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 GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 /* 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 *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 (dump_switch_p (p))
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_MACHINE_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_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_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_machine_attr = NULL_TREE;
3876 tree array_ptr_quals = NULL_TREE;
3877 int array_parm_static = 0;
3879 if (decl_context == BITFIELD)
3880 bitfield = 1, decl_context = FIELD;
3882 if (decl_context == FUNCDEF)
3883 funcdef_flag = 1, decl_context = NORMAL;
3885 /* Look inside a declarator for the name being declared
3886 and get it as a string, for an error message. */
3888 register tree decl = declarator;
3892 switch (TREE_CODE (decl))
3897 innermost_code = TREE_CODE (decl);
3898 decl = TREE_OPERAND (decl, 0);
3901 case IDENTIFIER_NODE:
3902 name = IDENTIFIER_POINTER (decl);
3913 /* A function definition's declarator must have the form of
3914 a function declarator. */
3916 if (funcdef_flag && innermost_code != CALL_EXPR)
3919 /* Anything declared one level down from the top level
3920 must be one of the parameters of a function
3921 (because the body is at least two levels down). */
3923 /* If this looks like a function definition, make it one,
3924 even if it occurs where parms are expected.
3925 Then store_parm_decls will reject it and not use it as a parm. */
3926 if (decl_context == NORMAL && !funcdef_flag
3927 && current_binding_level->parm_flag)
3928 decl_context = PARM;
3930 /* Look through the decl specs and record which ones appear.
3931 Some typespecs are defined as built-in typenames.
3932 Others, the ones that are modifiers of other types,
3933 are represented by bits in SPECBITS: set the bits for
3934 the modifiers that appear. Storage class keywords are also in SPECBITS.
3936 If there is a typedef name or a type, store the type in TYPE.
3937 This includes builtin typedefs such as `int'.
3939 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3940 and did not come from a user typedef.
3942 Set LONGLONG if `long' is mentioned twice. */
3944 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3946 register tree id = TREE_VALUE (spec);
3948 if (id == ridpointers[(int) RID_INT])
3950 if (id == ridpointers[(int) RID_CHAR])
3953 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3955 enum rid i = C_RID_CODE (id);
3956 if ((int) i <= (int) RID_LAST_MODIFIER)
3958 if (i == RID_LONG && (specbits & (1 << (int) i)))
3961 error ("`long long long' is too long for GCC");
3964 if (pedantic && !flag_isoc99 && ! in_system_header
3966 pedwarn ("ISO C89 does not support `long long'");
3970 else if (specbits & (1 << (int) i))
3971 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3972 specbits |= 1 << (int) i;
3977 error ("two or more data types in declaration of `%s'", name);
3978 /* Actual typedefs come to us as TYPE_DECL nodes. */
3979 else if (TREE_CODE (id) == TYPE_DECL)
3981 type = TREE_TYPE (id);
3982 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3985 /* Built-in types come as identifiers. */
3986 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3988 register tree t = lookup_name (id);
3989 if (TREE_TYPE (t) == error_mark_node)
3991 else if (!t || TREE_CODE (t) != TYPE_DECL)
3992 error ("`%s' fails to be a typedef or built in type",
3993 IDENTIFIER_POINTER (id));
3996 type = TREE_TYPE (t);
4000 else if (TREE_CODE (id) != ERROR_MARK)
4007 typedef_type = type;
4009 size_varies = C_TYPE_VARIABLE_SIZE (type);
4011 /* No type at all: default to `int', and set DEFAULTED_INT
4012 because it was not a user-defined typedef. */
4016 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4017 | (1 << (int) RID_SIGNED)
4018 | (1 << (int) RID_UNSIGNED)
4019 | (1 << (int) RID_COMPLEX))))
4020 /* Don't warn about typedef foo = bar. */
4021 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4022 && ! in_system_header)
4024 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4025 and this is a function, or if -Wimplicit; prefer the former
4026 warning since it is more explicit. */
4027 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4029 warn_about_return_type = 1;
4030 else if (warn_implicit_int || flag_isoc99)
4031 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4036 type = integer_type_node;
4039 /* Now process the modifiers that were specified
4040 and check for invalid combinations. */
4042 /* Long double is a special combination. */
4044 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4045 && TYPE_MAIN_VARIANT (type) == double_type_node)
4047 specbits &= ~(1 << (int) RID_LONG);
4048 type = long_double_type_node;
4051 /* Check all other uses of type modifiers. */
4053 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4054 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4058 if ((specbits & 1 << (int) RID_LONG)
4059 && (specbits & 1 << (int) RID_SHORT))
4060 error ("both long and short specified for `%s'", name);
4061 else if (((specbits & 1 << (int) RID_LONG)
4062 || (specbits & 1 << (int) RID_SHORT))
4064 error ("long or short specified with char for `%s'", name);
4065 else if (((specbits & 1 << (int) RID_LONG)
4066 || (specbits & 1 << (int) RID_SHORT))
4067 && TREE_CODE (type) == REAL_TYPE)
4069 static int already = 0;
4071 error ("long or short specified with floating type for `%s'", name);
4072 if (! already && ! pedantic)
4074 error ("the only valid combination is `long double'");
4078 else if ((specbits & 1 << (int) RID_SIGNED)
4079 && (specbits & 1 << (int) RID_UNSIGNED))
4080 error ("both signed and unsigned specified for `%s'", name);
4081 else if (TREE_CODE (type) != INTEGER_TYPE)
4082 error ("long, short, signed or unsigned invalid for `%s'", name);
4086 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4088 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4090 if (flag_pedantic_errors)
4095 /* Discard the type modifiers if they are invalid. */
4098 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4099 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4104 if ((specbits & (1 << (int) RID_COMPLEX))
4105 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4107 error ("complex invalid for `%s'", name);
4108 specbits &= ~(1 << (int) RID_COMPLEX);
4111 /* Decide whether an integer type is signed or not.
4112 Optionally treat bitfields as signed by default. */
4113 if (specbits & 1 << (int) RID_UNSIGNED
4114 /* Traditionally, all bitfields are unsigned. */
4115 || (bitfield && flag_traditional
4116 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4117 || (bitfield && ! flag_signed_bitfields
4118 && (explicit_int || defaulted_int || explicit_char
4119 /* A typedef for plain `int' without `signed'
4120 can be controlled just like plain `int'. */
4121 || ! (typedef_decl != 0
4122 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4123 && TREE_CODE (type) != ENUMERAL_TYPE
4124 && !(specbits & 1 << (int) RID_SIGNED)))
4127 type = long_long_unsigned_type_node;
4128 else if (specbits & 1 << (int) RID_LONG)
4129 type = long_unsigned_type_node;
4130 else if (specbits & 1 << (int) RID_SHORT)
4131 type = short_unsigned_type_node;
4132 else if (type == char_type_node)
4133 type = unsigned_char_type_node;
4134 else if (typedef_decl)
4135 type = unsigned_type (type);
4137 type = unsigned_type_node;
4139 else if ((specbits & 1 << (int) RID_SIGNED)
4140 && type == char_type_node)
4141 type = signed_char_type_node;
4143 type = long_long_integer_type_node;
4144 else if (specbits & 1 << (int) RID_LONG)
4145 type = long_integer_type_node;
4146 else if (specbits & 1 << (int) RID_SHORT)
4147 type = short_integer_type_node;
4149 if (specbits & 1 << (int) RID_COMPLEX)
4151 if (pedantic && !flag_isoc99)
4152 pedwarn ("ISO C89 does not support complex types");
4153 /* If we just have "complex", it is equivalent to
4154 "complex double", but if any modifiers at all are specified it is
4155 the complex form of TYPE. E.g, "complex short" is
4156 "complex short int". */
4158 if (defaulted_int && ! longlong
4159 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4160 | (1 << (int) RID_SIGNED)
4161 | (1 << (int) RID_UNSIGNED))))
4164 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4165 type = complex_double_type_node;
4167 else if (type == integer_type_node)
4170 pedwarn ("ISO C does not support complex integer types");
4171 type = complex_integer_type_node;
4173 else if (type == float_type_node)
4174 type = complex_float_type_node;
4175 else if (type == double_type_node)
4176 type = complex_double_type_node;
4177 else if (type == long_double_type_node)
4178 type = complex_long_double_type_node;
4182 pedwarn ("ISO C does not support complex integer types");
4183 type = build_complex_type (type);
4187 /* Figure out the type qualifiers for the declaration. There are
4188 two ways a declaration can become qualified. One is something
4189 like `const int i' where the `const' is explicit. Another is
4190 something like `typedef const int CI; CI i' where the type of the
4191 declaration contains the `const'. */
4192 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4193 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4194 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4195 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4196 if (constp > 1 && ! flag_isoc99)
4197 pedwarn ("duplicate `const'");
4198 if (restrictp > 1 && ! flag_isoc99)
4199 pedwarn ("duplicate `restrict'");
4200 if (volatilep > 1 && ! flag_isoc99)
4201 pedwarn ("duplicate `volatile'");
4202 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4203 type = TYPE_MAIN_VARIANT (type);
4204 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4205 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4206 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4208 /* Warn if two storage classes are given. Default to `auto'. */
4213 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4214 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4215 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4216 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4217 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4219 /* Warn about storage classes that are invalid for certain
4220 kinds of declarations (parameters, typenames, etc.). */
4223 error ("multiple storage classes in declaration of `%s'", name);
4224 else if (funcdef_flag
4226 & ((1 << (int) RID_REGISTER)
4227 | (1 << (int) RID_AUTO)
4228 | (1 << (int) RID_TYPEDEF))))
4230 if (specbits & 1 << (int) RID_AUTO
4231 && (pedantic || current_binding_level == global_binding_level))
4232 pedwarn ("function definition declared `auto'");
4233 if (specbits & 1 << (int) RID_REGISTER)
4234 error ("function definition declared `register'");
4235 if (specbits & 1 << (int) RID_TYPEDEF)
4236 error ("function definition declared `typedef'");
4237 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4238 | (1 << (int) RID_AUTO));
4240 else if (decl_context != NORMAL && nclasses > 0)
4242 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4246 switch (decl_context)
4249 error ("storage class specified for structure field `%s'",
4253 error ("storage class specified for parameter `%s'", name);
4256 error ("storage class specified for typename");
4259 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4260 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4261 | (1 << (int) RID_EXTERN));
4264 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4266 /* `extern' with initialization is invalid if not at top level. */
4267 if (current_binding_level == global_binding_level)
4268 warning ("`%s' initialized and declared `extern'", name);
4270 error ("`%s' has both `extern' and initializer", name);
4272 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4273 && current_binding_level != global_binding_level)
4274 error ("nested function `%s' declared `extern'", name);
4275 else if (current_binding_level == global_binding_level
4276 && specbits & (1 << (int) RID_AUTO))
4277 error ("top-level declaration of `%s' specifies `auto'", name);
4280 /* Now figure out the structure of the declarator proper.
