1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL
, /* Ordinary declaration */
53 FUNCDEF
, /* Function definition */
54 PARM
, /* Declaration of parm before function body */
55 FIELD
, /* Declaration inside struct or union */
56 BITFIELD
, /* Likewise but with specified width */
57 TYPENAME
}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref
;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file
;
66 int pending_invalid_xref_line
;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value
;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow
;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms
;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags
;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms
;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags
;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file
;
102 static int current_function_prototype_line
;
104 /* The current statement tree. */
106 static struct stmt_tree_s c_stmt_tree
;
108 /* The current scope statement stack. */
110 static tree c_scope_stmt_stack
;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static tree named_labels
;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static tree shadowed_labels
;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs
;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value
;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null
;
137 /* Set to nonzero by `grokdeclarator' for a function
138 whose return type is defaulted, if warnings for this are desired. */
140 static int warn_about_return_type
;
142 /* Nonzero when starting a function declared `extern inline'. */
144 static int current_extern_inline
;
146 /* For each binding contour we allocate a binding_level structure
147 * which records the names defined in that contour.
150 * 1) one for each function definition,
151 * where internal declarations of the parameters appear.
152 * 2) one for each compound statement,
153 * to record its declarations.
155 * The current meaning of a name can be found by searching the levels from
156 * the current one out to the global one.
159 /* Note that the information in the `names' component of the global contour
160 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
164 /* A chain of _DECL nodes for all variables, constants, functions,
165 and typedef types. These are in the reverse of the order supplied.
169 /* A list of structure, union and enum definitions,
170 * for looking up tag names.
171 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
172 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
173 * or ENUMERAL_TYPE node.
177 /* For each level, a list of shadowed outer-level local definitions
178 to be restored when this level is popped.
179 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
180 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
183 /* For each level (except not the global one),
184 a chain of BLOCK nodes for all the levels
185 that were entered and exited one level down. */
188 /* The BLOCK node for this level, if one has been preallocated.
189 If 0, the BLOCK is allocated (if needed) when the level is popped. */
192 /* The binding level which this one is contained in (inherits from). */
193 struct binding_level
*level_chain
;
195 /* Nonzero for the level that holds the parameters of a function. */
198 /* Nonzero if this level "doesn't exist" for tags. */
199 char tag_transparent
;
201 /* Nonzero if sublevels of this level "don't exist" for tags.
202 This is set in the parm level of a function definition
203 while reading the function body, so that the outermost block
204 of the function body will be tag-transparent. */
205 char subblocks_tag_transparent
;
207 /* Nonzero means make a BLOCK for this level regardless of all else. */
210 /* Nonzero means make a BLOCK if this level has any subblocks. */
211 char keep_if_subblocks
;
213 /* Number of decls in `names' that have incomplete
214 structure or union types. */
217 /* A list of decls giving the (reversed) specified order of parms,
218 not including any forward-decls in the parmlist.
219 This is so we can put the parms in proper order for assign_parms. */
223 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
225 /* The binding level currently in effect. */
227 static struct binding_level
*current_binding_level
;
229 /* A chain of binding_level structures awaiting reuse. */
231 static struct binding_level
*free_binding_level
;
233 /* The outermost binding level, for names of file scope.
234 This is created when the compiler is started and exists
235 through the entire run. */
237 static struct binding_level
*global_binding_level
;
239 /* Binding level structures are initialized by copying this one. */
241 static struct binding_level clear_binding_level
242 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
245 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
247 static int keep_next_level_flag
;
249 /* Nonzero means make a BLOCK for the next level pushed
250 if it has subblocks. */
252 static int keep_next_if_subblocks
;
254 /* The chain of outer levels of label scopes.
255 This uses the same data structure used for binding levels,
256 but it works differently: each link in the chain records
257 saved values of named_labels and shadowed_labels for
258 a label binding level outside the current one. */
260 static struct binding_level
*label_level_chain
;
262 /* Functions called automatically at the beginning and end of execution. */
264 tree static_ctors
, static_dtors
;
266 /* Forward declarations. */
268 static struct binding_level
* make_binding_level
PARAMS ((void));
269 static void mark_binding_level
PARAMS ((void *));
270 static void clear_limbo_values
PARAMS ((tree
));
271 static int duplicate_decls
PARAMS ((tree
, tree
, int));
272 static int redeclaration_error_message
PARAMS ((tree
, tree
));
273 static void storedecls
PARAMS ((tree
));
274 static void storetags
PARAMS ((tree
));
275 static tree lookup_tag
PARAMS ((enum tree_code
, tree
,
276 struct binding_level
*, int));
277 static tree lookup_tag_reverse
PARAMS ((tree
));
278 static tree grokdeclarator
PARAMS ((tree
, tree
, enum decl_context
,
280 static tree grokparms
PARAMS ((tree
, int));
281 static void layout_array_type
PARAMS ((tree
));
282 static tree c_make_fname_decl
PARAMS ((tree
, int));
283 static void c_expand_body
PARAMS ((tree
, int, int));
284 static void warn_if_shadowing
PARAMS ((tree
, tree
));
286 /* C-specific option variables. */
288 /* Nonzero means allow type mismatches in conditional expressions;
289 just make their values `void'. */
291 int flag_cond_mismatch
;
293 /* Nonzero means don't recognize the keyword `asm'. */
297 /* Nonzero means do some things the same way PCC does. */
299 int flag_traditional
;
301 /* Nonzero means enable C89 Amendment 1 features. */
305 /* Nonzero means use the ISO C99 dialect of C. */
309 /* Nonzero means that we have builtin functions, and main is an int */
313 /* Nonzero means add default format_arg attributes for functions not
316 int flag_noniso_default_format_attributes
= 1;
318 /* Nonzero means to allow single precision math even if we're generally
319 being traditional. */
320 int flag_allow_single_precision
= 0;
322 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
324 int flag_signed_bitfields
= 1;
325 int explicit_flag_signed_bitfields
= 0;
327 /* Nonzero means warn about use of implicit int. */
329 int warn_implicit_int
;
331 /* Nonzero means warn about usage of long long when `-pedantic'. */
333 int warn_long_long
= 1;
335 /* Nonzero means message about use of implicit function declarations;
336 1 means warning; 2 means error. */
338 int mesg_implicit_function_declaration
= -1;
340 /* Nonzero means give string constants the type `const char *'
341 to get extra warnings from them. These warnings will be too numerous
342 to be useful, except in thoroughly ANSIfied programs. */
344 int flag_const_strings
;
346 /* Nonzero means warn about pointer casts that can drop a type qualifier
347 from the pointer target type. */
351 /* Nonzero means warn when casting a function call to a type that does
352 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
353 when there is no previous declaration of sqrt or malloc. */
355 int warn_bad_function_cast
;
357 /* Warn about functions which might be candidates for format attributes. */
359 int warn_missing_format_attribute
;
361 /* Warn about traditional constructs whose meanings changed in ANSI C. */
363 int warn_traditional
;
365 /* Nonzero means warn about sizeof(function) or addition/subtraction
366 of function pointers. */
368 int warn_pointer_arith
;
370 /* Nonzero means warn for non-prototype function decls
371 or non-prototyped defs without previous prototype. */
373 int warn_strict_prototypes
;
375 /* Nonzero means warn for any global function def
376 without separate previous prototype decl. */
378 int warn_missing_prototypes
;
380 /* Nonzero means warn for any global function def
381 without separate previous decl. */
383 int warn_missing_declarations
;
385 /* Nonzero means warn about multiple (redundant) decls for the same single
386 variable or function. */
388 int warn_redundant_decls
= 0;
390 /* Nonzero means warn about extern declarations of objects not at
391 file-scope level and about *all* declarations of functions (whether
392 extern or static) not at file-scope level. Note that we exclude
393 implicit function declarations. To get warnings about those, use
396 int warn_nested_externs
= 0;
398 /* Warn about a subscript that has type char. */
400 int warn_char_subscripts
= 0;
402 /* Warn if a type conversion is done that might have confusing results. */
406 /* Warn if adding () is suggested. */
408 int warn_parentheses
;
410 /* Warn if initializer is not completely bracketed. */
412 int warn_missing_braces
;
414 /* Warn if main is suspicious. */
418 /* Warn about #pragma directives that are not recognised. */
420 int warn_unknown_pragmas
= 0; /* Tri state variable. */
422 /* Warn about comparison of signed and unsigned values.
423 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
425 int warn_sign_compare
= -1;
427 /* Warn about testing equality of floating point numbers. */
429 int warn_float_equal
= 0;
431 /* Nonzero means warn about use of multicharacter literals. */
433 int warn_multichar
= 1;
435 /* Nonzero means `$' can be in an identifier. */
437 #ifndef DOLLARS_IN_IDENTIFIERS
438 #define DOLLARS_IN_IDENTIFIERS 1
440 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
442 /* States indicating how grokdeclarator() should handle declspecs marked
443 with __attribute__((deprecated)). An object declared as
444 __attribute__((deprecated)) suppresses warnings of uses of other
447 enum deprecated_states
{
452 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
454 /* Decode the string P as a language-specific option for C.
455 Return the number of strings consumed. Should not complain
456 if it does not recognise the option. */
459 c_decode_option (argc
, argv
)
460 int argc ATTRIBUTE_UNUSED
;
463 int strings_processed
;
466 strings_processed
= cpp_handle_option (parse_in
, argc
, argv
);
468 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
470 warning ("-traditional is deprecated and may be removed");
471 flag_traditional
= 1;
472 flag_writable_strings
= 1;
474 else if (!strcmp (p
, "-fallow-single-precision"))
475 flag_allow_single_precision
= 1;
476 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
481 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
485 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
489 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
491 flag_traditional
= 0;
492 flag_writable_strings
= 0;
494 else if (!strncmp (p
, "-std=", 5))
496 /* Select the appropriate language standard. We currently
498 -std=iso9899:1990 same as -ansi
499 -std=iso9899:199409 ISO C as modified in amend. 1
500 -std=iso9899:1999 ISO C 99
501 -std=c89 same as -std=iso9899:1990
502 -std=c99 same as -std=iso9899:1999
503 -std=gnu89 default, iso9899:1990 + gnu extensions
504 -std=gnu99 iso9899:1999 + gnu extensions
506 const char *const argstart
= &p
[5];
508 if (!strcmp (argstart
, "iso9899:1990")
509 || !strcmp (argstart
, "c89"))
514 flag_traditional
= 0;
515 flag_writable_strings
= 0;
517 flag_no_nonansi_builtin
= 1;
518 flag_noniso_default_format_attributes
= 0;
521 else if (!strcmp (argstart
, "iso9899:199409"))
526 else if (!strcmp (argstart
, "iso9899:199x")
527 || !strcmp (argstart
, "iso9899:1999")
528 || !strcmp (argstart
, "c9x")
529 || !strcmp (argstart
, "c99"))
531 flag_traditional
= 0;
532 flag_writable_strings
= 0;
534 flag_no_nonansi_builtin
= 1;
535 flag_noniso_default_format_attributes
= 0;
539 else if (!strcmp (argstart
, "gnu89"))
541 flag_traditional
= 0;
542 flag_writable_strings
= 0;
544 flag_no_nonansi_builtin
= 0;
545 flag_noniso_default_format_attributes
= 1;
549 else if (!strcmp (argstart
, "gnu9x") || !strcmp (argstart
, "gnu99"))
551 flag_traditional
= 0;
552 flag_writable_strings
= 0;
554 flag_no_nonansi_builtin
= 0;
555 flag_noniso_default_format_attributes
= 1;
560 error ("unknown C standard `%s'", argstart
);
562 else if (!strcmp (p
, "-fdollars-in-identifiers"))
563 dollars_in_ident
= 1;
564 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
565 dollars_in_ident
= 0;
566 else if (!strcmp (p
, "-fsigned-char"))
567 flag_signed_char
= 1;
568 else if (!strcmp (p
, "-funsigned-char"))
569 flag_signed_char
= 0;
570 else if (!strcmp (p
, "-fno-signed-char"))
571 flag_signed_char
= 0;
572 else if (!strcmp (p
, "-fno-unsigned-char"))
573 flag_signed_char
= 1;
574 else if (!strcmp (p
, "-fsigned-bitfields")
575 || !strcmp (p
, "-fno-unsigned-bitfields"))
577 flag_signed_bitfields
= 1;
578 explicit_flag_signed_bitfields
= 1;
580 else if (!strcmp (p
, "-funsigned-bitfields")
581 || !strcmp (p
, "-fno-signed-bitfields"))
583 flag_signed_bitfields
= 0;
584 explicit_flag_signed_bitfields
= 1;
586 else if (!strcmp (p
, "-fshort-enums"))
587 flag_short_enums
= 1;
588 else if (!strcmp (p
, "-fno-short-enums"))
589 flag_short_enums
= 0;
590 else if (!strcmp (p
, "-fshort-wchar"))
591 flag_short_wchar
= 1;
592 else if (!strcmp (p
, "-fno-short-wchar"))
593 flag_short_wchar
= 0;
594 else if (!strcmp (p
, "-fcond-mismatch"))
595 flag_cond_mismatch
= 1;
596 else if (!strcmp (p
, "-fno-cond-mismatch"))
597 flag_cond_mismatch
= 0;
598 else if (!strcmp (p
, "-fshort-double"))
599 flag_short_double
= 1;
600 else if (!strcmp (p
, "-fno-short-double"))
601 flag_short_double
= 0;
602 else if (!strcmp (p
, "-fasm"))
604 else if (!strcmp (p
, "-fno-asm"))
606 else if (!strcmp (p
, "-fbuiltin"))
608 else if (!strcmp (p
, "-fno-builtin"))
610 else if (!strncmp (p
, "-fno-builtin-", strlen ("-fno-builtin-")))
611 disable_builtin_function (p
+ strlen ("-fno-builtin-"));
612 else if (p
[0] == '-' && p
[1] == 'f' && dump_switch_p (p
+ 2))
614 else if (!strcmp (p
, "-ansi"))
616 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
617 mesg_implicit_function_declaration
= 2;
618 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
619 mesg_implicit_function_declaration
= 1;
620 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
621 mesg_implicit_function_declaration
= 0;
622 else if (!strcmp (p
, "-Wimplicit-int"))
623 warn_implicit_int
= 1;
624 else if (!strcmp (p
, "-Wno-implicit-int"))
625 warn_implicit_int
= 0;
626 else if (!strcmp (p
, "-Wimplicit"))
628 warn_implicit_int
= 1;
629 if (mesg_implicit_function_declaration
!= 2)
630 mesg_implicit_function_declaration
= 1;
632 else if (!strcmp (p
, "-Wno-implicit"))
633 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
634 else if (!strcmp (p
, "-Wlong-long"))
636 else if (!strcmp (p
, "-Wno-long-long"))
638 else if (!strcmp (p
, "-Wwrite-strings"))
639 flag_const_strings
= 1;
640 else if (!strcmp (p
, "-Wno-write-strings"))
641 flag_const_strings
= 0;
642 else if (!strcmp (p
, "-Wcast-qual"))
644 else if (!strcmp (p
, "-Wno-cast-qual"))
646 else if (!strcmp (p
, "-Wbad-function-cast"))
647 warn_bad_function_cast
= 1;
648 else if (!strcmp (p
, "-Wno-bad-function-cast"))
649 warn_bad_function_cast
= 0;
650 else if (!strcmp (p
, "-Wno-missing-noreturn"))
651 warn_missing_noreturn
= 0;
652 else if (!strcmp (p
, "-Wmissing-format-attribute"))
653 warn_missing_format_attribute
= 1;
654 else if (!strcmp (p
, "-Wno-missing-format-attribute"))
655 warn_missing_format_attribute
= 0;
656 else if (!strcmp (p
, "-Wpointer-arith"))
657 warn_pointer_arith
= 1;
658 else if (!strcmp (p
, "-Wno-pointer-arith"))
659 warn_pointer_arith
= 0;
660 else if (!strcmp (p
, "-Wstrict-prototypes"))
661 warn_strict_prototypes
= 1;
662 else if (!strcmp (p
, "-Wno-strict-prototypes"))
663 warn_strict_prototypes
= 0;
664 else if (!strcmp (p
, "-Wmissing-prototypes"))
665 warn_missing_prototypes
= 1;
666 else if (!strcmp (p
, "-Wno-missing-prototypes"))
667 warn_missing_prototypes
= 0;
668 else if (!strcmp (p
, "-Wmissing-declarations"))
669 warn_missing_declarations
= 1;
670 else if (!strcmp (p
, "-Wno-missing-declarations"))
671 warn_missing_declarations
= 0;
672 else if (!strcmp (p
, "-Wredundant-decls"))
673 warn_redundant_decls
= 1;
674 else if (!strcmp (p
, "-Wno-redundant-decls"))
675 warn_redundant_decls
= 0;
676 else if (!strcmp (p
, "-Wnested-externs"))
677 warn_nested_externs
= 1;
678 else if (!strcmp (p
, "-Wno-nested-externs"))
679 warn_nested_externs
= 0;
680 else if (!strcmp (p
, "-Wtraditional"))
681 warn_traditional
= 1;
682 else if (!strcmp (p
, "-Wno-traditional"))
683 warn_traditional
= 0;
684 else if (!strncmp (p
, "-Wformat=", 9))
685 set_Wformat (atoi (p
+ 9));
686 else if (!strcmp (p
, "-Wformat"))
688 else if (!strcmp (p
, "-Wno-format"))
690 else if (!strcmp (p
, "-Wformat-y2k"))
692 else if (!strcmp (p
, "-Wno-format-y2k"))
694 else if (!strcmp (p
, "-Wformat-extra-args"))
695 warn_format_extra_args
= 1;
696 else if (!strcmp (p
, "-Wno-format-extra-args"))
697 warn_format_extra_args
= 0;
698 else if (!strcmp (p
, "-Wformat-nonliteral"))
699 warn_format_nonliteral
= 1;
700 else if (!strcmp (p
, "-Wno-format-nonliteral"))
701 warn_format_nonliteral
= 0;
702 else if (!strcmp (p
, "-Wformat-security"))
703 warn_format_security
= 1;
704 else if (!strcmp (p
, "-Wno-format-security"))
705 warn_format_security
= 0;
706 else if (!strcmp (p
, "-Wchar-subscripts"))
707 warn_char_subscripts
= 1;
708 else if (!strcmp (p
, "-Wno-char-subscripts"))
709 warn_char_subscripts
= 0;
710 else if (!strcmp (p
, "-Wconversion"))
712 else if (!strcmp (p
, "-Wno-conversion"))
714 else if (!strcmp (p
, "-Wparentheses"))
715 warn_parentheses
= 1;
716 else if (!strcmp (p
, "-Wno-parentheses"))
717 warn_parentheses
= 0;
718 else if (!strcmp (p
, "-Wreturn-type"))
719 warn_return_type
= 1;
720 else if (!strcmp (p
, "-Wno-return-type"))
721 warn_return_type
= 0;
722 else if (!strcmp (p
, "-Wsequence-point"))
723 warn_sequence_point
= 1;
724 else if (!strcmp (p
, "-Wno-sequence-point"))
725 warn_sequence_point
= 0;
726 else if (!strcmp (p
, "-Wcomment"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p
, "-Wno-comment"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p
, "-Wcomments"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p
, "-Wno-comments"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p
, "-Wtrigraphs"))
735 ; /* cpp handles this one. */
736 else if (!strcmp (p
, "-Wno-trigraphs"))
737 ; /* cpp handles this one. */
738 else if (!strcmp (p
, "-Wundef"))
739 ; /* cpp handles this one. */
740 else if (!strcmp (p
, "-Wno-undef"))
741 ; /* cpp handles this one. */
742 else if (!strcmp (p
, "-Wimport"))
743 ; /* cpp handles this one. */
744 else if (!strcmp (p
, "-Wno-import"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p
, "-Wmissing-braces"))
747 warn_missing_braces
= 1;
748 else if (!strcmp (p
, "-Wno-missing-braces"))
749 warn_missing_braces
= 0;
750 else if (!strcmp (p
, "-Wmain"))
752 else if (!strcmp (p
, "-Wno-main"))
754 else if (!strcmp (p
, "-Wsign-compare"))
755 warn_sign_compare
= 1;
756 else if (!strcmp (p
, "-Wno-sign-compare"))
757 warn_sign_compare
= 0;
758 else if (!strcmp (p
, "-Wfloat-equal"))
759 warn_float_equal
= 1;
760 else if (!strcmp (p
, "-Wno-float-equal"))
761 warn_float_equal
= 0;
762 else if (!strcmp (p
, "-Wmultichar"))
764 else if (!strcmp (p
, "-Wno-multichar"))
766 else if (!strcmp (p
, "-Wdiv-by-zero"))
767 warn_div_by_zero
= 1;
768 else if (!strcmp (p
, "-Wno-div-by-zero"))
769 warn_div_by_zero
= 0;
770 else if (!strcmp (p
, "-Wunknown-pragmas"))
771 /* Set to greater than 1, so that even unknown pragmas in system
772 headers will be warned about. */
773 warn_unknown_pragmas
= 2;
774 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
775 warn_unknown_pragmas
= 0;
776 else if (!strcmp (p
, "-Wall"))
778 /* We save the value of warn_uninitialized, since if they put
779 -Wuninitialized on the command line, we need to generate a
780 warning about not using it without also specifying -O. */
781 if (warn_uninitialized
!= 1)
782 warn_uninitialized
= 2;
783 warn_implicit_int
= 1;
784 mesg_implicit_function_declaration
= 1;
785 warn_return_type
= 1;
789 warn_char_subscripts
= 1;
790 warn_parentheses
= 1;
791 warn_sequence_point
= 1;
792 warn_missing_braces
= 1;
793 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
794 it off only if it's not explicit. */
796 /* Only warn about unknown pragmas that are not in system headers. */
797 warn_unknown_pragmas
= 1;
800 return strings_processed
;
806 c_print_identifier (file
, node
, indent
)
811 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
812 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
813 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
814 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
815 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
816 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
817 if (C_IS_RESERVED_WORD (node
))
819 tree rid
= ridpointers
[C_RID_CODE (node
)];
820 indent_to (file
, indent
+ 4);
821 fprintf (file
, "rid ");
822 fprintf (file
, HOST_PTR_PRINTF
, (void *)rid
);
823 fprintf (file
, " \"%s\"", IDENTIFIER_POINTER (rid
));
827 /* Hook called at end of compilation to assume 1 elt
828 for a top-level tentative array defn that wasn't complete before. */
831 finish_incomplete_decl (decl
)
834 if (TREE_CODE (decl
) == VAR_DECL
)
836 tree type
= TREE_TYPE (decl
);
837 if (type
!= error_mark_node
838 && TREE_CODE (type
) == ARRAY_TYPE
839 && ! DECL_EXTERNAL (decl
)
840 && TYPE_DOMAIN (type
) == 0)
842 warning_with_decl (decl
, "array `%s' assumed to have one element");
844 complete_array_type (type
, NULL_TREE
, 1);
846 layout_decl (decl
, 0);
851 /* Create a new `struct binding_level'. */
853 static struct binding_level
*
854 make_binding_level ()
857 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
860 /* Nonzero if we are currently in the global binding level. */
865 return current_binding_level
== global_binding_level
;
871 keep_next_level_flag
= 1;
874 /* Nonzero if the current level needs to have a BLOCK made. */
879 return ((current_binding_level
->keep_if_subblocks
880 && current_binding_level
->blocks
!= 0)
881 || current_binding_level
->keep
882 || current_binding_level
->names
!= 0
883 || (current_binding_level
->tags
!= 0
884 && !current_binding_level
->tag_transparent
));
887 /* Identify this binding level as a level of parameters.
888 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
889 But it turns out there is no way to pass the right value for
890 DEFINITION_FLAG, so we ignore it. */
893 declare_parm_level (definition_flag
)
894 int definition_flag ATTRIBUTE_UNUSED
;
896 current_binding_level
->parm_flag
= 1;
899 /* Nonzero if currently making parm declarations. */
904 return current_binding_level
->parm_flag
;
907 /* Enter a new binding level.
908 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
909 not for that of tags. */
912 pushlevel (tag_transparent
)
915 struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
917 /* If this is the top level of a function,
918 just make sure that NAMED_LABELS is 0. */
920 if (current_binding_level
== global_binding_level
)
925 /* Reuse or create a struct for this binding level. */
927 if (free_binding_level
)
929 newlevel
= free_binding_level
;
930 free_binding_level
= free_binding_level
->level_chain
;
934 newlevel
= make_binding_level ();
937 /* Add this level to the front of the chain (stack) of levels that
940 *newlevel
= clear_binding_level
;
941 newlevel
->tag_transparent
943 || (current_binding_level
944 ? current_binding_level
->subblocks_tag_transparent
946 newlevel
->level_chain
= current_binding_level
;
947 current_binding_level
= newlevel
;
948 newlevel
->keep
= keep_next_level_flag
;
949 keep_next_level_flag
= 0;
950 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
951 keep_next_if_subblocks
= 0;
954 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
957 clear_limbo_values (block
)
962 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
963 if (DECL_NAME (tem
) != 0)
964 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
966 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
967 clear_limbo_values (tem
);
970 /* Exit a binding level.
