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));
1501 trytype = build_type_attribute_variant (trytype,
1502 TYPE_ATTRIBUTES (oldtype));
1504 types_match = comptypes (newtype, trytype);
1508 /* Accept harmless mismatch in first argument type also.
1509 This is for the ffs and fprintf builtins. */
1510 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1511 && TYPE_ARG_TYPES (oldtype) != 0
1512 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1513 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1514 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1515 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1517 /* Function types may be shared, so we can't just modify
1518 the return type of olddecl's function type. */
1520 = build_function_type (TREE_TYPE (oldtype),
1521 tree_cons (NULL_TREE,
1522 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1523 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1524 trytype = build_type_attribute_variant (trytype,
1525 TYPE_ATTRIBUTES (oldtype));
1527 types_match = comptypes (newtype, trytype);
1531 if (! different_binding_level)
1532 TREE_TYPE (olddecl) = oldtype;
1536 /* If types don't match for a built-in, throw away the built-in. */
1537 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1541 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1542 && DECL_SOURCE_LINE (olddecl) == 0)
1544 /* A function declaration for a predeclared function
1545 that isn't actually built in. */
1546 if (!TREE_PUBLIC (newdecl))
1548 /* If you declare it as static, the
1549 default definition is overridden. */
1552 else if (!types_match)
1554 /* If the types don't match, preserve volatility indication.
1555 Later on, we will discard everything else about the
1556 default declaration. */
1557 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1560 /* Permit char *foo () to match void *foo (...) if not pedantic,
1561 if one of them came from a system header file. */
1562 else if (!types_match
1563 && TREE_CODE (olddecl) == FUNCTION_DECL
1564 && TREE_CODE (newdecl) == FUNCTION_DECL
1565 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1566 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1567 && (DECL_IN_SYSTEM_HEADER (olddecl)
1568 || DECL_IN_SYSTEM_HEADER (newdecl))
1569 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1570 && TYPE_ARG_TYPES (oldtype) == 0
1571 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1572 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1574 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1575 && TYPE_ARG_TYPES (newtype) == 0
1576 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1577 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1580 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1581 /* Make sure we keep void * as ret type, not char *. */
1582 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1583 TREE_TYPE (newdecl) = newtype = oldtype;
1585 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1586 we will come back here again. */
1587 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1589 else if (!types_match
1590 /* Permit char *foo (int, ...); followed by char *foo ();
1592 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1594 /* Return types must still match. */
1595 && comptypes (TREE_TYPE (oldtype),
1596 TREE_TYPE (newtype))
1597 && TYPE_ARG_TYPES (newtype) == 0))
1599 error_with_decl (newdecl, "conflicting types for `%s'");
1600 /* Check for function type mismatch
1601 involving an empty arglist vs a nonempty one. */
1602 if (TREE_CODE (olddecl) == FUNCTION_DECL
1603 && comptypes (TREE_TYPE (oldtype),
1604 TREE_TYPE (newtype))
1605 && ((TYPE_ARG_TYPES (oldtype) == 0
1606 && DECL_INITIAL (olddecl) == 0)
1608 (TYPE_ARG_TYPES (newtype) == 0
1609 && DECL_INITIAL (newdecl) == 0)))
1611 /* Classify the problem further. */
1612 register tree t = TYPE_ARG_TYPES (oldtype);
1614 t = TYPE_ARG_TYPES (newtype);
1615 for (; t; t = TREE_CHAIN (t))
1617 register tree type = TREE_VALUE (t);
1619 if (TREE_CHAIN (t) == 0
1620 && TYPE_MAIN_VARIANT (type) != void_type_node)
1622 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1626 if (simple_type_promotes_to (type) != NULL_TREE)
1628 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1633 error_with_decl (olddecl, "previous declaration of `%s'");
1637 errmsg = redeclaration_error_message (newdecl, olddecl);
1643 error_with_decl (newdecl, "redefinition of `%s'");
1646 error_with_decl (newdecl, "redeclaration of `%s'");
1649 error_with_decl (newdecl, "conflicting declarations of `%s'");
1655 error_with_decl (olddecl,
1656 ((DECL_INITIAL (olddecl)
1657 && current_binding_level == global_binding_level)
1658 ? "`%s' previously defined here"
1659 : "`%s' previously declared here"));
1661 else if (TREE_CODE (newdecl) == TYPE_DECL
1662 && (DECL_IN_SYSTEM_HEADER (olddecl)
1663 || DECL_IN_SYSTEM_HEADER (newdecl)))
1665 warning_with_decl (newdecl, "redefinition of `%s'");
1668 ((DECL_INITIAL (olddecl)
1669 && current_binding_level == global_binding_level)
1670 ? "`%s' previously defined here"
1671 : "`%s' previously declared here"));
1673 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1674 && DECL_INITIAL (olddecl) != 0
1675 && TYPE_ARG_TYPES (oldtype) == 0
1676 && TYPE_ARG_TYPES (newtype) != 0
1677 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1679 register tree type, parm;
1681 /* Prototype decl follows defn w/o prototype. */
1683 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1684 type = TYPE_ARG_TYPES (newtype),
1687 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1689 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1690 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1692 warning_with_decl (newdecl, "prototype for `%s' follows");
1693 warning_with_decl (olddecl, "non-prototype definition here");
1696 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1697 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1699 error_with_decl (newdecl,
1700 "prototype for `%s' follows and number of arguments doesn't match");
1701 error_with_decl (olddecl, "non-prototype definition here");
1705 /* Type for passing arg must be consistent
1706 with that declared for the arg. */
1707 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1708 /* If -traditional, allow `unsigned int' instead of `int'
1709 in the prototype. */
1710 && (! (flag_traditional
1711 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1712 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1714 error_with_decl (newdecl,
1715 "prototype for `%s' follows and argument %d doesn't match",
1717 error_with_decl (olddecl, "non-prototype definition here");
1723 /* Warn about mismatches in various flags. */
1726 /* Warn if function is now inline
1727 but was previously declared not inline and has been called. */
1728 if (TREE_CODE (olddecl) == FUNCTION_DECL
1729 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1730 && TREE_USED (olddecl))
1731 warning_with_decl (newdecl,
1732 "`%s' declared inline after being called");
1733 if (TREE_CODE (olddecl) == FUNCTION_DECL
1734 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1735 && DECL_INITIAL (olddecl) != 0)
1736 warning_with_decl (newdecl,
1737 "`%s' declared inline after its definition");
1739 /* If pedantic, warn when static declaration follows a non-static
1740 declaration. Otherwise, do so only for functions. */
1741 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1742 && TREE_PUBLIC (olddecl)
1743 && !TREE_PUBLIC (newdecl))
1744 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1746 /* If warn_traditional, warn when a non-static function
1747 declaration follows a static one. */
1748 if (warn_traditional && !in_system_header
1749 && TREE_CODE (olddecl) == FUNCTION_DECL
1750 && !TREE_PUBLIC (olddecl)
1751 && TREE_PUBLIC (newdecl))
1752 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1754 /* Warn when const declaration follows a non-const
1755 declaration, but not for functions. */
1756 if (TREE_CODE (olddecl) != FUNCTION_DECL
1757 && !TREE_READONLY (olddecl)
1758 && TREE_READONLY (newdecl))
1759 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1760 /* These bits are logically part of the type, for variables.
1761 But not for functions
1762 (where qualifiers are not valid ANSI anyway). */
1763 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1764 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1765 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1766 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1770 /* Optionally warn about more than one declaration for the same name. */
1771 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1772 /* Don't warn about a function declaration
1773 followed by a definition. */
1774 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1775 && DECL_INITIAL (olddecl) == 0)
1776 /* Don't warn about extern decl followed by (tentative) definition. */
1777 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1779 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1780 warning_with_decl (olddecl, "previous declaration of `%s'");
1783 /* Copy all the DECL_... slots specified in the new decl
1784 except for any that we copy here from the old type.
1786 Past this point, we don't change OLDTYPE and NEWTYPE
1787 even if we change the types of NEWDECL and OLDDECL. */
1791 /* When copying info to olddecl, we store into write_olddecl
1792 instead. This allows us to avoid modifying olddecl when
1793 different_binding_level is true. */
1794 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1796 /* Merge the data types specified in the two decls. */
1797 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1799 if (different_binding_level)
1801 if (TYPE_ARG_TYPES (oldtype) != 0
1802 && TYPE_ARG_TYPES (newtype) == 0)
1803 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1806 = build_type_attribute_variant
1808 merge_attributes (TYPE_ATTRIBUTES (newtype),
1809 TYPE_ATTRIBUTES (oldtype)));
1813 = TREE_TYPE (olddecl)
1814 = common_type (newtype, oldtype);
1817 /* Lay the type out, unless already done. */
1818 if (oldtype != TREE_TYPE (newdecl))
1820 if (TREE_TYPE (newdecl) != error_mark_node)
1821 layout_type (TREE_TYPE (newdecl));
1822 if (TREE_CODE (newdecl) != FUNCTION_DECL
1823 && TREE_CODE (newdecl) != TYPE_DECL
1824 && TREE_CODE (newdecl) != CONST_DECL)
1825 layout_decl (newdecl, 0);
1829 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1830 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1831 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1832 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1833 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1834 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1836 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1837 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1841 /* Keep the old rtl since we can safely use it. */
1842 COPY_DECL_RTL (olddecl, newdecl);
1844 /* Merge the type qualifiers. */
1845 if (TREE_CODE (olddecl) == FUNCTION_DECL
1846 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1847 && ! TREE_THIS_VOLATILE (newdecl))
1848 TREE_THIS_VOLATILE (write_olddecl) = 0;
1850 if (TREE_READONLY (newdecl))
1851 TREE_READONLY (write_olddecl) = 1;
1853 if (TREE_THIS_VOLATILE (newdecl))
1855 TREE_THIS_VOLATILE (write_olddecl) = 1;
1856 if (TREE_CODE (newdecl) == VAR_DECL
1857 /* If an automatic variable is re-declared in the same
1858 function scope, but the old declaration was not
1859 volatile, make_var_volatile() would crash because the
1860 variable would have been assigned to a pseudo, not a
1861 MEM. Since this duplicate declaration is invalid
1862 anyway, we just skip the call. */
1864 make_var_volatile (newdecl);
1867 /* Keep source location of definition rather than declaration. */
1868 /* When called with different_binding_level set, keep the old
1869 information so that meaningful diagnostics can be given. */
1870 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1871 && ! different_binding_level)
1873 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1874 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1877 /* Merge the unused-warning information. */
1878 if (DECL_IN_SYSTEM_HEADER (olddecl))
1879 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1880 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1881 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1883 /* Merge the initialization information. */
1884 /* When called with different_binding_level set, don't copy over
1885 DECL_INITIAL, so that we don't accidentally change function
1886 declarations into function definitions. */
1887 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1888 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1890 /* Merge the section attribute.
1891 We want to issue an error if the sections conflict but that must be
1892 done later in decl_attributes since we are called before attributes
1894 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1895 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1897 /* Copy the assembler name.
1898 Currently, it can only be defined in the prototype. */
1899 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1901 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1903 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1904 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1906 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1907 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1908 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1909 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1910 DECL_NO_LIMIT_STACK (newdecl)
1911 |= DECL_NO_LIMIT_STACK (olddecl);
1914 /* If cannot merge, then use the new type and qualifiers,
1915 and don't preserve the old rtl. */
1916 else if (! different_binding_level)
1918 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1919 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1920 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1921 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1924 /* Merge the storage class information. */
1925 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1926 /* For functions, static overrides non-static. */
1927 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1929 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1930 /* This is since we don't automatically
1931 copy the attributes of NEWDECL into OLDDECL. */
1932 /* No need to worry about different_binding_level here because
1933 then TREE_PUBLIC (newdecl) was true. */
1934 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1935 /* If this clears `static', clear it in the identifier too. */
1936 if (! TREE_PUBLIC (olddecl))
1937 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1939 if (DECL_EXTERNAL (newdecl))
1941 if (! different_binding_level)
1943 /* Don't mess with these flags on local externs; they remain
1944 external even if there's a declaration at file scope which
1946 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1947 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1949 /* An extern decl does not override previous storage class. */
1950 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1951 if (! DECL_EXTERNAL (newdecl))
1952 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1956 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1957 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1960 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1962 /* If we're redefining a function previously defined as extern
1963 inline, make sure we emit debug info for the inline before we
1964 throw it away, in case it was inlined into a function that hasn't
1965 been written out yet. */
1966 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1968 (*debug_hooks->outlining_inline_function) (olddecl);
1970 /* The new defn must not be inline. */
1971 DECL_INLINE (newdecl) = 0;
1972 DECL_UNINLINABLE (newdecl) = 1;
1976 /* If either decl says `inline', this fn is inline,
1977 unless its definition was passed already. */
1978 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1979 DECL_INLINE (olddecl) = 1;
1981 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1984 if (DECL_BUILT_IN (olddecl))
1986 /* Get rid of any built-in function if new arg types don't match it
1987 or if we have a function definition. */
1988 if (! types_match || new_is_definition)
1990 if (! different_binding_level)
1992 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1993 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1998 /* If redeclaring a builtin function, and not a definition,
1999 it stays built in. */
2000 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2001 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2004 /* Also preserve various other info from the definition. */
2005 else if (! new_is_definition)
2006 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2007 if (! new_is_definition)
2009 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2010 /* When called with different_binding_level set, don't copy over
2011 DECL_INITIAL, so that we don't accidentally change function
2012 declarations into function definitions. */
2013 if (! different_binding_level)
2014 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2015 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2016 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2017 if (DECL_INLINE (newdecl))
2018 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2021 if (different_binding_level)
2024 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2025 But preserve OLDDECL's DECL_UID. */
2027 register unsigned olddecl_uid = DECL_UID (olddecl);
2029 memcpy ((char *) olddecl + sizeof (struct tree_common),
2030 (char *) newdecl + sizeof (struct tree_common),
2031 sizeof (struct tree_decl) - sizeof (struct tree_common));
2032 DECL_UID (olddecl) = olddecl_uid;
2035 /* NEWDECL contains the merged attribute lists.
2036 Update OLDDECL to be the same. */
2037 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2042 /* Record a decl-node X as belonging to the current lexical scope.
2043 Check for errors (such as an incompatible declaration for the same
2044 name already seen in the same scope).
2046 Returns either X or an old decl for the same name.
2047 If an old decl is returned, it may have been smashed
2048 to agree with what X says. */
2055 register tree name = DECL_NAME (x);
2056 register struct binding_level *b = current_binding_level;
2058 DECL_CONTEXT (x) = current_function_decl;
2059 /* A local extern declaration for a function doesn't constitute nesting.
2060 A local auto declaration does, since it's a forward decl
2061 for a nested function coming later. */
2062 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2063 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2064 DECL_CONTEXT (x) = 0;
2066 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2067 && x != IDENTIFIER_IMPLICIT_DECL (name)
2068 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2069 && !DECL_IN_SYSTEM_HEADER (x))
2070 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2076 int different_binding_level = 0;
2078 t = lookup_name_current_level (name);
2079 /* Don't type check externs here when -traditional. This is so that
2080 code with conflicting declarations inside blocks will get warnings
2081 not errors. X11 for instance depends on this. */
2082 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2084 t = IDENTIFIER_GLOBAL_VALUE (name);
2085 /* Type decls at global scope don't conflict with externs declared
2086 inside lexical blocks. */
2087 if (t && TREE_CODE (t) == TYPE_DECL)
2089 different_binding_level = 1;
2091 if (t != 0 && t == error_mark_node)
2092 /* error_mark_node is 0 for a while during initialization! */
2095 error_with_decl (x, "`%s' used prior to declaration");
2100 file = DECL_SOURCE_FILE (t);
2101 line = DECL_SOURCE_LINE (t);
2104 /* If this decl is `static' and an implicit decl was seen previously,
2105 warn. But don't complain if -traditional,
2106 since traditional compilers don't complain. */
2107 if (! flag_traditional && TREE_PUBLIC (name)
2108 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2109 sets this for all functions. */
2110 && ! TREE_PUBLIC (x)
2111 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2112 /* We used to warn also for explicit extern followed by static,
2113 but sometimes you need to do it that way. */
2114 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2116 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2117 IDENTIFIER_POINTER (name));
2118 pedwarn_with_file_and_line
2119 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2120 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2121 "previous declaration of `%s'",
2122 IDENTIFIER_POINTER (name));
2123 TREE_THIS_VOLATILE (name) = 1;
2126 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2128 if (TREE_CODE (t) == PARM_DECL)
2130 /* Don't allow more than one "real" duplicate
2131 of a forward parm decl. */
2132 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2138 /* If we are processing a typedef statement, generate a whole new
2139 ..._TYPE node (which will be just an variant of the existing
2140 ..._TYPE node with identical properties) and then install the
2141 TYPE_DECL node generated to represent the typedef name as the
2142 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2144 The whole point here is to end up with a situation where each
2145 and every ..._TYPE node the compiler creates will be uniquely
2146 associated with AT MOST one node representing a typedef name.
2147 This way, even though the compiler substitutes corresponding
2148 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2149 early on, later parts of the compiler can always do the reverse
2150 translation and get back the corresponding typedef name. For
2153 typedef struct S MY_TYPE;
2156 Later parts of the compiler might only know that `object' was of
2157 type `struct S' if it were not for code just below. With this
2158 code however, later parts of the compiler see something like:
2160 struct S' == struct S
2161 typedef struct S' MY_TYPE;
2164 And they can then deduce (from the node for type struct S') that
2165 the original object declaration was:
2169 Being able to do this is important for proper support of protoize,
2170 and also for generating precise symbolic debugging information
2171 which takes full account of the programmer's (typedef) vocabulary.
2173 Obviously, we don't want to generate a duplicate ..._TYPE node if
2174 the TYPE_DECL node that we are now processing really represents a
2175 standard built-in type.
2177 Since all standard types are effectively declared at line zero
2178 in the source file, we can easily check to see if we are working
2179 on a standard type by checking the current value of lineno. */
2181 if (TREE_CODE (x) == TYPE_DECL)
2183 if (DECL_SOURCE_LINE (x) == 0)
2185 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2186 TYPE_NAME (TREE_TYPE (x)) = x;
2188 else if (TREE_TYPE (x) != error_mark_node
2189 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2191 tree tt = TREE_TYPE (x);
2192 DECL_ORIGINAL_TYPE (x) = tt;
2193 tt = build_type_copy (tt);
2195 TREE_USED (tt) = TREE_USED (x);
2200 /* Multiple external decls of the same identifier ought to match.
