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 /* The variant of the C language being processed. */
459 c_language_kind c_language
= clk_c
;
461 /* Nonzero means `$' can be in an identifier. */
463 #ifndef DOLLARS_IN_IDENTIFIERS
464 #define DOLLARS_IN_IDENTIFIERS 1
466 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
468 /* Decode the string P as a language-specific option for C.
469 Return the number of strings consumed. Should not complain
470 if it does not recognise the option. */
473 c_decode_option (argc
, argv
)
474 int argc ATTRIBUTE_UNUSED
;
477 int strings_processed
;
480 strings_processed
= cpp_handle_option (&parse_in
, argc
, argv
);
482 strings_processed
= 0;
483 #endif /* ! USE_CPPLIB */
485 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
487 flag_traditional
= 1;
488 flag_writable_strings
= 1;
490 else if (!strcmp (p
, "-fallow-single-precision"))
491 flag_allow_single_precision
= 1;
492 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
497 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
501 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
505 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
507 flag_traditional
= 0;
508 flag_writable_strings
= 0;
510 else if (!strncmp (p
, "-std=", 5))
512 /* Select the appropriate language standard. We currently
514 -std=iso9899:1990 same as -ansi
515 -std=iso9899:199409 ISO C as modified in amend. 1
516 -std=iso9899:1999 ISO C 99
517 -std=c89 same as -std=iso9899:1990
518 -std=c99 same as -std=iso9899:1999
519 -std=gnu89 default, iso9899:1990 + gnu extensions
520 -std=gnu99 iso9899:1999 + gnu extensions
522 const char *argstart
= &p
[5];
524 if (!strcmp (argstart
, "iso9899:1990")
525 || !strcmp (argstart
, "c89"))
528 flag_traditional
= 0;
529 flag_writable_strings
= 0;
531 flag_no_nonansi_builtin
= 1;
534 else if (!strcmp (argstart
, "iso9899:199409"))
536 /* ??? The changes since ISO C 1990 are not supported. */
539 else if (!strcmp (argstart
, "iso9899:199x")
540 || !strcmp (argstart
, "iso9899:1999")
541 || !strcmp (argstart
, "c9x")
542 || !strcmp (argstart
, "c99"))
544 flag_traditional
= 0;
545 flag_writable_strings
= 0;
547 flag_no_nonansi_builtin
= 1;
550 else if (!strcmp (argstart
, "gnu89"))
552 flag_traditional
= 0;
553 flag_writable_strings
= 0;
555 flag_no_nonansi_builtin
= 0;
558 else if (!strcmp (argstart
, "gnu9x") || !strcmp (argstart
, "gnu99"))
560 flag_traditional
= 0;
561 flag_writable_strings
= 0;
563 flag_no_nonansi_builtin
= 0;
567 error ("unknown C standard `%s'", argstart
);
569 else if (!strcmp (p
, "-fdollars-in-identifiers"))
570 dollars_in_ident
= 1;
571 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
572 dollars_in_ident
= 0;
573 else if (!strcmp (p
, "-fsigned-char"))
574 flag_signed_char
= 1;
575 else if (!strcmp (p
, "-funsigned-char"))
576 flag_signed_char
= 0;
577 else if (!strcmp (p
, "-fno-signed-char"))
578 flag_signed_char
= 0;
579 else if (!strcmp (p
, "-fno-unsigned-char"))
580 flag_signed_char
= 1;
581 else if (!strcmp (p
, "-fsigned-bitfields")
582 || !strcmp (p
, "-fno-unsigned-bitfields"))
584 flag_signed_bitfields
= 1;
585 explicit_flag_signed_bitfields
= 1;
587 else if (!strcmp (p
, "-funsigned-bitfields")
588 || !strcmp (p
, "-fno-signed-bitfields"))
590 flag_signed_bitfields
= 0;
591 explicit_flag_signed_bitfields
= 1;
593 else if (!strcmp (p
, "-fshort-enums"))
594 flag_short_enums
= 1;
595 else if (!strcmp (p
, "-fno-short-enums"))
596 flag_short_enums
= 0;
597 else if (!strcmp (p
, "-fshort-wchar"))
598 flag_short_wchar
= 1;
599 else if (!strcmp (p
, "-fno-short-wchar"))
600 flag_short_wchar
= 0;
601 else if (!strcmp (p
, "-fcond-mismatch"))
602 flag_cond_mismatch
= 1;
603 else if (!strcmp (p
, "-fno-cond-mismatch"))
604 flag_cond_mismatch
= 0;
605 else if (!strcmp (p
, "-fshort-double"))
606 flag_short_double
= 1;
607 else if (!strcmp (p
, "-fno-short-double"))
608 flag_short_double
= 0;
609 else if (!strcmp (p
, "-fasm"))
611 else if (!strcmp (p
, "-fno-asm"))
613 else if (!strcmp (p
, "-fbuiltin"))
615 else if (!strcmp (p
, "-fno-builtin"))
617 else if (!strcmp (p
, "-ansi"))
619 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
620 mesg_implicit_function_declaration
= 2;
621 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
622 mesg_implicit_function_declaration
= 1;
623 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
624 mesg_implicit_function_declaration
= 0;
625 else if (!strcmp (p
, "-Wimplicit-int"))
626 warn_implicit_int
= 1;
627 else if (!strcmp (p
, "-Wno-implicit-int"))
628 warn_implicit_int
= 0;
629 else if (!strcmp (p
, "-Wimplicit"))
631 warn_implicit_int
= 1;
632 if (mesg_implicit_function_declaration
!= 2)
633 mesg_implicit_function_declaration
= 1;
635 else if (!strcmp (p
, "-Wno-implicit"))
636 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
637 else if (!strcmp (p
, "-Wlong-long"))
639 else if (!strcmp (p
, "-Wno-long-long"))
641 else if (!strcmp (p
, "-Wwrite-strings"))
642 flag_const_strings
= 1;
643 else if (!strcmp (p
, "-Wno-write-strings"))
644 flag_const_strings
= 0;
645 else if (!strcmp (p
, "-Wcast-qual"))
647 else if (!strcmp (p
, "-Wno-cast-qual"))
649 else if (!strcmp (p
, "-Wbad-function-cast"))
650 warn_bad_function_cast
= 1;
651 else if (!strcmp (p
, "-Wno-bad-function-cast"))
652 warn_bad_function_cast
= 0;
653 else if (!strcmp (p
, "-Wmissing-noreturn"))
654 warn_missing_noreturn
= 1;
655 else if (!strcmp (p
, "-Wno-missing-noreturn"))
656 warn_missing_noreturn
= 0;
657 else if (!strcmp (p
, "-Wpointer-arith"))
658 warn_pointer_arith
= 1;
659 else if (!strcmp (p
, "-Wno-pointer-arith"))
660 warn_pointer_arith
= 0;
661 else if (!strcmp (p
, "-Wstrict-prototypes"))
662 warn_strict_prototypes
= 1;
663 else if (!strcmp (p
, "-Wno-strict-prototypes"))
664 warn_strict_prototypes
= 0;
665 else if (!strcmp (p
, "-Wmissing-prototypes"))
666 warn_missing_prototypes
= 1;
667 else if (!strcmp (p
, "-Wno-missing-prototypes"))
668 warn_missing_prototypes
= 0;
669 else if (!strcmp (p
, "-Wmissing-declarations"))
670 warn_missing_declarations
= 1;
671 else if (!strcmp (p
, "-Wno-missing-declarations"))
672 warn_missing_declarations
= 0;
673 else if (!strcmp (p
, "-Wredundant-decls"))
674 warn_redundant_decls
= 1;
675 else if (!strcmp (p
, "-Wno-redundant-decls"))
676 warn_redundant_decls
= 0;
677 else if (!strcmp (p
, "-Wnested-externs"))
678 warn_nested_externs
= 1;
679 else if (!strcmp (p
, "-Wno-nested-externs"))
680 warn_nested_externs
= 0;
681 else if (!strcmp (p
, "-Wtraditional"))
682 warn_traditional
= 1;
683 else if (!strcmp (p
, "-Wno-traditional"))
684 warn_traditional
= 0;
685 else if (!strncmp (p
, "-Wformat=", 9))
686 warn_format
= atol (p
+ 9);
687 else if (!strcmp (p
, "-Wformat"))
689 else if (!strcmp (p
, "-Wno-format"))
691 else if (!strcmp (p
, "-Wchar-subscripts"))
692 warn_char_subscripts
= 1;
693 else if (!strcmp (p
, "-Wno-char-subscripts"))
694 warn_char_subscripts
= 0;
695 else if (!strcmp (p
, "-Wconversion"))
697 else if (!strcmp (p
, "-Wno-conversion"))
699 else if (!strcmp (p
, "-Wparentheses"))
700 warn_parentheses
= 1;
701 else if (!strcmp (p
, "-Wno-parentheses"))
702 warn_parentheses
= 0;
703 else if (!strcmp (p
, "-Wreturn-type"))
704 warn_return_type
= 1;
705 else if (!strcmp (p
, "-Wno-return-type"))
706 warn_return_type
= 0;
707 else if (!strcmp (p
, "-Wcomment"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p
, "-Wno-comment"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p
, "-Wcomments"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p
, "-Wno-comments"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p
, "-Wtrigraphs"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p
, "-Wno-trigraphs"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p
, "-Wundef"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p
, "-Wno-undef"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p
, "-Wimport"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p
, "-Wno-import"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p
, "-Wmissing-braces"))
728 warn_missing_braces
= 1;
729 else if (!strcmp (p
, "-Wno-missing-braces"))
730 warn_missing_braces
= 0;
731 else if (!strcmp (p
, "-Wmain"))
733 else if (!strcmp (p
, "-Wno-main"))
735 else if (!strcmp (p
, "-Wsign-compare"))
736 warn_sign_compare
= 1;
737 else if (!strcmp (p
, "-Wno-sign-compare"))
738 warn_sign_compare
= 0;
739 else if (!strcmp (p
, "-Wfloat-equal"))
740 warn_float_equal
= 1;
741 else if (!strcmp (p
, "-Wno-float-equal"))
742 warn_float_equal
= 0;
743 else if (!strcmp (p
, "-Wmultichar"))
745 else if (!strcmp (p
, "-Wno-multichar"))
747 else if (!strcmp (p
, "-Wunknown-pragmas"))
748 /* Set to greater than 1, so that even unknown pragmas in system
749 headers will be warned about. */
750 warn_unknown_pragmas
= 2;
751 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
752 warn_unknown_pragmas
= 0;
753 else if (!strcmp (p
, "-Wall"))
755 /* We save the value of warn_uninitialized, since if they put
756 -Wuninitialized on the command line, we need to generate a
757 warning about not using it without also specifying -O. */
758 if (warn_uninitialized
!= 1)
759 warn_uninitialized
= 2;
760 warn_implicit_int
= 1;
761 mesg_implicit_function_declaration
= 1;
762 warn_return_type
= 1;
766 warn_char_subscripts
= 1;
767 warn_parentheses
= 1;
768 warn_missing_braces
= 1;
769 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
770 it off only if it's not explicit. */
772 /* Only warn about unknown pragmas that are not in system headers. */
773 warn_unknown_pragmas
= 1;
776 return strings_processed
;
781 /* Hooks for print_node. */
784 print_lang_decl (file
, node
, indent
)
785 FILE *file ATTRIBUTE_UNUSED
;
786 tree node ATTRIBUTE_UNUSED
;
787 int indent ATTRIBUTE_UNUSED
;
792 print_lang_type (file
, node
, indent
)
793 FILE *file ATTRIBUTE_UNUSED
;
794 tree node ATTRIBUTE_UNUSED
;
795 int indent ATTRIBUTE_UNUSED
;
800 print_lang_identifier (file
, node
, indent
)
805 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
806 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
807 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
808 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
809 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
810 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
813 /* Hook called at end of compilation to assume 1 elt
814 for a top-level array decl that wasn't complete before. */
817 finish_incomplete_decl (decl
)
820 if (TREE_CODE (decl
) == VAR_DECL
)
822 tree type
= TREE_TYPE (decl
);
823 if (type
!= error_mark_node
824 && TREE_CODE (type
) == ARRAY_TYPE
825 && TYPE_DOMAIN (type
) == 0)
827 if (! DECL_EXTERNAL (decl
))
828 warning_with_decl (decl
, "array `%s' assumed to have one element");
830 complete_array_type (type
, NULL_TREE
, 1);
832 layout_decl (decl
, 0);
837 /* Create a new `struct binding_level'. */
840 struct binding_level
*
841 make_binding_level ()
844 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
847 /* Nonzero if we are currently in the global binding level. */
852 return current_binding_level
== global_binding_level
;
858 keep_next_level_flag
= 1;
861 /* Nonzero if the current level needs to have a BLOCK made. */
866 return ((current_binding_level
->keep_if_subblocks
867 && current_binding_level
->blocks
!= 0)
868 || current_binding_level
->keep
869 || current_binding_level
->names
!= 0
870 || (current_binding_level
->tags
!= 0
871 && !current_binding_level
->tag_transparent
));
874 /* Identify this binding level as a level of parameters.
875 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
876 But it turns out there is no way to pass the right value for
877 DEFINITION_FLAG, so we ignore it. */
880 declare_parm_level (definition_flag
)
881 int definition_flag ATTRIBUTE_UNUSED
;
883 current_binding_level
->parm_flag
= 1;
886 /* Nonzero if currently making parm declarations. */
891 return current_binding_level
->parm_flag
;
894 /* Enter a new binding level.
895 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
896 not for that of tags. */
899 pushlevel (tag_transparent
)
902 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
904 /* If this is the top level of a function,
905 just make sure that NAMED_LABELS is 0. */
907 if (current_binding_level
== global_binding_level
)
912 /* Reuse or create a struct for this binding level. */
914 if (free_binding_level
)
916 newlevel
= free_binding_level
;
917 free_binding_level
= free_binding_level
->level_chain
;
921 newlevel
= make_binding_level ();
924 /* Add this level to the front of the chain (stack) of levels that
927 *newlevel
= clear_binding_level
;
928 newlevel
->tag_transparent
930 || (current_binding_level
931 ? current_binding_level
->subblocks_tag_transparent
933 newlevel
->level_chain
= current_binding_level
;
934 current_binding_level
= newlevel
;
935 newlevel
->keep
= keep_next_level_flag
;
936 keep_next_level_flag
= 0;
937 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
938 keep_next_if_subblocks
= 0;
941 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
944 clear_limbo_values (block
)
949 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
950 if (DECL_NAME (tem
) != 0)
951 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
953 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
954 clear_limbo_values (tem
);
957 /* Exit a binding level.
958 Pop the level off, and restore the state of the identifier-decl mappings
959 that were in effect when this level was entered.
961 If KEEP is nonzero, this level had explicit declarations, so
962 and create a "block" (a BLOCK node) for the level
963 to record its declarations and subblocks for symbol table output.
965 If FUNCTIONBODY is nonzero, this level is the body of a function,
966 so create a block as if KEEP were set and also clear out all
969 If REVERSE is nonzero, reverse the order of decls before putting
970 them into the BLOCK. */
973 poplevel (keep
, reverse
, functionbody
)
979 /* The chain of decls was accumulated in reverse order.
980 Put it into forward order, just for cleanliness. */
982 tree tags
= current_binding_level
->tags
;
983 tree subblocks
= current_binding_level
->blocks
;
986 int block_previously_created
;
988 keep
|= current_binding_level
->keep
;
990 /* This warning is turned off because it causes warnings for
991 declarations like `extern struct foo *x'. */
993 /* Warn about incomplete structure types in this level. */
994 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
995 if (!COMPLETE_TYPE_P (TREE_VALUE (link
)))
997 tree type
= TREE_VALUE (link
);
998 tree type_name
= TYPE_NAME (type
);
999 char *id
= IDENTIFIER_POINTER (TREE_CODE (type_name
) == IDENTIFIER_NODE
1001 : DECL_NAME (type_name
));
1002 switch (TREE_CODE (type
))
1005 error ("`struct %s' incomplete in scope ending here", id
);
1008 error ("`union %s' incomplete in scope ending here", id
);
1011 error ("`enum %s' incomplete in scope ending here", id
);
1017 /* Get the decls in the order they were written.
1018 Usually current_binding_level->names is in reverse order.
1019 But parameter decls were previously put in forward order. */
1022 current_binding_level
->names
1023 = decls
= nreverse (current_binding_level
->names
);
1025 decls
= current_binding_level
->names
;
1027 /* Output any nested inline functions within this block
1028 if they weren't already output. */
1030 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1031 if (TREE_CODE (decl
) == FUNCTION_DECL
1032 && ! TREE_ASM_WRITTEN (decl
)
1033 && DECL_INITIAL (decl
) != 0
1034 && TREE_ADDRESSABLE (decl
))
1036 /* If this decl was copied from a file-scope decl
1037 on account of a block-scope extern decl,
1038 propagate TREE_ADDRESSABLE to the file-scope decl.
1040 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1041 true, since then the decl goes through save_for_inline_copying. */
1042 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1043 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1044 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1045 else if (DECL_SAVED_INSNS (decl
) != 0)
1047 push_function_context ();
1048 output_inline_function (decl
);
1049 pop_function_context ();
1053 /* If there were any declarations or structure tags in that level,
1054 or if this level is a function body,
1055 create a BLOCK to record them for the life of this function. */
1058 block_previously_created
= (current_binding_level
->this_block
!= 0);
1059 if (block_previously_created
)
1060 block
= current_binding_level
->this_block
;
1061 else if (keep
|| functionbody
1062 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1063 block
= make_node (BLOCK
);
1066 BLOCK_VARS (block
) = decls
;
1067 BLOCK_SUBBLOCKS (block
) = subblocks
;
1070 /* In each subblock, record that this is its superior. */
1072 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1073 BLOCK_SUPERCONTEXT (link
) = block
;
1075 /* Clear out the meanings of the local variables of this level. */
1077 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1079 if (DECL_NAME (link
) != 0)
1081 /* If the ident. was used or addressed via a local extern decl,
1082 don't forget that fact. */
1083 if (DECL_EXTERNAL (link
))
1085 if (TREE_USED (link
))
1086 TREE_USED (DECL_NAME (link
)) = 1;
1087 if (TREE_ADDRESSABLE (link
))
1088 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1090 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1094 /* Restore all name-meanings of the outer levels
1095 that were shadowed by this level. */
1097 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1098 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1100 /* If the level being exited is the top level of a function,
1101 check over all the labels, and clear out the current
1102 (function local) meanings of their names. */
1106 clear_limbo_values (block
);
1108 /* If this is the top level block of a function,
1109 the vars are the function's parameters.
1110 Don't leave them in the BLOCK because they are
1111 found in the FUNCTION_DECL instead. */
1113 BLOCK_VARS (block
) = 0;
1115 /* Clear out the definitions of all label names,
1116 since their scopes end here,
1117 and add them to BLOCK_VARS. */
1119 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1121 register tree label
= TREE_VALUE (link
);
1123 if (DECL_INITIAL (label
) == 0)
1125 error_with_decl (label
, "label `%s' used but not defined");
1126 /* Avoid crashing later. */
1127 define_label (input_filename
, lineno
,
1130 else if (warn_unused_label
&& !TREE_USED (label
))
1131 warning_with_decl (label
, "label `%s' defined but not used");
1132 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1134 /* Put the labels into the "variables" of the
1135 top-level block, so debugger can see them. */
1136 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1137 BLOCK_VARS (block
) = label
;
1141 /* Pop the current level, and free the structure for reuse. */
1144 register struct binding_level
*level
= current_binding_level
;
1145 current_binding_level
= current_binding_level
->level_chain
;
1147 level
->level_chain
= free_binding_level
;
1148 free_binding_level
= level
;
1151 /* Dispose of the block that we just made inside some higher level. */
1153 DECL_INITIAL (current_function_decl
) = block
;
1156 if (!block_previously_created
)
1157 current_binding_level
->blocks
1158 = chainon (current_binding_level
->blocks
, block
);
1160 /* If we did not make a block for the level just exited,
1161 any blocks made for inner levels
1162 (since they cannot be recorded as subblocks in that level)
1163 must be carried forward so they will later become subblocks
1164 of something else. */
1166 current_binding_level
->blocks
1167 = chainon (current_binding_level
->blocks
, subblocks
);
1169 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1170 binding contour so that they point to the appropriate construct, i.e.
1171 either to the current FUNCTION_DECL node, or else to the BLOCK node
1172 we just constructed.