971 Pop the level off, and restore the state of the identifier-decl mappings
972 that were in effect when this level was entered.
974 If KEEP is nonzero, this level had explicit declarations, so
975 and create a "block" (a BLOCK node) for the level
976 to record its declarations and subblocks for symbol table output.
978 If FUNCTIONBODY is nonzero, this level is the body of a function,
979 so create a block as if KEEP were set and also clear out all
982 If REVERSE is nonzero, reverse the order of decls before putting
983 them into the BLOCK. */
986 poplevel (keep
, reverse
, functionbody
)
992 /* The chain of decls was accumulated in reverse order.
993 Put it into forward order, just for cleanliness. */
995 tree tags
= current_binding_level
->tags
;
996 tree subblocks
= current_binding_level
->blocks
;
999 int block_previously_created
;
1001 keep
|= current_binding_level
->keep
;
1003 /* This warning is turned off because it causes warnings for
1004 declarations like `extern struct foo *x'. */
1006 /* Warn about incomplete structure types in this level. */
1007 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1008 if (!COMPLETE_TYPE_P (TREE_VALUE (link
)))
1010 tree type
= TREE_VALUE (link
);
1011 tree type_name
= TYPE_NAME (type
);
1012 char *id
= IDENTIFIER_POINTER (TREE_CODE (type_name
) == IDENTIFIER_NODE
1014 : DECL_NAME (type_name
));
1015 switch (TREE_CODE (type
))
1018 error ("`struct %s' incomplete in scope ending here", id
);
1021 error ("`union %s' incomplete in scope ending here", id
);
1024 error ("`enum %s' incomplete in scope ending here", id
);
1030 /* Get the decls in the order they were written.
1031 Usually current_binding_level->names is in reverse order.
1032 But parameter decls were previously put in forward order. */
1035 current_binding_level
->names
1036 = decls
= nreverse (current_binding_level
->names
);
1038 decls
= current_binding_level
->names
;
1040 /* Output any nested inline functions within this block
1041 if they weren't already output. */
1043 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1044 if (TREE_CODE (decl
) == FUNCTION_DECL
1045 && ! TREE_ASM_WRITTEN (decl
)
1046 && DECL_INITIAL (decl
) != 0
1047 && TREE_ADDRESSABLE (decl
))
1049 /* If this decl was copied from a file-scope decl
1050 on account of a block-scope extern decl,
1051 propagate TREE_ADDRESSABLE to the file-scope decl.
1053 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1054 true, since then the decl goes through save_for_inline_copying. */
1055 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1056 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1057 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1060 /* We used to warn about unused variables in expand_end_bindings,
1061 i.e. while generating RTL. But in function-at-a-time mode we may
1062 choose to never expand a function at all (e.g. auto inlining), so
1063 we do this explicitly now. */
1064 warn_about_unused_variables (getdecls ());
1066 /* If there were any declarations or structure tags in that level,
1067 or if this level is a function body,
1068 create a BLOCK to record them for the life of this function. */
1071 block_previously_created
= (current_binding_level
->this_block
!= 0);
1072 if (block_previously_created
)
1073 block
= current_binding_level
->this_block
;
1074 else if (keep
|| functionbody
1075 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1076 block
= make_node (BLOCK
);
1079 BLOCK_VARS (block
) = decls
;
1080 BLOCK_SUBBLOCKS (block
) = subblocks
;
1083 /* In each subblock, record that this is its superior. */
1085 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1086 BLOCK_SUPERCONTEXT (link
) = block
;
1088 /* Clear out the meanings of the local variables of this level. */
1090 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1092 if (DECL_NAME (link
) != 0)
1094 /* If the ident. was used or addressed via a local extern decl,
1095 don't forget that fact. */
1096 if (DECL_EXTERNAL (link
))
1098 if (TREE_USED (link
))
1099 TREE_USED (DECL_NAME (link
)) = 1;
1100 if (TREE_ADDRESSABLE (link
))
1101 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1103 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1107 /* Restore all name-meanings of the outer levels
1108 that were shadowed by this level. */
1110 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1111 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1113 /* If the level being exited is the top level of a function,
1114 check over all the labels, and clear out the current
1115 (function local) meanings of their names. */
1119 clear_limbo_values (block
);
1121 /* If this is the top level block of a function,
1122 the vars are the function's parameters.
1123 Don't leave them in the BLOCK because they are
1124 found in the FUNCTION_DECL instead. */
1126 BLOCK_VARS (block
) = 0;
1128 /* Clear out the definitions of all label names,
1129 since their scopes end here,
1130 and add them to BLOCK_VARS. */
1132 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1134 tree label
= TREE_VALUE (link
);
1136 if (DECL_INITIAL (label
) == 0)
1138 error_with_decl (label
, "label `%s' used but not defined");
1139 /* Avoid crashing later. */
1140 define_label (input_filename
, lineno
,
1143 else if (warn_unused_label
&& !TREE_USED (label
))
1144 warning_with_decl (label
, "label `%s' defined but not used");
1145 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1147 /* Put the labels into the "variables" of the
1148 top-level block, so debugger can see them. */
1149 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1150 BLOCK_VARS (block
) = label
;
1154 /* Pop the current level, and free the structure for reuse. */
1157 struct binding_level
*level
= current_binding_level
;
1158 current_binding_level
= current_binding_level
->level_chain
;
1160 level
->level_chain
= free_binding_level
;
1161 free_binding_level
= level
;
1164 /* Dispose of the block that we just made inside some higher level. */
1166 DECL_INITIAL (current_function_decl
) = block
;
1169 if (!block_previously_created
)
1170 current_binding_level
->blocks
1171 = chainon (current_binding_level
->blocks
, block
);
1173 /* If we did not make a block for the level just exited,
1174 any blocks made for inner levels
1175 (since they cannot be recorded as subblocks in that level)
1176 must be carried forward so they will later become subblocks
1177 of something else. */
1179 current_binding_level
->blocks
1180 = chainon (current_binding_level
->blocks
, subblocks
);
1182 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1183 binding contour so that they point to the appropriate construct, i.e.
1184 either to the current FUNCTION_DECL node, or else to the BLOCK node
1185 we just constructed.
1187 Note that for tagged types whose scope is just the formal parameter
1188 list for some function type specification, we can't properly set
1189 their TYPE_CONTEXTs here, because we don't have a pointer to the
1190 appropriate FUNCTION_TYPE node readily available to us. For those
1191 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1192 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1193 node which will represent the "scope" for these "parameter list local"
1197 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1198 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1200 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1201 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1204 TREE_USED (block
) = 1;
1209 /* Insert BLOCK at the end of the list of subblocks of the
1210 current binding level. This is used when a BIND_EXPR is expanded,
1211 to handle the BLOCK node inside the BIND_EXPR. */
1214 insert_block (block
)
1217 TREE_USED (block
) = 1;
1218 current_binding_level
->blocks
1219 = chainon (current_binding_level
->blocks
, block
);
1222 /* Set the BLOCK node for the innermost scope
1223 (the one we are currently in). */
1229 current_binding_level
->this_block
= block
;
1230 current_binding_level
->names
= chainon (current_binding_level
->names
,
1231 BLOCK_VARS (block
));
1232 current_binding_level
->blocks
= chainon (current_binding_level
->blocks
,
1233 BLOCK_SUBBLOCKS (block
));
1239 struct binding_level
*newlevel
;
1241 /* Reuse or create a struct for this binding level. */
1243 if (free_binding_level
)
1245 newlevel
= free_binding_level
;
1246 free_binding_level
= free_binding_level
->level_chain
;
1250 newlevel
= make_binding_level ();
1253 /* Add this level to the front of the chain (stack) of label levels. */
1255 newlevel
->level_chain
= label_level_chain
;
1256 label_level_chain
= newlevel
;
1258 newlevel
->names
= named_labels
;
1259 newlevel
->shadowed
= shadowed_labels
;
1261 shadowed_labels
= 0;
1267 struct binding_level
*level
= label_level_chain
;
1270 /* Clear out the definitions of the declared labels in this level.
1271 Leave in the list any ordinary, non-declared labels. */
1272 for (link
= named_labels
, prev
= 0; link
;)
1274 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1276 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1278 error_with_decl (TREE_VALUE (link
),
1279 "label `%s' used but not defined");
1280 /* Avoid crashing later. */
1281 define_label (input_filename
, lineno
,
1282 DECL_NAME (TREE_VALUE (link
)));
1284 else if (warn_unused_label
&& !TREE_USED (TREE_VALUE (link
)))
1285 warning_with_decl (TREE_VALUE (link
),
1286 "label `%s' defined but not used");
1287 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1289 /* Delete this element from the list. */
1290 link
= TREE_CHAIN (link
);
1292 TREE_CHAIN (prev
) = link
;
1294 named_labels
= link
;
1299 link
= TREE_CHAIN (link
);
1303 /* Bring back all the labels that were shadowed. */
1304 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1305 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1306 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1307 = TREE_VALUE (link
);
1309 named_labels
= chainon (named_labels
, level
->names
);
1310 shadowed_labels
= level
->shadowed
;
1312 /* Pop the current level, and free the structure for reuse. */
1313 label_level_chain
= label_level_chain
->level_chain
;
1314 level
->level_chain
= free_binding_level
;
1315 free_binding_level
= level
;
1318 /* Push a definition or a declaration of struct, union or enum tag "name".
1319 "type" should be the type node.
1320 We assume that the tag "name" is not already defined.
1322 Note that the definition may really be just a forward reference.
1323 In that case, the TYPE_SIZE will be zero. */
1326 pushtag (name
, type
)
1329 struct binding_level
*b
;
1331 /* Find the proper binding level for this type tag. */
1333 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1338 /* Record the identifier as the type's name if it has none. */
1340 if (TYPE_NAME (type
) == 0)
1341 TYPE_NAME (type
) = name
;
1344 b
->tags
= tree_cons (name
, type
, b
->tags
);
1346 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1347 tagged type we just added to the current binding level. This fake
1348 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1349 to output a representation of a tagged type, and it also gives
1350 us a convenient place to record the "scope start" address for the
1353 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1355 /* An approximation for now, so we can tell this is a function-scope tag.
1356 This will be updated in poplevel. */
1357 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1360 /* Handle when a new declaration NEWDECL
1361 has the same name as an old one OLDDECL
1362 in the same binding contour.
1363 Prints an error message if appropriate.
1365 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1366 Otherwise, return 0.
1368 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1369 and OLDDECL is in an outer binding level and should thus not be changed. */
1372 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1373 tree newdecl
, olddecl
;
1374 int different_binding_level
;
1376 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1377 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1378 && DECL_INITIAL (newdecl
) != 0);
1379 tree oldtype
= TREE_TYPE (olddecl
);
1380 tree newtype
= TREE_TYPE (newdecl
);
1383 if (DECL_P (olddecl
))
1385 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1386 && TREE_CODE (olddecl
) == FUNCTION_DECL
1387 && (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
)))
1389 if (DECL_DECLARED_INLINE_P (newdecl
)
1390 && DECL_UNINLINABLE (newdecl
)
1391 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1392 /* Already warned elsewhere. */;
1393 else if (DECL_DECLARED_INLINE_P (olddecl
)
1394 && DECL_UNINLINABLE (olddecl
)
1395 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1396 /* Already warned. */;
1397 else if (DECL_DECLARED_INLINE_P (newdecl
)
1398 && ! DECL_DECLARED_INLINE_P (olddecl
)
1399 && DECL_UNINLINABLE (olddecl
)
1400 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1402 warning_with_decl (newdecl
,
1403 "function `%s' redeclared as inline");
1404 warning_with_decl (olddecl
,
1405 "previous declaration of function `%s' with attribute noinline");
1407 else if (DECL_DECLARED_INLINE_P (olddecl
)
1408 && DECL_UNINLINABLE (newdecl
)
1409 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1411 warning_with_decl (newdecl
,
1412 "function `%s' redeclared with attribute noinline");
1413 warning_with_decl (olddecl
,
1414 "previous declaration of function `%s' was inline");
1418 DECL_ATTRIBUTES (newdecl
)
1419 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1422 if (TREE_CODE (newtype
) == ERROR_MARK
1423 || TREE_CODE (oldtype
) == ERROR_MARK
)
1426 /* New decl is completely inconsistent with the old one =>
1427 tell caller to replace the old one.
1428 This is always an error except in the case of shadowing a builtin. */
1429 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1431 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1432 && (DECL_BUILT_IN (olddecl
)
1433 || DECL_BUILT_IN_NONANSI (olddecl
)))
1435 /* If you declare a built-in or predefined function name as static,
1436 the old definition is overridden,
1437 but optionally warn this was a bad choice of name. */
1438 if (!TREE_PUBLIC (newdecl
))
1442 else if (DECL_BUILT_IN (olddecl
))
1443 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1445 warning_with_decl (newdecl
, "shadowing library function `%s'");
1447 /* Likewise, if the built-in is not ansi, then programs can
1448 override it even globally without an error. */
1449 else if (! DECL_BUILT_IN (olddecl
))
1450 warning_with_decl (newdecl
,
1451 "library function `%s' declared as non-function");
1453 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1454 warning_with_decl (newdecl
,
1455 "built-in function `%s' declared as non-function");
1457 warning_with_decl (newdecl
,
1458 "built-in function `%s' declared as non-function");
1462 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1463 error_with_decl (olddecl
, "previous declaration of `%s'");
1469 /* For real parm decl following a forward decl,
1470 return 1 so old decl will be reused. */
1471 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1472 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1475 /* The new declaration is the same kind of object as the old one.
1476 The declarations may partially match. Print warnings if they don't
1477 match enough. Ultimately, copy most of the information from the new
1478 decl to the old one, and keep using the old one. */
1480 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1481 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1482 && DECL_INITIAL (olddecl
) == 0)
1483 /* If -traditional, avoid error for redeclaring fcn
1484 after implicit decl. */
1486 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1487 && DECL_BUILT_IN (olddecl
))
1489 /* A function declaration for a built-in function. */
1490 if (!TREE_PUBLIC (newdecl
))
1492 /* If you declare a built-in function name as static, the
1493 built-in definition is overridden,
1494 but optionally warn this was a bad choice of name. */
1496 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1497 /* Discard the old built-in function. */
1500 else if (!types_match
)
1502 /* Accept the return type of the new declaration if same modes. */
1503 tree oldreturntype
= TREE_TYPE (oldtype
);
1504 tree newreturntype
= TREE_TYPE (newtype
);
1506 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1508 /* Function types may be shared, so we can't just modify
1509 the return type of olddecl's function type. */
1511 = build_function_type (newreturntype
,
1512 TYPE_ARG_TYPES (oldtype
));
1513 trytype
= build_type_attribute_variant (trytype
,
1514 TYPE_ATTRIBUTES (oldtype
));
1516 types_match
= comptypes (newtype
, trytype
);
1520 /* Accept harmless mismatch in first argument type also.
1521 This is for the ffs and fprintf builtins. */
1522 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1523 && TYPE_ARG_TYPES (oldtype
) != 0
1524 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1525 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1526 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1527 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1529 /* Function types may be shared, so we can't just modify
1530 the return type of olddecl's function type. */
1532 = build_function_type (TREE_TYPE (oldtype
),
1533 tree_cons (NULL_TREE
,
1534 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1535 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1536 trytype
= build_type_attribute_variant (trytype
,
1537 TYPE_ATTRIBUTES (oldtype
));
1539 types_match
= comptypes (newtype
, trytype
);
1543 if (! different_binding_level
)
1544 TREE_TYPE (olddecl
) = oldtype
;
1548 /* If types don't match for a built-in, throw away the built-in. */
1549 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1553 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1554 && DECL_SOURCE_LINE (olddecl
) == 0)
1556 /* A function declaration for a predeclared function
1557 that isn't actually built in. */
1558 if (!TREE_PUBLIC (newdecl
))
1560 /* If you declare it as static, the
1561 default definition is overridden. */
1564 else if (!types_match
)
1566 /* If the types don't match, preserve volatility indication.
1567 Later on, we will discard everything else about the
1568 default declaration. */
1569 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1572 /* Permit char *foo () to match void *foo (...) if not pedantic,
1573 if one of them came from a system header file. */
1574 else if (!types_match
1575 && TREE_CODE (olddecl
) == FUNCTION_DECL
1576 && TREE_CODE (newdecl
) == FUNCTION_DECL
1577 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1578 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1579 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1580 || DECL_IN_SYSTEM_HEADER (newdecl
))
1581 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1582 && TYPE_ARG_TYPES (oldtype
) == 0
1583 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1584 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1586 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1587 && TYPE_ARG_TYPES (newtype
) == 0
1588 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1589 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1592 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1593 /* Make sure we keep void * as ret type, not char *. */
1594 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1595 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1597 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1598 we will come back here again. */
1599 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1601 else if (!types_match
1602 /* Permit char *foo (int, ...); followed by char *foo ();
1604 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1606 /* Return types must still match. */
1607 && comptypes (TREE_TYPE (oldtype
),
1608 TREE_TYPE (newtype
))
1609 && TYPE_ARG_TYPES (newtype
) == 0))
1611 error_with_decl (newdecl
, "conflicting types for `%s'");
1612 /* Check for function type mismatch
1613 involving an empty arglist vs a nonempty one. */
1614 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1615 && comptypes (TREE_TYPE (oldtype
),
1616 TREE_TYPE (newtype
))
1617 && ((TYPE_ARG_TYPES (oldtype
) == 0
1618 && DECL_INITIAL (olddecl
) == 0)
1620 (TYPE_ARG_TYPES (newtype
) == 0
1621 && DECL_INITIAL (newdecl
) == 0)))
1623 /* Classify the problem further. */
1624 tree t
= TYPE_ARG_TYPES (oldtype
);
1626 t
= TYPE_ARG_TYPES (newtype
);
1627 for (; t
; t
= TREE_CHAIN (t
))
1629 tree type
= TREE_VALUE (t
);
1631 if (TREE_CHAIN (t
) == 0
1632 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1634 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1638 if (simple_type_promotes_to (type
) != NULL_TREE
)
1640 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1645 error_with_decl (olddecl
, "previous declaration of `%s'");
1649 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1655 error_with_decl (newdecl
, "redefinition of `%s'");
1658 error_with_decl (newdecl
, "redeclaration of `%s'");
1661 error_with_decl (newdecl
, "conflicting declarations of `%s'");
1667 error_with_decl (olddecl
,
1668 ((DECL_INITIAL (olddecl
)
1669 && current_binding_level
== global_binding_level
)
1670 ? "`%s' previously defined here"
1671 : "`%s' previously declared here"));
1673 else if (TREE_CODE (newdecl
) == TYPE_DECL
1674 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1675 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1677 warning_with_decl (newdecl
, "redefinition of `%s'");
1680 ((DECL_INITIAL (olddecl
)
1681 && current_binding_level
== global_binding_level
)
1682 ? "`%s' previously defined here"
1683 : "`%s' previously declared here"));
1685 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1686 && DECL_INITIAL (olddecl
) != 0
1687 && TYPE_ARG_TYPES (oldtype
) == 0
1688 && TYPE_ARG_TYPES (newtype
) != 0
1689 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1693 /* Prototype decl follows defn w/o prototype. */
1695 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1696 type
= TYPE_ARG_TYPES (newtype
),
1699 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1701 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1702 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1704 warning_with_decl (newdecl
, "prototype for `%s' follows");
1705 warning_with_decl (olddecl
, "non-prototype definition here");
1708 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1709 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1711 error_with_decl (newdecl
,
1712 "prototype for `%s' follows and number of arguments doesn't match");
1713 error_with_decl (olddecl
, "non-prototype definition here");
1717 /* Type for passing arg must be consistent
1718 with that declared for the arg. */
1719 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1720 /* If -traditional, allow `unsigned int' instead of `int'
1721 in the prototype. */
1722 && (! (flag_traditional
1723 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1724 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1726 error_with_decl (newdecl
,
1727 "prototype for `%s' follows and argument %d doesn't match",
1729 error_with_decl (olddecl
, "non-prototype definition here");
1735 /* Warn about mismatches in various flags. */
1738 /* Warn if function is now inline
1739 but was previously declared not inline and has been called. */
1740 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1741 && ! DECL_DECLARED_INLINE_P (olddecl
)
1742 && DECL_DECLARED_INLINE_P (newdecl
)
1743 && TREE_USED (olddecl
))
1744 warning_with_decl (newdecl
,
1745 "`%s' declared inline after being called");
1746 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1747 && ! DECL_DECLARED_INLINE_P (olddecl
)
1748 && DECL_DECLARED_INLINE_P (newdecl
)
1749 && DECL_INITIAL (olddecl
) != 0)
1750 warning_with_decl (newdecl
,
1751 "`%s' declared inline after its definition");
1753 /* If pedantic, warn when static declaration follows a non-static
1754 declaration. Otherwise, do so only for functions. */
1755 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1756 && TREE_PUBLIC (olddecl
)
1757 && !TREE_PUBLIC (newdecl
))
1758 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1760 /* If warn_traditional, warn when a non-static function
1761 declaration follows a static one. */
1762 if (warn_traditional
&& !in_system_header
1763 && TREE_CODE (olddecl
) == FUNCTION_DECL
1764 && !TREE_PUBLIC (olddecl
)
1765 && TREE_PUBLIC (newdecl
))
1766 warning_with_decl (newdecl
, "non-static declaration for `%s' follows static");
1768 /* Warn when const declaration follows a non-const
1769 declaration, but not for functions. */
1770 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1771 && !TREE_READONLY (olddecl
)
1772 && TREE_READONLY (newdecl
))
1773 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1774 /* These bits are logically part of the type, for variables.
1775 But not for functions
1776 (where qualifiers are not valid ANSI anyway). */
1777 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1778 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1779 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1780 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1784 /* Optionally warn about more than one declaration for the same name. */
1785 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1786 /* Don't warn about a function declaration
1787 followed by a definition. */
1788 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1789 && DECL_INITIAL (olddecl
) == 0)
1790 /* Don't warn about extern decl followed by (tentative) definition. */
1791 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1793 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1794 warning_with_decl (olddecl
, "previous declaration of `%s'");
1797 /* Copy all the DECL_... slots specified in the new decl
1798 except for any that we copy here from the old type.
1800 Past this point, we don't change OLDTYPE and NEWTYPE
1801 even if we change the types of NEWDECL and OLDDECL. */
1805 /* When copying info to olddecl, we store into write_olddecl
1806 instead. This allows us to avoid modifying olddecl when
1807 different_binding_level is true. */
1808 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1810 /* Merge the data types specified in the two decls. */
1811 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1813 if (different_binding_level
)
1815 if (TYPE_ARG_TYPES (oldtype
) != 0
1816 && TYPE_ARG_TYPES (newtype
) == 0)
1817 TREE_TYPE (newdecl
) = common_type (newtype
, oldtype
);
1820 = build_type_attribute_variant
1822 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1823 TYPE_ATTRIBUTES (oldtype
)));
1827 = TREE_TYPE (olddecl
)
1828 = common_type (newtype
, oldtype
);
1831 /* Lay the type out, unless already done. */
1832 if (oldtype
!= TREE_TYPE (newdecl
))
1834 if (TREE_TYPE (newdecl
) != error_mark_node
)
1835 layout_type (TREE_TYPE (newdecl
));
1836 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1837 && TREE_CODE (newdecl
) != TYPE_DECL
1838 && TREE_CODE (newdecl
) != CONST_DECL
)
1839 layout_decl (newdecl
, 0);
1843 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1844 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1845 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1846 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1847 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1848 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1850 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1851 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1855 /* Keep the old rtl since we can safely use it. */
1856 COPY_DECL_RTL (olddecl
, newdecl
);
1858 /* Merge the type qualifiers. */
1859 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1860 && DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1861 && ! TREE_THIS_VOLATILE (newdecl
))
1862 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1864 if (TREE_READONLY (newdecl
))
1865 TREE_READONLY (write_olddecl
) = 1;
1867 if (TREE_THIS_VOLATILE (newdecl
))
1869 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1870 if (TREE_CODE (newdecl
) == VAR_DECL
1871 /* If an automatic variable is re-declared in the same
1872 function scope, but the old declaration was not
1873 volatile, make_var_volatile() would crash because the
1874 variable would have been assigned to a pseudo, not a
1875 MEM. Since this duplicate declaration is invalid
1876 anyway, we just skip the call. */
1878 make_var_volatile (newdecl
);
1881 /* Keep source location of definition rather than declaration. */
1882 /* When called with different_binding_level set, keep the old
1883 information so that meaningful diagnostics can be given. */
1884 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1885 && ! different_binding_level
)
1887 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1888 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1891 /* Merge the unused-warning information. */
1892 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1893 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1894 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1895 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1897 /* Merge the initialization information. */
1898 /* When called with different_binding_level set, don't copy over
1899 DECL_INITIAL, so that we don't accidentally change function
1900 declarations into function definitions. */
1901 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1902 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1904 /* Merge the section attribute.
