1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL
, /* Ordinary declaration */
49 FUNCDEF
, /* Function definition */
50 PARM
, /* Declaration of parm before function body */
51 FIELD
, /* Declaration inside struct or union */
52 BITFIELD
, /* Likewise but with specified width */
53 TYPENAME
}; /* Typename (inside cast or sizeof) */
55 /* We let tm.h override the types used here, to handle trivial differences
56 such as the choice of unsigned int or long unsigned int for size_t.
57 When machines start needing nontrivial differences in the size type,
58 it would be best to do something here to figure out automatically
59 from other information what type to use. */
62 #define SIZE_TYPE "long unsigned int"
66 #define WCHAR_TYPE "int"
70 /* Nonzero if we have seen an invalid cross reference
71 to a struct, union, or enum, but not yet printed the message. */
73 tree pending_invalid_xref
;
74 /* File and line to appear in the eventual error message. */
75 const char *pending_invalid_xref_file
;
76 int pending_invalid_xref_line
;
78 /* While defining an enum type, this is 1 plus the last enumerator
79 constant value. Note that will do not have to save this or `enum_overflow'
80 around nested function definition since such a definition could only
81 occur in an enum value expression and we don't use these variables in
84 static tree enum_next_value
;
86 /* Nonzero means that there was overflow computing enum_next_value. */
88 static int enum_overflow
;
90 /* Parsing a function declarator leaves a list of parameter names
91 or a chain or parameter decls here. */
93 static tree last_function_parms
;
95 /* Parsing a function declarator leaves here a chain of structure
96 and enum types declared in the parmlist. */
98 static tree last_function_parm_tags
;
100 /* After parsing the declarator that starts a function definition,
101 `start_function' puts here the list of parameter names or chain of decls.
102 `store_parm_decls' finds it here. */
104 static tree current_function_parms
;
106 /* Similar, for last_function_parm_tags. */
107 static tree current_function_parm_tags
;
109 /* Similar, for the file and line that the prototype came from if this is
110 an old-style definition. */
111 static const char *current_function_prototype_file
;
112 static int current_function_prototype_line
;
114 /* The current statement tree. */
116 static struct stmt_tree_s c_stmt_tree
;
118 /* The current scope statement stack. */
120 static tree c_scope_stmt_stack
;
122 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
125 static int c_function_name_declared_p
;
127 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
128 that have names. Here so we can clear out their names' definitions
129 at the end of the function. */
131 static tree named_labels
;
133 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
135 static tree shadowed_labels
;
137 /* Nonzero when store_parm_decls is called indicates a varargs function.
138 Value not meaningful after store_parm_decls. */
140 static int c_function_varargs
;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement that specifies a return value is seen. */
145 int current_function_returns_value
;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a return statement with no argument is seen. */
150 int current_function_returns_null
;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type
;
157 /* Nonzero when starting a function declared `extern inline'. */
159 static int current_extern_inline
;
161 /* For each binding contour we allocate a binding_level structure
162 * which records the names defined in that contour.
165 * 1) one for each function definition,
166 * where internal declarations of the parameters appear.
167 * 2) one for each compound statement,
168 * to record its declarations.
170 * The current meaning of a name can be found by searching the levels from
171 * the current one out to the global one.
174 /* Note that the information in the `names' component of the global contour
175 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
179 /* A chain of _DECL nodes for all variables, constants, functions,
180 and typedef types. These are in the reverse of the order supplied.
184 /* A list of structure, union and enum definitions,
185 * for looking up tag names.
186 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
187 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
188 * or ENUMERAL_TYPE node.
192 /* For each level, a list of shadowed outer-level local definitions
193 to be restored when this level is popped.
194 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
195 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
198 /* For each level (except not the global one),
199 a chain of BLOCK nodes for all the levels
200 that were entered and exited one level down. */
203 /* The BLOCK node for this level, if one has been preallocated.
204 If 0, the BLOCK is allocated (if needed) when the level is popped. */
207 /* The binding level which this one is contained in (inherits from). */
208 struct binding_level
*level_chain
;
210 /* Nonzero for the level that holds the parameters of a function. */
213 /* Nonzero if this level "doesn't exist" for tags. */
214 char tag_transparent
;
216 /* Nonzero if sublevels of this level "don't exist" for tags.
217 This is set in the parm level of a function definition
218 while reading the function body, so that the outermost block
219 of the function body will be tag-transparent. */
220 char subblocks_tag_transparent
;
222 /* Nonzero means make a BLOCK for this level regardless of all else. */
225 /* Nonzero means make a BLOCK if this level has any subblocks. */
226 char keep_if_subblocks
;
228 /* Number of decls in `names' that have incomplete
229 structure or union types. */
232 /* A list of decls giving the (reversed) specified order of parms,
233 not including any forward-decls in the parmlist.
234 This is so we can put the parms in proper order for assign_parms. */
238 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
240 /* The binding level currently in effect. */
242 static struct binding_level
*current_binding_level
;
244 /* A chain of binding_level structures awaiting reuse. */
246 static struct binding_level
*free_binding_level
;
248 /* The outermost binding level, for names of file scope.
249 This is created when the compiler is started and exists
250 through the entire run. */
252 static struct binding_level
*global_binding_level
;
254 /* Binding level structures are initialized by copying this one. */
256 static struct binding_level clear_binding_level
257 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
260 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
262 static int keep_next_level_flag
;
264 /* Nonzero means make a BLOCK for the next level pushed
265 if it has subblocks. */
267 static int keep_next_if_subblocks
;
269 /* The chain of outer levels of label scopes.
270 This uses the same data structure used for binding levels,
271 but it works differently: each link in the chain records
272 saved values of named_labels and shadowed_labels for
273 a label binding level outside the current one. */
275 static struct binding_level
*label_level_chain
;
277 /* Functions called automatically at the beginning and end of execution. */
279 tree static_ctors
, static_dtors
;
281 /* Forward declarations. */
283 static struct binding_level
* make_binding_level
PARAMS ((void));
284 static void mark_binding_level
PARAMS ((void *));
285 static void clear_limbo_values
PARAMS ((tree
));
286 static int duplicate_decls
PARAMS ((tree
, tree
, int));
287 static int redeclaration_error_message
PARAMS ((tree
, tree
));
288 static void storedecls
PARAMS ((tree
));
289 static void storetags
PARAMS ((tree
));
290 static tree lookup_tag
PARAMS ((enum tree_code
, tree
,
291 struct binding_level
*, int));
292 static tree lookup_tag_reverse
PARAMS ((tree
));
293 static tree grokdeclarator
PARAMS ((tree
, tree
, enum decl_context
,
295 static tree grokparms
PARAMS ((tree
, int));
296 static void layout_array_type
PARAMS ((tree
));
297 static tree c_make_fname_decl
PARAMS ((tree
, const char *, int));
298 static void c_expand_body
PARAMS ((tree
, int));
300 /* C-specific option variables. */
302 /* Nonzero means allow type mismatches in conditional expressions;
303 just make their values `void'. */
305 int flag_cond_mismatch
;
307 /* Nonzero means give `double' the same size as `float'. */
309 int flag_short_double
;
311 /* Nonzero means give `wchar_t' the same size as `short'. */
313 int flag_short_wchar
;
315 /* Nonzero means don't recognize the keyword `asm'. */
319 /* Nonzero means do some things the same way PCC does. */
321 int flag_traditional
;
323 /* Nonzero means enable C89 Amendment 1 features. */
327 /* Nonzero means use the ISO C99 dialect of C. */
331 /* Nonzero means that we have builtin functions, and main is an int */
335 /* Nonzero means add default format_arg attributes for functions not
338 int flag_noniso_default_format_attributes
= 1;
340 /* Nonzero means to allow single precision math even if we're generally
341 being traditional. */
342 int flag_allow_single_precision
= 0;
344 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
346 int flag_signed_bitfields
= 1;
347 int explicit_flag_signed_bitfields
= 0;
349 /* Nonzero means warn about use of implicit int. */
351 int warn_implicit_int
;
353 /* Nonzero means warn about usage of long long when `-pedantic'. */
355 int warn_long_long
= 1;
357 /* Nonzero means message about use of implicit function declarations;
358 1 means warning; 2 means error. */
360 int mesg_implicit_function_declaration
= -1;
362 /* Nonzero means give string constants the type `const char *'
363 to get extra warnings from them. These warnings will be too numerous
364 to be useful, except in thoroughly ANSIfied programs. */
366 int flag_const_strings
;
368 /* Nonzero means warn about pointer casts that can drop a type qualifier
369 from the pointer target type. */
373 /* Nonzero means warn when casting a function call to a type that does
374 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
375 when there is no previous declaration of sqrt or malloc. */
377 int warn_bad_function_cast
;
379 /* Warn about functions which might be candidates for format attributes. */
381 int warn_missing_format_attribute
;
383 /* Warn about traditional constructs whose meanings changed in ANSI C. */
385 int warn_traditional
;
387 /* Nonzero means warn about sizeof(function) or addition/subtraction
388 of function pointers. */
390 int warn_pointer_arith
;
392 /* Nonzero means warn for non-prototype function decls
393 or non-prototyped defs without previous prototype. */
395 int warn_strict_prototypes
;
397 /* Nonzero means warn for any global function def
398 without separate previous prototype decl. */
400 int warn_missing_prototypes
;
402 /* Nonzero means warn for any global function def
403 without separate previous decl. */
405 int warn_missing_declarations
;
407 /* Nonzero means warn about multiple (redundant) decls for the same single
408 variable or function. */
410 int warn_redundant_decls
= 0;
412 /* Nonzero means warn about extern declarations of objects not at
413 file-scope level and about *all* declarations of functions (whether
414 extern or static) not at file-scope level. Note that we exclude
415 implicit function declarations. To get warnings about those, use
418 int warn_nested_externs
= 0;
420 /* Warn about a subscript that has type char. */
422 int warn_char_subscripts
= 0;
424 /* Warn if a type conversion is done that might have confusing results. */
428 /* Warn if adding () is suggested. */
430 int warn_parentheses
;
432 /* Warn if initializer is not completely bracketed. */
434 int warn_missing_braces
;
436 /* Warn if main is suspicious. */
440 /* Warn about #pragma directives that are not recognised. */
442 int warn_unknown_pragmas
= 0; /* Tri state variable. */
444 /* Warn about comparison of signed and unsigned values.
445 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
447 int warn_sign_compare
= -1;
449 /* Warn about testing equality of floating point numbers. */
451 int warn_float_equal
= 0;
453 /* Nonzero means warn about use of multicharacter literals. */
455 int warn_multichar
= 1;
457 /* The variant of the C language being processed. */
459 c_language_kind c_language
= clk_c
;
461 /* Nonzero means `$' can be in an identifier. */
463 #ifndef DOLLARS_IN_IDENTIFIERS
464 #define DOLLARS_IN_IDENTIFIERS 1
466 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
468 /* Decode the string P as a language-specific option for C.
469 Return the number of strings consumed. Should not complain
470 if it does not recognise the option. */
473 c_decode_option (argc
, argv
)
474 int argc ATTRIBUTE_UNUSED
;
477 int strings_processed
;
478 const char *option_value
= NULL
;
481 strings_processed
= cpp_handle_option (parse_in
, argc
, argv
);
483 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
485 flag_traditional
= 1;
486 flag_writable_strings
= 1;
488 else if (!strcmp (p
, "-fallow-single-precision"))
489 flag_allow_single_precision
= 1;
490 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
495 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
499 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
503 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
505 flag_traditional
= 0;
506 flag_writable_strings
= 0;
508 else if (!strncmp (p
, "-std=", 5))
510 /* Select the appropriate language standard. We currently
512 -std=iso9899:1990 same as -ansi
513 -std=iso9899:199409 ISO C as modified in amend. 1
514 -std=iso9899:1999 ISO C 99
515 -std=c89 same as -std=iso9899:1990
516 -std=c99 same as -std=iso9899:1999
517 -std=gnu89 default, iso9899:1990 + gnu extensions
518 -std=gnu99 iso9899:1999 + gnu extensions
520 const char *argstart
= &p
[5];
522 if (!strcmp (argstart
, "iso9899:1990")
523 || !strcmp (argstart
, "c89"))
528 flag_traditional
= 0;
529 flag_writable_strings
= 0;
531 flag_no_nonansi_builtin
= 1;
532 flag_noniso_default_format_attributes
= 0;
535 else if (!strcmp (argstart
, "iso9899:199409"))
540 else if (!strcmp (argstart
, "iso9899:199x")
541 || !strcmp (argstart
, "iso9899:1999")
542 || !strcmp (argstart
, "c9x")
543 || !strcmp (argstart
, "c99"))
545 flag_traditional
= 0;
546 flag_writable_strings
= 0;
548 flag_no_nonansi_builtin
= 1;
549 flag_noniso_default_format_attributes
= 0;
553 else if (!strcmp (argstart
, "gnu89"))
555 flag_traditional
= 0;
556 flag_writable_strings
= 0;
558 flag_no_nonansi_builtin
= 0;
559 flag_noniso_default_format_attributes
= 1;
563 else if (!strcmp (argstart
, "gnu9x") || !strcmp (argstart
, "gnu99"))
565 flag_traditional
= 0;
566 flag_writable_strings
= 0;
568 flag_no_nonansi_builtin
= 0;
569 flag_noniso_default_format_attributes
= 1;
574 error ("unknown C standard `%s'", argstart
);
576 else if (!strcmp (p
, "-fdollars-in-identifiers"))
577 dollars_in_ident
= 1;
578 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
579 dollars_in_ident
= 0;
580 else if (!strcmp (p
, "-fsigned-char"))
581 flag_signed_char
= 1;
582 else if (!strcmp (p
, "-funsigned-char"))
583 flag_signed_char
= 0;
584 else if (!strcmp (p
, "-fno-signed-char"))
585 flag_signed_char
= 0;
586 else if (!strcmp (p
, "-fno-unsigned-char"))
587 flag_signed_char
= 1;
588 else if (!strcmp (p
, "-fsigned-bitfields")
589 || !strcmp (p
, "-fno-unsigned-bitfields"))
591 flag_signed_bitfields
= 1;
592 explicit_flag_signed_bitfields
= 1;
594 else if (!strcmp (p
, "-funsigned-bitfields")
595 || !strcmp (p
, "-fno-signed-bitfields"))
597 flag_signed_bitfields
= 0;
598 explicit_flag_signed_bitfields
= 1;
600 else if (!strcmp (p
, "-fshort-enums"))
601 flag_short_enums
= 1;
602 else if (!strcmp (p
, "-fno-short-enums"))
603 flag_short_enums
= 0;
604 else if (!strcmp (p
, "-fshort-wchar"))
605 flag_short_wchar
= 1;
606 else if (!strcmp (p
, "-fno-short-wchar"))
607 flag_short_wchar
= 0;
608 else if (!strcmp (p
, "-fcond-mismatch"))
609 flag_cond_mismatch
= 1;
610 else if (!strcmp (p
, "-fno-cond-mismatch"))
611 flag_cond_mismatch
= 0;
612 else if (!strcmp (p
, "-fshort-double"))
613 flag_short_double
= 1;
614 else if (!strcmp (p
, "-fno-short-double"))
615 flag_short_double
= 0;
616 else if (!strcmp (p
, "-fasm"))
618 else if (!strcmp (p
, "-fno-asm"))
620 else if (!strcmp (p
, "-fbuiltin"))
622 else if (!strcmp (p
, "-fno-builtin"))
624 else if ((option_value
625 = skip_leading_substring (p
, "-fdump-translation-unit-")))
628 error ("no file specified with -fdump-translation-unit");
630 flag_dump_translation_unit
= option_value
;
632 else if (!strcmp (p
, "-ansi"))
634 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
635 mesg_implicit_function_declaration
= 2;
636 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
637 mesg_implicit_function_declaration
= 1;
638 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
639 mesg_implicit_function_declaration
= 0;
640 else if (!strcmp (p
, "-Wimplicit-int"))
641 warn_implicit_int
= 1;
642 else if (!strcmp (p
, "-Wno-implicit-int"))
643 warn_implicit_int
= 0;
644 else if (!strcmp (p
, "-Wimplicit"))
646 warn_implicit_int
= 1;
647 if (mesg_implicit_function_declaration
!= 2)
648 mesg_implicit_function_declaration
= 1;
650 else if (!strcmp (p
, "-Wno-implicit"))
651 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
652 else if (!strcmp (p
, "-Wlong-long"))
654 else if (!strcmp (p
, "-Wno-long-long"))
656 else if (!strcmp (p
, "-Wwrite-strings"))
657 flag_const_strings
= 1;
658 else if (!strcmp (p
, "-Wno-write-strings"))
659 flag_const_strings
= 0;
660 else if (!strcmp (p
, "-Wcast-qual"))
662 else if (!strcmp (p
, "-Wno-cast-qual"))
664 else if (!strcmp (p
, "-Wbad-function-cast"))
665 warn_bad_function_cast
= 1;
666 else if (!strcmp (p
, "-Wno-bad-function-cast"))
667 warn_bad_function_cast
= 0;
668 else if (!strcmp (p
, "-Wno-missing-noreturn"))
669 warn_missing_noreturn
= 0;
670 else if (!strcmp (p
, "-Wmissing-format-attribute"))
671 warn_missing_format_attribute
= 1;
672 else if (!strcmp (p
, "-Wno-missing-format-attribute"))
673 warn_missing_format_attribute
= 0;
674 else if (!strcmp (p
, "-Wpointer-arith"))
675 warn_pointer_arith
= 1;
676 else if (!strcmp (p
, "-Wno-pointer-arith"))
677 warn_pointer_arith
= 0;
678 else if (!strcmp (p
, "-Wstrict-prototypes"))
679 warn_strict_prototypes
= 1;
680 else if (!strcmp (p
, "-Wno-strict-prototypes"))
681 warn_strict_prototypes
= 0;
682 else if (!strcmp (p
, "-Wmissing-prototypes"))
683 warn_missing_prototypes
= 1;
684 else if (!strcmp (p
, "-Wno-missing-prototypes"))
685 warn_missing_prototypes
= 0;
686 else if (!strcmp (p
, "-Wmissing-declarations"))
687 warn_missing_declarations
= 1;
688 else if (!strcmp (p
, "-Wno-missing-declarations"))
689 warn_missing_declarations
= 0;
690 else if (!strcmp (p
, "-Wredundant-decls"))
691 warn_redundant_decls
= 1;
692 else if (!strcmp (p
, "-Wno-redundant-decls"))
693 warn_redundant_decls
= 0;
694 else if (!strcmp (p
, "-Wnested-externs"))
695 warn_nested_externs
= 1;
696 else if (!strcmp (p
, "-Wno-nested-externs"))
697 warn_nested_externs
= 0;
698 else if (!strcmp (p
, "-Wtraditional"))
699 warn_traditional
= 1;
700 else if (!strcmp (p
, "-Wno-traditional"))
701 warn_traditional
= 0;
702 else if (!strncmp (p
, "-Wformat=", 9))
703 set_Wformat (atoi (p
+ 9));
704 else if (!strcmp (p
, "-Wformat"))
706 else if (!strcmp (p
, "-Wno-format"))
708 else if (!strcmp (p
, "-Wformat-y2k"))
710 else if (!strcmp (p
, "-Wno-format-y2k"))
712 else if (!strcmp (p
, "-Wformat-extra-args"))
713 warn_format_extra_args
= 1;
714 else if (!strcmp (p
, "-Wno-format-extra-args"))
715 warn_format_extra_args
= 0;
716 else if (!strcmp (p
, "-Wformat-nonliteral"))
717 warn_format_nonliteral
= 1;
718 else if (!strcmp (p
, "-Wno-format-nonliteral"))
719 warn_format_nonliteral
= 0;
720 else if (!strcmp (p
, "-Wformat-security"))
721 warn_format_security
= 1;
722 else if (!strcmp (p
, "-Wno-format-security"))
723 warn_format_security
= 0;
724 else if (!strcmp (p
, "-Wchar-subscripts"))
725 warn_char_subscripts
= 1;
726 else if (!strcmp (p
, "-Wno-char-subscripts"))
727 warn_char_subscripts
= 0;
728 else if (!strcmp (p
, "-Wconversion"))
730 else if (!strcmp (p
, "-Wno-conversion"))
732 else if (!strcmp (p
, "-Wparentheses"))
733 warn_parentheses
= 1;
734 else if (!strcmp (p
, "-Wno-parentheses"))
735 warn_parentheses
= 0;
736 else if (!strcmp (p
, "-Wreturn-type"))
737 warn_return_type
= 1;
738 else if (!strcmp (p
, "-Wno-return-type"))
739 warn_return_type
= 0;
740 else if (!strcmp (p
, "-Wsequence-point"))
741 warn_sequence_point
= 1;
742 else if (!strcmp (p
, "-Wno-sequence-point"))
743 warn_sequence_point
= 0;
744 else if (!strcmp (p
, "-Wcomment"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p
, "-Wno-comment"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p
, "-Wcomments"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p
, "-Wno-comments"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p
, "-Wtrigraphs"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p
, "-Wno-trigraphs"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p
, "-Wundef"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p
, "-Wno-undef"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p
, "-Wimport"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p
, "-Wno-import"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p
, "-Wmissing-braces"))
765 warn_missing_braces
= 1;
766 else if (!strcmp (p
, "-Wno-missing-braces"))
767 warn_missing_braces
= 0;
768 else if (!strcmp (p
, "-Wmain"))
770 else if (!strcmp (p
, "-Wno-main"))
772 else if (!strcmp (p
, "-Wsign-compare"))
773 warn_sign_compare
= 1;
774 else if (!strcmp (p
, "-Wno-sign-compare"))
775 warn_sign_compare
= 0;
776 else if (!strcmp (p
, "-Wfloat-equal"))
777 warn_float_equal
= 1;
778 else if (!strcmp (p
, "-Wno-float-equal"))
779 warn_float_equal
= 0;
780 else if (!strcmp (p
, "-Wmultichar"))
782 else if (!strcmp (p
, "-Wno-multichar"))
784 else if (!strcmp (p
, "-Wunknown-pragmas"))
785 /* Set to greater than 1, so that even unknown pragmas in system
786 headers will be warned about. */
787 warn_unknown_pragmas
= 2;
788 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
789 warn_unknown_pragmas
= 0;
790 else if (!strcmp (p
, "-Wall"))
792 /* We save the value of warn_uninitialized, since if they put
793 -Wuninitialized on the command line, we need to generate a
794 warning about not using it without also specifying -O. */
795 if (warn_uninitialized
!= 1)
796 warn_uninitialized
= 2;
797 warn_implicit_int
= 1;
798 mesg_implicit_function_declaration
= 1;
799 warn_return_type
= 1;
803 warn_char_subscripts
= 1;
804 warn_parentheses
= 1;
805 warn_sequence_point
= 1;
806 warn_missing_braces
= 1;
807 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
808 it off only if it's not explicit. */
810 /* Only warn about unknown pragmas that are not in system headers. */
811 warn_unknown_pragmas
= 1;
814 return strings_processed
;
819 /* Hooks for print_node. */
822 print_lang_decl (file
, node
, indent
)
823 FILE *file ATTRIBUTE_UNUSED
;
824 tree node ATTRIBUTE_UNUSED
;
825 int indent ATTRIBUTE_UNUSED
;
830 print_lang_type (file
, node
, indent
)
831 FILE *file ATTRIBUTE_UNUSED
;
832 tree node ATTRIBUTE_UNUSED
;
833 int indent ATTRIBUTE_UNUSED
;
838 print_lang_identifier (file
, node
, indent
)
843 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
844 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
845 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
846 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
847 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
848 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
849 if (C_IS_RESERVED_WORD (node
))
851 tree rid
= ridpointers
[C_RID_CODE (node
)];
852 indent_to (file
, indent
+ 4);
853 fprintf (file
, "rid ");
854 fprintf (file
, HOST_PTR_PRINTF
, (void *)rid
);
855 fprintf (file
, " \"%s\"", IDENTIFIER_POINTER (rid
));
859 /* Hook called at end of compilation to assume 1 elt
860 for a top-level tentative array defn that wasn't complete before. */
863 finish_incomplete_decl (decl
)
866 if (TREE_CODE (decl
) == VAR_DECL
)
868 tree type
= TREE_TYPE (decl
);
869 if (type
!= error_mark_node
870 && TREE_CODE (type
) == ARRAY_TYPE
871 && ! DECL_EXTERNAL (decl
)
872 && TYPE_DOMAIN (type
) == 0)
874 warning_with_decl (decl
, "array `%s' assumed to have one element");
876 complete_array_type (type
, NULL_TREE
, 1);
878 layout_decl (decl
, 0);
883 /* Create a new `struct binding_level'. */
885 static struct binding_level
*
886 make_binding_level ()
889 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
892 /* Nonzero if we are currently in the global binding level. */
897 return current_binding_level
== global_binding_level
;
903 keep_next_level_flag
= 1;
906 /* Nonzero if the current level needs to have a BLOCK made. */
911 return ((current_binding_level
->keep_if_subblocks
912 && current_binding_level
->blocks
!= 0)
913 || current_binding_level
->keep
914 || current_binding_level
->names
!= 0
915 || (current_binding_level
->tags
!= 0
916 && !current_binding_level
->tag_transparent
));
919 /* Identify this binding level as a level of parameters.