1174 Note that for tagged types whose scope is just the formal parameter
1175 list for some function type specification, we can't properly set
1176 their TYPE_CONTEXTs here, because we don't have a pointer to the
1177 appropriate FUNCTION_TYPE node readily available to us. For those
1178 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1179 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1180 node which will represent the "scope" for these "parameter list local"
1185 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1186 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1188 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1189 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1192 TREE_USED (block
) = 1;
1196 /* Delete the node BLOCK from the current binding level.
1197 This is used for the block inside a stmt expr ({...})
1198 so that the block can be reinserted where appropriate. */
1201 delete_block (block
)
1205 if (current_binding_level
->blocks
== block
)
1206 current_binding_level
->blocks
= TREE_CHAIN (block
);
1207 for (t
= current_binding_level
->blocks
; t
;)
1209 if (TREE_CHAIN (t
) == block
)
1210 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1214 TREE_CHAIN (block
) = NULL
;
1215 /* Clear TREE_USED which is always set by poplevel.
1216 The flag is set again if insert_block is called. */
1217 TREE_USED (block
) = 0;
1220 /* Insert BLOCK at the end of the list of subblocks of the
1221 current binding level. This is used when a BIND_EXPR is expanded,
1222 to handle the BLOCK node inside the BIND_EXPR. */
1225 insert_block (block
)
1228 TREE_USED (block
) = 1;
1229 current_binding_level
->blocks
1230 = chainon (current_binding_level
->blocks
, block
);
1233 /* Set the BLOCK node for the innermost scope
1234 (the one we are currently in). */
1238 register tree block
;
1240 current_binding_level
->this_block
= block
;
1246 register struct binding_level
*newlevel
;
1248 /* Reuse or create a struct for this binding level. */
1250 if (free_binding_level
)
1252 newlevel
= free_binding_level
;
1253 free_binding_level
= free_binding_level
->level_chain
;
1257 newlevel
= make_binding_level ();
1260 /* Add this level to the front of the chain (stack) of label levels. */
1262 newlevel
->level_chain
= label_level_chain
;
1263 label_level_chain
= newlevel
;
1265 newlevel
->names
= named_labels
;
1266 newlevel
->shadowed
= shadowed_labels
;
1268 shadowed_labels
= 0;
1274 register struct binding_level
*level
= label_level_chain
;
1277 /* Clear out the definitions of the declared labels in this level.
1278 Leave in the list any ordinary, non-declared labels. */
1279 for (link
= named_labels
, prev
= 0; link
;)
1281 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1283 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1285 error_with_decl (TREE_VALUE (link
),
1286 "label `%s' used but not defined");
1287 /* Avoid crashing later. */
1288 define_label (input_filename
, lineno
,
1289 DECL_NAME (TREE_VALUE (link
)));
1291 else if (warn_unused_label
&& !TREE_USED (TREE_VALUE (link
)))
1292 warning_with_decl (TREE_VALUE (link
),
1293 "label `%s' defined but not used");
1294 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1296 /* Delete this element from the list. */
1297 link
= TREE_CHAIN (link
);
1299 TREE_CHAIN (prev
) = link
;
1301 named_labels
= link
;
1306 link
= TREE_CHAIN (link
);
1310 /* Bring back all the labels that were shadowed. */
1311 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1312 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1313 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1314 = TREE_VALUE (link
);
1316 named_labels
= chainon (named_labels
, level
->names
);
1317 shadowed_labels
= level
->shadowed
;
1319 /* Pop the current level, and free the structure for reuse. */
1320 label_level_chain
= label_level_chain
->level_chain
;
1321 level
->level_chain
= free_binding_level
;
1322 free_binding_level
= level
;
1325 /* Push a definition or a declaration of struct, union or enum tag "name".
1326 "type" should be the type node.
1327 We assume that the tag "name" is not already defined.
1329 Note that the definition may really be just a forward reference.
1330 In that case, the TYPE_SIZE will be zero. */
1333 pushtag (name
, type
)
1336 register struct binding_level
*b
;
1338 /* Find the proper binding level for this type tag. */
1340 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1345 /* Record the identifier as the type's name if it has none. */
1347 if (TYPE_NAME (type
) == 0)
1348 TYPE_NAME (type
) = name
;
1351 b
->tags
= tree_cons (name
, type
, b
->tags
);
1353 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1354 tagged type we just added to the current binding level. This fake
1355 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1356 to output a representation of a tagged type, and it also gives
1357 us a convenient place to record the "scope start" address for the
1360 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1362 /* An approximation for now, so we can tell this is a function-scope tag.
1363 This will be updated in poplevel. */
1364 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1367 /* Handle when a new declaration NEWDECL
1368 has the same name as an old one OLDDECL
1369 in the same binding contour.
1370 Prints an error message if appropriate.
1372 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1373 Otherwise, return 0.
1375 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1376 and OLDDECL is in an outer binding level and should thus not be changed. */
1379 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1380 register tree newdecl
, olddecl
;
1381 int different_binding_level
;
1383 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1384 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1385 && DECL_INITIAL (newdecl
) != 0);
1386 tree oldtype
= TREE_TYPE (olddecl
);
1387 tree newtype
= TREE_TYPE (newdecl
);
1390 if (DECL_P (olddecl
))
1391 DECL_MACHINE_ATTRIBUTES (newdecl
)
1392 = merge_machine_decl_attributes (olddecl
, newdecl
);
1394 if (TREE_CODE (newtype
) == ERROR_MARK
1395 || TREE_CODE (oldtype
) == ERROR_MARK
)
1398 /* New decl is completely inconsistent with the old one =>
1399 tell caller to replace the old one.
1400 This is always an error except in the case of shadowing a builtin. */
1401 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1403 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1404 && (DECL_BUILT_IN (olddecl
)
1405 || DECL_BUILT_IN_NONANSI (olddecl
)))
1407 /* If you declare a built-in or predefined function name as static,
1408 the old definition is overridden,
1409 but optionally warn this was a bad choice of name. */
1410 if (!TREE_PUBLIC (newdecl
))
1414 else if (DECL_BUILT_IN (olddecl
))
1415 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1417 warning_with_decl (newdecl
, "shadowing library function `%s'");
1419 /* Likewise, if the built-in is not ansi, then programs can
1420 override it even globally without an error. */
1421 else if (! DECL_BUILT_IN (olddecl
))
1422 warning_with_decl (newdecl
,
1423 "library function `%s' declared as non-function");
1425 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1426 warning_with_decl (newdecl
,
1427 "built-in function `%s' declared as non-function");
1429 warning_with_decl (newdecl
,
1430 "built-in function `%s' declared as non-function");
1434 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1435 error_with_decl (olddecl
, "previous declaration of `%s'");
1441 /* For real parm decl following a forward decl,
1442 return 1 so old decl will be reused. */
1443 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1444 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1447 /* The new declaration is the same kind of object as the old one.
1448 The declarations may partially match. Print warnings if they don't
1449 match enough. Ultimately, copy most of the information from the new
1450 decl to the old one, and keep using the old one. */
1452 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1453 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1454 && DECL_INITIAL (olddecl
) == 0)
1455 /* If -traditional, avoid error for redeclaring fcn
1456 after implicit decl. */
1458 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1459 && DECL_BUILT_IN (olddecl
))
1461 /* A function declaration for a built-in function. */
1462 if (!TREE_PUBLIC (newdecl
))
1464 /* If you declare a built-in function name as static, the
1465 built-in definition is overridden,
1466 but optionally warn this was a bad choice of name. */
1468 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1469 /* Discard the old built-in function. */
1472 else if (!types_match
)
1474 /* Accept the return type of the new declaration if same modes. */
1475 tree oldreturntype
= TREE_TYPE (oldtype
);
1476 tree newreturntype
= TREE_TYPE (newtype
);
1478 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1480 /* Function types may be shared, so we can't just modify
1481 the return type of olddecl's function type. */
1483 = build_function_type (newreturntype
,
1484 TYPE_ARG_TYPES (oldtype
));
1486 types_match
= comptypes (newtype
, trytype
);
1490 /* Accept harmless mismatch in first argument type also.
1492 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1493 && TYPE_ARG_TYPES (oldtype
) != 0
1494 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1495 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1496 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1497 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1499 /* Function types may be shared, so we can't just modify
1500 the return type of olddecl's function type. */
1502 = build_function_type (TREE_TYPE (oldtype
),
1503 tree_cons (NULL_TREE
,
1504 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1505 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1507 types_match
= comptypes (newtype
, trytype
);
1511 if (! different_binding_level
)
1512 TREE_TYPE (olddecl
) = oldtype
;
1516 /* If types don't match for a built-in, throw away the built-in. */
1517 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1521 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1522 && DECL_SOURCE_LINE (olddecl
) == 0)
1524 /* A function declaration for a predeclared function
1525 that isn't actually built in. */
1526 if (!TREE_PUBLIC (newdecl
))
1528 /* If you declare it as static, the
1529 default definition is overridden. */
1532 else if (!types_match
)
1534 /* If the types don't match, preserve volatility indication.
1535 Later on, we will discard everything else about the
1536 default declaration. */
1537 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1540 /* Permit char *foo () to match void *foo (...) if not pedantic,
1541 if one of them came from a system header file. */
1542 else if (!types_match
1543 && TREE_CODE (olddecl
) == FUNCTION_DECL
1544 && TREE_CODE (newdecl
) == FUNCTION_DECL
1545 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1546 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1547 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1548 || DECL_IN_SYSTEM_HEADER (newdecl
))
1549 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1550 && TYPE_ARG_TYPES (oldtype
) == 0
1551 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1552 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1554 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1555 && TYPE_ARG_TYPES (newtype
) == 0
1556 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1557 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1560 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1561 /* Make sure we keep void * as ret type, not char *. */
1562 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1563 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1565 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1566 we will come back here again. */
1567 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1569 else if (!types_match
1570 /* Permit char *foo (int, ...); followed by char *foo ();
1572 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1574 /* Return types must still match. */
1575 && comptypes (TREE_TYPE (oldtype
),
1576 TREE_TYPE (newtype
))
1577 && TYPE_ARG_TYPES (newtype
) == 0))
1579 error_with_decl (newdecl
, "conflicting types for `%s'");
1580 /* Check for function type mismatch
1581 involving an empty arglist vs a nonempty one. */
1582 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1583 && comptypes (TREE_TYPE (oldtype
),
1584 TREE_TYPE (newtype
))
1585 && ((TYPE_ARG_TYPES (oldtype
) == 0
1586 && DECL_INITIAL (olddecl
) == 0)
1588 (TYPE_ARG_TYPES (newtype
) == 0
1589 && DECL_INITIAL (newdecl
) == 0)))
1591 /* Classify the problem further. */
1592 register tree t
= TYPE_ARG_TYPES (oldtype
);
1594 t
= TYPE_ARG_TYPES (newtype
);
1595 for (; t
; t
= TREE_CHAIN (t
))
1597 register tree type
= TREE_VALUE (t
);
1599 if (TREE_CHAIN (t
) == 0
1600 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1602 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1606 if (simple_type_promotes_to (type
) != NULL_TREE
)
1608 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1613 error_with_decl (olddecl
, "previous declaration of `%s'");
1617 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1623 error_with_decl (newdecl
, "redefinition of `%s'");
1626 error_with_decl (newdecl
, "redeclaration of `%s'");
1629 error_with_decl (newdecl
, "conflicting declarations of `%s'");
1635 error_with_decl (olddecl
,
1636 ((DECL_INITIAL (olddecl
)
1637 && current_binding_level
== global_binding_level
)
1638 ? "`%s' previously defined here"
1639 : "`%s' previously declared here"));
1641 else if (TREE_CODE (newdecl
) == TYPE_DECL
1642 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1643 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1645 warning_with_decl (newdecl
, "redefinition of `%s'");
1648 ((DECL_INITIAL (olddecl
)
1649 && current_binding_level
== global_binding_level
)
1650 ? "`%s' previously defined here"
1651 : "`%s' previously declared here"));
1653 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1654 && DECL_INITIAL (olddecl
) != 0
1655 && TYPE_ARG_TYPES (oldtype
) == 0
1656 && TYPE_ARG_TYPES (newtype
) != 0
1657 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1659 register tree type
, parm
;
1661 /* Prototype decl follows defn w/o prototype. */
1663 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1664 type
= TYPE_ARG_TYPES (newtype
),
1667 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1669 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1670 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1672 warning_with_decl (newdecl
, "prototype for `%s' follows");
1673 warning_with_decl (olddecl
, "non-prototype definition here");
1676 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1677 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1679 error_with_decl (newdecl
, "prototype for `%s' follows and number of arguments doesn't match");
1680 error_with_decl (olddecl
, "non-prototype definition here");
1684 /* Type for passing arg must be consistent
1685 with that declared for the arg. */
1686 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1687 /* If -traditional, allow `unsigned int' instead of `int'
1688 in the prototype. */
1689 && (! (flag_traditional
1690 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1691 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1693 error_with_decl (newdecl
,
1694 "prototype for `%s' follows and argument %d doesn't match",
1696 error_with_decl (olddecl
, "non-prototype definition here");
1702 /* Warn about mismatches in various flags. */
1705 /* Warn if function is now inline
1706 but was previously declared not inline and has been called. */
1707 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1708 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1709 && TREE_USED (olddecl
))
1710 warning_with_decl (newdecl
,
1711 "`%s' declared inline after being called");
1712 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1713 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1714 && DECL_INITIAL (olddecl
) != 0)
1715 warning_with_decl (newdecl
,
1716 "`%s' declared inline after its definition");
1718 /* If pedantic, warn when static declaration follows a non-static
1719 declaration. Otherwise, do so only for functions. */
1720 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1721 && TREE_PUBLIC (olddecl
)
1722 && !TREE_PUBLIC (newdecl
))
1723 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1725 /* If warn_traditional, warn when a non-static function
1726 declaration follows a static one. */
1727 if (warn_traditional
1728 && TREE_CODE (olddecl
) == FUNCTION_DECL
1729 && !TREE_PUBLIC (olddecl
)
1730 && TREE_PUBLIC (newdecl
))
1731 warning_with_decl (newdecl
, "non-static declaration for `%s' follows static");
1733 /* Warn when const declaration follows a non-const
1734 declaration, but not for functions. */
1735 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1736 && !TREE_READONLY (olddecl
)
1737 && TREE_READONLY (newdecl
))
1738 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1739 /* These bits are logically part of the type, for variables.
1740 But not for functions
1741 (where qualifiers are not valid ANSI anyway). */
1742 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1743 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1744 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1745 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1749 /* Optionally warn about more than one declaration for the same name. */
1750 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1751 /* Don't warn about a function declaration
1752 followed by a definition. */
1753 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1754 && DECL_INITIAL (olddecl
) == 0)
1755 /* Don't warn about extern decl followed by (tentative) definition. */
1756 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1758 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1759 warning_with_decl (olddecl
, "previous declaration of `%s'");
1762 /* Copy all the DECL_... slots specified in the new decl
1763 except for any that we copy here from the old type.
1765 Past this point, we don't change OLDTYPE and NEWTYPE
1766 even if we change the types of NEWDECL and OLDDECL. */
1770 /* When copying info to olddecl, we store into write_olddecl
1771 instead. This allows us to avoid modifying olddecl when
1772 different_binding_level is true. */
1773 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1775 /* Merge the data types specified in the two decls. */
1776 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1778 if (different_binding_level
)
1780 = build_type_attribute_variant
1782 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1783 TYPE_ATTRIBUTES (oldtype
)));
1786 = TREE_TYPE (olddecl
)
1787 = common_type (newtype
, oldtype
);
1790 /* Lay the type out, unless already done. */
1791 if (oldtype
!= TREE_TYPE (newdecl
))
1793 if (TREE_TYPE (newdecl
) != error_mark_node
)
1794 layout_type (TREE_TYPE (newdecl
));
1795 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1796 && TREE_CODE (newdecl
) != TYPE_DECL
1797 && TREE_CODE (newdecl
) != CONST_DECL
)
1798 layout_decl (newdecl
, 0);
1802 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1803 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1804 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1805 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1806 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1807 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1808 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1811 /* Keep the old rtl since we can safely use it. */
1812 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1814 /* Merge the type qualifiers. */
1815 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1816 && DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1817 && ! TREE_THIS_VOLATILE (newdecl
))
1818 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1820 if (TREE_READONLY (newdecl
))
1821 TREE_READONLY (write_olddecl
) = 1;
1823 if (TREE_THIS_VOLATILE (newdecl
))
1825 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1826 if (TREE_CODE (newdecl
) == VAR_DECL
)
1827 make_var_volatile (newdecl
);
1830 /* Keep source location of definition rather than declaration. */
1831 /* When called with different_binding_level set, keep the old
1832 information so that meaningful diagnostics can be given. */
1833 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1834 && ! different_binding_level
)
1836 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1837 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1840 /* Merge the unused-warning information. */
1841 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1842 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1843 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1844 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1846 /* Merge the initialization information. */
1847 /* When called with different_binding_level set, don't copy over
1848 DECL_INITIAL, so that we don't accidentally change function
1849 declarations into function definitions. */
1850 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1851 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1853 /* Merge the section attribute.
1854 We want to issue an error if the sections conflict but that must be
1855 done later in decl_attributes since we are called before attributes
1857 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1858 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1860 /* Copy the assembler name.
1861 Currently, it can only be defined in the prototype. */
1862 DECL_ASSEMBLER_NAME (newdecl
) = DECL_ASSEMBLER_NAME (olddecl
);
1864 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1866 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1867 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1869 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1870 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1871 DECL_NO_CHECK_MEMORY_USAGE (newdecl
)
1872 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl
);
1873 DECL_NO_LIMIT_STACK (newdecl
)
1874 |= DECL_NO_LIMIT_STACK (olddecl
);
1877 /* If cannot merge, then use the new type and qualifiers,
1878 and don't preserve the old rtl. */
1879 else if (! different_binding_level
)
1881 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1882 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1883 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1884 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1887 /* Merge the storage class information. */
1888 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1889 /* For functions, static overrides non-static. */
1890 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1892 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1893 /* This is since we don't automatically
1894 copy the attributes of NEWDECL into OLDDECL. */
1895 /* No need to worry about different_binding_level here because
1896 then TREE_PUBLIC (newdecl) was true. */
1897 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1898 /* If this clears `static', clear it in the identifier too. */
1899 if (! TREE_PUBLIC (olddecl
))
1900 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1902 if (DECL_EXTERNAL (newdecl
))
1904 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1905 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1906 /* An extern decl does not override previous storage class. */
1907 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1908 if (! DECL_EXTERNAL (newdecl
))
1909 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1913 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1914 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1917 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1919 /* If either decl says `inline', this fn is inline,
1920 unless its definition was passed already. */
1921 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1922 DECL_INLINE (olddecl
) = 1;
1924 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1926 if (DECL_BUILT_IN (olddecl
))
1928 /* Get rid of any built-in function if new arg types don't match it
1929 or if we have a function definition. */
1930 if (! types_match
|| new_is_definition
)
1932 if (! different_binding_level
)
1934 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1935 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
1940 /* If redeclaring a builtin function, and not a definition,
1941 it stays built in. */
1942 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1943 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1946 /* Also preserve various other info from the definition. */
1947 else if (! new_is_definition
)
1948 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1949 if (! new_is_definition
)
1951 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1952 /* When called with different_binding_level set, don't copy over
1953 DECL_INITIAL, so that we don't accidentally change function
1954 declarations into function definitions. */
1955 if (! different_binding_level
)
1956 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1957 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1958 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1959 if (DECL_INLINE (newdecl
))
1960 DECL_ABSTRACT_ORIGIN (newdecl
) = DECL_ORIGIN (olddecl
);
1963 if (different_binding_level
)
1965 /* Don't output a duplicate symbol or debugging information for this
1968 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1969 just have two declarations without a definition. VAR_DECLs may need
1970 the same treatment, I'm not sure. */
1971 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1972 DECL_IGNORED_P (newdecl
) = 1;
1974 TREE_ASM_WRITTEN (newdecl
) = DECL_IGNORED_P (newdecl
) = 1;
1978 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1979 But preserve OLDDECL's DECL_UID. */
1981 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1983 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1984 (char *) olddecl
+ sizeof (struct tree_common
),
1985 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1986 DECL_UID (olddecl
) = olddecl_uid
;
1989 /* NEWDECL contains the merged attribute lists.