1905 We want to issue an error if the sections conflict but that must be
1906 done later in decl_attributes since we are called before attributes
1908 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1909 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1911 /* Copy the assembler name.
1912 Currently, it can only be defined in the prototype. */
1913 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1915 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1917 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1918 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1919 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1920 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1921 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1924 /* If cannot merge, then use the new type and qualifiers,
1925 and don't preserve the old rtl. */
1926 else if (! different_binding_level
)
1928 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1929 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1930 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1931 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1934 /* Merge the storage class information. */
1935 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1936 /* For functions, static overrides non-static. */
1937 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1939 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1940 /* This is since we don't automatically
1941 copy the attributes of NEWDECL into OLDDECL. */
1942 /* No need to worry about different_binding_level here because
1943 then TREE_PUBLIC (newdecl) was true. */
1944 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1945 /* If this clears `static', clear it in the identifier too. */
1946 if (! TREE_PUBLIC (olddecl
))
1947 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1949 if (DECL_EXTERNAL (newdecl
))
1951 if (! different_binding_level
)
1953 /* Don't mess with these flags on local externs; they remain
1954 external even if there's a declaration at file scope which
1956 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1957 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1959 /* An extern decl does not override previous storage class. */
1960 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1961 if (! DECL_EXTERNAL (newdecl
))
1962 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1966 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1967 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1970 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1972 /* If we're redefining a function previously defined as extern
1973 inline, make sure we emit debug info for the inline before we
1974 throw it away, in case it was inlined into a function that hasn't
1975 been written out yet. */
1976 if (new_is_definition
&& DECL_INITIAL (olddecl
) && TREE_USED (olddecl
))
1978 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1980 /* The new defn must not be inline. */
1981 DECL_INLINE (newdecl
) = 0;
1982 DECL_UNINLINABLE (newdecl
) = 1;
1986 /* If either decl says `inline', this fn is inline,
1987 unless its definition was passed already. */
1988 if (DECL_DECLARED_INLINE_P (newdecl
)
1989 || DECL_DECLARED_INLINE_P (olddecl
))
1990 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1992 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1993 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1996 if (DECL_BUILT_IN (olddecl
))
1998 /* Get rid of any built-in function if new arg types don't match it
1999 or if we have a function definition. */
2000 if (! types_match
|| new_is_definition
)
2002 if (! different_binding_level
)
2004 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2005 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
2010 /* If redeclaring a builtin function, and not a definition,
2011 it stays built in. */
2012 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2013 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2017 /* Also preserve various other info from the definition. */
2018 if (! new_is_definition
)
2020 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2021 /* When called with different_binding_level set, don't copy over
2022 DECL_INITIAL, so that we don't accidentally change function
2023 declarations into function definitions. */
2024 if (! different_binding_level
)
2025 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2026 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
2027 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2028 DECL_NUM_STMTS (newdecl
) = DECL_NUM_STMTS (olddecl
);
2029 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2031 /* Set DECL_INLINE on the declaration if we've got a body
2032 from which to instantiate. */
2033 if (DECL_INLINE (olddecl
) && ! DECL_UNINLINABLE (newdecl
))
2035 DECL_INLINE (newdecl
) = 1;
2036 DECL_ABSTRACT_ORIGIN (newdecl
)
2037 = (different_binding_level
2038 ? DECL_ORIGIN (olddecl
)
2039 : DECL_ABSTRACT_ORIGIN (olddecl
));
2044 /* If a previous declaration said inline, mark the
2045 definition as inlinable. */
2046 if (DECL_DECLARED_INLINE_P (newdecl
)
2047 && ! DECL_UNINLINABLE (newdecl
))
2048 DECL_INLINE (newdecl
) = 1;
2051 if (different_binding_level
)
2054 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2055 But preserve OLDDECL's DECL_UID. */
2057 unsigned olddecl_uid
= DECL_UID (olddecl
);
2059 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2060 (char *) newdecl
+ sizeof (struct tree_common
),
2061 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
2062 DECL_UID (olddecl
) = olddecl_uid
;
2065 /* NEWDECL contains the merged attribute lists.
2066 Update OLDDECL to be the same. */
2067 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2072 /* Check whether decl-node X shadows an existing declaration.
2073 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
2074 which might be a NULL_TREE. */
2076 warn_if_shadowing (x
, oldlocal
)
2081 if (DECL_EXTERNAL (x
))
2084 name
= DECL_NAME (x
);
2086 /* Warn if shadowing an argument at the top level of the body. */
2088 /* This warning doesn't apply to the parms of a nested fcn. */
2089 && ! current_binding_level
->parm_flag
2090 /* Check that this is one level down from the parms. */
2091 && current_binding_level
->level_chain
->parm_flag
2092 /* Check that the decl being shadowed
2093 comes from the parm level, one level up. */
2094 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2096 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2097 pedwarn ("declaration of `%s' shadows a parameter",
2098 IDENTIFIER_POINTER (name
));
2100 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2101 IDENTIFIER_POINTER (name
));
2103 /* Maybe warn if shadowing something else. */
2104 else if (warn_shadow
2105 /* No shadow warnings for internally generated vars. */
2106 && DECL_SOURCE_LINE (x
) != 0
2107 /* No shadow warnings for vars made for inlining. */
2108 && ! DECL_FROM_INLINE (x
))
2110 if (TREE_CODE (x
) == PARM_DECL
2111 && current_binding_level
->level_chain
->parm_flag
)
2112 /* Don't warn about the parm names in function declarator
2113 within a function declarator.
2114 It would be nice to avoid warning in any function
2115 declarator in a declaration, as opposed to a definition,
2116 but there is no way to tell it's not a definition. */
2120 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2121 shadow_warning ("a parameter", name
, oldlocal
);
2123 shadow_warning ("a previous local", name
, oldlocal
);
2125 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2126 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2127 shadow_warning ("a global declaration", name
,
2128 IDENTIFIER_GLOBAL_VALUE (name
));
2132 /* Record a decl-node X as belonging to the current lexical scope.
2133 Check for errors (such as an incompatible declaration for the same
2134 name already seen in the same scope).
2136 Returns either X or an old decl for the same name.
2137 If an old decl is returned, it may have been smashed
2138 to agree with what X says. */
2145 tree name
= DECL_NAME (x
);
2146 struct binding_level
*b
= current_binding_level
;
2148 /* Functions need the lang_decl data. */
2149 if (TREE_CODE (x
) == FUNCTION_DECL
&& ! DECL_LANG_SPECIFIC (x
))
2150 DECL_LANG_SPECIFIC (x
) = (struct lang_decl
*)
2151 ggc_alloc_cleared (sizeof (struct lang_decl
));
2153 DECL_CONTEXT (x
) = current_function_decl
;
2154 /* A local extern declaration for a function doesn't constitute nesting.
2155 A local auto declaration does, since it's a forward decl
2156 for a nested function coming later. */
2157 if ((TREE_CODE (x
) == FUNCTION_DECL
|| TREE_CODE (x
) == VAR_DECL
)
2158 && DECL_INITIAL (x
) == 0 && DECL_EXTERNAL (x
))
2159 DECL_CONTEXT (x
) = 0;
2163 int different_binding_level
= 0;
2165 if (warn_nested_externs
2166 && DECL_EXTERNAL (x
)
2167 && b
!= global_binding_level
2168 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2169 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2170 && !DECL_IN_SYSTEM_HEADER (x
))
2171 warning ("nested extern declaration of `%s'",
2172 IDENTIFIER_POINTER (name
));
2174 t
= lookup_name_current_level (name
);
2175 /* Don't type check externs here when -traditional. This is so that
2176 code with conflicting declarations inside blocks will get warnings
2177 not errors. X11 for instance depends on this. */
2178 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2180 t
= lookup_name (name
);
2181 /* Type decls at global scope don't conflict with externs declared
2182 inside lexical blocks. */
2183 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2185 different_binding_level
= 1;
2187 if (t
!= 0 && t
== error_mark_node
)
2188 /* error_mark_node is 0 for a while during initialization! */
2191 error_with_decl (x
, "`%s' used prior to declaration");
2194 /* If this decl is `static' and an implicit decl was seen previously,
2195 warn. But don't complain if -traditional,
2196 since traditional compilers don't complain. */
2197 if (! flag_traditional
&& TREE_PUBLIC (name
)
2198 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2199 sets this for all functions. */
2200 && ! TREE_PUBLIC (x
)
2201 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2202 /* We used to warn also for explicit extern followed by static,
2203 but sometimes you need to do it that way. */
2204 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2206 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2207 IDENTIFIER_POINTER (name
));
2208 pedwarn_with_file_and_line
2209 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2210 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2211 "previous declaration of `%s'",
2212 IDENTIFIER_POINTER (name
));
2213 TREE_THIS_VOLATILE (name
) = 1;
2216 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2218 if (TREE_CODE (t
) == PARM_DECL
)
2220 /* Don't allow more than one "real" duplicate
2221 of a forward parm decl. */
2222 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2228 /* If we are processing a typedef statement, generate a whole new
2229 ..._TYPE node (which will be just an variant of the existing
2230 ..._TYPE node with identical properties) and then install the
2231 TYPE_DECL node generated to represent the typedef name as the
2232 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2234 The whole point here is to end up with a situation where each
2235 and every ..._TYPE node the compiler creates will be uniquely
2236 associated with AT MOST one node representing a typedef name.
2237 This way, even though the compiler substitutes corresponding
2238 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2239 early on, later parts of the compiler can always do the reverse
2240 translation and get back the corresponding typedef name. For
2243 typedef struct S MY_TYPE;
2246 Later parts of the compiler might only know that `object' was of
2247 type `struct S' if it were not for code just below. With this
2248 code however, later parts of the compiler see something like:
2250 struct S' == struct S
2251 typedef struct S' MY_TYPE;
2254 And they can then deduce (from the node for type struct S') that
2255 the original object declaration was:
2259 Being able to do this is important for proper support of protoize,
2260 and also for generating precise symbolic debugging information
2261 which takes full account of the programmer's (typedef) vocabulary.
2263 Obviously, we don't want to generate a duplicate ..._TYPE node if
2264 the TYPE_DECL node that we are now processing really represents a
2265 standard built-in type.
2267 Since all standard types are effectively declared at line zero
2268 in the source file, we can easily check to see if we are working
2269 on a standard type by checking the current value of lineno. */
2271 if (TREE_CODE (x
) == TYPE_DECL
)
2273 if (DECL_SOURCE_LINE (x
) == 0)
2275 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2276 TYPE_NAME (TREE_TYPE (x
)) = x
;
2278 else if (TREE_TYPE (x
) != error_mark_node
2279 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2281 tree tt
= TREE_TYPE (x
);
2282 DECL_ORIGINAL_TYPE (x
) = tt
;
2283 tt
= build_type_copy (tt
);
2285 TREE_USED (tt
) = TREE_USED (x
);
2290 /* Multiple external decls of the same identifier ought to match.
2291 Check against both global declarations (when traditional) and out of
2292 scope (limbo) block level declarations.
2294 We get warnings about inline functions where they are defined.
2295 Avoid duplicate warnings where they are used. */
2297 && ! (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INLINE (x
)))
2301 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2302 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2303 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2304 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2305 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2306 /* Decls in limbo are always extern, so no need to check that. */
2307 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2311 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2312 /* If old decl is built-in, we already warned if we should. */
2313 && !DECL_BUILT_IN (decl
))
2315 pedwarn_with_decl (x
,
2316 "type mismatch with previous external decl");
2317 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2321 /* If a function has had an implicit declaration, and then is defined,
2322 make sure they are compatible. */
2324 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2325 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2326 && TREE_CODE (x
) == FUNCTION_DECL
2327 && ! comptypes (TREE_TYPE (x
),
2328 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2330 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2331 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2332 "previous implicit declaration of `%s'");
2335 /* In PCC-compatibility mode, extern decls of vars with no current decl
2336 take effect at top level no matter where they are. */
2337 if (flag_traditional
&& DECL_EXTERNAL (x
)
2338 && lookup_name (name
) == 0)
2340 tree type
= TREE_TYPE (x
);
2342 /* But don't do this if the type contains temporary nodes. */
2345 if (type
== error_mark_node
)
2347 if (TYPE_CONTEXT (type
))
2349 warning_with_decl (x
, "type of external `%s' is not global");
2350 /* By exiting the loop early, we leave TYPE nonzero,
2351 and thus prevent globalization of the decl. */
2354 else if (TREE_CODE (type
) == FUNCTION_TYPE
2355 && TYPE_ARG_TYPES (type
) != 0)
2356 /* The types might not be truly local,
2357 but the list of arg types certainly is temporary.
2358 Since prototypes are nontraditional,
2359 ok not to do the traditional thing. */
2361 type
= TREE_TYPE (type
);
2365 b
= global_binding_level
;
2368 /* This name is new in its binding level.
2369 Install the new declaration and return it. */
2370 if (b
== global_binding_level
)
2372 /* Install a global value. */
2374 /* If the first global decl has external linkage,
2375 warn if we later see static one. */
2376 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2377 TREE_PUBLIC (name
) = 1;
2379 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2381 /* We no longer care about any previous block level declarations. */
2382 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2384 /* Don't forget if the function was used via an implicit decl. */
2385 if (IDENTIFIER_IMPLICIT_DECL (name
)
2386 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2387 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2389 /* Don't forget if its address was taken in that way. */
2390 if (IDENTIFIER_IMPLICIT_DECL (name
)
2391 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2392 TREE_ADDRESSABLE (x
) = 1;
2394 /* Warn about mismatches against previous implicit decl. */
2395 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2396 /* If this real decl matches the implicit, don't complain. */
2397 && ! (TREE_CODE (x
) == FUNCTION_DECL
2398 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2399 == integer_type_node
)))
2400 pedwarn ("`%s' was previously implicitly declared to return `int'",
2401 IDENTIFIER_POINTER (name
));
2403 /* If this decl is `static' and an `extern' was seen previously,
2404 that is erroneous. */
2405 if (TREE_PUBLIC (name
)
2406 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2408 /* Okay to redeclare an ANSI built-in as static. */
2409 if (t
!= 0 && DECL_BUILT_IN (t
))
2411 /* Okay to declare a non-ANSI built-in as anything. */
2412 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2414 /* Okay to have global type decl after an earlier extern
2415 declaration inside a lexical block. */
2416 else if (TREE_CODE (x
) == TYPE_DECL
)
2418 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2420 if (! TREE_THIS_VOLATILE (name
))
2421 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2422 IDENTIFIER_POINTER (name
));
2425 pedwarn ("`%s' was declared `extern' and later `static'",
2426 IDENTIFIER_POINTER (name
));
2431 /* Here to install a non-global value. */
2432 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2433 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2435 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2437 /* If this is an extern function declaration, see if we
2438 have a global definition or declaration for the function. */
2441 && TREE_CODE (x
) == FUNCTION_DECL
2442 && TREE_CODE (oldglobal
) == FUNCTION_DECL
2443 && DECL_EXTERNAL (x
)
2444 && ! DECL_DECLARED_INLINE_P (x
))
2446 /* We have one. Their types must agree. */
2447 if (! comptypes (TREE_TYPE (x
),
2448 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2449 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2452 /* Inner extern decl is inline if global one is.
2453 Copy enough to really inline it. */
2454 if (DECL_DECLARED_INLINE_P (oldglobal
))
2456 DECL_DECLARED_INLINE_P (x
)
2457 = DECL_DECLARED_INLINE_P (oldglobal
);
2458 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2459 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2460 ? 0 : DECL_INITIAL (oldglobal
));
2461 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2462 DECL_NUM_STMTS (x
) = DECL_NUM_STMTS (oldglobal
);
2463 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2464 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2465 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2466 DECL_ABSTRACT_ORIGIN (x
)
2467 = DECL_ABSTRACT_ORIGIN (oldglobal
);
2469 /* Inner extern decl is built-in if global one is. */
2470 if (DECL_BUILT_IN (oldglobal
))
2472 DECL_BUILT_IN_CLASS (x
) = DECL_BUILT_IN_CLASS (oldglobal
);
2473 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2475 /* Keep the arg types from a file-scope fcn defn. */
2476 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2477 && DECL_INITIAL (oldglobal
)
2478 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2479 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2484 /* This case is probably sometimes the right thing to do. */
2485 /* If we have a local external declaration,
2486 then any file-scope declaration should not
2487 have been static. */
2488 if (oldlocal
== 0 && oldglobal
!= 0
2489 && !TREE_PUBLIC (oldglobal
)
2490 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2491 warning ("`%s' locally external but globally static",
2492 IDENTIFIER_POINTER (name
));
2495 /* If we have a local external declaration,
2496 and no file-scope declaration has yet been seen,
2497 then if we later have a file-scope decl it must not be static. */
2499 && DECL_EXTERNAL (x
)
2503 TREE_PUBLIC (name
) = 1;
2505 /* Save this decl, so that we can do type checking against
2506 other decls after it falls out of scope.
2508 Only save it once. This prevents temporary decls created in
2509 expand_inline_function from being used here, since this
2510 will have been set when the inline function was parsed.
2511 It also helps give slightly better warnings. */
2512 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2513 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2516 warn_if_shadowing (x
, oldlocal
);
2518 /* If storing a local value, there may already be one (inherited).
2519 If so, record it for restoration when this binding level ends. */
2521 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2524 /* Keep count of variables in this level with incomplete type.
2525 If the input is erroneous, we can have error_mark in the type
2526 slot (e.g. "f(void a, ...)") - that doesn't count as an
2528 if (TREE_TYPE (x
) != error_mark_node
2529 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2531 tree element
= TREE_TYPE (x
);
2533 while (TREE_CODE (element
) == ARRAY_TYPE
)
2534 element
= TREE_TYPE (element
);
2535 if (TREE_CODE (element
) == RECORD_TYPE
2536 || TREE_CODE (element
) == UNION_TYPE
)
2541 /* Put decls on list in reverse order.
2542 We will reverse them later if necessary. */
2543 TREE_CHAIN (x
) = b
->names
;
2549 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2552 pushdecl_top_level (x
)
2556 struct binding_level
*b
= current_binding_level
;
2558 current_binding_level
= global_binding_level
;
2560 current_binding_level
= b
;
2564 /* Generate an implicit declaration for identifier FUNCTIONID
2565 as a function of type int (). Print a warning if appropriate. */
2568 implicitly_declare (functionid
)
2572 int traditional_warning
= 0;
2573 /* Only one "implicit declaration" warning per identifier. */
2574 int implicit_warning
;
2576 /* We used to reuse an old implicit decl here,
2577 but this loses with inline functions because it can clobber
2578 the saved decl chains. */
2580 if (IDENTIFIER_IMPLICIT_DECL (functionid
) != 0)
2581 decl
= IDENTIFIER_IMPLICIT_DECL (functionid
);
2584 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2586 /* Warn of implicit decl following explicit local extern decl.
2587 This is probably a program designed for traditional C. */
2588 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2589 traditional_warning
= 1;
2591 /* Warn once of an implicit declaration. */
2592 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2594 DECL_EXTERNAL (decl
) = 1;
2595 TREE_PUBLIC (decl
) = 1;
2597 /* Record that we have an implicit decl and this is it. */
2598 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2600 /* ANSI standard says implicit declarations are in the innermost block.
2601 So we record the decl in the standard fashion.
2602 If flag_traditional is set, pushdecl does it top-level. */
2605 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2606 maybe_objc_check_decl (decl
);
2608 rest_of_decl_compilation (decl
, NULL
, 0, 0);
2610 if (implicit_warning
)
2611 implicit_decl_warning (functionid
);
2612 else if (warn_traditional
&& traditional_warning
)
2613 warning ("function `%s' was previously declared within a block",
2614 IDENTIFIER_POINTER (functionid
));
2616 /* Write a record describing this implicit function declaration to the
2617 prototypes file (if requested). */
2619 gen_aux_info_record (decl
, 0, 1, 0);
2621 /* Possibly apply some default attributes to this implicit declaration. */
2622 decl_attributes (&decl
, NULL_TREE
, 0);
2628 implicit_decl_warning (id
)
2631 const char *name
= IDENTIFIER_POINTER (id
);
2632 if (mesg_implicit_function_declaration
== 2)
2633 error ("implicit declaration of function `%s'", name
);
2634 else if (mesg_implicit_function_declaration
== 1)
2635 warning ("implicit declaration of function `%s'", name
);
2638 /* Return zero if the declaration NEWDECL is valid
2639 when the declaration OLDDECL (assumed to be for the same name)
2640 has already been seen.
2641 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2642 and 3 if it is a conflicting declaration. */
2645 redeclaration_error_message (newdecl
, olddecl
)
2646 tree newdecl
, olddecl
;
2648 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2650 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2652 /* pushdecl creates distinct types for TYPE_DECLs by calling
2653 build_type_copy, so the above comparison generally fails. We do
2654 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2655 is equivalent to what this code used to do before the build_type_copy
2656 call. The variant type distinction should not matter for traditional
2657 code, because it doesn't have type qualifiers. */
2658 if (flag_traditional
2659 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2661 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2665 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2667 /* Declarations of functions can insist on internal linkage
2668 but they can't be inconsistent with internal linkage,
2669 so there can be no error on that account.
2670 However defining the same name twice is no good. */
2671 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2672 /* However, defining once as extern inline and a second
2673 time in another way is ok. */
2674 && ! (DECL_DECLARED_INLINE_P (olddecl
) && DECL_EXTERNAL (olddecl
)
2675 && ! (DECL_DECLARED_INLINE_P (newdecl
)
2676 && DECL_EXTERNAL (newdecl
))))
2680 else if (DECL_CONTEXT (newdecl
) == NULL_TREE
)
2682 /* Objects declared at top level: */
2683 /* If at least one is a reference, it's ok. */
2684 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2686 /* Reject two definitions. */
2687 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2689 /* Now we have two tentative defs, or one tentative and one real def. */
2690 /* Insist that the linkage match. */
2691 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2695 else if (current_binding_level
->parm_flag
2696 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2700 /* Newdecl has block scope. If olddecl has block scope also, then
2701 reject two definitions, and reject a definition together with an
2702 external reference. Otherwise, it is OK, because newdecl must
2703 be an extern reference to olddecl. */
2704 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2705 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2711 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2712 Create one if none exists so far for the current function.
2713 This function is called for both label definitions and label references. */
2719 tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2721 if (current_function_decl
== 0)
2723 error ("label %s referenced outside of any function",
2724 IDENTIFIER_POINTER (id
));
2728 /* Use a label already defined or ref'd with this name. */
2731 /* But not if it is inherited and wasn't declared to be inheritable. */
2732 if (DECL_CONTEXT (decl
) != current_function_decl
2733 && ! C_DECLARED_LABEL_FLAG (decl
))
2734 return shadow_label (id
);
2738 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2740 /* A label not explicitly declared must be local to where it's ref'd. */
2741 DECL_CONTEXT (decl
) = current_function_decl
;
2743 DECL_MODE (decl
) = VOIDmode
;
2745 /* Say where one reference is to the label,
2746 for the sake of the error if it is not defined. */
2747 DECL_SOURCE_LINE (decl
) = lineno
;
2748 DECL_SOURCE_FILE (decl
) = input_filename
;
2750 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2752 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2757 /* Make a label named NAME in the current function,
2758 shadowing silently any that may be inherited from containing functions
2759 or containing scopes.
2761 Note that valid use, if the label being shadowed
2762 comes from another scope in the same function,
2763 requires calling declare_nonlocal_label right away. */
2769 tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2775 /* Check to make sure that the label hasn't already been declared
2776 at this label scope */
2777 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2778 if (TREE_VALUE (dup
) == decl
)
2780 error ("duplicate label declaration `%s'",
2781 IDENTIFIER_POINTER (name
));
2782 error_with_decl (TREE_VALUE (dup
),
2783 "this is a previous declaration");
2784 /* Just use the previous declaration. */
2785 return lookup_label (name
);
2788 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2789 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2792 return lookup_label (name
);
2795 /* Define a label, specifying the location in the source file.
