1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* Process declarations and symbol lookup for C front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in
;
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) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
80 /* Nonzero if we have seen an invalid cross reference
81 to a struct, union, or enum, but not yet printed the message. */
83 tree pending_invalid_xref
;
84 /* File and line to appear in the eventual error message. */
85 const char *pending_invalid_xref_file
;
86 int pending_invalid_xref_line
;
88 /* While defining an enum type, this is 1 plus the last enumerator
89 constant value. Note that will do not have to save this or `enum_overflow'
90 around nested function definition since such a definition could only
91 occur in an enum value expression and we don't use these variables in
94 static tree enum_next_value
;
96 /* Nonzero means that there was overflow computing enum_next_value. */
98 static int enum_overflow
;
100 /* Parsing a function declarator leaves a list of parameter names
101 or a chain or parameter decls here. */
103 static tree last_function_parms
;
105 /* Parsing a function declarator leaves here a chain of structure
106 and enum types declared in the parmlist. */
108 static tree last_function_parm_tags
;
110 /* After parsing the declarator that starts a function definition,
111 `start_function' puts here the list of parameter names or chain of decls.
112 `store_parm_decls' finds it here. */
114 static tree current_function_parms
;
116 /* Similar, for last_function_parm_tags. */
117 static tree current_function_parm_tags
;
119 /* Similar, for the file and line that the prototype came from if this is
120 an old-style definition. */
121 static const char *current_function_prototype_file
;
122 static int current_function_prototype_line
;
124 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
125 that have names. Here so we can clear out their names' definitions
126 at the end of the function. */
128 static tree named_labels
;
130 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
132 static tree shadowed_labels
;
134 /* Nonzero when store_parm_decls is called indicates a varargs function.
135 Value not meaningful after store_parm_decls. */
137 static int c_function_varargs
;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a return statement that specifies a return value is seen. */
142 int current_function_returns_value
;
144 /* Set to 0 at beginning of a function definition, set to 1 if
145 a return statement with no argument is seen. */
147 int current_function_returns_null
;
149 /* Set to nonzero by `grokdeclarator' for a function
150 whose return type is defaulted, if warnings for this are desired. */
152 static int warn_about_return_type
;
154 /* Nonzero when starting a function declared `extern inline'. */
156 static int current_extern_inline
;
158 /* For each binding contour we allocate a binding_level structure
159 * which records the names defined in that contour.
162 * 1) one for each function definition,
163 * where internal declarations of the parameters appear.
164 * 2) one for each compound statement,
165 * to record its declarations.
167 * The current meaning of a name can be found by searching the levels from
168 * the current one out to the global one.
171 /* Note that the information in the `names' component of the global contour
172 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
176 /* A chain of _DECL nodes for all variables, constants, functions,
177 and typedef types. These are in the reverse of the order supplied.
181 /* A list of structure, union and enum definitions,
182 * for looking up tag names.
183 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
184 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
185 * or ENUMERAL_TYPE node.
189 /* For each level, a list of shadowed outer-level local definitions
190 to be restored when this level is popped.
191 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
192 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
195 /* For each level (except not the global one),
196 a chain of BLOCK nodes for all the levels
197 that were entered and exited one level down. */
200 /* The BLOCK node for this level, if one has been preallocated.
201 If 0, the BLOCK is allocated (if needed) when the level is popped. */
204 /* The binding level which this one is contained in (inherits from). */
205 struct binding_level
*level_chain
;
207 /* Nonzero for the level that holds the parameters of a function. */
210 /* Nonzero if this level "doesn't exist" for tags. */
211 char tag_transparent
;
213 /* Nonzero if sublevels of this level "don't exist" for tags.
214 This is set in the parm level of a function definition
215 while reading the function body, so that the outermost block
216 of the function body will be tag-transparent. */
217 char subblocks_tag_transparent
;
219 /* Nonzero means make a BLOCK for this level regardless of all else. */
222 /* Nonzero means make a BLOCK if this level has any subblocks. */
223 char keep_if_subblocks
;
225 /* Number of decls in `names' that have incomplete
226 structure or union types. */
229 /* A list of decls giving the (reversed) specified order of parms,
230 not including any forward-decls in the parmlist.
231 This is so we can put the parms in proper order for assign_parms. */
235 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
237 /* The binding level currently in effect. */
239 static struct binding_level
*current_binding_level
;
241 /* A chain of binding_level structures awaiting reuse. */
243 static struct binding_level
*free_binding_level
;
245 /* The outermost binding level, for names of file scope.
246 This is created when the compiler is started and exists
247 through the entire run. */
249 static struct binding_level
*global_binding_level
;
251 /* Binding level structures are initialized by copying this one. */
253 static struct binding_level clear_binding_level
254 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
257 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
259 static int keep_next_level_flag
;
261 /* Nonzero means make a BLOCK for the next level pushed
262 if it has subblocks. */
264 static int keep_next_if_subblocks
;
266 /* The chain of outer levels of label scopes.
267 This uses the same data structure used for binding levels,
268 but it works differently: each link in the chain records
269 saved values of named_labels and shadowed_labels for
270 a label binding level outside the current one. */
272 static struct binding_level
*label_level_chain
;
274 /* Functions called automatically at the beginning and end of execution. */
276 tree static_ctors
, static_dtors
;
278 /* Forward declarations. */
280 static struct binding_level
* make_binding_level
PARAMS ((void));
281 static void mark_binding_level
PARAMS ((void *));
282 static void clear_limbo_values
PARAMS ((tree
));
283 static int duplicate_decls
PARAMS ((tree
, tree
, int));
284 static int redeclaration_error_message
PARAMS ((tree
, tree
));
285 static void storedecls
PARAMS ((tree
));
286 static void storetags
PARAMS ((tree
));
287 static tree lookup_tag
PARAMS ((enum tree_code
, tree
,
288 struct binding_level
*, int));
289 static tree lookup_tag_reverse
PARAMS ((tree
));
290 static tree grokdeclarator
PARAMS ((tree
, tree
, enum decl_context
,
292 static tree grokparms
PARAMS ((tree
, int));
293 static void layout_array_type
PARAMS ((tree
));
294 static tree c_make_fname_decl
PARAMS ((tree
, const char *, int));
296 /* C-specific option variables. */
298 /* Nonzero means allow type mismatches in conditional expressions;
299 just make their values `void'. */
301 int flag_cond_mismatch
;
303 /* Nonzero means give `double' the same size as `float'. */
305 int flag_short_double
;
307 /* Nonzero means give `wchar_t' the same size as `short'. */
309 int flag_short_wchar
;
311 /* Nonzero means don't recognize the keyword `asm'. */
315 /* Nonzero means don't recognize any builtin functions. */
319 /* Nonzero means don't recognize the non-ANSI builtin functions.
322 int flag_no_nonansi_builtin
;
324 /* Nonzero means do some things the same way PCC does. */
326 int flag_traditional
;
328 /* Nonzero means use the ISO C99 dialect of C. */
332 /* Nonzero means that we have builtin functions, and main is an int */
336 /* Nonzero means to allow single precision math even if we're generally
337 being traditional. */
338 int flag_allow_single_precision
= 0;
340 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
342 int flag_signed_bitfields
= 1;
343 int explicit_flag_signed_bitfields
= 0;
345 /* Nonzero means warn about use of implicit int. */
347 int warn_implicit_int
;
349 /* Nonzero means warn about usage of long long when `-pedantic'. */
351 int warn_long_long
= 1;
353 /* Nonzero means message about use of implicit function declarations;
354 1 means warning; 2 means error. */
356 int mesg_implicit_function_declaration
;
358 /* Nonzero means give string constants the type `const char *'
359 to get extra warnings from them. These warnings will be too numerous
360 to be useful, except in thoroughly ANSIfied programs. */
362 int flag_const_strings
;
364 /* Nonzero means warn about pointer casts that can drop a type qualifier
365 from the pointer target type. */
369 /* Nonzero means warn when casting a function call to a type that does
370 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
371 when there is no previous declaration of sqrt or malloc. */
373 int warn_bad_function_cast
;
375 /* Warn about functions which might be candidates for attribute noreturn. */
377 int warn_missing_noreturn
;
379 /* Warn about traditional constructs whose meanings changed in ANSI C. */
381 int warn_traditional
;
383 /* Nonzero means warn about sizeof(function) or addition/subtraction
384 of function pointers. */
386 int warn_pointer_arith
;
388 /* Nonzero means warn for non-prototype function decls
389 or non-prototyped defs without previous prototype. */
391 int warn_strict_prototypes
;
393 /* Nonzero means warn for any global function def
394 without separate previous prototype decl. */
396 int warn_missing_prototypes
;
398 /* Nonzero means warn for any global function def
399 without separate previous decl. */
401 int warn_missing_declarations
;
403 /* Nonzero means warn about multiple (redundant) decls for the same single
404 variable or function. */
406 int warn_redundant_decls
= 0;
408 /* Nonzero means warn about extern declarations of objects not at
409 file-scope level and about *all* declarations of functions (whether
410 extern or static) not at file-scope level. Note that we exclude
411 implicit function declarations. To get warnings about those, use
414 int warn_nested_externs
= 0;
416 /* Warn about *printf or *scanf format/argument anomalies. */
420 /* Warn about a subscript that has type char. */
422 int warn_char_subscripts
= 0;
424 /* Warn if a type conversion is done that might have confusing results. */
428 /* Warn if adding () is suggested. */
430 int warn_parentheses
;
432 /* Warn if initializer is not completely bracketed. */
434 int warn_missing_braces
;
436 /* Warn if main is suspicious. */
440 /* Warn about #pragma directives that are not recognised. */
442 int warn_unknown_pragmas
= 0; /* Tri state variable. */
444 /* Warn about comparison of signed and unsigned values.
445 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
447 int warn_sign_compare
= -1;
449 /* Warn about testing equality of floating point numbers. */
451 int warn_float_equal
= 0;
453 /* Nonzero means warn about use of multicharacter literals. */
455 int warn_multichar
= 1;
457 /* Nonzero means `$' can be in an identifier. */
459 #ifndef DOLLARS_IN_IDENTIFIERS
460 #define DOLLARS_IN_IDENTIFIERS 1
462 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
464 /* Decode the string P as a language-specific option for C.
465 Return the number of strings consumed. Should not complain
466 if it does not recognise the option. */
469 c_decode_option (argc
, argv
)
470 int argc ATTRIBUTE_UNUSED
;
473 int strings_processed
;
476 strings_processed
= cpp_handle_option (&parse_in
, argc
, argv
);
478 strings_processed
= 0;
479 #endif /* ! USE_CPPLIB */
481 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
483 flag_traditional
= 1;
484 flag_writable_strings
= 1;
486 else if (!strcmp (p
, "-fallow-single-precision"))
487 flag_allow_single_precision
= 1;
488 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
493 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
497 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
501 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
503 flag_traditional
= 0;
504 flag_writable_strings
= 0;
506 else if (!strncmp (p
, "-std=", 5))
508 /* Select the appropriate language standard. We currently
510 -std=iso9899:1990 same as -ansi
511 -std=iso9899:199409 ISO C as modified in amend. 1
512 -std=iso9899:1999 ISO C 99
513 -std=c89 same as -std=iso9899:1990
514 -std=c99 same as -std=iso9899:1999
515 -std=gnu89 default, iso9899:1990 + gnu extensions
516 -std=gnu99 iso9899:1999 + gnu extensions
518 const char *argstart
= &p
[5];
520 if (!strcmp (argstart
, "iso9899:1990")
521 || !strcmp (argstart
, "c89"))
524 flag_traditional
= 0;
525 flag_writable_strings
= 0;
527 flag_no_nonansi_builtin
= 1;
530 else if (!strcmp (argstart
, "iso9899:199409"))
532 /* ??? The changes since ISO C 1990 are not supported. */
535 else if (!strcmp (argstart
, "iso9899:199x")
536 || !strcmp (argstart
, "iso9899:1999")
537 || !strcmp (argstart
, "c9x")
538 || !strcmp (argstart
, "c99"))
540 flag_traditional
= 0;
541 flag_writable_strings
= 0;
543 flag_no_nonansi_builtin
= 1;
546 else if (!strcmp (argstart
, "gnu89"))
548 flag_traditional
= 0;
549 flag_writable_strings
= 0;
551 flag_no_nonansi_builtin
= 0;
554 else if (!strcmp (argstart
, "gnu9x") || !strcmp (argstart
, "gnu99"))
556 flag_traditional
= 0;
557 flag_writable_strings
= 0;
559 flag_no_nonansi_builtin
= 0;
563 error ("unknown C standard `%s'", argstart
);
565 else if (!strcmp (p
, "-fdollars-in-identifiers"))
566 dollars_in_ident
= 1;
567 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
568 dollars_in_ident
= 0;
569 else if (!strcmp (p
, "-fsigned-char"))
570 flag_signed_char
= 1;
571 else if (!strcmp (p
, "-funsigned-char"))
572 flag_signed_char
= 0;
573 else if (!strcmp (p
, "-fno-signed-char"))
574 flag_signed_char
= 0;
575 else if (!strcmp (p
, "-fno-unsigned-char"))
576 flag_signed_char
= 1;
577 else if (!strcmp (p
, "-fsigned-bitfields")
578 || !strcmp (p
, "-fno-unsigned-bitfields"))
580 flag_signed_bitfields
= 1;
581 explicit_flag_signed_bitfields
= 1;
583 else if (!strcmp (p
, "-funsigned-bitfields")
584 || !strcmp (p
, "-fno-signed-bitfields"))
586 flag_signed_bitfields
= 0;
587 explicit_flag_signed_bitfields
= 1;
589 else if (!strcmp (p
, "-fshort-enums"))
590 flag_short_enums
= 1;
591 else if (!strcmp (p
, "-fno-short-enums"))
592 flag_short_enums
= 0;
593 else if (!strcmp (p
, "-fshort-wchar"))
594 flag_short_wchar
= 1;
595 else if (!strcmp (p
, "-fno-short-wchar"))
596 flag_short_wchar
= 0;
597 else if (!strcmp (p
, "-fcond-mismatch"))
598 flag_cond_mismatch
= 1;
599 else if (!strcmp (p
, "-fno-cond-mismatch"))
600 flag_cond_mismatch
= 0;
601 else if (!strcmp (p
, "-fshort-double"))
602 flag_short_double
= 1;
603 else if (!strcmp (p
, "-fno-short-double"))
604 flag_short_double
= 0;
605 else if (!strcmp (p
, "-fasm"))
607 else if (!strcmp (p
, "-fno-asm"))
609 else if (!strcmp (p
, "-fbuiltin"))
611 else if (!strcmp (p
, "-fno-builtin"))
613 else if (!strcmp (p
, "-ansi"))
615 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
616 mesg_implicit_function_declaration
= 2;
617 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
618 mesg_implicit_function_declaration
= 1;
619 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
620 mesg_implicit_function_declaration
= 0;
621 else if (!strcmp (p
, "-Wimplicit-int"))
622 warn_implicit_int
= 1;
623 else if (!strcmp (p
, "-Wno-implicit-int"))
624 warn_implicit_int
= 0;
625 else if (!strcmp (p
, "-Wimplicit"))
627 warn_implicit_int
= 1;
628 if (mesg_implicit_function_declaration
!= 2)
629 mesg_implicit_function_declaration
= 1;
631 else if (!strcmp (p
, "-Wno-implicit"))
632 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
633 else if (!strcmp (p
, "-Wlong-long"))
635 else if (!strcmp (p
, "-Wno-long-long"))
637 else if (!strcmp (p
, "-Wwrite-strings"))
638 flag_const_strings
= 1;
639 else if (!strcmp (p
, "-Wno-write-strings"))
640 flag_const_strings
= 0;
641 else if (!strcmp (p
, "-Wcast-qual"))
643 else if (!strcmp (p
, "-Wno-cast-qual"))
645 else if (!strcmp (p
, "-Wbad-function-cast"))
646 warn_bad_function_cast
= 1;
647 else if (!strcmp (p
, "-Wno-bad-function-cast"))
648 warn_bad_function_cast
= 0;
649 else if (!strcmp (p
, "-Wmissing-noreturn"))
650 warn_missing_noreturn
= 1;
651 else if (!strcmp (p
, "-Wno-missing-noreturn"))
652 warn_missing_noreturn
= 0;
653 else if (!strcmp (p
, "-Wpointer-arith"))
654 warn_pointer_arith
= 1;
655 else if (!strcmp (p
, "-Wno-pointer-arith"))
656 warn_pointer_arith
= 0;
657 else if (!strcmp (p
, "-Wstrict-prototypes"))
658 warn_strict_prototypes
= 1;
659 else if (!strcmp (p
, "-Wno-strict-prototypes"))
660 warn_strict_prototypes
= 0;
661 else if (!strcmp (p
, "-Wmissing-prototypes"))
662 warn_missing_prototypes
= 1;
663 else if (!strcmp (p
, "-Wno-missing-prototypes"))
664 warn_missing_prototypes
= 0;
665 else if (!strcmp (p
, "-Wmissing-declarations"))
666 warn_missing_declarations
= 1;
667 else if (!strcmp (p
, "-Wno-missing-declarations"))
668 warn_missing_declarations
= 0;
669 else if (!strcmp (p
, "-Wredundant-decls"))
670 warn_redundant_decls
= 1;
671 else if (!strcmp (p
, "-Wno-redundant-decls"))
672 warn_redundant_decls
= 0;
673 else if (!strcmp (p
, "-Wnested-externs"))
674 warn_nested_externs
= 1;
675 else if (!strcmp (p
, "-Wno-nested-externs"))
676 warn_nested_externs
= 0;
677 else if (!strcmp (p
, "-Wtraditional"))
678 warn_traditional
= 1;
679 else if (!strcmp (p
, "-Wno-traditional"))
680 warn_traditional
= 0;
681 else if (!strncmp (p
, "-Wformat=", 9))
682 warn_format
= atol (p
+ 9);
683 else if (!strcmp (p
, "-Wformat"))
685 else if (!strcmp (p
, "-Wno-format"))
687 else if (!strcmp (p
, "-Wchar-subscripts"))
688 warn_char_subscripts
= 1;
689 else if (!strcmp (p
, "-Wno-char-subscripts"))
690 warn_char_subscripts
= 0;
691 else if (!strcmp (p
, "-Wconversion"))
693 else if (!strcmp (p
, "-Wno-conversion"))
695 else if (!strcmp (p
, "-Wparentheses"))
696 warn_parentheses
= 1;
697 else if (!strcmp (p
, "-Wno-parentheses"))
698 warn_parentheses
= 0;
699 else if (!strcmp (p
, "-Wreturn-type"))
700 warn_return_type
= 1;
701 else if (!strcmp (p
, "-Wno-return-type"))
702 warn_return_type
= 0;
703 else if (!strcmp (p
, "-Wcomment"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p
, "-Wno-comment"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p
, "-Wcomments"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p
, "-Wno-comments"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p
, "-Wtrigraphs"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p
, "-Wno-trigraphs"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p
, "-Wundef"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p
, "-Wno-undef"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p
, "-Wimport"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p
, "-Wno-import"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p
, "-Wmissing-braces"))
724 warn_missing_braces
= 1;
725 else if (!strcmp (p
, "-Wno-missing-braces"))
726 warn_missing_braces
= 0;
727 else if (!strcmp (p
, "-Wmain"))
729 else if (!strcmp (p
, "-Wno-main"))
731 else if (!strcmp (p
, "-Wsign-compare"))
732 warn_sign_compare
= 1;
733 else if (!strcmp (p
, "-Wno-sign-compare"))
734 warn_sign_compare
= 0;
735 else if (!strcmp (p
, "-Wfloat-equal"))
736 warn_float_equal
= 1;
737 else if (!strcmp (p
, "-Wno-float-equal"))
738 warn_float_equal
= 0;
739 else if (!strcmp (p
, "-Wmultichar"))
741 else if (!strcmp (p
, "-Wno-multichar"))
743 else if (!strcmp (p
, "-Wunknown-pragmas"))
744 /* Set to greater than 1, so that even unknown pragmas in system
745 headers will be warned about. */
746 warn_unknown_pragmas
= 2;
747 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
748 warn_unknown_pragmas
= 0;
749 else if (!strcmp (p
, "-Wall"))
751 /* We save the value of warn_uninitialized, since if they put
752 -Wuninitialized on the command line, we need to generate a
753 warning about not using it without also specifying -O. */
754 if (warn_uninitialized
!= 1)
755 warn_uninitialized
= 2;
756 warn_implicit_int
= 1;
757 mesg_implicit_function_declaration
= 1;
758 warn_return_type
= 1;
762 warn_char_subscripts
= 1;
763 warn_parentheses
= 1;
764 warn_missing_braces
= 1;
765 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
766 it off only if it's not explicit. */
768 /* Only warn about unknown pragmas that are not in system headers. */
769 warn_unknown_pragmas
= 1;
772 return strings_processed
;
777 /* Hooks for print_node. */
780 print_lang_decl (file
, node
, indent
)
781 FILE *file ATTRIBUTE_UNUSED
;
782 tree node ATTRIBUTE_UNUSED
;
783 int indent ATTRIBUTE_UNUSED
;
788 print_lang_type (file
, node
, indent
)
789 FILE *file ATTRIBUTE_UNUSED
;
790 tree node ATTRIBUTE_UNUSED
;
791 int indent ATTRIBUTE_UNUSED
;
796 print_lang_identifier (file
, node
, indent
)
801 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
802 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
803 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
804 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
805 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
806 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
809 /* Hook called at end of compilation to assume 1 elt
810 for a top-level array decl that wasn't complete before. */
813 finish_incomplete_decl (decl
)
816 if (TREE_CODE (decl
) == VAR_DECL
)
818 tree type
= TREE_TYPE (decl
);
819 if (type
!= error_mark_node
820 && TREE_CODE (type
) == ARRAY_TYPE
821 && TYPE_DOMAIN (type
) == 0)
823 if (! DECL_EXTERNAL (decl
))
824 warning_with_decl (decl
, "array `%s' assumed to have one element");
826 complete_array_type (type
, NULL_TREE
, 1);
828 layout_decl (decl
, 0);
833 /* Create a new `struct binding_level'. */
836 struct binding_level
*
837 make_binding_level ()
840 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
843 /* Nonzero if we are currently in the global binding level. */
848 return current_binding_level
== global_binding_level
;
854 keep_next_level_flag
= 1;
857 /* Nonzero if the current level needs to have a BLOCK made. */
862 return ((current_binding_level
->keep_if_subblocks
863 && current_binding_level
->blocks
!= 0)
864 || current_binding_level
->keep
865 || current_binding_level
->names
!= 0
866 || (current_binding_level
->tags
!= 0
867 && !current_binding_level
->tag_transparent
));
870 /* Identify this binding level as a level of parameters.
