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 void_list_node
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3028 default_function_type
3029 = build_function_type (integer_type_node
, NULL_TREE
);
3031 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
3033 c_common_nodes_and_builtins (0, flag_no_builtin
, flag_no_nonansi_builtin
);
3035 endlink
= void_list_node
;
3036 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3038 = build_function_type (ptr_type_node
,
3039 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3041 /* Types which are common to the fortran compiler and libf2c. When
3042 changing these, you also need to be concerned with f/com.h. */
3044 if (TYPE_PRECISION (float_type_node
)
3045 == TYPE_PRECISION (long_integer_type_node
))
3047 g77_integer_type_node
= long_integer_type_node
;
3048 g77_uinteger_type_node
= long_unsigned_type_node
;
3050 else if (TYPE_PRECISION (float_type_node
)
3051 == TYPE_PRECISION (integer_type_node
))
3053 g77_integer_type_node
= integer_type_node
;
3054 g77_uinteger_type_node
= unsigned_type_node
;
3057 g77_integer_type_node
= g77_uinteger_type_node
= NULL_TREE
;
3059 if (g77_integer_type_node
!= NULL_TREE
)
3061 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_integer"),
3062 g77_integer_type_node
));
3063 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_uinteger"),
3064 g77_uinteger_type_node
));
3067 if (TYPE_PRECISION (float_type_node
) * 2
3068 == TYPE_PRECISION (long_integer_type_node
))
3070 g77_longint_type_node
= long_integer_type_node
;
3071 g77_ulongint_type_node
= long_unsigned_type_node
;
3073 else if (TYPE_PRECISION (float_type_node
) * 2
3074 == TYPE_PRECISION (long_long_integer_type_node
))
3076 g77_longint_type_node
= long_long_integer_type_node
;
3077 g77_ulongint_type_node
= long_long_unsigned_type_node
;
3080 g77_longint_type_node
= g77_ulongint_type_node
= NULL_TREE
;
3082 if (g77_longint_type_node
!= NULL_TREE
)
3084 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_longint"),
3085 g77_longint_type_node
));
3086 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_ulongint"),
3087 g77_ulongint_type_node
));
3090 builtin_function ("__builtin_aggregate_incoming_address",
3091 build_function_type (ptr_type_node
, NULL_TREE
),
3092 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
,
3093 BUILT_IN_NORMAL
, NULL_PTR
);
3095 /* Hooks for the DWARF 2 __throw routine. */
3096 builtin_function ("__builtin_unwind_init",
3097 build_function_type (void_type_node
, endlink
),
3098 BUILT_IN_UNWIND_INIT
, BUILT_IN_NORMAL
, NULL_PTR
);
3099 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void
,
3100 BUILT_IN_DWARF_CFA
, BUILT_IN_NORMAL
, NULL_PTR
);
3101 builtin_function ("__builtin_dwarf_fp_regnum",
3102 build_function_type (unsigned_type_node
, endlink
),
3103 BUILT_IN_DWARF_FP_REGNUM
, BUILT_IN_NORMAL
, NULL_PTR
);
3104 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr
,
3105 BUILT_IN_INIT_DWARF_REG_SIZES
, BUILT_IN_NORMAL
, NULL_PTR
);
3106 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3107 BUILT_IN_FROB_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3108 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3109 BUILT_IN_EXTRACT_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3111 ("__builtin_eh_return",
3112 build_function_type (void_type_node
,
3113 tree_cons (NULL_TREE
, ptr_type_node
,
3114 tree_cons (NULL_TREE
,
3115 type_for_mode (ptr_mode
, 0),
3116 tree_cons (NULL_TREE
,
3119 BUILT_IN_EH_RETURN
, BUILT_IN_NORMAL
, NULL_PTR
);
3121 pedantic_lvalues
= pedantic
;
3123 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3124 make_fname_decl
= c_make_fname_decl
;
3125 declare_function_name ();
3127 start_identifier_warnings ();
3129 /* Prepare to check format strings against argument lists. */
3130 init_function_format_info ();
3134 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3136 /* Record our roots. */
3138 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3139 ggc_add_tree_root (&named_labels
, 1);
3140 ggc_add_tree_root (&shadowed_labels
, 1);
3141 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3142 mark_binding_level
);
3143 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3144 mark_binding_level
);
3145 ggc_add_tree_root (&static_ctors
, 1);
3146 ggc_add_tree_root (&static_dtors
, 1);
3149 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3150 decl, NAME is the initialization string and TYPE_DEP indicates whether
3151 NAME depended on the type of the function. As we don't yet implement
3152 delayed emission of static data, we mark the decl as emitted
3153 so it is not placed in the output. Anything using it must therefore pull
3154 out the STRING_CST initializer directly. This does mean that these names
3155 are string merging candidates, which C99 does not permit. */
3158 c_make_fname_decl (id
, name
, type_dep
)
3161 int type_dep ATTRIBUTE_UNUSED
;
3163 tree decl
, type
, init
;
3164 size_t length
= strlen (name
);
3166 type
= build_array_type
3167 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
3168 build_index_type (build_int_2 (length
, 0)));
3170 decl
= build_decl (VAR_DECL
, id
, type
);
3171 TREE_STATIC (decl
) = 1;
3172 TREE_READONLY (decl
) = 1;
3173 TREE_ASM_WRITTEN (decl
) = 1;
3174 DECL_SOURCE_LINE (decl
) = 0;
3175 DECL_ARTIFICIAL (decl
) = 1;
3176 DECL_IN_SYSTEM_HEADER (decl
) = 1;
3177 DECL_IGNORED_P (decl
) = 1;
3178 init
= build_string (length
+ 1, name
);
3179 TREE_TYPE (init
) = type
;
3180 DECL_INITIAL (decl
) = init
;
3181 finish_decl (pushdecl (decl
), init
, NULL_TREE
);
3186 /* Return a definition for a builtin function named NAME and whose data type
3187 is TYPE. TYPE should be a function type with argument types.
3188 FUNCTION_CODE tells later passes how to compile calls to this function.
3189 See tree.h for its possible values.
3191 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3192 the name to be called if we can't opencode the function. */
3195 builtin_function (name
, type
, function_code
, class, library_name
)
3199 enum built_in_class
class;
3200 const char *library_name
;
3202 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3203 DECL_EXTERNAL (decl
) = 1;
3204 TREE_PUBLIC (decl
) = 1;
3205 /* If -traditional, permit redefining a builtin function any way you like.
3206 (Though really, if the program redefines these functions,
3207 it probably won't work right unless compiled with -fno-builtin.) */
3208 if (flag_traditional
&& name
[0] != '_')
3209 DECL_BUILT_IN_NONANSI (decl
) = 1;
3211 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3212 make_decl_rtl (decl
, NULL_PTR
, 1);
3214 DECL_BUILT_IN_CLASS (decl
) = class;
3215 DECL_FUNCTION_CODE (decl
) = function_code
;
3217 /* Warn if a function in the namespace for users
3218 is used without an occasion to consider it declared. */
3219 if (name
[0] != '_' || name
[1] != '_')
3220 C_DECL_ANTICIPATED (decl
) = 1;
3225 /* Called when a declaration is seen that contains no names to declare.
3226 If its type is a reference to a structure, union or enum inherited
3227 from a containing scope, shadow that tag name for the current scope
3228 with a forward reference.
3229 If its type defines a new named structure or union
3230 or defines an enum, it is valid but we need not do anything here.
3231 Otherwise, it is an error. */
3234 shadow_tag (declspecs
)
3237 shadow_tag_warned (declspecs
, 0);
3241 shadow_tag_warned (declspecs
, warned
)
3244 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3251 pending_invalid_xref
= 0;
3253 /* Remove the attributes from declspecs, since they will confuse the
3255 split_specs_attrs (declspecs
, &specs
, &attrs
);
3257 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3259 register tree value
= TREE_VALUE (link
);
3260 register enum tree_code code
= TREE_CODE (value
);
3262 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3263 /* Used to test also that TYPE_SIZE (value) != 0.
3264 That caused warning for `struct foo;' at top level in the file. */
3266 register tree name
= lookup_tag_reverse (value
);
3273 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3274 /* Empty unnamed enum OK */
3276 pedwarn ("unnamed struct/union that defines no instances");
3282 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3286 t
= make_node (code
);
3293 if (!warned
&& ! in_system_header
)
3295 warning ("useless keyword or type name in empty declaration");
3302 error ("two types specified in one empty declaration");
3307 pedwarn ("empty declaration");
3311 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3314 groktypename (typename
)
3317 if (TREE_CODE (typename
) != TREE_LIST
)
3319 return grokdeclarator (TREE_VALUE (typename
),
3320 TREE_PURPOSE (typename
),
3324 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3327 groktypename_in_parm_context (typename
)
3330 if (TREE_CODE (typename
) != TREE_LIST
)
3332 return grokdeclarator (TREE_VALUE (typename
),
3333 TREE_PURPOSE (typename
),
3337 /* Decode a declarator in an ordinary declaration or data definition.
3338 This is called as soon as the type information and variable name
3339 have been parsed, before parsing the initializer if any.
3340 Here we create the ..._DECL node, fill in its type,
3341 and put it on the list of decls for the current context.
3342 The ..._DECL node is returned as the value.
3344 Exception: for arrays where the length is not specified,
3345 the type is left null, to be filled in by `finish_decl'.
3347 Function definitions do not come here; they go to start_function
3348 instead. However, external and forward declarations of functions
3349 do go through here. Structure field declarations are done by
3350 grokfield and not through here. */
3353 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3354 tree declarator
, declspecs
;
3356 tree attributes
, prefix_attributes
;
3358 register tree decl
= grokdeclarator (declarator
, declspecs
,
3359 NORMAL
, initialized
);
3362 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3363 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl
)), "main"))
3364 warning_with_decl (decl
, "`%s' is usually a function");
3367 /* Is it valid for this decl to have an initializer at all?
3368 If not, set INITIALIZED to zero, which will indirectly
3369 tell `finish_decl' to ignore the initializer once it is parsed. */
3370 switch (TREE_CODE (decl
))
3373 /* typedef foo = bar means give foo the same type as bar.
3374 We haven't parsed bar yet, so `finish_decl' will fix that up.
3375 Any other case of an initialization in a TYPE_DECL is an error. */
3376 if (pedantic
|| list_length (declspecs
) > 1)
3378 error ("typedef `%s' is initialized",
3379 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3385 error ("function `%s' is initialized like a variable",
3386 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3391 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3392 error ("parameter `%s' is initialized",
3393 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3398 /* Don't allow initializations for incomplete types
3399 except for arrays which might be completed by the initialization. */
3400 if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3402 /* A complete type is ok if size is fixed. */
3404 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3405 || C_DECL_VARIABLE_SIZE (decl
))
3407 error ("variable-sized object may not be initialized");
3411 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3413 error ("variable `%s' has initializer but incomplete type",
3414 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3417 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
3419 error ("elements of array `%s' have incomplete type",
3420 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3427 #if 0 /* Seems redundant with grokdeclarator. */
3428 if (current_binding_level
!= global_binding_level
3429 && DECL_EXTERNAL (decl
)
3430 && TREE_CODE (decl
) != FUNCTION_DECL
)
3431 warning ("declaration of `%s' has `extern' and is initialized",
3432 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3434 DECL_EXTERNAL (decl
) = 0;
3435 if (current_binding_level
== global_binding_level
)
3436 TREE_STATIC (decl
) = 1;
3438 /* Tell `pushdecl' this is an initialized decl
3439 even though we don't yet have the initializer expression.
3440 Also tell `finish_decl' it may store the real initializer. */
3441 DECL_INITIAL (decl
) = error_mark_node
;
3444 /* If this is a function declaration, write a record describing it to the
3445 prototypes file (if requested). */
3447 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3448 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3450 /* ANSI specifies that a tentative definition which is not merged with
3451 a non-tentative definition behaves exactly like a definition with an
3452 initializer equal to zero. (Section 3.7.2)
3453 -fno-common gives strict ANSI behavior. Usually you don't want it.