2796 Return the LABEL_DECL node for the label, if the definition is valid.
2797 Otherwise return 0. */
2800 define_label (filename
, line
, name
)
2801 const char *filename
;
2805 tree decl
= lookup_label (name
);
2807 /* If label with this name is known from an outer context, shadow it. */
2808 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2810 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2811 IDENTIFIER_LABEL_VALUE (name
) = 0;
2812 decl
= lookup_label (name
);
2815 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2816 warning_with_file_and_line (filename
, line
,
2817 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2818 IDENTIFIER_POINTER (name
));
2820 if (DECL_INITIAL (decl
) != 0)
2822 error_with_file_and_line (filename
, line
, "duplicate label `%s'",
2823 IDENTIFIER_POINTER (name
));
2828 /* Mark label as having been defined. */
2829 DECL_INITIAL (decl
) = error_mark_node
;
2830 /* Say where in the source. */
2831 DECL_SOURCE_FILE (decl
) = filename
;
2832 DECL_SOURCE_LINE (decl
) = line
;
2837 /* Return the list of declarations of the current level.
2838 Note that this list is in reverse order unless/until
2839 you nreverse it; and when you do nreverse it, you must
2840 store the result back using `storedecls' or you will lose. */
2845 return current_binding_level
->names
;
2848 /* Return the list of type-tags (for structs, etc) of the current level. */
2853 return current_binding_level
->tags
;
2856 /* Store the list of declarations of the current level.
2857 This is done for the parameter declarations of a function being defined,
2858 after they are modified in the light of any missing parameters. */
2864 current_binding_level
->names
= decls
;
2867 /* Similarly, store the list of tags of the current level. */
2873 current_binding_level
->tags
= tags
;
2876 /* Given NAME, an IDENTIFIER_NODE,
2877 return the structure (or union or enum) definition for that name.
2878 Searches binding levels from BINDING_LEVEL up to the global level.
2879 If THISLEVEL_ONLY is nonzero, searches only the specified context
2880 (but skips any tag-transparent contexts to find one that is
2881 meaningful for tags).
2882 CODE says which kind of type the caller wants;
2883 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2884 If the wrong kind of type is found, an error is reported. */
2887 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2888 enum tree_code code
;
2889 struct binding_level
*binding_level
;
2893 struct binding_level
*level
;
2896 for (level
= binding_level
; level
; level
= level
->level_chain
)
2899 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2901 if (TREE_PURPOSE (tail
) == name
)
2903 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2905 /* Definition isn't the kind we were looking for. */
2906 pending_invalid_xref
= name
;
2907 pending_invalid_xref_file
= input_filename
;
2908 pending_invalid_xref_line
= lineno
;
2909 /* If in the same binding level as a declaration as a tag
2910 of a different type, this must not be allowed to
2911 shadow that tag, so give the error immediately.
2912 (For example, "struct foo; union foo;" is invalid.) */
2914 pending_xref_error ();
2916 return TREE_VALUE (tail
);
2919 if (! level
->tag_transparent
)
2929 /* Print an error message now
2930 for a recent invalid struct, union or enum cross reference.
2931 We don't print them immediately because they are not invalid
2932 when used in the `struct foo;' construct for shadowing. */
2935 pending_xref_error ()
2937 if (pending_invalid_xref
!= 0)
2938 error_with_file_and_line (pending_invalid_xref_file
,
2939 pending_invalid_xref_line
,
2940 "`%s' defined as wrong kind of tag",
2941 IDENTIFIER_POINTER (pending_invalid_xref
));
2942 pending_invalid_xref
= 0;
2945 /* Given a type, find the tag that was defined for it and return the tag name.
2946 Otherwise return 0. */
2949 lookup_tag_reverse (type
)
2952 struct binding_level
*level
;
2954 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2957 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2959 if (TREE_VALUE (tail
) == type
)
2960 return TREE_PURPOSE (tail
);
2966 /* Look up NAME in the current binding level and its superiors
2967 in the namespace of variables, functions and typedefs.
2968 Return a ..._DECL node of some kind representing its definition,
2969 or return 0 if it is undefined. */
2977 if (current_binding_level
!= global_binding_level
2978 && IDENTIFIER_LOCAL_VALUE (name
))
2979 val
= IDENTIFIER_LOCAL_VALUE (name
);
2981 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2985 /* Similar to `lookup_name' but look only at current binding level. */
2988 lookup_name_current_level (name
)
2993 if (current_binding_level
== global_binding_level
)
2994 return IDENTIFIER_GLOBAL_VALUE (name
);
2996 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2999 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
3000 if (DECL_NAME (t
) == name
)
3006 /* Mark ARG for GC. */
3009 mark_binding_level (arg
)
3012 struct binding_level
*level
= *(struct binding_level
**) arg
;
3014 for (; level
!= 0; level
= level
->level_chain
)
3016 ggc_mark_tree (level
->names
);
3017 ggc_mark_tree (level
->tags
);
3018 ggc_mark_tree (level
->shadowed
);
3019 ggc_mark_tree (level
->blocks
);
3020 ggc_mark_tree (level
->this_block
);
3021 ggc_mark_tree (level
->parm_order
);
3025 /* Create the predefined scalar types of C,
3026 and some nodes representing standard constants (0, 1, (void *) 0).
3027 Initialize the global binding level.
3028 Make definitions for built-in primitive functions. */
3031 c_init_decl_processing ()
3034 tree ptr_ftype_void
, ptr_ftype_ptr
;
3036 /* Adds some ggc roots, and reserved words for c-parse.in. */
3039 current_function_decl
= NULL
;
3040 named_labels
= NULL
;
3041 current_binding_level
= NULL_BINDING_LEVEL
;
3042 free_binding_level
= NULL_BINDING_LEVEL
;
3044 /* Make the binding_level structure for global names. */
3046 global_binding_level
= current_binding_level
;
3048 build_common_tree_nodes (flag_signed_char
);
3050 c_common_nodes_and_builtins ();
3052 boolean_type_node
= integer_type_node
;
3053 boolean_true_node
= integer_one_node
;
3054 boolean_false_node
= integer_zero_node
;
3056 /* With GCC, C99's _Bool is always of size 1. */
3057 c_bool_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
3058 TREE_SET_CODE (c_bool_type_node
, BOOLEAN_TYPE
);
3059 TYPE_MAX_VALUE (c_bool_type_node
) = build_int_2 (1, 0);
3060 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node
)) = c_bool_type_node
;
3061 TYPE_PRECISION (c_bool_type_node
) = 1;
3062 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
3064 c_bool_false_node
= build_int_2 (0, 0);
3065 TREE_TYPE (c_bool_false_node
) = c_bool_type_node
;
3066 c_bool_true_node
= build_int_2 (1, 0);
3067 TREE_TYPE (c_bool_true_node
) = c_bool_type_node
;
3069 endlink
= void_list_node
;
3070 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3072 = build_function_type (ptr_type_node
,
3073 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3075 /* Types which are common to the fortran compiler and libf2c. When
3076 changing these, you also need to be concerned with f/com.h. */
3078 if (TYPE_PRECISION (float_type_node
)
3079 == TYPE_PRECISION (long_integer_type_node
))
3081 g77_integer_type_node
= long_integer_type_node
;
3082 g77_uinteger_type_node
= long_unsigned_type_node
;
3084 else if (TYPE_PRECISION (float_type_node
)
3085 == TYPE_PRECISION (integer_type_node
))
3087 g77_integer_type_node
= integer_type_node
;
3088 g77_uinteger_type_node
= unsigned_type_node
;
3091 g77_integer_type_node
= g77_uinteger_type_node
= NULL_TREE
;
3093 if (g77_integer_type_node
!= NULL_TREE
)
3095 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_integer"),
3096 g77_integer_type_node
));
3097 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_uinteger"),
3098 g77_uinteger_type_node
));
3101 if (TYPE_PRECISION (float_type_node
) * 2
3102 == TYPE_PRECISION (long_integer_type_node
))
3104 g77_longint_type_node
= long_integer_type_node
;
3105 g77_ulongint_type_node
= long_unsigned_type_node
;
3107 else if (TYPE_PRECISION (float_type_node
) * 2
3108 == TYPE_PRECISION (long_long_integer_type_node
))
3110 g77_longint_type_node
= long_long_integer_type_node
;
3111 g77_ulongint_type_node
= long_long_unsigned_type_node
;
3114 g77_longint_type_node
= g77_ulongint_type_node
= NULL_TREE
;
3116 if (g77_longint_type_node
!= NULL_TREE
)
3118 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_longint"),
3119 g77_longint_type_node
));
3120 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_ulongint"),
3121 g77_ulongint_type_node
));
3124 pedantic_lvalues
= pedantic
;
3126 make_fname_decl
= c_make_fname_decl
;
3127 start_fname_decls ();
3129 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3131 /* Record our roots. */
3133 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3134 ggc_add_root (&c_stmt_tree
, 1, sizeof c_stmt_tree
, mark_stmt_tree
);
3135 ggc_add_tree_root (&c_scope_stmt_stack
, 1);
3136 ggc_add_tree_root (&named_labels
, 1);
3137 ggc_add_tree_root (&shadowed_labels
, 1);
3138 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3139 mark_binding_level
);
3140 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3141 mark_binding_level
);
3142 ggc_add_tree_root (&static_ctors
, 1);
3143 ggc_add_tree_root (&static_dtors
, 1);
3146 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3147 decl, NAME is the initialization string and TYPE_DEP indicates whether
3148 NAME depended on the type of the function. As we don't yet implement
3149 delayed emission of static data, we mark the decl as emitted
3150 so it is not placed in the output. Anything using it must therefore pull
3151 out the STRING_CST initializer directly. This does mean that these names
3152 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3155 c_make_fname_decl (id
, type_dep
)
3159 const char *name
= fname_as_string (type_dep
);
3160 tree decl
, type
, init
;
3161 size_t length
= strlen (name
);
3163 type
= build_array_type
3164 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
3165 build_index_type (size_int (length
)));
3167 decl
= build_decl (VAR_DECL
, id
, type
);
3168 /* We don't push the decl, so have to set its context here. */
3169 DECL_CONTEXT (decl
) = current_function_decl
;
3171 TREE_STATIC (decl
) = 1;
3172 TREE_READONLY (decl
) = 1;
3173 DECL_ARTIFICIAL (decl
) = 1;
3175 init
= build_string (length
+ 1, name
);
3176 TREE_TYPE (init
) = type
;
3177 DECL_INITIAL (decl
) = init
;
3179 TREE_USED (decl
) = 1;
3181 finish_decl (decl
, init
, NULL_TREE
);
3186 /* Return a definition for a builtin function named NAME and whose data type
3187 is TYPE. TYPE should be a function type with argument types.
3188 FUNCTION_CODE tells later passes how to compile calls to this function.
3189 See tree.h for its possible values.
3191 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3192 the name to be called if we can't opencode the function. */
3195 builtin_function (name
, type
, function_code
, class, library_name
)
3199 enum built_in_class
class;
3200 const char *library_name
;
3202 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3203 DECL_EXTERNAL (decl
) = 1;
3204 TREE_PUBLIC (decl
) = 1;
3205 /* If -traditional, permit redefining a builtin function any way you like.
3206 (Though really, if the program redefines these functions,
3207 it probably won't work right unless compiled with -fno-builtin.) */
3208 if (flag_traditional
&& name
[0] != '_')
3209 DECL_BUILT_IN_NONANSI (decl
) = 1;
3211 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
3212 make_decl_rtl (decl
, NULL
);
3214 DECL_BUILT_IN_CLASS (decl
) = class;
3215 DECL_FUNCTION_CODE (decl
) = function_code
;
3217 /* Warn if a function in the namespace for users
3218 is used without an occasion to consider it declared. */
3219 if (name
[0] != '_' || name
[1] != '_')
3220 C_DECL_ANTICIPATED (decl
) = 1;
3222 /* Possibly apply some default attributes to this built-in function. */
3223 decl_attributes (&decl
, NULL_TREE
, 0);
3228 /* Apply default attributes to a function, if a system function with default
3232 insert_default_attributes (decl
)
3235 if (!TREE_PUBLIC (decl
))
3237 c_common_insert_default_attributes (decl
);
3240 /* Called when a declaration is seen that contains no names to declare.
3241 If its type is a reference to a structure, union or enum inherited
3242 from a containing scope, shadow that tag name for the current scope
3243 with a forward reference.
3244 If its type defines a new named structure or union
3245 or defines an enum, it is valid but we need not do anything here.
3246 Otherwise, it is an error. */
3249 shadow_tag (declspecs
)
3252 shadow_tag_warned (declspecs
, 0);
3256 shadow_tag_warned (declspecs
, warned
)
3259 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3266 pending_invalid_xref
= 0;
3268 /* Remove the attributes from declspecs, since they will confuse the
3270 split_specs_attrs (declspecs
, &specs
, &attrs
);
3272 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3274 tree value
= TREE_VALUE (link
);
3275 enum tree_code code
= TREE_CODE (value
);
3277 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3278 /* Used to test also that TYPE_SIZE (value) != 0.
3279 That caused warning for `struct foo;' at top level in the file. */
3281 tree name
= lookup_tag_reverse (value
);
3288 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3289 /* Empty unnamed enum OK */
3291 pedwarn ("unnamed struct/union that defines no instances");
3297 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3301 t
= make_node (code
);
3308 if (!warned
&& ! in_system_header
)
3310 warning ("useless keyword or type name in empty declaration");
3317 error ("two types specified in one empty declaration");
3322 pedwarn ("empty declaration");
3326 /* Construct an array declarator. EXPR is the expression inside [], or
3327 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3328 to the pointer to which a parameter array is converted). STATIC_P is
3329 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3330 is non-zero is the array is [*], a VLA of unspecified length which is
3331 nevertheless a complete type (not currently implemented by GCC),
3332 zero otherwise. The declarator is constructed as an ARRAY_REF
3333 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3334 left of the [] (filled by in set_array_declarator_type) and operand 1
3335 is the expression inside; whose TREE_TYPE is the type qualifiers and
3336 which has TREE_STATIC set if "static" is used. */
3339 build_array_declarator (expr
, quals
, static_p
, vla_unspec_p
)
3346 decl
= build_nt (ARRAY_REF
, NULL_TREE
, expr
);
3347 TREE_TYPE (decl
) = quals
;
3348 TREE_STATIC (decl
) = (static_p
? 1 : 0);
3349 if (pedantic
&& !flag_isoc99
)
3351 if (static_p
|| quals
!= NULL_TREE
)
3352 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3354 pedwarn ("ISO C89 does not support `[*]' array declarators");
3357 warning ("GCC does not yet properly implement `[*]' array declarators");
3361 /* Set the type of an array declarator. DECL is the declarator, as
3362 constructed by build_array_declarator; TYPE is what appears on the left
3363 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3364 abstract declarator, zero otherwise; this is used to reject static and
3365 type qualifiers in abstract declarators, where they are not in the
3369 set_array_declarator_type (decl
, type
, abstract_p
)
3374 TREE_OPERAND (decl
, 0) = type
;
3375 if (abstract_p
&& (TREE_TYPE (decl
) != NULL_TREE
|| TREE_STATIC (decl
)))
3376 error ("static or type qualifiers in abstract declarator");
3380 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3383 groktypename (typename
)
3388 if (TREE_CODE (typename
) != TREE_LIST
)
3391 split_specs_attrs (TREE_PURPOSE (typename
), &specs
, &attrs
);
3393 typename
= grokdeclarator (TREE_VALUE (typename
), specs
, TYPENAME
, 0);
3395 /* Apply attributes. */
3396 decl_attributes (&typename
, attrs
, 0);
3401 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3404 groktypename_in_parm_context (typename
)
3407 if (TREE_CODE (typename
) != TREE_LIST
)
3409 return grokdeclarator (TREE_VALUE (typename
),
3410 TREE_PURPOSE (typename
),
3414 /* Decode a declarator in an ordinary declaration or data definition.
3415 This is called as soon as the type information and variable name
3416 have been parsed, before parsing the initializer if any.
3417 Here we create the ..._DECL node, fill in its type,
3418 and put it on the list of decls for the current context.
3419 The ..._DECL node is returned as the value.
3421 Exception: for arrays where the length is not specified,
3422 the type is left null, to be filled in by `finish_decl'.
3424 Function definitions do not come here; they go to start_function
3425 instead. However, external and forward declarations of functions
3426 do go through here. Structure field declarations are done by
3427 grokfield and not through here. */
3430 start_decl (declarator
, declspecs
, initialized
, attributes
)
3431 tree declarator
, declspecs
;
3438 /* An object declared as __attribute__((deprecated)) suppresses
3439 warnings of uses of other deprecated items. */
3440 if (lookup_attribute ("deprecated", attributes
))
3441 deprecated_state
= DEPRECATED_SUPPRESS
;
3443 decl
= grokdeclarator (declarator
, declspecs
,
3444 NORMAL
, initialized
);
3446 deprecated_state
= DEPRECATED_NORMAL
;
3448 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3449 && MAIN_NAME_P (DECL_NAME (decl
)))
3450 warning_with_decl (decl
, "`%s' is usually a function");
3453 /* Is it valid for this decl to have an initializer at all?
3454 If not, set INITIALIZED to zero, which will indirectly
3455 tell `finish_decl' to ignore the initializer once it is parsed. */
3456 switch (TREE_CODE (decl
))
3459 /* typedef foo = bar means give foo the same type as bar.
3460 We haven't parsed bar yet, so `finish_decl' will fix that up.
3461 Any other case of an initialization in a TYPE_DECL is an error. */
3462 if (pedantic
|| list_length (declspecs
) > 1)
3464 error ("typedef `%s' is initialized",
3465 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3471 error ("function `%s' is initialized like a variable",
3472 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3477 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3478 error ("parameter `%s' is initialized",
3479 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3484 /* Don't allow initializations for incomplete types
3485 except for arrays which might be completed by the initialization. */
3487 /* This can happen if the array size is an undefined macro. We already
3488 gave a warning, so we don't need another one. */
3489 if (TREE_TYPE (decl
) == error_mark_node
)
3491 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3493 /* A complete type is ok if size is fixed. */
3495 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3496 || C_DECL_VARIABLE_SIZE (decl
))
3498 error ("variable-sized object may not be initialized");
3502 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3504 error ("variable `%s' has initializer but incomplete type",
3505 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3508 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
3510 error ("elements of array `%s' have incomplete type",
3511 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3519 /* Seems redundant with grokdeclarator. */
3520 if (current_binding_level
!= global_binding_level
3521 && DECL_EXTERNAL (decl
)
3522 && TREE_CODE (decl
) != FUNCTION_DECL
)
3523 warning ("declaration of `%s' has `extern' and is initialized",
3524 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3526 DECL_EXTERNAL (decl
) = 0;
3527 if (current_binding_level
== global_binding_level
)
3528 TREE_STATIC (decl
) = 1;
3530 /* Tell `pushdecl' this is an initialized decl
3531 even though we don't yet have the initializer expression.
3532 Also tell `finish_decl' it may store the real initializer. */
3533 DECL_INITIAL (decl
) = error_mark_node
;
3536 /* If this is a function declaration, write a record describing it to the
3537 prototypes file (if requested). */
3539 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3540 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3542 /* ANSI specifies that a tentative definition which is not merged with
3543 a non-tentative definition behaves exactly like a definition with an
3544 initializer equal to zero. (Section 3.7.2)
3545 -fno-common gives strict ANSI behavior. Usually you don't want it.
3546 This matters only for variables with external linkage. */
3547 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3548 DECL_COMMON (decl
) = 1;
3550 /* Set attributes here so if duplicate decl, will have proper attributes. */
3551 decl_attributes (&decl
, attributes
, 0);
3553 if (TREE_CODE (decl
) == FUNCTION_DECL
3554 && DECL_DECLARED_INLINE_P (decl
)
3555 && DECL_UNINLINABLE (decl
)
3556 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3557 warning_with_decl (decl
,
3558 "inline function `%s' given attribute noinline");
3560 /* Add this decl to the current binding level.
3561 TEM may equal DECL or it may be a previous decl of the same name. */
3562 tem
= pushdecl (decl
);
3564 /* For a local variable, define the RTL now. */
3565 if (current_binding_level
!= global_binding_level
3566 /* But not if this is a duplicate decl
3567 and we preserved the rtl from the previous one
3568 (which may or may not happen). */
3569 && !DECL_RTL_SET_P (tem
)
3570 && !DECL_CONTEXT (tem
))
3572 if (TREE_TYPE (tem
) != error_mark_node
3573 && COMPLETE_TYPE_P (TREE_TYPE (tem
)))
3575 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3576 && DECL_INITIAL (tem
) != 0)
3583 /* Finish processing of a declaration;
3584 install its initial value.
3585 If the length of an array type is not known before,
3586 it must be determined now, from the initial value, or it is an error. */
3589 finish_decl (decl
, init
, asmspec_tree
)
3593 tree type
= TREE_TYPE (decl
);
3594 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3595 const char *asmspec
= 0;
3597 /* If a name was specified, get the string. */
3599 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3601 /* If `start_decl' didn't like having an initialization, ignore it now. */
3602 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3605 /* Don't crash if parm is initialized. */
3606 if (TREE_CODE (decl
) == PARM_DECL
)
3611 if (TREE_CODE (decl
) != TYPE_DECL
)
3612 store_init_value (decl
, init
);
3615 /* typedef foo = bar; store the type of bar as the type of foo. */
3616 TREE_TYPE (decl
) = TREE_TYPE (init
);
3617 DECL_INITIAL (decl
) = init
= 0;
3621 /* Deduce size of array from initialization, if not already known */
3622 if (TREE_CODE (type
) == ARRAY_TYPE
3623 && TYPE_DOMAIN (type
) == 0
3624 && TREE_CODE (decl
) != TYPE_DECL
)
3627 = (TREE_STATIC (decl
)
3628 /* Even if pedantic, an external linkage array
3629 may have incomplete type at first. */
3630 ? pedantic
&& !TREE_PUBLIC (decl
)
3631 : !DECL_EXTERNAL (decl
));
3633 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3635 /* Get the completed type made by complete_array_type. */
3636 type
= TREE_TYPE (decl
);
3639 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3641 else if (failure
== 2)
3644 error_with_decl (decl
, "array size missing in `%s'");
3645 /* If a `static' var's size isn't known,
3646 make it extern as well as static, so it does not get
3648 If it is not `static', then do not mark extern;
3649 finish_incomplete_decl will give it a default size
3650 and it will get allocated. */
3651 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3652 DECL_EXTERNAL (decl
) = 1;
3655 /* TYPE_MAX_VALUE is always one less than the number of elements
3656 in the array, because we start counting at zero. Therefore,
3657 warn only if the value is less than zero. */
3658 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
3659 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3660 error_with_decl (decl
, "zero or negative size array `%s'");
3662 layout_decl (decl
, 0);
3665 if (TREE_CODE (decl
) == VAR_DECL
)
3667 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3668 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3669 layout_decl (decl
, 0);
3671 if (DECL_SIZE (decl
) == 0
3672 /* Don't give an error if we already gave one earlier. */
3673 && TREE_TYPE (decl
) != error_mark_node
3674 && (TREE_STATIC (decl
)
3676 /* A static variable with an incomplete type
3677 is an error if it is initialized.
3678 Also if it is not file scope.
3679 Otherwise, let it through, but if it is not `extern'
3680 then it may cause an error message later. */
3681 (DECL_INITIAL (decl
) != 0
3682 || DECL_CONTEXT (decl
) != 0)
3684 /* An automatic variable with an incomplete type
3686 !DECL_EXTERNAL (decl
)))
3688 error_with_decl (decl
, "storage size of `%s' isn't known");
3689 TREE_TYPE (decl
) = error_mark_node
;
3692 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3693 && DECL_SIZE (decl
) != 0)
3695 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3696 constant_expression_warning (DECL_SIZE (decl
));
3698 error_with_decl (decl
, "storage size of `%s' isn't constant");
3701 if (TREE_USED (type
))
3702 TREE_USED (decl
) = 1;
3705 /* If this is a function and an assembler name is specified, it isn't
3706 builtin any more. Also reset DECL_RTL so we can give it its new
3708 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3710 DECL_BUILT_IN_CLASS (decl
) = NOT_BUILT_IN
;
3711 SET_DECL_RTL (decl
, NULL_RTX
);
3712 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (asmspec
));
3715 /* Output the assembler code and/or RTL code for variables and functions,
3716 unless the type is an undefined structure or union.
3717 If not, it will get done when the type is completed. */
3719 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3721 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3722 maybe_objc_check_decl (decl
);
3724 if (!DECL_CONTEXT (decl
))
3726 if (DECL_INITIAL (decl
) == NULL_TREE
3727 || DECL_INITIAL (decl
) == error_mark_node
)
3728 /* Don't output anything
3729 when a tentative file-scope definition is seen.
