1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
36 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
38 { NORMAL
, /* Ordinary declaration */
39 FUNCDEF
, /* Function definition */
40 PARM
, /* Declaration of parm before function body */
41 FIELD
, /* Declaration inside struct or union */
42 BITFIELD
, /* Likewise but with specified width */
43 TYPENAME
}; /* Typename (inside cast or sizeof) */
45 #ifndef CHAR_TYPE_SIZE
46 #define CHAR_TYPE_SIZE BITS_PER_UNIT
49 #ifndef SHORT_TYPE_SIZE
50 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
54 #define INT_TYPE_SIZE BITS_PER_WORD
57 #ifndef LONG_TYPE_SIZE
58 #define LONG_TYPE_SIZE BITS_PER_WORD
61 #ifndef LONG_LONG_TYPE_SIZE
62 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
65 #ifndef WCHAR_UNSIGNED
66 #define WCHAR_UNSIGNED 0
69 #ifndef FLOAT_TYPE_SIZE
70 #define FLOAT_TYPE_SIZE BITS_PER_WORD
73 #ifndef DOUBLE_TYPE_SIZE
74 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
77 #ifndef LONG_DOUBLE_TYPE_SIZE
78 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
81 /* We let tm.h override the types used here, to handle trivial differences
82 such as the choice of unsigned int or long unsigned int for size_t.
83 When machines start needing nontrivial differences in the size type,
84 it would be best to do something here to figure out automatically
85 from other information what type to use. */
88 #define SIZE_TYPE "long unsigned int"
92 #define PTRDIFF_TYPE "long int"
96 #define WCHAR_TYPE "int"
99 /* a node which has tree code ERROR_MARK, and whose type is itself.
100 All erroneous expressions are replaced with this node. All functions
101 that accept nodes as arguments should avoid generating error messages
102 if this node is one of the arguments, since it is undesirable to get
103 multiple error messages from one error in the input. */
105 tree error_mark_node
;
107 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
109 tree short_integer_type_node
;
110 tree integer_type_node
;
111 tree long_integer_type_node
;
112 tree long_long_integer_type_node
;
114 tree short_unsigned_type_node
;
115 tree unsigned_type_node
;
116 tree long_unsigned_type_node
;
117 tree long_long_unsigned_type_node
;
119 tree boolean_type_node
;
120 tree boolean_false_node
;
121 tree boolean_true_node
;
123 tree ptrdiff_type_node
;
125 tree unsigned_char_type_node
;
126 tree signed_char_type_node
;
128 tree wchar_type_node
;
129 tree signed_wchar_type_node
;
130 tree unsigned_wchar_type_node
;
132 tree float_type_node
;
133 tree double_type_node
;
134 tree long_double_type_node
;
136 tree complex_integer_type_node
;
137 tree complex_float_type_node
;
138 tree complex_double_type_node
;
139 tree complex_long_double_type_node
;
141 tree intQI_type_node
;
142 tree intHI_type_node
;
143 tree intSI_type_node
;
144 tree intDI_type_node
;
146 tree unsigned_intQI_type_node
;
147 tree unsigned_intHI_type_node
;
148 tree unsigned_intSI_type_node
;
149 tree unsigned_intDI_type_node
;
151 /* a VOID_TYPE node. */
155 /* Nodes for types `void *' and `const void *'. */
157 tree ptr_type_node
, const_ptr_type_node
;
159 /* Nodes for types `char *' and `const char *'. */
161 tree string_type_node
, const_string_type_node
;
163 /* Type `char[SOMENUMBER]'.
164 Used when an array of char is needed and the size is irrelevant. */
166 tree char_array_type_node
;
168 /* Type `int[SOMENUMBER]' or something like it.
169 Used when an array of int needed and the size is irrelevant. */
171 tree int_array_type_node
;
173 /* Type `wchar_t[SOMENUMBER]' or something like it.
174 Used when a wide string literal is created. */
176 tree wchar_array_type_node
;
178 /* type `int ()' -- used for implicit declaration of functions. */
180 tree default_function_type
;
182 /* function types `double (double)' and `double (double, double)', etc. */
184 tree double_ftype_double
, double_ftype_double_double
;
185 tree int_ftype_int
, long_ftype_long
;
186 tree float_ftype_float
;
187 tree ldouble_ftype_ldouble
;
189 /* Function type `void (void *, void *, int)' and similar ones */
191 tree void_ftype_ptr_ptr_int
, int_ftype_ptr_ptr_int
, void_ftype_ptr_int_int
;
193 /* Function type `char *(char *, char *)' and similar ones */
194 tree string_ftype_ptr_ptr
, int_ftype_string_string
;
196 /* Function type `int (const void *, const void *, size_t)' */
197 tree int_ftype_cptr_cptr_sizet
;
199 /* Two expressions that are constants with value zero.
200 The first is of type `int', the second of type `void *'. */
202 tree integer_zero_node
;
203 tree null_pointer_node
;
205 /* A node for the integer constant 1. */
207 tree integer_one_node
;
209 /* Nonzero if we have seen an invalid cross reference
210 to a struct, union, or enum, but not yet printed the message. */
212 tree pending_invalid_xref
;
213 /* File and line to appear in the eventual error message. */
214 char *pending_invalid_xref_file
;
215 int pending_invalid_xref_line
;
217 /* While defining an enum type, this is 1 plus the last enumerator
218 constant value. Note that will do not have to save this or `enum_overflow'
219 around nested function definition since such a definition could only
220 occur in an enum value expression and we don't use these variables in
223 static tree enum_next_value
;
225 /* Nonzero means that there was overflow computing enum_next_value. */
227 static int enum_overflow
;
229 /* Parsing a function declarator leaves a list of parameter names
230 or a chain or parameter decls here. */
232 static tree last_function_parms
;
234 /* Parsing a function declarator leaves here a chain of structure
235 and enum types declared in the parmlist. */
237 static tree last_function_parm_tags
;
239 /* After parsing the declarator that starts a function definition,
240 `start_function' puts here the list of parameter names or chain of decls.
241 `store_parm_decls' finds it here. */
243 static tree current_function_parms
;
245 /* Similar, for last_function_parm_tags. */
246 static tree current_function_parm_tags
;
248 /* Similar, for the file and line that the prototype came from if this is
249 an old-style definition. */
250 static char *current_function_prototype_file
;
251 static int current_function_prototype_line
;
253 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
254 that have names. Here so we can clear out their names' definitions
255 at the end of the function. */
257 static tree named_labels
;
259 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
261 static tree shadowed_labels
;
263 /* Nonzero when store_parm_decls is called indicates a varargs function.