3454 This matters only for variables with external linkage. */
3455 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3456 DECL_COMMON (decl
) = 1;
3458 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3459 SET_DEFAULT_DECL_ATTRIBUTES (decl
, attributes
);
3462 /* Set attributes here so if duplicate decl, will have proper attributes. */
3463 decl_attributes (decl
, attributes
, prefix_attributes
);
3465 /* Add this decl to the current binding level.
3466 TEM may equal DECL or it may be a previous decl of the same name. */
3467 tem
= pushdecl (decl
);
3469 /* For a local variable, define the RTL now. */
3470 if (current_binding_level
!= global_binding_level
3471 /* But not if this is a duplicate decl
3472 and we preserved the rtl from the previous one
3473 (which may or may not happen). */
3474 && DECL_RTL (tem
) == 0)
3476 if (COMPLETE_TYPE_P (TREE_TYPE (tem
)))
3478 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3479 && DECL_INITIAL (tem
) != 0)
3486 /* Finish processing of a declaration;
3487 install its initial value.
3488 If the length of an array type is not known before,
3489 it must be determined now, from the initial value, or it is an error. */
3492 finish_decl (decl
, init
, asmspec_tree
)
3496 register tree type
= TREE_TYPE (decl
);
3497 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3500 /* If a name was specified, get the string. */
3502 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3504 /* If `start_decl' didn't like having an initialization, ignore it now. */
3506 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3508 /* Don't crash if parm is initialized. */
3509 if (TREE_CODE (decl
) == PARM_DECL
)
3512 if (ITERATOR_P (decl
))
3515 error_with_decl (decl
, "iterator has no initial value");
3517 init
= save_expr (init
);
3522 if (TREE_CODE (decl
) != TYPE_DECL
)
3523 store_init_value (decl
, init
);
3526 /* typedef foo = bar; store the type of bar as the type of foo. */
3527 TREE_TYPE (decl
) = TREE_TYPE (init
);
3528 DECL_INITIAL (decl
) = init
= 0;
3532 /* Deduce size of array from initialization, if not already known */
3534 if (TREE_CODE (type
) == ARRAY_TYPE
3535 && TYPE_DOMAIN (type
) == 0
3536 && TREE_CODE (decl
) != TYPE_DECL
)
3539 = (TREE_STATIC (decl
)
3540 /* Even if pedantic, an external linkage array
3541 may have incomplete type at first. */
3542 ? pedantic
&& !TREE_PUBLIC (decl
)
3543 : !DECL_EXTERNAL (decl
));
3545 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3547 /* Get the completed type made by complete_array_type. */
3548 type
= TREE_TYPE (decl
);
3551 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3556 error_with_decl (decl
, "array size missing in `%s'");
3557 /* If a `static' var's size isn't known,
3558 make it extern as well as static, so it does not get
3560 If it is not `static', then do not mark extern;
3561 finish_incomplete_decl will give it a default size
3562 and it will get allocated. */
3563 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3564 DECL_EXTERNAL (decl
) = 1;
3567 /* TYPE_MAX_VALUE is always one less than the number of elements
3568 in the array, because we start counting at zero. Therefore,
3569 warn only if the value is less than zero. */
3570 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3571 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3572 error_with_decl (decl
, "zero or negative size array `%s'");
3574 layout_decl (decl
, 0);
3577 if (TREE_CODE (decl
) == VAR_DECL
)
3579 if (DECL_SIZE (decl
) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3580 layout_decl (decl
, 0);
3582 if (DECL_SIZE (decl
) == 0
3583 && (TREE_STATIC (decl
)
3585 /* A static variable with an incomplete type
3586 is an error if it is initialized.
3587 Also if it is not file scope.
3588 Otherwise, let it through, but if it is not `extern'
3589 then it may cause an error message later. */
3590 /* A duplicate_decls call could have changed an extern
3591 declaration into a file scope one. This can be detected
3592 by TREE_ASM_WRITTEN being set. */
3593 (DECL_INITIAL (decl
) != 0
3594 || (DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
)))
3596 /* An automatic variable with an incomplete type
3598 !DECL_EXTERNAL (decl
)))
3600 error_with_decl (decl
, "storage size of `%s' isn't known");
3601 TREE_TYPE (decl
) = error_mark_node
;
3604 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3605 && DECL_SIZE (decl
) != 0)
3607 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3608 constant_expression_warning (DECL_SIZE (decl
));
3610 error_with_decl (decl
, "storage size of `%s' isn't constant");
3613 if (TREE_USED (type
))
3614 TREE_USED (decl
) = 1;
3617 /* If this is a function and an assembler name is specified, it isn't
3618 builtin any more. Also reset DECL_RTL so we can give it its new
3620 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3622 DECL_BUILT_IN_CLASS (decl
) = NOT_BUILT_IN
;
3623 DECL_RTL (decl
) = 0;
3624 DECL_ASSEMBLER_NAME (decl
) = get_identifier (asmspec
);
3627 /* Output the assembler code and/or RTL code for variables and functions,
3628 unless the type is an undefined structure or union.
3629 If not, it will get done when the type is completed. */
3631 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3633 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3634 maybe_objc_check_decl (decl
);
3635 rest_of_decl_compilation (decl
, asmspec
,
3636 (DECL_CONTEXT (decl
) == 0
3637 || TREE_ASM_WRITTEN (decl
)), 0);
3639 if (DECL_CONTEXT (decl
) != 0)
3641 /* Recompute the RTL of a local array now
3642 if it used to be an incomplete type. */
3644 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3646 /* If we used it already as memory, it must stay in memory. */
3647 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3648 /* If it's still incomplete now, no init will save it. */
3649 if (DECL_SIZE (decl
) == 0)
3650 DECL_INITIAL (decl
) = 0;
3653 /* Compute and store the initial value. */
3654 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3655 expand_decl_init (decl
);
3659 if (TREE_CODE (decl
) == TYPE_DECL
)
3661 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3662 maybe_objc_check_decl (decl
);
3663 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0, 0);
3666 /* At the end of a declaration, throw away any variable type sizes
3667 of types defined inside that declaration. There is no use
3668 computing them in the following function definition. */
3669 if (current_binding_level
== global_binding_level
)
3670 get_pending_sizes ();
3673 /* If DECL has a cleanup, build and return that cleanup here.
3674 This is a callback called by expand_expr. */
3677 maybe_build_cleanup (decl
)
3678 tree decl ATTRIBUTE_UNUSED
;
3680 /* There are no cleanups in C. */
3684 /* Given a parsed parameter declaration,
3685 decode it into a PARM_DECL and push that on the current binding level.
3686 Also, for the sake of forward parm decls,
3687 record the given order of parms in `parm_order'. */
3690 push_parm_decl (parm
)
3694 int old_immediate_size_expand
= immediate_size_expand
;
3695 /* Don't try computing parm sizes now -- wait till fn is called. */
3696 immediate_size_expand
= 0;
3698 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3699 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3700 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3701 TREE_PURPOSE (TREE_VALUE (parm
)));
3704 if (DECL_NAME (decl
))
3707 olddecl
= lookup_name (DECL_NAME (decl
));
3708 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3709 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3713 decl
= pushdecl (decl
);
3715 immediate_size_expand
= old_immediate_size_expand
;
3717 current_binding_level
->parm_order
3718 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3720 /* Add this decl to the current binding level. */
3721 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3724 /* Clear the given order of parms in `parm_order'.
3725 Used at start of parm list,
3726 and also at semicolon terminating forward decls. */
3731 current_binding_level
->parm_order
= NULL_TREE
;
3734 /* Make TYPE a complete type based on INITIAL_VALUE.
3735 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3736 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3739 complete_array_type (type
, initial_value
, do_default
)
3744 register tree maxindex
= NULL_TREE
;
3749 /* Note MAXINDEX is really the maximum index,
3750 one less than the size. */
3751 if (TREE_CODE (initial_value
) == STRING_CST
)
3754 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3755 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3758 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3760 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3761 maxindex
= build_int_2 (-1, -1);
3762 for (; elts
; elts
= TREE_CHAIN (elts
))
3764 if (TREE_PURPOSE (elts
))
3765 maxindex
= TREE_PURPOSE (elts
);
3767 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3768 maxindex
, integer_one_node
));
3770 maxindex
= copy_node (maxindex
);
3774 /* Make an error message unless that happened already. */
3775 if (initial_value
!= error_mark_node
)
3778 /* Prevent further error messages. */
3779 maxindex
= build_int_2 (0, 0);
3786 maxindex
= build_int_2 (0, 0);
3792 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3793 if (!TREE_TYPE (maxindex
))
3794 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3797 /* Lay out the type now that we can get the real answer. */
3804 /* Given declspecs and a declarator,
3805 determine the name and type of the object declared
3806 and construct a ..._DECL node for it.
3807 (In one case we can return a ..._TYPE node instead.
3808 For invalid input we sometimes return 0.)
3810 DECLSPECS is a chain of tree_list nodes whose value fields
3811 are the storage classes and type specifiers.
3813 DECL_CONTEXT says which syntactic context this declaration is in:
3814 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3815 FUNCDEF for a function definition. Like NORMAL but a few different
3816 error messages in each case. Return value may be zero meaning
3817 this definition is too screwy to try to parse.
3818 PARM for a parameter declaration (either within a function prototype
3819 or before a function body). Make a PARM_DECL, or return void_type_node.
3820 TYPENAME if for a typename (in a cast or sizeof).
3821 Don't make a DECL node; just return the ..._TYPE node.
3822 FIELD for a struct or union field; make a FIELD_DECL.
3823 BITFIELD for a field with specified width.
3824 INITIALIZED is 1 if the decl has an initializer.
3826 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3827 It may also be so in the PARM case, for a prototype where the
3828 argument type is specified but not the name.
3830 This function is where the complicated C meanings of `static'
3831 and `extern' are interpreted. */
3834 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
3837 enum decl_context decl_context
;
3842 tree type
= NULL_TREE
;
3847 int type_quals
= TYPE_UNQUALIFIED
;
3849 int explicit_int
= 0;
3850 int explicit_char
= 0;
3851 int defaulted_int
= 0;
3852 tree typedef_decl
= 0;
3854 tree typedef_type
= 0;
3855 int funcdef_flag
= 0;
3856 enum tree_code innermost_code
= ERROR_MARK
;
3858 int size_varies
= 0;
3859 tree decl_machine_attr
= NULL_TREE
;
3861 if (decl_context
== BITFIELD
)
3862 bitfield
= 1, decl_context
= FIELD
;
3864 if (decl_context
== FUNCDEF
)
3865 funcdef_flag
= 1, decl_context
= NORMAL
;
3867 /* Look inside a declarator for the name being declared
3868 and get it as a string, for an error message. */
3870 register tree decl
= declarator
;
3874 switch (TREE_CODE (decl
))
3879 innermost_code
= TREE_CODE (decl
);
3880 decl
= TREE_OPERAND (decl
, 0);
3883 case IDENTIFIER_NODE
:
3884 name
= IDENTIFIER_POINTER (decl
);
3895 /* A function definition's declarator must have the form of
3896 a function declarator. */
3898 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3901 /* Anything declared one level down from the top level
3902 must be one of the parameters of a function
3903 (because the body is at least two levels down). */
3905 /* If this looks like a function definition, make it one,
3906 even if it occurs where parms are expected.
3907 Then store_parm_decls will reject it and not use it as a parm. */
3908 if (decl_context
== NORMAL
&& !funcdef_flag
3909 && current_binding_level
->parm_flag
)
3910 decl_context
= PARM
;
3912 /* Look through the decl specs and record which ones appear.
3913 Some typespecs are defined as built-in typenames.
3914 Others, the ones that are modifiers of other types,
3915 are represented by bits in SPECBITS: set the bits for
3916 the modifiers that appear. Storage class keywords are also in SPECBITS.
3918 If there is a typedef name or a type, store the type in TYPE.
3919 This includes builtin typedefs such as `int'.
3921 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3922 and did not come from a user typedef.