4281 Descend through it, creating more complex types, until we reach
4282 the declared identifier (or NULL_TREE, in an absolute declarator). */
4284 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4286 if (type == error_mark_node)
4288 declarator = TREE_OPERAND (declarator, 0);
4292 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4293 an INDIRECT_REF (for *...),
4294 a CALL_EXPR (for ...(...)),
4295 an identifier (for the name being declared)
4296 or a null pointer (for the place in an absolute declarator
4297 where the name was omitted).
4298 For the last two cases, we have just exited the loop.
4300 At this point, TYPE is the type of elements of an array,
4301 or for a function to return, or for a pointer to point to.
4302 After this sequence of ifs, TYPE is the type of the
4303 array or function or pointer, and DECLARATOR has had its
4304 outermost layer removed. */
4306 if (array_ptr_quals != NULL_TREE || array_parm_static)
4308 /* Only the innermost declarator (making a parameter be of
4309 array type which is converted to pointer type)
4310 may have static or type qualifiers. */
4311 error ("static or type qualifiers in non-parameter array declarator");
4312 array_ptr_quals = NULL_TREE;
4313 array_parm_static = 0;
4316 if (TREE_CODE (declarator) == ARRAY_REF)
4318 register tree itype = NULL_TREE;
4319 register tree size = TREE_OPERAND (declarator, 1);
4320 /* The index is a signed object `sizetype' bits wide. */
4321 tree index_type = signed_type (sizetype);
4323 array_ptr_quals = TREE_TYPE (declarator);
4324 array_parm_static = TREE_STATIC (declarator);
4326 declarator = TREE_OPERAND (declarator, 0);
4328 /* Check for some types that there cannot be arrays of. */
4330 if (VOID_TYPE_P (type))
4332 error ("declaration of `%s' as array of voids", name);
4333 type = error_mark_node;
4336 if (TREE_CODE (type) == FUNCTION_TYPE)
4338 error ("declaration of `%s' as array of functions", name);
4339 type = error_mark_node;
4342 if (size == error_mark_node)
4343 type = error_mark_node;
4345 if (type == error_mark_node)
4348 /* If size was specified, set ITYPE to a range-type for that size.
4349 Otherwise, ITYPE remains null. finish_decl may figure it out
4350 from an initial value. */
4354 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4355 STRIP_TYPE_NOPS (size);
4357 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4359 error ("size of array `%s' has non-integer type", name);
4360 size = integer_one_node;
4363 if (pedantic && integer_zerop (size))
4364 pedwarn ("ISO C forbids zero-size array `%s'", name);
4366 if (TREE_CODE (size) == INTEGER_CST)
4368 constant_expression_warning (size);
4369 if (tree_int_cst_sgn (size) < 0)
4371 error ("size of array `%s' is negative", name);
4372 size = integer_one_node;
4377 /* Make sure the array size remains visibly nonconstant
4378 even if it is (eg) a const variable with known value. */
4383 if (TREE_CONSTANT (size))
4384 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4387 pedwarn ("ISO C89 forbids variable-size array `%s'",
4392 if (integer_zerop (size))
4394 /* A zero-length array cannot be represented with an
4395 unsigned index type, which is what we'll get with
4396 build_index_type. Create an open-ended range instead. */
4397 itype = build_range_type (sizetype, size, NULL_TREE);
4401 /* Compute the maximum valid index, that is, size - 1.
4402 Do the calculation in index_type, so that if it is
4403 a variable the computations will be done in the
4405 itype = fold (build (MINUS_EXPR, index_type,
4406 convert (index_type, size),
4407 convert (index_type, size_one_node)));
4409 /* If that overflowed, the array is too big.
4410 ??? While a size of INT_MAX+1 technically shouldn't
4411 cause an overflow (because we subtract 1), the overflow
4412 is recorded during the conversion to index_type, before
4413 the subtraction. Handling this case seems like an
4414 unnecessary complication. */
4415 if (TREE_OVERFLOW (itype))
4417 error ("size of array `%s' is too large", name);
4418 type = error_mark_node;
4423 itype = variable_size (itype);
4424 itype = build_index_type (itype);
4427 else if (decl_context == FIELD)
4429 /* ??? Need to check somewhere that this is a structure
4430 and not a union, that this field is last, and that
4431 this structure has at least one other named member. */
4433 if (pedantic && !flag_isoc99 && !in_system_header)
4434 pedwarn ("ISO C89 does not support flexible array members");
4436 /* ISO C99 Flexible array members are effectively identical
4437 to GCC's zero-length array extension. */
4438 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4441 /* If pedantic, complain about arrays of incomplete types. */
4443 if (pedantic && !COMPLETE_TYPE_P (type))
4444 pedwarn ("array type has incomplete element type");
4447 /* We shouldn't have a function type here at all!
4448 Functions aren't allowed as array elements. */
4449 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4450 && (constp || volatilep))
4451 pedwarn ("ANSI C forbids const or volatile function types");
4454 /* Build the array type itself, then merge any constancy or
4455 volatility into the target type. We must do it in this order
4456 to ensure that the TYPE_MAIN_VARIANT field of the array type
4457 is set correctly. */
4459 type = build_array_type (type, itype);
4461 type = c_build_qualified_type (type, type_quals);
4464 C_TYPE_VARIABLE_SIZE (type) = 1;
4466 /* The GCC extension for zero-length arrays differs from
4467 ISO flexible array members in that sizeof yields zero. */
4468 if (size && integer_zerop (size))
4471 TYPE_SIZE (type) = bitsize_zero_node;
4472 TYPE_SIZE_UNIT (type) = size_zero_node;
4474 if (decl_context != PARM
4475 && (array_ptr_quals != NULL_TREE || array_parm_static))
4477 error ("static or type qualifiers in non-parameter array declarator");
4478 array_ptr_quals = NULL_TREE;
4479 array_parm_static = 0;
4482 else if (TREE_CODE (declarator) == CALL_EXPR)
4486 /* Declaring a function type.
4487 Make sure we have a valid type for the function to return. */
4488 if (type == error_mark_node)
4493 /* Warn about some types functions can't return. */
4495 if (TREE_CODE (type) == FUNCTION_TYPE)
4497 error ("`%s' declared as function returning a function", name);
4498 type = integer_type_node;
4500 if (TREE_CODE (type) == ARRAY_TYPE)
4502 error ("`%s' declared as function returning an array", name);
4503 type = integer_type_node;
4506 #ifndef TRADITIONAL_RETURN_FLOAT
4507 /* Traditionally, declaring return type float means double. */
4509 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4510 type = double_type_node;
4511 #endif /* TRADITIONAL_RETURN_FLOAT */
4513 /* Construct the function type and go to the next
4514 inner layer of declarator. */
4516 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4518 /* Say it's a definition
4519 only for the CALL_EXPR
4520 closest to the identifier. */
4521 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4522 /* Type qualifiers before the return type of the function
4523 qualify the return type, not the function type. */
4526 /* Type qualifiers on a function return type are normally
4527 permitted by the standard but have no effect, so give a
4528 warning at -W. Qualifiers on a void return type have
4529 meaning as a GNU extension, and are banned on function
4530 definitions in ISO C. FIXME: strictly we shouldn't
4531 pedwarn for qualified void return types except on function
4532 definitions, but not doing so could lead to the undesirable
4533 state of a "volatile void" function return type not being
4534 warned about, and a use of the function being compiled
4535 with GNU semantics, with no diagnostics under -pedantic. */
4536 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4537 pedwarn ("ISO C forbids qualified void function return type");
4538 else if (extra_warnings
4539 && !(VOID_TYPE_P (type)
4540 && type_quals == TYPE_QUAL_VOLATILE))
4541 warning ("type qualifiers ignored on function return type");
4543 type = c_build_qualified_type (type, type_quals);
4545 type_quals = TYPE_UNQUALIFIED;
4547 type = build_function_type (type, arg_types);
4548 declarator = TREE_OPERAND (declarator, 0);
4550 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4551 the formal parameter list of this FUNCTION_TYPE to point to
4552 the FUNCTION_TYPE node itself. */
4557 for (link = last_function_parm_tags;
4559 link = TREE_CHAIN (link))
4560 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4563 else if (TREE_CODE (declarator) == INDIRECT_REF)
4565 /* Merge any constancy or volatility into the target type
4568 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4570 pedwarn ("ISO C forbids qualified function types");
4572 type = c_build_qualified_type (type, type_quals);
4573 type_quals = TYPE_UNQUALIFIED;
4576 type = build_pointer_type (type);
4578 /* Process a list of type modifier keywords
4579 (such as const or volatile) that were given inside the `*'. */
4581 if (TREE_TYPE (declarator))
4583 register tree typemodlist;
4589 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4590 typemodlist = TREE_CHAIN (typemodlist))
4592 tree qualifier = TREE_VALUE (typemodlist);
4594 if (C_IS_RESERVED_WORD (qualifier))
4596 if (C_RID_CODE (qualifier) == RID_CONST)
4598 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4600 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4610 error ("invalid type modifier within pointer declarator");
4611 if (constp > 1 && ! flag_isoc99)
4612 pedwarn ("duplicate `const'");
4613 if (volatilep > 1 && ! flag_isoc99)
4614 pedwarn ("duplicate `volatile'");
4615 if (restrictp > 1 && ! flag_isoc99)
4616 pedwarn ("duplicate `restrict'");
4618 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4619 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4620 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4623 declarator = TREE_OPERAND (declarator, 0);
4630 /* Now TYPE has the actual type. */
4632 /* Did array size calculations overflow? */
4634 if (TREE_CODE (type) == ARRAY_TYPE
4635 && COMPLETE_TYPE_P (type)
4636 && TREE_OVERFLOW (TYPE_SIZE (type)))
4638 error ("size of array `%s' is too large", name);
4639 /* If we proceed with the array type as it is, we'll eventully
4640 crash in tree_low_cst(). */
4641 type = error_mark_node;
4644 /* If this is declaring a typedef name, return a TYPE_DECL. */
4646 if (specbits & (1 << (int) RID_TYPEDEF))
4649 /* Note that the grammar rejects storage classes
4650 in typenames, fields or parameters */
4651 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4653 pedwarn ("ISO C forbids qualified function types");
4655 type = c_build_qualified_type (type, type_quals);
4656 decl = build_decl (TYPE_DECL, declarator, type);
4657 if ((specbits & (1 << (int) RID_SIGNED))
4658 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4659 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4663 /* Detect the case of an array type of unspecified size
4664 which came, as such, direct from a typedef name.