2201 Check against both global declarations (when traditional) and out of
2202 scope (limbo) block level declarations.
2204 We get warnings about inline functions where they are defined.
2205 Avoid duplicate warnings where they are used. */
2207 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2211 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2212 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2213 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2214 decl = IDENTIFIER_GLOBAL_VALUE (name);
2215 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2216 /* Decls in limbo are always extern, so no need to check that. */
2217 decl = IDENTIFIER_LIMBO_VALUE (name);
2221 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2222 /* If old decl is built-in, we already warned if we should. */
2223 && !DECL_BUILT_IN (decl))
2225 pedwarn_with_decl (x,
2226 "type mismatch with previous external decl");
2227 pedwarn_with_decl (decl, "previous external decl of `%s'");
2231 /* If a function has had an implicit declaration, and then is defined,
2232 make sure they are compatible. */
2234 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2235 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2236 && TREE_CODE (x) == FUNCTION_DECL
2237 && ! comptypes (TREE_TYPE (x),
2238 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2240 warning_with_decl (x, "type mismatch with previous implicit declaration");
2241 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2242 "previous implicit declaration of `%s'");
2245 /* In PCC-compatibility mode, extern decls of vars with no current decl
2246 take effect at top level no matter where they are. */
2247 if (flag_traditional && DECL_EXTERNAL (x)
2248 && lookup_name (name) == 0)
2250 tree type = TREE_TYPE (x);
2252 /* But don't do this if the type contains temporary nodes. */
2255 if (type == error_mark_node)
2257 if (TYPE_CONTEXT (type))
2259 warning_with_decl (x, "type of external `%s' is not global");
2260 /* By exiting the loop early, we leave TYPE nonzero,
2261 and thus prevent globalization of the decl. */
2264 else if (TREE_CODE (type) == FUNCTION_TYPE
2265 && TYPE_ARG_TYPES (type) != 0)
2266 /* The types might not be truly local,
2267 but the list of arg types certainly is temporary.
2268 Since prototypes are nontraditional,
2269 ok not to do the traditional thing. */
2271 type = TREE_TYPE (type);
2275 b = global_binding_level;
2278 /* This name is new in its binding level.
2279 Install the new declaration and return it. */
2280 if (b == global_binding_level)
2282 /* Install a global value. */
2284 /* If the first global decl has external linkage,
2285 warn if we later see static one. */
2286 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2287 TREE_PUBLIC (name) = 1;
2289 IDENTIFIER_GLOBAL_VALUE (name) = x;
2291 /* We no longer care about any previous block level declarations. */
2292 IDENTIFIER_LIMBO_VALUE (name) = 0;
2294 /* Don't forget if the function was used via an implicit decl. */
2295 if (IDENTIFIER_IMPLICIT_DECL (name)
2296 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2297 TREE_USED (x) = 1, TREE_USED (name) = 1;
2299 /* Don't forget if its address was taken in that way. */
2300 if (IDENTIFIER_IMPLICIT_DECL (name)
2301 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2302 TREE_ADDRESSABLE (x) = 1;
2304 /* Warn about mismatches against previous implicit decl. */
2305 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2306 /* If this real decl matches the implicit, don't complain. */
2307 && ! (TREE_CODE (x) == FUNCTION_DECL
2308 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2309 == integer_type_node)))
2310 pedwarn ("`%s' was previously implicitly declared to return `int'",
2311 IDENTIFIER_POINTER (name));
2313 /* If this decl is `static' and an `extern' was seen previously,
2314 that is erroneous. */
2315 if (TREE_PUBLIC (name)
2316 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2318 /* Okay to redeclare an ANSI built-in as static. */
2319 if (t != 0 && DECL_BUILT_IN (t))
2321 /* Okay to declare a non-ANSI built-in as anything. */
2322 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2324 /* Okay to have global type decl after an earlier extern
2325 declaration inside a lexical block. */
2326 else if (TREE_CODE (x) == TYPE_DECL)
2328 else if (IDENTIFIER_IMPLICIT_DECL (name))
2330 if (! TREE_THIS_VOLATILE (name))
2331 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2335 pedwarn ("`%s' was declared `extern' and later `static'",
2336 IDENTIFIER_POINTER (name));
2341 /* Here to install a non-global value. */
2342 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2343 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2345 IDENTIFIER_LOCAL_VALUE (name) = x;
2347 /* If this is an extern function declaration, see if we
2348 have a global definition or declaration for the function. */
2351 && TREE_CODE (x) == FUNCTION_DECL
2352 && TREE_CODE (oldglobal) == FUNCTION_DECL
2353 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2355 /* We have one. Their types must agree. */
2356 if (! comptypes (TREE_TYPE (x),
2357 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2358 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2361 /* Inner extern decl is inline if global one is.
2362 Copy enough to really inline it. */
2363 if (DECL_INLINE (oldglobal))
2365 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2366 DECL_INITIAL (x) = (current_function_decl == oldglobal
2367 ? 0 : DECL_INITIAL (oldglobal));
2368 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2369 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2370 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2371 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2372 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2373 DECL_ABSTRACT_ORIGIN (x)
2374 = DECL_ABSTRACT_ORIGIN (oldglobal);
2376 /* Inner extern decl is built-in if global one is. */
2377 if (DECL_BUILT_IN (oldglobal))
2379 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2380 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2382 /* Keep the arg types from a file-scope fcn defn. */
2383 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2384 && DECL_INITIAL (oldglobal)
2385 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2386 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2391 /* This case is probably sometimes the right thing to do. */
2392 /* If we have a local external declaration,
2393 then any file-scope declaration should not
2394 have been static. */
2395 if (oldlocal == 0 && oldglobal != 0
2396 && !TREE_PUBLIC (oldglobal)
2397 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2398 warning ("`%s' locally external but globally static",
2399 IDENTIFIER_POINTER (name));
2402 /* If we have a local external declaration,
2403 and no file-scope declaration has yet been seen,
2404 then if we later have a file-scope decl it must not be static. */
2406 && DECL_EXTERNAL (x)
2410 TREE_PUBLIC (name) = 1;
2412 /* Save this decl, so that we can do type checking against
2413 other decls after it falls out of scope.
2415 Only save it once. This prevents temporary decls created in
2416 expand_inline_function from being used here, since this
2417 will have been set when the inline function was parsed.
2418 It also helps give slightly better warnings. */
2419 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2420 IDENTIFIER_LIMBO_VALUE (name) = x;
2423 /* Warn if shadowing an argument at the top level of the body. */
2424 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2425 /* This warning doesn't apply to the parms of a nested fcn. */
2426 && ! current_binding_level->parm_flag
2427 /* Check that this is one level down from the parms. */
2428 && current_binding_level->level_chain->parm_flag
2429 /* Check that the decl being shadowed
2430 comes from the parm level, one level up. */
2431 && chain_member (oldlocal, current_binding_level->level_chain->names))
2433 if (TREE_CODE (oldlocal) == PARM_DECL)
2434 pedwarn ("declaration of `%s' shadows a parameter",
2435 IDENTIFIER_POINTER (name));
2437 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2438 IDENTIFIER_POINTER (name));
2441 /* Maybe warn if shadowing something else. */
2442 else if (warn_shadow && !DECL_EXTERNAL (x)
2443 /* No shadow warnings for internally generated vars. */
2444 && DECL_SOURCE_LINE (x) != 0
2445 /* No shadow warnings for vars made for inlining. */
2446 && ! DECL_FROM_INLINE (x))
2448 const char *id = IDENTIFIER_POINTER (name);
2450 if (TREE_CODE (x) == PARM_DECL
2451 && current_binding_level->level_chain->parm_flag)
2452 /* Don't warn about the parm names in function declarator
2453 within a function declarator.
2454 It would be nice to avoid warning in any function
2455 declarator in a declaration, as opposed to a definition,
2456 but there is no way to tell it's not a definition. */
2458 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2459 warning ("declaration of `%s' shadows a parameter", id);
2460 else if (oldlocal != 0)
2461 warning ("declaration of `%s' shadows previous local", id);
2462 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2463 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2464 warning ("declaration of `%s' shadows global declaration", id);
2467 /* If storing a local value, there may already be one (inherited).
2468 If so, record it for restoration when this binding level ends. */
2470 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2473 /* Keep count of variables in this level with incomplete type.
2474 If the input is erroneous, we can have error_mark in the type
2475 slot (e.g. "f(void a, ...)") - that doesn't count as an
2477 if (TREE_TYPE (x) != error_mark_node
2478 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2482 /* Put decls on list in reverse order.
2483 We will reverse them later if necessary. */
2484 TREE_CHAIN (x) = b->names;
2490 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2493 pushdecl_top_level (x)
2497 register struct binding_level *b = current_binding_level;
2499 current_binding_level = global_binding_level;
2501 current_binding_level = b;
2505 /* Generate an implicit declaration for identifier FUNCTIONID
2506 as a function of type int (). Print a warning if appropriate. */
2509 implicitly_declare (functionid)
2513 int traditional_warning = 0;
2514 /* Only one "implicit declaration" warning per identifier. */
2515 int implicit_warning;
2517 /* We used to reuse an old implicit decl here,
2518 but this loses with inline functions because it can clobber
2519 the saved decl chains. */
2521 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2522 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2525 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2527 /* Warn of implicit decl following explicit local extern decl.
2528 This is probably a program designed for traditional C. */
2529 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2530 traditional_warning = 1;
2532 /* Warn once of an implicit declaration. */
2533 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2535 DECL_EXTERNAL (decl) = 1;
2536 TREE_PUBLIC (decl) = 1;
2538 /* Record that we have an implicit decl and this is it. */
2539 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2541 /* ANSI standard says implicit declarations are in the innermost block.
2542 So we record the decl in the standard fashion.
2543 If flag_traditional is set, pushdecl does it top-level. */
2546 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2547 maybe_objc_check_decl (decl);
2549 rest_of_decl_compilation (decl, NULL, 0, 0);
2551 if (implicit_warning)
2552 implicit_decl_warning (functionid);
2553 else if (warn_traditional && traditional_warning)
2554 warning ("function `%s' was previously declared within a block",
2555 IDENTIFIER_POINTER (functionid));
2557 /* Write a record describing this implicit function declaration to the
2558 prototypes file (if requested). */
2560 gen_aux_info_record (decl, 0, 1, 0);
2562 /* Possibly apply some default attributes to this implicit declaration. */
2563 decl_attributes (&decl, NULL_TREE, 0);
2569 implicit_decl_warning (id)
2572 const char *name = IDENTIFIER_POINTER (id);
2573 if (mesg_implicit_function_declaration == 2)
2574 error ("implicit declaration of function `%s'", name);
2575 else if (mesg_implicit_function_declaration == 1)
2576 warning ("implicit declaration of function `%s'", name);
2579 /* Return zero if the declaration NEWDECL is valid
2580 when the declaration OLDDECL (assumed to be for the same name)
2581 has already been seen.
2582 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2583 and 3 if it is a conflicting declaration. */
2586 redeclaration_error_message (newdecl, olddecl)
2587 tree newdecl, olddecl;
2589 if (TREE_CODE (newdecl) == TYPE_DECL)
2591 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2593 /* pushdecl creates distinct types for TYPE_DECLs by calling
2594 build_type_copy, so the above comparison generally fails. We do
2595 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2596 is equivalent to what this code used to do before the build_type_copy
2597 call. The variant type distinction should not matter for traditional
2598 code, because it doesn't have type qualifiers. */
2599 if (flag_traditional
2600 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2602 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2606 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2608 /* Declarations of functions can insist on internal linkage
2609 but they can't be inconsistent with internal linkage,
2610 so there can be no error on that account.
2611 However defining the same name twice is no good. */
2612 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2613 /* However, defining once as extern inline and a second
2614 time in another way is ok. */
2615 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2616 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2620 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2622 /* Objects declared at top level: */
2623 /* If at least one is a reference, it's ok. */
2624 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2626 /* Reject two definitions. */
2627 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2629 /* Now we have two tentative defs, or one tentative and one real def. */
2630 /* Insist that the linkage match. */
2631 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2635 else if (current_binding_level->parm_flag
2636 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2640 /* Newdecl has block scope. If olddecl has block scope also, then
2641 reject two definitions, and reject a definition together with an
2642 external reference. Otherwise, it is OK, because newdecl must
2643 be an extern reference to olddecl. */
2644 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2645 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2651 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2652 Create one if none exists so far for the current function.
2653 This function is called for both label definitions and label references. */
2659 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2661 if (current_function_decl == 0)
2663 error ("label %s referenced outside of any function",
2664 IDENTIFIER_POINTER (id));
2668 /* Use a label already defined or ref'd with this name. */
2671 /* But not if it is inherited and wasn't declared to be inheritable. */
2672 if (DECL_CONTEXT (decl) != current_function_decl
2673 && ! C_DECLARED_LABEL_FLAG (decl))
2674 return shadow_label (id);
2678 decl = build_decl (LABEL_DECL, id, void_type_node);
2680 /* A label not explicitly declared must be local to where it's ref'd. */
2681 DECL_CONTEXT (decl) = current_function_decl;
2683 DECL_MODE (decl) = VOIDmode;
2685 /* Say where one reference is to the label,
2686 for the sake of the error if it is not defined. */
2687 DECL_SOURCE_LINE (decl) = lineno;
2688 DECL_SOURCE_FILE (decl) = input_filename;
2690 IDENTIFIER_LABEL_VALUE (id) = decl;
2692 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2697 /* Make a label named NAME in the current function,
2698 shadowing silently any that may be inherited from containing functions
2699 or containing scopes.
2701 Note that valid use, if the label being shadowed
2702 comes from another scope in the same function,
2703 requires calling declare_nonlocal_label right away. */
2709 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2715 /* Check to make sure that the label hasn't already been declared
2716 at this label scope */
2717 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2718 if (TREE_VALUE (dup) == decl)
2720 error ("duplicate label declaration `%s'",
2721 IDENTIFIER_POINTER (name));
2722 error_with_decl (TREE_VALUE (dup),
2723 "this is a previous declaration");
2724 /* Just use the previous declaration. */
2725 return lookup_label (name);
2728 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2729 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2732 return lookup_label (name);
2735 /* Define a label, specifying the location in the source file.
2736 Return the LABEL_DECL node for the label, if the definition is valid.
2737 Otherwise return 0. */
2740 define_label (filename, line, name)
2741 const char *filename;
2745 tree decl = lookup_label (name);
2747 /* If label with this name is known from an outer context, shadow it. */
2748 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2750 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2751 IDENTIFIER_LABEL_VALUE (name) = 0;
2752 decl = lookup_label (name);
2755 if (warn_traditional && !in_system_header && lookup_name (name))
2756 warning_with_file_and_line (filename, line,
2757 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2758 IDENTIFIER_POINTER (name));
2760 if (DECL_INITIAL (decl) != 0)
2762 error_with_file_and_line (filename, line, "duplicate label `%s'",
2763 IDENTIFIER_POINTER (name));
2768 /* Mark label as having been defined. */
2769 DECL_INITIAL (decl) = error_mark_node;
2770 /* Say where in the source. */
2771 DECL_SOURCE_FILE (decl) = filename;
2772 DECL_SOURCE_LINE (decl) = line;
2777 /* Return the list of declarations of the current level.
2778 Note that this list is in reverse order unless/until
2779 you nreverse it; and when you do nreverse it, you must
2780 store the result back using `storedecls' or you will lose. */
2785 return current_binding_level->names;
2788 /* Return the list of type-tags (for structs, etc) of the current level. */
2793 return current_binding_level->tags;
2796 /* Store the list of declarations of the current level.
2797 This is done for the parameter declarations of a function being defined,
2798 after they are modified in the light of any missing parameters. */
2804 current_binding_level->names = decls;
2807 /* Similarly, store the list of tags of the current level. */
2813 current_binding_level->tags = tags;
2816 /* Given NAME, an IDENTIFIER_NODE,
2817 return the structure (or union or enum) definition for that name.
2818 Searches binding levels from BINDING_LEVEL up to the global level.
2819 If THISLEVEL_ONLY is nonzero, searches only the specified context
2820 (but skips any tag-transparent contexts to find one that is
2821 meaningful for tags).
2822 CODE says which kind of type the caller wants;
2823 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2824 If the wrong kind of type is found, an error is reported. */
2827 lookup_tag (code, name, binding_level, thislevel_only)
2828 enum tree_code code;
2829 struct binding_level *binding_level;
2833 register struct binding_level *level;
2836 for (level = binding_level; level; level = level->level_chain)
2839 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2841 if (TREE_PURPOSE (tail) == name)
2843 if (TREE_CODE (TREE_VALUE (tail)) != code)
2845 /* Definition isn't the kind we were looking for. */
2846 pending_invalid_xref = name;
2847 pending_invalid_xref_file = input_filename;
2848 pending_invalid_xref_line = lineno;
2849 /* If in the same binding level as a declaration as a tag
2850 of a different type, this must not be allowed to
2851 shadow that tag, so give the error immediately.
2852 (For example, "struct foo; union foo;" is invalid.) */
2854 pending_xref_error ();
2856 return TREE_VALUE (tail);
2859 if (! level->tag_transparent)
2869 /* Print an error message now
2870 for a recent invalid struct, union or enum cross reference.
2871 We don't print them immediately because they are not invalid
2872 when used in the `struct foo;' construct for shadowing. */
2875 pending_xref_error ()
2877 if (pending_invalid_xref != 0)
2878 error_with_file_and_line (pending_invalid_xref_file,
2879 pending_invalid_xref_line,
2880 "`%s' defined as wrong kind of tag",
2881 IDENTIFIER_POINTER (pending_invalid_xref));
2882 pending_invalid_xref = 0;
2885 /* Given a type, find the tag that was defined for it and return the tag name.
2886 Otherwise return 0. */
2889 lookup_tag_reverse (type)
2892 register struct binding_level *level;
2894 for (level = current_binding_level; level; level = level->level_chain)
2897 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2899 if (TREE_VALUE (tail) == type)
2900 return TREE_PURPOSE (tail);
2906 /* Look up NAME in the current binding level and its superiors
2907 in the namespace of variables, functions and typedefs.