871 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
872 But it turns out there is no way to pass the right value for
873 DEFINITION_FLAG, so we ignore it. */
876 declare_parm_level (definition_flag
)
877 int definition_flag ATTRIBUTE_UNUSED
;
879 current_binding_level
->parm_flag
= 1;
882 /* Nonzero if currently making parm declarations. */
887 return current_binding_level
->parm_flag
;
890 /* Enter a new binding level.
891 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
892 not for that of tags. */
895 pushlevel (tag_transparent
)
898 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
900 /* If this is the top level of a function,
901 just make sure that NAMED_LABELS is 0. */
903 if (current_binding_level
== global_binding_level
)
908 /* Reuse or create a struct for this binding level. */
910 if (free_binding_level
)
912 newlevel
= free_binding_level
;
913 free_binding_level
= free_binding_level
->level_chain
;
917 newlevel
= make_binding_level ();
920 /* Add this level to the front of the chain (stack) of levels that
923 *newlevel
= clear_binding_level
;
924 newlevel
->tag_transparent
926 || (current_binding_level
927 ? current_binding_level
->subblocks_tag_transparent
929 newlevel
->level_chain
= current_binding_level
;
930 current_binding_level
= newlevel
;
931 newlevel
->keep
= keep_next_level_flag
;
932 keep_next_level_flag
= 0;
933 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
934 keep_next_if_subblocks
= 0;
937 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
940 clear_limbo_values (block
)
945 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
946 if (DECL_NAME (tem
) != 0)
947 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
949 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
950 clear_limbo_values (tem
);
953 /* Exit a binding level.
954 Pop the level off, and restore the state of the identifier-decl mappings
955 that were in effect when this level was entered.
957 If KEEP is nonzero, this level had explicit declarations, so
958 and create a "block" (a BLOCK node) for the level
959 to record its declarations and subblocks for symbol table output.
961 If FUNCTIONBODY is nonzero, this level is the body of a function,
962 so create a block as if KEEP were set and also clear out all
965 If REVERSE is nonzero, reverse the order of decls before putting
966 them into the BLOCK. */
969 poplevel (keep
, reverse
, functionbody
)
975 /* The chain of decls was accumulated in reverse order.
976 Put it into forward order, just for cleanliness. */
978 tree tags
= current_binding_level
->tags
;
979 tree subblocks
= current_binding_level
->blocks
;
982 int block_previously_created
;
984 keep
|= current_binding_level
->keep
;
986 /* This warning is turned off because it causes warnings for
987 declarations like `extern struct foo *x'. */
989 /* Warn about incomplete structure types in this level. */
990 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
991 if (!COMPLETE_TYPE_P (TREE_VALUE (link
)))
993 tree type
= TREE_VALUE (link
);
994 tree type_name
= TYPE_NAME (type
);
995 char *id
= IDENTIFIER_POINTER (TREE_CODE (type_name
) == IDENTIFIER_NODE
997 : DECL_NAME (type_name
));
998 switch (TREE_CODE (type
))
1001 error ("`struct %s' incomplete in scope ending here", id
);
1004 error ("`union %s' incomplete in scope ending here", id
);
1007 error ("`enum %s' incomplete in scope ending here", id
);
1013 /* Get the decls in the order they were written.
1014 Usually current_binding_level->names is in reverse order.
1015 But parameter decls were previously put in forward order. */
1018 current_binding_level
->names
1019 = decls
= nreverse (current_binding_level
->names
);
1021 decls
= current_binding_level
->names
;
1023 /* Output any nested inline functions within this block
1024 if they weren't already output. */
1026 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1027 if (TREE_CODE (decl
) == FUNCTION_DECL
1028 && ! TREE_ASM_WRITTEN (decl
)
1029 && DECL_INITIAL (decl
) != 0
1030 && TREE_ADDRESSABLE (decl
))
1032 /* If this decl was copied from a file-scope decl
1033 on account of a block-scope extern decl,
1034 propagate TREE_ADDRESSABLE to the file-scope decl.
1036 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1037 true, since then the decl goes through save_for_inline_copying. */
1038 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1039 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1040 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1041 else if (DECL_SAVED_INSNS (decl
) != 0)
1043 push_function_context ();
1044 output_inline_function (decl
);
1045 pop_function_context ();
1049 /* If there were any declarations or structure tags in that level,
1050 or if this level is a function body,
1051 create a BLOCK to record them for the life of this function. */
1054 block_previously_created
= (current_binding_level
->this_block
!= 0);
1055 if (block_previously_created
)
1056 block
= current_binding_level
->this_block
;
1057 else if (keep
|| functionbody
1058 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1059 block
= make_node (BLOCK
);
1062 BLOCK_VARS (block
) = decls
;
1063 BLOCK_SUBBLOCKS (block
) = subblocks
;
1066 /* In each subblock, record that this is its superior. */
1068 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1069 BLOCK_SUPERCONTEXT (link
) = block
;
1071 /* Clear out the meanings of the local variables of this level. */
1073 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1075 if (DECL_NAME (link
) != 0)
1077 /* If the ident. was used or addressed via a local extern decl,
1078 don't forget that fact. */
1079 if (DECL_EXTERNAL (link
))
1081 if (TREE_USED (link
))
1082 TREE_USED (DECL_NAME (link
)) = 1;
1083 if (TREE_ADDRESSABLE (link
))
1084 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1086 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1090 /* Restore all name-meanings of the outer levels
1091 that were shadowed by this level. */
1093 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1094 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1096 /* If the level being exited is the top level of a function,
1097 check over all the labels, and clear out the current
1098 (function local) meanings of their names. */
1102 clear_limbo_values (block
);
1104 /* If this is the top level block of a function,
1105 the vars are the function's parameters.
1106 Don't leave them in the BLOCK because they are
1107 found in the FUNCTION_DECL instead. */
1109 BLOCK_VARS (block
) = 0;
1111 /* Clear out the definitions of all label names,
1112 since their scopes end here,
1113 and add them to BLOCK_VARS. */
1115 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1117 register tree label
= TREE_VALUE (link
);
1119 if (DECL_INITIAL (label
) == 0)
1121 error_with_decl (label
, "label `%s' used but not defined");
1122 /* Avoid crashing later. */
1123 define_label (input_filename
, lineno
,
1126 else if (warn_unused_label
&& !TREE_USED (label
))
1127 warning_with_decl (label
, "label `%s' defined but not used");
1128 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1130 /* Put the labels into the "variables" of the
1131 top-level block, so debugger can see them. */
1132 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1133 BLOCK_VARS (block
) = label
;
1137 /* Pop the current level, and free the structure for reuse. */
1140 register struct binding_level
*level
= current_binding_level
;
1141 current_binding_level
= current_binding_level
->level_chain
;
1143 level
->level_chain
= free_binding_level
;
1144 free_binding_level
= level
;
1147 /* Dispose of the block that we just made inside some higher level. */
1149 DECL_INITIAL (current_function_decl
) = block
;
1152 if (!block_previously_created
)
1153 current_binding_level
->blocks
1154 = chainon (current_binding_level
->blocks
, block
);
1156 /* If we did not make a block for the level just exited,
1157 any blocks made for inner levels
1158 (since they cannot be recorded as subblocks in that level)
1159 must be carried forward so they will later become subblocks
1160 of something else. */
1162 current_binding_level
->blocks
1163 = chainon (current_binding_level
->blocks
, subblocks
);
1165 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1166 binding contour so that they point to the appropriate construct, i.e.
1167 either to the current FUNCTION_DECL node, or else to the BLOCK node
1168 we just constructed.
1170 Note that for tagged types whose scope is just the formal parameter
1171 list for some function type specification, we can't properly set
1172 their TYPE_CONTEXTs here, because we don't have a pointer to the
1173 appropriate FUNCTION_TYPE node readily available to us. For those
1174 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1175 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1176 node which will represent the "scope" for these "parameter list local"
1181 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1182 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1184 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1185 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1188 TREE_USED (block
) = 1;
1192 /* Delete the node BLOCK from the current binding level.
1193 This is used for the block inside a stmt expr ({...})
1194 so that the block can be reinserted where appropriate. */
1197 delete_block (block
)
1201 if (current_binding_level
->blocks
== block
)
1202 current_binding_level
->blocks
= TREE_CHAIN (block
);
1203 for (t
= current_binding_level
->blocks
; t
;)
1205 if (TREE_CHAIN (t
) == block
)
1206 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1210 TREE_CHAIN (block
) = NULL
;
1211 /* Clear TREE_USED which is always set by poplevel.
1212 The flag is set again if insert_block is called. */
1213 TREE_USED (block
) = 0;
1216 /* Insert BLOCK at the end of the list of subblocks of the
1217 current binding level. This is used when a BIND_EXPR is expanded,
1218 to handle the BLOCK node inside the BIND_EXPR. */
1221 insert_block (block
)
1224 TREE_USED (block
) = 1;
1225 current_binding_level
->blocks
1226 = chainon (current_binding_level
->blocks
, block
);
1229 /* Set the BLOCK node for the innermost scope
1230 (the one we are currently in). */
1234 register tree block
;
1236 current_binding_level
->this_block
= block
;
1242 register struct binding_level
*newlevel
;
1244 /* Reuse or create a struct for this binding level. */
1246 if (free_binding_level
)
1248 newlevel
= free_binding_level
;
1249 free_binding_level
= free_binding_level
->level_chain
;
1253 newlevel
= make_binding_level ();
1256 /* Add this level to the front of the chain (stack) of label levels. */
1258 newlevel
->level_chain
= label_level_chain
;
1259 label_level_chain
= newlevel
;
1261 newlevel
->names
= named_labels
;
1262 newlevel
->shadowed
= shadowed_labels
;
1264 shadowed_labels
= 0;
1270 register struct binding_level
*level
= label_level_chain
;
1273 /* Clear out the definitions of the declared labels in this level.
1274 Leave in the list any ordinary, non-declared labels. */
1275 for (link
= named_labels
, prev
= 0; link
;)
1277 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1279 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1281 error_with_decl (TREE_VALUE (link
),
1282 "label `%s' used but not defined");
1283 /* Avoid crashing later. */
1284 define_label (input_filename
, lineno
,
1285 DECL_NAME (TREE_VALUE (link
)));
1287 else if (warn_unused_label
&& !TREE_USED (TREE_VALUE (link
)))
1288 warning_with_decl (TREE_VALUE (link
),
1289 "label `%s' defined but not used");
1290 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1292 /* Delete this element from the list. */
1293 link
= TREE_CHAIN (link
);
1295 TREE_CHAIN (prev
) = link
;
1297 named_labels
= link
;
1302 link
= TREE_CHAIN (link
);
1306 /* Bring back all the labels that were shadowed. */
1307 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1308 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1309 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1310 = TREE_VALUE (link
);
1312 named_labels
= chainon (named_labels
, level
->names
);
1313 shadowed_labels
= level
->shadowed
;
1315 /* Pop the current level, and free the structure for reuse. */
1316 label_level_chain
= label_level_chain
->level_chain
;
1317 level
->level_chain
= free_binding_level
;
1318 free_binding_level
= level
;
1321 /* Push a definition or a declaration of struct, union or enum tag "name".
1322 "type" should be the type node.
1323 We assume that the tag "name" is not already defined.
1325 Note that the definition may really be just a forward reference.
1326 In that case, the TYPE_SIZE will be zero. */
1329 pushtag (name
, type
)
1332 register struct binding_level
*b
;
1334 /* Find the proper binding level for this type tag. */
1336 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1341 /* Record the identifier as the type's name if it has none. */
1343 if (TYPE_NAME (type
) == 0)
1344 TYPE_NAME (type
) = name
;
1347 b
->tags
= tree_cons (name
, type
, b
->tags
);
1349 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1350 tagged type we just added to the current binding level. This fake
1351 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1352 to output a representation of a tagged type, and it also gives
1353 us a convenient place to record the "scope start" address for the
1356 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1358 /* An approximation for now, so we can tell this is a function-scope tag.
1359 This will be updated in poplevel. */
1360 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1363 /* Handle when a new declaration NEWDECL
1364 has the same name as an old one OLDDECL
1365 in the same binding contour.
1366 Prints an error message if appropriate.
1368 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1369 Otherwise, return 0.
1371 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1372 and OLDDECL is in an outer binding level and should thus not be changed. */
1375 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1376 register tree newdecl
, olddecl
;
1377 int different_binding_level
;
1379 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1380 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1381 && DECL_INITIAL (newdecl
) != 0);
1382 tree oldtype
= TREE_TYPE (olddecl
);
1383 tree newtype
= TREE_TYPE (newdecl
);
1386 if (DECL_P (olddecl
))
1387 DECL_MACHINE_ATTRIBUTES (newdecl
)
1388 = merge_machine_decl_attributes (olddecl
, newdecl
);
1390 if (TREE_CODE (newtype
) == ERROR_MARK
1391 || TREE_CODE (oldtype
) == ERROR_MARK
)
1394 /* New decl is completely inconsistent with the old one =>
1395 tell caller to replace the old one.
1396 This is always an error except in the case of shadowing a builtin. */
1397 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1399 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1400 && (DECL_BUILT_IN (olddecl
)
1401 || DECL_BUILT_IN_NONANSI (olddecl
)))
1403 /* If you declare a built-in or predefined function name as static,
1404 the old definition is overridden,
1405 but optionally warn this was a bad choice of name. */
1406 if (!TREE_PUBLIC (newdecl
))
1410 else if (DECL_BUILT_IN (olddecl
))
1411 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1413 warning_with_decl (newdecl
, "shadowing library function `%s'");
1415 /* Likewise, if the built-in is not ansi, then programs can
1416 override it even globally without an error. */
1417 else if (! DECL_BUILT_IN (olddecl
))
1418 warning_with_decl (newdecl
,
1419 "library function `%s' declared as non-function");
1421 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1422 warning_with_decl (newdecl
,
1423 "built-in function `%s' declared as non-function");
1425 warning_with_decl (newdecl
,
1426 "built-in function `%s' declared as non-function");
1430 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1431 error_with_decl (olddecl
, "previous declaration of `%s'");
1437 /* For real parm decl following a forward decl,
1438 return 1 so old decl will be reused. */
1439 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1440 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1443 /* The new declaration is the same kind of object as the old one.
1444 The declarations may partially match. Print warnings if they don't
1445 match enough. Ultimately, copy most of the information from the new
1446 decl to the old one, and keep using the old one. */
1448 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1449 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1450 && DECL_INITIAL (olddecl
) == 0)
1451 /* If -traditional, avoid error for redeclaring fcn
1452 after implicit decl. */
1454 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1455 && DECL_BUILT_IN (olddecl
))
1457 /* A function declaration for a built-in function. */
1458 if (!TREE_PUBLIC (newdecl
))
1460 /* If you declare a built-in function name as static, the
1461 built-in definition is overridden,
1462 but optionally warn this was a bad choice of name. */
1464 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1465 /* Discard the old built-in function. */
1468 else if (!types_match
)
1470 /* Accept the return type of the new declaration if same modes. */
1471 tree oldreturntype
= TREE_TYPE (oldtype
);
1472 tree newreturntype
= TREE_TYPE (newtype
);
1474 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1476 /* Function types may be shared, so we can't just modify
1477 the return type of olddecl's function type. */
1479 = build_function_type (newreturntype
,
1480 TYPE_ARG_TYPES (oldtype
));
1482 types_match
= comptypes (newtype
, trytype
);
1486 /* Accept harmless mismatch in first argument type also.
1488 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1489 && TYPE_ARG_TYPES (oldtype
) != 0
1490 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1491 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1492 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1493 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1495 /* Function types may be shared, so we can't just modify
1496 the return type of olddecl's function type. */
1498 = build_function_type (TREE_TYPE (oldtype
),
1499 tree_cons (NULL_TREE
,
1500 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1501 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1503 types_match
= comptypes (newtype
, trytype
);
1507 if (! different_binding_level
)
1508 TREE_TYPE (olddecl
) = oldtype
;
1512 /* If types don't match for a built-in, throw away the built-in. */
1513 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1517 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1518 && DECL_SOURCE_LINE (olddecl
) == 0)
1520 /* A function declaration for a predeclared function
1521 that isn't actually built in. */
1522 if (!TREE_PUBLIC (newdecl
))
1524 /* If you declare it as static, the
1525 default definition is overridden. */
1528 else if (!types_match
)
1530 /* If the types don't match, preserve volatility indication.
1531 Later on, we will discard everything else about the
1532 default declaration. */
1533 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1536 /* Permit char *foo () to match void *foo (...) if not pedantic,
1537 if one of them came from a system header file. */
1538 else if (!types_match
1539 && TREE_CODE (olddecl
) == FUNCTION_DECL
1540 && TREE_CODE (newdecl
) == FUNCTION_DECL
1541 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1542 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1543 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1544 || DECL_IN_SYSTEM_HEADER (newdecl
))
1545 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1546 && TYPE_ARG_TYPES (oldtype
) == 0
1547 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1548 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1550 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1551 && TYPE_ARG_TYPES (newtype
) == 0
1552 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1553 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1556 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1557 /* Make sure we keep void * as ret type, not char *. */
1558 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1559 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1561 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1562 we will come back here again. */
1563 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1565 else if (!types_match
1566 /* Permit char *foo (int, ...); followed by char *foo ();
1568 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1570 /* Return types must still match. */
1571 && comptypes (TREE_TYPE (oldtype
),
1572 TREE_TYPE (newtype
))
1573 && TYPE_ARG_TYPES (newtype
) == 0))
1575 error_with_decl (newdecl
, "conflicting types for `%s'");
1576 /* Check for function type mismatch
1577 involving an empty arglist vs a nonempty one. */
1578 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1579 && comptypes (TREE_TYPE (oldtype
),
1580 TREE_TYPE (newtype
))
1581 && ((TYPE_ARG_TYPES (oldtype
) == 0
1582 && DECL_INITIAL (olddecl
) == 0)
1584 (TYPE_ARG_TYPES (newtype
) == 0
1585 && DECL_INITIAL (newdecl
) == 0)))
1587 /* Classify the problem further. */
1588 register tree t
= TYPE_ARG_TYPES (oldtype
);
1590 t
= TYPE_ARG_TYPES (newtype
);
1591 for (; t
; t
= TREE_CHAIN (t
))
1593 register tree type
= TREE_VALUE (t
);
1595 if (TREE_CHAIN (t
) == 0
1596 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1598 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1602 if (simple_type_promotes_to (type
) != NULL_TREE
)
1604 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1609 error_with_decl (olddecl
, "previous declaration of `%s'");
1613 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1619 error_with_decl (newdecl
, "redefinition of `%s'");
1622 error_with_decl (newdecl
, "redeclaration of `%s'");
1625 error_with_decl (newdecl
, "conflicting declarations of `%s'");
1631 error_with_decl (olddecl
,
1632 ((DECL_INITIAL (olddecl
)
1633 && current_binding_level
== global_binding_level
)
1634 ? "`%s' previously defined here"
1635 : "`%s' previously declared here"));
1637 else if (TREE_CODE (newdecl
) == TYPE_DECL
1638 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1639 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1641 warning_with_decl (newdecl
, "redefinition of `%s'");
1644 ((DECL_INITIAL (olddecl
)
1645 && current_binding_level
== global_binding_level
)
1646 ? "`%s' previously defined here"
1647 : "`%s' previously declared here"));
1649 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1650 && DECL_INITIAL (olddecl
) != 0
1651 && TYPE_ARG_TYPES (oldtype
) == 0
1652 && TYPE_ARG_TYPES (newtype
) != 0
1653 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1655 register tree type
, parm
;
1657 /* Prototype decl follows defn w/o prototype. */
1659 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1660 type
= TYPE_ARG_TYPES (newtype
),
1663 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1665 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1666 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1668 warning_with_decl (newdecl
, "prototype for `%s' follows");
1669 warning_with_decl (olddecl
, "non-prototype definition here");
1672 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1673 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1675 error_with_decl (newdecl
, "prototype for `%s' follows and number of arguments doesn't match");
1676 error_with_decl (olddecl
, "non-prototype definition here");
1680 /* Type for passing arg must be consistent
1681 with that declared for the arg. */
1682 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1683 /* If -traditional, allow `unsigned int' instead of `int'
1684 in the prototype. */
1685 && (! (flag_traditional
1686 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1687 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1689 error_with_decl (newdecl
,
1690 "prototype for `%s' follows and argument %d doesn't match",
1692 error_with_decl (olddecl
, "non-prototype definition here");
1698 /* Warn about mismatches in various flags. */
1701 /* Warn if function is now inline
1702 but was previously declared not inline and has been called. */
1703 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1704 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1705 && TREE_USED (olddecl
))
1706 warning_with_decl (newdecl
,
1707 "`%s' declared inline after being called");
1708 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1709 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1710 && DECL_INITIAL (olddecl
) != 0)
1711 warning_with_decl (newdecl
,
1712 "`%s' declared inline after its definition");
1714 /* If pedantic, warn when static declaration follows a non-static
1715 declaration. Otherwise, do so only for functions. */
1716 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1717 && TREE_PUBLIC (olddecl
)
1718 && !TREE_PUBLIC (newdecl
))
1719 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1721 /* If warn_traditional, warn when a non-static function
1722 declaration follows a static one. */
1723 if (warn_traditional
1724 && TREE_CODE (olddecl
) == FUNCTION_DECL
1725 && !TREE_PUBLIC (olddecl
)
1726 && TREE_PUBLIC (newdecl
))
1727 warning_with_decl (newdecl
, "non-static declaration for `%s' follows static");
1729 /* Warn when const declaration follows a non-const
1730 declaration, but not for functions. */
1731 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1732 && !TREE_READONLY (olddecl
)
1733 && TREE_READONLY (newdecl
))
1734 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1735 /* These bits are logically part of the type, for variables.
