1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL
, /* Ordinary declaration */
40 FUNCDEF
, /* Function definition */
41 PARM
, /* Declaration of parm before function body */
42 FIELD
, /* Declaration inside struct or union */
43 BITFIELD
, /* Likewise but with specified width */
44 TYPENAME
}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node
;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node
;
111 tree integer_type_node
;
112 tree long_integer_type_node
;
113 tree long_long_integer_type_node
;
115 tree short_unsigned_type_node
;
116 tree unsigned_type_node
;
117 tree long_unsigned_type_node
;
118 tree long_long_unsigned_type_node
;
120 tree boolean_type_node
;
121 tree boolean_false_node
;
122 tree boolean_true_node
;
124 tree ptrdiff_type_node
;
126 tree unsigned_char_type_node
;
127 tree signed_char_type_node
;
129 tree wchar_type_node
;
130 tree signed_wchar_type_node
;
131 tree unsigned_wchar_type_node
;
133 tree float_type_node
;
134 tree double_type_node
;
135 tree long_double_type_node
;
137 tree complex_integer_type_node
;
138 tree complex_float_type_node
;
139 tree complex_double_type_node
;
140 tree complex_long_double_type_node
;
142 tree intQI_type_node
;
143 tree intHI_type_node
;
144 tree intSI_type_node
;
145 tree intDI_type_node
;
147 tree unsigned_intQI_type_node
;
148 tree unsigned_intHI_type_node
;
149 tree unsigned_intSI_type_node
;
150 tree unsigned_intDI_type_node
;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node
, const_ptr_type_node
;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node
, const_string_type_node
;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node
;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node
;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node
;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type
;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double
, double_ftype_double_double
;
186 tree int_ftype_int
, long_ftype_long
;
187 tree float_ftype_float
;
188 tree ldouble_ftype_ldouble
;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int
, int_ftype_ptr_ptr_int
, void_ftype_ptr_int_int
;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr
, int_ftype_string_string
;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet
;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node
;
204 tree null_pointer_node
;
206 /* A node for the integer constant 1. */
208 tree integer_one_node
;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref
;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file
;
216 int pending_invalid_xref_line
;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value
;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow
;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms
;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags
;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms
;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags
;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file
;
252 static int current_function_prototype_line
;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels
;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels
;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs
;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl
;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value
;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null
;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type
;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline
;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level
*level_chain
;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent
;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent
;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks
;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level
*current_binding_level
;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level
*free_binding_level
;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level
*global_binding_level
;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag
;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks
;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level
*label_level_chain
;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors
, static_dtors
;
412 /* Forward declarations. */
414 static struct binding_level
* make_binding_level
PROTO((void));
415 static void clear_limbo_values
PROTO((tree
));
416 static int duplicate_decls
PROTO((tree
, tree
, int));
417 static char *redeclaration_error_message
PROTO((tree
, tree
));
418 static void storedecls
PROTO((tree
));
419 static void storetags
PROTO((tree
));
420 static tree lookup_tag
PROTO((enum tree_code
, tree
,
421 struct binding_level
*, int));
422 static tree lookup_tag_reverse
PROTO((tree
));
423 static tree grokdeclarator
PROTO((tree
, tree
, enum decl_context
,
425 static tree grokparms
PROTO((tree
, int));
426 static int field_decl_cmp
PROTO((const GENERIC_PTR
, const GENERIC_PTR
));
427 static void layout_array_type
PROTO((tree
));
429 /* C-specific option variables. */
431 /* Nonzero means allow type mismatches in conditional expressions;
432 just make their values `void'. */
434 int flag_cond_mismatch
;
436 /* Nonzero means give `double' the same size as `float'. */
438 int flag_short_double
;
440 /* Nonzero means don't recognize the keyword `asm'. */
444 /* Nonzero means don't recognize any builtin functions. */
448 /* Nonzero means don't recognize the non-ANSI builtin functions.
451 int flag_no_nonansi_builtin
;
453 /* Nonzero means do some things the same way PCC does. */
455 int flag_traditional
;
457 /* Nonzero means that we have builtin functions, and main is an int */
461 /* Nonzero means to allow single precision math even if we're generally
462 being traditional. */
463 int flag_allow_single_precision
= 0;
465 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
467 int flag_signed_bitfields
= 1;
468 int explicit_flag_signed_bitfields
= 0;
470 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
472 int flag_no_ident
= 0;
474 /* Nonzero means warn about implicit declarations. */
478 /* Nonzero means give string constants the type `const char *'
479 to get extra warnings from them. These warnings will be too numerous
480 to be useful, except in thoroughly ANSIfied programs. */
482 int warn_write_strings
;
484 /* Nonzero means warn about pointer casts that can drop a type qualifier
485 from the pointer target type. */
489 /* Nonzero means warn when casting a function call to a type that does
490 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
491 when there is no previous declaration of sqrt or malloc. */
493 int warn_bad_function_cast
;
495 /* Warn about traditional constructs whose meanings changed in ANSI C. */
497 int warn_traditional
;
499 /* Nonzero means warn about sizeof(function) or addition/subtraction
500 of function pointers. */
502 int warn_pointer_arith
;
504 /* Nonzero means warn for non-prototype function decls
505 or non-prototyped defs without previous prototype. */
507 int warn_strict_prototypes
;
509 /* Nonzero means warn for any global function def
510 without separate previous prototype decl. */
512 int warn_missing_prototypes
;
514 /* Nonzero means warn for any global function def
515 without separate previous decl. */
517 int warn_missing_declarations
;
519 /* Nonzero means warn about multiple (redundant) decls for the same single
520 variable or function. */
522 int warn_redundant_decls
= 0;
524 /* Nonzero means warn about extern declarations of objects not at
525 file-scope level and about *all* declarations of functions (whether
526 extern or static) not at file-scope level. Note that we exclude
527 implicit function declarations. To get warnings about those, use
530 int warn_nested_externs
= 0;
532 /* Warn about *printf or *scanf format/argument anomalies. */
536 /* Warn about a subscript that has type char. */
538 int warn_char_subscripts
= 0;
540 /* Warn if a type conversion is done that might have confusing results. */
544 /* Warn if adding () is suggested. */
546 int warn_parentheses
;
548 /* Warn if initializer is not completely bracketed. */
550 int warn_missing_braces
;
552 /* Warn if main is suspicious. */
556 /* Warn about comparison of signed and unsigned values. */
558 int warn_sign_compare
;
560 /* Nonzero means `$' can be in an identifier. */
562 #ifndef DOLLARS_IN_IDENTIFIERS
563 #define DOLLARS_IN_IDENTIFIERS 1
565 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
567 /* Decode the string P as a language-specific option for C.
568 Return 1 if it is recognized (and handle it);
569 return 0 if not recognized. */
575 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
577 flag_traditional
= 1;
578 flag_writable_strings
= 1;
580 else if (!strcmp (p
, "-fallow-single-precision"))
581 flag_allow_single_precision
= 1;
582 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
587 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
591 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
595 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
597 flag_traditional
= 0;
598 flag_writable_strings
= 0;
600 else if (!strcmp (p
, "-fdollars-in-identifiers"))
601 dollars_in_ident
= 1;
602 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
603 dollars_in_ident
= 0;
604 else if (!strcmp (p
, "-fsigned-char"))
605 flag_signed_char
= 1;
606 else if (!strcmp (p
, "-funsigned-char"))
607 flag_signed_char
= 0;
608 else if (!strcmp (p
, "-fno-signed-char"))
609 flag_signed_char
= 0;
610 else if (!strcmp (p
, "-fno-unsigned-char"))
611 flag_signed_char
= 1;
612 else if (!strcmp (p
, "-fsigned-bitfields")
613 || !strcmp (p
, "-fno-unsigned-bitfields"))
615 flag_signed_bitfields
= 1;
616 explicit_flag_signed_bitfields
= 1;
618 else if (!strcmp (p
, "-funsigned-bitfields")
619 || !strcmp (p
, "-fno-signed-bitfields"))
621 flag_signed_bitfields
= 0;
622 explicit_flag_signed_bitfields
= 1;
624 else if (!strcmp (p
, "-fshort-enums"))
625 flag_short_enums
= 1;
626 else if (!strcmp (p
, "-fno-short-enums"))
627 flag_short_enums
= 0;
628 else if (!strcmp (p
, "-fcond-mismatch"))
629 flag_cond_mismatch
= 1;
630 else if (!strcmp (p
, "-fno-cond-mismatch"))
631 flag_cond_mismatch
= 0;
632 else if (!strcmp (p
, "-fshort-double"))
633 flag_short_double
= 1;
634 else if (!strcmp (p
, "-fno-short-double"))
635 flag_short_double
= 0;
636 else if (!strcmp (p
, "-fasm"))
638 else if (!strcmp (p
, "-fno-asm"))
640 else if (!strcmp (p
, "-fbuiltin"))
642 else if (!strcmp (p
, "-fno-builtin"))
644 else if (!strcmp (p
, "-fno-ident"))
646 else if (!strcmp (p
, "-fident"))
648 else if (!strcmp (p
, "-ansi"))
649 flag_no_asm
= 1, flag_no_nonansi_builtin
= 1;
650 else if (!strcmp (p
, "-Wimplicit"))
652 else if (!strcmp (p
, "-Wno-implicit"))
654 else if (!strcmp (p
, "-Wwrite-strings"))
655 warn_write_strings
= 1;
656 else if (!strcmp (p
, "-Wno-write-strings"))
657 warn_write_strings
= 0;
658 else if (!strcmp (p
, "-Wcast-qual"))
660 else if (!strcmp (p
, "-Wno-cast-qual"))
662 else if (!strcmp (p
, "-Wbad-function-cast"))
663 warn_bad_function_cast
= 1;
664 else if (!strcmp (p
, "-Wno-bad-function-cast"))
665 warn_bad_function_cast
= 0;
666 else if (!strcmp (p
, "-Wpointer-arith"))
667 warn_pointer_arith
= 1;
668 else if (!strcmp (p
, "-Wno-pointer-arith"))
669 warn_pointer_arith
= 0;
670 else if (!strcmp (p
, "-Wstrict-prototypes"))
671 warn_strict_prototypes
= 1;
672 else if (!strcmp (p
, "-Wno-strict-prototypes"))
673 warn_strict_prototypes
= 0;
674 else if (!strcmp (p
, "-Wmissing-prototypes"))
675 warn_missing_prototypes
= 1;
676 else if (!strcmp (p
, "-Wno-missing-prototypes"))
677 warn_missing_prototypes
= 0;
678 else if (!strcmp (p
, "-Wmissing-declarations"))
679 warn_missing_declarations
= 1;
680 else if (!strcmp (p
, "-Wno-missing-declarations"))
681 warn_missing_declarations
= 0;
682 else if (!strcmp (p
, "-Wredundant-decls"))
683 warn_redundant_decls
= 1;
684 else if (!strcmp (p
, "-Wno-redundant-decls"))
685 warn_redundant_decls
= 0;
686 else if (!strcmp (p
, "-Wnested-externs"))
687 warn_nested_externs
= 1;
688 else if (!strcmp (p
, "-Wno-nested-externs"))
689 warn_nested_externs
= 0;
690 else if (!strcmp (p
, "-Wtraditional"))
691 warn_traditional
= 1;
692 else if (!strcmp (p
, "-Wno-traditional"))
693 warn_traditional
= 0;
694 else if (!strcmp (p
, "-Wformat"))
696 else if (!strcmp (p
, "-Wno-format"))
698 else if (!strcmp (p
, "-Wchar-subscripts"))
699 warn_char_subscripts
= 1;
700 else if (!strcmp (p
, "-Wno-char-subscripts"))
701 warn_char_subscripts
= 0;
702 else if (!strcmp (p
, "-Wconversion"))
704 else if (!strcmp (p
, "-Wno-conversion"))
706 else if (!strcmp (p
, "-Wparentheses"))
707 warn_parentheses
= 1;
708 else if (!strcmp (p
, "-Wno-parentheses"))
709 warn_parentheses
= 0;
710 else if (!strcmp (p
, "-Wreturn-type"))
711 warn_return_type
= 1;
712 else if (!strcmp (p
, "-Wno-return-type"))
713 warn_return_type
= 0;
714 else if (!strcmp (p
, "-Wcomment"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p
, "-Wno-comment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p
, "-Wcomments"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p
, "-Wno-comments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p
, "-Wtrigraphs"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p
, "-Wno-trigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p
, "-Wimport"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p
, "-Wno-import"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p
, "-Wmissing-braces"))
731 warn_missing_braces
= 1;
732 else if (!strcmp (p
, "-Wno-missing-braces"))
733 warn_missing_braces
= 0;
734 else if (!strcmp (p
, "-Wmain"))
736 else if (!strcmp (p
, "-Wno-main"))
738 else if (!strcmp (p
, "-Wsign-compare"))
739 warn_sign_compare
= 1;
740 else if (!strcmp (p
, "-Wno-sign-compare"))
741 warn_sign_compare
= 0;
742 else if (!strcmp (p
, "-Wall"))
744 /* We save the value of warn_uninitialized, since if they put
745 -Wuninitialized on the command line, we need to generate a
746 warning about not using it without also specifying -O. */
747 if (warn_uninitialized
!= 1)
748 warn_uninitialized
= 2;
750 warn_return_type
= 1;
754 warn_char_subscripts
= 1;
755 warn_parentheses
= 1;
756 warn_missing_braces
= 1;
757 warn_sign_compare
= 1;
758 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
759 it off only if it's not explicit. */
768 /* Hooks for print_node. */
771 print_lang_decl (file
, node
, indent
)
779 print_lang_type (file
, node
, indent
)
787 print_lang_identifier (file
, node
, indent
)
792 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
793 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
794 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
795 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
796 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
797 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
800 /* Hook called at end of compilation to assume 1 elt
801 for a top-level array decl that wasn't complete before. */
804 finish_incomplete_decl (decl
)
807 if (TREE_CODE (decl
) == VAR_DECL
)
809 tree type
= TREE_TYPE (decl
);
810 if (type
!= error_mark_node
811 && TREE_CODE (type
) == ARRAY_TYPE
812 && TYPE_DOMAIN (type
) == 0)
814 if (! DECL_EXTERNAL (decl
))
815 warning_with_decl (decl
, "array `%s' assumed to have one element");
817 complete_array_type (type
, NULL_TREE
, 1);
819 layout_decl (decl
, 0);
824 /* Create a new `struct binding_level'. */
827 struct binding_level
*
828 make_binding_level ()
831 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
834 /* Nonzero if we are currently in the global binding level. */
839 return current_binding_level
== global_binding_level
;
845 keep_next_level_flag
= 1;
848 /* Nonzero if the current level needs to have a BLOCK made. */
853 return ((current_binding_level
->keep_if_subblocks
854 && current_binding_level
->blocks
!= 0)
855 || current_binding_level
->keep
856 || current_binding_level
->names
!= 0
857 || (current_binding_level
->tags
!= 0
858 && !current_binding_level
->tag_transparent
));
861 /* Identify this binding level as a level of parameters.
862 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
863 But it turns out there is no way to pass the right value for
864 DEFINITION_FLAG, so we ignore it. */
867 declare_parm_level (definition_flag
)
870 current_binding_level
->parm_flag
= 1;
873 /* Nonzero if currently making parm declarations. */
878 return current_binding_level
->parm_flag
;
881 /* Enter a new binding level.
882 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
883 not for that of tags. */
886 pushlevel (tag_transparent
)
889 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
891 /* If this is the top level of a function,
892 just make sure that NAMED_LABELS is 0. */
894 if (current_binding_level
== global_binding_level
)
899 /* Reuse or create a struct for this binding level. */
901 if (free_binding_level
)
903 newlevel
= free_binding_level
;
904 free_binding_level
= free_binding_level
->level_chain
;
908 newlevel
= make_binding_level ();
911 /* Add this level to the front of the chain (stack) of levels that
914 *newlevel
= clear_binding_level
;
915 newlevel
->tag_transparent
917 || (current_binding_level
918 ? current_binding_level
->subblocks_tag_transparent
920 newlevel
->level_chain
= current_binding_level
;
921 current_binding_level
= newlevel
;
922 newlevel
->keep
= keep_next_level_flag
;
923 keep_next_level_flag
= 0;
924 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
925 keep_next_if_subblocks
= 0;
928 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
931 clear_limbo_values (block
)
936 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
937 if (DECL_NAME (tem
) != 0)
938 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
940 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
941 clear_limbo_values (tem
);
944 /* Exit a binding level.
945 Pop the level off, and restore the state of the identifier-decl mappings
946 that were in effect when this level was entered.
948 If KEEP is nonzero, this level had explicit declarations, so
949 and create a "block" (a BLOCK node) for the level
950 to record its declarations and subblocks for symbol table output.
952 If FUNCTIONBODY is nonzero, this level is the body of a function,
953 so create a block as if KEEP were set and also clear out all
956 If REVERSE is nonzero, reverse the order of decls before putting
957 them into the BLOCK. */
960 poplevel (keep
, reverse
, functionbody
)
966 /* The chain of decls was accumulated in reverse order.
967 Put it into forward order, just for cleanliness. */
969 tree tags
= current_binding_level
->tags
;
970 tree subblocks
= current_binding_level
->blocks
;
973 int block_previously_created
;
975 keep
|= current_binding_level
->keep
;
977 /* This warning is turned off because it causes warnings for
978 declarations like `extern struct foo *x'. */
980 /* Warn about incomplete structure types in this level. */
981 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
982 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
984 tree type
= TREE_VALUE (link
);
986 switch (TREE_CODE (type
))
989 errmsg
= "`struct %s' incomplete in scope ending here";
992 errmsg
= "`union %s' incomplete in scope ending here";
995 errmsg
= "`enum %s' incomplete in scope ending here";
998 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
999 error (errmsg
, IDENTIFIER_POINTER (TYPE_NAME (type
)));
1001 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1002 error (errmsg
, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
))));
1006 /* Get the decls in the order they were written.
1007 Usually current_binding_level->names is in reverse order.
1008 But parameter decls were previously put in forward order. */
1011 current_binding_level
->names
1012 = decls
= nreverse (current_binding_level
->names
);
1014 decls
= current_binding_level
->names
;
1016 /* Output any nested inline functions within this block
1017 if they weren't already output. */
1019 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1020 if (TREE_CODE (decl
) == FUNCTION_DECL
1021 && ! TREE_ASM_WRITTEN (decl
)
1022 && DECL_INITIAL (decl
) != 0
1023 && TREE_ADDRESSABLE (decl
))
1025 /* If this decl was copied from a file-scope decl
1026 on account of a block-scope extern decl,
1027 propagate TREE_ADDRESSABLE to the file-scope decl.
1029 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1030 true, since then the decl goes through save_for_inline_copying. */
1031 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1032 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1033 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1034 else if (DECL_SAVED_INSNS (decl
) != 0)
1036 push_function_context ();
1037 output_inline_function (decl
);
1038 pop_function_context ();
1042 /* If there were any declarations or structure tags in that level,
1043 or if this level is a function body,
1044 create a BLOCK to record them for the life of this function. */
1047 block_previously_created
= (current_binding_level
->this_block
!= 0);
1048 if (block_previously_created
)
1049 block
= current_binding_level
->this_block
;
1050 else if (keep
|| functionbody
1051 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1052 block
= make_node (BLOCK
);
1055 BLOCK_VARS (block
) = decls
;
1056 BLOCK_TYPE_TAGS (block
) = tags
;
1057 BLOCK_SUBBLOCKS (block
) = subblocks
;
1058 remember_end_note (block
);
1061 /* In each subblock, record that this is its superior. */
1063 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1064 BLOCK_SUPERCONTEXT (link
) = block
;
1066 /* Clear out the meanings of the local variables of this level. */
1068 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1070 if (DECL_NAME (link
) != 0)
1072 /* If the ident. was used or addressed via a local extern decl,
1073 don't forget that fact. */
1074 if (DECL_EXTERNAL (link
))
1076 if (TREE_USED (link
))
1077 TREE_USED (DECL_NAME (link
)) = 1;
1078 if (TREE_ADDRESSABLE (link
))
1079 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1081 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1085 /* Restore all name-meanings of the outer levels
1086 that were shadowed by this level. */
1088 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1089 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1091 /* If the level being exited is the top level of a function,
1092 check over all the labels, and clear out the current
1093 (function local) meanings of their names. */
1097 clear_limbo_values (block
);
1099 /* If this is the top level block of a function,
1100 the vars are the function's parameters.
1101 Don't leave them in the BLOCK because they are
1102 found in the FUNCTION_DECL instead. */
1104 BLOCK_VARS (block
) = 0;
1106 /* Clear out the definitions of all label names,
1107 since their scopes end here,
1108 and add them to BLOCK_VARS. */
1110 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1112 register tree label
= TREE_VALUE (link
);
1114 if (DECL_INITIAL (label
) == 0)
1116 error_with_decl (label
, "label `%s' used but not defined");
1117 /* Avoid crashing later. */
1118 define_label (input_filename
, lineno
,
1121 else if (warn_unused
&& !TREE_USED (label
))
1122 warning_with_decl (label
, "label `%s' defined but not used");
1123 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1125 /* Put the labels into the "variables" of the
1126 top-level block, so debugger can see them. */
1127 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1128 BLOCK_VARS (block
) = label
;
1132 /* Pop the current level, and free the structure for reuse. */
1135 register struct binding_level
*level
= current_binding_level
;
1136 current_binding_level
= current_binding_level
->level_chain
;
1138 level
->level_chain
= free_binding_level
;
1139 free_binding_level
= level
;
1142 /* Dispose of the block that we just made inside some higher level. */
1144 DECL_INITIAL (current_function_decl
) = block
;
1147 if (!block_previously_created
)
1148 current_binding_level
->blocks
1149 = chainon (current_binding_level
->blocks
, block
);
1151 /* If we did not make a block for the level just exited,
1152 any blocks made for inner levels
1153 (since they cannot be recorded as subblocks in that level)
1154 must be carried forward so they will later become subblocks
1155 of something else. */
1157 current_binding_level
->blocks
1158 = chainon (current_binding_level
->blocks
, subblocks
);
1160 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1161 binding contour so that they point to the appropriate construct, i.e.
1162 either to the current FUNCTION_DECL node, or else to the BLOCK node
1163 we just constructed.