2908 Return a ..._DECL node of some kind representing its definition,
2909 or return 0 if it is undefined. */
2917 if (current_binding_level != global_binding_level
2918 && IDENTIFIER_LOCAL_VALUE (name))
2919 val = IDENTIFIER_LOCAL_VALUE (name);
2921 val = IDENTIFIER_GLOBAL_VALUE (name);
2925 /* Similar to `lookup_name' but look only at current binding level. */
2928 lookup_name_current_level (name)
2933 if (current_binding_level == global_binding_level)
2934 return IDENTIFIER_GLOBAL_VALUE (name);
2936 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2939 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2940 if (DECL_NAME (t) == name)
2946 /* Mark ARG for GC. */
2949 mark_binding_level (arg)
2952 struct binding_level *level = *(struct binding_level **) arg;
2954 for (; level != 0; level = level->level_chain)
2956 ggc_mark_tree (level->names);
2957 ggc_mark_tree (level->tags);
2958 ggc_mark_tree (level->shadowed);
2959 ggc_mark_tree (level->blocks);
2960 ggc_mark_tree (level->this_block);
2961 ggc_mark_tree (level->parm_order);
2965 /* Create the predefined scalar types of C,
2966 and some nodes representing standard constants (0, 1, (void *) 0).
2967 Initialize the global binding level.
2968 Make definitions for built-in primitive functions. */
2971 init_decl_processing ()
2973 register tree endlink;
2974 tree ptr_ftype_void, ptr_ftype_ptr;
2976 current_function_decl = NULL;
2977 named_labels = NULL;
2978 current_binding_level = NULL_BINDING_LEVEL;
2979 free_binding_level = NULL_BINDING_LEVEL;
2981 /* Make the binding_level structure for global names. */
2983 global_binding_level = current_binding_level;
2985 build_common_tree_nodes (flag_signed_char);
2987 c_common_nodes_and_builtins ();
2989 boolean_type_node = integer_type_node;
2990 boolean_true_node = integer_one_node;
2991 boolean_false_node = integer_zero_node;
2993 /* With GCC, C99's _Bool is always of size 1. */
2994 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2995 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2996 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2997 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2998 TYPE_PRECISION (c_bool_type_node) = 1;
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3001 c_bool_false_node = build_int_2 (0, 0);
3002 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3003 c_bool_true_node = build_int_2 (1, 0);
3004 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3006 endlink = void_list_node;
3007 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3009 = build_function_type (ptr_type_node,
3010 tree_cons (NULL_TREE, ptr_type_node, endlink));
3012 /* Types which are common to the fortran compiler and libf2c. When
3013 changing these, you also need to be concerned with f/com.h. */
3015 if (TYPE_PRECISION (float_type_node)
3016 == TYPE_PRECISION (long_integer_type_node))
3018 g77_integer_type_node = long_integer_type_node;
3019 g77_uinteger_type_node = long_unsigned_type_node;
3021 else if (TYPE_PRECISION (float_type_node)
3022 == TYPE_PRECISION (integer_type_node))
3024 g77_integer_type_node = integer_type_node;
3025 g77_uinteger_type_node = unsigned_type_node;
3028 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3030 if (g77_integer_type_node != NULL_TREE)
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3033 g77_integer_type_node));
3034 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3035 g77_uinteger_type_node));
3038 if (TYPE_PRECISION (float_type_node) * 2
3039 == TYPE_PRECISION (long_integer_type_node))
3041 g77_longint_type_node = long_integer_type_node;
3042 g77_ulongint_type_node = long_unsigned_type_node;
3044 else if (TYPE_PRECISION (float_type_node) * 2
3045 == TYPE_PRECISION (long_long_integer_type_node))
3047 g77_longint_type_node = long_long_integer_type_node;
3048 g77_ulongint_type_node = long_long_unsigned_type_node;
3051 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3053 if (g77_longint_type_node != NULL_TREE)
3055 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3056 g77_longint_type_node));
3057 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3058 g77_ulongint_type_node));
3061 pedantic_lvalues = pedantic;
3063 make_fname_decl = c_make_fname_decl;
3064 start_fname_decls ();
3066 incomplete_decl_finalize_hook = finish_incomplete_decl;
3068 /* Record our roots. */
3070 ggc_add_tree_root (c_global_trees, CTI_MAX);
3071 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3072 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3073 ggc_add_tree_root (&named_labels, 1);
3074 ggc_add_tree_root (&shadowed_labels, 1);
3075 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3076 mark_binding_level);
3077 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3078 mark_binding_level);
3079 ggc_add_tree_root (&static_ctors, 1);
3080 ggc_add_tree_root (&static_dtors, 1);
3083 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3084 decl, NAME is the initialization string and TYPE_DEP indicates whether
3085 NAME depended on the type of the function. As we don't yet implement
3086 delayed emission of static data, we mark the decl as emitted
3087 so it is not placed in the output. Anything using it must therefore pull
3088 out the STRING_CST initializer directly. This does mean that these names
3089 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3092 c_make_fname_decl (id, type_dep)
3096 const char *name = fname_as_string (type_dep);
3097 tree decl, type, init;
3098 size_t length = strlen (name);
3100 type = build_array_type
3101 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3102 build_index_type (size_int (length)));
3104 decl = build_decl (VAR_DECL, id, type);
3105 /* We don't push the decl, so have to set its context here. */
3106 DECL_CONTEXT (decl) = current_function_decl;
3108 TREE_STATIC (decl) = 1;
3109 TREE_READONLY (decl) = 1;
3110 DECL_ARTIFICIAL (decl) = 1;
3112 init = build_string (length + 1, name);
3113 TREE_TYPE (init) = type;
3114 DECL_INITIAL (decl) = init;
3116 TREE_USED (decl) = 1;
3118 finish_decl (decl, init, NULL_TREE);
3123 /* Return a definition for a builtin function named NAME and whose data type
3124 is TYPE. TYPE should be a function type with argument types.
3125 FUNCTION_CODE tells later passes how to compile calls to this function.
3126 See tree.h for its possible values.
3128 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3129 the name to be called if we can't opencode the function. */
3132 builtin_function (name, type, function_code, class, library_name)
3136 enum built_in_class class;
3137 const char *library_name;
3139 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3140 DECL_EXTERNAL (decl) = 1;
3141 TREE_PUBLIC (decl) = 1;
3142 /* If -traditional, permit redefining a builtin function any way you like.
3143 (Though really, if the program redefines these functions,
3144 it probably won't work right unless compiled with -fno-builtin.) */
3145 if (flag_traditional && name[0] != '_')
3146 DECL_BUILT_IN_NONANSI (decl) = 1;
3148 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3149 make_decl_rtl (decl, NULL);
3151 DECL_BUILT_IN_CLASS (decl) = class;
3152 DECL_FUNCTION_CODE (decl) = function_code;
3154 /* Warn if a function in the namespace for users
3155 is used without an occasion to consider it declared. */
3156 if (name[0] != '_' || name[1] != '_')
3157 C_DECL_ANTICIPATED (decl) = 1;
3159 /* Possibly apply some default attributes to this built-in function. */
3160 decl_attributes (&decl, NULL_TREE, 0);
3165 /* Apply default attributes to a function, if a system function with default
3169 insert_default_attributes (decl)
3172 if (!TREE_PUBLIC (decl))
3174 c_common_insert_default_attributes (decl);
3177 /* Called when a declaration is seen that contains no names to declare.
3178 If its type is a reference to a structure, union or enum inherited
3179 from a containing scope, shadow that tag name for the current scope
3180 with a forward reference.
3181 If its type defines a new named structure or union
3182 or defines an enum, it is valid but we need not do anything here.
3183 Otherwise, it is an error. */
3186 shadow_tag (declspecs)
3189 shadow_tag_warned (declspecs, 0);
3193 shadow_tag_warned (declspecs, warned)
3196 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3203 pending_invalid_xref = 0;
3205 /* Remove the attributes from declspecs, since they will confuse the
3207 split_specs_attrs (declspecs, &specs, &attrs);
3209 for (link = specs; link; link = TREE_CHAIN (link))
3211 register tree value = TREE_VALUE (link);
3212 register enum tree_code code = TREE_CODE (value);
3214 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3215 /* Used to test also that TYPE_SIZE (value) != 0.
3216 That caused warning for `struct foo;' at top level in the file. */
3218 register tree name = lookup_tag_reverse (value);
3225 if (warned != 1 && code != ENUMERAL_TYPE)
3226 /* Empty unnamed enum OK */
3228 pedwarn ("unnamed struct/union that defines no instances");
3234 t = lookup_tag (code, name, current_binding_level, 1);
3238 t = make_node (code);
3245 if (!warned && ! in_system_header)
3247 warning ("useless keyword or type name in empty declaration");
3254 error ("two types specified in one empty declaration");
3259 pedwarn ("empty declaration");
3263 /* Construct an array declarator. EXPR is the expression inside [], or
3264 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3265 to the pointer to which a parameter array is converted). STATIC_P is
3266 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3267 is non-zero is the array is [*], a VLA of unspecified length which is
3268 nevertheless a complete type (not currently implemented by GCC),
3269 zero otherwise. The declarator is constructed as an ARRAY_REF
3270 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3271 left of the [] (filled by in set_array_declarator_type) and operand 1
3272 is the expression inside; whose TREE_TYPE is the type qualifiers and
3273 which has TREE_STATIC set if "static" is used. */
3276 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3283 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3284 TREE_TYPE (decl) = quals;
3285 TREE_STATIC (decl) = (static_p ? 1 : 0);
3286 if (pedantic && !flag_isoc99)
3288 if (static_p || quals != NULL_TREE)
3289 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3291 pedwarn ("ISO C89 does not support `[*]' array declarators");
3294 warning ("GCC does not yet properly implement `[*]' array declarators");
3298 /* Set the type of an array declarator. DECL is the declarator, as
3299 constructed by build_array_declarator; TYPE is what appears on the left
3300 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3301 abstract declarator, zero otherwise; this is used to reject static and
3302 type qualifiers in abstract declarators, where they are not in the
3306 set_array_declarator_type (decl, type, abstract_p)
3311 TREE_OPERAND (decl, 0) = type;
3312 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3313 error ("static or type qualifiers in abstract declarator");
3317 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3320 groktypename (typename)
3323 if (TREE_CODE (typename) != TREE_LIST)
3325 return grokdeclarator (TREE_VALUE (typename),
3326 TREE_PURPOSE (typename),
3330 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3333 groktypename_in_parm_context (typename)
3336 if (TREE_CODE (typename) != TREE_LIST)
3338 return grokdeclarator (TREE_VALUE (typename),
3339 TREE_PURPOSE (typename),
3343 /* Decode a declarator in an ordinary declaration or data definition.
3344 This is called as soon as the type information and variable name
3345 have been parsed, before parsing the initializer if any.
3346 Here we create the ..._DECL node, fill in its type,
3347 and put it on the list of decls for the current context.
3348 The ..._DECL node is returned as the value.
3350 Exception: for arrays where the length is not specified,
3351 the type is left null, to be filled in by `finish_decl'.
3353 Function definitions do not come here; they go to start_function
3354 instead. However, external and forward declarations of functions
3355 do go through here. Structure field declarations are done by
3356 grokfield and not through here. */
3359 start_decl (declarator, declspecs, initialized, attributes)
3360 tree declarator, declspecs;
3364 tree decl = grokdeclarator (declarator, declspecs,
3365 NORMAL, initialized);
3368 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3369 && MAIN_NAME_P (DECL_NAME (decl)))
3370 warning_with_decl (decl, "`%s' is usually a function");
3373 /* Is it valid for this decl to have an initializer at all?
3374 If not, set INITIALIZED to zero, which will indirectly
3375 tell `finish_decl' to ignore the initializer once it is parsed. */
3376 switch (TREE_CODE (decl))
3379 /* typedef foo = bar means give foo the same type as bar.
3380 We haven't parsed bar yet, so `finish_decl' will fix that up.
3381 Any other case of an initialization in a TYPE_DECL is an error. */
3382 if (pedantic || list_length (declspecs) > 1)
3384 error ("typedef `%s' is initialized",
3385 IDENTIFIER_POINTER (DECL_NAME (decl)));
3391 error ("function `%s' is initialized like a variable",
3392 IDENTIFIER_POINTER (DECL_NAME (decl)));
3397 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3398 error ("parameter `%s' is initialized",
3399 IDENTIFIER_POINTER (DECL_NAME (decl)));
3404 /* Don't allow initializations for incomplete types
3405 except for arrays which might be completed by the initialization. */
3407 /* This can happen if the array size is an undefined macro. We already
3408 gave a warning, so we don't need another one. */
3409 if (TREE_TYPE (decl) == error_mark_node)
3411 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3413 /* A complete type is ok if size is fixed. */
3415 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3416 || C_DECL_VARIABLE_SIZE (decl))
3418 error ("variable-sized object may not be initialized");
3422 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3424 error ("variable `%s' has initializer but incomplete type",
3425 IDENTIFIER_POINTER (DECL_NAME (decl)));
3428 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3430 error ("elements of array `%s' have incomplete type",
3431 IDENTIFIER_POINTER (DECL_NAME (decl)));
3439 /* Seems redundant with grokdeclarator. */
3440 if (current_binding_level != global_binding_level
3441 && DECL_EXTERNAL (decl)
3442 && TREE_CODE (decl) != FUNCTION_DECL)
3443 warning ("declaration of `%s' has `extern' and is initialized",
3444 IDENTIFIER_POINTER (DECL_NAME (decl)));
3446 DECL_EXTERNAL (decl) = 0;
3447 if (current_binding_level == global_binding_level)
3448 TREE_STATIC (decl) = 1;
3450 /* Tell `pushdecl' this is an initialized decl
3451 even though we don't yet have the initializer expression.
3452 Also tell `finish_decl' it may store the real initializer. */
3453 DECL_INITIAL (decl) = error_mark_node;
3456 /* If this is a function declaration, write a record describing it to the
3457 prototypes file (if requested). */
3459 if (TREE_CODE (decl) == FUNCTION_DECL)
3460 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3462 /* ANSI specifies that a tentative definition which is not merged with
3463 a non-tentative definition behaves exactly like a definition with an
3464 initializer equal to zero. (Section 3.7.2)
3465 -fno-common gives strict ANSI behavior. Usually you don't want it.
3466 This matters only for variables with external linkage. */
3467 if (! flag_no_common || ! TREE_PUBLIC (decl))
3468 DECL_COMMON (decl) = 1;
3470 /* Set attributes here so if duplicate decl, will have proper attributes. */
3471 decl_attributes (&decl, attributes, 0);
3473 /* Add this decl to the current binding level.
3474 TEM may equal DECL or it may be a previous decl of the same name. */
3475 tem = pushdecl (decl);
3477 /* For a local variable, define the RTL now. */
3478 if (current_binding_level != global_binding_level
3479 /* But not if this is a duplicate decl
3480 and we preserved the rtl from the previous one
3481 (which may or may not happen). */
3482 && !DECL_RTL_SET_P (tem)
3483 && !DECL_CONTEXT (tem))
3485 if (TREE_TYPE (tem) != error_mark_node
3486 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3488 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3489 && DECL_INITIAL (tem) != 0)
3496 /* Finish processing of a declaration;
3497 install its initial value.
3498 If the length of an array type is not known before,
3499 it must be determined now, from the initial value, or it is an error. */
3502 finish_decl (decl, init, asmspec_tree)
3506 register tree type = TREE_TYPE (decl);
3507 int was_incomplete = (DECL_SIZE (decl) == 0);
3508 const char *asmspec = 0;
3510 /* If a name was specified, get the string. */
3512 asmspec = TREE_STRING_POINTER (asmspec_tree);
3514 /* If `start_decl' didn't like having an initialization, ignore it now. */
3515 if (init != 0 && DECL_INITIAL (decl) == 0)
3518 /* Don't crash if parm is initialized. */
3519 if (TREE_CODE (decl) == PARM_DECL)
3524 if (TREE_CODE (decl) != TYPE_DECL)
3525 store_init_value (decl, init);
3528 /* typedef foo = bar; store the type of bar as the type of foo. */
3529 TREE_TYPE (decl) = TREE_TYPE (init);
3530 DECL_INITIAL (decl) = init = 0;
3534 /* Deduce size of array from initialization, if not already known */
3535 if (TREE_CODE (type) == ARRAY_TYPE
3536 && TYPE_DOMAIN (type) == 0
3537 && TREE_CODE (decl) != TYPE_DECL)
3540 = (TREE_STATIC (decl)
3541 /* Even if pedantic, an external linkage array
3542 may have incomplete type at first. */
3543 ? pedantic && !TREE_PUBLIC (decl)
3544 : !DECL_EXTERNAL (decl));
3546 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3548 /* Get the completed type made by complete_array_type. */
3549 type = TREE_TYPE (decl);
3552 error_with_decl (decl, "initializer fails to determine size of `%s'");
3554 else if (failure == 2)
3557 error_with_decl (decl, "array size missing in `%s'");
3558 /* If a `static' var's size isn't known,
3559 make it extern as well as static, so it does not get
3561 If it is not `static', then do not mark extern;
3562 finish_incomplete_decl will give it a default size
3563 and it will get allocated. */
3564 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3565 DECL_EXTERNAL (decl) = 1;
3568 /* TYPE_MAX_VALUE is always one less than the number of elements
3569 in the array, because we start counting at zero. Therefore,
3570 warn only if the value is less than zero. */
3571 else if (pedantic && TYPE_DOMAIN (type) != 0
3572 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3573 error_with_decl (decl, "zero or negative size array `%s'");
3575 layout_decl (decl, 0);
3578 if (TREE_CODE (decl) == VAR_DECL)
3580 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3581 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3582 layout_decl (decl, 0);
3584 if (DECL_SIZE (decl) == 0
3585 /* Don't give an error if we already gave one earlier. */
3586 && TREE_TYPE (decl) != error_mark_node
3587 && (TREE_STATIC (decl)
3589 /* A static variable with an incomplete type
3590 is an error if it is initialized.