1736 But not for functions
1737 (where qualifiers are not valid ANSI anyway). */
1738 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1739 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1740 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1741 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1745 /* Optionally warn about more than one declaration for the same name. */
1746 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1747 /* Don't warn about a function declaration
1748 followed by a definition. */
1749 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1750 && DECL_INITIAL (olddecl
) == 0)
1751 /* Don't warn about extern decl followed by (tentative) definition. */
1752 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1754 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1755 warning_with_decl (olddecl
, "previous declaration of `%s'");
1758 /* Copy all the DECL_... slots specified in the new decl
1759 except for any that we copy here from the old type.
1761 Past this point, we don't change OLDTYPE and NEWTYPE
1762 even if we change the types of NEWDECL and OLDDECL. */
1766 /* When copying info to olddecl, we store into write_olddecl
1767 instead. This allows us to avoid modifying olddecl when
1768 different_binding_level is true. */
1769 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1771 /* Merge the data types specified in the two decls. */
1772 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1774 if (different_binding_level
)
1776 = build_type_attribute_variant
1778 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1779 TYPE_ATTRIBUTES (oldtype
)));
1782 = TREE_TYPE (olddecl
)
1783 = common_type (newtype
, oldtype
);
1786 /* Lay the type out, unless already done. */
1787 if (oldtype
!= TREE_TYPE (newdecl
))
1789 if (TREE_TYPE (newdecl
) != error_mark_node
)
1790 layout_type (TREE_TYPE (newdecl
));
1791 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1792 && TREE_CODE (newdecl
) != TYPE_DECL
1793 && TREE_CODE (newdecl
) != CONST_DECL
)
1794 layout_decl (newdecl
, 0);
1798 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1799 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1800 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1801 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1802 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1803 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1804 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1807 /* Keep the old rtl since we can safely use it. */
1808 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1810 /* Merge the type qualifiers. */
1811 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1812 && DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1813 && ! TREE_THIS_VOLATILE (newdecl
))
1814 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1816 if (TREE_READONLY (newdecl
))
1817 TREE_READONLY (write_olddecl
) = 1;
1819 if (TREE_THIS_VOLATILE (newdecl
))
1821 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1822 if (TREE_CODE (newdecl
) == VAR_DECL
)
1823 make_var_volatile (newdecl
);
1826 /* Keep source location of definition rather than declaration. */
1827 /* When called with different_binding_level set, keep the old
1828 information so that meaningful diagnostics can be given. */
1829 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1830 && ! different_binding_level
)
1832 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1833 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1836 /* Merge the unused-warning information. */
1837 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1838 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1839 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1840 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1842 /* Merge the initialization information. */
1843 /* When called with different_binding_level set, don't copy over
1844 DECL_INITIAL, so that we don't accidentally change function
1845 declarations into function definitions. */
1846 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1847 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1849 /* Merge the section attribute.
1850 We want to issue an error if the sections conflict but that must be
1851 done later in decl_attributes since we are called before attributes
1853 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1854 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1856 /* Copy the assembler name.
1857 Currently, it can only be defined in the prototype. */
1858 DECL_ASSEMBLER_NAME (newdecl
) = DECL_ASSEMBLER_NAME (olddecl
);
1860 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1862 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1863 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1865 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1866 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1867 DECL_NO_CHECK_MEMORY_USAGE (newdecl
)
1868 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl
);
1869 DECL_NO_LIMIT_STACK (newdecl
)
1870 |= DECL_NO_LIMIT_STACK (olddecl
);
1873 /* If cannot merge, then use the new type and qualifiers,
1874 and don't preserve the old rtl. */
1875 else if (! different_binding_level
)
1877 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1878 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1879 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1880 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1883 /* Merge the storage class information. */
1884 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1885 /* For functions, static overrides non-static. */
1886 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1888 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1889 /* This is since we don't automatically
1890 copy the attributes of NEWDECL into OLDDECL. */
1891 /* No need to worry about different_binding_level here because
1892 then TREE_PUBLIC (newdecl) was true. */
1893 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1894 /* If this clears `static', clear it in the identifier too. */
1895 if (! TREE_PUBLIC (olddecl
))
1896 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1898 if (DECL_EXTERNAL (newdecl
))
1900 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1901 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1902 /* An extern decl does not override previous storage class. */
1903 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1904 if (! DECL_EXTERNAL (newdecl
))
1905 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1909 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1910 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1913 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1915 /* If either decl says `inline', this fn is inline,
1916 unless its definition was passed already. */
1917 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1918 DECL_INLINE (olddecl
) = 1;
1920 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1922 if (DECL_BUILT_IN (olddecl
))
1924 /* Get rid of any built-in function if new arg types don't match it
1925 or if we have a function definition. */
1926 if (! types_match
|| new_is_definition
)
1928 if (! different_binding_level
)
1930 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1931 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
1936 /* If redeclaring a builtin function, and not a definition,
1937 it stays built in. */
1938 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1939 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1942 /* Also preserve various other info from the definition. */
1943 else if (! new_is_definition
)
1944 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1945 if (! new_is_definition
)
1947 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1948 /* When called with different_binding_level set, don't copy over
1949 DECL_INITIAL, so that we don't accidentally change function
1950 declarations into function definitions. */
1951 if (! different_binding_level
)
1952 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1953 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1954 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1955 if (DECL_INLINE (newdecl
))
1956 DECL_ABSTRACT_ORIGIN (newdecl
) = DECL_ORIGIN (olddecl
);
1959 if (different_binding_level
)
1961 /* Don't output a duplicate symbol or debugging information for this
1964 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1965 just have two declarations without a definition. VAR_DECLs may need
1966 the same treatment, I'm not sure. */
1967 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1968 DECL_IGNORED_P (newdecl
) = 1;
1970 TREE_ASM_WRITTEN (newdecl
) = DECL_IGNORED_P (newdecl
) = 1;
1974 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1975 But preserve OLDDECL's DECL_UID. */
1977 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1979 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1980 (char *) olddecl
+ sizeof (struct tree_common
),
1981 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1982 DECL_UID (olddecl
) = olddecl_uid
;
1985 /* NEWDECL contains the merged attribute lists.
1986 Update OLDDECL to be the same. */
1987 DECL_MACHINE_ATTRIBUTES (olddecl
) = DECL_MACHINE_ATTRIBUTES (newdecl
);
1992 /* Record a decl-node X as belonging to the current lexical scope.
1993 Check for errors (such as an incompatible declaration for the same
1994 name already seen in the same scope).
1996 Returns either X or an old decl for the same name.
1997 If an old decl is returned, it may have been smashed
1998 to agree with what X says. */
2005 register tree name
= DECL_NAME (x
);
2006 register struct binding_level
*b
= current_binding_level
;
2008 DECL_CONTEXT (x
) = current_function_decl
;
2009 /* A local extern declaration for a function doesn't constitute nesting.
2010 A local auto declaration does, since it's a forward decl
2011 for a nested function coming later. */
2012 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
2013 && DECL_EXTERNAL (x
))
2014 DECL_CONTEXT (x
) = 0;
2016 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
2017 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2018 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2019 && !DECL_IN_SYSTEM_HEADER (x
))
2020 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
2026 int different_binding_level
= 0;
2028 t
= lookup_name_current_level (name
);
2029 /* Don't type check externs here when -traditional. This is so that
2030 code with conflicting declarations inside blocks will get warnings
2031 not errors. X11 for instance depends on this. */
2032 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2034 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2035 /* Type decls at global scope don't conflict with externs declared
2036 inside lexical blocks. */
2037 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2039 different_binding_level
= 1;
2041 if (t
!= 0 && t
== error_mark_node
)
2042 /* error_mark_node is 0 for a while during initialization! */
2045 error_with_decl (x
, "`%s' used prior to declaration");
2050 file
= DECL_SOURCE_FILE (t
);
2051 line
= DECL_SOURCE_LINE (t
);
2054 /* If this decl is `static' and an implicit decl was seen previously,
2055 warn. But don't complain if -traditional,
2056 since traditional compilers don't complain. */
2057 if (! flag_traditional
&& TREE_PUBLIC (name
)
2058 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2059 sets this for all functions. */
2060 && ! TREE_PUBLIC (x
)
2061 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2062 /* We used to warn also for explicit extern followed by static,
2063 but sometimes you need to do it that way. */
2064 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2066 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2067 IDENTIFIER_POINTER (name
));
2068 pedwarn_with_file_and_line
2069 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2070 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2071 "previous declaration of `%s'",
2072 IDENTIFIER_POINTER (name
));
2073 TREE_THIS_VOLATILE (name
) = 1;
2076 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2078 if (TREE_CODE (t
) == PARM_DECL
)
2080 /* Don't allow more than one "real" duplicate
2081 of a forward parm decl. */
2082 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2088 /* If we are processing a typedef statement, generate a whole new
2089 ..._TYPE node (which will be just an variant of the existing
2090 ..._TYPE node with identical properties) and then install the
2091 TYPE_DECL node generated to represent the typedef name as the
2092 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2094 The whole point here is to end up with a situation where each
2095 and every ..._TYPE node the compiler creates will be uniquely
2096 associated with AT MOST one node representing a typedef name.
2097 This way, even though the compiler substitutes corresponding
2098 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2099 early on, later parts of the compiler can always do the reverse
2100 translation and get back the corresponding typedef name. For
2103 typedef struct S MY_TYPE;
2106 Later parts of the compiler might only know that `object' was of
2107 type `struct S' if it were not for code just below. With this
2108 code however, later parts of the compiler see something like:
2110 struct S' == struct S
2111 typedef struct S' MY_TYPE;
2114 And they can then deduce (from the node for type struct S') that
2115 the original object declaration was:
2119 Being able to do this is important for proper support of protoize,
2120 and also for generating precise symbolic debugging information
2121 which takes full account of the programmer's (typedef) vocabulary.
2123 Obviously, we don't want to generate a duplicate ..._TYPE node if
2124 the TYPE_DECL node that we are now processing really represents a
2125 standard built-in type.
2127 Since all standard types are effectively declared at line zero
2128 in the source file, we can easily check to see if we are working
2129 on a standard type by checking the current value of lineno. */
2131 if (TREE_CODE (x
) == TYPE_DECL
)
2133 if (DECL_SOURCE_LINE (x
) == 0)
2135 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2136 TYPE_NAME (TREE_TYPE (x
)) = x
;
2138 else if (TREE_TYPE (x
) != error_mark_node
2139 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2141 tree tt
= TREE_TYPE (x
);
2142 DECL_ORIGINAL_TYPE (x
) = tt
;
2143 tt
= build_type_copy (tt
);
2145 TREE_USED (tt
) = TREE_USED (x
);
2150 /* Multiple external decls of the same identifier ought to match.
2151 Check against both global declarations (when traditional) and out of
2152 scope (limbo) block level declarations.
2154 We get warnings about inline functions where they are defined.
2155 Avoid duplicate warnings where they are used. */
2157 && ! (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INLINE (x
)))
2161 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2162 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2163 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2164 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2165 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2166 /* Decls in limbo are always extern, so no need to check that. */
2167 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2171 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2172 /* If old decl is built-in, we already warned if we should. */
2173 && !DECL_BUILT_IN (decl
))
2175 pedwarn_with_decl (x
,
2176 "type mismatch with previous external decl");
2177 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2181 /* If a function has had an implicit declaration, and then is defined,
2182 make sure they are compatible. */
2184 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2185 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2186 && TREE_CODE (x
) == FUNCTION_DECL
2187 && ! comptypes (TREE_TYPE (x
),
2188 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2190 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2191 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2192 "previous implicit declaration of `%s'");
2195 /* In PCC-compatibility mode, extern decls of vars with no current decl
2196 take effect at top level no matter where they are. */
2197 if (flag_traditional
&& DECL_EXTERNAL (x
)
2198 && lookup_name (name
) == 0)
2200 tree type
= TREE_TYPE (x
);
2202 /* But don't do this if the type contains temporary nodes. */
2205 if (type
== error_mark_node
)
2207 if (TYPE_CONTEXT (type
))
2209 warning_with_decl (x
, "type of external `%s' is not global");
2210 /* By exiting the loop early, we leave TYPE nonzero,
2211 and thus prevent globalization of the decl. */
2214 else if (TREE_CODE (type
) == FUNCTION_TYPE
2215 && TYPE_ARG_TYPES (type
) != 0)
2216 /* The types might not be truly local,
2217 but the list of arg types certainly is temporary.
2218 Since prototypes are nontraditional,
2219 ok not to do the traditional thing. */
2221 type
= TREE_TYPE (type
);
2225 b
= global_binding_level
;
2228 /* This name is new in its binding level.
2229 Install the new declaration and return it. */
2230 if (b
== global_binding_level
)
2232 /* Install a global value. */
2234 /* If the first global decl has external linkage,
2235 warn if we later see static one. */
2236 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2237 TREE_PUBLIC (name
) = 1;
2239 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2241 /* We no longer care about any previous block level declarations. */
2242 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2244 /* Don't forget if the function was used via an implicit decl. */
2245 if (IDENTIFIER_IMPLICIT_DECL (name
)
2246 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2247 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2249 /* Don't forget if its address was taken in that way. */
2250 if (IDENTIFIER_IMPLICIT_DECL (name
)
2251 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2252 TREE_ADDRESSABLE (x
) = 1;
2254 /* Warn about mismatches against previous implicit decl. */
2255 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2256 /* If this real decl matches the implicit, don't complain. */
2257 && ! (TREE_CODE (x
) == FUNCTION_DECL
2258 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2259 == integer_type_node
)))
2260 pedwarn ("`%s' was previously implicitly declared to return `int'",
2261 IDENTIFIER_POINTER (name
));
2263 /* If this decl is `static' and an `extern' was seen previously,
2264 that is erroneous. */
2265 if (TREE_PUBLIC (name
)
2266 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2268 /* Okay to redeclare an ANSI built-in as static. */
2269 if (t
!= 0 && DECL_BUILT_IN (t
))
2271 /* Okay to declare a non-ANSI built-in as anything. */
2272 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2274 /* Okay to have global type decl after an earlier extern
2275 declaration inside a lexical block. */
2276 else if (TREE_CODE (x
) == TYPE_DECL
)
2278 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2280 if (! TREE_THIS_VOLATILE (name
))
2281 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2282 IDENTIFIER_POINTER (name
));
2285 pedwarn ("`%s' was declared `extern' and later `static'",
2286 IDENTIFIER_POINTER (name
));
2291 /* Here to install a non-global value. */
2292 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2293 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2295 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2297 /* If this is an extern function declaration, see if we
2298 have a global definition or declaration for the function. */
2301 && TREE_CODE (x
) == FUNCTION_DECL
2302 && TREE_CODE (oldglobal
) == FUNCTION_DECL
2303 && DECL_EXTERNAL (x
) && ! DECL_INLINE (x
))
2305 /* We have one. Their types must agree. */
2306 if (! comptypes (TREE_TYPE (x
),
2307 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2308 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2311 /* Inner extern decl is inline if global one is.
2312 Copy enough to really inline it. */
2313 if (DECL_INLINE (oldglobal
))
2315 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2316 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2317 ? 0 : DECL_INITIAL (oldglobal
));
2318 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2319 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2320 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2321 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2322 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2323 DECL_ABSTRACT_ORIGIN (x
) = DECL_ORIGIN (oldglobal
);
2325 /* Inner extern decl is built-in if global one is. */
2326 if (DECL_BUILT_IN (oldglobal
))
2328 DECL_BUILT_IN_CLASS (x
) = DECL_BUILT_IN_CLASS (oldglobal
);
2329 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2331 /* Keep the arg types from a file-scope fcn defn. */
2332 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2333 && DECL_INITIAL (oldglobal
)
2334 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2335 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2339 #if 0 /* This case is probably sometimes the right thing to do. */
2340 /* If we have a local external declaration,
2341 then any file-scope declaration should not
2342 have been static. */
2343 if (oldlocal
== 0 && oldglobal
!= 0
2344 && !TREE_PUBLIC (oldglobal
)
2345 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2346 warning ("`%s' locally external but globally static",
2347 IDENTIFIER_POINTER (name
));
2350 /* If we have a local external declaration,
2351 and no file-scope declaration has yet been seen,
2352 then if we later have a file-scope decl it must not be static. */
2354 && DECL_EXTERNAL (x
)
2358 TREE_PUBLIC (name
) = 1;
2360 /* Save this decl, so that we can do type checking against
2361 other decls after it falls out of scope.
2363 Only save it once. This prevents temporary decls created in
2364 expand_inline_function from being used here, since this
2365 will have been set when the inline function was parsed.
2366 It also helps give slightly better warnings. */
2367 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2368 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2371 /* Warn if shadowing an argument at the top level of the body. */
2372 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2373 /* This warning doesn't apply to the parms of a nested fcn. */
2374 && ! current_binding_level
->parm_flag
2375 /* Check that this is one level down from the parms. */
2376 && current_binding_level
->level_chain
->parm_flag
2377 /* Check that the decl being shadowed
2378 comes from the parm level, one level up. */
2379 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2381 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2382 pedwarn ("declaration of `%s' shadows a parameter",
2383 IDENTIFIER_POINTER (name
));
2385 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2386 IDENTIFIER_POINTER (name
));
2389 /* Maybe warn if shadowing something else. */
2390 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2391 /* No shadow warnings for internally generated vars. */
2392 && DECL_SOURCE_LINE (x
) != 0
2393 /* No shadow warnings for vars made for inlining. */
2394 && ! DECL_FROM_INLINE (x
))
2396 char *id
= IDENTIFIER_POINTER (name
);
2398 if (TREE_CODE (x
) == PARM_DECL
2399 && current_binding_level
->level_chain
->parm_flag
)
2400 /* Don't warn about the parm names in function declarator
2401 within a function declarator.
2402 It would be nice to avoid warning in any function
2403 declarator in a declaration, as opposed to a definition,
2404 but there is no way to tell it's not a definition. */
2406 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2407 warning ("declaration of `%s' shadows a parameter", id
);
2408 else if (oldlocal
!= 0)
2409 warning ("declaration of `%s' shadows previous local", id
);
2410 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2411 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2412 warning ("declaration of `%s' shadows global declaration", id
);
2415 /* If storing a local value, there may already be one (inherited).
2416 If so, record it for restoration when this binding level ends. */
2418 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2421 /* Keep count of variables in this level with incomplete type. */
2422 if (!COMPLETE_TYPE_P (TREE_TYPE (x
)))
2426 /* Put decls on list in reverse order.
2427 We will reverse them later if necessary. */
2428 TREE_CHAIN (x
) = b
->names
;
2434 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2437 pushdecl_top_level (x
)
2441 register struct binding_level
*b
= current_binding_level
;
2443 current_binding_level
= global_binding_level
;
2445 current_binding_level
= b
;
2449 /* Generate an implicit declaration for identifier FUNCTIONID
2450 as a function of type int (). Print a warning if appropriate. */
2453 implicitly_declare (functionid
)
2457 int traditional_warning
= 0;
2458 /* Only one "implicit declaration" warning per identifier. */
2459 int implicit_warning
;
2461 /* We used to reuse an old implicit decl here,
2462 but this loses with inline functions because it can clobber
2463 the saved decl chains. */
2464 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2465 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2467 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2469 /* Warn of implicit decl following explicit local extern decl.
2470 This is probably a program designed for traditional C. */
2471 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2472 traditional_warning
= 1;
2474 /* Warn once of an implicit declaration. */
2475 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2477 DECL_EXTERNAL (decl
) = 1;
2478 TREE_PUBLIC (decl
) = 1;
2480 /* Record that we have an implicit decl and this is it. */
2481 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2483 /* ANSI standard says implicit declarations are in the innermost block.
2484 So we record the decl in the standard fashion.
2485 If flag_traditional is set, pushdecl does it top-level. */
2488 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2489 maybe_objc_check_decl (decl
);
2491 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2493 if (mesg_implicit_function_declaration
&& implicit_warning
)
2495 if (mesg_implicit_function_declaration
== 2)
2496 error ("implicit declaration of function `%s'",
2497 IDENTIFIER_POINTER (functionid
));
2499 warning ("implicit declaration of function `%s'",
2500 IDENTIFIER_POINTER (functionid
));
2502 else if (warn_traditional
&& traditional_warning
)
2503 warning ("function `%s' was previously declared within a block",
2504 IDENTIFIER_POINTER (functionid
));
2506 /* Write a record describing this implicit function declaration to the
2507 prototypes file (if requested). */
2509 gen_aux_info_record (decl
, 0, 1, 0);
2514 /* Return zero if the declaration NEWDECL is valid
2515 when the declaration OLDDECL (assumed to be for the same name)
2516 has already been seen.