3730 But at end of compilation, do output code for them. */
3731 DECL_DEFER_OUTPUT (decl
) = 1;
3732 rest_of_decl_compilation (decl
, asmspec
,
3733 (DECL_CONTEXT (decl
) == 0
3734 || TREE_ASM_WRITTEN (decl
)), 0);
3738 /* This is a local variable. If there is an ASMSPEC, the
3739 user has requested that we handle it specially. */
3742 /* In conjunction with an ASMSPEC, the `register'
3743 keyword indicates that we should place the variable
3744 in a particular register. */
3745 if (DECL_REGISTER (decl
))
3746 DECL_C_HARD_REGISTER (decl
) = 1;
3748 /* If this is not a static variable, issue a warning.
3749 It doesn't make any sense to give an ASMSPEC for an
3750 ordinary, non-register local variable. Historically,
3751 GCC has accepted -- but ignored -- the ASMSPEC in
3753 if (TREE_CODE (decl
) == VAR_DECL
3754 && !DECL_REGISTER (decl
)
3755 && !TREE_STATIC (decl
))
3756 warning_with_decl (decl
,
3757 "ignoring asm-specifier for non-static local variable `%s'");
3759 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (asmspec
));
3762 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3763 add_decl_stmt (decl
);
3766 if (DECL_CONTEXT (decl
) != 0)
3768 /* Recompute the RTL of a local array now
3769 if it used to be an incomplete type. */
3771 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3773 /* If we used it already as memory, it must stay in memory. */
3774 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3775 /* If it's still incomplete now, no init will save it. */
3776 if (DECL_SIZE (decl
) == 0)
3777 DECL_INITIAL (decl
) = 0;
3782 if (TREE_CODE (decl
) == TYPE_DECL
)
3784 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3785 maybe_objc_check_decl (decl
);
3786 rest_of_decl_compilation (decl
, NULL
, DECL_CONTEXT (decl
) == 0, 0);
3789 /* At the end of a declaration, throw away any variable type sizes
3790 of types defined inside that declaration. There is no use
3791 computing them in the following function definition. */
3792 if (current_binding_level
== global_binding_level
)
3793 get_pending_sizes ();
3796 /* If DECL has a cleanup, build and return that cleanup here.
3797 This is a callback called by expand_expr. */
3800 maybe_build_cleanup (decl
)
3801 tree decl ATTRIBUTE_UNUSED
;
3803 /* There are no cleanups in C. */
3807 /* Given a parsed parameter declaration,
3808 decode it into a PARM_DECL and push that on the current binding level.
3809 Also, for the sake of forward parm decls,
3810 record the given order of parms in `parm_order'. */
3813 push_parm_decl (parm
)
3817 int old_immediate_size_expand
= immediate_size_expand
;
3818 /* Don't try computing parm sizes now -- wait till fn is called. */
3819 immediate_size_expand
= 0;
3821 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3822 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3823 decl_attributes (&decl
, TREE_VALUE (parm
), 0);
3826 if (DECL_NAME (decl
))
3829 olddecl
= lookup_name (DECL_NAME (decl
));
3830 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3831 pedwarn_with_decl (decl
,
3832 "ISO C forbids parameter `%s' shadowing typedef");
3836 decl
= pushdecl (decl
);
3838 immediate_size_expand
= old_immediate_size_expand
;
3840 current_binding_level
->parm_order
3841 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3843 /* Add this decl to the current binding level. */
3844 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3847 /* Clear the given order of parms in `parm_order'.
3848 Used at start of parm list,
3849 and also at semicolon terminating forward decls. */
3854 current_binding_level
->parm_order
= NULL_TREE
;
3857 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3858 literal, which may be an incomplete array type completed by the
3859 initializer; INIT is a CONSTRUCTOR that initializes the compound
3863 build_compound_literal (type
, init
)
3867 /* We do not use start_decl here because we have a type, not a declarator;
3868 and do not use finish_decl because the decl should be stored inside
3869 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3870 tree decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3873 DECL_EXTERNAL (decl
) = 0;
3874 TREE_PUBLIC (decl
) = 0;
3875 TREE_STATIC (decl
) = (current_binding_level
== global_binding_level
);
3876 DECL_CONTEXT (decl
) = current_function_decl
;
3877 TREE_USED (decl
) = 1;
3878 TREE_TYPE (decl
) = type
;
3879 store_init_value (decl
, init
);
3881 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3883 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3888 type
= TREE_TYPE (decl
);
3889 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3890 return error_mark_node
;
3892 stmt
= build_stmt (DECL_STMT
, decl
);
3893 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3894 TREE_SIDE_EFFECTS (complit
) = 1;
3896 layout_decl (decl
, 0);
3898 if (TREE_STATIC (decl
))
3900 /* This decl needs a name for the assembler output. We also need
3901 a unique suffix to be added to the name, for which DECL_CONTEXT
3903 DECL_NAME (decl
) = get_identifier ("__compound_literal");
3904 DECL_CONTEXT (decl
) = complit
;
3905 rest_of_decl_compilation (decl
, NULL
, 1, 0);
3906 DECL_CONTEXT (decl
) = NULL_TREE
;
3912 /* Make TYPE a complete type based on INITIAL_VALUE.
3913 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3914 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3917 complete_array_type (type
, initial_value
, do_default
)
3922 tree maxindex
= NULL_TREE
;
3927 /* Note MAXINDEX is really the maximum index,
3928 one less than the size. */
3929 if (TREE_CODE (initial_value
) == STRING_CST
)
3932 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3933 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3936 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3938 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3939 maxindex
= build_int_2 (-1, -1);
3940 for (; elts
; elts
= TREE_CHAIN (elts
))
3942 if (TREE_PURPOSE (elts
))
3943 maxindex
= TREE_PURPOSE (elts
);
3945 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3946 maxindex
, integer_one_node
));
3948 maxindex
= copy_node (maxindex
);
3952 /* Make an error message unless that happened already. */
3953 if (initial_value
!= error_mark_node
)
3956 /* Prevent further error messages. */
3957 maxindex
= build_int_2 (0, 0);
3964 maxindex
= build_int_2 (0, 0);
3970 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3971 if (!TREE_TYPE (maxindex
))
3972 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3975 /* Lay out the type now that we can get the real answer. */
3982 /* Given declspecs and a declarator,
3983 determine the name and type of the object declared
3984 and construct a ..._DECL node for it.
3985 (In one case we can return a ..._TYPE node instead.
3986 For invalid input we sometimes return 0.)
3988 DECLSPECS is a chain of tree_list nodes whose value fields
3989 are the storage classes and type specifiers.
3991 DECL_CONTEXT says which syntactic context this declaration is in:
3992 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3993 FUNCDEF for a function definition. Like NORMAL but a few different
3994 error messages in each case. Return value may be zero meaning
3995 this definition is too screwy to try to parse.
3996 PARM for a parameter declaration (either within a function prototype
3997 or before a function body). Make a PARM_DECL, or return void_type_node.
3998 TYPENAME if for a typename (in a cast or sizeof).
3999 Don't make a DECL node; just return the ..._TYPE node.
4000 FIELD for a struct or union field; make a FIELD_DECL.
4001 BITFIELD for a field with specified width.
4002 INITIALIZED is 1 if the decl has an initializer.
4004 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4005 It may also be so in the PARM case, for a prototype where the
4006 argument type is specified but not the name.
4008 This function is where the complicated C meanings of `static'
4009 and `extern' are interpreted. */
4012 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4015 enum decl_context decl_context
;
4020 tree type
= NULL_TREE
;
4025 int type_quals
= TYPE_UNQUALIFIED
;
4027 int explicit_int
= 0;
4028 int explicit_char
= 0;
4029 int defaulted_int
= 0;
4030 tree typedef_decl
= 0;
4032 tree typedef_type
= 0;
4033 int funcdef_flag
= 0;
4034 enum tree_code innermost_code
= ERROR_MARK
;
4036 int size_varies
= 0;
4037 tree decl_attr
= NULL_TREE
;
4038 tree array_ptr_quals
= NULL_TREE
;
4039 int array_parm_static
= 0;
4040 tree returned_attrs
= NULL_TREE
;
4042 if (decl_context
== BITFIELD
)
4043 bitfield
= 1, decl_context
= FIELD
;
4045 if (decl_context
== FUNCDEF
)
4046 funcdef_flag
= 1, decl_context
= NORMAL
;
4048 /* Look inside a declarator for the name being declared
4049 and get it as a string, for an error message. */
4051 tree decl
= declarator
;
4055 switch (TREE_CODE (decl
))
4060 innermost_code
= TREE_CODE (decl
);
4061 decl
= TREE_OPERAND (decl
, 0);
4065 decl
= TREE_VALUE (decl
);
4068 case IDENTIFIER_NODE
:
4069 name
= IDENTIFIER_POINTER (decl
);
4080 /* A function definition's declarator must have the form of
4081 a function declarator. */
4083 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4086 /* Anything declared one level down from the top level
4087 must be one of the parameters of a function
4088 (because the body is at least two levels down). */
4090 /* If this looks like a function definition, make it one,
4091 even if it occurs where parms are expected.
4092 Then store_parm_decls will reject it and not use it as a parm. */
4093 if (decl_context
== NORMAL
&& !funcdef_flag
4094 && current_binding_level
->parm_flag
)
4095 decl_context
= PARM
;
4097 /* Look through the decl specs and record which ones appear.
4098 Some typespecs are defined as built-in typenames.
4099 Others, the ones that are modifiers of other types,
4100 are represented by bits in SPECBITS: set the bits for
4101 the modifiers that appear. Storage class keywords are also in SPECBITS.
4103 If there is a typedef name or a type, store the type in TYPE.
4104 This includes builtin typedefs such as `int'.
4106 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4107 and did not come from a user typedef.
4109 Set LONGLONG if `long' is mentioned twice. */
4111 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4113 tree id
= TREE_VALUE (spec
);
4115 /* If the entire declaration is itself tagged as deprecated then
4116 suppress reports of deprecated items. */
4117 if (id
&& TREE_DEPRECATED (id
))
4119 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
4120 warn_deprecated_use (id
);
4123 if (id
== ridpointers
[(int) RID_INT
])
4125 if (id
== ridpointers
[(int) RID_CHAR
])
4128 if (TREE_CODE (id
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (id
))
4130 enum rid i
= C_RID_CODE (id
);
4131 if ((int) i
<= (int) RID_LAST_MODIFIER
)
4133 if (i
== RID_LONG
&& (specbits
& (1 << (int) i
)))
4136 error ("`long long long' is too long for GCC");
4139 if (pedantic
&& !flag_isoc99
&& ! in_system_header
4141 pedwarn ("ISO C89 does not support `long long'");
4145 else if (specbits
& (1 << (int) i
))
4146 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4147 specbits
|= 1 << (int) i
;
4152 error ("two or more data types in declaration of `%s'", name
);
4153 /* Actual typedefs come to us as TYPE_DECL nodes. */
4154 else if (TREE_CODE (id
) == TYPE_DECL
)
4156 type
= TREE_TYPE (id
);
4157 decl_attr
= DECL_ATTRIBUTES (id
);
4160 /* Built-in types come as identifiers. */
4161 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4163 tree t
= lookup_name (id
);
4164 if (TREE_TYPE (t
) == error_mark_node
)
4166 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4167 error ("`%s' fails to be a typedef or built in type",
4168 IDENTIFIER_POINTER (id
));
4171 type
= TREE_TYPE (t
);
4175 else if (TREE_CODE (id
) != ERROR_MARK
)
4182 typedef_type
= type
;
4184 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4186 /* No type at all: default to `int', and set DEFAULTED_INT
4187 because it was not a user-defined typedef. */
4191 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4192 | (1 << (int) RID_SIGNED
)
4193 | (1 << (int) RID_UNSIGNED
)
4194 | (1 << (int) RID_COMPLEX
))))
4195 /* Don't warn about typedef foo = bar. */
4196 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4197 && ! in_system_header
)
4199 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4200 and this is a function, or if -Wimplicit; prefer the former
4201 warning since it is more explicit. */
4202 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4204 warn_about_return_type
= 1;
4205 else if (warn_implicit_int
|| flag_isoc99
)
4206 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4211 type
= integer_type_node
;
4214 /* Now process the modifiers that were specified
4215 and check for invalid combinations. */
4217 /* Long double is a special combination. */
4219 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4220 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4222 specbits
&= ~(1 << (int) RID_LONG
);
4223 type
= long_double_type_node
;
4226 /* Check all other uses of type modifiers. */
4228 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4229 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4233 if ((specbits
& 1 << (int) RID_LONG
)
4234 && (specbits
& 1 << (int) RID_SHORT
))
4235 error ("both long and short specified for `%s'", name
);
4236 else if (((specbits
& 1 << (int) RID_LONG
)
4237 || (specbits
& 1 << (int) RID_SHORT
))
4239 error ("long or short specified with char for `%s'", name
);
4240 else if (((specbits
& 1 << (int) RID_LONG
)
4241 || (specbits
& 1 << (int) RID_SHORT
))
4242 && TREE_CODE (type
) == REAL_TYPE
)
4244 static int already
= 0;
4246 error ("long or short specified with floating type for `%s'", name
);
4247 if (! already
&& ! pedantic
)
4249 error ("the only valid combination is `long double'");
4253 else if ((specbits
& 1 << (int) RID_SIGNED
)
4254 && (specbits
& 1 << (int) RID_UNSIGNED
))
4255 error ("both signed and unsigned specified for `%s'", name
);
4256 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4257 error ("long, short, signed or unsigned invalid for `%s'", name
);
4261 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4263 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4265 if (flag_pedantic_errors
)
4270 /* Discard the type modifiers if they are invalid. */
4273 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4274 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4279 if ((specbits
& (1 << (int) RID_COMPLEX
))
4280 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4282 error ("complex invalid for `%s'", name
);
4283 specbits
&= ~(1 << (int) RID_COMPLEX
);
4286 /* Decide whether an integer type is signed or not.
4287 Optionally treat bitfields as signed by default. */
4288 if (specbits
& 1 << (int) RID_UNSIGNED
4289 /* Traditionally, all bitfields are unsigned. */
4290 || (bitfield
&& flag_traditional
4291 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4292 || (bitfield
&& ! flag_signed_bitfields
4293 && (explicit_int
|| defaulted_int
|| explicit_char
4294 /* A typedef for plain `int' without `signed'
4295 can be controlled just like plain `int'. */
4296 || ! (typedef_decl
!= 0
4297 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4298 && TREE_CODE (type
) != ENUMERAL_TYPE
4299 && !(specbits
& 1 << (int) RID_SIGNED
)))
4302 type
= long_long_unsigned_type_node
;
4303 else if (specbits
& 1 << (int) RID_LONG
)
4304 type
= long_unsigned_type_node
;
4305 else if (specbits
& 1 << (int) RID_SHORT
)
4306 type
= short_unsigned_type_node
;
4307 else if (type
== char_type_node
)
4308 type
= unsigned_char_type_node
;
4309 else if (typedef_decl
)
4310 type
= unsigned_type (type
);
4312 type
= unsigned_type_node
;
4314 else if ((specbits
& 1 << (int) RID_SIGNED
)
4315 && type
== char_type_node
)
4316 type
= signed_char_type_node
;
4318 type
= long_long_integer_type_node
;
4319 else if (specbits
& 1 << (int) RID_LONG
)
4320 type
= long_integer_type_node
;
4321 else if (specbits
& 1 << (int) RID_SHORT
)
4322 type
= short_integer_type_node
;
4324 if (specbits
& 1 << (int) RID_COMPLEX
)
4326 if (pedantic
&& !flag_isoc99
)
4327 pedwarn ("ISO C89 does not support complex types");
4328 /* If we just have "complex", it is equivalent to
4329 "complex double", but if any modifiers at all are specified it is
4330 the complex form of TYPE. E.g, "complex short" is
4331 "complex short int". */
4333 if (defaulted_int
&& ! longlong
4334 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4335 | (1 << (int) RID_SIGNED
)
4336 | (1 << (int) RID_UNSIGNED
))))
4339 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4340 type
= complex_double_type_node
;
4342 else if (type
== integer_type_node
)
4345 pedwarn ("ISO C does not support complex integer types");
4346 type
= complex_integer_type_node
;
4348 else if (type
== float_type_node
)
4349 type
= complex_float_type_node
;
4350 else if (type
== double_type_node
)
4351 type
= complex_double_type_node
;
4352 else if (type
== long_double_type_node
)
4353 type
= complex_long_double_type_node
;
4357 pedwarn ("ISO C does not support complex integer types");
4358 type
= build_complex_type (type
);
4362 /* Figure out the type qualifiers for the declaration. There are
4363 two ways a declaration can become qualified. One is something
4364 like `const int i' where the `const' is explicit. Another is
4365 something like `typedef const int CI; CI i' where the type of the
4366 declaration contains the `const'. */
4367 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4368 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4369 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4370 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4371 if (constp
> 1 && ! flag_isoc99
)
4372 pedwarn ("duplicate `const'");
4373 if (restrictp
> 1 && ! flag_isoc99
)
4374 pedwarn ("duplicate `restrict'");
4375 if (volatilep
> 1 && ! flag_isoc99
)
4376 pedwarn ("duplicate `volatile'");
4377 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4378 type
= TYPE_MAIN_VARIANT (type
);
4379 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4380 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4381 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4383 /* Warn if two storage classes are given. Default to `auto'. */
4388 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4389 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4390 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4391 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4392 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4394 /* Warn about storage classes that are invalid for certain
4395 kinds of declarations (parameters, typenames, etc.). */
4398 error ("multiple storage classes in declaration of `%s'", name
);
4399 else if (funcdef_flag
4401 & ((1 << (int) RID_REGISTER
)
4402 | (1 << (int) RID_AUTO
)
4403 | (1 << (int) RID_TYPEDEF
))))
4405 if (specbits
& 1 << (int) RID_AUTO
4406 && (pedantic
|| current_binding_level
== global_binding_level
))
4407 pedwarn ("function definition declared `auto'");
4408 if (specbits
& 1 << (int) RID_REGISTER
)
4409 error ("function definition declared `register'");
4410 if (specbits
& 1 << (int) RID_TYPEDEF
)
4411 error ("function definition declared `typedef'");
4412 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4413 | (1 << (int) RID_AUTO
));
4415 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4417 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4421 switch (decl_context
)
4424 error ("storage class specified for structure field `%s'",
4428 error ("storage class specified for parameter `%s'", name
);
4431 error ("storage class specified for typename");
4434 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4435 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4436 | (1 << (int) RID_EXTERN
));
4439 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4441 /* `extern' with initialization is invalid if not at top level. */
4442 if (current_binding_level
== global_binding_level
)
4443 warning ("`%s' initialized and declared `extern'", name
);
4445 error ("`%s' has both `extern' and initializer", name
);
4447 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4448 && current_binding_level
!= global_binding_level
)
4449 error ("nested function `%s' declared `extern'", name
);
4450 else if (current_binding_level
== global_binding_level
4451 && specbits
& (1 << (int) RID_AUTO
))
4452 error ("top-level declaration of `%s' specifies `auto'", name
);
4455 /* Now figure out the structure of the declarator proper.
4456 Descend through it, creating more complex types, until we reach
4457 the declared identifier (or NULL_TREE, in an absolute declarator). */
4459 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4461 if (type
== error_mark_node
)
4463 declarator
= TREE_OPERAND (declarator
, 0);
4467 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4468 an INDIRECT_REF (for *...),
4469 a CALL_EXPR (for ...(...)),
4470 a TREE_LIST (for nested attributes),
4471 an identifier (for the name being declared)
4472 or a null pointer (for the place in an absolute declarator
4473 where the name was omitted).
4474 For the last two cases, we have just exited the loop.
4476 At this point, TYPE is the type of elements of an array,
4477 or for a function to return, or for a pointer to point to.
4478 After this sequence of ifs, TYPE is the type of the
4479 array or function or pointer, and DECLARATOR has had its
4480 outermost layer removed. */
4482 if (array_ptr_quals
!= NULL_TREE
|| array_parm_static
)
4484 /* Only the innermost declarator (making a parameter be of
4485 array type which is converted to pointer type)
4486 may have static or type qualifiers. */
4487 error ("static or type qualifiers in non-parameter array declarator");
4488 array_ptr_quals
= NULL_TREE
;
4489 array_parm_static
= 0;
4492 if (TREE_CODE (declarator
) == TREE_LIST
)
4494 /* We encode a declarator with embedded attributes using
4496 tree attrs
= TREE_PURPOSE (declarator
);
4499 declarator
= TREE_VALUE (declarator
);
4500 inner_decl
= declarator
;
4501 while (inner_decl
!= NULL_TREE
4502 && TREE_CODE (inner_decl
) == TREE_LIST
)
4503 inner_decl
= TREE_VALUE (inner_decl
);
4504 if (inner_decl
== NULL_TREE
4505 || TREE_CODE (inner_decl
) == IDENTIFIER_NODE
)
4506 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
4507 if (TREE_CODE (inner_decl
) == CALL_EXPR
)
4508 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
4509 if (TREE_CODE (inner_decl
) == ARRAY_REF
)
4510 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
4511 returned_attrs
= decl_attributes (&type
,
4512 chainon (returned_attrs
, attrs
),
4515 else if (TREE_CODE (declarator
) == ARRAY_REF
)
4517 tree itype
= NULL_TREE
;
4518 tree size
= TREE_OPERAND (declarator
, 1);
4519 /* The index is a signed object `sizetype' bits wide. */
4520 tree index_type
= signed_type (sizetype
);
4522 array_ptr_quals
= TREE_TYPE (declarator
);
4523 array_parm_static
= TREE_STATIC (declarator
);
4525 declarator
= TREE_OPERAND (declarator
, 0);
4527 /* Check for some types that there cannot be arrays of. */
4529 if (VOID_TYPE_P (type
))
4531 error ("declaration of `%s' as array of voids", name
);
4532 type
= error_mark_node
;
4535 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4537 error ("declaration of `%s' as array of functions", name
);
4538 type
= error_mark_node
;
4541 if (size
== error_mark_node
)
4542 type
= error_mark_node
;
4544 if (type
== error_mark_node
)
4547 /* If size was specified, set ITYPE to a range-type for that size.
4548 Otherwise, ITYPE remains null. finish_decl may figure it out
4549 from an initial value. */
4553 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4554 STRIP_TYPE_NOPS (size
);
4556 if (! INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4558 error ("size of array `%s' has non-integer type", name
);
4559 size
= integer_one_node
;
4562 if (pedantic
&& integer_zerop (size
))
4563 pedwarn ("ISO C forbids zero-size array `%s'", name
);
4565 if (TREE_CODE (size
) == INTEGER_CST
)
4567 constant_expression_warning (size
);
4568 if (tree_int_cst_sgn (size
) < 0)
4570 error ("size of array `%s' is negative", name
);
4571 size
= integer_one_node
;
4576 /* Make sure the array size remains visibly nonconstant
4577 even if it is (eg) a const variable with known value. */
4582 if (TREE_CONSTANT (size
))
4583 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4586 pedwarn ("ISO C89 forbids variable-size array `%s'",
4591 if (integer_zerop (size
))
4593 /* A zero-length array cannot be represented with an
4594 unsigned index type, which is what we'll get with
4595 build_index_type. Create an open-ended range instead. */
4596 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4600 /* Compute the maximum valid index, that is, size - 1.
4601 Do the calculation in index_type, so that if it is
4602 a variable the computations will be done in the
4604 itype
= fold (build (MINUS_EXPR
, index_type
,
4605 convert (index_type
, size
),
4606 convert (index_type
, size_one_node
)));
4608 /* If that overflowed, the array is too big.
4609 ??? While a size of INT_MAX+1 technically shouldn't
4610 cause an overflow (because we subtract 1), the overflow
4611 is recorded during the conversion to index_type, before
4612 the subtraction. Handling this case seems like an
4613 unnecessary complication. */
4614 if (TREE_OVERFLOW (itype
))
4616 error ("size of array `%s' is too large", name
);
4617 type
= error_mark_node
;
4622 itype
= variable_size (itype
);
4623 itype
= build_index_type (itype
);
4626 else if (decl_context
== FIELD
)
4628 /* ??? Need to check somewhere that this is a structure
4629 and not a union, that this field is last, and that
4630 this structure has at least one other named member. */
4632 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4633 pedwarn ("ISO C89 does not support flexible array members");
4635 /* ISO C99 Flexible array members are effectively identical
4636 to GCC's zero-length array extension. */
4637 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4640 /* If pedantic, complain about arrays of incomplete types. */
4642 if (pedantic
&& !COMPLETE_TYPE_P (type
))
4643 pedwarn ("array type has incomplete element type");
4646 /* We shouldn't have a function type here at all!