1165 Note that for tagged types whose scope is just the formal parameter
1166 list for some function type specification, we can't properly set
1167 their TYPE_CONTEXTs here, because we don't have a pointer to the
1168 appropriate FUNCTION_TYPE node readily available to us. For those
1169 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1170 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1171 node which will represent the "scope" for these "parameter list local"
1176 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1177 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1179 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1180 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1183 TREE_USED (block
) = 1;
1187 /* Delete the node BLOCK from the current binding level.
1188 This is used for the block inside a stmt expr ({...})
1189 so that the block can be reinserted where appropriate. */
1192 delete_block (block
)
1196 if (current_binding_level
->blocks
== block
)
1197 current_binding_level
->blocks
= TREE_CHAIN (block
);
1198 for (t
= current_binding_level
->blocks
; t
;)
1200 if (TREE_CHAIN (t
) == block
)
1201 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1205 TREE_CHAIN (block
) = NULL
;
1206 /* Clear TREE_USED which is always set by poplevel.
1207 The flag is set again if insert_block is called. */
1208 TREE_USED (block
) = 0;
1211 /* Insert BLOCK at the end of the list of subblocks of the
1212 current binding level. This is used when a BIND_EXPR is expanded,
1213 to handle the BLOCK node inside the BIND_EXPR. */
1216 insert_block (block
)
1219 TREE_USED (block
) = 1;
1220 current_binding_level
->blocks
1221 = chainon (current_binding_level
->blocks
, block
);
1224 /* Set the BLOCK node for the innermost scope
1225 (the one we are currently in). */
1229 register tree block
;
1231 current_binding_level
->this_block
= block
;
1237 register struct binding_level
*newlevel
;
1239 /* Reuse or create a struct for this binding level. */
1241 if (free_binding_level
)
1243 newlevel
= free_binding_level
;
1244 free_binding_level
= free_binding_level
->level_chain
;
1248 newlevel
= make_binding_level ();
1251 /* Add this level to the front of the chain (stack) of label levels. */
1253 newlevel
->level_chain
= label_level_chain
;
1254 label_level_chain
= newlevel
;
1256 newlevel
->names
= named_labels
;
1257 newlevel
->shadowed
= shadowed_labels
;
1259 shadowed_labels
= 0;
1265 register struct binding_level
*level
= label_level_chain
;
1268 /* Clear out the definitions of the declared labels in this level.
1269 Leave in the list any ordinary, non-declared labels. */
1270 for (link
= named_labels
, prev
= 0; link
;)
1272 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1274 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1276 error_with_decl (TREE_VALUE (link
),
1277 "label `%s' used but not defined");
1278 /* Avoid crashing later. */
1279 define_label (input_filename
, lineno
,
1280 DECL_NAME (TREE_VALUE (link
)));
1282 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1283 warning_with_decl (TREE_VALUE (link
),
1284 "label `%s' defined but not used");
1285 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1287 /* Delete this element from the list. */
1288 link
= TREE_CHAIN (link
);
1290 TREE_CHAIN (prev
) = link
;
1292 named_labels
= link
;
1297 link
= TREE_CHAIN (link
);
1301 /* Bring back all the labels that were shadowed. */
1302 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1303 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1304 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1305 = TREE_VALUE (link
);
1307 named_labels
= chainon (named_labels
, level
->names
);
1308 shadowed_labels
= level
->shadowed
;
1310 /* Pop the current level, and free the structure for reuse. */
1311 label_level_chain
= label_level_chain
->level_chain
;
1312 level
->level_chain
= free_binding_level
;
1313 free_binding_level
= level
;
1316 /* Push a definition or a declaration of struct, union or enum tag "name".
1317 "type" should be the type node.
1318 We assume that the tag "name" is not already defined.
1320 Note that the definition may really be just a forward reference.
1321 In that case, the TYPE_SIZE will be zero. */
1324 pushtag (name
, type
)
1327 register struct binding_level
*b
;
1329 /* Find the proper binding level for this type tag. */
1331 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1336 /* Record the identifier as the type's name if it has none. */
1338 if (TYPE_NAME (type
) == 0)
1339 TYPE_NAME (type
) = name
;
1342 if (b
== global_binding_level
)
1343 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1345 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1347 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1348 tagged type we just added to the current binding level. This fake
1349 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1350 to output a representation of a tagged type, and it also gives
1351 us a convenient place to record the "scope start" address for the
1354 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1356 /* An approximation for now, so we can tell this is a function-scope tag.
1357 This will be updated in poplevel. */
1358 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1361 /* Handle when a new declaration NEWDECL
1362 has the same name as an old one OLDDECL
1363 in the same binding contour.
1364 Prints an error message if appropriate.
1366 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1367 Otherwise, return 0.
1369 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1370 and OLDDECL is in an outer binding level and should thus not be changed. */
1373 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1374 register tree newdecl
, olddecl
;
1375 int different_binding_level
;
1377 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1378 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1379 && DECL_INITIAL (newdecl
) != 0);
1380 tree oldtype
= TREE_TYPE (olddecl
);
1381 tree newtype
= TREE_TYPE (newdecl
);
1384 if (TREE_CODE_CLASS (TREE_CODE (olddecl
)) == 'd')
1385 DECL_MACHINE_ATTRIBUTES (newdecl
) = DECL_MACHINE_ATTRIBUTES (olddecl
);
1387 if (TREE_CODE (newtype
) == ERROR_MARK
1388 || TREE_CODE (oldtype
) == ERROR_MARK
)
1391 /* New decl is completely inconsistent with the old one =>
1392 tell caller to replace the old one.
1393 This is always an error except in the case of shadowing a builtin. */
1394 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1396 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1397 && (DECL_BUILT_IN (olddecl
)
1398 || DECL_BUILT_IN_NONANSI (olddecl
)))
1400 /* If you declare a built-in or predefined function name as static,
1401 the old definition is overridden,
1402 but optionally warn this was a bad choice of name. */
1403 if (!TREE_PUBLIC (newdecl
))
1407 else if (DECL_BUILT_IN (olddecl
))
1408 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1410 warning_with_decl (newdecl
, "shadowing library function `%s'");
1412 /* Likewise, if the built-in is not ansi, then programs can
1413 override it even globally without an error. */
1414 else if (! DECL_BUILT_IN (olddecl
))
1415 warning_with_decl (newdecl
,
1416 "library function `%s' declared as non-function");
1418 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1419 warning_with_decl (newdecl
,
1420 "built-in function `%s' declared as non-function");
1422 warning_with_decl (newdecl
,
1423 "built-in function `%s' declared as non-function");
1427 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1428 error_with_decl (olddecl
, "previous declaration of `%s'");
1434 /* For real parm decl following a forward decl,
1435 return 1 so old decl will be reused. */
1436 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1437 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1440 /* The new declaration is the same kind of object as the old one.
1441 The declarations may partially match. Print warnings if they don't
1442 match enough. Ultimately, copy most of the information from the new
1443 decl to the old one, and keep using the old one. */
1445 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1446 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1447 && DECL_INITIAL (olddecl
) == 0)
1448 /* If -traditional, avoid error for redeclaring fcn
1449 after implicit decl. */
1451 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1452 && DECL_BUILT_IN (olddecl
))
1454 /* A function declaration for a built-in function. */
1455 if (!TREE_PUBLIC (newdecl
))
1457 /* If you declare a built-in function name as static, the
1458 built-in definition is overridden,
1459 but optionally warn this was a bad choice of name. */
1461 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1462 /* Discard the old built-in function. */
1465 else if (!types_match
)
1467 /* Accept the return type of the new declaration if same modes. */
1468 tree oldreturntype
= TREE_TYPE (oldtype
);
1469 tree newreturntype
= TREE_TYPE (newtype
);
1471 /* Make sure we put the new type in the same obstack as the old ones.
1472 If the old types are not both in the same obstack, use the
1474 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1475 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1478 push_obstacks_nochange ();
1479 end_temporary_allocation ();
1482 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1484 /* Function types may be shared, so we can't just modify
1485 the return type of olddecl's function type. */
1487 = build_function_type (newreturntype
,
1488 TYPE_ARG_TYPES (oldtype
));
1490 types_match
= comptypes (newtype
, trytype
);
1494 /* Accept harmless mismatch in first argument type also.
1496 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1497 && TYPE_ARG_TYPES (oldtype
) != 0
1498 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1499 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1500 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1501 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1503 /* Function types may be shared, so we can't just modify
1504 the return type of olddecl's function type. */
1506 = build_function_type (TREE_TYPE (oldtype
),
1507 tree_cons (NULL_TREE
,
1508 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1509 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1511 types_match
= comptypes (newtype
, trytype
);
1515 if (! different_binding_level
)
1516 TREE_TYPE (olddecl
) = oldtype
;
1522 /* If types don't match for a built-in, throw away the built-in. */
1523 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1527 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1528 && DECL_SOURCE_LINE (olddecl
) == 0)
1530 /* A function declaration for a predeclared function
1531 that isn't actually built in. */
1532 if (!TREE_PUBLIC (newdecl
))
1534 /* If you declare it as static, the
1535 default definition is overridden. */
1538 else if (!types_match
)
1540 /* If the types don't match, preserve volatility indication.
1541 Later on, we will discard everything else about the
1542 default declaration. */
1543 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1546 /* Permit char *foo () to match void *foo (...) if not pedantic,
1547 if one of them came from a system header file. */
1548 else if (!types_match
1549 && TREE_CODE (olddecl
) == FUNCTION_DECL
1550 && TREE_CODE (newdecl
) == FUNCTION_DECL
1551 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1552 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1553 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1554 || DECL_IN_SYSTEM_HEADER (newdecl
))
1555 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1556 && TYPE_ARG_TYPES (oldtype
) == 0
1557 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1558 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1560 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1561 && TYPE_ARG_TYPES (newtype
) == 0
1562 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1563 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1566 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1567 /* Make sure we keep void * as ret type, not char *. */
1568 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1569 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1571 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1572 we will come back here again. */
1573 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1575 else if (!types_match
1576 /* Permit char *foo (int, ...); followed by char *foo ();
1578 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1580 /* Return types must still match. */
1581 && comptypes (TREE_TYPE (oldtype
),
1582 TREE_TYPE (newtype
))
1583 && TYPE_ARG_TYPES (newtype
) == 0))
1585 error_with_decl (newdecl
, "conflicting types for `%s'");
1586 /* Check for function type mismatch
1587 involving an empty arglist vs a nonempty one. */
1588 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1589 && comptypes (TREE_TYPE (oldtype
),
1590 TREE_TYPE (newtype
))
1591 && ((TYPE_ARG_TYPES (oldtype
) == 0
1592 && DECL_INITIAL (olddecl
) == 0)
1594 (TYPE_ARG_TYPES (newtype
) == 0
1595 && DECL_INITIAL (newdecl
) == 0)))
1597 /* Classify the problem further. */
1598 register tree t
= TYPE_ARG_TYPES (oldtype
);
1600 t
= TYPE_ARG_TYPES (newtype
);
1601 for (; t
; t
= TREE_CHAIN (t
))
1603 register tree type
= TREE_VALUE (t
);
1605 if (TREE_CHAIN (t
) == 0
1606 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1608 error ("A parameter list with an ellipsis can't match");
1609 error ("an empty parameter name list declaration.");
1613 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1614 || C_PROMOTING_INTEGER_TYPE_P (type
))
1616 error ("An argument type that has a default promotion");
1617 error ("can't match an empty parameter name list declaration.");
1622 error_with_decl (olddecl
, "previous declaration of `%s'");
1626 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1629 error_with_decl (newdecl
, errmsg
);
1630 error_with_decl (olddecl
,
1631 ((DECL_INITIAL (olddecl
)
1632 && current_binding_level
== global_binding_level
)
1633 ? "`%s' previously defined here"
1634 : "`%s' previously declared here"));
1636 else if (TREE_CODE (newdecl
) == TYPE_DECL
1637 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1638 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1640 warning_with_decl (newdecl
, "redefinition of `%s'");
1643 ((DECL_INITIAL (olddecl
)
1644 && current_binding_level
== global_binding_level
)
1645 ? "`%s' previously defined here"
1646 : "`%s' previously declared here"));
1648 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1649 && DECL_INITIAL (olddecl
) != 0
1650 && TYPE_ARG_TYPES (oldtype
) == 0
1651 && TYPE_ARG_TYPES (newtype
) != 0
1652 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1654 register tree type
, parm
;
1656 /* Prototype decl follows defn w/o prototype. */
1658 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1659 type
= TYPE_ARG_TYPES (newtype
),
1661 (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) != void_type_node
1662 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
1663 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1665 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1666 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1668 errmsg
= "prototype for `%s' follows and number of arguments";
1671 /* Type for passing arg must be consistent
1672 with that declared for the arg. */
1673 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1674 /* If -traditional, allow `unsigned int' instead of `int'
1675 in the prototype. */
1676 && (! (flag_traditional
1677 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1678 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1680 errmsg
= "prototype for `%s' follows and argument %d";
1686 error_with_decl (newdecl
, errmsg
, nargs
);
1687 error_with_decl (olddecl
,
1688 "doesn't match non-prototype definition here");
1692 warning_with_decl (newdecl
, "prototype for `%s' follows");
1693 warning_with_decl (olddecl
, "non-prototype definition here");
1696 /* Warn about mismatches in various flags. */
1699 /* Warn if function is now inline
1700 but was previously declared not inline and has been called. */
1701 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1702 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1703 && TREE_USED (olddecl
))
1704 warning_with_decl (newdecl
,
1705 "`%s' declared inline after being called");
1706 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1707 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1708 && DECL_INITIAL (olddecl
) != 0)
1709 warning_with_decl (newdecl
,
1710 "`%s' declared inline after its definition");
1712 /* If pedantic, warn when static declaration follows a non-static
1713 declaration. Otherwise, do so only for functions. */
1714 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1715 && TREE_PUBLIC (olddecl
)
1716 && !TREE_PUBLIC (newdecl
))
1717 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1719 /* Warn when const declaration follows a non-const
1720 declaration, but not for functions. */
1721 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1722 && !TREE_READONLY (olddecl
)
1723 && TREE_READONLY (newdecl
))
1724 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1725 /* These bits are logically part of the type, for variables.
1726 But not for functions
1727 (where qualifiers are not valid ANSI anyway). */
1728 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1729 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1730 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1731 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1735 /* Optionally warn about more than one declaration for the same name. */
1736 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1737 /* Dont warn about a function declaration
1738 followed by a definition. */
1739 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1740 && DECL_INITIAL (olddecl
) == 0)
1741 /* Don't warn about extern decl followed by (tentative) definition. */
1742 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1744 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1745 warning_with_decl (olddecl
, "previous declaration of `%s'");
1748 /* Copy all the DECL_... slots specified in the new decl
1749 except for any that we copy here from the old type.
1751 Past this point, we don't change OLDTYPE and NEWTYPE
1752 even if we change the types of NEWDECL and OLDDECL. */
1756 /* When copying info to olddecl, we store into write_olddecl
1757 instead. This allows us to avoid modifying olddecl when
1758 different_binding_level is true. */
1759 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1761 /* Make sure we put the new type in the same obstack as the old ones.
1762 If the old types are not both in the same obstack, use the permanent
1764 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1765 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1768 push_obstacks_nochange ();
1769 end_temporary_allocation ();
1772 /* Merge the data types specified in the two decls. */
1773 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1775 if (different_binding_level
)
1777 = build_type_attribute_variant
1779 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1780 TYPE_ATTRIBUTES (oldtype
)));
1783 = TREE_TYPE (olddecl
)
1784 = common_type (newtype
, oldtype
);
1787 /* Lay the type out, unless already done. */
1788 if (oldtype
!= TREE_TYPE (newdecl
))
1790 if (TREE_TYPE (newdecl
) != error_mark_node
)
1791 layout_type (TREE_TYPE (newdecl
));
1792 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1793 && TREE_CODE (newdecl
) != TYPE_DECL
1794 && TREE_CODE (newdecl
) != CONST_DECL
)
1795 layout_decl (newdecl
, 0);
1799 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1800 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1801 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1802 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1803 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1806 /* Keep the old rtl since we can safely use it. */
1807 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1809 /* Merge the type qualifiers. */
1810 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1811 && !TREE_THIS_VOLATILE (newdecl
))
1812 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1813 if (TREE_READONLY (newdecl
))
1814 TREE_READONLY (write_olddecl
) = 1;
1815 if (TREE_THIS_VOLATILE (newdecl
))
1817 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1818 if (TREE_CODE (newdecl
) == VAR_DECL
)
1819 make_var_volatile (newdecl
);
1822 /* Keep source location of definition rather than declaration. */
1823 /* When called with different_binding_level set, keep the old
1824 information so that meaningful diagnostics can be given. */
1825 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1826 && ! different_binding_level
)
1828 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1829 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1832 /* Merge the unused-warning information. */
1833 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1834 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1835 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1836 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1838 /* Merge the initialization information. */
1839 /* When called with different_binding_level set, don't copy over
1840 DECL_INITIAL, so that we don't accidentally change function
1841 declarations into function definitions. */
1842 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1843 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1845 /* Merge the section attribute.
1846 We want to issue an error if the sections conflict but that must be
1847 done later in decl_attributes since we are called before attributes
1849 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1850 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1852 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1854 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1855 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1860 /* If cannot merge, then use the new type and qualifiers,
1861 and don't preserve the old rtl. */
1862 else if (! different_binding_level
)
1864 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1865 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1866 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1867 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1870 /* Merge the storage class information. */
1871 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1872 /* For functions, static overrides non-static. */
1873 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1875 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1876 /* This is since we don't automatically
1877 copy the attributes of NEWDECL into OLDDECL. */
1878 /* No need to worry about different_binding_level here because
1879 then TREE_PUBLIC (newdecl) was true. */
1880 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1881 /* If this clears `static', clear it in the identifier too. */
1882 if (! TREE_PUBLIC (olddecl
))
1883 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1885 if (DECL_EXTERNAL (newdecl
))
1887 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1888 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1889 /* An extern decl does not override previous storage class. */
1890 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1891 if (! DECL_EXTERNAL (newdecl
))
1892 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1896 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1897 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1900 /* If either decl says `inline', this fn is inline,
1901 unless its definition was passed already. */
1902 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1903 DECL_INLINE (olddecl
) = 1;
1904 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1906 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1908 if (DECL_BUILT_IN (olddecl
))
1910 /* Get rid of any built-in function if new arg types don't match it
1911 or if we have a function definition. */
1912 if (! types_match
|| new_is_definition
)
1914 if (! different_binding_level
)
1916 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1917 DECL_BUILT_IN (olddecl
) = 0;
1922 /* If redeclaring a builtin function, and not a definition,
1923 it stays built in. */
1924 DECL_BUILT_IN (newdecl
) = 1;
1925 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1928 /* Also preserve various other info from the definition. */
1929 else if (! new_is_definition
)
1930 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1931 if (! new_is_definition
)
1933 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1934 /* When called with different_binding_level set, don't copy over
1935 DECL_INITIAL, so that we don't accidentally change function
1936 declarations into function definitions. */
1937 if (! different_binding_level
)
1938 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1939 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1940 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1943 if (different_binding_level
)
1945 /* Don't output a duplicate symbol for this declaration. */
1946 TREE_ASM_WRITTEN (newdecl
) = 1;
1950 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1951 But preserve OLDdECL's DECL_UID. */
1953 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1955 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1956 (char *) olddecl
+ sizeof (struct tree_common
),
1957 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1958 DECL_UID (olddecl
) = olddecl_uid
;
1964 /* Record a decl-node X as belonging to the current lexical scope.
1965 Check for errors (such as an incompatible declaration for the same
1966 name already seen in the same scope).
1968 Returns either X or an old decl for the same name.
1969 If an old decl is returned, it may have been smashed
1970 to agree with what X says. */
1977 register tree name
= DECL_NAME (x
);
1978 register struct binding_level
*b
= current_binding_level
;
1980 DECL_CONTEXT (x
) = current_function_decl
;
1981 /* A local extern declaration for a function doesn't constitute nesting.
1982 A local auto declaration does, since it's a forward decl
1983 for a nested function coming later. */
1984 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
1985 && DECL_EXTERNAL (x
))
1986 DECL_CONTEXT (x
) = 0;
1988 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
1989 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
1990 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1991 && !DECL_IN_SYSTEM_HEADER (x
))
1992 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
1998 int different_binding_level
= 0;
2000 t
= lookup_name_current_level (name
);
2001 /* Don't type check externs here when -traditional. This is so that
2002 code with conflicting declarations inside blocks will get warnings
2003 not errors. X11 for instance depends on this. */
2004 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2006 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2007 /* Type decls at global scope don't conflict with externs declared
2008 inside lexical blocks. */
2009 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2011 different_binding_level
= 1;
2013 if (t
!= 0 && t
== error_mark_node
)
2014 /* error_mark_node is 0 for a while during initialization! */
2017 error_with_decl (x
, "`%s' used prior to declaration");
2022 file
= DECL_SOURCE_FILE (t
);
2023 line
= DECL_SOURCE_LINE (t
);
2026 /* If this decl is `static' and an implicit decl was seen previously,
2027 warn. But don't complain if -traditional,
2028 since traditional compilers don't complain. */
2029 if (! flag_traditional
&& TREE_PUBLIC (name
)
2030 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2031 sets this for all functions. */
2032 && ! TREE_PUBLIC (x
)
2033 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2034 /* We used to warn also for explicit extern followed by static,
2035 but sometimes you need to do it that way. */
2036 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2038 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2039 IDENTIFIER_POINTER (name
));
2040 pedwarn_with_file_and_line
2041 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2042 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2043 "previous declaration of `%s'",
2044 IDENTIFIER_POINTER (name
));
2047 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2049 if (TREE_CODE (t
) == PARM_DECL
)
2051 /* Don't allow more than one "real" duplicate
2052 of a forward parm decl. */
2053 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2059 /* If we are processing a typedef statement, generate a whole new
2060 ..._TYPE node (which will be just an variant of the existing
2061 ..._TYPE node with identical properties) and then install the
2062 TYPE_DECL node generated to represent the typedef name as the
2063 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2065 The whole point here is to end up with a situation where each
2066 and every ..._TYPE node the compiler creates will be uniquely
2067 associated with AT MOST one node representing a typedef name.