2517 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2518 and 3 if it is a conflicting declaration. */
2521 redeclaration_error_message (newdecl
, olddecl
)
2522 tree newdecl
, olddecl
;
2524 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2526 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2528 /* pushdecl creates distinct types for TYPE_DECLs by calling
2529 build_type_copy, so the above comparison generally fails. We do
2530 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2531 is equivalent to what this code used to do before the build_type_copy
2532 call. The variant type distinction should not matter for traditional
2533 code, because it doesn't have type qualifiers. */
2534 if (flag_traditional
2535 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2537 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2541 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2543 /* Declarations of functions can insist on internal linkage
2544 but they can't be inconsistent with internal linkage,
2545 so there can be no error on that account.
2546 However defining the same name twice is no good. */
2547 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2548 /* However, defining once as extern inline and a second
2549 time in another way is ok. */
2550 && ! (DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2551 && ! (DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2555 else if (current_binding_level
== global_binding_level
)
2557 /* Objects declared at top level: */
2558 /* If at least one is a reference, it's ok. */
2559 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2561 /* Reject two definitions. */
2562 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2564 /* Now we have two tentative defs, or one tentative and one real def. */
2565 /* Insist that the linkage match. */
2566 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2570 else if (current_binding_level
->parm_flag
2571 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2575 /* Newdecl has block scope. If olddecl has block scope also, then
2576 reject two definitions, and reject a definition together with an
2577 external reference. Otherwise, it is OK, because newdecl must
2578 be an extern reference to olddecl. */
2579 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2580 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2586 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2587 Create one if none exists so far for the current function.
2588 This function is called for both label definitions and label references. */
2594 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2596 if (current_function_decl
== 0)
2598 error ("label %s referenced outside of any function",
2599 IDENTIFIER_POINTER (id
));
2603 /* Use a label already defined or ref'd with this name. */
2606 /* But not if it is inherited and wasn't declared to be inheritable. */
2607 if (DECL_CONTEXT (decl
) != current_function_decl
2608 && ! C_DECLARED_LABEL_FLAG (decl
))
2609 return shadow_label (id
);
2613 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2615 /* Make sure every label has an rtx. */
2618 /* A label not explicitly declared must be local to where it's ref'd. */
2619 DECL_CONTEXT (decl
) = current_function_decl
;
2621 DECL_MODE (decl
) = VOIDmode
;
2623 /* Say where one reference is to the label,
2624 for the sake of the error if it is not defined. */
2625 DECL_SOURCE_LINE (decl
) = lineno
;
2626 DECL_SOURCE_FILE (decl
) = input_filename
;
2628 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2630 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2635 /* Make a label named NAME in the current function,
2636 shadowing silently any that may be inherited from containing functions
2637 or containing scopes.
2639 Note that valid use, if the label being shadowed
2640 comes from another scope in the same function,
2641 requires calling declare_nonlocal_label right away. */
2647 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2653 /* Check to make sure that the label hasn't already been declared
2654 at this label scope */
2655 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2656 if (TREE_VALUE (dup
) == decl
)
2658 error ("duplicate label declaration `%s'",
2659 IDENTIFIER_POINTER (name
));
2660 error_with_decl (TREE_VALUE (dup
),
2661 "this is a previous declaration");
2662 /* Just use the previous declaration. */
2663 return lookup_label (name
);
2666 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2667 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2670 return lookup_label (name
);
2673 /* Define a label, specifying the location in the source file.
2674 Return the LABEL_DECL node for the label, if the definition is valid.
2675 Otherwise return 0. */
2678 define_label (filename
, line
, name
)
2679 const char *filename
;
2683 tree decl
= lookup_label (name
);
2685 /* If label with this name is known from an outer context, shadow it. */
2686 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2688 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2689 IDENTIFIER_LABEL_VALUE (name
) = 0;
2690 decl
= lookup_label (name
);
2693 if (DECL_INITIAL (decl
) != 0)
2695 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2700 /* Mark label as having been defined. */
2701 DECL_INITIAL (decl
) = error_mark_node
;
2702 /* Say where in the source. */
2703 DECL_SOURCE_FILE (decl
) = filename
;
2704 DECL_SOURCE_LINE (decl
) = line
;
2709 /* Return the list of declarations of the current level.
2710 Note that this list is in reverse order unless/until
2711 you nreverse it; and when you do nreverse it, you must
2712 store the result back using `storedecls' or you will lose. */
2717 return current_binding_level
->names
;
2720 /* Return the list of type-tags (for structs, etc) of the current level. */
2725 return current_binding_level
->tags
;
2728 /* Store the list of declarations of the current level.
2729 This is done for the parameter declarations of a function being defined,
2730 after they are modified in the light of any missing parameters. */
2736 current_binding_level
->names
= decls
;
2739 /* Similarly, store the list of tags of the current level. */
2745 current_binding_level
->tags
= tags
;
2748 /* Given NAME, an IDENTIFIER_NODE,
2749 return the structure (or union or enum) definition for that name.
2750 Searches binding levels from BINDING_LEVEL up to the global level.
2751 If THISLEVEL_ONLY is nonzero, searches only the specified context
2752 (but skips any tag-transparent contexts to find one that is
2753 meaningful for tags).
2754 CODE says which kind of type the caller wants;
2755 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2756 If the wrong kind of type is found, an error is reported. */
2759 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2760 enum tree_code code
;
2761 struct binding_level
*binding_level
;
2765 register struct binding_level
*level
;
2767 for (level
= binding_level
; level
; level
= level
->level_chain
)
2770 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2772 if (TREE_PURPOSE (tail
) == name
)
2774 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2776 /* Definition isn't the kind we were looking for. */
2777 pending_invalid_xref
= name
;
2778 pending_invalid_xref_file
= input_filename
;
2779 pending_invalid_xref_line
= lineno
;
2781 return TREE_VALUE (tail
);
2784 if (thislevel_only
&& ! level
->tag_transparent
)
2790 /* Print an error message now
2791 for a recent invalid struct, union or enum cross reference.
2792 We don't print them immediately because they are not invalid
2793 when used in the `struct foo;' construct for shadowing. */
2796 pending_xref_error ()
2798 if (pending_invalid_xref
!= 0)
2799 error_with_file_and_line (pending_invalid_xref_file
,
2800 pending_invalid_xref_line
,
2801 "`%s' defined as wrong kind of tag",
2802 IDENTIFIER_POINTER (pending_invalid_xref
));
2803 pending_invalid_xref
= 0;
2806 /* Given a type, find the tag that was defined for it and return the tag name.
2807 Otherwise return 0. */
2810 lookup_tag_reverse (type
)
2813 register struct binding_level
*level
;
2815 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2818 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2820 if (TREE_VALUE (tail
) == type
)
2821 return TREE_PURPOSE (tail
);
2827 /* Look up NAME in the current binding level and its superiors
2828 in the namespace of variables, functions and typedefs.
2829 Return a ..._DECL node of some kind representing its definition,
2830 or return 0 if it is undefined. */
2837 if (current_binding_level
!= global_binding_level
2838 && IDENTIFIER_LOCAL_VALUE (name
))
2839 val
= IDENTIFIER_LOCAL_VALUE (name
);
2841 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2845 /* Similar to `lookup_name' but look only at current binding level. */
2848 lookup_name_current_level (name
)
2853 if (current_binding_level
== global_binding_level
)
2854 return IDENTIFIER_GLOBAL_VALUE (name
);
2856 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2859 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2860 if (DECL_NAME (t
) == name
)
2866 /* Mark ARG for GC. */
2869 mark_binding_level (arg
)
2872 struct binding_level
*level
= *(struct binding_level
**) arg
;
2874 for (; level
!= 0; level
= level
->level_chain
)
2876 ggc_mark_tree (level
->names
);
2877 ggc_mark_tree (level
->tags
);
2878 ggc_mark_tree (level
->shadowed
);
2879 ggc_mark_tree (level
->blocks
);
2880 ggc_mark_tree (level
->this_block
);
2881 ggc_mark_tree (level
->parm_order
);
2885 /* Create the predefined scalar types of C,
2886 and some nodes representing standard constants (0, 1, (void *) 0).
2887 Initialize the global binding level.
2888 Make definitions for built-in primitive functions. */
2891 init_decl_processing ()
2893 register tree endlink
;
2894 tree ptr_ftype_void
, ptr_ftype_ptr
;
2895 int wchar_type_size
;
2896 tree array_domain_type
;
2899 current_function_decl
= NULL
;
2900 named_labels
= NULL
;
2901 current_binding_level
= NULL_BINDING_LEVEL
;
2902 free_binding_level
= NULL_BINDING_LEVEL
;
2903 pushlevel (0); /* make the binding_level structure for global names */
2904 global_binding_level
= current_binding_level
;
2906 build_common_tree_nodes (flag_signed_char
);
2908 /* Define `int' and `char' first so that dbx will output them first. */
2909 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2910 integer_type_node
));
2911 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2913 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2914 long_integer_type_node
));
2915 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2916 unsigned_type_node
));
2917 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2918 long_unsigned_type_node
));
2919 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2920 long_long_integer_type_node
));
2921 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2922 long_long_unsigned_type_node
));
2923 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2924 short_integer_type_node
));
2925 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2926 short_unsigned_type_node
));
2927 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2928 signed_char_type_node
));
2929 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2930 unsigned_char_type_node
));
2931 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2932 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2933 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2934 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2935 #if HOST_BITS_PER_WIDE_INT >= 64
2936 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intTI_type_node
));
2938 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2939 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2940 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2941 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2942 #if HOST_BITS_PER_WIDE_INT >= 64
2943 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intTI_type_node
));
2946 /* `unsigned long' is the standard type for sizeof.
2947 Traditionally, use a signed type.
2948 Note that stddef.h uses `unsigned long',
2949 and this must agree, even if long and int are the same size. */
2950 t
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2951 if (flag_traditional
&& TREE_UNSIGNED (t
))
2952 t
= signed_type (t
);
2956 /* Create the widest literal types. */
2957 widest_integer_literal_type_node
2958 = make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
2959 widest_unsigned_literal_type_node
2960 = make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
2961 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2962 widest_integer_literal_type_node
));
2963 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2964 widest_unsigned_literal_type_node
));
2966 build_common_tree_nodes_2 (flag_short_double
);
2968 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2970 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2972 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2973 long_double_type_node
));
2974 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2975 complex_integer_type_node
));
2976 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2977 complex_float_type_node
));
2978 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2979 complex_double_type_node
));
2980 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2981 complex_long_double_type_node
));
2982 pushdecl (build_decl (TYPE_DECL
,
2983 ridpointers
[(int) RID_VOID
], void_type_node
));
2985 #ifdef MD_INIT_BUILTINS
2989 wchar_type_node
= get_identifier (flag_short_wchar
2990 ? "short unsigned int"
2992 wchar_type_node
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node
));
2993 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
2994 signed_wchar_type_node
= signed_type (wchar_type_node
);
2995 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
2997 boolean_type_node
= integer_type_node
;
2998 boolean_true_node
= integer_one_node
;
2999 boolean_false_node
= integer_zero_node
;
3001 string_type_node
= build_pointer_type (char_type_node
);
3002 const_string_type_node
3003 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3005 /* Make a type to be the domain of a few array types
3006 whose domains don't really matter.
3007 200 is small enough that it always fits in size_t
3008 and large enough that it can hold most function names for the
3009 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3010 array_domain_type
= build_index_type (build_int_2 (200, 0));
3012 /* make a type for arrays of characters.
3013 With luck nothing will ever really depend on the length of this
3015 char_array_type_node
3016 = build_array_type (char_type_node
, array_domain_type
);
3018 /* Likewise for arrays of ints. */
3020 = build_array_type (integer_type_node
, array_domain_type
);
3022 /* This is for wide string constants. */
3023 wchar_array_type_node
3024 = build_array_type (wchar_type_node
, array_domain_type
);
3026 record_component_aliases (char_array_type_node
);
3027 record_component_aliases (int_array_type_node
);
3028 record_component_aliases (wchar_array_type_node
);
3030 void_list_node
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3032 default_function_type
3033 = build_function_type (integer_type_node
, NULL_TREE
);
3035 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
3037 c_common_nodes_and_builtins (0, flag_no_builtin
, flag_no_nonansi_builtin
);
3039 endlink
= void_list_node
;
3040 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3042 = build_function_type (ptr_type_node
,
3043 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3045 /* Types which are common to the fortran compiler and libf2c. When
3046 changing these, you also need to be concerned with f/com.h. */
3048 if (TYPE_PRECISION (float_type_node
)
3049 == TYPE_PRECISION (long_integer_type_node
))
3051 g77_integer_type_node
= long_integer_type_node
;
3052 g77_uinteger_type_node
= long_unsigned_type_node
;
3054 else if (TYPE_PRECISION (float_type_node
)
3055 == TYPE_PRECISION (integer_type_node
))
3057 g77_integer_type_node
= integer_type_node
;
3058 g77_uinteger_type_node
= unsigned_type_node
;
3061 g77_integer_type_node
= g77_uinteger_type_node
= NULL_TREE
;
3063 if (g77_integer_type_node
!= NULL_TREE
)
3065 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_integer"),
3066 g77_integer_type_node
));
3067 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_uinteger"),
3068 g77_uinteger_type_node
));
3071 if (TYPE_PRECISION (float_type_node
) * 2
3072 == TYPE_PRECISION (long_integer_type_node
))
3074 g77_longint_type_node
= long_integer_type_node
;
3075 g77_ulongint_type_node
= long_unsigned_type_node
;
3077 else if (TYPE_PRECISION (float_type_node
) * 2
3078 == TYPE_PRECISION (long_long_integer_type_node
))
3080 g77_longint_type_node
= long_long_integer_type_node
;
3081 g77_ulongint_type_node
= long_long_unsigned_type_node
;
3084 g77_longint_type_node
= g77_ulongint_type_node
= NULL_TREE
;
3086 if (g77_longint_type_node
!= NULL_TREE
)
3088 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_longint"),
3089 g77_longint_type_node
));
3090 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_ulongint"),
3091 g77_ulongint_type_node
));
3094 builtin_function ("__builtin_aggregate_incoming_address",
3095 build_function_type (ptr_type_node
, NULL_TREE
),
3096 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
,
3097 BUILT_IN_NORMAL
, NULL_PTR
);
3099 /* Hooks for the DWARF 2 __throw routine. */
3100 builtin_function ("__builtin_unwind_init",
3101 build_function_type (void_type_node
, endlink
),
3102 BUILT_IN_UNWIND_INIT
, BUILT_IN_NORMAL
, NULL_PTR
);
3103 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void
,
3104 BUILT_IN_DWARF_CFA
, BUILT_IN_NORMAL
, NULL_PTR
);
3105 builtin_function ("__builtin_dwarf_fp_regnum",
3106 build_function_type (unsigned_type_node
, endlink
),
3107 BUILT_IN_DWARF_FP_REGNUM
, BUILT_IN_NORMAL
, NULL_PTR
);
3108 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr
,
3109 BUILT_IN_INIT_DWARF_REG_SIZES
, BUILT_IN_NORMAL
, NULL_PTR
);
3110 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3111 BUILT_IN_FROB_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3112 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3113 BUILT_IN_EXTRACT_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3115 ("__builtin_eh_return",
3116 build_function_type (void_type_node
,
3117 tree_cons (NULL_TREE
, ptr_type_node
,
3118 tree_cons (NULL_TREE
,
3119 type_for_mode (ptr_mode
, 0),
3120 tree_cons (NULL_TREE
,
3123 BUILT_IN_EH_RETURN
, BUILT_IN_NORMAL
, NULL_PTR
);
3125 pedantic_lvalues
= pedantic
;
3127 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3128 make_fname_decl
= c_make_fname_decl
;
3129 declare_function_name ();
3131 start_identifier_warnings ();
3133 /* Prepare to check format strings against argument lists. */
3134 init_function_format_info ();
3138 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3140 /* Record our roots. */
3142 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3143 ggc_add_tree_root (&named_labels
, 1);
3144 ggc_add_tree_root (&shadowed_labels
, 1);
3145 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3146 mark_binding_level
);
3147 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3148 mark_binding_level
);
3149 ggc_add_tree_root (&static_ctors
, 1);
3150 ggc_add_tree_root (&static_dtors
, 1);
3153 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3154 decl, NAME is the initialization string and TYPE_DEP indicates whether
3155 NAME depended on the type of the function. As we don't yet implement
3156 delayed emission of static data, we mark the decl as emitted
3157 so it is not placed in the output. Anything using it must therefore pull
3158 out the STRING_CST initializer directly. This does mean that these names
3159 are string merging candidates, which C99 does not permit. */
3162 c_make_fname_decl (id
, name
, type_dep
)
3165 int type_dep ATTRIBUTE_UNUSED
;
3167 tree decl
, type
, init
;
3168 size_t length
= strlen (name
);
3170 type
= build_array_type
3171 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
3172 build_index_type (build_int_2 (length
, 0)));
3174 decl
= build_decl (VAR_DECL
, id
, type
);
3175 TREE_STATIC (decl
) = 1;
3176 TREE_READONLY (decl
) = 1;
3177 TREE_ASM_WRITTEN (decl
) = 1;
3178 DECL_SOURCE_LINE (decl
) = 0;
3179 DECL_ARTIFICIAL (decl
) = 1;
3180 DECL_IN_SYSTEM_HEADER (decl
) = 1;
3181 DECL_IGNORED_P (decl
) = 1;
3182 init
= build_string (length
+ 1, name
);
3183 TREE_TYPE (init
) = type
;
3184 DECL_INITIAL (decl
) = init
;
3185 finish_decl (pushdecl (decl
), init
, NULL_TREE
);
3190 /* Return a definition for a builtin function named NAME and whose data type
3191 is TYPE. TYPE should be a function type with argument types.
3192 FUNCTION_CODE tells later passes how to compile calls to this function.
3193 See tree.h for its possible values.
3195 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3196 the name to be called if we can't opencode the function. */
3199 builtin_function (name
, type
, function_code
, class, library_name
)
3203 enum built_in_class
class;
3204 const char *library_name
;
3206 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3207 DECL_EXTERNAL (decl
) = 1;
3208 TREE_PUBLIC (decl
) = 1;
3209 /* If -traditional, permit redefining a builtin function any way you like.
3210 (Though really, if the program redefines these functions,
3211 it probably won't work right unless compiled with -fno-builtin.) */
3212 if (flag_traditional
&& name
[0] != '_')
3213 DECL_BUILT_IN_NONANSI (decl
) = 1;
3215 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3216 make_decl_rtl (decl
, NULL_PTR
, 1);
3218 DECL_BUILT_IN_CLASS (decl
) = class;
3219 DECL_FUNCTION_CODE (decl
) = function_code
;
3221 /* Warn if a function in the namespace for users
3222 is used without an occasion to consider it declared. */
3223 if (name
[0] != '_' || name
[1] != '_')
3224 C_DECL_ANTICIPATED (decl
) = 1;
3229 /* Called when a declaration is seen that contains no names to declare.
3230 If its type is a reference to a structure, union or enum inherited
3231 from a containing scope, shadow that tag name for the current scope
3232 with a forward reference.
3233 If its type defines a new named structure or union
3234 or defines an enum, it is valid but we need not do anything here.
3235 Otherwise, it is an error. */
3238 shadow_tag (declspecs
)
3241 shadow_tag_warned (declspecs
, 0);
3245 shadow_tag_warned (declspecs
, warned
)
3248 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3255 pending_invalid_xref
= 0;
3257 /* Remove the attributes from declspecs, since they will confuse the
3259 split_specs_attrs (declspecs
, &specs
, &attrs
);
3261 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3263 register tree value
= TREE_VALUE (link
);
3264 register enum tree_code code
= TREE_CODE (value
);
3266 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3267 /* Used to test also that TYPE_SIZE (value) != 0.
3268 That caused warning for `struct foo;' at top level in the file. */
3270 register tree name
= lookup_tag_reverse (value
);
3277 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3278 /* Empty unnamed enum OK */
3280 pedwarn ("unnamed struct/union that defines no instances");
3286 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3290 t
= make_node (code
);
3297 if (!warned
&& ! in_system_header
)
3299 warning ("useless keyword or type name in empty declaration");
3306 error ("two types specified in one empty declaration");
3311 pedwarn ("empty declaration");
3315 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3318 groktypename (typename
)
3321 if (TREE_CODE (typename
) != TREE_LIST
)
3323 return grokdeclarator (TREE_VALUE (typename
),
3324 TREE_PURPOSE (typename
),
3328 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3331 groktypename_in_parm_context (typename
)
3334 if (TREE_CODE (typename
) != TREE_LIST
)
3336 return grokdeclarator (TREE_VALUE (typename
),
3337 TREE_PURPOSE (typename
),
3341 /* Decode a declarator in an ordinary declaration or data definition.
3342 This is called as soon as the type information and variable name
3343 have been parsed, before parsing the initializer if any.
3344 Here we create the ..._DECL node, fill in its type,
3345 and put it on the list of decls for the current context.
3346 The ..._DECL node is returned as the value.
3348 Exception: for arrays where the length is not specified,
3349 the type is left null, to be filled in by `finish_decl'.
