1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
49 { NORMAL, /* Ordinary declaration */
50 FUNCDEF, /* Function definition */
51 PARM, /* Declaration of parm before function body */
52 FIELD, /* Declaration inside struct or union */
53 BITFIELD, /* Likewise but with specified width */
54 TYPENAME}; /* Typename (inside cast or sizeof) */
57 /* Nonzero if we have seen an invalid cross reference
58 to a struct, union, or enum, but not yet printed the message. */
60 tree pending_invalid_xref;
61 /* File and line to appear in the eventual error message. */
62 const char *pending_invalid_xref_file;
63 int pending_invalid_xref_line;
65 /* While defining an enum type, this is 1 plus the last enumerator
66 constant value. Note that will do not have to save this or `enum_overflow'
67 around nested function definition since such a definition could only
68 occur in an enum value expression and we don't use these variables in
71 static tree enum_next_value;
73 /* Nonzero means that there was overflow computing enum_next_value. */
75 static int enum_overflow;
77 /* Parsing a function declarator leaves a list of parameter names
78 or a chain or parameter decls here. */
80 static tree last_function_parms;
82 /* Parsing a function declarator leaves here a chain of structure
83 and enum types declared in the parmlist. */
85 static tree last_function_parm_tags;
87 /* After parsing the declarator that starts a function definition,
88 `start_function' puts here the list of parameter names or chain of decls.
89 `store_parm_decls' finds it here. */
91 static tree current_function_parms;
93 /* Similar, for last_function_parm_tags. */
94 static tree current_function_parm_tags;
96 /* Similar, for the file and line that the prototype came from if this is
97 an old-style definition. */
98 static const char *current_function_prototype_file;
99 static int current_function_prototype_line;
101 /* The current statement tree. */
103 static struct stmt_tree_s c_stmt_tree;
105 /* The current scope statement stack. */
107 static tree c_scope_stmt_stack;
109 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
110 that have names. Here so we can clear out their names' definitions
111 at the end of the function. */
113 static tree named_labels;
115 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
117 static tree shadowed_labels;
119 /* Nonzero when store_parm_decls is called indicates a varargs function.
120 Value not meaningful after store_parm_decls. */
122 static int c_function_varargs;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to nonzero by `grokdeclarator' for a function
135 whose return type is defaulted, if warnings for this are desired. */
137 static int warn_about_return_type;
139 /* Nonzero when starting a function declared `extern inline'. */
141 static int current_extern_inline;
143 /* For each binding contour we allocate a binding_level structure
144 * which records the names defined in that contour.
147 * 1) one for each function definition,
148 * where internal declarations of the parameters appear.
149 * 2) one for each compound statement,
150 * to record its declarations.
152 * The current meaning of a name can be found by searching the levels from
153 * the current one out to the global one.
156 /* Note that the information in the `names' component of the global contour
157 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
161 /* A chain of _DECL nodes for all variables, constants, functions,
162 and typedef types. These are in the reverse of the order supplied.
166 /* A list of structure, union and enum definitions,
167 * for looking up tag names.
168 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
169 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
170 * or ENUMERAL_TYPE node.
174 /* For each level, a list of shadowed outer-level local definitions
175 to be restored when this level is popped.
176 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
177 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
180 /* For each level (except not the global one),
181 a chain of BLOCK nodes for all the levels
182 that were entered and exited one level down. */
185 /* The BLOCK node for this level, if one has been preallocated.
186 If 0, the BLOCK is allocated (if needed) when the level is popped. */
189 /* The binding level which this one is contained in (inherits from). */
190 struct binding_level *level_chain;
192 /* Nonzero for the level that holds the parameters of a function. */
195 /* Nonzero if this level "doesn't exist" for tags. */
196 char tag_transparent;
198 /* Nonzero if sublevels of this level "don't exist" for tags.
199 This is set in the parm level of a function definition
200 while reading the function body, so that the outermost block
201 of the function body will be tag-transparent. */
202 char subblocks_tag_transparent;
204 /* Nonzero means make a BLOCK for this level regardless of all else. */
207 /* Nonzero means make a BLOCK if this level has any subblocks. */
208 char keep_if_subblocks;
210 /* Number of decls in `names' that have incomplete
211 structure or union types. */
214 /* A list of decls giving the (reversed) specified order of parms,
215 not including any forward-decls in the parmlist.
216 This is so we can put the parms in proper order for assign_parms. */
220 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
222 /* The binding level currently in effect. */
224 static struct binding_level *current_binding_level;
226 /* A chain of binding_level structures awaiting reuse. */
228 static struct binding_level *free_binding_level;
230 /* The outermost binding level, for names of file scope.
231 This is created when the compiler is started and exists
232 through the entire run. */
234 static struct binding_level *global_binding_level;
236 /* Binding level structures are initialized by copying this one. */
238 static struct binding_level clear_binding_level
239 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
242 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
244 static int keep_next_level_flag;
246 /* Nonzero means make a BLOCK for the next level pushed
247 if it has subblocks. */
249 static int keep_next_if_subblocks;
251 /* The chain of outer levels of label scopes.
252 This uses the same data structure used for binding levels,
253 but it works differently: each link in the chain records
254 saved values of named_labels and shadowed_labels for
255 a label binding level outside the current one. */
257 static struct binding_level *label_level_chain;
259 /* Functions called automatically at the beginning and end of execution. */
261 tree static_ctors, static_dtors;
263 /* Forward declarations. */
265 static struct binding_level * make_binding_level PARAMS ((void));
266 static void mark_binding_level PARAMS ((void *));
267 static void clear_limbo_values PARAMS ((tree));
268 static int duplicate_decls PARAMS ((tree, tree, int));
269 static int redeclaration_error_message PARAMS ((tree, tree));
270 static void storedecls PARAMS ((tree));
271 static void storetags PARAMS ((tree));
272 static tree lookup_tag PARAMS ((enum tree_code, tree,
273 struct binding_level *, int));
274 static tree lookup_tag_reverse PARAMS ((tree));
275 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
277 static tree grokparms PARAMS ((tree, int));
278 static void layout_array_type PARAMS ((tree));
279 static tree c_make_fname_decl PARAMS ((tree, int));
280 static void c_expand_body PARAMS ((tree, int));
282 /* C-specific option variables. */
284 /* Nonzero means allow type mismatches in conditional expressions;
285 just make their values `void'. */
287 int flag_cond_mismatch;
289 /* Nonzero means don't recognize the keyword `asm'. */
293 /* Nonzero means do some things the same way PCC does. */
295 int flag_traditional;
297 /* Nonzero means enable C89 Amendment 1 features. */
301 /* Nonzero means use the ISO C99 dialect of C. */
305 /* Nonzero means that we have builtin functions, and main is an int */
309 /* Nonzero means add default format_arg attributes for functions not
312 int flag_noniso_default_format_attributes = 1;
314 /* Nonzero means to allow single precision math even if we're generally
315 being traditional. */
316 int flag_allow_single_precision = 0;
318 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
320 int flag_signed_bitfields = 1;
321 int explicit_flag_signed_bitfields = 0;
323 /* Nonzero means warn about use of implicit int. */
325 int warn_implicit_int;
327 /* Nonzero means warn about usage of long long when `-pedantic'. */
329 int warn_long_long = 1;
331 /* Nonzero means message about use of implicit function declarations;
332 1 means warning; 2 means error. */
334 int mesg_implicit_function_declaration = -1;
336 /* Nonzero means give string constants the type `const char *'
337 to get extra warnings from them. These warnings will be too numerous
338 to be useful, except in thoroughly ANSIfied programs. */
340 int flag_const_strings;
342 /* Nonzero means warn about pointer casts that can drop a type qualifier
343 from the pointer target type. */
347 /* Nonzero means warn when casting a function call to a type that does
348 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
349 when there is no previous declaration of sqrt or malloc. */
351 int warn_bad_function_cast;
353 /* Warn about functions which might be candidates for format attributes. */
355 int warn_missing_format_attribute;
357 /* Warn about traditional constructs whose meanings changed in ANSI C. */
359 int warn_traditional;
361 /* Nonzero means warn about sizeof(function) or addition/subtraction
362 of function pointers. */
364 int warn_pointer_arith;
366 /* Nonzero means warn for non-prototype function decls
367 or non-prototyped defs without previous prototype. */
369 int warn_strict_prototypes;
371 /* Nonzero means warn for any global function def
372 without separate previous prototype decl. */
374 int warn_missing_prototypes;
376 /* Nonzero means warn for any global function def
377 without separate previous decl. */
379 int warn_missing_declarations;
381 /* Nonzero means warn about multiple (redundant) decls for the same single
382 variable or function. */
384 int warn_redundant_decls = 0;
386 /* Nonzero means warn about extern declarations of objects not at
387 file-scope level and about *all* declarations of functions (whether
388 extern or static) not at file-scope level. Note that we exclude
389 implicit function declarations. To get warnings about those, use
392 int warn_nested_externs = 0;
394 /* Warn about a subscript that has type char. */
396 int warn_char_subscripts = 0;
398 /* Warn if a type conversion is done that might have confusing results. */
402 /* Warn if adding () is suggested. */
404 int warn_parentheses;
406 /* Warn if initializer is not completely bracketed. */
408 int warn_missing_braces;
410 /* Warn if main is suspicious. */
414 /* Warn about #pragma directives that are not recognised. */
416 int warn_unknown_pragmas = 0; /* Tri state variable. */
418 /* Warn about comparison of signed and unsigned values.
419 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
421 int warn_sign_compare = -1;
423 /* Warn about testing equality of floating point numbers. */
425 int warn_float_equal = 0;
427 /* Nonzero means warn about use of multicharacter literals. */
429 int warn_multichar = 1;
431 /* The variant of the C language being processed. */
433 c_language_kind c_language = clk_c;
435 /* Nonzero means `$' can be in an identifier. */
437 #ifndef DOLLARS_IN_IDENTIFIERS
438 #define DOLLARS_IN_IDENTIFIERS 1
440 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
442 /* Decode the string P as a language-specific option for C.
443 Return the number of strings consumed. Should not complain
444 if it does not recognise the option. */
447 c_decode_option (argc, argv)
448 int argc ATTRIBUTE_UNUSED;
451 int strings_processed;
454 strings_processed = cpp_handle_option (parse_in, argc, argv);
456 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
458 flag_traditional = 1;
459 flag_writable_strings = 1;
461 else if (!strcmp (p, "-fallow-single-precision"))
462 flag_allow_single_precision = 1;
463 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
468 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
472 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
476 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
478 flag_traditional = 0;
479 flag_writable_strings = 0;
481 else if (!strncmp (p, "-std=", 5))
483 /* Select the appropriate language standard. We currently
485 -std=iso9899:1990 same as -ansi
486 -std=iso9899:199409 ISO C as modified in amend. 1
487 -std=iso9899:1999 ISO C 99
488 -std=c89 same as -std=iso9899:1990
489 -std=c99 same as -std=iso9899:1999
490 -std=gnu89 default, iso9899:1990 + gnu extensions
491 -std=gnu99 iso9899:1999 + gnu extensions
493 const char *const argstart = &p[5];
495 if (!strcmp (argstart, "iso9899:1990")
496 || !strcmp (argstart, "c89"))
501 flag_traditional = 0;
502 flag_writable_strings = 0;
504 flag_no_nonansi_builtin = 1;
505 flag_noniso_default_format_attributes = 0;
508 else if (!strcmp (argstart, "iso9899:199409"))
513 else if (!strcmp (argstart, "iso9899:199x")
514 || !strcmp (argstart, "iso9899:1999")
515 || !strcmp (argstart, "c9x")
516 || !strcmp (argstart, "c99"))
518 flag_traditional = 0;
519 flag_writable_strings = 0;
521 flag_no_nonansi_builtin = 1;
522 flag_noniso_default_format_attributes = 0;
526 else if (!strcmp (argstart, "gnu89"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
531 flag_no_nonansi_builtin = 0;
532 flag_noniso_default_format_attributes = 1;
536 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
538 flag_traditional = 0;
539 flag_writable_strings = 0;
541 flag_no_nonansi_builtin = 0;
542 flag_noniso_default_format_attributes = 1;
547 error ("unknown C standard `%s'", argstart);
549 else if (!strcmp (p, "-fdollars-in-identifiers"))
550 dollars_in_ident = 1;
551 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
552 dollars_in_ident = 0;
553 else if (!strcmp (p, "-fsigned-char"))
554 flag_signed_char = 1;
555 else if (!strcmp (p, "-funsigned-char"))
556 flag_signed_char = 0;
557 else if (!strcmp (p, "-fno-signed-char"))
558 flag_signed_char = 0;
559 else if (!strcmp (p, "-fno-unsigned-char"))
560 flag_signed_char = 1;
561 else if (!strcmp (p, "-fsigned-bitfields")
562 || !strcmp (p, "-fno-unsigned-bitfields"))
564 flag_signed_bitfields = 1;
565 explicit_flag_signed_bitfields = 1;
567 else if (!strcmp (p, "-funsigned-bitfields")
568 || !strcmp (p, "-fno-signed-bitfields"))
570 flag_signed_bitfields = 0;
571 explicit_flag_signed_bitfields = 1;
573 else if (!strcmp (p, "-fshort-enums"))
574 flag_short_enums = 1;
575 else if (!strcmp (p, "-fno-short-enums"))
576 flag_short_enums = 0;
577 else if (!strcmp (p, "-fshort-wchar"))
578 flag_short_wchar = 1;
579 else if (!strcmp (p, "-fno-short-wchar"))
580 flag_short_wchar = 0;
581 else if (!strcmp (p, "-fcond-mismatch"))
582 flag_cond_mismatch = 1;
583 else if (!strcmp (p, "-fno-cond-mismatch"))
584 flag_cond_mismatch = 0;
585 else if (!strcmp (p, "-fshort-double"))
586 flag_short_double = 1;
587 else if (!strcmp (p, "-fno-short-double"))
588 flag_short_double = 0;
589 else if (!strcmp (p, "-fasm"))
591 else if (!strcmp (p, "-fno-asm"))
593 else if (!strcmp (p, "-fbuiltin"))
595 else if (!strcmp (p, "-fno-builtin"))
597 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
599 else if (!strcmp (p, "-ansi"))
601 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
602 mesg_implicit_function_declaration = 2;
603 else if (!strcmp (p, "-Wimplicit-function-declaration"))
604 mesg_implicit_function_declaration = 1;
605 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
606 mesg_implicit_function_declaration = 0;
607 else if (!strcmp (p, "-Wimplicit-int"))
608 warn_implicit_int = 1;
609 else if (!strcmp (p, "-Wno-implicit-int"))
610 warn_implicit_int = 0;
611 else if (!strcmp (p, "-Wimplicit"))
613 warn_implicit_int = 1;
614 if (mesg_implicit_function_declaration != 2)
615 mesg_implicit_function_declaration = 1;
617 else if (!strcmp (p, "-Wno-implicit"))
618 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
619 else if (!strcmp (p, "-Wlong-long"))
621 else if (!strcmp (p, "-Wno-long-long"))
623 else if (!strcmp (p, "-Wwrite-strings"))
624 flag_const_strings = 1;
625 else if (!strcmp (p, "-Wno-write-strings"))
626 flag_const_strings = 0;
627 else if (!strcmp (p, "-Wcast-qual"))
629 else if (!strcmp (p, "-Wno-cast-qual"))
631 else if (!strcmp (p, "-Wbad-function-cast"))
632 warn_bad_function_cast = 1;
633 else if (!strcmp (p, "-Wno-bad-function-cast"))
634 warn_bad_function_cast = 0;
635 else if (!strcmp (p, "-Wno-missing-noreturn"))
636 warn_missing_noreturn = 0;
637 else if (!strcmp (p, "-Wmissing-format-attribute"))
638 warn_missing_format_attribute = 1;
639 else if (!strcmp (p, "-Wno-missing-format-attribute"))
640 warn_missing_format_attribute = 0;
641 else if (!strcmp (p, "-Wpointer-arith"))
642 warn_pointer_arith = 1;
643 else if (!strcmp (p, "-Wno-pointer-arith"))
644 warn_pointer_arith = 0;
645 else if (!strcmp (p, "-Wstrict-prototypes"))
646 warn_strict_prototypes = 1;
647 else if (!strcmp (p, "-Wno-strict-prototypes"))
648 warn_strict_prototypes = 0;
649 else if (!strcmp (p, "-Wmissing-prototypes"))
650 warn_missing_prototypes = 1;
651 else if (!strcmp (p, "-Wno-missing-prototypes"))
652 warn_missing_prototypes = 0;
653 else if (!strcmp (p, "-Wmissing-declarations"))
654 warn_missing_declarations = 1;
655 else if (!strcmp (p, "-Wno-missing-declarations"))
656 warn_missing_declarations = 0;
657 else if (!strcmp (p, "-Wredundant-decls"))
658 warn_redundant_decls = 1;
659 else if (!strcmp (p, "-Wno-redundant-decls"))
660 warn_redundant_decls = 0;
661 else if (!strcmp (p, "-Wnested-externs"))
662 warn_nested_externs = 1;
663 else if (!strcmp (p, "-Wno-nested-externs"))
664 warn_nested_externs = 0;
665 else if (!strcmp (p, "-Wtraditional"))
666 warn_traditional = 1;
667 else if (!strcmp (p, "-Wno-traditional"))
668 warn_traditional = 0;
669 else if (!strncmp (p, "-Wformat=", 9))
670 set_Wformat (atoi (p + 9));
671 else if (!strcmp (p, "-Wformat"))
673 else if (!strcmp (p, "-Wno-format"))
675 else if (!strcmp (p, "-Wformat-y2k"))
677 else if (!strcmp (p, "-Wno-format-y2k"))
679 else if (!strcmp (p, "-Wformat-extra-args"))
680 warn_format_extra_args = 1;
681 else if (!strcmp (p, "-Wno-format-extra-args"))
682 warn_format_extra_args = 0;
683 else if (!strcmp (p, "-Wformat-nonliteral"))
684 warn_format_nonliteral = 1;
685 else if (!strcmp (p, "-Wno-format-nonliteral"))
686 warn_format_nonliteral = 0;
687 else if (!strcmp (p, "-Wformat-security"))
688 warn_format_security = 1;
689 else if (!strcmp (p, "-Wno-format-security"))
690 warn_format_security = 0;
691 else if (!strcmp (p, "-Wchar-subscripts"))
692 warn_char_subscripts = 1;
693 else if (!strcmp (p, "-Wno-char-subscripts"))
694 warn_char_subscripts = 0;
695 else if (!strcmp (p, "-Wconversion"))
697 else if (!strcmp (p, "-Wno-conversion"))
699 else if (!strcmp (p, "-Wparentheses"))
700 warn_parentheses = 1;
701 else if (!strcmp (p, "-Wno-parentheses"))
702 warn_parentheses = 0;
703 else if (!strcmp (p, "-Wreturn-type"))
704 warn_return_type = 1;
705 else if (!strcmp (p, "-Wno-return-type"))
706 warn_return_type = 0;
707 else if (!strcmp (p, "-Wsequence-point"))
708 warn_sequence_point = 1;
709 else if (!strcmp (p, "-Wno-sequence-point"))
710 warn_sequence_point = 0;
711 else if (!strcmp (p, "-Wcomment"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wno-comment"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wcomments"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wno-comments"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wtrigraphs"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wno-trigraphs"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p, "-Wundef"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p, "-Wno-undef"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p, "-Wimport"))
728 ; /* cpp handles this one. */
729 else if (!strcmp (p, "-Wno-import"))
730 ; /* cpp handles this one. */
731 else if (!strcmp (p, "-Wmissing-braces"))
732 warn_missing_braces = 1;
733 else if (!strcmp (p, "-Wno-missing-braces"))
734 warn_missing_braces = 0;
735 else if (!strcmp (p, "-Wmain"))
737 else if (!strcmp (p, "-Wno-main"))
739 else if (!strcmp (p, "-Wsign-compare"))
740 warn_sign_compare = 1;
741 else if (!strcmp (p, "-Wno-sign-compare"))
742 warn_sign_compare = 0;
743 else if (!strcmp (p, "-Wfloat-equal"))
744 warn_float_equal = 1;
745 else if (!strcmp (p, "-Wno-float-equal"))
746 warn_float_equal = 0;
747 else if (!strcmp (p, "-Wmultichar"))
749 else if (!strcmp (p, "-Wno-multichar"))
751 else if (!strcmp (p, "-Wunknown-pragmas"))
752 /* Set to greater than 1, so that even unknown pragmas in system
753 headers will be warned about. */
754 warn_unknown_pragmas = 2;
755 else if (!strcmp (p, "-Wno-unknown-pragmas"))
756 warn_unknown_pragmas = 0;
757 else if (!strcmp (p, "-Wall"))
759 /* We save the value of warn_uninitialized, since if they put
760 -Wuninitialized on the command line, we need to generate a
761 warning about not using it without also specifying -O. */
762 if (warn_uninitialized != 1)
763 warn_uninitialized = 2;
764 warn_implicit_int = 1;
765 mesg_implicit_function_declaration = 1;
766 warn_return_type = 1;
770 warn_char_subscripts = 1;
771 warn_parentheses = 1;
772 warn_sequence_point = 1;
773 warn_missing_braces = 1;
774 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
775 it off only if it's not explicit. */
777 /* Only warn about unknown pragmas that are not in system headers. */
778 warn_unknown_pragmas = 1;
781 return strings_processed;
786 /* Hooks for print_node. */
789 print_lang_decl (file, node, indent)
790 FILE *file ATTRIBUTE_UNUSED;
791 tree node ATTRIBUTE_UNUSED;
792 int indent ATTRIBUTE_UNUSED;
797 print_lang_type (file, node, indent)
798 FILE *file ATTRIBUTE_UNUSED;
799 tree node ATTRIBUTE_UNUSED;
800 int indent ATTRIBUTE_UNUSED;
805 print_lang_identifier (file, node, indent)
810 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
811 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
812 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
813 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
814 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
815 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
816 if (C_IS_RESERVED_WORD (node))
818 tree rid = ridpointers[C_RID_CODE (node)];
819 indent_to (file, indent + 4);
820 fprintf (file, "rid ");
821 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
822 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
826 /* Hook called at end of compilation to assume 1 elt
827 for a top-level tentative array defn that wasn't complete before. */
830 finish_incomplete_decl (decl)
833 if (TREE_CODE (decl) == VAR_DECL)
835 tree type = TREE_TYPE (decl);
836 if (type != error_mark_node
837 && TREE_CODE (type) == ARRAY_TYPE
838 && ! DECL_EXTERNAL (decl)
839 && TYPE_DOMAIN (type) == 0)
841 warning_with_decl (decl, "array `%s' assumed to have one element");
843 complete_array_type (type, NULL_TREE, 1);
845 layout_decl (decl, 0);
850 /* Create a new `struct binding_level'. */
852 static struct binding_level *
853 make_binding_level ()
856 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
859 /* Nonzero if we are currently in the global binding level. */
864 return current_binding_level == global_binding_level;
870 keep_next_level_flag = 1;
873 /* Nonzero if the current level needs to have a BLOCK made. */
878 return ((current_binding_level->keep_if_subblocks
879 && current_binding_level->blocks != 0)
880 || current_binding_level->keep
881 || current_binding_level->names != 0
882 || (current_binding_level->tags != 0
883 && !current_binding_level->tag_transparent));
886 /* Identify this binding level as a level of parameters.