4665 We must copy the type, so that each identifier gets
4666 a distinct type, so that each identifier's size can be
4667 controlled separately by its own initializer. */
4669 if (type != 0 && typedef_type != 0
4670 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4671 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4673 type = build_array_type (TREE_TYPE (type), 0);
4675 C_TYPE_VARIABLE_SIZE (type) = 1;
4678 /* If this is a type name (such as, in a cast or sizeof),
4679 compute the type and return it now. */
4681 if (decl_context == TYPENAME)
4683 /* Note that the grammar rejects storage classes
4684 in typenames, fields or parameters */
4685 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4687 pedwarn ("ISO C forbids const or volatile function types");
4689 type = c_build_qualified_type (type, type_quals);
4693 /* Aside from typedefs and type names (handle above),
4694 `void' at top level (not within pointer)
4695 is allowed only in public variables.
4696 We don't complain about parms either, but that is because
4697 a better error message can be made later. */
4699 if (VOID_TYPE_P (type) && decl_context != PARM
4700 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4701 && ((specbits & (1 << (int) RID_EXTERN))
4702 || (current_binding_level == global_binding_level
4704 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4706 error ("variable or field `%s' declared void", name);
4707 type = integer_type_node;
4710 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4711 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4716 if (decl_context == PARM)
4718 tree type_as_written;
4721 /* A parameter declared as an array of T is really a pointer to T.
4722 One declared as a function is really a pointer to a function. */
4724 if (TREE_CODE (type) == ARRAY_TYPE)
4726 /* Transfer const-ness of array into that of type pointed to. */
4727 type = TREE_TYPE (type);
4729 type = c_build_qualified_type (type, type_quals);
4730 type = build_pointer_type (type);
4731 type_quals = TYPE_UNQUALIFIED;
4732 if (array_ptr_quals)
4734 tree new_ptr_quals, new_ptr_attrs;
4736 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4737 /* We don't yet implement attributes in this context. */
4738 if (new_ptr_attrs != NULL_TREE)
4739 warning ("attributes in parameter array declarator ignored");
4744 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4746 tree qualifier = TREE_VALUE (new_ptr_quals);
4748 if (C_IS_RESERVED_WORD (qualifier))
4750 if (C_RID_CODE (qualifier) == RID_CONST)
4752 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4754 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4764 error ("invalid type modifier within array declarator");
4766 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4767 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4768 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4772 else if (TREE_CODE (type) == FUNCTION_TYPE)
4774 if (pedantic && type_quals)
4775 pedwarn ("ISO C forbids qualified function types");
4777 type = c_build_qualified_type (type, type_quals);
4778 type = build_pointer_type (type);
4779 type_quals = TYPE_UNQUALIFIED;
4781 else if (type_quals)
4782 type = c_build_qualified_type (type, type_quals);
4784 type_as_written = type;
4786 decl = build_decl (PARM_DECL, declarator, type);
4788 C_DECL_VARIABLE_SIZE (decl) = 1;
4790 /* Compute the type actually passed in the parmlist,
4791 for the case where there is no prototype.
4792 (For example, shorts and chars are passed as ints.)
4793 When there is a prototype, this is overridden later. */
4795 if (type == error_mark_node)
4796 promoted_type = type;
4799 promoted_type = simple_type_promotes_to (type);
4800 if (! promoted_type)
4801 promoted_type = type;
4804 DECL_ARG_TYPE (decl) = promoted_type;
4805 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4807 else if (decl_context == FIELD)
4809 /* Structure field. It may not be a function. */
4811 if (TREE_CODE (type) == FUNCTION_TYPE)
4813 error ("field `%s' declared as a function", name);
4814 type = build_pointer_type (type);
4816 else if (TREE_CODE (type) != ERROR_MARK
4817 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4819 error ("field `%s' has incomplete type", name);
4820 type = error_mark_node;
4822 /* Move type qualifiers down to element of an array. */
4823 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4825 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4827 TYPE_DOMAIN (type));
4829 /* Leave the field const or volatile as well. */
4830 type_quals = TYPE_UNQUALIFIED;
4833 decl = build_decl (FIELD_DECL, declarator, type);
4834 DECL_NONADDRESSABLE_P (decl) = bitfield;
4837 C_DECL_VARIABLE_SIZE (decl) = 1;
4839 else if (TREE_CODE (type) == FUNCTION_TYPE)
4841 /* Every function declaration is "external"
4842 except for those which are inside a function body
4843 in which `auto' is used.
4844 That is a case not specified by ANSI C,
4845 and we use it for forward declarations for nested functions. */
4846 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4847 || current_binding_level == global_binding_level);
4849 if (specbits & (1 << (int) RID_AUTO)
4850 && (pedantic || current_binding_level == global_binding_level))
4851 pedwarn ("invalid storage class for function `%s'", name);
4852 if (specbits & (1 << (int) RID_REGISTER))
4853 error ("invalid storage class for function `%s'", name);
4854 /* Function declaration not at top level.
4855 Storage classes other than `extern' are not allowed
4856 and `extern' makes no difference. */
4857 if (current_binding_level != global_binding_level
4858 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4860 pedwarn ("invalid storage class for function `%s'", name);
4862 decl = build_decl (FUNCTION_DECL, declarator, type);
4863 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4865 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4866 pedwarn ("ISO C forbids qualified function types");
4868 /* GNU C interprets a `volatile void' return type to indicate
4869 that the function does not return. */
4870 if ((type_quals & TYPE_QUAL_VOLATILE)
4871 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4872 warning ("`noreturn' function returns non-void value");
4875 DECL_EXTERNAL (decl) = 1;
4876 /* Record absence of global scope for `static' or `auto'. */
4878 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4880 /* Record presence of `inline', if it is reasonable. */
4883 if (MAIN_NAME_P (declarator))
4884 warning ("cannot inline function `main'");
4886 /* Assume that otherwise the function can be inlined. */
4887 DECL_INLINE (decl) = 1;
4889 if (specbits & (1 << (int) RID_EXTERN))
4890 current_extern_inline = 1;
4895 /* It's a variable. */
4896 /* An uninitialized decl with `extern' is a reference. */
4897 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4899 /* Move type qualifiers down to element of an array. */
4900 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4902 int saved_align = TYPE_ALIGN(type);
4903 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4905 TYPE_DOMAIN (type));
4906 TYPE_ALIGN (type) = saved_align;
4907 #if 0 /* Leave the variable const or volatile as well. */
4908 type_quals = TYPE_UNQUALIFIED;
4911 else if (type_quals)
4912 type = c_build_qualified_type (type, type_quals);
4914 decl = build_decl (VAR_DECL, declarator, type);
4916 C_DECL_VARIABLE_SIZE (decl) = 1;
4919 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4921 DECL_EXTERNAL (decl) = extern_ref;
4922 /* At top level, the presence of a `static' or `register' storage
4923 class specifier, or the absence of all storage class specifiers
4924 makes this declaration a definition (perhaps tentative). Also,
4925 the absence of both `static' and `register' makes it public. */
4926 if (current_binding_level == global_binding_level)
4930 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4931 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4933 /* Not at top level, only `static' makes a static definition. */
4936 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4937 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4941 /* Record `register' declaration for warnings on &
4942 and in case doing stupid register allocation. */
4944 if (specbits & (1 << (int) RID_REGISTER))
4945 DECL_REGISTER (decl) = 1;
4947 /* Record constancy and volatility. */
4948 c_apply_type_quals_to_decl (type_quals, decl);
4950 /* If a type has volatile components, it should be stored in memory.
4951 Otherwise, the fact that those components are volatile
4952 will be ignored, and would even crash the compiler. */
4953 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4954 mark_addressable (decl);
4960 /* Decode the parameter-list info for a function type or function definition.
4961 The argument is the value returned by `get_parm_info' (or made in parse.y
4962 if there is an identifier list instead of a parameter decl list).
4963 These two functions are separate because when a function returns
4964 or receives functions then each is called multiple times but the order
4965 of calls is different. The last call to `grokparms' is always the one
4966 that contains the formal parameter names of a function definition.
4968 Store in `last_function_parms' a chain of the decls of parms.
4969 Also store in `last_function_parm_tags' a chain of the struct, union,
4970 and enum tags declared among the parms.
4972 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4974 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4975 a mere declaration. A nonempty identifier-list gets an error message
4976 when FUNCDEF_FLAG is zero. */
4979 grokparms (parms_info, funcdef_flag)
4983 tree first_parm = TREE_CHAIN (parms_info);
4985 last_function_parms = TREE_PURPOSE (parms_info);
4986 last_function_parm_tags = TREE_VALUE (parms_info);
4988 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4989 && !in_system_header)
4990 warning ("function declaration isn't a prototype");
4993 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4996 pedwarn ("parameter names (without types) in function declaration");
4998 last_function_parms = first_parm;
5005 /* We no longer test FUNCDEF_FLAG.
5006 If the arg types are incomplete in a declaration,
5007 they must include undefined tags.
5008 These tags can never be defined in the scope of the declaration,
5009 so the types can never be completed,
5010 and no call can be compiled successfully. */
5012 /* In a fcn definition, arg types must be complete. */
5015 for (parm = last_function_parms, typelt = first_parm;
5017 parm = TREE_CHAIN (parm))
5018 /* Skip over any enumeration constants declared here. */
5019 if (TREE_CODE (parm) == PARM_DECL)
5021 /* Barf if the parameter itself has an incomplete type. */
5022 tree type = TREE_VALUE (typelt);
5023 if (type == error_mark_node)
5025 if (!COMPLETE_TYPE_P (type))
5027 if (funcdef_flag && DECL_NAME (parm) != 0)
5028 error ("parameter `%s' has incomplete type",
5029 IDENTIFIER_POINTER (DECL_NAME (parm)));
5031 warning ("parameter has incomplete type");
5034 TREE_VALUE (typelt) = error_mark_node;
5035 TREE_TYPE (parm) = error_mark_node;
5039 /* This has been replaced by parm_tags_warning, which
5040 uses a more accurate criterion for what to warn
5044 /* Now warn if is a pointer to an incomplete type. */
5045 while (TREE_CODE (type) == POINTER_TYPE
5046 || TREE_CODE (type) == REFERENCE_TYPE)
5047 type = TREE_TYPE (type);
5048 type = TYPE_MAIN_VARIANT (type);
5049 if (!COMPLETE_TYPE_P (type))
5051 if (DECL_NAME (parm) != 0)
5052 warning ("parameter `%s' points to incomplete type",
5053 IDENTIFIER_POINTER (DECL_NAME (parm)));
5055 warning ("parameter points to incomplete type");
5059 typelt = TREE_CHAIN (typelt);
5066 /* Return a tree_list node with info on a parameter list just parsed.
