int_2 (0, 0);
3802 maxindex = build_int_2 (0, 0);
3808 TYPE_DOMAIN (type) = build_index_type (maxindex);
3809 if (!TREE_TYPE (maxindex))
3810 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3813 /* Lay out the type now that we can get the real answer. */
3820 /* Given declspecs and a declarator,
3821 determine the name and type of the object declared
3822 and construct a ..._DECL node for it.
3823 (In one case we can return a ..._TYPE node instead.
3824 For invalid input we sometimes return 0.)
3826 DECLSPECS is a chain of tree_list nodes whose value fields
3827 are the storage classes and type specifiers.
3829 DECL_CONTEXT says which syntactic context this declaration is in:
3830 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3831 FUNCDEF for a function definition. Like NORMAL but a few different
3832 error messages in each case. Return value may be zero meaning
3833 this definition is too screwy to try to parse.
3834 PARM for a parameter declaration (either within a function prototype
3835 or before a function body). Make a PARM_DECL, or return void_type_node.
3836 TYPENAME if for a typename (in a cast or sizeof).
3837 Don't make a DECL node; just return the ..._TYPE node.
3838 FIELD for a struct or union field; make a FIELD_DECL.
3839 BITFIELD for a field with specified width.
3840 INITIALIZED is 1 if the decl has an initializer.
3842 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3843 It may also be so in the PARM case, for a prototype where the
3844 argument type is specified but not the name.
3846 This function is where the complicated C meanings of `static'
3847 and `extern' are interpreted. */
3850 grokdeclarator (declarator, declspecs, decl_context, initialized)
3853 enum decl_context decl_context;
3858 tree type = NULL_TREE;
3863 int type_quals = TYPE_UNQUALIFIED;
3865 int explicit_int = 0;
3866 int explicit_char = 0;
3867 int defaulted_int = 0;
3868 tree typedef_decl = 0;
3870 tree typedef_type = 0;
3871 int funcdef_flag = 0;
3872 enum tree_code innermost_code = ERROR_MARK;
3874 int size_varies = 0;
3875 tree decl_attr = NULL_TREE;
3876 tree array_ptr_quals = NULL_TREE;
3877 int array_parm_static = 0;
3878 tree returned_attrs = NULL_TREE;
3880 if (decl_context == BITFIELD)
3881 bitfield = 1, decl_context = FIELD;
3883 if (decl_context == FUNCDEF)
3884 funcdef_flag = 1, decl_context = NORMAL;
3886 /* Look inside a declarator for the name being declared
3887 and get it as a string, for an error message. */
3889 register tree decl = declarator;
3893 switch (TREE_CODE (decl))
3898 innermost_code = TREE_CODE (decl);
3899 decl = TREE_OPERAND (decl, 0);
3903 decl = TREE_VALUE (decl);
3906 case IDENTIFIER_NODE:
3907 name = IDENTIFIER_POINTER (decl);
3918 /* A function definition's declarator must have the form of
3919 a function declarator. */
3921 if (funcdef_flag && innermost_code != CALL_EXPR)
3924 /* Anything declared one level down from the top level
3925 must be one of the parameters of a function
3926 (because the body is at least two levels down). */
3928 /* If this looks like a function definition, make it one,
3929 even if it occurs where parms are expected.
3930 Then store_parm_decls will reject it and not use it as a parm. */
3931 if (decl_context == NORMAL && !funcdef_flag
3932 && current_binding_level->parm_flag)
3933 decl_context = PARM;
3935 /* Look through the decl specs and record which ones appear.
3936 Some typespecs are defined as built-in typenames.
3937 Others, the ones that are modifiers of other types,
3938 are represented by bits in SPECBITS: set the bits for
3939 the modifiers that appear. Storage class keywords are also in SPECBITS.
3941 If there is a typedef name or a type, store the type in TYPE.
3942 This includes builtin typedefs such as `int'.
3944 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3945 and did not come from a user typedef.
3947 Set LONGLONG if `long' is mentioned twice. */
3949 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3951 register tree id = TREE_VALUE (spec);
3953 if (id == ridpointers[(int) RID_INT])
3955 if (id == ridpointers[(int) RID_CHAR])
3958 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3960 enum rid i = C_RID_CODE (id);
3961 if ((int) i <= (int) RID_LAST_MODIFIER)
3963 if (i == RID_LONG && (specbits & (1 << (int) i)))
3966 error ("`long long long' is too long for GCC");
3969 if (pedantic && !flag_isoc99 && ! in_system_header
3971 pedwarn ("ISO C89 does not support `long long'");
3975 else if (specbits & (1 << (int) i))
3976 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3977 specbits |= 1 << (int) i;
3982 error ("two or more data types in declaration of `%s'", name);
3983 /* Actual typedefs come to us as TYPE_DECL nodes. */
3984 else if (TREE_CODE (id) == TYPE_DECL)
3986 type = TREE_TYPE (id);
3987 decl_attr = DECL_ATTRIBUTES (id);
3990 /* Built-in types come as identifiers. */
3991 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3993 register tree t = lookup_name (id);
3994 if (TREE_TYPE (t) == error_mark_node)
3996 else if (!t || TREE_CODE (t) != TYPE_DECL)
3997 error ("`%s' fails to be a typedef or built in type",
3998 IDENTIFIER_POINTER (id));
4001 type = TREE_TYPE (t);
4005 else if (TREE_CODE (id) != ERROR_MARK)
4012 typedef_type = type;
4014 size_varies = C_TYPE_VARIABLE_SIZE (type);
4016 /* No type at all: default to `int', and set DEFAULTED_INT
4017 because it was not a user-defined typedef. */
4021 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4022 | (1 << (int) RID_SIGNED)
4023 | (1 << (int) RID_UNSIGNED)
4024 | (1 << (int) RID_COMPLEX))))
4025 /* Don't warn about typedef foo = bar. */
4026 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4027 && ! in_system_header)
4029 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4030 and this is a function, or if -Wimplicit; prefer the former
4031 warning since it is more explicit. */
4032 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4034 warn_about_return_type = 1;
4035 else if (warn_implicit_int || flag_isoc99)
4036 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4041 type = integer_type_node;
4044 /* Now process the modifiers that were specified
4045 and check for invalid combinations. */
4047 /* Long double is a special combination. */
4049 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4050 && TYPE_MAIN_VARIANT (type) == double_type_node)
4052 specbits &= ~(1 << (int) RID_LONG);
4053 type = long_double_type_node;
4056 /* Check all other uses of type modifiers. */
4058 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4059 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4063 if ((specbits & 1 << (int) RID_LONG)
4064 && (specbits & 1 << (int) RID_SHORT))
4065 error ("both long and short specified for `%s'", name);
4066 else if (((specbits & 1 << (int) RID_LONG)
4067 || (specbits & 1 << (int) RID_SHORT))
4069 error ("long or short specified with char for `%s'", name);
4070 else if (((specbits & 1 << (int) RID_LONG)
4071 || (specbits & 1 << (int) RID_SHORT))
4072 && TREE_CODE (type) == REAL_TYPE)
4074 static int already = 0;
4076 error ("long or short specified with floating type for `%s'", name);
4077 if (! already && ! pedantic)
4079 error ("the only valid combination is `long double'");
4083 else if ((specbits & 1 << (int) RID_SIGNED)
4084 && (specbits & 1 << (int) RID_UNSIGNED))
4085 error ("both signed and unsigned specified for `%s'", name);
4086 else if (TREE_CODE (type) != INTEGER_TYPE)
4087 error ("long, short, signed or unsigned invalid for `%s'", name);
4091 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4093 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4095 if (flag_pedantic_errors)
4100 /* Discard the type modifiers if they are invalid. */
4103 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4104 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4109 if ((specbits & (1 << (int) RID_COMPLEX))
4110 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4112 error ("complex invalid for `%s'", name);
4113 specbits &= ~(1 << (int) RID_COMPLEX);
4116 /* Decide whether an integer type is signed or not.
4117 Optionally treat bitfields as signed by default. */
4118 if (specbits & 1 << (int) RID_UNSIGNED
4119 /* Traditionally, all bitfields are unsigned. */
4120 || (bitfield && flag_traditional
4121 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4122 || (bitfield && ! flag_signed_bitfields
4123 && (explicit_int || defaulted_int || explicit_char
4124 /* A typedef for plain `int' without `signed'
4125 can be controlled just like plain `int'. */
4126 || ! (typedef_decl != 0
4127 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4128 && TREE_CODE (type) != ENUMERAL_TYPE
4129 && !(specbits & 1 << (int) RID_SIGNED)))
4132 type = long_long_unsigned_type_node;
4133 else if (specbits & 1 << (int) RID_LONG)
4134 type = long_unsigned_type_node;
4135 else if (specbits & 1 << (int) RID_SHORT)
4136 type = short_unsigned_type_node;
4137 else if (type == char_type_node)
4138 type = unsigned_char_type_node;
4139 else if (typedef_decl)
4140 type = unsigned_type (type);
4142 type = unsigned_type_node;
4144 else if ((specbits & 1 << (int) RID_SIGNED)
4145 && type == char_type_node)
4146 type = signed_char_type_node;
4148 type = long_long_integer_type_node;
4149 else if (specbits & 1 << (int) RID_LONG)
4150 type = long_integer_type_node;
4151 else if (specbits & 1 << (int) RID_SHORT)
4152 type = short_integer_type_node;
4154 if (specbits & 1 << (int) RID_COMPLEX)
4156 if (pedantic && !flag_isoc99)
4157 pedwarn ("ISO C89 does not support complex types");
4158 /* If we just have "complex", it is equivalent to
4159 "complex double", but if any modifiers at all are specified it is
4160 the complex form of TYPE. E.g, "complex short" is
4161 "complex short int". */
4163 if (defaulted_int && ! longlong
4164 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4165 | (1 << (int) RID_SIGNED)
4166 | (1 << (int) RID_UNSIGNED))))
4169 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4170 type = complex_double_type_node;
4172 else if (type == integer_type_node)
4175 pedwarn ("ISO C does not support complex integer types");
4176 type = complex_integer_type_node;
4178 else if (type == float_type_node)
4179 type = complex_float_type_node;
4180 else if (type == double_type_node)
4181 type = complex_double_type_node;
4182 else if (type == long_double_type_node)
4183 type = complex_long_double_type_node;
4187 pedwarn ("ISO C does not support complex integer types");
4188 type = build_complex_type (type);
4192 /* Figure out the type qualifiers for the declaration. There are
4193 two ways a declaration can become qualified. One is something
4194 like `const int i' where the `const' is explicit. Another is
4195 something like `typedef const int CI; CI i' where the type of the
4196 declaration contains the `const'. */
4197 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4198 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4199 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4200 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4201 if (constp > 1 && ! flag_isoc99)
4202 pedwarn ("duplicate `const'");
4203 if (restrictp > 1 && ! flag_isoc99)
4204 pedwarn ("duplicate `restrict'");
4205 if (volatilep > 1 && ! flag_isoc99)
4206 pedwarn ("duplicate `volatile'");
4207 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4208 type = TYPE_MAIN_VARIANT (type);
4209 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4210 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4211 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4213 /* Warn if two storage classes are given. Default to `auto'. */
4218 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4219 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4220 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4221 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4222 if (specbits & 1 << (int) RID_TYPEDEF) 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'",
4258 error ("storage class specified for parameter `%s'", name);
4261 error ("storage class specified for typename");
4264 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4265 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4266 | (1 << (int) RID_EXTERN));
4269 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4271 /* `extern' with initialization is invalid if not at top level. */
4272 if (current_binding_level == global_binding_level)
4273 warning ("`%s' initialized and declared `extern'", name);
4275 error ("`%s' has both `extern' and initializer", name);
4277 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4278 && current_binding_level != global_binding_level)
4279 error ("nested function `%s' declared `extern'", name);
4280 else if (current_binding_level == global_binding_level
4281 && specbits & (1 << (int) RID_AUTO))
4282 error ("top-level declaration of `%s' specifies `auto'", name);
4285 /* Now figure out the structure of the declarator proper.