3591 Also if it is not file scope.
3592 Otherwise, let it through, but if it is not `extern'
3593 then it may cause an error message later. */
3594 (DECL_INITIAL (decl) != 0
3595 || DECL_CONTEXT (decl) != 0)
3597 /* An automatic variable with an incomplete type
3599 !DECL_EXTERNAL (decl)))
3601 error_with_decl (decl, "storage size of `%s' isn't known");
3602 TREE_TYPE (decl) = error_mark_node;
3605 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3606 && DECL_SIZE (decl) != 0)
3608 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3609 constant_expression_warning (DECL_SIZE (decl));
3611 error_with_decl (decl, "storage size of `%s' isn't constant");
3614 if (TREE_USED (type))
3615 TREE_USED (decl) = 1;
3618 /* If this is a function and an assembler name is specified, it isn't
3619 builtin any more. Also reset DECL_RTL so we can give it its new
3621 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3623 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3624 SET_DECL_RTL (decl, NULL_RTX);
3625 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3628 /* Output the assembler code and/or RTL code for variables and functions,
3629 unless the type is an undefined structure or union.
3630 If not, it will get done when the type is completed. */
3632 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3634 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3635 maybe_objc_check_decl (decl);
3637 if (!DECL_CONTEXT (decl))
3639 if (DECL_INITIAL (decl) == NULL_TREE
3640 || DECL_INITIAL (decl) == error_mark_node)
3641 /* Don't output anything
3642 when a tentative file-scope definition is seen.
3643 But at end of compilation, do output code for them. */
3644 DECL_DEFER_OUTPUT (decl) = 1;
3645 rest_of_decl_compilation (decl, asmspec,
3646 (DECL_CONTEXT (decl) == 0
3647 || TREE_ASM_WRITTEN (decl)), 0);
3651 /* This is a local variable. If there is an ASMSPEC, the
3652 user has requested that we handle it specially. */
3655 /* In conjunction with an ASMSPEC, the `register'
3656 keyword indicates that we should place the variable
3657 in a particular register. */
3658 if (DECL_REGISTER (decl))
3659 DECL_C_HARD_REGISTER (decl) = 1;
3661 /* If this is not a static variable, issue a warning.
3662 It doesn't make any sense to give an ASMSPEC for an
3663 ordinary, non-register local variable. Historically,
3664 GCC has accepted -- but ignored -- the ASMSPEC in
3666 if (TREE_CODE (decl) == VAR_DECL
3667 && !DECL_REGISTER (decl)
3668 && !TREE_STATIC (decl))
3669 warning_with_decl (decl,
3670 "ignoring asm-specifier for non-static local variable `%s'");
3672 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3675 add_decl_stmt (decl);
3678 if (DECL_CONTEXT (decl) != 0)
3680 /* Recompute the RTL of a local array now
3681 if it used to be an incomplete type. */
3683 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3685 /* If we used it already as memory, it must stay in memory. */
3686 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3687 /* If it's still incomplete now, no init will save it. */
3688 if (DECL_SIZE (decl) == 0)
3689 DECL_INITIAL (decl) = 0;
3694 if (TREE_CODE (decl) == TYPE_DECL)
3696 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3697 maybe_objc_check_decl (decl);
3698 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3701 /* At the end of a declaration, throw away any variable type sizes
3702 of types defined inside that declaration. There is no use
3703 computing them in the following function definition. */
3704 if (current_binding_level == global_binding_level)
3705 get_pending_sizes ();
3708 /* If DECL has a cleanup, build and return that cleanup here.
3709 This is a callback called by expand_expr. */
3712 maybe_build_cleanup (decl)
3713 tree decl ATTRIBUTE_UNUSED;
3715 /* There are no cleanups in C. */
3719 /* Given a parsed parameter declaration,
3720 decode it into a PARM_DECL and push that on the current binding level.
3721 Also, for the sake of forward parm decls,
3722 record the given order of parms in `parm_order'. */
3725 push_parm_decl (parm)
3729 int old_immediate_size_expand = immediate_size_expand;
3730 /* Don't try computing parm sizes now -- wait till fn is called. */
3731 immediate_size_expand = 0;
3733 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3734 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3735 decl_attributes (&decl, TREE_VALUE (parm), 0);
3738 if (DECL_NAME (decl))
3741 olddecl = lookup_name (DECL_NAME (decl));
3742 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3743 pedwarn_with_decl (decl,
3744 "ANSI C forbids parameter `%s' shadowing typedef");
3748 decl = pushdecl (decl);
3750 immediate_size_expand = old_immediate_size_expand;
3752 current_binding_level->parm_order
3753 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3755 /* Add this decl to the current binding level. */
3756 finish_decl (decl, NULL_TREE, NULL_TREE);
3759 /* Clear the given order of parms in `parm_order'.
3760 Used at start of parm list,
3761 and also at semicolon terminating forward decls. */
3766 current_binding_level->parm_order = NULL_TREE;
3769 /* Make TYPE a complete type based on INITIAL_VALUE.
3770 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3771 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3774 complete_array_type (type, initial_value, do_default)
3779 register tree maxindex = NULL_TREE;
3784 /* Note MAXINDEX is really the maximum index,
3785 one less than the size. */
3786 if (TREE_CODE (initial_value) == STRING_CST)
3789 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3790 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3793 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3795 tree elts = CONSTRUCTOR_ELTS (initial_value);
3796 maxindex = build_int_2 (-1, -1);
3797 for (; elts; elts = TREE_CHAIN (elts))
3799 if (TREE_PURPOSE (elts))
3800 maxindex = TREE_PURPOSE (elts);
3802 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3803 maxindex, integer_one_node));
3805 maxindex = copy_node (maxindex);
3809 /* Make an error message unless that happened already. */
3810 if (initial_value != error_mark_node)
3813 /* Prevent further error messages. */
3814 maxindex = build_int_2 (0, 0);
3821 maxindex = build_int_2 (0, 0);
3827 TYPE_DOMAIN (type) = build_index_type (maxindex);
3828 if (!TREE_TYPE (maxindex))
3829 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3832 /* Lay out the type now that we can get the real answer. */
3839 /* Given declspecs and a declarator,
3840 determine the name and type of the object declared
3841 and construct a ..._DECL node for it.
3842 (In one case we can return a ..._TYPE node instead.
3843 For invalid input we sometimes return 0.)
3845 DECLSPECS is a chain of tree_list nodes whose value fields
3846 are the storage classes and type specifiers.
3848 DECL_CONTEXT says which syntactic context this declaration is in:
3849 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3850 FUNCDEF for a function definition. Like NORMAL but a few different
3851 error messages in each case. Return value may be zero meaning
3852 this definition is too screwy to try to parse.
3853 PARM for a parameter declaration (either within a function prototype
3854 or before a function body). Make a PARM_DECL, or return void_type_node.
3855 TYPENAME if for a typename (in a cast or sizeof).
3856 Don't make a DECL node; just return the ..._TYPE node.
3857 FIELD for a struct or union field; make a FIELD_DECL.
3858 BITFIELD for a field with specified width.
3859 INITIALIZED is 1 if the decl has an initializer.
3861 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3862 It may also be so in the PARM case, for a prototype where the
3863 argument type is specified but not the name.
3865 This function is where the complicated C meanings of `static'
3866 and `extern' are interpreted. */
3869 grokdeclarator (declarator, declspecs, decl_context, initialized)
3872 enum decl_context decl_context;
3877 tree type = NULL_TREE;
3882 int type_quals = TYPE_UNQUALIFIED;
3884 int explicit_int = 0;
3885 int explicit_char = 0;
3886 int defaulted_int = 0;
3887 tree typedef_decl = 0;
3889 tree typedef_type = 0;
3890 int funcdef_flag = 0;
3891 enum tree_code innermost_code = ERROR_MARK;
3893 int size_varies = 0;
3894 tree decl_attr = NULL_TREE;
3895 tree array_ptr_quals = NULL_TREE;
3896 int array_parm_static = 0;
3897 tree returned_attrs = NULL_TREE;
3899 if (decl_context == BITFIELD)
3900 bitfield = 1, decl_context = FIELD;
3902 if (decl_context == FUNCDEF)
3903 funcdef_flag = 1, decl_context = NORMAL;
3905 /* Look inside a declarator for the name being declared
3906 and get it as a string, for an error message. */
3908 register tree decl = declarator;
3912 switch (TREE_CODE (decl))
3917 innermost_code = TREE_CODE (decl);
3918 decl = TREE_OPERAND (decl, 0);
3922 decl = TREE_VALUE (decl);
3925 case IDENTIFIER_NODE:
3926 name = IDENTIFIER_POINTER (decl);
3937 /* A function definition's declarator must have the form of
3938 a function declarator. */
3940 if (funcdef_flag && innermost_code != CALL_EXPR)
3943 /* Anything declared one level down from the top level
3944 must be one of the parameters of a function
3945 (because the body is at least two levels down). */
3947 /* If this looks like a function definition, make it one,
3948 even if it occurs where parms are expected.
3949 Then store_parm_decls will reject it and not use it as a parm. */
3950 if (decl_context == NORMAL && !funcdef_flag
3951 && current_binding_level->parm_flag)
3952 decl_context = PARM;
3954 /* Look through the decl specs and record which ones appear.
3955 Some typespecs are defined as built-in typenames.
3956 Others, the ones that are modifiers of other types,
3957 are represented by bits in SPECBITS: set the bits for
3958 the modifiers that appear. Storage class keywords are also in SPECBITS.
3960 If there is a typedef name or a type, store the type in TYPE.
3961 This includes builtin typedefs such as `int'.
3963 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3964 and did not come from a user typedef.
3966 Set LONGLONG if `long' is mentioned twice. */
3968 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3970 register tree id = TREE_VALUE (spec);
3972 if (id == ridpointers[(int) RID_INT])
3974 if (id == ridpointers[(int) RID_CHAR])
3977 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3979 enum rid i = C_RID_CODE (id);
3980 if ((int) i <= (int) RID_LAST_MODIFIER)
3982 if (i == RID_LONG && (specbits & (1 << (int) i)))
3985 error ("`long long long' is too long for GCC");
3988 if (pedantic && !flag_isoc99 && ! in_system_header
3990 pedwarn ("ISO C89 does not support `long long'");
3994 else if (specbits & (1 << (int) i))
3995 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3996 specbits |= 1 << (int) i;
4001 error ("two or more data types in declaration of `%s'", name);
4002 /* Actual typedefs come to us as TYPE_DECL nodes. */
4003 else if (TREE_CODE (id) == TYPE_DECL)
4005 type = TREE_TYPE (id);
4006 decl_attr = DECL_ATTRIBUTES (id);
4009 /* Built-in types come as identifiers. */
4010 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4012 register tree t = lookup_name (id);
4013 if (TREE_TYPE (t) == error_mark_node)
4015 else if (!t || TREE_CODE (t) != TYPE_DECL)
4016 error ("`%s' fails to be a typedef or built in type",
4017 IDENTIFIER_POINTER (id));
4020 type = TREE_TYPE (t);
4024 else if (TREE_CODE (id) != ERROR_MARK)
4031 typedef_type = type;
4033 size_varies = C_TYPE_VARIABLE_SIZE (type);
4035 /* No type at all: default to `int', and set DEFAULTED_INT
4036 because it was not a user-defined typedef. */
4040 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4041 | (1 << (int) RID_SIGNED)
4042 | (1 << (int) RID_UNSIGNED)
4043 | (1 << (int) RID_COMPLEX))))
4044 /* Don't warn about typedef foo = bar. */
4045 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4046 && ! in_system_header)
4048 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4049 and this is a function, or if -Wimplicit; prefer the former
4050 warning since it is more explicit. */
4051 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4053 warn_about_return_type = 1;
4054 else if (warn_implicit_int || flag_isoc99)
4055 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4060 type = integer_type_node;
4063 /* Now process the modifiers that were specified
4064 and check for invalid combinations. */
4066 /* Long double is a special combination. */
4068 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4069 && TYPE_MAIN_VARIANT (type) == double_type_node)
4071 specbits &= ~(1 << (int) RID_LONG);
4072 type = long_double_type_node;
4075 /* Check all other uses of type modifiers. */
4077 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4078 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4082 if ((specbits & 1 << (int) RID_LONG)
4083 && (specbits & 1 << (int) RID_SHORT))
4084 error ("both long and short specified for `%s'", name);
4085 else if (((specbits & 1 << (int) RID_LONG)
4086 || (specbits & 1 << (int) RID_SHORT))
4088 error ("long or short specified with char for `%s'", name);
4089 else if (((specbits & 1 << (int) RID_LONG)
4090 || (specbits & 1 << (int) RID_SHORT))
4091 && TREE_CODE (type) == REAL_TYPE)
4093 static int already = 0;
4095 error ("long or short specified with floating type for `%s'", name);
4096 if (! already && ! pedantic)
4098 error ("the only valid combination is `long double'");
4102 else if ((specbits & 1 << (int) RID_SIGNED)
4103 && (specbits & 1 << (int) RID_UNSIGNED))
4104 error ("both signed and unsigned specified for `%s'", name);
4105 else if (TREE_CODE (type) != INTEGER_TYPE)
4106 error ("long, short, signed or unsigned invalid for `%s'", name);
4110 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4112 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4114 if (flag_pedantic_errors)
4119 /* Discard the type modifiers if they are invalid. */
4122 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4123 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4128 if ((specbits & (1 << (int) RID_COMPLEX))
4129 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4131 error ("complex invalid for `%s'", name);
4132 specbits &= ~(1 << (int) RID_COMPLEX);
4135 /* Decide whether an integer type is signed or not.
4136 Optionally treat bitfields as signed by default. */
4137 if (specbits & 1 << (int) RID_UNSIGNED
4138 /* Traditionally, all bitfields are unsigned. */
4139 || (bitfield && flag_traditional
4140 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4141 || (bitfield && ! flag_signed_bitfields
4142 && (explicit_int || defaulted_int || explicit_char
4143 /* A typedef for plain `int' without `signed'
4144 can be controlled just like plain `int'. */
4145 || ! (typedef_decl != 0
4146 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4147 && TREE_CODE (type) != ENUMERAL_TYPE
4148 && !(specbits & 1 << (int) RID_SIGNED)))
4151 type = long_long_unsigned_type_node;
4152 else if (specbits & 1 << (int) RID_LONG)
4153 type = long_unsigned_type_node;
4154 else if (specbits & 1 << (int) RID_SHORT)
4155 type = short_unsigned_type_node;
4156 else if (type == char_type_node)
4157 type = unsigned_char_type_node;
4158 else if (typedef_decl)
4159 type = unsigned_type (type);
4161 type = unsigned_type_node;
4163 else if ((specbits & 1 << (int) RID_SIGNED)
4164 && type == char_type_node)
4165 type = signed_char_type_node;
4167 type = long_long_integer_type_node;
4168 else if (specbits & 1 << (int) RID_LONG)
4169 type = long_integer_type_node;
4170 else if (specbits & 1 << (int) RID_SHORT)
4171 type = short_integer_type_node;
4173 if (specbits & 1 << (int) RID_COMPLEX)
4175 if (pedantic && !flag_isoc99)
4176 pedwarn ("ISO C89 does not support complex types");
4177 /* If we just have "complex", it is equivalent to
4178 "complex double", but if any modifiers at all are specified it is
4179 the complex form of TYPE. E.g, "complex short" is
4180 "complex short int". */
4182 if (defaulted_int && ! longlong
4183 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4184 | (1 << (int) RID_SIGNED)
4185 | (1 << (int) RID_UNSIGNED))))
4188 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4189 type = complex_double_type_node;
4191 else if (type == integer_type_node)
4194 pedwarn ("ISO C does not support complex integer types");
4195 type = complex_integer_type_node;
4197 else if (type == float_type_node)
4198 type = complex_float_type_node;
4199 else if (type == double_type_node)
4200 type = complex_double_type_node;
4201 else if (type == long_double_type_node)
4202 type = complex_long_double_type_node;
4206 pedwarn ("ISO C does not support complex integer types");
4207 type = build_complex_type (type);
4211 /* Figure out the type qualifiers for the declaration. There are
4212 two ways a declaration can become qualified. One is something
4213 like `const int i' where the `const' is explicit. Another is
4214 something like `typedef const int CI; CI i' where the type of the
4215 declaration contains the `const'. */
4216 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4217 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4218 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4219 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4220 if (constp > 1 && ! flag_isoc99)
4221 pedwarn ("duplicate `const'");
4222 if (restrictp > 1 && ! flag_isoc99)
4223 pedwarn ("duplicate `restrict'");
4224 if (volatilep > 1 && ! flag_isoc99)
4225 pedwarn ("duplicate `volatile'");
4226 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4227 type = TYPE_MAIN_VARIANT (type);
4228 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4229 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4230 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4232 /* Warn if two storage classes are given. Default to `auto'. */
4237 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4238 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4239 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4240 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4241 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4243 /* Warn about storage classes that are invalid for certain
4244 kinds of declarations (parameters, typenames, etc.). */
4247 error ("multiple storage classes in declaration of `%s'", name);
4248 else if (funcdef_flag
4250 & ((1 << (int) RID_REGISTER)
4251 | (1 << (int) RID_AUTO)
4252 | (1 << (int) RID_TYPEDEF))))
4254 if (specbits & 1 << (int) RID_AUTO
4255 && (pedantic || current_binding_level == global_binding_level))
4256 pedwarn ("function definition declared `auto'");
4257 if (specbits & 1 << (int) RID_REGISTER)
4258 error ("function definition declared `register'");
4259 if (specbits & 1 << (int) RID_TYPEDEF)
4260 error ("function definition declared `typedef'");
4261 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4262 | (1 << (int) RID_AUTO));
4264 else if (decl_context != NORMAL && nclasses > 0)
4266 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4270 switch (decl_context)
4273 error ("storage class specified for structure field `%s'",
4277 error ("storage class specified for parameter `%s'", name);
4280 error ("storage class specified for typename");
4283 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4284 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4285 | (1 << (int) RID_EXTERN));
4288 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4290 /* `extern' with initialization is invalid if not at top level. */
4291 if (current_binding_level == global_binding_level)
4292 warning ("`%s' initialized and declared `extern'", name);
4294 error ("`%s' has both `extern' and initializer", name);
4296 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4297 && current_binding_level != global_binding_level)
4298 error ("nested function `%s' declared `extern'", name);
4299 else if (current_binding_level == global_binding_level
4300 && specbits & (1 << (int) RID_AUTO))
4301 error ("top-level declaration of `%s' specifies `auto'", name);
4304 /* Now figure out the structure of the declarator proper.