2068 This way, even though the compiler substitutes corresponding
2069 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2070 early on, later parts of the compiler can always do the reverse
2071 translation and get back the corresponding typedef name. For
2074 typedef struct S MY_TYPE;
2077 Later parts of the compiler might only know that `object' was of
2078 type `struct S' if if were not for code just below. With this
2079 code however, later parts of the compiler see something like:
2081 struct S' == struct S
2082 typedef struct S' MY_TYPE;
2085 And they can then deduce (from the node for type struct S') that
2086 the original object declaration was:
2090 Being able to do this is important for proper support of protoize,
2091 and also for generating precise symbolic debugging information
2092 which takes full account of the programmer's (typedef) vocabulary.
2094 Obviously, we don't want to generate a duplicate ..._TYPE node if
2095 the TYPE_DECL node that we are now processing really represents a
2096 standard built-in type.
2098 Since all standard types are effectively declared at line zero
2099 in the source file, we can easily check to see if we are working
2100 on a standard type by checking the current value of lineno. */
2102 if (TREE_CODE (x
) == TYPE_DECL
)
2104 if (DECL_SOURCE_LINE (x
) == 0)
2106 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2107 TYPE_NAME (TREE_TYPE (x
)) = x
;
2109 else if (TREE_TYPE (x
) != error_mark_node
)
2111 tree tt
= TREE_TYPE (x
);
2112 DECL_ORIGINAL_TYPE (x
) = tt
;
2113 tt
= build_type_copy (tt
);
2119 /* Multiple external decls of the same identifier ought to match.
2120 Check against both global declarations (when traditional) and out of
2121 scope (limbo) block level declarations.
2123 We get warnings about inline functions where they are defined.
2124 Avoid duplicate warnings where they are used. */
2125 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
))
2129 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2130 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2131 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2132 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2133 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2134 /* Decls in limbo are always extern, so no need to check that. */
2135 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2139 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2140 /* If old decl is built-in, we already warned if we should. */
2141 && !DECL_BUILT_IN (decl
))
2143 pedwarn_with_decl (x
,
2144 "type mismatch with previous external decl");
2145 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2149 /* If a function has had an implicit declaration, and then is defined,
2150 make sure they are compatible. */
2152 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2153 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2154 && TREE_CODE (x
) == FUNCTION_DECL
2155 && ! comptypes (TREE_TYPE (x
),
2156 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2158 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2159 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2160 "previous implicit declaration of `%s'");
2163 /* In PCC-compatibility mode, extern decls of vars with no current decl
2164 take effect at top level no matter where they are. */
2165 if (flag_traditional
&& DECL_EXTERNAL (x
)
2166 && lookup_name (name
) == 0)
2168 tree type
= TREE_TYPE (x
);
2170 /* But don't do this if the type contains temporary nodes. */
2173 if (type
== error_mark_node
)
2175 if (! TREE_PERMANENT (type
))
2177 warning_with_decl (x
, "type of external `%s' is not global");
2178 /* By exiting the loop early, we leave TYPE nonzero,
2179 and thus prevent globalization of the decl. */
2182 else if (TREE_CODE (type
) == FUNCTION_TYPE
2183 && TYPE_ARG_TYPES (type
) != 0)
2184 /* The types might not be truly local,
2185 but the list of arg types certainly is temporary.
2186 Since prototypes are nontraditional,
2187 ok not to do the traditional thing. */
2189 type
= TREE_TYPE (type
);
2193 b
= global_binding_level
;
2196 /* This name is new in its binding level.
2197 Install the new declaration and return it. */
2198 if (b
== global_binding_level
)
2200 /* Install a global value. */
2202 /* If the first global decl has external linkage,
2203 warn if we later see static one. */
2204 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2205 TREE_PUBLIC (name
) = 1;
2207 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2209 /* We no longer care about any previous block level declarations. */
2210 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2212 /* Don't forget if the function was used via an implicit decl. */
2213 if (IDENTIFIER_IMPLICIT_DECL (name
)
2214 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2215 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2217 /* Don't forget if its address was taken in that way. */
2218 if (IDENTIFIER_IMPLICIT_DECL (name
)
2219 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2220 TREE_ADDRESSABLE (x
) = 1;
2222 /* Warn about mismatches against previous implicit decl. */
2223 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2224 /* If this real decl matches the implicit, don't complain. */
2225 && ! (TREE_CODE (x
) == FUNCTION_DECL
2226 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2227 == integer_type_node
)))
2228 pedwarn ("`%s' was previously implicitly declared to return `int'",
2229 IDENTIFIER_POINTER (name
));
2231 /* If this decl is `static' and an `extern' was seen previously,
2232 that is erroneous. */
2233 if (TREE_PUBLIC (name
)
2234 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2236 /* Okay to redeclare an ANSI built-in as static. */
2237 if (t
!= 0 && DECL_BUILT_IN (t
))
2239 /* Okay to declare a non-ANSI built-in as anything. */
2240 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2242 /* Okay to have global type decl after an earlier extern
2243 declaration inside a lexical block. */
2244 else if (TREE_CODE (x
) == TYPE_DECL
)
2246 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2247 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2248 IDENTIFIER_POINTER (name
));
2250 pedwarn ("`%s' was declared `extern' and later `static'",
2251 IDENTIFIER_POINTER (name
));
2256 /* Here to install a non-global value. */
2257 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2258 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2259 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2261 /* If this is an extern function declaration, see if we
2262 have a global definition or declaration for the function. */
2264 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2266 && TREE_CODE (x
) == FUNCTION_DECL
2267 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2269 /* We have one. Their types must agree. */
2270 if (! comptypes (TREE_TYPE (x
),
2271 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2272 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2275 /* Inner extern decl is inline if global one is.
2276 Copy enough to really inline it. */
2277 if (DECL_INLINE (oldglobal
))
2279 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2280 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2281 ? 0 : DECL_INITIAL (oldglobal
));
2282 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2283 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2284 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2285 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2286 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2287 DECL_ABSTRACT_ORIGIN (x
) = oldglobal
;
2289 /* Inner extern decl is built-in if global one is. */
2290 if (DECL_BUILT_IN (oldglobal
))
2292 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2293 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2295 /* Keep the arg types from a file-scope fcn defn. */
2296 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2297 && DECL_INITIAL (oldglobal
)
2298 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2299 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2303 #if 0 /* This case is probably sometimes the right thing to do. */
2304 /* If we have a local external declaration,
2305 then any file-scope declaration should not
2306 have been static. */
2307 if (oldlocal
== 0 && oldglobal
!= 0
2308 && !TREE_PUBLIC (oldglobal
)
2309 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2310 warning ("`%s' locally external but globally static",
2311 IDENTIFIER_POINTER (name
));
2314 /* If we have a local external declaration,
2315 and no file-scope declaration has yet been seen,
2316 then if we later have a file-scope decl it must not be static. */
2318 && DECL_EXTERNAL (x
)
2322 TREE_PUBLIC (name
) = 1;
2324 /* Save this decl, so that we can do type checking against
2325 other decls after it falls out of scope.
2327 Only save it once. This prevents temporary decls created in
2328 expand_inline_function from being used here, since this
2329 will have been set when the inline function was parsed.
2330 It also helps give slightly better warnings. */
2331 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2332 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2335 /* Warn if shadowing an argument at the top level of the body. */
2336 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2337 /* This warning doesn't apply to the parms of a nested fcn. */
2338 && ! current_binding_level
->parm_flag
2339 /* Check that this is one level down from the parms. */
2340 && current_binding_level
->level_chain
->parm_flag
2341 /* Check that the decl being shadowed
2342 comes from the parm level, one level up. */
2343 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2345 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2346 pedwarn ("declaration of `%s' shadows a parameter",
2347 IDENTIFIER_POINTER (name
));
2349 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2350 IDENTIFIER_POINTER (name
));
2353 /* Maybe warn if shadowing something else. */
2354 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2355 /* No shadow warnings for internally generated vars. */
2356 && DECL_SOURCE_LINE (x
) != 0
2357 /* No shadow warnings for vars made for inlining. */
2358 && ! DECL_FROM_INLINE (x
))
2360 char *warnstring
= 0;
2362 if (TREE_CODE (x
) == PARM_DECL
2363 && current_binding_level
->level_chain
->parm_flag
)
2364 /* Don't warn about the parm names in function declarator
2365 within a function declarator.
2366 It would be nice to avoid warning in any function
2367 declarator in a declaration, as opposed to a definition,
2368 but there is no way to tell it's not a definition. */
2370 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2371 warnstring
= "declaration of `%s' shadows a parameter";
2372 else if (oldlocal
!= 0)
2373 warnstring
= "declaration of `%s' shadows previous local";
2374 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2375 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2376 warnstring
= "declaration of `%s' shadows global declaration";
2379 warning (warnstring
, IDENTIFIER_POINTER (name
));
2382 /* If storing a local value, there may already be one (inherited).
2383 If so, record it for restoration when this binding level ends. */
2385 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2388 /* Keep count of variables in this level with incomplete type. */
2389 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2393 /* Put decls on list in reverse order.
2394 We will reverse them later if necessary. */
2395 TREE_CHAIN (x
) = b
->names
;
2401 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2404 pushdecl_top_level (x
)
2408 register struct binding_level
*b
= current_binding_level
;
2410 current_binding_level
= global_binding_level
;
2412 current_binding_level
= b
;
2416 /* Generate an implicit declaration for identifier FUNCTIONID
2417 as a function of type int (). Print a warning if appropriate. */
2420 implicitly_declare (functionid
)
2424 int traditional_warning
= 0;
2425 /* Only one "implicit declaration" warning per identifier. */
2426 int implicit_warning
;
2428 /* Save the decl permanently so we can warn if definition follows. */
2429 push_obstacks_nochange ();
2430 end_temporary_allocation ();
2432 /* We used to reuse an old implicit decl here,
2433 but this loses with inline functions because it can clobber
2434 the saved decl chains. */
2435 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2436 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2438 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2440 /* Warn of implicit decl following explicit local extern decl.
2441 This is probably a program designed for traditional C. */
2442 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2443 traditional_warning
= 1;
2445 /* Warn once of an implicit declaration. */
2446 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2448 DECL_EXTERNAL (decl
) = 1;
2449 TREE_PUBLIC (decl
) = 1;
2450 DECL_ARTIFICIAL (decl
);
2452 /* Record that we have an implicit decl and this is it. */
2453 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2455 /* ANSI standard says implicit declarations are in the innermost block.
2456 So we record the decl in the standard fashion.
2457 If flag_traditional is set, pushdecl does it top-level. */
2460 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2461 maybe_objc_check_decl (decl
);
2463 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2465 if (warn_implicit
&& implicit_warning
)
2466 warning ("implicit declaration of function `%s'",
2467 IDENTIFIER_POINTER (functionid
));
2468 else if (warn_traditional
&& traditional_warning
)
2469 warning ("function `%s' was previously declared within a block",
2470 IDENTIFIER_POINTER (functionid
));
2472 /* Write a record describing this implicit function declaration to the
2473 prototypes file (if requested). */
2475 gen_aux_info_record (decl
, 0, 1, 0);
2482 /* Return zero if the declaration NEWDECL is valid
2483 when the declaration OLDDECL (assumed to be for the same name)
2484 has already been seen.
2485 Otherwise return an error message format string with a %s
2486 where the identifier should go. */
2489 redeclaration_error_message (newdecl
, olddecl
)
2490 tree newdecl
, olddecl
;
2492 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2494 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2496 /* pushdecl creates distinct types for TYPE_DECLs by calling
2497 build_type_copy, so the above comparison generally fails. We do
2498 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2499 is equivalent to what this code used to do before the build_type_copy
2500 call. The variant type distinction should not matter for traditional
2501 code, because it doesn't have type qualifiers. */
2502 if (flag_traditional
2503 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2505 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2507 return "redefinition of `%s'";
2509 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2511 /* Declarations of functions can insist on internal linkage
2512 but they can't be inconsistent with internal linkage,
2513 so there can be no error on that account.
2514 However defining the same name twice is no good. */
2515 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2516 /* However, defining once as extern inline and a second
2517 time in another way is ok. */
2518 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2519 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2520 return "redefinition of `%s'";
2523 else if (current_binding_level
== global_binding_level
)
2525 /* Objects declared at top level: */
2526 /* If at least one is a reference, it's ok. */
2527 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2529 /* Reject two definitions. */
2530 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2531 return "redefinition of `%s'";
2532 /* Now we have two tentative defs, or one tentative and one real def. */
2533 /* Insist that the linkage match. */
2534 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2535 return "conflicting declarations of `%s'";
2538 else if (current_binding_level
->parm_flag
2539 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2543 /* Newdecl has block scope. If olddecl has block scope also, then
2544 reject two definitions, and reject a definition together with an
2545 external reference. Otherwise, it is OK, because newdecl must
2546 be an extern reference to olddecl. */
2547 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2548 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2549 return "redeclaration of `%s'";
2554 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2555 Create one if none exists so far for the current function.
2556 This function is called for both label definitions and label references. */
2562 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2564 if (current_function_decl
== 0)
2566 error ("label %s referenced outside of any function",
2567 IDENTIFIER_POINTER (id
));
2571 /* Use a label already defined or ref'd with this name. */
2574 /* But not if it is inherited and wasn't declared to be inheritable. */
2575 if (DECL_CONTEXT (decl
) != current_function_decl
2576 && ! C_DECLARED_LABEL_FLAG (decl
))
2577 return shadow_label (id
);
2581 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2583 /* Make sure every label has an rtx. */
2586 /* A label not explicitly declared must be local to where it's ref'd. */
2587 DECL_CONTEXT (decl
) = current_function_decl
;
2589 DECL_MODE (decl
) = VOIDmode
;
2591 /* Say where one reference is to the label,
2592 for the sake of the error if it is not defined. */
2593 DECL_SOURCE_LINE (decl
) = lineno
;
2594 DECL_SOURCE_FILE (decl
) = input_filename
;
2596 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2598 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2603 /* Make a label named NAME in the current function,
2604 shadowing silently any that may be inherited from containing functions
2605 or containing scopes.
2607 Note that valid use, if the label being shadowed
2608 comes from another scope in the same function,
2609 requires calling declare_nonlocal_label right away. */
2615 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2621 /* Check to make sure that the label hasn't already been declared
2622 at this label scope */
2623 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2624 if (TREE_VALUE (dup
) == decl
)
2626 error ("duplicate label declaration `%s'",
2627 IDENTIFIER_POINTER (name
));
2628 error_with_decl (TREE_VALUE (dup
),
2629 "this is a previous declaration");
2630 /* Just use the previous declaration. */
2631 return lookup_label (name
);
2634 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2635 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2638 return lookup_label (name
);
2641 /* Define a label, specifying the location in the source file.
2642 Return the LABEL_DECL node for the label, if the definition is valid.
2643 Otherwise return 0. */
2646 define_label (filename
, line
, name
)
2651 tree decl
= lookup_label (name
);
2653 /* If label with this name is known from an outer context, shadow it. */
2654 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2656 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2657 IDENTIFIER_LABEL_VALUE (name
) = 0;
2658 decl
= lookup_label (name
);
2661 if (DECL_INITIAL (decl
) != 0)
2663 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2668 /* Mark label as having been defined. */
2669 DECL_INITIAL (decl
) = error_mark_node
;
2670 /* Say where in the source. */
2671 DECL_SOURCE_FILE (decl
) = filename
;
2672 DECL_SOURCE_LINE (decl
) = line
;
2677 /* Return the list of declarations of the current level.
2678 Note that this list is in reverse order unless/until
2679 you nreverse it; and when you do nreverse it, you must
2680 store the result back using `storedecls' or you will lose. */
2685 return current_binding_level
->names
;
2688 /* Return the list of type-tags (for structs, etc) of the current level. */
2693 return current_binding_level
->tags
;
2696 /* Store the list of declarations of the current level.
2697 This is done for the parameter declarations of a function being defined,
2698 after they are modified in the light of any missing parameters. */
2704 current_binding_level
->names
= decls
;
2707 /* Similarly, store the list of tags of the current level. */
2713 current_binding_level
->tags
= tags
;
2716 /* Given NAME, an IDENTIFIER_NODE,
2717 return the structure (or union or enum) definition for that name.
2718 Searches binding levels from BINDING_LEVEL up to the global level.
2719 If THISLEVEL_ONLY is nonzero, searches only the specified context
2720 (but skips any tag-transparent contexts to find one that is
2721 meaningful for tags).
2722 CODE says which kind of type the caller wants;
2723 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2724 If the wrong kind of type is found, an error is reported. */
2727 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2728 enum tree_code code
;
2729 struct binding_level
*binding_level
;
2733 register struct binding_level
*level
;
2735 for (level
= binding_level
; level
; level
= level
->level_chain
)
2738 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2740 if (TREE_PURPOSE (tail
) == name
)
2742 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2744 /* Definition isn't the kind we were looking for. */
2745 pending_invalid_xref
= name
;
2746 pending_invalid_xref_file
= input_filename
;
2747 pending_invalid_xref_line
= lineno
;
2749 return TREE_VALUE (tail
);
2752 if (thislevel_only
&& ! level
->tag_transparent
)
2758 /* Print an error message now
2759 for a recent invalid struct, union or enum cross reference.
2760 We don't print them immediately because they are not invalid
2761 when used in the `struct foo;' construct for shadowing. */
2764 pending_xref_error ()
2766 if (pending_invalid_xref
!= 0)
2767 error_with_file_and_line (pending_invalid_xref_file
,
2768 pending_invalid_xref_line
,
2769 "`%s' defined as wrong kind of tag",
2770 IDENTIFIER_POINTER (pending_invalid_xref
));
2771 pending_invalid_xref
= 0;
2774 /* Given a type, find the tag that was defined for it and return the tag name.
2775 Otherwise return 0. */
2778 lookup_tag_reverse (type
)
2781 register struct binding_level
*level
;
2783 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2786 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2788 if (TREE_VALUE (tail
) == type
)
2789 return TREE_PURPOSE (tail
);
2795 /* Look up NAME in the current binding level and its superiors
2796 in the namespace of variables, functions and typedefs.
2797 Return a ..._DECL node of some kind representing its definition,
2798 or return 0 if it is undefined. */
2805 if (current_binding_level
!= global_binding_level
2806 && IDENTIFIER_LOCAL_VALUE (name
))
2807 val
= IDENTIFIER_LOCAL_VALUE (name
);
2809 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2813 /* Similar to `lookup_name' but look only at current binding level. */
2816 lookup_name_current_level (name
)
2821 if (current_binding_level
== global_binding_level
)
2822 return IDENTIFIER_GLOBAL_VALUE (name
);
2824 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2827 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2828 if (DECL_NAME (t
) == name
)
2834 /* Create the predefined scalar types of C,
2835 and some nodes representing standard constants (0, 1, (void *) 0).
2836 Initialize the global binding level.
2837 Make definitions for built-in primitive functions. */
2840 init_decl_processing ()
2842 register tree endlink
;
2843 /* Either char* or void*. */
2844 tree traditional_ptr_type_node
;
2845 /* Data types of memcpy and strlen. */
2846 tree memcpy_ftype
, memset_ftype
, strlen_ftype
;
2847 tree void_ftype_any
;
2848 int wchar_type_size
;
2850 tree array_domain_type
;
2852 current_function_decl
= NULL
;
2853 named_labels
= NULL
;
2854 current_binding_level
= NULL_BINDING_LEVEL
;
2855 free_binding_level
= NULL_BINDING_LEVEL
;
2856 pushlevel (0); /* make the binding_level structure for global names */
2857 global_binding_level
= current_binding_level
;
2859 /* Define `int' and `char' first so that dbx will output them first. */
2861 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2862 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2863 integer_type_node
));
2865 /* Define `char', which is like either `signed char' or `unsigned char'
2866 but not the same as either. */
2870 ? make_signed_type (CHAR_TYPE_SIZE
)
2871 : make_unsigned_type (CHAR_TYPE_SIZE
));
2872 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2875 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2876 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2877 long_integer_type_node
));
2879 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2880 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2881 unsigned_type_node
));
2883 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
2884 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2885 long_unsigned_type_node
));
2887 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
2888 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2889 long_long_integer_type_node
));
2891 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
2892 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2893 long_long_unsigned_type_node
));
2895 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
2896 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2897 short_integer_type_node
));
2899 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
2900 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2901 short_unsigned_type_node
));
2903 /* `unsigned long' is the standard type for sizeof.