887 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
888 But it turns out there is no way to pass the right value for
889 DEFINITION_FLAG, so we ignore it. */
892 declare_parm_level (definition_flag)
893 int definition_flag ATTRIBUTE_UNUSED;
895 current_binding_level->parm_flag = 1;
898 /* Nonzero if currently making parm declarations. */
903 return current_binding_level->parm_flag;
906 /* Enter a new binding level.
907 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
908 not for that of tags. */
911 pushlevel (tag_transparent)
914 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
916 /* If this is the top level of a function,
917 just make sure that NAMED_LABELS is 0. */
919 if (current_binding_level == global_binding_level)
924 /* Reuse or create a struct for this binding level. */
926 if (free_binding_level)
928 newlevel = free_binding_level;
929 free_binding_level = free_binding_level->level_chain;
933 newlevel = make_binding_level ();
936 /* Add this level to the front of the chain (stack) of levels that
939 *newlevel = clear_binding_level;
940 newlevel->tag_transparent
942 || (current_binding_level
943 ? current_binding_level->subblocks_tag_transparent
945 newlevel->level_chain = current_binding_level;
946 current_binding_level = newlevel;
947 newlevel->keep = keep_next_level_flag;
948 keep_next_level_flag = 0;
949 newlevel->keep_if_subblocks = keep_next_if_subblocks;
950 keep_next_if_subblocks = 0;
953 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
956 clear_limbo_values (block)
961 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
962 if (DECL_NAME (tem) != 0)
963 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
965 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
966 clear_limbo_values (tem);
969 /* Exit a binding level.
970 Pop the level off, and restore the state of the identifier-decl mappings
971 that were in effect when this level was entered.
973 If KEEP is nonzero, this level had explicit declarations, so
974 and create a "block" (a BLOCK node) for the level
975 to record its declarations and subblocks for symbol table output.
977 If FUNCTIONBODY is nonzero, this level is the body of a function,
978 so create a block as if KEEP were set and also clear out all
981 If REVERSE is nonzero, reverse the order of decls before putting
982 them into the BLOCK. */
985 poplevel (keep, reverse, functionbody)
991 /* The chain of decls was accumulated in reverse order.
992 Put it into forward order, just for cleanliness. */
994 tree tags = current_binding_level->tags;
995 tree subblocks = current_binding_level->blocks;
998 int block_previously_created;
1000 keep |= current_binding_level->keep;
1002 /* This warning is turned off because it causes warnings for
1003 declarations like `extern struct foo *x'. */
1005 /* Warn about incomplete structure types in this level. */
1006 for (link = tags; link; link = TREE_CHAIN (link))
1007 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1009 tree type = TREE_VALUE (link);
1010 tree type_name = TYPE_NAME (type);
1011 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1013 : DECL_NAME (type_name));
1014 switch (TREE_CODE (type))
1017 error ("`struct %s' incomplete in scope ending here", id);
1020 error ("`union %s' incomplete in scope ending here", id);
1023 error ("`enum %s' incomplete in scope ending here", id);
1029 /* Get the decls in the order they were written.
1030 Usually current_binding_level->names is in reverse order.
1031 But parameter decls were previously put in forward order. */
1034 current_binding_level->names
1035 = decls = nreverse (current_binding_level->names);
1037 decls = current_binding_level->names;
1039 /* Output any nested inline functions within this block
1040 if they weren't already output. */
1042 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1043 if (TREE_CODE (decl) == FUNCTION_DECL
1044 && ! TREE_ASM_WRITTEN (decl)
1045 && DECL_INITIAL (decl) != 0
1046 && TREE_ADDRESSABLE (decl))
1048 /* If this decl was copied from a file-scope decl
1049 on account of a block-scope extern decl,
1050 propagate TREE_ADDRESSABLE to the file-scope decl.
1052 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1053 true, since then the decl goes through save_for_inline_copying. */
1054 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1055 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1056 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1059 /* We used to warn about unused variables in expand_end_bindings,
1060 i.e. while generating RTL. But in function-at-a-time mode we may
1061 choose to never expand a function at all (e.g. auto inlining), so
1062 we do this explicitly now. */
1063 warn_about_unused_variables (getdecls ());
1065 /* If there were any declarations or structure tags in that level,
1066 or if this level is a function body,
1067 create a BLOCK to record them for the life of this function. */
1070 block_previously_created = (current_binding_level->this_block != 0);
1071 if (block_previously_created)
1072 block = current_binding_level->this_block;
1073 else if (keep || functionbody
1074 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1075 block = make_node (BLOCK);
1078 BLOCK_VARS (block) = decls;
1079 BLOCK_SUBBLOCKS (block) = subblocks;
1082 /* In each subblock, record that this is its superior. */
1084 for (link = subblocks; link; link = TREE_CHAIN (link))
1085 BLOCK_SUPERCONTEXT (link) = block;
1087 /* Clear out the meanings of the local variables of this level. */
1089 for (link = decls; link; link = TREE_CHAIN (link))
1091 if (DECL_NAME (link) != 0)
1093 /* If the ident. was used or addressed via a local extern decl,
1094 don't forget that fact. */
1095 if (DECL_EXTERNAL (link))
1097 if (TREE_USED (link))
1098 TREE_USED (DECL_NAME (link)) = 1;
1099 if (TREE_ADDRESSABLE (link))
1100 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1102 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1106 /* Restore all name-meanings of the outer levels
1107 that were shadowed by this level. */
1109 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1110 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1112 /* If the level being exited is the top level of a function,
1113 check over all the labels, and clear out the current
1114 (function local) meanings of their names. */
1118 clear_limbo_values (block);
1120 /* If this is the top level block of a function,
1121 the vars are the function's parameters.
1122 Don't leave them in the BLOCK because they are
1123 found in the FUNCTION_DECL instead. */
1125 BLOCK_VARS (block) = 0;
1127 /* Clear out the definitions of all label names,
1128 since their scopes end here,
1129 and add them to BLOCK_VARS. */
1131 for (link = named_labels; link; link = TREE_CHAIN (link))
1133 register tree label = TREE_VALUE (link);
1135 if (DECL_INITIAL (label) == 0)
1137 error_with_decl (label, "label `%s' used but not defined");
1138 /* Avoid crashing later. */
1139 define_label (input_filename, lineno,
1142 else if (warn_unused_label && !TREE_USED (label))
1143 warning_with_decl (label, "label `%s' defined but not used");
1144 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1146 /* Put the labels into the "variables" of the
1147 top-level block, so debugger can see them. */
1148 TREE_CHAIN (label) = BLOCK_VARS (block);
1149 BLOCK_VARS (block) = label;
1153 /* Pop the current level, and free the structure for reuse. */
1156 register struct binding_level *level = current_binding_level;
1157 current_binding_level = current_binding_level->level_chain;
1159 level->level_chain = free_binding_level;
1160 free_binding_level = level;
1163 /* Dispose of the block that we just made inside some higher level. */
1165 DECL_INITIAL (current_function_decl) = block;
1168 if (!block_previously_created)
1169 current_binding_level->blocks
1170 = chainon (current_binding_level->blocks, block);
1172 /* If we did not make a block for the level just exited,
1173 any blocks made for inner levels
1174 (since they cannot be recorded as subblocks in that level)
1175 must be carried forward so they will later become subblocks
1176 of something else. */
1178 current_binding_level->blocks
1179 = chainon (current_binding_level->blocks, subblocks);
1181 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1182 binding contour so that they point to the appropriate construct, i.e.
1183 either to the current FUNCTION_DECL node, or else to the BLOCK node
1184 we just constructed.
1186 Note that for tagged types whose scope is just the formal parameter
1187 list for some function type specification, we can't properly set
1188 their TYPE_CONTEXTs here, because we don't have a pointer to the
1189 appropriate FUNCTION_TYPE node readily available to us. For those
1190 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1191 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1192 node which will represent the "scope" for these "parameter list local"
1196 for (link = tags; link; link = TREE_CHAIN (link))
1197 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1199 for (link = tags; link; link = TREE_CHAIN (link))
1200 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1203 TREE_USED (block) = 1;
1208 /* Delete the node BLOCK from the current binding level.
1209 This is used for the block inside a stmt expr ({...})
1210 so that the block can be reinserted where appropriate. */
1213 delete_block (block)
1217 if (current_binding_level->blocks == block)
1218 current_binding_level->blocks = TREE_CHAIN (block);
1219 for (t = current_binding_level->blocks; t;)
1221 if (TREE_CHAIN (t) == block)
1222 TREE_CHAIN (t) = TREE_CHAIN (block);
1226 TREE_CHAIN (block) = NULL;
1227 /* Clear TREE_USED which is always set by poplevel.
1228 The flag is set again if insert_block is called. */
1229 TREE_USED (block) = 0;
1232 /* Insert BLOCK at the end of the list of subblocks of the
1233 current binding level. This is used when a BIND_EXPR is expanded,
1234 to handle the BLOCK node inside the BIND_EXPR. */
1237 insert_block (block)
1240 TREE_USED (block) = 1;
1241 current_binding_level->blocks
1242 = chainon (current_binding_level->blocks, block);
1245 /* Set the BLOCK node for the innermost scope
1246 (the one we are currently in). */
1250 register tree block;
1252 current_binding_level->this_block = block;
1253 current_binding_level->names = chainon (current_binding_level->names,
1254 BLOCK_VARS (block));
1255 current_binding_level->blocks = chainon (current_binding_level->blocks,
1256 BLOCK_SUBBLOCKS (block));
1262 register struct binding_level *newlevel;
1264 /* Reuse or create a struct for this binding level. */
1266 if (free_binding_level)
1268 newlevel = free_binding_level;
1269 free_binding_level = free_binding_level->level_chain;
1273 newlevel = make_binding_level ();
1276 /* Add this level to the front of the chain (stack) of label levels. */
1278 newlevel->level_chain = label_level_chain;
1279 label_level_chain = newlevel;
1281 newlevel->names = named_labels;
1282 newlevel->shadowed = shadowed_labels;
1284 shadowed_labels = 0;
1290 register struct binding_level *level = label_level_chain;
1293 /* Clear out the definitions of the declared labels in this level.
1294 Leave in the list any ordinary, non-declared labels. */
1295 for (link = named_labels, prev = 0; link;)
1297 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1299 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1301 error_with_decl (TREE_VALUE (link),
1302 "label `%s' used but not defined");
1303 /* Avoid crashing later. */
1304 define_label (input_filename, lineno,
1305 DECL_NAME (TREE_VALUE (link)));
1307 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1308 warning_with_decl (TREE_VALUE (link),
1309 "label `%s' defined but not used");
1310 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1312 /* Delete this element from the list. */
1313 link = TREE_CHAIN (link);
1315 TREE_CHAIN (prev) = link;
1317 named_labels = link;
1322 link = TREE_CHAIN (link);
1326 /* Bring back all the labels that were shadowed. */
1327 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1328 if (DECL_NAME (TREE_VALUE (link)) != 0)
1329 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1330 = TREE_VALUE (link);
1332 named_labels = chainon (named_labels, level->names);
1333 shadowed_labels = level->shadowed;
1335 /* Pop the current level, and free the structure for reuse. */
1336 label_level_chain = label_level_chain->level_chain;
1337 level->level_chain = free_binding_level;
1338 free_binding_level = level;
1341 /* Push a definition or a declaration of struct, union or enum tag "name".
1342 "type" should be the type node.
1343 We assume that the tag "name" is not already defined.
1345 Note that the definition may really be just a forward reference.
1346 In that case, the TYPE_SIZE will be zero. */
1349 pushtag (name, type)
1352 register struct binding_level *b;
1354 /* Find the proper binding level for this type tag. */
1356 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1361 /* Record the identifier as the type's name if it has none. */
1363 if (TYPE_NAME (type) == 0)
1364 TYPE_NAME (type) = name;
1367 b->tags = tree_cons (name, type, b->tags);
1369 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1370 tagged type we just added to the current binding level. This fake
1371 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1372 to output a representation of a tagged type, and it also gives
1373 us a convenient place to record the "scope start" address for the
1376 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1378 /* An approximation for now, so we can tell this is a function-scope tag.
1379 This will be updated in poplevel. */
1380 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1383 /* Handle when a new declaration NEWDECL
1384 has the same name as an old one OLDDECL
1385 in the same binding contour.
1386 Prints an error message if appropriate.
1388 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1389 Otherwise, return 0.
1391 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1392 and OLDDECL is in an outer binding level and should thus not be changed. */
1395 duplicate_decls (newdecl, olddecl, different_binding_level)
1396 register tree newdecl, olddecl;
1397 int different_binding_level;
1399 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1400 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1401 && DECL_INITIAL (newdecl) != 0);
1402 tree oldtype = TREE_TYPE (olddecl);
1403 tree newtype = TREE_TYPE (newdecl);
1406 if (DECL_P (olddecl))
1407 DECL_ATTRIBUTES (newdecl)
1408 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1410 if (TREE_CODE (newtype) == ERROR_MARK
1411 || TREE_CODE (oldtype) == ERROR_MARK)
1414 /* New decl is completely inconsistent with the old one =>
1415 tell caller to replace the old one.
1416 This is always an error except in the case of shadowing a builtin. */
1417 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1419 if (TREE_CODE (olddecl) == FUNCTION_DECL
1420 && (DECL_BUILT_IN (olddecl)
1421 || DECL_BUILT_IN_NONANSI (olddecl)))
1423 /* If you declare a built-in or predefined function name as static,
1424 the old definition is overridden,
1425 but optionally warn this was a bad choice of name. */
1426 if (!TREE_PUBLIC (newdecl))
1430 else if (DECL_BUILT_IN (olddecl))
1431 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1433 warning_with_decl (newdecl, "shadowing library function `%s'");
1435 /* Likewise, if the built-in is not ansi, then programs can
1436 override it even globally without an error. */
1437 else if (! DECL_BUILT_IN (olddecl))
1438 warning_with_decl (newdecl,
1439 "library function `%s' declared as non-function");
1441 else if (DECL_BUILT_IN_NONANSI (olddecl))
1442 warning_with_decl (newdecl,
1443 "built-in function `%s' declared as non-function");
1445 warning_with_decl (newdecl,
1446 "built-in function `%s' declared as non-function");
1450 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1451 error_with_decl (olddecl, "previous declaration of `%s'");
1457 /* For real parm decl following a forward decl,
1458 return 1 so old decl will be reused. */
1459 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1460 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1463 /* The new declaration is the same kind of object as the old one.
1464 The declarations may partially match. Print warnings if they don't
1465 match enough. Ultimately, copy most of the information from the new
1466 decl to the old one, and keep using the old one. */
1468 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1469 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1470 && DECL_INITIAL (olddecl) == 0)
1471 /* If -traditional, avoid error for redeclaring fcn
1472 after implicit decl. */
1474 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && DECL_BUILT_IN (olddecl))
1477 /* A function declaration for a built-in function. */
1478 if (!TREE_PUBLIC (newdecl))
1480 /* If you declare a built-in function name as static, the
1481 built-in definition is overridden,
1482 but optionally warn this was a bad choice of name. */
1484 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1485 /* Discard the old built-in function. */
1488 else if (!types_match)
1490 /* Accept the return type of the new declaration if same modes. */
1491 tree oldreturntype = TREE_TYPE (oldtype);
1492 tree newreturntype = TREE_TYPE (newtype);
1494 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1496 /* Function types may be shared, so we can't just modify
1497 the return type of olddecl's function type. */
1499 = build_function_type (newreturntype,
1500 TYPE_ARG_TYPES (oldtype));
1502 types_match = comptypes (newtype, trytype);
1506 /* Accept harmless mismatch in first argument type also.
1507 This is for the ffs and fprintf builtins. */
1508 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1509 && TYPE_ARG_TYPES (oldtype) != 0
1510 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1511 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1512 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1513 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1515 /* Function types may be shared, so we can't just modify
1516 the return type of olddecl's function type. */
1518 = build_function_type (TREE_TYPE (oldtype),
1519 tree_cons (NULL_TREE,
1520 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1521 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1523 types_match = comptypes (newtype, trytype);
1527 if (! different_binding_level)
1528 TREE_TYPE (olddecl) = oldtype;
1532 /* If types don't match for a built-in, throw away the built-in. */
1533 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1537 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1538 && DECL_SOURCE_LINE (olddecl) == 0)
1540 /* A function declaration for a predeclared function
1541 that isn't actually built in. */
1542 if (!TREE_PUBLIC (newdecl))
1544 /* If you declare it as static, the
1545 default definition is overridden. */
1548 else if (!types_match)
1550 /* If the types don't match, preserve volatility indication.
1551 Later on, we will discard everything else about the
1552 default declaration. */
1553 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1556 /* Permit char *foo () to match void *foo (...) if not pedantic,
1557 if one of them came from a system header file. */
1558 else if (!types_match
1559 && TREE_CODE (olddecl) == FUNCTION_DECL
1560 && TREE_CODE (newdecl) == FUNCTION_DECL
1561 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1562 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1563 && (DECL_IN_SYSTEM_HEADER (olddecl)
1564 || DECL_IN_SYSTEM_HEADER (newdecl))
1565 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1566 && TYPE_ARG_TYPES (oldtype) == 0
1567 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1568 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1570 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1571 && TYPE_ARG_TYPES (newtype) == 0
1572 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1573 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1576 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1577 /* Make sure we keep void * as ret type, not char *. */
1578 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1579 TREE_TYPE (newdecl) = newtype = oldtype;
1581 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1582 we will come back here again. */
1583 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1585 else if (!types_match
1586 /* Permit char *foo (int, ...); followed by char *foo ();
1588 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1590 /* Return types must still match. */
1591 && comptypes (TREE_TYPE (oldtype),
1592 TREE_TYPE (newtype))
1593 && TYPE_ARG_TYPES (newtype) == 0))
1595 error_with_decl (newdecl, "conflicting types for `%s'");
1596 /* Check for function type mismatch
1597 involving an empty arglist vs a nonempty one. */
1598 if (TREE_CODE (olddecl) == FUNCTION_DECL
1599 && comptypes (TREE_TYPE (oldtype),
1600 TREE_TYPE (newtype))
1601 && ((TYPE_ARG_TYPES (oldtype) == 0
1602 && DECL_INITIAL (olddecl) == 0)
1604 (TYPE_ARG_TYPES (newtype) == 0
1605 && DECL_INITIAL (newdecl) == 0)))
1607 /* Classify the problem further. */
1608 register tree t = TYPE_ARG_TYPES (oldtype);
1610 t = TYPE_ARG_TYPES (newtype);
1611 for (; t; t = TREE_CHAIN (t))
1613 register tree type = TREE_VALUE (t);
1615 if (TREE_CHAIN (t) == 0
1616 && TYPE_MAIN_VARIANT (type) != void_type_node)
1618 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1622 if (simple_type_promotes_to (type) != NULL_TREE)
1624 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1629 error_with_decl (olddecl, "previous declaration of `%s'");
1633 errmsg = redeclaration_error_message (newdecl, olddecl);
1639 error_with_decl (newdecl, "redefinition of `%s'");
1642 error_with_decl (newdecl, "redeclaration of `%s'");
1645 error_with_decl (newdecl, "conflicting declarations of `%s'");
1651 error_with_decl (olddecl,
1652 ((DECL_INITIAL (olddecl)
1653 && current_binding_level == global_binding_level)
1654 ? "`%s' previously defined here"
1655 : "`%s' previously declared here"));
1657 else if (TREE_CODE (newdecl) == TYPE_DECL
1658 && (DECL_IN_SYSTEM_HEADER (olddecl)
1659 || DECL_IN_SYSTEM_HEADER (newdecl)))
1661 warning_with_decl (newdecl, "redefinition of `%s'");
1664 ((DECL_INITIAL (olddecl)
1665 && current_binding_level == global_binding_level)
1666 ? "`%s' previously defined here"
1667 : "`%s' previously declared here"));
1669 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1670 && DECL_INITIAL (olddecl) != 0
1671 && TYPE_ARG_TYPES (oldtype) == 0
1672 && TYPE_ARG_TYPES (newtype) != 0
1673 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1675 register tree type, parm;
1677 /* Prototype decl follows defn w/o prototype. */
1679 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1680 type = TYPE_ARG_TYPES (newtype),
1683 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1685 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1686 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1688 warning_with_decl (newdecl, "prototype for `%s' follows");
1689 warning_with_decl (olddecl, "non-prototype definition here");
1692 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1693 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1695 error_with_decl (newdecl,
1696 "prototype for `%s' follows and number of arguments doesn't match");
1697 error_with_decl (olddecl, "non-prototype definition here");
1701 /* Type for passing arg must be consistent
1702 with that declared for the arg. */
1703 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1704 /* If -traditional, allow `unsigned int' instead of `int'
1705 in the prototype. */
1706 && (! (flag_traditional
1707 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1708 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1710 error_with_decl (newdecl,
1711 "prototype for `%s' follows and argument %d doesn't match",
1713 error_with_decl (olddecl, "non-prototype definition here");
1719 /* Warn about mismatches in various flags. */
1722 /* Warn if function is now inline
1723 but was previously declared not inline and has been called. */
1724 if (TREE_CODE (olddecl) == FUNCTION_DECL
1725 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1726 && TREE_USED (olddecl))
1727 warning_with_decl (newdecl,
1728 "`%s' declared inline after being called");
1729 if (TREE_CODE (olddecl) == FUNCTION_DECL
1730 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1731 && DECL_INITIAL (olddecl) != 0)
1732 warning_with_decl (newdecl,
1733 "`%s' declared inline after its definition");
1735 /* If pedantic, warn when static declaration follows a non-static
1736 declaration. Otherwise, do so only for functions. */
1737 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1738 && TREE_PUBLIC (olddecl)
1739 && !TREE_PUBLIC (newdecl))
1740 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1742 /* If warn_traditional, warn when a non-static function
1743 declaration follows a static one. */
1744 if (warn_traditional && !in_system_header
1745 && TREE_CODE (olddecl) == FUNCTION_DECL
1746 && !TREE_PUBLIC (olddecl)
1747 && TREE_PUBLIC (newdecl))
1748 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1750 /* Warn when const declaration follows a non-const
1751 declaration, but not for functions. */
1752 if (TREE_CODE (olddecl) != FUNCTION_DECL
1753 && !TREE_READONLY (olddecl)
1754 && TREE_READONLY (newdecl))
1755 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1756 /* These bits are logically part of the type, for variables.