1990 Update OLDDECL to be the same. */
1991 DECL_MACHINE_ATTRIBUTES (olddecl
) = DECL_MACHINE_ATTRIBUTES (newdecl
);
1996 /* Record a decl-node X as belonging to the current lexical scope.
1997 Check for errors (such as an incompatible declaration for the same
1998 name already seen in the same scope).
2000 Returns either X or an old decl for the same name.
2001 If an old decl is returned, it may have been smashed
2002 to agree with what X says. */
2009 register tree name
= DECL_NAME (x
);
2010 register struct binding_level
*b
= current_binding_level
;
2012 DECL_CONTEXT (x
) = current_function_decl
;
2013 /* A local extern declaration for a function doesn't constitute nesting.
2014 A local auto declaration does, since it's a forward decl
2015 for a nested function coming later. */
2016 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
2017 && DECL_EXTERNAL (x
))
2018 DECL_CONTEXT (x
) = 0;
2020 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
2021 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2022 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2023 && !DECL_IN_SYSTEM_HEADER (x
))
2024 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
2030 int different_binding_level
= 0;
2032 t
= lookup_name_current_level (name
);
2033 /* Don't type check externs here when -traditional. This is so that
2034 code with conflicting declarations inside blocks will get warnings
2035 not errors. X11 for instance depends on this. */
2036 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2038 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2039 /* Type decls at global scope don't conflict with externs declared
2040 inside lexical blocks. */
2041 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2043 different_binding_level
= 1;
2045 if (t
!= 0 && t
== error_mark_node
)
2046 /* error_mark_node is 0 for a while during initialization! */
2049 error_with_decl (x
, "`%s' used prior to declaration");
2054 file
= DECL_SOURCE_FILE (t
);
2055 line
= DECL_SOURCE_LINE (t
);
2058 /* If this decl is `static' and an implicit decl was seen previously,
2059 warn. But don't complain if -traditional,
2060 since traditional compilers don't complain. */
2061 if (! flag_traditional
&& TREE_PUBLIC (name
)
2062 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2063 sets this for all functions. */
2064 && ! TREE_PUBLIC (x
)
2065 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2066 /* We used to warn also for explicit extern followed by static,
2067 but sometimes you need to do it that way. */
2068 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2070 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2071 IDENTIFIER_POINTER (name
));
2072 pedwarn_with_file_and_line
2073 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2074 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2075 "previous declaration of `%s'",
2076 IDENTIFIER_POINTER (name
));
2077 TREE_THIS_VOLATILE (name
) = 1;
2080 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2082 if (TREE_CODE (t
) == PARM_DECL
)
2084 /* Don't allow more than one "real" duplicate
2085 of a forward parm decl. */
2086 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2092 /* If we are processing a typedef statement, generate a whole new
2093 ..._TYPE node (which will be just an variant of the existing
2094 ..._TYPE node with identical properties) and then install the
2095 TYPE_DECL node generated to represent the typedef name as the
2096 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2098 The whole point here is to end up with a situation where each
2099 and every ..._TYPE node the compiler creates will be uniquely
2100 associated with AT MOST one node representing a typedef name.
2101 This way, even though the compiler substitutes corresponding
2102 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2103 early on, later parts of the compiler can always do the reverse
2104 translation and get back the corresponding typedef name. For
2107 typedef struct S MY_TYPE;
2110 Later parts of the compiler might only know that `object' was of
2111 type `struct S' if it were not for code just below. With this
2112 code however, later parts of the compiler see something like:
2114 struct S' == struct S
2115 typedef struct S' MY_TYPE;
2118 And they can then deduce (from the node for type struct S') that
2119 the original object declaration was:
2123 Being able to do this is important for proper support of protoize,
2124 and also for generating precise symbolic debugging information
2125 which takes full account of the programmer's (typedef) vocabulary.
2127 Obviously, we don't want to generate a duplicate ..._TYPE node if
2128 the TYPE_DECL node that we are now processing really represents a
2129 standard built-in type.
2131 Since all standard types are effectively declared at line zero
2132 in the source file, we can easily check to see if we are working
2133 on a standard type by checking the current value of lineno. */
2135 if (TREE_CODE (x
) == TYPE_DECL
)
2137 if (DECL_SOURCE_LINE (x
) == 0)
2139 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2140 TYPE_NAME (TREE_TYPE (x
)) = x
;
2142 else if (TREE_TYPE (x
) != error_mark_node
2143 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2145 tree tt
= TREE_TYPE (x
);
2146 DECL_ORIGINAL_TYPE (x
) = tt
;
2147 tt
= build_type_copy (tt
);
2149 TREE_USED (tt
) = TREE_USED (x
);
2154 /* Multiple external decls of the same identifier ought to match.
2155 Check against both global declarations (when traditional) and out of
2156 scope (limbo) block level declarations.
2158 We get warnings about inline functions where they are defined.
2159 Avoid duplicate warnings where they are used. */
2161 && ! (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INLINE (x
)))
2165 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2166 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2167 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2168 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2169 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2170 /* Decls in limbo are always extern, so no need to check that. */
2171 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2175 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2176 /* If old decl is built-in, we already warned if we should. */
2177 && !DECL_BUILT_IN (decl
))
2179 pedwarn_with_decl (x
,
2180 "type mismatch with previous external decl");
2181 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2185 /* If a function has had an implicit declaration, and then is defined,
2186 make sure they are compatible. */
2188 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2189 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2190 && TREE_CODE (x
) == FUNCTION_DECL
2191 && ! comptypes (TREE_TYPE (x
),
2192 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2194 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2195 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2196 "previous implicit declaration of `%s'");
2199 /* In PCC-compatibility mode, extern decls of vars with no current decl
2200 take effect at top level no matter where they are. */
2201 if (flag_traditional
&& DECL_EXTERNAL (x
)
2202 && lookup_name (name
) == 0)
2204 tree type
= TREE_TYPE (x
);
2206 /* But don't do this if the type contains temporary nodes. */
2209 if (type
== error_mark_node
)
2211 if (TYPE_CONTEXT (type
))
2213 warning_with_decl (x
, "type of external `%s' is not global");
2214 /* By exiting the loop early, we leave TYPE nonzero,
2215 and thus prevent globalization of the decl. */
2218 else if (TREE_CODE (type
) == FUNCTION_TYPE
2219 && TYPE_ARG_TYPES (type
) != 0)
2220 /* The types might not be truly local,
2221 but the list of arg types certainly is temporary.
2222 Since prototypes are nontraditional,
2223 ok not to do the traditional thing. */
2225 type
= TREE_TYPE (type
);
2229 b
= global_binding_level
;
2232 /* This name is new in its binding level.
2233 Install the new declaration and return it. */
2234 if (b
== global_binding_level
)
2236 /* Install a global value. */
2238 /* If the first global decl has external linkage,
2239 warn if we later see static one. */
2240 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2241 TREE_PUBLIC (name
) = 1;
2243 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2245 /* We no longer care about any previous block level declarations. */
2246 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2248 /* Don't forget if the function was used via an implicit decl. */
2249 if (IDENTIFIER_IMPLICIT_DECL (name
)
2250 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2251 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2253 /* Don't forget if its address was taken in that way. */
2254 if (IDENTIFIER_IMPLICIT_DECL (name
)
2255 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2256 TREE_ADDRESSABLE (x
) = 1;
2258 /* Warn about mismatches against previous implicit decl. */
2259 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2260 /* If this real decl matches the implicit, don't complain. */
2261 && ! (TREE_CODE (x
) == FUNCTION_DECL
2262 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2263 == integer_type_node
)))
2264 pedwarn ("`%s' was previously implicitly declared to return `int'",
2265 IDENTIFIER_POINTER (name
));
2267 /* If this decl is `static' and an `extern' was seen previously,
2268 that is erroneous. */
2269 if (TREE_PUBLIC (name
)
2270 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2272 /* Okay to redeclare an ANSI built-in as static. */
2273 if (t
!= 0 && DECL_BUILT_IN (t
))
2275 /* Okay to declare a non-ANSI built-in as anything. */
2276 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2278 /* Okay to have global type decl after an earlier extern
2279 declaration inside a lexical block. */
2280 else if (TREE_CODE (x
) == TYPE_DECL
)
2282 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2284 if (! TREE_THIS_VOLATILE (name
))
2285 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2286 IDENTIFIER_POINTER (name
));
2289 pedwarn ("`%s' was declared `extern' and later `static'",
2290 IDENTIFIER_POINTER (name
));
2295 /* Here to install a non-global value. */
2296 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2297 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2299 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2301 /* If this is an extern function declaration, see if we
2302 have a global definition or declaration for the function. */
2305 && TREE_CODE (x
) == FUNCTION_DECL
2306 && TREE_CODE (oldglobal
) == FUNCTION_DECL
2307 && DECL_EXTERNAL (x
) && ! DECL_INLINE (x
))
2309 /* We have one. Their types must agree. */
2310 if (! comptypes (TREE_TYPE (x
),
2311 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2312 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2315 /* Inner extern decl is inline if global one is.
2316 Copy enough to really inline it. */
2317 if (DECL_INLINE (oldglobal
))
2319 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2320 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2321 ? 0 : DECL_INITIAL (oldglobal
));
2322 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2323 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2324 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2325 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2326 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2327 DECL_ABSTRACT_ORIGIN (x
) = DECL_ORIGIN (oldglobal
);
2329 /* Inner extern decl is built-in if global one is. */
2330 if (DECL_BUILT_IN (oldglobal
))
2332 DECL_BUILT_IN_CLASS (x
) = DECL_BUILT_IN_CLASS (oldglobal
);
2333 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2335 /* Keep the arg types from a file-scope fcn defn. */
2336 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2337 && DECL_INITIAL (oldglobal
)
2338 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2339 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2343 #if 0 /* This case is probably sometimes the right thing to do. */
2344 /* If we have a local external declaration,
2345 then any file-scope declaration should not
2346 have been static. */
2347 if (oldlocal
== 0 && oldglobal
!= 0
2348 && !TREE_PUBLIC (oldglobal
)
2349 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2350 warning ("`%s' locally external but globally static",
2351 IDENTIFIER_POINTER (name
));
2354 /* If we have a local external declaration,
2355 and no file-scope declaration has yet been seen,
2356 then if we later have a file-scope decl it must not be static. */
2358 && DECL_EXTERNAL (x
)
2362 TREE_PUBLIC (name
) = 1;
2364 /* Save this decl, so that we can do type checking against
2365 other decls after it falls out of scope.
2367 Only save it once. This prevents temporary decls created in
2368 expand_inline_function from being used here, since this
2369 will have been set when the inline function was parsed.
2370 It also helps give slightly better warnings. */
2371 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2372 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2375 /* Warn if shadowing an argument at the top level of the body. */
2376 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2377 /* This warning doesn't apply to the parms of a nested fcn. */
2378 && ! current_binding_level
->parm_flag
2379 /* Check that this is one level down from the parms. */
2380 && current_binding_level
->level_chain
->parm_flag
2381 /* Check that the decl being shadowed
2382 comes from the parm level, one level up. */
2383 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2385 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2386 pedwarn ("declaration of `%s' shadows a parameter",
2387 IDENTIFIER_POINTER (name
));
2389 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2390 IDENTIFIER_POINTER (name
));
2393 /* Maybe warn if shadowing something else. */
2394 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2395 /* No shadow warnings for internally generated vars. */
2396 && DECL_SOURCE_LINE (x
) != 0
2397 /* No shadow warnings for vars made for inlining. */
2398 && ! DECL_FROM_INLINE (x
))
2400 char *id
= IDENTIFIER_POINTER (name
);
2402 if (TREE_CODE (x
) == PARM_DECL
2403 && current_binding_level
->level_chain
->parm_flag
)
2404 /* Don't warn about the parm names in function declarator
2405 within a function declarator.
2406 It would be nice to avoid warning in any function
2407 declarator in a declaration, as opposed to a definition,
2408 but there is no way to tell it's not a definition. */
2410 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2411 warning ("declaration of `%s' shadows a parameter", id
);
2412 else if (oldlocal
!= 0)
2413 warning ("declaration of `%s' shadows previous local", id
);
2414 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2415 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2416 warning ("declaration of `%s' shadows global declaration", id
);
2419 /* If storing a local value, there may already be one (inherited).
2420 If so, record it for restoration when this binding level ends. */
2422 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2425 /* Keep count of variables in this level with incomplete type. */
2426 if (!COMPLETE_TYPE_P (TREE_TYPE (x
)))
2430 /* Put decls on list in reverse order.
2431 We will reverse them later if necessary. */
2432 TREE_CHAIN (x
) = b
->names
;
2438 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2441 pushdecl_top_level (x
)
2445 register struct binding_level
*b
= current_binding_level
;
2447 current_binding_level
= global_binding_level
;
2449 current_binding_level
= b
;
2453 /* Generate an implicit declaration for identifier FUNCTIONID
2454 as a function of type int (). Print a warning if appropriate. */
2457 implicitly_declare (functionid
)
2461 int traditional_warning
= 0;
2462 /* Only one "implicit declaration" warning per identifier. */
2463 int implicit_warning
;
2465 /* We used to reuse an old implicit decl here,
2466 but this loses with inline functions because it can clobber
2467 the saved decl chains. */
2468 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2469 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2471 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2473 /* Warn of implicit decl following explicit local extern decl.
2474 This is probably a program designed for traditional C. */
2475 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2476 traditional_warning
= 1;
2478 /* Warn once of an implicit declaration. */
2479 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2481 DECL_EXTERNAL (decl
) = 1;
2482 TREE_PUBLIC (decl
) = 1;
2484 /* Record that we have an implicit decl and this is it. */
2485 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2487 /* ANSI standard says implicit declarations are in the innermost block.
2488 So we record the decl in the standard fashion.
2489 If flag_traditional is set, pushdecl does it top-level. */
2492 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2493 maybe_objc_check_decl (decl
);
2495 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2497 if (mesg_implicit_function_declaration
&& implicit_warning
)
2499 if (mesg_implicit_function_declaration
== 2)
2500 error ("implicit declaration of function `%s'",
2501 IDENTIFIER_POINTER (functionid
));
2503 warning ("implicit declaration of function `%s'",
2504 IDENTIFIER_POINTER (functionid
));
2506 else if (warn_traditional
&& traditional_warning
)
2507 warning ("function `%s' was previously declared within a block",
2508 IDENTIFIER_POINTER (functionid
));
2510 /* Write a record describing this implicit function declaration to the
2511 prototypes file (if requested). */
2513 gen_aux_info_record (decl
, 0, 1, 0);
2518 /* Return zero if the declaration NEWDECL is valid
2519 when the declaration OLDDECL (assumed to be for the same name)
2520 has already been seen.
2521 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2522 and 3 if it is a conflicting declaration. */
2525 redeclaration_error_message (newdecl
, olddecl
)
2526 tree newdecl
, olddecl
;
2528 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2530 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2532 /* pushdecl creates distinct types for TYPE_DECLs by calling
2533 build_type_copy, so the above comparison generally fails. We do
2534 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2535 is equivalent to what this code used to do before the build_type_copy
2536 call. The variant type distinction should not matter for traditional
2537 code, because it doesn't have type qualifiers. */
2538 if (flag_traditional
2539 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2541 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2545 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2547 /* Declarations of functions can insist on internal linkage
2548 but they can't be inconsistent with internal linkage,
2549 so there can be no error on that account.
2550 However defining the same name twice is no good. */
2551 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2552 /* However, defining once as extern inline and a second
2553 time in another way is ok. */
2554 && ! (DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2555 && ! (DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2559 else if (current_binding_level
== global_binding_level
)
2561 /* Objects declared at top level: */
2562 /* If at least one is a reference, it's ok. */
2563 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2565 /* Reject two definitions. */
2566 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2568 /* Now we have two tentative defs, or one tentative and one real def. */
2569 /* Insist that the linkage match. */
2570 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2574 else if (current_binding_level
->parm_flag
2575 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2579 /* Newdecl has block scope. If olddecl has block scope also, then
2580 reject two definitions, and reject a definition together with an
2581 external reference. Otherwise, it is OK, because newdecl must
2582 be an extern reference to olddecl. */
2583 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2584 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2590 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2591 Create one if none exists so far for the current function.
2592 This function is called for both label definitions and label references. */
2598 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2600 if (current_function_decl
== 0)
2602 error ("label %s referenced outside of any function",
2603 IDENTIFIER_POINTER (id
));
2607 /* Use a label already defined or ref'd with this name. */
2610 /* But not if it is inherited and wasn't declared to be inheritable. */
2611 if (DECL_CONTEXT (decl
) != current_function_decl
2612 && ! C_DECLARED_LABEL_FLAG (decl
))
2613 return shadow_label (id
);
2617 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2619 /* Make sure every label has an rtx. */
2622 /* A label not explicitly declared must be local to where it's ref'd. */
2623 DECL_CONTEXT (decl
) = current_function_decl
;
2625 DECL_MODE (decl
) = VOIDmode
;
2627 /* Say where one reference is to the label,
2628 for the sake of the error if it is not defined. */
2629 DECL_SOURCE_LINE (decl
) = lineno
;
2630 DECL_SOURCE_FILE (decl
) = input_filename
;
2632 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2634 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2639 /* Make a label named NAME in the current function,
2640 shadowing silently any that may be inherited from containing functions
2641 or containing scopes.
2643 Note that valid use, if the label being shadowed
2644 comes from another scope in the same function,
2645 requires calling declare_nonlocal_label right away. */
2651 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2657 /* Check to make sure that the label hasn't already been declared
2658 at this label scope */
2659 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2660 if (TREE_VALUE (dup
) == decl
)
2662 error ("duplicate label declaration `%s'",
2663 IDENTIFIER_POINTER (name
));
2664 error_with_decl (TREE_VALUE (dup
),
2665 "this is a previous declaration");
2666 /* Just use the previous declaration. */
2667 return lookup_label (name
);
2670 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2671 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2674 return lookup_label (name
);
2677 /* Define a label, specifying the location in the source file.
2678 Return the LABEL_DECL node for the label, if the definition is valid.
2679 Otherwise return 0. */
2682 define_label (filename
, line
, name
)
2683 const char *filename
;
2687 tree decl
= lookup_label (name
);
2689 /* If label with this name is known from an outer context, shadow it. */
2690 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2692 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2693 IDENTIFIER_LABEL_VALUE (name
) = 0;
2694 decl
= lookup_label (name
);
2697 if (DECL_INITIAL (decl
) != 0)
2699 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2704 /* Mark label as having been defined. */
2705 DECL_INITIAL (decl
) = error_mark_node
;
2706 /* Say where in the source. */
2707 DECL_SOURCE_FILE (decl
) = filename
;
2708 DECL_SOURCE_LINE (decl
) = line
;
2713 /* Return the list of declarations of the current level.
2714 Note that this list is in reverse order unless/until
2715 you nreverse it; and when you do nreverse it, you must
2716 store the result back using `storedecls' or you will lose. */
2721 return current_binding_level
->names
;
2724 /* Return the list of type-tags (for structs, etc) of the current level. */
2729 return current_binding_level
->tags
;
2732 /* Store the list of declarations of the current level.
2733 This is done for the parameter declarations of a function being defined,
2734 after they are modified in the light of any missing parameters. */
2740 current_binding_level
->names
= decls
;
2743 /* Similarly, store the list of tags of the current level. */
2749 current_binding_level
->tags
= tags
;
2752 /* Given NAME, an IDENTIFIER_NODE,
2753 return the structure (or union or enum) definition for that name.
2754 Searches binding levels from BINDING_LEVEL up to the global level.
2755 If THISLEVEL_ONLY is nonzero, searches only the specified context
2756 (but skips any tag-transparent contexts to find one that is
2757 meaningful for tags).
2758 CODE says which kind of type the caller wants;
2759 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2760 If the wrong kind of type is found, an error is reported. */
2763 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2764 enum tree_code code
;
2765 struct binding_level
*binding_level
;
2769 register struct binding_level
*level
;
2771 for (level
= binding_level
; level
; level
= level
->level_chain
)
2774 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2776 if (TREE_PURPOSE (tail
) == name
)
2778 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2780 /* Definition isn't the kind we were looking for. */
2781 pending_invalid_xref
= name
;
2782 pending_invalid_xref_file
= input_filename
;
2783 pending_invalid_xref_line
= lineno
;
2785 return TREE_VALUE (tail
);
2788 if (thislevel_only
&& ! level
->tag_transparent
)
2794 /* Print an error message now
2795 for a recent invalid struct, union or enum cross reference.