2904 Traditionally, use a signed type.
2905 Note that stddef.h uses `unsigned long',
2906 and this must agree, even of long and int are the same size. */
2908 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2909 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
2910 sizetype
= signed_type (sizetype
);
2913 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
2915 TREE_TYPE (TYPE_SIZE (integer_type_node
)) = sizetype
;
2916 TREE_TYPE (TYPE_SIZE (char_type_node
)) = sizetype
;
2917 TREE_TYPE (TYPE_SIZE (unsigned_type_node
)) = sizetype
;
2918 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node
)) = sizetype
;
2919 TREE_TYPE (TYPE_SIZE (long_integer_type_node
)) = sizetype
;
2920 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node
)) = sizetype
;
2921 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node
)) = sizetype
;
2922 TREE_TYPE (TYPE_SIZE (short_integer_type_node
)) = sizetype
;
2923 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node
)) = sizetype
;
2925 error_mark_node
= make_node (ERROR_MARK
);
2926 TREE_TYPE (error_mark_node
) = error_mark_node
;
2928 /* Define both `signed char' and `unsigned char'. */
2929 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
2930 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2931 signed_char_type_node
));
2933 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
2934 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2935 unsigned_char_type_node
));
2937 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
2938 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2940 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
2941 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2943 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
2944 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2946 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
2947 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2949 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
2950 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2952 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
2953 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2955 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
2956 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2958 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
2959 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2961 float_type_node
= make_node (REAL_TYPE
);
2962 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
2963 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2965 layout_type (float_type_node
);
2967 double_type_node
= make_node (REAL_TYPE
);
2968 if (flag_short_double
)
2969 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
2971 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
2972 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2974 layout_type (double_type_node
);
2976 long_double_type_node
= make_node (REAL_TYPE
);
2977 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
2978 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2979 long_double_type_node
));
2980 layout_type (long_double_type_node
);
2982 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
2983 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2984 complex_integer_type_node
));
2985 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
2986 layout_type (complex_integer_type_node
);
2988 complex_float_type_node
= make_node (COMPLEX_TYPE
);
2989 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2990 complex_float_type_node
));
2991 TREE_TYPE (complex_float_type_node
) = float_type_node
;
2992 layout_type (complex_float_type_node
);
2994 complex_double_type_node
= make_node (COMPLEX_TYPE
);
2995 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2996 complex_double_type_node
));
2997 TREE_TYPE (complex_double_type_node
) = double_type_node
;
2998 layout_type (complex_double_type_node
);
3000 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
3001 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
3002 complex_long_double_type_node
));
3003 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
3004 layout_type (complex_long_double_type_node
);
3007 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
3008 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3009 signed_wchar_type_node
= signed_type (wchar_type_node
);
3010 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
3012 integer_zero_node
= build_int_2 (0, 0);
3013 TREE_TYPE (integer_zero_node
) = integer_type_node
;
3014 integer_one_node
= build_int_2 (1, 0);
3015 TREE_TYPE (integer_one_node
) = integer_type_node
;
3017 boolean_type_node
= integer_type_node
;
3018 boolean_true_node
= integer_one_node
;
3019 boolean_false_node
= integer_zero_node
;
3021 size_zero_node
= build_int_2 (0, 0);
3022 TREE_TYPE (size_zero_node
) = sizetype
;
3023 size_one_node
= build_int_2 (1, 0);
3024 TREE_TYPE (size_one_node
) = sizetype
;
3026 void_type_node
= make_node (VOID_TYPE
);
3027 pushdecl (build_decl (TYPE_DECL
,
3028 ridpointers
[(int) RID_VOID
], void_type_node
));
3029 layout_type (void_type_node
); /* Uses integer_zero_node */
3030 /* We are not going to have real types in C with less than byte alignment,
3031 so we might as well not have any types that claim to have it. */
3032 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
3034 null_pointer_node
= build_int_2 (0, 0);
3035 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
3036 layout_type (TREE_TYPE (null_pointer_node
));
3038 string_type_node
= build_pointer_type (char_type_node
);
3039 const_string_type_node
3040 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3042 /* Make a type to be the domain of a few array types
3043 whose domains don't really matter.
3044 200 is small enough that it always fits in size_t
3045 and large enough that it can hold most function names for the
3046 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3047 array_domain_type
= build_index_type (build_int_2 (200, 0));
3049 /* make a type for arrays of characters.
3050 With luck nothing will ever really depend on the length of this
3052 char_array_type_node
3053 = build_array_type (char_type_node
, array_domain_type
);
3054 /* Likewise for arrays of ints. */
3056 = build_array_type (integer_type_node
, array_domain_type
);
3057 /* This is for wide string constants. */
3058 wchar_array_type_node
3059 = build_array_type (wchar_type_node
, array_domain_type
);
3061 default_function_type
3062 = build_function_type (integer_type_node
, NULL_TREE
);
3064 ptr_type_node
= build_pointer_type (void_type_node
);
3066 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
3068 endlink
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3071 = build_function_type (void_type_node
, NULL_TREE
);
3074 = build_function_type (float_type_node
,
3075 tree_cons (NULL_TREE
, float_type_node
, endlink
));
3078 = build_function_type (double_type_node
,
3079 tree_cons (NULL_TREE
, double_type_node
, endlink
));
3081 ldouble_ftype_ldouble
3082 = build_function_type (long_double_type_node
,
3083 tree_cons (NULL_TREE
, long_double_type_node
,
3086 double_ftype_double_double
3087 = build_function_type (double_type_node
,
3088 tree_cons (NULL_TREE
, double_type_node
,
3089 tree_cons (NULL_TREE
,
3090 double_type_node
, endlink
)));
3093 = build_function_type (integer_type_node
,
3094 tree_cons (NULL_TREE
, integer_type_node
, endlink
));
3097 = build_function_type (long_integer_type_node
,
3098 tree_cons (NULL_TREE
,
3099 long_integer_type_node
, endlink
));
3101 void_ftype_ptr_ptr_int
3102 = build_function_type (void_type_node
,
3103 tree_cons (NULL_TREE
, ptr_type_node
,
3104 tree_cons (NULL_TREE
, ptr_type_node
,
3105 tree_cons (NULL_TREE
,
3109 int_ftype_cptr_cptr_sizet
3110 = build_function_type (integer_type_node
,
3111 tree_cons (NULL_TREE
, const_ptr_type_node
,
3112 tree_cons (NULL_TREE
, const_ptr_type_node
,
3113 tree_cons (NULL_TREE
,
3117 void_ftype_ptr_int_int
3118 = build_function_type (void_type_node
,
3119 tree_cons (NULL_TREE
, ptr_type_node
,
3120 tree_cons (NULL_TREE
, integer_type_node
,
3121 tree_cons (NULL_TREE
,
3125 string_ftype_ptr_ptr
/* strcpy prototype */
3126 = build_function_type (string_type_node
,
3127 tree_cons (NULL_TREE
, string_type_node
,
3128 tree_cons (NULL_TREE
,
3129 const_string_type_node
,
3132 int_ftype_string_string
/* strcmp prototype */
3133 = build_function_type (integer_type_node
,
3134 tree_cons (NULL_TREE
, const_string_type_node
,
3135 tree_cons (NULL_TREE
,
3136 const_string_type_node
,
3139 strlen_ftype
/* strlen prototype */
3140 = build_function_type (flag_traditional
? integer_type_node
: sizetype
,
3141 tree_cons (NULL_TREE
, const_string_type_node
,
3144 traditional_ptr_type_node
3145 = (flag_traditional
? string_type_node
: ptr_type_node
);
3147 memcpy_ftype
/* memcpy prototype */
3148 = build_function_type (traditional_ptr_type_node
,
3149 tree_cons (NULL_TREE
, ptr_type_node
,
3150 tree_cons (NULL_TREE
, const_ptr_type_node
,
3151 tree_cons (NULL_TREE
,
3155 memset_ftype
/* memset prototype */
3156 = build_function_type (traditional_ptr_type_node
,
3157 tree_cons (NULL_TREE
, ptr_type_node
,
3158 tree_cons (NULL_TREE
, integer_type_node
,
3159 tree_cons (NULL_TREE
,
3163 builtin_function ("__builtin_constant_p", default_function_type
,
3164 BUILT_IN_CONSTANT_P
, NULL_PTR
);
3166 builtin_function ("__builtin_return_address",
3167 build_function_type (ptr_type_node
,
3168 tree_cons (NULL_TREE
,
3171 BUILT_IN_RETURN_ADDRESS
, NULL_PTR
);
3173 builtin_function ("__builtin_frame_address",
3174 build_function_type (ptr_type_node
,
3175 tree_cons (NULL_TREE
,
3178 BUILT_IN_FRAME_ADDRESS
, NULL_PTR
);
3180 builtin_function ("__builtin_alloca",
3181 build_function_type (ptr_type_node
,
3182 tree_cons (NULL_TREE
,
3185 BUILT_IN_ALLOCA
, "alloca");
3186 builtin_function ("__builtin_ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3187 /* Define alloca, ffs as builtins.
3188 Declare _exit just to mark it as volatile. */
3189 if (! flag_no_builtin
&& !flag_no_nonansi_builtin
)
3191 temp
= builtin_function ("alloca",
3192 build_function_type (ptr_type_node
,
3193 tree_cons (NULL_TREE
,
3196 BUILT_IN_ALLOCA
, NULL_PTR
);
3197 /* Suppress error if redefined as a non-function. */
3198 DECL_BUILT_IN_NONANSI (temp
) = 1;
3199 temp
= builtin_function ("ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3200 /* Suppress error if redefined as a non-function. */
3201 DECL_BUILT_IN_NONANSI (temp
) = 1;
3202 temp
= builtin_function ("_exit", void_ftype_any
, NOT_BUILT_IN
,
3204 TREE_THIS_VOLATILE (temp
) = 1;
3205 TREE_SIDE_EFFECTS (temp
) = 1;
3206 /* Suppress error if redefined as a non-function. */
3207 DECL_BUILT_IN_NONANSI (temp
) = 1;
3210 builtin_function ("__builtin_abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3211 builtin_function ("__builtin_fabsf", float_ftype_float
, BUILT_IN_FABS
,
3213 builtin_function ("__builtin_fabs", double_ftype_double
, BUILT_IN_FABS
,
3215 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3217 builtin_function ("__builtin_labs", long_ftype_long
, BUILT_IN_LABS
,
3219 builtin_function ("__builtin_saveregs",
3220 build_function_type (ptr_type_node
, NULL_TREE
),
3221 BUILT_IN_SAVEREGS
, NULL_PTR
);
3222 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3224 builtin_function ("__builtin_varargs",
3225 build_function_type (ptr_type_node
,
3226 tree_cons (NULL_TREE
,
3229 BUILT_IN_VARARGS
, NULL_PTR
);
3231 builtin_function ("__builtin_classify_type", default_function_type
,
3232 BUILT_IN_CLASSIFY_TYPE
, NULL_PTR
);
3233 builtin_function ("__builtin_next_arg",
3234 build_function_type (ptr_type_node
, NULL_TREE
),
3235 BUILT_IN_NEXT_ARG
, NULL_PTR
);
3236 builtin_function ("__builtin_args_info",
3237 build_function_type (integer_type_node
,
3238 tree_cons (NULL_TREE
,
3241 BUILT_IN_ARGS_INFO
, NULL_PTR
);
3243 /* Untyped call and return. */
3244 builtin_function ("__builtin_apply_args",
3245 build_function_type (ptr_type_node
, NULL_TREE
),
3246 BUILT_IN_APPLY_ARGS
, NULL_PTR
);
3248 temp
= tree_cons (NULL_TREE
,
3249 build_pointer_type (build_function_type (void_type_node
,
3251 tree_cons (NULL_TREE
,
3253 tree_cons (NULL_TREE
,
3256 builtin_function ("__builtin_apply",
3257 build_function_type (ptr_type_node
, temp
),
3258 BUILT_IN_APPLY
, NULL_PTR
);
3259 builtin_function ("__builtin_return",
3260 build_function_type (void_type_node
,
3261 tree_cons (NULL_TREE
,
3264 BUILT_IN_RETURN
, NULL_PTR
);
3266 /* Currently under experimentation. */
3267 builtin_function ("__builtin_memcpy", memcpy_ftype
,
3268 BUILT_IN_MEMCPY
, "memcpy");
3269 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet
,
3270 BUILT_IN_MEMCMP
, "memcmp");
3271 builtin_function ("__builtin_memset", memset_ftype
,
3272 BUILT_IN_MEMSET
, NULL_PTR
);
3273 builtin_function ("__builtin_strcmp", int_ftype_string_string
,
3274 BUILT_IN_STRCMP
, "strcmp");
3275 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr
,
3276 BUILT_IN_STRCPY
, "strcpy");
3277 builtin_function ("__builtin_strlen", strlen_ftype
,
3278 BUILT_IN_STRLEN
, "strlen");
3279 builtin_function ("__builtin_sqrtf", float_ftype_float
,
3280 BUILT_IN_FSQRT
, "sqrtf");
3281 builtin_function ("__builtin_fsqrt", double_ftype_double
,
3282 BUILT_IN_FSQRT
, "sqrt");
3283 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble
,
3284 BUILT_IN_FSQRT
, "sqrtl");
3285 builtin_function ("__builtin_sinf", float_ftype_float
,
3286 BUILT_IN_SIN
, "sinf");
3287 builtin_function ("__builtin_sin", double_ftype_double
,
3288 BUILT_IN_SIN
, "sin");
3289 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble
,
3290 BUILT_IN_SIN
, "sinl");
3291 builtin_function ("__builtin_cosf", float_ftype_float
,
3292 BUILT_IN_COS
, "cosf");
3293 builtin_function ("__builtin_cos", double_ftype_double
,
3294 BUILT_IN_COS
, "cos");
3295 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble
,
3296 BUILT_IN_COS
, "cosl");
3297 builtin_function ("__builtin_setjmp",
3298 build_function_type (integer_type_node
,
3299 tree_cons (NULL_TREE
,
3300 ptr_type_node
, endlink
)),
3301 BUILT_IN_SETJMP
, NULL_PTR
);
3302 builtin_function ("__builtin_longjmp",
3305 tree_cons (NULL
, ptr_type_node
,
3306 tree_cons (NULL_TREE
,
3309 BUILT_IN_LONGJMP
, NULL_PTR
);
3311 /* In an ANSI C program, it is okay to supply built-in meanings
3312 for these functions, since applications cannot validly use them
3313 with any other meaning.
3314 However, honor the -fno-builtin option. */
3315 if (!flag_no_builtin
)
3317 builtin_function ("abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3318 builtin_function ("fabsf", float_ftype_float
, BUILT_IN_FABS
, NULL_PTR
);
3319 builtin_function ("fabs", double_ftype_double
, BUILT_IN_FABS
, NULL_PTR
);
3320 builtin_function ("fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3322 builtin_function ("labs", long_ftype_long
, BUILT_IN_LABS
, NULL_PTR
);
3323 builtin_function ("memcpy", memcpy_ftype
, BUILT_IN_MEMCPY
, NULL_PTR
);
3324 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet
, BUILT_IN_MEMCMP
,
3326 builtin_function ("memset", memset_ftype
, BUILT_IN_MEMSET
, NULL_PTR
);
3327 builtin_function ("strcmp", int_ftype_string_string
, BUILT_IN_STRCMP
,
3329 builtin_function ("strcpy", string_ftype_ptr_ptr
, BUILT_IN_STRCPY
,
3331 builtin_function ("strlen", strlen_ftype
, BUILT_IN_STRLEN
, NULL_PTR
);
3332 builtin_function ("sqrtf", float_ftype_float
, BUILT_IN_FSQRT
, NULL_PTR
);
3333 builtin_function ("sqrt", double_ftype_double
, BUILT_IN_FSQRT
, NULL_PTR
);
3334 builtin_function ("sqrtl", ldouble_ftype_ldouble
, BUILT_IN_FSQRT
,
3336 builtin_function ("sinf", float_ftype_float
, BUILT_IN_SIN
, NULL_PTR
);
3337 builtin_function ("sin", double_ftype_double
, BUILT_IN_SIN
, NULL_PTR
);
3338 builtin_function ("sinl", ldouble_ftype_ldouble
, BUILT_IN_SIN
, NULL_PTR
);
3339 builtin_function ("cosf", float_ftype_float
, BUILT_IN_COS
, NULL_PTR
);
3340 builtin_function ("cos", double_ftype_double
, BUILT_IN_COS
, NULL_PTR
);
3341 builtin_function ("cosl", ldouble_ftype_ldouble
, BUILT_IN_COS
, NULL_PTR
);
3343 /* Declare these functions volatile
3344 to avoid spurious "control drops through" warnings. */
3345 /* Don't specify the argument types, to avoid errors
3346 from certain code which isn't valid in ANSI but which exists. */
3347 temp
= builtin_function ("abort", void_ftype_any
, NOT_BUILT_IN
,
3349 TREE_THIS_VOLATILE (temp
) = 1;
3350 TREE_SIDE_EFFECTS (temp
) = 1;
3351 temp
= builtin_function ("exit", void_ftype_any
, NOT_BUILT_IN
, NULL_PTR
);
3352 TREE_THIS_VOLATILE (temp
) = 1;
3353 TREE_SIDE_EFFECTS (temp
) = 1;
3357 /* Support for these has not been written in either expand_builtin
3358 or build_function_call. */
3359 builtin_function ("__builtin_div", default_ftype
, BUILT_IN_DIV
, NULL_PTR
);
3360 builtin_function ("__builtin_ldiv", default_ftype
, BUILT_IN_LDIV
, NULL_PTR
);
3361 builtin_function ("__builtin_ffloor", double_ftype_double
, BUILT_IN_FFLOOR
,
3363 builtin_function ("__builtin_fceil", double_ftype_double
, BUILT_IN_FCEIL
,
3365 builtin_function ("__builtin_fmod", double_ftype_double_double
,
3366 BUILT_IN_FMOD
, NULL_PTR
);
3367 builtin_function ("__builtin_frem", double_ftype_double_double
,
3368 BUILT_IN_FREM
, NULL_PTR
);
3369 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int
,
3370 BUILT_IN_MEMSET
, NULL_PTR
);
3371 builtin_function ("__builtin_getexp", double_ftype_double
, BUILT_IN_GETEXP
,
3373 builtin_function ("__builtin_getman", double_ftype_double
, BUILT_IN_GETMAN
,
3377 pedantic_lvalues
= pedantic
;
3379 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3380 declare_function_name ();
3382 start_identifier_warnings ();
3384 /* Prepare to check format strings against argument lists. */
3385 init_function_format_info ();
3389 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3392 /* Return a definition for a builtin function named NAME and whose data type
3393 is TYPE. TYPE should be a function type with argument types.
3394 FUNCTION_CODE tells later passes how to compile calls to this function.
3395 See tree.h for its possible values.
3397 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3398 the name to be called if we can't opencode the function. */
3401 builtin_function (name
, type
, function_code
, library_name
)
3404 enum built_in_function function_code
;
3407 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3408 DECL_EXTERNAL (decl
) = 1;
3409 TREE_PUBLIC (decl
) = 1;
3410 /* If -traditional, permit redefining a builtin function any way you like.
3411 (Though really, if the program redefines these functions,
3412 it probably won't work right unless compiled with -fno-builtin.) */
3413 if (flag_traditional
&& name
[0] != '_')
3414 DECL_BUILT_IN_NONANSI (decl
) = 1;
3416 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3417 make_decl_rtl (decl
, NULL_PTR
, 1);
3419 if (function_code
!= NOT_BUILT_IN
)
3421 DECL_BUILT_IN (decl
) = 1;
3422 DECL_FUNCTION_CODE (decl
) = function_code
;
3424 /* Warn if a function in the namespace for users
3425 is used without an occasion to consider it declared. */
3426 if (name
[0] != '_' || name
[1] != '_')
3427 C_DECL_ANTICIPATED (decl
) = 1;
3432 /* Called when a declaration is seen that contains no names to declare.
3433 If its type is a reference to a structure, union or enum inherited
3434 from a containing scope, shadow that tag name for the current scope
3435 with a forward reference.
3436 If its type defines a new named structure or union
3437 or defines an enum, it is valid but we need not do anything here.
3438 Otherwise, it is an error. */
3441 shadow_tag (declspecs
)
3444 shadow_tag_warned (declspecs
, 0);
3448 shadow_tag_warned (declspecs
, warned
)
3451 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3457 pending_invalid_xref
= 0;
3459 for (link
= declspecs
; link
; link
= TREE_CHAIN (link
))
3461 register tree value
= TREE_VALUE (link
);
3462 register enum tree_code code
= TREE_CODE (value
);
3464 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3465 /* Used to test also that TYPE_SIZE (value) != 0.
3466 That caused warning for `struct foo;' at top level in the file. */
3468 register tree name
= lookup_tag_reverse (value
);
3475 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3476 /* Empty unnamed enum OK */
3478 pedwarn ("unnamed struct/union that defines no instances");
3484 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3488 t
= make_node (code
);
3495 if (!warned
&& ! in_system_header
)
3497 warning ("useless keyword or type name in empty declaration");
3504 error ("two types specified in one empty declaration");
3509 pedwarn ("empty declaration");
3513 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3516 groktypename (typename
)
3519 if (TREE_CODE (typename
) != TREE_LIST
)
3521 return grokdeclarator (TREE_VALUE (typename
),
3522 TREE_PURPOSE (typename
),
3526 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3529 groktypename_in_parm_context (typename
)
3532 if (TREE_CODE (typename
) != TREE_LIST
)
3534 return grokdeclarator (TREE_VALUE (typename
),
3535 TREE_PURPOSE (typename
),
3539 /* Decode a declarator in an ordinary declaration or data definition.
3540 This is called as soon as the type information and variable name
3541 have been parsed, before parsing the initializer if any.
3542 Here we create the ..._DECL node, fill in its type,
3543 and put it on the list of decls for the current context.
3544 The ..._DECL node is returned as the value.
3546 Exception: for arrays where the length is not specified,
3547 the type is left null, to be filled in by `finish_decl'.
3549 Function definitions do not come here; they go to start_function
3550 instead. However, external and forward declarations of functions
3551 do go through here. Structure field declarations are done by
3552 grokfield and not through here. */
3554 /* Set this to zero to debug not using the temporary obstack
3555 to parse initializers. */
3556 int debug_temp_inits
= 1;
3559 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3560 tree declarator
, declspecs
;
3562 tree attributes
, prefix_attributes
;
3564 register tree decl
= grokdeclarator (declarator
, declspecs
,
3565 NORMAL
, initialized
);
3567 int init_written
= initialized
;
3569 /* The corresponding pop_obstacks is in finish_decl. */
3570 push_obstacks_nochange ();
3572 if (warn_main
&& !strcmp (IDENTIFIER_POINTER (declarator
), "main"))
3573 warning_with_decl (decl
, "`%s' is usually a function");
3576 /* Is it valid for this decl to have an initializer at all?
3577 If not, set INITIALIZED to zero, which will indirectly
3578 tell `finish_decl' to ignore the initializer once it is parsed. */
3579 switch (TREE_CODE (decl
))
3582 /* typedef foo = bar means give foo the same type as bar.
3583 We haven't parsed bar yet, so `finish_decl' will fix that up.
3584 Any other case of an initialization in a TYPE_DECL is an error. */
3585 if (pedantic
|| list_length (declspecs
) > 1)
3587 error ("typedef `%s' is initialized",
3588 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3594 error ("function `%s' is initialized like a variable",
3595 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3600 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3601 error ("parameter `%s' is initialized",
3602 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3607 /* Don't allow initializations for incomplete types
3608 except for arrays which might be completed by the initialization. */
3609 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3611 /* A complete type is ok if size is fixed. */
3613 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3614 || C_DECL_VARIABLE_SIZE (decl
))
3616 error ("variable-sized object may not be initialized");
3620 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3622 error ("variable `%s' has initializer but incomplete type",
3623 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3626 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3628 error ("elements of array `%s' have incomplete type",
3629 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3636 #if 0 /* Seems redundant with grokdeclarator. */
3637 if (current_binding_level
!= global_binding_level
3638 && DECL_EXTERNAL (decl
)
3639 && TREE_CODE (decl
) != FUNCTION_DECL
)
3640 warning ("declaration of `%s' has `extern' and is initialized",
3641 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3643 DECL_EXTERNAL (decl
) = 0;
3644 if (current_binding_level
== global_binding_level
)
3645 TREE_STATIC (decl
) = 1;
3647 /* Tell `pushdecl' this is an initialized decl
3648 even though we don't yet have the initializer expression.