4286 Descend through it, creating more complex types, until we reach
4287 the declared identifier (or NULL_TREE, in an absolute declarator). */
4289 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4291 if (type == error_mark_node)
4293 declarator = TREE_OPERAND (declarator, 0);
4297 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4298 an INDIRECT_REF (for *...),
4299 a CALL_EXPR (for ...(...)),
4300 a TREE_LIST (for nested attributes),
4301 an identifier (for the name being declared)
4302 or a null pointer (for the place in an absolute declarator
4303 where the name was omitted).
4304 For the last two cases, we have just exited the loop.
4306 At this point, TYPE is the type of elements of an array,
4307 or for a function to return, or for a pointer to point to.
4308 After this sequence of ifs, TYPE is the type of the
4309 array or function or pointer, and DECLARATOR has had its
4310 outermost layer removed. */
4312 if (array_ptr_quals != NULL_TREE || array_parm_static)
4314 /* Only the innermost declarator (making a parameter be of
4315 array type which is converted to pointer type)
4316 may have static or type qualifiers. */
4317 error ("static or type qualifiers in non-parameter array declarator");
4318 array_ptr_quals = NULL_TREE;
4319 array_parm_static = 0;
4322 if (TREE_CODE (declarator) == TREE_LIST)
4324 /* We encode a declarator with embedded attributes using
4326 tree attrs = TREE_PURPOSE (declarator);
4329 declarator = TREE_VALUE (declarator);
4330 inner_decl = declarator;
4331 while (inner_decl != NULL_TREE
4332 && TREE_CODE (inner_decl) == TREE_LIST)
4333 inner_decl = TREE_VALUE (inner_decl);
4334 if (inner_decl == NULL_TREE
4335 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4336 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4337 if (TREE_CODE (inner_decl) == CALL_EXPR)
4338 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4339 if (TREE_CODE (inner_decl) == ARRAY_REF)
4340 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4341 returned_attrs = decl_attributes (&type,
4342 chainon (returned_attrs, attrs),
4345 else if (TREE_CODE (declarator) == ARRAY_REF)
4347 register tree itype = NULL_TREE;
4348 register tree size = TREE_OPERAND (declarator, 1);
4349 /* The index is a signed object `sizetype' bits wide. */
4350 tree index_type = signed_type (sizetype);
4352 array_ptr_quals = TREE_TYPE (declarator);
4353 array_parm_static = TREE_STATIC (declarator);
4355 declarator = TREE_OPERAND (declarator, 0);
4357 /* Check for some types that there cannot be arrays of. */
4359 if (VOID_TYPE_P (type))
4361 error ("declaration of `%s' as array of voids", name);
4362 type = error_mark_node;
4365 if (TREE_CODE (type) == FUNCTION_TYPE)
4367 error ("declaration of `%s' as array of functions", name);
4368 type = error_mark_node;
4371 if (size == error_mark_node)
4372 type = error_mark_node;
4374 if (type == error_mark_node)
4377 /* If size was specified, set ITYPE to a range-type for that size.
4378 Otherwise, ITYPE remains null. finish_decl may figure it out
4379 from an initial value. */
4383 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4384 STRIP_TYPE_NOPS (size);
4386 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4388 error ("size of array `%s' has non-integer type", name);
4389 size = integer_one_node;
4392 if (pedantic && integer_zerop (size))
4393 pedwarn ("ISO C forbids zero-size array `%s'", name);
4395 if (TREE_CODE (size) == INTEGER_CST)
4397 constant_expression_warning (size);
4398 if (tree_int_cst_sgn (size) < 0)
4400 error ("size of array `%s' is negative", name);
4401 size = integer_one_node;
4406 /* Make sure the array size remains visibly nonconstant
4407 even if it is (eg) a const variable with known value. */
4412 if (TREE_CONSTANT (size))
4413 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4416 pedwarn ("ISO C89 forbids variable-size array `%s'",
4421 if (integer_zerop (size))
4423 /* A zero-length array cannot be represented with an
4424 unsigned index type, which is what we'll get with
4425 build_index_type. Create an open-ended range instead. */
4426 itype = build_range_type (sizetype, size, NULL_TREE);
4430 /* Compute the maximum valid index, that is, size - 1.
4431 Do the calculation in index_type, so that if it is
4432 a variable the computations will be done in the
4434 itype = fold (build (MINUS_EXPR, index_type,
4435 convert (index_type, size),
4436 convert (index_type, size_one_node)));
4438 /* If that overflowed, the array is too big.
4439 ??? While a size of INT_MAX+1 technically shouldn't
4440 cause an overflow (because we subtract 1), the overflow
4441 is recorded during the conversion to index_type, before
4442 the subtraction. Handling this case seems like an
4443 unnecessary complication. */
4444 if (TREE_OVERFLOW (itype))
4446 error ("size of array `%s' is too large", name);
4447 type = error_mark_node;
4452 itype = variable_size (itype);
4453 itype = build_index_type (itype);
4456 else if (decl_context == FIELD)
4458 /* ??? Need to check somewhere that this is a structure
4459 and not a union, that this field is last, and that
4460 this structure has at least one other named member. */
4462 if (pedantic && !flag_isoc99 && !in_system_header)
4463 pedwarn ("ISO C89 does not support flexible array members");
4465 /* ISO C99 Flexible array members are effectively identical
4466 to GCC's zero-length array extension. */
4467 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4470 /* If pedantic, complain about arrays of incomplete types. */
4472 if (pedantic && !COMPLETE_TYPE_P (type))
4473 pedwarn ("array type has incomplete element type");
4476 /* We shouldn't have a function type here at all!
4477 Functions aren't allowed as array elements. */
4478 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4479 && (constp || volatilep))
4480 pedwarn ("ANSI C forbids const or volatile function types");
4483 /* Build the array type itself, then merge any constancy or
4484 volatility into the target type. We must do it in this order
4485 to ensure that the TYPE_MAIN_VARIANT field of the array type
4486 is set correctly. */
4488 type = build_array_type (type, itype);
4490 type = c_build_qualified_type (type, type_quals);
4493 C_TYPE_VARIABLE_SIZE (type) = 1;
4495 /* The GCC extension for zero-length arrays differs from
4496 ISO flexible array members in that sizeof yields zero. */
4497 if (size && integer_zerop (size))
4500 TYPE_SIZE (type) = bitsize_zero_node;
4501 TYPE_SIZE_UNIT (type) = size_zero_node;
4503 if (decl_context != PARM
4504 && (array_ptr_quals != NULL_TREE || array_parm_static))
4506 error ("static or type qualifiers in non-parameter array declarator");
4507 array_ptr_quals = NULL_TREE;
4508 array_parm_static = 0;
4511 else if (TREE_CODE (declarator) == CALL_EXPR)
4515 /* Declaring a function type.
4516 Make sure we have a valid type for the function to return. */
4517 if (type == error_mark_node)
4522 /* Warn about some types functions can't return. */
4524 if (TREE_CODE (type) == FUNCTION_TYPE)
4526 error ("`%s' declared as function returning a function", name);
4527 type = integer_type_node;
4529 if (TREE_CODE (type) == ARRAY_TYPE)
4531 error ("`%s' declared as function returning an array", name);
4532 type = integer_type_node;
4535 #ifndef TRADITIONAL_RETURN_FLOAT
4536 /* Traditionally, declaring return type float means double. */
4538 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4539 type = double_type_node;
4540 #endif /* TRADITIONAL_RETURN_FLOAT */
4542 /* Construct the function type and go to the next
4543 inner layer of declarator. */
4545 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4547 /* Say it's a definition
4548 only for the CALL_EXPR
4549 closest to the identifier. */
4550 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4551 /* Type qualifiers before the return type of the function
4552 qualify the return type, not the function type. */
4555 /* Type qualifiers on a function return type are normally
4556 permitted by the standard but have no effect, so give a
4557 warning at -W. Qualifiers on a void return type have
4558 meaning as a GNU extension, and are banned on function
4559 definitions in ISO C. FIXME: strictly we shouldn't
4560 pedwarn for qualified void return types except on function
4561 definitions, but not doing so could lead to the undesirable
4562 state of a "volatile void" function return type not being
4563 warned about, and a use of the function being compiled
4564 with GNU semantics, with no diagnostics under -pedantic. */
4565 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4566 pedwarn ("ISO C forbids qualified void function return type");
4567 else if (extra_warnings
4568 && !(VOID_TYPE_P (type)
4569 && type_quals == TYPE_QUAL_VOLATILE))
4570 warning ("type qualifiers ignored on function return type");
4572 type = c_build_qualified_type (type, type_quals);
4574 type_quals = TYPE_UNQUALIFIED;
4576 type = build_function_type (type, arg_types);
4577 declarator = TREE_OPERAND (declarator, 0);
4579 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4580 the formal parameter list of this FUNCTION_TYPE to point to
4581 the FUNCTION_TYPE node itself. */
4586 for (link = last_function_parm_tags;
4588 link = TREE_CHAIN (link))
4589 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4592 else if (TREE_CODE (declarator) == INDIRECT_REF)
4594 /* Merge any constancy or volatility into the target type
4597 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4599 pedwarn ("ISO C forbids qualified function types");
4601 type = c_build_qualified_type (type, type_quals);
4602 type_quals = TYPE_UNQUALIFIED;
4605 type = build_pointer_type (type);
4607 /* Process a list of type modifier keywords
4608 (such as const or volatile) that were given inside the `*'. */
4610 if (TREE_TYPE (declarator))
4612 register tree typemodlist;
4618 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4619 typemodlist = TREE_CHAIN (typemodlist))
4621 tree qualifier = TREE_VALUE (typemodlist);
4623 if (C_IS_RESERVED_WORD (qualifier))
4625 if (C_RID_CODE (qualifier) == RID_CONST)
4627 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4629 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4639 error ("invalid type modifier within pointer declarator");
4640 if (constp > 1 && ! flag_isoc99)
4641 pedwarn ("duplicate `const'");
4642 if (volatilep > 1 && ! flag_isoc99)
4643 pedwarn ("duplicate `volatile'");
4644 if (restrictp > 1 && ! flag_isoc99)
4645 pedwarn ("duplicate `restrict'");
4647 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4648 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4649 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4652 declarator = TREE_OPERAND (declarator, 0);
4659 /* Now TYPE has the actual type. */
4661 /* Did array size calculations overflow? */
4663 if (TREE_CODE (type) == ARRAY_TYPE
4664 && COMPLETE_TYPE_P (type)
4665 && TREE_OVERFLOW (TYPE_SIZE (type)))
4667 error ("size of array `%s' is too large", name);
4668 /* If we proceed with the array type as it is, we'll eventully
4669 crash in tree_low_cst(). */
4670 type = error_mark_node;
4673 /* If this is declaring a typedef name, return a TYPE_DECL. */
4675 if (specbits & (1 << (int) RID_TYPEDEF))
4678 /* Note that the grammar rejects storage classes
4679 in typenames, fields or parameters */
4680 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4682 pedwarn ("ISO C forbids qualified function types");
4684 type = c_build_qualified_type (type, type_quals);
4685 decl = build_decl (TYPE_DECL, declarator, type);
4686 if ((specbits & (1 << (int) RID_SIGNED))
4687 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4688 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4689 decl_attributes (&decl, returned_attrs, 0);
4693 /* Detect the case of an array type of unspecified size
4694 which came, as such, direct from a typedef name.