3924 Set LONGLONG if `long' is mentioned twice. */
3926 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3929 register tree id
= TREE_VALUE (spec
);
3931 if (id
== ridpointers
[(int) RID_INT
])
3933 if (id
== ridpointers
[(int) RID_CHAR
])
3936 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3937 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
3939 if (ridpointers
[i
] == id
)
3941 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
3944 error ("`long long long' is too long for GCC");
3947 if (pedantic
&& ! in_system_header
&& warn_long_long
)
3948 pedwarn ("ANSI C does not support `long long'");
3952 else if (specbits
& (1 << i
))
3953 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3959 error ("two or more data types in declaration of `%s'", name
);
3960 /* Actual typedefs come to us as TYPE_DECL nodes. */
3961 else if (TREE_CODE (id
) == TYPE_DECL
)
3963 type
= TREE_TYPE (id
);
3964 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
3967 /* Built-in types come as identifiers. */
3968 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3970 register tree t
= lookup_name (id
);
3971 if (TREE_TYPE (t
) == error_mark_node
)
3973 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3974 error ("`%s' fails to be a typedef or built in type",
3975 IDENTIFIER_POINTER (id
));
3978 type
= TREE_TYPE (t
);
3982 else if (TREE_CODE (id
) != ERROR_MARK
)
3988 typedef_type
= type
;
3990 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3992 /* No type at all: default to `int', and set DEFAULTED_INT
3993 because it was not a user-defined typedef. */
3997 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3998 | (1 << (int) RID_SIGNED
)
3999 | (1 << (int) RID_UNSIGNED
))))
4000 /* Don't warn about typedef foo = bar. */
4001 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4002 && ! in_system_header
)
4004 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4005 and this is a function, or if -Wimplicit; prefer the former
4006 warning since it is more explicit. */
4007 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4008 warn_about_return_type
= 1;
4009 else if (warn_implicit_int
|| flag_isoc99
)
4010 warning ("type defaults to `int' in declaration of `%s'", name
);
4014 type
= integer_type_node
;
4017 /* Now process the modifiers that were specified
4018 and check for invalid combinations. */
4020 /* Long double is a special combination. */
4022 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4023 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4025 specbits
&= ~ (1 << (int) RID_LONG
);
4026 type
= long_double_type_node
;
4029 /* Check all other uses of type modifiers. */
4031 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4032 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4036 if ((specbits
& 1 << (int) RID_LONG
)
4037 && (specbits
& 1 << (int) RID_SHORT
))
4038 error ("both long and short specified for `%s'", name
);
4039 else if (((specbits
& 1 << (int) RID_LONG
)
4040 || (specbits
& 1 << (int) RID_SHORT
))
4042 error ("long or short specified with char for `%s'", name
);
4043 else if (((specbits
& 1 << (int) RID_LONG
)
4044 || (specbits
& 1 << (int) RID_SHORT
))
4045 && TREE_CODE (type
) == REAL_TYPE
)
4047 static int already
= 0;
4049 error ("long or short specified with floating type for `%s'", name
);
4050 if (! already
&& ! pedantic
)
4052 error ("the only valid combination is `long double'");
4056 else if ((specbits
& 1 << (int) RID_SIGNED
)
4057 && (specbits
& 1 << (int) RID_UNSIGNED
))
4058 error ("both signed and unsigned specified for `%s'", name
);
4059 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4060 error ("long, short, signed or unsigned invalid for `%s'", name
);
4064 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4066 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4068 if (flag_pedantic_errors
)
4073 /* Discard the type modifiers if they are invalid. */
4076 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4077 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4082 if ((specbits
& (1 << (int) RID_COMPLEX
))
4083 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4085 error ("complex invalid for `%s'", name
);
4086 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4089 /* Decide whether an integer type is signed or not.
4090 Optionally treat bitfields as signed by default. */
4091 if (specbits
& 1 << (int) RID_UNSIGNED
4092 /* Traditionally, all bitfields are unsigned. */
4093 || (bitfield
&& flag_traditional
4094 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4095 || (bitfield
&& ! flag_signed_bitfields
4096 && (explicit_int
|| defaulted_int
|| explicit_char
4097 /* A typedef for plain `int' without `signed'
4098 can be controlled just like plain `int'. */
4099 || ! (typedef_decl
!= 0
4100 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4101 && TREE_CODE (type
) != ENUMERAL_TYPE
4102 && !(specbits
& 1 << (int) RID_SIGNED
)))
4105 type
= long_long_unsigned_type_node
;
4106 else if (specbits
& 1 << (int) RID_LONG
)
4107 type
= long_unsigned_type_node
;
4108 else if (specbits
& 1 << (int) RID_SHORT
)
4109 type
= short_unsigned_type_node
;
4110 else if (type
== char_type_node
)
4111 type
= unsigned_char_type_node
;
4112 else if (typedef_decl
)
4113 type
= unsigned_type (type
);
4115 type
= unsigned_type_node
;
4117 else if ((specbits
& 1 << (int) RID_SIGNED
)
4118 && type
== char_type_node
)
4119 type
= signed_char_type_node
;
4121 type
= long_long_integer_type_node
;
4122 else if (specbits
& 1 << (int) RID_LONG
)
4123 type
= long_integer_type_node
;
4124 else if (specbits
& 1 << (int) RID_SHORT
)
4125 type
= short_integer_type_node
;
4127 if (specbits
& 1 << (int) RID_COMPLEX
)
4129 /* If we just have "complex", it is equivalent to
4130 "complex double", but if any modifiers at all are specified it is
4131 the complex form of TYPE. E.g, "complex short" is
4132 "complex short int". */
4134 if (defaulted_int
&& ! longlong
4135 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4136 | (1 << (int) RID_SIGNED
)
4137 | (1 << (int) RID_UNSIGNED
))))
4138 type
= complex_double_type_node
;
4139 else if (type
== integer_type_node
)
4140 type
= complex_integer_type_node
;
4141 else if (type
== float_type_node
)
4142 type
= complex_float_type_node
;
4143 else if (type
== double_type_node
)
4144 type
= complex_double_type_node
;
4145 else if (type
== long_double_type_node
)
4146 type
= complex_long_double_type_node
;
4148 type
= build_complex_type (type
);
4151 /* Figure out the type qualifiers for the declaration. There are
4152 two ways a declaration can become qualified. One is something
4153 like `const int i' where the `const' is explicit. Another is
4154 something like `typedef const int CI; CI i' where the type of the
4155 declaration contains the `const'. */
4156 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4157 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4158 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4159 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4161 pedwarn ("duplicate `const'");
4163 pedwarn ("duplicate `restrict'");
4165 pedwarn ("duplicate `volatile'");
4166 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4167 type
= TYPE_MAIN_VARIANT (type
);
4168 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4169 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4170 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4172 /* Warn if two storage classes are given. Default to `auto'. */
4177 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4178 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4179 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4180 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4181 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4182 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4184 /* Warn about storage classes that are invalid for certain
4185 kinds of declarations (parameters, typenames, etc.). */
4188 error ("multiple storage classes in declaration of `%s'", name
);
4189 else if (funcdef_flag
4191 & ((1 << (int) RID_REGISTER
)
4192 | (1 << (int) RID_AUTO
)
4193 | (1 << (int) RID_TYPEDEF
))))
4195 if (specbits
& 1 << (int) RID_AUTO
4196 && (pedantic
|| current_binding_level
== global_binding_level
))
4197 pedwarn ("function definition declared `auto'");
4198 if (specbits
& 1 << (int) RID_REGISTER
)
4199 error ("function definition declared `register'");
4200 if (specbits
& 1 << (int) RID_TYPEDEF
)
4201 error ("function definition declared `typedef'");
4202 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4203 | (1 << (int) RID_AUTO
));
4205 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4207 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4211 switch (decl_context
)
4214 error ("storage class specified for structure field `%s'", name
);
4217 error ("storage class specified for parameter `%s'", name
);
4220 error ("storage class specified for typename");
4223 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4224 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4225 | (1 << (int) RID_EXTERN
));
4228 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4230 /* `extern' with initialization is invalid if not at top level. */
4231 if (current_binding_level
== global_binding_level
)
4232 warning ("`%s' initialized and declared `extern'", name
);
4234 error ("`%s' has both `extern' and initializer", name
);
4236 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4237 && current_binding_level
!= global_binding_level
)
4238 error ("nested function `%s' declared `extern'", name
);
4239 else if (current_binding_level
== global_binding_level
4240 && specbits
& (1 << (int) RID_AUTO
))
4241 error ("top-level declaration of `%s' specifies `auto'", name
);
4242 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4243 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4245 error ("iterator `%s' has derived type", name
);
4246 type
= error_mark_node
;
4248 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4249 && TREE_CODE (type
) != INTEGER_TYPE
)
4251 error ("iterator `%s' has noninteger type", name
);
4252 type
= error_mark_node
;
4256 /* Now figure out the structure of the declarator proper.
4257 Descend through it, creating more complex types, until we reach
4258 the declared identifier (or NULL_TREE, in an absolute declarator). */
4260 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4262 if (type
== error_mark_node
)
4264 declarator
= TREE_OPERAND (declarator
, 0);
4268 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4269 an INDIRECT_REF (for *...),
4270 a CALL_EXPR (for ...(...)),
4271 an identifier (for the name being declared)
4272 or a null pointer (for the place in an absolute declarator
4273 where the name was omitted).
4274 For the last two cases, we have just exited the loop.
4276 At this point, TYPE is the type of elements of an array,
4277 or for a function to return, or for a pointer to point to.
4278 After this sequence of ifs, TYPE is the type of the
4279 array or function or pointer, and DECLARATOR has had its
4280 outermost layer removed. */
4282 if (TREE_CODE (declarator
) == ARRAY_REF
)
4284 register tree itype
= NULL_TREE
;
4285 register tree size
= TREE_OPERAND (declarator
, 1);
4286 /* The index is a signed object `sizetype' bits wide. */
4287 tree index_type
= signed_type (sizetype
);
4289 declarator
= TREE_OPERAND (declarator
, 0);
4291 /* Check for some types that there cannot be arrays of. */
4293 if (VOID_TYPE_P (type
))
4295 error ("declaration of `%s' as array of voids", name
);
4296 type
= error_mark_node
;
4299 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4301 error ("declaration of `%s' as array of functions", name
);
4302 type
= error_mark_node
;
4305 if (size
== error_mark_node
)
4306 type
= error_mark_node
;
4308 if (type
== error_mark_node
)
4311 /* If size was specified, set ITYPE to a range-type for that size.
4312 Otherwise, ITYPE remains null. finish_decl may figure it out
4313 from an initial value. */
4317 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4318 STRIP_TYPE_NOPS (size
);
4320 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4321 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4323 error ("size of array `%s' has non-integer type", name
);
4324 size
= integer_one_node
;
4327 if (pedantic
&& integer_zerop (size
))
4328 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4330 if (TREE_CODE (size
) == INTEGER_CST
)
4332 constant_expression_warning (size
);
4333 if (tree_int_cst_sgn (size
) < 0)
4335 error ("size of array `%s' is negative", name
);
4336 size
= integer_one_node
;
4341 /* Make sure the array size remains visibly nonconstant
4342 even if it is (eg) a const variable with known value. */
4347 if (TREE_CONSTANT (size
))
4348 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4350 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4354 /* Convert size to index_type, so that if it is a variable
4355 the computations will be done in the proper mode. */
4356 itype
= fold (build (MINUS_EXPR
, index_type
,
4357 convert (index_type
, size
),
4358 convert (index_type
, size_one_node
)));
4360 /* If that overflowed, the array is too big.
4361 ??? While a size of INT_MAX+1 technically shouldn't cause
4362 an overflow (because we subtract 1), the overflow is recorded
4363 during the conversion to index_type, before the subtraction.
4364 Handling this case seems like an unnecessary complication. */
4365 if (TREE_OVERFLOW (itype
))
4367 error ("size of array `%s' is too large", name
);
4368 type
= error_mark_node
;
4373 itype
= variable_size (itype
);
4374 itype
= build_index_type (itype
);
4377 #if 0 /* This had bad results for pointers to arrays, as in
4378 union incomplete (*foo)[4]; */
4379 /* Complain about arrays of incomplete types, except in typedefs. */
4381 if (!COMPLETE_TYPE_P (type
)
4382 /* Avoid multiple warnings for nested array types. */
4383 && TREE_CODE (type
) != ARRAY_TYPE
4384 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4385 && !C_TYPE_BEING_DEFINED (type
))
4386 warning ("array type has incomplete element type");
4389 #if 0 /* We shouldn't have a function type here at all!