3351 Function definitions do not come here; they go to start_function
3352 instead. However, external and forward declarations of functions
3353 do go through here. Structure field declarations are done by
3354 grokfield and not through here. */
3357 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3358 tree declarator
, declspecs
;
3360 tree attributes
, prefix_attributes
;
3362 register tree decl
= grokdeclarator (declarator
, declspecs
,
3363 NORMAL
, initialized
);
3366 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3367 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl
)), "main"))
3368 warning_with_decl (decl
, "`%s' is usually a function");
3371 /* Is it valid for this decl to have an initializer at all?
3372 If not, set INITIALIZED to zero, which will indirectly
3373 tell `finish_decl' to ignore the initializer once it is parsed. */
3374 switch (TREE_CODE (decl
))
3377 /* typedef foo = bar means give foo the same type as bar.
3378 We haven't parsed bar yet, so `finish_decl' will fix that up.
3379 Any other case of an initialization in a TYPE_DECL is an error. */
3380 if (pedantic
|| list_length (declspecs
) > 1)
3382 error ("typedef `%s' is initialized",
3383 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3389 error ("function `%s' is initialized like a variable",
3390 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3395 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3396 error ("parameter `%s' is initialized",
3397 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3402 /* Don't allow initializations for incomplete types
3403 except for arrays which might be completed by the initialization. */
3404 if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3406 /* A complete type is ok if size is fixed. */
3408 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3409 || C_DECL_VARIABLE_SIZE (decl
))
3411 error ("variable-sized object may not be initialized");
3415 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3417 error ("variable `%s' has initializer but incomplete type",
3418 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3421 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
3423 error ("elements of array `%s' have incomplete type",
3424 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3431 #if 0 /* Seems redundant with grokdeclarator. */
3432 if (current_binding_level
!= global_binding_level
3433 && DECL_EXTERNAL (decl
)
3434 && TREE_CODE (decl
) != FUNCTION_DECL
)
3435 warning ("declaration of `%s' has `extern' and is initialized",
3436 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3438 DECL_EXTERNAL (decl
) = 0;
3439 if (current_binding_level
== global_binding_level
)
3440 TREE_STATIC (decl
) = 1;
3442 /* Tell `pushdecl' this is an initialized decl
3443 even though we don't yet have the initializer expression.
3444 Also tell `finish_decl' it may store the real initializer. */
3445 DECL_INITIAL (decl
) = error_mark_node
;
3448 /* If this is a function declaration, write a record describing it to the
3449 prototypes file (if requested). */
3451 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3452 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3454 /* ANSI specifies that a tentative definition which is not merged with
3455 a non-tentative definition behaves exactly like a definition with an
3456 initializer equal to zero. (Section 3.7.2)
3457 -fno-common gives strict ANSI behavior. Usually you don't want it.
3458 This matters only for variables with external linkage. */
3459 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3460 DECL_COMMON (decl
) = 1;
3462 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3463 SET_DEFAULT_DECL_ATTRIBUTES (decl
, attributes
);
3466 /* Set attributes here so if duplicate decl, will have proper attributes. */
3467 decl_attributes (decl
, attributes
, prefix_attributes
);
3469 /* Add this decl to the current binding level.
3470 TEM may equal DECL or it may be a previous decl of the same name. */
3471 tem
= pushdecl (decl
);
3473 /* For a local variable, define the RTL now. */
3474 if (current_binding_level
!= global_binding_level
3475 /* But not if this is a duplicate decl
3476 and we preserved the rtl from the previous one
3477 (which may or may not happen). */
3478 && DECL_RTL (tem
) == 0)
3480 if (COMPLETE_TYPE_P (TREE_TYPE (tem
)))
3482 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3483 && DECL_INITIAL (tem
) != 0)
3490 /* Finish processing of a declaration;
3491 install its initial value.
3492 If the length of an array type is not known before,
3493 it must be determined now, from the initial value, or it is an error. */
3496 finish_decl (decl
, init
, asmspec_tree
)
3500 register tree type
= TREE_TYPE (decl
);
3501 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3504 /* If a name was specified, get the string. */
3506 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3508 /* If `start_decl' didn't like having an initialization, ignore it now. */
3510 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3512 /* Don't crash if parm is initialized. */
3513 if (TREE_CODE (decl
) == PARM_DECL
)
3516 if (ITERATOR_P (decl
))
3519 error_with_decl (decl
, "iterator has no initial value");
3521 init
= save_expr (init
);
3526 if (TREE_CODE (decl
) != TYPE_DECL
)
3527 store_init_value (decl
, init
);
3530 /* typedef foo = bar; store the type of bar as the type of foo. */
3531 TREE_TYPE (decl
) = TREE_TYPE (init
);
3532 DECL_INITIAL (decl
) = init
= 0;
3536 /* Deduce size of array from initialization, if not already known */
3538 if (TREE_CODE (type
) == ARRAY_TYPE
3539 && TYPE_DOMAIN (type
) == 0
3540 && TREE_CODE (decl
) != TYPE_DECL
)
3543 = (TREE_STATIC (decl
)
3544 /* Even if pedantic, an external linkage array
3545 may have incomplete type at first. */
3546 ? pedantic
&& !TREE_PUBLIC (decl
)
3547 : !DECL_EXTERNAL (decl
));
3549 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3551 /* Get the completed type made by complete_array_type. */
3552 type
= TREE_TYPE (decl
);
3555 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3560 error_with_decl (decl
, "array size missing in `%s'");
3561 /* If a `static' var's size isn't known,
3562 make it extern as well as static, so it does not get
3564 If it is not `static', then do not mark extern;
3565 finish_incomplete_decl will give it a default size
3566 and it will get allocated. */
3567 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3568 DECL_EXTERNAL (decl
) = 1;
3571 /* TYPE_MAX_VALUE is always one less than the number of elements
3572 in the array, because we start counting at zero. Therefore,
3573 warn only if the value is less than zero. */
3574 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3575 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3576 error_with_decl (decl
, "zero or negative size array `%s'");
3578 layout_decl (decl
, 0);
3581 if (TREE_CODE (decl
) == VAR_DECL
)
3583 if (DECL_SIZE (decl
) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3584 layout_decl (decl
, 0);
3586 if (DECL_SIZE (decl
) == 0
3587 && (TREE_STATIC (decl
)
3589 /* A static variable with an incomplete type
3590 is an error if it is initialized.
3591 Also if it is not file scope.
3592 Otherwise, let it through, but if it is not `extern'
3593 then it may cause an error message later. */
3594 /* A duplicate_decls call could have changed an extern
3595 declaration into a file scope one. This can be detected
3596 by TREE_ASM_WRITTEN being set. */
3597 (DECL_INITIAL (decl
) != 0
3598 || (DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
)))
3600 /* An automatic variable with an incomplete type
3602 !DECL_EXTERNAL (decl
)))
3604 error_with_decl (decl
, "storage size of `%s' isn't known");
3605 TREE_TYPE (decl
) = error_mark_node
;
3608 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3609 && DECL_SIZE (decl
) != 0)
3611 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3612 constant_expression_warning (DECL_SIZE (decl
));
3614 error_with_decl (decl
, "storage size of `%s' isn't constant");
3617 if (TREE_USED (type
))
3618 TREE_USED (decl
) = 1;
3621 /* If this is a function and an assembler name is specified, it isn't
3622 builtin any more. Also reset DECL_RTL so we can give it its new
3624 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3626 DECL_BUILT_IN_CLASS (decl
) = NOT_BUILT_IN
;
3627 DECL_RTL (decl
) = 0;
3628 DECL_ASSEMBLER_NAME (decl
) = get_identifier (asmspec
);
3631 /* Output the assembler code and/or RTL code for variables and functions,
3632 unless the type is an undefined structure or union.
3633 If not, it will get done when the type is completed. */
3635 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3637 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3638 maybe_objc_check_decl (decl
);
3639 rest_of_decl_compilation (decl
, asmspec
,
3640 (DECL_CONTEXT (decl
) == 0
3641 || TREE_ASM_WRITTEN (decl
)), 0);
3643 if (DECL_CONTEXT (decl
) != 0)
3645 /* Recompute the RTL of a local array now
3646 if it used to be an incomplete type. */
3648 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3650 /* If we used it already as memory, it must stay in memory. */
3651 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3652 /* If it's still incomplete now, no init will save it. */
3653 if (DECL_SIZE (decl
) == 0)
3654 DECL_INITIAL (decl
) = 0;
3657 /* Compute and store the initial value. */
3658 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3659 expand_decl_init (decl
);
3663 if (TREE_CODE (decl
) == TYPE_DECL
)
3665 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3666 maybe_objc_check_decl (decl
);
3667 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0, 0);
3670 /* At the end of a declaration, throw away any variable type sizes
3671 of types defined inside that declaration. There is no use
3672 computing them in the following function definition. */
3673 if (current_binding_level
== global_binding_level
)
3674 get_pending_sizes ();
3677 /* If DECL has a cleanup, build and return that cleanup here.
3678 This is a callback called by expand_expr. */
3681 maybe_build_cleanup (decl
)
3682 tree decl ATTRIBUTE_UNUSED
;
3684 /* There are no cleanups in C. */
3688 /* Given a parsed parameter declaration,
3689 decode it into a PARM_DECL and push that on the current binding level.
3690 Also, for the sake of forward parm decls,
3691 record the given order of parms in `parm_order'. */
3694 push_parm_decl (parm
)
3698 int old_immediate_size_expand
= immediate_size_expand
;
3699 /* Don't try computing parm sizes now -- wait till fn is called. */
3700 immediate_size_expand
= 0;
3702 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3703 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3704 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3705 TREE_PURPOSE (TREE_VALUE (parm
)));
3708 if (DECL_NAME (decl
))
3711 olddecl
= lookup_name (DECL_NAME (decl
));
3712 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3713 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3717 decl
= pushdecl (decl
);
3719 immediate_size_expand
= old_immediate_size_expand
;
3721 current_binding_level
->parm_order
3722 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3724 /* Add this decl to the current binding level. */
3725 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3728 /* Clear the given order of parms in `parm_order'.
3729 Used at start of parm list,
3730 and also at semicolon terminating forward decls. */
3735 current_binding_level
->parm_order
= NULL_TREE
;
3738 /* Make TYPE a complete type based on INITIAL_VALUE.
3739 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3740 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3743 complete_array_type (type
, initial_value
, do_default
)
3748 register tree maxindex
= NULL_TREE
;
3753 /* Note MAXINDEX is really the maximum index,
3754 one less than the size. */
3755 if (TREE_CODE (initial_value
) == STRING_CST
)
3758 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3759 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3762 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3764 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3765 maxindex
= build_int_2 (-1, -1);
3766 for (; elts
; elts
= TREE_CHAIN (elts
))
3768 if (TREE_PURPOSE (elts
))
3769 maxindex
= TREE_PURPOSE (elts
);
3771 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3772 maxindex
, integer_one_node
));
3774 maxindex
= copy_node (maxindex
);
3778 /* Make an error message unless that happened already. */
3779 if (initial_value
!= error_mark_node
)
3782 /* Prevent further error messages. */
3783 maxindex
= build_int_2 (0, 0);
3790 maxindex
= build_int_2 (0, 0);
3796 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3797 if (!TREE_TYPE (maxindex
))
3798 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3801 /* Lay out the type now that we can get the real answer. */
3808 /* Given declspecs and a declarator,
3809 determine the name and type of the object declared
3810 and construct a ..._DECL node for it.
3811 (In one case we can return a ..._TYPE node instead.
3812 For invalid input we sometimes return 0.)
3814 DECLSPECS is a chain of tree_list nodes whose value fields
3815 are the storage classes and type specifiers.
3817 DECL_CONTEXT says which syntactic context this declaration is in:
3818 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3819 FUNCDEF for a function definition. Like NORMAL but a few different
3820 error messages in each case. Return value may be zero meaning
3821 this definition is too screwy to try to parse.
3822 PARM for a parameter declaration (either within a function prototype
3823 or before a function body). Make a PARM_DECL, or return void_type_node.
3824 TYPENAME if for a typename (in a cast or sizeof).
3825 Don't make a DECL node; just return the ..._TYPE node.
3826 FIELD for a struct or union field; make a FIELD_DECL.
3827 BITFIELD for a field with specified width.
3828 INITIALIZED is 1 if the decl has an initializer.
3830 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3831 It may also be so in the PARM case, for a prototype where the
3832 argument type is specified but not the name.
3834 This function is where the complicated C meanings of `static'
3835 and `extern' are interpreted. */
3838 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
3841 enum decl_context decl_context
;
3846 tree type
= NULL_TREE
;
3851 int type_quals
= TYPE_UNQUALIFIED
;
3853 int explicit_int
= 0;
3854 int explicit_char
= 0;
3855 int defaulted_int
= 0;
3856 tree typedef_decl
= 0;
3858 tree typedef_type
= 0;
3859 int funcdef_flag
= 0;
3860 enum tree_code innermost_code
= ERROR_MARK
;
3862 int size_varies
= 0;
3863 tree decl_machine_attr
= NULL_TREE
;
3865 if (decl_context
== BITFIELD
)
3866 bitfield
= 1, decl_context
= FIELD
;
3868 if (decl_context
== FUNCDEF
)
3869 funcdef_flag
= 1, decl_context
= NORMAL
;
3871 /* Look inside a declarator for the name being declared
3872 and get it as a string, for an error message. */
3874 register tree decl
= declarator
;
3878 switch (TREE_CODE (decl
))
3883 innermost_code
= TREE_CODE (decl
);
3884 decl
= TREE_OPERAND (decl
, 0);
3887 case IDENTIFIER_NODE
:
3888 name
= IDENTIFIER_POINTER (decl
);
3899 /* A function definition's declarator must have the form of
3900 a function declarator. */
3902 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3905 /* Anything declared one level down from the top level
3906 must be one of the parameters of a function
3907 (because the body is at least two levels down). */
3909 /* If this looks like a function definition, make it one,
3910 even if it occurs where parms are expected.
3911 Then store_parm_decls will reject it and not use it as a parm. */
3912 if (decl_context
== NORMAL
&& !funcdef_flag
3913 && current_binding_level
->parm_flag
)
3914 decl_context
= PARM
;
3916 /* Look through the decl specs and record which ones appear.
3917 Some typespecs are defined as built-in typenames.
3918 Others, the ones that are modifiers of other types,
3919 are represented by bits in SPECBITS: set the bits for
3920 the modifiers that appear. Storage class keywords are also in SPECBITS.
3922 If there is a typedef name or a type, store the type in TYPE.
3923 This includes builtin typedefs such as `int'.
3925 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3926 and did not come from a user typedef.
3928 Set LONGLONG if `long' is mentioned twice. */
3930 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3933 register tree id
= TREE_VALUE (spec
);
3935 if (id
== ridpointers
[(int) RID_INT
])
3937 if (id
== ridpointers
[(int) RID_CHAR
])
3940 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3941 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
3943 if (ridpointers
[i
] == id
)
3945 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
3948 error ("`long long long' is too long for GCC");
3951 if (pedantic
&& ! in_system_header
&& warn_long_long
)
3952 pedwarn ("ANSI C does not support `long long'");
3956 else if (specbits
& (1 << i
))
3957 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3963 error ("two or more data types in declaration of `%s'", name
);
3964 /* Actual typedefs come to us as TYPE_DECL nodes. */
3965 else if (TREE_CODE (id
) == TYPE_DECL
)
3967 type
= TREE_TYPE (id
);
3968 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
3971 /* Built-in types come as identifiers. */
3972 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3974 register tree t
= lookup_name (id
);
3975 if (TREE_TYPE (t
) == error_mark_node
)
3977 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3978 error ("`%s' fails to be a typedef or built in type",
3979 IDENTIFIER_POINTER (id
));
3982 type
= TREE_TYPE (t
);
3986 else if (TREE_CODE (id
) != ERROR_MARK
)
3992 typedef_type
= type
;
3994 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3996 /* No type at all: default to `int', and set DEFAULTED_INT
3997 because it was not a user-defined typedef. */
4001 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4002 | (1 << (int) RID_SIGNED
)
4003 | (1 << (int) RID_UNSIGNED
))))
4004 /* Don't warn about typedef foo = bar. */
4005 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4006 && ! in_system_header
)
4008 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4009 and this is a function, or if -Wimplicit; prefer the former
4010 warning since it is more explicit. */
4011 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4012 warn_about_return_type
= 1;
4013 else if (warn_implicit_int
|| flag_isoc99
)
4014 warning ("type defaults to `int' in declaration of `%s'", name
);
4018 type
= integer_type_node
;
4021 /* Now process the modifiers that were specified
4022 and check for invalid combinations. */
4024 /* Long double is a special combination. */
4026 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4027 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4029 specbits
&= ~ (1 << (int) RID_LONG
);
4030 type
= long_double_type_node
;
4033 /* Check all other uses of type modifiers. */
4035 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4036 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4040 if ((specbits
& 1 << (int) RID_LONG
)
4041 && (specbits
& 1 << (int) RID_SHORT
))
4042 error ("both long and short specified for `%s'", name
);
4043 else if (((specbits
& 1 << (int) RID_LONG
)
4044 || (specbits
& 1 << (int) RID_SHORT
))
4046 error ("long or short specified with char for `%s'", name
);
4047 else if (((specbits
& 1 << (int) RID_LONG
)
4048 || (specbits
& 1 << (int) RID_SHORT
))
4049 && TREE_CODE (type
) == REAL_TYPE
)
4051 static int already
= 0;
4053 error ("long or short specified with floating type for `%s'", name
);
4054 if (! already
&& ! pedantic
)
4056 error ("the only valid combination is `long double'");
4060 else if ((specbits
& 1 << (int) RID_SIGNED
)
4061 && (specbits
& 1 << (int) RID_UNSIGNED
))
4062 error ("both signed and unsigned specified for `%s'", name
);
4063 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4064 error ("long, short, signed or unsigned invalid for `%s'", name
);
4068 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4070 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4072 if (flag_pedantic_errors
)
4077 /* Discard the type modifiers if they are invalid. */
4080 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4081 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4086 if ((specbits
& (1 << (int) RID_COMPLEX
))
4087 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4089 error ("complex invalid for `%s'", name
);
4090 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4093 /* Decide whether an integer type is signed or not.
4094 Optionally treat bitfields as signed by default. */
4095 if (specbits
& 1 << (int) RID_UNSIGNED
4096 /* Traditionally, all bitfields are unsigned. */
4097 || (bitfield
&& flag_traditional
4098 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4099 || (bitfield
&& ! flag_signed_bitfields
4100 && (explicit_int
|| defaulted_int
|| explicit_char
4101 /* A typedef for plain `int' without `signed'
4102 can be controlled just like plain `int'. */
4103 || ! (typedef_decl
!= 0
4104 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4105 && TREE_CODE (type
) != ENUMERAL_TYPE
4106 && !(specbits
& 1 << (int) RID_SIGNED
)))
4109 type
= long_long_unsigned_type_node
;
4110 else if (specbits
& 1 << (int) RID_LONG
)
4111 type
= long_unsigned_type_node
;
4112 else if (specbits
& 1 << (int) RID_SHORT
)
4113 type
= short_unsigned_type_node
;
4114 else if (type
== char_type_node
)
4115 type
= unsigned_char_type_node
;
4116 else if (typedef_decl
)
4117 type
= unsigned_type (type
);
4119 type
= unsigned_type_node
;
4121 else if ((specbits
& 1 << (int) RID_SIGNED
)
4122 && type
== char_type_node
)
4123 type
= signed_char_type_node
;
4125 type
= long_long_integer_type_node
;
4126 else if (specbits
& 1 << (int) RID_LONG
)
4127 type
= long_integer_type_node
;
4128 else if (specbits
& 1 << (int) RID_SHORT
)
4129 type
= short_integer_type_node
;
4131 if (specbits
& 1 << (int) RID_COMPLEX
)
4133 /* If we just have "complex", it is equivalent to
4134 "complex double", but if any modifiers at all are specified it is
4135 the complex form of TYPE. E.g, "complex short" is
4136 "complex short int". */
4138 if (defaulted_int
&& ! longlong
4139 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4140 | (1 << (int) RID_SIGNED
)
4141 | (1 << (int) RID_UNSIGNED
))))
4142 type
= complex_double_type_node
;
4143 else if (type
== integer_type_node
)
4144 type
= complex_integer_type_node
;
4145 else if (type
== float_type_node
)
4146 type
= complex_float_type_node
;
4147 else if (type
== double_type_node
)
4148 type
= complex_double_type_node
;
4149 else if (type
== long_double_type_node
)
4150 type
= complex_long_double_type_node
;
4152 type
= build_complex_type (type
);
4155 /* Figure out the type qualifiers for the declaration. There are
4156 two ways a declaration can become qualified. One is something
4157 like `const int i' where the `const' is explicit. Another is
4158 something like `typedef const int CI; CI i' where the type of the
4159 declaration contains the `const'. */
4160 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4161 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4162 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4163 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4165 pedwarn ("duplicate `const'");
4167 pedwarn ("duplicate `restrict'");
4169 pedwarn ("duplicate `volatile'");
4170 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4171 type
= TYPE_MAIN_VARIANT (type
);
4172 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4173 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4174 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4176 /* Warn if two storage classes are given. Default to `auto'. */
4181 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4182 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4183 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4184 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4185 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4186 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4188 /* Warn about storage classes that are invalid for certain
4189 kinds of declarations (parameters, typenames, etc.). */
4192 error ("multiple storage classes in declaration of `%s'", name
);
4193 else if (funcdef_flag
4195 & ((1 << (int) RID_REGISTER
)
4196 | (1 << (int) RID_AUTO
)
4197 | (1 << (int) RID_TYPEDEF
))))
4199 if (specbits
& 1 << (int) RID_AUTO
4200 && (pedantic
|| current_binding_level
== global_binding_level
))
4201 pedwarn ("function definition declared `auto'");
4202 if (specbits
& 1 << (int) RID_REGISTER
)
4203 error ("function definition declared `register'");
4204 if (specbits
& 1 << (int) RID_TYPEDEF
)
4205 error ("function definition declared `typedef'");
4206 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4207 | (1 << (int) RID_AUTO
));
4209 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4211 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4215 switch (decl_context
)
4218 error ("storage class specified for structure field `%s'", name
);
4221 error ("storage class specified for parameter `%s'", name
);
4224 error ("storage class specified for typename");
4227 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4228 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4229 | (1 << (int) RID_EXTERN
));
4232 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4234 /* `extern' with initialization is invalid if not at top level. */
4235 if (current_binding_level
== global_binding_level
)
4236 warning ("`%s' initialized and declared `extern'", name
);
4238 error ("`%s' has both `extern' and initializer", name
);
4240 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4241 && current_binding_level
!= global_binding_level
)
4242 error ("nested function `%s' declared `extern'", name
);
4243 else if (current_binding_level
== global_binding_level
4244 && specbits
& (1 << (int) RID_AUTO
))
4245 error ("top-level declaration of `%s' specifies `auto'", name
);
4246 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4247 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4249 error ("iterator `%s' has derived type", name
);
4250 type
= error_mark_node
;
4252 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4253 && TREE_CODE (type
) != INTEGER_TYPE
)
4255 error ("iterator `%s' has noninteger type", name
);
4256 type
= error_mark_node
;
4260 /* Now figure out the structure of the declarator proper.