4695 We must copy the type, so that each identifier gets
4696 a distinct type, so that each identifier's size can be
4697 controlled separately by its own initializer. */
4699 if (type != 0 && typedef_type != 0
4700 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4701 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4703 type = build_array_type (TREE_TYPE (type), 0);
4705 C_TYPE_VARIABLE_SIZE (type) = 1;
4708 /* If this is a type name (such as, in a cast or sizeof),
4709 compute the type and return it now. */
4711 if (decl_context == TYPENAME)
4713 /* Note that the grammar rejects storage classes
4714 in typenames, fields or parameters */
4715 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4717 pedwarn ("ISO C forbids const or volatile function types");
4719 type = c_build_qualified_type (type, type_quals);
4720 decl_attributes (&type, returned_attrs, 0);
4724 /* Aside from typedefs and type names (handle above),
4725 `void' at top level (not within pointer)
4726 is allowed only in public variables.
4727 We don't complain about parms either, but that is because
4728 a better error message can be made later. */
4730 if (VOID_TYPE_P (type) && decl_context != PARM
4731 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4732 && ((specbits & (1 << (int) RID_EXTERN))
4733 || (current_binding_level == global_binding_level
4735 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4737 error ("variable or field `%s' declared void", name);
4738 type = integer_type_node;
4741 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4742 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4747 if (decl_context == PARM)
4749 tree type_as_written;
4752 /* A parameter declared as an array of T is really a pointer to T.
4753 One declared as a function is really a pointer to a function. */
4755 if (TREE_CODE (type) == ARRAY_TYPE)
4757 /* Transfer const-ness of array into that of type pointed to. */
4758 type = TREE_TYPE (type);
4760 type = c_build_qualified_type (type, type_quals);
4761 type = build_pointer_type (type);
4762 type_quals = TYPE_UNQUALIFIED;
4763 if (array_ptr_quals)
4765 tree new_ptr_quals, new_ptr_attrs;
4767 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4768 /* We don't yet implement attributes in this context. */
4769 if (new_ptr_attrs != NULL_TREE)
4770 warning ("attributes in parameter array declarator ignored");
4775 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4777 tree qualifier = TREE_VALUE (new_ptr_quals);
4779 if (C_IS_RESERVED_WORD (qualifier))
4781 if (C_RID_CODE (qualifier) == RID_CONST)
4783 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4785 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4795 error ("invalid type modifier within array declarator");
4797 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4798 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4799 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4803 else if (TREE_CODE (type) == FUNCTION_TYPE)
4805 if (pedantic && type_quals)
4806 pedwarn ("ISO C forbids qualified function types");
4808 type = c_build_qualified_type (type, type_quals);
4809 type = build_pointer_type (type);
4810 type_quals = TYPE_UNQUALIFIED;
4812 else if (type_quals)
4813 type = c_build_qualified_type (type, type_quals);
4815 type_as_written = type;
4817 decl = build_decl (PARM_DECL, declarator, type);
4819 C_DECL_VARIABLE_SIZE (decl) = 1;
4821 /* Compute the type actually passed in the parmlist,
4822 for the case where there is no prototype.
4823 (For example, shorts and chars are passed as ints.)
4824 When there is a prototype, this is overridden later. */
4826 if (type == error_mark_node)
4827 promoted_type = type;
4830 promoted_type = simple_type_promotes_to (type);
4831 if (! promoted_type)
4832 promoted_type = type;
4835 DECL_ARG_TYPE (decl) = promoted_type;
4836 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4838 else if (decl_context == FIELD)
4840 /* Structure field. It may not be a function. */
4842 if (TREE_CODE (type) == FUNCTION_TYPE)
4844 error ("field `%s' declared as a function", name);
4845 type = build_pointer_type (type);
4847 else if (TREE_CODE (type) != ERROR_MARK
4848 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4850 error ("field `%s' has incomplete type", name);
4851 type = error_mark_node;
4853 /* Move type qualifiers down to element of an array. */
4854 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4856 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4858 TYPE_DOMAIN (type));
4860 /* Leave the field const or volatile as well. */
4861 type_quals = TYPE_UNQUALIFIED;
4864 decl = build_decl (FIELD_DECL, declarator, type);
4865 DECL_NONADDRESSABLE_P (decl) = bitfield;
4868 C_DECL_VARIABLE_SIZE (decl) = 1;
4870 else if (TREE_CODE (type) == FUNCTION_TYPE)
4872 /* Every function declaration is "external"
4873 except for those which are inside a function body
4874 in which `auto' is used.
4875 That is a case not specified by ANSI C,
4876 and we use it for forward declarations for nested functions. */
4877 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4878 || current_binding_level == global_binding_level);
4880 if (specbits & (1 << (int) RID_AUTO)
4881 && (pedantic || current_binding_level == global_binding_level))
4882 pedwarn ("invalid storage class for function `%s'", name);
4883 if (specbits & (1 << (int) RID_REGISTER))
4884 error ("invalid storage class for function `%s'", name);
4885 /* Function declaration not at top level.
4886 Storage classes other than `extern' are not allowed
4887 and `extern' makes no difference. */
4888 if (current_binding_level != global_binding_level
4889 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4891 pedwarn ("invalid storage class for function `%s'", name);
4893 decl = build_decl (FUNCTION_DECL, declarator, type);
4894 decl = build_decl_attribute_variant (decl, decl_attr);
4896 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4897 pedwarn ("ISO C forbids qualified function types");
4899 /* GNU C interprets a `volatile void' return type to indicate
4900 that the function does not return. */
4901 if ((type_quals & TYPE_QUAL_VOLATILE)
4902 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4903 warning ("`noreturn' function returns non-void value");
4906 DECL_EXTERNAL (decl) = 1;
4907 /* Record absence of global scope for `static' or `auto'. */
4909 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4911 /* Record presence of `inline', if it is reasonable. */
4914 if (MAIN_NAME_P (declarator))
4915 warning ("cannot inline function `main'");
4917 /* Assume that otherwise the function can be inlined. */
4918 DECL_INLINE (decl) = 1;
4920 if (specbits & (1 << (int) RID_EXTERN))
4921 current_extern_inline = 1;
4926 /* It's a variable. */
4927 /* An uninitialized decl with `extern' is a reference. */
4928 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4930 /* Move type qualifiers down to element of an array. */
4931 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4933 int saved_align = TYPE_ALIGN(type);
4934 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4936 TYPE_DOMAIN (type));
4937 TYPE_ALIGN (type) = saved_align;
4938 #if 0 /* Leave the variable const or volatile as well. */
4939 type_quals = TYPE_UNQUALIFIED;
4942 else if (type_quals)
4943 type = c_build_qualified_type (type, type_quals);
4945 decl = build_decl (VAR_DECL, declarator, type);
4947 C_DECL_VARIABLE_SIZE (decl) = 1;
4950 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4952 DECL_EXTERNAL (decl) = extern_ref;
4953 /* At top level, the presence of a `static' or `register' storage
4954 class specifier, or the absence of all storage class specifiers
4955 makes this declaration a definition (perhaps tentative). Also,
4956 the absence of both `static' and `register' makes it public. */
4957 if (current_binding_level == global_binding_level)
4961 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4962 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4964 /* Not at top level, only `static' makes a static definition. */
4967 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4968 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4972 /* Record `register' declaration for warnings on &
4973 and in case doing stupid register allocation. */
4975 if (specbits & (1 << (int) RID_REGISTER))
4976 DECL_REGISTER (decl) = 1;
4978 /* Record constancy and volatility. */
4979 c_apply_type_quals_to_decl (type_quals, decl);
4981 /* If a type has volatile components, it should be stored in memory.
4982 Otherwise, the fact that those components are volatile
4983 will be ignored, and would even crash the compiler. */
4984 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4985 mark_addressable (decl);
4987 decl_attributes (&decl, returned_attrs, 0);
4993 /* Decode the parameter-list info for a function type or function definition.
4994 The argument is the value returned by `get_parm_info' (or made in parse.y
4995 if there is an identifier list instead of a parameter decl list).
4996 These two functions are separate because when a function returns
4997 or receives functions then each is called multiple times but the order
4998 of calls is different. The last call to `grokparms' is always the one
4999 that contains the formal parameter names of a function definition.
5001 Store in `last_function_parms' a chain of the decls of parms.
5002 Also store in `last_function_parm_tags' a chain of the struct, union,
5003 and enum tags declared among the parms.