4647 Functions aren't allowed as array elements. */
4648 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4649 && (constp
|| volatilep
))
4650 pedwarn ("ISO C forbids const or volatile function types");
4653 /* Build the array type itself, then merge any constancy or
4654 volatility into the target type. We must do it in this order
4655 to ensure that the TYPE_MAIN_VARIANT field of the array type
4656 is set correctly. */
4658 type
= build_array_type (type
, itype
);
4660 type
= c_build_qualified_type (type
, type_quals
);
4663 C_TYPE_VARIABLE_SIZE (type
) = 1;
4665 /* The GCC extension for zero-length arrays differs from
4666 ISO flexible array members in that sizeof yields zero. */
4667 if (size
&& integer_zerop (size
))
4670 TYPE_SIZE (type
) = bitsize_zero_node
;
4671 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4673 if (decl_context
!= PARM
4674 && (array_ptr_quals
!= NULL_TREE
|| array_parm_static
))
4676 error ("static or type qualifiers in non-parameter array declarator");
4677 array_ptr_quals
= NULL_TREE
;
4678 array_parm_static
= 0;
4681 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4685 /* Declaring a function type.
4686 Make sure we have a valid type for the function to return. */
4687 if (type
== error_mark_node
)
4692 /* Warn about some types functions can't return. */
4694 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4696 error ("`%s' declared as function returning a function", name
);
4697 type
= integer_type_node
;
4699 if (TREE_CODE (type
) == ARRAY_TYPE
)
4701 error ("`%s' declared as function returning an array", name
);
4702 type
= integer_type_node
;
4705 #ifndef TRADITIONAL_RETURN_FLOAT
4706 /* Traditionally, declaring return type float means double. */
4708 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4709 type
= double_type_node
;
4710 #endif /* TRADITIONAL_RETURN_FLOAT */
4712 /* Construct the function type and go to the next
4713 inner layer of declarator. */
4715 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4717 /* Say it's a definition
4718 only for the CALL_EXPR
4719 closest to the identifier. */
4720 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4721 /* Type qualifiers before the return type of the function
4722 qualify the return type, not the function type. */
4725 /* Type qualifiers on a function return type are normally
4726 permitted by the standard but have no effect, so give a
4727 warning at -W. Qualifiers on a void return type have
4728 meaning as a GNU extension, and are banned on function
4729 definitions in ISO C. FIXME: strictly we shouldn't
4730 pedwarn for qualified void return types except on function
4731 definitions, but not doing so could lead to the undesirable
4732 state of a "volatile void" function return type not being
4733 warned about, and a use of the function being compiled
4734 with GNU semantics, with no diagnostics under -pedantic. */
4735 if (VOID_TYPE_P (type
) && pedantic
&& !in_system_header
)
4736 pedwarn ("ISO C forbids qualified void function return type");
4737 else if (extra_warnings
4738 && !(VOID_TYPE_P (type
)
4739 && type_quals
== TYPE_QUAL_VOLATILE
))
4740 warning ("type qualifiers ignored on function return type");
4742 type
= c_build_qualified_type (type
, type_quals
);
4744 type_quals
= TYPE_UNQUALIFIED
;
4746 type
= build_function_type (type
, arg_types
);
4747 declarator
= TREE_OPERAND (declarator
, 0);
4749 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4750 the formal parameter list of this FUNCTION_TYPE to point to
4751 the FUNCTION_TYPE node itself. */
4756 for (link
= last_function_parm_tags
;
4758 link
= TREE_CHAIN (link
))
4759 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4762 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4764 /* Merge any constancy or volatility into the target type
4767 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4769 pedwarn ("ISO C forbids qualified function types");
4771 type
= c_build_qualified_type (type
, type_quals
);
4772 type_quals
= TYPE_UNQUALIFIED
;
4775 type
= build_pointer_type (type
);
4777 /* Process a list of type modifier keywords
4778 (such as const or volatile) that were given inside the `*'. */
4780 if (TREE_TYPE (declarator
))
4788 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4789 typemodlist
= TREE_CHAIN (typemodlist
))
4791 tree qualifier
= TREE_VALUE (typemodlist
);
4793 if (C_IS_RESERVED_WORD (qualifier
))
4795 if (C_RID_CODE (qualifier
) == RID_CONST
)
4797 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4799 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4809 error ("invalid type modifier within pointer declarator");
4810 if (constp
> 1 && ! flag_isoc99
)
4811 pedwarn ("duplicate `const'");
4812 if (volatilep
> 1 && ! flag_isoc99
)
4813 pedwarn ("duplicate `volatile'");
4814 if (restrictp
> 1 && ! flag_isoc99
)
4815 pedwarn ("duplicate `restrict'");
4817 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4818 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4819 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4822 declarator
= TREE_OPERAND (declarator
, 0);
4829 /* Now TYPE has the actual type. */
4831 /* Did array size calculations overflow? */
4833 if (TREE_CODE (type
) == ARRAY_TYPE
4834 && COMPLETE_TYPE_P (type
)
4835 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4837 error ("size of array `%s' is too large", name
);
4838 /* If we proceed with the array type as it is, we'll eventually
4839 crash in tree_low_cst(). */
4840 type
= error_mark_node
;
4843 /* If this is declaring a typedef name, return a TYPE_DECL. */
4845 if (specbits
& (1 << (int) RID_TYPEDEF
))
4848 /* Note that the grammar rejects storage classes
4849 in typenames, fields or parameters */
4850 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4852 pedwarn ("ISO C forbids qualified function types");
4854 type
= c_build_qualified_type (type
, type_quals
);
4855 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4856 if ((specbits
& (1 << (int) RID_SIGNED
))
4857 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4858 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4859 decl_attributes (&decl
, returned_attrs
, 0);
4863 /* Detect the case of an array type of unspecified size
4864 which came, as such, direct from a typedef name.
4865 We must copy the type, so that each identifier gets
4866 a distinct type, so that each identifier's size can be
4867 controlled separately by its own initializer. */
4869 if (type
!= 0 && typedef_type
!= 0
4870 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4871 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4873 type
= build_array_type (TREE_TYPE (type
), 0);
4875 C_TYPE_VARIABLE_SIZE (type
) = 1;
4878 /* If this is a type name (such as, in a cast or sizeof),
4879 compute the type and return it now. */
4881 if (decl_context
== TYPENAME
)
4883 /* Note that the grammar rejects storage classes
4884 in typenames, fields or parameters */
4885 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4887 pedwarn ("ISO C forbids const or volatile function types");
4889 type
= c_build_qualified_type (type
, type_quals
);
4890 decl_attributes (&type
, returned_attrs
, 0);
4894 /* Aside from typedefs and type names (handle above),
4895 `void' at top level (not within pointer)
4896 is allowed only in public variables.
4897 We don't complain about parms either, but that is because
4898 a better error message can be made later. */
4900 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4901 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4902 && ((specbits
& (1 << (int) RID_EXTERN
))
4903 || (current_binding_level
== global_binding_level
4905 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4907 error ("variable or field `%s' declared void", name
);
4908 type
= integer_type_node
;
4911 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4912 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4917 if (decl_context
== PARM
)
4919 tree type_as_written
;
4922 /* A parameter declared as an array of T is really a pointer to T.
4923 One declared as a function is really a pointer to a function. */
4925 if (TREE_CODE (type
) == ARRAY_TYPE
)
4927 /* Transfer const-ness of array into that of type pointed to. */
4928 type
= TREE_TYPE (type
);
4930 type
= c_build_qualified_type (type
, type_quals
);
4931 type
= build_pointer_type (type
);
4932 type_quals
= TYPE_UNQUALIFIED
;
4933 if (array_ptr_quals
)
4935 tree new_ptr_quals
, new_ptr_attrs
;
4937 split_specs_attrs (array_ptr_quals
, &new_ptr_quals
, &new_ptr_attrs
);
4938 /* We don't yet implement attributes in this context. */
4939 if (new_ptr_attrs
!= NULL_TREE
)
4940 warning ("attributes in parameter array declarator ignored");
4945 for (; new_ptr_quals
; new_ptr_quals
= TREE_CHAIN (new_ptr_quals
))
4947 tree qualifier
= TREE_VALUE (new_ptr_quals
);
4949 if (C_IS_RESERVED_WORD (qualifier
))
4951 if (C_RID_CODE (qualifier
) == RID_CONST
)
4953 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4955 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4965 error ("invalid type modifier within array declarator");
4967 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4968 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4969 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4973 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4975 if (pedantic
&& type_quals
)
4976 pedwarn ("ISO C forbids qualified function types");
4978 type
= c_build_qualified_type (type
, type_quals
);
4979 type
= build_pointer_type (type
);
4980 type_quals
= TYPE_UNQUALIFIED
;
4982 else if (type_quals
)
4983 type
= c_build_qualified_type (type
, type_quals
);
4985 type_as_written
= type
;
4987 decl
= build_decl (PARM_DECL
, declarator
, type
);
4989 C_DECL_VARIABLE_SIZE (decl
) = 1;
4991 /* Compute the type actually passed in the parmlist,
4992 for the case where there is no prototype.
4993 (For example, shorts and chars are passed as ints.)
4994 When there is a prototype, this is overridden later. */
4996 if (type
== error_mark_node
)
4997 promoted_type
= type
;
5000 promoted_type
= simple_type_promotes_to (type
);
5001 if (! promoted_type
)
5002 promoted_type
= type
;
5005 DECL_ARG_TYPE (decl
) = promoted_type
;
5006 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
5008 else if (decl_context
== FIELD
)
5010 /* Structure field. It may not be a function. */
5012 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5014 error ("field `%s' declared as a function", name
);
5015 type
= build_pointer_type (type
);
5017 else if (TREE_CODE (type
) != ERROR_MARK
5018 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5020 error ("field `%s' has incomplete type", name
);
5021 type
= error_mark_node
;
5023 /* Move type qualifiers down to element of an array. */
5024 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
5026 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
5028 TYPE_DOMAIN (type
));
5030 /* Leave the field const or volatile as well. */
5031 type_quals
= TYPE_UNQUALIFIED
;
5034 decl
= build_decl (FIELD_DECL
, declarator
, type
);
5035 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5038 C_DECL_VARIABLE_SIZE (decl
) = 1;
5040 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5042 /* Every function declaration is "external"
5043 except for those which are inside a function body
5044 in which `auto' is used.
5045 That is a case not specified by ANSI C,
5046 and we use it for forward declarations for nested functions. */
5047 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
5048 || current_binding_level
== global_binding_level
);
5050 if (specbits
& (1 << (int) RID_AUTO
)
5051 && (pedantic
|| current_binding_level
== global_binding_level
))
5052 pedwarn ("invalid storage class for function `%s'", name
);
5053 if (specbits
& (1 << (int) RID_REGISTER
))
5054 error ("invalid storage class for function `%s'", name
);
5055 /* Function declaration not at top level.
5056 Storage classes other than `extern' are not allowed
5057 and `extern' makes no difference. */
5058 if (current_binding_level
!= global_binding_level
5059 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
5061 pedwarn ("invalid storage class for function `%s'", name
);
5063 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
5064 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5066 DECL_LANG_SPECIFIC (decl
) = (struct lang_decl
*)
5067 ggc_alloc_cleared (sizeof (struct lang_decl
));
5069 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
5070 pedwarn ("ISO C forbids qualified function types");
5072 /* GNU C interprets a `volatile void' return type to indicate
5073 that the function does not return. */
5074 if ((type_quals
& TYPE_QUAL_VOLATILE
)
5075 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
5076 warning ("`noreturn' function returns non-void value");
5079 DECL_EXTERNAL (decl
) = 1;
5080 /* Record absence of global scope for `static' or `auto'. */
5082 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
5084 /* Record presence of `inline', if it is reasonable. */
5085 if (MAIN_NAME_P (declarator
))
5088 warning ("cannot inline function `main'");
5092 /* Assume that otherwise the function can be inlined. */
5093 DECL_DECLARED_INLINE_P (decl
) = 1;
5095 /* Do not mark bare declarations as DECL_INLINE. Doing so
5096 in the presence of multiple declarations can result in
5097 the abstract origin pointing between the declarations,
5098 which will confuse dwarf2out. */
5101 DECL_INLINE (decl
) = 1;
5102 if (specbits
& (1 << (int) RID_EXTERN
))
5103 current_extern_inline
= 1;
5106 /* If -finline-functions, assume it can be inlined. This does
5107 two things: let the function be deferred until it is actually
5108 needed, and let dwarf2 know that the function is inlinable. */
5109 else if (flag_inline_trees
== 2 && initialized
)
5111 DECL_INLINE (decl
) = 1;
5112 DECL_DECLARED_INLINE_P (decl
) = 0;
5117 /* It's a variable. */
5118 /* An uninitialized decl with `extern' is a reference. */
5119 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
5121 /* Move type qualifiers down to element of an array. */
5122 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
5124 int saved_align
= TYPE_ALIGN(type
);
5125 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
5127 TYPE_DOMAIN (type
));
5128 TYPE_ALIGN (type
) = saved_align
;
5129 #if 0 /* Leave the variable const or volatile as well. */
5130 type_quals
= TYPE_UNQUALIFIED
;
5133 else if (type_quals
)
5134 type
= c_build_qualified_type (type
, type_quals
);
5136 decl
= build_decl (VAR_DECL
, declarator
, type
);
5138 C_DECL_VARIABLE_SIZE (decl
) = 1;
5141 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
5143 DECL_EXTERNAL (decl
) = extern_ref
;
5144 /* At top level, the presence of a `static' or `register' storage
5145 class specifier, or the absence of all storage class specifiers
5146 makes this declaration a definition (perhaps tentative). Also,
5147 the absence of both `static' and `register' makes it public. */
5148 if (current_binding_level
== global_binding_level
)
5152 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
5153 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
5155 /* Not at top level, only `static' makes a static definition. */
5158 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
5159 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
5163 /* Record `register' declaration for warnings on &
5164 and in case doing stupid register allocation. */
5166 if (specbits
& (1 << (int) RID_REGISTER
))
5167 DECL_REGISTER (decl
) = 1;
5169 /* Record constancy and volatility. */
5170 c_apply_type_quals_to_decl (type_quals
, decl
);
5172 /* If a type has volatile components, it should be stored in memory.
5173 Otherwise, the fact that those components are volatile
5174 will be ignored, and would even crash the compiler. */
5175 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5176 mark_addressable (decl
);
5178 decl_attributes (&decl
, returned_attrs
, 0);
5184 /* Decode the parameter-list info for a function type or function definition.
5185 The argument is the value returned by `get_parm_info' (or made in parse.y
5186 if there is an identifier list instead of a parameter decl list).
5187 These two functions are separate because when a function returns
5188 or receives functions then each is called multiple times but the order
5189 of calls is different. The last call to `grokparms' is always the one
5190 that contains the formal parameter names of a function definition.
5192 Store in `last_function_parms' a chain of the decls of parms.
5193 Also store in `last_function_parm_tags' a chain of the struct, union,
5194 and enum tags declared among the parms.
5196 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5198 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5199 a mere declaration. A nonempty identifier-list gets an error message
5200 when FUNCDEF_FLAG is zero. */
5203 grokparms (parms_info
, funcdef_flag
)
5207 tree first_parm
= TREE_CHAIN (parms_info
);
5209 last_function_parms
= TREE_PURPOSE (parms_info
);
5210 last_function_parm_tags
= TREE_VALUE (parms_info
);
5212 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5213 && !in_system_header
)
5214 warning ("function declaration isn't a prototype");
5217 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5220 pedwarn ("parameter names (without types) in function declaration");
5222 last_function_parms
= first_parm
;
5229 /* We no longer test FUNCDEF_FLAG.
5230 If the arg types are incomplete in a declaration,
5231 they must include undefined tags.
5232 These tags can never be defined in the scope of the declaration,
5233 so the types can never be completed,
5234 and no call can be compiled successfully. */
5236 /* In a fcn definition, arg types must be complete. */
5239 for (parm
= last_function_parms
, typelt
= first_parm
;
5241 parm
= TREE_CHAIN (parm
))
5242 /* Skip over any enumeration constants declared here. */
5243 if (TREE_CODE (parm
) == PARM_DECL
)
5245 /* Barf if the parameter itself has an incomplete type. */
5246 tree type
= TREE_VALUE (typelt
);
5247 if (type
== error_mark_node
)
5249 if (!COMPLETE_TYPE_P (type
))
5251 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5252 error ("parameter `%s' has incomplete type",
5253 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5255 warning ("parameter has incomplete type");
5258 TREE_VALUE (typelt
) = error_mark_node
;
5259 TREE_TYPE (parm
) = error_mark_node
;
5263 /* This has been replaced by parm_tags_warning, which
5264 uses a more accurate criterion for what to warn
5268 /* Now warn if is a pointer to an incomplete type. */
5269 while (TREE_CODE (type
) == POINTER_TYPE
5270 || TREE_CODE (type
) == REFERENCE_TYPE
)
5271 type
= TREE_TYPE (type
);
5272 type
= TYPE_MAIN_VARIANT (type
);
5273 if (!COMPLETE_TYPE_P (type
))
5275 if (DECL_NAME (parm
) != 0)
5276 warning ("parameter `%s' points to incomplete type",
5277 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5279 warning ("parameter points to incomplete type");
5283 typelt
= TREE_CHAIN (typelt
);
5290 /* Return a tree_list node with info on a parameter list just parsed.
5291 The TREE_PURPOSE is a chain of decls of those parms.
5292 The TREE_VALUE is a list of structure, union and enum tags defined.
5293 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5294 This tree_list node is later fed to `grokparms'.
5296 VOID_AT_END nonzero means append `void' to the end of the type-list.
5297 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5300 get_parm_info (void_at_end
)
5306 tree tags
= gettags ();
5307 tree parms
= getdecls ();
5309 tree order
= current_binding_level
->parm_order
;
5311 /* Just `void' (and no ellipsis) is special. There are really no parms.
5312 But if the `void' is qualified (by `const' or `volatile') or has a
5313 storage class specifier (`register'), then the behavior is undefined;
5314 by not counting it as the special case of `void' we will cause an
5315 error later. Typedefs for `void' are OK (see DR#157). */
5316 if (void_at_end
&& parms
!= 0
5317 && TREE_CHAIN (parms
) == 0
5318 && VOID_TYPE_P (TREE_TYPE (parms
))
5319 && ! TREE_THIS_VOLATILE (parms
)
5320 && ! TREE_READONLY (parms
)
5321 && ! DECL_REGISTER (parms
)
5322 && DECL_NAME (parms
) == 0)
5325 storedecls (NULL_TREE
);
5326 return tree_cons (NULL_TREE
, NULL_TREE
,
5327 tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5330 /* Extract enumerator values and other non-parms declared with the parms.
5331 Likewise any forward parm decls that didn't have real parm decls. */
5332 for (decl
= parms
; decl
;)
5334 tree next
= TREE_CHAIN (decl
);
5336 if (TREE_CODE (decl
) != PARM_DECL
)
5338 TREE_CHAIN (decl
) = new_parms
;
5341 else if (TREE_ASM_WRITTEN (decl
))
5343 error_with_decl (decl
,
5344 "parameter `%s' has just a forward declaration");
5345 TREE_CHAIN (decl
) = new_parms
;
5351 /* Put the parm decls back in the order they were in in the parm list. */
5352 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5355 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5357 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5360 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5363 /* Store the parmlist in the binding level since the old one
5364 is no longer a valid list. (We have changed the chain pointers.) */
5365 storedecls (new_parms
);
5367 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5368 /* There may also be declarations for enumerators if an enumeration
5369 type is declared among the parms. Ignore them here. */
5370 if (TREE_CODE (decl
) == PARM_DECL
)
5372 /* Since there is a prototype,
5373 args are passed in their declared types. */
5374 tree type
= TREE_TYPE (decl
);
5375 DECL_ARG_TYPE (decl
) = type
;
5376 if (PROMOTE_PROTOTYPES
5377 && INTEGRAL_TYPE_P (type
)
5378 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5379 DECL_ARG_TYPE (decl
) = integer_type_node
;
5381 types
= tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5382 if (VOID_TYPE_P (TREE_VALUE (types
)) && ! erred
5383 && DECL_NAME (decl
) == 0)
5385 error ("`void' in parameter list must be the entire list");
5391 return tree_cons (new_parms
, tags
,
5392 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
5394 return tree_cons (new_parms
, tags
, nreverse (types
));
5397 /* At end of parameter list, warn about any struct, union or enum tags
5398 defined within. Do so because these types cannot ever become complete. */
5401 parmlist_tags_warning ()
5406 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5408 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5409 /* An anonymous union parm type is meaningful as a GNU extension.
5410 So don't warn for that. */
5411 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5413 if (TREE_PURPOSE (elt
) != 0)
5415 if (code
== RECORD_TYPE
)
5416 warning ("`struct %s' declared inside parameter list",
5417 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5418 else if (code
== UNION_TYPE
)
5419 warning ("`union %s' declared inside parameter list",
5420 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5422 warning ("`enum %s' declared inside parameter list",
5423 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5427 /* For translation these need to be separate warnings */
5428 if (code
== RECORD_TYPE
)
5429 warning ("anonymous struct declared inside parameter list");
5430 else if (code
== UNION_TYPE
)
5431 warning ("anonymous union declared inside parameter list");
5433 warning ("anonymous enum declared inside parameter list");
5437 warning ("its scope is only this definition or declaration, which is probably not what you want");
5443 /* Get the struct, enum or union (CODE says which) with tag NAME.
5444 Define the tag as a forward-reference if it is not defined. */
5447 xref_tag (code
, name
)
5448 enum tree_code code
;
5451 /* If a cross reference is requested, look up the type
5452 already defined for this tag and return it. */
5454 tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5455 /* If this is the right type of tag, return what we found.
5456 (This reference will be shadowed by shadow_tag later if appropriate.)
5457 If this is the wrong type of tag, do not return it. If it was the
5458 wrong type in the same binding level, we will have had an error
5459 message already; if in a different binding level and declaring
5460 a name, pending_xref_error will give an error message; but if in a
5461 different binding level and not declaring a name, this tag should
5462 shadow the previous declaration of a different type of tag, and
5463 this would not work properly if we return the reference found.
5464 (For example, with "struct foo" in an outer scope, "union foo;"
5465 must shadow that tag with a new one of union type.) */
5466 if (ref
&& TREE_CODE (ref
) == code
)
5469 /* If no such tag is yet defined, create a forward-reference node
5470 and record it as the "definition".
5471 When a real declaration of this type is found,
5472 the forward-reference will be altered into a real type. */
5474 ref
= make_node (code
);
5475 if (code
== ENUMERAL_TYPE
)
5477 /* Give the type a default layout like unsigned int
5478 to avoid crashing if it does not get defined. */
5479 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5480 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5481 TYPE_USER_ALIGN (ref
) = 0;
5482 TREE_UNSIGNED (ref
) = 1;
5483 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5484 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5485 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5488 pushtag (name
, ref
);
5493 /* Make sure that the tag NAME is defined *in the current binding level*
5494 at least as a forward reference.
5495 CODE says which kind of tag NAME ought to be. */
5498 start_struct (code
, name
)
5499 enum tree_code code
;
5502 /* If there is already a tag defined at this binding level
5503 (as a forward reference), just return it. */
5508 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5509 if (ref
&& TREE_CODE (ref
) == code
)
5511 C_TYPE_BEING_DEFINED (ref
) = 1;
5512 TYPE_PACKED (ref
) = flag_pack_struct
;
5513 if (TYPE_FIELDS (ref
))
5515 if (code
== UNION_TYPE
)
5516 error ("redefinition of `union %s'",
5517 IDENTIFIER_POINTER (name
));
5519 error ("redefinition of `struct %s'",
5520 IDENTIFIER_POINTER (name
));
5526 /* Otherwise create a forward-reference just so the tag is in scope. */
5528 ref
= make_node (code
);
5529 pushtag (name
, ref
);
5530 C_TYPE_BEING_DEFINED (ref
) = 1;
5531 TYPE_PACKED (ref
) = flag_pack_struct
;
5535 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5536 of a structure component, returning a FIELD_DECL node.
5537 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5539 This is done during the parsing of the struct declaration.