5067 The TREE_PURPOSE is a chain of decls of those parms.
5068 The TREE_VALUE is a list of structure, union and enum tags defined.
5069 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5070 This tree_list node is later fed to `grokparms'.
5072 VOID_AT_END nonzero means append `void' to the end of the type-list.
5073 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5076 get_parm_info (void_at_end)
5079 register tree decl, t;
5080 register tree types = 0;
5082 tree tags = gettags ();
5083 tree parms = getdecls ();
5085 tree order = current_binding_level->parm_order;
5087 /* Just `void' (and no ellipsis) is special. There are really no parms.
5088 But if the `void' is qualified (by `const' or `volatile') or has a
5089 storage class specifier (`register'), then the behavior is undefined;
5090 by not counting it as the special case of `void' we will cause an
5091 error later. Typedefs for `void' are OK (see DR#157). */
5092 if (void_at_end && parms != 0
5093 && TREE_CHAIN (parms) == 0
5094 && VOID_TYPE_P (TREE_TYPE (parms))
5095 && ! TREE_THIS_VOLATILE (parms)
5096 && ! TREE_READONLY (parms)
5097 && ! DECL_REGISTER (parms)
5098 && DECL_NAME (parms) == 0)
5101 storedecls (NULL_TREE);
5102 return tree_cons (NULL_TREE, NULL_TREE,
5103 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5106 /* Extract enumerator values and other non-parms declared with the parms.
5107 Likewise any forward parm decls that didn't have real parm decls. */
5108 for (decl = parms; decl;)
5110 tree next = TREE_CHAIN (decl);
5112 if (TREE_CODE (decl) != PARM_DECL)
5114 TREE_CHAIN (decl) = new_parms;
5117 else if (TREE_ASM_WRITTEN (decl))
5119 error_with_decl (decl,
5120 "parameter `%s' has just a forward declaration");
5121 TREE_CHAIN (decl) = new_parms;
5127 /* Put the parm decls back in the order they were in in the parm list. */
5128 for (t = order; t; t = TREE_CHAIN (t))
5131 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5133 TREE_CHAIN (TREE_VALUE (t)) = 0;
5136 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5139 /* Store the parmlist in the binding level since the old one
5140 is no longer a valid list. (We have changed the chain pointers.) */
5141 storedecls (new_parms);
5143 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5144 /* There may also be declarations for enumerators if an enumeration
5145 type is declared among the parms. Ignore them here. */
5146 if (TREE_CODE (decl) == PARM_DECL)
5148 /* Since there is a prototype,
5149 args are passed in their declared types. */
5150 tree type = TREE_TYPE (decl);
5151 DECL_ARG_TYPE (decl) = type;
5152 if (PROMOTE_PROTOTYPES
5153 && INTEGRAL_TYPE_P (type)
5154 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5155 DECL_ARG_TYPE (decl) = integer_type_node;
5157 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5158 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5159 && DECL_NAME (decl) == 0)
5161 error ("`void' in parameter list must be the entire list");
5167 return tree_cons (new_parms, tags,
5168 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5170 return tree_cons (new_parms, tags, nreverse (types));
5173 /* At end of parameter list, warn about any struct, union or enum tags
5174 defined within. Do so because these types cannot ever become complete. */
5177 parmlist_tags_warning ()
5182 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5184 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5185 /* An anonymous union parm type is meaningful as a GNU extension.
5186 So don't warn for that. */
5187 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5189 if (TREE_PURPOSE (elt) != 0)
5190 warning ("`%s %s' declared inside parameter list",
5191 (code == RECORD_TYPE ? "struct"
5192 : code == UNION_TYPE ? "union"
5194 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5197 /* For translation these need to be seperate warnings */
5198 if (code == RECORD_TYPE)
5199 warning ("anonymous struct declared inside parameter list");
5200 else if (code == UNION_TYPE)
5201 warning ("anonymous union declared inside parameter list");
5203 warning ("anonymous enum declared inside parameter list");
5207 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5213 /* Get the struct, enum or union (CODE says which) with tag NAME.
5214 Define the tag as a forward-reference if it is not defined. */
5217 xref_tag (code, name)
5218 enum tree_code code;
5221 /* If a cross reference is requested, look up the type
5222 already defined for this tag and return it. */
5224 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5225 /* If this is the right type of tag, return what we found.
5226 (This reference will be shadowed by shadow_tag later if appropriate.)
5227 If this is the wrong type of tag, do not return it. If it was the
5228 wrong type in the same binding level, we will have had an error
5229 message already; if in a different binding level and declaring
5230 a name, pending_xref_error will give an error message; but if in a
5231 different binding level and not declaring a name, this tag should
5232 shadow the previous declaration of a different type of tag, and
5233 this would not work properly if we return the reference found.
5234 (For example, with "struct foo" in an outer scope, "union foo;"
5235 must shadow that tag with a new one of union type.) */
5236 if (ref && TREE_CODE (ref) == code)
5239 /* If no such tag is yet defined, create a forward-reference node
5240 and record it as the "definition".
5241 When a real declaration of this type is found,
5242 the forward-reference will be altered into a real type. */
5244 ref = make_node (code);
5245 if (code == ENUMERAL_TYPE)
5247 /* Give the type a default layout like unsigned int
5248 to avoid crashing if it does not get defined. */
5249 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5250 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5251 TYPE_USER_ALIGN (ref) = 0;
5252 TREE_UNSIGNED (ref) = 1;
5253 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5254 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5255 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5258 pushtag (name, ref);
5263 /* Make sure that the tag NAME is defined *in the current binding level*
5264 at least as a forward reference.
5265 CODE says which kind of tag NAME ought to be. */
5268 start_struct (code, name)
5269 enum tree_code code;
5272 /* If there is already a tag defined at this binding level
5273 (as a forward reference), just return it. */
5275 register tree ref = 0;
5278 ref = lookup_tag (code, name, current_binding_level, 1);
5279 if (ref && TREE_CODE (ref) == code)
5281 C_TYPE_BEING_DEFINED (ref) = 1;
5282 TYPE_PACKED (ref) = flag_pack_struct;
5283 if (TYPE_FIELDS (ref))
5284 error ("redefinition of `%s %s'",
5285 code == UNION_TYPE ? "union" : "struct",
5286 IDENTIFIER_POINTER (name));
5291 /* Otherwise create a forward-reference just so the tag is in scope. */
5293 ref = make_node (code);
5294 pushtag (name, ref);
5295 C_TYPE_BEING_DEFINED (ref) = 1;
5296 TYPE_PACKED (ref) = flag_pack_struct;
5300 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5301 of a structure component, returning a FIELD_DECL node.
5302 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5304 This is done during the parsing of the struct declaration.
5305 The FIELD_DECL nodes are chained together and the lot of them
5306 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5309 grokfield (filename, line, declarator, declspecs, width)
5310 const char *filename ATTRIBUTE_UNUSED;
5311 int line ATTRIBUTE_UNUSED;
5312 tree declarator, declspecs, width;
5316 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5318 finish_decl (value, NULL_TREE, NULL_TREE);
5319 DECL_INITIAL (value) = width;
5321 maybe_objc_check_decl (value);
5325 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5326 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5327 ATTRIBUTES are attributes to be applied to the structure. */
5330 finish_struct (t, fieldlist, attributes)
5336 int toplevel = global_binding_level == current_binding_level;
5337 int saw_named_field;
5339 /* If this type was previously laid out as a forward reference,
5340 make sure we lay it out again. */
5344 decl_attributes (&t, attributes, 0);
5346 /* Nameless union parm types are useful as GCC extension. */
5347 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5348 /* Otherwise, warn about any struct or union def. in parmlist. */
5349 if (in_parm_level_p ())
5352 pedwarn ("%s defined inside parms",
5353 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5354 else if (! flag_traditional)
5355 warning ("%s defined inside parms",
5356 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5361 for (x = fieldlist; x; x = TREE_CHAIN (x))
5362 if (DECL_NAME (x) != 0)
5366 pedwarn ("%s has no %s",
5367 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5368 fieldlist ? _("named members") : _("members"));
5371 /* Install struct as DECL_CONTEXT of each field decl.