4261 Descend through it, creating more complex types, until we reach
4262 the declared identifier (or NULL_TREE, in an absolute declarator). */
4264 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4266 if (type
== error_mark_node
)
4268 declarator
= TREE_OPERAND (declarator
, 0);
4272 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4273 an INDIRECT_REF (for *...),
4274 a CALL_EXPR (for ...(...)),
4275 an identifier (for the name being declared)
4276 or a null pointer (for the place in an absolute declarator
4277 where the name was omitted).
4278 For the last two cases, we have just exited the loop.
4280 At this point, TYPE is the type of elements of an array,
4281 or for a function to return, or for a pointer to point to.
4282 After this sequence of ifs, TYPE is the type of the
4283 array or function or pointer, and DECLARATOR has had its
4284 outermost layer removed. */
4286 if (TREE_CODE (declarator
) == ARRAY_REF
)
4288 register tree itype
= NULL_TREE
;
4289 register tree size
= TREE_OPERAND (declarator
, 1);
4290 /* The index is a signed object `sizetype' bits wide. */
4291 tree index_type
= signed_type (sizetype
);
4293 declarator
= TREE_OPERAND (declarator
, 0);
4295 /* Check for some types that there cannot be arrays of. */
4297 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4299 error ("declaration of `%s' as array of voids", name
);
4300 type
= error_mark_node
;
4303 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4305 error ("declaration of `%s' as array of functions", name
);
4306 type
= error_mark_node
;
4309 if (size
== error_mark_node
)
4310 type
= error_mark_node
;
4312 if (type
== error_mark_node
)
4315 /* If size was specified, set ITYPE to a range-type for that size.
4316 Otherwise, ITYPE remains null. finish_decl may figure it out
4317 from an initial value. */
4321 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4322 STRIP_TYPE_NOPS (size
);
4324 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4325 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4327 error ("size of array `%s' has non-integer type", name
);
4328 size
= integer_one_node
;
4331 if (pedantic
&& integer_zerop (size
))
4332 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4334 if (TREE_CODE (size
) == INTEGER_CST
)
4336 constant_expression_warning (size
);
4337 if (tree_int_cst_sgn (size
) < 0)
4339 error ("size of array `%s' is negative", name
);
4340 size
= integer_one_node
;
4345 /* Make sure the array size remains visibly nonconstant
4346 even if it is (eg) a const variable with known value. */
4351 if (TREE_CONSTANT (size
))
4352 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4354 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4358 /* Convert size to index_type, so that if it is a variable
4359 the computations will be done in the proper mode. */
4360 itype
= fold (build (MINUS_EXPR
, index_type
,
4361 convert (index_type
, size
),
4362 convert (index_type
, size_one_node
)));
4364 /* If that overflowed, the array is too big.
4365 ??? While a size of INT_MAX+1 technically shouldn't cause
4366 an overflow (because we subtract 1), the overflow is recorded
4367 during the conversion to index_type, before the subtraction.
4368 Handling this case seems like an unnecessary complication. */
4369 if (TREE_OVERFLOW (itype
))
4371 error ("size of array `%s' is too large", name
);
4372 type
= error_mark_node
;
4377 itype
= variable_size (itype
);
4378 itype
= build_index_type (itype
);
4381 #if 0 /* This had bad results for pointers to arrays, as in
4382 union incomplete (*foo)[4]; */
4383 /* Complain about arrays of incomplete types, except in typedefs. */
4385 if (!COMPLETE_TYPE_P (type
)
4386 /* Avoid multiple warnings for nested array types. */
4387 && TREE_CODE (type
) != ARRAY_TYPE
4388 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4389 && !C_TYPE_BEING_DEFINED (type
))
4390 warning ("array type has incomplete element type");
4393 #if 0 /* We shouldn't have a function type here at all!
4394 Functions aren't allowed as array elements. */
4395 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4396 && (constp
|| volatilep
))
4397 pedwarn ("ANSI C forbids const or volatile function types");
4400 /* Build the array type itself, then merge any constancy or
4401 volatility into the target type. We must do it in this order
4402 to ensure that the TYPE_MAIN_VARIANT field of the array type
4403 is set correctly. */
4405 type
= build_array_type (type
, itype
);
4407 type
= c_build_qualified_type (type
, type_quals
);
4408 record_component_aliases (type
);
4410 #if 0 /* don't clear these; leave them set so that the array type
4411 or the variable is itself const or volatile. */
4412 type_quals
= TYPE_UNQUALIFIED
;
4416 C_TYPE_VARIABLE_SIZE (type
) = 1;
4418 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4422 /* Declaring a function type.
4423 Make sure we have a valid type for the function to return. */
4424 if (type
== error_mark_node
)
4429 /* Warn about some types functions can't return. */
4431 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4433 error ("`%s' declared as function returning a function", name
);
4434 type
= integer_type_node
;
4436 if (TREE_CODE (type
) == ARRAY_TYPE
)
4438 error ("`%s' declared as function returning an array", name
);
4439 type
= integer_type_node
;
4442 #ifndef TRADITIONAL_RETURN_FLOAT
4443 /* Traditionally, declaring return type float means double. */
4445 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4446 type
= double_type_node
;
4447 #endif /* TRADITIONAL_RETURN_FLOAT */
4449 /* Construct the function type and go to the next
4450 inner layer of declarator. */
4452 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4454 /* Say it's a definition
4455 only for the CALL_EXPR
4456 closest to the identifier. */
4457 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4458 /* Type qualifiers before the return type of the function
4459 qualify the return type, not the function type. */
4461 type
= c_build_qualified_type (type
, type_quals
);
4462 type_quals
= TYPE_UNQUALIFIED
;
4464 type
= build_function_type (type
, arg_types
);
4465 declarator
= TREE_OPERAND (declarator
, 0);
4467 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4468 the formal parameter list of this FUNCTION_TYPE to point to
4469 the FUNCTION_TYPE node itself. */
4474 for (link
= last_function_parm_tags
;
4476 link
= TREE_CHAIN (link
))
4477 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4480 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4482 /* Merge any constancy or volatility into the target type
4485 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4487 pedwarn ("ANSI C forbids qualified function types");
4489 type
= c_build_qualified_type (type
, type_quals
);
4490 type_quals
= TYPE_UNQUALIFIED
;
4493 type
= build_pointer_type (type
);
4495 /* Process a list of type modifier keywords
4496 (such as const or volatile) that were given inside the `*'. */
4498 if (TREE_TYPE (declarator
))
4500 register tree typemodlist
;
4506 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4507 typemodlist
= TREE_CHAIN (typemodlist
))
4509 tree qualifier
= TREE_VALUE (typemodlist
);
4511 if (qualifier
== ridpointers
[(int) RID_CONST
])
4513 else if (qualifier
== ridpointers
[(int) RID_VOLATILE
])
4515 else if (qualifier
== ridpointers
[(int) RID_RESTRICT
])
4520 error ("invalid type modifier within pointer declarator");
4524 pedwarn ("duplicate `const'");
4526 pedwarn ("duplicate `volatile'");
4528 pedwarn ("duplicate `restrict'");
4530 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4531 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4532 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4535 declarator
= TREE_OPERAND (declarator
, 0);
4542 /* Now TYPE has the actual type. */
4544 /* Did array size calculations overflow? */
4546 if (TREE_CODE (type
) == ARRAY_TYPE
4547 && COMPLETE_TYPE_P (type
)
4548 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4549 error ("size of array `%s' is too large", name
);
4551 /* If this is declaring a typedef name, return a TYPE_DECL. */
4553 if (specbits
& (1 << (int) RID_TYPEDEF
))
4556 /* Note that the grammar rejects storage classes
4557 in typenames, fields or parameters */
4558 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4560 pedwarn ("ANSI C forbids qualified function types");
4562 type
= c_build_qualified_type (type
, type_quals
);
4563 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4564 if ((specbits
& (1 << (int) RID_SIGNED
))
4565 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4566 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4570 /* Detect the case of an array type of unspecified size
4571 which came, as such, direct from a typedef name.
4572 We must copy the type, so that each identifier gets
4573 a distinct type, so that each identifier's size can be
4574 controlled separately by its own initializer. */
4576 if (type
!= 0 && typedef_type
!= 0
4577 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4578 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4580 type
= build_array_type (TREE_TYPE (type
), 0);
4581 record_component_aliases (type
);
4583 C_TYPE_VARIABLE_SIZE (type
) = 1;
4586 /* If this is a type name (such as, in a cast or sizeof),
4587 compute the type and return it now. */
4589 if (decl_context
== TYPENAME
)
4591 /* Note that the grammar rejects storage classes
4592 in typenames, fields or parameters */
4593 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4595 pedwarn ("ANSI C forbids const or volatile function types");
4597 type
= c_build_qualified_type (type
, type_quals
);
4601 /* Aside from typedefs and type names (handle above),
4602 `void' at top level (not within pointer)
4603 is allowed only in public variables.
4604 We don't complain about parms either, but that is because
4605 a better error message can be made later. */
4607 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4608 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4609 && ((specbits
& (1 << (int) RID_EXTERN
))
4610 || (current_binding_level
== global_binding_level
4612 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4614 error ("variable or field `%s' declared void", name
);
4615 type
= integer_type_node
;
4618 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4619 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4624 if (decl_context
== PARM
)
4626 tree type_as_written
= type
;
4629 /* A parameter declared as an array of T is really a pointer to T.
4630 One declared as a function is really a pointer to a function. */
4632 if (TREE_CODE (type
) == ARRAY_TYPE
)
4634 /* Transfer const-ness of array into that of type pointed to. */
4635 type
= TREE_TYPE (type
);
4637 type
= c_build_qualified_type (type
, type_quals
);
4638 type
= build_pointer_type (type
);
4639 type_quals
= TYPE_UNQUALIFIED
;
4642 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4644 if (pedantic
&& type_quals
)
4645 pedwarn ("ANSI C forbids qualified function types");
4647 type
= c_build_qualified_type (type
, type_quals
);
4648 type
= build_pointer_type (type
);
4649 type_quals
= TYPE_UNQUALIFIED
;
4652 decl
= build_decl (PARM_DECL
, declarator
, type
);
4654 C_DECL_VARIABLE_SIZE (decl
) = 1;
4656 /* Compute the type actually passed in the parmlist,
4657 for the case where there is no prototype.
4658 (For example, shorts and chars are passed as ints.)
4659 When there is a prototype, this is overridden later. */
4661 if (type
== error_mark_node
)
4662 promoted_type
= type
;
4665 promoted_type
= simple_type_promotes_to (type
);
4666 if (! promoted_type
)
4667 promoted_type
= type
;
4670 DECL_ARG_TYPE (decl
) = promoted_type
;
4671 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4673 else if (decl_context
== FIELD
)
4675 /* Structure field. It may not be a function. */
4677 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4679 error ("field `%s' declared as a function", name
);
4680 type
= build_pointer_type (type
);
4682 else if (TREE_CODE (type
) != ERROR_MARK
4683 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4685 error ("field `%s' has incomplete type", name
);
4686 type
= error_mark_node
;
4688 /* Move type qualifiers down to element of an array. */
4689 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4691 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4693 TYPE_DOMAIN (type
));
4694 record_component_aliases (type
);
4695 #if 0 /* Leave the field const or volatile as well. */
4696 type_quals
= TYPE_UNQUALIFIED
;
4699 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4700 TREE_ADDRESSABLE (decl
) = ! bitfield
;
4702 C_DECL_VARIABLE_SIZE (decl
) = 1;
4704 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4706 /* Every function declaration is "external"
4707 except for those which are inside a function body
4708 in which `auto' is used.
4709 That is a case not specified by ANSI C,
4710 and we use it for forward declarations for nested functions. */
4711 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4712 || current_binding_level
== global_binding_level
);
4714 if (specbits
& (1 << (int) RID_AUTO
)
4715 && (pedantic
|| current_binding_level
== global_binding_level
))
4716 pedwarn ("invalid storage class for function `%s'", name
);
4717 if (specbits
& (1 << (int) RID_REGISTER
))
4718 error ("invalid storage class for function `%s'", name
);
4719 /* Function declaration not at top level.
4720 Storage classes other than `extern' are not allowed
4721 and `extern' makes no difference. */
4722 if (current_binding_level
!= global_binding_level
4723 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4725 pedwarn ("invalid storage class for function `%s'", name
);
4727 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4728 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4730 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4731 pedwarn ("ANSI C forbids qualified function types");
4734 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl
))) == void_type_node
4735 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl
)))
4736 && ! DECL_IN_SYSTEM_HEADER (decl
))
4737 pedwarn ("ANSI C forbids qualified void function return type");
4739 /* GNU C interprets a `volatile void' return type to indicate
4740 that the function does not return. */
4741 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4742 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
4743 warning ("`noreturn' function returns non-void value");
4746 DECL_EXTERNAL (decl
) = 1;
4747 /* Record absence of global scope for `static' or `auto'. */
4749 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4751 /* Record presence of `inline', if it is reasonable. */
4754 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4755 warning ("cannot inline function `main'");
4757 /* Assume that otherwise the function can be inlined. */
4758 DECL_INLINE (decl
) = 1;
4760 if (specbits
& (1 << (int) RID_EXTERN
))
4761 current_extern_inline
= 1;
4766 /* It's a variable. */
4767 /* An uninitialized decl with `extern' is a reference. */
4768 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4770 /* Move type qualifiers down to element of an array. */
4771 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4773 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4775 TYPE_DOMAIN (type
));
4776 record_component_aliases (type
);
4777 #if 0 /* Leave the variable const or volatile as well. */
4778 type_quals
= TYPE_UNQUALIFIED
;
4782 decl
= build_decl (VAR_DECL
, declarator
, type
);
4784 C_DECL_VARIABLE_SIZE (decl
) = 1;
4787 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4789 DECL_EXTERNAL (decl
) = extern_ref
;
4790 /* At top level, the presence of a `static' or `register' storage
4791 class specifier, or the absence of all storage class specifiers
4792 makes this declaration a definition (perhaps tentative). Also,
4793 the absence of both `static' and `register' makes it public. */
4794 if (current_binding_level
== global_binding_level
)
4798 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4799 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4801 /* Not at top level, only `static' makes a static definition. */
4804 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4805 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4808 if (specbits
& 1 << (int) RID_ITERATOR
)
4809 ITERATOR_P (decl
) = 1;
4812 /* Record `register' declaration for warnings on &
4813 and in case doing stupid register allocation. */
4815 if (specbits
& (1 << (int) RID_REGISTER
))
4816 DECL_REGISTER (decl
) = 1;
4818 /* Record constancy and volatility. */
4819 c_apply_type_quals_to_decl (type_quals
, decl
);
4821 /* If a type has volatile components, it should be stored in memory.
4822 Otherwise, the fact that those components are volatile
4823 will be ignored, and would even crash the compiler. */
4824 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4825 mark_addressable (decl
);
4831 /* Decode the parameter-list info for a function type or function definition.
4832 The argument is the value returned by `get_parm_info' (or made in parse.y
4833 if there is an identifier list instead of a parameter decl list).
4834 These two functions are separate because when a function returns
4835 or receives functions then each is called multiple times but the order
4836 of calls is different. The last call to `grokparms' is always the one
4837 that contains the formal parameter names of a function definition.
4839 Store in `last_function_parms' a chain of the decls of parms.
4840 Also store in `last_function_parm_tags' a chain of the struct, union,
4841 and enum tags declared among the parms.
4843 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4845 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4846 a mere declaration. A nonempty identifier-list gets an error message
4847 when FUNCDEF_FLAG is zero. */
4850 grokparms (parms_info
, funcdef_flag
)
4854 tree first_parm
= TREE_CHAIN (parms_info
);
4856 last_function_parms
= TREE_PURPOSE (parms_info
);
4857 last_function_parm_tags
= TREE_VALUE (parms_info
);
4859 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4860 && !in_system_header
)
4861 warning ("function declaration isn't a prototype");
4864 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4867 pedwarn ("parameter names (without types) in function declaration");
4869 last_function_parms
= first_parm
;
4876 /* We no longer test FUNCDEF_FLAG.
4877 If the arg types are incomplete in a declaration,
4878 they must include undefined tags.
4879 These tags can never be defined in the scope of the declaration,
4880 so the types can never be completed,
4881 and no call can be compiled successfully. */
4883 /* In a fcn definition, arg types must be complete. */
4886 for (parm
= last_function_parms
, typelt
= first_parm
;
4888 parm
= TREE_CHAIN (parm
))
4889 /* Skip over any enumeration constants declared here. */
4890 if (TREE_CODE (parm
) == PARM_DECL
)
4892 /* Barf if the parameter itself has an incomplete type. */
4893 tree type
= TREE_VALUE (typelt
);
4894 if (!COMPLETE_TYPE_P (type
))
4896 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4897 error ("parameter `%s' has incomplete type",
4898 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4900 warning ("parameter has incomplete type");
4903 TREE_VALUE (typelt
) = error_mark_node
;
4904 TREE_TYPE (parm
) = error_mark_node
;
4907 #if 0 /* This has been replaced by parm_tags_warning
4908 which uses a more accurate criterion for what to warn about. */
4911 /* Now warn if is a pointer to an incomplete type. */
4912 while (TREE_CODE (type
) == POINTER_TYPE
4913 || TREE_CODE (type
) == REFERENCE_TYPE
)
4914 type
= TREE_TYPE (type
);
4915 type
= TYPE_MAIN_VARIANT (type
);
4916 if (!COMPLETE_TYPE_P (type
))
4918 if (DECL_NAME (parm
) != 0)
4919 warning ("parameter `%s' points to incomplete type",
4920 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4922 warning ("parameter points to incomplete type");
4926 typelt
= TREE_CHAIN (typelt
);
4934 /* Return a tree_list node with info on a parameter list just parsed.
4935 The TREE_PURPOSE is a chain of decls of those parms.
4936 The TREE_VALUE is a list of structure, union and enum tags defined.
4937 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4938 This tree_list node is later fed to `grokparms'.
4940 VOID_AT_END nonzero means append `void' to the end of the type-list.
4941 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4944 get_parm_info (void_at_end
)
4947 register tree decl
, t
;
4948 register tree types
= 0;
4950 tree tags
= gettags ();
4951 tree parms
= getdecls ();
4953 tree order
= current_binding_level
->parm_order
;
4955 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4956 if (void_at_end
&& parms
!= 0
4957 && TREE_CHAIN (parms
) == 0
4958 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
4959 && DECL_NAME (parms
) == 0)
4962 storedecls (NULL_TREE
);
4963 return tree_cons (NULL_TREE
, NULL_TREE
,
4964 tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
4967 /* Extract enumerator values and other non-parms declared with the parms.
4968 Likewise any forward parm decls that didn't have real parm decls. */
4969 for (decl
= parms
; decl
; )
4971 tree next
= TREE_CHAIN (decl
);
4973 if (TREE_CODE (decl
) != PARM_DECL
)
4975 TREE_CHAIN (decl
) = new_parms
;
4978 else if (TREE_ASM_WRITTEN (decl
))
4980 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
4981 TREE_CHAIN (decl
) = new_parms
;
4987 /* Put the parm decls back in the order they were in in the parm list. */
4988 for (t
= order
; t
; t
= TREE_CHAIN (t
))
4991 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
4993 TREE_CHAIN (TREE_VALUE (t
)) = 0;
4996 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
4999 /* Store the parmlist in the binding level since the old one
5000 is no longer a valid list. (We have changed the chain pointers.) */
5001 storedecls (new_parms
);
5003 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5004 /* There may also be declarations for enumerators if an enumeration
5005 type is declared among the parms. Ignore them here. */
5006 if (TREE_CODE (decl
) == PARM_DECL
)
5008 /* Since there is a prototype,
5009 args are passed in their declared types. */
5010 tree type
= TREE_TYPE (decl
);
5011 DECL_ARG_TYPE (decl
) = type
;
5012 if (PROMOTE_PROTOTYPES
5013 && (TREE_CODE (type
) == INTEGER_TYPE
5014 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5015 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5016 DECL_ARG_TYPE (decl
) = integer_type_node
;
5018 types
= tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5019 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5020 && DECL_NAME (decl
) == 0)
5022 error ("`void' in parameter list must be the entire list");
5028 return tree_cons (new_parms
, tags
,
5029 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
5031 return tree_cons (new_parms
, tags
, nreverse (types
));
5034 /* At end of parameter list, warn about any struct, union or enum tags
5035 defined within. Do so because these types cannot ever become complete. */
5038 parmlist_tags_warning ()
5043 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5045 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5046 /* An anonymous union parm type is meaningful as a GNU extension.