5005 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5007 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5008 a mere declaration. A nonempty identifier-list gets an error message
5009 when FUNCDEF_FLAG is zero. */
5012 grokparms (parms_info, funcdef_flag)
5016 tree first_parm = TREE_CHAIN (parms_info);
5018 last_function_parms = TREE_PURPOSE (parms_info);
5019 last_function_parm_tags = TREE_VALUE (parms_info);
5021 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5022 && !in_system_header)
5023 warning ("function declaration isn't a prototype");
5026 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5029 pedwarn ("parameter names (without types) in function declaration");
5031 last_function_parms = first_parm;
5038 /* We no longer test FUNCDEF_FLAG.
5039 If the arg types are incomplete in a declaration,
5040 they must include undefined tags.
5041 These tags can never be defined in the scope of the declaration,
5042 so the types can never be completed,
5043 and no call can be compiled successfully. */
5045 /* In a fcn definition, arg types must be complete. */
5048 for (parm = last_function_parms, typelt = first_parm;
5050 parm = TREE_CHAIN (parm))
5051 /* Skip over any enumeration constants declared here. */
5052 if (TREE_CODE (parm) == PARM_DECL)
5054 /* Barf if the parameter itself has an incomplete type. */
5055 tree type = TREE_VALUE (typelt);
5056 if (type == error_mark_node)
5058 if (!COMPLETE_TYPE_P (type))
5060 if (funcdef_flag && DECL_NAME (parm) != 0)
5061 error ("parameter `%s' has incomplete type",
5062 IDENTIFIER_POINTER (DECL_NAME (parm)));
5064 warning ("parameter has incomplete type");
5067 TREE_VALUE (typelt) = error_mark_node;
5068 TREE_TYPE (parm) = error_mark_node;
5072 /* This has been replaced by parm_tags_warning, which
5073 uses a more accurate criterion for what to warn
5077 /* Now warn if is a pointer to an incomplete type. */
5078 while (TREE_CODE (type) == POINTER_TYPE
5079 || TREE_CODE (type) == REFERENCE_TYPE)
5080 type = TREE_TYPE (type);
5081 type = TYPE_MAIN_VARIANT (type);
5082 if (!COMPLETE_TYPE_P (type))
5084 if (DECL_NAME (parm) != 0)
5085 warning ("parameter `%s' points to incomplete type",
5086 IDENTIFIER_POINTER (DECL_NAME (parm)));
5088 warning ("parameter points to incomplete type");
5092 typelt = TREE_CHAIN (typelt);
5099 /* Return a tree_list node with info on a parameter list just parsed.
5100 The TREE_PURPOSE is a chain of decls of those parms.
5101 The TREE_VALUE is a list of structure, union and enum tags defined.
5102 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5103 This tree_list node is later fed to `grokparms'.
5105 VOID_AT_END nonzero means append `void' to the end of the type-list.
5106 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5109 get_parm_info (void_at_end)
5112 register tree decl, t;
5113 register tree types = 0;
5115 tree tags = gettags ();
5116 tree parms = getdecls ();
5118 tree order = current_binding_level->parm_order;
5120 /* Just `void' (and no ellipsis) is special. There are really no parms.
5121 But if the `void' is qualified (by `const' or `volatile') or has a
5122 storage class specifier (`register'), then the behavior is undefined;
5123 by not counting it as the special case of `void' we will cause an
5124 error later. Typedefs for `void' are OK (see DR#157). */
5125 if (void_at_end && parms != 0
5126 && TREE_CHAIN (parms) == 0
5127 && VOID_TYPE_P (TREE_TYPE (parms))
5128 && ! TREE_THIS_VOLATILE (parms)
5129 && ! TREE_READONLY (parms)
5130 && ! DECL_REGISTER (parms)
5131 && DECL_NAME (parms) == 0)
5134 storedecls (NULL_TREE);
5135 return tree_cons (NULL_TREE, NULL_TREE,
5136 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5139 /* Extract enumerator values and other non-parms declared with the parms.
5140 Likewise any forward parm decls that didn't have real parm decls. */
5141 for (decl = parms; decl;)
5143 tree next = TREE_CHAIN (decl);
5145 if (TREE_CODE (decl) != PARM_DECL)
5147 TREE_CHAIN (decl) = new_parms;
5150 else if (TREE_ASM_WRITTEN (decl))
5152 error_with_decl (decl,
5153 "parameter `%s' has just a forward declaration");
5154 TREE_CHAIN (decl) = new_parms;
5160 /* Put the parm decls back in the order they were in in the parm list. */
5161 for (t = order; t; t = TREE_CHAIN (t))
5164 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5166 TREE_CHAIN (TREE_VALUE (t)) = 0;
5169 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5172 /* Store the parmlist in the binding level since the old one
5173 is no longer a valid list. (We have changed the chain pointers.) */
5174 storedecls (new_parms);
5176 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5177 /* There may also be declarations for enumerators if an enumeration
5178 type is declared among the parms. Ignore them here. */
5179 if (TREE_CODE (decl) == PARM_DECL)
5181 /* Since there is a prototype,
5182 args are passed in their declared types. */
5183 tree type = TREE_TYPE (decl);
5184 DECL_ARG_TYPE (decl) = type;
5185 if (PROMOTE_PROTOTYPES
5186 && INTEGRAL_TYPE_P (type)
5187 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5188 DECL_ARG_TYPE (decl) = integer_type_node;
5190 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5191 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5192 && DECL_NAME (decl) == 0)
5194 error ("`void' in parameter list must be the entire list");
5200 return tree_cons (new_parms, tags,
5201 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5203 return tree_cons (new_parms, tags, nreverse (types));
5206 /* At end of parameter list, warn about any struct, union or enum tags
5207 defined within. Do so because these types cannot ever become complete. */
5210 parmlist_tags_warning ()
5215 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5217 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5218 /* An anonymous union parm type is meaningful as a GNU extension.
5219 So don't warn for that. */
5220 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5222 if (TREE_PURPOSE (elt) != 0)
5223 warning ("`%s %s' declared inside parameter list",
5224 (code == RECORD_TYPE ? "struct"
5225 : code == UNION_TYPE ? "union"
5227 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5230 /* For translation these need to be seperate warnings */
5231 if (code == RECORD_TYPE)
5232 warning ("anonymous struct declared inside parameter list");
5233 else if (code == UNION_TYPE)
5234 warning ("anonymous union declared inside parameter list");
5236 warning ("anonymous enum declared inside parameter list");
5240 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5246 /* Get the struct, enum or union (CODE says which) with tag NAME.
5247 Define the tag as a forward-reference if it is not defined. */
5250 xref_tag (code, name)
5251 enum tree_code code;
5254 /* If a cross reference is requested, look up the type
5255 already defined for this tag and return it. */
5257 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5258 /* If this is the right type of tag, return what we found.
5259 (This reference will be shadowed by shadow_tag later if appropriate.)
5260 If this is the wrong type of tag, do not return it. If it was the
5261 wrong type in the same binding level, we will have had an error
5262 message already; if in a different binding level and declaring
5263 a name, pending_xref_error will give an error message; but if in a
5264 different binding level and not declaring a name, this tag should
5265 shadow the previous declaration of a different type of tag, and
5266 this would not work properly if we return the reference found.
5267 (For example, with "struct foo" in an outer scope, "union foo;"
5268 must shadow that tag with a new one of union type.) */
5269 if (ref && TREE_CODE (ref) == code)
5272 /* If no such tag is yet defined, create a forward-reference node
5273 and record it as the "definition".
5274 When a real declaration of this type is found,
5275 the forward-reference will be altered into a real type. */
5277 ref = make_node (code);
5278 if (code == ENUMERAL_TYPE)
5280 /* Give the type a default layout like unsigned int
5281 to avoid crashing if it does not get defined. */
5282 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5283 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5284 TYPE_USER_ALIGN (ref) = 0;
5285 TREE_UNSIGNED (ref) = 1;
5286 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5287 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5288 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5291 pushtag (name, ref);
5296 /* Make sure that the tag NAME is defined *in the current binding level*
5297 at least as a forward reference.
5298 CODE says which kind of tag NAME ought to be. */
5301 start_struct (code, name)
5302 enum tree_code code;
5305 /* If there is already a tag defined at this binding level
5306 (as a forward reference), just return it. */
5308 register tree ref = 0;
5311 ref = lookup_tag (code, name, current_binding_level, 1);
5312 if (ref && TREE_CODE (ref) == code)
5314 C_TYPE_BEING_DEFINED (ref) = 1;
5315 TYPE_PACKED (ref) = flag_pack_struct;
5316 if (TYPE_FIELDS (ref))
5317 error ("redefinition of `%s %s'",
5318 code == UNION_TYPE ? "union" : "struct",
5319 IDENTIFIER_POINTER (name));
5324 /* Otherwise create a forward-reference just so the tag is in scope. */
5326 ref = make_node (code);
5327 pushtag (name, ref);
5328 C_TYPE_BEING_DEFINED (ref) = 1;
5329 TYPE_PACKED (ref) = flag_pack_struct;
5333 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5334 of a structure component, returning a FIELD_DECL node.
5335 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5337 This is done during the parsing of the struct declaration.
5338 The FIELD_DECL nodes are chained together and the lot of them
5339 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5342 grokfield (filename, line, declarator, declspecs, width)
5343 const char *filename ATTRIBUTE_UNUSED;
5344 int line ATTRIBUTE_UNUSED;
5345 tree declarator, declspecs, width;
5349 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5351 finish_decl (value, NULL_TREE, NULL_TREE);
5352 DECL_INITIAL (value) = width;
5354 maybe_objc_check_decl (value);
5358 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5359 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5360 ATTRIBUTES are attributes to be applied to the structure. */
5363 finish_struct (t, fieldlist, attributes)
5369 int toplevel = global_binding_level == current_binding_level;
5370 int saw_named_field;
5372 /* If this type was previously laid out as a forward reference,
5373 make sure we lay it out again. */
5377 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5379 /* Nameless union parm types are useful as GCC extension. */
5380 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5381 /* Otherwise, warn about any struct or union def. in parmlist. */
5382 if (in_parm_level_p ())
5385 pedwarn ("%s defined inside parms",
5386 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5387 else if (! flag_traditional)
5388 warning ("%s defined inside parms",
5389 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5394 for (x = fieldlist; x; x = TREE_CHAIN (x))
5395 if (DECL_NAME (x) != 0)
5399 pedwarn ("%s has no %s",
5400 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5401 fieldlist ? _("named members") : _("members"));
5404 /* Install struct as DECL_CONTEXT of each field decl.