5540 The FIELD_DECL nodes are chained together and the lot of them
5541 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5544 grokfield (filename
, line
, declarator
, declspecs
, width
)
5545 const char *filename ATTRIBUTE_UNUSED
;
5546 int line ATTRIBUTE_UNUSED
;
5547 tree declarator
, declspecs
, width
;
5551 if (declarator
== NULL_TREE
&& width
== NULL_TREE
)
5553 /* This is an unnamed decl. We only support unnamed
5554 structs/unions, so check for other things and refuse them. */
5555 if (TREE_CODE (TREE_VALUE (declspecs
)) != RECORD_TYPE
5556 && TREE_CODE (TREE_VALUE (declspecs
)) != UNION_TYPE
)
5558 error ("unnamed fields of type other than struct or union are not allowed");
5563 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5565 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5566 DECL_INITIAL (value
) = width
;
5568 maybe_objc_check_decl (value
);
5572 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5573 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5574 ATTRIBUTES are attributes to be applied to the structure. */
5577 finish_struct (t
, fieldlist
, attributes
)
5583 int toplevel
= global_binding_level
== current_binding_level
;
5584 int saw_named_field
;
5586 /* If this type was previously laid out as a forward reference,
5587 make sure we lay it out again. */
5591 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5593 /* Nameless union parm types are useful as GCC extension. */
5594 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5595 /* Otherwise, warn about any struct or union def. in parmlist. */
5596 if (in_parm_level_p ())
5599 pedwarn ("%s defined inside parms",
5600 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
5601 else if (! flag_traditional
)
5602 warning ("%s defined inside parms",
5603 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
5608 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5609 if (DECL_NAME (x
) != 0)
5613 pedwarn ("%s has no %s",
5614 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
5615 fieldlist
? _("named members") : _("members"));
5618 /* Install struct as DECL_CONTEXT of each field decl.
5619 Also process specified field sizes,m which is found in the DECL_INITIAL.
5620 Store 0 there, except for ": 0" fields (so we can find them
5621 and delete them, below). */
5623 saw_named_field
= 0;
5624 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5626 DECL_CONTEXT (x
) = t
;
5627 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5629 /* If any field is const, the structure type is pseudo-const. */
5630 if (TREE_READONLY (x
))
5631 C_TYPE_FIELDS_READONLY (t
) = 1;
5634 /* A field that is pseudo-const makes the structure likewise. */
5635 tree t1
= TREE_TYPE (x
);
5636 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5637 t1
= TREE_TYPE (t1
);
5638 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5639 && C_TYPE_FIELDS_READONLY (t1
))
5640 C_TYPE_FIELDS_READONLY (t
) = 1;
5643 /* Any field that is volatile means variables of this type must be
5644 treated in some ways as volatile. */
5645 if (TREE_THIS_VOLATILE (x
))
5646 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5648 /* Any field of nominal variable size implies structure is too. */
5649 if (C_DECL_VARIABLE_SIZE (x
))
5650 C_TYPE_VARIABLE_SIZE (t
) = 1;
5652 /* Detect invalid nested redefinition. */
5653 if (TREE_TYPE (x
) == t
)
5654 error ("nested redefinition of `%s'",
5655 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5657 /* Detect invalid bit-field size. */
5658 if (DECL_INITIAL (x
))
5659 STRIP_NOPS (DECL_INITIAL (x
));
5660 if (DECL_INITIAL (x
))
5662 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5663 constant_expression_warning (DECL_INITIAL (x
));
5667 "bit-field `%s' width not an integer constant");
5668 DECL_INITIAL (x
) = NULL
;
5672 /* Detect invalid bit-field type. */
5673 if (DECL_INITIAL (x
)
5674 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5675 && TREE_CODE (TREE_TYPE (x
)) != BOOLEAN_TYPE
5676 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5678 error_with_decl (x
, "bit-field `%s' has invalid type");
5679 DECL_INITIAL (x
) = NULL
;
5682 if (DECL_INITIAL (x
) && pedantic
5683 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5684 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5685 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != c_bool_type_node
5686 /* Accept an enum that's equivalent to int or unsigned int. */
5687 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5688 && (TYPE_PRECISION (TREE_TYPE (x
))
5689 == TYPE_PRECISION (integer_type_node
))))
5690 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ISO C");
5692 /* Detect and ignore out of range field width and process valid
5694 if (DECL_INITIAL (x
))
5697 if (TYPE_MAIN_VARIANT (TREE_TYPE (x
)) == c_bool_type_node
)
5698 max_width
= CHAR_TYPE_SIZE
;
5700 max_width
= TYPE_PRECISION (TREE_TYPE (x
));
5701 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5702 error_with_decl (x
, "negative width in bit-field `%s'");
5703 else if (0 < compare_tree_int (DECL_INITIAL (x
), max_width
))
5704 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5705 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5706 error_with_decl (x
, "zero width for bit-field `%s'");
5709 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5710 unsigned HOST_WIDE_INT width
5711 = TREE_INT_CST_LOW (DECL_INITIAL (x
));
5713 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5714 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5715 TREE_UNSIGNED (TREE_TYPE (x
)))
5717 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5718 TREE_UNSIGNED (TREE_TYPE (x
))))))
5719 warning_with_decl (x
,
5720 "`%s' is narrower than values of its type");
5722 DECL_SIZE (x
) = bitsize_int (width
);
5723 DECL_BIT_FIELD (x
) = 1;
5724 SET_DECL_C_BIT_FIELD (x
);
5728 /* field size 0 => force desired amount of alignment. */
5729 #ifdef EMPTY_FIELD_BOUNDARY
5730 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5732 #ifdef PCC_BITFIELD_TYPE_MATTERS
5733 if (PCC_BITFIELD_TYPE_MATTERS
)
5735 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5736 TYPE_ALIGN (TREE_TYPE (x
)));
5737 DECL_USER_ALIGN (x
) |= TYPE_USER_ALIGN (TREE_TYPE (x
));
5744 else if (TREE_TYPE (x
) != error_mark_node
)
5746 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5747 : TYPE_ALIGN (TREE_TYPE (x
)));
5749 /* Non-bit-fields are aligned for their type, except packed
5750 fields which require only BITS_PER_UNIT alignment. */
5751 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5752 if (! DECL_PACKED (x
))
5753 DECL_USER_ALIGN (x
) |= TYPE_USER_ALIGN (TREE_TYPE (x
));
5756 DECL_INITIAL (x
) = 0;
5758 /* Detect flexible array member in an invalid context. */
5759 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5760 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5761 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5762 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5764 if (TREE_CODE (t
) == UNION_TYPE
)
5765 error_with_decl (x
, "flexible array member in union");
5766 else if (TREE_CHAIN (x
) != NULL_TREE
)
5767 error_with_decl (x
, "flexible array member not at end of struct");
5768 else if (! saw_named_field
)
5769 error_with_decl (x
, "flexible array member in otherwise empty struct");
5772 saw_named_field
= 1;
5775 /* Delete all duplicate fields from the fieldlist */
5776 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5777 /* Anonymous fields aren't duplicates. */
5778 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5786 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5792 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5794 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5795 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5801 /* Now we have the nearly final fieldlist. Record it,
5802 then lay out the structure or union (including the fields). */
5804 TYPE_FIELDS (t
) = fieldlist
;
5808 /* Delete all zero-width bit-fields from the fieldlist */
5810 tree
*fieldlistp
= &fieldlist
;
5812 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5813 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5815 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5818 /* Now we have the truly final field list.
5819 Store it in this type and in the variants. */
5821 TYPE_FIELDS (t
) = fieldlist
;
5823 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5825 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5826 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5827 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5828 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5831 /* If this was supposed to be a transparent union, but we can't
5832 make it one, warn and turn off the flag. */
5833 if (TREE_CODE (t
) == UNION_TYPE
5834 && TYPE_TRANSPARENT_UNION (t
)
5835 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5837 TYPE_TRANSPARENT_UNION (t
) = 0;
5838 warning ("union cannot be made transparent");
5841 /* If this structure or union completes the type of any previous
5842 variable declaration, lay it out and output its rtl. */
5844 if (current_binding_level
->n_incomplete
!= 0)
5847 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5849 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl
)) == TYPE_MAIN_VARIANT (t
)
5850 && TREE_CODE (decl
) != TYPE_DECL
)
5852 layout_decl (decl
, 0);
5853 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5854 maybe_objc_check_decl (decl
);
5855 rest_of_decl_compilation (decl
, NULL
, toplevel
, 0);
5858 if (--current_binding_level
->n_incomplete
== 0)
5861 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5862 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5864 tree element
= TREE_TYPE (decl
);
5865 while (TREE_CODE (element
) == ARRAY_TYPE
)
5866 element
= TREE_TYPE (element
);
5869 layout_array_type (TREE_TYPE (decl
));
5870 if (TREE_CODE (decl
) != TYPE_DECL
)
5872 layout_decl (decl
, 0);
5873 maybe_objc_check_decl (decl
);
5874 rest_of_decl_compilation (decl
, NULL
, toplevel
, 0);
5878 if (--current_binding_level
->n_incomplete
== 0)
5885 /* Finish debugging output for this type. */
5886 rest_of_type_compilation (t
, toplevel
);
5891 /* Lay out the type T, and its element type, and so on. */
5894 layout_array_type (t
)
5897 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5898 layout_array_type (TREE_TYPE (t
));
5902 /* Begin compiling the definition of an enumeration type.
5903 NAME is its name (or null if anonymous).
5904 Returns the type object, as yet incomplete.
5905 Also records info about it so that build_enumerator
5906 may be used to declare the individual values as they are read. */
5914 /* If this is the real definition for a previous forward reference,
5915 fill in the contents in the same object that used to be the
5916 forward reference. */
5919 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5921 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5923 enumtype
= make_node (ENUMERAL_TYPE
);
5924 pushtag (name
, enumtype
);
5927 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5929 if (TYPE_VALUES (enumtype
) != 0)
5931 /* This enum is a named one that has been declared already. */
5932 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5934 /* Completely replace its old definition.
5935 The old enumerators remain defined, however. */
5936 TYPE_VALUES (enumtype
) = 0;
5939 enum_next_value
= integer_zero_node
;
5942 if (flag_short_enums
)
5943 TYPE_PACKED (enumtype
) = 1;
5948 /* After processing and defining all the values of an enumeration type,
5949 install their decls in the enumeration type and finish it off.
5950 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5951 and ATTRIBUTES are the specified attributes.
5952 Returns ENUMTYPE. */
5955 finish_enum (enumtype
, values
, attributes
)
5961 tree minnode
= 0, maxnode
= 0, enum_value_type
;
5962 int precision
, unsign
;
5963 int toplevel
= (global_binding_level
== current_binding_level
);
5965 if (in_parm_level_p ())
5966 warning ("enum defined inside parms");
5968 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5970 /* Calculate the maximum value of any enumerator in this type. */
5972 if (values
== error_mark_node
)
5973 minnode
= maxnode
= integer_zero_node
;
5976 minnode
= maxnode
= TREE_VALUE (values
);
5977 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5979 tree value
= TREE_VALUE (pair
);
5980 if (tree_int_cst_lt (maxnode
, value
))
5982 if (tree_int_cst_lt (value
, minnode
))
5987 /* Construct the final type of this enumeration. It is the same
5988 as one of the integral types - the narrowest one that fits, except
5989 that normally we only go as narrow as int - and signed iff any of
5990 the values are negative. */
5991 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5992 precision
= MAX (min_precision (minnode
, unsign
),
5993 min_precision (maxnode
, unsign
));
5994 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5996 tree narrowest
= type_for_size (precision
, unsign
);
5999 warning ("enumeration values exceed range of largest integer");
6000 narrowest
= long_long_integer_type_node
;
6003 precision
= TYPE_PRECISION (narrowest
);
6006 precision
= TYPE_PRECISION (integer_type_node
);
6008 if (precision
== TYPE_PRECISION (integer_type_node
))
6009 enum_value_type
= type_for_size (precision
, 0);
6011 enum_value_type
= enumtype
;
6013 TYPE_MIN_VALUE (enumtype
) = minnode
;
6014 TYPE_MAX_VALUE (enumtype
) = maxnode
;
6015 TYPE_PRECISION (enumtype
) = precision
;
6016 TREE_UNSIGNED (enumtype
) = unsign
;
6017 TYPE_SIZE (enumtype
) = 0;
6018 layout_type (enumtype
);
6020 if (values
!= error_mark_node
)
6022 /* Change the type of the enumerators to be the enum type. We
6023 need to do this irrespective of the size of the enum, for
6024 proper type checking. Replace the DECL_INITIALs of the
6025 enumerators, and the value slots of the list, with copies
6026 that have the enum type; they cannot be modified in place
6027 because they may be shared (e.g. integer_zero_node) Finally,
6028 change the purpose slots to point to the names of the decls. */
6029 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6031 tree enu
= TREE_PURPOSE (pair
);
6033 TREE_TYPE (enu
) = enumtype
;
6034 DECL_SIZE (enu
) = TYPE_SIZE (enumtype
);
6035 DECL_SIZE_UNIT (enu
) = TYPE_SIZE_UNIT (enumtype
);
6036 DECL_ALIGN (enu
) = TYPE_ALIGN (enumtype
);
6037 DECL_USER_ALIGN (enu
) = TYPE_USER_ALIGN (enumtype
);
6038 DECL_MODE (enu
) = TYPE_MODE (enumtype
);
6040 /* The ISO C Standard mandates enumerators to have type int,
6041 even though the underlying type of an enum type is
6042 unspecified. Here we convert any enumerators that fit in
6043 an int to type int, to avoid promotions to unsigned types
6044 when comparing integers with enumerators that fit in the
6045 int range. When -pedantic is given, build_enumerator()
6046 would have already taken care of those that don't fit. */
6047 if (int_fits_type_p (DECL_INITIAL (enu
), enum_value_type
))
6048 DECL_INITIAL (enu
) = convert (enum_value_type
, DECL_INITIAL (enu
));
6050 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
6052 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
6053 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
6056 TYPE_VALUES (enumtype
) = values
;
6059 /* Fix up all variant types of this enum type. */
6060 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
6062 if (tem
== enumtype
)
6064 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
6065 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
6066 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
6067 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
6068 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
6069 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
6070 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
6071 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
6072 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
6073 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
6076 /* Finish debugging output for this type. */
6077 rest_of_type_compilation (enumtype
, toplevel
);
6082 /* Build and install a CONST_DECL for one value of the
6083 current enumeration type (one that was begun with start_enum).
6084 Return a tree-list containing the CONST_DECL and its value.
6085 Assignment of sequential values by default is handled here. */
6088 build_enumerator (name
, value
)
6093 /* Validate and default VALUE. */
6095 /* Remove no-op casts from the value. */
6097 STRIP_TYPE_NOPS (value
);
6101 if (TREE_CODE (value
) == INTEGER_CST
)
6103 value
= default_conversion (value
);
6104 constant_expression_warning (value
);
6108 error ("enumerator value for `%s' not integer constant",
6109 IDENTIFIER_POINTER (name
));
6114 /* Default based on previous value. */
6115 /* It should no longer be possible to have NON_LVALUE_EXPR
6119 value
= enum_next_value
;
6121 error ("overflow in enumeration values");
6124 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
6126 pedwarn ("ISO C restricts enumerator values to range of `int'");
6127 value
= convert (integer_type_node
, value
);
6130 /* Set basis for default for next value. */
6131 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6132 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6134 /* Now create a declaration for the enum value name. */
6136 type
= TREE_TYPE (value
);
6137 type
= type_for_size (MAX (TYPE_PRECISION (type
),
6138 TYPE_PRECISION (integer_type_node
)),
6140 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
6141 && TREE_UNSIGNED (type
)));
6143 decl
= build_decl (CONST_DECL
, name
, type
);
6144 DECL_INITIAL (decl
) = convert (type
, value
);
6147 return tree_cons (decl
, value
, NULL_TREE
);
6151 /* Create the FUNCTION_DECL for a function definition.
6152 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6153 the declaration; they describe the function's name and the type it returns,
6154 but twisted together in a fashion that parallels the syntax of C.
6156 This function creates a binding context for the function body
6157 as well as setting up the FUNCTION_DECL in current_function_decl.
6159 Returns 1 on success. If the DECLARATOR is not suitable for a function
6160 (it defines a datum instead), we return 0, which tells
6161 yyparse to report a parse error. */
6164 start_function (declspecs
, declarator
, attributes
)
6165 tree declarator
, declspecs
, attributes
;
6167 tree decl1
, old_decl
;
6169 int old_immediate_size_expand
= immediate_size_expand
;
6171 current_function_returns_value
= 0; /* Assume, until we see it does. */
6172 current_function_returns_null
= 0;
6173 warn_about_return_type
= 0;
6174 current_extern_inline
= 0;
6175 c_function_varargs
= 0;
6177 shadowed_labels
= 0;
6179 /* Don't expand any sizes in the return type of the function. */
6180 immediate_size_expand
= 0;
6182 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
6184 /* If the declarator is not suitable for a function definition,
6185 cause a syntax error. */
6188 immediate_size_expand
= old_immediate_size_expand
;
6192 decl_attributes (&decl1
, attributes
, 0);
6194 if (DECL_DECLARED_INLINE_P (decl1
)
6195 && DECL_UNINLINABLE (decl1
)
6196 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
6197 warning_with_decl (decl1
,
6198 "inline function `%s' given attribute noinline");
6200 announce_function (decl1
);
6202 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
6204 error ("return type is an incomplete type");
6205 /* Make it return void instead. */
6207 = build_function_type (void_type_node
,
6208 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6211 if (warn_about_return_type
)
6212 pedwarn_c99 ("return type defaults to `int'");
6214 /* Save the parm names or decls from this function's declarator
6215 where store_parm_decls will find them. */
6216 current_function_parms
= last_function_parms
;
6217 current_function_parm_tags
= last_function_parm_tags
;
6219 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6220 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6221 DECL_INITIAL (decl1
) = error_mark_node
;
6223 /* If this definition isn't a prototype and we had a prototype declaration
6224 before, copy the arg type info from that prototype.
6225 But not if what we had before was a builtin function. */
6226 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6227 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6228 && !DECL_BUILT_IN (old_decl
)
6229 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6230 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6231 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6233 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6234 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6235 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6238 /* If there is no explicit declaration, look for any out-of-scope implicit
6241 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6243 /* Optionally warn of old-fashioned def with no previous prototype. */
6244 if (warn_strict_prototypes
6245 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6247 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0
6248 || (DECL_BUILT_IN (old_decl
)
6249 && ! C_DECL_ANTICIPATED (old_decl
)))))
6250 warning ("function declaration isn't a prototype");
6251 /* Optionally warn of any global def with no previous prototype. */
6252 else if (warn_missing_prototypes
6253 && TREE_PUBLIC (decl1
)
6255 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0
6256 || (DECL_BUILT_IN (old_decl
)
6257 && ! C_DECL_ANTICIPATED (old_decl
))))
6258 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
6259 warning_with_decl (decl1
, "no previous prototype for `%s'");
6260 /* Optionally warn of any def with no previous prototype
6261 if the function has already been used. */
6262 else if (warn_missing_prototypes
6263 && old_decl
!= 0 && TREE_USED (old_decl
)
6264 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6265 warning_with_decl (decl1
,
6266 "`%s' was used with no prototype before its definition");
6267 /* Optionally warn of any global def with no previous declaration. */
6268 else if (warn_missing_declarations
6269 && TREE_PUBLIC (decl1
)
6271 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
6272 warning_with_decl (decl1
, "no previous declaration for `%s'");
6273 /* Optionally warn of any def with no previous declaration
6274 if the function has already been used. */
6275 else if (warn_missing_declarations
6276 && old_decl
!= 0 && TREE_USED (old_decl
)
6277 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6278 warning_with_decl (decl1
,
6279 "`%s' was used with no declaration before its definition");
6281 /* This is a definition, not a reference.
6282 So normally clear DECL_EXTERNAL.
6283 However, `extern inline' acts like a declaration
6284 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6285 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6287 /* This function exists in static storage.
6288 (This does not mean `static' in the C sense!) */
6289 TREE_STATIC (decl1
) = 1;
6291 /* A nested function is not global. */
6292 if (current_function_decl
!= 0)
6293 TREE_PUBLIC (decl1
) = 0;
6295 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6296 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
6301 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6302 != integer_type_node
)
6303 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
6305 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6306 args
= TREE_CHAIN (args
))
6308 tree type
= args
? TREE_VALUE (args
) : 0;
6310 if (type
== void_type_node
)
6317 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6318 pedwarn_with_decl (decl1
,
6319 "first argument of `%s' should be `int'");
6323 if (TREE_CODE (type
) != POINTER_TYPE
6324 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6325 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6327 pedwarn_with_decl (decl1
,
6328 "second argument of `%s' should be `char **'");
6332 if (TREE_CODE (type
) != POINTER_TYPE
6333 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6334 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6336 pedwarn_with_decl (decl1
,
6337 "third argument of `%s' should probably be `char **'");
6342 /* It is intentional that this message does not mention the third
6343 argument because it's only mentioned in an appendix of the
6345 if (argct
> 0 && (argct
< 2 || argct
> 3))
6346 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
6348 if (! TREE_PUBLIC (decl1
))
6349 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
6352 /* Record the decl so that the function name is defined.
6353 If we already have a decl for this name, and it is a FUNCTION_DECL,
6354 use the old decl. */
6356 current_function_decl
= pushdecl (decl1
);
6359 declare_parm_level (1);
6360 current_binding_level
->subblocks_tag_transparent
= 1;
6362 make_decl_rtl (current_function_decl
, NULL
);
6364 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6365 /* Promote the value to int before returning it. */
6366 if (c_promoting_integer_type_p (restype
))
6368 /* It retains unsignedness if traditional
6369 or if not really getting wider. */
6370 if (TREE_UNSIGNED (restype
)
6371 && (flag_traditional
6372 || (TYPE_PRECISION (restype
)
6373 == TYPE_PRECISION (integer_type_node
))))
6374 restype
= unsigned_type_node
;
6376 restype
= integer_type_node
;
6378 DECL_RESULT (current_function_decl
)
6379 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6381 /* If this fcn was already referenced via a block-scope `extern' decl
6382 (or an implicit decl), propagate certain information about the usage. */
6383 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6384 TREE_ADDRESSABLE (current_function_decl
) = 1;
6386 immediate_size_expand
= old_immediate_size_expand
;
6388 start_fname_decls ();
6393 /* Record that this function is going to be a varargs function.
6394 This is called before store_parm_decls, which is too early
6395 to call mark_varargs directly. */
6400 c_function_varargs
= 1;
6403 /* Store the parameter declarations into the current function declaration.
6404 This is called after parsing the parameter declarations, before
6405 digesting the body of the function.
6407 For an old-style definition, modify the function's type
6408 to specify at least the number of arguments. */
6413 tree fndecl
= current_function_decl
;
6416 /* This is either a chain of PARM_DECLs (if a prototype was used)
6417 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6418 tree specparms
= current_function_parms
;
6420 /* This is a list of types declared among parms in a prototype. */
6421 tree parmtags
= current_function_parm_tags
;
6423 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6424 tree parmdecls
= getdecls ();
6426 /* This is a chain of any other decls that came in among the parm
6427 declarations. If a parm is declared with enum {foo, bar} x;
6428 then CONST_DECLs for foo and bar are put here. */
6431 /* The function containing FNDECL, if any. */
6432 tree context
= decl_function_context (fndecl
);
6434 /* Nonzero if this definition is written with a prototype. */
6437 int saved_warn_shadow
= warn_shadow
;
6439 /* Don't re-emit shadow warnings. */
6442 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6444 /* This case is when the function was defined with an ANSI prototype.