5372 Also process specified field sizes,m which is found in the DECL_INITIAL.
5373 Store 0 there, except for ": 0" fields (so we can find them
5374 and delete them, below). */
5376 saw_named_field = 0;
5377 for (x = fieldlist; x; x = TREE_CHAIN (x))
5379 DECL_CONTEXT (x) = t;
5380 DECL_PACKED (x) |= TYPE_PACKED (t);
5382 /* If any field is const, the structure type is pseudo-const. */
5383 if (TREE_READONLY (x))
5384 C_TYPE_FIELDS_READONLY (t) = 1;
5387 /* A field that is pseudo-const makes the structure likewise. */
5388 tree t1 = TREE_TYPE (x);
5389 while (TREE_CODE (t1) == ARRAY_TYPE)
5390 t1 = TREE_TYPE (t1);
5391 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5392 && C_TYPE_FIELDS_READONLY (t1))
5393 C_TYPE_FIELDS_READONLY (t) = 1;
5396 /* Any field that is volatile means variables of this type must be
5397 treated in some ways as volatile. */
5398 if (TREE_THIS_VOLATILE (x))
5399 C_TYPE_FIELDS_VOLATILE (t) = 1;
5401 /* Any field of nominal variable size implies structure is too. */
5402 if (C_DECL_VARIABLE_SIZE (x))
5403 C_TYPE_VARIABLE_SIZE (t) = 1;
5405 /* Detect invalid nested redefinition. */
5406 if (TREE_TYPE (x) == t)
5407 error ("nested redefinition of `%s'",
5408 IDENTIFIER_POINTER (TYPE_NAME (t)));
5410 /* Detect invalid bit-field size. */
5411 if (DECL_INITIAL (x))
5412 STRIP_NOPS (DECL_INITIAL (x));
5413 if (DECL_INITIAL (x))
5415 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5416 constant_expression_warning (DECL_INITIAL (x));
5420 "bit-field `%s' width not an integer constant");
5421 DECL_INITIAL (x) = NULL;
5425 /* Detect invalid bit-field type. */
5426 if (DECL_INITIAL (x)
5427 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5428 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5429 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5431 error_with_decl (x, "bit-field `%s' has invalid type");
5432 DECL_INITIAL (x) = NULL;
5435 if (DECL_INITIAL (x) && pedantic
5436 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5437 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5438 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5439 /* Accept an enum that's equivalent to int or unsigned int. */
5440 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5441 && (TYPE_PRECISION (TREE_TYPE (x))
5442 == TYPE_PRECISION (integer_type_node))))
5443 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5445 /* Detect and ignore out of range field width and process valid
5447 if (DECL_INITIAL (x))
5450 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5451 max_width = CHAR_TYPE_SIZE;
5453 max_width = TYPE_PRECISION (TREE_TYPE (x));
5454 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5455 error_with_decl (x, "negative width in bit-field `%s'");
5456 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5457 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5458 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5459 error_with_decl (x, "zero width for bit-field `%s'");
5462 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5463 unsigned HOST_WIDE_INT width
5464 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5466 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5467 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5468 TREE_UNSIGNED (TREE_TYPE (x)))
5470 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5471 TREE_UNSIGNED (TREE_TYPE (x))))))
5472 warning_with_decl (x,
5473 "`%s' is narrower than values of its type");
5475 DECL_SIZE (x) = bitsize_int (width);
5476 DECL_BIT_FIELD (x) = 1;
5477 SET_DECL_C_BIT_FIELD (x);
5481 /* field size 0 => force desired amount of alignment. */
5482 #ifdef EMPTY_FIELD_BOUNDARY
5483 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5485 #ifdef PCC_BITFIELD_TYPE_MATTERS
5486 if (PCC_BITFIELD_TYPE_MATTERS)
5488 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5489 TYPE_ALIGN (TREE_TYPE (x)));
5490 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5497 else if (TREE_TYPE (x) != error_mark_node)
5499 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5500 : TYPE_ALIGN (TREE_TYPE (x)));
5502 /* Non-bit-fields are aligned for their type, except packed
5503 fields which require only BITS_PER_UNIT alignment. */
5504 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5505 if (! DECL_PACKED (x))
5506 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5509 DECL_INITIAL (x) = 0;
5511 /* Detect flexible array member in an invalid context. */
5512 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5513 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5514 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5515 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5517 if (TREE_CODE (t) == UNION_TYPE)
5518 error_with_decl (x, "flexible array member in union");
5519 else if (TREE_CHAIN (x) != NULL_TREE)
5520 error_with_decl (x, "flexible array member not at end of struct");
5521 else if (! saw_named_field)
5522 error_with_decl (x, "flexible array member in otherwise empty struct");
5525 saw_named_field = 1;
5528 /* Delete all duplicate fields from the fieldlist */
5529 for (x = fieldlist; x && TREE_CHAIN (x);)
5530 /* Anonymous fields aren't duplicates. */
5531 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5535 register tree y = fieldlist;
5539 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5545 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5547 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5548 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5554 /* Now we have the nearly final fieldlist. Record it,
5555 then lay out the structure or union (including the fields). */
5557 TYPE_FIELDS (t) = fieldlist;
5561 /* Delete all zero-width bit-fields from the fieldlist */
5563 tree *fieldlistp = &fieldlist;
5565 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5566 *fieldlistp = TREE_CHAIN (*fieldlistp);
5568 fieldlistp = &TREE_CHAIN (*fieldlistp);
5571 /* Now we have the truly final field list.
5572 Store it in this type and in the variants. */
5574 TYPE_FIELDS (t) = fieldlist;
5576 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5578 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5579 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5580 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5581 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5584 /* If this was supposed to be a transparent union, but we can't
5585 make it one, warn and turn off the flag. */
5586 if (TREE_CODE (t) == UNION_TYPE
5587 && TYPE_TRANSPARENT_UNION (t)
5588 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5590 TYPE_TRANSPARENT_UNION (t) = 0;
5591 warning ("union cannot be made transparent");
5594 /* If this structure or union completes the type of any previous
5595 variable declaration, lay it out and output its rtl. */
5597 if (current_binding_level->n_incomplete != 0)
5600 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5602 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5603 && TREE_CODE (decl) != TYPE_DECL)
5605 layout_decl (decl, 0);
5606 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5607 maybe_objc_check_decl (decl);
5608 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5611 --current_binding_level->n_incomplete;
5613 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5614 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5616 tree element = TREE_TYPE (decl);
5617 while (TREE_CODE (element) == ARRAY_TYPE)
5618 element = TREE_TYPE (element);
5620 layout_array_type (TREE_TYPE (decl));
5625 /* Finish debugging output for this type. */
5626 rest_of_type_compilation (t, toplevel);
5631 /* Lay out the type T, and its element type, and so on. */
5634 layout_array_type (t)
5637 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5638 layout_array_type (TREE_TYPE (t));
5642 /* Begin compiling the definition of an enumeration type.
5643 NAME is its name (or null if anonymous).
5644 Returns the type object, as yet incomplete.
5645 Also records info about it so that build_enumerator
5646 may be used to declare the individual values as they are read. */
5652 register tree enumtype = 0;
5654 /* If this is the real definition for a previous forward reference,
5655 fill in the contents in the same object that used to be the
5656 forward reference. */
5659 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5661 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5663 enumtype = make_node (ENUMERAL_TYPE);
5664 pushtag (name, enumtype);
5667 C_TYPE_BEING_DEFINED (enumtype) = 1;
5669 if (TYPE_VALUES (enumtype) != 0)
5671 /* This enum is a named one that has been declared already. */
5672 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5674 /* Completely replace its old definition.
5675 The old enumerators remain defined, however. */
5676 TYPE_VALUES (enumtype) = 0;
5679 enum_next_value = integer_zero_node;
5682 if (flag_short_enums)
5683 TYPE_PACKED (enumtype) = 1;
5688 /* After processing and defining all the values of an enumeration type,
5689 install their decls in the enumeration type and finish it off.
5690 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5691 and ATTRIBUTES are the specified attributes.
5692 Returns ENUMTYPE. */
5695 finish_enum (enumtype, values, attributes)
5700 register tree pair, tem;
5701 tree minnode = 0, maxnode = 0, enum_value_type;
5702 int precision, unsign;
5703 int toplevel = (global_binding_level == current_binding_level);
5705 if (in_parm_level_p ())
5706 warning ("enum defined inside parms");
5708 decl_attributes (&enumtype, attributes, 0);
5710 /* Calculate the maximum value of any enumerator in this type. */
5712 if (values == error_mark_node)
5713 minnode = maxnode = integer_zero_node;
5716 minnode = maxnode = TREE_VALUE (values);
5717 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5719 tree value = TREE_VALUE (pair);
5720 if (tree_int_cst_lt (maxnode, value))
5722 if (tree_int_cst_lt (value, minnode))
5727 /* Construct the final type of this enumeration. It is the same
5728 as one of the integral types - the narrowest one that fits, except
5729 that normally we only go as narrow as int - and signed iff any of
5730 the values are negative. */
5731 unsign = (tree_int_cst_sgn (minnode) >= 0);
5732 precision = MAX (min_precision (minnode, unsign),
5733 min_precision (maxnode, unsign));
5734 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5736 tree narrowest = type_for_size (precision, unsign);
5739 warning ("enumeration values exceed range of largest integer");
5740 narrowest = long_long_integer_type_node;
5743 precision = TYPE_PRECISION (narrowest);
5746 precision = TYPE_PRECISION (integer_type_node);
5748 if (precision == TYPE_PRECISION (integer_type_node))
5749 enum_value_type = type_for_size (precision, 0);
5751 enum_value_type = enumtype;
5753 TYPE_MIN_VALUE (enumtype) = minnode;
5754 TYPE_MAX_VALUE (enumtype) = maxnode;
5755 TYPE_PRECISION (enumtype) = precision;
5756 TREE_UNSIGNED (enumtype) = unsign;
5757 TYPE_SIZE (enumtype) = 0;
5758 layout_type (enumtype);
5760 if (values != error_mark_node)
5762 /* Change the type of the enumerators to be the enum type. We
5763 need to do this irrespective of the size of the enum, for
5764 proper type checking. Replace the DECL_INITIALs of the
5765 enumerators, and the value slots of the list, with copies
5766 that have the enum type; they cannot be modified in place
5767 because they may be shared (e.g. integer_zero_node) Finally,
5768 change the purpose slots to point to the names of the decls. */
5769 for (pair = values; pair; pair = TREE_CHAIN (pair))
5771 tree enu = TREE_PURPOSE (pair);
5773 TREE_TYPE (enu) = enumtype;
5774 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5775 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5776 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5777 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5778 DECL_MODE (enu) = TYPE_MODE (enumtype);
5780 /* The ISO C Standard mandates enumerators to have type int,
5781 even though the underlying type of an enum type is
5782 unspecified. Here we convert any enumerators that fit in
5783 an int to type int, to avoid promotions to unsigned types
5784 when comparing integers with enumerators that fit in the
5785 int range. When -pedantic is given, build_enumerator()
5786 would have already taken care of those that don't fit. */
5787 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5788 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5790 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5792 TREE_PURPOSE (pair) = DECL_NAME (enu);
5793 TREE_VALUE (pair) = DECL_INITIAL (enu);
5796 TYPE_VALUES (enumtype) = values;
5799 /* Fix up all variant types of this enum type. */
5800 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5802 if (tem == enumtype)
5804 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5805 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5806 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5807 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5808 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5809 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5810 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5811 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5812 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5813 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5816 /* Finish debugging output for this type. */
5817 rest_of_type_compilation (enumtype, toplevel);
5822 /* Build and install a CONST_DECL for one value of the
5823 current enumeration type (one that was begun with start_enum).