5405 Also process specified field sizes,m which is found in the DECL_INITIAL.
5406 Store 0 there, except for ": 0" fields (so we can find them
5407 and delete them, below). */
5409 saw_named_field = 0;
5410 for (x = fieldlist; x; x = TREE_CHAIN (x))
5412 DECL_CONTEXT (x) = t;
5413 DECL_PACKED (x) |= TYPE_PACKED (t);
5415 /* If any field is const, the structure type is pseudo-const. */
5416 if (TREE_READONLY (x))
5417 C_TYPE_FIELDS_READONLY (t) = 1;
5420 /* A field that is pseudo-const makes the structure likewise. */
5421 tree t1 = TREE_TYPE (x);
5422 while (TREE_CODE (t1) == ARRAY_TYPE)
5423 t1 = TREE_TYPE (t1);
5424 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5425 && C_TYPE_FIELDS_READONLY (t1))
5426 C_TYPE_FIELDS_READONLY (t) = 1;
5429 /* Any field that is volatile means variables of this type must be
5430 treated in some ways as volatile. */
5431 if (TREE_THIS_VOLATILE (x))
5432 C_TYPE_FIELDS_VOLATILE (t) = 1;
5434 /* Any field of nominal variable size implies structure is too. */
5435 if (C_DECL_VARIABLE_SIZE (x))
5436 C_TYPE_VARIABLE_SIZE (t) = 1;
5438 /* Detect invalid nested redefinition. */
5439 if (TREE_TYPE (x) == t)
5440 error ("nested redefinition of `%s'",
5441 IDENTIFIER_POINTER (TYPE_NAME (t)));
5443 /* Detect invalid bit-field size. */
5444 if (DECL_INITIAL (x))
5445 STRIP_NOPS (DECL_INITIAL (x));
5446 if (DECL_INITIAL (x))
5448 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5449 constant_expression_warning (DECL_INITIAL (x));
5453 "bit-field `%s' width not an integer constant");
5454 DECL_INITIAL (x) = NULL;
5458 /* Detect invalid bit-field type. */
5459 if (DECL_INITIAL (x)
5460 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5461 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5462 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5464 error_with_decl (x, "bit-field `%s' has invalid type");
5465 DECL_INITIAL (x) = NULL;
5468 if (DECL_INITIAL (x) && pedantic
5469 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5470 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5471 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5472 /* Accept an enum that's equivalent to int or unsigned int. */
5473 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5474 && (TYPE_PRECISION (TREE_TYPE (x))
5475 == TYPE_PRECISION (integer_type_node))))
5476 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5478 /* Detect and ignore out of range field width and process valid
5480 if (DECL_INITIAL (x))
5483 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5484 max_width = CHAR_TYPE_SIZE;
5486 max_width = TYPE_PRECISION (TREE_TYPE (x));
5487 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5488 error_with_decl (x, "negative width in bit-field `%s'");
5489 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5490 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5491 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5492 error_with_decl (x, "zero width for bit-field `%s'");
5495 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5496 unsigned HOST_WIDE_INT width
5497 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5499 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5500 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5501 TREE_UNSIGNED (TREE_TYPE (x)))
5503 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5504 TREE_UNSIGNED (TREE_TYPE (x))))))
5505 warning_with_decl (x,
5506 "`%s' is narrower than values of its type");
5508 DECL_SIZE (x) = bitsize_int (width);
5509 DECL_BIT_FIELD (x) = 1;
5510 SET_DECL_C_BIT_FIELD (x);
5514 /* field size 0 => force desired amount of alignment. */
5515 #ifdef EMPTY_FIELD_BOUNDARY
5516 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5518 #ifdef PCC_BITFIELD_TYPE_MATTERS
5519 if (PCC_BITFIELD_TYPE_MATTERS)
5521 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5522 TYPE_ALIGN (TREE_TYPE (x)));
5523 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5530 else if (TREE_TYPE (x) != error_mark_node)
5532 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5533 : TYPE_ALIGN (TREE_TYPE (x)));
5535 /* Non-bit-fields are aligned for their type, except packed
5536 fields which require only BITS_PER_UNIT alignment. */
5537 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5538 if (! DECL_PACKED (x))
5539 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5542 DECL_INITIAL (x) = 0;
5544 /* Detect flexible array member in an invalid context. */
5545 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5546 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5547 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5548 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5550 if (TREE_CODE (t) == UNION_TYPE)
5551 error_with_decl (x, "flexible array member in union");
5552 else if (TREE_CHAIN (x) != NULL_TREE)
5553 error_with_decl (x, "flexible array member not at end of struct");
5554 else if (! saw_named_field)
5555 error_with_decl (x, "flexible array member in otherwise empty struct");
5558 saw_named_field = 1;
5561 /* Delete all duplicate fields from the fieldlist */
5562 for (x = fieldlist; x && TREE_CHAIN (x);)
5563 /* Anonymous fields aren't duplicates. */
5564 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5568 register tree y = fieldlist;
5572 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5578 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5580 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5581 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5587 /* Now we have the nearly final fieldlist. Record it,
5588 then lay out the structure or union (including the fields). */
5590 TYPE_FIELDS (t) = fieldlist;
5594 /* Delete all zero-width bit-fields from the fieldlist */
5596 tree *fieldlistp = &fieldlist;
5598 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5599 *fieldlistp = TREE_CHAIN (*fieldlistp);
5601 fieldlistp = &TREE_CHAIN (*fieldlistp);
5604 /* Now we have the truly final field list.
5605 Store it in this type and in the variants. */
5607 TYPE_FIELDS (t) = fieldlist;
5609 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5611 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5612 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5613 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5614 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5617 /* If this was supposed to be a transparent union, but we can't
5618 make it one, warn and turn off the flag. */
5619 if (TREE_CODE (t) == UNION_TYPE
5620 && TYPE_TRANSPARENT_UNION (t)
5621 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5623 TYPE_TRANSPARENT_UNION (t) = 0;
5624 warning ("union cannot be made transparent");
5627 /* If this structure or union completes the type of any previous
5628 variable declaration, lay it out and output its rtl. */
5630 if (current_binding_level->n_incomplete != 0)
5633 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5635 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5636 && TREE_CODE (decl) != TYPE_DECL)
5638 layout_decl (decl, 0);
5639 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5640 maybe_objc_check_decl (decl);
5641 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5644 --current_binding_level->n_incomplete;
5646 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5647 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5649 tree element = TREE_TYPE (decl);
5650 while (TREE_CODE (element) == ARRAY_TYPE)
5651 element = TREE_TYPE (element);
5653 layout_array_type (TREE_TYPE (decl));
5658 /* Finish debugging output for this type. */
5659 rest_of_type_compilation (t, toplevel);
5664 /* Lay out the type T, and its element type, and so on. */
5667 layout_array_type (t)
5670 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5671 layout_array_type (TREE_TYPE (t));
5675 /* Begin compiling the definition of an enumeration type.
5676 NAME is its name (or null if anonymous).
5677 Returns the type object, as yet incomplete.
5678 Also records info about it so that build_enumerator
5679 may be used to declare the individual values as they are read. */
5685 register tree enumtype = 0;
5687 /* If this is the real definition for a previous forward reference,
5688 fill in the contents in the same object that used to be the
5689 forward reference. */
5692 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5694 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5696 enumtype = make_node (ENUMERAL_TYPE);
5697 pushtag (name, enumtype);
5700 C_TYPE_BEING_DEFINED (enumtype) = 1;
5702 if (TYPE_VALUES (enumtype) != 0)
5704 /* This enum is a named one that has been declared already. */
5705 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5707 /* Completely replace its old definition.
5708 The old enumerators remain defined, however. */
5709 TYPE_VALUES (enumtype) = 0;
5712 enum_next_value = integer_zero_node;
5715 if (flag_short_enums)
5716 TYPE_PACKED (enumtype) = 1;
5721 /* After processing and defining all the values of an enumeration type,
5722 install their decls in the enumeration type and finish it off.
5723 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5724 and ATTRIBUTES are the specified attributes.
5725 Returns ENUMTYPE. */
5728 finish_enum (enumtype, values, attributes)
5733 register tree pair, tem;
5734 tree minnode = 0, maxnode = 0, enum_value_type;
5735 int precision, unsign;
5736 int toplevel = (global_binding_level == current_binding_level);
5738 if (in_parm_level_p ())
5739 warning ("enum defined inside parms");
5741 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5743 /* Calculate the maximum value of any enumerator in this type. */
5745 if (values == error_mark_node)
5746 minnode = maxnode = integer_zero_node;
5749 minnode = maxnode = TREE_VALUE (values);
5750 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5752 tree value = TREE_VALUE (pair);
5753 if (tree_int_cst_lt (maxnode, value))
5755 if (tree_int_cst_lt (value, minnode))
5760 /* Construct the final type of this enumeration. It is the same
5761 as one of the integral types - the narrowest one that fits, except
5762 that normally we only go as narrow as int - and signed iff any of
5763 the values are negative. */
5764 unsign = (tree_int_cst_sgn (minnode) >= 0);
5765 precision = MAX (min_precision (minnode, unsign),
5766 min_precision (maxnode, unsign));
5767 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5769 tree narrowest = type_for_size (precision, unsign);
5772 warning ("enumeration values exceed range of largest integer");
5773 narrowest = long_long_integer_type_node;
5776 precision = TYPE_PRECISION (narrowest);
5779 precision = TYPE_PRECISION (integer_type_node);
5781 if (precision == TYPE_PRECISION (integer_type_node))
5782 enum_value_type = type_for_size (precision, 0);
5784 enum_value_type = enumtype;
5786 TYPE_MIN_VALUE (enumtype) = minnode;
5787 TYPE_MAX_VALUE (enumtype) = maxnode;
5788 TYPE_PRECISION (enumtype) = precision;
5789 TREE_UNSIGNED (enumtype) = unsign;
5790 TYPE_SIZE (enumtype) = 0;
5791 layout_type (enumtype);
5793 if (values != error_mark_node)
5795 /* Change the type of the enumerators to be the enum type. We
5796 need to do this irrespective of the size of the enum, for
5797 proper type checking. Replace the DECL_INITIALs of the
5798 enumerators, and the value slots of the list, with copies
5799 that have the enum type; they cannot be modified in place
5800 because they may be shared (e.g. integer_zero_node) Finally,
5801 change the purpose slots to point to the names of the decls. */
5802 for (pair = values; pair; pair = TREE_CHAIN (pair))
5804 tree enu = TREE_PURPOSE (pair);
5806 TREE_TYPE (enu) = enumtype;
5807 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5808 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5809 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5810 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5811 DECL_MODE (enu) = TYPE_MODE (enumtype);
5813 /* The ISO C Standard mandates enumerators to have type int,
5814 even though the underlying type of an enum type is
5815 unspecified. Here we convert any enumerators that fit in
5816 an int to type int, to avoid promotions to unsigned types
5817 when comparing integers with enumerators that fit in the
5818 int range. When -pedantic is given, build_enumerator()
5819 would have already taken care of those that don't fit. */
5820 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5821 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5823 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5825 TREE_PURPOSE (pair) = DECL_NAME (enu);
5826 TREE_VALUE (pair) = DECL_INITIAL (enu);
5829 TYPE_VALUES (enumtype) = values;
5832 /* Fix up all variant types of this enum type. */
5833 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5835 if (tem == enumtype)
5837 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5838 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5839 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5840 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5841 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5842 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5843 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5844 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5845 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5846 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5849 /* Finish debugging output for this type. */
5850 rest_of_type_compilation (enumtype, toplevel);
5855 /* Build and install a CONST_DECL for one value of the
5856 current enumeration type (one that was begun with start_enum).