3649 Also tell `finish_decl' it may store the real initializer. */
3650 DECL_INITIAL (decl
) = error_mark_node
;
3653 /* If this is a function declaration, write a record describing it to the
3654 prototypes file (if requested). */
3656 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3657 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3659 /* ANSI specifies that a tentative definition which is not merged with
3660 a non-tentative definition behaves exactly like a definition with an
3661 initializer equal to zero. (Section 3.7.2)
3662 -fno-common gives strict ANSI behavior. Usually you don't want it.
3663 This matters only for variables with external linkage. */
3664 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3665 DECL_COMMON (decl
) = 1;
3667 /* Set attributes here so if duplicate decl, will have proper attributes. */
3668 decl_attributes (decl
, attributes
, prefix_attributes
);
3670 /* Add this decl to the current binding level.
3671 TEM may equal DECL or it may be a previous decl of the same name. */
3672 tem
= pushdecl (decl
);
3674 /* For a local variable, define the RTL now. */
3675 if (current_binding_level
!= global_binding_level
3676 /* But not if this is a duplicate decl
3677 and we preserved the rtl from the previous one
3678 (which may or may not happen). */
3679 && DECL_RTL (tem
) == 0)
3681 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3683 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3684 && DECL_INITIAL (tem
) != 0)
3690 /* When parsing and digesting the initializer,
3691 use temporary storage. Do this even if we will ignore the value. */
3692 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3693 temporary_allocation ();
3699 /* Finish processing of a declaration;
3700 install its initial value.
3701 If the length of an array type is not known before,
3702 it must be determined now, from the initial value, or it is an error. */
3705 finish_decl (decl
, init
, asmspec_tree
)
3709 register tree type
= TREE_TYPE (decl
);
3710 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3711 int temporary
= allocation_temporary_p ();
3714 /* If a name was specified, get the string. */
3716 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3718 /* If `start_decl' didn't like having an initialization, ignore it now. */
3720 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3722 /* Don't crash if parm is initialized. */
3723 if (TREE_CODE (decl
) == PARM_DECL
)
3726 if (ITERATOR_P (decl
))
3729 error_with_decl (decl
, "iterator has no initial value");
3731 init
= save_expr (init
);
3736 if (TREE_CODE (decl
) != TYPE_DECL
)
3737 store_init_value (decl
, init
);
3740 /* typedef foo = bar; store the type of bar as the type of foo. */
3741 TREE_TYPE (decl
) = TREE_TYPE (init
);
3742 DECL_INITIAL (decl
) = init
= 0;
3746 /* Pop back to the obstack that is current for this binding level.
3747 This is because MAXINDEX, rtl, etc. to be made below
3748 must go in the permanent obstack. But don't discard the
3749 temporary data yet. */
3751 #if 0 /* pop_obstacks was near the end; this is what was here. */
3752 if (current_binding_level
== global_binding_level
&& temporary
)
3753 end_temporary_allocation ();
3756 /* Deduce size of array from initialization, if not already known */
3758 if (TREE_CODE (type
) == ARRAY_TYPE
3759 && TYPE_DOMAIN (type
) == 0
3760 && TREE_CODE (decl
) != TYPE_DECL
)
3763 = (TREE_STATIC (decl
)
3764 /* Even if pedantic, an external linkage array
3765 may have incomplete type at first. */
3766 ? pedantic
&& !TREE_PUBLIC (decl
)
3767 : !DECL_EXTERNAL (decl
));
3769 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3771 /* Get the completed type made by complete_array_type. */
3772 type
= TREE_TYPE (decl
);
3775 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3780 error_with_decl (decl
, "array size missing in `%s'");
3781 /* If a `static' var's size isn't known,
3782 make it extern as well as static, so it does not get
3784 If it is not `static', then do not mark extern;
3785 finish_incomplete_decl will give it a default size
3786 and it will get allocated. */
3787 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3788 DECL_EXTERNAL (decl
) = 1;
3791 /* TYPE_MAX_VALUE is always one less than the number of elements
3792 in the array, because we start counting at zero. Therefore,
3793 warn only if the value is less than zero. */
3794 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3795 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3796 error_with_decl (decl
, "zero or negative size array `%s'");
3798 layout_decl (decl
, 0);
3801 if (TREE_CODE (decl
) == VAR_DECL
)
3803 if (DECL_SIZE (decl
) == 0
3804 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3805 layout_decl (decl
, 0);
3807 if (DECL_SIZE (decl
) == 0
3808 && (TREE_STATIC (decl
)
3810 /* A static variable with an incomplete type
3811 is an error if it is initialized.
3812 Also if it is not file scope.
3813 Otherwise, let it through, but if it is not `extern'
3814 then it may cause an error message later. */
3815 /* A duplicate_decls call could have changed an extern
3816 declaration into a file scope one. This can be detected
3817 by TREE_ASM_WRITTEN being set. */
3818 (DECL_INITIAL (decl
) != 0
3819 || DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
))
3821 /* An automatic variable with an incomplete type
3823 !DECL_EXTERNAL (decl
)))
3825 error_with_decl (decl
, "storage size of `%s' isn't known");
3826 TREE_TYPE (decl
) = error_mark_node
;
3829 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3830 && DECL_SIZE (decl
) != 0)
3832 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3833 constant_expression_warning (DECL_SIZE (decl
));
3835 error_with_decl (decl
, "storage size of `%s' isn't constant");
3839 /* If this is a function and an assembler name is specified, it isn't
3840 builtin any more. Also reset DECL_RTL so we can give it its new
3842 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3844 DECL_BUILT_IN (decl
) = 0;
3845 DECL_RTL (decl
) = 0;
3848 /* Output the assembler code and/or RTL code for variables and functions,
3849 unless the type is an undefined structure or union.
3850 If not, it will get done when the type is completed. */
3852 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3854 if ((flag_traditional
|| TREE_PERMANENT (decl
))
3855 && allocation_temporary_p ())
3857 push_obstacks_nochange ();
3858 end_temporary_allocation ();
3859 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3860 maybe_objc_check_decl (decl
);
3861 rest_of_decl_compilation (decl
, asmspec
,
3862 (DECL_CONTEXT (decl
) == 0
3863 || TREE_ASM_WRITTEN (decl
)),
3869 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3870 maybe_objc_check_decl (decl
);
3871 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3874 if (DECL_CONTEXT (decl
) != 0)
3876 /* Recompute the RTL of a local array now
3877 if it used to be an incomplete type. */
3879 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3881 /* If we used it already as memory, it must stay in memory. */
3882 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3883 /* If it's still incomplete now, no init will save it. */
3884 if (DECL_SIZE (decl
) == 0)
3885 DECL_INITIAL (decl
) = 0;
3888 /* Compute and store the initial value. */
3889 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3890 expand_decl_init (decl
);
3894 if (TREE_CODE (decl
) == TYPE_DECL
)
3896 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3897 maybe_objc_check_decl (decl
);
3898 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0,
3902 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3903 /* This test used to include TREE_PERMANENT, however, we have the same
3904 problem with initializers at the function level. Such initializers get
3905 saved until the end of the function on the momentary_obstack. */
3906 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
3908 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3909 space with DECL_ARG_TYPE. */
3910 && TREE_CODE (decl
) != PARM_DECL
)
3912 /* We need to remember that this array HAD an initialization,
3913 but discard the actual temporary nodes,
3914 since we can't have a permanent node keep pointing to them. */
3915 /* We make an exception for inline functions, since it's
3916 normal for a local extern redeclaration of an inline function
3917 to have a copy of the top-level decl's DECL_INLINE. */
3918 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
3920 /* If this is a const variable, then preserve the
3921 initializer instead of discarding it so that we can optimize
3922 references to it. */
3923 /* This test used to include TREE_STATIC, but this won't be set
3924 for function level initializers. */
3925 if (TREE_READONLY (decl
) || ITERATOR_P (decl
))
3927 preserve_initializer ();
3928 /* Hack? Set the permanent bit for something that is permanent,
3929 but not on the permanent obstack, so as to convince
3930 output_constant_def to make its rtl on the permanent
3932 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
3934 /* The initializer and DECL must have the same (or equivalent
3935 types), but if the initializer is a STRING_CST, its type
3936 might not be on the right obstack, so copy the type
3938 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3941 DECL_INITIAL (decl
) = error_mark_node
;
3945 /* If requested, warn about definitions of large data objects. */
3947 if (warn_larger_than
3948 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
3949 && !DECL_EXTERNAL (decl
))
3951 register tree decl_size
= DECL_SIZE (decl
);
3953 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
3955 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
3957 if (units
> larger_than_size
)
3958 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
3963 /* Resume permanent allocation, if not within a function. */
3964 /* The corresponding push_obstacks_nochange is in start_decl,
3965 and in push_parm_decl and in grokfield. */
3969 /* If we have gone back from temporary to permanent allocation,
3970 actually free the temporary space that we no longer need. */
3971 if (temporary
&& !allocation_temporary_p ())
3972 permanent_allocation (0);
3974 /* At the end of a declaration, throw away any variable type sizes
3975 of types defined inside that declaration. There is no use
3976 computing them in the following function definition. */
3977 if (current_binding_level
== global_binding_level
)
3978 get_pending_sizes ();
3981 /* If DECL has a cleanup, build and return that cleanup here.
3982 This is a callback called by expand_expr. */
3985 maybe_build_cleanup (decl
)
3988 /* There are no cleanups in C. */
3992 /* Given a parsed parameter declaration,
3993 decode it into a PARM_DECL and push that on the current binding level.
3994 Also, for the sake of forward parm decls,
3995 record the given order of parms in `parm_order'. */
3998 push_parm_decl (parm
)
4002 int old_immediate_size_expand
= immediate_size_expand
;
4003 /* Don't try computing parm sizes now -- wait till fn is called. */
4004 immediate_size_expand
= 0;
4006 /* The corresponding pop_obstacks is in finish_decl. */
4007 push_obstacks_nochange ();
4009 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
4010 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
4011 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
4012 TREE_PURPOSE (TREE_VALUE (parm
)));
4015 if (DECL_NAME (decl
))
4018 olddecl
= lookup_name (DECL_NAME (decl
));
4019 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
4020 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
4024 decl
= pushdecl (decl
);
4026 immediate_size_expand
= old_immediate_size_expand
;
4028 current_binding_level
->parm_order
4029 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
4031 /* Add this decl to the current binding level. */
4032 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
4035 /* Clear the given order of parms in `parm_order'.
4036 Used at start of parm list,
4037 and also at semicolon terminating forward decls. */
4042 current_binding_level
->parm_order
= NULL_TREE
;
4045 /* Make TYPE a complete type based on INITIAL_VALUE.
4046 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4047 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4050 complete_array_type (type
, initial_value
, do_default
)
4055 register tree maxindex
= NULL_TREE
;
4060 /* Note MAXINDEX is really the maximum index,
4061 one less than the size. */
4062 if (TREE_CODE (initial_value
) == STRING_CST
)
4065 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
4066 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
4069 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
4071 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
4072 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
4073 for (; elts
; elts
= TREE_CHAIN (elts
))
4075 if (TREE_PURPOSE (elts
))
4076 maxindex
= TREE_PURPOSE (elts
);
4078 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
4080 maxindex
= copy_node (maxindex
);
4084 /* Make an error message unless that happened already. */
4085 if (initial_value
!= error_mark_node
)
4088 /* Prevent further error messages. */
4089 maxindex
= build_int_2 (0, 0);
4096 maxindex
= build_int_2 (0, 0);
4102 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
4103 if (!TREE_TYPE (maxindex
))
4104 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
4105 #if 0 /* I took out this change
4106 together with the change in build_array_type. --rms */
4107 change_main_variant (type
,
4108 build_array_type (TREE_TYPE (type
),
4109 TYPE_DOMAIN (type
)));
4113 /* Lay out the type now that we can get the real answer. */
4120 /* Given declspecs and a declarator,
4121 determine the name and type of the object declared
4122 and construct a ..._DECL node for it.
4123 (In one case we can return a ..._TYPE node instead.
4124 For invalid input we sometimes return 0.)
4126 DECLSPECS is a chain of tree_list nodes whose value fields
4127 are the storage classes and type specifiers.
4129 DECL_CONTEXT says which syntactic context this declaration is in:
4130 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4131 FUNCDEF for a function definition. Like NORMAL but a few different
4132 error messages in each case. Return value may be zero meaning
4133 this definition is too screwy to try to parse.
4134 PARM for a parameter declaration (either within a function prototype
4135 or before a function body). Make a PARM_DECL, or return void_type_node.
4136 TYPENAME if for a typename (in a cast or sizeof).
4137 Don't make a DECL node; just return the ..._TYPE node.
4138 FIELD for a struct or union field; make a FIELD_DECL.
4139 BITFIELD for a field with specified width.
4140 INITIALIZED is 1 if the decl has an initializer.
4142 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4143 It may also be so in the PARM case, for a prototype where the
4144 argument type is specified but not the name.
4146 This function is where the complicated C meanings of `static'
4147 and `extern' are interpreted. */
4150 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4153 enum decl_context decl_context
;
4158 tree type
= NULL_TREE
;
4163 int explicit_int
= 0;
4164 int explicit_char
= 0;
4165 int defaulted_int
= 0;
4166 tree typedef_decl
= 0;
4168 tree typedef_type
= 0;
4169 int funcdef_flag
= 0;
4170 enum tree_code innermost_code
= ERROR_MARK
;
4172 int size_varies
= 0;
4173 tree decl_machine_attr
= NULL_TREE
;
4175 if (decl_context
== BITFIELD
)
4176 bitfield
= 1, decl_context
= FIELD
;
4178 if (decl_context
== FUNCDEF
)
4179 funcdef_flag
= 1, decl_context
= NORMAL
;
4181 push_obstacks_nochange ();
4183 if (flag_traditional
&& allocation_temporary_p ())
4184 end_temporary_allocation ();
4186 /* Look inside a declarator for the name being declared
4187 and get it as a string, for an error message. */
4189 register tree decl
= declarator
;
4193 switch (TREE_CODE (decl
))
4198 innermost_code
= TREE_CODE (decl
);
4199 decl
= TREE_OPERAND (decl
, 0);
4202 case IDENTIFIER_NODE
:
4203 name
= IDENTIFIER_POINTER (decl
);
4214 /* A function definition's declarator must have the form of
4215 a function declarator. */
4217 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4220 /* Anything declared one level down from the top level
4221 must be one of the parameters of a function
4222 (because the body is at least two levels down). */
4224 /* If this looks like a function definition, make it one,
4225 even if it occurs where parms are expected.
4226 Then store_parm_decls will reject it and not use it as a parm. */
4227 if (decl_context
== NORMAL
&& !funcdef_flag
4228 && current_binding_level
->parm_flag
)
4229 decl_context
= PARM
;
4231 /* Look through the decl specs and record which ones appear.
4232 Some typespecs are defined as built-in typenames.
4233 Others, the ones that are modifiers of other types,
4234 are represented by bits in SPECBITS: set the bits for
4235 the modifiers that appear. Storage class keywords are also in SPECBITS.
4237 If there is a typedef name or a type, store the type in TYPE.
4238 This includes builtin typedefs such as `int'.
4240 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4241 and did not come from a user typedef.
4243 Set LONGLONG if `long' is mentioned twice. */
4245 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4248 register tree id
= TREE_VALUE (spec
);
4250 if (id
== ridpointers
[(int) RID_INT
])
4252 if (id
== ridpointers
[(int) RID_CHAR
])
4255 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4256 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
4258 if (ridpointers
[i
] == id
)
4260 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
4263 error ("`long long long' is too long for GCC");
4266 if (pedantic
&& ! in_system_header
)
4267 pedwarn ("ANSI C does not support `long long'");
4271 else if (specbits
& (1 << i
))
4272 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4278 error ("two or more data types in declaration of `%s'", name
);
4279 /* Actual typedefs come to us as TYPE_DECL nodes. */
4280 else if (TREE_CODE (id
) == TYPE_DECL
)
4282 type
= TREE_TYPE (id
);
4283 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4286 /* Built-in types come as identifiers. */
4287 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4289 register tree t
= lookup_name (id
);
4290 if (TREE_TYPE (t
) == error_mark_node
)
4292 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4293 error ("`%s' fails to be a typedef or built in type",
4294 IDENTIFIER_POINTER (id
));
4297 type
= TREE_TYPE (t
);
4301 else if (TREE_CODE (id
) != ERROR_MARK
)
4307 typedef_type
= type
;
4309 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4311 /* No type at all: default to `int', and set DEFAULTED_INT
4312 because it was not a user-defined typedef. */
4316 if (! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4317 | (1 << (int) RID_SIGNED
)
4318 | (1 << (int) RID_UNSIGNED
))))
4320 /* C9x will probably require a diagnostic here.
4321 For now, issue a warning if -Wreturn-type and this is a function,
4322 or if -Wimplicit; prefer the former warning since it is more
4324 if ((warn_implicit
|| warn_return_type
) && funcdef_flag
)
4325 warn_about_return_type
= 1;
4326 else if (warn_implicit
)
4327 warning ("type defaults to `int' in declaration of `%s'", name
);
4331 type
= integer_type_node
;
4334 /* Now process the modifiers that were specified
4335 and check for invalid combinations. */
4337 /* Long double is a special combination. */
4339 if ((specbits
& 1 << (int) RID_LONG
)
4340 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4342 specbits
&= ~ (1 << (int) RID_LONG
);
4343 type
= long_double_type_node
;
4346 /* Check all other uses of type modifiers. */
4348 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4349 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4353 if (TREE_CODE (type
) != INTEGER_TYPE
)
4354 error ("long, short, signed or unsigned invalid for `%s'", name
);
4355 else if ((specbits
& 1 << (int) RID_LONG
)
4356 && (specbits
& 1 << (int) RID_SHORT
))
4357 error ("long and short specified together for `%s'", name
);
4358 else if (((specbits
& 1 << (int) RID_LONG
)
4359 || (specbits
& 1 << (int) RID_SHORT
))
4361 error ("long or short specified with char for `%s'", name
);
4362 else if (((specbits
& 1 << (int) RID_LONG
)
4363 || (specbits
& 1 << (int) RID_SHORT
))
4364 && TREE_CODE (type
) == REAL_TYPE
)
4365 error ("long or short specified with floating type for `%s'", name
);
4366 else if ((specbits
& 1 << (int) RID_SIGNED
)
4367 && (specbits
& 1 << (int) RID_UNSIGNED
))
4368 error ("signed and unsigned given together for `%s'", name
);
4372 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4374 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4376 if (flag_pedantic_errors
)
4381 /* Discard the type modifiers if they are invalid. */
4384 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4385 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4390 if ((specbits
& (1 << (int) RID_COMPLEX
))
4391 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4393 error ("complex invalid for `%s'", name
);
4394 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4397 /* Decide whether an integer type is signed or not.
4398 Optionally treat bitfields as signed by default. */
4399 if (specbits
& 1 << (int) RID_UNSIGNED
4400 /* Traditionally, all bitfields are unsigned. */
4401 || (bitfield
&& flag_traditional
4402 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4403 || (bitfield
&& ! flag_signed_bitfields
4404 && (explicit_int
|| defaulted_int
|| explicit_char
4405 /* A typedef for plain `int' without `signed'
4406 can be controlled just like plain `int'. */
4407 || ! (typedef_decl
!= 0
4408 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4409 && TREE_CODE (type
) != ENUMERAL_TYPE
4410 && !(specbits
& 1 << (int) RID_SIGNED
)))
4413 type
= long_long_unsigned_type_node
;
4414 else if (specbits
& 1 << (int) RID_LONG
)
4415 type
= long_unsigned_type_node
;
4416 else if (specbits
& 1 << (int) RID_SHORT
)
4417 type
= short_unsigned_type_node
;
4418 else if (type
== char_type_node
)
4419 type
= unsigned_char_type_node
;
4420 else if (typedef_decl
)
4421 type
= unsigned_type (type
);
4423 type
= unsigned_type_node
;
4425 else if ((specbits
& 1 << (int) RID_SIGNED
)
4426 && type
== char_type_node
)
4427 type
= signed_char_type_node
;
4429 type
= long_long_integer_type_node
;
4430 else if (specbits
& 1 << (int) RID_LONG
)
4431 type
= long_integer_type_node
;
4432 else if (specbits
& 1 << (int) RID_SHORT
)
4433 type
= short_integer_type_node
;
4435 if (specbits
& 1 << (int) RID_COMPLEX
)
4437 /* If we just have "complex", it is equivalent to
4438 "complex double", but if any modifiers at all are specified it is
4439 the complex form of TYPE. E.g, "complex short" is
4440 "complex short int". */
4442 if (defaulted_int
&& ! longlong
4443 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4444 | (1 << (int) RID_SIGNED
)
4445 | (1 << (int) RID_UNSIGNED
))))
4446 type
= complex_double_type_node
;
4447 else if (type
== integer_type_node
)
4448 type
= complex_integer_type_node
;
4449 else if (type
== float_type_node
)
4450 type
= complex_float_type_node
;
4451 else if (type
== double_type_node
)
4452 type
= complex_double_type_node
;
4453 else if (type
== long_double_type_node
)
4454 type
= complex_long_double_type_node
;
4456 type
= build_complex_type (type
);
4459 /* Set CONSTP if this declaration is `const', whether by
4460 explicit specification or via a typedef.