2796 We don't print them immediately because they are not invalid
2797 when used in the `struct foo;' construct for shadowing. */
2800 pending_xref_error ()
2802 if (pending_invalid_xref
!= 0)
2803 error_with_file_and_line (pending_invalid_xref_file
,
2804 pending_invalid_xref_line
,
2805 "`%s' defined as wrong kind of tag",
2806 IDENTIFIER_POINTER (pending_invalid_xref
));
2807 pending_invalid_xref
= 0;
2810 /* Given a type, find the tag that was defined for it and return the tag name.
2811 Otherwise return 0. */
2814 lookup_tag_reverse (type
)
2817 register struct binding_level
*level
;
2819 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2822 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2824 if (TREE_VALUE (tail
) == type
)
2825 return TREE_PURPOSE (tail
);
2831 /* Look up NAME in the current binding level and its superiors
2832 in the namespace of variables, functions and typedefs.
2833 Return a ..._DECL node of some kind representing its definition,
2834 or return 0 if it is undefined. */
2841 if (current_binding_level
!= global_binding_level
2842 && IDENTIFIER_LOCAL_VALUE (name
))
2843 val
= IDENTIFIER_LOCAL_VALUE (name
);
2845 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2849 /* Similar to `lookup_name' but look only at current binding level. */
2852 lookup_name_current_level (name
)
2857 if (current_binding_level
== global_binding_level
)
2858 return IDENTIFIER_GLOBAL_VALUE (name
);
2860 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2863 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2864 if (DECL_NAME (t
) == name
)
2870 /* Mark ARG for GC. */
2873 mark_binding_level (arg
)
2876 struct binding_level
*level
= *(struct binding_level
**) arg
;
2878 for (; level
!= 0; level
= level
->level_chain
)
2880 ggc_mark_tree (level
->names
);
2881 ggc_mark_tree (level
->tags
);
2882 ggc_mark_tree (level
->shadowed
);
2883 ggc_mark_tree (level
->blocks
);
2884 ggc_mark_tree (level
->this_block
);
2885 ggc_mark_tree (level
->parm_order
);
2889 /* Create the predefined scalar types of C,
2890 and some nodes representing standard constants (0, 1, (void *) 0).
2891 Initialize the global binding level.
2892 Make definitions for built-in primitive functions. */
2895 init_decl_processing ()
2897 register tree endlink
;
2898 tree ptr_ftype_void
, ptr_ftype_ptr
;
2899 int wchar_type_size
;
2900 tree array_domain_type
;
2903 current_function_decl
= NULL
;
2904 named_labels
= NULL
;
2905 current_binding_level
= NULL_BINDING_LEVEL
;
2906 free_binding_level
= NULL_BINDING_LEVEL
;
2907 pushlevel (0); /* make the binding_level structure for global names */
2908 global_binding_level
= current_binding_level
;
2910 build_common_tree_nodes (flag_signed_char
);
2912 /* Define `int' and `char' first so that dbx will output them first. */
2913 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2914 integer_type_node
));
2915 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2917 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2918 long_integer_type_node
));
2919 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2920 unsigned_type_node
));
2921 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2922 long_unsigned_type_node
));
2923 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2924 long_long_integer_type_node
));
2925 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2926 long_long_unsigned_type_node
));
2927 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2928 short_integer_type_node
));
2929 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2930 short_unsigned_type_node
));
2931 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2932 signed_char_type_node
));
2933 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2934 unsigned_char_type_node
));
2935 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2936 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2937 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2938 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2939 #if HOST_BITS_PER_WIDE_INT >= 64
2940 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intTI_type_node
));
2942 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2943 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2944 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2945 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2946 #if HOST_BITS_PER_WIDE_INT >= 64
2947 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intTI_type_node
));
2950 /* `unsigned long' is the standard type for sizeof.
2951 Traditionally, use a signed type.
2952 Note that stddef.h uses `unsigned long',
2953 and this must agree, even if long and int are the same size. */
2954 t
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2955 if (flag_traditional
&& TREE_UNSIGNED (t
))
2956 t
= signed_type (t
);
2960 /* Create the widest literal types. */
2961 widest_integer_literal_type_node
2962 = make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
2963 widest_unsigned_literal_type_node
2964 = make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
2965 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2966 widest_integer_literal_type_node
));
2967 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2968 widest_unsigned_literal_type_node
));
2970 build_common_tree_nodes_2 (flag_short_double
);
2972 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2974 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2976 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2977 long_double_type_node
));
2978 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2979 complex_integer_type_node
));
2980 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2981 complex_float_type_node
));
2982 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2983 complex_double_type_node
));
2984 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2985 complex_long_double_type_node
));
2986 pushdecl (build_decl (TYPE_DECL
,
2987 ridpointers
[(int) RID_VOID
], void_type_node
));
2989 #ifdef MD_INIT_BUILTINS
2993 wchar_type_node
= get_identifier (flag_short_wchar
2994 ? "short unsigned int"
2996 wchar_type_node
= TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node
));
2997 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
2998 signed_wchar_type_node
= signed_type (wchar_type_node
);
2999 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
3001 boolean_type_node
= integer_type_node
;
3002 boolean_true_node
= integer_one_node
;
3003 boolean_false_node
= integer_zero_node
;
3005 string_type_node
= build_pointer_type (char_type_node
);
3006 const_string_type_node
3007 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3009 /* Make a type to be the domain of a few array types
3010 whose domains don't really matter.
3011 200 is small enough that it always fits in size_t
3012 and large enough that it can hold most function names for the
3013 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3014 array_domain_type
= build_index_type (build_int_2 (200, 0));
3016 /* make a type for arrays of characters.
3017 With luck nothing will ever really depend on the length of this
3019 char_array_type_node
3020 = build_array_type (char_type_node
, array_domain_type
);
3022 /* Likewise for arrays of ints. */
3024 = build_array_type (integer_type_node
, array_domain_type
);
3026 /* This is for wide string constants. */
3027 wchar_array_type_node
3028 = build_array_type (wchar_type_node
, array_domain_type
);
3030 void_list_node
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3032 default_function_type
3033 = build_function_type (integer_type_node
, NULL_TREE
);
3035 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
3037 c_common_nodes_and_builtins (0, flag_no_builtin
, flag_no_nonansi_builtin
);
3039 endlink
= void_list_node
;
3040 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3042 = build_function_type (ptr_type_node
,
3043 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3045 /* Types which are common to the fortran compiler and libf2c. When
3046 changing these, you also need to be concerned with f/com.h. */
3048 if (TYPE_PRECISION (float_type_node
)
3049 == TYPE_PRECISION (long_integer_type_node
))
3051 g77_integer_type_node
= long_integer_type_node
;
3052 g77_uinteger_type_node
= long_unsigned_type_node
;
3054 else if (TYPE_PRECISION (float_type_node
)
3055 == TYPE_PRECISION (integer_type_node
))
3057 g77_integer_type_node
= integer_type_node
;
3058 g77_uinteger_type_node
= unsigned_type_node
;
3061 g77_integer_type_node
= g77_uinteger_type_node
= NULL_TREE
;
3063 if (g77_integer_type_node
!= NULL_TREE
)
3065 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_integer"),
3066 g77_integer_type_node
));
3067 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_uinteger"),
3068 g77_uinteger_type_node
));
3071 if (TYPE_PRECISION (float_type_node
) * 2
3072 == TYPE_PRECISION (long_integer_type_node
))
3074 g77_longint_type_node
= long_integer_type_node
;
3075 g77_ulongint_type_node
= long_unsigned_type_node
;
3077 else if (TYPE_PRECISION (float_type_node
) * 2
3078 == TYPE_PRECISION (long_long_integer_type_node
))
3080 g77_longint_type_node
= long_long_integer_type_node
;
3081 g77_ulongint_type_node
= long_long_unsigned_type_node
;
3084 g77_longint_type_node
= g77_ulongint_type_node
= NULL_TREE
;
3086 if (g77_longint_type_node
!= NULL_TREE
)
3088 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_longint"),
3089 g77_longint_type_node
));
3090 pushdecl (build_decl (TYPE_DECL
, get_identifier ("__g77_ulongint"),
3091 g77_ulongint_type_node
));
3094 builtin_function ("__builtin_aggregate_incoming_address",
3095 build_function_type (ptr_type_node
, NULL_TREE
),
3096 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
,
3097 BUILT_IN_NORMAL
, NULL_PTR
);
3099 /* Hooks for the DWARF 2 __throw routine. */
3100 builtin_function ("__builtin_unwind_init",
3101 build_function_type (void_type_node
, endlink
),
3102 BUILT_IN_UNWIND_INIT
, BUILT_IN_NORMAL
, NULL_PTR
);
3103 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void
,
3104 BUILT_IN_DWARF_CFA
, BUILT_IN_NORMAL
, NULL_PTR
);
3105 builtin_function ("__builtin_dwarf_fp_regnum",
3106 build_function_type (unsigned_type_node
, endlink
),
3107 BUILT_IN_DWARF_FP_REGNUM
, BUILT_IN_NORMAL
, NULL_PTR
);
3108 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr
,
3109 BUILT_IN_INIT_DWARF_REG_SIZES
, BUILT_IN_NORMAL
, NULL_PTR
);
3110 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3111 BUILT_IN_FROB_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3112 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3113 BUILT_IN_EXTRACT_RETURN_ADDR
, BUILT_IN_NORMAL
, NULL_PTR
);
3115 ("__builtin_eh_return",
3116 build_function_type (void_type_node
,
3117 tree_cons (NULL_TREE
, ptr_type_node
,
3118 tree_cons (NULL_TREE
,
3119 type_for_mode (ptr_mode
, 0),
3120 tree_cons (NULL_TREE
,
3123 BUILT_IN_EH_RETURN
, BUILT_IN_NORMAL
, NULL_PTR
);
3125 pedantic_lvalues
= pedantic
;
3127 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3128 make_fname_decl
= c_make_fname_decl
;
3129 declare_function_name ();
3131 start_identifier_warnings ();
3133 /* Prepare to check format strings against argument lists. */
3134 init_function_format_info ();
3138 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3140 /* Record our roots. */
3142 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3143 ggc_add_tree_root (&named_labels
, 1);
3144 ggc_add_tree_root (&shadowed_labels
, 1);
3145 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3146 mark_binding_level
);
3147 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3148 mark_binding_level
);
3149 ggc_add_tree_root (&static_ctors
, 1);
3150 ggc_add_tree_root (&static_dtors
, 1);
3153 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3154 decl, NAME is the initialization string and TYPE_DEP indicates whether
3155 NAME depended on the type of the function. As we don't yet implement
3156 delayed emission of static data, we mark the decl as emitted
3157 so it is not placed in the output. Anything using it must therefore pull
3158 out the STRING_CST initializer directly. This does mean that these names
3159 are string merging candidates, which C99 does not permit. */
3162 c_make_fname_decl (id
, name
, type_dep
)
3165 int type_dep ATTRIBUTE_UNUSED
;
3167 tree decl
, type
, init
;
3168 size_t length
= strlen (name
);
3170 type
= build_array_type
3171 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
3172 build_index_type (build_int_2 (length
, 0)));
3174 decl
= build_decl (VAR_DECL
, id
, type
);
3175 TREE_STATIC (decl
) = 1;
3176 TREE_READONLY (decl
) = 1;
3177 TREE_ASM_WRITTEN (decl
) = 1;
3178 DECL_SOURCE_LINE (decl
) = 0;
3179 DECL_ARTIFICIAL (decl
) = 1;
3180 DECL_IN_SYSTEM_HEADER (decl
) = 1;
3181 DECL_IGNORED_P (decl
) = 1;
3182 init
= build_string (length
+ 1, name
);
3183 TREE_TYPE (init
) = type
;
3184 DECL_INITIAL (decl
) = init
;
3185 finish_decl (pushdecl (decl
), init
, NULL_TREE
);
3190 /* Return a definition for a builtin function named NAME and whose data type
3191 is TYPE. TYPE should be a function type with argument types.
3192 FUNCTION_CODE tells later passes how to compile calls to this function.
3193 See tree.h for its possible values.
3195 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3196 the name to be called if we can't opencode the function. */
3199 builtin_function (name
, type
, function_code
, class, library_name
)
3203 enum built_in_class
class;
3204 const char *library_name
;
3206 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3207 DECL_EXTERNAL (decl
) = 1;
3208 TREE_PUBLIC (decl
) = 1;
3209 /* If -traditional, permit redefining a builtin function any way you like.
3210 (Though really, if the program redefines these functions,
3211 it probably won't work right unless compiled with -fno-builtin.) */
3212 if (flag_traditional
&& name
[0] != '_')
3213 DECL_BUILT_IN_NONANSI (decl
) = 1;
3215 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3216 make_decl_rtl (decl
, NULL_PTR
, 1);
3218 DECL_BUILT_IN_CLASS (decl
) = class;
3219 DECL_FUNCTION_CODE (decl
) = function_code
;
3221 /* Warn if a function in the namespace for users
3222 is used without an occasion to consider it declared. */
3223 if (name
[0] != '_' || name
[1] != '_')
3224 C_DECL_ANTICIPATED (decl
) = 1;
3229 /* Called when a declaration is seen that contains no names to declare.
3230 If its type is a reference to a structure, union or enum inherited
3231 from a containing scope, shadow that tag name for the current scope
3232 with a forward reference.
3233 If its type defines a new named structure or union
3234 or defines an enum, it is valid but we need not do anything here.
3235 Otherwise, it is an error. */
3238 shadow_tag (declspecs
)
3241 shadow_tag_warned (declspecs
, 0);
3245 shadow_tag_warned (declspecs
, warned
)
3248 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3255 pending_invalid_xref
= 0;
3257 /* Remove the attributes from declspecs, since they will confuse the
3259 split_specs_attrs (declspecs
, &specs
, &attrs
);
3261 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3263 register tree value
= TREE_VALUE (link
);
3264 register enum tree_code code
= TREE_CODE (value
);
3266 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3267 /* Used to test also that TYPE_SIZE (value) != 0.
3268 That caused warning for `struct foo;' at top level in the file. */
3270 register tree name
= lookup_tag_reverse (value
);
3277 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3278 /* Empty unnamed enum OK */
3280 pedwarn ("unnamed struct/union that defines no instances");
3286 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3290 t
= make_node (code
);
3297 if (!warned
&& ! in_system_header
)
3299 warning ("useless keyword or type name in empty declaration");
3306 error ("two types specified in one empty declaration");
3311 pedwarn ("empty declaration");
3315 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3318 groktypename (typename
)
3321 if (TREE_CODE (typename
) != TREE_LIST
)
3323 return grokdeclarator (TREE_VALUE (typename
),
3324 TREE_PURPOSE (typename
),
3328 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3331 groktypename_in_parm_context (typename
)
3334 if (TREE_CODE (typename
) != TREE_LIST
)
3336 return grokdeclarator (TREE_VALUE (typename
),
3337 TREE_PURPOSE (typename
),
3341 /* Decode a declarator in an ordinary declaration or data definition.
3342 This is called as soon as the type information and variable name
3343 have been parsed, before parsing the initializer if any.
3344 Here we create the ..._DECL node, fill in its type,
3345 and put it on the list of decls for the current context.
3346 The ..._DECL node is returned as the value.
3348 Exception: for arrays where the length is not specified,
3349 the type is left null, to be filled in by `finish_decl'.
3351 Function definitions do not come here; they go to start_function
3352 instead. However, external and forward declarations of functions
3353 do go through here. Structure field declarations are done by
3354 grokfield and not through here. */
3357 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3358 tree declarator
, declspecs
;
3360 tree attributes
, prefix_attributes
;
3362 register tree decl
= grokdeclarator (declarator
, declspecs
,
3363 NORMAL
, initialized
);
3366 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3367 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl
)), "main"))
3368 warning_with_decl (decl
, "`%s' is usually a function");
3371 /* Is it valid for this decl to have an initializer at all?
3372 If not, set INITIALIZED to zero, which will indirectly
3373 tell `finish_decl' to ignore the initializer once it is parsed. */
3374 switch (TREE_CODE (decl
))
3377 /* typedef foo = bar means give foo the same type as bar.
3378 We haven't parsed bar yet, so `finish_decl' will fix that up.
3379 Any other case of an initialization in a TYPE_DECL is an error. */
3380 if (pedantic
|| list_length (declspecs
) > 1)
3382 error ("typedef `%s' is initialized",
3383 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3389 error ("function `%s' is initialized like a variable",
3390 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3395 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3396 error ("parameter `%s' is initialized",
3397 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3402 /* Don't allow initializations for incomplete types
3403 except for arrays which might be completed by the initialization. */
3404 if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3406 /* A complete type is ok if size is fixed. */
3408 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3409 || C_DECL_VARIABLE_SIZE (decl
))
3411 error ("variable-sized object may not be initialized");
3415 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3417 error ("variable `%s' has initializer but incomplete type",
3418 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3421 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
3423 error ("elements of array `%s' have incomplete type",
3424 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3431 #if 0 /* Seems redundant with grokdeclarator. */
3432 if (current_binding_level
!= global_binding_level
3433 && DECL_EXTERNAL (decl
)
3434 && TREE_CODE (decl
) != FUNCTION_DECL
)
3435 warning ("declaration of `%s' has `extern' and is initialized",
3436 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3438 DECL_EXTERNAL (decl
) = 0;
3439 if (current_binding_level
== global_binding_level
)
3440 TREE_STATIC (decl
) = 1;
3442 /* Tell `pushdecl' this is an initialized decl
3443 even though we don't yet have the initializer expression.
3444 Also tell `finish_decl' it may store the real initializer. */
3445 DECL_INITIAL (decl
) = error_mark_node
;
3448 /* If this is a function declaration, write a record describing it to the
3449 prototypes file (if requested). */
3451 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3452 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3454 /* ANSI specifies that a tentative definition which is not merged with
3455 a non-tentative definition behaves exactly like a definition with an
3456 initializer equal to zero. (Section 3.7.2)
3457 -fno-common gives strict ANSI behavior. Usually you don't want it.
3458 This matters only for variables with external linkage. */
3459 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3460 DECL_COMMON (decl
) = 1;
3462 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3463 SET_DEFAULT_DECL_ATTRIBUTES (decl
, attributes
);
3466 /* Set attributes here so if duplicate decl, will have proper attributes. */
3467 decl_attributes (decl
, attributes
, prefix_attributes
);
3469 /* Add this decl to the current binding level.
3470 TEM may equal DECL or it may be a previous decl of the same name. */
3471 tem
= pushdecl (decl
);
3473 /* For a local variable, define the RTL now. */
3474 if (current_binding_level
!= global_binding_level
3475 /* But not if this is a duplicate decl
3476 and we preserved the rtl from the previous one
3477 (which may or may not happen). */
3478 && DECL_RTL (tem
) == 0)
3480 if (COMPLETE_TYPE_P (TREE_TYPE (tem
)))
3482 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3483 && DECL_INITIAL (tem
) != 0)
3490 /* Finish processing of a declaration;
3491 install its initial value.
3492 If the length of an array type is not known before,
3493 it must be determined now, from the initial value, or it is an error. */
3496 finish_decl (decl
, init
, asmspec_tree
)
3500 register tree type
= TREE_TYPE (decl
);
3501 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3504 /* If a name was specified, get the string. */
3506 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3508 /* If `start_decl' didn't like having an initialization, ignore it now. */
3510 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3512 /* Don't crash if parm is initialized. */
3513 if (TREE_CODE (decl
) == PARM_DECL
)
3516 if (ITERATOR_P (decl
))
3519 error_with_decl (decl
, "iterator has no initial value");
3521 init
= save_expr (init
);
3526 if (TREE_CODE (decl
) != TYPE_DECL
)
3527 store_init_value (decl
, init
);
3530 /* typedef foo = bar; store the type of bar as the type of foo. */
3531 TREE_TYPE (decl
) = TREE_TYPE (init
);
3532 DECL_INITIAL (decl
) = init
= 0;
3536 /* Deduce size of array from initialization, if not already known */
3538 if (TREE_CODE (type
) == ARRAY_TYPE
3539 && TYPE_DOMAIN (type
) == 0
3540 && TREE_CODE (decl
) != TYPE_DECL
)
3543 = (TREE_STATIC (decl
)
3544 /* Even if pedantic, an external linkage array
3545 may have incomplete type at first. */
3546 ? pedantic
&& !TREE_PUBLIC (decl
)
3547 : !DECL_EXTERNAL (decl
));
3549 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3551 /* Get the completed type made by complete_array_type. */
3552 type
= TREE_TYPE (decl
);
3555 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3560 error_with_decl (decl
, "array size missing in `%s'");
3561 /* If a `static' var's size isn't known,
3562 make it extern as well as static, so it does not get
3564 If it is not `static', then do not mark extern;
3565 finish_incomplete_decl will give it a default size
3566 and it will get allocated. */
3567 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3568 DECL_EXTERNAL (decl
) = 1;
3571 /* TYPE_MAX_VALUE is always one less than the number of elements
3572 in the array, because we start counting at zero. Therefore,
3573 warn only if the value is less than zero. */
3574 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3575 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3576 error_with_decl (decl
, "zero or negative size array `%s'");
3578 layout_decl (decl
, 0);
3581 if (TREE_CODE (decl
) == VAR_DECL
)
3583 if (DECL_SIZE (decl
) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3584 layout_decl (decl
, 0);
3586 if (DECL_SIZE (decl
) == 0
3587 && (TREE_STATIC (decl
)
3589 /* A static variable with an incomplete type
3590 is an error if it is initialized.