1757 But not for functions
1758 (where qualifiers are not valid ANSI anyway). */
1759 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1760 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1761 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1762 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1766 /* Optionally warn about more than one declaration for the same name. */
1767 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1768 /* Don't warn about a function declaration
1769 followed by a definition. */
1770 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1771 && DECL_INITIAL (olddecl) == 0)
1772 /* Don't warn about extern decl followed by (tentative) definition. */
1773 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1775 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1776 warning_with_decl (olddecl, "previous declaration of `%s'");
1779 /* Copy all the DECL_... slots specified in the new decl
1780 except for any that we copy here from the old type.
1782 Past this point, we don't change OLDTYPE and NEWTYPE
1783 even if we change the types of NEWDECL and OLDDECL. */
1787 /* When copying info to olddecl, we store into write_olddecl
1788 instead. This allows us to avoid modifying olddecl when
1789 different_binding_level is true. */
1790 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1792 /* Merge the data types specified in the two decls. */
1793 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1795 if (different_binding_level)
1797 if (TYPE_ARG_TYPES (oldtype) != 0
1798 && TYPE_ARG_TYPES (newtype) == 0)
1799 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1802 = build_type_attribute_variant
1804 merge_attributes (TYPE_ATTRIBUTES (newtype),
1805 TYPE_ATTRIBUTES (oldtype)));
1809 = TREE_TYPE (olddecl)
1810 = common_type (newtype, oldtype);
1813 /* Lay the type out, unless already done. */
1814 if (oldtype != TREE_TYPE (newdecl))
1816 if (TREE_TYPE (newdecl) != error_mark_node)
1817 layout_type (TREE_TYPE (newdecl));
1818 if (TREE_CODE (newdecl) != FUNCTION_DECL
1819 && TREE_CODE (newdecl) != TYPE_DECL
1820 && TREE_CODE (newdecl) != CONST_DECL)
1821 layout_decl (newdecl, 0);
1825 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1826 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1827 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1828 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1829 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1830 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1832 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1833 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1837 /* Keep the old rtl since we can safely use it. */
1838 COPY_DECL_RTL (olddecl, newdecl);
1840 /* Merge the type qualifiers. */
1841 if (TREE_CODE (olddecl) == FUNCTION_DECL
1842 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1843 && ! TREE_THIS_VOLATILE (newdecl))
1844 TREE_THIS_VOLATILE (write_olddecl) = 0;
1846 if (TREE_READONLY (newdecl))
1847 TREE_READONLY (write_olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1851 TREE_THIS_VOLATILE (write_olddecl) = 1;
1852 if (TREE_CODE (newdecl) == VAR_DECL
1853 /* If an automatic variable is re-declared in the same
1854 function scope, but the old declaration was not
1855 volatile, make_var_volatile() would crash because the
1856 variable would have been assigned to a pseudo, not a
1857 MEM. Since this duplicate declaration is invalid
1858 anyway, we just skip the call. */
1860 make_var_volatile (newdecl);
1863 /* Keep source location of definition rather than declaration. */
1864 /* When called with different_binding_level set, keep the old
1865 information so that meaningful diagnostics can be given. */
1866 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1867 && ! different_binding_level)
1869 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1870 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1873 /* Merge the unused-warning information. */
1874 if (DECL_IN_SYSTEM_HEADER (olddecl))
1875 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1876 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1877 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1879 /* Merge the initialization information. */
1880 /* When called with different_binding_level set, don't copy over
1881 DECL_INITIAL, so that we don't accidentally change function
1882 declarations into function definitions. */
1883 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1884 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1886 /* Merge the section attribute.
1887 We want to issue an error if the sections conflict but that must be
1888 done later in decl_attributes since we are called before attributes
1890 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1891 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1893 /* Copy the assembler name.
1894 Currently, it can only be defined in the prototype. */
1895 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1897 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1899 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1900 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1902 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1903 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1904 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1905 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1906 DECL_NO_LIMIT_STACK (newdecl)
1907 |= DECL_NO_LIMIT_STACK (olddecl);
1910 /* If cannot merge, then use the new type and qualifiers,
1911 and don't preserve the old rtl. */
1912 else if (! different_binding_level)
1914 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1915 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1916 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1917 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1920 /* Merge the storage class information. */
1921 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1922 /* For functions, static overrides non-static. */
1923 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1925 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1926 /* This is since we don't automatically
1927 copy the attributes of NEWDECL into OLDDECL. */
1928 /* No need to worry about different_binding_level here because
1929 then TREE_PUBLIC (newdecl) was true. */
1930 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1931 /* If this clears `static', clear it in the identifier too. */
1932 if (! TREE_PUBLIC (olddecl))
1933 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1935 if (DECL_EXTERNAL (newdecl))
1937 if (! different_binding_level)
1939 /* Don't mess with these flags on local externs; they remain
1940 external even if there's a declaration at file scope which
1942 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1943 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1945 /* An extern decl does not override previous storage class. */
1946 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1947 if (! DECL_EXTERNAL (newdecl))
1948 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1952 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1953 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1956 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1958 /* If we're redefining a function previously defined as extern
1959 inline, make sure we emit debug info for the inline before we
1960 throw it away, in case it was inlined into a function that hasn't
1961 been written out yet. */
1962 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1964 (*debug_hooks->outlining_inline_function) (olddecl);
1966 /* The new defn must not be inline. */
1967 DECL_INLINE (newdecl) = 0;
1968 DECL_UNINLINABLE (newdecl) = 1;
1972 /* If either decl says `inline', this fn is inline,
1973 unless its definition was passed already. */
1974 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1975 DECL_INLINE (olddecl) = 1;
1977 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1980 if (DECL_BUILT_IN (olddecl))
1982 /* Get rid of any built-in function if new arg types don't match it
1983 or if we have a function definition. */
1984 if (! types_match || new_is_definition)
1986 if (! different_binding_level)
1988 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1989 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1994 /* If redeclaring a builtin function, and not a definition,
1995 it stays built in. */
1996 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1997 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2000 /* Also preserve various other info from the definition. */
2001 else if (! new_is_definition)
2002 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2003 if (! new_is_definition)
2005 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2006 /* When called with different_binding_level set, don't copy over
2007 DECL_INITIAL, so that we don't accidentally change function
2008 declarations into function definitions. */
2009 if (! different_binding_level)
2010 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2011 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2012 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2013 if (DECL_INLINE (newdecl))
2014 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2017 if (different_binding_level)
2020 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2021 But preserve OLDDECL's DECL_UID. */
2023 register unsigned olddecl_uid = DECL_UID (olddecl);
2025 memcpy ((char *) olddecl + sizeof (struct tree_common),
2026 (char *) newdecl + sizeof (struct tree_common),
2027 sizeof (struct tree_decl) - sizeof (struct tree_common));
2028 DECL_UID (olddecl) = olddecl_uid;
2031 /* NEWDECL contains the merged attribute lists.
2032 Update OLDDECL to be the same. */
2033 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2038 /* Record a decl-node X as belonging to the current lexical scope.
2039 Check for errors (such as an incompatible declaration for the same
2040 name already seen in the same scope).
2042 Returns either X or an old decl for the same name.
2043 If an old decl is returned, it may have been smashed
2044 to agree with what X says. */
2051 register tree name = DECL_NAME (x);
2052 register struct binding_level *b = current_binding_level;
2054 DECL_CONTEXT (x) = current_function_decl;
2055 /* A local extern declaration for a function doesn't constitute nesting.
2056 A local auto declaration does, since it's a forward decl
2057 for a nested function coming later. */
2058 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2059 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2060 DECL_CONTEXT (x) = 0;
2062 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2063 && x != IDENTIFIER_IMPLICIT_DECL (name)
2064 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2065 && !DECL_IN_SYSTEM_HEADER (x))
2066 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2072 int different_binding_level = 0;
2074 t = lookup_name_current_level (name);
2075 /* Don't type check externs here when -traditional. This is so that
2076 code with conflicting declarations inside blocks will get warnings
2077 not errors. X11 for instance depends on this. */
2078 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2080 t = IDENTIFIER_GLOBAL_VALUE (name);
2081 /* Type decls at global scope don't conflict with externs declared
2082 inside lexical blocks. */
2083 if (t && TREE_CODE (t) == TYPE_DECL)
2085 different_binding_level = 1;
2087 if (t != 0 && t == error_mark_node)
2088 /* error_mark_node is 0 for a while during initialization! */
2091 error_with_decl (x, "`%s' used prior to declaration");
2096 file = DECL_SOURCE_FILE (t);
2097 line = DECL_SOURCE_LINE (t);
2100 /* If this decl is `static' and an implicit decl was seen previously,
2101 warn. But don't complain if -traditional,
2102 since traditional compilers don't complain. */
2103 if (! flag_traditional && TREE_PUBLIC (name)
2104 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2105 sets this for all functions. */
2106 && ! TREE_PUBLIC (x)
2107 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2108 /* We used to warn also for explicit extern followed by static,
2109 but sometimes you need to do it that way. */
2110 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2112 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2113 IDENTIFIER_POINTER (name));
2114 pedwarn_with_file_and_line
2115 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2116 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2117 "previous declaration of `%s'",
2118 IDENTIFIER_POINTER (name));
2119 TREE_THIS_VOLATILE (name) = 1;
2122 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2124 if (TREE_CODE (t) == PARM_DECL)
2126 /* Don't allow more than one "real" duplicate
2127 of a forward parm decl. */
2128 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2134 /* If we are processing a typedef statement, generate a whole new
2135 ..._TYPE node (which will be just an variant of the existing
2136 ..._TYPE node with identical properties) and then install the
2137 TYPE_DECL node generated to represent the typedef name as the
2138 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2140 The whole point here is to end up with a situation where each
2141 and every ..._TYPE node the compiler creates will be uniquely
2142 associated with AT MOST one node representing a typedef name.
2143 This way, even though the compiler substitutes corresponding
2144 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2145 early on, later parts of the compiler can always do the reverse
2146 translation and get back the corresponding typedef name. For
2149 typedef struct S MY_TYPE;
2152 Later parts of the compiler might only know that `object' was of
2153 type `struct S' if it were not for code just below. With this
2154 code however, later parts of the compiler see something like:
2156 struct S' == struct S
2157 typedef struct S' MY_TYPE;
2160 And they can then deduce (from the node for type struct S') that
2161 the original object declaration was:
2165 Being able to do this is important for proper support of protoize,
2166 and also for generating precise symbolic debugging information
2167 which takes full account of the programmer's (typedef) vocabulary.
2169 Obviously, we don't want to generate a duplicate ..._TYPE node if
2170 the TYPE_DECL node that we are now processing really represents a
2171 standard built-in type.
2173 Since all standard types are effectively declared at line zero
2174 in the source file, we can easily check to see if we are working
2175 on a standard type by checking the current value of lineno. */
2177 if (TREE_CODE (x) == TYPE_DECL)
2179 if (DECL_SOURCE_LINE (x) == 0)
2181 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2182 TYPE_NAME (TREE_TYPE (x)) = x;
2184 else if (TREE_TYPE (x) != error_mark_node
2185 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2187 tree tt = TREE_TYPE (x);
2188 DECL_ORIGINAL_TYPE (x) = tt;
2189 tt = build_type_copy (tt);
2191 TREE_USED (tt) = TREE_USED (x);
2196 /* Multiple external decls of the same identifier ought to match.
2197 Check against both global declarations (when traditional) and out of
2198 scope (limbo) block level declarations.
2200 We get warnings about inline functions where they are defined.
2201 Avoid duplicate warnings where they are used. */
2203 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2207 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2208 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2209 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2210 decl = IDENTIFIER_GLOBAL_VALUE (name);
2211 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2212 /* Decls in limbo are always extern, so no need to check that. */
2213 decl = IDENTIFIER_LIMBO_VALUE (name);
2217 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2218 /* If old decl is built-in, we already warned if we should. */
2219 && !DECL_BUILT_IN (decl))
2221 pedwarn_with_decl (x,
2222 "type mismatch with previous external decl");
2223 pedwarn_with_decl (decl, "previous external decl of `%s'");
2227 /* If a function has had an implicit declaration, and then is defined,
2228 make sure they are compatible. */
2230 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2231 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2232 && TREE_CODE (x) == FUNCTION_DECL
2233 && ! comptypes (TREE_TYPE (x),
2234 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2236 warning_with_decl (x, "type mismatch with previous implicit declaration");
2237 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2238 "previous implicit declaration of `%s'");
2241 /* In PCC-compatibility mode, extern decls of vars with no current decl
2242 take effect at top level no matter where they are. */
2243 if (flag_traditional && DECL_EXTERNAL (x)
2244 && lookup_name (name) == 0)
2246 tree type = TREE_TYPE (x);
2248 /* But don't do this if the type contains temporary nodes. */
2251 if (type == error_mark_node)
2253 if (TYPE_CONTEXT (type))
2255 warning_with_decl (x, "type of external `%s' is not global");
2256 /* By exiting the loop early, we leave TYPE nonzero,
2257 and thus prevent globalization of the decl. */
2260 else if (TREE_CODE (type) == FUNCTION_TYPE
2261 && TYPE_ARG_TYPES (type) != 0)
2262 /* The types might not be truly local,
2263 but the list of arg types certainly is temporary.
2264 Since prototypes are nontraditional,
2265 ok not to do the traditional thing. */
2267 type = TREE_TYPE (type);
2271 b = global_binding_level;
2274 /* This name is new in its binding level.
2275 Install the new declaration and return it. */
2276 if (b == global_binding_level)
2278 /* Install a global value. */
2280 /* If the first global decl has external linkage,
2281 warn if we later see static one. */
2282 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2283 TREE_PUBLIC (name) = 1;
2285 IDENTIFIER_GLOBAL_VALUE (name) = x;
2287 /* We no longer care about any previous block level declarations. */
2288 IDENTIFIER_LIMBO_VALUE (name) = 0;
2290 /* Don't forget if the function was used via an implicit decl. */
2291 if (IDENTIFIER_IMPLICIT_DECL (name)
2292 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2293 TREE_USED (x) = 1, TREE_USED (name) = 1;
2295 /* Don't forget if its address was taken in that way. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_ADDRESSABLE (x) = 1;
2300 /* Warn about mismatches against previous implicit decl. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2302 /* If this real decl matches the implicit, don't complain. */
2303 && ! (TREE_CODE (x) == FUNCTION_DECL
2304 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2305 == integer_type_node)))
2306 pedwarn ("`%s' was previously implicitly declared to return `int'",
2307 IDENTIFIER_POINTER (name));
2309 /* If this decl is `static' and an `extern' was seen previously,
2310 that is erroneous. */
2311 if (TREE_PUBLIC (name)
2312 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2314 /* Okay to redeclare an ANSI built-in as static. */
2315 if (t != 0 && DECL_BUILT_IN (t))
2317 /* Okay to declare a non-ANSI built-in as anything. */
2318 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2320 /* Okay to have global type decl after an earlier extern
2321 declaration inside a lexical block. */
2322 else if (TREE_CODE (x) == TYPE_DECL)
2324 else if (IDENTIFIER_IMPLICIT_DECL (name))
2326 if (! TREE_THIS_VOLATILE (name))
2327 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2328 IDENTIFIER_POINTER (name));
2331 pedwarn ("`%s' was declared `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2337 /* Here to install a non-global value. */
2338 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2339 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2341 IDENTIFIER_LOCAL_VALUE (name) = x;
2343 /* If this is an extern function declaration, see if we
2344 have a global definition or declaration for the function. */
2347 && TREE_CODE (x) == FUNCTION_DECL
2348 && TREE_CODE (oldglobal) == FUNCTION_DECL
2349 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2351 /* We have one. Their types must agree. */
2352 if (! comptypes (TREE_TYPE (x),
2353 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2354 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2357 /* Inner extern decl is inline if global one is.
2358 Copy enough to really inline it. */
2359 if (DECL_INLINE (oldglobal))
2361 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2362 DECL_INITIAL (x) = (current_function_decl == oldglobal
2363 ? 0 : DECL_INITIAL (oldglobal));
2364 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2365 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2366 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2367 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2368 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2369 DECL_ABSTRACT_ORIGIN (x)
2370 = DECL_ABSTRACT_ORIGIN (oldglobal);
2372 /* Inner extern decl is built-in if global one is. */
2373 if (DECL_BUILT_IN (oldglobal))
2375 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2376 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2378 /* Keep the arg types from a file-scope fcn defn. */
2379 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2380 && DECL_INITIAL (oldglobal)
2381 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2382 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2387 /* This case is probably sometimes the right thing to do. */
2388 /* If we have a local external declaration,
2389 then any file-scope declaration should not
2390 have been static. */
2391 if (oldlocal == 0 && oldglobal != 0
2392 && !TREE_PUBLIC (oldglobal)
2393 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2394 warning ("`%s' locally external but globally static",
2395 IDENTIFIER_POINTER (name));
2398 /* If we have a local external declaration,
2399 and no file-scope declaration has yet been seen,
2400 then if we later have a file-scope decl it must not be static. */
2402 && DECL_EXTERNAL (x)
2406 TREE_PUBLIC (name) = 1;
2408 /* Save this decl, so that we can do type checking against
2409 other decls after it falls out of scope.
2411 Only save it once. This prevents temporary decls created in
2412 expand_inline_function from being used here, since this
2413 will have been set when the inline function was parsed.
2414 It also helps give slightly better warnings. */
2415 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2416 IDENTIFIER_LIMBO_VALUE (name) = x;
2419 /* Warn if shadowing an argument at the top level of the body. */
2420 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2421 /* This warning doesn't apply to the parms of a nested fcn. */
2422 && ! current_binding_level->parm_flag
2423 /* Check that this is one level down from the parms. */
2424 && current_binding_level->level_chain->parm_flag
2425 /* Check that the decl being shadowed
2426 comes from the parm level, one level up. */
2427 && chain_member (oldlocal, current_binding_level->level_chain->names))
2429 if (TREE_CODE (oldlocal) == PARM_DECL)
2430 pedwarn ("declaration of `%s' shadows a parameter",
2431 IDENTIFIER_POINTER (name));
2433 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2434 IDENTIFIER_POINTER (name));
2437 /* Maybe warn if shadowing something else. */
2438 else if (warn_shadow && !DECL_EXTERNAL (x)
2439 /* No shadow warnings for internally generated vars. */
2440 && DECL_SOURCE_LINE (x) != 0
2441 /* No shadow warnings for vars made for inlining. */
2442 && ! DECL_FROM_INLINE (x))
2444 const char *id = IDENTIFIER_POINTER (name);
2446 if (TREE_CODE (x) == PARM_DECL
2447 && current_binding_level->level_chain->parm_flag)
2448 /* Don't warn about the parm names in function declarator
2449 within a function declarator.
2450 It would be nice to avoid warning in any function
2451 declarator in a declaration, as opposed to a definition,
2452 but there is no way to tell it's not a definition. */
2454 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2455 warning ("declaration of `%s' shadows a parameter", id);
2456 else if (oldlocal != 0)
2457 warning ("declaration of `%s' shadows previous local", id);
2458 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2459 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2460 warning ("declaration of `%s' shadows global declaration", id);
2463 /* If storing a local value, there may already be one (inherited).
2464 If so, record it for restoration when this binding level ends. */
2466 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2469 /* Keep count of variables in this level with incomplete type.
2470 If the input is erroneous, we can have error_mark in the type
2471 slot (e.g. "f(void a, ...)") - that doesn't count as an
2473 if (TREE_TYPE (x) != error_mark_node
2474 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2478 /* Put decls on list in reverse order.
2479 We will reverse them later if necessary. */
2480 TREE_CHAIN (x) = b->names;
2486 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2489 pushdecl_top_level (x)
2493 register struct binding_level *b = current_binding_level;
2495 current_binding_level = global_binding_level;
2497 current_binding_level = b;
2501 /* Generate an implicit declaration for identifier FUNCTIONID
2502 as a function of type int (). Print a warning if appropriate. */
2505 implicitly_declare (functionid)
2509 int traditional_warning = 0;
2510 /* Only one "implicit declaration" warning per identifier. */
2511 int implicit_warning;
2513 /* We used to reuse an old implicit decl here,
2514 but this loses with inline functions because it can clobber
2515 the saved decl chains. */
2517 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2518 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2521 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2523 /* Warn of implicit decl following explicit local extern decl.
2524 This is probably a program designed for traditional C. */
2525 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2526 traditional_warning = 1;
2528 /* Warn once of an implicit declaration. */
2529 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2531 DECL_EXTERNAL (decl) = 1;
2532 TREE_PUBLIC (decl) = 1;
2534 /* Record that we have an implicit decl and this is it. */
2535 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2537 /* ANSI standard says implicit declarations are in the innermost block.
2538 So we record the decl in the standard fashion.
2539 If flag_traditional is set, pushdecl does it top-level. */
2542 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2543 maybe_objc_check_decl (decl);
2545 rest_of_decl_compilation (decl, NULL, 0, 0);
2547 if (implicit_warning)
2548 implicit_decl_warning (functionid);
2549 else if (warn_traditional && traditional_warning)
2550 warning ("function `%s' was previously declared within a block",
2551 IDENTIFIER_POINTER (functionid));
2553 /* Write a record describing this implicit function declaration to the
2554 prototypes file (if requested). */
2556 gen_aux_info_record (decl, 0, 1, 0);
2558 /* Possibly apply some default attributes to this implicit declaration. */
2559 decl_attributes (&decl, NULL_TREE, 0);
2565 implicit_decl_warning (id)
2568 const char *name = IDENTIFIER_POINTER (id);
2569 if (mesg_implicit_function_declaration == 2)
2570 error ("implicit declaration of function `%s'", name);
2571 else if (mesg_implicit_function_declaration == 1)
2572 warning ("implicit declaration of function `%s'", name);
2575 /* Return zero if the declaration NEWDECL is valid
2576 when the declaration OLDDECL (assumed to be for the same name)
2577 has already been seen.