264 Value not meaningful after store_parm_decls. */
266 static int c_function_varargs
;
268 /* The FUNCTION_DECL for the function currently being compiled,
269 or 0 if between functions. */
270 tree current_function_decl
;
272 /* Set to 0 at beginning of a function definition, set to 1 if
273 a return statement that specifies a return value is seen. */
275 int current_function_returns_value
;
277 /* Set to 0 at beginning of a function definition, set to 1 if
278 a return statement with no argument is seen. */
280 int current_function_returns_null
;
282 /* Set to nonzero by `grokdeclarator' for a function
283 whose return type is defaulted, if warnings for this are desired. */
285 static int warn_about_return_type
;
287 /* Nonzero when starting a function declared `extern inline'. */
289 static int current_extern_inline
;
291 /* For each binding contour we allocate a binding_level structure
292 * which records the names defined in that contour.
295 * 1) one for each function definition,
296 * where internal declarations of the parameters appear.
297 * 2) one for each compound statement,
298 * to record its declarations.
300 * The current meaning of a name can be found by searching the levels from
301 * the current one out to the global one.
304 /* Note that the information in the `names' component of the global contour
305 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
309 /* A chain of _DECL nodes for all variables, constants, functions,
310 and typedef types. These are in the reverse of the order supplied.
314 /* A list of structure, union and enum definitions,
315 * for looking up tag names.
316 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
317 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
318 * or ENUMERAL_TYPE node.
322 /* For each level, a list of shadowed outer-level local definitions
323 to be restored when this level is popped.
324 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
325 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
328 /* For each level (except not the global one),
329 a chain of BLOCK nodes for all the levels
330 that were entered and exited one level down. */
333 /* The BLOCK node for this level, if one has been preallocated.
334 If 0, the BLOCK is allocated (if needed) when the level is popped. */
337 /* The binding level which this one is contained in (inherits from). */
338 struct binding_level
*level_chain
;
340 /* Nonzero for the level that holds the parameters of a function. */
343 /* Nonzero if this level "doesn't exist" for tags. */
344 char tag_transparent
;
346 /* Nonzero if sublevels of this level "don't exist" for tags.
347 This is set in the parm level of a function definition
348 while reading the function body, so that the outermost block
349 of the function body will be tag-transparent. */
350 char subblocks_tag_transparent
;
352 /* Nonzero means make a BLOCK for this level regardless of all else. */
355 /* Nonzero means make a BLOCK if this level has any subblocks. */
356 char keep_if_subblocks
;
358 /* Number of decls in `names' that have incomplete
359 structure or union types. */
362 /* A list of decls giving the (reversed) specified order of parms,
363 not including any forward-decls in the parmlist.
364 This is so we can put the parms in proper order for assign_parms. */
368 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
370 /* The binding level currently in effect. */
372 static struct binding_level
*current_binding_level
;
374 /* A chain of binding_level structures awaiting reuse. */
376 static struct binding_level
*free_binding_level
;
378 /* The outermost binding level, for names of file scope.
379 This is created when the compiler is started and exists
380 through the entire run. */
382 static struct binding_level
*global_binding_level
;
384 /* Binding level structures are initialized by copying this one. */
386 static struct binding_level clear_binding_level
387 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
390 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
392 static int keep_next_level_flag
;
394 /* Nonzero means make a BLOCK for the next level pushed
395 if it has subblocks. */
397 static int keep_next_if_subblocks
;
399 /* The chain of outer levels of label scopes.
400 This uses the same data structure used for binding levels,
401 but it works differently: each link in the chain records
402 saved values of named_labels and shadowed_labels for
403 a label binding level outside the current one. */
405 static struct binding_level
*label_level_chain
;
407 /* Functions called automatically at the beginning and end of execution. */
409 tree static_ctors
, static_dtors
;
411 /* Forward declarations. */
413 static tree
grokparms (), grokdeclarator ();
415 tree
builtin_function ();
416 void shadow_tag_warned ();
418 static tree
lookup_tag ();
419 static tree
lookup_tag_reverse ();
420 tree
lookup_name_current_level ();
421 static char *redeclaration_error_message ();
422 static void layout_array_type ();
424 /* C-specific option variables. */
426 /* Nonzero means allow type mismatches in conditional expressions;
427 just make their values `void'. */
429 int flag_cond_mismatch
;
431 /* Nonzero means give `double' the same size as `float'. */
433 int flag_short_double
;
435 /* Nonzero means don't recognize the keyword `asm'. */
439 /* Nonzero means don't recognize any builtin functions. */
443 /* Nonzero means don't recognize the non-ANSI builtin functions.
446 int flag_no_nonansi_builtin
;
448 /* Nonzero means do some things the same way PCC does. */
450 int flag_traditional
;
452 /* Nonzero means to allow single precision math even if we're generally
453 being traditional. */
454 int flag_allow_single_precision
= 0;
456 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
458 int flag_signed_bitfields
= 1;
459 int explicit_flag_signed_bitfields
= 0;
461 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
463 int flag_no_ident
= 0;
465 /* Nonzero means warn about implicit declarations. */
469 /* Nonzero means give string constants the type `const char *'
470 to get extra warnings from them. These warnings will be too numerous
471 to be useful, except in thoroughly ANSIfied programs. */
473 int warn_write_strings
;
475 /* Nonzero means warn about pointer casts that can drop a type qualifier
476 from the pointer target type. */
480 /* Nonzero means warn when casting a function call to a type that does
481 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
482 when there is no previous declaration of sqrt or malloc. */
484 int warn_bad_function_cast
;
486 /* Warn about traditional constructs whose meanings changed in ANSI C. */
488 int warn_traditional
;
490 /* Nonzero means warn about sizeof(function) or addition/subtraction
491 of function pointers. */
493 int warn_pointer_arith
;
495 /* Nonzero means warn for non-prototype function decls
496 or non-prototyped defs without previous prototype. */
498 int warn_strict_prototypes
;
500 /* Nonzero means warn for any global function def
501 without separate previous prototype decl. */
503 int warn_missing_prototypes
;
505 /* Nonzero means warn for any global function def
506 without separate previous decl. */
508 int warn_missing_declarations
;
510 /* Nonzero means warn about multiple (redundant) decls for the same single
511 variable or function. */
513 int warn_redundant_decls
= 0;
515 /* Nonzero means warn about extern declarations of objects not at
516 file-scope level and about *all* declarations of functions (whether
517 extern or static) not at file-scope level. Note that we exclude
518 implicit function declarations. To get warnings about those, use
521 int warn_nested_externs
= 0;
523 /* Warn about *printf or *scanf format/argument anomalies. */
527 /* Warn about a subscript that has type char. */
529 int warn_char_subscripts
= 0;
531 /* Warn if a type conversion is done that might have confusing results. */
535 /* Warn if adding () is suggested. */
537 int warn_parentheses
;
539 /* Warn if initializer is not completely bracketed. */
541 int warn_missing_braces
;
543 /* Nonzero means `$' can be in an identifier.
544 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
546 #ifndef DOLLARS_IN_IDENTIFIERS
547 #define DOLLARS_IN_IDENTIFIERS 1
549 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
551 /* Decode the string P as a language-specific option for C.