4305 Descend through it, creating more complex types, until we reach
4306 the declared identifier (or NULL_TREE, in an absolute declarator). */
4308 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4310 if (type == error_mark_node)
4312 declarator = TREE_OPERAND (declarator, 0);
4316 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4317 an INDIRECT_REF (for *...),
4318 a CALL_EXPR (for ...(...)),
4319 a TREE_LIST (for nested attributes),
4320 an identifier (for the name being declared)
4321 or a null pointer (for the place in an absolute declarator
4322 where the name was omitted).
4323 For the last two cases, we have just exited the loop.
4325 At this point, TYPE is the type of elements of an array,
4326 or for a function to return, or for a pointer to point to.
4327 After this sequence of ifs, TYPE is the type of the
4328 array or function or pointer, and DECLARATOR has had its
4329 outermost layer removed. */
4331 if (array_ptr_quals != NULL_TREE || array_parm_static)
4333 /* Only the innermost declarator (making a parameter be of
4334 array type which is converted to pointer type)
4335 may have static or type qualifiers. */
4336 error ("static or type qualifiers in non-parameter array declarator");
4337 array_ptr_quals = NULL_TREE;
4338 array_parm_static = 0;
4341 if (TREE_CODE (declarator) == TREE_LIST)
4343 /* We encode a declarator with embedded attributes using
4345 tree attrs = TREE_PURPOSE (declarator);
4348 declarator = TREE_VALUE (declarator);
4349 inner_decl = declarator;
4350 while (inner_decl != NULL_TREE
4351 && TREE_CODE (inner_decl) == TREE_LIST)
4352 inner_decl = TREE_VALUE (inner_decl);
4353 if (inner_decl == NULL_TREE
4354 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4355 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4356 if (TREE_CODE (inner_decl) == CALL_EXPR)
4357 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4358 if (TREE_CODE (inner_decl) == ARRAY_REF)
4359 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4360 returned_attrs = decl_attributes (&type,
4361 chainon (returned_attrs, attrs),
4364 else if (TREE_CODE (declarator) == ARRAY_REF)
4366 register tree itype = NULL_TREE;
4367 register tree size = TREE_OPERAND (declarator, 1);
4368 /* The index is a signed object `sizetype' bits wide. */
4369 tree index_type = signed_type (sizetype);
4371 array_ptr_quals = TREE_TYPE (declarator);
4372 array_parm_static = TREE_STATIC (declarator);
4374 declarator = TREE_OPERAND (declarator, 0);
4376 /* Check for some types that there cannot be arrays of. */
4378 if (VOID_TYPE_P (type))
4380 error ("declaration of `%s' as array of voids", name);
4381 type = error_mark_node;
4384 if (TREE_CODE (type) == FUNCTION_TYPE)
4386 error ("declaration of `%s' as array of functions", name);
4387 type = error_mark_node;
4390 if (size == error_mark_node)
4391 type = error_mark_node;
4393 if (type == error_mark_node)
4396 /* If size was specified, set ITYPE to a range-type for that size.
4397 Otherwise, ITYPE remains null. finish_decl may figure it out
4398 from an initial value. */
4402 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4403 STRIP_TYPE_NOPS (size);
4405 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4407 error ("size of array `%s' has non-integer type", name);
4408 size = integer_one_node;
4411 if (pedantic && integer_zerop (size))
4412 pedwarn ("ISO C forbids zero-size array `%s'", name);
4414 if (TREE_CODE (size) == INTEGER_CST)
4416 constant_expression_warning (size);
4417 if (tree_int_cst_sgn (size) < 0)
4419 error ("size of array `%s' is negative", name);
4420 size = integer_one_node;
4425 /* Make sure the array size remains visibly nonconstant
4426 even if it is (eg) a const variable with known value. */
4431 if (TREE_CONSTANT (size))
4432 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4435 pedwarn ("ISO C89 forbids variable-size array `%s'",
4440 if (integer_zerop (size))
4442 /* A zero-length array cannot be represented with an
4443 unsigned index type, which is what we'll get with
4444 build_index_type. Create an open-ended range instead. */
4445 itype = build_range_type (sizetype, size, NULL_TREE);
4449 /* Compute the maximum valid index, that is, size - 1.
4450 Do the calculation in index_type, so that if it is
4451 a variable the computations will be done in the
4453 itype = fold (build (MINUS_EXPR, index_type,
4454 convert (index_type, size),
4455 convert (index_type, size_one_node)));
4457 /* If that overflowed, the array is too big.
4458 ??? While a size of INT_MAX+1 technically shouldn't
4459 cause an overflow (because we subtract 1), the overflow
4460 is recorded during the conversion to index_type, before
4461 the subtraction. Handling this case seems like an
4462 unnecessary complication. */
4463 if (TREE_OVERFLOW (itype))
4465 error ("size of array `%s' is too large", name);
4466 type = error_mark_node;
4471 itype = variable_size (itype);
4472 itype = build_index_type (itype);
4475 else if (decl_context == FIELD)
4477 /* ??? Need to check somewhere that this is a structure
4478 and not a union, that this field is last, and that
4479 this structure has at least one other named member. */
4481 if (pedantic && !flag_isoc99 && !in_system_header)
4482 pedwarn ("ISO C89 does not support flexible array members");
4484 /* ISO C99 Flexible array members are effectively identical
4485 to GCC's zero-length array extension. */
4486 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4489 /* If pedantic, complain about arrays of incomplete types. */
4491 if (pedantic && !COMPLETE_TYPE_P (type))
4492 pedwarn ("array type has incomplete element type");
4495 /* We shouldn't have a function type here at all!
4496 Functions aren't allowed as array elements. */
4497 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4498 && (constp || volatilep))
4499 pedwarn ("ANSI C forbids const or volatile function types");
4502 /* Build the array type itself, then merge any constancy or
4503 volatility into the target type. We must do it in this order
4504 to ensure that the TYPE_MAIN_VARIANT field of the array type
4505 is set correctly. */
4507 type = build_array_type (type, itype);
4509 type = c_build_qualified_type (type, type_quals);
4512 C_TYPE_VARIABLE_SIZE (type) = 1;
4514 /* The GCC extension for zero-length arrays differs from
4515 ISO flexible array members in that sizeof yields zero. */
4516 if (size && integer_zerop (size))
4519 TYPE_SIZE (type) = bitsize_zero_node;
4520 TYPE_SIZE_UNIT (type) = size_zero_node;
4522 if (decl_context != PARM
4523 && (array_ptr_quals != NULL_TREE || array_parm_static))
4525 error ("static or type qualifiers in non-parameter array declarator");
4526 array_ptr_quals = NULL_TREE;
4527 array_parm_static = 0;
4530 else if (TREE_CODE (declarator) == CALL_EXPR)
4534 /* Declaring a function type.
4535 Make sure we have a valid type for the function to return. */
4536 if (type == error_mark_node)
4541 /* Warn about some types functions can't return. */
4543 if (TREE_CODE (type) == FUNCTION_TYPE)
4545 error ("`%s' declared as function returning a function", name);
4546 type = integer_type_node;
4548 if (TREE_CODE (type) == ARRAY_TYPE)
4550 error ("`%s' declared as function returning an array", name);
4551 type = integer_type_node;
4554 #ifndef TRADITIONAL_RETURN_FLOAT
4555 /* Traditionally, declaring return type float means double. */
4557 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4558 type = double_type_node;
4559 #endif /* TRADITIONAL_RETURN_FLOAT */
4561 /* Construct the function type and go to the next
4562 inner layer of declarator. */
4564 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4566 /* Say it's a definition
4567 only for the CALL_EXPR
4568 closest to the identifier. */
4569 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4570 /* Type qualifiers before the return type of the function
4571 qualify the return type, not the function type. */
4574 /* Type qualifiers on a function return type are normally
4575 permitted by the standard but have no effect, so give a
4576 warning at -W. Qualifiers on a void return type have
4577 meaning as a GNU extension, and are banned on function
4578 definitions in ISO C. FIXME: strictly we shouldn't
4579 pedwarn for qualified void return types except on function
4580 definitions, but not doing so could lead to the undesirable
4581 state of a "volatile void" function return type not being
4582 warned about, and a use of the function being compiled
4583 with GNU semantics, with no diagnostics under -pedantic. */
4584 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4585 pedwarn ("ISO C forbids qualified void function return type");
4586 else if (extra_warnings
4587 && !(VOID_TYPE_P (type)
4588 && type_quals == TYPE_QUAL_VOLATILE))
4589 warning ("type qualifiers ignored on function return type");
4591 type = c_build_qualified_type (type, type_quals);
4593 type_quals = TYPE_UNQUALIFIED;
4595 type = build_function_type (type, arg_types);
4596 declarator = TREE_OPERAND (declarator, 0);
4598 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4599 the formal parameter list of this FUNCTION_TYPE to point to
4600 the FUNCTION_TYPE node itself. */
4605 for (link = last_function_parm_tags;
4607 link = TREE_CHAIN (link))
4608 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4611 else if (TREE_CODE (declarator) == INDIRECT_REF)
4613 /* Merge any constancy or volatility into the target type
4616 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4618 pedwarn ("ISO C forbids qualified function types");
4620 type = c_build_qualified_type (type, type_quals);
4621 type_quals = TYPE_UNQUALIFIED;
4624 type = build_pointer_type (type);
4626 /* Process a list of type modifier keywords
4627 (such as const or volatile) that were given inside the `*'. */
4629 if (TREE_TYPE (declarator))
4631 register tree typemodlist;
4637 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4638 typemodlist = TREE_CHAIN (typemodlist))
4640 tree qualifier = TREE_VALUE (typemodlist);
4642 if (C_IS_RESERVED_WORD (qualifier))
4644 if (C_RID_CODE (qualifier) == RID_CONST)
4646 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4648 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4658 error ("invalid type modifier within pointer declarator");
4659 if (constp > 1 && ! flag_isoc99)
4660 pedwarn ("duplicate `const'");
4661 if (volatilep > 1 && ! flag_isoc99)
4662 pedwarn ("duplicate `volatile'");
4663 if (restrictp > 1 && ! flag_isoc99)
4664 pedwarn ("duplicate `restrict'");
4666 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4667 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4668 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4671 declarator = TREE_OPERAND (declarator, 0);
4678 /* Now TYPE has the actual type. */
4680 /* Did array size calculations overflow? */
4682 if (TREE_CODE (type) == ARRAY_TYPE
4683 && COMPLETE_TYPE_P (type)
4684 && TREE_OVERFLOW (TYPE_SIZE (type)))
4686 error ("size of array `%s' is too large", name);
4687 /* If we proceed with the array type as it is, we'll eventully
4688 crash in tree_low_cst(). */
4689 type = error_mark_node;
4692 /* If this is declaring a typedef name, return a TYPE_DECL. */
4694 if (specbits & (1 << (int) RID_TYPEDEF))
4697 /* Note that the grammar rejects storage classes
4698 in typenames, fields or parameters */
4699 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4701 pedwarn ("ISO C forbids qualified function types");
4703 type = c_build_qualified_type (type, type_quals);
4704 decl = build_decl (TYPE_DECL, declarator, type);
4705 if ((specbits & (1 << (int) RID_SIGNED))
4706 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4707 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4708 decl_attributes (&decl, returned_attrs, 0);
4712 /* Detect the case of an array type of unspecified size
4713 which came, as such, direct from a typedef name.
4714 We must copy the type, so that each identifier gets
4715 a distinct type, so that each identifier's size can be
4716 controlled separately by its own initializer. */
4718 if (type != 0 && typedef_type != 0
4719 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4720 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4722 type = build_array_type (TREE_TYPE (type), 0);
4724 C_TYPE_VARIABLE_SIZE (type) = 1;
4727 /* If this is a type name (such as, in a cast or sizeof),
4728 compute the type and return it now. */
4730 if (decl_context == TYPENAME)
4732 /* Note that the grammar rejects storage classes
4733 in typenames, fields or parameters */
4734 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4736 pedwarn ("ISO C forbids const or volatile function types");
4738 type = c_build_qualified_type (type, type_quals);
4739 decl_attributes (&type, returned_attrs, 0);
4743 /* Aside from typedefs and type names (handle above),
4744 `void' at top level (not within pointer)
4745 is allowed only in public variables.
4746 We don't complain about parms either, but that is because
4747 a better error message can be made later. */
4749 if (VOID_TYPE_P (type) && decl_context != PARM
4750 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4751 && ((specbits & (1 << (int) RID_EXTERN))
4752 || (current_binding_level == global_binding_level
4754 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4756 error ("variable or field `%s' declared void", name);
4757 type = integer_type_node;
4760 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4761 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4766 if (decl_context == PARM)
4768 tree type_as_written;
4771 /* A parameter declared as an array of T is really a pointer to T.
4772 One declared as a function is really a pointer to a function. */
4774 if (TREE_CODE (type) == ARRAY_TYPE)
4776 /* Transfer const-ness of array into that of type pointed to. */
4777 type = TREE_TYPE (type);
4779 type = c_build_qualified_type (type, type_quals);
4780 type = build_pointer_type (type);
4781 type_quals = TYPE_UNQUALIFIED;
4782 if (array_ptr_quals)
4784 tree new_ptr_quals, new_ptr_attrs;
4786 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4787 /* We don't yet implement attributes in this context. */
4788 if (new_ptr_attrs != NULL_TREE)
4789 warning ("attributes in parameter array declarator ignored");
4794 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4796 tree qualifier = TREE_VALUE (new_ptr_quals);
4798 if (C_IS_RESERVED_WORD (qualifier))
4800 if (C_RID_CODE (qualifier) == RID_CONST)
4802 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4804 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4814 error ("invalid type modifier within array declarator");
4816 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4817 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4818 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4822 else if (TREE_CODE (type) == FUNCTION_TYPE)
4824 if (pedantic && type_quals)
4825 pedwarn ("ISO C forbids qualified function types");
4827 type = c_build_qualified_type (type, type_quals);
4828 type = build_pointer_type (type);
4829 type_quals = TYPE_UNQUALIFIED;
4831 else if (type_quals)
4832 type = c_build_qualified_type (type, type_quals);
4834 type_as_written = type;
4836 decl = build_decl (PARM_DECL, declarator, type);
4838 C_DECL_VARIABLE_SIZE (decl) = 1;
4840 /* Compute the type actually passed in the parmlist,
4841 for the case where there is no prototype.
4842 (For example, shorts and chars are passed as ints.)
4843 When there is a prototype, this is overridden later. */
4845 if (type == error_mark_node)
4846 promoted_type = type;
4849 promoted_type = simple_type_promotes_to (type);
4850 if (! promoted_type)
4851 promoted_type = type;
4854 DECL_ARG_TYPE (decl) = promoted_type;
4855 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4857 else if (decl_context == FIELD)
4859 /* Structure field. It may not be a function. */
4861 if (TREE_CODE (type) == FUNCTION_TYPE)
4863 error ("field `%s' declared as a function", name);
4864 type = build_pointer_type (type);
4866 else if (TREE_CODE (type) != ERROR_MARK
4867 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4869 error ("field `%s' has incomplete type", name);
4870 type = error_mark_node;
4872 /* Move type qualifiers down to element of an array. */
4873 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4875 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4877 TYPE_DOMAIN (type));
4879 /* Leave the field const or volatile as well. */
4880 type_quals = TYPE_UNQUALIFIED;
4883 decl = build_decl (FIELD_DECL, declarator, type);
4884 DECL_NONADDRESSABLE_P (decl) = bitfield;
4887 C_DECL_VARIABLE_SIZE (decl) = 1;
4889 else if (TREE_CODE (type) == FUNCTION_TYPE)
4891 /* Every function declaration is "external"
4892 except for those which are inside a function body
4893 in which `auto' is used.
4894 That is a case not specified by ANSI C,
4895 and we use it for forward declarations for nested functions. */
4896 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4897 || current_binding_level == global_binding_level);
4899 if (specbits & (1 << (int) RID_AUTO)
4900 && (pedantic || current_binding_level == global_binding_level))
4901 pedwarn ("invalid storage class for function `%s'", name);
4902 if (specbits & (1 << (int) RID_REGISTER))
4903 error ("invalid storage class for function `%s'", name);
4904 /* Function declaration not at top level.
4905 Storage classes other than `extern' are not allowed
4906 and `extern' makes no difference. */
4907 if (current_binding_level != global_binding_level
4908 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4910 pedwarn ("invalid storage class for function `%s'", name);
4912 decl = build_decl (FUNCTION_DECL, declarator, type);
4913 decl = build_decl_attribute_variant (decl, decl_attr);
4915 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4916 pedwarn ("ISO C forbids qualified function types");
4918 /* GNU C interprets a `volatile void' return type to indicate
4919 that the function does not return. */
4920 if ((type_quals & TYPE_QUAL_VOLATILE)
4921 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4922 warning ("`noreturn' function returns non-void value");
4925 DECL_EXTERNAL (decl) = 1;
4926 /* Record absence of global scope for `static' or `auto'. */
4928 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4930 /* Record presence of `inline', if it is reasonable. */
4933 if (MAIN_NAME_P (declarator))
4934 warning ("cannot inline function `main'");
4936 /* Assume that otherwise the function can be inlined. */
4937 DECL_INLINE (decl) = 1;
4939 if (specbits & (1 << (int) RID_EXTERN))
4940 current_extern_inline = 1;
4945 /* It's a variable. */
4946 /* An uninitialized decl with `extern' is a reference. */
4947 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4949 /* Move type qualifiers down to element of an array. */
4950 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4952 int saved_align = TYPE_ALIGN(type);
4953 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4955 TYPE_DOMAIN (type));
4956 TYPE_ALIGN (type) = saved_align;
4957 #if 0 /* Leave the variable const or volatile as well. */
4958 type_quals = TYPE_UNQUALIFIED;
4961 else if (type_quals)
4962 type = c_build_qualified_type (type, type_quals);
4964 decl = build_decl (VAR_DECL, declarator, type);
4966 C_DECL_VARIABLE_SIZE (decl) = 1;
4969 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4971 DECL_EXTERNAL (decl) = extern_ref;
4972 /* At top level, the presence of a `static' or `register' storage
4973 class specifier, or the absence of all storage class specifiers
4974 makes this declaration a definition (perhaps tentative). Also,
4975 the absence of both `static' and `register' makes it public. */
4976 if (current_binding_level == global_binding_level)
4980 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4981 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4983 /* Not at top level, only `static' makes a static definition. */
4986 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4987 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4991 /* Record `register' declaration for warnings on &
4992 and in case doing stupid register allocation. */
4994 if (specbits & (1 << (int) RID_REGISTER))
4995 DECL_REGISTER (decl) = 1;
4997 /* Record constancy and volatility. */
4998 c_apply_type_quals_to_decl (type_quals, decl);
5000 /* If a type has volatile components, it should be stored in memory.