920 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
921 But it turns out there is no way to pass the right value for
922 DEFINITION_FLAG, so we ignore it. */
925 declare_parm_level (definition_flag
)
926 int definition_flag ATTRIBUTE_UNUSED
;
928 current_binding_level
->parm_flag
= 1;
931 /* Nonzero if currently making parm declarations. */
936 return current_binding_level
->parm_flag
;
939 /* Enter a new binding level.
940 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
941 not for that of tags. */
944 pushlevel (tag_transparent
)
947 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
949 /* If this is the top level of a function,
950 just make sure that NAMED_LABELS is 0. */
952 if (current_binding_level
== global_binding_level
)
957 /* Reuse or create a struct for this binding level. */
959 if (free_binding_level
)
961 newlevel
= free_binding_level
;
962 free_binding_level
= free_binding_level
->level_chain
;
966 newlevel
= make_binding_level ();
969 /* Add this level to the front of the chain (stack) of levels that
972 *newlevel
= clear_binding_level
;
973 newlevel
->tag_transparent
975 || (current_binding_level
976 ? current_binding_level
->subblocks_tag_transparent
978 newlevel
->level_chain
= current_binding_level
;
979 current_binding_level
= newlevel
;
980 newlevel
->keep
= keep_next_level_flag
;
981 keep_next_level_flag
= 0;
982 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
983 keep_next_if_subblocks
= 0;
986 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
989 clear_limbo_values (block
)
994 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
995 if (DECL_NAME (tem
) != 0)
996 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
998 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
999 clear_limbo_values (tem
);
1002 /* Exit a binding level.
1003 Pop the level off, and restore the state of the identifier-decl mappings
1004 that were in effect when this level was entered.
1006 If KEEP is nonzero, this level had explicit declarations, so
1007 and create a "block" (a BLOCK node) for the level
1008 to record its declarations and subblocks for symbol table output.
1010 If FUNCTIONBODY is nonzero, this level is the body of a function,
1011 so create a block as if KEEP were set and also clear out all
1014 If REVERSE is nonzero, reverse the order of decls before putting
1015 them into the BLOCK. */
1018 poplevel (keep
, reverse
, functionbody
)
1024 /* The chain of decls was accumulated in reverse order.
1025 Put it into forward order, just for cleanliness. */
1027 tree tags
= current_binding_level
->tags
;
1028 tree subblocks
= current_binding_level
->blocks
;
1031 int block_previously_created
;
1033 keep
|= current_binding_level
->keep
;
1035 /* This warning is turned off because it causes warnings for
1036 declarations like `extern struct foo *x'. */
1038 /* Warn about incomplete structure types in this level. */
1039 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1040 if (!COMPLETE_TYPE_P (TREE_VALUE (link
)))
1042 tree type
= TREE_VALUE (link
);
1043 tree type_name
= TYPE_NAME (type
);
1044 char *id
= IDENTIFIER_POINTER (TREE_CODE (type_name
) == IDENTIFIER_NODE
1046 : DECL_NAME (type_name
));
1047 switch (TREE_CODE (type
))
1050 error ("`struct %s' incomplete in scope ending here", id
);
1053 error ("`union %s' incomplete in scope ending here", id
);
1056 error ("`enum %s' incomplete in scope ending here", id
);
1062 /* Get the decls in the order they were written.
1063 Usually current_binding_level->names is in reverse order.
1064 But parameter decls were previously put in forward order. */
1067 current_binding_level
->names
1068 = decls
= nreverse (current_binding_level
->names
);
1070 decls
= current_binding_level
->names
;
1072 /* Output any nested inline functions within this block
1073 if they weren't already output. */
1075 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1076 if (TREE_CODE (decl
) == FUNCTION_DECL
1077 && ! TREE_ASM_WRITTEN (decl
)
1078 && DECL_INITIAL (decl
) != 0
1079 && TREE_ADDRESSABLE (decl
))
1081 /* If this decl was copied from a file-scope decl
1082 on account of a block-scope extern decl,
1083 propagate TREE_ADDRESSABLE to the file-scope decl.
1085 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1086 true, since then the decl goes through save_for_inline_copying. */
1087 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1088 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1089 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1092 /* We used to warn about unused variables in expand_end_bindings,
1093 i.e. while generating RTL. But in function-at-a-time mode we may
1094 choose to never expand a function at all (e.g. auto inlining), so
1095 we do this explicitly now. */
1096 warn_about_unused_variables (getdecls ());
1098 /* If there were any declarations or structure tags in that level,
1099 or if this level is a function body,
1100 create a BLOCK to record them for the life of this function. */
1103 block_previously_created
= (current_binding_level
->this_block
!= 0);
1104 if (block_previously_created
)
1105 block
= current_binding_level
->this_block
;
1106 else if (keep
|| functionbody
1107 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1108 block
= make_node (BLOCK
);
1111 BLOCK_VARS (block
) = decls
;
1112 BLOCK_SUBBLOCKS (block
) = subblocks
;
1115 /* In each subblock, record that this is its superior. */
1117 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1118 BLOCK_SUPERCONTEXT (link
) = block
;
1120 /* Clear out the meanings of the local variables of this level. */
1122 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1124 if (DECL_NAME (link
) != 0)
1126 /* If the ident. was used or addressed via a local extern decl,
1127 don't forget that fact. */
1128 if (DECL_EXTERNAL (link
))
1130 if (TREE_USED (link
))
1131 TREE_USED (DECL_NAME (link
)) = 1;
1132 if (TREE_ADDRESSABLE (link
))
1133 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1135 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1139 /* Restore all name-meanings of the outer levels
1140 that were shadowed by this level. */
1142 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1143 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1145 /* If the level being exited is the top level of a function,
1146 check over all the labels, and clear out the current
1147 (function local) meanings of their names. */
1151 clear_limbo_values (block
);
1153 /* If this is the top level block of a function,
1154 the vars are the function's parameters.
1155 Don't leave them in the BLOCK because they are
1156 found in the FUNCTION_DECL instead. */
1158 BLOCK_VARS (block
) = 0;
1160 /* Clear out the definitions of all label names,
1161 since their scopes end here,
1162 and add them to BLOCK_VARS. */
1164 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1166 register tree label
= TREE_VALUE (link
);
1168 if (DECL_INITIAL (label
) == 0)
1170 error_with_decl (label
, "label `%s' used but not defined");
1171 /* Avoid crashing later. */
1172 define_label (input_filename
, lineno
,
1175 else if (warn_unused_label
&& !TREE_USED (label
))
1176 warning_with_decl (label
, "label `%s' defined but not used");
1177 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1179 /* Put the labels into the "variables" of the
1180 top-level block, so debugger can see them. */
1181 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1182 BLOCK_VARS (block
) = label
;
1186 /* Pop the current level, and free the structure for reuse. */
1189 register struct binding_level
*level
= current_binding_level
;
1190 current_binding_level
= current_binding_level
->level_chain
;
1192 level
->level_chain
= free_binding_level
;
1193 free_binding_level
= level
;
1196 /* Dispose of the block that we just made inside some higher level. */
1198 DECL_INITIAL (current_function_decl
) = block
;
1201 if (!block_previously_created
)
1202 current_binding_level
->blocks
1203 = chainon (current_binding_level
->blocks
, block
);
1205 /* If we did not make a block for the level just exited,
1206 any blocks made for inner levels
1207 (since they cannot be recorded as subblocks in that level)
1208 must be carried forward so they will later become subblocks
1209 of something else. */
1211 current_binding_level
->blocks
1212 = chainon (current_binding_level
->blocks
, subblocks
);
1214 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1215 binding contour so that they point to the appropriate construct, i.e.
1216 either to the current FUNCTION_DECL node, or else to the BLOCK node
1217 we just constructed.
1219 Note that for tagged types whose scope is just the formal parameter
1220 list for some function type specification, we can't properly set
1221 their TYPE_CONTEXTs here, because we don't have a pointer to the
1222 appropriate FUNCTION_TYPE node readily available to us. For those
1223 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1224 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1225 node which will represent the "scope" for these "parameter list local"
1229 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1230 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1232 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1233 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1236 TREE_USED (block
) = 1;
1241 /* Delete the node BLOCK from the current binding level.
1242 This is used for the block inside a stmt expr ({...})
1243 so that the block can be reinserted where appropriate. */
1246 delete_block (block
)
1250 if (current_binding_level
->blocks
== block
)
1251 current_binding_level
->blocks
= TREE_CHAIN (block
);
1252 for (t
= current_binding_level
->blocks
; t
;)
1254 if (TREE_CHAIN (t
) == block
)
1255 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1259 TREE_CHAIN (block
) = NULL
;
1260 /* Clear TREE_USED which is always set by poplevel.
1261 The flag is set again if insert_block is called. */
1262 TREE_USED (block
) = 0;
1265 /* Insert BLOCK at the end of the list of subblocks of the
1266 current binding level. This is used when a BIND_EXPR is expanded,
1267 to handle the BLOCK node inside the BIND_EXPR. */
1270 insert_block (block
)
1273 TREE_USED (block
) = 1;
1274 current_binding_level
->blocks
1275 = chainon (current_binding_level
->blocks
, block
);
1278 /* Set the BLOCK node for the innermost scope
1279 (the one we are currently in). */
1283 register tree block
;
1285 current_binding_level
->this_block
= block
;
1291 register struct binding_level
*newlevel
;
1293 /* Reuse or create a struct for this binding level. */
1295 if (free_binding_level
)
1297 newlevel
= free_binding_level
;
1298 free_binding_level
= free_binding_level
->level_chain
;
1302 newlevel
= make_binding_level ();
1305 /* Add this level to the front of the chain (stack) of label levels. */
1307 newlevel
->level_chain
= label_level_chain
;
1308 label_level_chain
= newlevel
;
1310 newlevel
->names
= named_labels
;
1311 newlevel
->shadowed
= shadowed_labels
;
1313 shadowed_labels
= 0;
1319 register struct binding_level
*level
= label_level_chain
;
1322 /* Clear out the definitions of the declared labels in this level.
1323 Leave in the list any ordinary, non-declared labels. */
1324 for (link
= named_labels
, prev
= 0; link
;)
1326 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1328 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1330 error_with_decl (TREE_VALUE (link
),
1331 "label `%s' used but not defined");
1332 /* Avoid crashing later. */
1333 define_label (input_filename
, lineno
,
1334 DECL_NAME (TREE_VALUE (link
)));
1336 else if (warn_unused_label
&& !TREE_USED (TREE_VALUE (link
)))
1337 warning_with_decl (TREE_VALUE (link
),
1338 "label `%s' defined but not used");
1339 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1341 /* Delete this element from the list. */
1342 link
= TREE_CHAIN (link
);
1344 TREE_CHAIN (prev
) = link
;
1346 named_labels
= link
;
1351 link
= TREE_CHAIN (link
);
1355 /* Bring back all the labels that were shadowed. */
1356 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1357 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1358 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1359 = TREE_VALUE (link
);
1361 named_labels
= chainon (named_labels
, level
->names
);
1362 shadowed_labels
= level
->shadowed
;
1364 /* Pop the current level, and free the structure for reuse. */
1365 label_level_chain
= label_level_chain
->level_chain
;
1366 level
->level_chain
= free_binding_level
;
1367 free_binding_level
= level
;
1370 /* Push a definition or a declaration of struct, union or enum tag "name".
1371 "type" should be the type node.
1372 We assume that the tag "name" is not already defined.
1374 Note that the definition may really be just a forward reference.
1375 In that case, the TYPE_SIZE will be zero. */
1378 pushtag (name
, type
)
1381 register struct binding_level
*b
;
1383 /* Find the proper binding level for this type tag. */
1385 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1390 /* Record the identifier as the type's name if it has none. */
1392 if (TYPE_NAME (type
) == 0)
1393 TYPE_NAME (type
) = name
;
1396 b
->tags
= tree_cons (name
, type
, b
->tags
);
1398 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1399 tagged type we just added to the current binding level. This fake
1400 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1401 to output a representation of a tagged type, and it also gives
1402 us a convenient place to record the "scope start" address for the
1405 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1407 /* An approximation for now, so we can tell this is a function-scope tag.
1408 This will be updated in poplevel. */
1409 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1412 /* Handle when a new declaration NEWDECL
1413 has the same name as an old one OLDDECL
1414 in the same binding contour.
1415 Prints an error message if appropriate.
1417 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1418 Otherwise, return 0.
1420 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1421 and OLDDECL is in an outer binding level and should thus not be changed. */
1424 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1425 register tree newdecl
, olddecl
;
1426 int different_binding_level
;
1428 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1429 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1430 && DECL_INITIAL (newdecl
) != 0);
1431 tree oldtype
= TREE_TYPE (olddecl
);
1432 tree newtype
= TREE_TYPE (newdecl
);
1435 if (DECL_P (olddecl
))
1436 DECL_MACHINE_ATTRIBUTES (newdecl
)
1437 = merge_machine_decl_attributes (olddecl
, newdecl
);
1439 if (TREE_CODE (newtype
) == ERROR_MARK
1440 || TREE_CODE (oldtype
) == ERROR_MARK
)
1443 /* New decl is completely inconsistent with the old one =>
1444 tell caller to replace the old one.
1445 This is always an error except in the case of shadowing a builtin. */
1446 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1448 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1449 && (DECL_BUILT_IN (olddecl
)
1450 || DECL_BUILT_IN_NONANSI (olddecl
)))
1452 /* If you declare a built-in or predefined function name as static,
1453 the old definition is overridden,
1454 but optionally warn this was a bad choice of name. */
1455 if (!TREE_PUBLIC (newdecl
))
1459 else if (DECL_BUILT_IN (olddecl
))
1460 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1462 warning_with_decl (newdecl
, "shadowing library function `%s'");
1464 /* Likewise, if the built-in is not ansi, then programs can
1465 override it even globally without an error. */
1466 else if (! DECL_BUILT_IN (olddecl
))
1467 warning_with_decl (newdecl
,
1468 "library function `%s' declared as non-function");
1470 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1471 warning_with_decl (newdecl
,
1472 "built-in function `%s' declared as non-function");
1474 warning_with_decl (newdecl
,
1475 "built-in function `%s' declared as non-function");
1479 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1480 error_with_decl (olddecl
, "previous declaration of `%s'");
1486 /* For real parm decl following a forward decl,
1487 return 1 so old decl will be reused. */
1488 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1489 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1492 /* The new declaration is the same kind of object as the old one.
1493 The declarations may partially match. Print warnings if they don't
1494 match enough. Ultimately, copy most of the information from the new
1495 decl to the old one, and keep using the old one. */
1497 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1498 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1499 && DECL_INITIAL (olddecl
) == 0)
1500 /* If -traditional, avoid error for redeclaring fcn
1501 after implicit decl. */
1503 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1504 && DECL_BUILT_IN (olddecl
))
1506 /* A function declaration for a built-in function. */
1507 if (!TREE_PUBLIC (newdecl
))
1509 /* If you declare a built-in function name as static, the
1510 built-in definition is overridden,
1511 but optionally warn this was a bad choice of name. */
1513 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1514 /* Discard the old built-in function. */
1517 else if (!types_match
)
1519 /* Accept the return type of the new declaration if same modes. */
1520 tree oldreturntype
= TREE_TYPE (oldtype
);
1521 tree newreturntype
= TREE_TYPE (newtype
);
1523 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1525 /* Function types may be shared, so we can't just modify
1526 the return type of olddecl's function type. */
1528 = build_function_type (newreturntype
,
1529 TYPE_ARG_TYPES (oldtype
));
1531 types_match
= comptypes (newtype
, trytype
);
1535 /* Accept harmless mismatch in first argument type also.
1537 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1538 && TYPE_ARG_TYPES (oldtype
) != 0
1539 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1540 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1541 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1542 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1544 /* Function types may be shared, so we can't just modify
1545 the return type of olddecl's function type. */
1547 = build_function_type (TREE_TYPE (oldtype
),
1548 tree_cons (NULL_TREE
,
1549 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1550 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1552 types_match
= comptypes (newtype
, trytype
);
1556 if (! different_binding_level
)
1557 TREE_TYPE (olddecl
) = oldtype
;
1561 /* If types don't match for a built-in, throw away the built-in. */
1562 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1566 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1567 && DECL_SOURCE_LINE (olddecl
) == 0)
1569 /* A function declaration for a predeclared function
1570 that isn't actually built in. */
1571 if (!TREE_PUBLIC (newdecl
))
1573 /* If you declare it as static, the
1574 default definition is overridden. */
1577 else if (!types_match
)
1579 /* If the types don't match, preserve volatility indication.
1580 Later on, we will discard everything else about the
1581 default declaration. */
1582 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1585 /* Permit char *foo () to match void *foo (...) if not pedantic,
1586 if one of them came from a system header file. */
1587 else if (!types_match
1588 && TREE_CODE (olddecl
) == FUNCTION_DECL
1589 && TREE_CODE (newdecl
) == FUNCTION_DECL
1590 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1591 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1592 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1593 || DECL_IN_SYSTEM_HEADER (newdecl
))
1594 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1595 && TYPE_ARG_TYPES (oldtype
) == 0
1596 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1597 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1599 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1600 && TYPE_ARG_TYPES (newtype
) == 0
1601 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1602 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1605 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1606 /* Make sure we keep void * as ret type, not char *. */
1607 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1608 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1610 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1611 we will come back here again. */
1612 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1614 else if (!types_match
1615 /* Permit char *foo (int, ...); followed by char *foo ();
1617 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1619 /* Return types must still match. */
1620 && comptypes (TREE_TYPE (oldtype
),
1621 TREE_TYPE (newtype
))
1622 && TYPE_ARG_TYPES (newtype
) == 0))
1624 error_with_decl (newdecl
, "conflicting types for `%s'");
1625 /* Check for function type mismatch
1626 involving an empty arglist vs a nonempty one. */
1627 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1628 && comptypes (TREE_TYPE (oldtype
),
1629 TREE_TYPE (newtype
))
1630 && ((TYPE_ARG_TYPES (oldtype
) == 0
1631 && DECL_INITIAL (olddecl
) == 0)
1633 (TYPE_ARG_TYPES (newtype
) == 0
1634 && DECL_INITIAL (newdecl
) == 0)))
1636 /* Classify the problem further. */
1637 register tree t
= TYPE_ARG_TYPES (oldtype
);
1639 t
= TYPE_ARG_TYPES (newtype
);
1640 for (; t
; t
= TREE_CHAIN (t
))
1642 register tree type
= TREE_VALUE (t
);
1644 if (TREE_CHAIN (t
) == 0
1645 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1647 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1651 if (simple_type_promotes_to (type
) != NULL_TREE
)
1653 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1658 error_with_decl (olddecl
, "previous declaration of `%s'");
1662 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1668 error_with_decl (newdecl
, "redefinition of `%s'");
1671 error_with_decl (newdecl
, "redeclaration of `%s'");
1674 error_with_decl (newdecl
, "conflicting declarations of `%s'");
1680 error_with_decl (olddecl
,
1681 ((DECL_INITIAL (olddecl
)
1682 && current_binding_level
== global_binding_level
)
1683 ? "`%s' previously defined here"
1684 : "`%s' previously declared here"));
1686 else if (TREE_CODE (newdecl
) == TYPE_DECL
1687 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1688 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1690 warning_with_decl (newdecl
, "redefinition of `%s'");
1693 ((DECL_INITIAL (olddecl
)
1694 && current_binding_level
== global_binding_level
)
1695 ? "`%s' previously defined here"
1696 : "`%s' previously declared here"));
1698 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1699 && DECL_INITIAL (olddecl
) != 0
1700 && TYPE_ARG_TYPES (oldtype
) == 0
1701 && TYPE_ARG_TYPES (newtype
) != 0
1702 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1704 register tree type
, parm
;
1706 /* Prototype decl follows defn w/o prototype. */
1708 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1709 type
= TYPE_ARG_TYPES (newtype
),
1712 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1714 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1715 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1717 warning_with_decl (newdecl
, "prototype for `%s' follows");
1718 warning_with_decl (olddecl
, "non-prototype definition here");
1721 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1722 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1724 error_with_decl (newdecl
,
1725 "prototype for `%s' follows and number of arguments doesn't match");
1726 error_with_decl (olddecl
, "non-prototype definition here");
1730 /* Type for passing arg must be consistent
1731 with that declared for the arg. */
1732 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1733 /* If -traditional, allow `unsigned int' instead of `int'
1734 in the prototype. */
1735 && (! (flag_traditional
1736 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1737 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1739 error_with_decl (newdecl
,
1740 "prototype for `%s' follows and argument %d doesn't match",
1742 error_with_decl (olddecl
, "non-prototype definition here");
1748 /* Warn about mismatches in various flags. */
1751 /* Warn if function is now inline
1752 but was previously declared not inline and has been called. */
1753 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1754 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1755 && TREE_USED (olddecl
))
1756 warning_with_decl (newdecl
,
1757 "`%s' declared inline after being called");
1758 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1759 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1760 && DECL_INITIAL (olddecl
) != 0)
1761 warning_with_decl (newdecl
,
1762 "`%s' declared inline after its definition");
1764 /* If pedantic, warn when static declaration follows a non-static
1765 declaration. Otherwise, do so only for functions. */
1766 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1767 && TREE_PUBLIC (olddecl
)
1768 && !TREE_PUBLIC (newdecl
))
1769 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1771 /* If warn_traditional, warn when a non-static function
1772 declaration follows a static one. */
1773 if (warn_traditional
&& !in_system_header
1774 && TREE_CODE (olddecl
) == FUNCTION_DECL
1775 && !TREE_PUBLIC (olddecl
)
1776 && TREE_PUBLIC (newdecl
))
1777 warning_with_decl (newdecl
, "non-static declaration for `%s' follows static");
1779 /* Warn when const declaration follows a non-const
1780 declaration, but not for functions. */
1781 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1782 && !TREE_READONLY (olddecl
)
1783 && TREE_READONLY (newdecl
))
1784 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1785 /* These bits are logically part of the type, for variables.