552 Return 1 if it is recognized (and handle it);
553 return 0 if not recognized. */
559 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
561 flag_traditional
= 1;
562 flag_writable_strings
= 1;
563 #if DOLLARS_IN_IDENTIFIERS > 0
564 dollars_in_ident
= 1;
567 else if (!strcmp (p
, "-fallow-single-precision"))
568 flag_allow_single_precision
= 1;
569 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
571 flag_traditional
= 0;
572 flag_writable_strings
= 0;
573 dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
575 else if (!strcmp (p
, "-fdollars-in-identifiers"))
577 #if DOLLARS_IN_IDENTIFIERS > 0
578 dollars_in_ident
= 1;
581 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
582 dollars_in_ident
= 0;
583 else if (!strcmp (p
, "-fsigned-char"))
584 flag_signed_char
= 1;
585 else if (!strcmp (p
, "-funsigned-char"))
586 flag_signed_char
= 0;
587 else if (!strcmp (p
, "-fno-signed-char"))
588 flag_signed_char
= 0;
589 else if (!strcmp (p
, "-fno-unsigned-char"))
590 flag_signed_char
= 1;
591 else if (!strcmp (p
, "-fsigned-bitfields")
592 || !strcmp (p
, "-fno-unsigned-bitfields"))
594 flag_signed_bitfields
= 1;
595 explicit_flag_signed_bitfields
= 1;
597 else if (!strcmp (p
, "-funsigned-bitfields")
598 || !strcmp (p
, "-fno-signed-bitfields"))
600 flag_signed_bitfields
= 0;
601 explicit_flag_signed_bitfields
= 1;
603 else if (!strcmp (p
, "-fshort-enums"))
604 flag_short_enums
= 1;
605 else if (!strcmp (p
, "-fno-short-enums"))
606 flag_short_enums
= 0;
607 else if (!strcmp (p
, "-fcond-mismatch"))
608 flag_cond_mismatch
= 1;
609 else if (!strcmp (p
, "-fno-cond-mismatch"))
610 flag_cond_mismatch
= 0;
611 else if (!strcmp (p
, "-fshort-double"))
612 flag_short_double
= 1;
613 else if (!strcmp (p
, "-fno-short-double"))
614 flag_short_double
= 0;
615 else if (!strcmp (p
, "-fasm"))
617 else if (!strcmp (p
, "-fno-asm"))
619 else if (!strcmp (p
, "-fbuiltin"))
621 else if (!strcmp (p
, "-fno-builtin"))
623 else if (!strcmp (p
, "-fno-ident"))
625 else if (!strcmp (p
, "-fident"))
627 else if (!strcmp (p
, "-ansi"))
628 flag_no_asm
= 1, flag_no_nonansi_builtin
= 1, dollars_in_ident
= 0;
629 else if (!strcmp (p
, "-Wimplicit"))
631 else if (!strcmp (p
, "-Wno-implicit"))
633 else if (!strcmp (p
, "-Wwrite-strings"))
634 warn_write_strings
= 1;
635 else if (!strcmp (p
, "-Wno-write-strings"))
636 warn_write_strings
= 0;
637 else if (!strcmp (p
, "-Wcast-qual"))
639 else if (!strcmp (p
, "-Wno-cast-qual"))
641 else if (!strcmp (p
, "-Wbad-function-cast"))
642 warn_bad_function_cast
= 1;
643 else if (!strcmp (p
, "-Wno-bad-function-cast"))
644 warn_bad_function_cast
= 0;
645 else if (!strcmp (p
, "-Wpointer-arith"))
646 warn_pointer_arith
= 1;
647 else if (!strcmp (p
, "-Wno-pointer-arith"))
648 warn_pointer_arith
= 0;
649 else if (!strcmp (p
, "-Wstrict-prototypes"))
650 warn_strict_prototypes
= 1;
651 else if (!strcmp (p
, "-Wno-strict-prototypes"))
652 warn_strict_prototypes
= 0;
653 else if (!strcmp (p
, "-Wmissing-prototypes"))
654 warn_missing_prototypes
= 1;
655 else if (!strcmp (p
, "-Wno-missing-prototypes"))
656 warn_missing_prototypes
= 0;
657 else if (!strcmp (p
, "-Wmissing-declarations"))
658 warn_missing_declarations
= 1;
659 else if (!strcmp (p
, "-Wno-missing-declarations"))
660 warn_missing_declarations
= 0;
661 else if (!strcmp (p
, "-Wredundant-decls"))
662 warn_redundant_decls
= 1;
663 else if (!strcmp (p
, "-Wno-redundant-decls"))
664 warn_redundant_decls
= 0;
665 else if (!strcmp (p
, "-Wnested-externs"))
666 warn_nested_externs
= 1;
667 else if (!strcmp (p
, "-Wno-nested-externs"))
668 warn_nested_externs
= 0;
669 else if (!strcmp (p
, "-Wtraditional"))
670 warn_traditional
= 1;
671 else if (!strcmp (p
, "-Wno-traditional"))
672 warn_traditional
= 0;
673 else if (!strcmp (p
, "-Wformat"))
675 else if (!strcmp (p
, "-Wno-format"))
677 else if (!strcmp (p
, "-Wchar-subscripts"))
678 warn_char_subscripts
= 1;
679 else if (!strcmp (p
, "-Wno-char-subscripts"))
680 warn_char_subscripts
= 0;
681 else if (!strcmp (p
, "-Wconversion"))
683 else if (!strcmp (p
, "-Wno-conversion"))
685 else if (!strcmp (p
, "-Wparentheses"))
686 warn_parentheses
= 1;
687 else if (!strcmp (p
, "-Wno-parentheses"))
688 warn_parentheses
= 0;
689 else if (!strcmp (p
, "-Wreturn-type"))
690 warn_return_type
= 1;
691 else if (!strcmp (p
, "-Wno-return-type"))
692 warn_return_type
= 0;
693 else if (!strcmp (p
, "-Wcomment"))
694 ; /* cpp handles this one. */
695 else if (!strcmp (p
, "-Wno-comment"))
696 ; /* cpp handles this one. */
697 else if (!strcmp (p
, "-Wcomments"))
698 ; /* cpp handles this one. */
699 else if (!strcmp (p
, "-Wno-comments"))
700 ; /* cpp handles this one. */
701 else if (!strcmp (p
, "-Wtrigraphs"))
702 ; /* cpp handles this one. */
703 else if (!strcmp (p
, "-Wno-trigraphs"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p
, "-Wimport"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p
, "-Wno-import"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p
, "-Wmissing-braces"))
710 warn_missing_braces
= 1;
711 else if (!strcmp (p
, "-Wno-missing-braces"))
712 warn_missing_braces
= 0;
713 else if (!strcmp (p
, "-Wall"))
716 /* We save the value of warn_uninitialized, since if they put
717 -Wuninitialized on the command line, we need to generate a
718 warning about not using it without also specifying -O. */
719 if (warn_uninitialized
!= 1)
720 warn_uninitialized
= 2;
722 warn_return_type
= 1;
726 warn_char_subscripts
= 1;
727 warn_parentheses
= 1;
728 warn_missing_braces
= 1;
736 /* Hooks for print_node. */
739 print_lang_decl (file
, node
, indent
)
747 print_lang_type (file
, node
, indent
)
755 print_lang_identifier (file
, node
, indent
)
760 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
761 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
762 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
763 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
764 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
765 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
768 /* Hook called at end of compilation to assume 1 elt
769 for a top-level array decl that wasn't complete before. */
772 finish_incomplete_decl (decl
)
775 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_TYPE (decl
) != error_mark_node
)
777 tree type
= TREE_TYPE (decl
);
778 if (TREE_CODE (type
) == ARRAY_TYPE
779 && TYPE_DOMAIN (type
) == 0
780 && TREE_CODE (decl
) != TYPE_DECL
)
782 complete_array_type (type
, NULL_TREE
, 1);
784 layout_decl (decl
, 0);
789 /* Create a new `struct binding_level'. */
792 struct binding_level
*
793 make_binding_level ()
796 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
799 /* Nonzero if we are currently in the global binding level. */
804 return current_binding_level
== global_binding_level
;
810 keep_next_level_flag
= 1;
813 /* Nonzero if the current level needs to have a BLOCK made. */
818 return ((current_binding_level
->keep_if_subblocks
819 && current_binding_level
->blocks
!= 0)
820 || current_binding_level
->keep
821 || current_binding_level
->names
!= 0
822 || (current_binding_level
->tags
!= 0
823 && !current_binding_level
->tag_transparent
));
826 /* Identify this binding level as a level of parameters.