4390 Functions aren't allowed as array elements. */
4391 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4392 && (constp
|| volatilep
))
4393 pedwarn ("ANSI C forbids const or volatile function types");
4396 /* Build the array type itself, then merge any constancy or
4397 volatility into the target type. We must do it in this order
4398 to ensure that the TYPE_MAIN_VARIANT field of the array type
4399 is set correctly. */
4401 type
= build_array_type (type
, itype
);
4403 type
= c_build_qualified_type (type
, type_quals
);
4405 #if 0 /* don't clear these; leave them set so that the array type
4406 or the variable is itself const or volatile. */
4407 type_quals
= TYPE_UNQUALIFIED
;
4411 C_TYPE_VARIABLE_SIZE (type
) = 1;
4413 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4417 /* Declaring a function type.
4418 Make sure we have a valid type for the function to return. */
4419 if (type
== error_mark_node
)
4424 /* Warn about some types functions can't return. */
4426 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4428 error ("`%s' declared as function returning a function", name
);
4429 type
= integer_type_node
;
4431 if (TREE_CODE (type
) == ARRAY_TYPE
)
4433 error ("`%s' declared as function returning an array", name
);
4434 type
= integer_type_node
;
4437 #ifndef TRADITIONAL_RETURN_FLOAT
4438 /* Traditionally, declaring return type float means double. */
4440 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4441 type
= double_type_node
;
4442 #endif /* TRADITIONAL_RETURN_FLOAT */
4444 /* Construct the function type and go to the next
4445 inner layer of declarator. */
4447 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4449 /* Say it's a definition
4450 only for the CALL_EXPR
4451 closest to the identifier. */
4452 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4453 /* Type qualifiers before the return type of the function
4454 qualify the return type, not the function type. */
4456 type
= c_build_qualified_type (type
, type_quals
);
4457 type_quals
= TYPE_UNQUALIFIED
;
4459 type
= build_function_type (type
, arg_types
);
4460 declarator
= TREE_OPERAND (declarator
, 0);
4462 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4463 the formal parameter list of this FUNCTION_TYPE to point to
4464 the FUNCTION_TYPE node itself. */
4469 for (link
= last_function_parm_tags
;
4471 link
= TREE_CHAIN (link
))
4472 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4475 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4477 /* Merge any constancy or volatility into the target type
4480 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4482 pedwarn ("ANSI C forbids qualified function types");
4484 type
= c_build_qualified_type (type
, type_quals
);
4485 type_quals
= TYPE_UNQUALIFIED
;
4488 type
= build_pointer_type (type
);
4490 /* Process a list of type modifier keywords
4491 (such as const or volatile) that were given inside the `*'. */
4493 if (TREE_TYPE (declarator
))
4495 register tree typemodlist
;
4501 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4502 typemodlist
= TREE_CHAIN (typemodlist
))
4504 tree qualifier
= TREE_VALUE (typemodlist
);
4506 if (qualifier
== ridpointers
[(int) RID_CONST
])
4508 else if (qualifier
== ridpointers
[(int) RID_VOLATILE
])
4510 else if (qualifier
== ridpointers
[(int) RID_RESTRICT
])
4515 error ("invalid type modifier within pointer declarator");
4519 pedwarn ("duplicate `const'");
4521 pedwarn ("duplicate `volatile'");
4523 pedwarn ("duplicate `restrict'");
4525 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4526 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4527 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4530 declarator
= TREE_OPERAND (declarator
, 0);
4537 /* Now TYPE has the actual type. */
4539 /* Did array size calculations overflow? */
4541 if (TREE_CODE (type
) == ARRAY_TYPE
4542 && COMPLETE_TYPE_P (type
)
4543 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4544 error ("size of array `%s' is too large", name
);
4546 /* If this is declaring a typedef name, return a TYPE_DECL. */
4548 if (specbits
& (1 << (int) RID_TYPEDEF
))
4551 /* Note that the grammar rejects storage classes
4552 in typenames, fields or parameters */
4553 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4555 pedwarn ("ANSI C forbids qualified function types");
4557 type
= c_build_qualified_type (type
, type_quals
);
4558 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4559 if ((specbits
& (1 << (int) RID_SIGNED
))
4560 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4561 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4565 /* Detect the case of an array type of unspecified size
4566 which came, as such, direct from a typedef name.
4567 We must copy the type, so that each identifier gets
4568 a distinct type, so that each identifier's size can be
4569 controlled separately by its own initializer. */
4571 if (type
!= 0 && typedef_type
!= 0
4572 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4573 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4575 type
= build_array_type (TREE_TYPE (type
), 0);
4577 C_TYPE_VARIABLE_SIZE (type
) = 1;
4580 /* If this is a type name (such as, in a cast or sizeof),
4581 compute the type and return it now. */
4583 if (decl_context
== TYPENAME
)
4585 /* Note that the grammar rejects storage classes
4586 in typenames, fields or parameters */
4587 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4589 pedwarn ("ANSI C forbids const or volatile function types");
4591 type
= c_build_qualified_type (type
, type_quals
);
4595 /* Aside from typedefs and type names (handle above),
4596 `void' at top level (not within pointer)
4597 is allowed only in public variables.
4598 We don't complain about parms either, but that is because
4599 a better error message can be made later. */
4601 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4602 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4603 && ((specbits
& (1 << (int) RID_EXTERN
))
4604 || (current_binding_level
== global_binding_level
4606 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4608 error ("variable or field `%s' declared void", name
);
4609 type
= integer_type_node
;
4612 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4613 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4618 if (decl_context
== PARM
)
4620 tree type_as_written
= type
;
4623 /* A parameter declared as an array of T is really a pointer to T.
4624 One declared as a function is really a pointer to a function. */
4626 if (TREE_CODE (type
) == ARRAY_TYPE
)
4628 /* Transfer const-ness of array into that of type pointed to. */
4629 type
= TREE_TYPE (type
);
4631 type
= c_build_qualified_type (type
, type_quals
);
4632 type
= build_pointer_type (type
);
4633 type_quals
= TYPE_UNQUALIFIED
;
4636 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4638 if (pedantic
&& type_quals
)
4639 pedwarn ("ANSI C forbids qualified function types");
4641 type
= c_build_qualified_type (type
, type_quals
);
4642 type
= build_pointer_type (type
);
4643 type_quals
= TYPE_UNQUALIFIED
;
4646 decl
= build_decl (PARM_DECL
, declarator
, type
);
4648 C_DECL_VARIABLE_SIZE (decl
) = 1;
4650 /* Compute the type actually passed in the parmlist,
4651 for the case where there is no prototype.
4652 (For example, shorts and chars are passed as ints.)
4653 When there is a prototype, this is overridden later. */
4655 if (type
== error_mark_node
)
4656 promoted_type
= type
;
4659 promoted_type
= simple_type_promotes_to (type
);
4660 if (! promoted_type
)
4661 promoted_type
= type
;
4664 DECL_ARG_TYPE (decl
) = promoted_type
;
4665 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4667 else if (decl_context
== FIELD
)
4669 /* Structure field. It may not be a function. */
4671 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4673 error ("field `%s' declared as a function", name
);
4674 type
= build_pointer_type (type
);
4676 else if (TREE_CODE (type
) != ERROR_MARK
4677 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4679 error ("field `%s' has incomplete type", name
);
4680 type
= error_mark_node
;
4682 /* Move type qualifiers down to element of an array. */
4683 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4685 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4687 TYPE_DOMAIN (type
));
4688 #if 0 /* Leave the field const or volatile as well. */
4689 type_quals
= TYPE_UNQUALIFIED
;
4692 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4693 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4696 C_DECL_VARIABLE_SIZE (decl
) = 1;
4698 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4700 /* Every function declaration is "external"
4701 except for those which are inside a function body
4702 in which `auto' is used.
4703 That is a case not specified by ANSI C,
4704 and we use it for forward declarations for nested functions. */
4705 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4706 || current_binding_level
== global_binding_level
);
4708 if (specbits
& (1 << (int) RID_AUTO
)
4709 && (pedantic
|| current_binding_level
== global_binding_level
))
4710 pedwarn ("invalid storage class for function `%s'", name
);
4711 if (specbits
& (1 << (int) RID_REGISTER
))
4712 error ("invalid storage class for function `%s'", name
);
4713 /* Function declaration not at top level.
4714 Storage classes other than `extern' are not allowed
4715 and `extern' makes no difference. */
4716 if (current_binding_level
!= global_binding_level
4717 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4719 pedwarn ("invalid storage class for function `%s'", name
);
4721 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4722 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4724 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4725 pedwarn ("ANSI C forbids qualified function types");
4728 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
)))
4729 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl
)))
4730 && ! DECL_IN_SYSTEM_HEADER (decl
))
4731 pedwarn ("ANSI C forbids qualified void function return type");
4733 /* GNU C interprets a `volatile void' return type to indicate
4734 that the function does not return. */
4735 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4736 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4737 warning ("`noreturn' function returns non-void value");
4740 DECL_EXTERNAL (decl
) = 1;
4741 /* Record absence of global scope for `static' or `auto'. */
4743 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4745 /* Record presence of `inline', if it is reasonable. */
4748 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4749 warning ("cannot inline function `main'");
4751 /* Assume that otherwise the function can be inlined. */
4752 DECL_INLINE (decl
) = 1;
4754 if (specbits
& (1 << (int) RID_EXTERN
))
4755 current_extern_inline
= 1;
4760 /* It's a variable. */
4761 /* An uninitialized decl with `extern' is a reference. */
4762 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4764 /* Move type qualifiers down to element of an array. */
4765 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4767 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4769 TYPE_DOMAIN (type
));
4770 #if 0 /* Leave the variable const or volatile as well. */
4771 type_quals
= TYPE_UNQUALIFIED
;
4775 decl
= build_decl (VAR_DECL
, declarator
, type
);
4777 C_DECL_VARIABLE_SIZE (decl
) = 1;
4780 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4782 DECL_EXTERNAL (decl
) = extern_ref
;
4783 /* At top level, the presence of a `static' or `register' storage
4784 class specifier, or the absence of all storage class specifiers
4785 makes this declaration a definition (perhaps tentative). Also,
4786 the absence of both `static' and `register' makes it public. */
4787 if (current_binding_level
== global_binding_level
)
4791 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4792 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4794 /* Not at top level, only `static' makes a static definition. */
4797 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4798 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4801 if (specbits
& 1 << (int) RID_ITERATOR
)
4802 ITERATOR_P (decl
) = 1;
4805 /* Record `register' declaration for warnings on &
4806 and in case doing stupid register allocation. */
4808 if (specbits
& (1 << (int) RID_REGISTER
))
4809 DECL_REGISTER (decl
) = 1;
4811 /* Record constancy and volatility. */
4812 c_apply_type_quals_to_decl (type_quals
, decl
);
4814 /* If a type has volatile components, it should be stored in memory.
4815 Otherwise, the fact that those components are volatile
4816 will be ignored, and would even crash the compiler. */
4817 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4818 mark_addressable (decl
);
4824 /* Decode the parameter-list info for a function type or function definition.
4825 The argument is the value returned by `get_parm_info' (or made in parse.y
4826 if there is an identifier list instead of a parameter decl list).
4827 These two functions are separate because when a function returns
4828 or receives functions then each is called multiple times but the order
4829 of calls is different. The last call to `grokparms' is always the one
4830 that contains the formal parameter names of a function definition.
4832 Store in `last_function_parms' a chain of the decls of parms.
4833 Also store in `last_function_parm_tags' a chain of the struct, union,
4834 and enum tags declared among the parms.