1786 But not for functions
1787 (where qualifiers are not valid ANSI anyway). */
1788 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1789 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1790 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1791 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1795 /* Optionally warn about more than one declaration for the same name. */
1796 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1797 /* Don't warn about a function declaration
1798 followed by a definition. */
1799 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1800 && DECL_INITIAL (olddecl
) == 0)
1801 /* Don't warn about extern decl followed by (tentative) definition. */
1802 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1804 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1805 warning_with_decl (olddecl
, "previous declaration of `%s'");
1808 /* Copy all the DECL_... slots specified in the new decl
1809 except for any that we copy here from the old type.
1811 Past this point, we don't change OLDTYPE and NEWTYPE
1812 even if we change the types of NEWDECL and OLDDECL. */
1816 /* When copying info to olddecl, we store into write_olddecl
1817 instead. This allows us to avoid modifying olddecl when
1818 different_binding_level is true. */
1819 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1821 /* Merge the data types specified in the two decls. */
1822 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1824 if (different_binding_level
)
1826 = build_type_attribute_variant
1828 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1829 TYPE_ATTRIBUTES (oldtype
)));
1832 = TREE_TYPE (olddecl
)
1833 = common_type (newtype
, oldtype
);
1836 /* Lay the type out, unless already done. */
1837 if (oldtype
!= TREE_TYPE (newdecl
))
1839 if (TREE_TYPE (newdecl
) != error_mark_node
)
1840 layout_type (TREE_TYPE (newdecl
));
1841 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1842 && TREE_CODE (newdecl
) != TYPE_DECL
1843 && TREE_CODE (newdecl
) != CONST_DECL
)
1844 layout_decl (newdecl
, 0);
1848 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1849 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1850 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1851 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1852 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1853 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1855 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1856 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1860 /* Keep the old rtl since we can safely use it. */
1861 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1863 /* Merge the type qualifiers. */
1864 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1865 && DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1866 && ! TREE_THIS_VOLATILE (newdecl
))
1867 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1869 if (TREE_READONLY (newdecl
))
1870 TREE_READONLY (write_olddecl
) = 1;
1872 if (TREE_THIS_VOLATILE (newdecl
))
1874 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1875 if (TREE_CODE (newdecl
) == VAR_DECL
1876 /* If an automatic variable is re-declared in the same
1877 function scope, but the old declaration was not
1878 volatile, make_var_volatile() would crash because the
1879 variable would have been assigned to a pseudo, not a
1880 MEM. Since this duplicate declaration is invalid
1881 anyway, we just skip the call. */
1883 make_var_volatile (newdecl
);
1886 /* Keep source location of definition rather than declaration. */
1887 /* When called with different_binding_level set, keep the old
1888 information so that meaningful diagnostics can be given. */
1889 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1890 && ! different_binding_level
)
1892 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1893 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1896 /* Merge the unused-warning information. */
1897 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1898 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1899 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1900 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1902 /* Merge the initialization information. */
1903 /* When called with different_binding_level set, don't copy over
1904 DECL_INITIAL, so that we don't accidentally change function
1905 declarations into function definitions. */
1906 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1907 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1909 /* Merge the section attribute.
1910 We want to issue an error if the sections conflict but that must be
1911 done later in decl_attributes since we are called before attributes
1913 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1914 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1916 /* Copy the assembler name.
1917 Currently, it can only be defined in the prototype. */
1918 DECL_ASSEMBLER_NAME (newdecl
) = DECL_ASSEMBLER_NAME (olddecl
);
1920 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1922 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1923 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1925 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1926 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1927 DECL_NO_CHECK_MEMORY_USAGE (newdecl
)
1928 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl
);
1929 DECL_NO_LIMIT_STACK (newdecl
)
1930 |= DECL_NO_LIMIT_STACK (olddecl
);
1933 /* If cannot merge, then use the new type and qualifiers,
1934 and don't preserve the old rtl. */
1935 else if (! different_binding_level
)
1937 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1938 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1939 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1940 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1943 /* Merge the storage class information. */
1944 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1945 /* For functions, static overrides non-static. */
1946 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1948 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1949 /* This is since we don't automatically
1950 copy the attributes of NEWDECL into OLDDECL. */
1951 /* No need to worry about different_binding_level here because
1952 then TREE_PUBLIC (newdecl) was true. */
1953 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1954 /* If this clears `static', clear it in the identifier too. */
1955 if (! TREE_PUBLIC (olddecl
))
1956 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1958 if (DECL_EXTERNAL (newdecl
))
1960 if (! different_binding_level
)
1962 /* Don't mess with these flags on local externs; they remain
1963 external even if there's a declaration at file scope which
1965 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1966 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1968 /* An extern decl does not override previous storage class. */
1969 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1970 if (! DECL_EXTERNAL (newdecl
))
1971 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1975 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1976 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1979 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1981 /* If either decl says `inline', this fn is inline,
1982 unless its definition was passed already. */
1983 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1984 DECL_INLINE (olddecl
) = 1;
1986 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1988 if (DECL_BUILT_IN (olddecl
))
1990 /* Get rid of any built-in function if new arg types don't match it
1991 or if we have a function definition. */
1992 if (! types_match
|| new_is_definition
)
1994 if (! different_binding_level
)
1996 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1997 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
2002 /* If redeclaring a builtin function, and not a definition,
2003 it stays built in. */
2004 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2005 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2008 /* Also preserve various other info from the definition. */
2009 else if (! new_is_definition
)
2010 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
2011 if (! new_is_definition
)
2013 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2014 /* When called with different_binding_level set, don't copy over
2015 DECL_INITIAL, so that we don't accidentally change function
2016 declarations into function definitions. */
2017 if (! different_binding_level
)
2018 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2019 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
2020 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2021 if (DECL_INLINE (newdecl
))
2022 DECL_ABSTRACT_ORIGIN (newdecl
) = DECL_ABSTRACT_ORIGIN (olddecl
);
2025 if (different_binding_level
)
2028 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2029 But preserve OLDDECL's DECL_UID. */
2031 register unsigned olddecl_uid
= DECL_UID (olddecl
);
2033 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2034 (char *) newdecl
+ sizeof (struct tree_common
),
2035 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
2036 DECL_UID (olddecl
) = olddecl_uid
;
2039 /* NEWDECL contains the merged attribute lists.
2040 Update OLDDECL to be the same. */
2041 DECL_MACHINE_ATTRIBUTES (olddecl
) = DECL_MACHINE_ATTRIBUTES (newdecl
);
2046 /* Record a decl-node X as belonging to the current lexical scope.
2047 Check for errors (such as an incompatible declaration for the same
2048 name already seen in the same scope).
2050 Returns either X or an old decl for the same name.
2051 If an old decl is returned, it may have been smashed
2052 to agree with what X says. */
2059 register tree name
= DECL_NAME (x
);
2060 register struct binding_level
*b
= current_binding_level
;
2062 DECL_CONTEXT (x
) = current_function_decl
;
2063 /* A local extern declaration for a function doesn't constitute nesting.
2064 A local auto declaration does, since it's a forward decl
2065 for a nested function coming later. */
2066 if ((TREE_CODE (x
) == FUNCTION_DECL
|| TREE_CODE (x
) == VAR_DECL
)
2067 && DECL_INITIAL (x
) == 0 && DECL_EXTERNAL (x
))
2068 DECL_CONTEXT (x
) = 0;
2070 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
2071 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2072 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2073 && !DECL_IN_SYSTEM_HEADER (x
))
2074 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
2080 int different_binding_level
= 0;
2082 t
= lookup_name_current_level (name
);
2083 /* Don't type check externs here when -traditional. This is so that
2084 code with conflicting declarations inside blocks will get warnings
2085 not errors. X11 for instance depends on this. */
2086 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2088 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2089 /* Type decls at global scope don't conflict with externs declared
2090 inside lexical blocks. */
2091 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2093 different_binding_level
= 1;
2095 if (t
!= 0 && t
== error_mark_node
)
2096 /* error_mark_node is 0 for a while during initialization! */
2099 error_with_decl (x
, "`%s' used prior to declaration");
2104 file
= DECL_SOURCE_FILE (t
);
2105 line
= DECL_SOURCE_LINE (t
);
2108 /* If this decl is `static' and an implicit decl was seen previously,
2109 warn. But don't complain if -traditional,
2110 since traditional compilers don't complain. */
2111 if (! flag_traditional
&& TREE_PUBLIC (name
)
2112 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2113 sets this for all functions. */
2114 && ! TREE_PUBLIC (x
)
2115 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2116 /* We used to warn also for explicit extern followed by static,
2117 but sometimes you need to do it that way. */
2118 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2120 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2121 IDENTIFIER_POINTER (name
));
2122 pedwarn_with_file_and_line
2123 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2124 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2125 "previous declaration of `%s'",
2126 IDENTIFIER_POINTER (name
));
2127 TREE_THIS_VOLATILE (name
) = 1;
2130 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2132 if (TREE_CODE (t
) == PARM_DECL
)
2134 /* Don't allow more than one "real" duplicate
2135 of a forward parm decl. */
2136 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2142 /* If we are processing a typedef statement, generate a whole new
2143 ..._TYPE node (which will be just an variant of the existing
2144 ..._TYPE node with identical properties) and then install the
2145 TYPE_DECL node generated to represent the typedef name as the
2146 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2148 The whole point here is to end up with a situation where each
2149 and every ..._TYPE node the compiler creates will be uniquely
2150 associated with AT MOST one node representing a typedef name.
2151 This way, even though the compiler substitutes corresponding
2152 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2153 early on, later parts of the compiler can always do the reverse
2154 translation and get back the corresponding typedef name. For
2157 typedef struct S MY_TYPE;
2160 Later parts of the compiler might only know that `object' was of
2161 type `struct S' if it were not for code just below. With this
2162 code however, later parts of the compiler see something like:
2164 struct S' == struct S
2165 typedef struct S' MY_TYPE;
2168 And they can then deduce (from the node for type struct S') that
2169 the original object declaration was:
2173 Being able to do this is important for proper support of protoize,
2174 and also for generating precise symbolic debugging information
2175 which takes full account of the programmer's (typedef) vocabulary.
2177 Obviously, we don't want to generate a duplicate ..._TYPE node if
2178 the TYPE_DECL node that we are now processing really represents a
2179 standard built-in type.
2181 Since all standard types are effectively declared at line zero
2182 in the source file, we can easily check to see if we are working
2183 on a standard type by checking the current value of lineno. */
2185 if (TREE_CODE (x
) == TYPE_DECL
)
2187 if (DECL_SOURCE_LINE (x
) == 0)
2189 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2190 TYPE_NAME (TREE_TYPE (x
)) = x
;
2192 else if (TREE_TYPE (x
) != error_mark_node
2193 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2195 tree tt
= TREE_TYPE (x
);
2196 DECL_ORIGINAL_TYPE (x
) = tt
;
2197 tt
= build_type_copy (tt
);
2199 TREE_USED (tt
) = TREE_USED (x
);
2204 /* Multiple external decls of the same identifier ought to match.
2205 Check against both global declarations (when traditional) and out of
2206 scope (limbo) block level declarations.
2208 We get warnings about inline functions where they are defined.
2209 Avoid duplicate warnings where they are used. */
2211 && ! (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INLINE (x
)))
2215 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2216 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2217 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2218 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2219 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2220 /* Decls in limbo are always extern, so no need to check that. */
2221 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2225 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2226 /* If old decl is built-in, we already warned if we should. */
2227 && !DECL_BUILT_IN (decl
))
2229 pedwarn_with_decl (x
,
2230 "type mismatch with previous external decl");
2231 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2235 /* If a function has had an implicit declaration, and then is defined,
2236 make sure they are compatible. */
2238 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2239 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2240 && TREE_CODE (x
) == FUNCTION_DECL
2241 && ! comptypes (TREE_TYPE (x
),
2242 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2244 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2245 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2246 "previous implicit declaration of `%s'");
2249 /* In PCC-compatibility mode, extern decls of vars with no current decl
2250 take effect at top level no matter where they are. */
2251 if (flag_traditional
&& DECL_EXTERNAL (x
)
2252 && lookup_name (name
) == 0)
2254 tree type
= TREE_TYPE (x
);
2256 /* But don't do this if the type contains temporary nodes. */
2259 if (type
== error_mark_node
)
2261 if (TYPE_CONTEXT (type
))
2263 warning_with_decl (x
, "type of external `%s' is not global");
2264 /* By exiting the loop early, we leave TYPE nonzero,
2265 and thus prevent globalization of the decl. */
2268 else if (TREE_CODE (type
) == FUNCTION_TYPE
2269 && TYPE_ARG_TYPES (type
) != 0)
2270 /* The types might not be truly local,
2271 but the list of arg types certainly is temporary.
2272 Since prototypes are nontraditional,
2273 ok not to do the traditional thing. */
2275 type
= TREE_TYPE (type
);
2279 b
= global_binding_level
;
2282 /* This name is new in its binding level.
2283 Install the new declaration and return it. */
2284 if (b
== global_binding_level
)
2286 /* Install a global value. */
2288 /* If the first global decl has external linkage,
2289 warn if we later see static one. */
2290 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2291 TREE_PUBLIC (name
) = 1;
2293 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2295 /* We no longer care about any previous block level declarations. */
2296 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2298 /* Don't forget if the function was used via an implicit decl. */
2299 if (IDENTIFIER_IMPLICIT_DECL (name
)
2300 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2301 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2303 /* Don't forget if its address was taken in that way. */
2304 if (IDENTIFIER_IMPLICIT_DECL (name
)
2305 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2306 TREE_ADDRESSABLE (x
) = 1;
2308 /* Warn about mismatches against previous implicit decl. */
2309 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2310 /* If this real decl matches the implicit, don't complain. */
2311 && ! (TREE_CODE (x
) == FUNCTION_DECL
2312 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2313 == integer_type_node
)))
2314 pedwarn ("`%s' was previously implicitly declared to return `int'",
2315 IDENTIFIER_POINTER (name
));
2317 /* If this decl is `static' and an `extern' was seen previously,
2318 that is erroneous. */
2319 if (TREE_PUBLIC (name
)
2320 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2322 /* Okay to redeclare an ANSI built-in as static. */
2323 if (t
!= 0 && DECL_BUILT_IN (t
))
2325 /* Okay to declare a non-ANSI built-in as anything. */
2326 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2328 /* Okay to have global type decl after an earlier extern
2329 declaration inside a lexical block. */
2330 else if (TREE_CODE (x
) == TYPE_DECL
)
2332 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2334 if (! TREE_THIS_VOLATILE (name
))
2335 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2336 IDENTIFIER_POINTER (name
));
2339 pedwarn ("`%s' was declared `extern' and later `static'",
2340 IDENTIFIER_POINTER (name
));
2345 /* Here to install a non-global value. */
2346 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2347 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2349 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2351 /* If this is an extern function declaration, see if we
2352 have a global definition or declaration for the function. */
2355 && TREE_CODE (x
) == FUNCTION_DECL
2356 && TREE_CODE (oldglobal
) == FUNCTION_DECL
2357 && DECL_EXTERNAL (x
) && ! DECL_INLINE (x
))
2359 /* We have one. Their types must agree. */
2360 if (! comptypes (TREE_TYPE (x
),
2361 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2362 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2365 /* Inner extern decl is inline if global one is.
2366 Copy enough to really inline it. */
2367 if (DECL_INLINE (oldglobal
))
2369 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2370 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2371 ? 0 : DECL_INITIAL (oldglobal
));
2372 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2373 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2374 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2375 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2376 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2377 DECL_ABSTRACT_ORIGIN (x
)
2378 = DECL_ABSTRACT_ORIGIN (oldglobal
);
2380 /* Inner extern decl is built-in if global one is. */
2381 if (DECL_BUILT_IN (oldglobal
))
2383 DECL_BUILT_IN_CLASS (x
) = DECL_BUILT_IN_CLASS (oldglobal
);
2384 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2386 /* Keep the arg types from a file-scope fcn defn. */
2387 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2388 && DECL_INITIAL (oldglobal
)
2389 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2390 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2395 /* This case is probably sometimes the right thing to do. */
2396 /* If we have a local external declaration,
2397 then any file-scope declaration should not
2398 have been static. */
2399 if (oldlocal
== 0 && oldglobal
!= 0
2400 && !TREE_PUBLIC (oldglobal
)
2401 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2402 warning ("`%s' locally external but globally static",
2403 IDENTIFIER_POINTER (name
));
2406 /* If we have a local external declaration,
2407 and no file-scope declaration has yet been seen,
2408 then if we later have a file-scope decl it must not be static. */
2410 && DECL_EXTERNAL (x
)
2414 TREE_PUBLIC (name
) = 1;
2416 /* Save this decl, so that we can do type checking against
2417 other decls after it falls out of scope.
2419 Only save it once. This prevents temporary decls created in
2420 expand_inline_function from being used here, since this
2421 will have been set when the inline function was parsed.
2422 It also helps give slightly better warnings. */
2423 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2424 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2427 /* Warn if shadowing an argument at the top level of the body. */
2428 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2429 /* This warning doesn't apply to the parms of a nested fcn. */
2430 && ! current_binding_level
->parm_flag
2431 /* Check that this is one level down from the parms. */
2432 && current_binding_level
->level_chain
->parm_flag
2433 /* Check that the decl being shadowed
2434 comes from the parm level, one level up. */
2435 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2437 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2438 pedwarn ("declaration of `%s' shadows a parameter",
2439 IDENTIFIER_POINTER (name
));
2441 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2442 IDENTIFIER_POINTER (name
));
2445 /* Maybe warn if shadowing something else. */
2446 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2447 /* No shadow warnings for internally generated vars. */
2448 && DECL_SOURCE_LINE (x
) != 0
2449 /* No shadow warnings for vars made for inlining. */
2450 && ! DECL_FROM_INLINE (x
))
2452 const char *id
= IDENTIFIER_POINTER (name
);
2454 if (TREE_CODE (x
) == PARM_DECL
2455 && current_binding_level
->level_chain
->parm_flag
)
2456 /* Don't warn about the parm names in function declarator
2457 within a function declarator.
2458 It would be nice to avoid warning in any function
2459 declarator in a declaration, as opposed to a definition,
2460 but there is no way to tell it's not a definition. */
2462 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2463 warning ("declaration of `%s' shadows a parameter", id
);
2464 else if (oldlocal
!= 0)
2465 warning ("declaration of `%s' shadows previous local", id
);
2466 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2467 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2468 warning ("declaration of `%s' shadows global declaration", id
);
2471 /* If storing a local value, there may already be one (inherited).
2472 If so, record it for restoration when this binding level ends. */
2474 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2477 /* Keep count of variables in this level with incomplete type.
2478 If the input is erroneous, we can have error_mark in the type
2479 slot (e.g. "f(void a, ...)") - that doesn't count as an
2481 if (TREE_TYPE (x
) != error_mark_node
2482 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2486 /* Put decls on list in reverse order.
2487 We will reverse them later if necessary. */
2488 TREE_CHAIN (x
) = b
->names
;
2494 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2497 pushdecl_top_level (x
)
2501 register struct binding_level
*b
= current_binding_level
;
2503 current_binding_level
= global_binding_level
;
2505 current_binding_level
= b
;
2509 /* Generate an implicit declaration for identifier FUNCTIONID
2510 as a function of type int (). Print a warning if appropriate. */
2513 implicitly_declare (functionid
)
2517 int traditional_warning
= 0;
2518 /* Only one "implicit declaration" warning per identifier. */
2519 int implicit_warning
;
2521 /* We used to reuse an old implicit decl here,
2522 but this loses with inline functions because it can clobber
2523 the saved decl chains. */
2525 if (IDENTIFIER_IMPLICIT_DECL (functionid
) != 0)
2526 decl
= IDENTIFIER_IMPLICIT_DECL (functionid
);
2529 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2531 /* Warn of implicit decl following explicit local extern decl.
2532 This is probably a program designed for traditional C. */
2533 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2534 traditional_warning
= 1;
2536 /* Warn once of an implicit declaration. */
2537 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2539 DECL_EXTERNAL (decl
) = 1;
2540 TREE_PUBLIC (decl
) = 1;
2542 /* Record that we have an implicit decl and this is it. */
2543 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2545 /* ANSI standard says implicit declarations are in the innermost block.
2546 So we record the decl in the standard fashion.
2547 If flag_traditional is set, pushdecl does it top-level. */
2550 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2551 maybe_objc_check_decl (decl
);
2553 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2555 if (implicit_warning
)
2556 implicit_decl_warning (functionid
);
2557 else if (warn_traditional
&& traditional_warning
)
2558 warning ("function `%s' was previously declared within a block",
2559 IDENTIFIER_POINTER (functionid
));
2561 /* Write a record describing this implicit function declaration to the
2562 prototypes file (if requested). */
2564 gen_aux_info_record (decl
, 0, 1, 0);
2570 implicit_decl_warning (id
)
2573 const char *name
= IDENTIFIER_POINTER (id
);
2574 if (mesg_implicit_function_declaration
== 2)
2575 error ("implicit declaration of function `%s'", name
);
2576 else if (mesg_implicit_function_declaration
== 1)
2577 warning ("implicit declaration of function `%s'", name
);
2580 /* Return zero if the declaration NEWDECL is valid
2581 when the declaration OLDDECL (assumed to be for the same name)
2582 has already been seen.
2583 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2584 and 3 if it is a conflicting declaration. */
2587 redeclaration_error_message (newdecl
, olddecl
)
2588 tree newdecl
, olddecl
;
2590 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2592 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2594 /* pushdecl creates distinct types for TYPE_DECLs by calling
2595 build_type_copy, so the above comparison generally fails. We do
2596 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2597 is equivalent to what this code used to do before the build_type_copy
2598 call. The variant type distinction should not matter for traditional
2599 code, because it doesn't have type qualifiers. */
2600 if (flag_traditional
2601 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2603 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2607 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2609 /* Declarations of functions can insist on internal linkage
2610 but they can't be inconsistent with internal linkage,
2611 so there can be no error on that account.
2612 However defining the same name twice is no good. */
2613 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2614 /* However, defining once as extern inline and a second
2615 time in another way is ok. */
2616 && ! (DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2617 && ! (DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2621 else if (DECL_CONTEXT (newdecl
) == NULL_TREE
)
2623 /* Objects declared at top level: */
2624 /* If at least one is a reference, it's ok. */
2625 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2627 /* Reject two definitions. */
2628 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2630 /* Now we have two tentative defs, or one tentative and one real def. */
2631 /* Insist that the linkage match. */
2632 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2636 else if (current_binding_level
->parm_flag
2637 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2641 /* Newdecl has block scope. If olddecl has block scope also, then
2642 reject two definitions, and reject a definition together with an
2643 external reference. Otherwise, it is OK, because newdecl must
2644 be an extern reference to olddecl. */
2645 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2646 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2652 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2653 Create one if none exists so far for the current function.
2654 This function is called for both label definitions and label references. */
2660 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2662 if (current_function_decl
== 0)
2664 error ("label %s referenced outside of any function",
2665 IDENTIFIER_POINTER (id
));
2669 /* Use a label already defined or ref'd with this name. */
2672 /* But not if it is inherited and wasn't declared to be inheritable. */
2673 if (DECL_CONTEXT (decl
) != current_function_decl
2674 && ! C_DECLARED_LABEL_FLAG (decl
))
2675 return shadow_label (id
);
2679 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2681 /* A label not explicitly declared must be local to where it's ref'd. */
2682 DECL_CONTEXT (decl
) = current_function_decl
;
2684 DECL_MODE (decl
) = VOIDmode
;
2686 /* Say where one reference is to the label,
2687 for the sake of the error if it is not defined. */
2688 DECL_SOURCE_LINE (decl
) = lineno
;
2689 DECL_SOURCE_FILE (decl
) = input_filename
;
2691 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2693 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2698 /* Make a label named NAME in the current function,
2699 shadowing silently any that may be inherited from containing functions
2700 or containing scopes.