827 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
828 But it turns out there is no way to pass the right value for
829 DEFINITION_FLAG, so we ignore it. */
832 declare_parm_level (definition_flag
)
835 current_binding_level
->parm_flag
= 1;
838 /* Nonzero if currently making parm declarations. */
843 return current_binding_level
->parm_flag
;
846 /* Enter a new binding level.
847 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
848 not for that of tags. */
851 pushlevel (tag_transparent
)
854 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
856 /* If this is the top level of a function,
857 just make sure that NAMED_LABELS is 0. */
859 if (current_binding_level
== global_binding_level
)
864 /* Reuse or create a struct for this binding level. */
866 if (free_binding_level
)
868 newlevel
= free_binding_level
;
869 free_binding_level
= free_binding_level
->level_chain
;
873 newlevel
= make_binding_level ();
876 /* Add this level to the front of the chain (stack) of levels that
879 *newlevel
= clear_binding_level
;
880 newlevel
->tag_transparent
882 || (current_binding_level
883 ? current_binding_level
->subblocks_tag_transparent
885 newlevel
->level_chain
= current_binding_level
;
886 current_binding_level
= newlevel
;
887 newlevel
->keep
= keep_next_level_flag
;
888 keep_next_level_flag
= 0;
889 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
890 keep_next_if_subblocks
= 0;
893 /* Exit a binding level.
894 Pop the level off, and restore the state of the identifier-decl mappings
895 that were in effect when this level was entered.
897 If KEEP is nonzero, this level had explicit declarations, so
898 and create a "block" (a BLOCK node) for the level
899 to record its declarations and subblocks for symbol table output.
901 If FUNCTIONBODY is nonzero, this level is the body of a function,
902 so create a block as if KEEP were set and also clear out all
905 If REVERSE is nonzero, reverse the order of decls before putting
906 them into the BLOCK. */
909 poplevel (keep
, reverse
, functionbody
)
915 /* The chain of decls was accumulated in reverse order.
916 Put it into forward order, just for cleanliness. */
918 tree tags
= current_binding_level
->tags
;
919 tree subblocks
= current_binding_level
->blocks
;
922 int block_previously_created
;
924 keep
|= current_binding_level
->keep
;
926 /* This warning is turned off because it causes warnings for
927 declarations like `extern struct foo *x'. */
929 /* Warn about incomplete structure types in this level. */
930 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
931 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
933 tree type
= TREE_VALUE (link
);
935 switch (TREE_CODE (type
))
938 errmsg
= "`struct %s' incomplete in scope ending here";
941 errmsg
= "`union %s' incomplete in scope ending here";
944 errmsg
= "`enum %s' incomplete in scope ending here";
947 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
948 error (errmsg
, IDENTIFIER_POINTER (TYPE_NAME (type
)));
950 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
951 error (errmsg
, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
))));
955 /* Get the decls in the order they were written.
956 Usually current_binding_level->names is in reverse order.
957 But parameter decls were previously put in forward order. */
960 current_binding_level
->names
961 = decls
= nreverse (current_binding_level
->names
);
963 decls
= current_binding_level
->names
;
965 /* Output any nested inline functions within this block
966 if they weren't already output. */
968 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
969 if (TREE_CODE (decl
) == FUNCTION_DECL
970 && ! TREE_ASM_WRITTEN (decl
)
971 && DECL_INITIAL (decl
) != 0
972 && TREE_ADDRESSABLE (decl
))
974 /* If this decl was copied from a file-scope decl
975 on account of a block-scope extern decl,
976 propagate TREE_ADDRESSABLE to the file-scope decl.
978 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
979 true, since then the decl goes through save_for_inline_copying. */
980 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
981 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
982 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
985 push_function_context ();
986 output_inline_function (decl
);
987 pop_function_context ();
991 /* If there were any declarations or structure tags in that level,
992 or if this level is a function body,
993 create a BLOCK to record them for the life of this function. */
996 block_previously_created
= (current_binding_level
->this_block
!= 0);
997 if (block_previously_created
)
998 block
= current_binding_level
->this_block
;
999 else if (keep
|| functionbody
1000 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1001 block
= make_node (BLOCK
);
1004 BLOCK_VARS (block
) = decls
;
1005 BLOCK_TYPE_TAGS (block
) = tags
;
1006 BLOCK_SUBBLOCKS (block
) = subblocks
;
1007 remember_end_note (block
);
1010 /* In each subblock, record that this is its superior. */
1012 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1013 BLOCK_SUPERCONTEXT (link
) = block
;
1015 /* Clear out the meanings of the local variables of this level. */
1017 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1019 if (DECL_NAME (link
) != 0)
1021 /* If the ident. was used or addressed via a local extern decl,
1022 don't forget that fact. */
1023 if (DECL_EXTERNAL (link
))
1025 if (TREE_USED (link
))
1026 TREE_USED (DECL_NAME (link
)) = 1;
1027 if (TREE_ADDRESSABLE (link
))
1028 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1030 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1034 /* Restore all name-meanings of the outer levels
1035 that were shadowed by this level. */
1037 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1038 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1040 /* If the level being exited is the top level of a function,
1041 check over all the labels, and clear out the current
1042 (function local) meanings of their names. */
1046 /* If this is the top level block of a function,
1047 the vars are the function's parameters.