4836 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4838 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4839 a mere declaration. A nonempty identifier-list gets an error message
4840 when FUNCDEF_FLAG is zero. */
4843 grokparms (parms_info
, funcdef_flag
)
4847 tree first_parm
= TREE_CHAIN (parms_info
);
4849 last_function_parms
= TREE_PURPOSE (parms_info
);
4850 last_function_parm_tags
= TREE_VALUE (parms_info
);
4852 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4853 && !in_system_header
)
4854 warning ("function declaration isn't a prototype");
4857 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4860 pedwarn ("parameter names (without types) in function declaration");
4862 last_function_parms
= first_parm
;
4869 /* We no longer test FUNCDEF_FLAG.
4870 If the arg types are incomplete in a declaration,
4871 they must include undefined tags.
4872 These tags can never be defined in the scope of the declaration,
4873 so the types can never be completed,
4874 and no call can be compiled successfully. */
4876 /* In a fcn definition, arg types must be complete. */
4879 for (parm
= last_function_parms
, typelt
= first_parm
;
4881 parm
= TREE_CHAIN (parm
))
4882 /* Skip over any enumeration constants declared here. */
4883 if (TREE_CODE (parm
) == PARM_DECL
)
4885 /* Barf if the parameter itself has an incomplete type. */
4886 tree type
= TREE_VALUE (typelt
);
4887 if (!COMPLETE_TYPE_P (type
))
4889 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4890 error ("parameter `%s' has incomplete type",
4891 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4893 warning ("parameter has incomplete type");
4896 TREE_VALUE (typelt
) = error_mark_node
;
4897 TREE_TYPE (parm
) = error_mark_node
;
4900 #if 0 /* This has been replaced by parm_tags_warning
4901 which uses a more accurate criterion for what to warn about. */
4904 /* Now warn if is a pointer to an incomplete type. */
4905 while (TREE_CODE (type
) == POINTER_TYPE
4906 || TREE_CODE (type
) == REFERENCE_TYPE
)
4907 type
= TREE_TYPE (type
);
4908 type
= TYPE_MAIN_VARIANT (type
);
4909 if (!COMPLETE_TYPE_P (type
))
4911 if (DECL_NAME (parm
) != 0)
4912 warning ("parameter `%s' points to incomplete type",
4913 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4915 warning ("parameter points to incomplete type");
4919 typelt
= TREE_CHAIN (typelt
);
4927 /* Return a tree_list node with info on a parameter list just parsed.
4928 The TREE_PURPOSE is a chain of decls of those parms.
4929 The TREE_VALUE is a list of structure, union and enum tags defined.
4930 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4931 This tree_list node is later fed to `grokparms'.
4933 VOID_AT_END nonzero means append `void' to the end of the type-list.
4934 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4937 get_parm_info (void_at_end
)
4940 register tree decl
, t
;
4941 register tree types
= 0;
4943 tree tags
= gettags ();
4944 tree parms
= getdecls ();
4946 tree order
= current_binding_level
->parm_order
;
4948 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4949 if (void_at_end
&& parms
!= 0
4950 && TREE_CHAIN (parms
) == 0
4951 && VOID_TYPE_P (TREE_TYPE (parms
))
4952 && DECL_NAME (parms
) == 0)
4955 storedecls (NULL_TREE
);
4956 return tree_cons (NULL_TREE
, NULL_TREE
,
4957 tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
4960 /* Extract enumerator values and other non-parms declared with the parms.
4961 Likewise any forward parm decls that didn't have real parm decls. */
4962 for (decl
= parms
; decl
; )
4964 tree next
= TREE_CHAIN (decl
);
4966 if (TREE_CODE (decl
) != PARM_DECL
)
4968 TREE_CHAIN (decl
) = new_parms
;
4971 else if (TREE_ASM_WRITTEN (decl
))
4973 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
4974 TREE_CHAIN (decl
) = new_parms
;
4980 /* Put the parm decls back in the order they were in in the parm list. */
4981 for (t
= order
; t
; t
= TREE_CHAIN (t
))
4984 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
4986 TREE_CHAIN (TREE_VALUE (t
)) = 0;
4989 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
4992 /* Store the parmlist in the binding level since the old one
4993 is no longer a valid list. (We have changed the chain pointers.) */
4994 storedecls (new_parms
);
4996 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
4997 /* There may also be declarations for enumerators if an enumeration
4998 type is declared among the parms. Ignore them here. */
4999 if (TREE_CODE (decl
) == PARM_DECL
)
5001 /* Since there is a prototype,
5002 args are passed in their declared types. */
5003 tree type
= TREE_TYPE (decl
);
5004 DECL_ARG_TYPE (decl
) = type
;
5005 if (PROMOTE_PROTOTYPES
5006 && (TREE_CODE (type
) == INTEGER_TYPE
5007 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5008 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5009 DECL_ARG_TYPE (decl
) = integer_type_node
;
5011 types
= tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5012 if (VOID_TYPE_P (TREE_VALUE (types
)) && ! erred
5013 && DECL_NAME (decl
) == 0)
5015 error ("`void' in parameter list must be the entire list");
5021 return tree_cons (new_parms
, tags
,
5022 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
5024 return tree_cons (new_parms
, tags
, nreverse (types
));
5027 /* At end of parameter list, warn about any struct, union or enum tags
5028 defined within. Do so because these types cannot ever become complete. */
5031 parmlist_tags_warning ()
5036 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5038 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5039 /* An anonymous union parm type is meaningful as a GNU extension.
5040 So don't warn for that. */
5041 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5043 if (TREE_PURPOSE (elt
) != 0)
5044 warning ("`%s %s' declared inside parameter list",
5045 (code
== RECORD_TYPE
? "struct"
5046 : code
== UNION_TYPE
? "union"
5048 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5050 warning ("anonymous %s declared inside parameter list",
5051 (code
== RECORD_TYPE
? "struct"
5052 : code
== UNION_TYPE
? "union"
5057 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5063 /* Get the struct, enum or union (CODE says which) with tag NAME.
5064 Define the tag as a forward-reference if it is not defined. */
5067 xref_tag (code
, name
)
5068 enum tree_code code
;
5071 /* If a cross reference is requested, look up the type
5072 already defined for this tag and return it. */
5074 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5075 /* Even if this is the wrong type of tag, return what we found.
5076 There will be an error message anyway, from pending_xref_error.
5077 If we create an empty xref just for an invalid use of the type,
5078 the main result is to create lots of superfluous error messages. */
5082 /* If no such tag is yet defined, create a forward-reference node
5083 and record it as the "definition".
5084 When a real declaration of this type is found,
5085 the forward-reference will be altered into a real type. */
5087 ref
= make_node (code
);
5088 if (code
== ENUMERAL_TYPE
)
5090 /* (In ANSI, Enums can be referred to only if already defined.) */
5092 pedwarn ("ANSI C forbids forward references to `enum' types");
5093 /* Give the type a default layout like unsigned int
5094 to avoid crashing if it does not get defined. */
5095 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5096 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5097 TREE_UNSIGNED (ref
) = 1;
5098 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5099 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5100 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5103 pushtag (name
, ref
);
5108 /* Make sure that the tag NAME is defined *in the current binding level*
5109 at least as a forward reference.
5110 CODE says which kind of tag NAME ought to be. */
5113 start_struct (code
, name
)
5114 enum tree_code code
;
5117 /* If there is already a tag defined at this binding level
5118 (as a forward reference), just return it. */
5120 register tree ref
= 0;
5123 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5124 if (ref
&& TREE_CODE (ref
) == code
)
5126 C_TYPE_BEING_DEFINED (ref
) = 1;
5127 TYPE_PACKED (ref
) = flag_pack_struct
;
5128 if (TYPE_FIELDS (ref
))
5129 error ("redefinition of `%s %s'",
5130 code
== UNION_TYPE
? "union" : "struct",
5131 IDENTIFIER_POINTER (name
));
5136 /* Otherwise create a forward-reference just so the tag is in scope. */
5138 ref
= make_node (code
);
5139 pushtag (name
, ref
);
5140 C_TYPE_BEING_DEFINED (ref
) = 1;
5141 TYPE_PACKED (ref
) = flag_pack_struct
;
5145 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5146 of a structure component, returning a FIELD_DECL node.
5147 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5149 This is done during the parsing of the struct declaration.
5150 The FIELD_DECL nodes are chained together and the lot of them
5151 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5154 grokfield (filename
, line
, declarator
, declspecs
, width
)
5155 const char *filename ATTRIBUTE_UNUSED
;
5156 int line ATTRIBUTE_UNUSED
;
5157 tree declarator
, declspecs
, width
;
5161 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5163 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5164 DECL_INITIAL (value
) = width
;
5166 maybe_objc_check_decl (value
);
5170 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5171 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5172 ATTRIBUTES are attributes to be applied to the structure. */
5175 finish_struct (t
, fieldlist
, attributes
)
5181 int toplevel
= global_binding_level
== current_binding_level
;
5183 /* If this type was previously laid out as a forward reference,
5184 make sure we lay it out again. */
5188 decl_attributes (t
, attributes
, NULL_TREE
);
5190 /* Nameless union parm types are useful as GCC extension. */
5191 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5192 /* Otherwise, warn about any struct or union def. in parmlist. */
5193 if (in_parm_level_p ())
5196 pedwarn ("%s defined inside parms",
5197 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5198 else if (! flag_traditional
)
5199 warning ("%s defined inside parms",
5200 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5205 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5206 if (DECL_NAME (x
) != 0)
5210 pedwarn ("%s has no %smembers",
5211 TREE_CODE (t
) == UNION_TYPE
? "union" : "struct",
5212 fieldlist
? "named " : "");
5215 /* Install struct as DECL_CONTEXT of each field decl.
5216 Also process specified field sizes,m which is found in the DECL_INITIAL.
5217 Store 0 there, except for ": 0" fields (so we can find them
5218 and delete them, below). */
5220 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5222 DECL_CONTEXT (x
) = t
;
5223 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5225 /* If any field is const, the structure type is pseudo-const. */
5226 if (TREE_READONLY (x
))
5227 C_TYPE_FIELDS_READONLY (t
) = 1;
5230 /* A field that is pseudo-const makes the structure likewise. */
5231 tree t1
= TREE_TYPE (x
);
5232 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5233 t1
= TREE_TYPE (t1
);
5234 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5235 && C_TYPE_FIELDS_READONLY (t1
))
5236 C_TYPE_FIELDS_READONLY (t
) = 1;
5239 /* Any field that is volatile means variables of this type must be
5240 treated in some ways as volatile. */
5241 if (TREE_THIS_VOLATILE (x
))
5242 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5244 /* Any field of nominal variable size implies structure is too. */
5245 if (C_DECL_VARIABLE_SIZE (x
))
5246 C_TYPE_VARIABLE_SIZE (t
) = 1;
5248 /* Detect invalid nested redefinition. */
5249 if (TREE_TYPE (x
) == t
)
5250 error ("nested redefinition of `%s'",
5251 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5253 /* Detect invalid bit-field size. */
5254 if (DECL_INITIAL (x
))
5255 STRIP_NOPS (DECL_INITIAL (x
));
5256 if (DECL_INITIAL (x
))
5258 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5259 constant_expression_warning (DECL_INITIAL (x
));
5263 "bit-field `%s' width not an integer constant");
5264 DECL_INITIAL (x
) = NULL
;
5268 /* Detect invalid bit-field type. */
5269 if (DECL_INITIAL (x
)
5270 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5271 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5273 error_with_decl (x
, "bit-field `%s' has invalid type");
5274 DECL_INITIAL (x
) = NULL
;
5277 if (DECL_INITIAL (x
) && pedantic
5278 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5279 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5280 /* Accept an enum that's equivalent to int or unsigned int. */
5281 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5282 && (TYPE_PRECISION (TREE_TYPE (x
))
5283 == TYPE_PRECISION (integer_type_node
))))
5284 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5286 /* Detect and ignore out of range field width and process valid
5288 if (DECL_INITIAL (x
))
5290 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5291 error_with_decl (x
, "negative width in bit-field `%s'");
5292 else if (0 < compare_tree_int (DECL_INITIAL (x
),
5293 TYPE_PRECISION (TREE_TYPE (x
))))
5294 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5295 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5296 error_with_decl (x
, "zero width for bit-field `%s'");
5299 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5300 unsigned HOST_WIDE_INT width
5301 = TREE_INT_CST_LOW (DECL_INITIAL (x
));
5303 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5304 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5305 TREE_UNSIGNED (TREE_TYPE (x
)))
5307 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5308 TREE_UNSIGNED (TREE_TYPE (x
))))))
5309 warning_with_decl (x
,
5310 "`%s' is narrower than values of its type");
5312 DECL_SIZE (x
) = bitsize_int (width
);
5313 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5317 /* field size 0 => force desired amount of alignment. */
5318 #ifdef EMPTY_FIELD_BOUNDARY
5319 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5321 #ifdef PCC_BITFIELD_TYPE_MATTERS
5322 if (PCC_BITFIELD_TYPE_MATTERS
)
5323 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5324 TYPE_ALIGN (TREE_TYPE (x
)));
5330 else if (TREE_TYPE (x
) != error_mark_node
)
5332 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5333 : TYPE_ALIGN (TREE_TYPE (x
)));
5335 /* Non-bit-fields are aligned for their type, except packed
5336 fields which require only BITS_PER_UNIT alignment. */
5337 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5340 DECL_INITIAL (x
) = 0;
5343 /* Delete all duplicate fields from the fieldlist */
5344 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5345 /* Anonymous fields aren't duplicates. */
5346 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5350 register tree y
= fieldlist
;
5354 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5360 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5362 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5363 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5365 else x
= TREE_CHAIN (x
);
5368 /* Now we have the nearly final fieldlist. Record it,
5369 then lay out the structure or union (including the fields). */
5371 TYPE_FIELDS (t
) = fieldlist
;
5375 /* Delete all zero-width bit-fields from the fieldlist */
5377 tree
*fieldlistp
= &fieldlist
;
5379 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5380 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5382 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5385 /* Now we have the truly final field list.