4461 Likewise for VOLATILEP. */
4463 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4464 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4465 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4467 pedwarn ("duplicate `const'");
4469 pedwarn ("duplicate `volatile'");
4470 if (! flag_gen_aux_info
&& (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)))
4471 type
= TYPE_MAIN_VARIANT (type
);
4473 /* Warn if two storage classes are given. Default to `auto'. */
4478 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4479 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4480 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4481 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4482 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4483 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4485 /* Warn about storage classes that are invalid for certain
4486 kinds of declarations (parameters, typenames, etc.). */
4489 error ("multiple storage classes in declaration of `%s'", name
);
4490 else if (funcdef_flag
4492 & ((1 << (int) RID_REGISTER
)
4493 | (1 << (int) RID_AUTO
)
4494 | (1 << (int) RID_TYPEDEF
))))
4496 if (specbits
& 1 << (int) RID_AUTO
4497 && (pedantic
|| current_binding_level
== global_binding_level
))
4498 pedwarn ("function definition declared `auto'");
4499 if (specbits
& 1 << (int) RID_REGISTER
)
4500 error ("function definition declared `register'");
4501 if (specbits
& 1 << (int) RID_TYPEDEF
)
4502 error ("function definition declared `typedef'");
4503 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4504 | (1 << (int) RID_AUTO
));
4506 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4508 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4512 error ((decl_context
== FIELD
4513 ? "storage class specified for structure field `%s'"
4514 : (decl_context
== PARM
4515 ? "storage class specified for parameter `%s'"
4516 : "storage class specified for typename")),
4518 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4519 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4520 | (1 << (int) RID_EXTERN
));
4523 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4525 /* `extern' with initialization is invalid if not at top level. */
4526 if (current_binding_level
== global_binding_level
)
4527 warning ("`%s' initialized and declared `extern'", name
);
4529 error ("`%s' has both `extern' and initializer", name
);
4531 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4532 && current_binding_level
!= global_binding_level
)
4533 error ("nested function `%s' declared `extern'", name
);
4534 else if (current_binding_level
== global_binding_level
4535 && specbits
& (1 << (int) RID_AUTO
))
4536 error ("top-level declaration of `%s' specifies `auto'", name
);
4537 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4538 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4540 error ("iterator `%s' has derived type", name
);
4541 type
= error_mark_node
;
4543 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4544 && TREE_CODE (type
) != INTEGER_TYPE
)
4546 error ("iterator `%s' has noninteger type", name
);
4547 type
= error_mark_node
;
4551 /* Now figure out the structure of the declarator proper.
4552 Descend through it, creating more complex types, until we reach
4553 the declared identifier (or NULL_TREE, in an absolute declarator). */
4555 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4557 if (type
== error_mark_node
)
4559 declarator
= TREE_OPERAND (declarator
, 0);
4563 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4564 an INDIRECT_REF (for *...),
4565 a CALL_EXPR (for ...(...)),
4566 an identifier (for the name being declared)
4567 or a null pointer (for the place in an absolute declarator
4568 where the name was omitted).
4569 For the last two cases, we have just exited the loop.
4571 At this point, TYPE is the type of elements of an array,
4572 or for a function to return, or for a pointer to point to.
4573 After this sequence of ifs, TYPE is the type of the
4574 array or function or pointer, and DECLARATOR has had its
4575 outermost layer removed. */
4577 if (TREE_CODE (declarator
) == ARRAY_REF
)
4579 register tree itype
= NULL_TREE
;
4580 register tree size
= TREE_OPERAND (declarator
, 1);
4581 /* An uninitialized decl with `extern' is a reference. */
4582 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4583 /* The index is a signed object `sizetype' bits wide. */
4584 tree index_type
= signed_type (sizetype
);
4586 declarator
= TREE_OPERAND (declarator
, 0);
4588 /* Check for some types that there cannot be arrays of. */
4590 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4592 error ("declaration of `%s' as array of voids", name
);
4593 type
= error_mark_node
;
4596 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4598 error ("declaration of `%s' as array of functions", name
);
4599 type
= error_mark_node
;
4602 if (size
== error_mark_node
)
4603 type
= error_mark_node
;
4605 if (type
== error_mark_node
)
4608 /* If this is a block level extern, it must live past the end
4609 of the function so that we can check it against other extern
4610 declarations (IDENTIFIER_LIMBO_VALUE). */
4611 if (extern_ref
&& allocation_temporary_p ())
4612 end_temporary_allocation ();
4614 /* If size was specified, set ITYPE to a range-type for that size.
4615 Otherwise, ITYPE remains null. finish_decl may figure it out
4616 from an initial value. */
4620 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4621 STRIP_TYPE_NOPS (size
);
4623 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4624 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4626 error ("size of array `%s' has non-integer type", name
);
4627 size
= integer_one_node
;
4630 if (pedantic
&& integer_zerop (size
))
4631 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4633 if (TREE_CODE (size
) == INTEGER_CST
)
4635 constant_expression_warning (size
);
4636 if (tree_int_cst_sgn (size
) < 0)
4638 error ("size of array `%s' is negative", name
);
4639 size
= integer_one_node
;
4644 /* Make sure the array size remains visibly nonconstant
4645 even if it is (eg) a const variable with known value. */
4650 if (TREE_CONSTANT (size
))
4651 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4653 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4657 /* Convert size to index_type, so that if it is a variable
4658 the computations will be done in the proper mode. */
4659 itype
= fold (build (MINUS_EXPR
, index_type
,
4660 convert (index_type
, size
),
4661 convert (index_type
, size_one_node
)));
4664 itype
= variable_size (itype
);
4665 itype
= build_index_type (itype
);
4668 #if 0 /* This had bad results for pointers to arrays, as in
4669 union incomplete (*foo)[4]; */
4670 /* Complain about arrays of incomplete types, except in typedefs. */
4672 if (TYPE_SIZE (type
) == 0
4673 /* Avoid multiple warnings for nested array types. */
4674 && TREE_CODE (type
) != ARRAY_TYPE
4675 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4676 && !C_TYPE_BEING_DEFINED (type
))
4677 warning ("array type has incomplete element type");
4680 #if 0 /* We shouldn't have a function type here at all!
4681 Functions aren't allowed as array elements. */
4682 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4683 && (constp
|| volatilep
))
4684 pedwarn ("ANSI C forbids const or volatile function types");
4687 /* Build the array type itself, then merge any constancy or
4688 volatility into the target type. We must do it in this order
4689 to ensure that the TYPE_MAIN_VARIANT field of the array type
4690 is set correctly. */
4692 type
= build_array_type (type
, itype
);
4693 if (constp
|| volatilep
)
4694 type
= c_build_type_variant (type
, constp
, volatilep
);
4696 #if 0 /* don't clear these; leave them set so that the array type
4697 or the variable is itself const or volatile. */
4703 C_TYPE_VARIABLE_SIZE (type
) = 1;
4705 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4707 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4708 || current_binding_level
== global_binding_level
);
4711 /* Declaring a function type.
4712 Make sure we have a valid type for the function to return. */
4713 if (type
== error_mark_node
)
4718 /* Warn about some types functions can't return. */
4720 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4722 error ("`%s' declared as function returning a function", name
);
4723 type
= integer_type_node
;
4725 if (TREE_CODE (type
) == ARRAY_TYPE
)
4727 error ("`%s' declared as function returning an array", name
);
4728 type
= integer_type_node
;
4731 #ifndef TRADITIONAL_RETURN_FLOAT
4732 /* Traditionally, declaring return type float means double. */
4734 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4735 type
= double_type_node
;
4736 #endif /* TRADITIONAL_RETURN_FLOAT */
4738 /* If this is a block level extern, it must live past the end
4739 of the function so that we can check it against other extern
4740 declarations (IDENTIFIER_LIMBO_VALUE). */
4741 if (extern_ref
&& allocation_temporary_p ())
4742 end_temporary_allocation ();
4744 /* Construct the function type and go to the next
4745 inner layer of declarator. */
4747 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4749 /* Say it's a definition
4750 only for the CALL_EXPR
4751 closest to the identifier. */
4752 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4753 #if 0 /* This seems to be false. We turn off temporary allocation
4754 above in this function if -traditional.
4755 And this code caused inconsistent results with prototypes:
4756 callers would ignore them, and pass arguments wrong. */
4758 /* Omit the arg types if -traditional, since the arg types
4759 and the list links might not be permanent. */
4760 type
= build_function_type (type
,
4762 ? NULL_TREE
: arg_types
);
4764 /* ANSI seems to say that `const int foo ();'
4765 does not make the function foo const. */
4766 if (constp
|| volatilep
)
4767 type
= c_build_type_variant (type
, constp
, volatilep
);
4771 type
= build_function_type (type
, arg_types
);
4772 declarator
= TREE_OPERAND (declarator
, 0);
4774 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4775 the formal parameter list of this FUNCTION_TYPE to point to
4776 the FUNCTION_TYPE node itself. */
4781 for (link
= current_function_parm_tags
;
4783 link
= TREE_CHAIN (link
))
4784 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4787 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4789 /* Merge any constancy or volatility into the target type
4792 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4793 && (constp
|| volatilep
))
4794 pedwarn ("ANSI C forbids const or volatile function types");
4795 if (constp
|| volatilep
)
4796 type
= c_build_type_variant (type
, constp
, volatilep
);
4801 type
= build_pointer_type (type
);
4803 /* Process a list of type modifier keywords
4804 (such as const or volatile) that were given inside the `*'. */
4806 if (TREE_TYPE (declarator
))
4808 register tree typemodlist
;
4810 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4811 typemodlist
= TREE_CHAIN (typemodlist
))
4813 if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_CONST
])
4815 else if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_VOLATILE
])
4820 error ("invalid type modifier within pointer declarator");
4824 pedwarn ("duplicate `const'");
4826 pedwarn ("duplicate `volatile'");
4829 declarator
= TREE_OPERAND (declarator
, 0);
4836 /* Now TYPE has the actual type. */
4838 /* If this is declaring a typedef name, return a TYPE_DECL. */
4840 if (specbits
& (1 << (int) RID_TYPEDEF
))
4843 /* Note that the grammar rejects storage classes
4844 in typenames, fields or parameters */
4845 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4846 && (constp
|| volatilep
))
4847 pedwarn ("ANSI C forbids const or volatile function types");
4848 if (constp
|| volatilep
)
4849 type
= c_build_type_variant (type
, constp
, volatilep
);
4850 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4851 if ((specbits
& (1 << (int) RID_SIGNED
))
4852 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4853 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4858 /* Detect the case of an array type of unspecified size
4859 which came, as such, direct from a typedef name.
4860 We must copy the type, so that each identifier gets
4861 a distinct type, so that each identifier's size can be
4862 controlled separately by its own initializer. */
4864 if (type
!= 0 && typedef_type
!= 0
4865 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4866 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4868 type
= build_array_type (TREE_TYPE (type
), 0);
4870 C_TYPE_VARIABLE_SIZE (type
) = 1;
4873 /* If this is a type name (such as, in a cast or sizeof),
4874 compute the type and return it now. */
4876 if (decl_context
== TYPENAME
)
4878 /* Note that the grammar rejects storage classes
4879 in typenames, fields or parameters */
4880 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4881 && (constp
|| volatilep
))
4882 pedwarn ("ANSI C forbids const or volatile function types");
4883 if (constp
|| volatilep
)
4884 type
= c_build_type_variant (type
, constp
, volatilep
);
4889 /* Aside from typedefs and type names (handle above),
4890 `void' at top level (not within pointer)
4891 is allowed only in public variables.
4892 We don't complain about parms either, but that is because
4893 a better error message can be made later. */
4895 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4896 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4897 && ((specbits
& (1 << (int) RID_EXTERN
))
4898 || (current_binding_level
== global_binding_level
4900 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4902 error ("variable or field `%s' declared void", name
);
4903 type
= integer_type_node
;
4906 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4907 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4912 if (decl_context
== PARM
)
4914 tree type_as_written
= type
;
4917 /* A parameter declared as an array of T is really a pointer to T.
4918 One declared as a function is really a pointer to a function. */
4920 if (TREE_CODE (type
) == ARRAY_TYPE
)
4922 /* Transfer const-ness of array into that of type pointed to. */
4923 type
= TREE_TYPE (type
);
4924 if (constp
|| volatilep
)
4925 type
= c_build_type_variant (type
, constp
, volatilep
);
4926 type
= build_pointer_type (type
);
4927 volatilep
= constp
= 0;
4930 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4932 if (pedantic
&& (constp
|| volatilep
))
4933 pedwarn ("ANSI C forbids const or volatile function types");
4934 if (constp
|| volatilep
)
4935 type
= c_build_type_variant (type
, constp
, volatilep
);
4936 type
= build_pointer_type (type
);
4937 volatilep
= constp
= 0;
4940 decl
= build_decl (PARM_DECL
, declarator
, type
);
4942 C_DECL_VARIABLE_SIZE (decl
) = 1;
4944 /* Compute the type actually passed in the parmlist,
4945 for the case where there is no prototype.
4946 (For example, shorts and chars are passed as ints.)
4947 When there is a prototype, this is overridden later. */
4949 DECL_ARG_TYPE (decl
) = type
;
4950 main_type
= (type
== error_mark_node
4952 : TYPE_MAIN_VARIANT (type
));
4953 if (main_type
== float_type_node
)
4954 DECL_ARG_TYPE (decl
) = double_type_node
;
4955 /* Don't use TYPE_PRECISION to decide whether to promote,
4956 because we should convert short if it's the same size as int,
4957 but we should not convert long if it's the same size as int. */
4958 else if (TREE_CODE (main_type
) != ERROR_MARK
4959 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
4961 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
4962 && TREE_UNSIGNED (type
))
4963 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
4965 DECL_ARG_TYPE (decl
) = integer_type_node
;
4968 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4970 else if (decl_context
== FIELD
)
4972 /* Structure field. It may not be a function. */
4974 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4976 error ("field `%s' declared as a function", name
);
4977 type
= build_pointer_type (type
);
4979 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
4981 error ("field `%s' has incomplete type", name
);
4982 type
= error_mark_node
;
4984 /* Move type qualifiers down to element of an array. */
4985 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4987 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4989 TYPE_DOMAIN (type
));
4990 #if 0 /* Leave the field const or volatile as well. */
4991 constp
= volatilep
= 0;
4994 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4996 C_DECL_VARIABLE_SIZE (decl
) = 1;
4998 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5000 /* Every function declaration is "external"
5001 except for those which are inside a function body
5002 in which `auto' is used.
5003 That is a case not specified by ANSI C,
5004 and we use it for forward declarations for nested functions. */
5005 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
5006 || current_binding_level
== global_binding_level
);
5008 if (specbits
& (1 << (int) RID_AUTO
)
5009 && (pedantic
|| current_binding_level
== global_binding_level
))
5010 pedwarn ("invalid storage class for function `%s'", name
);
5011 if (specbits
& (1 << (int) RID_REGISTER
))
5012 error ("invalid storage class for function `%s'", name
);
5013 /* Function declaration not at top level.
5014 Storage classes other than `extern' are not allowed
5015 and `extern' makes no difference. */
5016 if (current_binding_level
!= global_binding_level
5017 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
5019 pedwarn ("invalid storage class for function `%s'", name
);
5021 /* If this is a block level extern, it must live past the end
5022 of the function so that we can check it against other
5023 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5024 if (extern_ref
&& allocation_temporary_p ())
5025 end_temporary_allocation ();
5027 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
5028 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
5030 if (pedantic
&& (constp
|| volatilep
)
5031 && ! DECL_IN_SYSTEM_HEADER (decl
))
5032 pedwarn ("ANSI C forbids const or volatile functions");
5035 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
5036 warning ("`noreturn' function returns non-void value");
5039 DECL_EXTERNAL (decl
) = 1;
5040 /* Record absence of global scope for `static' or `auto'. */
5042 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
5044 /* Record presence of `inline', if it is reasonable. */
5047 tree last
= tree_last (TYPE_ARG_TYPES (type
));
5049 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
5050 warning ("cannot inline function `main'");
5051 else if (last
&& (TYPE_MAIN_VARIANT (TREE_VALUE (last
))
5053 warning ("inline declaration ignored for function with `...'");
5055 /* Assume that otherwise the function can be inlined. */
5056 DECL_INLINE (decl
) = 1;
5058 if (specbits
& (1 << (int) RID_EXTERN
))
5059 current_extern_inline
= 1;
5064 /* It's a variable. */
5065 /* An uninitialized decl with `extern' is a reference. */
5066 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
5068 /* Move type qualifiers down to element of an array. */
5069 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
5071 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
5073 TYPE_DOMAIN (type
));
5074 #if 0 /* Leave the variable const or volatile as well. */
5075 constp
= volatilep
= 0;
5079 /* If this is a block level extern, it must live past the end
5080 of the function so that we can check it against other
5081 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5082 if (extern_ref
&& allocation_temporary_p ())
5083 end_temporary_allocation ();
5085 decl
= build_decl (VAR_DECL
, declarator
, type
);
5087 C_DECL_VARIABLE_SIZE (decl
) = 1;
5090 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
5092 DECL_EXTERNAL (decl
) = extern_ref
;
5093 /* At top level, the presence of a `static' or `register' storage
5094 class specifier, or the absence of all storage class specifiers
5095 makes this declaration a definition (perhaps tentative). Also,
5096 the absence of both `static' and `register' makes it public. */
5097 if (current_binding_level
== global_binding_level
)
5101 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
5102 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
5104 /* Not at top level, only `static' makes a static definition. */
5107 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
5108 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
5111 if (specbits
& 1 << (int) RID_ITERATOR
)
5112 ITERATOR_P (decl
) = 1;
5115 /* Record `register' declaration for warnings on &
5116 and in case doing stupid register allocation. */
5118 if (specbits
& (1 << (int) RID_REGISTER
))
5119 DECL_REGISTER (decl
) = 1;
5121 /* Record constancy and volatility. */
5124 TREE_READONLY (decl
) = 1;
5127 TREE_SIDE_EFFECTS (decl
) = 1;
5128 TREE_THIS_VOLATILE (decl
) = 1;
5130 /* If a type has volatile components, it should be stored in memory.
5131 Otherwise, the fact that those components are volatile
5132 will be ignored, and would even crash the compiler. */
5133 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5134 mark_addressable (decl
);
5142 /* Decode the parameter-list info for a function type or function definition.
5143 The argument is the value returned by `get_parm_info' (or made in parse.y
5144 if there is an identifier list instead of a parameter decl list).
5145 These two functions are separate because when a function returns
5146 or receives functions then each is called multiple times but the order
5147 of calls is different. The last call to `grokparms' is always the one
5148 that contains the formal parameter names of a function definition.
5150 Store in `last_function_parms' a chain of the decls of parms.
5151 Also store in `last_function_parm_tags' a chain of the struct, union,
5152 and enum tags declared among the parms.
5154 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5156 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5157 a mere declaration. A nonempty identifier-list gets an error message
5158 when FUNCDEF_FLAG is zero. */
5161 grokparms (parms_info
, funcdef_flag
)
5165 tree first_parm
= TREE_CHAIN (parms_info
);
5167 last_function_parms
= TREE_PURPOSE (parms_info
);
5168 last_function_parm_tags
= TREE_VALUE (parms_info
);
5170 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5171 && !in_system_header
)
5172 warning ("function declaration isn't a prototype");
5175 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5178 pedwarn ("parameter names (without types) in function declaration");
5180 last_function_parms
= first_parm
;
5187 /* We no longer test FUNCDEF_FLAG.
5188 If the arg types are incomplete in a declaration,
5189 they must include undefined tags.
5190 These tags can never be defined in the scope of the declaration,
5191 so the types can never be completed,
5192 and no call can be compiled successfully. */
5194 /* In a fcn definition, arg types must be complete. */
5197 for (parm
= last_function_parms
, typelt
= first_parm
;
5199 parm
= TREE_CHAIN (parm
))
5200 /* Skip over any enumeration constants declared here. */
5201 if (TREE_CODE (parm
) == PARM_DECL
)
5203 /* Barf if the parameter itself has an incomplete type. */
5204 tree type
= TREE_VALUE (typelt
);
5205 if (TYPE_SIZE (type
) == 0)
5207 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5208 error ("parameter `%s' has incomplete type",
5209 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5211 warning ("parameter has incomplete type");
5214 TREE_VALUE (typelt
) = error_mark_node
;
5215 TREE_TYPE (parm
) = error_mark_node
;
5218 #if 0 /* This has been replaced by parm_tags_warning
5219 which uses a more accurate criterion for what to warn about. */
5222 /* Now warn if is a pointer to an incomplete type. */
5223 while (TREE_CODE (type
) == POINTER_TYPE
5224 || TREE_CODE (type
) == REFERENCE_TYPE
)
5225 type
= TREE_TYPE (type
);
5226 type
= TYPE_MAIN_VARIANT (type
);
5227 if (TYPE_SIZE (type
) == 0)
5229 if (DECL_NAME (parm
) != 0)
5230 warning ("parameter `%s' points to incomplete type",
5231 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5233 warning ("parameter points to incomplete type");
5237 typelt
= TREE_CHAIN (typelt
);
5240 /* Allocate the list of types the way we allocate a type. */
5241 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
5243 /* Construct a copy of the list of types
5244 on the saveable obstack. */
5246 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
5247 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
5249 return nreverse (result
);
5252 /* The list we have is permanent already. */
5258 /* Return a tree_list node with info on a parameter list just parsed.
5259 The TREE_PURPOSE is a chain of decls of those parms.
5260 The TREE_VALUE is a list of structure, union and enum tags defined.
5261 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5262 This tree_list node is later fed to `grokparms'.
5264 VOID_AT_END nonzero means append `void' to the end of the type-list.
5265 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5268 get_parm_info (void_at_end
)
5271 register tree decl
, t
;
5272 register tree types
= 0;
5274 tree tags
= gettags ();
5275 tree parms
= getdecls ();
5277 tree order
= current_binding_level
->parm_order
;
5279 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5280 if (void_at_end
&& parms
!= 0
5281 && TREE_CHAIN (parms
) == 0
5282 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
5283 && DECL_NAME (parms
) == 0)
5286 storedecls (NULL_TREE
);
5287 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
5288 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5291 /* Extract enumerator values and other non-parms declared with the parms.