5824 Return a tree-list containing the CONST_DECL and its value.
5825 Assignment of sequential values by default is handled here. */
5828 build_enumerator (name, value)
5831 register tree decl, type;
5833 /* Validate and default VALUE. */
5835 /* Remove no-op casts from the value. */
5837 STRIP_TYPE_NOPS (value);
5841 if (TREE_CODE (value) == INTEGER_CST)
5843 value = default_conversion (value);
5844 constant_expression_warning (value);
5848 error ("enumerator value for `%s' not integer constant",
5849 IDENTIFIER_POINTER (name));
5854 /* Default based on previous value. */
5855 /* It should no longer be possible to have NON_LVALUE_EXPR
5859 value = enum_next_value;
5861 error ("overflow in enumeration values");
5864 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5866 pedwarn ("ISO C restricts enumerator values to range of `int'");
5867 value = convert (integer_type_node, value);
5870 /* Set basis for default for next value. */
5871 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5872 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5874 /* Now create a declaration for the enum value name. */
5876 type = TREE_TYPE (value);
5877 type = type_for_size (MAX (TYPE_PRECISION (type),
5878 TYPE_PRECISION (integer_type_node)),
5880 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5881 && TREE_UNSIGNED (type)));
5883 decl = build_decl (CONST_DECL, name, type);
5884 DECL_INITIAL (decl) = convert (type, value);
5887 return tree_cons (decl, value, NULL_TREE);
5891 /* Create the FUNCTION_DECL for a function definition.
5892 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5893 the declaration; they describe the function's name and the type it returns,
5894 but twisted together in a fashion that parallels the syntax of C.
5896 This function creates a binding context for the function body
5897 as well as setting up the FUNCTION_DECL in current_function_decl.
5899 Returns 1 on success. If the DECLARATOR is not suitable for a function
5900 (it defines a datum instead), we return 0, which tells
5901 yyparse to report a parse error. */
5904 start_function (declspecs, declarator, attributes)
5905 tree declarator, declspecs, attributes;
5907 tree decl1, old_decl;
5909 int old_immediate_size_expand = immediate_size_expand;
5911 current_function_returns_value = 0; /* Assume, until we see it does. */
5912 current_function_returns_null = 0;
5913 warn_about_return_type = 0;
5914 current_extern_inline = 0;
5915 c_function_varargs = 0;
5917 shadowed_labels = 0;
5919 /* Don't expand any sizes in the return type of the function. */
5920 immediate_size_expand = 0;
5922 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5924 /* If the declarator is not suitable for a function definition,
5925 cause a syntax error. */
5928 immediate_size_expand = old_immediate_size_expand;
5932 decl_attributes (&decl1, attributes, 0);
5934 announce_function (decl1);
5936 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5938 error ("return type is an incomplete type");
5939 /* Make it return void instead. */
5941 = build_function_type (void_type_node,
5942 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5945 if (warn_about_return_type)
5946 pedwarn_c99 ("return type defaults to `int'");
5948 /* Save the parm names or decls from this function's declarator
5949 where store_parm_decls will find them. */
5950 current_function_parms = last_function_parms;
5951 current_function_parm_tags = last_function_parm_tags;
5953 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5954 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5955 DECL_INITIAL (decl1) = error_mark_node;
5957 /* If this definition isn't a prototype and we had a prototype declaration
5958 before, copy the arg type info from that prototype.
5959 But not if what we had before was a builtin function. */
5960 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5961 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5962 && !DECL_BUILT_IN (old_decl)
5963 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5964 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5965 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5967 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5968 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5969 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5972 /* If there is no explicit declaration, look for any out-of-scope implicit
5975 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5977 /* Optionally warn of old-fashioned def with no previous prototype. */
5978 if (warn_strict_prototypes
5979 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5981 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5982 || (DECL_BUILT_IN (old_decl)
5983 && ! C_DECL_ANTICIPATED (old_decl)))))
5984 warning ("function declaration isn't a prototype");
5985 /* Optionally warn of any global def with no previous prototype. */
5986 else if (warn_missing_prototypes
5987 && TREE_PUBLIC (decl1)
5989 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5990 || (DECL_BUILT_IN (old_decl)
5991 && ! C_DECL_ANTICIPATED (old_decl))))
5992 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5993 warning_with_decl (decl1, "no previous prototype for `%s'");
5994 /* Optionally warn of any def with no previous prototype
5995 if the function has already been used. */
5996 else if (warn_missing_prototypes
5997 && old_decl != 0 && TREE_USED (old_decl)
5998 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5999 warning_with_decl (decl1,
6000 "`%s' was used with no prototype before its definition");
6001 /* Optionally warn of any global def with no previous declaration. */
6002 else if (warn_missing_declarations
6003 && TREE_PUBLIC (decl1)
6005 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6006 warning_with_decl (decl1, "no previous declaration for `%s'");
6007 /* Optionally warn of any def with no previous declaration
6008 if the function has already been used. */
6009 else if (warn_missing_declarations
6010 && old_decl != 0 && TREE_USED (old_decl)
6011 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6012 warning_with_decl (decl1,
6013 "`%s' was used with no declaration before its definition");
6015 /* This is a definition, not a reference.
6016 So normally clear DECL_EXTERNAL.
6017 However, `extern inline' acts like a declaration
6018 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6019 DECL_EXTERNAL (decl1) = current_extern_inline;
6021 /* This function exists in static storage.
6022 (This does not mean `static' in the C sense!) */
6023 TREE_STATIC (decl1) = 1;
6025 /* A nested function is not global. */
6026 if (current_function_decl != 0)
6027 TREE_PUBLIC (decl1) = 0;
6029 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6030 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6035 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6036 != integer_type_node)
6037 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6039 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6040 args = TREE_CHAIN (args))
6042 tree type = args ? TREE_VALUE (args) : 0;
6044 if (type == void_type_node)
6051 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6052 pedwarn_with_decl (decl1,
6053 "first argument of `%s' should be `int'");
6057 if (TREE_CODE (type) != POINTER_TYPE
6058 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6059 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6061 pedwarn_with_decl (decl1,
6062 "second argument of `%s' should be `char **'");
6066 if (TREE_CODE (type) != POINTER_TYPE
6067 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6068 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6070 pedwarn_with_decl (decl1,
6071 "third argument of `%s' should probably be `char **'");
6076 /* It is intentional that this message does not mention the third
6077 argument because it's only mentioned in an appendix of the
6079 if (argct > 0 && (argct < 2 || argct > 3))
6080 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6082 if (! TREE_PUBLIC (decl1))
6083 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6086 /* Record the decl so that the function name is defined.
6087 If we already have a decl for this name, and it is a FUNCTION_DECL,
6088 use the old decl. */
6090 current_function_decl = pushdecl (decl1);
6093 declare_parm_level (1);
6094 current_binding_level->subblocks_tag_transparent = 1;
6096 make_decl_rtl (current_function_decl, NULL);
6098 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6099 /* Promote the value to int before returning it. */
6100 if (c_promoting_integer_type_p (restype))
6102 /* It retains unsignedness if traditional
6103 or if not really getting wider. */
6104 if (TREE_UNSIGNED (restype)
6105 && (flag_traditional
6106 || (TYPE_PRECISION (restype)
6107 == TYPE_PRECISION (integer_type_node))))
6108 restype = unsigned_type_node;
6110 restype = integer_type_node;
6112 DECL_RESULT (current_function_decl)
6113 = build_decl (RESULT_DECL, NULL_TREE, restype);
6115 /* If this fcn was already referenced via a block-scope `extern' decl
6116 (or an implicit decl), propagate certain information about the usage. */
6117 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6118 TREE_ADDRESSABLE (current_function_decl) = 1;
6120 immediate_size_expand = old_immediate_size_expand;
6122 start_fname_decls ();
6127 /* Record that this function is going to be a varargs function.
6128 This is called before store_parm_decls, which is too early
6129 to call mark_varargs directly. */
6134 c_function_varargs = 1;
6137 /* Store the parameter declarations into the current function declaration.
6138 This is called after parsing the parameter declarations, before
6139 digesting the body of the function.
6141 For an old-style definition, modify the function's type
6142 to specify at least the number of arguments. */
6147 register tree fndecl = current_function_decl;
6150 /* This is either a chain of PARM_DECLs (if a prototype was used)
6151 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6152 tree specparms = current_function_parms;
6154 /* This is a list of types declared among parms in a prototype. */
6155 tree parmtags = current_function_parm_tags;
6157 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6158 register tree parmdecls = getdecls ();
6160 /* This is a chain of any other decls that came in among the parm
6161 declarations. If a parm is declared with enum {foo, bar} x;
6162 then CONST_DECLs for foo and bar are put here. */
6165 /* Nonzero if this definition is written with a prototype. */
6168 /* The function containing FNDECL, if any. */
6169 tree context = decl_function_context (fndecl);
6171 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6173 /* This case is when the function was defined with an ANSI prototype.
6174 The parms already have decls, so we need not do anything here
6175 except record them as in effect
6176 and complain if any redundant old-style parm decls were written. */
6187 error_with_decl (fndecl,
6188 "parm types given both in parmlist and separately");
6189 /* Get rid of the erroneous decls; don't keep them on
6190 the list of parms, since they might not be PARM_DECLs. */
6191 for (decl = current_binding_level->names;
6192 decl; decl = TREE_CHAIN (decl))
6193 if (DECL_NAME (decl))
6194 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6195 for (link = current_binding_level->shadowed;
6196 link; link = TREE_CHAIN (link))
6197 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6198 current_binding_level->names = 0;
6199 current_binding_level->shadowed = 0;
6202 specparms = nreverse (specparms);
6203 for (parm = specparms; parm; parm = next)
6205 next = TREE_CHAIN (parm);
6206 if (TREE_CODE (parm) == PARM_DECL)
6208 if (DECL_NAME (parm) == 0)
6209 error_with_decl (parm, "parameter name omitted");
6210 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6211 && VOID_TYPE_P (TREE_TYPE (parm)))
6213 error_with_decl (parm, "parameter `%s' declared void");
6214 /* Change the type to error_mark_node so this parameter
6215 will be ignored by assign_parms. */
6216 TREE_TYPE (parm) = error_mark_node;
6222 /* If we find an enum constant or a type tag,
6223 put it aside for the moment. */
6224 TREE_CHAIN (parm) = 0;
6225 others = chainon (others, parm);
6229 /* Get the decls in their original chain order
6230 and record in the function. */
6231 DECL_ARGUMENTS (fndecl) = getdecls ();
6234 /* If this function takes a variable number of arguments,
6235 add a phony parameter to the end of the parm list,
6236 to represent the position of the first unnamed argument. */
6237 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6240 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6241 /* Let's hope the address of the unnamed parm
6242 won't depend on its type. */
6243 TREE_TYPE (dummy) = integer_type_node;
6244 DECL_ARG_TYPE (dummy) = integer_type_node;
6245 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6249 /* Now pushdecl the enum constants. */
6250 for (parm = others; parm; parm = next)
6252 next = TREE_CHAIN (parm);
6253 if (DECL_NAME (parm) == 0)
6255 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6257 else if (TREE_CODE (parm) != PARM_DECL)
6261 storetags (chainon (parmtags, gettags ()));
6265 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6266 each with a parm name as the TREE_VALUE.