5386 Store it in this type and in the variants. */
5388 TYPE_FIELDS (t
) = fieldlist
;
5390 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5392 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5393 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5394 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5397 /* If this was supposed to be a transparent union, but we can't
5398 make it one, warn and turn off the flag. */
5399 if (TREE_CODE (t
) == UNION_TYPE
5400 && TYPE_TRANSPARENT_UNION (t
)
5401 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5403 TYPE_TRANSPARENT_UNION (t
) = 0;
5404 warning ("union cannot be made transparent");
5407 /* If this structure or union completes the type of any previous
5408 variable declaration, lay it out and output its rtl. */
5410 if (current_binding_level
->n_incomplete
!= 0)
5413 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5415 if (TREE_TYPE (decl
) == t
5416 && TREE_CODE (decl
) != TYPE_DECL
)
5418 layout_decl (decl
, 0);
5419 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5420 maybe_objc_check_decl (decl
);
5421 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5424 --current_binding_level
->n_incomplete
;
5426 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5427 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5429 tree element
= TREE_TYPE (decl
);
5430 while (TREE_CODE (element
) == ARRAY_TYPE
)
5431 element
= TREE_TYPE (element
);
5433 layout_array_type (TREE_TYPE (decl
));
5438 /* Finish debugging output for this type. */
5439 rest_of_type_compilation (t
, toplevel
);
5444 /* Lay out the type T, and its element type, and so on. */
5447 layout_array_type (t
)
5450 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5451 layout_array_type (TREE_TYPE (t
));
5455 /* Begin compiling the definition of an enumeration type.
5456 NAME is its name (or null if anonymous).
5457 Returns the type object, as yet incomplete.
5458 Also records info about it so that build_enumerator
5459 may be used to declare the individual values as they are read. */
5465 register tree enumtype
= 0;
5467 /* If this is the real definition for a previous forward reference,
5468 fill in the contents in the same object that used to be the
5469 forward reference. */
5472 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5474 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5476 enumtype
= make_node (ENUMERAL_TYPE
);
5477 pushtag (name
, enumtype
);
5480 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5482 if (TYPE_VALUES (enumtype
) != 0)
5484 /* This enum is a named one that has been declared already. */
5485 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5487 /* Completely replace its old definition.
5488 The old enumerators remain defined, however. */
5489 TYPE_VALUES (enumtype
) = 0;
5492 enum_next_value
= integer_zero_node
;
5495 if (flag_short_enums
)
5496 TYPE_PACKED (enumtype
) = 1;
5501 /* After processing and defining all the values of an enumeration type,
5502 install their decls in the enumeration type and finish it off.
5503 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5504 and ATTRIBUTES are the specified attributes.
5505 Returns ENUMTYPE. */
5508 finish_enum (enumtype
, values
, attributes
)
5513 register tree pair
, tem
;
5514 tree minnode
= 0, maxnode
= 0;
5515 int precision
, unsign
;
5516 int toplevel
= (global_binding_level
== current_binding_level
);
5518 if (in_parm_level_p ())
5519 warning ("enum defined inside parms");
5521 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5523 /* Calculate the maximum value of any enumerator in this type. */
5525 if (values
== error_mark_node
)
5526 minnode
= maxnode
= integer_zero_node
;
5529 minnode
= maxnode
= TREE_VALUE (values
);
5530 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5532 tree value
= TREE_VALUE (pair
);
5533 if (tree_int_cst_lt (maxnode
, value
))
5535 if (tree_int_cst_lt (value
, minnode
))
5540 /* Construct the final type of this enumeration. It is the same
5541 as one of the integral types - the narrowest one that fits, except
5542 that normally we only go as narrow as int - and signed iff any of
5543 the values are negative. */
5544 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5545 precision
= MAX (min_precision (minnode
, unsign
),
5546 min_precision (maxnode
, unsign
));
5547 if (!TYPE_PACKED (enumtype
))
5548 precision
= MAX (precision
, TYPE_PRECISION (integer_type_node
));
5549 if (type_for_size (precision
, unsign
) == 0)
5551 warning ("enumeration values exceed range of largest integer");
5552 precision
= TYPE_PRECISION (long_long_integer_type_node
);
5555 TYPE_MIN_VALUE (enumtype
) = minnode
;
5556 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5557 TYPE_PRECISION (enumtype
) = precision
;
5558 TREE_UNSIGNED (enumtype
) = unsign
;
5559 TYPE_SIZE (enumtype
) = 0;
5560 layout_type (enumtype
);
5562 if (values
!= error_mark_node
)
5564 /* Change the type of the enumerators to be the enum type. We
5565 need to do this irrespective of the size of the enum, for
5566 proper type checking. Replace the DECL_INITIALs of the
5567 enumerators, and the value slots of the list, with copies
5568 that have the enum type; they cannot be modified in place
5569 because they may be shared (e.g. integer_zero_node) Finally,
5570 change the purpose slots to point to the names of the decls. */
5571 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5573 tree enu
= TREE_PURPOSE (pair
);
5575 TREE_TYPE (enu
) = enumtype
;
5576 DECL_SIZE (enu
) = TYPE_SIZE (enumtype
);
5577 DECL_SIZE_UNIT (enu
) = TYPE_SIZE_UNIT (enumtype
);
5578 DECL_ALIGN (enu
) = TYPE_ALIGN (enumtype
);
5579 DECL_MODE (enu
) = TYPE_MODE (enumtype
);
5580 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5582 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5583 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5586 TYPE_VALUES (enumtype
) = values
;
5589 /* Fix up all variant types of this enum type. */
5590 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5592 if (tem
== enumtype
)
5594 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5595 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5596 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5597 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5598 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5599 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5600 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5601 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5602 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5605 /* Finish debugging output for this type. */
5606 rest_of_type_compilation (enumtype
, toplevel
);
5611 /* Build and install a CONST_DECL for one value of the
5612 current enumeration type (one that was begun with start_enum).
5613 Return a tree-list containing the CONST_DECL and its value.
5614 Assignment of sequential values by default is handled here. */
5617 build_enumerator (name
, value
)
5620 register tree decl
, type
;
5622 /* Validate and default VALUE. */
5624 /* Remove no-op casts from the value. */
5626 STRIP_TYPE_NOPS (value
);
5630 if (TREE_CODE (value
) == INTEGER_CST
)
5632 value
= default_conversion (value
);
5633 constant_expression_warning (value
);
5637 error ("enumerator value for `%s' not integer constant",
5638 IDENTIFIER_POINTER (name
));
5643 /* Default based on previous value. */
5644 /* It should no longer be possible to have NON_LVALUE_EXPR
5648 value
= enum_next_value
;
5650 error ("overflow in enumeration values");
5653 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5655 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5656 value
= integer_zero_node
;
5659 /* Set basis for default for next value. */
5660 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5661 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5663 /* Now create a declaration for the enum value name. */
5665 type
= TREE_TYPE (value
);
5666 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5667 TYPE_PRECISION (integer_type_node
)),
5669 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5670 && TREE_UNSIGNED (type
)));
5672 decl
= build_decl (CONST_DECL
, name
, type
);
5673 DECL_INITIAL (decl
) = convert (type
, value
);
5676 return tree_cons (decl
, value
, NULL_TREE
);
5679 /* Create the FUNCTION_DECL for a function definition.
5680 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5681 the declaration; they describe the function's name and the type it returns,
5682 but twisted together in a fashion that parallels the syntax of C.
5684 This function creates a binding context for the function body
5685 as well as setting up the FUNCTION_DECL in current_function_decl.
5687 Returns 1 on success. If the DECLARATOR is not suitable for a function
5688 (it defines a datum instead), we return 0, which tells
5689 yyparse to report a parse error. */
5692 start_function (declspecs
, declarator
, prefix_attributes
, attributes
)
5693 tree declarator
, declspecs
, prefix_attributes
, attributes
;
5695 tree decl1
, old_decl
;
5697 int old_immediate_size_expand
= immediate_size_expand
;
5699 current_function_returns_value
= 0; /* Assume, until we see it does. */
5700 current_function_returns_null
= 0;
5701 warn_about_return_type
= 0;
5702 current_extern_inline
= 0;
5703 c_function_varargs
= 0;
5705 shadowed_labels
= 0;
5707 /* Don't expand any sizes in the return type of the function. */
5708 immediate_size_expand
= 0;
5710 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5712 /* If the declarator is not suitable for a function definition,
5713 cause a syntax error. */
5716 immediate_size_expand
= old_immediate_size_expand
;
5720 decl_attributes (decl1
, prefix_attributes
, attributes
);
5722 announce_function (decl1
);
5724 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5726 error ("return-type is an incomplete type");
5727 /* Make it return void instead. */
5729 = build_function_type (void_type_node
,
5730 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5733 if (warn_about_return_type
)
5734 warning ("return-type defaults to `int'");
5736 /* Save the parm names or decls from this function's declarator
5737 where store_parm_decls will find them. */
5738 current_function_parms
= last_function_parms
;
5739 current_function_parm_tags
= last_function_parm_tags
;
5741 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5742 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5743 DECL_INITIAL (decl1
) = error_mark_node
;
5745 /* If this definition isn't a prototype and we had a prototype declaration
5746 before, copy the arg type info from that prototype.
5747 But not if what we had before was a builtin function. */
5748 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5749 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5750 && !DECL_BUILT_IN (old_decl
)
5751 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5752 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5753 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5755 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5756 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
5757 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
5760 /* If there is no explicit declaration, look for any out-of-scope implicit
5763 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
5765 /* Optionally warn of old-fashioned def with no previous prototype. */
5766 if (warn_strict_prototypes
5767 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5768 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5769 warning ("function declaration isn't a prototype");
5770 /* Optionally warn of any global def with no previous prototype. */
5771 else if (warn_missing_prototypes
5772 && TREE_PUBLIC (decl1
)
5773 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
5774 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5775 warning_with_decl (decl1
, "no previous prototype for `%s'");
5776 /* Optionally warn of any def with no previous prototype
5777 if the function has already been used. */
5778 else if (warn_missing_prototypes
5779 && old_decl
!= 0 && TREE_USED (old_decl
)
5780 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5781 warning_with_decl (decl1
,
5782 "`%s' was used with no prototype before its definition");
5783 /* Optionally warn of any global def with no previous declaration. */
5784 else if (warn_missing_declarations
5785 && TREE_PUBLIC (decl1
)
5787 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5788 warning_with_decl (decl1
, "no previous declaration for `%s'");
5789 /* Optionally warn of any def with no previous declaration
5790 if the function has already been used. */
5791 else if (warn_missing_declarations
5792 && old_decl
!= 0 && TREE_USED (old_decl
)
5793 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
5794 warning_with_decl (decl1
,
5795 "`%s' was used with no declaration before its definition");
5797 /* This is a definition, not a reference.