5292 Likewise any forward parm decls that didn't have real parm decls. */
5293 for (decl
= parms
; decl
; )
5295 tree next
= TREE_CHAIN (decl
);
5297 if (TREE_CODE (decl
) != PARM_DECL
)
5299 TREE_CHAIN (decl
) = new_parms
;
5302 else if (TREE_ASM_WRITTEN (decl
))
5304 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
5305 TREE_CHAIN (decl
) = new_parms
;
5311 /* Put the parm decls back in the order they were in in the parm list. */
5312 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5315 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5317 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5320 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5323 /* Store the parmlist in the binding level since the old one
5324 is no longer a valid list. (We have changed the chain pointers.) */
5325 storedecls (new_parms
);
5327 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5328 /* There may also be declarations for enumerators if an enumeration
5329 type is declared among the parms. Ignore them here. */
5330 if (TREE_CODE (decl
) == PARM_DECL
)
5332 /* Since there is a prototype,
5333 args are passed in their declared types. */
5334 tree type
= TREE_TYPE (decl
);
5335 DECL_ARG_TYPE (decl
) = type
;
5336 #ifdef PROMOTE_PROTOTYPES
5337 if ((TREE_CODE (type
) == INTEGER_TYPE
5338 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5339 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5340 DECL_ARG_TYPE (decl
) = integer_type_node
;
5343 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5344 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5345 && DECL_NAME (decl
) == 0)
5347 error ("`void' in parameter list must be the entire list");
5353 return saveable_tree_cons (new_parms
, tags
,
5354 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5356 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5359 /* At end of parameter list, warn about any struct, union or enum tags
5360 defined within. Do so because these types cannot ever become complete. */
5363 parmlist_tags_warning ()
5368 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5370 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5371 /* An anonymous union parm type is meaningful as a GNU extension.
5372 So don't warn for that. */
5373 if (code
== UNION_TYPE
&& !pedantic
)
5375 if (TREE_PURPOSE (elt
) != 0)
5376 warning ("`%s %s' declared inside parameter list",
5377 (code
== RECORD_TYPE
? "struct"
5378 : code
== UNION_TYPE
? "union"
5380 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5382 warning ("anonymous %s declared inside parameter list",
5383 (code
== RECORD_TYPE
? "struct"
5384 : code
== UNION_TYPE
? "union"
5389 warning ("its scope is only this definition or declaration,");
5390 warning ("which is probably not what you want.");
5396 /* Get the struct, enum or union (CODE says which) with tag NAME.
5397 Define the tag as a forward-reference if it is not defined. */
5400 xref_tag (code
, name
)
5401 enum tree_code code
;
5404 int temporary
= allocation_temporary_p ();
5406 /* If a cross reference is requested, look up the type
5407 already defined for this tag and return it. */
5409 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5410 /* Even if this is the wrong type of tag, return what we found.
5411 There will be an error message anyway, from pending_xref_error.
5412 If we create an empty xref just for an invalid use of the type,
5413 the main result is to create lots of superfluous error messages. */
5417 push_obstacks_nochange ();
5419 if (current_binding_level
== global_binding_level
&& temporary
)
5420 end_temporary_allocation ();
5422 /* If no such tag is yet defined, create a forward-reference node
5423 and record it as the "definition".
5424 When a real declaration of this type is found,
5425 the forward-reference will be altered into a real type. */
5427 ref
= make_node (code
);
5428 if (code
== ENUMERAL_TYPE
)
5430 /* (In ANSI, Enums can be referred to only if already defined.) */
5432 pedwarn ("ANSI C forbids forward references to `enum' types");
5433 /* Give the type a default layout like unsigned int
5434 to avoid crashing if it does not get defined. */
5435 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5436 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5437 TREE_UNSIGNED (ref
) = 1;
5438 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5439 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5440 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5443 pushtag (name
, ref
);
5450 /* Make sure that the tag NAME is defined *in the current binding level*
5451 at least as a forward reference.
5452 CODE says which kind of tag NAME ought to be.
5454 We also do a push_obstacks_nochange
5455 whose matching pop is in finish_struct. */
5458 start_struct (code
, name
)
5459 enum tree_code code
;
5462 /* If there is already a tag defined at this binding level
5463 (as a forward reference), just return it. */
5465 register tree ref
= 0;
5467 push_obstacks_nochange ();
5468 if (current_binding_level
== global_binding_level
)
5469 end_temporary_allocation ();
5472 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5473 if (ref
&& TREE_CODE (ref
) == code
)
5475 C_TYPE_BEING_DEFINED (ref
) = 1;
5476 if (TYPE_FIELDS (ref
))
5477 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5478 : "redefinition of `struct %s'"),
5479 IDENTIFIER_POINTER (name
));
5484 /* Otherwise create a forward-reference just so the tag is in scope. */
5486 ref
= make_node (code
);
5487 pushtag (name
, ref
);
5488 C_TYPE_BEING_DEFINED (ref
) = 1;
5489 TYPE_PACKED (ref
) = flag_pack_struct
;
5493 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5494 of a structure component, returning a FIELD_DECL node.
5495 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5497 This is done during the parsing of the struct declaration.
5498 The FIELD_DECL nodes are chained together and the lot of them
5499 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5502 grokfield (filename
, line
, declarator
, declspecs
, width
)
5505 tree declarator
, declspecs
, width
;
5509 /* The corresponding pop_obstacks is in finish_decl. */
5510 push_obstacks_nochange ();
5512 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5514 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5515 DECL_INITIAL (value
) = width
;
5517 maybe_objc_check_decl (value
);
5521 /* Function to help qsort sort FIELD_DECLs by name order. */
5524 field_decl_cmp (xp
, yp
)
5525 const GENERIC_PTR xp
;
5526 const GENERIC_PTR yp
;
5528 tree
*x
= (tree
*)xp
, *y
= (tree
*)yp
;
5530 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5532 if (DECL_NAME (*x
) == NULL
)
5534 if (DECL_NAME (*y
) == NULL
)
5536 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5541 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5542 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5543 ATTRIBUTES are attributes to be applied to the structure.
5545 We also do a pop_obstacks to match the push in start_struct. */
5548 finish_struct (t
, fieldlist
, attributes
)
5555 int toplevel
= global_binding_level
== current_binding_level
;
5557 /* If this type was previously laid out as a forward reference,
5558 make sure we lay it out again. */
5562 decl_attributes (t
, attributes
, NULL_TREE
);
5564 /* Nameless union parm types are useful as GCC extension. */
5565 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5566 /* Otherwise, warn about any struct or union def. in parmlist. */
5567 if (in_parm_level_p ())
5570 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5571 : "structure defined inside parms"));
5572 else if (! flag_traditional
)
5573 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5574 : "structure defined inside parms"));
5577 old_momentary
= suspend_momentary ();
5581 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5582 if (DECL_NAME (x
) != 0)
5586 pedwarn ("%s has no %smembers",
5587 (TREE_CODE (t
) == UNION_TYPE
? "union" : "structure"),
5588 (fieldlist
? "named " : ""));
5591 /* Install struct as DECL_CONTEXT of each field decl.
5592 Also process specified field sizes.
5593 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5594 The specified size is found in the DECL_INITIAL.
5595 Store 0 there, except for ": 0" fields (so we can find them
5596 and delete them, below). */
5598 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5600 DECL_CONTEXT (x
) = t
;
5601 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5602 DECL_FIELD_SIZE (x
) = 0;
5604 /* If any field is const, the structure type is pseudo-const. */
5605 if (TREE_READONLY (x
))
5606 C_TYPE_FIELDS_READONLY (t
) = 1;
5609 /* A field that is pseudo-const makes the structure likewise. */
5610 tree t1
= TREE_TYPE (x
);
5611 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5612 t1
= TREE_TYPE (t1
);
5613 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5614 && C_TYPE_FIELDS_READONLY (t1
))
5615 C_TYPE_FIELDS_READONLY (t
) = 1;
5618 /* Any field that is volatile means variables of this type must be
5619 treated in some ways as volatile. */
5620 if (TREE_THIS_VOLATILE (x
))
5621 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5623 /* Any field of nominal variable size implies structure is too. */
5624 if (C_DECL_VARIABLE_SIZE (x
))
5625 C_TYPE_VARIABLE_SIZE (t
) = 1;
5627 /* Detect invalid nested redefinition. */
5628 if (TREE_TYPE (x
) == t
)
5629 error ("nested redefinition of `%s'",
5630 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5632 /* Detect invalid bit-field size. */
5633 if (DECL_INITIAL (x
))
5634 STRIP_NOPS (DECL_INITIAL (x
));
5635 if (DECL_INITIAL (x
))
5637 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5638 constant_expression_warning (DECL_INITIAL (x
));
5641 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5642 DECL_INITIAL (x
) = NULL
;
5646 /* Detect invalid bit-field type. */
5647 if (DECL_INITIAL (x
)
5648 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5649 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5651 error_with_decl (x
, "bit-field `%s' has invalid type");
5652 DECL_INITIAL (x
) = NULL
;
5654 if (DECL_INITIAL (x
) && pedantic
5655 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5656 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5657 /* Accept an enum that's equivalent to int or unsigned int. */
5658 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5659 && (TYPE_PRECISION (TREE_TYPE (x
))
5660 == TYPE_PRECISION (integer_type_node
))))
5661 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5663 /* Detect and ignore out of range field width. */
5664 if (DECL_INITIAL (x
))
5666 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5668 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5670 DECL_INITIAL (x
) = NULL
;
5671 error_with_decl (x
, "negative width in bit-field `%s'");
5673 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5674 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5676 DECL_INITIAL (x
) = NULL
;
5677 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5679 else if (width
== 0 && DECL_NAME (x
) != 0)
5681 error_with_decl (x
, "zero width for bit-field `%s'");
5682 DECL_INITIAL (x
) = NULL
;
5686 /* Process valid field width. */
5687 if (DECL_INITIAL (x
))
5689 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5691 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5692 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5693 TREE_UNSIGNED (TREE_TYPE (x
)))
5694 || width
< min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5695 TREE_UNSIGNED (TREE_TYPE (x
)))))
5696 warning_with_decl (x
, "`%s' is narrower than values of its type");
5698 DECL_FIELD_SIZE (x
) = width
;
5699 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5700 DECL_INITIAL (x
) = NULL
;
5704 /* field size 0 => force desired amount of alignment. */
5705 #ifdef EMPTY_FIELD_BOUNDARY
5706 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5708 #ifdef PCC_BITFIELD_TYPE_MATTERS
5709 if (PCC_BITFIELD_TYPE_MATTERS
)
5710 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5711 TYPE_ALIGN (TREE_TYPE (x
)));
5715 else if (TREE_TYPE (x
) != error_mark_node
)
5717 int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5718 : TYPE_ALIGN (TREE_TYPE (x
)));
5719 /* Non-bit-fields are aligned for their type, except packed
5720 fields which require only BITS_PER_UNIT alignment. */
5721 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5725 /* Now DECL_INITIAL is null on all members. */
5727 /* Delete all duplicate fields from the fieldlist */
5728 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5729 /* Anonymous fields aren't duplicates. */
5730 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5734 register tree y
= fieldlist
;
5738 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5744 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5746 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5747 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5749 else x
= TREE_CHAIN (x
);
5752 /* Now we have the nearly final fieldlist. Record it,
5753 then lay out the structure or union (including the fields). */
5755 TYPE_FIELDS (t
) = fieldlist
;
5759 /* Delete all zero-width bit-fields from the front of the fieldlist */
5761 && DECL_INITIAL (fieldlist
))
5762 fieldlist
= TREE_CHAIN (fieldlist
);
5763 /* Delete all such members from the rest of the fieldlist */
5764 for (x
= fieldlist
; x
;)
5766 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5767 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5768 else x
= TREE_CHAIN (x
);
5771 /* Now we have the truly final field list.
5772 Store it in this type and in the variants. */
5774 TYPE_FIELDS (t
) = fieldlist
;
5776 /* If there are lots of fields, sort so we can look through them fast.
5777 We arbitrarily consider 16 or more elts to be "a lot". */
5781 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5792 len
+= list_length (x
);
5793 /* Use the same allocation policy here that make_node uses, to
5794 ensure that this lives as long as the rest of the struct decl.
5795 All decls in an inline function need to be saved. */
5796 if (allocation_temporary_p ())
5797 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5799 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5801 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5802 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5804 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5806 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5807 field_array
[len
++] = x
;
5809 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5813 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5815 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5816 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5817 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5820 /* If this was supposed to be a transparent union, but we can't
5821 make it one, warn and turn off the flag. */
5822 if (TREE_CODE (t
) == UNION_TYPE
5823 && TYPE_TRANSPARENT_UNION (t
)
5824 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5826 TYPE_TRANSPARENT_UNION (t
) = 0;
5827 warning ("union cannot be made transparent");
5830 /* If this structure or union completes the type of any previous
5831 variable declaration, lay it out and output its rtl. */
5833 if (current_binding_level
->n_incomplete
!= 0)
5836 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5838 if (TREE_TYPE (decl
) == t
5839 && TREE_CODE (decl
) != TYPE_DECL
)
5841 layout_decl (decl
, 0);
5842 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5843 maybe_objc_check_decl (decl
);
5844 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5847 --current_binding_level
->n_incomplete
;
5849 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5850 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5852 tree element
= TREE_TYPE (decl
);
5853 while (TREE_CODE (element
) == ARRAY_TYPE
)
5854 element
= TREE_TYPE (element
);
5856 layout_array_type (TREE_TYPE (decl
));
5861 resume_momentary (old_momentary
);
5863 /* Finish debugging output for this type. */
5864 rest_of_type_compilation (t
, toplevel
);
5866 /* The matching push is in start_struct. */
5872 /* Lay out the type T, and its element type, and so on. */
5875 layout_array_type (t
)
5878 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5879 layout_array_type (TREE_TYPE (t
));
5883 /* Begin compiling the definition of an enumeration type.
5884 NAME is its name (or null if anonymous).
5885 Returns the type object, as yet incomplete.
5886 Also records info about it so that build_enumerator
5887 may be used to declare the individual values as they are read. */
5893 register tree enumtype
= 0;
5895 /* If this is the real definition for a previous forward reference,
5896 fill in the contents in the same object that used to be the
5897 forward reference. */
5900 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5902 /* The corresponding pop_obstacks is in finish_enum. */
5903 push_obstacks_nochange ();
5904 /* If these symbols and types are global, make them permanent. */
5905 if (current_binding_level
== global_binding_level
)
5906 end_temporary_allocation ();
5908 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5910 enumtype
= make_node (ENUMERAL_TYPE
);
5911 pushtag (name
, enumtype
);
5914 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5916 if (TYPE_VALUES (enumtype
) != 0)
5918 /* This enum is a named one that has been declared already. */
5919 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5921 /* Completely replace its old definition.
5922 The old enumerators remain defined, however. */
5923 TYPE_VALUES (enumtype
) = 0;
5926 enum_next_value
= integer_zero_node
;
5929 if (flag_short_enums
)
5930 TYPE_PACKED (enumtype
) = 1;
5935 /* After processing and defining all the values of an enumeration type,
5936 install their decls in the enumeration type and finish it off.
5937 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5938 and ATTRIBUTES are the specified attributes.
5939 Returns ENUMTYPE. */
5942 finish_enum (enumtype
, values
, attributes
)
5947 register tree pair
, tem
;
5948 tree minnode
= 0, maxnode
= 0;
5949 int lowprec
, highprec
, precision
;
5950 int toplevel
= global_binding_level
== current_binding_level
;
5952 if (in_parm_level_p ())
5953 warning ("enum defined inside parms");
5955 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5957 /* Calculate the maximum value of any enumerator in this type. */
5959 if (values
== error_mark_node
)
5960 minnode
= maxnode
= integer_zero_node
;
5962 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5964 tree value
= TREE_VALUE (pair
);
5966 minnode
= maxnode
= TREE_VALUE (pair
);
5969 if (tree_int_cst_lt (maxnode
, value
))
5971 if (tree_int_cst_lt (value
, minnode
))
5976 TYPE_MIN_VALUE (enumtype
) = minnode
;
5977 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5979 /* An enum can have some negative values; then it is signed. */
5980 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
5982 /* Determine the precision this type needs. */
5984 lowprec
= min_precision (minnode
, TREE_UNSIGNED (enumtype
));
5985 highprec
= min_precision (maxnode
, TREE_UNSIGNED (enumtype
));
5986 precision
= MAX (lowprec
, highprec
);
5988 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5990 tree narrowest
= type_for_size (precision
, 1);
5993 warning ("enumeration values exceed range of largest integer");
5994 narrowest
= long_long_integer_type_node
;
5997 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (narrowest
);
6000 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
6002 TYPE_SIZE (enumtype
) = 0;
6003 layout_type (enumtype
);
6005 if (values
!= error_mark_node
)
6007 /* Change the type of the enumerators to be the enum type.
6008 Formerly this was done only for enums that fit in an int,
6009 but the comment said it was done only for enums wider than int.
6010 It seems necessary to do this for wide enums,
6011 and best not to change what's done for ordinary narrower ones. */
6012 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6014 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
6015 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
6016 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
6017 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
6020 /* Replace the decl nodes in VALUES with their names. */
6021 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6022 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
6024 TYPE_VALUES (enumtype
) = values
;
6027 /* Fix up all variant types of this enum type. */
6028 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
6030 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
6031 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
6032 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
6033 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
6034 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
6035 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
6036 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
6037 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
6040 /* Finish debugging output for this type. */
6041 rest_of_type_compilation (enumtype
, toplevel
);
6043 /* This matches a push in start_enum. */
6049 /* Build and install a CONST_DECL for one value of the
6050 current enumeration type (one that was begun with start_enum).
6051 Return a tree-list containing the CONST_DECL and its value.
6052 Assignment of sequential values by default is handled here. */
6055 build_enumerator (name
, value
)
6058 register tree decl
, type
;
6060 /* Validate and default VALUE. */
6062 /* Remove no-op casts from the value. */
6064 STRIP_TYPE_NOPS (value
);
6068 if (TREE_CODE (value
) == INTEGER_CST
)
6070 value
= default_conversion (value
);
6071 constant_expression_warning (value
);
6075 error ("enumerator value for `%s' not integer constant",
6076 IDENTIFIER_POINTER (name
));
6081 /* Default based on previous value. */
6082 /* It should no longer be possible to have NON_LVALUE_EXPR
6086 value
= enum_next_value
;
6088 error ("overflow in enumeration values");
6091 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
6093 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6094 value
= integer_zero_node
;
6097 /* Set basis for default for next value. */
6098 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6099 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6101 /* Now create a declaration for the enum value name. */
6103 type
= TREE_TYPE (value
);
6104 type
= type_for_size (MAX (TYPE_PRECISION (type
),
6105 TYPE_PRECISION (integer_type_node
)),
6107 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
6108 && TREE_UNSIGNED (type
)));
6110 decl
= build_decl (CONST_DECL
, name
, type
);
6111 DECL_INITIAL (decl
) = value
;
6112 TREE_TYPE (value
) = type
;
6115 return saveable_tree_cons (decl
, value
, NULL_TREE
);
6118 /* Create the FUNCTION_DECL for a function definition.
6119 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6120 the declaration; they describe the function's name and the type it returns,
6121 but twisted together in a fashion that parallels the syntax of C.
6123 This function creates a binding context for the function body
6124 as well as setting up the FUNCTION_DECL in current_function_decl.
6126 Returns 1 on success. If the DECLARATOR is not suitable for a function
6127 (it defines a datum instead), we return 0, which tells
6128 yyparse to report a parse error.
6130 NESTED is nonzero for a function nested within another function. */
6133 start_function (declspecs
, declarator
, prefix_attributes
, attributes
, nested
)
6134 tree declarator
, declspecs
, prefix_attributes
, attributes
;
6137 tree decl1
, old_decl
;
6139 int old_immediate_size_expand
= immediate_size_expand
;
6141 current_function_returns_value
= 0; /* Assume, until we see it does. */
6142 current_function_returns_null
= 0;
6143 warn_about_return_type
= 0;
6144 current_extern_inline
= 0;
6145 c_function_varargs
= 0;
6147 shadowed_labels
= 0;
6149 /* Don't expand any sizes in the return type of the function. */
6150 immediate_size_expand
= 0;
6152 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
6154 /* If the declarator is not suitable for a function definition,
6155 cause a syntax error. */
6159 decl_attributes (decl1
, prefix_attributes
, attributes
);
6161 announce_function (decl1
);
6163 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
6165 error ("return-type is an incomplete type");
6166 /* Make it return void instead. */
6168 = build_function_type (void_type_node
,
6169 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6172 if (warn_about_return_type
)
6173 warning ("return-type defaults to `int'");
6175 /* Save the parm names or decls from this function's declarator
6176 where store_parm_decls will find them. */
6177 current_function_parms
= last_function_parms
;
6178 current_function_parm_tags
= last_function_parm_tags
;
6180 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6181 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6182 DECL_INITIAL (decl1
) = error_mark_node
;
6184 /* If this definition isn't a prototype and we had a prototype declaration
6185 before, copy the arg type info from that prototype.
6186 But not if what we had before was a builtin function. */
6187 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6188 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6189 && !DECL_BUILT_IN (old_decl
)
6190 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6191 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6192 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6194 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6195 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6196 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6199 /* If there is no explicit declaration, look for any out-of-scope implicit
6202 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6204 /* Optionally warn of old-fashioned def with no previous prototype. */
6205 if (warn_strict_prototypes
6206 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6207 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
6208 warning ("function declaration isn't a prototype");
6209 /* Optionally warn of any global def with no previous prototype. */
6210 else if (warn_missing_prototypes
6211 && TREE_PUBLIC (decl1
)
6212 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
6213 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6214 warning_with_decl (decl1
, "no previous prototype for `%s'");
6215 /* Optionally warn of any def with no previous prototype
6216 if the function has already been used. */
6217 else if (warn_missing_prototypes
6218 && old_decl
!= 0 && TREE_USED (old_decl
)
6219 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6220 warning_with_decl (decl1
,
6221 "`%s' was used with no prototype before its definition");
6222 /* Optionally warn of any global def with no previous declaration. */
6223 else if (warn_missing_declarations
6224 && TREE_PUBLIC (decl1
)
6226 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6227 warning_with_decl (decl1
, "no previous declaration for `%s'");
6228 /* Optionally warn of any def with no previous declaration
6229 if the function has already been used. */
6230 else if (warn_missing_declarations
6231 && old_decl
!= 0 && TREE_USED (old_decl
)
6232 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6233 warning_with_decl (decl1
,
6234 "`%s' was used with no declaration before its definition");
6236 /* This is a definition, not a reference.
6237 So normally clear DECL_EXTERNAL.
6238 However, `extern inline' acts like a declaration
6239 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6240 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6242 /* This function exists in static storage.