3591 Also if it is not file scope.
3592 Otherwise, let it through, but if it is not `extern'
3593 then it may cause an error message later. */
3594 /* A duplicate_decls call could have changed an extern
3595 declaration into a file scope one. This can be detected
3596 by TREE_ASM_WRITTEN being set. */
3597 (DECL_INITIAL (decl
) != 0
3598 || (DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
)))
3600 /* An automatic variable with an incomplete type
3602 !DECL_EXTERNAL (decl
)))
3604 error_with_decl (decl
, "storage size of `%s' isn't known");
3605 TREE_TYPE (decl
) = error_mark_node
;
3608 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3609 && DECL_SIZE (decl
) != 0)
3611 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3612 constant_expression_warning (DECL_SIZE (decl
));
3614 error_with_decl (decl
, "storage size of `%s' isn't constant");
3617 if (TREE_USED (type
))
3618 TREE_USED (decl
) = 1;
3621 /* If this is a function and an assembler name is specified, it isn't
3622 builtin any more. Also reset DECL_RTL so we can give it its new
3624 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3626 DECL_BUILT_IN_CLASS (decl
) = NOT_BUILT_IN
;
3627 DECL_RTL (decl
) = 0;
3628 DECL_ASSEMBLER_NAME (decl
) = get_identifier (asmspec
);
3631 /* Output the assembler code and/or RTL code for variables and functions,
3632 unless the type is an undefined structure or union.
3633 If not, it will get done when the type is completed. */
3635 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3637 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3638 maybe_objc_check_decl (decl
);
3639 rest_of_decl_compilation (decl
, asmspec
,
3640 (DECL_CONTEXT (decl
) == 0
3641 || TREE_ASM_WRITTEN (decl
)), 0);
3643 if (DECL_CONTEXT (decl
) != 0)
3645 /* Recompute the RTL of a local array now
3646 if it used to be an incomplete type. */
3648 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3650 /* If we used it already as memory, it must stay in memory. */
3651 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3652 /* If it's still incomplete now, no init will save it. */
3653 if (DECL_SIZE (decl
) == 0)
3654 DECL_INITIAL (decl
) = 0;
3657 /* Compute and store the initial value. */
3658 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3659 expand_decl_init (decl
);
3663 if (TREE_CODE (decl
) == TYPE_DECL
)
3665 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3666 maybe_objc_check_decl (decl
);
3667 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0, 0);
3670 /* At the end of a declaration, throw away any variable type sizes
3671 of types defined inside that declaration. There is no use
3672 computing them in the following function definition. */
3673 if (current_binding_level
== global_binding_level
)
3674 get_pending_sizes ();
3677 /* If DECL has a cleanup, build and return that cleanup here.
3678 This is a callback called by expand_expr. */
3681 maybe_build_cleanup (decl
)
3682 tree decl ATTRIBUTE_UNUSED
;
3684 /* There are no cleanups in C. */
3688 /* Given a parsed parameter declaration,
3689 decode it into a PARM_DECL and push that on the current binding level.
3690 Also, for the sake of forward parm decls,
3691 record the given order of parms in `parm_order'. */
3694 push_parm_decl (parm
)
3698 int old_immediate_size_expand
= immediate_size_expand
;
3699 /* Don't try computing parm sizes now -- wait till fn is called. */
3700 immediate_size_expand
= 0;
3702 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3703 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3704 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3705 TREE_PURPOSE (TREE_VALUE (parm
)));
3708 if (DECL_NAME (decl
))
3711 olddecl
= lookup_name (DECL_NAME (decl
));
3712 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3713 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3717 decl
= pushdecl (decl
);
3719 immediate_size_expand
= old_immediate_size_expand
;
3721 current_binding_level
->parm_order
3722 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3724 /* Add this decl to the current binding level. */
3725 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3728 /* Clear the given order of parms in `parm_order'.
3729 Used at start of parm list,
3730 and also at semicolon terminating forward decls. */
3735 current_binding_level
->parm_order
= NULL_TREE
;
3738 /* Make TYPE a complete type based on INITIAL_VALUE.
3739 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3740 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3743 complete_array_type (type
, initial_value
, do_default
)
3748 register tree maxindex
= NULL_TREE
;
3753 /* Note MAXINDEX is really the maximum index,
3754 one less than the size. */
3755 if (TREE_CODE (initial_value
) == STRING_CST
)
3758 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3759 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3762 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3764 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3765 maxindex
= build_int_2 (-1, -1);
3766 for (; elts
; elts
= TREE_CHAIN (elts
))
3768 if (TREE_PURPOSE (elts
))
3769 maxindex
= TREE_PURPOSE (elts
);
3771 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3772 maxindex
, integer_one_node
));
3774 maxindex
= copy_node (maxindex
);
3778 /* Make an error message unless that happened already. */
3779 if (initial_value
!= error_mark_node
)
3782 /* Prevent further error messages. */
3783 maxindex
= build_int_2 (0, 0);
3790 maxindex
= build_int_2 (0, 0);
3796 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3797 if (!TREE_TYPE (maxindex
))
3798 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3801 /* Lay out the type now that we can get the real answer. */
3808 /* Given declspecs and a declarator,
3809 determine the name and type of the object declared
3810 and construct a ..._DECL node for it.
3811 (In one case we can return a ..._TYPE node instead.
3812 For invalid input we sometimes return 0.)
3814 DECLSPECS is a chain of tree_list nodes whose value fields
3815 are the storage classes and type specifiers.
3817 DECL_CONTEXT says which syntactic context this declaration is in:
3818 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3819 FUNCDEF for a function definition. Like NORMAL but a few different
3820 error messages in each case. Return value may be zero meaning
3821 this definition is too screwy to try to parse.
3822 PARM for a parameter declaration (either within a function prototype
3823 or before a function body). Make a PARM_DECL, or return void_type_node.
3824 TYPENAME if for a typename (in a cast or sizeof).
3825 Don't make a DECL node; just return the ..._TYPE node.
3826 FIELD for a struct or union field; make a FIELD_DECL.
3827 BITFIELD for a field with specified width.
3828 INITIALIZED is 1 if the decl has an initializer.
3830 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3831 It may also be so in the PARM case, for a prototype where the
3832 argument type is specified but not the name.
3834 This function is where the complicated C meanings of `static'
3835 and `extern' are interpreted. */
3838 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
3841 enum decl_context decl_context
;
3846 tree type
= NULL_TREE
;
3851 int type_quals
= TYPE_UNQUALIFIED
;
3853 int explicit_int
= 0;
3854 int explicit_char
= 0;
3855 int defaulted_int
= 0;
3856 tree typedef_decl
= 0;
3858 tree typedef_type
= 0;
3859 int funcdef_flag
= 0;
3860 enum tree_code innermost_code
= ERROR_MARK
;
3862 int size_varies
= 0;
3863 tree decl_machine_attr
= NULL_TREE
;
3865 if (decl_context
== BITFIELD
)
3866 bitfield
= 1, decl_context
= FIELD
;
3868 if (decl_context
== FUNCDEF
)
3869 funcdef_flag
= 1, decl_context
= NORMAL
;
3871 /* Look inside a declarator for the name being declared
3872 and get it as a string, for an error message. */
3874 register tree decl
= declarator
;
3878 switch (TREE_CODE (decl
))
3883 innermost_code
= TREE_CODE (decl
);
3884 decl
= TREE_OPERAND (decl
, 0);
3887 case IDENTIFIER_NODE
:
3888 name
= IDENTIFIER_POINTER (decl
);
3899 /* A function definition's declarator must have the form of
3900 a function declarator. */
3902 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3905 /* Anything declared one level down from the top level
3906 must be one of the parameters of a function
3907 (because the body is at least two levels down). */
3909 /* If this looks like a function definition, make it one,
3910 even if it occurs where parms are expected.
3911 Then store_parm_decls will reject it and not use it as a parm. */
3912 if (decl_context
== NORMAL
&& !funcdef_flag
3913 && current_binding_level
->parm_flag
)
3914 decl_context
= PARM
;
3916 /* Look through the decl specs and record which ones appear.
3917 Some typespecs are defined as built-in typenames.
3918 Others, the ones that are modifiers of other types,
3919 are represented by bits in SPECBITS: set the bits for
3920 the modifiers that appear. Storage class keywords are also in SPECBITS.
3922 If there is a typedef name or a type, store the type in TYPE.
3923 This includes builtin typedefs such as `int'.
3925 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3926 and did not come from a user typedef.
3928 Set LONGLONG if `long' is mentioned twice. */
3930 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3933 register tree id
= TREE_VALUE (spec
);
3935 if (id
== ridpointers
[(int) RID_INT
])
3937 if (id
== ridpointers
[(int) RID_CHAR
])
3940 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3941 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
3943 if (ridpointers
[i
] == id
)
3945 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
3948 error ("`long long long' is too long for GCC");
3951 if (pedantic
&& ! in_system_header
&& warn_long_long
)
3952 pedwarn ("ANSI C does not support `long long'");
3956 else if (specbits
& (1 << i
))
3957 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3963 error ("two or more data types in declaration of `%s'", name
);
3964 /* Actual typedefs come to us as TYPE_DECL nodes. */
3965 else if (TREE_CODE (id
) == TYPE_DECL
)
3967 type
= TREE_TYPE (id
);
3968 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
3971 /* Built-in types come as identifiers. */
3972 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3974 register tree t
= lookup_name (id
);
3975 if (TREE_TYPE (t
) == error_mark_node
)
3977 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3978 error ("`%s' fails to be a typedef or built in type",
3979 IDENTIFIER_POINTER (id
));
3982 type
= TREE_TYPE (t
);
3986 else if (TREE_CODE (id
) != ERROR_MARK
)
3992 typedef_type
= type
;
3994 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3996 /* No type at all: default to `int', and set DEFAULTED_INT
3997 because it was not a user-defined typedef. */
4001 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4002 | (1 << (int) RID_SIGNED
)
4003 | (1 << (int) RID_UNSIGNED
))))
4004 /* Don't warn about typedef foo = bar. */
4005 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4006 && ! in_system_header
)
4008 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4009 and this is a function, or if -Wimplicit; prefer the former
4010 warning since it is more explicit. */
4011 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4012 warn_about_return_type
= 1;
4013 else if (warn_implicit_int
|| flag_isoc99
)
4014 warning ("type defaults to `int' in declaration of `%s'", name
);
4018 type
= integer_type_node
;
4021 /* Now process the modifiers that were specified
4022 and check for invalid combinations. */
4024 /* Long double is a special combination. */
4026 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4027 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4029 specbits
&= ~ (1 << (int) RID_LONG
);
4030 type
= long_double_type_node
;
4033 /* Check all other uses of type modifiers. */
4035 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4036 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4040 if ((specbits
& 1 << (int) RID_LONG
)
4041 && (specbits
& 1 << (int) RID_SHORT
))
4042 error ("both long and short specified for `%s'", name
);
4043 else if (((specbits
& 1 << (int) RID_LONG
)
4044 || (specbits
& 1 << (int) RID_SHORT
))
4046 error ("long or short specified with char for `%s'", name
);
4047 else if (((specbits
& 1 << (int) RID_LONG
)
4048 || (specbits
& 1 << (int) RID_SHORT
))
4049 && TREE_CODE (type
) == REAL_TYPE
)
4051 static int already
= 0;
4053 error ("long or short specified with floating type for `%s'", name
);
4054 if (! already
&& ! pedantic
)
4056 error ("the only valid combination is `long double'");
4060 else if ((specbits
& 1 << (int) RID_SIGNED
)
4061 && (specbits
& 1 << (int) RID_UNSIGNED
))
4062 error ("both signed and unsigned specified for `%s'", name
);
4063 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4064 error ("long, short, signed or unsigned invalid for `%s'", name
);
4068 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4070 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4072 if (flag_pedantic_errors
)
4077 /* Discard the type modifiers if they are invalid. */
4080 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4081 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4086 if ((specbits
& (1 << (int) RID_COMPLEX
))
4087 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4089 error ("complex invalid for `%s'", name
);
4090 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4093 /* Decide whether an integer type is signed or not.
4094 Optionally treat bitfields as signed by default. */
4095 if (specbits
& 1 << (int) RID_UNSIGNED
4096 /* Traditionally, all bitfields are unsigned. */
4097 || (bitfield
&& flag_traditional
4098 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4099 || (bitfield
&& ! flag_signed_bitfields
4100 && (explicit_int
|| defaulted_int
|| explicit_char
4101 /* A typedef for plain `int' without `signed'
4102 can be controlled just like plain `int'. */
4103 || ! (typedef_decl
!= 0
4104 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4105 && TREE_CODE (type
) != ENUMERAL_TYPE
4106 && !(specbits
& 1 << (int) RID_SIGNED
)))
4109 type
= long_long_unsigned_type_node
;
4110 else if (specbits
& 1 << (int) RID_LONG
)
4111 type
= long_unsigned_type_node
;
4112 else if (specbits
& 1 << (int) RID_SHORT
)
4113 type
= short_unsigned_type_node
;
4114 else if (type
== char_type_node
)
4115 type
= unsigned_char_type_node
;
4116 else if (typedef_decl
)
4117 type
= unsigned_type (type
);
4119 type
= unsigned_type_node
;
4121 else if ((specbits
& 1 << (int) RID_SIGNED
)
4122 && type
== char_type_node
)
4123 type
= signed_char_type_node
;
4125 type
= long_long_integer_type_node
;
4126 else if (specbits
& 1 << (int) RID_LONG
)
4127 type
= long_integer_type_node
;
4128 else if (specbits
& 1 << (int) RID_SHORT
)
4129 type
= short_integer_type_node
;
4131 if (specbits
& 1 << (int) RID_COMPLEX
)
4133 /* If we just have "complex", it is equivalent to
4134 "complex double", but if any modifiers at all are specified it is
4135 the complex form of TYPE. E.g, "complex short" is
4136 "complex short int". */
4138 if (defaulted_int
&& ! longlong
4139 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4140 | (1 << (int) RID_SIGNED
)
4141 | (1 << (int) RID_UNSIGNED
))))
4142 type
= complex_double_type_node
;
4143 else if (type
== integer_type_node
)
4144 type
= complex_integer_type_node
;
4145 else if (type
== float_type_node
)
4146 type
= complex_float_type_node
;
4147 else if (type
== double_type_node
)
4148 type
= complex_double_type_node
;
4149 else if (type
== long_double_type_node
)
4150 type
= complex_long_double_type_node
;
4152 type
= build_complex_type (type
);
4155 /* Figure out the type qualifiers for the declaration. There are
4156 two ways a declaration can become qualified. One is something
4157 like `const int i' where the `const' is explicit. Another is
4158 something like `typedef const int CI; CI i' where the type of the
4159 declaration contains the `const'. */
4160 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4161 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4162 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4163 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4165 pedwarn ("duplicate `const'");
4167 pedwarn ("duplicate `restrict'");
4169 pedwarn ("duplicate `volatile'");
4170 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4171 type
= TYPE_MAIN_VARIANT (type
);
4172 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4173 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4174 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4176 /* Warn if two storage classes are given. Default to `auto'. */
4181 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4182 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4183 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4184 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4185 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4186 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4188 /* Warn about storage classes that are invalid for certain
4189 kinds of declarations (parameters, typenames, etc.). */
4192 error ("multiple storage classes in declaration of `%s'", name
);
4193 else if (funcdef_flag
4195 & ((1 << (int) RID_REGISTER
)
4196 | (1 << (int) RID_AUTO
)
4197 | (1 << (int) RID_TYPEDEF
))))
4199 if (specbits
& 1 << (int) RID_AUTO
4200 && (pedantic
|| current_binding_level
== global_binding_level
))
4201 pedwarn ("function definition declared `auto'");
4202 if (specbits
& 1 << (int) RID_REGISTER
)
4203 error ("function definition declared `register'");
4204 if (specbits
& 1 << (int) RID_TYPEDEF
)
4205 error ("function definition declared `typedef'");
4206 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4207 | (1 << (int) RID_AUTO
));
4209 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4211 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4215 switch (decl_context
)
4218 error ("storage class specified for structure field `%s'", name
);
4221 error ("storage class specified for parameter `%s'", name
);
4224 error ("storage class specified for typename");
4227 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4228 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4229 | (1 << (int) RID_EXTERN
));
4232 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4234 /* `extern' with initialization is invalid if not at top level. */
4235 if (current_binding_level
== global_binding_level
)
4236 warning ("`%s' initialized and declared `extern'", name
);
4238 error ("`%s' has both `extern' and initializer", name
);
4240 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4241 && current_binding_level
!= global_binding_level
)
4242 error ("nested function `%s' declared `extern'", name
);
4243 else if (current_binding_level
== global_binding_level
4244 && specbits
& (1 << (int) RID_AUTO
))
4245 error ("top-level declaration of `%s' specifies `auto'", name
);
4246 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4247 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4249 error ("iterator `%s' has derived type", name
);
4250 type
= error_mark_node
;
4252 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4253 && TREE_CODE (type
) != INTEGER_TYPE
)
4255 error ("iterator `%s' has noninteger type", name
);
4256 type
= error_mark_node
;
4260 /* Now figure out the structure of the declarator proper.
4261 Descend through it, creating more complex types, until we reach
4262 the declared identifier (or NULL_TREE, in an absolute declarator). */
4264 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4266 if (type
== error_mark_node
)
4268 declarator
= TREE_OPERAND (declarator
, 0);
4272 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4273 an INDIRECT_REF (for *...),
4274 a CALL_EXPR (for ...(...)),
4275 an identifier (for the name being declared)
4276 or a null pointer (for the place in an absolute declarator
4277 where the name was omitted).
4278 For the last two cases, we have just exited the loop.
4280 At this point, TYPE is the type of elements of an array,
4281 or for a function to return, or for a pointer to point to.
4282 After this sequence of ifs, TYPE is the type of the
4283 array or function or pointer, and DECLARATOR has had its
4284 outermost layer removed. */
4286 if (TREE_CODE (declarator
) == ARRAY_REF
)
4288 register tree itype
= NULL_TREE
;
4289 register tree size
= TREE_OPERAND (declarator
, 1);
4290 /* The index is a signed object `sizetype' bits wide. */
4291 tree index_type
= signed_type (sizetype
);
4293 declarator
= TREE_OPERAND (declarator
, 0);
4295 /* Check for some types that there cannot be arrays of. */
4297 if (VOID_TYPE_P (type
))
4299 error ("declaration of `%s' as array of voids", name
);
4300 type
= error_mark_node
;
4303 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4305 error ("declaration of `%s' as array of functions", name
);
4306 type
= error_mark_node
;
4309 if (size
== error_mark_node
)
4310 type
= error_mark_node
;
4312 if (type
== error_mark_node
)
4315 /* If size was specified, set ITYPE to a range-type for that size.