2702 Note that valid use, if the label being shadowed
2703 comes from another scope in the same function,
2704 requires calling declare_nonlocal_label right away. */
2710 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2716 /* Check to make sure that the label hasn't already been declared
2717 at this label scope */
2718 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2719 if (TREE_VALUE (dup
) == decl
)
2721 error ("duplicate label declaration `%s'",
2722 IDENTIFIER_POINTER (name
));
2723 error_with_decl (TREE_VALUE (dup
),
2724 "this is a previous declaration");
2725 /* Just use the previous declaration. */
2726 return lookup_label (name
);
2729 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2730 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2733 return lookup_label (name
);
2736 /* Define a label, specifying the location in the source file.
2737 Return the LABEL_DECL node for the label, if the definition is valid.
2738 Otherwise return 0. */
2741 define_label (filename
, line
, name
)
2742 const char *filename
;
2746 tree decl
= lookup_label (name
);
2748 /* If label with this name is known from an outer context, shadow it. */
2749 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2751 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2752 IDENTIFIER_LABEL_VALUE (name
) = 0;
2753 decl
= lookup_label (name
);
2756 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2757 warning_with_file_and_line (filename
, line
,
2758 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2759 IDENTIFIER_POINTER (name
));
2761 if (DECL_INITIAL (decl
) != 0)
2763 error_with_file_and_line (filename
, line
, "duplicate label `%s'",
2764 IDENTIFIER_POINTER (name
));
2769 /* Mark label as having been defined. */
2770 DECL_INITIAL (decl
) = error_mark_node
;
2771 /* Say where in the source. */
2772 DECL_SOURCE_FILE (decl
) = filename
;
2773 DECL_SOURCE_LINE (decl
) = line
;
2778 /* Return the list of declarations of the current level.
2779 Note that this list is in reverse order unless/until
2780 you nreverse it; and when you do nreverse it, you must
2781 store the result back using `storedecls' or you will lose. */
2786 return current_binding_level
->names
;
2789 /* Return the list of type-tags (for structs, etc) of the current level. */
2794 return current_binding_level
->tags
;
2797 /* Store the list of declarations of the current level.
2798 This is done for the parameter declarations of a function being defined,
2799 after they are modified in the light of any missing parameters. */
2805 current_binding_level
->names
= decls
;
2808 /* Similarly, store the list of tags of the current level. */
2814 current_binding_level
->tags
= tags
;
2817 /* Given NAME, an IDENTIFIER_NODE,
2818 return the structure (or union or enum) definition for that name.
2819 Searches binding levels from BINDING_LEVEL up to the global level.
2820 If THISLEVEL_ONLY is nonzero, searches only the specified context
2821 (but skips any tag-transparent contexts to find one that is
2822 meaningful for tags).
2823 CODE says which kind of type the caller wants;
2824 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2825 If the wrong kind of type is found, an error is reported. */
2828 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2829 enum tree_code code
;
2830 struct binding_level
*binding_level
;
2834 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
;
2850 return TREE_VALUE (tail
);
2853 if (thislevel_only
&& ! level
->tag_transparent
)
2859 /* Print an error message now
2860 for a recent invalid struct, union or enum cross reference.
2861 We don't print them immediately because they are not invalid
2862 when used in the `struct foo;' construct for shadowing. */
2865 pending_xref_error ()
2867 if (pending_invalid_xref
!= 0)
2868 error_with_file_and_line (pending_invalid_xref_file
,
2869 pending_invalid_xref_line
,
2870 "`%s' defined as wrong kind of tag",
2871 IDENTIFIER_POINTER (pending_invalid_xref
));
2872 pending_invalid_xref
= 0;
2875 /* Given a type, find the tag that was defined for it and return the tag name.
2876 Otherwise return 0. */
2879 lookup_tag_reverse (type
)
2882 register struct binding_level
*level
;
2884 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2887 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2889 if (TREE_VALUE (tail
) == type
)
2890 return TREE_PURPOSE (tail
);
2896 /* Look up NAME in the current binding level and its superiors
2897 in the namespace of variables, functions and typedefs.
2898 Return a ..._DECL node of some kind representing its definition,
2899 or return 0 if it is undefined. */
2907 if (current_binding_level
!= global_binding_level
2908 && IDENTIFIER_LOCAL_VALUE (name
))
2909 val
= IDENTIFIER_LOCAL_VALUE (name
);
2911 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2915 /* Similar to `lookup_name' but look only at current binding level. */
2918 lookup_name_current_level (name
)
2923 if (current_binding_level
== global_binding_level
)
2924 return IDENTIFIER_GLOBAL_VALUE (name
);
2926 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2929 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2930 if (DECL_NAME (t
) == name
)
2936 /* Mark ARG for GC. */
2939 mark_binding_level (arg
)
2942 struct binding_level
*level
= *(struct binding_level
**) arg
;
2944 for (; level
!= 0; level
= level
->level_chain
)
2946 ggc_mark_tree (level
->names
);
2947 ggc_mark_tree (level
->tags
);
2948 ggc_mark_tree (level
->shadowed
);
2949 ggc_mark_tree (level
->blocks
);
2950 ggc_mark_tree (level
->this_block
);
2951 ggc_mark_tree (level
->parm_order
);
2955 /* Create the predefined scalar types of C,
2956 and some nodes representing standard constants (0, 1, (void *) 0).
2957 Initialize the global binding level.
2958 Make definitions for built-in primitive functions. */
2961 init_decl_processing ()
2963 register tree endlink
;
2964 tree ptr_ftype_void
, ptr_ftype_ptr
;
2965 int wchar_type_size
;
2966 tree array_domain_type
;
2969 current_function_decl
= NULL
;
2970 named_labels
= NULL
;
2971 current_binding_level
= NULL_BINDING_LEVEL
;
2972 free_binding_level
= NULL_BINDING_LEVEL
;
2974 /* Make the binding_level structure for global names. */
2976 global_binding_level
= current_binding_level
;
2978 build_common_tree_nodes (flag_signed_char
);
2980 /* Define `int' and `char' first so that dbx will output them first. */
2981 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2982 integer_type_node
));
2983 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2985 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2986 long_integer_type_node
));
2987 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2988 unsigned_type_node
));
2989 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2990 long_unsigned_type_node
));
2991 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2992 long_long_integer_type_node
));
2993 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2994 long_long_unsigned_type_node
));
2995 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2996 short_integer_type_node
));
2997 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2998 short_unsigned_type_node
));
2999 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
3000 signed_char_type_node
));
3001 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
3002 unsigned_char_type_node
));
3003 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
3004 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
3005 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
3006 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
3007 #if HOST_BITS_PER_WIDE_INT >= 64
3008 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intTI_type_node
));
3010 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
3011 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
3012 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
3013 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
3014 #if HOST_BITS_PER_WIDE_INT >= 64
3015 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intTI_type_node
));
3018 /* `unsigned long' is the standard type for sizeof.
3019 Traditionally, use a signed type.
3020 Note that stddef.h uses `unsigned long',
3021 and this must agree, even if long and int are the same size. */
3022 t
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
3023 signed_size_type_node
= signed_type (t
);
3024 if (flag_traditional
&& TREE_UNSIGNED (t
))
3025 t
= signed_type (t
);
3027 c_size_type_node
= t
;
3030 /* Create the widest literal types. */
3031 widest_integer_literal_type_node
3032 = make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
3033 widest_unsigned_literal_type_node
3034 = make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
3035 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3036 widest_integer_literal_type_node
));
3037 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3038 widest_unsigned_literal_type_node
));
3040 build_common_tree_nodes_2 (flag_short_double
);
3042 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
3044 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
3046 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
3047 long_double_type_node
));
3048 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
3049 complex_integer_type_node
));
3050 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
3051 complex_float_type_node
));
3052 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
3053 complex_double_type_node
));
3054 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
3055 complex_long_double_type_node
));
3056 pushdecl (build_decl (TYPE_DECL
,
3057 ridpointers
[(int) RID_VOID
], void_type_node
));
3059 #ifdef MD_INIT_BUILTINS
3063 wchar_type_node
= get_identifier (flag_short_wchar
3064 ? "short unsigned int"
3066 wchar_type_node
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node
));
3067 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3068 signed_wchar_type_node
= signed_type (wchar_type_node
);
3069 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
3071 boolean_type_node
= integer_type_node
;
3072 boolean_true_node
= integer_one_node
;
3073 boolean_false_node
= integer_zero_node
;
3075 /* With GCC, C99's _Bool is always of size 1. */
3076 c_bool_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
3077 TREE_SET_CODE (c_bool_type_node
, BOOLEAN_TYPE
);
3078 TYPE_MAX_VALUE (c_bool_type_node
) = build_int_2 (1, 0);
3079 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node
)) = c_bool_type_node
;
3080 TYPE_PRECISION (c_bool_type_node
) = 1;
3081 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
3083 c_bool_false_node
= build_int_2 (0, 0);
3084 TREE_TYPE (c_bool_false_node
) = c_bool_type_node
;
3085 c_bool_true_node
= build_int_2 (1, 0);
3086 TREE_TYPE (c_bool_true_node
) = c_bool_type_node
;
3088 /* Make a type to be the domain of a few array types
3089 whose domains don't really matter.
3090 200 is small enough that it always fits in size_t
3091 and large enough that it can hold most function names for the
3092 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3093 array_domain_type
= build_index_type (build_int_2 (200, 0));
3095 /* make a type for arrays of characters.
3096 With luck nothing will ever really depend on the length of this
3098 char_array_type_node
= build_array_type (char_type_node
, array_domain_type
);
3100 /* Likewise for arrays of ints. */
3102 = build_array_type (integer_type_node
, array_domain_type
);
3104 /* This is for wide string constants. */
3105 wchar_array_type_node
3106 = build_array_type (wchar_type_node
, array_domain_type
);
3108 void_list_node
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3110 c_common_nodes_and_builtins ();
3112 endlink
= void_list_node
;
3113 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3115 = build_function_type (ptr_type_node
,
3116 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3118 /* Types which are common to the fortran compiler and libf2c. When
3119 changing these, you also need to be concerned with f/com.h. */
3121 if (TYPE_PRECISION (float_type_node
)
3122 == TYPE_PRECISION (long_integer_type_node
))
3124 g77_integer_type_node
= long_integer_type_node
;
3125 g77_uinteger_type_node
= long_unsigned_type_node
;
3127 else if (TYPE_PRECISION (float_type_node
)
3128 == TYPE_PRECISION (integer_type_node
))
3130 g77_integer_type_node
= integer_type_node
;
3131 g77_uinteger_type_node
= unsigned_type_node
;
3134 g77_integer_type_node
= g77_uinteger_type_node
= NULL_TREE
;
3136 if (g77_integer_type_node
!= NULL_TREE
)
3138 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_integer"),
3139 g77_integer_type_node
));
3140 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_uinteger"),
3141 g77_uinteger_type_node
));
3144 if (TYPE_PRECISION (float_type_node
) * 2
3145 == TYPE_PRECISION (long_integer_type_node
))
3147 g77_longint_type_node
= long_integer_type_node
;
3148 g77_ulongint_type_node
= long_unsigned_type_node
;
3150 else if (TYPE_PRECISION (float_type_node
) * 2
3151 == TYPE_PRECISION (long_long_integer_type_node
))
3153 g77_longint_type_node
= long_long_integer_type_node
;
3154 g77_ulongint_type_node
= long_long_unsigned_type_node
;
3157 g77_longint_type_node
= g77_ulongint_type_node
= NULL_TREE
;
3159 if (g77_longint_type_node
!= NULL_TREE
)
3161 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_longint"),
3162 g77_longint_type_node
));
3163 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_ulongint"),
3164 g77_ulongint_type_node
));
3167 builtin_function ("__builtin_aggregate_incoming_address",
3168 build_function_type (ptr_type_node
, NULL_TREE
),
3169 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
,
3170 BUILT_IN_NORMAL
, NULL_PTR
);
3172 /* Hooks for the DWARF 2 __throw routine. */
3173 builtin_function ("__builtin_unwind_init",
3174 build_function_type (void_type_node
, endlink
),
3175 BUILT_IN_UNWIND_INIT
, BUILT_IN_NORMAL
, NULL_PTR
);
3176 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void
,
3177 BUILT_IN_DWARF_CFA
, BUILT_IN_NORMAL
, NULL_PTR
);
3178 builtin_function ("__builtin_dwarf_fp_regnum",
3179 build_function_type (unsigned_type_node
, endlink
),
3180 BUILT_IN_DWARF_FP_REGNUM
, BUILT_IN_NORMAL
, NULL_PTR
);
3181 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr
,
3182 BUILT_IN_INIT_DWARF_REG_SIZES
, BUILT_IN_NORMAL
, NULL_PTR
);
3183 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3184 BUILT_IN_FROB_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3185 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3186 BUILT_IN_EXTRACT_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3188 ("__builtin_eh_return",
3189 build_function_type (void_type_node
,
3190 tree_cons (NULL_TREE
, ptr_type_node
,
3191 tree_cons (NULL_TREE
,
3192 type_for_mode (ptr_mode
, 0),
3193 tree_cons (NULL_TREE
,
3196 BUILT_IN_EH_RETURN
, BUILT_IN_NORMAL
, NULL_PTR
);
3198 pedantic_lvalues
= pedantic
;
3200 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3202 function_id_node
= get_identifier ("__FUNCTION__");
3203 pretty_function_id_node
= get_identifier ("__PRETTY_FUNCTION__");
3204 func_id_node
= get_identifier ("__func__");
3205 make_fname_decl
= c_make_fname_decl
;
3206 declare_function_name ();
3208 start_identifier_warnings ();
3210 /* Prepare to check format strings against argument lists. */
3211 init_function_format_info ();
3213 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3215 /* Record our roots. */
3217 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3218 ggc_add_root (&c_stmt_tree
, 1, sizeof c_stmt_tree
, mark_stmt_tree
);
3219 ggc_add_tree_root (&c_scope_stmt_stack
, 1);
3220 ggc_add_tree_root (&named_labels
, 1);
3221 ggc_add_tree_root (&shadowed_labels
, 1);
3222 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3223 mark_binding_level
);
3224 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3225 mark_binding_level
);
3226 ggc_add_tree_root (&static_ctors
, 1);
3227 ggc_add_tree_root (&static_dtors
, 1);
3230 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3231 decl, NAME is the initialization string and TYPE_DEP indicates whether
3232 NAME depended on the type of the function. As we don't yet implement
3233 delayed emission of static data, we mark the decl as emitted
3234 so it is not placed in the output. Anything using it must therefore pull
3235 out the STRING_CST initializer directly. This does mean that these names
3236 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3239 c_make_fname_decl (id
, name
, type_dep
)
3242 int type_dep ATTRIBUTE_UNUSED
;
3244 tree decl
, type
, init
;
3245 size_t length
= strlen (name
);
3247 type
= build_array_type
3248 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
3249 build_index_type (build_int_2 (length
, 0)));
3251 decl
= build_decl (VAR_DECL
, id
, type
);
3252 TREE_STATIC (decl
) = 1;
3253 TREE_READONLY (decl
) = 1;
3254 TREE_ASM_WRITTEN (decl
) = 1;
3255 DECL_SOURCE_LINE (decl
) = 0;
3256 DECL_ARTIFICIAL (decl
) = 1;
3257 DECL_IN_SYSTEM_HEADER (decl
) = 1;
3258 DECL_IGNORED_P (decl
) = 1;
3259 init
= build_string (length
+ 1, name
);
3260 TREE_TYPE (init
) = type
;
3261 DECL_INITIAL (decl
) = init
;
3262 finish_decl (pushdecl (decl
), init
, NULL_TREE
);
3267 /* Return a definition for a builtin function named NAME and whose data type
3268 is TYPE. TYPE should be a function type with argument types.
3269 FUNCTION_CODE tells later passes how to compile calls to this function.
3270 See tree.h for its possible values.
3272 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3273 the name to be called if we can't opencode the function. */
3276 builtin_function (name
, type
, function_code
, class, library_name
)
3280 enum built_in_class
class;
3281 const char *library_name
;
3283 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3284 DECL_EXTERNAL (decl
) = 1;
3285 TREE_PUBLIC (decl
) = 1;
3286 /* If -traditional, permit redefining a builtin function any way you like.
3287 (Though really, if the program redefines these functions,
3288 it probably won't work right unless compiled with -fno-builtin.) */
3289 if (flag_traditional
&& name
[0] != '_')
3290 DECL_BUILT_IN_NONANSI (decl
) = 1;
3292 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3293 make_decl_rtl (decl
, NULL_PTR
, 1);
3295 DECL_BUILT_IN_CLASS (decl
) = class;
3296 DECL_FUNCTION_CODE (decl
) = function_code
;
3298 /* Warn if a function in the namespace for users
3299 is used without an occasion to consider it declared. */
3300 if (name
[0] != '_' || name
[1] != '_')
3301 C_DECL_ANTICIPATED (decl
) = 1;
3306 /* Called when a declaration is seen that contains no names to declare.
3307 If its type is a reference to a structure, union or enum inherited
3308 from a containing scope, shadow that tag name for the current scope
3309 with a forward reference.
3310 If its type defines a new named structure or union
3311 or defines an enum, it is valid but we need not do anything here.
3312 Otherwise, it is an error. */
3315 shadow_tag (declspecs
)
3318 shadow_tag_warned (declspecs
, 0);
3322 shadow_tag_warned (declspecs
, warned
)
3325 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3332 pending_invalid_xref
= 0;
3334 /* Remove the attributes from declspecs, since they will confuse the
3336 split_specs_attrs (declspecs
, &specs
, &attrs
);
3338 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3340 register tree value
= TREE_VALUE (link
);
3341 register enum tree_code code
= TREE_CODE (value
);
3343 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3344 /* Used to test also that TYPE_SIZE (value) != 0.
3345 That caused warning for `struct foo;' at top level in the file. */
3347 register tree name
= lookup_tag_reverse (value
);
3354 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3355 /* Empty unnamed enum OK */
3357 pedwarn ("unnamed struct/union that defines no instances");
3363 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3367 t
= make_node (code
);
3374 if (!warned
&& ! in_system_header
)
3376 warning ("useless keyword or type name in empty declaration");
3383 error ("two types specified in one empty declaration");
3388 pedwarn ("empty declaration");
3392 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3395 groktypename (typename
)
3398 if (TREE_CODE (typename
) != TREE_LIST
)
3400 return grokdeclarator (TREE_VALUE (typename
),
3401 TREE_PURPOSE (typename
),
3405 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3408 groktypename_in_parm_context (typename
)
3411 if (TREE_CODE (typename
) != TREE_LIST
)
3413 return grokdeclarator (TREE_VALUE (typename
),
3414 TREE_PURPOSE (typename
),
3418 /* Decode a declarator in an ordinary declaration or data definition.
3419 This is called as soon as the type information and variable name
3420 have been parsed, before parsing the initializer if any.
3421 Here we create the ..._DECL node, fill in its type,
3422 and put it on the list of decls for the current context.
3423 The ..._DECL node is returned as the value.
3425 Exception: for arrays where the length is not specified,
3426 the type is left null, to be filled in by `finish_decl'.
3428 Function definitions do not come here; they go to start_function
3429 instead. However, external and forward declarations of functions
3430 do go through here. Structure field declarations are done by
3431 grokfield and not through here. */
3434 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3435 tree declarator
, declspecs
;
3437 tree attributes
, prefix_attributes
;
3439 register tree decl
= grokdeclarator (declarator
, declspecs
,
3440 NORMAL
, initialized
);
3443 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3444 && MAIN_NAME_P (DECL_NAME (decl
)))
3445 warning_with_decl (decl
, "`%s' is usually a function");
3448 /* Is it valid for this decl to have an initializer at all?
3449 If not, set INITIALIZED to zero, which will indirectly
3450 tell `finish_decl' to ignore the initializer once it is parsed. */
3451 switch (TREE_CODE (decl
))
3454 /* typedef foo = bar means give foo the same type as bar.
3455 We haven't parsed bar yet, so `finish_decl' will fix that up.
3456 Any other case of an initialization in a TYPE_DECL is an error. */
3457 if (pedantic
|| list_length (declspecs
) > 1)
3459 error ("typedef `%s' is initialized",
3460 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3466 error ("function `%s' is initialized like a variable",
3467 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3472 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3473 error ("parameter `%s' is initialized",
3474 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3479 /* Don't allow initializations for incomplete types
3480 except for arrays which might be completed by the initialization. */
3482 /* This can happen if the array size is an undefined macro. We already
3483 gave a warning, so we don't need another one. */
3484 if (TREE_TYPE (decl
) == error_mark_node
)
3486 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3488 /* A complete type is ok if size is fixed. */
3490 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3491 || C_DECL_VARIABLE_SIZE (decl
))
3493 error ("variable-sized object may not be initialized");
3497 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3499 error ("variable `%s' has initializer but incomplete type",
3500 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3503 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
3505 error ("elements of array `%s' have incomplete type",
3506 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3514 /* Seems redundant with grokdeclarator. */
3515 if (current_binding_level
!= global_binding_level
3516 && DECL_EXTERNAL (decl
)
3517 && TREE_CODE (decl
) != FUNCTION_DECL
)
3518 warning ("declaration of `%s' has `extern' and is initialized",
3519 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3521 DECL_EXTERNAL (decl
) = 0;
3522 if (current_binding_level
== global_binding_level
)
3523 TREE_STATIC (decl
) = 1;
3525 /* Tell `pushdecl' this is an initialized decl
3526 even though we don't yet have the initializer expression.
3527 Also tell `finish_decl' it may store the real initializer. */
3528 DECL_INITIAL (decl
) = error_mark_node
;
3531 /* If this is a function declaration, write a record describing it to the
3532 prototypes file (if requested). */
3534 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3535 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3537 /* ANSI specifies that a tentative definition which is not merged with
3538 a non-tentative definition behaves exactly like a definition with an
3539 initializer equal to zero. (Section 3.7.2)
3540 -fno-common gives strict ANSI behavior. Usually you don't want it.
3541 This matters only for variables with external linkage. */
3542 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3543 DECL_COMMON (decl
) = 1;
3545 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3546 SET_DEFAULT_DECL_ATTRIBUTES (decl
, attributes
);
3549 /* Set attributes here so if duplicate decl, will have proper attributes. */
3550 decl_attributes (decl
, attributes
, prefix_attributes
);
3552 /* Add this decl to the current binding level.
3553 TEM may equal DECL or it may be a previous decl of the same name. */
3554 tem
= pushdecl (decl
);
3556 /* For a local variable, define the RTL now. */
3557 if (current_binding_level
!= global_binding_level
3558 /* But not if this is a duplicate decl
3559 and we preserved the rtl from the previous one
3560 (which may or may not happen). */
3561 && DECL_RTL (tem
) == 0
3562 && !DECL_CONTEXT (tem
))
3564 if (TREE_TYPE (tem
) != error_mark_node
3565 && COMPLETE_TYPE_P (TREE_TYPE (tem
)))
3567 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3568 && DECL_INITIAL (tem
) != 0)
3575 /* Finish processing of a declaration;
3576 install its initial value.