2578 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2579 and 3 if it is a conflicting declaration. */
2582 redeclaration_error_message (newdecl, olddecl)
2583 tree newdecl, olddecl;
2585 if (TREE_CODE (newdecl) == TYPE_DECL)
2587 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2589 /* pushdecl creates distinct types for TYPE_DECLs by calling
2590 build_type_copy, so the above comparison generally fails. We do
2591 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2592 is equivalent to what this code used to do before the build_type_copy
2593 call. The variant type distinction should not matter for traditional
2594 code, because it doesn't have type qualifiers. */
2595 if (flag_traditional
2596 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2598 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2602 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2604 /* Declarations of functions can insist on internal linkage
2605 but they can't be inconsistent with internal linkage,
2606 so there can be no error on that account.
2607 However defining the same name twice is no good. */
2608 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2609 /* However, defining once as extern inline and a second
2610 time in another way is ok. */
2611 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2612 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2616 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2618 /* Objects declared at top level: */
2619 /* If at least one is a reference, it's ok. */
2620 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2622 /* Reject two definitions. */
2623 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2625 /* Now we have two tentative defs, or one tentative and one real def. */
2626 /* Insist that the linkage match. */
2627 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2631 else if (current_binding_level->parm_flag
2632 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2636 /* Newdecl has block scope. If olddecl has block scope also, then
2637 reject two definitions, and reject a definition together with an
2638 external reference. Otherwise, it is OK, because newdecl must
2639 be an extern reference to olddecl. */
2640 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2641 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2647 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2648 Create one if none exists so far for the current function.
2649 This function is called for both label definitions and label references. */
2655 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2657 if (current_function_decl == 0)
2659 error ("label %s referenced outside of any function",
2660 IDENTIFIER_POINTER (id));
2664 /* Use a label already defined or ref'd with this name. */
2667 /* But not if it is inherited and wasn't declared to be inheritable. */
2668 if (DECL_CONTEXT (decl) != current_function_decl
2669 && ! C_DECLARED_LABEL_FLAG (decl))
2670 return shadow_label (id);
2674 decl = build_decl (LABEL_DECL, id, void_type_node);
2676 /* A label not explicitly declared must be local to where it's ref'd. */
2677 DECL_CONTEXT (decl) = current_function_decl;
2679 DECL_MODE (decl) = VOIDmode;
2681 /* Say where one reference is to the label,
2682 for the sake of the error if it is not defined. */
2683 DECL_SOURCE_LINE (decl) = lineno;
2684 DECL_SOURCE_FILE (decl) = input_filename;
2686 IDENTIFIER_LABEL_VALUE (id) = decl;
2688 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2693 /* Make a label named NAME in the current function,
2694 shadowing silently any that may be inherited from containing functions
2695 or containing scopes.
2697 Note that valid use, if the label being shadowed
2698 comes from another scope in the same function,
2699 requires calling declare_nonlocal_label right away. */
2705 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2711 /* Check to make sure that the label hasn't already been declared
2712 at this label scope */
2713 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2714 if (TREE_VALUE (dup) == decl)
2716 error ("duplicate label declaration `%s'",
2717 IDENTIFIER_POINTER (name));
2718 error_with_decl (TREE_VALUE (dup),
2719 "this is a previous declaration");
2720 /* Just use the previous declaration. */
2721 return lookup_label (name);
2724 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2725 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2728 return lookup_label (name);
2731 /* Define a label, specifying the location in the source file.
2732 Return the LABEL_DECL node for the label, if the definition is valid.
2733 Otherwise return 0. */
2736 define_label (filename, line, name)
2737 const char *filename;
2741 tree decl = lookup_label (name);
2743 /* If label with this name is known from an outer context, shadow it. */
2744 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2746 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2747 IDENTIFIER_LABEL_VALUE (name) = 0;
2748 decl = lookup_label (name);
2751 if (warn_traditional && !in_system_header && lookup_name (name))
2752 warning_with_file_and_line (filename, line,
2753 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2754 IDENTIFIER_POINTER (name));
2756 if (DECL_INITIAL (decl) != 0)
2758 error_with_file_and_line (filename, line, "duplicate label `%s'",
2759 IDENTIFIER_POINTER (name));
2764 /* Mark label as having been defined. */
2765 DECL_INITIAL (decl) = error_mark_node;
2766 /* Say where in the source. */
2767 DECL_SOURCE_FILE (decl) = filename;
2768 DECL_SOURCE_LINE (decl) = line;
2773 /* Return the list of declarations of the current level.
2774 Note that this list is in reverse order unless/until
2775 you nreverse it; and when you do nreverse it, you must
2776 store the result back using `storedecls' or you will lose. */
2781 return current_binding_level->names;
2784 /* Return the list of type-tags (for structs, etc) of the current level. */
2789 return current_binding_level->tags;
2792 /* Store the list of declarations of the current level.
2793 This is done for the parameter declarations of a function being defined,
2794 after they are modified in the light of any missing parameters. */
2800 current_binding_level->names = decls;
2803 /* Similarly, store the list of tags of the current level. */
2809 current_binding_level->tags = tags;
2812 /* Given NAME, an IDENTIFIER_NODE,
2813 return the structure (or union or enum) definition for that name.
2814 Searches binding levels from BINDING_LEVEL up to the global level.
2815 If THISLEVEL_ONLY is nonzero, searches only the specified context
2816 (but skips any tag-transparent contexts to find one that is
2817 meaningful for tags).
2818 CODE says which kind of type the caller wants;
2819 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2820 If the wrong kind of type is found, an error is reported. */
2823 lookup_tag (code, name, binding_level, thislevel_only)
2824 enum tree_code code;
2825 struct binding_level *binding_level;
2829 register struct binding_level *level;
2832 for (level = binding_level; level; level = level->level_chain)
2835 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2837 if (TREE_PURPOSE (tail) == name)
2839 if (TREE_CODE (TREE_VALUE (tail)) != code)
2841 /* Definition isn't the kind we were looking for. */
2842 pending_invalid_xref = name;
2843 pending_invalid_xref_file = input_filename;
2844 pending_invalid_xref_line = lineno;
2845 /* If in the same binding level as a declaration as a tag
2846 of a different type, this must not be allowed to
2847 shadow that tag, so give the error immediately.
2848 (For example, "struct foo; union foo;" is invalid.) */
2850 pending_xref_error ();
2852 return TREE_VALUE (tail);
2855 if (! level->tag_transparent)
2865 /* Print an error message now
2866 for a recent invalid struct, union or enum cross reference.
2867 We don't print them immediately because they are not invalid
2868 when used in the `struct foo;' construct for shadowing. */
2871 pending_xref_error ()
2873 if (pending_invalid_xref != 0)
2874 error_with_file_and_line (pending_invalid_xref_file,
2875 pending_invalid_xref_line,
2876 "`%s' defined as wrong kind of tag",
2877 IDENTIFIER_POINTER (pending_invalid_xref));
2878 pending_invalid_xref = 0;
2881 /* Given a type, find the tag that was defined for it and return the tag name.
2882 Otherwise return 0. */
2885 lookup_tag_reverse (type)
2888 register struct binding_level *level;
2890 for (level = current_binding_level; level; level = level->level_chain)
2893 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2895 if (TREE_VALUE (tail) == type)
2896 return TREE_PURPOSE (tail);
2902 /* Look up NAME in the current binding level and its superiors
2903 in the namespace of variables, functions and typedefs.
2904 Return a ..._DECL node of some kind representing its definition,
2905 or return 0 if it is undefined. */
2913 if (current_binding_level != global_binding_level
2914 && IDENTIFIER_LOCAL_VALUE (name))
2915 val = IDENTIFIER_LOCAL_VALUE (name);
2917 val = IDENTIFIER_GLOBAL_VALUE (name);
2921 /* Similar to `lookup_name' but look only at current binding level. */
2924 lookup_name_current_level (name)
2929 if (current_binding_level == global_binding_level)
2930 return IDENTIFIER_GLOBAL_VALUE (name);
2932 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2935 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2936 if (DECL_NAME (t) == name)
2942 /* Mark ARG for GC. */
2945 mark_binding_level (arg)
2948 struct binding_level *level = *(struct binding_level **) arg;
2950 for (; level != 0; level = level->level_chain)
2952 ggc_mark_tree (level->names);
2953 ggc_mark_tree (level->tags);
2954 ggc_mark_tree (level->shadowed);
2955 ggc_mark_tree (level->blocks);
2956 ggc_mark_tree (level->this_block);
2957 ggc_mark_tree (level->parm_order);
2961 /* Create the predefined scalar types of C,
2962 and some nodes representing standard constants (0, 1, (void *) 0).
2963 Initialize the global binding level.
2964 Make definitions for built-in primitive functions. */
2967 init_decl_processing ()
2969 register tree endlink;
2970 tree ptr_ftype_void, ptr_ftype_ptr;
2972 current_function_decl = NULL;
2973 named_labels = NULL;
2974 current_binding_level = NULL_BINDING_LEVEL;
2975 free_binding_level = NULL_BINDING_LEVEL;
2977 /* Make the binding_level structure for global names. */
2979 global_binding_level = current_binding_level;
2981 build_common_tree_nodes (flag_signed_char);
2983 c_common_nodes_and_builtins ();
2985 boolean_type_node = integer_type_node;
2986 boolean_true_node = integer_one_node;
2987 boolean_false_node = integer_zero_node;
2989 /* With GCC, C99's _Bool is always of size 1. */
2990 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2991 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2992 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2993 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2994 TYPE_PRECISION (c_bool_type_node) = 1;
2995 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2997 c_bool_false_node = build_int_2 (0, 0);
2998 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2999 c_bool_true_node = build_int_2 (1, 0);
3000 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3002 endlink = void_list_node;
3003 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3005 = build_function_type (ptr_type_node,
3006 tree_cons (NULL_TREE, ptr_type_node, endlink));
3008 /* Types which are common to the fortran compiler and libf2c. When
3009 changing these, you also need to be concerned with f/com.h. */
3011 if (TYPE_PRECISION (float_type_node)
3012 == TYPE_PRECISION (long_integer_type_node))
3014 g77_integer_type_node = long_integer_type_node;
3015 g77_uinteger_type_node = long_unsigned_type_node;
3017 else if (TYPE_PRECISION (float_type_node)
3018 == TYPE_PRECISION (integer_type_node))
3020 g77_integer_type_node = integer_type_node;
3021 g77_uinteger_type_node = unsigned_type_node;
3024 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3026 if (g77_integer_type_node != NULL_TREE)
3028 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3029 g77_integer_type_node));
3030 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3031 g77_uinteger_type_node));
3034 if (TYPE_PRECISION (float_type_node) * 2
3035 == TYPE_PRECISION (long_integer_type_node))
3037 g77_longint_type_node = long_integer_type_node;
3038 g77_ulongint_type_node = long_unsigned_type_node;
3040 else if (TYPE_PRECISION (float_type_node) * 2
3041 == TYPE_PRECISION (long_long_integer_type_node))
3043 g77_longint_type_node = long_long_integer_type_node;
3044 g77_ulongint_type_node = long_long_unsigned_type_node;
3047 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3049 if (g77_longint_type_node != NULL_TREE)
3051 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3052 g77_longint_type_node));
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3054 g77_ulongint_type_node));
3057 pedantic_lvalues = pedantic;
3059 make_fname_decl = c_make_fname_decl;
3060 start_fname_decls ();
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;
3155 /* Possibly apply some default attributes to this built-in function. */
3156 decl_attributes (&decl, NULL_TREE, 0);
3161 /* Apply default attributes to a function, if a system function with default
3165 insert_default_attributes (decl)
3168 if (!TREE_PUBLIC (decl))
3170 c_common_insert_default_attributes (decl);
3173 /* Called when a declaration is seen that contains no names to declare.
3174 If its type is a reference to a structure, union or enum inherited
3175 from a containing scope, shadow that tag name for the current scope
3176 with a forward reference.
3177 If its type defines a new named structure or union
3178 or defines an enum, it is valid but we need not do anything here.
3179 Otherwise, it is an error. */
3182 shadow_tag (declspecs)
3185 shadow_tag_warned (declspecs, 0);
3189 shadow_tag_warned (declspecs, warned)
3192 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3199 pending_invalid_xref = 0;
3201 /* Remove the attributes from declspecs, since they will confuse the
3203 split_specs_attrs (declspecs, &specs, &attrs);
3205 for (link = specs; link; link = TREE_CHAIN (link))
3207 register tree value = TREE_VALUE (link);
3208 register enum tree_code code = TREE_CODE (value);
3210 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3211 /* Used to test also that TYPE_SIZE (value) != 0.
3212 That caused warning for `struct foo;' at top level in the file. */
3214 register tree name = lookup_tag_reverse (value);
3221 if (warned != 1 && code != ENUMERAL_TYPE)
3222 /* Empty unnamed enum OK */
3224 pedwarn ("unnamed struct/union that defines no instances");
3230 t = lookup_tag (code, name, current_binding_level, 1);
3234 t = make_node (code);
3241 if (!warned && ! in_system_header)
3243 warning ("useless keyword or type name in empty declaration");
3250 error ("two types specified in one empty declaration");
3255 pedwarn ("empty declaration");
3259 /* Construct an array declarator. EXPR is the expression inside [], or
3260 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3261 to the pointer to which a parameter array is converted). STATIC_P is
3262 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3263 is non-zero is the array is [*], a VLA of unspecified length which is
3264 nevertheless a complete type (not currently implemented by GCC),
3265 zero otherwise. The declarator is constructed as an ARRAY_REF
3266 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3267 left of the [] (filled by in set_array_declarator_type) and operand 1
3268 is the expression inside; whose TREE_TYPE is the type qualifiers and
3269 which has TREE_STATIC set if "static" is used. */
3272 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3279 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3280 TREE_TYPE (decl) = quals;
3281 TREE_STATIC (decl) = (static_p ? 1 : 0);
3282 if (pedantic && !flag_isoc99)
3284 if (static_p || quals != NULL_TREE)
3285 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3287 pedwarn ("ISO C89 does not support `[*]' array declarators");
3290 warning ("GCC does not yet properly implement `[*]' array declarators");
3294 /* Set the type of an array declarator. DECL is the declarator, as
3295 constructed by build_array_declarator; TYPE is what appears on the left
3296 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3297 abstract declarator, zero otherwise; this is used to reject static and
3298 type qualifiers in abstract declarators, where they are not in the
3302 set_array_declarator_type (decl, type, abstract_p)
3307 TREE_OPERAND (decl, 0) = type;
3308 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3309 error ("static or type qualifiers in abstract declarator");
3313 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3316 groktypename (typename)
3319 if (TREE_CODE (typename) != TREE_LIST)
3321 return grokdeclarator (TREE_VALUE (typename),
3322 TREE_PURPOSE (typename),
3326 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3329 groktypename_in_parm_context (typename)
3332 if (TREE_CODE (typename) != TREE_LIST)
3334 return grokdeclarator (TREE_VALUE (typename),
3335 TREE_PURPOSE (typename),
3339 /* Decode a declarator in an ordinary declaration or data definition.
3340 This is called as soon as the type information and variable name
3341 have been parsed, before parsing the initializer if any.
3342 Here we create the ..._DECL node, fill in its type,
3343 and put it on the list of decls for the current context.
3344 The ..._DECL node is returned as the value.
3346 Exception: for arrays where the length is not specified,
3347 the type is left null, to be filled in by `finish_decl'.
3349 Function definitions do not come here; they go to start_function
3350 instead. However, external and forward declarations of functions
3351 do go through here. Structure field declarations are done by
3352 grokfield and not through here. */
3355 start_decl (declarator, declspecs, initialized, attributes)
3356 tree declarator, declspecs;
3360 tree decl = grokdeclarator (declarator, declspecs,
3361 NORMAL, initialized);
3364 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3365 && MAIN_NAME_P (DECL_NAME (decl)))
3366 warning_with_decl (decl, "`%s' is usually a function");
3369 /* Is it valid for this decl to have an initializer at all?
3370 If not, set INITIALIZED to zero, which will indirectly
3371 tell `finish_decl' to ignore the initializer once it is parsed. */
3372 switch (TREE_CODE (decl))
3375 /* typedef foo = bar means give foo the same type as bar.
3376 We haven't parsed bar yet, so `finish_decl' will fix that up.
3377 Any other case of an initialization in a TYPE_DECL is an error. */
3378 if (pedantic || list_length (declspecs) > 1)
3380 error ("typedef `%s' is initialized",
3381 IDENTIFIER_POINTER (DECL_NAME (decl)));
3387 error ("function `%s' is initialized like a variable",
3388 IDENTIFIER_POINTER (DECL_NAME (decl)));
3393 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3394 error ("parameter `%s' is initialized",
3395 IDENTIFIER_POINTER (DECL_NAME (decl)));
3400 /* Don't allow initializations for incomplete types
3401 except for arrays which might be completed by the initialization. */
3403 /* This can happen if the array size is an undefined macro. We already
3404 gave a warning, so we don't need another one. */
3405 if (TREE_TYPE (decl) == error_mark_node)
3407 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3409 /* A complete type is ok if size is fixed. */
3411 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3412 || C_DECL_VARIABLE_SIZE (decl))
3414 error ("variable-sized object may not be initialized");
3418 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3420 error ("variable `%s' has initializer but incomplete type",
3421 IDENTIFIER_POINTER (DECL_NAME (decl)));
3424 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3426 error ("elements of array `%s' have incomplete type",
3427 IDENTIFIER_POINTER (DECL_NAME (decl)));
3435 /* Seems redundant with grokdeclarator. */
3436 if (current_binding_level != global_binding_level
3437 && DECL_EXTERNAL (decl)
3438 && TREE_CODE (decl) != FUNCTION_DECL)
3439 warning ("declaration of `%s' has `extern' and is initialized",
3440 IDENTIFIER_POINTER (DECL_NAME (decl)));
3442 DECL_EXTERNAL (decl) = 0;
3443 if (current_binding_level == global_binding_level)
3444 TREE_STATIC (decl) = 1;
3446 /* Tell `pushdecl' this is an initialized decl
3447 even though we don't yet have the initializer expression.
3448 Also tell `finish_decl' it may store the real initializer. */
3449 DECL_INITIAL (decl) = error_mark_node;
3452 /* If this is a function declaration, write a record describing it to the
3453 prototypes file (if requested). */
3455 if (TREE_CODE (decl) == FUNCTION_DECL)
3456 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3458 /* ANSI specifies that a tentative definition which is not merged with
3459 a non-tentative definition behaves exactly like a definition with an
3460 initializer equal to zero. (Section 3.7.2)
3461 -fno-common gives strict ANSI behavior. Usually you don't want it.
3462 This matters only for variables with external linkage. */
3463 if (! flag_no_common || ! TREE_PUBLIC (decl))
3464 DECL_COMMON (decl) = 1;
3466 /* Set attributes here so if duplicate decl, will have proper attributes. */
3467 decl_attributes (&decl, attributes, 0);
3469 /* Add this decl to the current binding level.
3470 TEM may equal DECL or it may be a previous decl of the same name. */
3471 tem = pushdecl (decl);
3473 /* For a local variable, define the RTL now. */
3474 if (current_binding_level != global_binding_level
3475 /* But not if this is a duplicate decl
3476 and we preserved the rtl from the previous one
3477 (which may or may not happen). */
3478 && !DECL_RTL_SET_P (tem)
3479 && !DECL_CONTEXT (tem))
3481 if (TREE_TYPE (tem) != error_mark_node
3482 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3484 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3485 && DECL_INITIAL (tem) != 0)
3492 /* Finish processing of a declaration;
3493 install its initial value.
3494 If the length of an array type is not known before,
3495 it must be determined now, from the initial value, or it is an error. */
3498 finish_decl (decl, init, asmspec_tree)
3502 register tree type = TREE_TYPE (decl);
3503 int was_incomplete = (DECL_SIZE (decl) == 0);
3504 const char *asmspec = 0;
3506 /* If a name was specified, get the string. */
3508 asmspec = TREE_STRING_POINTER (asmspec_tree);
3510 /* If `start_decl' didn't like having an initialization, ignore it now. */
3511 if (init != 0 && DECL_INITIAL (decl) == 0)
3514 /* Don't crash if parm is initialized. */
3515 if (TREE_CODE (decl) == PARM_DECL)
3520 if (TREE_CODE (decl) != TYPE_DECL)
3521 store_init_value (decl, init);
3524 /* typedef foo = bar; store the type of bar as the type of foo. */
3525 TREE_TYPE (decl) = TREE_TYPE (init);
3526 DECL_INITIAL (decl) = init = 0;
3530 /* Deduce size of array from initialization, if not already known */
3531 if (TREE_CODE (type) == ARRAY_TYPE
3532 && TYPE_DOMAIN (type) == 0
3533 && TREE_CODE (decl) != TYPE_DECL)
3536 = (TREE_STATIC (decl)
3537 /* Even if pedantic, an external linkage array
3538 may have incomplete type at first. */
3539 ? pedantic && !TREE_PUBLIC (decl)
3540 : !DECL_EXTERNAL (decl));
3542 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3544 /* Get the completed type made by complete_array_type. */
3545 type = TREE_TYPE (decl);
3548 error_with_decl (decl, "initializer fails to determine size of `%s'");
3550 else if (failure == 2)
3553 error_with_decl (decl, "array size missing in `%s'");
3554 /* If a `static' var's size isn't known,
3555 make it extern as well as static, so it does not get
3557 If it is not `static', then do not mark extern;
3558 finish_incomplete_decl will give it a default size
3559 and it will get allocated. */
3560 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3561 DECL_EXTERNAL (decl) = 1;
3564 /* TYPE_MAX_VALUE is always one less than the number of elements
3565 in the array, because we start counting at zero. Therefore,
3566 warn only if the value is less than zero. */
3567 else if (pedantic && TYPE_DOMAIN (type) != 0
3568 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3569 error_with_decl (decl, "zero or negative size array `%s'");
3571 layout_decl (decl, 0);
3574 if (TREE_CODE (decl) == VAR_DECL)
3576 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3577 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3578 layout_decl (decl, 0);
3580 if (DECL_SIZE (decl) == 0
3581 /* Don't give an error if we already gave one earlier. */
3582 && TREE_TYPE (decl) != error_mark_node
3583 && (TREE_STATIC (decl)
3585 /* A static variable with an incomplete type
3586 is an error if it is initialized.