4316 Otherwise, ITYPE remains null. finish_decl may figure it out
4317 from an initial value. */
4321 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4322 STRIP_TYPE_NOPS (size
);
4324 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4325 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4327 error ("size of array `%s' has non-integer type", name
);
4328 size
= integer_one_node
;
4331 if (pedantic
&& integer_zerop (size
))
4332 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4334 if (TREE_CODE (size
) == INTEGER_CST
)
4336 constant_expression_warning (size
);
4337 if (tree_int_cst_sgn (size
) < 0)
4339 error ("size of array `%s' is negative", name
);
4340 size
= integer_one_node
;
4345 /* Make sure the array size remains visibly nonconstant
4346 even if it is (eg) a const variable with known value. */
4351 if (TREE_CONSTANT (size
))
4352 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4354 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4358 /* Convert size to index_type, so that if it is a variable
4359 the computations will be done in the proper mode. */
4360 itype
= fold (build (MINUS_EXPR
, index_type
,
4361 convert (index_type
, size
),
4362 convert (index_type
, size_one_node
)));
4364 /* If that overflowed, the array is too big.
4365 ??? While a size of INT_MAX+1 technically shouldn't cause
4366 an overflow (because we subtract 1), the overflow is recorded
4367 during the conversion to index_type, before the subtraction.
4368 Handling this case seems like an unnecessary complication. */
4369 if (TREE_OVERFLOW (itype
))
4371 error ("size of array `%s' is too large", name
);
4372 type
= error_mark_node
;
4377 itype
= variable_size (itype
);
4378 itype
= build_index_type (itype
);
4381 #if 0 /* This had bad results for pointers to arrays, as in
4382 union incomplete (*foo)[4]; */
4383 /* Complain about arrays of incomplete types, except in typedefs. */
4385 if (!COMPLETE_TYPE_P (type
)
4386 /* Avoid multiple warnings for nested array types. */
4387 && TREE_CODE (type
) != ARRAY_TYPE
4388 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4389 && !C_TYPE_BEING_DEFINED (type
))
4390 warning ("array type has incomplete element type");
4393 #if 0 /* We shouldn't have a function type here at all!
4394 Functions aren't allowed as array elements. */
4395 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4396 && (constp
|| volatilep
))
4397 pedwarn ("ANSI C forbids const or volatile function types");
4400 /* Build the array type itself, then merge any constancy or
4401 volatility into the target type. We must do it in this order
4402 to ensure that the TYPE_MAIN_VARIANT field of the array type
4403 is set correctly. */
4405 type
= build_array_type (type
, itype
);
4407 type
= c_build_qualified_type (type
, type_quals
);
4409 #if 0 /* don't clear these; leave them set so that the array type
4410 or the variable is itself const or volatile. */
4411 type_quals
= TYPE_UNQUALIFIED
;
4415 C_TYPE_VARIABLE_SIZE (type
) = 1;
4417 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4421 /* Declaring a function type.
4422 Make sure we have a valid type for the function to return. */
4423 if (type
== error_mark_node
)
4428 /* Warn about some types functions can't return. */
4430 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4432 error ("`%s' declared as function returning a function", name
);
4433 type
= integer_type_node
;
4435 if (TREE_CODE (type
) == ARRAY_TYPE
)
4437 error ("`%s' declared as function returning an array", name
);
4438 type
= integer_type_node
;
4441 #ifndef TRADITIONAL_RETURN_FLOAT
4442 /* Traditionally, declaring return type float means double. */
4444 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4445 type
= double_type_node
;
4446 #endif /* TRADITIONAL_RETURN_FLOAT */
4448 /* Construct the function type and go to the next
4449 inner layer of declarator. */
4451 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4453 /* Say it's a definition
4454 only for the CALL_EXPR
4455 closest to the identifier. */
4456 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4457 /* Type qualifiers before the return type of the function
4458 qualify the return type, not the function type. */
4460 type
= c_build_qualified_type (type
, type_quals
);
4461 type_quals
= TYPE_UNQUALIFIED
;
4463 type
= build_function_type (type
, arg_types
);
4464 declarator
= TREE_OPERAND (declarator
, 0);
4466 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4467 the formal parameter list of this FUNCTION_TYPE to point to
4468 the FUNCTION_TYPE node itself. */
4473 for (link
= last_function_parm_tags
;
4475 link
= TREE_CHAIN (link
))
4476 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4479 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4481 /* Merge any constancy or volatility into the target type
4484 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4486 pedwarn ("ANSI C forbids qualified function types");
4488 type
= c_build_qualified_type (type
, type_quals
);
4489 type_quals
= TYPE_UNQUALIFIED
;
4492 type
= build_pointer_type (type
);
4494 /* Process a list of type modifier keywords
4495 (such as const or volatile) that were given inside the `*'. */
4497 if (TREE_TYPE (declarator
))
4499 register tree typemodlist
;
4505 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4506 typemodlist
= TREE_CHAIN (typemodlist
))
4508 tree qualifier
= TREE_VALUE (typemodlist
);
4510 if (qualifier
== ridpointers
[(int) RID_CONST
])
4512 else if (qualifier
== ridpointers
[(int) RID_VOLATILE
])
4514 else if (qualifier
== ridpointers
[(int) RID_RESTRICT
])
4519 error ("invalid type modifier within pointer declarator");
4523 pedwarn ("duplicate `const'");
4525 pedwarn ("duplicate `volatile'");
4527 pedwarn ("duplicate `restrict'");
4529 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4530 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4531 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4534 declarator
= TREE_OPERAND (declarator
, 0);
4541 /* Now TYPE has the actual type. */
4543 /* Did array size calculations overflow? */
4545 if (TREE_CODE (type
) == ARRAY_TYPE
4546 && COMPLETE_TYPE_P (type
)
4547 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4548 error ("size of array `%s' is too large", name
);
4550 /* If this is declaring a typedef name, return a TYPE_DECL. */
4552 if (specbits
& (1 << (int) RID_TYPEDEF
))
4555 /* Note that the grammar rejects storage classes
4556 in typenames, fields or parameters */
4557 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4559 pedwarn ("ANSI C forbids qualified function types");
4561 type
= c_build_qualified_type (type
, type_quals
);
4562 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4563 if ((specbits
& (1 << (int) RID_SIGNED
))
4564 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4565 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4569 /* Detect the case of an array type of unspecified size
4570 which came, as such, direct from a typedef name.
4571 We must copy the type, so that each identifier gets
4572 a distinct type, so that each identifier's size can be
4573 controlled separately by its own initializer. */
4575 if (type
!= 0 && typedef_type
!= 0
4576 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4577 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4579 type
= build_array_type (TREE_TYPE (type
), 0);
4581 C_TYPE_VARIABLE_SIZE (type
) = 1;
4584 /* If this is a type name (such as, in a cast or sizeof),
4585 compute the type and return it now. */
4587 if (decl_context
== TYPENAME
)
4589 /* Note that the grammar rejects storage classes
4590 in typenames, fields or parameters */
4591 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4593 pedwarn ("ANSI C forbids const or volatile function types");
4595 type
= c_build_qualified_type (type
, type_quals
);
4599 /* Aside from typedefs and type names (handle above),
4600 `void' at top level (not within pointer)
4601 is allowed only in public variables.
4602 We don't complain about parms either, but that is because
4603 a better error message can be made later. */
4605 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4606 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4607 && ((specbits
& (1 << (int) RID_EXTERN
))
4608 || (current_binding_level
== global_binding_level
4610 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4612 error ("variable or field `%s' declared void", name
);
4613 type
= integer_type_node
;
4616 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4617 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4622 if (decl_context
== PARM
)
4624 tree type_as_written
= type
;
4627 /* A parameter declared as an array of T is really a pointer to T.
4628 One declared as a function is really a pointer to a function. */
4630 if (TREE_CODE (type
) == ARRAY_TYPE
)
4632 /* Transfer const-ness of array into that of type pointed to. */
4633 type
= TREE_TYPE (type
);
4635 type
= c_build_qualified_type (type
, type_quals
);
4636 type
= build_pointer_type (type
);
4637 type_quals
= TYPE_UNQUALIFIED
;
4640 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4642 if (pedantic
&& type_quals
)
4643 pedwarn ("ANSI C forbids qualified function types");
4645 type
= c_build_qualified_type (type
, type_quals
);
4646 type
= build_pointer_type (type
);
4647 type_quals
= TYPE_UNQUALIFIED
;
4650 decl
= build_decl (PARM_DECL
, declarator
, type
);
4652 C_DECL_VARIABLE_SIZE (decl
) = 1;
4654 /* Compute the type actually passed in the parmlist,
4655 for the case where there is no prototype.
4656 (For example, shorts and chars are passed as ints.)
4657 When there is a prototype, this is overridden later. */
4659 if (type
== error_mark_node
)
4660 promoted_type
= type
;
4663 promoted_type
= simple_type_promotes_to (type
);
4664 if (! promoted_type
)
4665 promoted_type
= type
;
4668 DECL_ARG_TYPE (decl
) = promoted_type
;
4669 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4671 else if (decl_context
== FIELD
)
4673 /* Structure field. It may not be a function. */
4675 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4677 error ("field `%s' declared as a function", name
);
4678 type
= build_pointer_type (type
);
4680 else if (TREE_CODE (type
) != ERROR_MARK
4681 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4683 error ("field `%s' has incomplete type", name
);
4684 type
= error_mark_node
;
4686 /* Move type qualifiers down to element of an array. */
4687 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4689 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4691 TYPE_DOMAIN (type
));
4692 #if 0 /* Leave the field const or volatile as well. */
4693 type_quals
= TYPE_UNQUALIFIED
;
4696 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4697 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4700 C_DECL_VARIABLE_SIZE (decl
) = 1;
4702 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4704 /* Every function declaration is "external"
4705 except for those which are inside a function body
4706 in which `auto' is used.
4707 That is a case not specified by ANSI C,
4708 and we use it for forward declarations for nested functions. */
4709 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4710 || current_binding_level
== global_binding_level
);
4712 if (specbits
& (1 << (int) RID_AUTO
)
4713 && (pedantic
|| current_binding_level
== global_binding_level
))
4714 pedwarn ("invalid storage class for function `%s'", name
);
4715 if (specbits
& (1 << (int) RID_REGISTER
))
4716 error ("invalid storage class for function `%s'", name
);
4717 /* Function declaration not at top level.
4718 Storage classes other than `extern' are not allowed
4719 and `extern' makes no difference. */
4720 if (current_binding_level
!= global_binding_level
4721 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4723 pedwarn ("invalid storage class for function `%s'", name
);
4725 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4726 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4728 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4729 pedwarn ("ANSI C forbids qualified function types");
4732 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
)))
4733 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl
)))
4734 && ! DECL_IN_SYSTEM_HEADER (decl
))
4735 pedwarn ("ANSI C forbids qualified void function return type");
4737 /* GNU C interprets a `volatile void' return type to indicate
4738 that the function does not return. */
4739 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4740 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4741 warning ("`noreturn' function returns non-void value");
4744 DECL_EXTERNAL (decl
) = 1;
4745 /* Record absence of global scope for `static' or `auto'. */
4747 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4749 /* Record presence of `inline', if it is reasonable. */
4752 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4753 warning ("cannot inline function `main'");
4755 /* Assume that otherwise the function can be inlined. */
4756 DECL_INLINE (decl
) = 1;
4758 if (specbits
& (1 << (int) RID_EXTERN
))
4759 current_extern_inline
= 1;
4764 /* It's a variable. */
4765 /* An uninitialized decl with `extern' is a reference. */
4766 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4768 /* Move type qualifiers down to element of an array. */
4769 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4771 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4773 TYPE_DOMAIN (type
));
4774 #if 0 /* Leave the variable const or volatile as well. */
4775 type_quals
= TYPE_UNQUALIFIED
;
4779 decl
= build_decl (VAR_DECL
, declarator
, type
);
4781 C_DECL_VARIABLE_SIZE (decl
) = 1;
4784 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4786 DECL_EXTERNAL (decl
) = extern_ref
;
4787 /* At top level, the presence of a `static' or `register' storage
4788 class specifier, or the absence of all storage class specifiers
4789 makes this declaration a definition (perhaps tentative). Also,
4790 the absence of both `static' and `register' makes it public. */
4791 if (current_binding_level
== global_binding_level
)
4795 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4796 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4798 /* Not at top level, only `static' makes a static definition. */
4801 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4802 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4805 if (specbits
& 1 << (int) RID_ITERATOR
)
4806 ITERATOR_P (decl
) = 1;
4809 /* Record `register' declaration for warnings on &
4810 and in case doing stupid register allocation. */
4812 if (specbits
& (1 << (int) RID_REGISTER
))
4813 DECL_REGISTER (decl
) = 1;
4815 /* Record constancy and volatility. */
4816 c_apply_type_quals_to_decl (type_quals
, decl
);
4818 /* If a type has volatile components, it should be stored in memory.
4819 Otherwise, the fact that those components are volatile
4820 will be ignored, and would even crash the compiler. */
4821 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4822 mark_addressable (decl
);
4828 /* Decode the parameter-list info for a function type or function definition.
4829 The argument is the value returned by `get_parm_info' (or made in parse.y
4830 if there is an identifier list instead of a parameter decl list).
4831 These two functions are separate because when a function returns
4832 or receives functions then each is called multiple times but the order
4833 of calls is different. The last call to `grokparms' is always the one
4834 that contains the formal parameter names of a function definition.
4836 Store in `last_function_parms' a chain of the decls of parms.
4837 Also store in `last_function_parm_tags' a chain of the struct, union,
4838 and enum tags declared among the parms.
4840 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4842 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4843 a mere declaration. A nonempty identifier-list gets an error message
4844 when FUNCDEF_FLAG is zero. */
4847 grokparms (parms_info
, funcdef_flag
)
4851 tree first_parm
= TREE_CHAIN (parms_info
);
4853 last_function_parms
= TREE_PURPOSE (parms_info
);
4854 last_function_parm_tags
= TREE_VALUE (parms_info
);
4856 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4857 && !in_system_header
)
4858 warning ("function declaration isn't a prototype");
4861 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4864 pedwarn ("parameter names (without types) in function declaration");
4866 last_function_parms
= first_parm
;
4873 /* We no longer test FUNCDEF_FLAG.
4874 If the arg types are incomplete in a declaration,
4875 they must include undefined tags.
4876 These tags can never be defined in the scope of the declaration,
4877 so the types can never be completed,
4878 and no call can be compiled successfully. */
4880 /* In a fcn definition, arg types must be complete. */
4883 for (parm
= last_function_parms
, typelt
= first_parm
;
4885 parm
= TREE_CHAIN (parm
))
4886 /* Skip over any enumeration constants declared here. */
4887 if (TREE_CODE (parm
) == PARM_DECL
)
4889 /* Barf if the parameter itself has an incomplete type. */
4890 tree type
= TREE_VALUE (typelt
);
4891 if (!COMPLETE_TYPE_P (type
))
4893 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4894 error ("parameter `%s' has incomplete type",
4895 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4897 warning ("parameter has incomplete type");
4900 TREE_VALUE (typelt
) = error_mark_node
;
4901 TREE_TYPE (parm
) = error_mark_node
;
4904 #if 0 /* This has been replaced by parm_tags_warning
4905 which uses a more accurate criterion for what to warn about. */
4908 /* Now warn if is a pointer to an incomplete type. */
4909 while (TREE_CODE (type
) == POINTER_TYPE
4910 || TREE_CODE (type
) == REFERENCE_TYPE
)
4911 type
= TREE_TYPE (type
);
4912 type
= TYPE_MAIN_VARIANT (type
);
4913 if (!COMPLETE_TYPE_P (type
))
4915 if (DECL_NAME (parm
) != 0)
4916 warning ("parameter `%s' points to incomplete type",
4917 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4919 warning ("parameter points to incomplete type");
4923 typelt
= TREE_CHAIN (typelt
);
4931 /* Return a tree_list node with info on a parameter list just parsed.
4932 The TREE_PURPOSE is a chain of decls of those parms.
4933 The TREE_VALUE is a list of structure, union and enum tags defined.
4934 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4935 This tree_list node is later fed to `grokparms'.
4937 VOID_AT_END nonzero means append `void' to the end of the type-list.
4938 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4941 get_parm_info (void_at_end
)
4944 register tree decl
, t
;
4945 register tree types
= 0;
4947 tree tags
= gettags ();
4948 tree parms
= getdecls ();
4950 tree order
= current_binding_level
->parm_order
;
4952 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4953 if (void_at_end
&& parms
!= 0
4954 && TREE_CHAIN (parms
) == 0
4955 && VOID_TYPE_P (TREE_TYPE (parms
))
4956 && DECL_NAME (parms
) == 0)
4959 storedecls (NULL_TREE
);
4960 return tree_cons (NULL_TREE
, NULL_TREE
,
4961 tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
4964 /* Extract enumerator values and other non-parms declared with the parms.
4965 Likewise any forward parm decls that didn't have real parm decls. */
4966 for (decl
= parms
; decl
; )
4968 tree next
= TREE_CHAIN (decl
);
4970 if (TREE_CODE (decl
) != PARM_DECL
)
4972 TREE_CHAIN (decl
) = new_parms
;
4975 else if (TREE_ASM_WRITTEN (decl
))
4977 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
4978 TREE_CHAIN (decl
) = new_parms
;
4984 /* Put the parm decls back in the order they were in in the parm list. */
4985 for (t
= order
; t
; t
= TREE_CHAIN (t
))
4988 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
4990 TREE_CHAIN (TREE_VALUE (t
)) = 0;
4993 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
4996 /* Store the parmlist in the binding level since the old one
4997 is no longer a valid list. (We have changed the chain pointers.) */
4998 storedecls (new_parms
);
5000 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5001 /* There may also be declarations for enumerators if an enumeration
5002 type is declared among the parms. Ignore them here. */
5003 if (TREE_CODE (decl
) == PARM_DECL
)
5005 /* Since there is a prototype,
5006 args are passed in their declared types. */
5007 tree type
= TREE_TYPE (decl
);
5008 DECL_ARG_TYPE (decl
) = type
;
5009 if (PROMOTE_PROTOTYPES
5010 && (TREE_CODE (type
) == INTEGER_TYPE
5011 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5012 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5013 DECL_ARG_TYPE (decl
) = integer_type_node
;
5015 types
= tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5016 if (VOID_TYPE_P (TREE_VALUE (types
)) && ! erred
5017 && DECL_NAME (decl
) == 0)
5019 error ("`void' in parameter list must be the entire list");
5025 return tree_cons (new_parms
, tags
,
5026 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
5028 return tree_cons (new_parms
, tags
, nreverse (types
));
5031 /* At end of parameter list, warn about any struct, union or enum tags
5032 defined within. Do so because these types cannot ever become complete. */
5035 parmlist_tags_warning ()
5040 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5042 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5043 /* An anonymous union parm type is meaningful as a GNU extension.
5044 So don't warn for that. */
5045 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5047 if (TREE_PURPOSE (elt
) != 0)
5048 warning ("`%s %s' declared inside parameter list",
5049 (code
== RECORD_TYPE
? "struct"
5050 : code
== UNION_TYPE
? "union"
5052 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5054 warning ("anonymous %s declared inside parameter list",
5055 (code
== RECORD_TYPE
? "struct"
5056 : code
== UNION_TYPE
? "union"
5061 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5067 /* Get the struct, enum or union (CODE says which) with tag NAME.
5068 Define the tag as a forward-reference if it is not defined. */
5071 xref_tag (code
, name
)
5072 enum tree_code code
;
5075 /* If a cross reference is requested, look up the type
5076 already defined for this tag and return it. */
5078 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5079 /* Even if this is the wrong type of tag, return what we found.
5080 There will be an error message anyway, from pending_xref_error.
5081 If we create an empty xref just for an invalid use of the type,
5082 the main result is to create lots of superfluous error messages. */
5086 /* If no such tag is yet defined, create a forward-reference node
5087 and record it as the "definition".
5088 When a real declaration of this type is found,
5089 the forward-reference will be altered into a real type. */
5091 ref
= make_node (code
);
5092 if (code
== ENUMERAL_TYPE
)
5094 /* (In ANSI, Enums can be referred to only if already defined.) */
5096 pedwarn ("ANSI C forbids forward references to `enum' types");
5097 /* Give the type a default layout like unsigned int
5098 to avoid crashing if it does not get defined. */
5099 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5100 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5101 TREE_UNSIGNED (ref
) = 1;
5102 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5103 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5104 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5107 pushtag (name
, ref
);
5112 /* Make sure that the tag NAME is defined *in the current binding level*
5113 at least as a forward reference.