3577 If the length of an array type is not known before,
3578 it must be determined now, from the initial value, or it is an error. */
3581 finish_decl (decl
, init
, asmspec_tree
)
3585 register tree type
= TREE_TYPE (decl
);
3586 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3587 const char *asmspec
= 0;
3589 /* If a name was specified, get the string. */
3591 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3593 /* If `start_decl' didn't like having an initialization, ignore it now. */
3595 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3597 /* Don't crash if parm is initialized. */
3598 if (TREE_CODE (decl
) == PARM_DECL
)
3603 if (TREE_CODE (decl
) != TYPE_DECL
)
3604 store_init_value (decl
, init
);
3607 /* typedef foo = bar; store the type of bar as the type of foo. */
3608 TREE_TYPE (decl
) = TREE_TYPE (init
);
3609 DECL_INITIAL (decl
) = init
= 0;
3613 /* Deduce size of array from initialization, if not already known */
3615 if (TREE_CODE (type
) == ARRAY_TYPE
3616 && TYPE_DOMAIN (type
) == 0
3617 && TREE_CODE (decl
) != TYPE_DECL
)
3620 = (TREE_STATIC (decl
)
3621 /* Even if pedantic, an external linkage array
3622 may have incomplete type at first. */
3623 ? pedantic
&& !TREE_PUBLIC (decl
)
3624 : !DECL_EXTERNAL (decl
));
3626 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3628 /* Get the completed type made by complete_array_type. */
3629 type
= TREE_TYPE (decl
);
3632 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3634 else if (failure
== 2)
3637 error_with_decl (decl
, "array size missing in `%s'");
3638 /* If a `static' var's size isn't known,
3639 make it extern as well as static, so it does not get
3641 If it is not `static', then do not mark extern;
3642 finish_incomplete_decl will give it a default size
3643 and it will get allocated. */
3644 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3645 DECL_EXTERNAL (decl
) = 1;
3648 /* TYPE_MAX_VALUE is always one less than the number of elements
3649 in the array, because we start counting at zero. Therefore,
3650 warn only if the value is less than zero. */
3651 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
3652 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3653 error_with_decl (decl
, "zero or negative size array `%s'");
3655 layout_decl (decl
, 0);
3658 if (TREE_CODE (decl
) == VAR_DECL
)
3660 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3661 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3662 layout_decl (decl
, 0);
3664 if (DECL_SIZE (decl
) == 0
3665 /* Don't give an error if we already gave one earlier. */
3666 && TREE_TYPE (decl
) != error_mark_node
3667 && (TREE_STATIC (decl
)
3669 /* A static variable with an incomplete type
3670 is an error if it is initialized.
3671 Also if it is not file scope.
3672 Otherwise, let it through, but if it is not `extern'
3673 then it may cause an error message later. */
3674 (DECL_INITIAL (decl
) != 0
3675 || DECL_CONTEXT (decl
) != 0)
3677 /* An automatic variable with an incomplete type
3679 !DECL_EXTERNAL (decl
)))
3681 error_with_decl (decl
, "storage size of `%s' isn't known");
3682 TREE_TYPE (decl
) = error_mark_node
;
3685 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3686 && DECL_SIZE (decl
) != 0)
3688 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3689 constant_expression_warning (DECL_SIZE (decl
));
3691 error_with_decl (decl
, "storage size of `%s' isn't constant");
3694 if (TREE_USED (type
))
3695 TREE_USED (decl
) = 1;
3698 /* If this is a function and an assembler name is specified, it isn't
3699 builtin any more. Also reset DECL_RTL so we can give it its new
3701 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3703 DECL_BUILT_IN_CLASS (decl
) = NOT_BUILT_IN
;
3704 DECL_RTL (decl
) = 0;
3705 DECL_ASSEMBLER_NAME (decl
) = get_identifier (asmspec
);
3708 /* Output the assembler code and/or RTL code for variables and functions,
3709 unless the type is an undefined structure or union.
3710 If not, it will get done when the type is completed. */
3712 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3714 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3715 maybe_objc_check_decl (decl
);
3717 if (!DECL_CONTEXT (decl
))
3718 rest_of_decl_compilation (decl
, asmspec
,
3719 (DECL_CONTEXT (decl
) == 0
3720 || TREE_ASM_WRITTEN (decl
)), 0);
3725 DECL_ASSEMBLER_NAME (decl
) = get_identifier (asmspec
);
3726 DECL_C_HARD_REGISTER (decl
) = 1;
3728 add_decl_stmt (decl
);
3731 if (DECL_CONTEXT (decl
) != 0)
3733 /* Recompute the RTL of a local array now
3734 if it used to be an incomplete type. */
3736 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3738 /* If we used it already as memory, it must stay in memory. */
3739 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3740 /* If it's still incomplete now, no init will save it. */
3741 if (DECL_SIZE (decl
) == 0)
3742 DECL_INITIAL (decl
) = 0;
3747 if (TREE_CODE (decl
) == TYPE_DECL
)
3749 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3750 maybe_objc_check_decl (decl
);
3751 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0, 0);
3754 /* At the end of a declaration, throw away any variable type sizes
3755 of types defined inside that declaration. There is no use
3756 computing them in the following function definition. */
3757 if (current_binding_level
== global_binding_level
)
3758 get_pending_sizes ();
3761 /* If DECL has a cleanup, build and return that cleanup here.
3762 This is a callback called by expand_expr. */
3765 maybe_build_cleanup (decl
)
3766 tree decl ATTRIBUTE_UNUSED
;
3768 /* There are no cleanups in C. */
3772 /* Given a parsed parameter declaration,
3773 decode it into a PARM_DECL and push that on the current binding level.
3774 Also, for the sake of forward parm decls,
3775 record the given order of parms in `parm_order'. */
3778 push_parm_decl (parm
)
3782 int old_immediate_size_expand
= immediate_size_expand
;
3783 /* Don't try computing parm sizes now -- wait till fn is called. */
3784 immediate_size_expand
= 0;
3786 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3787 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3788 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3789 TREE_PURPOSE (TREE_VALUE (parm
)));
3792 if (DECL_NAME (decl
))
3795 olddecl
= lookup_name (DECL_NAME (decl
));
3796 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3797 pedwarn_with_decl (decl
,
3798 "ANSI C forbids parameter `%s' shadowing typedef");
3802 decl
= pushdecl (decl
);
3804 immediate_size_expand
= old_immediate_size_expand
;
3806 current_binding_level
->parm_order
3807 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3809 /* Add this decl to the current binding level. */
3810 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3813 /* Clear the given order of parms in `parm_order'.
3814 Used at start of parm list,
3815 and also at semicolon terminating forward decls. */
3820 current_binding_level
->parm_order
= NULL_TREE
;
3823 /* Make TYPE a complete type based on INITIAL_VALUE.
3824 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3825 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3828 complete_array_type (type
, initial_value
, do_default
)
3833 register tree maxindex
= NULL_TREE
;
3838 /* Note MAXINDEX is really the maximum index,
3839 one less than the size. */
3840 if (TREE_CODE (initial_value
) == STRING_CST
)
3843 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3844 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3847 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3849 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3850 maxindex
= build_int_2 (-1, -1);
3851 for (; elts
; elts
= TREE_CHAIN (elts
))
3853 if (TREE_PURPOSE (elts
))
3854 maxindex
= TREE_PURPOSE (elts
);
3856 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3857 maxindex
, integer_one_node
));
3859 maxindex
= copy_node (maxindex
);
3863 /* Make an error message unless that happened already. */
3864 if (initial_value
!= error_mark_node
)
3867 /* Prevent further error messages. */
3868 maxindex
= build_int_2 (0, 0);
3875 maxindex
= build_int_2 (0, 0);
3881 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3882 if (!TREE_TYPE (maxindex
))
3883 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3886 /* Lay out the type now that we can get the real answer. */
3893 /* Given declspecs and a declarator,
3894 determine the name and type of the object declared
3895 and construct a ..._DECL node for it.
3896 (In one case we can return a ..._TYPE node instead.
3897 For invalid input we sometimes return 0.)
3899 DECLSPECS is a chain of tree_list nodes whose value fields
3900 are the storage classes and type specifiers.
3902 DECL_CONTEXT says which syntactic context this declaration is in:
3903 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3904 FUNCDEF for a function definition. Like NORMAL but a few different
3905 error messages in each case. Return value may be zero meaning
3906 this definition is too screwy to try to parse.
3907 PARM for a parameter declaration (either within a function prototype
3908 or before a function body). Make a PARM_DECL, or return void_type_node.
3909 TYPENAME if for a typename (in a cast or sizeof).
3910 Don't make a DECL node; just return the ..._TYPE node.
3911 FIELD for a struct or union field; make a FIELD_DECL.
3912 BITFIELD for a field with specified width.
3913 INITIALIZED is 1 if the decl has an initializer.
3915 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3916 It may also be so in the PARM case, for a prototype where the
3917 argument type is specified but not the name.
3919 This function is where the complicated C meanings of `static'
3920 and `extern' are interpreted. */
3923 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
3926 enum decl_context decl_context
;
3931 tree type
= NULL_TREE
;
3936 int type_quals
= TYPE_UNQUALIFIED
;
3938 int explicit_int
= 0;
3939 int explicit_char
= 0;
3940 int defaulted_int
= 0;
3941 tree typedef_decl
= 0;
3943 tree typedef_type
= 0;
3944 int funcdef_flag
= 0;
3945 enum tree_code innermost_code
= ERROR_MARK
;
3947 int size_varies
= 0;
3948 tree decl_machine_attr
= NULL_TREE
;
3950 if (decl_context
== BITFIELD
)
3951 bitfield
= 1, decl_context
= FIELD
;
3953 if (decl_context
== FUNCDEF
)
3954 funcdef_flag
= 1, decl_context
= NORMAL
;
3956 /* Look inside a declarator for the name being declared
3957 and get it as a string, for an error message. */
3959 register tree decl
= declarator
;
3963 switch (TREE_CODE (decl
))
3968 innermost_code
= TREE_CODE (decl
);
3969 decl
= TREE_OPERAND (decl
, 0);
3972 case IDENTIFIER_NODE
:
3973 name
= IDENTIFIER_POINTER (decl
);
3984 /* A function definition's declarator must have the form of
3985 a function declarator. */
3987 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3990 /* Anything declared one level down from the top level
3991 must be one of the parameters of a function
3992 (because the body is at least two levels down). */
3994 /* If this looks like a function definition, make it one,
3995 even if it occurs where parms are expected.
3996 Then store_parm_decls will reject it and not use it as a parm. */
3997 if (decl_context
== NORMAL
&& !funcdef_flag
3998 && current_binding_level
->parm_flag
)
3999 decl_context
= PARM
;
4001 /* Look through the decl specs and record which ones appear.
4002 Some typespecs are defined as built-in typenames.
4003 Others, the ones that are modifiers of other types,
4004 are represented by bits in SPECBITS: set the bits for
4005 the modifiers that appear. Storage class keywords are also in SPECBITS.
4007 If there is a typedef name or a type, store the type in TYPE.
4008 This includes builtin typedefs such as `int'.
4010 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4011 and did not come from a user typedef.
4013 Set LONGLONG if `long' is mentioned twice. */
4015 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4017 register tree id
= TREE_VALUE (spec
);
4019 if (id
== ridpointers
[(int) RID_INT
])
4021 if (id
== ridpointers
[(int) RID_CHAR
])
4024 if (TREE_CODE (id
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (id
))
4026 enum rid i
= C_RID_CODE (id
);
4027 if (i
<= RID_LAST_MODIFIER
)
4029 if (i
== RID_LONG
&& specbits
& (1<<i
))
4032 error ("`long long long' is too long for GCC");
4035 if (pedantic
&& !flag_isoc99
&& ! in_system_header
4037 pedwarn ("ISO C89 does not support `long long'");
4041 else if (specbits
& (1 << i
))
4042 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4048 error ("two or more data types in declaration of `%s'", name
);
4049 /* Actual typedefs come to us as TYPE_DECL nodes. */
4050 else if (TREE_CODE (id
) == TYPE_DECL
)
4052 type
= TREE_TYPE (id
);
4053 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4056 /* Built-in types come as identifiers. */
4057 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4059 register tree t
= lookup_name (id
);
4060 if (TREE_TYPE (t
) == error_mark_node
)
4062 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4063 error ("`%s' fails to be a typedef or built in type",
4064 IDENTIFIER_POINTER (id
));
4067 type
= TREE_TYPE (t
);
4071 else if (TREE_CODE (id
) != ERROR_MARK
)
4078 typedef_type
= type
;
4080 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4082 /* No type at all: default to `int', and set DEFAULTED_INT
4083 because it was not a user-defined typedef. */
4087 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4088 | (1 << (int) RID_SIGNED
)
4089 | (1 << (int) RID_UNSIGNED
)
4090 | (1 << (int) RID_COMPLEX
))))
4091 /* Don't warn about typedef foo = bar. */
4092 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4093 && ! in_system_header
)
4095 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4096 and this is a function, or if -Wimplicit; prefer the former
4097 warning since it is more explicit. */
4098 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4099 warn_about_return_type
= 1;
4100 else if (warn_implicit_int
|| flag_isoc99
)
4101 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4106 type
= integer_type_node
;
4109 /* Now process the modifiers that were specified
4110 and check for invalid combinations. */
4112 /* Long double is a special combination. */
4114 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4115 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4117 specbits
&= ~(1 << (int) RID_LONG
);
4118 type
= long_double_type_node
;
4121 /* Check all other uses of type modifiers. */
4123 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4124 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4128 if ((specbits
& 1 << (int) RID_LONG
)
4129 && (specbits
& 1 << (int) RID_SHORT
))
4130 error ("both long and short specified for `%s'", name
);
4131 else if (((specbits
& 1 << (int) RID_LONG
)
4132 || (specbits
& 1 << (int) RID_SHORT
))
4134 error ("long or short specified with char for `%s'", name
);
4135 else if (((specbits
& 1 << (int) RID_LONG
)
4136 || (specbits
& 1 << (int) RID_SHORT
))
4137 && TREE_CODE (type
) == REAL_TYPE
)
4139 static int already
= 0;
4141 error ("long or short specified with floating type for `%s'", name
);
4142 if (! already
&& ! pedantic
)
4144 error ("the only valid combination is `long double'");
4148 else if ((specbits
& 1 << (int) RID_SIGNED
)
4149 && (specbits
& 1 << (int) RID_UNSIGNED
))
4150 error ("both signed and unsigned specified for `%s'", name
);
4151 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4152 error ("long, short, signed or unsigned invalid for `%s'", name
);
4156 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4158 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4160 if (flag_pedantic_errors
)
4165 /* Discard the type modifiers if they are invalid. */
4168 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4169 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4174 if ((specbits
& (1 << (int) RID_COMPLEX
))
4175 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4177 error ("complex invalid for `%s'", name
);
4178 specbits
&= ~(1 << (int) RID_COMPLEX
);
4181 /* Decide whether an integer type is signed or not.
4182 Optionally treat bitfields as signed by default. */
4183 if (specbits
& 1 << (int) RID_UNSIGNED
4184 /* Traditionally, all bitfields are unsigned. */
4185 || (bitfield
&& flag_traditional
4186 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4187 || (bitfield
&& ! flag_signed_bitfields
4188 && (explicit_int
|| defaulted_int
|| explicit_char
4189 /* A typedef for plain `int' without `signed'
4190 can be controlled just like plain `int'. */
4191 || ! (typedef_decl
!= 0
4192 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4193 && TREE_CODE (type
) != ENUMERAL_TYPE
4194 && !(specbits
& 1 << (int) RID_SIGNED
)))
4197 type
= long_long_unsigned_type_node
;
4198 else if (specbits
& 1 << (int) RID_LONG
)
4199 type
= long_unsigned_type_node
;
4200 else if (specbits
& 1 << (int) RID_SHORT
)
4201 type
= short_unsigned_type_node
;
4202 else if (type
== char_type_node
)
4203 type
= unsigned_char_type_node
;
4204 else if (typedef_decl
)
4205 type
= unsigned_type (type
);
4207 type
= unsigned_type_node
;
4209 else if ((specbits
& 1 << (int) RID_SIGNED
)
4210 && type
== char_type_node
)
4211 type
= signed_char_type_node
;
4213 type
= long_long_integer_type_node
;
4214 else if (specbits
& 1 << (int) RID_LONG
)
4215 type
= long_integer_type_node
;
4216 else if (specbits
& 1 << (int) RID_SHORT
)
4217 type
= short_integer_type_node
;
4219 if (specbits
& 1 << (int) RID_COMPLEX
)
4221 if (pedantic
&& !flag_isoc99
)
4222 pedwarn ("ISO C89 does not support complex types");
4223 /* If we just have "complex", it is equivalent to
4224 "complex double", but if any modifiers at all are specified it is
4225 the complex form of TYPE. E.g, "complex short" is
4226 "complex short int". */
4228 if (defaulted_int
&& ! longlong
4229 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4230 | (1 << (int) RID_SIGNED
)
4231 | (1 << (int) RID_UNSIGNED
))))
4234 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4235 type
= complex_double_type_node
;
4237 else if (type
== integer_type_node
)
4240 pedwarn ("ISO C does not support complex integer types");
4241 type
= complex_integer_type_node
;
4243 else if (type
== float_type_node
)
4244 type
= complex_float_type_node
;
4245 else if (type
== double_type_node
)
4246 type
= complex_double_type_node
;
4247 else if (type
== long_double_type_node
)
4248 type
= complex_long_double_type_node
;
4252 pedwarn ("ISO C does not support complex integer types");
4253 type
= build_complex_type (type
);
4257 /* Figure out the type qualifiers for the declaration. There are
4258 two ways a declaration can become qualified. One is something
4259 like `const int i' where the `const' is explicit. Another is
4260 something like `typedef const int CI; CI i' where the type of the
4261 declaration contains the `const'. */
4262 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4263 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4264 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4265 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4266 if (constp
> 1 && ! flag_isoc99
)
4267 pedwarn ("duplicate `const'");
4268 if (restrictp
> 1 && ! flag_isoc99
)
4269 pedwarn ("duplicate `restrict'");
4270 if (volatilep
> 1 && ! flag_isoc99
)
4271 pedwarn ("duplicate `volatile'");
4272 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4273 type
= TYPE_MAIN_VARIANT (type
);
4274 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4275 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4276 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4278 /* Warn if two storage classes are given. Default to `auto'. */
4283 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4284 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4285 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4286 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4287 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4289 /* Warn about storage classes that are invalid for certain
4290 kinds of declarations (parameters, typenames, etc.). */
4293 error ("multiple storage classes in declaration of `%s'", name
);
4294 else if (funcdef_flag
4296 & ((1 << (int) RID_REGISTER
)
4297 | (1 << (int) RID_AUTO
)
4298 | (1 << (int) RID_TYPEDEF
))))
4300 if (specbits
& 1 << (int) RID_AUTO
4301 && (pedantic
|| current_binding_level
== global_binding_level
))
4302 pedwarn ("function definition declared `auto'");
4303 if (specbits
& 1 << (int) RID_REGISTER
)
4304 error ("function definition declared `register'");
4305 if (specbits
& 1 << (int) RID_TYPEDEF
)
4306 error ("function definition declared `typedef'");
4307 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4308 | (1 << (int) RID_AUTO
));
4310 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4312 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4316 switch (decl_context
)
4319 error ("storage class specified for structure field `%s'",
4323 error ("storage class specified for parameter `%s'", name
);
4326 error ("storage class specified for typename");
4329 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4330 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4331 | (1 << (int) RID_EXTERN
));
4334 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4336 /* `extern' with initialization is invalid if not at top level. */
4337 if (current_binding_level
== global_binding_level
)
4338 warning ("`%s' initialized and declared `extern'", name
);
4340 error ("`%s' has both `extern' and initializer", name
);
4342 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4343 && current_binding_level
!= global_binding_level
)
4344 error ("nested function `%s' declared `extern'", name
);
4345 else if (current_binding_level
== global_binding_level
4346 && specbits
& (1 << (int) RID_AUTO
))
4347 error ("top-level declaration of `%s' specifies `auto'", name
);
4350 /* Now figure out the structure of the declarator proper.
4351 Descend through it, creating more complex types, until we reach
4352 the declared identifier (or NULL_TREE, in an absolute declarator). */
4354 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4356 if (type
== error_mark_node
)
4358 declarator
= TREE_OPERAND (declarator
, 0);
4362 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4363 an INDIRECT_REF (for *...),
4364 a CALL_EXPR (for ...(...)),
4365 an identifier (for the name being declared)
4366 or a null pointer (for the place in an absolute declarator
4367 where the name was omitted).
4368 For the last two cases, we have just exited the loop.
4370 At this point, TYPE is the type of elements of an array,
4371 or for a function to return, or for a pointer to point to.
4372 After this sequence of ifs, TYPE is the type of the
4373 array or function or pointer, and DECLARATOR has had its
4374 outermost layer removed. */
4376 if (TREE_CODE (declarator
) == ARRAY_REF
)
4378 register tree itype
= NULL_TREE
;
4379 register tree size
= TREE_OPERAND (declarator
, 1);
4380 /* The index is a signed object `sizetype' bits wide. */
4381 tree index_type
= signed_type (sizetype
);
4383 declarator
= TREE_OPERAND (declarator
, 0);
4385 /* Check for some types that there cannot be arrays of. */
4387 if (VOID_TYPE_P (type
))
4389 error ("declaration of `%s' as array of voids", name
);
4390 type
= error_mark_node
;
4393 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4395 error ("declaration of `%s' as array of functions", name
);
4396 type
= error_mark_node
;
4399 if (size
== error_mark_node
)
4400 type
= error_mark_node
;
4402 if (type
== error_mark_node
)
4405 /* If size was specified, set ITYPE to a range-type for that size.
4406 Otherwise, ITYPE remains null. finish_decl may figure it out
4407 from an initial value. */
4411 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4412 STRIP_TYPE_NOPS (size
);
4414 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4415 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4417 error ("size of array `%s' has non-integer type", name
);
4418 size
= integer_one_node
;
4421 if (pedantic
&& integer_zerop (size
))
4422 pedwarn ("ISO C forbids zero-size array `%s'", name
);
4424 if (TREE_CODE (size
) == INTEGER_CST
)
4426 constant_expression_warning (size
);
4427 if (tree_int_cst_sgn (size
) < 0)
4429 error ("size of array `%s' is negative", name
);
4430 size
= integer_one_node
;
4435 /* Make sure the array size remains visibly nonconstant
4436 even if it is (eg) a const variable with known value. */
4441 if (TREE_CONSTANT (size
))
4442 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4445 pedwarn ("ISO C89 forbids variable-size array `%s'",
4450 if (integer_zerop (size
))
4452 /* A zero-length array cannot be represented with an
4453 unsigned index type, which is what we'll get with
4454 build_index_type. Create an open-ended range instead. */
4455 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4459 /* Compute the maximum valid index, that is, size - 1.
4460 Do the calculation in index_type, so that if it is
4461 a variable the computations will be done in the
4463 itype
= fold (build (MINUS_EXPR
, index_type
,
4464 convert (index_type
, size
),
4465 convert (index_type
, size_one_node
)));
4467 /* If that overflowed, the array is too big.