5857 Return a tree-list containing the CONST_DECL and its value.
5858 Assignment of sequential values by default is handled here. */
5861 build_enumerator (name, value)
5864 register tree decl, type;
5866 /* Validate and default VALUE. */
5868 /* Remove no-op casts from the value. */
5870 STRIP_TYPE_NOPS (value);
5874 if (TREE_CODE (value) == INTEGER_CST)
5876 value = default_conversion (value);
5877 constant_expression_warning (value);
5881 error ("enumerator value for `%s' not integer constant",
5882 IDENTIFIER_POINTER (name));
5887 /* Default based on previous value. */
5888 /* It should no longer be possible to have NON_LVALUE_EXPR
5892 value = enum_next_value;
5894 error ("overflow in enumeration values");
5897 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5899 pedwarn ("ISO C restricts enumerator values to range of `int'");
5900 value = convert (integer_type_node, value);
5903 /* Set basis for default for next value. */
5904 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5905 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5907 /* Now create a declaration for the enum value name. */
5909 type = TREE_TYPE (value);
5910 type = type_for_size (MAX (TYPE_PRECISION (type),
5911 TYPE_PRECISION (integer_type_node)),
5913 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5914 && TREE_UNSIGNED (type)));
5916 decl = build_decl (CONST_DECL, name, type);
5917 DECL_INITIAL (decl) = convert (type, value);
5920 return tree_cons (decl, value, NULL_TREE);
5924 /* Create the FUNCTION_DECL for a function definition.
5925 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5926 the declaration; they describe the function's name and the type it returns,
5927 but twisted together in a fashion that parallels the syntax of C.
5929 This function creates a binding context for the function body
5930 as well as setting up the FUNCTION_DECL in current_function_decl.
5932 Returns 1 on success. If the DECLARATOR is not suitable for a function
5933 (it defines a datum instead), we return 0, which tells
5934 yyparse to report a parse error. */
5937 start_function (declspecs, declarator, attributes)
5938 tree declarator, declspecs, attributes;
5940 tree decl1, old_decl;
5942 int old_immediate_size_expand = immediate_size_expand;
5944 current_function_returns_value = 0; /* Assume, until we see it does. */
5945 current_function_returns_null = 0;
5946 warn_about_return_type = 0;
5947 current_extern_inline = 0;
5948 c_function_varargs = 0;
5950 shadowed_labels = 0;
5952 /* Don't expand any sizes in the return type of the function. */
5953 immediate_size_expand = 0;
5955 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5957 /* If the declarator is not suitable for a function definition,
5958 cause a syntax error. */
5961 immediate_size_expand = old_immediate_size_expand;
5965 decl_attributes (&decl1, attributes, 0);
5967 announce_function (decl1);
5969 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5971 error ("return type is an incomplete type");
5972 /* Make it return void instead. */
5974 = build_function_type (void_type_node,
5975 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5978 if (warn_about_return_type)
5979 pedwarn_c99 ("return type defaults to `int'");
5981 /* Save the parm names or decls from this function's declarator
5982 where store_parm_decls will find them. */
5983 current_function_parms = last_function_parms;
5984 current_function_parm_tags = last_function_parm_tags;
5986 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5987 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5988 DECL_INITIAL (decl1) = error_mark_node;
5990 /* If this definition isn't a prototype and we had a prototype declaration
5991 before, copy the arg type info from that prototype.
5992 But not if what we had before was a builtin function. */
5993 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5994 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5995 && !DECL_BUILT_IN (old_decl)
5996 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5997 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5998 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6000 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6001 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6002 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6005 /* If there is no explicit declaration, look for any out-of-scope implicit
6008 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6010 /* Optionally warn of old-fashioned def with no previous prototype. */
6011 if (warn_strict_prototypes
6012 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6014 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6015 || (DECL_BUILT_IN (old_decl)
6016 && ! C_DECL_ANTICIPATED (old_decl)))))
6017 warning ("function declaration isn't a prototype");
6018 /* Optionally warn of any global def with no previous prototype. */
6019 else if (warn_missing_prototypes
6020 && TREE_PUBLIC (decl1)
6022 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6023 || (DECL_BUILT_IN (old_decl)
6024 && ! C_DECL_ANTICIPATED (old_decl))))
6025 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6026 warning_with_decl (decl1, "no previous prototype for `%s'");
6027 /* Optionally warn of any def with no previous prototype
6028 if the function has already been used. */
6029 else if (warn_missing_prototypes
6030 && old_decl != 0 && TREE_USED (old_decl)
6031 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6032 warning_with_decl (decl1,
6033 "`%s' was used with no prototype before its definition");
6034 /* Optionally warn of any global def with no previous declaration. */
6035 else if (warn_missing_declarations
6036 && TREE_PUBLIC (decl1)
6038 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6039 warning_with_decl (decl1, "no previous declaration for `%s'");
6040 /* Optionally warn of any def with no previous declaration
6041 if the function has already been used. */
6042 else if (warn_missing_declarations
6043 && old_decl != 0 && TREE_USED (old_decl)
6044 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6045 warning_with_decl (decl1,
6046 "`%s' was used with no declaration before its definition");
6048 /* This is a definition, not a reference.
6049 So normally clear DECL_EXTERNAL.
6050 However, `extern inline' acts like a declaration
6051 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6052 DECL_EXTERNAL (decl1) = current_extern_inline;
6054 /* This function exists in static storage.
6055 (This does not mean `static' in the C sense!) */
6056 TREE_STATIC (decl1) = 1;
6058 /* A nested function is not global. */
6059 if (current_function_decl != 0)
6060 TREE_PUBLIC (decl1) = 0;
6062 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6063 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6068 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6069 != integer_type_node)
6070 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6072 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6073 args = TREE_CHAIN (args))
6075 tree type = args ? TREE_VALUE (args) : 0;
6077 if (type == void_type_node)
6084 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6085 pedwarn_with_decl (decl1,
6086 "first argument of `%s' should be `int'");
6090 if (TREE_CODE (type) != POINTER_TYPE
6091 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6092 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6094 pedwarn_with_decl (decl1,
6095 "second argument of `%s' should be `char **'");
6099 if (TREE_CODE (type) != POINTER_TYPE
6100 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6101 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6103 pedwarn_with_decl (decl1,
6104 "third argument of `%s' should probably be `char **'");
6109 /* It is intentional that this message does not mention the third
6110 argument because it's only mentioned in an appendix of the
6112 if (argct > 0 && (argct < 2 || argct > 3))
6113 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6115 if (! TREE_PUBLIC (decl1))
6116 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6119 /* Record the decl so that the function name is defined.
6120 If we already have a decl for this name, and it is a FUNCTION_DECL,
6121 use the old decl. */
6123 current_function_decl = pushdecl (decl1);
6126 declare_parm_level (1);
6127 current_binding_level->subblocks_tag_transparent = 1;
6129 make_decl_rtl (current_function_decl, NULL);
6131 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6132 /* Promote the value to int before returning it. */
6133 if (c_promoting_integer_type_p (restype))
6135 /* It retains unsignedness if traditional
6136 or if not really getting wider. */
6137 if (TREE_UNSIGNED (restype)
6138 && (flag_traditional
6139 || (TYPE_PRECISION (restype)
6140 == TYPE_PRECISION (integer_type_node))))
6141 restype = unsigned_type_node;
6143 restype = integer_type_node;
6145 DECL_RESULT (current_function_decl)
6146 = build_decl (RESULT_DECL, NULL_TREE, restype);
6148 /* If this fcn was already referenced via a block-scope `extern' decl
6149 (or an implicit decl), propagate certain information about the usage. */
6150 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6151 TREE_ADDRESSABLE (current_function_decl) = 1;
6153 immediate_size_expand = old_immediate_size_expand;
6155 start_fname_decls ();
6160 /* Record that this function is going to be a varargs function.
6161 This is called before store_parm_decls, which is too early
6162 to call mark_varargs directly. */
6167 c_function_varargs = 1;
6170 /* Store the parameter declarations into the current function declaration.
6171 This is called after parsing the parameter declarations, before
6172 digesting the body of the function.
6174 For an old-style definition, modify the function's type
6175 to specify at least the number of arguments. */
6180 register tree fndecl = current_function_decl;
6183 /* This is either a chain of PARM_DECLs (if a prototype was used)
6184 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6185 tree specparms = current_function_parms;
6187 /* This is a list of types declared among parms in a prototype. */
6188 tree parmtags = current_function_parm_tags;
6190 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6191 register tree parmdecls = getdecls ();
6193 /* This is a chain of any other decls that came in among the parm
6194 declarations. If a parm is declared with enum {foo, bar} x;
6195 then CONST_DECLs for foo and bar are put here. */
6198 /* Nonzero if this definition is written with a prototype. */
6201 /* The function containing FNDECL, if any. */
6202 tree context = decl_function_context (fndecl);
6204 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6206 /* This case is when the function was defined with an ANSI prototype.