5114 CODE says which kind of tag NAME ought to be. */
5117 start_struct (code
, name
)
5118 enum tree_code code
;
5121 /* If there is already a tag defined at this binding level
5122 (as a forward reference), just return it. */
5124 register tree ref
= 0;
5127 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5128 if (ref
&& TREE_CODE (ref
) == code
)
5130 C_TYPE_BEING_DEFINED (ref
) = 1;
5131 TYPE_PACKED (ref
) = flag_pack_struct
;
5132 if (TYPE_FIELDS (ref
))
5133 error ("redefinition of `%s %s'",
5134 code
== UNION_TYPE
? "union" : "struct",
5135 IDENTIFIER_POINTER (name
));
5140 /* Otherwise create a forward-reference just so the tag is in scope. */
5142 ref
= make_node (code
);
5143 pushtag (name
, ref
);
5144 C_TYPE_BEING_DEFINED (ref
) = 1;
5145 TYPE_PACKED (ref
) = flag_pack_struct
;
5149 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5150 of a structure component, returning a FIELD_DECL node.
5151 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5153 This is done during the parsing of the struct declaration.
5154 The FIELD_DECL nodes are chained together and the lot of them
5155 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5158 grokfield (filename
, line
, declarator
, declspecs
, width
)
5159 const char *filename ATTRIBUTE_UNUSED
;
5160 int line ATTRIBUTE_UNUSED
;
5161 tree declarator
, declspecs
, width
;
5165 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5167 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5168 DECL_INITIAL (value
) = width
;
5170 maybe_objc_check_decl (value
);
5174 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5175 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5176 ATTRIBUTES are attributes to be applied to the structure. */
5179 finish_struct (t
, fieldlist
, attributes
)
5185 int toplevel
= global_binding_level
== current_binding_level
;
5187 /* If this type was previously laid out as a forward reference,
5188 make sure we lay it out again. */
5192 decl_attributes (t
, attributes
, NULL_TREE
);
5194 /* Nameless union parm types are useful as GCC extension. */
5195 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5196 /* Otherwise, warn about any struct or union def. in parmlist. */
5197 if (in_parm_level_p ())
5200 pedwarn ("%s defined inside parms",
5201 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5202 else if (! flag_traditional
)
5203 warning ("%s defined inside parms",
5204 TREE_CODE (t
) == UNION_TYPE
? "union" : "structure");
5209 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5210 if (DECL_NAME (x
) != 0)
5214 pedwarn ("%s has no %smembers",
5215 TREE_CODE (t
) == UNION_TYPE
? "union" : "struct",
5216 fieldlist
? "named " : "");
5219 /* Install struct as DECL_CONTEXT of each field decl.
5220 Also process specified field sizes,m which is found in the DECL_INITIAL.
5221 Store 0 there, except for ": 0" fields (so we can find them
5222 and delete them, below). */
5224 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5226 DECL_CONTEXT (x
) = t
;
5227 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5229 /* If any field is const, the structure type is pseudo-const. */
5230 if (TREE_READONLY (x
))
5231 C_TYPE_FIELDS_READONLY (t
) = 1;
5234 /* A field that is pseudo-const makes the structure likewise. */
5235 tree t1
= TREE_TYPE (x
);
5236 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5237 t1
= TREE_TYPE (t1
);
5238 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5239 && C_TYPE_FIELDS_READONLY (t1
))
5240 C_TYPE_FIELDS_READONLY (t
) = 1;
5243 /* Any field that is volatile means variables of this type must be
5244 treated in some ways as volatile. */
5245 if (TREE_THIS_VOLATILE (x
))
5246 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5248 /* Any field of nominal variable size implies structure is too. */
5249 if (C_DECL_VARIABLE_SIZE (x
))
5250 C_TYPE_VARIABLE_SIZE (t
) = 1;
5252 /* Detect invalid nested redefinition. */
5253 if (TREE_TYPE (x
) == t
)
5254 error ("nested redefinition of `%s'",
5255 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5257 /* Detect invalid bit-field size. */
5258 if (DECL_INITIAL (x
))
5259 STRIP_NOPS (DECL_INITIAL (x
));
5260 if (DECL_INITIAL (x
))
5262 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5263 constant_expression_warning (DECL_INITIAL (x
));
5267 "bit-field `%s' width not an integer constant");
5268 DECL_INITIAL (x
) = NULL
;
5272 /* Detect invalid bit-field type. */
5273 if (DECL_INITIAL (x
)
5274 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5275 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5277 error_with_decl (x
, "bit-field `%s' has invalid type");
5278 DECL_INITIAL (x
) = NULL
;
5281 if (DECL_INITIAL (x
) && pedantic
5282 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5283 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5284 /* Accept an enum that's equivalent to int or unsigned int. */
5285 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5286 && (TYPE_PRECISION (TREE_TYPE (x
))
5287 == TYPE_PRECISION (integer_type_node
))))
5288 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5290 /* Detect and ignore out of range field width and process valid
5292 if (DECL_INITIAL (x
))
5294 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5295 error_with_decl (x
, "negative width in bit-field `%s'");
5296 else if (0 < compare_tree_int (DECL_INITIAL (x
),
5297 TYPE_PRECISION (TREE_TYPE (x
))))
5298 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5299 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5300 error_with_decl (x
, "zero width for bit-field `%s'");
5303 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5304 unsigned HOST_WIDE_INT width
5305 = TREE_INT_CST_LOW (DECL_INITIAL (x
));
5307 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5308 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5309 TREE_UNSIGNED (TREE_TYPE (x
)))
5311 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5312 TREE_UNSIGNED (TREE_TYPE (x
))))))
5313 warning_with_decl (x
,
5314 "`%s' is narrower than values of its type");
5316 DECL_SIZE (x
) = bitsize_int (width
);
5317 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5321 /* field size 0 => force desired amount of alignment. */
5322 #ifdef EMPTY_FIELD_BOUNDARY
5323 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5325 #ifdef PCC_BITFIELD_TYPE_MATTERS
5326 if (PCC_BITFIELD_TYPE_MATTERS
)
5327 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5328 TYPE_ALIGN (TREE_TYPE (x
)));
5334 else if (TREE_TYPE (x
) != error_mark_node
)
5336 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5337 : TYPE_ALIGN (TREE_TYPE (x
)));
5339 /* Non-bit-fields are aligned for their type, except packed
5340 fields which require only BITS_PER_UNIT alignment. */
5341 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5344 DECL_INITIAL (x
) = 0;
5347 /* Delete all duplicate fields from the fieldlist */
5348 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5349 /* Anonymous fields aren't duplicates. */
5350 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5354 register tree y
= fieldlist
;
5358 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5364 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5366 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5367 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5369 else x
= TREE_CHAIN (x
);
5372 /* Now we have the nearly final fieldlist. Record it,
5373 then lay out the structure or union (including the fields). */
5375 TYPE_FIELDS (t
) = fieldlist
;
5379 /* Delete all zero-width bit-fields from the fieldlist */
5381 tree
*fieldlistp
= &fieldlist
;
5383 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5384 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5386 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5389 /* Now we have the truly final field list.
5390 Store it in this type and in the variants. */
5392 TYPE_FIELDS (t
) = fieldlist
;
5394 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5396 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5397 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5398 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5401 /* If this was supposed to be a transparent union, but we can't
5402 make it one, warn and turn off the flag. */
5403 if (TREE_CODE (t
) == UNION_TYPE
5404 && TYPE_TRANSPARENT_UNION (t
)
5405 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5407 TYPE_TRANSPARENT_UNION (t
) = 0;
5408 warning ("union cannot be made transparent");
5411 /* If this structure or union completes the type of any previous
5412 variable declaration, lay it out and output its rtl. */
5414 if (current_binding_level
->n_incomplete
!= 0)
5417 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5419 if (TREE_TYPE (decl
) == t
5420 && TREE_CODE (decl
) != TYPE_DECL
)
5422 layout_decl (decl
, 0);
5423 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5424 maybe_objc_check_decl (decl
);
5425 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5428 --current_binding_level
->n_incomplete
;
5430 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5431 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5433 tree element
= TREE_TYPE (decl
);
5434 while (TREE_CODE (element
) == ARRAY_TYPE
)
5435 element
= TREE_TYPE (element
);
5437 layout_array_type (TREE_TYPE (decl
));
5442 /* Finish debugging output for this type. */
5443 rest_of_type_compilation (t
, toplevel
);
5448 /* Lay out the type T, and its element type, and so on. */
5451 layout_array_type (t
)
5454 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5455 layout_array_type (TREE_TYPE (t
));
5459 /* Begin compiling the definition of an enumeration type.
5460 NAME is its name (or null if anonymous).
5461 Returns the type object, as yet incomplete.
5462 Also records info about it so that build_enumerator
5463 may be used to declare the individual values as they are read. */
5469 register tree enumtype
= 0;
5471 /* If this is the real definition for a previous forward reference,
5472 fill in the contents in the same object that used to be the
5473 forward reference. */
5476 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5478 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5480 enumtype
= make_node (ENUMERAL_TYPE
);
5481 pushtag (name
, enumtype
);
5484 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5486 if (TYPE_VALUES (enumtype
) != 0)
5488 /* This enum is a named one that has been declared already. */
5489 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5491 /* Completely replace its old definition.
5492 The old enumerators remain defined, however. */
5493 TYPE_VALUES (enumtype
) = 0;
5496 enum_next_value
= integer_zero_node
;
5499 if (flag_short_enums
)
5500 TYPE_PACKED (enumtype
) = 1;
5505 /* After processing and defining all the values of an enumeration type,
5506 install their decls in the enumeration type and finish it off.
5507 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5508 and ATTRIBUTES are the specified attributes.
5509 Returns ENUMTYPE. */
5512 finish_enum (enumtype
, values
, attributes
)
5517 register tree pair
, tem
;
5518 tree minnode
= 0, maxnode
= 0;
5519 int precision
, unsign
;
5520 int toplevel
= (global_binding_level
== current_binding_level
);
5522 if (in_parm_level_p ())
5523 warning ("enum defined inside parms");
5525 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5527 /* Calculate the maximum value of any enumerator in this type. */
5529 if (values
== error_mark_node
)
5530 minnode
= maxnode
= integer_zero_node
;
5533 minnode
= maxnode
= TREE_VALUE (values
);
5534 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5536 tree value
= TREE_VALUE (pair
);
5537 if (tree_int_cst_lt (maxnode
, value
))
5539 if (tree_int_cst_lt (value
, minnode
))
5544 /* Construct the final type of this enumeration. It is the same
5545 as one of the integral types - the narrowest one that fits, except
5546 that normally we only go as narrow as int - and signed iff any of
5547 the values are negative. */
5548 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5549 precision
= MAX (min_precision (minnode
, unsign
),
5550 min_precision (maxnode
, unsign
));
5551 if (!TYPE_PACKED (enumtype
))
5552 precision
= MAX (precision
, TYPE_PRECISION (integer_type_node
));
5553 if (type_for_size (precision
, unsign
) == 0)
5555 warning ("enumeration values exceed range of largest integer");
5556 precision
= TYPE_PRECISION (long_long_integer_type_node
);
5559 TYPE_MIN_VALUE (enumtype
) = minnode
;
5560 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5561 TYPE_PRECISION (enumtype
) = precision
;
5562 TREE_UNSIGNED (enumtype
) = unsign
;
5563 TYPE_SIZE (enumtype
) = 0;
5564 layout_type (enumtype
);
5566 if (values
!= error_mark_node
)
5568 /* Change the type of the enumerators to be the enum type. We
5569 need to do this irrespective of the size of the enum, for
5570 proper type checking. Replace the DECL_INITIALs of the
5571 enumerators, and the value slots of the list, with copies
5572 that have the enum type; they cannot be modified in place
5573 because they may be shared (e.g. integer_zero_node) Finally,
5574 change the purpose slots to point to the names of the decls. */
5575 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5577 tree enu
= TREE_PURPOSE (pair
);
5579 TREE_TYPE (enu
) = enumtype
;
5580 DECL_SIZE (enu
) = TYPE_SIZE (enumtype
);
5581 DECL_SIZE_UNIT (enu
) = TYPE_SIZE_UNIT (enumtype
);
5582 DECL_ALIGN (enu
) = TYPE_ALIGN (enumtype
);
5583 DECL_MODE (enu
) = TYPE_MODE (enumtype
);
5584 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5586 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5587 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5590 TYPE_VALUES (enumtype
) = values
;
5593 /* Fix up all variant types of this enum type. */
5594 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5596 if (tem
== enumtype
)
5598 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5599 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5600 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5601 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5602 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5603 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5604 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5605 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5606 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5609 /* Finish debugging output for this type. */
5610 rest_of_type_compilation (enumtype
, toplevel
);
5615 /* Build and install a CONST_DECL for one value of the
5616 current enumeration type (one that was begun with start_enum).
5617 Return a tree-list containing the CONST_DECL and its value.
5618 Assignment of sequential values by default is handled here. */
5621 build_enumerator (name
, value
)
5624 register tree decl
, type
;
5626 /* Validate and default VALUE. */
5628 /* Remove no-op casts from the value. */
5630 STRIP_TYPE_NOPS (value
);
5634 if (TREE_CODE (value
) == INTEGER_CST
)
5636 value
= default_conversion (value
);
5637 constant_expression_warning (value
);
5641 error ("enumerator value for `%s' not integer constant",
5642 IDENTIFIER_POINTER (name
));
5647 /* Default based on previous value. */
5648 /* It should no longer be possible to have NON_LVALUE_EXPR
5652 value
= enum_next_value
;
5654 error ("overflow in enumeration values");
5657 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5659 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5660 value
= integer_zero_node
;
5663 /* Set basis for default for next value. */
5664 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5665 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5667 /* Now create a declaration for the enum value name. */
5669 type
= TREE_TYPE (value
);
5670 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5671 TYPE_PRECISION (integer_type_node
)),
5673 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5674 && TREE_UNSIGNED (type
)));
5676 decl
= build_decl (CONST_DECL
, name
, type
);
5677 DECL_INITIAL (decl
) = convert (type
, value
);
5680 return tree_cons (decl
, value
, NULL_TREE
);
5683 /* Create the FUNCTION_DECL for a function definition.
5684 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5685 the declaration; they describe the function's name and the type it returns,
5686 but twisted together in a fashion that parallels the syntax of C.
5688 This function creates a binding context for the function body
5689 as well as setting up the FUNCTION_DECL in current_function_decl.
5691 Returns 1 on success. If the DECLARATOR is not suitable for a function
5692 (it defines a datum instead), we return 0, which tells
5693 yyparse to report a parse error. */
5696 start_function (declspecs
, declarator
, prefix_attributes
, attributes
)
5697 tree declarator
, declspecs
, prefix_attributes
, attributes
;
5699 tree decl1
, old_decl
;
5701 int old_immediate_size_expand
= immediate_size_expand
;
5703 current_function_returns_value
= 0; /* Assume, until we see it does. */
5704 current_function_returns_null
= 0;
5705 warn_about_return_type
= 0;
5706 current_extern_inline
= 0;
5707 c_function_varargs
= 0;
5709 shadowed_labels
= 0;
5711 /* Don't expand any sizes in the return type of the function. */
5712 immediate_size_expand
= 0;
5714 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5716 /* If the declarator is not suitable for a function definition,
5717 cause a syntax error. */
5720 immediate_size_expand
= old_immediate_size_expand
;
5724 decl_attributes (decl1
, prefix_attributes
, attributes
);
5726 announce_function (decl1
);
5728 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5730 error ("return-type is an incomplete type");
5731 /* Make it return void instead. */
5733 = build_function_type (void_type_node
,
5734 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5737 if (warn_about_return_type
)
5738 warning ("return-type defaults to `int'");
5740 /* Save the parm names or decls from this function's declarator
5741 where store_parm_decls will find them. */
5742 current_function_parms
= last_function_parms
;
5743 current_function_parm_tags
= last_function_parm_tags
;
5745 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5746 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5747 DECL_INITIAL (decl1
) = error_mark_node
;
5749 /* If this definition isn't a prototype and we had a prototype declaration
5750 before, copy the arg type info from that prototype.
5751 But not if what we had before was a builtin function. */
5752 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5753 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5754 && !DECL_BUILT_IN (old_decl
)
5755 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5756 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5757 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5759 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5760 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
5761 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
5764 /* If there is no explicit declaration, look for any out-of-scope implicit
5767 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
5769 /* Optionally warn of old-fashioned def with no previous prototype. */
5770 if (warn_strict_prototypes
5771 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5772 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5773 warning ("function declaration isn't a prototype");
5774 /* Optionally warn of any global def with no previous prototype. */
5775 else if (warn_missing_prototypes
5776 && TREE_PUBLIC (decl1
)
5777 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
5778 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5779 warning_with_decl (decl1
, "no previous prototype for `%s'");
5780 /* Optionally warn of any def with no previous prototype
5781 if the function has already been used. */
5782 else if (warn_missing_prototypes
5783 && old_decl
!= 0 && TREE_USED (old_decl
)
5784 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5785 warning_with_decl (decl1
,
5786 "`%s' was used with no prototype before its definition");
5787 /* Optionally warn of any global def with no previous declaration. */
5788 else if (warn_missing_declarations
5789 && TREE_PUBLIC (decl1
)
5791 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5792 warning_with_decl (decl1
, "no previous declaration for `%s'");
5793 /* Optionally warn of any def with no previous declaration
5794 if the function has already been used. */
5795 else if (warn_missing_declarations
5796 && old_decl
!= 0 && TREE_USED (old_decl
)
5797 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
5798 warning_with_decl (decl1
,
5799 "`%s' was used with no declaration before its definition");
5801 /* This is a definition, not a reference.
5802 So normally clear DECL_EXTERNAL.
5803 However, `extern inline' acts like a declaration
5804 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5805 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5807 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5808 SET_DEFAULT_DECL_ATTRIBUTES (decl1
, attributes
);
5811 /* This function exists in static storage.
5812 (This does not mean `static' in the C sense!) */
5813 TREE_STATIC (decl1
) = 1;
5815 /* A nested function is not global. */
5816 if (current_function_decl
!= 0)
5817 TREE_PUBLIC (decl1
) = 0;
5819 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5821 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
5826 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5827 != integer_type_node
)
5828 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
5830 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5831 args
= TREE_CHAIN (args
))
5833 tree type
= args
? TREE_VALUE (args
) : 0;
5835 if (type
== void_type_node
)
5842 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5843 pedwarn_with_decl (decl1
,
5844 "first argument of `%s' should be `int'");
5848 if (TREE_CODE (type
) != POINTER_TYPE
5849 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5850 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5852 pedwarn_with_decl (decl1
,
5853 "second argument of `%s' should be `char **'");
5857 if (TREE_CODE (type
) != POINTER_TYPE
5858 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5859 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5861 pedwarn_with_decl (decl1
,
5862 "third argument of `%s' should probably be `char **'");
5867 /* It is intentional that this message does not mention the third
5868 argument, which is warned for only pedantically, because it's
5869 blessed by mention in an appendix of the standard. */
5870 if (argct
> 0 && (argct
< 2 || argct
> 3))
5871 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
5873 if (argct
== 3 && pedantic
)
5874 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
5876 if (! TREE_PUBLIC (decl1
))
5877 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
5880 /* Record the decl so that the function name is defined.
5881 If we already have a decl for this name, and it is a FUNCTION_DECL,
5882 use the old decl. */
5884 current_function_decl
= pushdecl (decl1
);
5887 declare_parm_level (1);
5888 current_binding_level
->subblocks_tag_transparent
= 1;
5890 make_function_rtl (current_function_decl
);
5892 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5893 /* Promote the value to int before returning it. */
5894 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
5896 /* It retains unsignedness if traditional
5897 or if not really getting wider. */
5898 if (TREE_UNSIGNED (restype
)
5899 && (flag_traditional
5900 || (TYPE_PRECISION (restype
)
5901 == TYPE_PRECISION (integer_type_node
))))
5902 restype
= unsigned_type_node
;
5904 restype
= integer_type_node
;
5906 DECL_RESULT (current_function_decl
)
5907 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5909 /* If this fcn was already referenced via a block-scope `extern' decl
5910 (or an implicit decl), propagate certain information about the usage. */
5911 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5912 TREE_ADDRESSABLE (current_function_decl
) = 1;
5914 immediate_size_expand
= old_immediate_size_expand
;
5919 /* Record that this function is going to be a varargs function.
5920 This is called before store_parm_decls, which is too early
5921 to call mark_varargs directly. */
5926 c_function_varargs
= 1;
5929 /* Store the parameter declarations into the current function declaration.
5930 This is called after parsing the parameter declarations, before
5931 digesting the body of the function.