3587 Also if it is not file scope.
3588 Otherwise, let it through, but if it is not `extern'
3589 then it may cause an error message later. */
3590 (DECL_INITIAL (decl) != 0
3591 || DECL_CONTEXT (decl) != 0)
3593 /* An automatic variable with an incomplete type
3595 !DECL_EXTERNAL (decl)))
3597 error_with_decl (decl, "storage size of `%s' isn't known");
3598 TREE_TYPE (decl) = error_mark_node;
3601 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3602 && DECL_SIZE (decl) != 0)
3604 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3605 constant_expression_warning (DECL_SIZE (decl));
3607 error_with_decl (decl, "storage size of `%s' isn't constant");
3610 if (TREE_USED (type))
3611 TREE_USED (decl) = 1;
3614 /* If this is a function and an assembler name is specified, it isn't
3615 builtin any more. Also reset DECL_RTL so we can give it its new
3617 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3619 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3620 SET_DECL_RTL (decl, NULL_RTX);
3621 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3624 /* Output the assembler code and/or RTL code for variables and functions,
3625 unless the type is an undefined structure or union.
3626 If not, it will get done when the type is completed. */
3628 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3630 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3631 maybe_objc_check_decl (decl);
3633 if (!DECL_CONTEXT (decl))
3635 if (DECL_INITIAL (decl) == NULL_TREE
3636 || DECL_INITIAL (decl) == error_mark_node)
3637 /* Don't output anything
3638 when a tentative file-scope definition is seen.
3639 But at end of compilation, do output code for them. */
3640 DECL_DEFER_OUTPUT (decl) = 1;
3641 rest_of_decl_compilation (decl, asmspec,
3642 (DECL_CONTEXT (decl) == 0
3643 || TREE_ASM_WRITTEN (decl)), 0);
3647 /* This is a local variable. If there is an ASMSPEC, the
3648 user has requested that we handle it specially. */
3651 /* In conjunction with an ASMSPEC, the `register'
3652 keyword indicates that we should place the variable
3653 in a particular register. */
3654 if (DECL_REGISTER (decl))
3655 DECL_C_HARD_REGISTER (decl) = 1;
3657 /* If this is not a static variable, issue a warning.
3658 It doesn't make any sense to give an ASMSPEC for an
3659 ordinary, non-register local variable. Historically,
3660 GCC has accepted -- but ignored -- the ASMSPEC in
3662 if (TREE_CODE (decl) == VAR_DECL
3663 && !DECL_REGISTER (decl)
3664 && !TREE_STATIC (decl))
3665 warning_with_decl (decl,
3666 "ignoring asm-specifier for non-static local variable `%s'");
3668 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3671 add_decl_stmt (decl);
3674 if (DECL_CONTEXT (decl) != 0)
3676 /* Recompute the RTL of a local array now
3677 if it used to be an incomplete type. */
3679 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3681 /* If we used it already as memory, it must stay in memory. */
3682 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3683 /* If it's still incomplete now, no init will save it. */
3684 if (DECL_SIZE (decl) == 0)
3685 DECL_INITIAL (decl) = 0;
3690 if (TREE_CODE (decl) == TYPE_DECL)
3692 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3693 maybe_objc_check_decl (decl);
3694 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3697 /* At the end of a declaration, throw away any variable type sizes
3698 of types defined inside that declaration. There is no use
3699 computing them in the following function definition. */
3700 if (current_binding_level == global_binding_level)
3701 get_pending_sizes ();
3704 /* If DECL has a cleanup, build and return that cleanup here.
3705 This is a callback called by expand_expr. */
3708 maybe_build_cleanup (decl)
3709 tree decl ATTRIBUTE_UNUSED;
3711 /* There are no cleanups in C. */
3715 /* Given a parsed parameter declaration,
3716 decode it into a PARM_DECL and push that on the current binding level.
3717 Also, for the sake of forward parm decls,
3718 record the given order of parms in `parm_order'. */
3721 push_parm_decl (parm)
3725 int old_immediate_size_expand = immediate_size_expand;
3726 /* Don't try computing parm sizes now -- wait till fn is called. */
3727 immediate_size_expand = 0;
3729 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3730 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3731 decl_attributes (&decl, TREE_VALUE (parm), 0);
3734 if (DECL_NAME (decl))
3737 olddecl = lookup_name (DECL_NAME (decl));
3738 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3739 pedwarn_with_decl (decl,
3740 "ANSI C forbids parameter `%s' shadowing typedef");
3744 decl = pushdecl (decl);
3746 immediate_size_expand = old_immediate_size_expand;
3748 current_binding_level->parm_order
3749 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3751 /* Add this decl to the current binding level. */
3752 finish_decl (decl, NULL_TREE, NULL_TREE);
3755 /* Clear the given order of parms in `parm_order'.
3756 Used at start of parm list,
3757 and also at semicolon terminating forward decls. */
3762 current_binding_level->parm_order = NULL_TREE;
3765 /* Make TYPE a complete type based on INITIAL_VALUE.
3766 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3767 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3770 complete_array_type (type, initial_value, do_default)
3775 register tree maxindex = NULL_TREE;
3780 /* Note MAXINDEX is really the maximum index,
3781 one less than the size. */
3782 if (TREE_CODE (initial_value) == STRING_CST)
3785 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3786 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3789 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3791 tree elts = CONSTRUCTOR_ELTS (initial_value);
3792 maxindex = build_int_2 (-1, -1);
3793 for (; elts; elts = TREE_CHAIN (elts))
3795 if (TREE_PURPOSE (elts))
3796 maxindex = TREE_PURPOSE (elts);
3798 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3799 maxindex, integer_one_node));
3801 maxindex = copy_node (maxindex);
3805 /* Make an error message unless that happened already. */
3806 if (initial_value != error_mark_node)
3809 /* Prevent further error messages. */
3810 maxindex = build_int_2 (0, 0);
3817 maxindex = build_int_2 (0, 0);
3823 TYPE_DOMAIN (type) = build_index_type (maxindex);
3824 if (!TREE_TYPE (maxindex))
3825 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3828 /* Lay out the type now that we can get the real answer. */
3835 /* Given declspecs and a declarator,
3836 determine the name and type of the object declared
3837 and construct a ..._DECL node for it.
3838 (In one case we can return a ..._TYPE node instead.
3839 For invalid input we sometimes return 0.)
3841 DECLSPECS is a chain of tree_list nodes whose value fields
3842 are the storage classes and type specifiers.
3844 DECL_CONTEXT says which syntactic context this declaration is in:
3845 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3846 FUNCDEF for a function definition. Like NORMAL but a few different
3847 error messages in each case. Return value may be zero meaning
3848 this definition is too screwy to try to parse.
3849 PARM for a parameter declaration (either within a function prototype
3850 or before a function body). Make a PARM_DECL, or return void_type_node.
3851 TYPENAME if for a typename (in a cast or sizeof).
3852 Don't make a DECL node; just return the ..._TYPE node.
3853 FIELD for a struct or union field; make a FIELD_DECL.
3854 BITFIELD for a field with specified width.
3855 INITIALIZED is 1 if the decl has an initializer.
3857 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3858 It may also be so in the PARM case, for a prototype where the
3859 argument type is specified but not the name.
3861 This function is where the complicated C meanings of `static'
3862 and `extern' are interpreted. */
3865 grokdeclarator (declarator, declspecs, decl_context, initialized)
3868 enum decl_context decl_context;
3873 tree type = NULL_TREE;
3878 int type_quals = TYPE_UNQUALIFIED;
3880 int explicit_int = 0;
3881 int explicit_char = 0;
3882 int defaulted_int = 0;
3883 tree typedef_decl = 0;
3885 tree typedef_type = 0;
3886 int funcdef_flag = 0;
3887 enum tree_code innermost_code = ERROR_MARK;
3889 int size_varies = 0;
3890 tree decl_attr = NULL_TREE;
3891 tree array_ptr_quals = NULL_TREE;
3892 int array_parm_static = 0;
3893 tree returned_attrs = NULL_TREE;
3895 if (decl_context == BITFIELD)
3896 bitfield = 1, decl_context = FIELD;
3898 if (decl_context == FUNCDEF)
3899 funcdef_flag = 1, decl_context = NORMAL;
3901 /* Look inside a declarator for the name being declared
3902 and get it as a string, for an error message. */
3904 register tree decl = declarator;
3908 switch (TREE_CODE (decl))
3913 innermost_code = TREE_CODE (decl);
3914 decl = TREE_OPERAND (decl, 0);
3918 decl = TREE_VALUE (decl);
3921 case IDENTIFIER_NODE:
3922 name = IDENTIFIER_POINTER (decl);
3933 /* A function definition's declarator must have the form of
3934 a function declarator. */
3936 if (funcdef_flag && innermost_code != CALL_EXPR)
3939 /* Anything declared one level down from the top level
3940 must be one of the parameters of a function
3941 (because the body is at least two levels down). */
3943 /* If this looks like a function definition, make it one,
3944 even if it occurs where parms are expected.
3945 Then store_parm_decls will reject it and not use it as a parm. */
3946 if (decl_context == NORMAL && !funcdef_flag
3947 && current_binding_level->parm_flag)
3948 decl_context = PARM;
3950 /* Look through the decl specs and record which ones appear.
3951 Some typespecs are defined as built-in typenames.
3952 Others, the ones that are modifiers of other types,
3953 are represented by bits in SPECBITS: set the bits for
3954 the modifiers that appear. Storage class keywords are also in SPECBITS.
3956 If there is a typedef name or a type, store the type in TYPE.
3957 This includes builtin typedefs such as `int'.
3959 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3960 and did not come from a user typedef.
3962 Set LONGLONG if `long' is mentioned twice. */
3964 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3966 register tree id = TREE_VALUE (spec);
3968 if (id == ridpointers[(int) RID_INT])
3970 if (id == ridpointers[(int) RID_CHAR])
3973 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3975 enum rid i = C_RID_CODE (id);
3976 if ((int) i <= (int) RID_LAST_MODIFIER)
3978 if (i == RID_LONG && (specbits & (1 << (int) i)))
3981 error ("`long long long' is too long for GCC");
3984 if (pedantic && !flag_isoc99 && ! in_system_header
3986 pedwarn ("ISO C89 does not support `long long'");
3990 else if (specbits & (1 << (int) i))
3991 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3992 specbits |= 1 << (int) i;
3997 error ("two or more data types in declaration of `%s'", name);
3998 /* Actual typedefs come to us as TYPE_DECL nodes. */
3999 else if (TREE_CODE (id) == TYPE_DECL)
4001 type = TREE_TYPE (id);
4002 decl_attr = DECL_ATTRIBUTES (id);
4005 /* Built-in types come as identifiers. */
4006 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4008 register tree t = lookup_name (id);
4009 if (TREE_TYPE (t) == error_mark_node)
4011 else if (!t || TREE_CODE (t) != TYPE_DECL)
4012 error ("`%s' fails to be a typedef or built in type",
4013 IDENTIFIER_POINTER (id));
4016 type = TREE_TYPE (t);
4020 else if (TREE_CODE (id) != ERROR_MARK)
4027 typedef_type = type;
4029 size_varies = C_TYPE_VARIABLE_SIZE (type);
4031 /* No type at all: default to `int', and set DEFAULTED_INT
4032 because it was not a user-defined typedef. */
4036 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4037 | (1 << (int) RID_SIGNED)
4038 | (1 << (int) RID_UNSIGNED)
4039 | (1 << (int) RID_COMPLEX))))
4040 /* Don't warn about typedef foo = bar. */
4041 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4042 && ! in_system_header)
4044 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4045 and this is a function, or if -Wimplicit; prefer the former
4046 warning since it is more explicit. */
4047 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4049 warn_about_return_type = 1;
4050 else if (warn_implicit_int || flag_isoc99)
4051 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4056 type = integer_type_node;
4059 /* Now process the modifiers that were specified
4060 and check for invalid combinations. */
4062 /* Long double is a special combination. */
4064 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4065 && TYPE_MAIN_VARIANT (type) == double_type_node)
4067 specbits &= ~(1 << (int) RID_LONG);
4068 type = long_double_type_node;
4071 /* Check all other uses of type modifiers. */
4073 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4074 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4078 if ((specbits & 1 << (int) RID_LONG)
4079 && (specbits & 1 << (int) RID_SHORT))
4080 error ("both long and short specified for `%s'", name);
4081 else if (((specbits & 1 << (int) RID_LONG)
4082 || (specbits & 1 << (int) RID_SHORT))
4084 error ("long or short specified with char for `%s'", name);
4085 else if (((specbits & 1 << (int) RID_LONG)
4086 || (specbits & 1 << (int) RID_SHORT))
4087 && TREE_CODE (type) == REAL_TYPE)
4089 static int already = 0;
4091 error ("long or short specified with floating type for `%s'", name);
4092 if (! already && ! pedantic)
4094 error ("the only valid combination is `long double'");
4098 else if ((specbits & 1 << (int) RID_SIGNED)
4099 && (specbits & 1 << (int) RID_UNSIGNED))
4100 error ("both signed and unsigned specified for `%s'", name);
4101 else if (TREE_CODE (type) != INTEGER_TYPE)
4102 error ("long, short, signed or unsigned invalid for `%s'", name);
4106 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4108 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4110 if (flag_pedantic_errors)
4115 /* Discard the type modifiers if they are invalid. */
4118 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4119 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4124 if ((specbits & (1 << (int) RID_COMPLEX))
4125 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4127 error ("complex invalid for `%s'", name);
4128 specbits &= ~(1 << (int) RID_COMPLEX);
4131 /* Decide whether an integer type is signed or not.
4132 Optionally treat bitfields as signed by default. */
4133 if (specbits & 1 << (int) RID_UNSIGNED
4134 /* Traditionally, all bitfields are unsigned. */
4135 || (bitfield && flag_traditional
4136 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4137 || (bitfield && ! flag_signed_bitfields
4138 && (explicit_int || defaulted_int || explicit_char
4139 /* A typedef for plain `int' without `signed'
4140 can be controlled just like plain `int'. */
4141 || ! (typedef_decl != 0
4142 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4143 && TREE_CODE (type) != ENUMERAL_TYPE
4144 && !(specbits & 1 << (int) RID_SIGNED)))
4147 type = long_long_unsigned_type_node;
4148 else if (specbits & 1 << (int) RID_LONG)
4149 type = long_unsigned_type_node;
4150 else if (specbits & 1 << (int) RID_SHORT)
4151 type = short_unsigned_type_node;
4152 else if (type == char_type_node)
4153 type = unsigned_char_type_node;
4154 else if (typedef_decl)
4155 type = unsigned_type (type);
4157 type = unsigned_type_node;
4159 else if ((specbits & 1 << (int) RID_SIGNED)
4160 && type == char_type_node)
4161 type = signed_char_type_node;
4163 type = long_long_integer_type_node;
4164 else if (specbits & 1 << (int) RID_LONG)
4165 type = long_integer_type_node;
4166 else if (specbits & 1 << (int) RID_SHORT)
4167 type = short_integer_type_node;
4169 if (specbits & 1 << (int) RID_COMPLEX)
4171 if (pedantic && !flag_isoc99)
4172 pedwarn ("ISO C89 does not support complex types");
4173 /* If we just have "complex", it is equivalent to
4174 "complex double", but if any modifiers at all are specified it is
4175 the complex form of TYPE. E.g, "complex short" is
4176 "complex short int". */
4178 if (defaulted_int && ! longlong
4179 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4180 | (1 << (int) RID_SIGNED)
4181 | (1 << (int) RID_UNSIGNED))))
4184 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4185 type = complex_double_type_node;
4187 else if (type == integer_type_node)
4190 pedwarn ("ISO C does not support complex integer types");
4191 type = complex_integer_type_node;
4193 else if (type == float_type_node)
4194 type = complex_float_type_node;
4195 else if (type == double_type_node)
4196 type = complex_double_type_node;
4197 else if (type == long_double_type_node)
4198 type = complex_long_double_type_node;
4202 pedwarn ("ISO C does not support complex integer types");
4203 type = build_complex_type (type);
4207 /* Figure out the type qualifiers for the declaration. There are
4208 two ways a declaration can become qualified. One is something
4209 like `const int i' where the `const' is explicit. Another is
4210 something like `typedef const int CI; CI i' where the type of the
4211 declaration contains the `const'. */
4212 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4213 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4214 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4215 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4216 if (constp > 1 && ! flag_isoc99)
4217 pedwarn ("duplicate `const'");
4218 if (restrictp > 1 && ! flag_isoc99)
4219 pedwarn ("duplicate `restrict'");
4220 if (volatilep > 1 && ! flag_isoc99)
4221 pedwarn ("duplicate `volatile'");
4222 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4223 type = TYPE_MAIN_VARIANT (type);
4224 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4225 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4226 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4228 /* Warn if two storage classes are given. Default to `auto'. */
4233 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4234 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4235 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4236 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4237 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4239 /* Warn about storage classes that are invalid for certain
4240 kinds of declarations (parameters, typenames, etc.). */
4243 error ("multiple storage classes in declaration of `%s'", name);
4244 else if (funcdef_flag
4246 & ((1 << (int) RID_REGISTER)
4247 | (1 << (int) RID_AUTO)
4248 | (1 << (int) RID_TYPEDEF))))
4250 if (specbits & 1 << (int) RID_AUTO
4251 && (pedantic || current_binding_level == global_binding_level))
4252 pedwarn ("function definition declared `auto'");
4253 if (specbits & 1 << (int) RID_REGISTER)
4254 error ("function definition declared `register'");
4255 if (specbits & 1 << (int) RID_TYPEDEF)
4256 error ("function definition declared `typedef'");
4257 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4258 | (1 << (int) RID_AUTO));
4260 else if (decl_context != NORMAL && nclasses > 0)
4262 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4266 switch (decl_context)
4269 error ("storage class specified for structure field `%s'",
4273 error ("storage class specified for parameter `%s'", name);
4276 error ("storage class specified for typename");
4279 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4280 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4281 | (1 << (int) RID_EXTERN));
4284 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4286 /* `extern' with initialization is invalid if not at top level. */
4287 if (current_binding_level == global_binding_level)
4288 warning ("`%s' initialized and declared `extern'", name);
4290 error ("`%s' has both `extern' and initializer", name);
4292 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4293 && current_binding_level != global_binding_level)
4294 error ("nested function `%s' declared `extern'", name);
4295 else if (current_binding_level == global_binding_level
4296 && specbits & (1 << (int) RID_AUTO))
4297 error ("top-level declaration of `%s' specifies `auto'", name);
4300 /* Now figure out the structure of the declarator proper.
4301 Descend through it, creating more complex types, until we reach
4302 the declared identifier (or NULL_TREE, in an absolute declarator). */
4304 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4306 if (type == error_mark_node)
4308 declarator = TREE_OPERAND (declarator, 0);
4312 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4313 an INDIRECT_REF (for *...),
4314 a CALL_EXPR (for ...(...)),
4315 a TREE_LIST (for nested attributes),
4316 an identifier (for the name being declared)
4317 or a null pointer (for the place in an absolute declarator
4318 where the name was omitted).
4319 For the last two cases, we have just exited the loop.
4321 At this point, TYPE is the type of elements of an array,
4322 or for a function to return, or for a pointer to point to.
4323 After this sequence of ifs, TYPE is the type of the
4324 array or function or pointer, and DECLARATOR has had its
4325 outermost layer removed. */
4327 if (array_ptr_quals != NULL_TREE || array_parm_static)
4329 /* Only the innermost declarator (making a parameter be of
4330 array type which is converted to pointer type)
4331 may have static or type qualifiers. */
4332 error ("static or type qualifiers in non-parameter array declarator");
4333 array_ptr_quals = NULL_TREE;
4334 array_parm_static = 0;
4337 if (TREE_CODE (declarator) == TREE_LIST)
4339 /* We encode a declarator with embedded attributes using
4341 tree attrs = TREE_PURPOSE (declarator);
4344 declarator = TREE_VALUE (declarator);
4345 inner_decl = declarator;
4346 while (inner_decl != NULL_TREE
4347 && TREE_CODE (inner_decl) == TREE_LIST)
4348 inner_decl = TREE_VALUE (inner_decl);
4349 if (inner_decl == NULL_TREE
4350 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4351 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4352 if (TREE_CODE (inner_decl) == CALL_EXPR)
4353 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4354 if (TREE_CODE (inner_decl) == ARRAY_REF)
4355 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4356 returned_attrs = decl_attributes (&type,
4357 chainon (returned_attrs, attrs),
4360 else if (TREE_CODE (declarator) == ARRAY_REF)
4362 register tree itype = NULL_TREE;
4363 register tree size = TREE_OPERAND (declarator, 1);
4364 /* The index is a signed object `sizetype' bits wide. */
4365 tree index_type = signed_type (sizetype);
4367 array_ptr_quals = TREE_TYPE (declarator);
4368 array_parm_static = TREE_STATIC (declarator);
4370 declarator = TREE_OPERAND (declarator, 0);
4372 /* Check for some types that there cannot be arrays of. */
4374 if (VOID_TYPE_P (type))
4376 error ("declaration of `%s' as array of voids", name);
4377 type = error_mark_node;
4380 if (TREE_CODE (type) == FUNCTION_TYPE)
4382 error ("declaration of `%s' as array of functions", name);
4383 type = error_mark_node;
4386 if (size == error_mark_node)
4387 type = error_mark_node;
4389 if (type == error_mark_node)
4392 /* If size was specified, set ITYPE to a range-type for that size.
4393 Otherwise, ITYPE remains null. finish_decl may figure it out
4394 from an initial value. */
4398 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4399 STRIP_TYPE_NOPS (size);
4401 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4403 error ("size of array `%s' has non-integer type", name);
4404 size = integer_one_node;
4407 if (pedantic && integer_zerop (size))
4408 pedwarn ("ISO C forbids zero-size array `%s'", name);
4410 if (TREE_CODE (size) == INTEGER_CST)
4412 constant_expression_warning (size);
4413 if (tree_int_cst_sgn (size) < 0)
4415 error ("size of array `%s' is negative", name);
4416 size = integer_one_node;
4421 /* Make sure the array size remains visibly nonconstant
4422 even if it is (eg) a const variable with known value. */
4427 if (TREE_CONSTANT (size))
4428 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4431 pedwarn ("ISO C89 forbids variable-size array `%s'",
4436 if (integer_zerop (size))
4438 /* A zero-length array cannot be represented with an
4439 unsigned index type, which is what we'll get with
4440 build_index_type. Create an open-ended range instead. */
4441 itype = build_range_type (sizetype, size, NULL_TREE);
4445 /* Compute the maximum valid index, that is, size - 1.
4446 Do the calculation in index_type, so that if it is
4447 a variable the computations will be done in the
4449 itype = fold (build (MINUS_EXPR, index_type,
4450 convert (index_type, size),
4451 convert (index_type, size_one_node)));
4453 /* If that overflowed, the array is too big.