1048 Don't leave them in the BLOCK because they are
1049 found in the FUNCTION_DECL instead. */
1051 BLOCK_VARS (block
) = 0;
1053 /* Clear out the definitions of all label names,
1054 since their scopes end here,
1055 and add them to BLOCK_VARS. */
1057 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1059 register tree label
= TREE_VALUE (link
);
1061 if (DECL_INITIAL (label
) == 0)
1063 error_with_decl (label
, "label `%s' used but not defined");
1064 /* Avoid crashing later. */
1065 define_label (input_filename
, lineno
,
1068 else if (warn_unused
&& !TREE_USED (label
))
1069 warning_with_decl (label
, "label `%s' defined but not used");
1070 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1072 /* Put the labels into the "variables" of the
1073 top-level block, so debugger can see them. */
1074 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1075 BLOCK_VARS (block
) = label
;
1079 /* Pop the current level, and free the structure for reuse. */
1082 register struct binding_level
*level
= current_binding_level
;
1083 current_binding_level
= current_binding_level
->level_chain
;
1085 level
->level_chain
= free_binding_level
;
1086 free_binding_level
= level
;
1089 /* Dispose of the block that we just made inside some higher level. */
1091 DECL_INITIAL (current_function_decl
) = block
;
1094 if (!block_previously_created
)
1095 current_binding_level
->blocks
1096 = chainon (current_binding_level
->blocks
, block
);
1098 /* If we did not make a block for the level just exited,
1099 any blocks made for inner levels
1100 (since they cannot be recorded as subblocks in that level)
1101 must be carried forward so they will later become subblocks
1102 of something else. */
1104 current_binding_level
->blocks
1105 = chainon (current_binding_level
->blocks
, subblocks
);
1107 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1108 binding contour so that they point to the appropriate construct, i.e.
1109 either to the current FUNCTION_DECL node, or else to the BLOCK node
1110 we just constructed.
1112 Note that for tagged types whose scope is just the formal parameter
1113 list for some function type specification, we can't properly set
1114 their TYPE_CONTEXTs here, because we don't have a pointer to the
1115 appropriate FUNCTION_TYPE node readily available to us. For those
1116 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1117 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1118 node which will represent the "scope" for these "parameter list local"
1123 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1124 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1126 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1127 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1130 TREE_USED (block
) = 1;
1134 /* Delete the node BLOCK from the current binding level.
1135 This is used for the block inside a stmt expr ({...})
1136 so that the block can be reinserted where appropriate. */
1139 delete_block (block
)
1143 if (current_binding_level
->blocks
== block
)
1144 current_binding_level
->blocks
= TREE_CHAIN (block
);
1145 for (t
= current_binding_level
->blocks
; t
;)
1147 if (TREE_CHAIN (t
) == block
)
1148 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1152 TREE_CHAIN (block
) = NULL
;
1153 /* Clear TREE_USED which is always set by poplevel.
1154 The flag is set again if insert_block is called. */
1155 TREE_USED (block
) = 0;
1158 /* Insert BLOCK at the end of the list of subblocks of the
1159 current binding level. This is used when a BIND_EXPR is expanded,
1160 to handle the BLOCK node inside the BIND_EXPR. */
1163 insert_block (block
)
1166 TREE_USED (block
) = 1;
1167 current_binding_level
->blocks
1168 = chainon (current_binding_level
->blocks
, block
);
1171 /* Set the BLOCK node for the innermost scope
1172 (the one we are currently in). */
1176 register tree block
;
1178 current_binding_level
->this_block
= block
;
1184 register struct binding_level
*newlevel
;
1186 /* Reuse or create a struct for this binding level. */
1188 if (free_binding_level
)
1190 newlevel
= free_binding_level
;
1191 free_binding_level
= free_binding_level
->level_chain
;
1195 newlevel
= make_binding_level ();
1198 /* Add this level to the front of the chain (stack) of label levels. */
1200 newlevel
->level_chain
= label_level_chain
;
1201 label_level_chain
= newlevel
;
1203 newlevel
->names
= named_labels
;
1204 newlevel
->shadowed
= shadowed_labels
;
1206 shadowed_labels
= 0;
1212 register struct binding_level
*level
= label_level_chain
;
1215 /* Clear out the definitions of the declared labels in this level.
1216 Leave in the list any ordinary, non-declared labels. */
1217 for (link
= named_labels
, prev
= 0; link
;)
1219 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1221 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1223 error_with_decl (TREE_VALUE (link
),
1224 "label `%s' used but not defined");
1225 /* Avoid crashing later. */
1226 define_label (input_filename
, lineno
,
1227 DECL_NAME (TREE_VALUE (link
)));
1229 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1230 warning_with_decl (TREE_VALUE (link
),
1231 "label `%s' defined but not used");
1232 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1234 /* Delete this element from the list. */
1235 link
= TREE_CHAIN (link
);
1237 TREE_CHAIN (prev
) = link
;
1239 named_labels
= link
;
1244 link
= TREE_CHAIN (link
);
1248 /* Bring back all the labels that were shadowed. */
1249 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1250 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1251 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1252 = TREE_VALUE (link
);
1254 named_labels
= chainon (named_labels
, level
->names
);
1255 shadowed_labels
= level
->shadowed
;
1257 /* Pop the current level, and free the structure for reuse. */
1258 label_level_chain
= label_level_chain
->level_chain
;
1259 level
->level_chain
= free_binding_level
;
1260 free_binding_level
= level
;
1263 /* Push a definition or a declaration of struct, union or enum tag "name".
1264 "type" should be the type node.
1265 We assume that the tag "name" is not already defined.
1267 Note that the definition may really be just a forward reference.
1268 In that case, the TYPE_SIZE will be zero. */
1271 pushtag (name
, type
)
1274 register struct binding_level
*b
;
1276 /* Find the proper binding level for this type tag. */
1278 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1283 /* Record the identifier as the type's name if it has none. */
1285 if (TYPE_NAME (type
) == 0)
1286 TYPE_NAME (type
) = name
;
1289 if (b
== global_binding_level
)
1290 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1292 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1294 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1295 tagged type we just added to the current binding level. This fake
1296 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1297 to output a representation of a tagged type, and it also gives
1298 us a convenient place to record the "scope start" address for the
1301 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1304 /* Handle when a new declaration NEWDECL
1305 has the same name as an old one OLDDECL
1306 in the same binding contour.