4468 ??? While a size of INT_MAX+1 technically shouldn't
4469 cause an overflow (because we subtract 1), the overflow
4470 is recorded during the conversion to index_type, before
4471 the subtraction. Handling this case seems like an
4472 unnecessary complication. */
4473 if (TREE_OVERFLOW (itype
))
4475 error ("size of array `%s' is too large", name
);
4476 type
= error_mark_node
;
4481 itype
= variable_size (itype
);
4482 itype
= build_index_type (itype
);
4485 else if (decl_context
== FIELD
)
4487 /* ??? Need to check somewhere that this is a structure
4488 and not a union, that this field is last, and that
4489 this structure has at least one other named member. */
4491 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4492 pedwarn ("ISO C89 does not support flexible array members");
4494 /* ISO C99 Flexible array members are effectively identical
4495 to GCC's zero-length array extension. */
4496 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4499 /* If pedantic, complain about arrays of incomplete types. */
4501 if (pedantic
&& !COMPLETE_TYPE_P (type
))
4502 pedwarn ("array type has incomplete element type");
4505 /* We shouldn't have a function type here at all!
4506 Functions aren't allowed as array elements. */
4507 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4508 && (constp
|| volatilep
))
4509 pedwarn ("ANSI C forbids const or volatile function types");
4512 /* Build the array type itself, then merge any constancy or
4513 volatility into the target type. We must do it in this order
4514 to ensure that the TYPE_MAIN_VARIANT field of the array type
4515 is set correctly. */
4517 type
= build_array_type (type
, itype
);
4519 type
= c_build_qualified_type (type
, type_quals
);
4522 C_TYPE_VARIABLE_SIZE (type
) = 1;
4524 /* The GCC extension for zero-length arrays differs from
4525 ISO flexible array members in that sizeof yields zero. */
4526 if (size
&& integer_zerop (size
))
4529 TYPE_SIZE (type
) = bitsize_zero_node
;
4530 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4533 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4537 /* Declaring a function type.
4538 Make sure we have a valid type for the function to return. */
4539 if (type
== error_mark_node
)
4544 /* Warn about some types functions can't return. */
4546 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4548 error ("`%s' declared as function returning a function", name
);
4549 type
= integer_type_node
;
4551 if (TREE_CODE (type
) == ARRAY_TYPE
)
4553 error ("`%s' declared as function returning an array", name
);
4554 type
= integer_type_node
;
4557 #ifndef TRADITIONAL_RETURN_FLOAT
4558 /* Traditionally, declaring return type float means double. */
4560 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4561 type
= double_type_node
;
4562 #endif /* TRADITIONAL_RETURN_FLOAT */
4564 /* Construct the function type and go to the next
4565 inner layer of declarator. */
4567 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4569 /* Say it's a definition
4570 only for the CALL_EXPR
4571 closest to the identifier. */
4572 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4573 /* Type qualifiers before the return type of the function
4574 qualify the return type, not the function type. */
4577 /* Type qualifiers on a function return type are normally
4578 permitted by the standard but have no effect, so give a
4579 warning at -W. Qualifiers on a void return type have
4580 meaning as a GNU extension, and are banned on function
4581 definitions in ISO C. FIXME: strictly we shouldn't
4582 pedwarn for qualified void return types except on function
4583 definitions, but not doing so could lead to the undesirable
4584 state of a "volatile void" function return type not being
4585 warned about, and a use of the function being compiled
4586 with GNU semantics, with no diagnostics under -pedantic. */
4587 if (VOID_TYPE_P (type
) && pedantic
&& !in_system_header
)
4588 pedwarn ("ISO C forbids qualified void function return type");
4589 else if (extra_warnings
4590 && !(VOID_TYPE_P (type
)
4591 && type_quals
== TYPE_QUAL_VOLATILE
))
4592 warning ("type qualifiers ignored on function return type");
4594 type
= c_build_qualified_type (type
, type_quals
);
4596 type_quals
= TYPE_UNQUALIFIED
;
4598 type
= build_function_type (type
, arg_types
);
4599 declarator
= TREE_OPERAND (declarator
, 0);
4601 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4602 the formal parameter list of this FUNCTION_TYPE to point to
4603 the FUNCTION_TYPE node itself. */
4608 for (link
= last_function_parm_tags
;
4610 link
= TREE_CHAIN (link
))
4611 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4614 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4616 /* Merge any constancy or volatility into the target type
4619 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4621 pedwarn ("ISO C forbids qualified function types");
4623 type
= c_build_qualified_type (type
, type_quals
);
4624 type_quals
= TYPE_UNQUALIFIED
;
4627 type
= build_pointer_type (type
);
4629 /* Process a list of type modifier keywords
4630 (such as const or volatile) that were given inside the `*'. */
4632 if (TREE_TYPE (declarator
))
4634 register tree typemodlist
;
4640 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4641 typemodlist
= TREE_CHAIN (typemodlist
))
4643 tree qualifier
= TREE_VALUE (typemodlist
);
4645 if (C_IS_RESERVED_WORD (qualifier
))
4647 if (C_RID_CODE (qualifier
) == RID_CONST
)
4649 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4651 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4661 error ("invalid type modifier within pointer declarator");
4662 if (constp
> 1 && ! flag_isoc99
)
4663 pedwarn ("duplicate `const'");
4664 if (volatilep
> 1 && ! flag_isoc99
)
4665 pedwarn ("duplicate `volatile'");
4666 if (restrictp
> 1 && ! flag_isoc99
)
4667 pedwarn ("duplicate `restrict'");
4669 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4670 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4671 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4674 declarator
= TREE_OPERAND (declarator
, 0);
4681 /* Now TYPE has the actual type. */
4683 /* Did array size calculations overflow? */
4685 if (TREE_CODE (type
) == ARRAY_TYPE
4686 && COMPLETE_TYPE_P (type
)
4687 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4689 error ("size of array `%s' is too large", name
);
4690 /* If we proceed with the array type as it is, we'll eventully
4691 crash in tree_low_cst(). */
4692 type
= error_mark_node
;
4695 /* If this is declaring a typedef name, return a TYPE_DECL. */
4697 if (specbits
& (1 << (int) RID_TYPEDEF
))
4700 /* Note that the grammar rejects storage classes
4701 in typenames, fields or parameters */
4702 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4704 pedwarn ("ISO C forbids qualified function types");
4706 type
= c_build_qualified_type (type
, type_quals
);
4707 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4708 if ((specbits
& (1 << (int) RID_SIGNED
))
4709 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4710 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4714 /* Detect the case of an array type of unspecified size
4715 which came, as such, direct from a typedef name.
4716 We must copy the type, so that each identifier gets
4717 a distinct type, so that each identifier's size can be
4718 controlled separately by its own initializer. */
4720 if (type
!= 0 && typedef_type
!= 0
4721 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4722 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4724 type
= build_array_type (TREE_TYPE (type
), 0);
4726 C_TYPE_VARIABLE_SIZE (type
) = 1;
4729 /* If this is a type name (such as, in a cast or sizeof),
4730 compute the type and return it now. */
4732 if (decl_context
== TYPENAME
)
4734 /* Note that the grammar rejects storage classes
4735 in typenames, fields or parameters */
4736 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4738 pedwarn ("ISO C forbids const or volatile function types");
4740 type
= c_build_qualified_type (type
, type_quals
);
4744 /* Aside from typedefs and type names (handle above),
4745 `void' at top level (not within pointer)
4746 is allowed only in public variables.
4747 We don't complain about parms either, but that is because
4748 a better error message can be made later. */
4750 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4751 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4752 && ((specbits
& (1 << (int) RID_EXTERN
))
4753 || (current_binding_level
== global_binding_level
4755 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4757 error ("variable or field `%s' declared void", name
);
4758 type
= integer_type_node
;
4761 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4762 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4767 if (decl_context
== PARM
)
4769 tree type_as_written
= type
;
4772 /* A parameter declared as an array of T is really a pointer to T.
4773 One declared as a function is really a pointer to a function. */
4775 if (TREE_CODE (type
) == ARRAY_TYPE
)
4777 /* Transfer const-ness of array into that of type pointed to. */
4778 type
= TREE_TYPE (type
);
4780 type
= c_build_qualified_type (type
, type_quals
);
4781 type
= build_pointer_type (type
);
4782 type_quals
= TYPE_UNQUALIFIED
;
4785 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4787 if (pedantic
&& type_quals
)
4788 pedwarn ("ISO C forbids qualified function types");
4790 type
= c_build_qualified_type (type
, type_quals
);
4791 type
= build_pointer_type (type
);
4792 type_quals
= TYPE_UNQUALIFIED
;
4795 decl
= build_decl (PARM_DECL
, declarator
, type
);
4797 C_DECL_VARIABLE_SIZE (decl
) = 1;
4799 /* Compute the type actually passed in the parmlist,
4800 for the case where there is no prototype.
4801 (For example, shorts and chars are passed as ints.)
4802 When there is a prototype, this is overridden later. */
4804 if (type
== error_mark_node
)
4805 promoted_type
= type
;
4808 promoted_type
= simple_type_promotes_to (type
);
4809 if (! promoted_type
)
4810 promoted_type
= type
;
4813 DECL_ARG_TYPE (decl
) = promoted_type
;
4814 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4816 else if (decl_context
== FIELD
)
4818 /* Structure field. It may not be a function. */
4820 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4822 error ("field `%s' declared as a function", name
);
4823 type
= build_pointer_type (type
);
4825 else if (TREE_CODE (type
) != ERROR_MARK
4826 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4828 error ("field `%s' has incomplete type", name
);
4829 type
= error_mark_node
;
4831 /* Move type qualifiers down to element of an array. */
4832 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4834 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4836 TYPE_DOMAIN (type
));
4838 /* Leave the field const or volatile as well. */
4839 type_quals
= TYPE_UNQUALIFIED
;
4842 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4843 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4846 C_DECL_VARIABLE_SIZE (decl
) = 1;
4848 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4850 /* Every function declaration is "external"
4851 except for those which are inside a function body
4852 in which `auto' is used.
4853 That is a case not specified by ANSI C,
4854 and we use it for forward declarations for nested functions. */
4855 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4856 || current_binding_level
== global_binding_level
);
4858 if (specbits
& (1 << (int) RID_AUTO
)
4859 && (pedantic
|| current_binding_level
== global_binding_level
))
4860 pedwarn ("invalid storage class for function `%s'", name
);
4861 if (specbits
& (1 << (int) RID_REGISTER
))
4862 error ("invalid storage class for function `%s'", name
);
4863 /* Function declaration not at top level.
4864 Storage classes other than `extern' are not allowed
4865 and `extern' makes no difference. */
4866 if (current_binding_level
!= global_binding_level
4867 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4869 pedwarn ("invalid storage class for function `%s'", name
);
4871 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4872 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4874 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4875 pedwarn ("ISO C forbids qualified function types");
4877 /* GNU C interprets a `volatile void' return type to indicate
4878 that the function does not return. */
4879 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4880 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4881 warning ("`noreturn' function returns non-void value");
4884 DECL_EXTERNAL (decl
) = 1;
4885 /* Record absence of global scope for `static' or `auto'. */
4887 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4889 /* Record presence of `inline', if it is reasonable. */
4892 if (MAIN_NAME_P (declarator
))
4893 warning ("cannot inline function `main'");
4895 /* Assume that otherwise the function can be inlined. */
4896 DECL_INLINE (decl
) = 1;
4898 if (specbits
& (1 << (int) RID_EXTERN
))
4899 current_extern_inline
= 1;
4904 /* It's a variable. */
4905 /* An uninitialized decl with `extern' is a reference. */
4906 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4908 /* Move type qualifiers down to element of an array. */
4909 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4911 int saved_align
= TYPE_ALIGN(type
);
4912 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4914 TYPE_DOMAIN (type
));
4915 TYPE_ALIGN (type
) = saved_align
;
4916 #if 0 /* Leave the variable const or volatile as well. */
4917 type_quals
= TYPE_UNQUALIFIED
;
4921 decl
= build_decl (VAR_DECL
, declarator
, type
);
4923 C_DECL_VARIABLE_SIZE (decl
) = 1;
4926 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4928 DECL_EXTERNAL (decl
) = extern_ref
;
4929 /* At top level, the presence of a `static' or `register' storage
4930 class specifier, or the absence of all storage class specifiers
4931 makes this declaration a definition (perhaps tentative). Also,
4932 the absence of both `static' and `register' makes it public. */
4933 if (current_binding_level
== global_binding_level
)
4937 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4938 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4940 /* Not at top level, only `static' makes a static definition. */
4943 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4944 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4948 /* Record `register' declaration for warnings on &
4949 and in case doing stupid register allocation. */
4951 if (specbits
& (1 << (int) RID_REGISTER
))
4952 DECL_REGISTER (decl
) = 1;
4954 /* Record constancy and volatility. */
4955 c_apply_type_quals_to_decl (type_quals
, decl
);
4957 /* If a type has volatile components, it should be stored in memory.
4958 Otherwise, the fact that those components are volatile
4959 will be ignored, and would even crash the compiler. */
4960 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4961 mark_addressable (decl
);
4967 /* Decode the parameter-list info for a function type or function definition.
4968 The argument is the value returned by `get_parm_info' (or made in parse.y
4969 if there is an identifier list instead of a parameter decl list).
4970 These two functions are separate because when a function returns
4971 or receives functions then each is called multiple times but the order
4972 of calls is different. The last call to `grokparms' is always the one
4973 that contains the formal parameter names of a function definition.
4975 Store in `last_function_parms' a chain of the decls of parms.
4976 Also store in `last_function_parm_tags' a chain of the struct, union,
4977 and enum tags declared among the parms.
4979 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4981 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4982 a mere declaration. A nonempty identifier-list gets an error message
4983 when FUNCDEF_FLAG is zero. */
4986 grokparms (parms_info
, funcdef_flag
)
4990 tree first_parm
= TREE_CHAIN (parms_info
);
4992 last_function_parms
= TREE_PURPOSE (parms_info
);
4993 last_function_parm_tags
= TREE_VALUE (parms_info
);
4995 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4996 && !in_system_header
)
4997 warning ("function declaration isn't a prototype");
5000 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5003 pedwarn ("parameter names (without types) in function declaration");
5005 last_function_parms
= first_parm
;
5012 /* We no longer test FUNCDEF_FLAG.
5013 If the arg types are incomplete in a declaration,
5014 they must include undefined tags.
5015 These tags can never be defined in the scope of the declaration,
5016 so the types can never be completed,
5017 and no call can be compiled successfully. */
5019 /* In a fcn definition, arg types must be complete. */
5022 for (parm
= last_function_parms
, typelt
= first_parm
;
5024 parm
= TREE_CHAIN (parm
))
5025 /* Skip over any enumeration constants declared here. */
5026 if (TREE_CODE (parm
) == PARM_DECL
)
5028 /* Barf if the parameter itself has an incomplete type. */
5029 tree type
= TREE_VALUE (typelt
);
5030 if (type
== error_mark_node
)
5032 if (!COMPLETE_TYPE_P (type
))
5034 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5035 error ("parameter `%s' has incomplete type",
5036 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5038 warning ("parameter has incomplete type");
5041 TREE_VALUE (typelt
) = error_mark_node
;
5042 TREE_TYPE (parm
) = error_mark_node
;
5046 /* This has been replaced by parm_tags_warning, which
5047 uses a more accurate criterion for what to warn
5051 /* Now warn if is a pointer to an incomplete type. */
5052 while (TREE_CODE (type
) == POINTER_TYPE
5053 || TREE_CODE (type
) == REFERENCE_TYPE
)
5054 type
= TREE_TYPE (type
);
5055 type
= TYPE_MAIN_VARIANT (type
);
5056 if (!COMPLETE_TYPE_P (type
))
5058 if (DECL_NAME (parm
) != 0)
5059 warning ("parameter `%s' points to incomplete type",
5060 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5062 warning ("parameter points to incomplete type");
5066 typelt
= TREE_CHAIN (typelt
);
5073 /* Return a tree_list node with info on a parameter list just parsed.
5074 The TREE_PURPOSE is a chain of decls of those parms.
5075 The TREE_VALUE is a list of structure, union and enum tags defined.
5076 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5077 This tree_list node is later fed to `grokparms'.
5079 VOID_AT_END nonzero means append `void' to the end of the type-list.
5080 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5083 get_parm_info (void_at_end
)
5086 register tree decl
, t
;
5087 register tree types
= 0;
5089 tree tags
= gettags ();
5090 tree parms
= getdecls ();
5092 tree order
= current_binding_level
->parm_order
;
5094 /* Just `void' (and no ellipsis) is special. There are really no parms.
5095 But if the `void' is qualified (by `const' or `volatile') or has a
5096 storage class specifier (`register'), then the behavior is undefined;
5097 by not counting it as the special case of `void' we will cause an
5098 error later. Typedefs for `void' are OK (see DR#157). */
5099 if (void_at_end
&& parms
!= 0
5100 && TREE_CHAIN (parms
) == 0
5101 && VOID_TYPE_P (TREE_TYPE (parms
))
5102 && ! TREE_THIS_VOLATILE (parms
)
5103 && ! TREE_READONLY (parms
)
5104 && ! DECL_REGISTER (parms
)
5105 && DECL_NAME (parms
) == 0)
5108 storedecls (NULL_TREE
);
5109 return tree_cons (NULL_TREE
, NULL_TREE
,
5110 tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5113 /* Extract enumerator values and other non-parms declared with the parms.
5114 Likewise any forward parm decls that didn't have real parm decls. */
5115 for (decl
= parms
; decl
;)
5117 tree next
= TREE_CHAIN (decl
);
5119 if (TREE_CODE (decl
) != PARM_DECL
)
5121 TREE_CHAIN (decl
) = new_parms
;
5124 else if (TREE_ASM_WRITTEN (decl
))
5126 error_with_decl (decl
,
5127 "parameter `%s' has just a forward declaration");
5128 TREE_CHAIN (decl
) = new_parms
;
5134 /* Put the parm decls back in the order they were in in the parm list. */
5135 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5138 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5140 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5143 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5146 /* Store the parmlist in the binding level since the old one
5147 is no longer a valid list. (We have changed the chain pointers.) */
5148 storedecls (new_parms
);
5150 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5151 /* There may also be declarations for enumerators if an enumeration
5152 type is declared among the parms. Ignore them here. */
5153 if (TREE_CODE (decl
) == PARM_DECL
)
5155 /* Since there is a prototype,
5156 args are passed in their declared types. */
5157 tree type
= TREE_TYPE (decl
);
5158 DECL_ARG_TYPE (decl
) = type
;
5159 if (PROMOTE_PROTOTYPES
5160 && (TREE_CODE (type
) == INTEGER_TYPE
5161 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5162 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5163 DECL_ARG_TYPE (decl
) = integer_type_node
;
5165 types
= tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5166 if (VOID_TYPE_P (TREE_VALUE (types
)) && ! erred
5167 && DECL_NAME (decl
) == 0)
5169 error ("`void' in parameter list must be the entire list");
5175 return tree_cons (new_parms
, tags
,
5176 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
5178 return tree_cons (new_parms
, tags
, nreverse (types
));
5181 /* At end of parameter list, warn about any struct, union or enum tags
5182 defined within. Do so because these types cannot ever become complete. */
5185 parmlist_tags_warning ()
5190 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5192 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5193 /* An anonymous union parm type is meaningful as a GNU extension.
5194 So don't warn for that. */
5195 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5197 if (TREE_PURPOSE (elt
) != 0)
5198 warning ("`%s %s' declared inside parameter list",
5199 (code
== RECORD_TYPE
? "struct"
5200 : code
== UNION_TYPE
? "union"
5202 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5205 /* For translation these need to be seperate warnings */
5206 if (code
== RECORD_TYPE
)
5207 warning ("anonymous struct declared inside parameter list");
5208 else if (code
== UNION_TYPE
)
5209 warning ("anonymous union declared inside parameter list");
5211 warning ("anonymous enum declared inside parameter list");
5215 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5221 /* Get the struct, enum or union (CODE says which) with tag NAME.
5222 Define the tag as a forward-reference if it is not defined. */
5225 xref_tag (code
, name
)
5226 enum tree_code code
;
5229 /* If a cross reference is requested, look up the type
5230 already defined for this tag and return it. */
5232 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5233 /* Even if this is the wrong type of tag, return what we found.
5234 There will be an error message anyway, from pending_xref_error.
5235 If we create an empty xref just for an invalid use of the type,
5236 the main result is to create lots of superfluous error messages. */
5240 /* If no such tag is yet defined, create a forward-reference node
5241 and record it as the "definition".
5242 When a real declaration of this type is found,
5243 the forward-reference will be altered into a real type. */
5245 ref
= make_node (code
);
5246 if (code
== ENUMERAL_TYPE
)
5248 /* (In ANSI, Enums can be referred to only if already defined.) */
5250 pedwarn ("ISO C forbids forward references to `enum' types");
5251 /* Give the type a default layout like unsigned int
5252 to avoid crashing if it does not get defined. */
5253 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5254 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5255 TYPE_USER_ALIGN (ref
) = 0;
5256 TREE_UNSIGNED (ref
) = 1;
5257 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5258 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5259 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5262 pushtag (name
, ref
);
5267 /* Make sure that the tag NAME is defined *in the current binding level*
5268 at least as a forward reference.
5269 CODE says which kind of tag NAME ought to be. */
5272 start_struct (code
, name
)
5273 enum tree_code code
;
5276 /* If there is already a tag defined at this binding level
5277 (as a forward reference), just return it. */
5279 register tree ref
= 0;
5282 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5283 if (ref
&& TREE_CODE (ref
) == code
)
5285 C_TYPE_BEING_DEFINED (ref
) = 1;
5286 TYPE_PACKED (ref
) = flag_pack_struct
;
5287 if (TYPE_FIELDS (ref
))
5288 error ("redefinition of `%s %s'",
5289 code
== UNION_TYPE
? "union" : "struct",
5290 IDENTIFIER_POINTER (name
));
5295 /* Otherwise create a forward-reference just so the tag is in scope. */
5297 ref
= make_node (code
);
5298 pushtag (name
, ref
);
5299 C_TYPE_BEING_DEFINED (ref
) = 1;
5300 TYPE_PACKED (ref
) = flag_pack_struct
;
5304 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5305 of a structure component, returning a FIELD_DECL node.
5306 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5308 This is done during the parsing of the struct declaration.
5309 The FIELD_DECL nodes are chained together and the lot of them
5310 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5313 grokfield (filename
, line
, declarator
, declspecs
, width
)
5314 const char *filename ATTRIBUTE_UNUSED
;
5315 int line ATTRIBUTE_UNUSED
;
5316 tree declarator
, declspecs
, width
;
5320 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5322 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5323 DECL_INITIAL (value
) = width
;
5325 maybe_objc_check_decl (value
);
5329 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5330 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5331 ATTRIBUTES are attributes to be applied to the structure. */
5334 finish_struct (t
, fieldlist
, attributes
)
5340 int toplevel
= global_binding_level
== current_binding_level
;
5342 /* If this type was previously laid out as a forward reference,
5343 make sure we lay it out again. */
5347 decl_attributes (t
, attributes
, NULL_TREE
);
5349 /* Nameless union parm types are useful as GCC extension. */
5350 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5351 /* Otherwise, warn about any struct or union def. in parmlist. */
5352 if (in_parm_level_p ())
5355 pedwarn ("%s defined inside parms",
5356 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
5357 else if (! flag_traditional
)
5358 warning ("%s defined inside parms",
5359 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
5364 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5365 if (DECL_NAME (x
) != 0)
5369 pedwarn ("%s has no %s",
5370 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
5371 fieldlist
? _("named members") : _("members"));
5374 /* Install struct as DECL_CONTEXT of each field decl.