4454 ??? While a size of INT_MAX+1 technically shouldn't
4455 cause an overflow (because we subtract 1), the overflow
4456 is recorded during the conversion to index_type, before
4457 the subtraction. Handling this case seems like an
4458 unnecessary complication. */
4459 if (TREE_OVERFLOW (itype))
4461 error ("size of array `%s' is too large", name);
4462 type = error_mark_node;
4467 itype = variable_size (itype);
4468 itype = build_index_type (itype);
4471 else if (decl_context == FIELD)
4473 /* ??? Need to check somewhere that this is a structure
4474 and not a union, that this field is last, and that
4475 this structure has at least one other named member. */
4477 if (pedantic && !flag_isoc99 && !in_system_header)
4478 pedwarn ("ISO C89 does not support flexible array members");
4480 /* ISO C99 Flexible array members are effectively identical
4481 to GCC's zero-length array extension. */
4482 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4485 /* If pedantic, complain about arrays of incomplete types. */
4487 if (pedantic && !COMPLETE_TYPE_P (type))
4488 pedwarn ("array type has incomplete element type");
4491 /* We shouldn't have a function type here at all!
4492 Functions aren't allowed as array elements. */
4493 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4494 && (constp || volatilep))
4495 pedwarn ("ANSI C forbids const or volatile function types");
4498 /* Build the array type itself, then merge any constancy or
4499 volatility into the target type. We must do it in this order
4500 to ensure that the TYPE_MAIN_VARIANT field of the array type
4501 is set correctly. */
4503 type = build_array_type (type, itype);
4505 type = c_build_qualified_type (type, type_quals);
4508 C_TYPE_VARIABLE_SIZE (type) = 1;
4510 /* The GCC extension for zero-length arrays differs from
4511 ISO flexible array members in that sizeof yields zero. */
4512 if (size && integer_zerop (size))
4515 TYPE_SIZE (type) = bitsize_zero_node;
4516 TYPE_SIZE_UNIT (type) = size_zero_node;
4518 if (decl_context != PARM
4519 && (array_ptr_quals != NULL_TREE || array_parm_static))
4521 error ("static or type qualifiers in non-parameter array declarator");
4522 array_ptr_quals = NULL_TREE;
4523 array_parm_static = 0;
4526 else if (TREE_CODE (declarator) == CALL_EXPR)
4530 /* Declaring a function type.
4531 Make sure we have a valid type for the function to return. */
4532 if (type == error_mark_node)
4537 /* Warn about some types functions can't return. */
4539 if (TREE_CODE (type) == FUNCTION_TYPE)
4541 error ("`%s' declared as function returning a function", name);
4542 type = integer_type_node;
4544 if (TREE_CODE (type) == ARRAY_TYPE)
4546 error ("`%s' declared as function returning an array", name);
4547 type = integer_type_node;
4550 #ifndef TRADITIONAL_RETURN_FLOAT
4551 /* Traditionally, declaring return type float means double. */
4553 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4554 type = double_type_node;
4555 #endif /* TRADITIONAL_RETURN_FLOAT */
4557 /* Construct the function type and go to the next
4558 inner layer of declarator. */
4560 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4562 /* Say it's a definition
4563 only for the CALL_EXPR
4564 closest to the identifier. */
4565 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4566 /* Type qualifiers before the return type of the function
4567 qualify the return type, not the function type. */
4570 /* Type qualifiers on a function return type are normally
4571 permitted by the standard but have no effect, so give a
4572 warning at -W. Qualifiers on a void return type have
4573 meaning as a GNU extension, and are banned on function
4574 definitions in ISO C. FIXME: strictly we shouldn't
4575 pedwarn for qualified void return types except on function
4576 definitions, but not doing so could lead to the undesirable
4577 state of a "volatile void" function return type not being
4578 warned about, and a use of the function being compiled
4579 with GNU semantics, with no diagnostics under -pedantic. */
4580 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4581 pedwarn ("ISO C forbids qualified void function return type");
4582 else if (extra_warnings
4583 && !(VOID_TYPE_P (type)
4584 && type_quals == TYPE_QUAL_VOLATILE))
4585 warning ("type qualifiers ignored on function return type");
4587 type = c_build_qualified_type (type, type_quals);
4589 type_quals = TYPE_UNQUALIFIED;
4591 type = build_function_type (type, arg_types);
4592 declarator = TREE_OPERAND (declarator, 0);
4594 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4595 the formal parameter list of this FUNCTION_TYPE to point to
4596 the FUNCTION_TYPE node itself. */
4601 for (link = last_function_parm_tags;
4603 link = TREE_CHAIN (link))
4604 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4607 else if (TREE_CODE (declarator) == INDIRECT_REF)
4609 /* Merge any constancy or volatility into the target type
4612 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4614 pedwarn ("ISO C forbids qualified function types");
4616 type = c_build_qualified_type (type, type_quals);
4617 type_quals = TYPE_UNQUALIFIED;
4620 type = build_pointer_type (type);
4622 /* Process a list of type modifier keywords
4623 (such as const or volatile) that were given inside the `*'. */
4625 if (TREE_TYPE (declarator))
4627 register tree typemodlist;
4633 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4634 typemodlist = TREE_CHAIN (typemodlist))
4636 tree qualifier = TREE_VALUE (typemodlist);
4638 if (C_IS_RESERVED_WORD (qualifier))
4640 if (C_RID_CODE (qualifier) == RID_CONST)
4642 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4644 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4654 error ("invalid type modifier within pointer declarator");
4655 if (constp > 1 && ! flag_isoc99)
4656 pedwarn ("duplicate `const'");
4657 if (volatilep > 1 && ! flag_isoc99)
4658 pedwarn ("duplicate `volatile'");
4659 if (restrictp > 1 && ! flag_isoc99)
4660 pedwarn ("duplicate `restrict'");
4662 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4663 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4664 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4667 declarator = TREE_OPERAND (declarator, 0);
4674 /* Now TYPE has the actual type. */
4676 /* Did array size calculations overflow? */
4678 if (TREE_CODE (type) == ARRAY_TYPE
4679 && COMPLETE_TYPE_P (type)
4680 && TREE_OVERFLOW (TYPE_SIZE (type)))
4682 error ("size of array `%s' is too large", name);
4683 /* If we proceed with the array type as it is, we'll eventully
4684 crash in tree_low_cst(). */
4685 type = error_mark_node;
4688 /* If this is declaring a typedef name, return a TYPE_DECL. */
4690 if (specbits & (1 << (int) RID_TYPEDEF))
4693 /* Note that the grammar rejects storage classes
4694 in typenames, fields or parameters */
4695 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4697 pedwarn ("ISO C forbids qualified function types");
4699 type = c_build_qualified_type (type, type_quals);
4700 decl = build_decl (TYPE_DECL, declarator, type);
4701 if ((specbits & (1 << (int) RID_SIGNED))
4702 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4703 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4704 decl_attributes (&decl, returned_attrs, 0);
4708 /* Detect the case of an array type of unspecified size
4709 which came, as such, direct from a typedef name.
4710 We must copy the type, so that each identifier gets
4711 a distinct type, so that each identifier's size can be
4712 controlled separately by its own initializer. */
4714 if (type != 0 && typedef_type != 0
4715 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4716 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4718 type = build_array_type (TREE_TYPE (type), 0);
4720 C_TYPE_VARIABLE_SIZE (type) = 1;
4723 /* If this is a type name (such as, in a cast or sizeof),
4724 compute the type and return it now. */
4726 if (decl_context == TYPENAME)
4728 /* Note that the grammar rejects storage classes
4729 in typenames, fields or parameters */
4730 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4732 pedwarn ("ISO C forbids const or volatile function types");
4734 type = c_build_qualified_type (type, type_quals);
4735 decl_attributes (&type, returned_attrs, 0);
4739 /* Aside from typedefs and type names (handle above),
4740 `void' at top level (not within pointer)
4741 is allowed only in public variables.
4742 We don't complain about parms either, but that is because
4743 a better error message can be made later. */
4745 if (VOID_TYPE_P (type) && decl_context != PARM
4746 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4747 && ((specbits & (1 << (int) RID_EXTERN))
4748 || (current_binding_level == global_binding_level
4750 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4752 error ("variable or field `%s' declared void", name);
4753 type = integer_type_node;
4756 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4757 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4762 if (decl_context == PARM)
4764 tree type_as_written;
4767 /* A parameter declared as an array of T is really a pointer to T.
4768 One declared as a function is really a pointer to a function. */
4770 if (TREE_CODE (type) == ARRAY_TYPE)
4772 /* Transfer const-ness of array into that of type pointed to. */
4773 type = TREE_TYPE (type);
4775 type = c_build_qualified_type (type, type_quals);
4776 type = build_pointer_type (type);
4777 type_quals = TYPE_UNQUALIFIED;
4778 if (array_ptr_quals)
4780 tree new_ptr_quals, new_ptr_attrs;
4782 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4783 /* We don't yet implement attributes in this context. */
4784 if (new_ptr_attrs != NULL_TREE)
4785 warning ("attributes in parameter array declarator ignored");
4790 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4792 tree qualifier = TREE_VALUE (new_ptr_quals);
4794 if (C_IS_RESERVED_WORD (qualifier))
4796 if (C_RID_CODE (qualifier) == RID_CONST)
4798 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4800 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4810 error ("invalid type modifier within array declarator");
4812 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4813 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4814 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4818 else if (TREE_CODE (type) == FUNCTION_TYPE)
4820 if (pedantic && type_quals)
4821 pedwarn ("ISO C forbids qualified function types");
4823 type = c_build_qualified_type (type, type_quals);
4824 type = build_pointer_type (type);
4825 type_quals = TYPE_UNQUALIFIED;
4827 else if (type_quals)
4828 type = c_build_qualified_type (type, type_quals);
4830 type_as_written = type;
4832 decl = build_decl (PARM_DECL, declarator, type);
4834 C_DECL_VARIABLE_SIZE (decl) = 1;
4836 /* Compute the type actually passed in the parmlist,
4837 for the case where there is no prototype.
4838 (For example, shorts and chars are passed as ints.)
4839 When there is a prototype, this is overridden later. */
4841 if (type == error_mark_node)
4842 promoted_type = type;
4845 promoted_type = simple_type_promotes_to (type);
4846 if (! promoted_type)
4847 promoted_type = type;
4850 DECL_ARG_TYPE (decl) = promoted_type;
4851 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4853 else if (decl_context == FIELD)
4855 /* Structure field. It may not be a function. */
4857 if (TREE_CODE (type) == FUNCTION_TYPE)
4859 error ("field `%s' declared as a function", name);
4860 type = build_pointer_type (type);
4862 else if (TREE_CODE (type) != ERROR_MARK
4863 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4865 error ("field `%s' has incomplete type", name);
4866 type = error_mark_node;
4868 /* Move type qualifiers down to element of an array. */
4869 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4871 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4873 TYPE_DOMAIN (type));
4875 /* Leave the field const or volatile as well. */
4876 type_quals = TYPE_UNQUALIFIED;
4879 decl = build_decl (FIELD_DECL, declarator, type);
4880 DECL_NONADDRESSABLE_P (decl) = bitfield;
4883 C_DECL_VARIABLE_SIZE (decl) = 1;
4885 else if (TREE_CODE (type) == FUNCTION_TYPE)
4887 /* Every function declaration is "external"
4888 except for those which are inside a function body
4889 in which `auto' is used.
4890 That is a case not specified by ANSI C,
4891 and we use it for forward declarations for nested functions. */
4892 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4893 || current_binding_level == global_binding_level);
4895 if (specbits & (1 << (int) RID_AUTO)
4896 && (pedantic || current_binding_level == global_binding_level))
4897 pedwarn ("invalid storage class for function `%s'", name);
4898 if (specbits & (1 << (int) RID_REGISTER))
4899 error ("invalid storage class for function `%s'", name);
4900 /* Function declaration not at top level.
4901 Storage classes other than `extern' are not allowed
4902 and `extern' makes no difference. */
4903 if (current_binding_level != global_binding_level
4904 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4906 pedwarn ("invalid storage class for function `%s'", name);
4908 decl = build_decl (FUNCTION_DECL, declarator, type);
4909 decl = build_decl_attribute_variant (decl, decl_attr);
4911 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4912 pedwarn ("ISO C forbids qualified function types");
4914 /* GNU C interprets a `volatile void' return type to indicate
4915 that the function does not return. */
4916 if ((type_quals & TYPE_QUAL_VOLATILE)
4917 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4918 warning ("`noreturn' function returns non-void value");
4921 DECL_EXTERNAL (decl) = 1;
4922 /* Record absence of global scope for `static' or `auto'. */
4924 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4926 /* Record presence of `inline', if it is reasonable. */
4929 if (MAIN_NAME_P (declarator))
4930 warning ("cannot inline function `main'");
4932 /* Assume that otherwise the function can be inlined. */
4933 DECL_INLINE (decl) = 1;
4935 if (specbits & (1 << (int) RID_EXTERN))
4936 current_extern_inline = 1;
4941 /* It's a variable. */
4942 /* An uninitialized decl with `extern' is a reference. */
4943 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4945 /* Move type qualifiers down to element of an array. */
4946 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4948 int saved_align = TYPE_ALIGN(type);
4949 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4951 TYPE_DOMAIN (type));
4952 TYPE_ALIGN (type) = saved_align;
4953 #if 0 /* Leave the variable const or volatile as well. */
4954 type_quals = TYPE_UNQUALIFIED;
4957 else if (type_quals)
4958 type = c_build_qualified_type (type, type_quals);
4960 decl = build_decl (VAR_DECL, declarator, type);
4962 C_DECL_VARIABLE_SIZE (decl) = 1;
4965 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4967 DECL_EXTERNAL (decl) = extern_ref;
4968 /* At top level, the presence of a `static' or `register' storage
4969 class specifier, or the absence of all storage class specifiers
4970 makes this declaration a definition (perhaps tentative). Also,
4971 the absence of both `static' and `register' makes it public. */
4972 if (current_binding_level == global_binding_level)
4976 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4977 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4979 /* Not at top level, only `static' makes a static definition. */
4982 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4983 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4987 /* Record `register' declaration for warnings on &
4988 and in case doing stupid register allocation. */
4990 if (specbits & (1 << (int) RID_REGISTER))
4991 DECL_REGISTER (decl) = 1;
4993 /* Record constancy and volatility. */
4994 c_apply_type_quals_to_decl (type_quals, decl);
4996 /* If a type has volatile components, it should be stored in memory.
4997 Otherwise, the fact that those components are volatile
4998 will be ignored, and would even crash the compiler. */
4999 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5000 mark_addressable (decl);
5002 decl_attributes (&decl, returned_attrs, 0);
5008 /* Decode the parameter-list info for a function type or function definition.
5009 The argument is the value returned by `get_parm_info' (or made in parse.y
5010 if there is an identifier list instead of a parameter decl list).
5011 These two functions are separate because when a function returns
5012 or receives functions then each is called multiple times but the order
5013 of calls is different. The last call to `grokparms' is always the one
5014 that contains the formal parameter names of a function definition.
5016 Store in `last_function_parms' a chain of the decls of parms.
5017 Also store in `last_function_parm_tags' a chain of the struct, union,
5018 and enum tags declared among the parms.
5020 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5022 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5023 a mere declaration. A nonempty identifier-list gets an error message
5024 when FUNCDEF_FLAG is zero. */
5027 grokparms (parms_info, funcdef_flag)
5031 tree first_parm = TREE_CHAIN (parms_info);
5033 last_function_parms = TREE_PURPOSE (parms_info);
5034 last_function_parm_tags = TREE_VALUE (parms_info);
5036 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5037 && !in_system_header)
5038 warning ("function declaration isn't a prototype");
5041 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5044 pedwarn ("parameter names (without types) in function declaration");
5046 last_function_parms = first_parm;
5053 /* We no longer test FUNCDEF_FLAG.
5054 If the arg types are incomplete in a declaration,
5055 they must include undefined tags.
5056 These tags can never be defined in the scope of the declaration,
5057 so the types can never be completed,
5058 and no call can be compiled successfully. */
5060 /* In a fcn definition, arg types must be complete. */
5063 for (parm = last_function_parms, typelt = first_parm;
5065 parm = TREE_CHAIN (parm))
5066 /* Skip over any enumeration constants declared here. */
5067 if (TREE_CODE (parm) == PARM_DECL)
5069 /* Barf if the parameter itself has an incomplete type. */
5070 tree type = TREE_VALUE (typelt);
5071 if (type == error_mark_node)
5073 if (!COMPLETE_TYPE_P (type))
5075 if (funcdef_flag && DECL_NAME (parm) != 0)
5076 error ("parameter `%s' has incomplete type",
5077 IDENTIFIER_POINTER (DECL_NAME (parm)));
5079 warning ("parameter has incomplete type");
5082 TREE_VALUE (typelt) = error_mark_node;
5083 TREE_TYPE (parm) = error_mark_node;
5087 /* This has been replaced by parm_tags_warning, which
5088 uses a more accurate criterion for what to warn
5092 /* Now warn if is a pointer to an incomplete type. */
5093 while (TREE_CODE (type) == POINTER_TYPE
5094 || TREE_CODE (type) == REFERENCE_TYPE)
5095 type = TREE_TYPE (type);
5096 type = TYPE_MAIN_VARIANT (type);
5097 if (!COMPLETE_TYPE_P (type))
5099 if (DECL_NAME (parm) != 0)
5100 warning ("parameter `%s' points to incomplete type",
5101 IDENTIFIER_POINTER (DECL_NAME (parm)));
5103 warning ("parameter points to incomplete type");
5107 typelt = TREE_CHAIN (typelt);
5114 /* Return a tree_list node with info on a parameter list just parsed.
5115 The TREE_PURPOSE is a chain of decls of those parms.
5116 The TREE_VALUE is a list of structure, union and enum tags defined.
5117 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5118 This tree_list node is later fed to `grokparms'.
5120 VOID_AT_END nonzero means append `void' to the end of the type-list.
5121 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5124 get_parm_info (void_at_end)
5127 register tree decl, t;
5128 register tree types = 0;
5130 tree tags = gettags ();
5131 tree parms = getdecls ();
5133 tree order = current_binding_level->parm_order;
5135 /* Just `void' (and no ellipsis) is special. There are really no parms.
5136 But if the `void' is qualified (by `const' or `volatile') or has a
5137 storage class specifier (`register'), then the behavior is undefined;
5138 by not counting it as the special case of `void' we will cause an
5139 error later. Typedefs for `void' are OK (see DR#157). */
5140 if (void_at_end && parms != 0
5141 && TREE_CHAIN (parms) == 0
5142 && VOID_TYPE_P (TREE_TYPE (parms))
5143 && ! TREE_THIS_VOLATILE (parms)
5144 && ! TREE_READONLY (parms)
5145 && ! DECL_REGISTER (parms)
5146 && DECL_NAME (parms) == 0)
5149 storedecls (NULL_TREE);
5150 return tree_cons (NULL_TREE, NULL_TREE,
5151 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5154 /* Extract enumerator values and other non-parms declared with the parms.
5155 Likewise any forward parm decls that didn't have real parm decls. */
5156 for (decl = parms; decl;)
5158 tree next = TREE_CHAIN (decl);
5160 if (TREE_CODE (decl) != PARM_DECL)
5162 TREE_CHAIN (decl) = new_parms;
5165 else if (TREE_ASM_WRITTEN (decl))
5167 error_with_decl (decl,
5168 "parameter `%s' has just a forward declaration");
5169 TREE_CHAIN (decl) = new_parms;
5175 /* Put the parm decls back in the order they were in in the parm list. */
5176 for (t = order; t; t = TREE_CHAIN (t))
5179 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5181 TREE_CHAIN (TREE_VALUE (t)) = 0;
5184 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5187 /* Store the parmlist in the binding level since the old one
5188 is no longer a valid list. (We have changed the chain pointers.) */
5189 storedecls (new_parms);
5191 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5192 /* There may also be declarations for enumerators if an enumeration
5193 type is declared among the parms. Ignore them here. */
5194 if (TREE_CODE (decl) == PARM_DECL)
5196 /* Since there is a prototype,
5197 args are passed in their declared types. */
5198 tree type = TREE_TYPE (decl);
5199 DECL_ARG_TYPE (decl) = type;
5200 if (PROMOTE_PROTOTYPES
5201 && INTEGRAL_TYPE_P (type)
5202 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5203 DECL_ARG_TYPE (decl) = integer_type_node;
5205 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5206 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5207 && DECL_NAME (decl) == 0)
5209 error ("`void' in parameter list must be the entire list");
5215 return tree_cons (new_parms, tags,
5216 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5218 return tree_cons (new_parms, tags, nreverse (types));
5221 /* At end of parameter list, warn about any struct, union or enum tags
5222 defined within. Do so because these types cannot ever become complete. */
5225 parmlist_tags_warning ()
5230 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5232 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5233 /* An anonymous union parm type is meaningful as a GNU extension.
5234 So don't warn for that. */
5235 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5237 if (TREE_PURPOSE (elt) != 0)
5238 warning ("`%s %s' declared inside parameter list",
5239 (code == RECORD_TYPE ? "struct"
5240 : code == UNION_TYPE ? "union"
5242 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5245 /* For translation these need to be seperate warnings */
5246 if (code == RECORD_TYPE)
5247 warning ("anonymous struct declared inside parameter list");
5248 else if (code == UNION_TYPE)
5249 warning ("anonymous union declared inside parameter list");
5251 warning ("anonymous enum declared inside parameter list");
5255 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5261 /* Get the struct, enum or union (CODE says which) with tag NAME.
5262 Define the tag as a forward-reference if it is not defined. */
5265 xref_tag (code, name)
5266 enum tree_code code;
5269 /* If a cross reference is requested, look up the type
5270 already defined for this tag and return it. */
5272 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5273 /* If this is the right type of tag, return what we found.
5274 (This reference will be shadowed by shadow_tag later if appropriate.)
5275 If this is the wrong type of tag, do not return it. If it was the
5276 wrong type in the same binding level, we will have had an error
5277 message already; if in a different binding level and declaring
5278 a name, pending_xref_error will give an error message; but if in a
5279 different binding level and not declaring a name, this tag should
5280 shadow the previous declaration of a different type of tag, and
5281 this would not work properly if we return the reference found.
5282 (For example, with "struct foo" in an outer scope, "union foo;"
5283 must shadow that tag with a new one of union type.) */
5284 if (ref && TREE_CODE (ref) == code)
5287 /* If no such tag is yet defined, create a forward-reference node
5288 and record it as the "definition".
5289 When a real declaration of this type is found,
5290 the forward-reference will be altered into a real type. */
5292 ref = make_node (code);
5293 if (code == ENUMERAL_TYPE)
5295 /* Give the type a default layout like unsigned int
5296 to avoid crashing if it does not get defined. */
5297 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5298 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5299 TYPE_USER_ALIGN (ref) = 0;
5300 TREE_UNSIGNED (ref) = 1;
5301 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5302 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5303 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5306 pushtag (name, ref);
5311 /* Make sure that the tag NAME is defined *in the current binding level*
5312 at least as a forward reference.