1307 Prints an error message if appropriate.
1309 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1310 Otherwise, return 0. */
1313 duplicate_decls (newdecl
, olddecl
)
1314 register tree newdecl
, olddecl
;
1316 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1317 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1318 && DECL_INITIAL (newdecl
) != 0);
1319 tree oldtype
= TREE_TYPE (olddecl
);
1320 tree newtype
= TREE_TYPE (newdecl
);
1323 if (TREE_CODE_CLASS (TREE_CODE (olddecl
)) == 'd')
1324 DECL_MACHINE_ATTRIBUTES (newdecl
) = DECL_MACHINE_ATTRIBUTES (olddecl
);
1326 if (TREE_CODE (newtype
) == ERROR_MARK
1327 || TREE_CODE (oldtype
) == ERROR_MARK
)
1330 /* New decl is completely inconsistent with the old one =>
1331 tell caller to replace the old one.
1332 This is always an error except in the case of shadowing a builtin. */
1333 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1335 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1336 && (DECL_BUILT_IN (olddecl
)
1337 || DECL_BUILT_IN_NONANSI (olddecl
)))
1339 /* If you declare a built-in or predefined function name as static,
1340 the old definition is overridden,
1341 but optionally warn this was a bad choice of name. */
1342 if (!TREE_PUBLIC (newdecl
))
1346 else if (DECL_BUILT_IN (olddecl
))
1347 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1349 warning_with_decl (newdecl
, "shadowing library function `%s'");
1351 /* Likewise, if the built-in is not ansi, then programs can
1352 override it even globally without an error. */
1353 else if (! DECL_BUILT_IN (olddecl
))
1354 warning_with_decl (newdecl
,
1355 "library function `%s' declared as non-function");
1357 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1358 warning_with_decl (newdecl
,
1359 "built-in function `%s' declared as non-function");
1361 warning_with_decl (newdecl
,
1362 "built-in function `%s' declared as non-function");
1366 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1367 error_with_decl (olddecl
, "previous declaration of `%s'");
1373 /* For real parm decl following a forward decl,
1374 return 1 so old decl will be reused. */
1375 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1376 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1379 /* The new declaration is the same kind of object as the old one.
1380 The declarations may partially match. Print warnings if they don't
1381 match enough. Ultimately, copy most of the information from the new
1382 decl to the old one, and keep using the old one. */
1384 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1385 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1386 && DECL_INITIAL (olddecl
) == 0)
1387 /* If -traditional, avoid error for redeclaring fcn
1388 after implicit decl. */
1390 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1391 && DECL_BUILT_IN (olddecl
))
1393 /* A function declaration for a built-in function. */
1394 if (!TREE_PUBLIC (newdecl
))
1396 /* If you declare a built-in function name as static, the
1397 built-in definition is overridden,
1398 but optionally warn this was a bad choice of name. */
1400 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1401 /* Discard the old built-in function. */
1404 else if (!types_match
)
1406 /* Accept the return type of the new declaration if same modes. */
1407 tree oldreturntype
= TREE_TYPE (TREE_TYPE (olddecl
));
1408 tree newreturntype
= TREE_TYPE (TREE_TYPE (newdecl
));
1410 /* Make sure we put the new type in the same obstack as the old ones.
1411 If the old types are not both in the same obstack, use the
1413 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1414 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1417 push_obstacks_nochange ();
1418 end_temporary_allocation ();
1421 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1423 /* Function types may be shared, so we can't just modify
1424 the return type of olddecl's function type. */
1426 = build_function_type (newreturntype
,
1427 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)));
1429 types_match
= comptypes (TREE_TYPE (newdecl
), newtype
);
1431 TREE_TYPE (olddecl
) = newtype
;
1433 /* Accept harmless mismatch in first argument type also.
1435 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1436 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0
1437 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))) != 0
1438 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl
))) != 0
1439 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))))
1441 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))))
1443 /* Function types may be shared, so we can't just modify
1444 the return type of olddecl's function type. */
1446 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl
)),
1447 tree_cons (NULL_TREE
,
1448 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))),
1449 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))));
1451 types_match
= comptypes (TREE_TYPE (newdecl
), newtype
);
1453 TREE_TYPE (olddecl
) = newtype
;
1460 /* If types don't match for a built-in, throw away the built-in. */
1461 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1465 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1466 && DECL_SOURCE_LINE (olddecl
) == 0)
1468 /* A function declaration for a predeclared function
1469 that isn't actually built in. */
1470 if (!TREE_PUBLIC (newdecl
))
1472 /* If you declare it as static, the
1473 default definition is overridden. */
1476 else if (!types_match
)
1478 /* If the types don't match, preserve volatility indication.
1479 Later on, we will discard everything else about the
1480 default declaration. */
1481 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1484 /* Permit char *foo () to match void *foo (...) if not pedantic,
1485 if one of them came from a system header file. */
1486 else if (!types_match
1487 && TREE_CODE (olddecl
) == FUNCTION_DECL
1488 && TREE_CODE (newdecl
) == FUNCTION_DECL
1489 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1490 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1491 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1492 || DECL_IN_SYSTEM_HEADER (newdecl
))
1493 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1494 && TYPE_ARG_TYPES (oldtype
) == 0
1495 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1496 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1498 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1499 && TYPE_ARG_TYPES (newtype
) == 0
1500 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1501 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1504 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1505 /* Make sure we keep void * as ret type, not char *. */
1506 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1507 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1509 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1510 we will come back here again. */
1511 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1513 else if (!types_match
1514 /* Permit char *foo (int, ...); followed by char *foo ();
1516 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1518 /* Return types must still match. */
1519 && comptypes (TREE_TYPE (oldtype
),
1520 TREE_TYPE (newtype
))
1521 && TYPE_ARG_TYPES (newtype
) == 0))
1523 error_with_decl (newdecl
, "conflicting types for `%s'");
1524 /* Check for function type mismatch
1525 involving an empty arglist vs a nonempty one. */
1526 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1527 && comptypes (TREE_TYPE (oldtype
),
1528 TREE_TYPE (newtype
))
1529 && ((TYPE_ARG_TYPES (oldtype
) == 0
1530 && DECL_INITIAL (olddecl
) == 0)
1532 (TYPE_ARG_TYPES (newtype
) == 0
1533 && DECL_INITIAL (newdecl
) == 0)))
1535 /* Classify the problem further. */
1536 register tree t
= TYPE_ARG_TYPES (oldtype
);
1538 t
= TYPE_ARG_TYPES (newtype
);
1539 for (; t
; t
= TREE_CHAIN (t
))
1541 register tree type
= TREE_VALUE (t
);
1543 if (TREE_CHAIN (t
) == 0
1544 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1546 error ("A parameter list with an ellipsis can't match");
1547 error ("an empty parameter name list declaration.");
1551 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1552 || C_PROMOTING_INTEGER_TYPE_P (type
))
1554 error ("An argument type that has a default promotion");
1555 error ("can't match an empty parameter name list declaration.");
1560 error_with_decl (olddecl
, "previous declaration of `%s'");
1564 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1567 error_with_decl (newdecl
, errmsg
);
1568 error_with_decl (olddecl
,
1569 ((DECL_INITIAL (olddecl
)
1570 && current_binding_level
== global_binding_level
)
1571 ? "`%s' previously defined here"
1572 : "`%s' previously declared here"));
1574 else if (TREE_CODE (newdecl
) == TYPE_DECL
1575 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1576 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1578 warning_with_decl (newdecl
, "redefinition of `%s'");
1581 ((DECL_INITIAL (olddecl
)
1582 && current_binding_level
== global_binding_level
)
1583 ? "`%s' previously defined here"
1584 : "`%s' previously declared here"));
1586 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1587 && DECL_INITIAL (olddecl
) != 0
1588 && TYPE_ARG_TYPES (oldtype
) == 0
1589 && TYPE_ARG_TYPES (newtype
) != 0
1590 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1592 register tree type
, parm
;
1594 /* Prototype decl follows defn w/o prototype. */
1596 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1597 type