5047 So don't warn for that. */
5048 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5050 if (TREE_PURPOSE (elt
) != 0)
5051 warning ("`%s %s' declared inside parameter list",
5052 (code
== RECORD_TYPE
? "struct"
5053 : code
== UNION_TYPE
? "union"
5055 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5057 warning ("anonymous %s declared inside parameter list",
5058 (code
== RECORD_TYPE
? "struct"
5059 : code
== UNION_TYPE
? "union"
5064 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5070 /* Get the struct, enum or union (CODE says which) with tag NAME.
5071 Define the tag as a forward-reference if it is not defined. */
5074 xref_tag (code
, name
)
5075 enum tree_code code
;
5078 /* If a cross reference is requested, look up the type
5079 already defined for this tag and return it. */
5081 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5082 /* Even if this is the wrong type of tag, return what we found.
5083 There will be an error message anyway, from pending_xref_error.
5084 If we create an empty xref just for an invalid use of the type,
5085 the main result is to create lots of superfluous error messages. */
5089 /* If no such tag is yet defined, create a forward-reference node
5090 and record it as the "definition".
5091 When a real declaration of this type is found,
5092 the forward-reference will be altered into a real type. */
5094 ref
= make_node (code
);
5095 if (code
== ENUMERAL_TYPE
)
5097 /* (In ANSI, Enums can be referred to only if already defined.) */
5099 pedwarn ("ANSI C forbids forward references to `enum' types");
5100 /* Give the type a default layout like unsigned int
5101 to avoid crashing if it does not get defined. */
5102 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5103 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5104 TREE_UNSIGNED (ref
) = 1;
5105 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5106 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5107 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5110 pushtag (name
, ref
);
5115 /* Make sure that the tag NAME is defined *in the current binding level*
5116 at least as a forward reference.
5117 CODE says which kind of tag NAME ought to be. */
5120 start_struct (code
, name
)
5121 enum tree_code code
;
5124 /* If there is already a tag defined at this binding level
5125 (as a forward reference), just return it. */
5127 register tree ref
= 0;
5130 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5131 if (ref
&& TREE_CODE (ref
) == code
)
5133 C_TYPE_BEING_DEFINED (ref
) = 1;
5134 TYPE_PACKED (ref
) = flag_pack_struct
;
5135 if (TYPE_FIELDS (ref
))
5136 error ("redefinition of `%s %s'",
5137 code
== UNION_TYPE
? "union" : "struct",
5138 IDENTIFIER_POINTER (name
));
5143 /* Otherwise create a forward-reference just so the tag is in scope. */
5145 ref
= make_node (code
);
5146 pushtag (name
, ref
);
5147 C_TYPE_BEING_DEFINED (ref
) = 1;
5148 TYPE_PACKED (ref
) = flag_pack_struct
;
5152 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5153 of a structure component, returning a FIELD_DECL node.
5154 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5156 This is done during the parsing of the struct declaration.
5157 The FIELD_DECL nodes are chained together and the lot of them
5158 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5161 grokfield (filename
, line
, declarator
, declspecs
, width
)
5162 const char *filename ATTRIBUTE_UNUSED
;
5163 int line ATTRIBUTE_UNUSED
;
5164 tree declarator
, declspecs
, width
;
5168 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5170 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5171 DECL_INITIAL (value
) = width
;
5173 maybe_objc_check_decl (value
);
5177 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5178 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5179 ATTRIBUTES are attributes to be applied to the structure. */
5182 finish_struct (t
, fieldlist
, attributes
)
5188 int toplevel
= global_binding_level
== current_binding_level
;
5190 /* If this type was previously laid out as a forward reference,
5191 make sure we lay it out again. */
5195 decl_attributes (t
, attributes
, NULL_TREE
);
5197 /* Nameless union parm types are useful as GCC extension. */
5198 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5199 /* Otherwise, warn about any struct or union def. in parmlist. */
5200 if (in_parm_level_p ())
5203 pedwarn ("%s defined inside parms",
5204 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5205 else if (! flag_traditional
)
5206 warning ("%s defined inside parms",
5207 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5212 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5213 if (DECL_NAME (x
) != 0)
5217 pedwarn ("%s has no %smembers",
5218 TREE_CODE (t
) == UNION_TYPE
? "union" : "struct",
5219 fieldlist
? "named " : "");
5222 /* Install struct as DECL_CONTEXT of each field decl.
5223 Also process specified field sizes,m which is found in the DECL_INITIAL.
5224 Store 0 there, except for ": 0" fields (so we can find them
5225 and delete them, below). */
5227 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5229 DECL_CONTEXT (x
) = t
;
5230 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5232 /* If any field is const, the structure type is pseudo-const. */
5233 if (TREE_READONLY (x
))
5234 C_TYPE_FIELDS_READONLY (t
) = 1;
5237 /* A field that is pseudo-const makes the structure likewise. */
5238 tree t1
= TREE_TYPE (x
);
5239 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5240 t1
= TREE_TYPE (t1
);
5241 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5242 && C_TYPE_FIELDS_READONLY (t1
))
5243 C_TYPE_FIELDS_READONLY (t
) = 1;
5246 /* Any field that is volatile means variables of this type must be
5247 treated in some ways as volatile. */
5248 if (TREE_THIS_VOLATILE (x
))
5249 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5251 /* Any field of nominal variable size implies structure is too. */
5252 if (C_DECL_VARIABLE_SIZE (x
))
5253 C_TYPE_VARIABLE_SIZE (t
) = 1;
5255 /* Detect invalid nested redefinition. */
5256 if (TREE_TYPE (x
) == t
)
5257 error ("nested redefinition of `%s'",
5258 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5260 /* Detect invalid bit-field size. */
5261 if (DECL_INITIAL (x
))
5262 STRIP_NOPS (DECL_INITIAL (x
));
5263 if (DECL_INITIAL (x
))
5265 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5266 constant_expression_warning (DECL_INITIAL (x
));
5270 "bit-field `%s' width not an integer constant");
5271 DECL_INITIAL (x
) = NULL
;
5275 /* Detect invalid bit-field type. */
5276 if (DECL_INITIAL (x
)
5277 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5278 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5280 error_with_decl (x
, "bit-field `%s' has invalid type");
5281 DECL_INITIAL (x
) = NULL
;
5284 if (DECL_INITIAL (x
) && pedantic
5285 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5286 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5287 /* Accept an enum that's equivalent to int or unsigned int. */
5288 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5289 && (TYPE_PRECISION (TREE_TYPE (x
))
5290 == TYPE_PRECISION (integer_type_node
))))
5291 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5293 /* Detect and ignore out of range field width and process valid
5295 if (DECL_INITIAL (x
))
5297 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5298 error_with_decl (x
, "negative width in bit-field `%s'");
5299 else if (0 < compare_tree_int (DECL_INITIAL (x
),
5300 TYPE_PRECISION (TREE_TYPE (x
))))
5301 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5302 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5303 error_with_decl (x
, "zero width for bit-field `%s'");
5306 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5307 unsigned HOST_WIDE_INT width
5308 = TREE_INT_CST_LOW (DECL_INITIAL (x
));
5310 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5311 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5312 TREE_UNSIGNED (TREE_TYPE (x
)))
5314 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5315 TREE_UNSIGNED (TREE_TYPE (x
))))))
5316 warning_with_decl (x
,
5317 "`%s' is narrower than values of its type");
5319 DECL_SIZE (x
) = bitsize_int (width
);
5320 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5324 /* field size 0 => force desired amount of alignment. */
5325 #ifdef EMPTY_FIELD_BOUNDARY
5326 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5328 #ifdef PCC_BITFIELD_TYPE_MATTERS
5329 if (PCC_BITFIELD_TYPE_MATTERS
)
5330 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5331 TYPE_ALIGN (TREE_TYPE (x
)));
5337 else if (TREE_TYPE (x
) != error_mark_node
)
5339 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5340 : TYPE_ALIGN (TREE_TYPE (x
)));
5342 /* Non-bit-fields are aligned for their type, except packed
5343 fields which require only BITS_PER_UNIT alignment. */
5344 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5347 DECL_INITIAL (x
) = 0;
5350 /* Delete all duplicate fields from the fieldlist */
5351 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5352 /* Anonymous fields aren't duplicates. */
5353 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5357 register tree y
= fieldlist
;
5361 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5367 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5369 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5370 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5372 else x
= TREE_CHAIN (x
);
5375 /* Now we have the nearly final fieldlist. Record it,
5376 then lay out the structure or union (including the fields). */
5378 TYPE_FIELDS (t
) = fieldlist
;
5382 /* Delete all zero-width bit-fields from the fieldlist */
5384 tree
*fieldlistp
= &fieldlist
;
5386 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5387 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5389 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5392 /* Now we have the truly final field list.
5393 Store it in this type and in the variants. */
5395 TYPE_FIELDS (t
) = fieldlist
;
5397 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5399 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5400 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5401 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5404 /* If this was supposed to be a transparent union, but we can't
5405 make it one, warn and turn off the flag. */
5406 if (TREE_CODE (t
) == UNION_TYPE
5407 && TYPE_TRANSPARENT_UNION (t
)
5408 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5410 TYPE_TRANSPARENT_UNION (t
) = 0;
5411 warning ("union cannot be made transparent");
5414 /* If this structure or union completes the type of any previous
5415 variable declaration, lay it out and output its rtl. */
5417 if (current_binding_level
->n_incomplete
!= 0)
5420 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5422 if (TREE_TYPE (decl
) == t
5423 && TREE_CODE (decl
) != TYPE_DECL
)
5425 layout_decl (decl
, 0);
5426 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5427 maybe_objc_check_decl (decl
);
5428 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5431 --current_binding_level
->n_incomplete
;
5433 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5434 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5436 tree element
= TREE_TYPE (decl
);
5437 while (TREE_CODE (element
) == ARRAY_TYPE
)
5438 element
= TREE_TYPE (element
);
5440 layout_array_type (TREE_TYPE (decl
));
5445 /* Finish debugging output for this type. */
5446 rest_of_type_compilation (t
, toplevel
);
5451 /* Lay out the type T, and its element type, and so on. */
5454 layout_array_type (t
)
5457 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5458 layout_array_type (TREE_TYPE (t
));
5462 /* Begin compiling the definition of an enumeration type.
5463 NAME is its name (or null if anonymous).
5464 Returns the type object, as yet incomplete.
5465 Also records info about it so that build_enumerator
5466 may be used to declare the individual values as they are read. */
5472 register tree enumtype
= 0;
5474 /* If this is the real definition for a previous forward reference,
5475 fill in the contents in the same object that used to be the
5476 forward reference. */
5479 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5481 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5483 enumtype
= make_node (ENUMERAL_TYPE
);
5484 pushtag (name
, enumtype
);
5487 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5489 if (TYPE_VALUES (enumtype
) != 0)
5491 /* This enum is a named one that has been declared already. */
5492 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5494 /* Completely replace its old definition.
5495 The old enumerators remain defined, however. */
5496 TYPE_VALUES (enumtype
) = 0;
5499 enum_next_value
= integer_zero_node
;
5502 if (flag_short_enums
)
5503 TYPE_PACKED (enumtype
) = 1;
5508 /* After processing and defining all the values of an enumeration type,
5509 install their decls in the enumeration type and finish it off.
5510 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5511 and ATTRIBUTES are the specified attributes.
5512 Returns ENUMTYPE. */
5515 finish_enum (enumtype
, values
, attributes
)
5520 register tree pair
, tem
;
5521 tree minnode
= 0, maxnode
= 0;
5522 int precision
, unsign
;
5523 int toplevel
= (global_binding_level
== current_binding_level
);
5525 if (in_parm_level_p ())
5526 warning ("enum defined inside parms");
5528 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5530 /* Calculate the maximum value of any enumerator in this type. */
5532 if (values
== error_mark_node
)
5533 minnode
= maxnode
= integer_zero_node
;
5536 minnode
= maxnode
= TREE_VALUE (values
);
5537 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5539 tree value
= TREE_VALUE (pair
);
5540 if (tree_int_cst_lt (maxnode
, value
))
5542 if (tree_int_cst_lt (value
, minnode
))
5547 /* Construct the final type of this enumeration. It is the same
5548 as one of the integral types - the narrowest one that fits, except
5549 that normally we only go as narrow as int - and signed iff any of
5550 the values are negative. */
5551 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5552 precision
= MAX (min_precision (minnode
, unsign
),
5553 min_precision (maxnode
, unsign
));
5554 if (!TYPE_PACKED (enumtype
))
5555 precision
= MAX (precision
, TYPE_PRECISION (integer_type_node
));
5556 if (type_for_size (precision
, unsign
) == 0)
5558 warning ("enumeration values exceed range of largest integer");
5559 precision
= TYPE_PRECISION (long_long_integer_type_node
);
5562 TYPE_MIN_VALUE (enumtype
) = minnode
;
5563 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5564 TYPE_PRECISION (enumtype
) = precision
;
5565 TREE_UNSIGNED (enumtype
) = unsign
;
5566 TYPE_SIZE (enumtype
) = 0;
5567 layout_type (enumtype
);
5569 if (values
!= error_mark_node
)
5571 /* Change the type of the enumerators to be the enum type. We
5572 need to do this irrespective of the size of the enum, for
5573 proper type checking. Replace the DECL_INITIALs of the
5574 enumerators, and the value slots of the list, with copies
5575 that have the enum type; they cannot be modified in place
5576 because they may be shared (e.g. integer_zero_node) Finally,
5577 change the purpose slots to point to the names of the decls. */
5578 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5580 tree enu
= TREE_PURPOSE (pair
);
5582 TREE_TYPE (enu
) = enumtype
;
5583 DECL_SIZE (enu
) = TYPE_SIZE (enumtype
);
5584 DECL_SIZE_UNIT (enu
) = TYPE_SIZE_UNIT (enumtype
);
5585 DECL_ALIGN (enu
) = TYPE_ALIGN (enumtype
);
5586 DECL_MODE (enu
) = TYPE_MODE (enumtype
);
5587 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5589 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5590 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5593 TYPE_VALUES (enumtype
) = values
;
5596 /* Fix up all variant types of this enum type. */
5597 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5599 if (tem
== enumtype
)
5601 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5602 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5603 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5604 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5605 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5606 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5607 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5608 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5609 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5612 /* Finish debugging output for this type. */
5613 rest_of_type_compilation (enumtype
, toplevel
);
5618 /* Build and install a CONST_DECL for one value of the
5619 current enumeration type (one that was begun with start_enum).
5620 Return a tree-list containing the CONST_DECL and its value.
5621 Assignment of sequential values by default is handled here. */
5624 build_enumerator (name
, value
)
5627 register tree decl
, type
;
5629 /* Validate and default VALUE. */
5631 /* Remove no-op casts from the value. */
5633 STRIP_TYPE_NOPS (value
);
5637 if (TREE_CODE (value
) == INTEGER_CST
)
5639 value
= default_conversion (value
);
5640 constant_expression_warning (value
);
5644 error ("enumerator value for `%s' not integer constant",
5645 IDENTIFIER_POINTER (name
));
5650 /* Default based on previous value. */
5651 /* It should no longer be possible to have NON_LVALUE_EXPR
5655 value
= enum_next_value
;
5657 error ("overflow in enumeration values");
5660 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5662 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5663 value
= integer_zero_node
;
5666 /* Set basis for default for next value. */
5667 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5668 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5670 /* Now create a declaration for the enum value name. */
5672 type
= TREE_TYPE (value
);
5673 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5674 TYPE_PRECISION (integer_type_node
)),
5676 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5677 && TREE_UNSIGNED (type
)));
5679 decl
= build_decl (CONST_DECL
, name
, type
);
5680 DECL_INITIAL (decl
) = convert (type
, value
);
5683 return tree_cons (decl
, value
, NULL_TREE
);
5686 /* Create the FUNCTION_DECL for a function definition.
5687 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5688 the declaration; they describe the function's name and the type it returns,
5689 but twisted together in a fashion that parallels the syntax of C.
5691 This function creates a binding context for the function body
5692 as well as setting up the FUNCTION_DECL in current_function_decl.
5694 Returns 1 on success. If the DECLARATOR is not suitable for a function
5695 (it defines a datum instead), we return 0, which tells
5696 yyparse to report a parse error. */
5699 start_function (declspecs
, declarator
, prefix_attributes
, attributes
)
5700 tree declarator
, declspecs
, prefix_attributes
, attributes
;
5702 tree decl1
, old_decl
;
5704 int old_immediate_size_expand
= immediate_size_expand
;
5706 current_function_returns_value
= 0; /* Assume, until we see it does. */
5707 current_function_returns_null
= 0;
5708 warn_about_return_type
= 0;
5709 current_extern_inline
= 0;
5710 c_function_varargs
= 0;
5712 shadowed_labels
= 0;
5714 /* Don't expand any sizes in the return type of the function. */
5715 immediate_size_expand
= 0;
5717 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5719 /* If the declarator is not suitable for a function definition,
5720 cause a syntax error. */
5723 immediate_size_expand
= old_immediate_size_expand
;
5727 decl_attributes (decl1
, prefix_attributes
, attributes
);
5729 announce_function (decl1
);
5731 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5733 error ("return-type is an incomplete type");
5734 /* Make it return void instead. */
5736 = build_function_type (void_type_node
,
5737 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5740 if (warn_about_return_type
)
5741 warning ("return-type defaults to `int'");
5743 /* Save the parm names or decls from this function's declarator
5744 where store_parm_decls will find them. */
5745 current_function_parms
= last_function_parms
;
5746 current_function_parm_tags
= last_function_parm_tags
;
5748 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5749 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5750 DECL_INITIAL (decl1
) = error_mark_node
;
5752 /* If this definition isn't a prototype and we had a prototype declaration
5753 before, copy the arg type info from that prototype.
5754 But not if what we had before was a builtin function. */
5755 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5756 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5757 && !DECL_BUILT_IN (old_decl
)
5758 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5759 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5760 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5762 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5763 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
5764 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
5767 /* If there is no explicit declaration, look for any out-of-scope implicit
5770 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
5772 /* Optionally warn of old-fashioned def with no previous prototype. */
5773 if (warn_strict_prototypes
5774 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5775 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5776 warning ("function declaration isn't a prototype");
5777 /* Optionally warn of any global def with no previous prototype. */
5778 else if (warn_missing_prototypes
5779 && TREE_PUBLIC (decl1
)
5780 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
5781 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5782 warning_with_decl (decl1
, "no previous prototype for `%s'");
5783 /* Optionally warn of any def with no previous prototype
5784 if the function has already been used. */
5785 else if (warn_missing_prototypes
5786 && old_decl
!= 0 && TREE_USED (old_decl
)
5787 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5788 warning_with_decl (decl1
,
5789 "`%s' was used with no prototype before its definition");
5790 /* Optionally warn of any global def with no previous declaration. */
5791 else if (warn_missing_declarations
5792 && TREE_PUBLIC (decl1
)
5794 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5795 warning_with_decl (decl1
, "no previous declaration for `%s'");
5796 /* Optionally warn of any def with no previous declaration
5797 if the function has already been used. */
5798 else if (warn_missing_declarations
5799 && old_decl
!= 0 && TREE_USED (old_decl
)
5800 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
5801 warning_with_decl (decl1
,
5802 "`%s' was used with no declaration before its definition");
5804 /* This is a definition, not a reference.
5805 So normally clear DECL_EXTERNAL.
5806 However, `extern inline' acts like a declaration
5807 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5808 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5810 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5811 SET_DEFAULT_DECL_ATTRIBUTES (decl1
, attributes
);
5814 /* This function exists in static storage.
5815 (This does not mean `static' in the C sense!) */
5816 TREE_STATIC (decl1
) = 1;
5818 /* A nested function is not global. */
5819 if (current_function_decl
!= 0)
5820 TREE_PUBLIC (decl1
) = 0;
5822 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5824 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
5829 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5830 != integer_type_node
)
5831 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
5833 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5834 args
= TREE_CHAIN (args
))
5836 tree type
= args
? TREE_VALUE (args
) : 0;
5838 if (type
== void_type_node
)
5845 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5846 pedwarn_with_decl (decl1
,
5847 "first argument of `%s' should be `int'");
5851 if (TREE_CODE (type
) != POINTER_TYPE
5852 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5853 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5855 pedwarn_with_decl (decl1
,
5856 "second argument of `%s' should be `char **'");
5860 if (TREE_CODE (type
) != POINTER_TYPE
5861 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5862 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5864 pedwarn_with_decl (decl1
,
5865 "third argument of `%s' should probably be `char **'");
5870 /* It is intentional that this message does not mention the third
5871 argument, which is warned for only pedantically, because it's
5872 blessed by mention in an appendix of the standard. */
5873 if (argct
> 0 && (argct
< 2 || argct
> 3))
5874 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
5876 if (argct
== 3 && pedantic
)
5877 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
5879 if (! TREE_PUBLIC (decl1
))
5880 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
5883 /* Record the decl so that the function name is defined.