5313 CODE says which kind of tag NAME ought to be. */
5316 start_struct (code, name)
5317 enum tree_code code;
5320 /* If there is already a tag defined at this binding level
5321 (as a forward reference), just return it. */
5323 register tree ref = 0;
5326 ref = lookup_tag (code, name, current_binding_level, 1);
5327 if (ref && TREE_CODE (ref) == code)
5329 C_TYPE_BEING_DEFINED (ref) = 1;
5330 TYPE_PACKED (ref) = flag_pack_struct;
5331 if (TYPE_FIELDS (ref))
5332 error ("redefinition of `%s %s'",
5333 code == UNION_TYPE ? "union" : "struct",
5334 IDENTIFIER_POINTER (name));
5339 /* Otherwise create a forward-reference just so the tag is in scope. */
5341 ref = make_node (code);
5342 pushtag (name, ref);
5343 C_TYPE_BEING_DEFINED (ref) = 1;
5344 TYPE_PACKED (ref) = flag_pack_struct;
5348 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5349 of a structure component, returning a FIELD_DECL node.
5350 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5352 This is done during the parsing of the struct declaration.
5353 The FIELD_DECL nodes are chained together and the lot of them
5354 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5357 grokfield (filename, line, declarator, declspecs, width)
5358 const char *filename ATTRIBUTE_UNUSED;
5359 int line ATTRIBUTE_UNUSED;
5360 tree declarator, declspecs, width;
5364 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5366 finish_decl (value, NULL_TREE, NULL_TREE);
5367 DECL_INITIAL (value) = width;
5369 maybe_objc_check_decl (value);
5373 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5374 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5375 ATTRIBUTES are attributes to be applied to the structure. */
5378 finish_struct (t, fieldlist, attributes)
5384 int toplevel = global_binding_level == current_binding_level;
5385 int saw_named_field;
5387 /* If this type was previously laid out as a forward reference,
5388 make sure we lay it out again. */
5392 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5394 /* Nameless union parm types are useful as GCC extension. */
5395 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5396 /* Otherwise, warn about any struct or union def. in parmlist. */
5397 if (in_parm_level_p ())
5400 pedwarn ("%s defined inside parms",
5401 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5402 else if (! flag_traditional)
5403 warning ("%s defined inside parms",
5404 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5409 for (x = fieldlist; x; x = TREE_CHAIN (x))
5410 if (DECL_NAME (x) != 0)
5414 pedwarn ("%s has no %s",
5415 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5416 fieldlist ? _("named members") : _("members"));
5419 /* Install struct as DECL_CONTEXT of each field decl.
5420 Also process specified field sizes,m which is found in the DECL_INITIAL.
5421 Store 0 there, except for ": 0" fields (so we can find them
5422 and delete them, below). */
5424 saw_named_field = 0;
5425 for (x = fieldlist; x; x = TREE_CHAIN (x))
5427 DECL_CONTEXT (x) = t;
5428 DECL_PACKED (x) |= TYPE_PACKED (t);
5430 /* If any field is const, the structure type is pseudo-const. */
5431 if (TREE_READONLY (x))
5432 C_TYPE_FIELDS_READONLY (t) = 1;
5435 /* A field that is pseudo-const makes the structure likewise. */
5436 tree t1 = TREE_TYPE (x);
5437 while (TREE_CODE (t1) == ARRAY_TYPE)
5438 t1 = TREE_TYPE (t1);
5439 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5440 && C_TYPE_FIELDS_READONLY (t1))
5441 C_TYPE_FIELDS_READONLY (t) = 1;
5444 /* Any field that is volatile means variables of this type must be
5445 treated in some ways as volatile. */
5446 if (TREE_THIS_VOLATILE (x))
5447 C_TYPE_FIELDS_VOLATILE (t) = 1;
5449 /* Any field of nominal variable size implies structure is too. */
5450 if (C_DECL_VARIABLE_SIZE (x))
5451 C_TYPE_VARIABLE_SIZE (t) = 1;
5453 /* Detect invalid nested redefinition. */
5454 if (TREE_TYPE (x) == t)
5455 error ("nested redefinition of `%s'",
5456 IDENTIFIER_POINTER (TYPE_NAME (t)));
5458 /* Detect invalid bit-field size. */
5459 if (DECL_INITIAL (x))
5460 STRIP_NOPS (DECL_INITIAL (x));
5461 if (DECL_INITIAL (x))
5463 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5464 constant_expression_warning (DECL_INITIAL (x));
5468 "bit-field `%s' width not an integer constant");
5469 DECL_INITIAL (x) = NULL;
5473 /* Detect invalid bit-field type. */
5474 if (DECL_INITIAL (x)
5475 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5476 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5477 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5479 error_with_decl (x, "bit-field `%s' has invalid type");
5480 DECL_INITIAL (x) = NULL;
5483 if (DECL_INITIAL (x) && pedantic
5484 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5485 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5486 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5487 /* Accept an enum that's equivalent to int or unsigned int. */
5488 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5489 && (TYPE_PRECISION (TREE_TYPE (x))
5490 == TYPE_PRECISION (integer_type_node))))
5491 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5493 /* Detect and ignore out of range field width and process valid
5495 if (DECL_INITIAL (x))
5498 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5499 max_width = CHAR_TYPE_SIZE;
5501 max_width = TYPE_PRECISION (TREE_TYPE (x));
5502 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5503 error_with_decl (x, "negative width in bit-field `%s'");
5504 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5505 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5506 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5507 error_with_decl (x, "zero width for bit-field `%s'");
5510 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5511 unsigned HOST_WIDE_INT width
5512 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5514 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5515 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5516 TREE_UNSIGNED (TREE_TYPE (x)))
5518 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5519 TREE_UNSIGNED (TREE_TYPE (x))))))
5520 warning_with_decl (x,
5521 "`%s' is narrower than values of its type");
5523 DECL_SIZE (x) = bitsize_int (width);
5524 DECL_BIT_FIELD (x) = 1;
5525 SET_DECL_C_BIT_FIELD (x);
5529 /* field size 0 => force desired amount of alignment. */
5530 #ifdef EMPTY_FIELD_BOUNDARY
5531 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5533 #ifdef PCC_BITFIELD_TYPE_MATTERS
5534 if (PCC_BITFIELD_TYPE_MATTERS)
5536 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5537 TYPE_ALIGN (TREE_TYPE (x)));
5538 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5545 else if (TREE_TYPE (x) != error_mark_node)
5547 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5548 : TYPE_ALIGN (TREE_TYPE (x)));
5550 /* Non-bit-fields are aligned for their type, except packed
5551 fields which require only BITS_PER_UNIT alignment. */
5552 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5553 if (! DECL_PACKED (x))
5554 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5557 DECL_INITIAL (x) = 0;
5559 /* Detect flexible array member in an invalid context. */
5560 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5561 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5562 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5563 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5565 if (TREE_CODE (t) == UNION_TYPE)
5566 error_with_decl (x, "flexible array member in union");
5567 else if (TREE_CHAIN (x) != NULL_TREE)
5568 error_with_decl (x, "flexible array member not at end of struct");
5569 else if (! saw_named_field)
5570 error_with_decl (x, "flexible array member in otherwise empty struct");
5573 saw_named_field = 1;
5576 /* Delete all duplicate fields from the fieldlist */
5577 for (x = fieldlist; x && TREE_CHAIN (x);)
5578 /* Anonymous fields aren't duplicates. */
5579 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5583 register tree y = fieldlist;
5587 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5593 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5595 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5596 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5602 /* Now we have the nearly final fieldlist. Record it,
5603 then lay out the structure or union (including the fields). */
5605 TYPE_FIELDS (t) = fieldlist;
5609 /* Delete all zero-width bit-fields from the fieldlist */
5611 tree *fieldlistp = &fieldlist;
5613 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5614 *fieldlistp = TREE_CHAIN (*fieldlistp);
5616 fieldlistp = &TREE_CHAIN (*fieldlistp);
5619 /* Now we have the truly final field list.
5620 Store it in this type and in the variants. */
5622 TYPE_FIELDS (t) = fieldlist;
5624 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5626 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5627 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5628 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5629 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5632 /* If this was supposed to be a transparent union, but we can't
5633 make it one, warn and turn off the flag. */
5634 if (TREE_CODE (t) == UNION_TYPE
5635 && TYPE_TRANSPARENT_UNION (t)
5636 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5638 TYPE_TRANSPARENT_UNION (t) = 0;
5639 warning ("union cannot be made transparent");
5642 /* If this structure or union completes the type of any previous
5643 variable declaration, lay it out and output its rtl. */
5645 if (current_binding_level->n_incomplete != 0)
5648 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5650 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5651 && TREE_CODE (decl) != TYPE_DECL)
5653 layout_decl (decl, 0);
5654 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5655 maybe_objc_check_decl (decl);
5656 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5659 --current_binding_level->n_incomplete;
5661 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5662 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5664 tree element = TREE_TYPE (decl);
5665 while (TREE_CODE (element) == ARRAY_TYPE)
5666 element = TREE_TYPE (element);
5668 layout_array_type (TREE_TYPE (decl));
5673 /* Finish debugging output for this type. */
5674 rest_of_type_compilation (t, toplevel);
5679 /* Lay out the type T, and its element type, and so on. */
5682 layout_array_type (t)
5685 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5686 layout_array_type (TREE_TYPE (t));
5690 /* Begin compiling the definition of an enumeration type.
5691 NAME is its name (or null if anonymous).
5692 Returns the type object, as yet incomplete.
5693 Also records info about it so that build_enumerator
5694 may be used to declare the individual values as they are read. */
5700 register tree enumtype = 0;
5702 /* If this is the real definition for a previous forward reference,
5703 fill in the contents in the same object that used to be the
5704 forward reference. */
5707 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5709 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5711 enumtype = make_node (ENUMERAL_TYPE);
5712 pushtag (name, enumtype);
5715 C_TYPE_BEING_DEFINED (enumtype) = 1;
5717 if (TYPE_VALUES (enumtype) != 0)
5719 /* This enum is a named one that has been declared already. */
5720 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5722 /* Completely replace its old definition.
5723 The old enumerators remain defined, however. */
5724 TYPE_VALUES (enumtype) = 0;
5727 enum_next_value = integer_zero_node;
5730 if (flag_short_enums)
5731 TYPE_PACKED (enumtype) = 1;
5736 /* After processing and defining all the values of an enumeration type,
5737 install their decls in the enumeration type and finish it off.
5738 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5739 and ATTRIBUTES are the specified attributes.
5740 Returns ENUMTYPE. */
5743 finish_enum (enumtype, values, attributes)
5748 register tree pair, tem;
5749 tree minnode = 0, maxnode = 0, enum_value_type;
5750 int precision, unsign;
5751 int toplevel = (global_binding_level == current_binding_level);
5753 if (in_parm_level_p ())
5754 warning ("enum defined inside parms");
5756 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5758 /* Calculate the maximum value of any enumerator in this type. */
5760 if (values == error_mark_node)
5761 minnode = maxnode = integer_zero_node;
5764 minnode = maxnode = TREE_VALUE (values);
5765 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5767 tree value = TREE_VALUE (pair);
5768 if (tree_int_cst_lt (maxnode, value))
5770 if (tree_int_cst_lt (value, minnode))
5775 /* Construct the final type of this enumeration. It is the same
5776 as one of the integral types - the narrowest one that fits, except
5777 that normally we only go as narrow as int - and signed iff any of
5778 the values are negative. */
5779 unsign = (tree_int_cst_sgn (minnode) >= 0);
5780 precision = MAX (min_precision (minnode, unsign),
5781 min_precision (maxnode, unsign));
5782 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5784 tree narrowest = type_for_size (precision, unsign);
5787 warning ("enumeration values exceed range of largest integer");
5788 narrowest = long_long_integer_type_node;
5791 precision = TYPE_PRECISION (narrowest);
5794 precision = TYPE_PRECISION (integer_type_node);
5796 if (precision == TYPE_PRECISION (integer_type_node))
5797 enum_value_type = type_for_size (precision, 0);
5799 enum_value_type = enumtype;
5801 TYPE_MIN_VALUE (enumtype) = minnode;
5802 TYPE_MAX_VALUE (enumtype) = maxnode;
5803 TYPE_PRECISION (enumtype) = precision;
5804 TREE_UNSIGNED (enumtype) = unsign;
5805 TYPE_SIZE (enumtype) = 0;
5806 layout_type (enumtype);
5808 if (values != error_mark_node)
5810 /* Change the type of the enumerators to be the enum type. We
5811 need to do this irrespective of the size of the enum, for
5812 proper type checking. Replace the DECL_INITIALs of the
5813 enumerators, and the value slots of the list, with copies
5814 that have the enum type; they cannot be modified in place
5815 because they may be shared (e.g. integer_zero_node) Finally,
5816 change the purpose slots to point to the names of the decls. */
5817 for (pair = values; pair; pair = TREE_CHAIN (pair))
5819 tree enu = TREE_PURPOSE (pair);
5821 TREE_TYPE (enu) = enumtype;
5822 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5823 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5824 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5825 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5826 DECL_MODE (enu) = TYPE_MODE (enumtype);
5828 /* The ISO C Standard mandates enumerators to have type int,
5829 even though the underlying type of an enum type is
5830 unspecified. Here we convert any enumerators that fit in
5831 an int to type int, to avoid promotions to unsigned types
5832 when comparing integers with enumerators that fit in the
5833 int range. When -pedantic is given, build_enumerator()
5834 would have already taken care of those that don't fit. */
5835 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5836 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5838 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5840 TREE_PURPOSE (pair) = DECL_NAME (enu);
5841 TREE_VALUE (pair) = DECL_INITIAL (enu);
5844 TYPE_VALUES (enumtype) = values;
5847 /* Fix up all variant types of this enum type. */
5848 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5850 if (tem == enumtype)
5852 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5853 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5854 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5855 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5856 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5857 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5858 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5859 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5860 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5861 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5864 /* Finish debugging output for this type. */
5865 rest_of_type_compilation (enumtype, toplevel);
5870 /* Build and install a CONST_DECL for one value of the
5871 current enumeration type (one that was begun with start_enum).
5872 Return a tree-list containing the CONST_DECL and its value.
5873 Assignment of sequential values by default is handled here. */
5876 build_enumerator (name, value)
5879 register tree decl, type;
5881 /* Validate and default VALUE. */
5883 /* Remove no-op casts from the value. */
5885 STRIP_TYPE_NOPS (value);
5889 if (TREE_CODE (value) == INTEGER_CST)
5891 value = default_conversion (value);
5892 constant_expression_warning (value);
5896 error ("enumerator value for `%s' not integer constant",
5897 IDENTIFIER_POINTER (name));
5902 /* Default based on previous value. */
5903 /* It should no longer be possible to have NON_LVALUE_EXPR
5907 value = enum_next_value;
5909 error ("overflow in enumeration values");
5912 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5914 pedwarn ("ISO C restricts enumerator values to range of `int'");
5915 value = convert (integer_type_node, value);
5918 /* Set basis for default for next value. */
5919 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5920 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5922 /* Now create a declaration for the enum value name. */
5924 type = TREE_TYPE (value);
5925 type = type_for_size (MAX (TYPE_PRECISION (type),
5926 TYPE_PRECISION (integer_type_node)),
5928 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5929 && TREE_UNSIGNED (type)));
5931 decl = build_decl (CONST_DECL, name, type);
5932 DECL_INITIAL (decl) = convert (type, value);
5935 return tree_cons (decl, value, NULL_TREE);
5939 /* Create the FUNCTION_DECL for a function definition.
5940 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5941 the declaration; they describe the function's name and the type it returns,
5942 but twisted together in a fashion that parallels the syntax of C.
5944 This function creates a binding context for the function body
5945 as well as setting up the FUNCTION_DECL in current_function_decl.
5947 Returns 1 on success. If the DECLARATOR is not suitable for a function
5948 (it defines a datum instead), we return 0, which tells
5949 yyparse to report a parse error. */
5952 start_function (declspecs, declarator, attributes)
5953 tree declarator, declspecs, attributes;
5955 tree decl1, old_decl;
5957 int old_immediate_size_expand = immediate_size_expand;
5959 current_function_returns_value = 0; /* Assume, until we see it does. */
5960 current_function_returns_null = 0;
5961 warn_about_return_type = 0;
5962 current_extern_inline = 0;
5963 c_function_varargs = 0;
5965 shadowed_labels = 0;
5967 /* Don't expand any sizes in the return type of the function. */
5968 immediate_size_expand = 0;
5970 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5972 /* If the declarator is not suitable for a function definition,
5973 cause a syntax error. */
5976 immediate_size_expand = old_immediate_size_expand;
5980 decl_attributes (&decl1, attributes, 0);
5982 announce_function (decl1);
5984 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5986 error ("return type is an incomplete type");
5987 /* Make it return void instead. */
5989 = build_function_type (void_type_node,
5990 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5993 if (warn_about_return_type)
5994 pedwarn_c99 ("return type defaults to `int'");
5996 /* Save the parm names or decls from this function's declarator
5997 where store_parm_decls will find them. */
5998 current_function_parms = last_function_parms;
5999 current_function_parm_tags = last_function_parm_tags;
6001 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6002 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6003 DECL_INITIAL (decl1) = error_mark_node;
6005 /* If this definition isn't a prototype and we had a prototype declaration
6006 before, copy the arg type info from that prototype.
6007 But not if what we had before was a builtin function. */
6008 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6009 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6010 && !DECL_BUILT_IN (old_decl)
6011 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6012 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6013 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6015 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6016 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6017 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6020 /* If there is no explicit declaration, look for any out-of-scope implicit
6023 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6025 /* Optionally warn of old-fashioned def with no previous prototype. */
6026 if (warn_strict_prototypes
6027 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6029 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6030 || (DECL_BUILT_IN (old_decl)
6031 && ! C_DECL_ANTICIPATED (old_decl)))))
6032 warning ("function declaration isn't a prototype");
6033 /* Optionally warn of any global def with no previous prototype. */
6034 else if (warn_missing_prototypes
6035 && TREE_PUBLIC (decl1)
6037 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6038 || (DECL_BUILT_IN (old_decl)
6039 && ! C_DECL_ANTICIPATED (old_decl))))
6040 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6041 warning_with_decl (decl1, "no previous prototype for `%s'");
6042 /* Optionally warn of any def with no previous prototype
6043 if the function has already been used. */
6044 else if (warn_missing_prototypes
6045 && old_decl != 0 && TREE_USED (old_decl)
6046 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6047 warning_with_decl (decl1,
6048 "`%s' was used with no prototype before its definition");
6049 /* Optionally warn of any global def with no previous declaration. */
6050 else if (warn_missing_declarations
6051 && TREE_PUBLIC (decl1)
6053 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6054 warning_with_decl (decl1, "no previous declaration for `%s'");
6055 /* Optionally warn of any def with no previous declaration
6056 if the function has already been used. */
6057 else if (warn_missing_declarations
6058 && old_decl != 0 && TREE_USED (old_decl)
6059 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6060 warning_with_decl (decl1,
6061 "`%s' was used with no declaration before its definition");
6063 /* This is a definition, not a reference.
6064 So normally clear DECL_EXTERNAL.
6065 However, `extern inline' acts like a declaration
6066 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6067 DECL_EXTERNAL (decl1) = current_extern_inline;
6069 /* This function exists in static storage.
6070 (This does not mean `static' in the C sense!) */
6071 TREE_STATIC (decl1) = 1;
6073 /* A nested function is not global. */
6074 if (current_function_decl != 0)
6075 TREE_PUBLIC (decl1) = 0;
6077 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6078 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6083 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6084 != integer_type_node)
6085 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6087 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6088 args = TREE_CHAIN (args))
6090 tree type = args ? TREE_VALUE (args) : 0;
6092 if (type == void_type_node)
6099 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6100 pedwarn_with_decl (decl1,
6101 "first argument of `%s' should be `int'");
6105 if (TREE_CODE (type) != POINTER_TYPE
6106 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6107 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6109 pedwarn_with_decl (decl1,
6110 "second argument of `%s' should be `char **'");
6114 if (TREE_CODE (type) != POINTER_TYPE
6115 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6116 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6118 pedwarn_with_decl (decl1,
6119 "third argument of `%s' should probably be `char **'");
6124 /* It is intentional that this message does not mention the third
6125 argument because it's only mentioned in an appendix of the
6127 if (argct > 0 && (argct < 2 || argct > 3))
6128 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6130 if (! TREE_PUBLIC (decl1))
6131 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6134 /* Record the decl so that the function name is defined.
6135 If we already have a decl for this name, and it is a FUNCTION_DECL,
6136 use the old decl. */
6138 current_function_decl = pushdecl (decl1);
6141 declare_parm_level (1);
6142 current_binding_level->subblocks_tag_transparent = 1;
6144 make_decl_rtl (current_function_decl, NULL);
6146 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6147 /* Promote the value to int before returning it. */
6148 if (c_promoting_integer_type_p (restype))
6150 /* It retains unsignedness if traditional
6151 or if not really getting wider. */
6152 if (TREE_UNSIGNED (restype)
6153 && (flag_traditional
6154 || (TYPE_PRECISION (restype)
6155 == TYPE_PRECISION (integer_type_node))))
6156 restype = unsigned_type_node;
6158 restype = integer_type_node;
6160 DECL_RESULT (current_function_decl)
6161 = build_decl (RESULT_DECL, NULL_TREE, restype);
6163 /* If this fcn was already referenced via a block-scope `extern' decl
6164 (or an implicit decl), propagate certain information about the usage. */
6165 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6166 TREE_ADDRESSABLE (current_function_decl) = 1;
6168 immediate_size_expand = old_immediate_size_expand;
6170 start_fname_decls ();
6175 /* Record that this function is going to be a varargs function.
6176 This is called before store_parm_decls, which is too early
6177 to call mark_varargs directly. */
6182 c_function_varargs = 1;
6185 /* Store the parameter declarations into the current function declaration.
6186 This is called after parsing the parameter declarations, before
6187 digesting the body of the function.