5001 Otherwise, the fact that those components are volatile
5002 will be ignored, and would even crash the compiler. */
5003 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5004 mark_addressable (decl);
5006 decl_attributes (&decl, returned_attrs, 0);
5012 /* Decode the parameter-list info for a function type or function definition.
5013 The argument is the value returned by `get_parm_info' (or made in parse.y
5014 if there is an identifier list instead of a parameter decl list).
5015 These two functions are separate because when a function returns
5016 or receives functions then each is called multiple times but the order
5017 of calls is different. The last call to `grokparms' is always the one
5018 that contains the formal parameter names of a function definition.
5020 Store in `last_function_parms' a chain of the decls of parms.
5021 Also store in `last_function_parm_tags' a chain of the struct, union,
5022 and enum tags declared among the parms.
5024 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5026 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5027 a mere declaration. A nonempty identifier-list gets an error message
5028 when FUNCDEF_FLAG is zero. */
5031 grokparms (parms_info, funcdef_flag)
5035 tree first_parm = TREE_CHAIN (parms_info);
5037 last_function_parms = TREE_PURPOSE (parms_info);
5038 last_function_parm_tags = TREE_VALUE (parms_info);
5040 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5041 && !in_system_header)
5042 warning ("function declaration isn't a prototype");
5045 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5048 pedwarn ("parameter names (without types) in function declaration");
5050 last_function_parms = first_parm;
5057 /* We no longer test FUNCDEF_FLAG.
5058 If the arg types are incomplete in a declaration,
5059 they must include undefined tags.
5060 These tags can never be defined in the scope of the declaration,
5061 so the types can never be completed,
5062 and no call can be compiled successfully. */
5064 /* In a fcn definition, arg types must be complete. */
5067 for (parm = last_function_parms, typelt = first_parm;
5069 parm = TREE_CHAIN (parm))
5070 /* Skip over any enumeration constants declared here. */
5071 if (TREE_CODE (parm) == PARM_DECL)
5073 /* Barf if the parameter itself has an incomplete type. */
5074 tree type = TREE_VALUE (typelt);
5075 if (type == error_mark_node)
5077 if (!COMPLETE_TYPE_P (type))
5079 if (funcdef_flag && DECL_NAME (parm) != 0)
5080 error ("parameter `%s' has incomplete type",
5081 IDENTIFIER_POINTER (DECL_NAME (parm)));
5083 warning ("parameter has incomplete type");
5086 TREE_VALUE (typelt) = error_mark_node;
5087 TREE_TYPE (parm) = error_mark_node;
5091 /* This has been replaced by parm_tags_warning, which
5092 uses a more accurate criterion for what to warn
5096 /* Now warn if is a pointer to an incomplete type. */
5097 while (TREE_CODE (type) == POINTER_TYPE
5098 || TREE_CODE (type) == REFERENCE_TYPE)
5099 type = TREE_TYPE (type);
5100 type = TYPE_MAIN_VARIANT (type);
5101 if (!COMPLETE_TYPE_P (type))
5103 if (DECL_NAME (parm) != 0)
5104 warning ("parameter `%s' points to incomplete type",
5105 IDENTIFIER_POINTER (DECL_NAME (parm)));
5107 warning ("parameter points to incomplete type");
5111 typelt = TREE_CHAIN (typelt);
5118 /* Return a tree_list node with info on a parameter list just parsed.
5119 The TREE_PURPOSE is a chain of decls of those parms.
5120 The TREE_VALUE is a list of structure, union and enum tags defined.
5121 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5122 This tree_list node is later fed to `grokparms'.
5124 VOID_AT_END nonzero means append `void' to the end of the type-list.
5125 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5128 get_parm_info (void_at_end)
5131 register tree decl, t;
5132 register tree types = 0;
5134 tree tags = gettags ();
5135 tree parms = getdecls ();
5137 tree order = current_binding_level->parm_order;
5139 /* Just `void' (and no ellipsis) is special. There are really no parms.
5140 But if the `void' is qualified (by `const' or `volatile') or has a
5141 storage class specifier (`register'), then the behavior is undefined;
5142 by not counting it as the special case of `void' we will cause an
5143 error later. Typedefs for `void' are OK (see DR#157). */
5144 if (void_at_end && parms != 0
5145 && TREE_CHAIN (parms) == 0
5146 && VOID_TYPE_P (TREE_TYPE (parms))
5147 && ! TREE_THIS_VOLATILE (parms)
5148 && ! TREE_READONLY (parms)
5149 && ! DECL_REGISTER (parms)
5150 && DECL_NAME (parms) == 0)
5153 storedecls (NULL_TREE);
5154 return tree_cons (NULL_TREE, NULL_TREE,
5155 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5158 /* Extract enumerator values and other non-parms declared with the parms.
5159 Likewise any forward parm decls that didn't have real parm decls. */
5160 for (decl = parms; decl;)
5162 tree next = TREE_CHAIN (decl);
5164 if (TREE_CODE (decl) != PARM_DECL)
5166 TREE_CHAIN (decl) = new_parms;
5169 else if (TREE_ASM_WRITTEN (decl))
5171 error_with_decl (decl,
5172 "parameter `%s' has just a forward declaration");
5173 TREE_CHAIN (decl) = new_parms;
5179 /* Put the parm decls back in the order they were in in the parm list. */
5180 for (t = order; t; t = TREE_CHAIN (t))
5183 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5185 TREE_CHAIN (TREE_VALUE (t)) = 0;
5188 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5191 /* Store the parmlist in the binding level since the old one
5192 is no longer a valid list. (We have changed the chain pointers.) */
5193 storedecls (new_parms);
5195 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5196 /* There may also be declarations for enumerators if an enumeration
5197 type is declared among the parms. Ignore them here. */
5198 if (TREE_CODE (decl) == PARM_DECL)
5200 /* Since there is a prototype,
5201 args are passed in their declared types. */
5202 tree type = TREE_TYPE (decl);
5203 DECL_ARG_TYPE (decl) = type;
5204 if (PROMOTE_PROTOTYPES
5205 && INTEGRAL_TYPE_P (type)
5206 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5207 DECL_ARG_TYPE (decl) = integer_type_node;
5209 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5210 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5211 && DECL_NAME (decl) == 0)
5213 error ("`void' in parameter list must be the entire list");
5219 return tree_cons (new_parms, tags,
5220 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5222 return tree_cons (new_parms, tags, nreverse (types));
5225 /* At end of parameter list, warn about any struct, union or enum tags
5226 defined within. Do so because these types cannot ever become complete. */
5229 parmlist_tags_warning ()
5234 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5236 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5237 /* An anonymous union parm type is meaningful as a GNU extension.
5238 So don't warn for that. */
5239 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5241 if (TREE_PURPOSE (elt) != 0)
5242 warning ("`%s %s' declared inside parameter list",
5243 (code == RECORD_TYPE ? "struct"
5244 : code == UNION_TYPE ? "union"
5246 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5249 /* For translation these need to be seperate warnings */
5250 if (code == RECORD_TYPE)
5251 warning ("anonymous struct declared inside parameter list");
5252 else if (code == UNION_TYPE)
5253 warning ("anonymous union declared inside parameter list");
5255 warning ("anonymous enum declared inside parameter list");
5259 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5265 /* Get the struct, enum or union (CODE says which) with tag NAME.
5266 Define the tag as a forward-reference if it is not defined. */
5269 xref_tag (code, name)
5270 enum tree_code code;
5273 /* If a cross reference is requested, look up the type
5274 already defined for this tag and return it. */
5276 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5277 /* If this is the right type of tag, return what we found.
5278 (This reference will be shadowed by shadow_tag later if appropriate.)
5279 If this is the wrong type of tag, do not return it. If it was the
5280 wrong type in the same binding level, we will have had an error
5281 message already; if in a different binding level and declaring
5282 a name, pending_xref_error will give an error message; but if in a
5283 different binding level and not declaring a name, this tag should
5284 shadow the previous declaration of a different type of tag, and
5285 this would not work properly if we return the reference found.
5286 (For example, with "struct foo" in an outer scope, "union foo;"
5287 must shadow that tag with a new one of union type.) */
5288 if (ref && TREE_CODE (ref) == code)
5291 /* If no such tag is yet defined, create a forward-reference node
5292 and record it as the "definition".
5293 When a real declaration of this type is found,
5294 the forward-reference will be altered into a real type. */
5296 ref = make_node (code);
5297 if (code == ENUMERAL_TYPE)
5299 /* Give the type a default layout like unsigned int
5300 to avoid crashing if it does not get defined. */
5301 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5302 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5303 TYPE_USER_ALIGN (ref) = 0;
5304 TREE_UNSIGNED (ref) = 1;
5305 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5306 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5307 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5310 pushtag (name, ref);
5315 /* Make sure that the tag NAME is defined *in the current binding level*
5316 at least as a forward reference.
5317 CODE says which kind of tag NAME ought to be. */
5320 start_struct (code, name)
5321 enum tree_code code;
5324 /* If there is already a tag defined at this binding level
5325 (as a forward reference), just return it. */
5327 register tree ref = 0;
5330 ref = lookup_tag (code, name, current_binding_level, 1);
5331 if (ref && TREE_CODE (ref) == code)
5333 C_TYPE_BEING_DEFINED (ref) = 1;
5334 TYPE_PACKED (ref) = flag_pack_struct;
5335 if (TYPE_FIELDS (ref))
5336 error ("redefinition of `%s %s'",
5337 code == UNION_TYPE ? "union" : "struct",
5338 IDENTIFIER_POINTER (name));
5343 /* Otherwise create a forward-reference just so the tag is in scope. */
5345 ref = make_node (code);
5346 pushtag (name, ref);
5347 C_TYPE_BEING_DEFINED (ref) = 1;
5348 TYPE_PACKED (ref) = flag_pack_struct;
5352 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5353 of a structure component, returning a FIELD_DECL node.
5354 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5356 This is done during the parsing of the struct declaration.
5357 The FIELD_DECL nodes are chained together and the lot of them
5358 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5361 grokfield (filename, line, declarator, declspecs, width)
5362 const char *filename ATTRIBUTE_UNUSED;
5363 int line ATTRIBUTE_UNUSED;
5364 tree declarator, declspecs, width;
5368 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5370 finish_decl (value, NULL_TREE, NULL_TREE);
5371 DECL_INITIAL (value) = width;
5373 maybe_objc_check_decl (value);
5377 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5378 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5379 ATTRIBUTES are attributes to be applied to the structure. */
5382 finish_struct (t, fieldlist, attributes)
5388 int toplevel = global_binding_level == current_binding_level;
5389 int saw_named_field;
5391 /* If this type was previously laid out as a forward reference,
5392 make sure we lay it out again. */
5396 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5398 /* Nameless union parm types are useful as GCC extension. */
5399 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5400 /* Otherwise, warn about any struct or union def. in parmlist. */
5401 if (in_parm_level_p ())
5404 pedwarn ("%s defined inside parms",
5405 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5406 else if (! flag_traditional)
5407 warning ("%s defined inside parms",
5408 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5413 for (x = fieldlist; x; x = TREE_CHAIN (x))
5414 if (DECL_NAME (x) != 0)
5418 pedwarn ("%s has no %s",
5419 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5420 fieldlist ? _("named members") : _("members"));
5423 /* Install struct as DECL_CONTEXT of each field decl.
5424 Also process specified field sizes,m which is found in the DECL_INITIAL.
5425 Store 0 there, except for ": 0" fields (so we can find them
5426 and delete them, below). */
5428 saw_named_field = 0;
5429 for (x = fieldlist; x; x = TREE_CHAIN (x))
5431 DECL_CONTEXT (x) = t;
5432 DECL_PACKED (x) |= TYPE_PACKED (t);
5434 /* If any field is const, the structure type is pseudo-const. */
5435 if (TREE_READONLY (x))
5436 C_TYPE_FIELDS_READONLY (t) = 1;
5439 /* A field that is pseudo-const makes the structure likewise. */
5440 tree t1 = TREE_TYPE (x);
5441 while (TREE_CODE (t1) == ARRAY_TYPE)
5442 t1 = TREE_TYPE (t1);
5443 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5444 && C_TYPE_FIELDS_READONLY (t1))
5445 C_TYPE_FIELDS_READONLY (t) = 1;
5448 /* Any field that is volatile means variables of this type must be
5449 treated in some ways as volatile. */
5450 if (TREE_THIS_VOLATILE (x))
5451 C_TYPE_FIELDS_VOLATILE (t) = 1;
5453 /* Any field of nominal variable size implies structure is too. */
5454 if (C_DECL_VARIABLE_SIZE (x))
5455 C_TYPE_VARIABLE_SIZE (t) = 1;
5457 /* Detect invalid nested redefinition. */
5458 if (TREE_TYPE (x) == t)
5459 error ("nested redefinition of `%s'",
5460 IDENTIFIER_POINTER (TYPE_NAME (t)));
5462 /* Detect invalid bit-field size. */
5463 if (DECL_INITIAL (x))
5464 STRIP_NOPS (DECL_INITIAL (x));
5465 if (DECL_INITIAL (x))
5467 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5468 constant_expression_warning (DECL_INITIAL (x));
5472 "bit-field `%s' width not an integer constant");
5473 DECL_INITIAL (x) = NULL;
5477 /* Detect invalid bit-field type. */
5478 if (DECL_INITIAL (x)
5479 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5480 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5481 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5483 error_with_decl (x, "bit-field `%s' has invalid type");
5484 DECL_INITIAL (x) = NULL;
5487 if (DECL_INITIAL (x) && pedantic
5488 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5489 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5490 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5491 /* Accept an enum that's equivalent to int or unsigned int. */
5492 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5493 && (TYPE_PRECISION (TREE_TYPE (x))
5494 == TYPE_PRECISION (integer_type_node))))
5495 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5497 /* Detect and ignore out of range field width and process valid
5499 if (DECL_INITIAL (x))
5502 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5503 max_width = CHAR_TYPE_SIZE;
5505 max_width = TYPE_PRECISION (TREE_TYPE (x));
5506 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5507 error_with_decl (x, "negative width in bit-field `%s'");
5508 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5509 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5510 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5511 error_with_decl (x, "zero width for bit-field `%s'");
5514 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5515 unsigned HOST_WIDE_INT width
5516 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5518 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5519 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5520 TREE_UNSIGNED (TREE_TYPE (x)))
5522 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5523 TREE_UNSIGNED (TREE_TYPE (x))))))
5524 warning_with_decl (x,
5525 "`%s' is narrower than values of its type");
5527 DECL_SIZE (x) = bitsize_int (width);
5528 DECL_BIT_FIELD (x) = 1;
5529 SET_DECL_C_BIT_FIELD (x);
5533 /* field size 0 => force desired amount of alignment. */
5534 #ifdef EMPTY_FIELD_BOUNDARY
5535 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5537 #ifdef PCC_BITFIELD_TYPE_MATTERS
5538 if (PCC_BITFIELD_TYPE_MATTERS)
5540 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5541 TYPE_ALIGN (TREE_TYPE (x)));
5542 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5549 else if (TREE_TYPE (x) != error_mark_node)
5551 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5552 : TYPE_ALIGN (TREE_TYPE (x)));
5554 /* Non-bit-fields are aligned for their type, except packed
5555 fields which require only BITS_PER_UNIT alignment. */
5556 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5557 if (! DECL_PACKED (x))
5558 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5561 DECL_INITIAL (x) = 0;
5563 /* Detect flexible array member in an invalid context. */
5564 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5565 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5566 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5567 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5569 if (TREE_CODE (t) == UNION_TYPE)
5570 error_with_decl (x, "flexible array member in union");
5571 else if (TREE_CHAIN (x) != NULL_TREE)
5572 error_with_decl (x, "flexible array member not at end of struct");
5573 else if (! saw_named_field)
5574 error_with_decl (x, "flexible array member in otherwise empty struct");
5577 saw_named_field = 1;
5580 /* Delete all duplicate fields from the fieldlist */
5581 for (x = fieldlist; x && TREE_CHAIN (x);)
5582 /* Anonymous fields aren't duplicates. */
5583 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5587 register tree y = fieldlist;
5591 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5597 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5599 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5600 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5606 /* Now we have the nearly final fieldlist. Record it,
5607 then lay out the structure or union (including the fields). */
5609 TYPE_FIELDS (t) = fieldlist;
5613 /* Delete all zero-width bit-fields from the fieldlist */
5615 tree *fieldlistp = &fieldlist;
5617 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5618 *fieldlistp = TREE_CHAIN (*fieldlistp);
5620 fieldlistp = &TREE_CHAIN (*fieldlistp);
5623 /* Now we have the truly final field list.
5624 Store it in this type and in the variants. */
5626 TYPE_FIELDS (t) = fieldlist;
5628 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5630 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5631 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5632 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5633 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5636 /* If this was supposed to be a transparent union, but we can't
5637 make it one, warn and turn off the flag. */
5638 if (TREE_CODE (t) == UNION_TYPE
5639 && TYPE_TRANSPARENT_UNION (t)
5640 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5642 TYPE_TRANSPARENT_UNION (t) = 0;
5643 warning ("union cannot be made transparent");
5646 /* If this structure or union completes the type of any previous
5647 variable declaration, lay it out and output its rtl. */
5649 if (current_binding_level->n_incomplete != 0)
5652 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5654 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5655 && TREE_CODE (decl) != TYPE_DECL)
5657 layout_decl (decl, 0);
5658 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5659 maybe_objc_check_decl (decl);
5660 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5663 --current_binding_level->n_incomplete;
5665 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5666 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5668 tree element = TREE_TYPE (decl);
5669 while (TREE_CODE (element) == ARRAY_TYPE)
5670 element = TREE_TYPE (element);
5672 layout_array_type (TREE_TYPE (decl));
5677 /* Finish debugging output for this type. */
5678 rest_of_type_compilation (t, toplevel);
5683 /* Lay out the type T, and its element type, and so on. */
5686 layout_array_type (t)
5689 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5690 layout_array_type (TREE_TYPE (t));
5694 /* Begin compiling the definition of an enumeration type.