= TYPE_ARG_TYPES (newtype
),
1599 (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) != void_type_node
1600 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
1601 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1603 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1604 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1606 errmsg
= "prototype for `%s' follows and number of arguments";
1609 /* Type for passing arg must be consistent
1610 with that declared for the arg. */
1611 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1612 /* If -traditional, allow `unsigned int' instead of `int'
1613 in the prototype. */
1614 && (! (flag_traditional
1615 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1616 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1618 errmsg
= "prototype for `%s' follows and argument %d";
1624 error_with_decl (newdecl
, errmsg
, nargs
);
1625 error_with_decl (olddecl
,
1626 "doesn't match non-prototype definition here");
1630 warning_with_decl (newdecl
, "prototype for `%s' follows");
1631 warning_with_decl (olddecl
, "non-prototype definition here");
1634 /* Warn about mismatches in various flags. */
1637 /* Warn if function is now inline
1638 but was previously declared not inline and has been called. */
1639 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1640 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1641 && TREE_USED (olddecl
))
1642 warning_with_decl (newdecl
,
1643 "`%s' declared inline after being called");
1644 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1645 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1646 && DECL_INITIAL (olddecl
) != 0)
1647 warning_with_decl (newdecl
,
1648 "`%s' declared inline after its definition");
1650 /* If pedantic, warn when static declaration follows a non-static
1651 declaration. Otherwise, do so only for functions. */
1652 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1653 && TREE_PUBLIC (olddecl
)
1654 && !TREE_PUBLIC (newdecl
))
1655 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1657 /* Warn when const declaration follows a non-const
1658 declaration, but not for functions. */
1659 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1660 && !TREE_READONLY (olddecl
)
1661 && TREE_READONLY (newdecl
))
1662 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1663 /* These bits are logically part of the type, for variables.
1664 But not for functions
1665 (where qualifiers are not valid ANSI anyway). */
1666 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1667 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1668 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1669 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1673 /* Optionally warn about more than one declaration for the same name. */
1674 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1675 /* Dont warn about a function declaration
1676 followed by a definition. */
1677 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1678 && DECL_INITIAL (olddecl
) == 0)
1679 /* Don't warn about extern decl followed by (tentative) definition. */
1680 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1682 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1683 warning_with_decl (olddecl
, "previous declaration of `%s'");
1686 /* Copy all the DECL_... slots specified in the new decl
1687 except for any that we copy here from the old type.
1689 Past this point, we don't change OLDTYPE and NEWTYPE
1690 even if we change the types of NEWDECL and OLDDECL. */
1694 /* Make sure we put the new type in the same obstack as the old ones.
1695 If the old types are not both in the same obstack, use the permanent
1697 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1698 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1701 push_obstacks_nochange ();
1702 end_temporary_allocation ();
1705 /* Merge the data types specified in the two decls. */
1706 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1708 = TREE_TYPE (olddecl
)
1709 = common_type (newtype
, oldtype
);
1711 /* Lay the type out, unless already done. */
1712 if (oldtype
!= TREE_TYPE (newdecl
))
1714 if (TREE_TYPE (newdecl
) != error_mark_node
)
1715 layout_type (TREE_TYPE (newdecl
));
1716 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1717 && TREE_CODE (newdecl
) != TYPE_DECL
1718 && TREE_CODE (newdecl
) != CONST_DECL
)
1719 layout_decl (newdecl
, 0);
1723 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1724 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1725 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1726 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1727 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1730 /* Keep the old rtl since we can safely use it. */
1731 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1733 /* Merge the type qualifiers. */
1734 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1735 && !TREE_THIS_VOLATILE (newdecl
))
1736 TREE_THIS_VOLATILE (olddecl
) = 0;
1737 if (TREE_READONLY (newdecl
))
1738 TREE_READONLY (olddecl
) = 1;
1739 if (TREE_THIS_VOLATILE (newdecl
))
1741 TREE_THIS_VOLATILE (olddecl
) = 1;
1742 if (TREE_CODE (newdecl
) == VAR_DECL
)
1743 make_var_volatile (newdecl
);
1746 /* Keep source location of definition rather than declaration.
1747 Likewise, keep decl at outer scope. */
1748 if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1749 || (DECL_CONTEXT (newdecl
) != 0 && DECL_CONTEXT (olddecl
) == 0))
1751 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1752 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1754 if (DECL_CONTEXT (olddecl
) == 0)
1755 DECL_CONTEXT (newdecl
) = 0;
1758 /* Merge the unused-warning information. */
1759 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1760 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1761 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1762 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1764 /* Merge the initialization information. */
1765 if (DECL_INITIAL (newdecl
) == 0)
1766 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1768 /* Merge the section attribute.
1769 We want to issue an error if the sections conflict but that must be
1770 done later in decl_attributes since we are called before attributes
1772 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1773 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1775 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1777 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1778 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1783 /* If cannot merge, then use the new type and qualifiers,
1784 and don't preserve the old rtl. */
1787 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1788 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1789 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1790 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1793 /* Merge the storage class information. */
1794 /* For functions, static overrides non-static. */
1795 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1797 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1798 /* This is since we don't automatically
1799 copy the attributes of NEWDECL into OLDDECL. */
1800 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1801 /* If this clears `static', clear it in the identifier too. */
1802 if (! TREE_PUBLIC (olddecl
))
1803 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1805 if (DECL_EXTERNAL (newdecl
))
1807 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1808 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1809 /* An extern decl does not override previous storage class. */
1810 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1814 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1815 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1818 /* If either decl says `inline', this fn is inline,
1819 unless its definition was passed already. */
1820 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1821 DECL_INLINE (olddecl
) = 1;
1822 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1824 /* Get rid of any built-in function if new arg types don't match it
1825 or if we have a function definition. */
1826 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1827 && DECL_BUILT_IN (olddecl
)
1828 && (!types_match
|| new_is_definition
))
1830 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1831 DECL_BUILT_IN (olddecl
) = 0;
1834 /* If redeclaring a builtin function, and not a definition,
1836 Also preserve various other info from the definition. */
1837 if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& !new_is_definition
)
1839 if (DECL_BUILT_IN (olddecl
))
1841 DECL_BUILT_IN (newdecl
) = 1;
1842 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1845 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1847 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1848 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1849 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1850 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1853 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1854 But preserve OLDdECL's DECL_UID. */
1856 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1858 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1859 (char *) olddecl
+ sizeof (struct tree_common
),
1860 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1861 DECL_UID (olddecl
) = olddecl_uid
;
1867 /* Record a decl-node X as belonging to the current lexical scope.