6243 (This does not mean `static' in the C sense!) */
6244 TREE_STATIC (decl1
) = 1;
6246 /* A nested function is not global. */
6247 if (current_function_decl
!= 0)
6248 TREE_PUBLIC (decl1
) = 0;
6250 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6252 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
6257 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6258 != integer_type_node
)
6259 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
6261 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6262 args
= TREE_CHAIN (args
))
6264 tree type
= args
? TREE_VALUE (args
) : 0;
6266 if (type
== void_type_node
)
6273 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6274 pedwarn_with_decl (decl1
,
6275 "first argument of `%s' should be `int'");
6279 if (TREE_CODE (type
) != POINTER_TYPE
6280 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6281 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6283 pedwarn_with_decl (decl1
,
6284 "second argument of `%s' should be `char **'");
6288 if (TREE_CODE (type
) != POINTER_TYPE
6289 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6290 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6292 pedwarn_with_decl (decl1
,
6293 "third argument of `%s' should probably be `char **'");
6298 /* It is intentional that this message does not mention the third
6299 argument, which is warned for only pedantically, because it's
6300 blessed by mention in an appendix of the standard. */
6301 if (argct
> 0 && (argct
< 2 || argct
> 3))
6302 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
6304 if (argct
== 3 && pedantic
)
6305 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
6307 if (! TREE_PUBLIC (decl1
))
6308 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
6311 /* Record the decl so that the function name is defined.
6312 If we already have a decl for this name, and it is a FUNCTION_DECL,
6313 use the old decl. */
6315 current_function_decl
= pushdecl (decl1
);
6318 declare_parm_level (1);
6319 current_binding_level
->subblocks_tag_transparent
= 1;
6321 make_function_rtl (current_function_decl
);
6323 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6324 /* Promote the value to int before returning it. */
6325 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6327 /* It retains unsignedness if traditional
6328 or if not really getting wider. */
6329 if (TREE_UNSIGNED (restype
)
6330 && (flag_traditional
6331 || (TYPE_PRECISION (restype
)
6332 == TYPE_PRECISION (integer_type_node
))))
6333 restype
= unsigned_type_node
;
6335 restype
= integer_type_node
;
6337 DECL_RESULT (current_function_decl
)
6338 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6341 /* Allocate further tree nodes temporarily during compilation
6342 of this function only. */
6343 temporary_allocation ();
6345 /* If this fcn was already referenced via a block-scope `extern' decl
6346 (or an implicit decl), propagate certain information about the usage. */
6347 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6348 TREE_ADDRESSABLE (current_function_decl
) = 1;
6350 immediate_size_expand
= old_immediate_size_expand
;
6355 /* Record that this function is going to be a varargs function.
6356 This is called before store_parm_decls, which is too early
6357 to call mark_varargs directly. */
6362 c_function_varargs
= 1;
6365 /* Store the parameter declarations into the current function declaration.
6366 This is called after parsing the parameter declarations, before
6367 digesting the body of the function.
6369 For an old-style definition, modify the function's type
6370 to specify at least the number of arguments. */
6375 register tree fndecl
= current_function_decl
;
6378 /* This is either a chain of PARM_DECLs (if a prototype was used)
6379 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6380 tree specparms
= current_function_parms
;
6382 /* This is a list of types declared among parms in a prototype. */
6383 tree parmtags
= current_function_parm_tags
;
6385 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6386 register tree parmdecls
= getdecls ();
6388 /* This is a chain of any other decls that came in among the parm
6389 declarations. If a parm is declared with enum {foo, bar} x;
6390 then CONST_DECLs for foo and bar are put here. */
6393 /* Nonzero if this definition is written with a prototype. */
6396 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6398 /* This case is when the function was defined with an ANSI prototype.
6399 The parms already have decls, so we need not do anything here
6400 except record them as in effect
6401 and complain if any redundant old-style parm decls were written. */
6412 error_with_decl (fndecl
,
6413 "parm types given both in parmlist and separately");
6414 /* Get rid of the erroneous decls; don't keep them on
6415 the list of parms, since they might not be PARM_DECLs. */
6416 for (decl
= current_binding_level
->names
;
6417 decl
; decl
= TREE_CHAIN (decl
))
6418 if (DECL_NAME (decl
))
6419 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6420 for (link
= current_binding_level
->shadowed
;
6421 link
; link
= TREE_CHAIN (link
))
6422 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6423 current_binding_level
->names
= 0;
6424 current_binding_level
->shadowed
= 0;
6427 specparms
= nreverse (specparms
);
6428 for (parm
= specparms
; parm
; parm
= next
)
6430 next
= TREE_CHAIN (parm
);
6431 if (TREE_CODE (parm
) == PARM_DECL
)
6433 if (DECL_NAME (parm
) == 0)
6434 error_with_decl (parm
, "parameter name omitted");
6435 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6437 error_with_decl (parm
, "parameter `%s' declared void");
6438 /* Change the type to error_mark_node so this parameter
6439 will be ignored by assign_parms. */
6440 TREE_TYPE (parm
) = error_mark_node
;
6446 /* If we find an enum constant or a type tag,
6447 put it aside for the moment. */
6448 TREE_CHAIN (parm
) = 0;
6449 others
= chainon (others
, parm
);
6453 /* Get the decls in their original chain order
6454 and record in the function. */
6455 DECL_ARGUMENTS (fndecl
) = getdecls ();
6458 /* If this function takes a variable number of arguments,
6459 add a phony parameter to the end of the parm list,
6460 to represent the position of the first unnamed argument. */
6461 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6464 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6465 /* Let's hope the address of the unnamed parm
6466 won't depend on its type. */
6467 TREE_TYPE (dummy
) = integer_type_node
;
6468 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6469 DECL_ARGUMENTS (fndecl
)
6470 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6474 /* Now pushdecl the enum constants. */
6475 for (parm
= others
; parm
; parm
= next
)
6477 next
= TREE_CHAIN (parm
);
6478 if (DECL_NAME (parm
) == 0)
6480 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6482 else if (TREE_CODE (parm
) != PARM_DECL
)
6486 storetags (chainon (parmtags
, gettags ()));
6490 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6491 each with a parm name as the TREE_VALUE.
6493 PARMDECLS is a chain of declarations for parameters.
6494 Warning! It can also contain CONST_DECLs which are not parameters
6495 but are names of enumerators of any enum types
6496 declared among the parameters.
6498 First match each formal parameter name with its declaration.
6499 Associate decls with the names and store the decls
6500 into the TREE_PURPOSE slots. */
6502 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6503 DECL_RESULT (parm
) = 0;
6505 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6507 register tree tail
, found
= NULL
;
6509 if (TREE_VALUE (parm
) == 0)
6511 error_with_decl (fndecl
, "parameter name missing from parameter list");
6512 TREE_PURPOSE (parm
) = 0;
6516 /* See if any of the parmdecls specifies this parm by name.
6517 Ignore any enumerator decls. */
6518 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6519 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6520 && TREE_CODE (tail
) == PARM_DECL
)
6526 /* If declaration already marked, we have a duplicate name.
6527 Complain, and don't use this decl twice. */
6528 if (found
&& DECL_RESULT (found
) != 0)
6530 error_with_decl (found
, "multiple parameters named `%s'");
6534 /* If the declaration says "void", complain and ignore it. */
6535 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6537 error_with_decl (found
, "parameter `%s' declared void");
6538 TREE_TYPE (found
) = integer_type_node
;
6539 DECL_ARG_TYPE (found
) = integer_type_node
;
6540 layout_decl (found
, 0);
6543 /* Traditionally, a parm declared float is actually a double. */
6544 if (found
&& flag_traditional
6545 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6547 TREE_TYPE (found
) = double_type_node
;
6548 DECL_ARG_TYPE (found
) = double_type_node
;
6549 layout_decl (found
, 0);
6552 /* If no declaration found, default to int. */
6555 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6557 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6558 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6559 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6561 warning_with_decl (found
, "type of `%s' defaults to `int'");
6565 TREE_PURPOSE (parm
) = found
;
6567 /* Mark this decl as "already found" -- see test, above.
6568 It is safe to use DECL_RESULT for this
6569 since it is not used in PARM_DECLs or CONST_DECLs. */
6570 DECL_RESULT (found
) = error_mark_node
;
6573 /* Put anything which is on the parmdecls chain and which is
6574 not a PARM_DECL onto the list NONPARMS. (The types of
6575 non-parm things which might appear on the list include
6576 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6577 any actual PARM_DECLs not matched with any names. */
6580 for (parm
= parmdecls
; parm
; )
6582 tree next
= TREE_CHAIN (parm
);
6583 TREE_CHAIN (parm
) = 0;
6585 if (TREE_CODE (parm
) != PARM_DECL
)
6586 nonparms
= chainon (nonparms
, parm
);
6589 /* Complain about args with incomplete types. */
6590 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6592 error_with_decl (parm
, "parameter `%s' has incomplete type");
6593 TREE_TYPE (parm
) = error_mark_node
;
6596 if (DECL_RESULT (parm
) == 0)
6598 error_with_decl (parm
,
6599 "declaration for parameter `%s' but no such parameter");
6600 /* Pretend the parameter was not missing.
6601 This gets us to a standard state and minimizes
6602 further error messages. */
6604 = chainon (specparms
,
6605 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6612 /* Chain the declarations together in the order of the list of names. */
6613 /* Store that chain in the function decl, replacing the list of names. */
6615 DECL_ARGUMENTS (fndecl
) = 0;
6618 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6619 if (TREE_PURPOSE (parm
))
6622 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6624 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6625 last
= TREE_PURPOSE (parm
);
6626 TREE_CHAIN (last
) = 0;
6630 /* If there was a previous prototype,
6631 set the DECL_ARG_TYPE of each argument according to
6632 the type previously specified, and report any mismatches. */
6634 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6637 for (parm
= DECL_ARGUMENTS (fndecl
),
6638 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6639 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6640 != void_type_node
));
6641 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6643 if (parm
== 0 || type
== 0
6644 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6646 error ("number of arguments doesn't match prototype");
6647 error_with_file_and_line (current_function_prototype_file
,
6648 current_function_prototype_line
,
6649 "prototype declaration");
6652 /* Type for passing arg must be consistent
6653 with that declared for the arg. */
6654 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6656 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6657 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6659 /* Adjust argument to match prototype. E.g. a previous
6660 `int foo(float);' prototype causes
6661 `int foo(x) float x; {...}' to be treated like
6662 `int foo(float x) {...}'. This is particularly
6663 useful for argument types like uid_t. */
6664 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6665 #ifdef PROMOTE_PROTOTYPES
6666 if ((TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6667 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6668 && TYPE_PRECISION (TREE_TYPE (parm
))
6669 < TYPE_PRECISION (integer_type_node
))
6670 DECL_ARG_TYPE (parm
) = integer_type_node
;
6674 pedwarn ("promoted argument `%s' doesn't match prototype",
6675 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6676 warning_with_file_and_line
6677 (current_function_prototype_file
,
6678 current_function_prototype_line
,
6679 "prototype declaration");
6682 /* If -traditional, allow `int' argument to match
6683 `unsigned' prototype. */
6684 else if (! (flag_traditional
6685 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6686 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6688 error ("argument `%s' doesn't match prototype",
6689 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6690 error_with_file_and_line (current_function_prototype_file
,
6691 current_function_prototype_line
,
6692 "prototype declaration");
6696 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6699 /* Otherwise, create a prototype that would match. */
6703 tree actual
= 0, last
= 0, type
;
6705 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6707 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6710 TREE_CHAIN (last
) = type
;
6715 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6717 TREE_CHAIN (last
) = type
;
6721 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6722 of the type of this function, but we need to avoid having this
6723 affect the types of other similarly-typed functions, so we must
6724 first force the generation of an identical (but separate) type
6725 node for the relevant function type. The new node we create
6726 will be a variant of the main variant of the original function
6729 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6731 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6734 /* Now store the final chain of decls for the arguments
6735 as the decl-chain of the current lexical scope.
6736 Put the enumerators in as well, at the front so that
6737 DECL_ARGUMENTS is not modified. */
6739 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6742 /* Make sure the binding level for the top of the function body
6743 gets a BLOCK if there are any in the function.
6744 Otherwise, the dbx output is wrong. */
6746 keep_next_if_subblocks
= 1;
6748 /* ??? This might be an improvement,
6749 but needs to be thought about some more. */
6751 keep_next_level_flag
= 1;
6754 /* Write a record describing this function definition to the prototypes
6755 file (if requested). */
6757 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6759 /* Initialize the RTL code for the function. */
6761 init_function_start (fndecl
, input_filename
, lineno
);
6763 /* If this is a varargs function, inform function.c. */
6765 if (c_function_varargs
)
6768 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6770 declare_function_name ();
6772 /* Set up parameters and prepare for return, for the function. */
6774 expand_function_start (fndecl
, 0);
6776 /* If this function is `main', emit a call to `__main'
6777 to run global initializers, etc. */
6778 if (DECL_NAME (fndecl
)
6779 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6780 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6781 expand_main_function ();
6784 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6785 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6786 stands for an ellipsis in the identifier list.
6788 PARMLIST is the data returned by get_parm_info for the
6789 parmlist that follows the semicolon.
6791 We return a value of the same sort that get_parm_info returns,
6792 except that it describes the combination of identifiers and parmlist. */
6795 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6796 tree specparms
, parmlist
;
6799 register tree fndecl
= current_function_decl
;
6802 tree parmdecls
= TREE_PURPOSE (parmlist
);
6804 /* This is a chain of any other decls that came in among the parm
6805 declarations. They were separated already by get_parm_info,
6806 so we just need to keep them separate. */
6807 tree nonparms
= TREE_VALUE (parmlist
);
6811 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6812 DECL_RESULT (parm
) = 0;
6814 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6816 register tree tail
, found
= NULL
;
6818 /* See if any of the parmdecls specifies this parm by name. */
6819 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6820 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6826 /* If declaration already marked, we have a duplicate name.
6827 Complain, and don't use this decl twice. */
6828 if (found
&& DECL_RESULT (found
) != 0)
6830 error_with_decl (found
, "multiple parameters named `%s'");
6834 /* If the declaration says "void", complain and ignore it. */
6835 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6837 error_with_decl (found
, "parameter `%s' declared void");
6838 TREE_TYPE (found
) = integer_type_node
;
6839 DECL_ARG_TYPE (found
) = integer_type_node
;
6840 layout_decl (found
, 0);
6843 /* Traditionally, a parm declared float is actually a double. */
6844 if (found
&& flag_traditional
6845 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6847 TREE_TYPE (found
) = double_type_node
;
6848 DECL_ARG_TYPE (found
) = double_type_node
;
6849 layout_decl (found
, 0);
6852 /* If no declaration found, default to int. */
6855 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6857 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6858 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6859 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6860 error_with_decl (found
, "type of parameter `%s' is not declared");
6864 TREE_PURPOSE (parm
) = found
;
6866 /* Mark this decl as "already found" -- see test, above.
6867 It is safe to use DECL_RESULT for this
6868 since it is not used in PARM_DECLs or CONST_DECLs. */
6869 DECL_RESULT (found
) = error_mark_node
;
6872 /* Complain about any actual PARM_DECLs not matched with any names. */
6874 for (parm
= parmdecls
; parm
; )
6876 tree next
= TREE_CHAIN (parm
);
6877 TREE_CHAIN (parm
) = 0;
6879 /* Complain about args with incomplete types. */
6880 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6882 error_with_decl (parm
, "parameter `%s' has incomplete type");
6883 TREE_TYPE (parm
) = error_mark_node
;
6886 if (DECL_RESULT (parm
) == 0)
6888 error_with_decl (parm
,
6889 "declaration for parameter `%s' but no such parameter");
6890 /* Pretend the parameter was not missing.
6891 This gets us to a standard state and minimizes
6892 further error messages. */
6894 = chainon (specparms
,
6895 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6901 /* Chain the declarations together in the order of the list of names.
6902 At the same time, build up a list of their types, in reverse order. */
6908 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6909 if (TREE_PURPOSE (parm
))
6912 parmdecls
= TREE_PURPOSE (parm
);
6914 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6915 last
= TREE_PURPOSE (parm
);
6916 TREE_CHAIN (last
) = 0;
6918 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6923 return saveable_tree_cons (parmdecls
, nonparms
,
6924 nreverse (saveable_tree_cons (NULL_TREE
,
6928 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
6931 /* Finish up a function declaration and compile that function
6932 all the way to assembler language output. The free the storage
6933 for the function definition.
6935 This is called after parsing the body of the function definition.
6937 NESTED is nonzero if the function being finished is nested in another. */
6940 finish_function (nested
)
6943 register tree fndecl
= current_function_decl
;
6945 /* TREE_READONLY (fndecl) = 1;
6946 This caused &foo to be of type ptr-to-const-function
6947 which then got a warning when stored in a ptr-to-function variable. */
6950 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6952 /* Must mark the RESULT_DECL as being in this function. */
6954 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6956 /* Obey `register' declarations if `setjmp' is called in this fn. */
6957 if (flag_traditional
&& current_function_calls_setjmp
)
6959 setjmp_protect (DECL_INITIAL (fndecl
));
6960 setjmp_protect_args ();
6963 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6965 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6966 != integer_type_node
)
6968 /* You would expect the sense of this test to be the other way
6969 around, but if warn_main is set, we will already have warned,
6970 so this would be a duplicate. This is the warning you get
6971 in some environments even if you *don't* ask for it, because
6972 these are environments where it may be more of a problem than
6975 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6979 #ifdef DEFAULT_MAIN_RETURN
6980 /* Make it so that `main' always returns success by default. */
6981 DEFAULT_MAIN_RETURN
;
6986 /* Generate rtl for function exit. */
6987 expand_function_end (input_filename
, lineno
, 0);
6989 /* So we can tell if jump_optimize sets it to 1. */
6992 /* Run the optimizers and output the assembler code for this function. */
6993 rest_of_compilation (fndecl
);
6995 current_function_returns_null
|= can_reach_end
;
6997 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6998 warning ("`noreturn' function does return");
6999 else if (warn_return_type
&& can_reach_end
7000 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
7001 /* If this function returns non-void and control can drop through,
7003 warning ("control reaches end of non-void function");
7004 /* With just -W, complain only if function returns both with
7005 and without a value. */
7006 else if (extra_warnings
7007 && current_function_returns_value
&& current_function_returns_null
)
7008 warning ("this function may return with or without a value");
7010 /* If requested, warn about function definitions where the function will
7011 return a value (usually of some struct or union type) which itself will
7012 take up a lot of stack space. */
7014 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
7016 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
7020 register tree ret_type_size
= TYPE_SIZE (ret_type
);
7022 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
7025 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
7027 if (units
> larger_than_size
)
7028 warning_with_decl (fndecl
,
7029 "size of return value of `%s' is %u bytes",
7035 /* Free all the tree nodes making up this function. */
7036 /* Switch back to allocating nodes permanently
7037 until we start another function. */
7039 permanent_allocation (1);
7041 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
7043 /* Stop pointing to the local nodes about to be freed. */
7044 /* But DECL_INITIAL must remain nonzero so we know this
7045 was an actual function definition. */
7046 /* For a nested function, this is done in pop_c_function_context. */
7047 /* If rest_of_compilation set this to 0, leave it 0. */
7048 if (DECL_INITIAL (fndecl
) != 0)
7049 DECL_INITIAL (fndecl
) = error_mark_node
;
7050 DECL_ARGUMENTS (fndecl
) = 0;
7053 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
7055 #ifndef ASM_OUTPUT_CONSTRUCTOR
7056 if (! flag_gnu_linker
)
7057 static_ctors
= perm_tree_cons (NULL_TREE
, fndecl
, static_ctors
);
7060 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7062 if (DECL_STATIC_DESTRUCTOR (fndecl
))
7064 #ifndef ASM_OUTPUT_DESTRUCTOR
7065 if (! flag_gnu_linker
)
7066 static_dtors
= perm_tree_cons (NULL_TREE
, fndecl
, static_dtors
);
7069 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7074 /* Let the error reporting routines know that we're outside a
7075 function. For a nested function, this value is used in
7076 pop_c_function_context and then reset via pop_function_context. */
7077 current_function_decl
= NULL
;
7081 /* Save and restore the variables in this file and elsewhere
7082 that keep track of the progress of compilation of the current function.
7083 Used for nested functions. */
7087 struct c_function
*next
;
7089 tree shadowed_labels
;
7092 int warn_about_return_type
;
7094 struct binding_level
*binding_level
;
7097 struct c_function
*c_function_chain
;
7099 /* Save and reinitialize the variables
7100 used during compilation of a C function. */
7103 push_c_function_context ()
7105 struct c_function
*p
7106 = (struct c_function
*) xmalloc (sizeof (struct c_function
));
7109 pedwarn ("ANSI C forbids nested functions");
7111 push_function_context ();
7113 p
->next
= c_function_chain
;
7114 c_function_chain
= p
;
7116 p
->named_labels
= named_labels
;
7117 p
->shadowed_labels
= shadowed_labels
;
7118 p
->returns_value
= current_function_returns_value
;
7119 p
->returns_null
= current_function_returns_null
;
7120 p
->warn_about_return_type
= warn_about_return_type
;
7121 p
->extern_inline
= current_extern_inline
;
7122 p
->binding_level
= current_binding_level
;
7125 /* Restore the variables used during compilation of a C function. */
7128 pop_c_function_context ()
7130 struct c_function
*p
= c_function_chain
;
7133 /* Bring back all the labels that were shadowed. */
7134 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7135 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7136 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7137 = TREE_VALUE (link
);
7139 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
7141 /* Stop pointing to the local nodes about to be freed. */
7142 /* But DECL_INITIAL must remain nonzero so we know this
7143 was an actual function definition. */
7144 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7145 DECL_ARGUMENTS (current_function_decl
) = 0;
7148 pop_function_context ();
7150 c_function_chain
= p
->next
;
7152 named_labels
= p
->named_labels
;
7153 shadowed_labels
= p
->shadowed_labels
;
7154 current_function_returns_value
= p
->returns_value
;
7155 current_function_returns_null
= p
->returns_null
;
7156 warn_about_return_type
= p
->warn_about_return_type
;
7157 current_extern_inline
= p
->extern_inline
;
7158 current_binding_level
= p
->binding_level
;
7163 /* integrate_decl_tree calls this function, but since we don't use the
7164 DECL_LANG_SPECIFIC field, this is a no-op. */
7167 copy_lang_decl (node
)