6268 PARMDECLS is a chain of declarations for parameters.
6269 Warning! It can also contain CONST_DECLs which are not parameters
6270 but are names of enumerators of any enum types
6271 declared among the parameters.
6273 First match each formal parameter name with its declaration.
6274 Associate decls with the names and store the decls
6275 into the TREE_PURPOSE slots. */
6277 /* We use DECL_WEAK as a flag to show which parameters have been
6278 seen already since it is not used on PARM_DECL or CONST_DECL. */
6279 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6280 DECL_WEAK (parm) = 0;
6282 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6284 register tree tail, found = NULL;
6286 if (TREE_VALUE (parm) == 0)
6288 error_with_decl (fndecl,
6289 "parameter name missing from parameter list");
6290 TREE_PURPOSE (parm) = 0;
6294 /* See if any of the parmdecls specifies this parm by name.
6295 Ignore any enumerator decls. */
6296 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6297 if (DECL_NAME (tail) == TREE_VALUE (parm)
6298 && TREE_CODE (tail) == PARM_DECL)
6304 /* If declaration already marked, we have a duplicate name.
6305 Complain, and don't use this decl twice. */
6306 if (found && DECL_WEAK (found))
6308 error_with_decl (found, "multiple parameters named `%s'");
6312 /* If the declaration says "void", complain and ignore it. */
6313 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6315 error_with_decl (found, "parameter `%s' declared void");
6316 TREE_TYPE (found) = integer_type_node;
6317 DECL_ARG_TYPE (found) = integer_type_node;
6318 layout_decl (found, 0);
6321 /* Traditionally, a parm declared float is actually a double. */
6322 if (found && flag_traditional
6323 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6325 TREE_TYPE (found) = double_type_node;
6326 DECL_ARG_TYPE (found) = double_type_node;
6327 layout_decl (found, 0);
6330 /* If no declaration found, default to int. */
6333 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6335 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6336 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6337 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6339 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6340 else if (extra_warnings)
6341 warning_with_decl (found, "type of `%s' defaults to `int'");
6345 TREE_PURPOSE (parm) = found;
6347 /* Mark this decl as "already found". */
6348 DECL_WEAK (found) = 1;
6351 /* Put anything which is on the parmdecls chain and which is
6352 not a PARM_DECL onto the list NONPARMS. (The types of
6353 non-parm things which might appear on the list include
6354 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6355 any actual PARM_DECLs not matched with any names. */
6358 for (parm = parmdecls; parm;)
6360 tree next = TREE_CHAIN (parm);
6361 TREE_CHAIN (parm) = 0;
6363 if (TREE_CODE (parm) != PARM_DECL)
6364 nonparms = chainon (nonparms, parm);
6367 /* Complain about args with incomplete types. */
6368 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6370 error_with_decl (parm, "parameter `%s' has incomplete type");
6371 TREE_TYPE (parm) = error_mark_node;
6374 if (! DECL_WEAK (parm))
6376 error_with_decl (parm,
6377 "declaration for parameter `%s' but no such parameter");
6378 /* Pretend the parameter was not missing.
6379 This gets us to a standard state and minimizes
6380 further error messages. */
6382 = chainon (specparms,
6383 tree_cons (parm, NULL_TREE, NULL_TREE));
6390 /* Chain the declarations together in the order of the list of
6391 names. Store that chain in the function decl, replacing the
6394 DECL_ARGUMENTS (fndecl) = 0;
6397 for (last = 0; parm; parm = TREE_CHAIN (parm))
6398 if (TREE_PURPOSE (parm))
6401 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6403 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6404 last = TREE_PURPOSE (parm);
6405 TREE_CHAIN (last) = 0;
6409 /* If there was a previous prototype,
6410 set the DECL_ARG_TYPE of each argument according to
6411 the type previously specified, and report any mismatches. */
6413 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6416 for (parm = DECL_ARGUMENTS (fndecl),
6417 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6418 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6419 != void_type_node));
6420 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6422 if (parm == 0 || type == 0
6423 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6425 error ("number of arguments doesn't match prototype");
6426 error_with_file_and_line (current_function_prototype_file,
6427 current_function_prototype_line,
6428 "prototype declaration");
6431 /* Type for passing arg must be consistent with that
6432 declared for the arg. ISO C says we take the unqualified
6433 type for parameters declared with qualified type. */
6434 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6435 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6437 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6438 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6440 /* Adjust argument to match prototype. E.g. a previous
6441 `int foo(float);' prototype causes
6442 `int foo(x) float x; {...}' to be treated like
6443 `int foo(float x) {...}'. This is particularly
6444 useful for argument types like uid_t. */
6445 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6447 if (PROMOTE_PROTOTYPES
6448 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6449 && TYPE_PRECISION (TREE_TYPE (parm))
6450 < TYPE_PRECISION (integer_type_node))
6451 DECL_ARG_TYPE (parm) = integer_type_node;
6455 pedwarn ("promoted argument `%s' doesn't match prototype",
6456 IDENTIFIER_POINTER (DECL_NAME (parm)));
6457 warning_with_file_and_line
6458 (current_function_prototype_file,
6459 current_function_prototype_line,
6460 "prototype declaration");
6463 /* If -traditional, allow `int' argument to match
6464 `unsigned' prototype. */
6465 else if (! (flag_traditional
6466 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6467 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6469 error ("argument `%s' doesn't match prototype",
6470 IDENTIFIER_POINTER (DECL_NAME (parm)));
6471 error_with_file_and_line (current_function_prototype_file,
6472 current_function_prototype_line,
6473 "prototype declaration");
6477 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6480 /* Otherwise, create a prototype that would match. */
6484 tree actual = 0, last = 0, type;
6486 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6488 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6490 TREE_CHAIN (last) = type;
6495 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6497 TREE_CHAIN (last) = type;
6501 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6502 of the type of this function, but we need to avoid having this
6503 affect the types of other similarly-typed functions, so we must
6504 first force the generation of an identical (but separate) type
6505 node for the relevant function type. The new node we create
6506 will be a variant of the main variant of the original function
6509 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6511 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6514 /* Now store the final chain of decls for the arguments
6515 as the decl-chain of the current lexical scope.
6516 Put the enumerators in as well, at the front so that
6517 DECL_ARGUMENTS is not modified. */
6519 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6522 /* Make sure the binding level for the top of the function body
6523 gets a BLOCK if there are any in the function.
6524 Otherwise, the dbx output is wrong. */
6526 keep_next_if_subblocks = 1;
6528 /* ??? This might be an improvement,
6529 but needs to be thought about some more. */
6531 keep_next_level_flag = 1;
6534 /* Write a record describing this function definition to the prototypes
6535 file (if requested). */
6537 gen_aux_info_record (fndecl, 1, 0, prototype);
6539 /* Initialize the RTL code for the function. */
6540 init_function_start (fndecl, input_filename, lineno);
6542 /* Begin the statement tree for this function. */
6543 DECL_LANG_SPECIFIC (current_function_decl)
6544 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6545 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6547 /* If this is a nested function, save away the sizes of any
6548 variable-size types so that we can expand them when generating
6554 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6555 = nreverse (get_pending_sizes ());
6556 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6559 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6562 /* This function is being processed in whole-function mode. */
6563 cfun->x_whole_function_mode_p = 1;
6565 /* Even though we're inside a function body, we still don't want to
6566 call expand_expr to calculate the size of a variable-sized array.
6567 We haven't necessarily assigned RTL to all variables yet, so it's
6568 not safe to try to expand expressions involving them. */
6569 immediate_size_expand = 0;
6570 cfun->x_dont_save_pending_sizes_p = 1;
6573 /* Finish up a function declaration and compile that function
6574 all the way to assembler language output. The free the storage
6575 for the function definition.
6577 This is called after parsing the body of the function definition.
6579 NESTED is nonzero if the function being finished is nested in another. */
6582 finish_function (nested)
6585 register tree fndecl = current_function_decl;
6587 /* TREE_READONLY (fndecl) = 1;
6588 This caused &foo to be of type ptr-to-const-function
6589 which then got a warning when stored in a ptr-to-function variable. */
6592 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6594 /* Must mark the RESULT_DECL as being in this function. */
6596 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6598 /* Obey `register' declarations if `setjmp' is called in this fn. */
6599 if (flag_traditional && current_function_calls_setjmp)
6601 setjmp_protect (DECL_INITIAL (fndecl));
6602 setjmp_protect_args ();
6605 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6607 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6608 != integer_type_node)
6610 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6611 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6613 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6617 #ifdef DEFAULT_MAIN_RETURN
6618 /* Make it so that `main' always returns success by default. */
6619 DEFAULT_MAIN_RETURN;
6622 c_expand_return (integer_zero_node);
6627 finish_fname_decls ();
6629 /* Tie off the statement tree for this function. */
6630 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6631 /* Clear out memory we no longer need. */
6632 free_after_parsing (cfun);
6633 /* Since we never call rest_of_compilation, we never clear
6634 CFUN. Do so explicitly. */
6635 free_after_compilation (cfun);
6640 /* Generate RTL for the body of this function. */
6641 c_expand_body (fndecl, nested);
6642 /* Let the error reporting routines know that we're outside a
6643 function. For a nested function, this value is used in
6644 pop_c_function_context and then reset via pop_function_context. */
6645 current_function_decl = NULL;
6649 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6650 then we are already in the process of generating RTL for another
6654 c_expand_body (fndecl, nested_p)
6658 /* There's no reason to do any of the work here if we're only doing
6659 semantic analysis; this code just generates RTL. */
6660 if (flag_syntax_only)
6665 /* Make sure that we will evaluate variable-sized types involved
6666 in our function's type. */
6667 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6668 /* Squirrel away our current state. */
6669 push_function_context ();
6672 /* Initialize the RTL code for the function. */
6673 current_function_decl = fndecl;
6674 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6676 /* This function is being processed in whole-function mode. */
6677 cfun->x_whole_function_mode_p = 1;
6679 /* Even though we're inside a function body, we still don't want to
6680 call expand_expr to calculate the size of a variable-sized array.