6207 The parms already have decls, so we need not do anything here
6208 except record them as in effect
6209 and complain if any redundant old-style parm decls were written. */
6220 error_with_decl (fndecl,
6221 "parm types given both in parmlist and separately");
6222 /* Get rid of the erroneous decls; don't keep them on
6223 the list of parms, since they might not be PARM_DECLs. */
6224 for (decl = current_binding_level->names;
6225 decl; decl = TREE_CHAIN (decl))
6226 if (DECL_NAME (decl))
6227 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6228 for (link = current_binding_level->shadowed;
6229 link; link = TREE_CHAIN (link))
6230 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6231 current_binding_level->names = 0;
6232 current_binding_level->shadowed = 0;
6235 specparms = nreverse (specparms);
6236 for (parm = specparms; parm; parm = next)
6238 next = TREE_CHAIN (parm);
6239 if (TREE_CODE (parm) == PARM_DECL)
6241 if (DECL_NAME (parm) == 0)
6242 error_with_decl (parm, "parameter name omitted");
6243 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6244 && VOID_TYPE_P (TREE_TYPE (parm)))
6246 error_with_decl (parm, "parameter `%s' declared void");
6247 /* Change the type to error_mark_node so this parameter
6248 will be ignored by assign_parms. */
6249 TREE_TYPE (parm) = error_mark_node;
6255 /* If we find an enum constant or a type tag,
6256 put it aside for the moment. */
6257 TREE_CHAIN (parm) = 0;
6258 others = chainon (others, parm);
6262 /* Get the decls in their original chain order
6263 and record in the function. */
6264 DECL_ARGUMENTS (fndecl) = getdecls ();
6267 /* If this function takes a variable number of arguments,
6268 add a phony parameter to the end of the parm list,
6269 to represent the position of the first unnamed argument. */
6270 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6273 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6274 /* Let's hope the address of the unnamed parm
6275 won't depend on its type. */
6276 TREE_TYPE (dummy) = integer_type_node;
6277 DECL_ARG_TYPE (dummy) = integer_type_node;
6278 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6282 /* Now pushdecl the enum constants. */
6283 for (parm = others; parm; parm = next)
6285 next = TREE_CHAIN (parm);
6286 if (DECL_NAME (parm) == 0)
6288 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6290 else if (TREE_CODE (parm) != PARM_DECL)
6294 storetags (chainon (parmtags, gettags ()));
6298 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6299 each with a parm name as the TREE_VALUE.
6301 PARMDECLS is a chain of declarations for parameters.
6302 Warning! It can also contain CONST_DECLs which are not parameters
6303 but are names of enumerators of any enum types
6304 declared among the parameters.
6306 First match each formal parameter name with its declaration.
6307 Associate decls with the names and store the decls
6308 into the TREE_PURPOSE slots. */
6310 /* We use DECL_WEAK as a flag to show which parameters have been
6311 seen already since it is not used on PARM_DECL or CONST_DECL. */
6312 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6313 DECL_WEAK (parm) = 0;
6315 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6317 register tree tail, found = NULL;
6319 if (TREE_VALUE (parm) == 0)
6321 error_with_decl (fndecl,
6322 "parameter name missing from parameter list");
6323 TREE_PURPOSE (parm) = 0;
6327 /* See if any of the parmdecls specifies this parm by name.
6328 Ignore any enumerator decls. */
6329 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6330 if (DECL_NAME (tail) == TREE_VALUE (parm)
6331 && TREE_CODE (tail) == PARM_DECL)
6337 /* If declaration already marked, we have a duplicate name.
6338 Complain, and don't use this decl twice. */
6339 if (found && DECL_WEAK (found))
6341 error_with_decl (found, "multiple parameters named `%s'");
6345 /* If the declaration says "void", complain and ignore it. */
6346 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6348 error_with_decl (found, "parameter `%s' declared void");
6349 TREE_TYPE (found) = integer_type_node;
6350 DECL_ARG_TYPE (found) = integer_type_node;
6351 layout_decl (found, 0);
6354 /* Traditionally, a parm declared float is actually a double. */
6355 if (found && flag_traditional
6356 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6358 TREE_TYPE (found) = double_type_node;
6359 DECL_ARG_TYPE (found) = double_type_node;
6360 layout_decl (found, 0);
6363 /* If no declaration found, default to int. */
6366 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6368 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6369 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6370 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6372 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6373 else if (extra_warnings)
6374 warning_with_decl (found, "type of `%s' defaults to `int'");
6378 TREE_PURPOSE (parm) = found;
6380 /* Mark this decl as "already found". */
6381 DECL_WEAK (found) = 1;
6384 /* Put anything which is on the parmdecls chain and which is
6385 not a PARM_DECL onto the list NONPARMS. (The types of
6386 non-parm things which might appear on the list include
6387 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6388 any actual PARM_DECLs not matched with any names. */
6391 for (parm = parmdecls; parm;)
6393 tree next = TREE_CHAIN (parm);
6394 TREE_CHAIN (parm) = 0;
6396 if (TREE_CODE (parm) != PARM_DECL)
6397 nonparms = chainon (nonparms, parm);
6400 /* Complain about args with incomplete types. */
6401 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6403 error_with_decl (parm, "parameter `%s' has incomplete type");
6404 TREE_TYPE (parm) = error_mark_node;
6407 if (! DECL_WEAK (parm))
6409 error_with_decl (parm,
6410 "declaration for parameter `%s' but no such parameter");
6411 /* Pretend the parameter was not missing.
6412 This gets us to a standard state and minimizes
6413 further error messages. */
6415 = chainon (specparms,
6416 tree_cons (parm, NULL_TREE, NULL_TREE));
6423 /* Chain the declarations together in the order of the list of
6424 names. Store that chain in the function decl, replacing the
6427 DECL_ARGUMENTS (fndecl) = 0;
6430 for (last = 0; parm; parm = TREE_CHAIN (parm))
6431 if (TREE_PURPOSE (parm))
6434 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6436 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6437 last = TREE_PURPOSE (parm);
6438 TREE_CHAIN (last) = 0;
6442 /* If there was a previous prototype,
6443 set the DECL_ARG_TYPE of each argument according to
6444 the type previously specified, and report any mismatches. */
6446 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6449 for (parm = DECL_ARGUMENTS (fndecl),
6450 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6451 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6452 != void_type_node));
6453 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6455 if (parm == 0 || type == 0
6456 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6458 error ("number of arguments doesn't match prototype");
6459 error_with_file_and_line (current_function_prototype_file,
6460 current_function_prototype_line,
6461 "prototype declaration");
6464 /* Type for passing arg must be consistent with that
6465 declared for the arg. ISO C says we take the unqualified
6466 type for parameters declared with qualified type. */
6467 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6468 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6470 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6471 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6473 /* Adjust argument to match prototype. E.g. a previous
6474 `int foo(float);' prototype causes
6475 `int foo(x) float x; {...}' to be treated like
6476 `int foo(float x) {...}'. This is particularly
6477 useful for argument types like uid_t. */
6478 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6480 if (PROMOTE_PROTOTYPES
6481 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6482 && TYPE_PRECISION (TREE_TYPE (parm))
6483 < TYPE_PRECISION (integer_type_node))
6484 DECL_ARG_TYPE (parm) = integer_type_node;
6488 pedwarn ("promoted argument `%s' doesn't match prototype",
6489 IDENTIFIER_POINTER (DECL_NAME (parm)));
6490 warning_with_file_and_line
6491 (current_function_prototype_file,
6492 current_function_prototype_line,
6493 "prototype declaration");
6496 /* If -traditional, allow `int' argument to match
6497 `unsigned' prototype. */
6498 else if (! (flag_traditional
6499 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6500 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6502 error ("argument `%s' doesn't match prototype",
6503 IDENTIFIER_POINTER (DECL_NAME (parm)));
6504 error_with_file_and_line (current_function_prototype_file,
6505 current_function_prototype_line,
6506 "prototype declaration");
6510 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6513 /* Otherwise, create a prototype that would match. */
6517 tree actual = 0, last = 0, type;
6519 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6521 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6523 TREE_CHAIN (last) = type;
6528 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6530 TREE_CHAIN (last) = type;
6534 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6535 of the type of this function, but we need to avoid having this
6536 affect the types of other similarly-typed functions, so we must
6537 first force the generation of an identical (but separate) type
6538 node for the relevant function type. The new node we create
6539 will be a variant of the main variant of the original function
6542 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6544 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6547 /* Now store the final chain of decls for the arguments
6548 as the decl-chain of the current lexical scope.
6549 Put the enumerators in as well, at the front so that
6550 DECL_ARGUMENTS is not modified. */
6552 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6555 /* Make sure the binding level for the top of the function body
6556 gets a BLOCK if there are any in the function.
6557 Otherwise, the dbx output is wrong. */
6559 keep_next_if_subblocks = 1;
6561 /* ??? This might be an improvement,
6562 but needs to be thought about some more. */
6564 keep_next_level_flag = 1;
6567 /* Write a record describing this function definition to the prototypes
6568 file (if requested). */
6570 gen_aux_info_record (fndecl, 1, 0, prototype);
6572 /* Initialize the RTL code for the function. */
6573 init_function_start (fndecl, input_filename, lineno);
6575 /* Begin the statement tree for this function. */
6576 DECL_LANG_SPECIFIC (current_function_decl)
6577 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6578 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6580 /* If this is a nested function, save away the sizes of any
6581 variable-size types so that we can expand them when generating
6587 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6588 = nreverse (get_pending_sizes ());
6589 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6592 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6595 /* This function is being processed in whole-function mode. */
6596 cfun->x_whole_function_mode_p = 1;
6598 /* Even though we're inside a function body, we still don't want to
6599 call expand_expr to calculate the size of a variable-sized array.
6600 We haven't necessarily assigned RTL to all variables yet, so it's
6601 not safe to try to expand expressions involving them. */
6602 immediate_size_expand = 0;
6603 cfun->x_dont_save_pending_sizes_p = 1;
6606 /* Finish up a function declaration and compile that function
6607 all the way to assembler language output. The free the storage
6608 for the function definition.
6610 This is called after parsing the body of the function definition.
6612 NESTED is nonzero if the function being finished is nested in another. */
6615 finish_function (nested)
6618 register tree fndecl = current_function_decl;
6620 /* TREE_READONLY (fndecl) = 1;
6621 This caused &foo to be of type ptr-to-const-function
6622 which then got a warning when stored in a ptr-to-function variable. */
6625 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6627 /* Must mark the RESULT_DECL as being in this function. */
6629 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6631 /* Obey `register' declarations if `setjmp' is called in this fn. */
6632 if (flag_traditional && current_function_calls_setjmp)
6634 setjmp_protect (DECL_INITIAL (fndecl));
6635 setjmp_protect_args ();
6638 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6640 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6641 != integer_type_node)
6643 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6644 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6646 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6650 #ifdef DEFAULT_MAIN_RETURN
6651 /* Make it so that `main' always returns success by default. */
6652 DEFAULT_MAIN_RETURN;
6655 c_expand_return (integer_zero_node);
6660 finish_fname_decls ();
6662 /* Tie off the statement tree for this function. */
6663 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6664 /* Clear out memory we no longer need. */
6665 free_after_parsing (cfun);
6666 /* Since we never call rest_of_compilation, we never clear
6667 CFUN. Do so explicitly. */
6668 free_after_compilation (cfun);
6673 /* Generate RTL for the body of this function. */
6674 c_expand_body (fndecl, nested);
6675 /* Let the error reporting routines know that we're outside a
6676 function. For a nested function, this value is used in
6677 pop_c_function_context and then reset via pop_function_context. */
6678 current_function_decl = NULL;
6682 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6683 then we are already in the process of generating RTL for another
6687 c_expand_body (fndecl, nested_p)
6691 /* There's no reason to do any of the work here if we're only doing
6692 semantic analysis; this code just generates RTL. */
6693 if (flag_syntax_only)
6698 /* Make sure that we will evaluate variable-sized types involved
6699 in our function's type. */
6700 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6701 /* Squirrel away our current state. */
6702 push_function_context ();
6705 /* Initialize the RTL code for the function. */
6706 current_function_decl = fndecl;
6707 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6709 /* This function is being processed in whole-function mode. */
6710 cfun->x_whole_function_mode_p = 1;
6712 /* Even though we're inside a function body, we still don't want to
6713 call expand_expr to calculate the size of a variable-sized array.