5798 So normally clear DECL_EXTERNAL.
5799 However, `extern inline' acts like a declaration
5800 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5801 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5803 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5804 SET_DEFAULT_DECL_ATTRIBUTES (decl1
, attributes
);
5807 /* This function exists in static storage.
5808 (This does not mean `static' in the C sense!) */
5809 TREE_STATIC (decl1
) = 1;
5811 /* A nested function is not global. */
5812 if (current_function_decl
!= 0)
5813 TREE_PUBLIC (decl1
) = 0;
5815 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5817 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
5822 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5823 != integer_type_node
)
5824 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
5826 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5827 args
= TREE_CHAIN (args
))
5829 tree type
= args
? TREE_VALUE (args
) : 0;
5831 if (type
== void_type_node
)
5838 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5839 pedwarn_with_decl (decl1
,
5840 "first argument of `%s' should be `int'");
5844 if (TREE_CODE (type
) != POINTER_TYPE
5845 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5846 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5848 pedwarn_with_decl (decl1
,
5849 "second argument of `%s' should be `char **'");
5853 if (TREE_CODE (type
) != POINTER_TYPE
5854 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5855 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5857 pedwarn_with_decl (decl1
,
5858 "third argument of `%s' should probably be `char **'");
5863 /* It is intentional that this message does not mention the third
5864 argument, which is warned for only pedantically, because it's
5865 blessed by mention in an appendix of the standard. */
5866 if (argct
> 0 && (argct
< 2 || argct
> 3))
5867 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
5869 if (argct
== 3 && pedantic
)
5870 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
5872 if (! TREE_PUBLIC (decl1
))
5873 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
5876 /* Record the decl so that the function name is defined.
5877 If we already have a decl for this name, and it is a FUNCTION_DECL,
5878 use the old decl. */
5880 current_function_decl
= pushdecl (decl1
);
5883 declare_parm_level (1);
5884 current_binding_level
->subblocks_tag_transparent
= 1;
5886 make_function_rtl (current_function_decl
);
5888 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5889 /* Promote the value to int before returning it. */
5890 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
5892 /* It retains unsignedness if traditional
5893 or if not really getting wider. */
5894 if (TREE_UNSIGNED (restype
)
5895 && (flag_traditional
5896 || (TYPE_PRECISION (restype
)
5897 == TYPE_PRECISION (integer_type_node
))))
5898 restype
= unsigned_type_node
;
5900 restype
= integer_type_node
;
5902 DECL_RESULT (current_function_decl
)
5903 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5905 /* If this fcn was already referenced via a block-scope `extern' decl
5906 (or an implicit decl), propagate certain information about the usage. */
5907 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5908 TREE_ADDRESSABLE (current_function_decl
) = 1;
5910 immediate_size_expand
= old_immediate_size_expand
;
5915 /* Record that this function is going to be a varargs function.
5916 This is called before store_parm_decls, which is too early
5917 to call mark_varargs directly. */
5922 c_function_varargs
= 1;
5925 /* Store the parameter declarations into the current function declaration.
5926 This is called after parsing the parameter declarations, before
5927 digesting the body of the function.
5929 For an old-style definition, modify the function's type
5930 to specify at least the number of arguments. */
5935 register tree fndecl
= current_function_decl
;
5938 /* This is either a chain of PARM_DECLs (if a prototype was used)
5939 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5940 tree specparms
= current_function_parms
;
5942 /* This is a list of types declared among parms in a prototype. */
5943 tree parmtags
= current_function_parm_tags
;
5945 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5946 register tree parmdecls
= getdecls ();
5948 /* This is a chain of any other decls that came in among the parm
5949 declarations. If a parm is declared with enum {foo, bar} x;
5950 then CONST_DECLs for foo and bar are put here. */
5953 /* Nonzero if this definition is written with a prototype. */
5956 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
5958 /* This case is when the function was defined with an ANSI prototype.
5959 The parms already have decls, so we need not do anything here
5960 except record them as in effect
5961 and complain if any redundant old-style parm decls were written. */
5972 error_with_decl (fndecl
,
5973 "parm types given both in parmlist and separately");
5974 /* Get rid of the erroneous decls; don't keep them on
5975 the list of parms, since they might not be PARM_DECLs. */
5976 for (decl
= current_binding_level
->names
;
5977 decl
; decl
= TREE_CHAIN (decl
))
5978 if (DECL_NAME (decl
))
5979 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
5980 for (link
= current_binding_level
->shadowed
;
5981 link
; link
= TREE_CHAIN (link
))
5982 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
5983 current_binding_level
->names
= 0;
5984 current_binding_level
->shadowed
= 0;
5987 specparms
= nreverse (specparms
);
5988 for (parm
= specparms
; parm
; parm
= next
)
5990 next
= TREE_CHAIN (parm
);
5991 if (TREE_CODE (parm
) == PARM_DECL
)
5993 if (DECL_NAME (parm
) == 0)
5994 error_with_decl (parm
, "parameter name omitted");
5995 else if (TREE_CODE (TREE_TYPE (parm
)) != ERROR_MARK
5996 && VOID_TYPE_P (TREE_TYPE (parm
)))
5998 error_with_decl (parm
, "parameter `%s' declared void");
5999 /* Change the type to error_mark_node so this parameter
6000 will be ignored by assign_parms. */
6001 TREE_TYPE (parm
) = error_mark_node
;
6007 /* If we find an enum constant or a type tag,
6008 put it aside for the moment. */
6009 TREE_CHAIN (parm
) = 0;
6010 others
= chainon (others
, parm
);
6014 /* Get the decls in their original chain order
6015 and record in the function. */
6016 DECL_ARGUMENTS (fndecl
) = getdecls ();
6019 /* If this function takes a variable number of arguments,
6020 add a phony parameter to the end of the parm list,
6021 to represent the position of the first unnamed argument. */
6022 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6025 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6026 /* Let's hope the address of the unnamed parm
6027 won't depend on its type. */
6028 TREE_TYPE (dummy
) = integer_type_node
;
6029 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6030 DECL_ARGUMENTS (fndecl
)
6031 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6035 /* Now pushdecl the enum constants. */
6036 for (parm
= others
; parm
; parm
= next
)
6038 next
= TREE_CHAIN (parm
);
6039 if (DECL_NAME (parm
) == 0)
6041 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6043 else if (TREE_CODE (parm
) != PARM_DECL
)
6047 storetags (chainon (parmtags
, gettags ()));
6051 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6052 each with a parm name as the TREE_VALUE.
6054 PARMDECLS is a chain of declarations for parameters.
6055 Warning! It can also contain CONST_DECLs which are not parameters
6056 but are names of enumerators of any enum types
6057 declared among the parameters.
6059 First match each formal parameter name with its declaration.
6060 Associate decls with the names and store the decls
6061 into the TREE_PURPOSE slots. */
6063 /* We use DECL_WEAK as a flag to show which parameters have been
6064 seen already since it is not used on PARM_DECL or CONST_DECL. */
6065 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6066 DECL_WEAK (parm
) = 0;
6068 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6070 register tree tail
, found
= NULL
;
6072 if (TREE_VALUE (parm
) == 0)
6074 error_with_decl (fndecl
,
6075 "parameter name missing from parameter list");
6076 TREE_PURPOSE (parm
) = 0;
6080 /* See if any of the parmdecls specifies this parm by name.
6081 Ignore any enumerator decls. */
6082 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6083 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6084 && TREE_CODE (tail
) == PARM_DECL
)
6090 /* If declaration already marked, we have a duplicate name.
6091 Complain, and don't use this decl twice. */
6092 if (found
&& DECL_WEAK (found
))
6094 error_with_decl (found
, "multiple parameters named `%s'");
6098 /* If the declaration says "void", complain and ignore it. */
6099 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6101 error_with_decl (found
, "parameter `%s' declared void");
6102 TREE_TYPE (found
) = integer_type_node
;
6103 DECL_ARG_TYPE (found
) = integer_type_node
;
6104 layout_decl (found
, 0);
6107 /* Traditionally, a parm declared float is actually a double. */
6108 if (found
&& flag_traditional
6109 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6111 TREE_TYPE (found
) = double_type_node
;
6112 DECL_ARG_TYPE (found
) = double_type_node
;
6113 layout_decl (found
, 0);
6116 /* If no declaration found, default to int. */
6119 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6121 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6122 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6123 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6125 warning_with_decl (found
, "type of `%s' defaults to `int'");
6129 TREE_PURPOSE (parm
) = found
;
6131 /* Mark this decl as "already found" */
6132 DECL_WEAK (found
) = 1;
6135 /* Put anything which is on the parmdecls chain and which is
6136 not a PARM_DECL onto the list NONPARMS. (The types of
6137 non-parm things which might appear on the list include
6138 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6139 any actual PARM_DECLs not matched with any names. */
6142 for (parm
= parmdecls
; parm
; )
6144 tree next
= TREE_CHAIN (parm
);
6145 TREE_CHAIN (parm
) = 0;
6147 if (TREE_CODE (parm
) != PARM_DECL
)
6148 nonparms
= chainon (nonparms
, parm
);
6151 /* Complain about args with incomplete types. */
6152 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6154 error_with_decl (parm
, "parameter `%s' has incomplete type");
6155 TREE_TYPE (parm
) = error_mark_node
;
6158 if (! DECL_WEAK (parm
))
6160 error_with_decl (parm
,
6161 "declaration for parameter `%s' but no such parameter");
6162 /* Pretend the parameter was not missing.
6163 This gets us to a standard state and minimizes
6164 further error messages. */
6166 = chainon (specparms
,
6167 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6174 /* Chain the declarations together in the order of the list of names. */
6175 /* Store that chain in the function decl, replacing the list of names. */
6177 DECL_ARGUMENTS (fndecl
) = 0;
6180 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6181 if (TREE_PURPOSE (parm
))
6184 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6186 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6187 last
= TREE_PURPOSE (parm
);
6188 TREE_CHAIN (last
) = 0;
6192 /* If there was a previous prototype,
6193 set the DECL_ARG_TYPE of each argument according to
6194 the type previously specified, and report any mismatches. */
6196 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6199 for (parm
= DECL_ARGUMENTS (fndecl
),
6200 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6201 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6202 != void_type_node
));
6203 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6205 if (parm
== 0 || type
== 0
6206 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6208 error ("number of arguments doesn't match prototype");
6209 error_with_file_and_line (current_function_prototype_file
,
6210 current_function_prototype_line
,
6211 "prototype declaration");
6214 /* Type for passing arg must be consistent
6215 with that declared for the arg. */
6216 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6218 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6219 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6221 /* Adjust argument to match prototype. E.g. a previous
6222 `int foo(float);' prototype causes
6223 `int foo(x) float x; {...}' to be treated like
6224 `int foo(float x) {...}'. This is particularly
6225 useful for argument types like uid_t. */
6226 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6228 if (PROMOTE_PROTOTYPES
6229 && (TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6230 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6231 && TYPE_PRECISION (TREE_TYPE (parm
))
6232 < TYPE_PRECISION (integer_type_node
))
6233 DECL_ARG_TYPE (parm
) = integer_type_node
;
6237 pedwarn ("promoted argument `%s' doesn't match prototype",
6238 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6239 warning_with_file_and_line
6240 (current_function_prototype_file
,
6241 current_function_prototype_line
,
6242 "prototype declaration");
6245 /* If -traditional, allow `int' argument to match
6246 `unsigned' prototype. */
6247 else if (! (flag_traditional
6248 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6249 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6251 error ("argument `%s' doesn't match prototype",
6252 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6253 error_with_file_and_line (current_function_prototype_file
,
6254 current_function_prototype_line
,
6255 "prototype declaration");
6259 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6262 /* Otherwise, create a prototype that would match. */
6266 tree actual
= 0, last
= 0, type
;
6268 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6270 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6272 TREE_CHAIN (last
) = type
;
6277 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6279 TREE_CHAIN (last
) = type
;
6283 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6284 of the type of this function, but we need to avoid having this
6285 affect the types of other similarly-typed functions, so we must
6286 first force the generation of an identical (but separate) type
6287 node for the relevant function type. The new node we create
6288 will be a variant of the main variant of the original function
6291 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6293 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6296 /* Now store the final chain of decls for the arguments
6297 as the decl-chain of the current lexical scope.