5933 For an old-style definition, modify the function's type
5934 to specify at least the number of arguments. */
5939 register tree fndecl
= current_function_decl
;
5942 /* This is either a chain of PARM_DECLs (if a prototype was used)
5943 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5944 tree specparms
= current_function_parms
;
5946 /* This is a list of types declared among parms in a prototype. */
5947 tree parmtags
= current_function_parm_tags
;
5949 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5950 register tree parmdecls
= getdecls ();
5952 /* This is a chain of any other decls that came in among the parm
5953 declarations. If a parm is declared with enum {foo, bar} x;
5954 then CONST_DECLs for foo and bar are put here. */
5957 /* Nonzero if this definition is written with a prototype. */
5960 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
5962 /* This case is when the function was defined with an ANSI prototype.
5963 The parms already have decls, so we need not do anything here
5964 except record them as in effect
5965 and complain if any redundant old-style parm decls were written. */
5976 error_with_decl (fndecl
,
5977 "parm types given both in parmlist and separately");
5978 /* Get rid of the erroneous decls; don't keep them on
5979 the list of parms, since they might not be PARM_DECLs. */
5980 for (decl
= current_binding_level
->names
;
5981 decl
; decl
= TREE_CHAIN (decl
))
5982 if (DECL_NAME (decl
))
5983 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
5984 for (link
= current_binding_level
->shadowed
;
5985 link
; link
= TREE_CHAIN (link
))
5986 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
5987 current_binding_level
->names
= 0;
5988 current_binding_level
->shadowed
= 0;
5991 specparms
= nreverse (specparms
);
5992 for (parm
= specparms
; parm
; parm
= next
)
5994 next
= TREE_CHAIN (parm
);
5995 if (TREE_CODE (parm
) == PARM_DECL
)
5997 if (DECL_NAME (parm
) == 0)
5998 error_with_decl (parm
, "parameter name omitted");
5999 else if (TREE_CODE (TREE_TYPE (parm
)) != ERROR_MARK
6000 && VOID_TYPE_P (TREE_TYPE (parm
)))
6002 error_with_decl (parm
, "parameter `%s' declared void");
6003 /* Change the type to error_mark_node so this parameter
6004 will be ignored by assign_parms. */
6005 TREE_TYPE (parm
) = error_mark_node
;
6011 /* If we find an enum constant or a type tag,
6012 put it aside for the moment. */
6013 TREE_CHAIN (parm
) = 0;
6014 others
= chainon (others
, parm
);
6018 /* Get the decls in their original chain order
6019 and record in the function. */
6020 DECL_ARGUMENTS (fndecl
) = getdecls ();
6023 /* If this function takes a variable number of arguments,
6024 add a phony parameter to the end of the parm list,
6025 to represent the position of the first unnamed argument. */
6026 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6029 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6030 /* Let's hope the address of the unnamed parm
6031 won't depend on its type. */
6032 TREE_TYPE (dummy
) = integer_type_node
;
6033 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6034 DECL_ARGUMENTS (fndecl
)
6035 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6039 /* Now pushdecl the enum constants. */
6040 for (parm
= others
; parm
; parm
= next
)
6042 next
= TREE_CHAIN (parm
);
6043 if (DECL_NAME (parm
) == 0)
6045 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6047 else if (TREE_CODE (parm
) != PARM_DECL
)
6051 storetags (chainon (parmtags
, gettags ()));
6055 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6056 each with a parm name as the TREE_VALUE.
6058 PARMDECLS is a chain of declarations for parameters.
6059 Warning! It can also contain CONST_DECLs which are not parameters
6060 but are names of enumerators of any enum types
6061 declared among the parameters.
6063 First match each formal parameter name with its declaration.
6064 Associate decls with the names and store the decls
6065 into the TREE_PURPOSE slots. */
6067 /* We use DECL_WEAK as a flag to show which parameters have been
6068 seen already since it is not used on PARM_DECL or CONST_DECL. */
6069 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6070 DECL_WEAK (parm
) = 0;
6072 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6074 register tree tail
, found
= NULL
;
6076 if (TREE_VALUE (parm
) == 0)
6078 error_with_decl (fndecl
,
6079 "parameter name missing from parameter list");
6080 TREE_PURPOSE (parm
) = 0;
6084 /* See if any of the parmdecls specifies this parm by name.
6085 Ignore any enumerator decls. */
6086 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6087 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6088 && TREE_CODE (tail
) == PARM_DECL
)
6094 /* If declaration already marked, we have a duplicate name.
6095 Complain, and don't use this decl twice. */
6096 if (found
&& DECL_WEAK (found
))
6098 error_with_decl (found
, "multiple parameters named `%s'");
6102 /* If the declaration says "void", complain and ignore it. */
6103 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6105 error_with_decl (found
, "parameter `%s' declared void");
6106 TREE_TYPE (found
) = integer_type_node
;
6107 DECL_ARG_TYPE (found
) = integer_type_node
;
6108 layout_decl (found
, 0);
6111 /* Traditionally, a parm declared float is actually a double. */
6112 if (found
&& flag_traditional
6113 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6115 TREE_TYPE (found
) = double_type_node
;
6116 DECL_ARG_TYPE (found
) = double_type_node
;
6117 layout_decl (found
, 0);
6120 /* If no declaration found, default to int. */
6123 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6125 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6126 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6127 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6129 warning_with_decl (found
, "type of `%s' defaults to `int'");
6133 TREE_PURPOSE (parm
) = found
;
6135 /* Mark this decl as "already found" */
6136 DECL_WEAK (found
) = 1;
6139 /* Put anything which is on the parmdecls chain and which is
6140 not a PARM_DECL onto the list NONPARMS. (The types of
6141 non-parm things which might appear on the list include
6142 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6143 any actual PARM_DECLs not matched with any names. */
6146 for (parm
= parmdecls
; parm
; )
6148 tree next
= TREE_CHAIN (parm
);
6149 TREE_CHAIN (parm
) = 0;
6151 if (TREE_CODE (parm
) != PARM_DECL
)
6152 nonparms
= chainon (nonparms
, parm
);
6155 /* Complain about args with incomplete types. */
6156 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6158 error_with_decl (parm
, "parameter `%s' has incomplete type");
6159 TREE_TYPE (parm
) = error_mark_node
;
6162 if (! DECL_WEAK (parm
))
6164 error_with_decl (parm
,
6165 "declaration for parameter `%s' but no such parameter");
6166 /* Pretend the parameter was not missing.
6167 This gets us to a standard state and minimizes
6168 further error messages. */
6170 = chainon (specparms
,
6171 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6178 /* Chain the declarations together in the order of the list of names. */
6179 /* Store that chain in the function decl, replacing the list of names. */
6181 DECL_ARGUMENTS (fndecl
) = 0;
6184 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6185 if (TREE_PURPOSE (parm
))
6188 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6190 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6191 last
= TREE_PURPOSE (parm
);
6192 TREE_CHAIN (last
) = 0;
6196 /* If there was a previous prototype,
6197 set the DECL_ARG_TYPE of each argument according to
6198 the type previously specified, and report any mismatches. */
6200 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6203 for (parm
= DECL_ARGUMENTS (fndecl
),
6204 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6205 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6206 != void_type_node
));
6207 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6209 if (parm
== 0 || type
== 0
6210 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6212 error ("number of arguments doesn't match prototype");
6213 error_with_file_and_line (current_function_prototype_file
,
6214 current_function_prototype_line
,
6215 "prototype declaration");
6218 /* Type for passing arg must be consistent
6219 with that declared for the arg. */
6220 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6222 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6223 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6225 /* Adjust argument to match prototype. E.g. a previous
6226 `int foo(float);' prototype causes
6227 `int foo(x) float x; {...}' to be treated like
6228 `int foo(float x) {...}'. This is particularly
6229 useful for argument types like uid_t. */
6230 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6232 if (PROMOTE_PROTOTYPES
6233 && (TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6234 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6235 && TYPE_PRECISION (TREE_TYPE (parm
))
6236 < TYPE_PRECISION (integer_type_node
))
6237 DECL_ARG_TYPE (parm
) = integer_type_node
;
6241 pedwarn ("promoted argument `%s' doesn't match prototype",
6242 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6243 warning_with_file_and_line
6244 (current_function_prototype_file
,
6245 current_function_prototype_line
,
6246 "prototype declaration");
6249 /* If -traditional, allow `int' argument to match
6250 `unsigned' prototype. */
6251 else if (! (flag_traditional
6252 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6253 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6255 error ("argument `%s' doesn't match prototype",
6256 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6257 error_with_file_and_line (current_function_prototype_file
,
6258 current_function_prototype_line
,
6259 "prototype declaration");
6263 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6266 /* Otherwise, create a prototype that would match. */
6270 tree actual
= 0, last
= 0, type
;
6272 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6274 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6276 TREE_CHAIN (last
) = type
;
6281 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6283 TREE_CHAIN (last
) = type
;
6287 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6288 of the type of this function, but we need to avoid having this
6289 affect the types of other similarly-typed functions, so we must
6290 first force the generation of an identical (but separate) type
6291 node for the relevant function type. The new node we create
6292 will be a variant of the main variant of the original function
6295 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6297 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6300 /* Now store the final chain of decls for the arguments
6301 as the decl-chain of the current lexical scope.
6302 Put the enumerators in as well, at the front so that
6303 DECL_ARGUMENTS is not modified. */
6305 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6308 /* Make sure the binding level for the top of the function body
6309 gets a BLOCK if there are any in the function.
6310 Otherwise, the dbx output is wrong. */
6312 keep_next_if_subblocks
= 1;
6314 /* ??? This might be an improvement,
6315 but needs to be thought about some more. */
6317 keep_next_level_flag
= 1;
6320 /* Write a record describing this function definition to the prototypes
6321 file (if requested). */
6323 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6325 /* Initialize the RTL code for the function. */
6327 init_function_start (fndecl
, input_filename
, lineno
);
6329 /* If this is a varargs function, inform function.c. */
6331 if (c_function_varargs
)
6334 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6336 declare_function_name ();
6338 /* Set up parameters and prepare for return, for the function. */
6340 expand_function_start (fndecl
, 0);
6342 /* If this function is `main', emit a call to `__main'
6343 to run global initializers, etc. */
6344 if (DECL_NAME (fndecl
)
6345 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6346 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6347 expand_main_function ();
6350 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6351 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6352 stands for an ellipsis in the identifier list.
6354 PARMLIST is the data returned by get_parm_info for the
6355 parmlist that follows the semicolon.
6357 We return a value of the same sort that get_parm_info returns,
6358 except that it describes the combination of identifiers and parmlist. */
6361 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6362 tree specparms
, parmlist
;
6365 register tree fndecl
= current_function_decl
;
6368 tree parmdecls
= TREE_PURPOSE (parmlist
);
6370 /* This is a chain of any other decls that came in among the parm
6371 declarations. They were separated already by get_parm_info,
6372 so we just need to keep them separate. */
6373 tree nonparms
= TREE_VALUE (parmlist
);
6377 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6378 DECL_WEAK (parm
) = 0;
6380 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6382 register tree tail
, found
= NULL
;
6384 /* See if any of the parmdecls specifies this parm by name. */
6385 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6386 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6392 /* If declaration already marked, we have a duplicate name.
6393 Complain, and don't use this decl twice. */
6394 if (found
&& DECL_WEAK (found
))
6396 error_with_decl (found
, "multiple parameters named `%s'");
6400 /* If the declaration says "void", complain and ignore it. */
6401 if (found
&& VOID_TYPE_P (TREE_TYPE (found
)))
6403 error_with_decl (found
, "parameter `%s' declared void");
6404 TREE_TYPE (found
) = integer_type_node
;
6405 DECL_ARG_TYPE (found
) = integer_type_node
;
6406 layout_decl (found
, 0);
6409 /* Traditionally, a parm declared float is actually a double. */
6410 if (found
&& flag_traditional
6411 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6413 TREE_TYPE (found
) = double_type_node
;
6414 DECL_ARG_TYPE (found
) = double_type_node
;
6415 layout_decl (found
, 0);
6418 /* If no declaration found, default to int. */
6421 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6423 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6424 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6425 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6426 error_with_decl (found
, "type of parameter `%s' is not declared");
6430 TREE_PURPOSE (parm
) = found
;
6432 /* Mark this decl as "already found". */
6433 DECL_WEAK (found
) = 1;
6436 /* Complain about any actual PARM_DECLs not matched with any names. */
6438 for (parm
= parmdecls
; parm
; )
6440 tree next
= TREE_CHAIN (parm
);
6441 TREE_CHAIN (parm
) = 0;
6443 /* Complain about args with incomplete types. */
6444 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6446 error_with_decl (parm
, "parameter `%s' has incomplete type");
6447 TREE_TYPE (parm
) = error_mark_node
;
6450 if (! DECL_WEAK (parm
))
6452 error_with_decl (parm
,
6453 "declaration for parameter `%s' but no such parameter");
6454 /* Pretend the parameter was not missing.
6455 This gets us to a standard state and minimizes
6456 further error messages. */
6458 = chainon (specparms
,
6459 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6465 /* Chain the declarations together in the order of the list of names.
6466 At the same time, build up a list of their types, in reverse order. */
6472 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6473 if (TREE_PURPOSE (parm
))
6476 parmdecls
= TREE_PURPOSE (parm
);
6478 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6479 last
= TREE_PURPOSE (parm
);
6480 TREE_CHAIN (last
) = 0;
6482 types
= tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6487 return tree_cons (parmdecls
, nonparms
,
6488 nreverse (tree_cons (NULL_TREE
, void_type_node
, types
)));
6490 return tree_cons (parmdecls
, nonparms
, nreverse (types
));
6493 /* Finish up a function declaration and compile that function
6494 all the way to assembler language output. The free the storage
6495 for the function definition.
6497 This is called after parsing the body of the function definition.
6499 NESTED is nonzero if the function being finished is nested in another. */
6502 finish_function (nested
)
6505 register tree fndecl
= current_function_decl
;
6507 /* TREE_READONLY (fndecl) = 1;
6508 This caused &foo to be of type ptr-to-const-function
6509 which then got a warning when stored in a ptr-to-function variable. */
6512 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6514 /* Must mark the RESULT_DECL as being in this function. */
6516 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6518 /* Obey `register' declarations if `setjmp' is called in this fn. */
6519 if (flag_traditional
&& current_function_calls_setjmp
)
6521 setjmp_protect (DECL_INITIAL (fndecl
));
6522 setjmp_protect_args ();
6525 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6527 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6528 != integer_type_node
)
6530 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6531 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6533 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6537 #ifdef DEFAULT_MAIN_RETURN
6538 /* Make it so that `main' always returns success by default. */
6539 DEFAULT_MAIN_RETURN
;
6544 /* Generate rtl for function exit. */
6545 expand_function_end (input_filename
, lineno
, 0);
6547 /* So we can tell if jump_optimize sets it to 1. */
6550 /* If this is a nested function, protect the local variables in the stack
6551 above us from being collected while we're compiling this function. */
6553 ggc_push_context ();
6555 /* Run the optimizers and output the assembler code for this function. */
6556 rest_of_compilation (fndecl
);
6558 /* Undo the GC context switch. */
6562 current_function_returns_null
|= can_reach_end
;
6564 if (warn_missing_noreturn
6565 && !TREE_THIS_VOLATILE (fndecl
)
6566 && !current_function_returns_null
6567 && !current_function_returns_value
)
6568 warning ("function might be possible candidate for attribute `noreturn'");
6570 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6571 warning ("`noreturn' function does return");
6572 else if (warn_return_type
&& can_reach_end
6573 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl
))))
6574 /* If this function returns non-void and control can drop through,
6576 warning ("control reaches end of non-void function");
6577 /* With just -W, complain only if function returns both with
6578 and without a value. */
6579 else if (extra_warnings
6580 && current_function_returns_value
&& current_function_returns_null
)
6581 warning ("this function may return with or without a value");
6583 /* If requested, warn about function definitions where the function will
6584 return a value (usually of some struct or union type) which itself will
6585 take up a lot of stack space. */
6587 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6589 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6591 if (ret_type
&& TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
6592 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
6595 unsigned int size_as_int
6596 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
6598 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
6599 warning_with_decl (fndecl
,
6600 "size of return value of `%s' is %u bytes",
6603 warning_with_decl (fndecl
,
6604 "size of return value of `%s' is larger than %d bytes",
6609 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6611 /* Stop pointing to the local nodes about to be freed.
6612 But DECL_INITIAL must remain nonzero so we know this
6613 was an actual function definition.
6614 For a nested function, this is done in pop_c_function_context.
6615 If rest_of_compilation set this to 0, leave it 0. */
6616 if (DECL_INITIAL (fndecl
) != 0)
6617 DECL_INITIAL (fndecl
) = error_mark_node
;
6619 DECL_ARGUMENTS (fndecl
) = 0;
6622 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6624 #ifndef ASM_OUTPUT_CONSTRUCTOR
6625 if (! flag_gnu_linker
)
6626 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6629 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6632 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6634 #ifndef ASM_OUTPUT_DESTRUCTOR
6635 if (! flag_gnu_linker
)
6636 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6639 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl
)));
6644 /* Let the error reporting routines know that we're outside a
6645 function. For a nested function, this value is used in
6646 pop_c_function_context and then reset via pop_function_context. */
6647 current_function_decl
= NULL
;
6651 /* Save and restore the variables in this file and elsewhere
6652 that keep track of the progress of compilation of the current function.
6653 Used for nested functions. */
6655 struct language_function
6658 tree shadowed_labels
;
6661 int warn_about_return_type
;
6663 struct binding_level
*binding_level
;
6666 /* Save and reinitialize the variables
6667 used during compilation of a C function. */
6670 push_c_function_context (f
)
6673 struct language_function
*p
;
6674 p
= (struct language_function
*) xmalloc (sizeof (struct language_function
));
6677 p
->named_labels
= named_labels
;
6678 p
->shadowed_labels
= shadowed_labels
;
6679 p
->returns_value
= current_function_returns_value
;
6680 p
->returns_null
= current_function_returns_null
;
6681 p
->warn_about_return_type
= warn_about_return_type
;
6682 p
->extern_inline
= current_extern_inline
;
6683 p
->binding_level
= current_binding_level
;
6686 /* Restore the variables used during compilation of a C function. */
6689 pop_c_function_context (f
)
6692 struct language_function
*p
= f
->language
;
6695 /* Bring back all the labels that were shadowed. */
6696 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
6697 if (DECL_NAME (TREE_VALUE (link
)) != 0)
6698 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
6699 = TREE_VALUE (link
);
6701 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
6703 /* Stop pointing to the local nodes about to be freed. */
6704 /* But DECL_INITIAL must remain nonzero so we know this
6705 was an actual function definition. */
6706 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6707 DECL_ARGUMENTS (current_function_decl
) = 0;
6710 named_labels
= p
->named_labels
;
6711 shadowed_labels
= p
->shadowed_labels
;
6712 current_function_returns_value
= p
->returns_value
;
6713 current_function_returns_null
= p
->returns_null
;
6714 warn_about_return_type
= p
->warn_about_return_type
;
6715 current_extern_inline
= p
->extern_inline
;
6716 current_binding_level
= p
->binding_level
;
6722 /* Mark the language specific parts of F for GC. */
6724 mark_c_function_context (f
)
6727 struct language_function
*p
= f
->language
;
6732 ggc_mark_tree (p
->shadowed_labels
);
6733 ggc_mark_tree (p
->named_labels
);
6734 mark_binding_level (&p
->binding_level
);
6737 /* integrate_decl_tree calls this function, but since we don't use the
6738 DECL_LANG_SPECIFIC field, this is a no-op. */
6741 copy_lang_decl (node
)
6742 tree node ATTRIBUTE_UNUSED
;
6746 /* Mark ARG for GC. */
6748 lang_mark_false_label_stack (arg
)
6749 struct label_node
*arg
;
6751 /* C doesn't use false_label_stack. It better be NULL. */
6756 /* Mark the language specific bits in T for GC. */
6761 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
6763 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
6764 ggc_mark_tree (i
->global_value
);
6765 ggc_mark_tree (i
->local_value
);
6766 ggc_mark_tree (i
->label_value
);
6767 ggc_mark_tree (i
->implicit_decl
);
6768 ggc_mark_tree (i
->error_locus
);
6769 ggc_mark_tree (i
->limbo_value
);
6771 else if (TYPE_P (t
) && TYPE_LANG_SPECIFIC (t
))
6772 ggc_mark (TYPE_LANG_SPECIFIC (t
));