5695 NAME is its name (or null if anonymous).
5696 Returns the type object, as yet incomplete.
5697 Also records info about it so that build_enumerator
5698 may be used to declare the individual values as they are read. */
5704 register tree enumtype = 0;
5706 /* If this is the real definition for a previous forward reference,
5707 fill in the contents in the same object that used to be the
5708 forward reference. */
5711 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5713 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5715 enumtype = make_node (ENUMERAL_TYPE);
5716 pushtag (name, enumtype);
5719 C_TYPE_BEING_DEFINED (enumtype) = 1;
5721 if (TYPE_VALUES (enumtype) != 0)
5723 /* This enum is a named one that has been declared already. */
5724 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5726 /* Completely replace its old definition.
5727 The old enumerators remain defined, however. */
5728 TYPE_VALUES (enumtype) = 0;
5731 enum_next_value = integer_zero_node;
5734 if (flag_short_enums)
5735 TYPE_PACKED (enumtype) = 1;
5740 /* After processing and defining all the values of an enumeration type,
5741 install their decls in the enumeration type and finish it off.
5742 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5743 and ATTRIBUTES are the specified attributes.
5744 Returns ENUMTYPE. */
5747 finish_enum (enumtype, values, attributes)
5752 register tree pair, tem;
5753 tree minnode = 0, maxnode = 0, enum_value_type;
5754 int precision, unsign;
5755 int toplevel = (global_binding_level == current_binding_level);
5757 if (in_parm_level_p ())
5758 warning ("enum defined inside parms");
5760 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5762 /* Calculate the maximum value of any enumerator in this type. */
5764 if (values == error_mark_node)
5765 minnode = maxnode = integer_zero_node;
5768 minnode = maxnode = TREE_VALUE (values);
5769 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5771 tree value = TREE_VALUE (pair);
5772 if (tree_int_cst_lt (maxnode, value))
5774 if (tree_int_cst_lt (value, minnode))
5779 /* Construct the final type of this enumeration. It is the same
5780 as one of the integral types - the narrowest one that fits, except
5781 that normally we only go as narrow as int - and signed iff any of
5782 the values are negative. */
5783 unsign = (tree_int_cst_sgn (minnode) >= 0);
5784 precision = MAX (min_precision (minnode, unsign),
5785 min_precision (maxnode, unsign));
5786 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5788 tree narrowest = type_for_size (precision, unsign);
5791 warning ("enumeration values exceed range of largest integer");
5792 narrowest = long_long_integer_type_node;
5795 precision = TYPE_PRECISION (narrowest);
5798 precision = TYPE_PRECISION (integer_type_node);
5800 if (precision == TYPE_PRECISION (integer_type_node))
5801 enum_value_type = type_for_size (precision, 0);
5803 enum_value_type = enumtype;
5805 TYPE_MIN_VALUE (enumtype) = minnode;
5806 TYPE_MAX_VALUE (enumtype) = maxnode;
5807 TYPE_PRECISION (enumtype) = precision;
5808 TREE_UNSIGNED (enumtype) = unsign;
5809 TYPE_SIZE (enumtype) = 0;
5810 layout_type (enumtype);
5812 if (values != error_mark_node)
5814 /* Change the type of the enumerators to be the enum type. We
5815 need to do this irrespective of the size of the enum, for
5816 proper type checking. Replace the DECL_INITIALs of the
5817 enumerators, and the value slots of the list, with copies
5818 that have the enum type; they cannot be modified in place
5819 because they may be shared (e.g. integer_zero_node) Finally,
5820 change the purpose slots to point to the names of the decls. */
5821 for (pair = values; pair; pair = TREE_CHAIN (pair))
5823 tree enu = TREE_PURPOSE (pair);
5825 TREE_TYPE (enu) = enumtype;
5826 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5827 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5828 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5829 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5830 DECL_MODE (enu) = TYPE_MODE (enumtype);
5832 /* The ISO C Standard mandates enumerators to have type int,
5833 even though the underlying type of an enum type is
5834 unspecified. Here we convert any enumerators that fit in
5835 an int to type int, to avoid promotions to unsigned types
5836 when comparing integers with enumerators that fit in the
5837 int range. When -pedantic is given, build_enumerator()
5838 would have already taken care of those that don't fit. */
5839 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5840 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5842 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5844 TREE_PURPOSE (pair) = DECL_NAME (enu);
5845 TREE_VALUE (pair) = DECL_INITIAL (enu);
5848 TYPE_VALUES (enumtype) = values;
5851 /* Fix up all variant types of this enum type. */
5852 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5854 if (tem == enumtype)
5856 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5857 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5858 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5859 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5860 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5861 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5862 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5863 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5864 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5865 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5868 /* Finish debugging output for this type. */
5869 rest_of_type_compilation (enumtype, toplevel);
5874 /* Build and install a CONST_DECL for one value of the
5875 current enumeration type (one that was begun with start_enum).
5876 Return a tree-list containing the CONST_DECL and its value.
5877 Assignment of sequential values by default is handled here. */
5880 build_enumerator (name, value)
5883 register tree decl, type;
5885 /* Validate and default VALUE. */
5887 /* Remove no-op casts from the value. */
5889 STRIP_TYPE_NOPS (value);
5893 if (TREE_CODE (value) == INTEGER_CST)
5895 value = default_conversion (value);
5896 constant_expression_warning (value);
5900 error ("enumerator value for `%s' not integer constant",
5901 IDENTIFIER_POINTER (name));
5906 /* Default based on previous value. */
5907 /* It should no longer be possible to have NON_LVALUE_EXPR
5911 value = enum_next_value;
5913 error ("overflow in enumeration values");
5916 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5918 pedwarn ("ISO C restricts enumerator values to range of `int'");
5919 value = convert (integer_type_node, value);
5922 /* Set basis for default for next value. */
5923 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5924 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5926 /* Now create a declaration for the enum value name. */
5928 type = TREE_TYPE (value);
5929 type = type_for_size (MAX (TYPE_PRECISION (type),
5930 TYPE_PRECISION (integer_type_node)),
5932 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5933 && TREE_UNSIGNED (type)));
5935 decl = build_decl (CONST_DECL, name, type);
5936 DECL_INITIAL (decl) = convert (type, value);
5939 return tree_cons (decl, value, NULL_TREE);
5943 /* Create the FUNCTION_DECL for a function definition.
5944 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5945 the declaration; they describe the function's name and the type it returns,
5946 but twisted together in a fashion that parallels the syntax of C.
5948 This function creates a binding context for the function body
5949 as well as setting up the FUNCTION_DECL in current_function_decl.
5951 Returns 1 on success. If the DECLARATOR is not suitable for a function
5952 (it defines a datum instead), we return 0, which tells
5953 yyparse to report a parse error. */
5956 start_function (declspecs, declarator, attributes)
5957 tree declarator, declspecs, attributes;
5959 tree decl1, old_decl;
5961 int old_immediate_size_expand = immediate_size_expand;
5963 current_function_returns_value = 0; /* Assume, until we see it does. */
5964 current_function_returns_null = 0;
5965 warn_about_return_type = 0;
5966 current_extern_inline = 0;
5967 c_function_varargs = 0;
5969 shadowed_labels = 0;
5971 /* Don't expand any sizes in the return type of the function. */
5972 immediate_size_expand = 0;
5974 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5976 /* If the declarator is not suitable for a function definition,
5977 cause a syntax error. */
5980 immediate_size_expand = old_immediate_size_expand;
5984 decl_attributes (&decl1, attributes, 0);
5986 announce_function (decl1);
5988 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5990 error ("return type is an incomplete type");
5991 /* Make it return void instead. */
5993 = build_function_type (void_type_node,
5994 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5997 if (warn_about_return_type)
5998 pedwarn_c99 ("return type defaults to `int'");
6000 /* Save the parm names or decls from this function's declarator
6001 where store_parm_decls will find them. */
6002 current_function_parms = last_function_parms;
6003 current_function_parm_tags = last_function_parm_tags;
6005 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6006 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6007 DECL_INITIAL (decl1) = error_mark_node;
6009 /* If this definition isn't a prototype and we had a prototype declaration
6010 before, copy the arg type info from that prototype.
6011 But not if what we had before was a builtin function. */
6012 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6013 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6014 && !DECL_BUILT_IN (old_decl)
6015 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6016 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6017 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6019 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6020 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6021 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6024 /* If there is no explicit declaration, look for any out-of-scope implicit
6027 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6029 /* Optionally warn of old-fashioned def with no previous prototype. */
6030 if (warn_strict_prototypes
6031 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6033 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6034 || (DECL_BUILT_IN (old_decl)
6035 && ! C_DECL_ANTICIPATED (old_decl)))))
6036 warning ("function declaration isn't a prototype");
6037 /* Optionally warn of any global def with no previous prototype. */
6038 else if (warn_missing_prototypes
6039 && TREE_PUBLIC (decl1)
6041 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6042 || (DECL_BUILT_IN (old_decl)
6043 && ! C_DECL_ANTICIPATED (old_decl))))
6044 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6045 warning_with_decl (decl1, "no previous prototype for `%s'");
6046 /* Optionally warn of any def with no previous prototype
6047 if the function has already been used. */
6048 else if (warn_missing_prototypes
6049 && old_decl != 0 && TREE_USED (old_decl)
6050 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6051 warning_with_decl (decl1,
6052 "`%s' was used with no prototype before its definition");
6053 /* Optionally warn of any global def with no previous declaration. */
6054 else if (warn_missing_declarations
6055 && TREE_PUBLIC (decl1)
6057 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6058 warning_with_decl (decl1, "no previous declaration for `%s'");
6059 /* Optionally warn of any def with no previous declaration
6060 if the function has already been used. */
6061 else if (warn_missing_declarations
6062 && old_decl != 0 && TREE_USED (old_decl)
6063 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6064 warning_with_decl (decl1,
6065 "`%s' was used with no declaration before its definition");
6067 /* This is a definition, not a reference.
6068 So normally clear DECL_EXTERNAL.
6069 However, `extern inline' acts like a declaration
6070 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6071 DECL_EXTERNAL (decl1) = current_extern_inline;
6073 /* This function exists in static storage.
6074 (This does not mean `static' in the C sense!) */
6075 TREE_STATIC (decl1) = 1;
6077 /* A nested function is not global. */
6078 if (current_function_decl != 0)
6079 TREE_PUBLIC (decl1) = 0;
6081 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6082 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6087 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6088 != integer_type_node)
6089 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6091 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6092 args = TREE_CHAIN (args))
6094 tree type = args ? TREE_VALUE (args) : 0;
6096 if (type == void_type_node)
6103 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6104 pedwarn_with_decl (decl1,
6105 "first argument of `%s' should be `int'");
6109 if (TREE_CODE (type) != POINTER_TYPE
6110 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6111 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6113 pedwarn_with_decl (decl1,
6114 "second argument of `%s' should be `char **'");
6118 if (TREE_CODE (type) != POINTER_TYPE
6119 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6120 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6122 pedwarn_with_decl (decl1,
6123 "third argument of `%s' should probably be `char **'");
6128 /* It is intentional that this message does not mention the third
6129 argument because it's only mentioned in an appendix of the
6131 if (argct > 0 && (argct < 2 || argct > 3))
6132 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6134 if (! TREE_PUBLIC (decl1))
6135 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6138 /* Record the decl so that the function name is defined.
6139 If we already have a decl for this name, and it is a FUNCTION_DECL,
6140 use the old decl. */
6142 current_function_decl = pushdecl (decl1);
6145 declare_parm_level (1);
6146 current_binding_level->subblocks_tag_transparent = 1;
6148 make_decl_rtl (current_function_decl, NULL);
6150 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6151 /* Promote the value to int before returning it. */
6152 if (c_promoting_integer_type_p (restype))
6154 /* It retains unsignedness if traditional
6155 or if not really getting wider. */
6156 if (TREE_UNSIGNED (restype)
6157 && (flag_traditional
6158 || (TYPE_PRECISION (restype)
6159 == TYPE_PRECISION (integer_type_node))))
6160 restype = unsigned_type_node;
6162 restype = integer_type_node;
6164 DECL_RESULT (current_function_decl)
6165 = build_decl (RESULT_DECL, NULL_TREE, restype);
6167 /* If this fcn was already referenced via a block-scope `extern' decl
6168 (or an implicit decl), propagate certain information about the usage. */
6169 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6170 TREE_ADDRESSABLE (current_function_decl) = 1;
6172 immediate_size_expand = old_immediate_size_expand;
6174 start_fname_decls ();
6179 /* Record that this function is going to be a varargs function.
6180 This is called before store_parm_decls, which is too early
6181 to call mark_varargs directly. */
6186 c_function_varargs = 1;
6189 /* Store the parameter declarations into the current function declaration.
6190 This is called after parsing the parameter declarations, before
6191 digesting the body of the function.
6193 For an old-style definition, modify the function's type
6194 to specify at least the number of arguments. */
6199 register tree fndecl = current_function_decl;
6202 /* This is either a chain of PARM_DECLs (if a prototype was used)
6203 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6204 tree specparms = current_function_parms;
6206 /* This is a list of types declared among parms in a prototype. */
6207 tree parmtags = current_function_parm_tags;
6209 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6210 register tree parmdecls = getdecls ();
6212 /* This is a chain of any other decls that came in among the parm
6213 declarations. If a parm is declared with enum {foo, bar} x;
6214 then CONST_DECLs for foo and bar are put here. */
6217 /* Nonzero if this definition is written with a prototype. */
6220 /* The function containing FNDECL, if any. */
6221 tree context = decl_function_context (fndecl);
6223 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6225 /* This case is when the function was defined with an ANSI prototype.
6226 The parms already have decls, so we need not do anything here
6227 except record them as in effect
6228 and complain if any redundant old-style parm decls were written. */
6239 error_with_decl (fndecl,
6240 "parm types given both in parmlist and separately");
6241 /* Get rid of the erroneous decls; don't keep them on
6242 the list of parms, since they might not be PARM_DECLs. */
6243 for (decl = current_binding_level->names;
6244 decl; decl = TREE_CHAIN (decl))
6245 if (DECL_NAME (decl))
6246 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6247 for (link = current_binding_level->shadowed;
6248 link; link = TREE_CHAIN (link))
6249 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6250 current_binding_level->names = 0;
6251 current_binding_level->shadowed = 0;
6254 specparms = nreverse (specparms);
6255 for (parm = specparms; parm; parm = next)
6257 next = TREE_CHAIN (parm);
6258 if (TREE_CODE (parm) == PARM_DECL)
6260 if (DECL_NAME (parm) == 0)
6261 error_with_decl (parm, "parameter name omitted");
6262 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6263 && VOID_TYPE_P (TREE_TYPE (parm)))
6265 error_with_decl (parm, "parameter `%s' declared void");
6266 /* Change the type to error_mark_node so this parameter
6267 will be ignored by assign_parms. */
6268 TREE_TYPE (parm) = error_mark_node;
6274 /* If we find an enum constant or a type tag,
6275 put it aside for the moment. */
6276 TREE_CHAIN (parm) = 0;
6277 others = chainon (others, parm);
6281 /* Get the decls in their original chain order
6282 and record in the function. */
6283 DECL_ARGUMENTS (fndecl) = getdecls ();
6286 /* If this function takes a variable number of arguments,
6287 add a phony parameter to the end of the parm list,
6288 to represent the position of the first unnamed argument. */
6289 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6292 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6293 /* Let's hope the address of the unnamed parm
6294 won't depend on its type. */
6295 TREE_TYPE (dummy) = integer_type_node;
6296 DECL_ARG_TYPE (dummy) = integer_type_node;
6297 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6301 /* Now pushdecl the enum constants. */
6302 for (parm = others; parm; parm = next)
6304 next = TREE_CHAIN (parm);
6305 if (DECL_NAME (parm) == 0)
6307 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6309 else if (TREE_CODE (parm) != PARM_DECL)
6313 storetags (chainon (parmtags, gettags ()));
6317 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6318 each with a parm name as the TREE_VALUE.
6320 PARMDECLS is a chain of declarations for parameters.
6321 Warning! It can also contain CONST_DECLs which are not parameters
6322 but are names of enumerators of any enum types
6323 declared among the parameters.
6325 First match each formal parameter name with its declaration.
6326 Associate decls with the names and store the decls
6327 into the TREE_PURPOSE slots. */
6329 /* We use DECL_WEAK as a flag to show which parameters have been
6330 seen already since it is not used on PARM_DECL or CONST_DECL. */
6331 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6332 DECL_WEAK (parm) = 0;
6334 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6336 register tree tail, found = NULL;
6338 if (TREE_VALUE (parm) == 0)
6340 error_with_decl (fndecl,
6341 "parameter name missing from parameter list");
6342 TREE_PURPOSE (parm) = 0;
6346 /* See if any of the parmdecls specifies this parm by name.
6347 Ignore any enumerator decls. */
6348 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6349 if (DECL_NAME (tail) == TREE_VALUE (parm)
6350 && TREE_CODE (tail) == PARM_DECL)
6356 /* If declaration already marked, we have a duplicate name.