6681 We haven't necessarily assigned RTL to all variables yet, so it's
6682 not safe to try to expand expressions involving them. */
6683 immediate_size_expand = 0;
6684 cfun->x_dont_save_pending_sizes_p = 1;
6686 /* If this is a varargs function, inform function.c. */
6687 if (c_function_varargs)
6690 /* Set up parameters and prepare for return, for the function. */
6691 expand_function_start (fndecl, 0);
6693 /* If this function is `main', emit a call to `__main'
6694 to run global initializers, etc. */
6695 if (DECL_NAME (fndecl)
6696 && MAIN_NAME_P (DECL_NAME (fndecl))
6697 && DECL_CONTEXT (fndecl) == NULL_TREE)
6698 expand_main_function ();
6700 /* Generate the RTL for this function. */
6701 expand_stmt (DECL_SAVED_TREE (fndecl));
6702 /* Allow the body of the function to be garbage collected. */
6703 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6705 /* We hard-wired immediate_size_expand to zero above.
6706 expand_function_end will decrement this variable. So, we set the
6707 variable to one here, so that after the decrement it will remain
6709 immediate_size_expand = 1;
6711 /* Allow language dialects to perform special processing. */
6712 if (lang_expand_function_end)
6713 (*lang_expand_function_end) ();
6715 /* Generate rtl for function exit. */
6716 expand_function_end (input_filename, lineno, 0);
6718 /* If this is a nested function, protect the local variables in the stack
6719 above us from being collected while we're compiling this function. */
6721 ggc_push_context ();
6723 /* Run the optimizers and output the assembler code for this function. */
6724 rest_of_compilation (fndecl);
6726 /* Undo the GC context switch. */
6730 /* With just -W, complain only if function returns both with
6731 and without a value. */
6733 && current_function_returns_value
6734 && current_function_returns_null)
6735 warning ("this function may return with or without a value");
6737 /* If requested, warn about function definitions where the function will
6738 return a value (usually of some struct or union type) which itself will
6739 take up a lot of stack space. */
6741 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6743 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6745 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6746 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6747 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6750 unsigned int size_as_int
6751 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6753 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6754 warning_with_decl (fndecl,
6755 "size of return value of `%s' is %u bytes",
6758 warning_with_decl (fndecl,
6759 "size of return value of `%s' is larger than %d bytes",
6764 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6766 /* Stop pointing to the local nodes about to be freed.
6767 But DECL_INITIAL must remain nonzero so we know this
6768 was an actual function definition.
6769 For a nested function, this is done in pop_c_function_context.
6770 If rest_of_compilation set this to 0, leave it 0. */
6771 if (DECL_INITIAL (fndecl) != 0)
6772 DECL_INITIAL (fndecl) = error_mark_node;
6774 DECL_ARGUMENTS (fndecl) = 0;
6777 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6779 #ifndef ASM_OUTPUT_CONSTRUCTOR
6780 if (! flag_gnu_linker)
6781 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6784 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6787 if (DECL_STATIC_DESTRUCTOR (fndecl))
6789 #ifndef ASM_OUTPUT_DESTRUCTOR
6790 if (! flag_gnu_linker)
6791 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6794 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6798 /* Return to the enclosing function. */
6799 pop_function_context ();
6802 /* Check the declarations given in a for-loop for satisfying the C99
6805 check_for_loop_decls ()
6811 /* If we get here, declarations have been used in a for loop without
6812 the C99 for loop scope. This doesn't make much sense, so don't
6814 error ("`for' loop initial declaration used outside C99 mode");
6817 /* C99 subclause 6.8.5 paragraph 3:
6819 [#3] The declaration part of a for statement shall only
6820 declare identifiers for objects having storage class auto or
6823 It isn't clear whether, in this sentence, "identifiers" binds to
6824 "shall only declare" or to "objects" - that is, whether all identifiers
6825 declared must be identifiers for objects, or whether the restriction
6826 only applies to those that are. (A question on this in comp.std.c
6827 in November 2000 received no answer.) We implement the strictest
6828 interpretation, to avoid creating an extension which later causes
6831 for (t = gettags (); t; t = TREE_CHAIN (t))
6833 if (TREE_PURPOSE (t) != 0)
6834 error ("`%s %s' declared in `for' loop initial declaration",
6835 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6836 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6838 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6840 for (t = getdecls (); t; t = TREE_CHAIN (t))
6842 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6843 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6844 else if (TREE_STATIC (t))
6845 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6846 else if (DECL_EXTERNAL (t))
6847 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6851 /* Save and restore the variables in this file and elsewhere
6852 that keep track of the progress of compilation of the current function.
6853 Used for nested functions. */
6855 struct c_language_function
6857 struct language_function base;
6859 tree shadowed_labels;
6862 int warn_about_return_type;
6864 struct binding_level *binding_level;
6867 /* Save and reinitialize the variables
6868 used during compilation of a C function. */
6871 push_c_function_context (f)
6874 struct c_language_function *p;
6875 p = ((struct c_language_function *)
6876 xmalloc (sizeof (struct c_language_function)));
6877 f->language = (struct language_function *) p;
6879 p->base.x_stmt_tree = c_stmt_tree;
6880 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6881 p->named_labels = named_labels;
6882 p->shadowed_labels = shadowed_labels;
6883 p->returns_value = current_function_returns_value;
6884 p->returns_null = current_function_returns_null;
6885 p->warn_about_return_type = warn_about_return_type;
6886 p->extern_inline = current_extern_inline;
6887 p->binding_level = current_binding_level;
6890 /* Restore the variables used during compilation of a C function. */
6893 pop_c_function_context (f)
6896 struct c_language_function *p
6897 = (struct c_language_function *) f->language;
6900 /* Bring back all the labels that were shadowed. */
6901 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6902 if (DECL_NAME (TREE_VALUE (link)) != 0)
6903 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6904 = TREE_VALUE (link);
6906 if (DECL_SAVED_INSNS (current_function_decl) == 0
6907 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6909 /* Stop pointing to the local nodes about to be freed. */
6910 /* But DECL_INITIAL must remain nonzero so we know this
6911 was an actual function definition. */
6912 DECL_INITIAL (current_function_decl) = error_mark_node;
6913 DECL_ARGUMENTS (current_function_decl) = 0;
6916 c_stmt_tree = p->base.x_stmt_tree;
6917 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6918 named_labels = p->named_labels;
6919 shadowed_labels = p->shadowed_labels;
6920 current_function_returns_value = p->returns_value;
6921 current_function_returns_null = p->returns_null;
6922 warn_about_return_type = p->warn_about_return_type;
6923 current_extern_inline = p->extern_inline;
6924 current_binding_level = p->binding_level;
6930 /* Mark the language specific parts of F for GC. */
6933 mark_c_function_context (f)
6936 struct c_language_function *p
6937 = (struct c_language_function *) f->language;
6942 mark_c_language_function (&p->base);
6943 ggc_mark_tree (p->shadowed_labels);
6944 ggc_mark_tree (p->named_labels);
6945 mark_binding_level (&p->binding_level);
6948 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6951 copy_lang_decl (decl)
6954 struct lang_decl *ld;
6956 if (!DECL_LANG_SPECIFIC (decl))
6959 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6960 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6961 sizeof (struct lang_decl));
6962 DECL_LANG_SPECIFIC (decl) = ld;
6965 /* Mark the language specific bits in T for GC. */
6971 if (TREE_CODE (t) == IDENTIFIER_NODE)
6973 struct lang_identifier *i = (struct lang_identifier *) t;
6974 ggc_mark_tree (i->global_value);
6975 ggc_mark_tree (i->local_value);
6976 ggc_mark_tree (i->label_value);
6977 ggc_mark_tree (i->implicit_decl);
6978 ggc_mark_tree (i->error_locus);
6979 ggc_mark_tree (i->limbo_value);
6981 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6982 ggc_mark (TYPE_LANG_SPECIFIC (t));
6983 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
6985 ggc_mark (DECL_LANG_SPECIFIC (t));
6986 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
6987 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
6991 /* The functions below are required for functionality of doing
6992 function at once processing in the C front end. Currently these
6993 functions are not called from anywhere in the C front end, but as
6994 these changes continue, that will change. */
6996 /* Returns non-zero if the current statement is a full expression,
6997 i.e. temporaries created during that statement should be destroyed
6998 at the end of the statement. */
7001 stmts_are_full_exprs_p ()
7006 /* Returns the stmt_tree (if any) to which statements are currently
7007 being added. If there is no active statement-tree, NULL is
7011 current_stmt_tree ()
7013 return &c_stmt_tree;
7016 /* Returns the stack of SCOPE_STMTs for the current function. */
7019 current_scope_stmt_stack ()
7021 return &c_scope_stmt_stack;
7024 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7028 anon_aggr_type_p (node)
7029 tree node ATTRIBUTE_UNUSED;
7034 /* Dummy function in place of callback used by C++. */
7037 extract_interface_info ()
7041 /* Return a new COMPOUND_STMT, after adding it to the current
7045 c_begin_compound_stmt ()
7049 /* Create the COMPOUND_STMT. */
7050 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7055 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7059 c_expand_decl_stmt (t)
7062 tree decl = DECL_STMT_DECL (t);
7064 /* Expand nested functions. */
7065 if (TREE_CODE (decl) == FUNCTION_DECL
7066 && DECL_CONTEXT (decl) == current_function_decl
7067 && DECL_SAVED_TREE (decl))
7068 c_expand_body (decl, /*nested_p=*/1);
7071 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7072 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7075 identifier_global_value (t)
7078 return IDENTIFIER_GLOBAL_VALUE (t);
7081 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7082 otherwise the name is found in ridpointers from RID_INDEX. */
7085 record_builtin_type (rid_index, name, type)
7092 id = ridpointers[(int) rid_index];
7094 id = get_identifier (name);
7095 pushdecl (build_decl (TYPE_DECL, id, type));
7098 /* Build the void_list_node (void_type_node having been created). */
7100 build_void_list_node ()
7102 tree t = build_tree_list (NULL_TREE, void_type_node);