6445 The parms already have decls, so we need not do anything here
6446 except record them as in effect
6447 and complain if any redundant old-style parm decls were written. */
6458 error_with_decl (fndecl
,
6459 "parm types given both in parmlist and separately");
6460 /* Get rid of the erroneous decls; don't keep them on
6461 the list of parms, since they might not be PARM_DECLs. */
6462 for (decl
= current_binding_level
->names
;
6463 decl
; decl
= TREE_CHAIN (decl
))
6464 if (DECL_NAME (decl
))
6465 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6466 for (link
= current_binding_level
->shadowed
;
6467 link
; link
= TREE_CHAIN (link
))
6468 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6469 current_binding_level
->names
= 0;
6470 current_binding_level
->shadowed
= 0;
6473 specparms
= nreverse (specparms
);
6474 for (parm
= specparms
; parm
; parm
= next
)
6476 next
= TREE_CHAIN (parm
);
6477 if (TREE_CODE (parm
) == PARM_DECL
)
6479 if (DECL_NAME (parm
) == 0)
6480 error_with_decl (parm
, "parameter name omitted");
6481 else if (TREE_CODE (TREE_TYPE (parm
)) != ERROR_MARK
6482 && VOID_TYPE_P (TREE_TYPE (parm
)))
6484 error_with_decl (parm
, "parameter `%s' declared void");
6485 /* Change the type to error_mark_node so this parameter
6486 will be ignored by assign_parms. */
6487 TREE_TYPE (parm
) = error_mark_node
;
6493 /* If we find an enum constant or a type tag,
6494 put it aside for the moment. */
6495 TREE_CHAIN (parm
) = 0;
6496 others
= chainon (others
, parm
);
6500 /* Get the decls in their original chain order
6501 and record in the function. */
6502 DECL_ARGUMENTS (fndecl
) = getdecls ();
6505 /* If this function takes a variable number of arguments,
6506 add a phony parameter to the end of the parm list,
6507 to represent the position of the first unnamed argument. */
6508 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6511 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6512 /* Let's hope the address of the unnamed parm
6513 won't depend on its type. */
6514 TREE_TYPE (dummy
) = integer_type_node
;
6515 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6516 DECL_ARGUMENTS (fndecl
) = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6520 /* Now pushdecl the enum constants. */
6521 for (parm
= others
; parm
; parm
= next
)
6523 next
= TREE_CHAIN (parm
);
6524 if (DECL_NAME (parm
) == 0)
6526 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6528 else if (TREE_CODE (parm
) != PARM_DECL
)
6532 storetags (chainon (parmtags
, gettags ()));
6536 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6537 each with a parm name as the TREE_VALUE.
6539 PARMDECLS is a chain of declarations for parameters.
6540 Warning! It can also contain CONST_DECLs which are not parameters
6541 but are names of enumerators of any enum types
6542 declared among the parameters.
6544 First match each formal parameter name with its declaration.
6545 Associate decls with the names and store the decls
6546 into the TREE_PURPOSE slots. */
6548 /* We use DECL_WEAK as a flag to show which parameters have been
6549 seen already since it is not used on PARM_DECL or CONST_DECL. */
6550 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6551 DECL_WEAK (parm
) = 0;
6553 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6555 tree tail
, found
= NULL
;
6557 if (TREE_VALUE (parm
) == 0)
6559 error_with_decl (fndecl
,
6560 "parameter name missing from parameter list");
6561 TREE_PURPOSE (parm
) = 0;
6565 /* See if any of the parmdecls specifies this parm by name.
6566 Ignore any enumerator decls. */
6567 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6568 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6569 && TREE_CODE (tail
) == PARM_DECL
)
6575 /* If declaration already marked, we have a duplicate name.
6576 Complain, and don't use this decl twice. */
6577 if (found
&& DECL_WEAK (found
))
6579 error_with_decl (found
, "multiple parameters named `%s'");
6583 /* If the declaration says "void", complain and ignore it. */
6584 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6586 error_with_decl (found
, "parameter `%s' declared void");
6587 TREE_TYPE (found
) = integer_type_node
;
6588 DECL_ARG_TYPE (found
) = integer_type_node
;
6589 layout_decl (found
, 0);
6592 /* Traditionally, a parm declared float is actually a double. */
6593 if (found
&& flag_traditional
6594 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6596 TREE_TYPE (found
) = double_type_node
;
6597 DECL_ARG_TYPE (found
) = double_type_node
;
6598 layout_decl (found
, 0);
6601 /* If no declaration found, default to int. */
6604 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6606 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6607 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6608 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6610 pedwarn_with_decl (found
, "type of `%s' defaults to `int'");
6611 else if (extra_warnings
)
6612 warning_with_decl (found
, "type of `%s' defaults to `int'");
6616 TREE_PURPOSE (parm
) = found
;
6618 /* Mark this decl as "already found". */
6619 DECL_WEAK (found
) = 1;
6622 /* Put anything which is on the parmdecls chain and which is
6623 not a PARM_DECL onto the list NONPARMS. (The types of
6624 non-parm things which might appear on the list include
6625 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6626 any actual PARM_DECLs not matched with any names. */
6629 for (parm
= parmdecls
; parm
;)
6631 tree next
= TREE_CHAIN (parm
);
6632 TREE_CHAIN (parm
) = 0;
6634 if (TREE_CODE (parm
) != PARM_DECL
)
6635 nonparms
= chainon (nonparms
, parm
);
6638 /* Complain about args with incomplete types. */
6639 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6641 error_with_decl (parm
, "parameter `%s' has incomplete type");
6642 TREE_TYPE (parm
) = error_mark_node
;
6645 if (! DECL_WEAK (parm
))
6647 error_with_decl (parm
,
6648 "declaration for parameter `%s' but no such parameter");
6649 /* Pretend the parameter was not missing.
6650 This gets us to a standard state and minimizes
6651 further error messages. */
6653 = chainon (specparms
,
6654 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6661 /* Chain the declarations together in the order of the list of
6662 names. Store that chain in the function decl, replacing the
6665 DECL_ARGUMENTS (fndecl
) = 0;
6668 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6669 if (TREE_PURPOSE (parm
))
6672 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6674 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6675 last
= TREE_PURPOSE (parm
);
6676 TREE_CHAIN (last
) = 0;
6680 /* If there was a previous prototype,
6681 set the DECL_ARG_TYPE of each argument according to
6682 the type previously specified, and report any mismatches. */
6684 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6687 for (parm
= DECL_ARGUMENTS (fndecl
),
6688 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6689 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6690 != void_type_node
));
6691 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6693 if (parm
== 0 || type
== 0
6694 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6696 error ("number of arguments doesn't match prototype");
6697 error_with_file_and_line (current_function_prototype_file
,
6698 current_function_prototype_line
,
6699 "prototype declaration");
6702 /* Type for passing arg must be consistent with that
6703 declared for the arg. ISO C says we take the unqualified
6704 type for parameters declared with qualified type. */
6705 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6706 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6708 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6709 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6711 /* Adjust argument to match prototype. E.g. a previous
6712 `int foo(float);' prototype causes
6713 `int foo(x) float x; {...}' to be treated like
6714 `int foo(float x) {...}'. This is particularly
6715 useful for argument types like uid_t. */
6716 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6718 if (PROMOTE_PROTOTYPES
6719 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6720 && TYPE_PRECISION (TREE_TYPE (parm
))
6721 < TYPE_PRECISION (integer_type_node
))
6722 DECL_ARG_TYPE (parm
) = integer_type_node
;
6726 pedwarn ("promoted argument `%s' doesn't match prototype",
6727 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6728 warning_with_file_and_line
6729 (current_function_prototype_file
,
6730 current_function_prototype_line
,
6731 "prototype declaration");
6734 /* If -traditional, allow `int' argument to match
6735 `unsigned' prototype. */
6736 else if (! (flag_traditional
6737 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6738 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6740 error ("argument `%s' doesn't match prototype",
6741 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6742 error_with_file_and_line (current_function_prototype_file
,
6743 current_function_prototype_line
,
6744 "prototype declaration");
6748 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6751 /* Otherwise, create a prototype that would match. */
6755 tree actual
= 0, last
= 0, type
;
6757 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6759 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6761 TREE_CHAIN (last
) = type
;
6766 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6768 TREE_CHAIN (last
) = type
;
6772 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6773 of the type of this function, but we need to avoid having this
6774 affect the types of other similarly-typed functions, so we must
6775 first force the generation of an identical (but separate) type
6776 node for the relevant function type. The new node we create
6777 will be a variant of the main variant of the original function
6780 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6782 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6785 /* Now store the final chain of decls for the arguments
6786 as the decl-chain of the current lexical scope.
6787 Put the enumerators in as well, at the front so that
6788 DECL_ARGUMENTS is not modified. */
6790 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6793 /* Make sure the binding level for the top of the function body
6794 gets a BLOCK if there are any in the function.
6795 Otherwise, the dbx output is wrong. */
6797 keep_next_if_subblocks
= 1;
6799 /* ??? This might be an improvement,
6800 but needs to be thought about some more. */
6802 keep_next_level_flag
= 1;
6805 /* Write a record describing this function definition to the prototypes
6806 file (if requested). */
6808 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6810 /* Initialize the RTL code for the function. */
6811 init_function_start (fndecl
, input_filename
, lineno
);
6813 /* Begin the statement tree for this function. */
6814 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl
));
6816 /* If this is a nested function, save away the sizes of any
6817 variable-size types so that we can expand them when generating
6823 DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
6824 = nreverse (get_pending_sizes ());
6825 for (t
= DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
;
6828 SAVE_EXPR_CONTEXT (TREE_VALUE (t
)) = context
;
6831 /* This function is being processed in whole-function mode. */
6832 cfun
->x_whole_function_mode_p
= 1;
6834 /* Even though we're inside a function body, we still don't want to
6835 call expand_expr to calculate the size of a variable-sized array.
6836 We haven't necessarily assigned RTL to all variables yet, so it's
6837 not safe to try to expand expressions involving them. */
6838 immediate_size_expand
= 0;
6839 cfun
->x_dont_save_pending_sizes_p
= 1;
6841 warn_shadow
= saved_warn_shadow
;
6844 /* Finish up a function declaration and compile that function
6845 all the way to assembler language output. The free the storage
6846 for the function definition.
6848 This is called after parsing the body of the function definition.
6850 NESTED is nonzero if the function being finished is nested in another. */
6853 finish_function (nested
)
6856 tree fndecl
= current_function_decl
;
6858 /* TREE_READONLY (fndecl) = 1;
6859 This caused &foo to be of type ptr-to-const-function
6860 which then got a warning when stored in a ptr-to-function variable. */
6863 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6865 /* Must mark the RESULT_DECL as being in this function. */
6867 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6869 /* Obey `register' declarations if `setjmp' is called in this fn. */
6870 if (flag_traditional
&& current_function_calls_setjmp
)
6872 setjmp_protect (DECL_INITIAL (fndecl
));
6873 setjmp_protect_args ();
6876 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6878 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6879 != integer_type_node
)
6881 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6882 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6884 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6888 #ifdef DEFAULT_MAIN_RETURN
6889 /* Make it so that `main' always returns success by default. */
6890 DEFAULT_MAIN_RETURN
;
6893 c_expand_return (integer_zero_node
);
6898 finish_fname_decls ();
6900 /* Tie off the statement tree for this function. */
6901 finish_stmt_tree (&DECL_SAVED_TREE (fndecl
));
6902 /* Clear out memory we no longer need. */
6903 free_after_parsing (cfun
);
6904 /* Since we never call rest_of_compilation, we never clear
6905 CFUN. Do so explicitly. */
6906 free_after_compilation (cfun
);
6911 /* Generate RTL for the body of this function. */
6912 c_expand_body (fndecl
, nested
, 1);
6913 /* Let the error reporting routines know that we're outside a
6914 function. For a nested function, this value is used in
6915 pop_c_function_context and then reset via pop_function_context. */
6916 current_function_decl
= NULL
;
6920 /* Generate the RTL for a deferred function FNDECL. */
6923 c_expand_deferred_function (fndecl
)
6926 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6927 function was deferred, e.g. in duplicate_decls. */
6928 if (DECL_INLINE (fndecl
) && DECL_RESULT (fndecl
))
6930 c_expand_body (fndecl
, 0, 0);
6931 current_function_decl
= NULL
;
6935 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6936 then we are already in the process of generating RTL for another
6937 function. If can_defer_p is zero, we won't attempt to defer the
6938 generation of RTL. */
6941 c_expand_body (fndecl
, nested_p
, can_defer_p
)
6943 int nested_p
, can_defer_p
;
6945 int uninlinable
= 1;
6947 /* There's no reason to do any of the work here if we're only doing
6948 semantic analysis; this code just generates RTL. */
6949 if (flag_syntax_only
)
6952 if (flag_inline_trees
)
6954 /* First, cache whether the current function is inlinable. Some
6955 predicates depend on cfun and current_function_decl to
6956 function completely. */
6957 timevar_push (TV_INTEGRATION
);
6958 uninlinable
= ! tree_inlinable_function_p (fndecl
);
6960 if (! uninlinable
&& can_defer_p
6961 /* Save function tree for inlining. Should return 0 if the
6962 language does not support function deferring or the
6963 function could not be deferred. */
6964 && defer_fn (fndecl
))
6966 /* Let the back-end know that this function exists. */
6967 (*debug_hooks
->deferred_inline_function
) (fndecl
);
6968 timevar_pop (TV_INTEGRATION
);
6972 /* Then, inline any functions called in it. */
6973 optimize_inline_calls (fndecl
);
6974 timevar_pop (TV_INTEGRATION
);
6977 timevar_push (TV_EXPAND
);
6981 /* Make sure that we will evaluate variable-sized types involved
6982 in our function's type. */
6983 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
);
6984 /* Squirrel away our current state. */
6985 push_function_context ();
6988 /* Initialize the RTL code for the function. */
6989 current_function_decl
= fndecl
;
6990 init_function_start (fndecl
, input_filename
, DECL_SOURCE_LINE (fndecl
));
6992 /* This function is being processed in whole-function mode. */
6993 cfun
->x_whole_function_mode_p
= 1;
6995 /* Even though we're inside a function body, we still don't want to
6996 call expand_expr to calculate the size of a variable-sized array.
6997 We haven't necessarily assigned RTL to all variables yet, so it's
6998 not safe to try to expand expressions involving them. */
6999 immediate_size_expand
= 0;
7000 cfun
->x_dont_save_pending_sizes_p
= 1;
7002 /* If this is a varargs function, inform function.c. */
7003 if (c_function_varargs
)
7006 /* Set up parameters and prepare for return, for the function. */
7007 expand_function_start (fndecl
, 0);
7009 /* If this function is `main', emit a call to `__main'
7010 to run global initializers, etc. */
7011 if (DECL_NAME (fndecl
)
7012 && MAIN_NAME_P (DECL_NAME (fndecl
))
7013 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
7014 expand_main_function ();
7016 /* Generate the RTL for this function. */
7017 expand_stmt (DECL_SAVED_TREE (fndecl
));
7020 /* Allow the body of the function to be garbage collected. */
7021 DECL_SAVED_TREE (fndecl
) = NULL_TREE
;
7024 /* We hard-wired immediate_size_expand to zero above.
7025 expand_function_end will decrement this variable. So, we set the
7026 variable to one here, so that after the decrement it will remain
7028 immediate_size_expand
= 1;
7030 /* Allow language dialects to perform special processing. */
7031 if (lang_expand_function_end
)
7032 (*lang_expand_function_end
) ();
7034 /* Generate rtl for function exit. */
7035 expand_function_end (input_filename
, lineno
, 0);
7037 /* If this is a nested function, protect the local variables in the stack
7038 above us from being collected while we're compiling this function. */
7040 ggc_push_context ();
7042 /* Run the optimizers and output the assembler code for this function. */
7043 rest_of_compilation (fndecl
);
7045 /* Undo the GC context switch. */
7049 /* With just -W, complain only if function returns both with
7050 and without a value. */
7052 && current_function_returns_value
7053 && current_function_returns_null
)
7054 warning ("this function may return with or without a value");
7056 /* If requested, warn about function definitions where the function will
7057 return a value (usually of some struct or union type) which itself will
7058 take up a lot of stack space. */
7060 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
7062 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
7064 if (ret_type
&& TYPE_SIZE_UNIT (ret_type
)
7065 && TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
7066 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
7069 unsigned int size_as_int
7070 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
7072 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
7073 warning_with_decl (fndecl
,
7074 "size of return value of `%s' is %u bytes",
7077 warning_with_decl (fndecl
,
7078 "size of return value of `%s' is larger than %d bytes",
7083 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested_p
7084 && ! flag_inline_trees
)
7086 /* Stop pointing to the local nodes about to be freed.
7087 But DECL_INITIAL must remain nonzero so we know this
7088 was an actual function definition.
7089 For a nested function, this is done in pop_c_function_context.
7090 If rest_of_compilation set this to 0, leave it 0. */
7091 if (DECL_INITIAL (fndecl
) != 0)
7092 DECL_INITIAL (fndecl
) = error_mark_node
;
7094 DECL_ARGUMENTS (fndecl
) = 0;
7097 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
7099 if (targetm
.have_ctors_dtors
)
7100 (* targetm
.asm_out
.constructor
) (XEXP (DECL_RTL (fndecl
), 0),
7101 DEFAULT_INIT_PRIORITY
);
7103 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
7106 if (DECL_STATIC_DESTRUCTOR (fndecl
))
7108 if (targetm
.have_ctors_dtors
)
7109 (* targetm
.asm_out
.destructor
) (XEXP (DECL_RTL (fndecl
), 0),
7110 DEFAULT_INIT_PRIORITY
);
7112 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
7116 /* Return to the enclosing function. */
7117 pop_function_context ();
7118 timevar_pop (TV_EXPAND
);
7121 /* Check the declarations given in a for-loop for satisfying the C99
7124 check_for_loop_decls ()
7130 /* If we get here, declarations have been used in a for loop without
7131 the C99 for loop scope. This doesn't make much sense, so don't
7133 error ("`for' loop initial declaration used outside C99 mode");
7136 /* C99 subclause 6.8.5 paragraph 3:
7138 [#3] The declaration part of a for statement shall only
7139 declare identifiers for objects having storage class auto or
7142 It isn't clear whether, in this sentence, "identifiers" binds to
7143 "shall only declare" or to "objects" - that is, whether all identifiers
7144 declared must be identifiers for objects, or whether the restriction
7145 only applies to those that are. (A question on this in comp.std.c
7146 in November 2000 received no answer.) We implement the strictest
7147 interpretation, to avoid creating an extension which later causes
7150 for (t
= gettags (); t
; t
= TREE_CHAIN (t
))
7152 if (TREE_PURPOSE (t
) != 0)
7154 enum tree_code code
= TREE_CODE (TREE_VALUE (t
));
7156 if (code
== RECORD_TYPE
)
7157 error ("`struct %s' declared in `for' loop initial declaration",
7158 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
7159 else if (code
== UNION_TYPE
)
7160 error ("`union %s' declared in `for' loop initial declaration",
7161 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
7163 error ("`enum %s' declared in `for' loop initial declaration",
7164 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
7168 for (t
= getdecls (); t
; t
= TREE_CHAIN (t
))
7170 if (TREE_CODE (t
) != VAR_DECL
&& DECL_NAME (t
))
7171 error_with_decl (t
, "declaration of non-variable `%s' in `for' loop initial declaration");
7172 else if (TREE_STATIC (t
))
7173 error_with_decl (t
, "declaration of static variable `%s' in `for' loop initial declaration");
7174 else if (DECL_EXTERNAL (t
))
7175 error_with_decl (t
, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7179 /* Save and restore the variables in this file and elsewhere
7180 that keep track of the progress of compilation of the current function.
7181 Used for nested functions. */
7183 struct c_language_function
7185 struct language_function base
;
7187 tree shadowed_labels
;
7190 int warn_about_return_type
;
7192 struct binding_level
*binding_level
;
7195 /* Save and reinitialize the variables
7196 used during compilation of a C function. */
7199 push_c_function_context (f
)
7202 struct c_language_function
*p
;
7203 p
= ((struct c_language_function
*)
7204 xmalloc (sizeof (struct c_language_function
)));
7205 f
->language
= (struct language_function
*) p
;
7207 p
->base
.x_stmt_tree
= c_stmt_tree
;
7208 p
->base
.x_scope_stmt_stack
= c_scope_stmt_stack
;
7209 p
->named_labels
= named_labels
;
7210 p
->shadowed_labels
= shadowed_labels
;
7211 p
->returns_value
= current_function_returns_value
;
7212 p
->returns_null
= current_function_returns_null
;
7213 p
->warn_about_return_type
= warn_about_return_type
;
7214 p
->extern_inline
= current_extern_inline
;
7215 p
->binding_level
= current_binding_level
;
7218 /* Restore the variables used during compilation of a C function. */
7221 pop_c_function_context (f
)
7224 struct c_language_function
*p
7225 = (struct c_language_function
*) f
->language
;
7228 /* Bring back all the labels that were shadowed. */
7229 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7230 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7231 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7232 = TREE_VALUE (link
);
7234 if (DECL_SAVED_INSNS (current_function_decl
) == 0
7235 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
7237 /* Stop pointing to the local nodes about to be freed. */
7238 /* But DECL_INITIAL must remain nonzero so we know this
7239 was an actual function definition. */
7240 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7241 DECL_ARGUMENTS (current_function_decl
) = 0;
7244 c_stmt_tree
= p
->base
.x_stmt_tree
;
7245 c_scope_stmt_stack
= p
->base
.x_scope_stmt_stack
;
7246 named_labels
= p
->named_labels
;
7247 shadowed_labels
= p
->shadowed_labels
;
7248 current_function_returns_value
= p
->returns_value
;
7249 current_function_returns_null
= p
->returns_null
;
7250 warn_about_return_type
= p
->warn_about_return_type
;
7251 current_extern_inline
= p
->extern_inline
;
7252 current_binding_level
= p
->binding_level
;
7258 /* Mark the language specific parts of F for GC. */
7261 mark_c_function_context (f
)
7264 struct c_language_function
*p
7265 = (struct c_language_function
*) f
->language
;
7270 mark_c_language_function (&p
->base
);
7271 ggc_mark_tree (p
->shadowed_labels
);
7272 ggc_mark_tree (p
->named_labels
);
7273 mark_binding_level (&p
->binding_level
);
7276 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7279 copy_lang_decl (decl
)
7282 struct lang_decl
*ld
;
7284 if (!DECL_LANG_SPECIFIC (decl
))
7287 ld
= (struct lang_decl
*) ggc_alloc (sizeof (struct lang_decl
));
7288 memcpy ((char *) ld
, (char *) DECL_LANG_SPECIFIC (decl
),
7289 sizeof (struct lang_decl
));
7290 DECL_LANG_SPECIFIC (decl
) = ld
;
7293 /* Mark the language specific bits in T for GC. */
7299 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
7301 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
7302 ggc_mark_tree (i
->global_value
);
7303 ggc_mark_tree (i
->local_value
);
7304 ggc_mark_tree (i
->label_value
);
7305 ggc_mark_tree (i
->implicit_decl
);
7306 ggc_mark_tree (i
->error_locus
);
7307 ggc_mark_tree (i
->limbo_value
);
7309 else if (TYPE_P (t
) && TYPE_LANG_SPECIFIC (t
))
7310 ggc_mark (TYPE_LANG_SPECIFIC (t
));
7311 else if (DECL_P (t
) && DECL_LANG_SPECIFIC (t
))
7313 ggc_mark (DECL_LANG_SPECIFIC (t
));
7314 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t
)->base
);
7315 ggc_mark_tree (DECL_LANG_SPECIFIC (t
)->pending_sizes
);
7319 /* The functions below are required for functionality of doing
7320 function at once processing in the C front end. Currently these
7321 functions are not called from anywhere in the C front end, but as
7322 these changes continue, that will change. */
7324 /* Returns non-zero if the current statement is a full expression,
7325 i.e. temporaries created during that statement should be destroyed
7326 at the end of the statement. */
7329 stmts_are_full_exprs_p ()
7334 /* Returns the stmt_tree (if any) to which statements are currently
7335 being added. If there is no active statement-tree, NULL is
7339 current_stmt_tree ()
7341 return &c_stmt_tree
;
7344 /* Returns the stack of SCOPE_STMTs for the current function. */
7347 current_scope_stmt_stack ()
7349 return &c_scope_stmt_stack
;
7352 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7356 anon_aggr_type_p (node
)
7357 tree node ATTRIBUTE_UNUSED
;
7362 /* Dummy function in place of callback used by C++. */
7365 extract_interface_info ()
7369 /* Return a new COMPOUND_STMT, after adding it to the current
7373 c_begin_compound_stmt ()
7377 /* Create the COMPOUND_STMT. */
7378 stmt
= add_stmt (build_stmt (COMPOUND_STMT
, NULL_TREE
));
7383 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7387 c_expand_decl_stmt (t
)
7390 tree decl
= DECL_STMT_DECL (t
);
7392 /* Expand nested functions. */
7393 if (TREE_CODE (decl
) == FUNCTION_DECL
7394 && DECL_CONTEXT (decl
) == current_function_decl
7395 && DECL_SAVED_TREE (decl
))
7396 c_expand_body (decl
, /*nested_p=*/1, /*can_defer_p=*/0);
7399 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7400 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7403 identifier_global_value (t
)
7406 return IDENTIFIER_GLOBAL_VALUE (t
);
7409 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7410 otherwise the name is found in ridpointers from RID_INDEX. */
7413 record_builtin_type (rid_index
, name
, type
)
7420 id
= ridpointers
[(int) rid_index
];
7422 id
= get_identifier (name
);
7423 pushdecl (build_decl (TYPE_DECL
, id
, type
));
7426 /* Build the void_list_node (void_type_node having been created). */
7428 build_void_list_node ()
7430 tree t
= build_tree_list (NULL_TREE
, void_type_node
);