6357 Complain, and don't use this decl twice. */
6358 if (found && DECL_WEAK (found))
6360 error_with_decl (found, "multiple parameters named `%s'");
6364 /* If the declaration says "void", complain and ignore it. */
6365 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6367 error_with_decl (found, "parameter `%s' declared void");
6368 TREE_TYPE (found) = integer_type_node;
6369 DECL_ARG_TYPE (found) = integer_type_node;
6370 layout_decl (found, 0);
6373 /* Traditionally, a parm declared float is actually a double. */
6374 if (found && flag_traditional
6375 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6377 TREE_TYPE (found) = double_type_node;
6378 DECL_ARG_TYPE (found) = double_type_node;
6379 layout_decl (found, 0);
6382 /* If no declaration found, default to int. */
6385 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6387 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6388 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6389 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6391 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6392 else if (extra_warnings)
6393 warning_with_decl (found, "type of `%s' defaults to `int'");
6397 TREE_PURPOSE (parm) = found;
6399 /* Mark this decl as "already found". */
6400 DECL_WEAK (found) = 1;
6403 /* Put anything which is on the parmdecls chain and which is
6404 not a PARM_DECL onto the list NONPARMS. (The types of
6405 non-parm things which might appear on the list include
6406 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6407 any actual PARM_DECLs not matched with any names. */
6410 for (parm = parmdecls; parm;)
6412 tree next = TREE_CHAIN (parm);
6413 TREE_CHAIN (parm) = 0;
6415 if (TREE_CODE (parm) != PARM_DECL)
6416 nonparms = chainon (nonparms, parm);
6419 /* Complain about args with incomplete types. */
6420 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6422 error_with_decl (parm, "parameter `%s' has incomplete type");
6423 TREE_TYPE (parm) = error_mark_node;
6426 if (! DECL_WEAK (parm))
6428 error_with_decl (parm,
6429 "declaration for parameter `%s' but no such parameter");
6430 /* Pretend the parameter was not missing.
6431 This gets us to a standard state and minimizes
6432 further error messages. */
6434 = chainon (specparms,
6435 tree_cons (parm, NULL_TREE, NULL_TREE));
6442 /* Chain the declarations together in the order of the list of
6443 names. Store that chain in the function decl, replacing the
6446 DECL_ARGUMENTS (fndecl) = 0;
6449 for (last = 0; parm; parm = TREE_CHAIN (parm))
6450 if (TREE_PURPOSE (parm))
6453 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6455 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6456 last = TREE_PURPOSE (parm);
6457 TREE_CHAIN (last) = 0;
6461 /* If there was a previous prototype,
6462 set the DECL_ARG_TYPE of each argument according to
6463 the type previously specified, and report any mismatches. */
6465 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6468 for (parm = DECL_ARGUMENTS (fndecl),
6469 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6470 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6471 != void_type_node));
6472 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6474 if (parm == 0 || type == 0
6475 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6477 error ("number of arguments doesn't match prototype");
6478 error_with_file_and_line (current_function_prototype_file,
6479 current_function_prototype_line,
6480 "prototype declaration");
6483 /* Type for passing arg must be consistent with that
6484 declared for the arg. ISO C says we take the unqualified
6485 type for parameters declared with qualified type. */
6486 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6487 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6489 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6490 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6492 /* Adjust argument to match prototype. E.g. a previous
6493 `int foo(float);' prototype causes
6494 `int foo(x) float x; {...}' to be treated like
6495 `int foo(float x) {...}'. This is particularly
6496 useful for argument types like uid_t. */
6497 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6499 if (PROMOTE_PROTOTYPES
6500 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6501 && TYPE_PRECISION (TREE_TYPE (parm))
6502 < TYPE_PRECISION (integer_type_node))
6503 DECL_ARG_TYPE (parm) = integer_type_node;
6507 pedwarn ("promoted argument `%s' doesn't match prototype",
6508 IDENTIFIER_POINTER (DECL_NAME (parm)));
6509 warning_with_file_and_line
6510 (current_function_prototype_file,
6511 current_function_prototype_line,
6512 "prototype declaration");
6515 /* If -traditional, allow `int' argument to match
6516 `unsigned' prototype. */
6517 else if (! (flag_traditional
6518 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6519 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6521 error ("argument `%s' doesn't match prototype",
6522 IDENTIFIER_POINTER (DECL_NAME (parm)));
6523 error_with_file_and_line (current_function_prototype_file,
6524 current_function_prototype_line,
6525 "prototype declaration");
6529 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6532 /* Otherwise, create a prototype that would match. */
6536 tree actual = 0, last = 0, type;
6538 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6540 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6542 TREE_CHAIN (last) = type;
6547 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6549 TREE_CHAIN (last) = type;
6553 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6554 of the type of this function, but we need to avoid having this
6555 affect the types of other similarly-typed functions, so we must
6556 first force the generation of an identical (but separate) type
6557 node for the relevant function type. The new node we create
6558 will be a variant of the main variant of the original function
6561 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6563 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6566 /* Now store the final chain of decls for the arguments
6567 as the decl-chain of the current lexical scope.
6568 Put the enumerators in as well, at the front so that
6569 DECL_ARGUMENTS is not modified. */
6571 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6574 /* Make sure the binding level for the top of the function body
6575 gets a BLOCK if there are any in the function.
6576 Otherwise, the dbx output is wrong. */
6578 keep_next_if_subblocks = 1;
6580 /* ??? This might be an improvement,
6581 but needs to be thought about some more. */
6583 keep_next_level_flag = 1;
6586 /* Write a record describing this function definition to the prototypes
6587 file (if requested). */
6589 gen_aux_info_record (fndecl, 1, 0, prototype);
6591 /* Initialize the RTL code for the function. */
6592 init_function_start (fndecl, input_filename, lineno);
6594 /* Begin the statement tree for this function. */
6595 DECL_LANG_SPECIFIC (current_function_decl)
6596 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6597 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6599 /* If this is a nested function, save away the sizes of any
6600 variable-size types so that we can expand them when generating
6606 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6607 = nreverse (get_pending_sizes ());
6608 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6611 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6614 /* This function is being processed in whole-function mode. */
6615 cfun->x_whole_function_mode_p = 1;
6617 /* Even though we're inside a function body, we still don't want to
6618 call expand_expr to calculate the size of a variable-sized array.
6619 We haven't necessarily assigned RTL to all variables yet, so it's
6620 not safe to try to expand expressions involving them. */
6621 immediate_size_expand = 0;
6622 cfun->x_dont_save_pending_sizes_p = 1;
6625 /* Finish up a function declaration and compile that function
6626 all the way to assembler language output. The free the storage
6627 for the function definition.
6629 This is called after parsing the body of the function definition.
6631 NESTED is nonzero if the function being finished is nested in another. */
6634 finish_function (nested)
6637 register tree fndecl = current_function_decl;
6639 /* TREE_READONLY (fndecl) = 1;
6640 This caused &foo to be of type ptr-to-const-function
6641 which then got a warning when stored in a ptr-to-function variable. */
6644 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6646 /* Must mark the RESULT_DECL as being in this function. */
6648 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6650 /* Obey `register' declarations if `setjmp' is called in this fn. */
6651 if (flag_traditional && current_function_calls_setjmp)
6653 setjmp_protect (DECL_INITIAL (fndecl));
6654 setjmp_protect_args ();
6657 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6659 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6660 != integer_type_node)
6662 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6663 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6665 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6669 #ifdef DEFAULT_MAIN_RETURN
6670 /* Make it so that `main' always returns success by default. */
6671 DEFAULT_MAIN_RETURN;
6674 c_expand_return (integer_zero_node);
6679 finish_fname_decls ();
6681 /* Tie off the statement tree for this function. */
6682 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6683 /* Clear out memory we no longer need. */
6684 free_after_parsing (cfun);
6685 /* Since we never call rest_of_compilation, we never clear
6686 CFUN. Do so explicitly. */
6687 free_after_compilation (cfun);
6692 /* Generate RTL for the body of this function. */
6693 c_expand_body (fndecl, nested);
6694 /* Let the error reporting routines know that we're outside a
6695 function. For a nested function, this value is used in
6696 pop_c_function_context and then reset via pop_function_context. */
6697 current_function_decl = NULL;
6701 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6702 then we are already in the process of generating RTL for another
6706 c_expand_body (fndecl, nested_p)
6710 /* There's no reason to do any of the work here if we're only doing
6711 semantic analysis; this code just generates RTL. */
6712 if (flag_syntax_only)
6717 /* Make sure that we will evaluate variable-sized types involved
6718 in our function's type. */
6719 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6720 /* Squirrel away our current state. */
6721 push_function_context ();
6724 /* Initialize the RTL code for the function. */
6725 current_function_decl = fndecl;
6726 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6728 /* This function is being processed in whole-function mode. */
6729 cfun->x_whole_function_mode_p = 1;
6731 /* Even though we're inside a function body, we still don't want to
6732 call expand_expr to calculate the size of a variable-sized array.
6733 We haven't necessarily assigned RTL to all variables yet, so it's
6734 not safe to try to expand expressions involving them. */
6735 immediate_size_expand = 0;
6736 cfun->x_dont_save_pending_sizes_p = 1;
6738 /* If this is a varargs function, inform function.c. */
6739 if (c_function_varargs)
6742 /* Set up parameters and prepare for return, for the function. */
6743 expand_function_start (fndecl, 0);
6745 /* If this function is `main', emit a call to `__main'
6746 to run global initializers, etc. */
6747 if (DECL_NAME (fndecl)
6748 && MAIN_NAME_P (DECL_NAME (fndecl))
6749 && DECL_CONTEXT (fndecl) == NULL_TREE)
6750 expand_main_function ();
6752 /* Generate the RTL for this function. */
6753 expand_stmt (DECL_SAVED_TREE (fndecl));
6754 /* Allow the body of the function to be garbage collected. */
6755 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6757 /* We hard-wired immediate_size_expand to zero above.
6758 expand_function_end will decrement this variable. So, we set the
6759 variable to one here, so that after the decrement it will remain
6761 immediate_size_expand = 1;
6763 /* Allow language dialects to perform special processing. */
6764 if (lang_expand_function_end)
6765 (*lang_expand_function_end) ();
6767 /* Generate rtl for function exit. */
6768 expand_function_end (input_filename, lineno, 0);
6770 /* If this is a nested function, protect the local variables in the stack
6771 above us from being collected while we're compiling this function. */
6773 ggc_push_context ();
6775 /* Run the optimizers and output the assembler code for this function. */
6776 rest_of_compilation (fndecl);
6778 /* Undo the GC context switch. */
6782 /* With just -W, complain only if function returns both with
6783 and without a value. */
6785 && current_function_returns_value
6786 && current_function_returns_null)
6787 warning ("this function may return with or without a value");
6789 /* If requested, warn about function definitions where the function will
6790 return a value (usually of some struct or union type) which itself will
6791 take up a lot of stack space. */
6793 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6795 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6797 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6798 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6799 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6802 unsigned int size_as_int
6803 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6805 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6806 warning_with_decl (fndecl,
6807 "size of return value of `%s' is %u bytes",
6810 warning_with_decl (fndecl,
6811 "size of return value of `%s' is larger than %d bytes",
6816 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6818 /* Stop pointing to the local nodes about to be freed.
6819 But DECL_INITIAL must remain nonzero so we know this
6820 was an actual function definition.
6821 For a nested function, this is done in pop_c_function_context.
6822 If rest_of_compilation set this to 0, leave it 0. */
6823 if (DECL_INITIAL (fndecl) != 0)
6824 DECL_INITIAL (fndecl) = error_mark_node;
6826 DECL_ARGUMENTS (fndecl) = 0;
6829 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6831 if (targetm.have_ctors_dtors)
6832 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6833 DEFAULT_INIT_PRIORITY);
6835 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6838 if (DECL_STATIC_DESTRUCTOR (fndecl))
6840 if (targetm.have_ctors_dtors)
6841 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6842 DEFAULT_INIT_PRIORITY);
6844 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6848 /* Return to the enclosing function. */
6849 pop_function_context ();
6852 /* Check the declarations given in a for-loop for satisfying the C99
6855 check_for_loop_decls ()
6861 /* If we get here, declarations have been used in a for loop without
6862 the C99 for loop scope. This doesn't make much sense, so don't
6864 error ("`for' loop initial declaration used outside C99 mode");
6867 /* C99 subclause 6.8.5 paragraph 3:
6869 [#3] The declaration part of a for statement shall only
6870 declare identifiers for objects having storage class auto or
6873 It isn't clear whether, in this sentence, "identifiers" binds to
6874 "shall only declare" or to "objects" - that is, whether all identifiers
6875 declared must be identifiers for objects, or whether the restriction
6876 only applies to those that are. (A question on this in comp.std.c
6877 in November 2000 received no answer.) We implement the strictest
6878 interpretation, to avoid creating an extension which later causes
6881 for (t = gettags (); t; t = TREE_CHAIN (t))
6883 if (TREE_PURPOSE (t) != 0)
6884 error ("`%s %s' declared in `for' loop initial declaration",
6885 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6886 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6888 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6890 for (t = getdecls (); t; t = TREE_CHAIN (t))
6892 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6893 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6894 else if (TREE_STATIC (t))
6895 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6896 else if (DECL_EXTERNAL (t))
6897 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6901 /* Save and restore the variables in this file and elsewhere
6902 that keep track of the progress of compilation of the current function.
6903 Used for nested functions. */
6905 struct c_language_function
6907 struct language_function base;
6909 tree shadowed_labels;
6912 int warn_about_return_type;
6914 struct binding_level *binding_level;
6917 /* Save and reinitialize the variables
6918 used during compilation of a C function. */
6921 push_c_function_context (f)
6924 struct c_language_function *p;
6925 p = ((struct c_language_function *)
6926 xmalloc (sizeof (struct c_language_function)));
6927 f->language = (struct language_function *) p;
6929 p->base.x_stmt_tree = c_stmt_tree;
6930 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6931 p->named_labels = named_labels;
6932 p->shadowed_labels = shadowed_labels;
6933 p->returns_value = current_function_returns_value;
6934 p->returns_null = current_function_returns_null;
6935 p->warn_about_return_type = warn_about_return_type;
6936 p->extern_inline = current_extern_inline;
6937 p->binding_level = current_binding_level;
6940 /* Restore the variables used during compilation of a C function. */
6943 pop_c_function_context (f)
6946 struct c_language_function *p
6947 = (struct c_language_function *) f->language;
6950 /* Bring back all the labels that were shadowed. */
6951 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6952 if (DECL_NAME (TREE_VALUE (link)) != 0)
6953 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6954 = TREE_VALUE (link);
6956 if (DECL_SAVED_INSNS (current_function_decl) == 0
6957 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6959 /* Stop pointing to the local nodes about to be freed. */
6960 /* But DECL_INITIAL must remain nonzero so we know this
6961 was an actual function definition. */
6962 DECL_INITIAL (current_function_decl) = error_mark_node;
6963 DECL_ARGUMENTS (current_function_decl) = 0;
6966 c_stmt_tree = p->base.x_stmt_tree;
6967 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6968 named_labels = p->named_labels;
6969 shadowed_labels = p->shadowed_labels;
6970 current_function_returns_value = p->returns_value;
6971 current_function_returns_null = p->returns_null;
6972 warn_about_return_type = p->warn_about_return_type;
6973 current_extern_inline = p->extern_inline;
6974 current_binding_level = p->binding_level;
6980 /* Mark the language specific parts of F for GC. */
6983 mark_c_function_context (f)
6986 struct c_language_function *p
6987 = (struct c_language_function *) f->language;
6992 mark_c_language_function (&p->base);
6993 ggc_mark_tree (p->shadowed_labels);
6994 ggc_mark_tree (p->named_labels);
6995 mark_binding_level (&p->binding_level);
6998 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7001 copy_lang_decl (decl)
7004 struct lang_decl *ld;
7006 if (!DECL_LANG_SPECIFIC (decl))
7009 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7010 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7011 sizeof (struct lang_decl));
7012 DECL_LANG_SPECIFIC (decl) = ld;
7015 /* Mark the language specific bits in T for GC. */
7021 if (TREE_CODE (t) == IDENTIFIER_NODE)
7023 struct lang_identifier *i = (struct lang_identifier *) t;
7024 ggc_mark_tree (i->global_value);
7025 ggc_mark_tree (i->local_value);
7026 ggc_mark_tree (i->label_value);
7027 ggc_mark_tree (i->implicit_decl);
7028 ggc_mark_tree (i->error_locus);
7029 ggc_mark_tree (i->limbo_value);
7031 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7032 ggc_mark (TYPE_LANG_SPECIFIC (t));
7033 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7035 ggc_mark (DECL_LANG_SPECIFIC (t));
7036 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7037 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7041 /* The functions below are required for functionality of doing
7042 function at once processing in the C front end. Currently these
7043 functions are not called from anywhere in the C front end, but as
7044 these changes continue, that will change. */
7046 /* Returns non-zero if the current statement is a full expression,
7047 i.e. temporaries created during that statement should be destroyed
7048 at the end of the statement. */
7051 stmts_are_full_exprs_p ()
7056 /* Returns the stmt_tree (if any) to which statements are currently
7057 being added. If there is no active statement-tree, NULL is
7061 current_stmt_tree ()
7063 return &c_stmt_tree;
7066 /* Returns the stack of SCOPE_STMTs for the current function. */
7069 current_scope_stmt_stack ()
7071 return &c_scope_stmt_stack;
7074 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7078 anon_aggr_type_p (node)
7079 tree node ATTRIBUTE_UNUSED;
7084 /* Dummy function in place of callback used by C++. */
7087 extract_interface_info ()
7091 /* Return a new COMPOUND_STMT, after adding it to the current
7095 c_begin_compound_stmt ()
7099 /* Create the COMPOUND_STMT. */
7100 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7105 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7109 c_expand_decl_stmt (t)
7112 tree decl = DECL_STMT_DECL (t);
7114 /* Expand nested functions. */
7115 if (TREE_CODE (decl) == FUNCTION_DECL
7116 && DECL_CONTEXT (decl) == current_function_decl
7117 && DECL_SAVED_TREE (decl))
7118 c_expand_body (decl, /*nested_p=*/1);
7121 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7122 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7125 identifier_global_value (t)
7128 return IDENTIFIER_GLOBAL_VALUE (t);
7131 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7132 otherwise the name is found in ridpointers from RID_INDEX. */
7135 record_builtin_type (rid_index, name, type)
7142 id = ridpointers[(int) rid_index];
7144 id = get_identifier (name);
7145 pushdecl (build_decl (TYPE_DECL, id, type));
7148 /* Build the void_list_node (void_type_node having been created). */
7150 build_void_list_node ()
7152 tree t = build_tree_list (NULL_TREE, void_type_node);