5375 Also process specified field sizes,m which is found in the DECL_INITIAL.
5376 Store 0 there, except for ": 0" fields (so we can find them
5377 and delete them, below). */
5379 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5381 DECL_CONTEXT (x
) = t
;
5382 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5384 /* If any field is const, the structure type is pseudo-const. */
5385 if (TREE_READONLY (x
))
5386 C_TYPE_FIELDS_READONLY (t
) = 1;
5389 /* A field that is pseudo-const makes the structure likewise. */
5390 tree t1
= TREE_TYPE (x
);
5391 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5392 t1
= TREE_TYPE (t1
);
5393 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5394 && C_TYPE_FIELDS_READONLY (t1
))
5395 C_TYPE_FIELDS_READONLY (t
) = 1;
5398 /* Any field that is volatile means variables of this type must be
5399 treated in some ways as volatile. */
5400 if (TREE_THIS_VOLATILE (x
))
5401 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5403 /* Any field of nominal variable size implies structure is too. */
5404 if (C_DECL_VARIABLE_SIZE (x
))
5405 C_TYPE_VARIABLE_SIZE (t
) = 1;
5407 /* Detect invalid nested redefinition. */
5408 if (TREE_TYPE (x
) == t
)
5409 error ("nested redefinition of `%s'",
5410 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5412 /* Detect invalid bit-field size. */
5413 if (DECL_INITIAL (x
))
5414 STRIP_NOPS (DECL_INITIAL (x
));
5415 if (DECL_INITIAL (x
))
5417 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5418 constant_expression_warning (DECL_INITIAL (x
));
5422 "bit-field `%s' width not an integer constant");
5423 DECL_INITIAL (x
) = NULL
;
5427 /* Detect invalid bit-field type. */
5428 if (DECL_INITIAL (x
)
5429 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5430 && TREE_CODE (TREE_TYPE (x
)) != BOOLEAN_TYPE
5431 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5433 error_with_decl (x
, "bit-field `%s' has invalid type");
5434 DECL_INITIAL (x
) = NULL
;
5437 if (DECL_INITIAL (x
) && pedantic
5438 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5439 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5440 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != c_bool_type_node
5441 /* Accept an enum that's equivalent to int or unsigned int. */
5442 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5443 && (TYPE_PRECISION (TREE_TYPE (x
))
5444 == TYPE_PRECISION (integer_type_node
))))
5445 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ISO C");
5447 /* Detect and ignore out of range field width and process valid
5449 if (DECL_INITIAL (x
))
5452 if (TYPE_MAIN_VARIANT (TREE_TYPE (x
)) == c_bool_type_node
)
5453 max_width
= CHAR_TYPE_SIZE
;
5455 max_width
= TYPE_PRECISION (TREE_TYPE (x
));
5456 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5457 error_with_decl (x
, "negative width in bit-field `%s'");
5458 else if (0 < compare_tree_int (DECL_INITIAL (x
), max_width
))
5459 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5460 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5461 error_with_decl (x
, "zero width for bit-field `%s'");
5464 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5465 unsigned HOST_WIDE_INT width
5466 = TREE_INT_CST_LOW (DECL_INITIAL (x
));
5468 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5469 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5470 TREE_UNSIGNED (TREE_TYPE (x
)))
5472 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5473 TREE_UNSIGNED (TREE_TYPE (x
))))))
5474 warning_with_decl (x
,
5475 "`%s' is narrower than values of its type");
5477 DECL_SIZE (x
) = bitsize_int (width
);
5478 DECL_BIT_FIELD (x
) = 1;
5479 SET_DECL_C_BIT_FIELD (x
);
5483 /* field size 0 => force desired amount of alignment. */
5484 #ifdef EMPTY_FIELD_BOUNDARY
5485 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5487 #ifdef PCC_BITFIELD_TYPE_MATTERS
5488 if (PCC_BITFIELD_TYPE_MATTERS
)
5490 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5491 TYPE_ALIGN (TREE_TYPE (x
)));
5492 DECL_USER_ALIGN (x
) |= TYPE_USER_ALIGN (TREE_TYPE (x
));
5499 else if (TREE_TYPE (x
) != error_mark_node
)
5501 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5502 : TYPE_ALIGN (TREE_TYPE (x
)));
5504 /* Non-bit-fields are aligned for their type, except packed
5505 fields which require only BITS_PER_UNIT alignment. */
5506 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5507 if (! DECL_PACKED (x
))
5508 DECL_USER_ALIGN (x
) |= TYPE_USER_ALIGN (TREE_TYPE (x
));
5511 DECL_INITIAL (x
) = 0;
5514 /* Delete all duplicate fields from the fieldlist */
5515 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5516 /* Anonymous fields aren't duplicates. */
5517 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5521 register tree y
= fieldlist
;
5525 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5531 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5533 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5534 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5540 /* Now we have the nearly final fieldlist. Record it,
5541 then lay out the structure or union (including the fields). */
5543 TYPE_FIELDS (t
) = fieldlist
;
5547 /* Delete all zero-width bit-fields from the fieldlist */
5549 tree
*fieldlistp
= &fieldlist
;
5551 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5552 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5554 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5557 /* Now we have the truly final field list.
5558 Store it in this type and in the variants. */
5560 TYPE_FIELDS (t
) = fieldlist
;
5562 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5564 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5565 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5566 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5567 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5570 /* If this was supposed to be a transparent union, but we can't
5571 make it one, warn and turn off the flag. */
5572 if (TREE_CODE (t
) == UNION_TYPE
5573 && TYPE_TRANSPARENT_UNION (t
)
5574 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5576 TYPE_TRANSPARENT_UNION (t
) = 0;
5577 warning ("union cannot be made transparent");
5580 /* If this structure or union completes the type of any previous
5581 variable declaration, lay it out and output its rtl. */
5583 if (current_binding_level
->n_incomplete
!= 0)
5586 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5588 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl
)) == TYPE_MAIN_VARIANT (t
)
5589 && TREE_CODE (decl
) != TYPE_DECL
)
5591 layout_decl (decl
, 0);
5592 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5593 maybe_objc_check_decl (decl
);
5594 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5597 --current_binding_level
->n_incomplete
;
5599 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5600 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5602 tree element
= TREE_TYPE (decl
);
5603 while (TREE_CODE (element
) == ARRAY_TYPE
)
5604 element
= TREE_TYPE (element
);
5606 layout_array_type (TREE_TYPE (decl
));
5611 /* Finish debugging output for this type. */
5612 rest_of_type_compilation (t
, toplevel
);
5617 /* Lay out the type T, and its element type, and so on. */
5620 layout_array_type (t
)
5623 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5624 layout_array_type (TREE_TYPE (t
));
5628 /* Begin compiling the definition of an enumeration type.
5629 NAME is its name (or null if anonymous).
5630 Returns the type object, as yet incomplete.
5631 Also records info about it so that build_enumerator
5632 may be used to declare the individual values as they are read. */
5638 register tree enumtype
= 0;
5640 /* If this is the real definition for a previous forward reference,
5641 fill in the contents in the same object that used to be the
5642 forward reference. */
5645 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5647 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5649 enumtype
= make_node (ENUMERAL_TYPE
);
5650 pushtag (name
, enumtype
);
5653 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5655 if (TYPE_VALUES (enumtype
) != 0)
5657 /* This enum is a named one that has been declared already. */
5658 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5660 /* Completely replace its old definition.
5661 The old enumerators remain defined, however. */
5662 TYPE_VALUES (enumtype
) = 0;
5665 enum_next_value
= integer_zero_node
;
5668 if (flag_short_enums
)
5669 TYPE_PACKED (enumtype
) = 1;
5674 /* After processing and defining all the values of an enumeration type,
5675 install their decls in the enumeration type and finish it off.
5676 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5677 and ATTRIBUTES are the specified attributes.
5678 Returns ENUMTYPE. */
5681 finish_enum (enumtype
, values
, attributes
)
5686 register tree pair
, tem
;
5687 tree minnode
= 0, maxnode
= 0, enum_value_type
;
5688 int precision
, unsign
;
5689 int toplevel
= (global_binding_level
== current_binding_level
);
5691 if (in_parm_level_p ())
5692 warning ("enum defined inside parms");
5694 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5696 /* Calculate the maximum value of any enumerator in this type. */
5698 if (values
== error_mark_node
)
5699 minnode
= maxnode
= integer_zero_node
;
5702 minnode
= maxnode
= TREE_VALUE (values
);
5703 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5705 tree value
= TREE_VALUE (pair
);
5706 if (tree_int_cst_lt (maxnode
, value
))
5708 if (tree_int_cst_lt (value
, minnode
))
5713 /* Construct the final type of this enumeration. It is the same
5714 as one of the integral types - the narrowest one that fits, except
5715 that normally we only go as narrow as int - and signed iff any of
5716 the values are negative. */
5717 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5718 precision
= MAX (min_precision (minnode
, unsign
),
5719 min_precision (maxnode
, unsign
));
5720 if (!TYPE_PACKED (enumtype
))
5721 precision
= MAX (precision
, TYPE_PRECISION (integer_type_node
));
5722 if (type_for_size (precision
, unsign
) == 0)
5724 warning ("enumeration values exceed range of largest integer");
5725 precision
= TYPE_PRECISION (long_long_integer_type_node
);
5728 if (precision
== TYPE_PRECISION (integer_type_node
))
5729 enum_value_type
= type_for_size (precision
, 0);
5731 enum_value_type
= enumtype
;
5733 TYPE_MIN_VALUE (enumtype
) = minnode
;
5734 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5735 TYPE_PRECISION (enumtype
) = precision
;
5736 TREE_UNSIGNED (enumtype
) = unsign
;
5737 TYPE_SIZE (enumtype
) = 0;
5738 layout_type (enumtype
);
5740 if (values
!= error_mark_node
)
5742 /* Change the type of the enumerators to be the enum type. We
5743 need to do this irrespective of the size of the enum, for
5744 proper type checking. Replace the DECL_INITIALs of the
5745 enumerators, and the value slots of the list, with copies
5746 that have the enum type; they cannot be modified in place
5747 because they may be shared (e.g. integer_zero_node) Finally,
5748 change the purpose slots to point to the names of the decls. */
5749 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5751 tree enu
= TREE_PURPOSE (pair
);
5753 TREE_TYPE (enu
) = enumtype
;
5754 DECL_SIZE (enu
) = TYPE_SIZE (enumtype
);
5755 DECL_SIZE_UNIT (enu
) = TYPE_SIZE_UNIT (enumtype
);
5756 DECL_ALIGN (enu
) = TYPE_ALIGN (enumtype
);
5757 DECL_USER_ALIGN (enu
) = TYPE_USER_ALIGN (enumtype
);
5758 DECL_MODE (enu
) = TYPE_MODE (enumtype
);
5760 /* The ISO C Standard mandates enumerators to have type int,
5761 even though the underlying type of an enum type is
5762 unspecified. Here we convert any enumerators that fit in
5763 an int to type int, to avoid promotions to unsigned types
5764 when comparing integers with enumerators that fit in the
5765 int range. When -pedantic is given, build_enumerator()
5766 would have already taken care of those that don't fit. */
5767 if (int_fits_type_p (DECL_INITIAL (enu
), enum_value_type
))
5768 DECL_INITIAL (enu
) = convert (enum_value_type
, DECL_INITIAL (enu
));
5770 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5772 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5773 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5776 TYPE_VALUES (enumtype
) = values
;
5779 /* Fix up all variant types of this enum type. */
5780 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5782 if (tem
== enumtype
)
5784 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5785 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5786 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5787 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5788 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5789 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5790 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5791 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5792 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5793 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5796 /* Finish debugging output for this type. */
5797 rest_of_type_compilation (enumtype
, toplevel
);
5802 /* Build and install a CONST_DECL for one value of the
5803 current enumeration type (one that was begun with start_enum).
5804 Return a tree-list containing the CONST_DECL and its value.
5805 Assignment of sequential values by default is handled here. */
5808 build_enumerator (name
, value
)
5811 register tree decl
, type
;
5813 /* Validate and default VALUE. */
5815 /* Remove no-op casts from the value. */
5817 STRIP_TYPE_NOPS (value
);
5821 if (TREE_CODE (value
) == INTEGER_CST
)
5823 value
= default_conversion (value
);
5824 constant_expression_warning (value
);
5828 error ("enumerator value for `%s' not integer constant",
5829 IDENTIFIER_POINTER (name
));
5834 /* Default based on previous value. */
5835 /* It should no longer be possible to have NON_LVALUE_EXPR
5839 value
= enum_next_value
;
5841 error ("overflow in enumeration values");
5844 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5846 pedwarn ("ISO C restricts enumerator values to range of `int'");
5847 value
= convert (integer_type_node
, value
);
5850 /* Set basis for default for next value. */
5851 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5852 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5854 /* Now create a declaration for the enum value name. */
5856 type
= TREE_TYPE (value
);
5857 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5858 TYPE_PRECISION (integer_type_node
)),
5860 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5861 && TREE_UNSIGNED (type
)));
5863 decl
= build_decl (CONST_DECL
, name
, type
);
5864 DECL_INITIAL (decl
) = convert (type
, value
);
5867 return tree_cons (decl
, value
, NULL_TREE
);
5871 /* Create the FUNCTION_DECL for a function definition.
5872 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5873 the declaration; they describe the function's name and the type it returns,
5874 but twisted together in a fashion that parallels the syntax of C.
5876 This function creates a binding context for the function body
5877 as well as setting up the FUNCTION_DECL in current_function_decl.
5879 Returns 1 on success. If the DECLARATOR is not suitable for a function
5880 (it defines a datum instead), we return 0, which tells
5881 yyparse to report a parse error. */
5884 start_function (declspecs
, declarator
, prefix_attributes
, attributes
)
5885 tree declarator
, declspecs
, prefix_attributes
, attributes
;
5887 tree decl1
, old_decl
;
5889 int old_immediate_size_expand
= immediate_size_expand
;
5891 current_function_returns_value
= 0; /* Assume, until we see it does. */
5892 current_function_returns_null
= 0;
5893 warn_about_return_type
= 0;
5894 current_extern_inline
= 0;
5895 c_function_varargs
= 0;
5897 shadowed_labels
= 0;
5899 /* Don't expand any sizes in the return type of the function. */
5900 immediate_size_expand
= 0;
5902 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5904 /* If the declarator is not suitable for a function definition,
5905 cause a syntax error. */
5908 immediate_size_expand
= old_immediate_size_expand
;
5912 decl_attributes (decl1
, prefix_attributes
, attributes
);
5914 announce_function (decl1
);
5916 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5918 error ("return type is an incomplete type");
5919 /* Make it return void instead. */
5921 = build_function_type (void_type_node
,
5922 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5925 if (warn_about_return_type
)
5926 pedwarn_c99 ("return type defaults to `int'");
5928 /* Save the parm names or decls from this function's declarator
5929 where store_parm_decls will find them. */
5930 current_function_parms
= last_function_parms
;
5931 current_function_parm_tags
= last_function_parm_tags
;
5933 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5934 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5935 DECL_INITIAL (decl1
) = error_mark_node
;
5937 /* If this definition isn't a prototype and we had a prototype declaration
5938 before, copy the arg type info from that prototype.
5939 But not if what we had before was a builtin function. */
5940 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5941 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5942 && !DECL_BUILT_IN (old_decl
)
5943 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5944 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5945 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5947 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5948 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
5949 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
5952 /* If there is no explicit declaration, look for any out-of-scope implicit
5955 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
5957 /* Optionally warn of old-fashioned def with no previous prototype. */
5958 if (warn_strict_prototypes
5959 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5960 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5961 warning ("function declaration isn't a prototype");
5962 /* Optionally warn of any global def with no previous prototype. */
5963 else if (warn_missing_prototypes
5964 && TREE_PUBLIC (decl1
)
5965 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
5966 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
5967 warning_with_decl (decl1
, "no previous prototype for `%s'");
5968 /* Optionally warn of any def with no previous prototype
5969 if the function has already been used. */
5970 else if (warn_missing_prototypes
5971 && old_decl
!= 0 && TREE_USED (old_decl
)
5972 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5973 warning_with_decl (decl1
,
5974 "`%s' was used with no prototype before its definition");
5975 /* Optionally warn of any global def with no previous declaration. */
5976 else if (warn_missing_declarations
5977 && TREE_PUBLIC (decl1
)
5979 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
5980 warning_with_decl (decl1
, "no previous declaration for `%s'");
5981 /* Optionally warn of any def with no previous declaration
5982 if the function has already been used. */
5983 else if (warn_missing_declarations
5984 && old_decl
!= 0 && TREE_USED (old_decl
)
5985 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
5986 warning_with_decl (decl1
,
5987 "`%s' was used with no declaration before its definition");
5989 /* This is a definition, not a reference.
5990 So normally clear DECL_EXTERNAL.
5991 However, `extern inline' acts like a declaration
5992 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5993 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5995 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5996 SET_DEFAULT_DECL_ATTRIBUTES (decl1
, attributes
);
5999 /* This function exists in static storage.
6000 (This does not mean `static' in the C sense!) */
6001 TREE_STATIC (decl1
) = 1;
6003 /* A nested function is not global. */
6004 if (current_function_decl
!= 0)
6005 TREE_PUBLIC (decl1
) = 0;
6007 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6008 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
6013 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6014 != integer_type_node
)
6015 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
6017 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6018 args
= TREE_CHAIN (args
))
6020 tree type
= args
? TREE_VALUE (args
) : 0;
6022 if (type
== void_type_node
)
6029 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6030 pedwarn_with_decl (decl1
,
6031 "first argument of `%s' should be `int'");
6035 if (TREE_CODE (type
) != POINTER_TYPE
6036 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6037 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6039 pedwarn_with_decl (decl1
,
6040 "second argument of `%s' should be `char **'");
6044 if (TREE_CODE (type
) != POINTER_TYPE
6045 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6046 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6048 pedwarn_with_decl (decl1
,
6049 "third argument of `%s' should probably be `char **'");
6054 /* It is intentional that this message does not mention the third
6055 argument because it's only mentioned in an appendix of the
6057 if (argct
> 0 && (argct
< 2 || argct
> 3))
6058 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
6060 if (! TREE_PUBLIC (decl1
))
6061 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
6064 /* Record the decl so that the function name is defined.
6065 If we already have a decl for this name, and it is a FUNCTION_DECL,
6066 use the old decl. */
6068 current_function_decl
= pushdecl (decl1
);
6071 declare_parm_level (1);
6072 current_binding_level
->subblocks_tag_transparent
= 1;
6074 make_function_rtl (current_function_decl
);
6076 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6077 /* Promote the value to int before returning it. */
6078 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6080 /* It retains unsignedness if traditional
6081 or if not really getting wider. */
6082 if (TREE_UNSIGNED (restype
)
6083 && (flag_traditional
6084 || (TYPE_PRECISION (restype
)
6085 == TYPE_PRECISION (integer_type_node
))))
6086 restype
= unsigned_type_node
;
6088 restype
= integer_type_node
;
6090 DECL_RESULT (current_function_decl
)
6091 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6093 /* If this fcn was already referenced via a block-scope `extern' decl
6094 (or an implicit decl), propagate certain information about the usage. */
6095 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6096 TREE_ADDRESSABLE (current_function_decl
) = 1;
6098 immediate_size_expand
= old_immediate_size_expand
;
6103 /* Record that this function is going to be a varargs function.
6104 This is called before store_parm_decls, which is too early
6105 to call mark_varargs directly. */
6110 c_function_varargs
= 1;
6113 /* Store the parameter declarations into the current function declaration.
6114 This is called after parsing the parameter declarations, before
6115 digesting the body of the function.
6117 For an old-style definition, modify the function's type
6118 to specify at least the number of arguments. */
6123 register tree fndecl
= current_function_decl
;
6126 /* This is either a chain of PARM_DECLs (if a prototype was used)
6127 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6128 tree specparms
= current_function_parms
;
6130 /* This is a list of types declared among parms in a prototype. */
6131 tree parmtags
= current_function_parm_tags
;
6133 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6134 register tree parmdecls
= getdecls ();
6136 /* This is a chain of any other decls that came in among the parm
6137 declarations. If a parm is declared with enum {foo, bar} x;
6138 then CONST_DECLs for foo and bar are put here. */
6141 /* Nonzero if this definition is written with a prototype. */
6144 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6146 /* This case is when the function was defined with an ANSI prototype.
6147 The parms already have decls, so we need not do anything here
6148 except record them as in effect
6149 and complain if any redundant old-style parm decls were written. */
6160 error_with_decl (fndecl
,
6161 "parm types given both in parmlist and separately");
6162 /* Get rid of the erroneous decls; don't keep them on
6163 the list of parms, since they might not be PARM_DECLs. */
6164 for (decl
= current_binding_level
->names
;
6165 decl
; decl
= TREE_CHAIN (decl
))
6166 if (DECL_NAME (decl
))
6167 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6168 for (link
= current_binding_level
->shadowed
;
6169 link
; link
= TREE_CHAIN (link
))
6170 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6171 current_binding_level
->names
= 0;
6172 current_binding_level
->shadowed
= 0;
6175 specparms
= nreverse (specparms
);
6176 for (parm
= specparms
; parm
; parm
= next
)
6178 next
= TREE_CHAIN (parm
);
6179 if (TREE_CODE (parm
) == PARM_DECL
)
6181 if (DECL_NAME (parm
) == 0)
6182 error_with_decl (parm
, "parameter name omitted");
6183 else if (TREE_CODE (TREE_TYPE (parm
)) != ERROR_MARK
6184 && VOID_TYPE_P (TREE_TYPE (parm
)))
6186 error_with_decl (parm
, "parameter `%s' declared void");
6187 /* Change the type to error_mark_node so this parameter
6188 will be ignored by assign_parms. */
6189 TREE_TYPE (parm
) = error_mark_node
;
6195 /* If we find an enum constant or a type tag,
6196 put it aside for the moment. */
6197 TREE_CHAIN (parm
) = 0;
6198 others
= chainon (others
, parm
);
6202 /* Get the decls in their original chain order
6203 and record in the function. */
6204 DECL_ARGUMENTS (fndecl
) = getdecls ();
6207 /* If this function takes a variable number of arguments,
6208 add a phony parameter to the end of the parm list,
6209 to represent the position of the first unnamed argument. */
6210 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6213 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6214 /* Let's hope the address of the unnamed parm
6215 won't depend on its type. */
6216 TREE_TYPE (dummy
) = integer_type_node
;
6217 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6218 DECL_ARGUMENTS (fndecl
) = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6222 /* Now pushdecl the enum constants. */
6223 for (parm
= others
; parm
; parm
= next
)
6225 next
= TREE_CHAIN (parm
);
6226 if (DECL_NAME (parm
) == 0)
6228 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6230 else if (TREE_CODE (parm
) != PARM_DECL
)
6234 storetags (chainon (parmtags
, gettags ()));
6238 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6239 each with a parm name as the TREE_VALUE.
6241 PARMDECLS is a chain of declarations for parameters.
6242 Warning! It can also contain CONST_DECLs which are not parameters
6243 but are names of enumerators of any enum types
6244 declared among the parameters.
6246 First match each formal parameter name with its declaration.
6247 Associate decls with the names and store the decls
6248 into the TREE_PURPOSE slots. */
6250 /* We use DECL_WEAK as a flag to show which parameters have been
6251 seen already since it is not used on PARM_DECL or CONST_DECL. */
6252 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6253 DECL_WEAK (parm
) = 0;
6255 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6257 register tree tail
, found
= NULL
;
6259 if (TREE_VALUE (parm
) == 0)
6261 error_with_decl (fndecl
,
6262 "parameter name missing from parameter list");
6263 TREE_PURPOSE (parm
) = 0;
6267 /* See if any of the parmdecls specifies this parm by name.