6714 We haven't necessarily assigned RTL to all variables yet, so it's
6715 not safe to try to expand expressions involving them. */
6716 immediate_size_expand = 0;
6717 cfun->x_dont_save_pending_sizes_p = 1;
6719 /* If this is a varargs function, inform function.c. */
6720 if (c_function_varargs)
6723 /* Set up parameters and prepare for return, for the function. */
6724 expand_function_start (fndecl, 0);
6726 /* If this function is `main', emit a call to `__main'
6727 to run global initializers, etc. */
6728 if (DECL_NAME (fndecl)
6729 && MAIN_NAME_P (DECL_NAME (fndecl))
6730 && DECL_CONTEXT (fndecl) == NULL_TREE)
6731 expand_main_function ();
6733 /* Generate the RTL for this function. */
6734 expand_stmt (DECL_SAVED_TREE (fndecl));
6735 /* Allow the body of the function to be garbage collected. */
6736 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6738 /* We hard-wired immediate_size_expand to zero above.
6739 expand_function_end will decrement this variable. So, we set the
6740 variable to one here, so that after the decrement it will remain
6742 immediate_size_expand = 1;
6744 /* Allow language dialects to perform special processing. */
6745 if (lang_expand_function_end)
6746 (*lang_expand_function_end) ();
6748 /* Generate rtl for function exit. */
6749 expand_function_end (input_filename, lineno, 0);
6751 /* If this is a nested function, protect the local variables in the stack
6752 above us from being collected while we're compiling this function. */
6754 ggc_push_context ();
6756 /* Run the optimizers and output the assembler code for this function. */
6757 rest_of_compilation (fndecl);
6759 /* Undo the GC context switch. */
6763 /* With just -W, complain only if function returns both with
6764 and without a value. */
6766 && current_function_returns_value
6767 && current_function_returns_null)
6768 warning ("this function may return with or without a value");
6770 /* If requested, warn about function definitions where the function will
6771 return a value (usually of some struct or union type) which itself will
6772 take up a lot of stack space. */
6774 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6776 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6778 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6779 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6780 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6783 unsigned int size_as_int
6784 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6786 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6787 warning_with_decl (fndecl,
6788 "size of return value of `%s' is %u bytes",
6791 warning_with_decl (fndecl,
6792 "size of return value of `%s' is larger than %d bytes",
6797 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6799 /* Stop pointing to the local nodes about to be freed.
6800 But DECL_INITIAL must remain nonzero so we know this
6801 was an actual function definition.
6802 For a nested function, this is done in pop_c_function_context.
6803 If rest_of_compilation set this to 0, leave it 0. */
6804 if (DECL_INITIAL (fndecl) != 0)
6805 DECL_INITIAL (fndecl) = error_mark_node;
6807 DECL_ARGUMENTS (fndecl) = 0;
6810 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6812 if (targetm.have_ctors_dtors)
6813 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6814 DEFAULT_INIT_PRIORITY);
6816 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6819 if (DECL_STATIC_DESTRUCTOR (fndecl))
6821 if (targetm.have_ctors_dtors)
6822 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6823 DEFAULT_INIT_PRIORITY);
6825 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6829 /* Return to the enclosing function. */
6830 pop_function_context ();
6833 /* Check the declarations given in a for-loop for satisfying the C99
6836 check_for_loop_decls ()
6842 /* If we get here, declarations have been used in a for loop without
6843 the C99 for loop scope. This doesn't make much sense, so don't
6845 error ("`for' loop initial declaration used outside C99 mode");
6848 /* C99 subclause 6.8.5 paragraph 3:
6850 [#3] The declaration part of a for statement shall only
6851 declare identifiers for objects having storage class auto or
6854 It isn't clear whether, in this sentence, "identifiers" binds to
6855 "shall only declare" or to "objects" - that is, whether all identifiers
6856 declared must be identifiers for objects, or whether the restriction
6857 only applies to those that are. (A question on this in comp.std.c
6858 in November 2000 received no answer.) We implement the strictest
6859 interpretation, to avoid creating an extension which later causes
6862 for (t = gettags (); t; t = TREE_CHAIN (t))
6864 if (TREE_PURPOSE (t) != 0)
6865 error ("`%s %s' declared in `for' loop initial declaration",
6866 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6867 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6869 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6871 for (t = getdecls (); t; t = TREE_CHAIN (t))
6873 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6874 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6875 else if (TREE_STATIC (t))
6876 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6877 else if (DECL_EXTERNAL (t))
6878 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6882 /* Save and restore the variables in this file and elsewhere
6883 that keep track of the progress of compilation of the current function.
6884 Used for nested functions. */
6886 struct c_language_function
6888 struct language_function base;
6890 tree shadowed_labels;
6893 int warn_about_return_type;
6895 struct binding_level *binding_level;
6898 /* Save and reinitialize the variables
6899 used during compilation of a C function. */
6902 push_c_function_context (f)
6905 struct c_language_function *p;
6906 p = ((struct c_language_function *)
6907 xmalloc (sizeof (struct c_language_function)));
6908 f->language = (struct language_function *) p;
6910 p->base.x_stmt_tree = c_stmt_tree;
6911 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6912 p->named_labels = named_labels;
6913 p->shadowed_labels = shadowed_labels;
6914 p->returns_value = current_function_returns_value;
6915 p->returns_null = current_function_returns_null;
6916 p->warn_about_return_type = warn_about_return_type;
6917 p->extern_inline = current_extern_inline;
6918 p->binding_level = current_binding_level;
6921 /* Restore the variables used during compilation of a C function. */
6924 pop_c_function_context (f)
6927 struct c_language_function *p
6928 = (struct c_language_function *) f->language;
6931 /* Bring back all the labels that were shadowed. */
6932 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6933 if (DECL_NAME (TREE_VALUE (link)) != 0)
6934 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6935 = TREE_VALUE (link);
6937 if (DECL_SAVED_INSNS (current_function_decl) == 0
6938 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6940 /* Stop pointing to the local nodes about to be freed. */
6941 /* But DECL_INITIAL must remain nonzero so we know this
6942 was an actual function definition. */
6943 DECL_INITIAL (current_function_decl) = error_mark_node;
6944 DECL_ARGUMENTS (current_function_decl) = 0;
6947 c_stmt_tree = p->base.x_stmt_tree;
6948 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6949 named_labels = p->named_labels;
6950 shadowed_labels = p->shadowed_labels;
6951 current_function_returns_value = p->returns_value;
6952 current_function_returns_null = p->returns_null;
6953 warn_about_return_type = p->warn_about_return_type;
6954 current_extern_inline = p->extern_inline;
6955 current_binding_level = p->binding_level;
6961 /* Mark the language specific parts of F for GC. */
6964 mark_c_function_context (f)
6967 struct c_language_function *p
6968 = (struct c_language_function *) f->language;
6973 mark_c_language_function (&p->base);
6974 ggc_mark_tree (p->shadowed_labels);
6975 ggc_mark_tree (p->named_labels);
6976 mark_binding_level (&p->binding_level);
6979 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6982 copy_lang_decl (decl)
6985 struct lang_decl *ld;
6987 if (!DECL_LANG_SPECIFIC (decl))
6990 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6991 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6992 sizeof (struct lang_decl));
6993 DECL_LANG_SPECIFIC (decl) = ld;
6996 /* Mark the language specific bits in T for GC. */
7002 if (TREE_CODE (t) == IDENTIFIER_NODE)
7004 struct lang_identifier *i = (struct lang_identifier *) t;
7005 ggc_mark_tree (i->global_value);
7006 ggc_mark_tree (i->local_value);
7007 ggc_mark_tree (i->label_value);
7008 ggc_mark_tree (i->implicit_decl);
7009 ggc_mark_tree (i->error_locus);
7010 ggc_mark_tree (i->limbo_value);
7012 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7013 ggc_mark (TYPE_LANG_SPECIFIC (t));
7014 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7016 ggc_mark (DECL_LANG_SPECIFIC (t));
7017 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7018 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7022 /* The functions below are required for functionality of doing
7023 function at once processing in the C front end. Currently these
7024 functions are not called from anywhere in the C front end, but as
7025 these changes continue, that will change. */
7027 /* Returns non-zero if the current statement is a full expression,
7028 i.e. temporaries created during that statement should be destroyed
7029 at the end of the statement. */
7032 stmts_are_full_exprs_p ()
7037 /* Returns the stmt_tree (if any) to which statements are currently
7038 being added. If there is no active statement-tree, NULL is
7042 current_stmt_tree ()
7044 return &c_stmt_tree;
7047 /* Returns the stack of SCOPE_STMTs for the current function. */
7050 current_scope_stmt_stack ()
7052 return &c_scope_stmt_stack;
7055 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7059 anon_aggr_type_p (node)
7060 tree node ATTRIBUTE_UNUSED;
7065 /* Dummy function in place of callback used by C++. */
7068 extract_interface_info ()
7072 /* Return a new COMPOUND_STMT, after adding it to the current
7076 c_begin_compound_stmt ()
7080 /* Create the COMPOUND_STMT. */
7081 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7086 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7090 c_expand_decl_stmt (t)
7093 tree decl = DECL_STMT_DECL (t);
7095 /* Expand nested functions. */
7096 if (TREE_CODE (decl) == FUNCTION_DECL
7097 && DECL_CONTEXT (decl) == current_function_decl
7098 && DECL_SAVED_TREE (decl))
7099 c_expand_body (decl, /*nested_p=*/1);
7102 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7103 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7106 identifier_global_value (t)
7109 return IDENTIFIER_GLOBAL_VALUE (t);
7112 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7113 otherwise the name is found in ridpointers from RID_INDEX. */
7116 record_builtin_type (rid_index, name, type)
7123 id = ridpointers[(int) rid_index];
7125 id = get_identifier (name);
7126 pushdecl (build_decl (TYPE_DECL, id, type));
7129 /* Build the void_list_node (void_type_node having been created). */
7131 build_void_list_node ()
7133 tree t = build_tree_list (NULL_TREE, void_type_node);