6298 Put the enumerators in as well, at the front so that
6299 DECL_ARGUMENTS is not modified. */
6301 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6304 /* Make sure the binding level for the top of the function body
6305 gets a BLOCK if there are any in the function.
6306 Otherwise, the dbx output is wrong. */
6308 keep_next_if_subblocks
= 1;
6310 /* ??? This might be an improvement,
6311 but needs to be thought about some more. */
6313 keep_next_level_flag
= 1;
6316 /* Write a record describing this function definition to the prototypes
6317 file (if requested). */
6319 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6321 /* Initialize the RTL code for the function. */
6323 init_function_start (fndecl
, input_filename
, lineno
);
6325 /* If this is a varargs function, inform function.c. */
6327 if (c_function_varargs
)
6330 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6332 declare_function_name ();
6334 /* Set up parameters and prepare for return, for the function. */
6336 expand_function_start (fndecl
, 0);
6338 /* If this function is `main', emit a call to `__main'
6339 to run global initializers, etc. */
6340 if (DECL_NAME (fndecl
)
6341 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6342 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6343 expand_main_function ();
6346 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6347 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6348 stands for an ellipsis in the identifier list.
6350 PARMLIST is the data returned by get_parm_info for the
6351 parmlist that follows the semicolon.
6353 We return a value of the same sort that get_parm_info returns,
6354 except that it describes the combination of identifiers and parmlist. */
6357 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6358 tree specparms
, parmlist
;
6361 register tree fndecl
= current_function_decl
;
6364 tree parmdecls
= TREE_PURPOSE (parmlist
);
6366 /* This is a chain of any other decls that came in among the parm
6367 declarations. They were separated already by get_parm_info,
6368 so we just need to keep them separate. */
6369 tree nonparms
= TREE_VALUE (parmlist
);
6373 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6374 DECL_WEAK (parm
) = 0;
6376 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6378 register tree tail
, found
= NULL
;
6380 /* See if any of the parmdecls specifies this parm by name. */
6381 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6382 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6388 /* If declaration already marked, we have a duplicate name.
6389 Complain, and don't use this decl twice. */
6390 if (found
&& DECL_WEAK (found
))
6392 error_with_decl (found
, "multiple parameters named `%s'");
6396 /* If the declaration says "void", complain and ignore it. */
6397 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6399 error_with_decl (found
, "parameter `%s' declared void");
6400 TREE_TYPE (found
) = integer_type_node
;
6401 DECL_ARG_TYPE (found
) = integer_type_node
;
6402 layout_decl (found
, 0);
6405 /* Traditionally, a parm declared float is actually a double. */
6406 if (found
&& flag_traditional
6407 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6409 TREE_TYPE (found
) = double_type_node
;
6410 DECL_ARG_TYPE (found
) = double_type_node
;
6411 layout_decl (found
, 0);
6414 /* If no declaration found, default to int. */
6417 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6419 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6420 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6421 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6422 error_with_decl (found
, "type of parameter `%s' is not declared");
6426 TREE_PURPOSE (parm
) = found
;
6428 /* Mark this decl as "already found". */
6429 DECL_WEAK (found
) = 1;
6432 /* Complain about any actual PARM_DECLs not matched with any names. */
6434 for (parm
= parmdecls
; parm
; )
6436 tree next
= TREE_CHAIN (parm
);
6437 TREE_CHAIN (parm
) = 0;
6439 /* Complain about args with incomplete types. */
6440 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6442 error_with_decl (parm
, "parameter `%s' has incomplete type");
6443 TREE_TYPE (parm
) = error_mark_node
;
6446 if (! DECL_WEAK (parm
))
6448 error_with_decl (parm
,
6449 "declaration for parameter `%s' but no such parameter");
6450 /* Pretend the parameter was not missing.
6451 This gets us to a standard state and minimizes
6452 further error messages. */
6454 = chainon (specparms
,
6455 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6461 /* Chain the declarations together in the order of the list of names.
6462 At the same time, build up a list of their types, in reverse order. */
6468 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6469 if (TREE_PURPOSE (parm
))
6472 parmdecls
= TREE_PURPOSE (parm
);
6474 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6475 last
= TREE_PURPOSE (parm
);
6476 TREE_CHAIN (last
) = 0;
6478 types
= tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6483 return tree_cons (parmdecls
, nonparms
,
6484 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
6486 return tree_cons (parmdecls
, nonparms
, nreverse (types
));
6489 /* Finish up a function declaration and compile that function
6490 all the way to assembler language output. The free the storage
6491 for the function definition.
6493 This is called after parsing the body of the function definition.
6495 NESTED is nonzero if the function being finished is nested in another. */
6498 finish_function (nested
)
6501 register tree fndecl
= current_function_decl
;
6503 /* TREE_READONLY (fndecl) = 1;
6504 This caused &foo to be of type ptr-to-const-function
6505 which then got a warning when stored in a ptr-to-function variable. */
6508 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6510 /* Must mark the RESULT_DECL as being in this function. */
6512 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6514 /* Obey `register' declarations if `setjmp' is called in this fn. */
6515 if (flag_traditional
&& current_function_calls_setjmp
)
6517 setjmp_protect (DECL_INITIAL (fndecl
));
6518 setjmp_protect_args ();
6521 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6523 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6524 != integer_type_node
)
6526 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6527 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6529 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6533 #ifdef DEFAULT_MAIN_RETURN
6534 /* Make it so that `main' always returns success by default. */
6535 DEFAULT_MAIN_RETURN
;
6540 /* Generate rtl for function exit. */
6541 expand_function_end (input_filename
, lineno
, 0);
6543 /* So we can tell if jump_optimize sets it to 1. */
6546 /* If this is a nested function, protect the local variables in the stack
6547 above us from being collected while we're compiling this function. */
6549 ggc_push_context ();
6551 /* Run the optimizers and output the assembler code for this function. */
6552 rest_of_compilation (fndecl
);
6554 /* Undo the GC context switch. */
6558 current_function_returns_null
|= can_reach_end
;
6560 if (warn_missing_noreturn
6561 && !TREE_THIS_VOLATILE (fndecl
)
6562 && !current_function_returns_null
6563 && !current_function_returns_value
)
6564 warning ("function might be possible candidate for attribute `noreturn'");
6566 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6567 warning ("`noreturn' function does return");
6568 else if (warn_return_type
&& can_reach_end
6569 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl
))))
6570 /* If this function returns non-void and control can drop through,
6572 warning ("control reaches end of non-void function");
6573 /* With just -W, complain only if function returns both with
6574 and without a value. */
6575 else if (extra_warnings
6576 && current_function_returns_value
&& current_function_returns_null
)
6577 warning ("this function may return with or without a value");
6579 /* If requested, warn about function definitions where the function will
6580 return a value (usually of some struct or union type) which itself will
6581 take up a lot of stack space. */
6583 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6585 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6587 if (ret_type
&& TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
6588 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
6591 unsigned int size_as_int
6592 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
6594 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
6595 warning_with_decl (fndecl
,
6596 "size of return value of `%s' is %u bytes",
6599 warning_with_decl (fndecl
,
6600 "size of return value of `%s' is larger than %d bytes",
6605 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6607 /* Stop pointing to the local nodes about to be freed.
6608 But DECL_INITIAL must remain nonzero so we know this
6609 was an actual function definition.
6610 For a nested function, this is done in pop_c_function_context.
6611 If rest_of_compilation set this to 0, leave it 0. */
6612 if (DECL_INITIAL (fndecl
) != 0)
6613 DECL_INITIAL (fndecl
) = error_mark_node
;
6615 DECL_ARGUMENTS (fndecl
) = 0;
6618 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6620 #ifndef ASM_OUTPUT_CONSTRUCTOR
6621 if (! flag_gnu_linker
)
6622 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6625 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6628 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6630 #ifndef ASM_OUTPUT_DESTRUCTOR
6631 if (! flag_gnu_linker
)
6632 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6635 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6640 /* Let the error reporting routines know that we're outside a
6641 function. For a nested function, this value is used in
6642 pop_c_function_context and then reset via pop_function_context. */
6643 current_function_decl
= NULL
;
6647 /* Save and restore the variables in this file and elsewhere
6648 that keep track of the progress of compilation of the current function.
6649 Used for nested functions. */
6651 struct language_function
6654 tree shadowed_labels
;
6657 int warn_about_return_type
;
6659 struct binding_level
*binding_level
;
6662 /* Save and reinitialize the variables
6663 used during compilation of a C function. */
6666 push_c_function_context (f
)
6669 struct language_function
*p
;
6670 p
= (struct language_function
*) xmalloc (sizeof (struct language_function
));
6673 p
->named_labels
= named_labels
;
6674 p
->shadowed_labels
= shadowed_labels
;
6675 p
->returns_value
= current_function_returns_value
;
6676 p
->returns_null
= current_function_returns_null
;
6677 p
->warn_about_return_type
= warn_about_return_type
;
6678 p
->extern_inline
= current_extern_inline
;
6679 p
->binding_level
= current_binding_level
;
6682 /* Restore the variables used during compilation of a C function. */
6685 pop_c_function_context (f
)
6688 struct language_function
*p
= f
->language
;
6691 /* Bring back all the labels that were shadowed. */
6692 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
6693 if (DECL_NAME (TREE_VALUE (link
)) != 0)
6694 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
6695 = TREE_VALUE (link
);
6697 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
6699 /* Stop pointing to the local nodes about to be freed. */
6700 /* But DECL_INITIAL must remain nonzero so we know this
6701 was an actual function definition. */
6702 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6703 DECL_ARGUMENTS (current_function_decl
) = 0;
6706 named_labels
= p
->named_labels
;
6707 shadowed_labels
= p
->shadowed_labels
;
6708 current_function_returns_value
= p
->returns_value
;
6709 current_function_returns_null
= p
->returns_null
;
6710 warn_about_return_type
= p
->warn_about_return_type
;
6711 current_extern_inline
= p
->extern_inline
;
6712 current_binding_level
= p
->binding_level
;
6718 /* Mark the language specific parts of F for GC. */
6720 mark_c_function_context (f
)
6723 struct language_function
*p
= f
->language
;
6728 ggc_mark_tree (p
->shadowed_labels
);
6729 ggc_mark_tree (p
->named_labels
);
6730 mark_binding_level (&p
->binding_level
);
6733 /* integrate_decl_tree calls this function, but since we don't use the
6734 DECL_LANG_SPECIFIC field, this is a no-op. */
6737 copy_lang_decl (node
)
6738 tree node ATTRIBUTE_UNUSED
;
6742 /* Mark ARG for GC. */
6744 lang_mark_false_label_stack (arg
)
6745 struct label_node
*arg
;
6747 /* C doesn't use false_label_stack. It better be NULL. */
6752 /* Mark the language specific bits in T for GC. */
6757 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
6759 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
6760 ggc_mark_tree (i
->global_value
);
6761 ggc_mark_tree (i
->local_value
);
6762 ggc_mark_tree (i
->label_value
);
6763 ggc_mark_tree (i
->implicit_decl
);
6764 ggc_mark_tree (i
->error_locus
);
6765 ggc_mark_tree (i
->limbo_value
);
6767 else if (TYPE_P (t
) && TYPE_LANG_SPECIFIC (t
))
6768 ggc_mark (TYPE_LANG_SPECIFIC (t
));