6189 For an old-style definition, modify the function's type
6190 to specify at least the number of arguments. */
6195 register tree fndecl = current_function_decl;
6198 /* This is either a chain of PARM_DECLs (if a prototype was used)
6199 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6200 tree specparms = current_function_parms;
6202 /* This is a list of types declared among parms in a prototype. */
6203 tree parmtags = current_function_parm_tags;
6205 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6206 register tree parmdecls = getdecls ();
6208 /* This is a chain of any other decls that came in among the parm
6209 declarations. If a parm is declared with enum {foo, bar} x;
6210 then CONST_DECLs for foo and bar are put here. */
6213 /* Nonzero if this definition is written with a prototype. */
6216 /* The function containing FNDECL, if any. */
6217 tree context = decl_function_context (fndecl);
6219 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6221 /* This case is when the function was defined with an ANSI prototype.
6222 The parms already have decls, so we need not do anything here
6223 except record them as in effect
6224 and complain if any redundant old-style parm decls were written. */
6235 error_with_decl (fndecl,
6236 "parm types given both in parmlist and separately");
6237 /* Get rid of the erroneous decls; don't keep them on
6238 the list of parms, since they might not be PARM_DECLs. */
6239 for (decl = current_binding_level->names;
6240 decl; decl = TREE_CHAIN (decl))
6241 if (DECL_NAME (decl))
6242 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6243 for (link = current_binding_level->shadowed;
6244 link; link = TREE_CHAIN (link))
6245 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6246 current_binding_level->names = 0;
6247 current_binding_level->shadowed = 0;
6250 specparms = nreverse (specparms);
6251 for (parm = specparms; parm; parm = next)
6253 next = TREE_CHAIN (parm);
6254 if (TREE_CODE (parm) == PARM_DECL)
6256 if (DECL_NAME (parm) == 0)
6257 error_with_decl (parm, "parameter name omitted");
6258 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6259 && VOID_TYPE_P (TREE_TYPE (parm)))
6261 error_with_decl (parm, "parameter `%s' declared void");
6262 /* Change the type to error_mark_node so this parameter
6263 will be ignored by assign_parms. */
6264 TREE_TYPE (parm) = error_mark_node;
6270 /* If we find an enum constant or a type tag,
6271 put it aside for the moment. */
6272 TREE_CHAIN (parm) = 0;
6273 others = chainon (others, parm);
6277 /* Get the decls in their original chain order
6278 and record in the function. */
6279 DECL_ARGUMENTS (fndecl) = getdecls ();
6282 /* If this function takes a variable number of arguments,
6283 add a phony parameter to the end of the parm list,
6284 to represent the position of the first unnamed argument. */
6285 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6288 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6289 /* Let's hope the address of the unnamed parm
6290 won't depend on its type. */
6291 TREE_TYPE (dummy) = integer_type_node;
6292 DECL_ARG_TYPE (dummy) = integer_type_node;
6293 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6297 /* Now pushdecl the enum constants. */
6298 for (parm = others; parm; parm = next)
6300 next = TREE_CHAIN (parm);
6301 if (DECL_NAME (parm) == 0)
6303 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6305 else if (TREE_CODE (parm) != PARM_DECL)
6309 storetags (chainon (parmtags, gettags ()));
6313 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6314 each with a parm name as the TREE_VALUE.
6316 PARMDECLS is a chain of declarations for parameters.
6317 Warning! It can also contain CONST_DECLs which are not parameters
6318 but are names of enumerators of any enum types
6319 declared among the parameters.
6321 First match each formal parameter name with its declaration.
6322 Associate decls with the names and store the decls
6323 into the TREE_PURPOSE slots. */
6325 /* We use DECL_WEAK as a flag to show which parameters have been
6326 seen already since it is not used on PARM_DECL or CONST_DECL. */
6327 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6328 DECL_WEAK (parm) = 0;
6330 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6332 register tree tail, found = NULL;
6334 if (TREE_VALUE (parm) == 0)
6336 error_with_decl (fndecl,
6337 "parameter name missing from parameter list");
6338 TREE_PURPOSE (parm) = 0;
6342 /* See if any of the parmdecls specifies this parm by name.
6343 Ignore any enumerator decls. */
6344 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6345 if (DECL_NAME (tail) == TREE_VALUE (parm)
6346 && TREE_CODE (tail) == PARM_DECL)
6352 /* If declaration already marked, we have a duplicate name.
6353 Complain, and don't use this decl twice. */
6354 if (found && DECL_WEAK (found))
6356 error_with_decl (found, "multiple parameters named `%s'");
6360 /* If the declaration says "void", complain and ignore it. */
6361 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6363 error_with_decl (found, "parameter `%s' declared void");
6364 TREE_TYPE (found) = integer_type_node;
6365 DECL_ARG_TYPE (found) = integer_type_node;
6366 layout_decl (found, 0);
6369 /* Traditionally, a parm declared float is actually a double. */
6370 if (found && flag_traditional
6371 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6373 TREE_TYPE (found) = double_type_node;
6374 DECL_ARG_TYPE (found) = double_type_node;
6375 layout_decl (found, 0);
6378 /* If no declaration found, default to int. */
6381 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6383 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6384 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6385 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6387 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6388 else if (extra_warnings)
6389 warning_with_decl (found, "type of `%s' defaults to `int'");
6393 TREE_PURPOSE (parm) = found;
6395 /* Mark this decl as "already found". */
6396 DECL_WEAK (found) = 1;
6399 /* Put anything which is on the parmdecls chain and which is
6400 not a PARM_DECL onto the list NONPARMS. (The types of
6401 non-parm things which might appear on the list include
6402 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6403 any actual PARM_DECLs not matched with any names. */
6406 for (parm = parmdecls; parm;)
6408 tree next = TREE_CHAIN (parm);
6409 TREE_CHAIN (parm) = 0;
6411 if (TREE_CODE (parm) != PARM_DECL)
6412 nonparms = chainon (nonparms, parm);
6415 /* Complain about args with incomplete types. */
6416 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6418 error_with_decl (parm, "parameter `%s' has incomplete type");
6419 TREE_TYPE (parm) = error_mark_node;
6422 if (! DECL_WEAK (parm))
6424 error_with_decl (parm,
6425 "declaration for parameter `%s' but no such parameter");
6426 /* Pretend the parameter was not missing.
6427 This gets us to a standard state and minimizes
6428 further error messages. */
6430 = chainon (specparms,
6431 tree_cons (parm, NULL_TREE, NULL_TREE));
6438 /* Chain the declarations together in the order of the list of
6439 names. Store that chain in the function decl, replacing the
6442 DECL_ARGUMENTS (fndecl) = 0;
6445 for (last = 0; parm; parm = TREE_CHAIN (parm))
6446 if (TREE_PURPOSE (parm))
6449 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6451 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6452 last = TREE_PURPOSE (parm);
6453 TREE_CHAIN (last) = 0;
6457 /* If there was a previous prototype,
6458 set the DECL_ARG_TYPE of each argument according to
6459 the type previously specified, and report any mismatches. */
6461 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6464 for (parm = DECL_ARGUMENTS (fndecl),
6465 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6466 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6467 != void_type_node));
6468 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6470 if (parm == 0 || type == 0
6471 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6473 error ("number of arguments doesn't match prototype");
6474 error_with_file_and_line (current_function_prototype_file,
6475 current_function_prototype_line,
6476 "prototype declaration");
6479 /* Type for passing arg must be consistent with that
6480 declared for the arg. ISO C says we take the unqualified
6481 type for parameters declared with qualified type. */
6482 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6483 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6485 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6486 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6488 /* Adjust argument to match prototype. E.g. a previous
6489 `int foo(float);' prototype causes
6490 `int foo(x) float x; {...}' to be treated like
6491 `int foo(float x) {...}'. This is particularly
6492 useful for argument types like uid_t. */
6493 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6495 if (PROMOTE_PROTOTYPES
6496 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6497 && TYPE_PRECISION (TREE_TYPE (parm))
6498 < TYPE_PRECISION (integer_type_node))
6499 DECL_ARG_TYPE (parm) = integer_type_node;
6503 pedwarn ("promoted argument `%s' doesn't match prototype",
6504 IDENTIFIER_POINTER (DECL_NAME (parm)));
6505 warning_with_file_and_line
6506 (current_function_prototype_file,
6507 current_function_prototype_line,
6508 "prototype declaration");
6511 /* If -traditional, allow `int' argument to match
6512 `unsigned' prototype. */
6513 else if (! (flag_traditional
6514 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6515 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6517 error ("argument `%s' doesn't match prototype",
6518 IDENTIFIER_POINTER (DECL_NAME (parm)));
6519 error_with_file_and_line (current_function_prototype_file,
6520 current_function_prototype_line,
6521 "prototype declaration");
6525 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6528 /* Otherwise, create a prototype that would match. */
6532 tree actual = 0, last = 0, type;
6534 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6536 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6538 TREE_CHAIN (last) = type;
6543 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6545 TREE_CHAIN (last) = type;
6549 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6550 of the type of this function, but we need to avoid having this
6551 affect the types of other similarly-typed functions, so we must
6552 first force the generation of an identical (but separate) type
6553 node for the relevant function type. The new node we create
6554 will be a variant of the main variant of the original function
6557 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6559 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6562 /* Now store the final chain of decls for the arguments
6563 as the decl-chain of the current lexical scope.
6564 Put the enumerators in as well, at the front so that
6565 DECL_ARGUMENTS is not modified. */
6567 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6570 /* Make sure the binding level for the top of the function body
6571 gets a BLOCK if there are any in the function.
6572 Otherwise, the dbx output is wrong. */
6574 keep_next_if_subblocks = 1;
6576 /* ??? This might be an improvement,
6577 but needs to be thought about some more. */
6579 keep_next_level_flag = 1;
6582 /* Write a record describing this function definition to the prototypes
6583 file (if requested). */
6585 gen_aux_info_record (fndecl, 1, 0, prototype);
6587 /* Initialize the RTL code for the function. */
6588 init_function_start (fndecl, input_filename, lineno);
6590 /* Begin the statement tree for this function. */
6591 DECL_LANG_SPECIFIC (current_function_decl)
6592 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6593 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6595 /* If this is a nested function, save away the sizes of any
6596 variable-size types so that we can expand them when generating
6602 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6603 = nreverse (get_pending_sizes ());
6604 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6607 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6610 /* This function is being processed in whole-function mode. */
6611 cfun->x_whole_function_mode_p = 1;
6613 /* Even though we're inside a function body, we still don't want to
6614 call expand_expr to calculate the size of a variable-sized array.
6615 We haven't necessarily assigned RTL to all variables yet, so it's
6616 not safe to try to expand expressions involving them. */
6617 immediate_size_expand = 0;
6618 cfun->x_dont_save_pending_sizes_p = 1;
6621 /* Finish up a function declaration and compile that function
6622 all the way to assembler language output. The free the storage
6623 for the function definition.
6625 This is called after parsing the body of the function definition.
6627 NESTED is nonzero if the function being finished is nested in another. */
6630 finish_function (nested)
6633 register tree fndecl = current_function_decl;
6635 /* TREE_READONLY (fndecl) = 1;
6636 This caused &foo to be of type ptr-to-const-function
6637 which then got a warning when stored in a ptr-to-function variable. */
6640 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6642 /* Must mark the RESULT_DECL as being in this function. */
6644 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6646 /* Obey `register' declarations if `setjmp' is called in this fn. */
6647 if (flag_traditional && current_function_calls_setjmp)
6649 setjmp_protect (DECL_INITIAL (fndecl));
6650 setjmp_protect_args ();
6653 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6655 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6656 != integer_type_node)
6658 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6659 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6661 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6665 #ifdef DEFAULT_MAIN_RETURN
6666 /* Make it so that `main' always returns success by default. */
6667 DEFAULT_MAIN_RETURN;
6670 c_expand_return (integer_zero_node);
6675 finish_fname_decls ();
6677 /* Tie off the statement tree for this function. */
6678 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6679 /* Clear out memory we no longer need. */
6680 free_after_parsing (cfun);
6681 /* Since we never call rest_of_compilation, we never clear
6682 CFUN. Do so explicitly. */
6683 free_after_compilation (cfun);
6688 /* Generate RTL for the body of this function. */
6689 c_expand_body (fndecl, nested);
6690 /* Let the error reporting routines know that we're outside a
6691 function. For a nested function, this value is used in
6692 pop_c_function_context and then reset via pop_function_context. */
6693 current_function_decl = NULL;
6697 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6698 then we are already in the process of generating RTL for another
6702 c_expand_body (fndecl, nested_p)
6706 /* There's no reason to do any of the work here if we're only doing
6707 semantic analysis; this code just generates RTL. */
6708 if (flag_syntax_only)
6713 /* Make sure that we will evaluate variable-sized types involved
6714 in our function's type. */
6715 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6716 /* Squirrel away our current state. */
6717 push_function_context ();
6720 /* Initialize the RTL code for the function. */
6721 current_function_decl = fndecl;
6722 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6724 /* This function is being processed in whole-function mode. */
6725 cfun->x_whole_function_mode_p = 1;
6727 /* Even though we're inside a function body, we still don't want to
6728 call expand_expr to calculate the size of a variable-sized array.
6729 We haven't necessarily assigned RTL to all variables yet, so it's
6730 not safe to try to expand expressions involving them. */
6731 immediate_size_expand = 0;
6732 cfun->x_dont_save_pending_sizes_p = 1;
6734 /* If this is a varargs function, inform function.c. */
6735 if (c_function_varargs)
6738 /* Set up parameters and prepare for return, for the function. */
6739 expand_function_start (fndecl, 0);
6741 /* If this function is `main', emit a call to `__main'
6742 to run global initializers, etc. */
6743 if (DECL_NAME (fndecl)
6744 && MAIN_NAME_P (DECL_NAME (fndecl))
6745 && DECL_CONTEXT (fndecl) == NULL_TREE)
6746 expand_main_function ();
6748 /* Generate the RTL for this function. */
6749 expand_stmt (DECL_SAVED_TREE (fndecl));
6750 /* Allow the body of the function to be garbage collected. */
6751 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6753 /* We hard-wired immediate_size_expand to zero above.
6754 expand_function_end will decrement this variable. So, we set the
6755 variable to one here, so that after the decrement it will remain
6757 immediate_size_expand = 1;
6759 /* Allow language dialects to perform special processing. */
6760 if (lang_expand_function_end)
6761 (*lang_expand_function_end) ();
6763 /* Generate rtl for function exit. */
6764 expand_function_end (input_filename, lineno, 0);
6766 /* If this is a nested function, protect the local variables in the stack
6767 above us from being collected while we're compiling this function. */
6769 ggc_push_context ();
6771 /* Run the optimizers and output the assembler code for this function. */
6772 rest_of_compilation (fndecl);
6774 /* Undo the GC context switch. */
6778 /* With just -W, complain only if function returns both with
6779 and without a value. */
6781 && current_function_returns_value
6782 && current_function_returns_null)
6783 warning ("this function may return with or without a value");
6785 /* If requested, warn about function definitions where the function will
6786 return a value (usually of some struct or union type) which itself will
6787 take up a lot of stack space. */
6789 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6791 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6793 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6794 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6795 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6798 unsigned int size_as_int
6799 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6801 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6802 warning_with_decl (fndecl,
6803 "size of return value of `%s' is %u bytes",
6806 warning_with_decl (fndecl,
6807 "size of return value of `%s' is larger than %d bytes",
6812 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6814 /* Stop pointing to the local nodes about to be freed.
6815 But DECL_INITIAL must remain nonzero so we know this
6816 was an actual function definition.
6817 For a nested function, this is done in pop_c_function_context.
6818 If rest_of_compilation set this to 0, leave it 0. */
6819 if (DECL_INITIAL (fndecl) != 0)
6820 DECL_INITIAL (fndecl) = error_mark_node;
6822 DECL_ARGUMENTS (fndecl) = 0;
6825 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6827 if (targetm.have_ctors_dtors)
6828 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6829 DEFAULT_INIT_PRIORITY);
6831 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6834 if (DECL_STATIC_DESTRUCTOR (fndecl))
6836 if (targetm.have_ctors_dtors)
6837 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6838 DEFAULT_INIT_PRIORITY);
6840 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6844 /* Return to the enclosing function. */
6845 pop_function_context ();
6848 /* Check the declarations given in a for-loop for satisfying the C99
6851 check_for_loop_decls ()
6857 /* If we get here, declarations have been used in a for loop without
6858 the C99 for loop scope. This doesn't make much sense, so don't
6860 error ("`for' loop initial declaration used outside C99 mode");
6863 /* C99 subclause 6.8.5 paragraph 3:
6865 [#3] The declaration part of a for statement shall only
6866 declare identifiers for objects having storage class auto or
6869 It isn't clear whether, in this sentence, "identifiers" binds to
6870 "shall only declare" or to "objects" - that is, whether all identifiers
6871 declared must be identifiers for objects, or whether the restriction
6872 only applies to those that are. (A question on this in comp.std.c
6873 in November 2000 received no answer.) We implement the strictest
6874 interpretation, to avoid creating an extension which later causes
6877 for (t = gettags (); t; t = TREE_CHAIN (t))
6879 if (TREE_PURPOSE (t) != 0)
6880 error ("`%s %s' declared in `for' loop initial declaration",
6881 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6882 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6884 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6886 for (t = getdecls (); t; t = TREE_CHAIN (t))
6888 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6889 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6890 else if (TREE_STATIC (t))
6891 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6892 else if (DECL_EXTERNAL (t))
6893 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6897 /* Save and restore the variables in this file and elsewhere
6898 that keep track of the progress of compilation of the current function.
6899 Used for nested functions. */
6901 struct c_language_function
6903 struct language_function base;
6905 tree shadowed_labels;
6908 int warn_about_return_type;
6910 struct binding_level *binding_level;
6913 /* Save and reinitialize the variables
6914 used during compilation of a C function. */
6917 push_c_function_context (f)
6920 struct c_language_function *p;
6921 p = ((struct c_language_function *)
6922 xmalloc (sizeof (struct c_language_function)));
6923 f->language = (struct language_function *) p;
6925 p->base.x_stmt_tree = c_stmt_tree;
6926 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6927 p->named_labels = named_labels;
6928 p->shadowed_labels = shadowed_labels;
6929 p->returns_value = current_function_returns_value;
6930 p->returns_null = current_function_returns_null;
6931 p->warn_about_return_type = warn_about_return_type;
6932 p->extern_inline = current_extern_inline;
6933 p->binding_level = current_binding_level;
6936 /* Restore the variables used during compilation of a C function. */
6939 pop_c_function_context (f)
6942 struct c_language_function *p
6943 = (struct c_language_function *) f->language;
6946 /* Bring back all the labels that were shadowed. */
6947 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6948 if (DECL_NAME (TREE_VALUE (link)) != 0)
6949 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6950 = TREE_VALUE (link);
6952 if (DECL_SAVED_INSNS (current_function_decl) == 0
6953 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6955 /* Stop pointing to the local nodes about to be freed. */
6956 /* But DECL_INITIAL must remain nonzero so we know this
6957 was an actual function definition. */
6958 DECL_INITIAL (current_function_decl) = error_mark_node;
6959 DECL_ARGUMENTS (current_function_decl) = 0;
6962 c_stmt_tree = p->base.x_stmt_tree;
6963 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6964 named_labels = p->named_labels;
6965 shadowed_labels = p->shadowed_labels;
6966 current_function_returns_value = p->returns_value;
6967 current_function_returns_null = p->returns_null;
6968 warn_about_return_type = p->warn_about_return_type;
6969 current_extern_inline = p->extern_inline;
6970 current_binding_level = p->binding_level;
6976 /* Mark the language specific parts of F for GC. */
6979 mark_c_function_context (f)
6982 struct c_language_function *p
6983 = (struct c_language_function *) f->language;
6988 mark_c_language_function (&p->base);
6989 ggc_mark_tree (p->shadowed_labels);
6990 ggc_mark_tree (p->named_labels);
6991 mark_binding_level (&p->binding_level);
6994 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6997 copy_lang_decl (decl)
7000 struct lang_decl *ld;
7002 if (!DECL_LANG_SPECIFIC (decl))
7005 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7006 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7007 sizeof (struct lang_decl));
7008 DECL_LANG_SPECIFIC (decl) = ld;
7011 /* Mark the language specific bits in T for GC. */
7017 if (TREE_CODE (t) == IDENTIFIER_NODE)
7019 struct lang_identifier *i = (struct lang_identifier *) t;
7020 ggc_mark_tree (i->global_value);
7021 ggc_mark_tree (i->local_value);
7022 ggc_mark_tree (i->label_value);
7023 ggc_mark_tree (i->implicit_decl);
7024 ggc_mark_tree (i->error_locus);
7025 ggc_mark_tree (i->limbo_value);
7027 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7028 ggc_mark (TYPE_LANG_SPECIFIC (t));
7029 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7031 ggc_mark (DECL_LANG_SPECIFIC (t));
7032 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7033 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7037 /* The functions below are required for functionality of doing
7038 function at once processing in the C front end. Currently these
7039 functions are not called from anywhere in the C front end, but as
7040 these changes continue, that will change. */
7042 /* Returns non-zero if the current statement is a full expression,
7043 i.e. temporaries created during that statement should be destroyed
7044 at the end of the statement. */
7047 stmts_are_full_exprs_p ()
7052 /* Returns the stmt_tree (if any) to which statements are currently
7053 being added. If there is no active statement-tree, NULL is
7057 current_stmt_tree ()
7059 return &c_stmt_tree;
7062 /* Returns the stack of SCOPE_STMTs for the current function. */
7065 current_scope_stmt_stack ()
7067 return &c_scope_stmt_stack;
7070 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7074 anon_aggr_type_p (node)
7075 tree node ATTRIBUTE_UNUSED;
7080 /* Dummy function in place of callback used by C++. */
7083 extract_interface_info ()
7087 /* Return a new COMPOUND_STMT, after adding it to the current
7091 c_begin_compound_stmt ()
7095 /* Create the COMPOUND_STMT. */
7096 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7101 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7105 c_expand_decl_stmt (t)
7108 tree decl = DECL_STMT_DECL (t);
7110 /* Expand nested functions. */
7111 if (TREE_CODE (decl) == FUNCTION_DECL
7112 && DECL_CONTEXT (decl) == current_function_decl
7113 && DECL_SAVED_TREE (decl))
7114 c_expand_body (decl, /*nested_p=*/1);
7117 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7118 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7121 identifier_global_value (t)
7124 return IDENTIFIER_GLOBAL_VALUE (t);
7127 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7128 otherwise the name is found in ridpointers from RID_INDEX. */
7131 record_builtin_type (rid_index, name, type)
7138 id = ridpointers[(int) rid_index];
7140 id = get_identifier (name);
7141 pushdecl (build_decl (TYPE_DECL, id, type));
7144 /* Build the void_list_node (void_type_node having been created). */
7146 build_void_list_node ()
7148 tree t = build_tree_list (NULL_TREE, void_type_node);