6268 Ignore any enumerator decls. */
6269 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6270 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6271 && TREE_CODE (tail
) == PARM_DECL
)
6277 /* If declaration already marked, we have a duplicate name.
6278 Complain, and don't use this decl twice. */
6279 if (found
&& DECL_WEAK (found
))
6281 error_with_decl (found
, "multiple parameters named `%s'");
6285 /* If the declaration says "void", complain and ignore it. */
6286 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6288 error_with_decl (found
, "parameter `%s' declared void");
6289 TREE_TYPE (found
) = integer_type_node
;
6290 DECL_ARG_TYPE (found
) = integer_type_node
;
6291 layout_decl (found
, 0);
6294 /* Traditionally, a parm declared float is actually a double. */
6295 if (found
&& flag_traditional
6296 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6298 TREE_TYPE (found
) = double_type_node
;
6299 DECL_ARG_TYPE (found
) = double_type_node
;
6300 layout_decl (found
, 0);
6303 /* If no declaration found, default to int. */
6306 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6308 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6309 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6310 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6312 pedwarn_with_decl (found
, "type of `%s' defaults to `int'");
6313 else if (extra_warnings
)
6314 warning_with_decl (found
, "type of `%s' defaults to `int'");
6318 TREE_PURPOSE (parm
) = found
;
6320 /* Mark this decl as "already found". */
6321 DECL_WEAK (found
) = 1;
6324 /* Put anything which is on the parmdecls chain and which is
6325 not a PARM_DECL onto the list NONPARMS. (The types of
6326 non-parm things which might appear on the list include
6327 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6328 any actual PARM_DECLs not matched with any names. */
6331 for (parm
= parmdecls
; parm
;)
6333 tree next
= TREE_CHAIN (parm
);
6334 TREE_CHAIN (parm
) = 0;
6336 if (TREE_CODE (parm
) != PARM_DECL
)
6337 nonparms
= chainon (nonparms
, parm
);
6340 /* Complain about args with incomplete types. */
6341 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6343 error_with_decl (parm
, "parameter `%s' has incomplete type");
6344 TREE_TYPE (parm
) = error_mark_node
;
6347 if (! DECL_WEAK (parm
))
6349 error_with_decl (parm
,
6350 "declaration for parameter `%s' but no such parameter");
6351 /* Pretend the parameter was not missing.
6352 This gets us to a standard state and minimizes
6353 further error messages. */
6355 = chainon (specparms
,
6356 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6363 /* Chain the declarations together in the order of the list of
6364 names. Store that chain in the function decl, replacing the
6367 DECL_ARGUMENTS (fndecl
) = 0;
6370 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6371 if (TREE_PURPOSE (parm
))
6374 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6376 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6377 last
= TREE_PURPOSE (parm
);
6378 TREE_CHAIN (last
) = 0;
6382 /* If there was a previous prototype,
6383 set the DECL_ARG_TYPE of each argument according to
6384 the type previously specified, and report any mismatches. */
6386 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6389 for (parm
= DECL_ARGUMENTS (fndecl
),
6390 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6391 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6392 != void_type_node
));
6393 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6395 if (parm
== 0 || type
== 0
6396 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6398 error ("number of arguments doesn't match prototype");
6399 error_with_file_and_line (current_function_prototype_file
,
6400 current_function_prototype_line
,
6401 "prototype declaration");
6404 /* Type for passing arg must be consistent
6405 with that declared for the arg. */
6406 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6408 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6409 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6411 /* Adjust argument to match prototype. E.g. a previous
6412 `int foo(float);' prototype causes
6413 `int foo(x) float x; {...}' to be treated like
6414 `int foo(float x) {...}'. This is particularly
6415 useful for argument types like uid_t. */
6416 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6418 if (PROMOTE_PROTOTYPES
6419 && (TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6420 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6421 && TYPE_PRECISION (TREE_TYPE (parm
))
6422 < TYPE_PRECISION (integer_type_node
))
6423 DECL_ARG_TYPE (parm
) = integer_type_node
;
6427 pedwarn ("promoted argument `%s' doesn't match prototype",
6428 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6429 warning_with_file_and_line
6430 (current_function_prototype_file
,
6431 current_function_prototype_line
,
6432 "prototype declaration");
6435 /* If -traditional, allow `int' argument to match
6436 `unsigned' prototype. */
6437 else if (! (flag_traditional
6438 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6439 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6441 error ("argument `%s' doesn't match prototype",
6442 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6443 error_with_file_and_line (current_function_prototype_file
,
6444 current_function_prototype_line
,
6445 "prototype declaration");
6449 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6452 /* Otherwise, create a prototype that would match. */
6456 tree actual
= 0, last
= 0, type
;
6458 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6460 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6462 TREE_CHAIN (last
) = type
;
6467 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6469 TREE_CHAIN (last
) = type
;
6473 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6474 of the type of this function, but we need to avoid having this
6475 affect the types of other similarly-typed functions, so we must
6476 first force the generation of an identical (but separate) type
6477 node for the relevant function type. The new node we create
6478 will be a variant of the main variant of the original function
6481 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6483 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6486 /* Now store the final chain of decls for the arguments
6487 as the decl-chain of the current lexical scope.
6488 Put the enumerators in as well, at the front so that
6489 DECL_ARGUMENTS is not modified. */
6491 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6494 /* Make sure the binding level for the top of the function body
6495 gets a BLOCK if there are any in the function.
6496 Otherwise, the dbx output is wrong. */
6498 keep_next_if_subblocks
= 1;
6500 /* ??? This might be an improvement,
6501 but needs to be thought about some more. */
6503 keep_next_level_flag
= 1;
6506 /* Write a record describing this function definition to the prototypes
6507 file (if requested). */
6509 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6511 /* Initialize the RTL code for the function. */
6513 init_function_start (fndecl
, input_filename
, lineno
);
6515 /* Begin the statement tree for this function. */
6516 DECL_LANG_SPECIFIC (current_function_decl
)
6517 =((struct lang_decl
*) ggc_alloc (sizeof (struct lang_decl
)));
6518 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl
));
6520 /* This function is being processed in whole-function mode. */
6521 cfun
->x_whole_function_mode_p
= 1;
6523 /* Even though we're inside a function body, we still don't want to
6524 call expand_expr to calculate the size of a variable-sized array.
6525 We haven't necessarily assigned RTL to all variables yet, so it's
6526 not safe to try to expand expressions involving them. */
6527 immediate_size_expand
= 0;
6528 cfun
->x_dont_save_pending_sizes_p
= 1;
6531 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6532 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6533 stands for an ellipsis in the identifier list.
6535 PARMLIST is the data returned by get_parm_info for the
6536 parmlist that follows the semicolon.
6538 We return a value of the same sort that get_parm_info returns,
6539 except that it describes the combination of identifiers and parmlist. */
6542 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6543 tree specparms
, parmlist
;
6546 register tree fndecl
= current_function_decl
;
6549 tree parmdecls
= TREE_PURPOSE (parmlist
);
6551 /* This is a chain of any other decls that came in among the parm
6552 declarations. They were separated already by get_parm_info,
6553 so we just need to keep them separate. */
6554 tree nonparms
= TREE_VALUE (parmlist
);
6558 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6559 DECL_WEAK (parm
) = 0;
6561 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6563 register tree tail
, found
= NULL
;
6565 /* See if any of the parmdecls specifies this parm by name. */
6566 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6567 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6573 /* If declaration already marked, we have a duplicate name.
6574 Complain, and don't use this decl twice. */
6575 if (found
&& DECL_WEAK (found
))
6577 error_with_decl (found
, "multiple parameters named `%s'");
6581 /* If the declaration says "void", complain and ignore it. */
6582 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6584 error_with_decl (found
, "parameter `%s' declared void");
6585 TREE_TYPE (found
) = integer_type_node
;
6586 DECL_ARG_TYPE (found
) = integer_type_node
;
6587 layout_decl (found
, 0);
6590 /* Traditionally, a parm declared float is actually a double. */
6591 if (found
&& flag_traditional
6592 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6594 TREE_TYPE (found
) = double_type_node
;
6595 DECL_ARG_TYPE (found
) = double_type_node
;
6596 layout_decl (found
, 0);
6599 /* If no declaration found, default to int. */
6602 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6604 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6605 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6606 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6607 error_with_decl (found
, "type of parameter `%s' is not declared");
6611 TREE_PURPOSE (parm
) = found
;
6613 /* Mark this decl as "already found". */
6614 DECL_WEAK (found
) = 1;
6617 /* Complain about any actual PARM_DECLs not matched with any names. */
6619 for (parm
= parmdecls
; parm
;)
6621 tree next
= TREE_CHAIN (parm
);
6622 TREE_CHAIN (parm
) = 0;
6624 /* Complain about args with incomplete types. */
6625 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6627 error_with_decl (parm
, "parameter `%s' has incomplete type");
6628 TREE_TYPE (parm
) = error_mark_node
;
6631 if (! DECL_WEAK (parm
))
6633 error_with_decl (parm
,
6634 "declaration for parameter `%s' but no such parameter");
6635 /* Pretend the parameter was not missing.
6636 This gets us to a standard state and minimizes
6637 further error messages. */
6639 = chainon (specparms
,
6640 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6646 /* Chain the declarations together in the order of the list of names.
6647 At the same time, build up a list of their types, in reverse order. */
6653 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6654 if (TREE_PURPOSE (parm
))
6657 parmdecls
= TREE_PURPOSE (parm
);
6659 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6660 last
= TREE_PURPOSE (parm
);
6661 TREE_CHAIN (last
) = 0;
6663 types
= tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6668 return tree_cons (parmdecls
, nonparms
,
6669 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
6671 return tree_cons (parmdecls
, nonparms
, nreverse (types
));
6674 /* Finish up a function declaration and compile that function
6675 all the way to assembler language output. The free the storage
6676 for the function definition.
6678 This is called after parsing the body of the function definition.
6680 NESTED is nonzero if the function being finished is nested in another. */
6683 finish_function (nested
)
6686 register tree fndecl
= current_function_decl
;
6688 /* TREE_READONLY (fndecl) = 1;
6689 This caused &foo to be of type ptr-to-const-function
6690 which then got a warning when stored in a ptr-to-function variable. */
6693 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6695 /* Must mark the RESULT_DECL as being in this function. */
6697 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6699 /* Obey `register' declarations if `setjmp' is called in this fn. */
6700 if (flag_traditional
&& current_function_calls_setjmp
)
6702 setjmp_protect (DECL_INITIAL (fndecl
));
6703 setjmp_protect_args ();
6706 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6708 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6709 != integer_type_node
)
6711 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6712 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6714 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6718 #ifdef DEFAULT_MAIN_RETURN
6719 /* Make it so that `main' always returns success by default. */
6720 DEFAULT_MAIN_RETURN
;
6723 c_expand_return (integer_zero_node
);
6728 /* Tie off the statement tree for this function. */
6729 finish_stmt_tree (&DECL_SAVED_TREE (fndecl
));
6730 /* Clear out memory we no longer need. */
6731 free_after_parsing (cfun
);
6732 /* Since we never call rest_of_compilation, we never clear
6733 CFUN. Do so explicitly. */
6734 free_after_compilation (cfun
);
6739 /* Generate RTL for the body of this function. */
6740 c_expand_body (fndecl
, nested
);
6741 /* Let the error reporting routines know that we're outside a
6742 function. For a nested function, this value is used in
6743 pop_c_function_context and then reset via pop_function_context. */
6744 current_function_decl
= NULL
;
6745 c_function_name_declared_p
= 0;
6749 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6750 then we are already in the process of generating RTL for another
6754 c_expand_body (fndecl
, nested_p
)
6758 /* There's no reason to do any of the work here if we're only doing
6759 semantic analysis; this code just generates RTL. */
6760 if (flag_syntax_only
)
6763 /* Squirrel away our current state. */
6765 push_function_context ();
6767 /* Initialize the RTL code for the function. */
6768 current_function_decl
= fndecl
;
6769 init_function_start (fndecl
, input_filename
, DECL_SOURCE_LINE (fndecl
));
6771 /* This function is being processed in whole-function mode. */
6772 cfun
->x_whole_function_mode_p
= 1;
6774 /* Even though we're inside a function body, we still don't want to
6775 call expand_expr to calculate the size of a variable-sized array.
6776 We haven't necessarily assigned RTL to all variables yet, so it's
6777 not safe to try to expand expressions involving them. */
6778 immediate_size_expand
= 0;
6779 cfun
->x_dont_save_pending_sizes_p
= 1;
6781 /* If this is a varargs function, inform function.c. */
6782 if (c_function_varargs
)
6785 /* Set up parameters and prepare for return, for the function. */
6786 expand_function_start (fndecl
, 0);
6788 /* If this function is `main', emit a call to `__main'
6789 to run global initializers, etc. */
6790 if (DECL_NAME (fndecl
)
6791 && MAIN_NAME_P (DECL_NAME (fndecl
))
6792 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6793 expand_main_function ();
6795 /* Generate the RTL for this function. */
6796 expand_stmt (DECL_SAVED_TREE (fndecl
));
6797 /* Allow the body of the function to be garbage collected. */
6798 DECL_SAVED_TREE (fndecl
) = NULL_TREE
;
6800 /* We hard-wired immediate_size_expand to zero in start_function.
6801 expand_function_end will decrement this variable. So, we set the
6802 variable to one here, so that after the decrement it will remain
6804 immediate_size_expand
= 1;
6806 /* Allow language dialects to perform special processing. */
6807 if (lang_expand_function_end
)
6808 (*lang_expand_function_end
) ();
6810 /* Generate rtl for function exit. */
6811 expand_function_end (input_filename
, lineno
, 0);
6813 /* If this is a nested function, protect the local variables in the stack
6814 above us from being collected while we're compiling this function. */
6816 ggc_push_context ();
6818 /* Run the optimizers and output the assembler code for this function. */
6819 rest_of_compilation (fndecl
);
6821 /* Undo the GC context switch. */
6825 /* With just -W, complain only if function returns both with
6826 and without a value. */
6828 && current_function_returns_value
6829 && current_function_returns_null
)
6830 warning ("this function may return with or without a value");
6832 /* If requested, warn about function definitions where the function will
6833 return a value (usually of some struct or union type) which itself will
6834 take up a lot of stack space. */
6836 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6838 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6840 if (ret_type
&& TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
6841 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
6844 unsigned int size_as_int
6845 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
6847 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
6848 warning_with_decl (fndecl
,
6849 "size of return value of `%s' is %u bytes",
6852 warning_with_decl (fndecl
,
6853 "size of return value of `%s' is larger than %d bytes",
6858 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested_p
)
6860 /* Stop pointing to the local nodes about to be freed.
6861 But DECL_INITIAL must remain nonzero so we know this
6862 was an actual function definition.
6863 For a nested function, this is done in pop_c_function_context.
6864 If rest_of_compilation set this to 0, leave it 0. */
6865 if (DECL_INITIAL (fndecl
) != 0)
6866 DECL_INITIAL (fndecl
) = error_mark_node
;
6868 DECL_ARGUMENTS (fndecl
) = 0;
6871 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6873 #ifndef ASM_OUTPUT_CONSTRUCTOR
6874 if (! flag_gnu_linker
)
6875 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6878 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6881 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6883 #ifndef ASM_OUTPUT_DESTRUCTOR
6884 if (! flag_gnu_linker
)
6885 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6888 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6893 /* Return to the enclosing function. */
6894 pop_function_context ();
6895 /* If the nested function was inline, write it out if that is
6897 if (!TREE_ASM_WRITTEN (fndecl
) && TREE_ADDRESSABLE (fndecl
))
6899 push_function_context ();
6900 output_inline_function (fndecl
);
6901 pop_function_context ();
6907 /* Check the declarations given in a for-loop for satisfying the C99
6910 check_for_loop_decls ()
6916 /* If we get here, declarations have been used in a for loop without
6917 the C99 for loop scope. This doesn't make much sense, so don't
6919 error ("`for' loop initial declaration used outside C99 mode");
6922 /* C99 subclause 6.8.5 paragraph 3:
6924 [#3] The declaration part of a for statement shall only
6925 declare identifiers for objects having storage class auto or
6928 It isn't clear whether, in this sentence, "identifiers" binds to
6929 "shall only declare" or to "objects" - that is, whether all identifiers
6930 declared must be identifiers for objects, or whether the restriction
6931 only applies to those that are. (A question on this in comp.std.c
6932 in November 2000 received no answer.) We implement the strictest
6933 interpretation, to avoid creating an extension which later causes
6936 for (t
= gettags (); t
; t
= TREE_CHAIN (t
))
6938 if (TREE_PURPOSE (t
) != 0)
6939 error ("`%s %s' declared in `for' loop initial declaration",
6940 (TREE_CODE (TREE_VALUE (t
)) == RECORD_TYPE
? "struct"
6941 : TREE_CODE (TREE_VALUE (t
)) == UNION_TYPE
? "union"
6943 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6945 for (t
= getdecls (); t
; t
= TREE_CHAIN (t
))
6947 if (TREE_CODE (t
) != VAR_DECL
&& DECL_NAME (t
))
6948 error_with_decl (t
, "declaration of non-variable `%s' in `for' loop initial declaration");
6949 else if (TREE_STATIC (t
))
6950 error_with_decl (t
, "declaration of static variable `%s' in `for' loop initial declaration");
6951 else if (DECL_EXTERNAL (t
))
6952 error_with_decl (t
, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6956 /* Save and restore the variables in this file and elsewhere
6957 that keep track of the progress of compilation of the current function.
6958 Used for nested functions. */
6960 struct c_language_function
6962 struct language_function base
;
6964 tree shadowed_labels
;
6967 int warn_about_return_type
;
6969 struct binding_level
*binding_level
;
6972 /* Save and reinitialize the variables
6973 used during compilation of a C function. */
6976 push_c_function_context (f
)
6979 struct c_language_function
*p
;
6980 p
= ((struct c_language_function
*)
6981 xmalloc (sizeof (struct c_language_function
)));
6982 f
->language
= (struct language_function
*) p
;
6984 p
->base
.x_stmt_tree
= c_stmt_tree
;
6985 p
->base
.x_scope_stmt_stack
= c_scope_stmt_stack
;
6986 p
->base
.x_function_name_declared_p
= c_function_name_declared_p
;
6987 p
->named_labels
= named_labels
;
6988 p
->shadowed_labels
= shadowed_labels
;
6989 p
->returns_value
= current_function_returns_value
;
6990 p
->returns_null
= current_function_returns_null
;
6991 p
->warn_about_return_type
= warn_about_return_type
;
6992 p
->extern_inline
= current_extern_inline
;
6993 p
->binding_level
= current_binding_level
;
6996 /* Restore the variables used during compilation of a C function. */
6999 pop_c_function_context (f
)
7002 struct c_language_function
*p
7003 = (struct c_language_function
*) f
->language
;
7006 /* Bring back all the labels that were shadowed. */
7007 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7008 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7009 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7010 = TREE_VALUE (link
);
7012 if (DECL_SAVED_INSNS (current_function_decl
) == 0
7013 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
7015 /* Stop pointing to the local nodes about to be freed. */
7016 /* But DECL_INITIAL must remain nonzero so we know this
7017 was an actual function definition. */
7018 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7019 DECL_ARGUMENTS (current_function_decl
) = 0;
7022 c_stmt_tree
= p
->base
.x_stmt_tree
;
7023 c_scope_stmt_stack
= p
->base
.x_scope_stmt_stack
;
7024 c_function_name_declared_p
= p
->base
.x_function_name_declared_p
;
7025 named_labels
= p
->named_labels
;
7026 shadowed_labels
= p
->shadowed_labels
;
7027 current_function_returns_value
= p
->returns_value
;
7028 current_function_returns_null
= p
->returns_null
;
7029 warn_about_return_type
= p
->warn_about_return_type
;
7030 current_extern_inline
= p
->extern_inline
;
7031 current_binding_level
= p
->binding_level
;
7037 /* Mark the language specific parts of F for GC. */
7040 mark_c_function_context (f
)
7043 struct c_language_function
*p
7044 = (struct c_language_function
*) f
->language
;
7049 mark_c_language_function (&p
->base
);
7050 ggc_mark_tree (p
->shadowed_labels
);
7051 ggc_mark_tree (p
->named_labels
);
7052 mark_binding_level (&p
->binding_level
);
7055 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7058 copy_lang_decl (decl
)
7061 struct lang_decl
*ld
;
7063 if (!DECL_LANG_SPECIFIC (decl
))
7066 ld
= (struct lang_decl
*) ggc_alloc (sizeof (struct lang_decl
));
7067 memcpy ((char *) ld
, (char *) DECL_LANG_SPECIFIC (decl
),
7068 sizeof (struct lang_decl
));
7069 DECL_LANG_SPECIFIC (decl
) = ld
;
7072 /* Mark the language specific bits in T for GC. */
7078 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
7080 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
7081 ggc_mark_tree (i
->global_value
);
7082 ggc_mark_tree (i
->local_value
);
7083 ggc_mark_tree (i
->label_value
);
7084 ggc_mark_tree (i
->implicit_decl
);
7085 ggc_mark_tree (i
->error_locus
);
7086 ggc_mark_tree (i
->limbo_value
);
7088 else if (TYPE_P (t
) && TYPE_LANG_SPECIFIC (t
))
7089 ggc_mark (TYPE_LANG_SPECIFIC (t
));
7090 else if (DECL_P (t
) && DECL_LANG_SPECIFIC (t
))
7092 ggc_mark (DECL_LANG_SPECIFIC (t
));
7093 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t
)->base
);
7097 /* The functions below are required for functionality of doing
7098 function at once processing in the C front end. Currently these
7099 functions are not called from anywhere in the C front end, but as
7100 these changes continue, that will change. */
7102 /* Returns non-zero if the current statement is a full expression,
7103 i.e. temporaries created during that statement should be destroyed
7104 at the end of the statement. */
7107 stmts_are_full_exprs_p ()
7112 /* Returns the stmt_tree (if any) to which statements are currently
7113 being added. If there is no active statement-tree, NULL is
7117 current_stmt_tree ()
7119 return &c_stmt_tree
;
7122 /* Returns the stack of SCOPE_STMTs for the current function. */
7125 current_scope_stmt_stack ()
7127 return &c_scope_stmt_stack
;
7130 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7134 anon_aggr_type_p (node
)
7135 tree node ATTRIBUTE_UNUSED
;
7140 /* Dummy function in place of callback used by C++. */
7143 extract_interface_info ()
7147 /* Return a new COMPOUND_STMT, after adding it to the current
7151 c_begin_compound_stmt ()
7155 /* Create the COMPOUND_STMT. */
7156 stmt
= add_stmt (build_stmt (COMPOUND_STMT
, NULL_TREE
));
7157 /* If we haven't already declared __FUNCTION__ and its ilk then this
7158 is the opening curly brace of the function. Declare them now. */
7159 if (!c_function_name_declared_p
)
7161 c_function_name_declared_p
= 1;
7162 declare_function_name ();
7168 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7172 c_expand_decl_stmt (t
)
7175 tree decl
= DECL_STMT_DECL (t
);
7177 /* Expand nested functions. */
7178 if (TREE_CODE (decl
) == FUNCTION_DECL
7179 && DECL_CONTEXT (decl
) == current_function_decl
7180 && DECL_SAVED_TREE (decl
))
7181 c_expand_body (decl
, /*nested_p=*/1);
7184 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7185 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7188 identifier_global_value (t
)
7191 return IDENTIFIER_GLOBAL_VALUE (t
);