5884 If we already have a decl for this name, and it is a FUNCTION_DECL,
5885 use the old decl. */
5887 current_function_decl
= pushdecl (decl1
);
5890 declare_parm_level (1);
5891 current_binding_level
->subblocks_tag_transparent
= 1;
5893 make_function_rtl (current_function_decl
);
5895 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5896 /* Promote the value to int before returning it. */
5897 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
5899 /* It retains unsignedness if traditional
5900 or if not really getting wider. */
5901 if (TREE_UNSIGNED (restype
)
5902 && (flag_traditional
5903 || (TYPE_PRECISION (restype
)
5904 == TYPE_PRECISION (integer_type_node
))))
5905 restype
= unsigned_type_node
;
5907 restype
= integer_type_node
;
5909 DECL_RESULT (current_function_decl
)
5910 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5912 /* If this fcn was already referenced via a block-scope `extern' decl
5913 (or an implicit decl), propagate certain information about the usage. */
5914 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5915 TREE_ADDRESSABLE (current_function_decl
) = 1;
5917 immediate_size_expand
= old_immediate_size_expand
;
5922 /* Record that this function is going to be a varargs function.
5923 This is called before store_parm_decls, which is too early
5924 to call mark_varargs directly. */
5929 c_function_varargs
= 1;
5932 /* Store the parameter declarations into the current function declaration.
5933 This is called after parsing the parameter declarations, before
5934 digesting the body of the function.
5936 For an old-style definition, modify the function's type
5937 to specify at least the number of arguments. */
5942 register tree fndecl
= current_function_decl
;
5945 /* This is either a chain of PARM_DECLs (if a prototype was used)
5946 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5947 tree specparms
= current_function_parms
;
5949 /* This is a list of types declared among parms in a prototype. */
5950 tree parmtags
= current_function_parm_tags
;
5952 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5953 register tree parmdecls
= getdecls ();
5955 /* This is a chain of any other decls that came in among the parm
5956 declarations. If a parm is declared with enum {foo, bar} x;
5957 then CONST_DECLs for foo and bar are put here. */
5960 /* Nonzero if this definition is written with a prototype. */
5963 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
5965 /* This case is when the function was defined with an ANSI prototype.
5966 The parms already have decls, so we need not do anything here
5967 except record them as in effect
5968 and complain if any redundant old-style parm decls were written. */
5979 error_with_decl (fndecl
,
5980 "parm types given both in parmlist and separately");
5981 /* Get rid of the erroneous decls; don't keep them on
5982 the list of parms, since they might not be PARM_DECLs. */
5983 for (decl
= current_binding_level
->names
;
5984 decl
; decl
= TREE_CHAIN (decl
))
5985 if (DECL_NAME (decl
))
5986 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
5987 for (link
= current_binding_level
->shadowed
;
5988 link
; link
= TREE_CHAIN (link
))
5989 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
5990 current_binding_level
->names
= 0;
5991 current_binding_level
->shadowed
= 0;
5994 specparms
= nreverse (specparms
);
5995 for (parm
= specparms
; parm
; parm
= next
)
5997 next
= TREE_CHAIN (parm
);
5998 if (TREE_CODE (parm
) == PARM_DECL
)
6000 if (DECL_NAME (parm
) == 0)
6001 error_with_decl (parm
, "parameter name omitted");
6002 else if (TREE_CODE (TREE_TYPE (parm
)) != ERROR_MARK
6003 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6006 error_with_decl (parm
, "parameter `%s' declared void");
6007 /* Change the type to error_mark_node so this parameter
6008 will be ignored by assign_parms. */
6009 TREE_TYPE (parm
) = error_mark_node
;
6015 /* If we find an enum constant or a type tag,
6016 put it aside for the moment. */
6017 TREE_CHAIN (parm
) = 0;
6018 others
= chainon (others
, parm
);
6022 /* Get the decls in their original chain order
6023 and record in the function. */
6024 DECL_ARGUMENTS (fndecl
) = getdecls ();
6027 /* If this function takes a variable number of arguments,
6028 add a phony parameter to the end of the parm list,
6029 to represent the position of the first unnamed argument. */
6030 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6033 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6034 /* Let's hope the address of the unnamed parm
6035 won't depend on its type. */
6036 TREE_TYPE (dummy
) = integer_type_node
;
6037 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6038 DECL_ARGUMENTS (fndecl
)
6039 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6043 /* Now pushdecl the enum constants. */
6044 for (parm
= others
; parm
; parm
= next
)
6046 next
= TREE_CHAIN (parm
);
6047 if (DECL_NAME (parm
) == 0)
6049 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6051 else if (TREE_CODE (parm
) != PARM_DECL
)
6055 storetags (chainon (parmtags
, gettags ()));
6059 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6060 each with a parm name as the TREE_VALUE.
6062 PARMDECLS is a chain of declarations for parameters.
6063 Warning! It can also contain CONST_DECLs which are not parameters
6064 but are names of enumerators of any enum types
6065 declared among the parameters.
6067 First match each formal parameter name with its declaration.
6068 Associate decls with the names and store the decls
6069 into the TREE_PURPOSE slots. */
6071 /* We use DECL_WEAK as a flag to show which parameters have been
6072 seen already since it is not used on PARM_DECL or CONST_DECL. */
6073 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6074 DECL_WEAK (parm
) = 0;
6076 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6078 register tree tail
, found
= NULL
;
6080 if (TREE_VALUE (parm
) == 0)
6082 error_with_decl (fndecl
,
6083 "parameter name missing from parameter list");
6084 TREE_PURPOSE (parm
) = 0;
6088 /* See if any of the parmdecls specifies this parm by name.
6089 Ignore any enumerator decls. */
6090 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6091 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6092 && TREE_CODE (tail
) == PARM_DECL
)
6098 /* If declaration already marked, we have a duplicate name.
6099 Complain, and don't use this decl twice. */
6100 if (found
&& DECL_WEAK (found
))
6102 error_with_decl (found
, "multiple parameters named `%s'");
6106 /* If the declaration says "void", complain and ignore it. */
6107 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6109 error_with_decl (found
, "parameter `%s' declared void");
6110 TREE_TYPE (found
) = integer_type_node
;
6111 DECL_ARG_TYPE (found
) = integer_type_node
;
6112 layout_decl (found
, 0);
6115 /* Traditionally, a parm declared float is actually a double. */
6116 if (found
&& flag_traditional
6117 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6119 TREE_TYPE (found
) = double_type_node
;
6120 DECL_ARG_TYPE (found
) = double_type_node
;
6121 layout_decl (found
, 0);
6124 /* If no declaration found, default to int. */
6127 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6129 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6130 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6131 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6133 warning_with_decl (found
, "type of `%s' defaults to `int'");
6137 TREE_PURPOSE (parm
) = found
;
6139 /* Mark this decl as "already found" */
6140 DECL_WEAK (found
) = 1;
6143 /* Put anything which is on the parmdecls chain and which is
6144 not a PARM_DECL onto the list NONPARMS. (The types of
6145 non-parm things which might appear on the list include
6146 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6147 any actual PARM_DECLs not matched with any names. */
6150 for (parm
= parmdecls
; parm
; )
6152 tree next
= TREE_CHAIN (parm
);
6153 TREE_CHAIN (parm
) = 0;
6155 if (TREE_CODE (parm
) != PARM_DECL
)
6156 nonparms
= chainon (nonparms
, parm
);
6159 /* Complain about args with incomplete types. */
6160 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6162 error_with_decl (parm
, "parameter `%s' has incomplete type");
6163 TREE_TYPE (parm
) = error_mark_node
;
6166 if (! DECL_WEAK (parm
))
6168 error_with_decl (parm
,
6169 "declaration for parameter `%s' but no such parameter");
6170 /* Pretend the parameter was not missing.
6171 This gets us to a standard state and minimizes
6172 further error messages. */
6174 = chainon (specparms
,
6175 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6182 /* Chain the declarations together in the order of the list of names. */
6183 /* Store that chain in the function decl, replacing the list of names. */
6185 DECL_ARGUMENTS (fndecl
) = 0;
6188 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6189 if (TREE_PURPOSE (parm
))
6192 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6194 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6195 last
= TREE_PURPOSE (parm
);
6196 TREE_CHAIN (last
) = 0;
6200 /* If there was a previous prototype,
6201 set the DECL_ARG_TYPE of each argument according to
6202 the type previously specified, and report any mismatches. */
6204 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6207 for (parm
= DECL_ARGUMENTS (fndecl
),
6208 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6209 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6210 != void_type_node
));
6211 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6213 if (parm
== 0 || type
== 0
6214 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6216 error ("number of arguments doesn't match prototype");
6217 error_with_file_and_line (current_function_prototype_file
,
6218 current_function_prototype_line
,
6219 "prototype declaration");
6222 /* Type for passing arg must be consistent
6223 with that declared for the arg. */
6224 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6226 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6227 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6229 /* Adjust argument to match prototype. E.g. a previous
6230 `int foo(float);' prototype causes
6231 `int foo(x) float x; {...}' to be treated like
6232 `int foo(float x) {...}'. This is particularly
6233 useful for argument types like uid_t. */
6234 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6236 if (PROMOTE_PROTOTYPES
6237 && (TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6238 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6239 && TYPE_PRECISION (TREE_TYPE (parm
))
6240 < TYPE_PRECISION (integer_type_node
))
6241 DECL_ARG_TYPE (parm
) = integer_type_node
;
6245 pedwarn ("promoted argument `%s' doesn't match prototype",
6246 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6247 warning_with_file_and_line
6248 (current_function_prototype_file
,
6249 current_function_prototype_line
,
6250 "prototype declaration");
6253 /* If -traditional, allow `int' argument to match
6254 `unsigned' prototype. */
6255 else if (! (flag_traditional
6256 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6257 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6259 error ("argument `%s' doesn't match prototype",
6260 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6261 error_with_file_and_line (current_function_prototype_file
,
6262 current_function_prototype_line
,
6263 "prototype declaration");
6267 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6270 /* Otherwise, create a prototype that would match. */
6274 tree actual
= 0, last
= 0, type
;
6276 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6278 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6280 TREE_CHAIN (last
) = type
;
6285 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6287 TREE_CHAIN (last
) = type
;
6291 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6292 of the type of this function, but we need to avoid having this
6293 affect the types of other similarly-typed functions, so we must
6294 first force the generation of an identical (but separate) type
6295 node for the relevant function type. The new node we create
6296 will be a variant of the main variant of the original function
6299 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6301 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6304 /* Now store the final chain of decls for the arguments
6305 as the decl-chain of the current lexical scope.
6306 Put the enumerators in as well, at the front so that
6307 DECL_ARGUMENTS is not modified. */
6309 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6312 /* Make sure the binding level for the top of the function body
6313 gets a BLOCK if there are any in the function.
6314 Otherwise, the dbx output is wrong. */
6316 keep_next_if_subblocks
= 1;
6318 /* ??? This might be an improvement,
6319 but needs to be thought about some more. */
6321 keep_next_level_flag
= 1;
6324 /* Write a record describing this function definition to the prototypes
6325 file (if requested). */
6327 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6329 /* Initialize the RTL code for the function. */
6331 init_function_start (fndecl
, input_filename
, lineno
);
6333 /* If this is a varargs function, inform function.c. */
6335 if (c_function_varargs
)
6338 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6340 declare_function_name ();
6342 /* Set up parameters and prepare for return, for the function. */
6344 expand_function_start (fndecl
, 0);
6346 /* If this function is `main', emit a call to `__main'
6347 to run global initializers, etc. */
6348 if (DECL_NAME (fndecl
)
6349 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6350 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6351 expand_main_function ();
6354 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6355 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6356 stands for an ellipsis in the identifier list.
6358 PARMLIST is the data returned by get_parm_info for the
6359 parmlist that follows the semicolon.
6361 We return a value of the same sort that get_parm_info returns,
6362 except that it describes the combination of identifiers and parmlist. */
6365 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6366 tree specparms
, parmlist
;
6369 register tree fndecl
= current_function_decl
;
6372 tree parmdecls
= TREE_PURPOSE (parmlist
);
6374 /* This is a chain of any other decls that came in among the parm
6375 declarations. They were separated already by get_parm_info,
6376 so we just need to keep them separate. */
6377 tree nonparms
= TREE_VALUE (parmlist
);
6381 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6382 DECL_WEAK (parm
) = 0;
6384 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6386 register tree tail
, found
= NULL
;
6388 /* See if any of the parmdecls specifies this parm by name. */
6389 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6390 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6396 /* If declaration already marked, we have a duplicate name.
6397 Complain, and don't use this decl twice. */
6398 if (found
&& DECL_WEAK (found
))
6400 error_with_decl (found
, "multiple parameters named `%s'");
6404 /* If the declaration says "void", complain and ignore it. */
6405 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6407 error_with_decl (found
, "parameter `%s' declared void");
6408 TREE_TYPE (found
) = integer_type_node
;
6409 DECL_ARG_TYPE (found
) = integer_type_node
;
6410 layout_decl (found
, 0);
6413 /* Traditionally, a parm declared float is actually a double. */
6414 if (found
&& flag_traditional
6415 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6417 TREE_TYPE (found
) = double_type_node
;
6418 DECL_ARG_TYPE (found
) = double_type_node
;
6419 layout_decl (found
, 0);
6422 /* If no declaration found, default to int. */
6425 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6427 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6428 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6429 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6430 error_with_decl (found
, "type of parameter `%s' is not declared");
6434 TREE_PURPOSE (parm
) = found
;
6436 /* Mark this decl as "already found". */
6437 DECL_WEAK (found
) = 1;
6440 /* Complain about any actual PARM_DECLs not matched with any names. */
6442 for (parm
= parmdecls
; parm
; )
6444 tree next
= TREE_CHAIN (parm
);
6445 TREE_CHAIN (parm
) = 0;
6447 /* Complain about args with incomplete types. */
6448 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6450 error_with_decl (parm
, "parameter `%s' has incomplete type");
6451 TREE_TYPE (parm
) = error_mark_node
;
6454 if (! DECL_WEAK (parm
))
6456 error_with_decl (parm
,
6457 "declaration for parameter `%s' but no such parameter");
6458 /* Pretend the parameter was not missing.
6459 This gets us to a standard state and minimizes
6460 further error messages. */
6462 = chainon (specparms
,
6463 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6469 /* Chain the declarations together in the order of the list of names.
6470 At the same time, build up a list of their types, in reverse order. */
6476 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6477 if (TREE_PURPOSE (parm
))
6480 parmdecls
= TREE_PURPOSE (parm
);
6482 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6483 last
= TREE_PURPOSE (parm
);
6484 TREE_CHAIN (last
) = 0;
6486 types
= tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6491 return tree_cons (parmdecls
, nonparms
,
6492 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
6494 return tree_cons (parmdecls
, nonparms
, nreverse (types
));
6497 /* Finish up a function declaration and compile that function
6498 all the way to assembler language output. The free the storage
6499 for the function definition.
6501 This is called after parsing the body of the function definition.
6503 NESTED is nonzero if the function being finished is nested in another. */
6506 finish_function (nested
)
6509 register tree fndecl
= current_function_decl
;
6511 /* TREE_READONLY (fndecl) = 1;
6512 This caused &foo to be of type ptr-to-const-function
6513 which then got a warning when stored in a ptr-to-function variable. */
6516 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6518 /* Must mark the RESULT_DECL as being in this function. */
6520 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6522 /* Obey `register' declarations if `setjmp' is called in this fn. */
6523 if (flag_traditional
&& current_function_calls_setjmp
)
6525 setjmp_protect (DECL_INITIAL (fndecl
));
6526 setjmp_protect_args ();
6529 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6531 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6532 != integer_type_node
)
6534 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6535 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6537 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6541 #ifdef DEFAULT_MAIN_RETURN
6542 /* Make it so that `main' always returns success by default. */
6543 DEFAULT_MAIN_RETURN
;
6548 /* Generate rtl for function exit. */
6549 expand_function_end (input_filename
, lineno
, 0);
6551 /* So we can tell if jump_optimize sets it to 1. */
6554 /* If this is a nested function, protect the local variables in the stack
6555 above us from being collected while we're compiling this function. */
6557 ggc_push_context ();
6559 /* Run the optimizers and output the assembler code for this function. */
6560 rest_of_compilation (fndecl
);
6562 /* Undo the GC context switch. */
6566 current_function_returns_null
|= can_reach_end
;
6568 if (warn_missing_noreturn
6569 && !TREE_THIS_VOLATILE (fndecl
)
6570 && !current_function_returns_null
6571 && !current_function_returns_value
)
6572 warning ("function might be possible candidate for attribute `noreturn'");
6574 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6575 warning ("`noreturn' function does return");
6576 else if (warn_return_type
&& can_reach_end
6577 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
6578 /* If this function returns non-void and control can drop through,
6580 warning ("control reaches end of non-void function");
6581 /* With just -W, complain only if function returns both with
6582 and without a value. */
6583 else if (extra_warnings
6584 && current_function_returns_value
&& current_function_returns_null
)
6585 warning ("this function may return with or without a value");
6587 /* If requested, warn about function definitions where the function will
6588 return a value (usually of some struct or union type) which itself will
6589 take up a lot of stack space. */
6591 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6593 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6595 if (ret_type
&& TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
6596 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
6599 unsigned int size_as_int
6600 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
6602 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
6603 warning_with_decl (fndecl
,
6604 "size of return value of `%s' is %u bytes",
6607 warning_with_decl (fndecl
,
6608 "size of return value of `%s' is larger than %d bytes",
6613 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6615 /* Stop pointing to the local nodes about to be freed.
6616 But DECL_INITIAL must remain nonzero so we know this
6617 was an actual function definition.
6618 For a nested function, this is done in pop_c_function_context.
6619 If rest_of_compilation set this to 0, leave it 0. */
6620 if (DECL_INITIAL (fndecl
) != 0)
6621 DECL_INITIAL (fndecl
) = error_mark_node
;
6623 DECL_ARGUMENTS (fndecl
) = 0;
6626 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6628 #ifndef ASM_OUTPUT_CONSTRUCTOR
6629 if (! flag_gnu_linker
)
6630 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6633 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6636 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6638 #ifndef ASM_OUTPUT_DESTRUCTOR
6639 if (! flag_gnu_linker
)
6640 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6643 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6648 /* Let the error reporting routines know that we're outside a
6649 function. For a nested function, this value is used in
6650 pop_c_function_context and then reset via pop_function_context. */
6651 current_function_decl
= NULL
;
6655 /* Save and restore the variables in this file and elsewhere
6656 that keep track of the progress of compilation of the current function.
6657 Used for nested functions. */
6659 struct language_function
6662 tree shadowed_labels
;
6665 int warn_about_return_type
;
6667 struct binding_level
*binding_level
;
6670 /* Save and reinitialize the variables
6671 used during compilation of a C function. */
6674 push_c_function_context (f
)
6677 struct language_function
*p
;
6678 p
= (struct language_function
*) xmalloc (sizeof (struct language_function
));
6681 p
->named_labels
= named_labels
;
6682 p
->shadowed_labels
= shadowed_labels
;
6683 p
->returns_value
= current_function_returns_value
;
6684 p
->returns_null
= current_function_returns_null
;
6685 p
->warn_about_return_type
= warn_about_return_type
;
6686 p
->extern_inline
= current_extern_inline
;
6687 p
->binding_level
= current_binding_level
;
6690 /* Restore the variables used during compilation of a C function. */
6693 pop_c_function_context (f
)
6696 struct language_function
*p
= f
->language
;
6699 /* Bring back all the labels that were shadowed. */
6700 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
6701 if (DECL_NAME (TREE_VALUE (link
)) != 0)
6702 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
6703 = TREE_VALUE (link
);
6705 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
6707 /* Stop pointing to the local nodes about to be freed. */
6708 /* But DECL_INITIAL must remain nonzero so we know this
6709 was an actual function definition. */
6710 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6711 DECL_ARGUMENTS (current_function_decl
) = 0;
6714 named_labels
= p
->named_labels
;
6715 shadowed_labels
= p
->shadowed_labels
;
6716 current_function_returns_value
= p
->returns_value
;
6717 current_function_returns_null
= p
->returns_null
;
6718 warn_about_return_type
= p
->warn_about_return_type
;
6719 current_extern_inline
= p
->extern_inline
;
6720 current_binding_level
= p
->binding_level
;
6726 /* Mark the language specific parts of F for GC. */
6728 mark_c_function_context (f
)
6731 struct language_function
*p
= f
->language
;
6736 ggc_mark_tree (p
->shadowed_labels
);
6737 ggc_mark_tree (p
->named_labels
);
6738 mark_binding_level (&p
->binding_level
);
6741 /* integrate_decl_tree calls this function, but since we don't use the
6742 DECL_LANG_SPECIFIC field, this is a no-op. */
6745 copy_lang_decl (node
)
6746 tree node ATTRIBUTE_UNUSED
;
6750 /* Mark ARG for GC. */
6752 lang_mark_false_label_stack (arg
)
6753 struct label_node
*arg
;
6755 /* C doesn't use false_label_stack. It better be NULL. */
6760 /* Mark the language specific bits in T for GC. */
6765 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
6767 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
6768 ggc_mark_tree (i
->global_value
);
6769 ggc_mark_tree (i
->local_value
);
6770 ggc_mark_tree (i
->label_value
);
6771 ggc_mark_tree (i
->implicit_decl
);
6772 ggc_mark_tree (i
->error_locus
);
6773 ggc_mark_tree (i
->limbo_value
);
6775 else if (TYPE_P (t
) && TYPE_LANG_SPECIFIC (t
))
6776 ggc_mark (TYPE_LANG_SPECIFIC (t
));