1868 Check for errors (such as an incompatible declaration for the same
1869 name already seen in the same scope).
1871 Returns either X or an old decl for the same name.
1872 If an old decl is returned, it may have been smashed
1873 to agree with what X says. */
1880 register tree name
= DECL_NAME (x
);
1881 register struct binding_level
*b
= current_binding_level
;
1883 DECL_CONTEXT (x
) = current_function_decl
;
1884 /* A local extern declaration for a function doesn't constitute nesting.
1885 A local auto declaration does, since it's a forward decl
1886 for a nested function coming later. */
1887 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
1888 && DECL_EXTERNAL (x
))
1889 DECL_CONTEXT (x
) = 0;
1891 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
1892 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
1893 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1894 && !DECL_IN_SYSTEM_HEADER (x
))
1895 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
1902 /* Don't type check externs here when -traditional. This is so that
1903 code with conflicting declarations inside blocks will get warnings
1904 not errors. X11 for instance depends on this. */
1905 if (DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
1906 t
= lookup_name_current_level_global (name
);
1908 t
= lookup_name_current_level (name
);
1909 if (t
!= 0 && t
== error_mark_node
)
1910 /* error_mark_node is 0 for a while during initialization! */
1913 error_with_decl (x
, "`%s' used prior to declaration");
1918 file
= DECL_SOURCE_FILE (t
);
1919 line
= DECL_SOURCE_LINE (t
);
1922 if (t
!= 0 && duplicate_decls (x
, t
))
1924 if (TREE_CODE (t
) == PARM_DECL
)
1926 /* Don't allow more than one "real" duplicate
1927 of a forward parm decl. */
1928 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
1931 /* If this decl is `static' and an implicit decl was seen previously,
1932 warn. But don't complain if -traditional,
1933 since traditional compilers don't complain. */
1934 if (!flag_traditional
&& TREE_PUBLIC (name
)
1935 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
)
1936 /* We used to warn also for explicit extern followed by static,
1937 but sometimes you need to do it that way. */
1938 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
1940 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1941 IDENTIFIER_POINTER (name
));
1942 pedwarn_with_file_and_line (file
, line
,
1943 "previous declaration of `%s'",
1944 IDENTIFIER_POINTER (name
));
1947 /* If this is a global decl, and there exists a conflicting local
1948 decl in a parent block, then we can't return as yet, because we
1949 need to register this decl in the current binding block. */
1950 if (! TREE_PUBLIC (x
) || lookup_name (name
) == t
)
1954 /* If we are processing a typedef statement, generate a whole new
1955 ..._TYPE node (which will be just an variant of the existing
1956 ..._TYPE node with identical properties) and then install the
1957 TYPE_DECL node generated to represent the typedef name as the
1958 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1960 The whole point here is to end up with a situation where each
1961 and every ..._TYPE node the compiler creates will be uniquely
1962 associated with AT MOST one node representing a typedef name.
1963 This way, even though the compiler substitutes corresponding
1964 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1965 early on, later parts of the compiler can always do the reverse
1966 translation and get back the corresponding typedef name. For
1969 typedef struct S MY_TYPE;
1972 Later parts of the compiler might only know that `object' was of
1973 type `struct S' if if were not for code just below. With this
1974 code however, later parts of the compiler see something like:
1976 struct S' == struct S
1977 typedef struct S' MY_TYPE;
1980 And they can then deduce (from the node for type struct S') that
1981 the original object declaration was:
1985 Being able to do this is important for proper support of protoize,
1986 and also for generating precise symbolic debugging information
1987 which takes full account of the programmer's (typedef) vocabulary.
1989 Obviously, we don't want to generate a duplicate ..._TYPE node if
1990 the TYPE_DECL node that we are now processing really represents a
1991 standard built-in type.
1993 Since all standard types are effectively declared at line zero
1994 in the source file, we can easily check to see if we are working
1995 on a standard type by checking the current value of lineno. */
1997 if (TREE_CODE (x
) == TYPE_DECL
)
1999 if (DECL_SOURCE_LINE (x
) == 0)
2001 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2002 TYPE_NAME (TREE_TYPE (x
)) = x
;
2004 else if (TREE_TYPE (x
) != error_mark_node
)
2006 tree tt
= TREE_TYPE (x
);
2008 tt
= build_type_copy (tt
);
2014 /* Multiple external decls of the same identifier ought to match.
2015 Check against both global declarations (when traditional) and out of
2016 scope (limbo) block level declarations.
2018 We get warnings about inline functions where they are defined.
2019 Avoid duplicate warnings where they are used. */
2020 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
))
2024 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2025 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2026 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2027 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2028 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2029 /* Decls in limbo are always extern, so no need to check that. */
2030 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2034 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2035 /* If old decl is built-in, we already warned if we should. */
2036 && !DECL_BUILT_IN (decl
))
2038 pedwarn_with_decl (x
,
2039 "type mismatch with previous external decl");
2040 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2044 /* If a function has had an implicit declaration, and then is defined,
2045 make sure they are compatible. */
2047 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2048 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2049 && TREE_CODE (x
) == FUNCTION_DECL
2050 && ! comptypes (TREE_TYPE (x
),
2051 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2053 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2054 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2055 "previous implicit declaration of `%s'");
2058 /* In PCC-compatibility mode, extern decls of vars with no current decl
2059 take effect at top level no matter where they are. */
2060 if (flag_traditional
&& DECL_EXTERNAL (x
)
2061 && lookup_name (name
) == 0)
2063 tree type
= TREE_TYPE (x
);
2065 /* But don't do this if the type contains temporary nodes. */
2068 if (type
== error_mark_node
)
2070 if (! TREE_PERMANENT (type
))
2072 warning_with_decl (x
, "type of external `%s' is not global");
2073 /* By exiting the loop early, we leave TYPE nonzero,
2074 and thus prevent globalization of the decl. */
2077 else if (TREE_CODE (type
) == FUNCTION_TYPE
2078 && TYPE_ARG_TYPES (type
) != 0)
2079 /* The types might not be truly local,
2080 but the list of arg types certainly is temporary.
2081 Since prototypes are nontraditional,
2082 ok not to do the traditional thing. */
2084 type
= TREE_TYPE (type
);
2088 b
= global_binding_level
;
2091 /* This name is new in its binding level.
2092 Install the new declaration and return it. */
2093 if (b
== global_binding_level
)
2095 /* Install a global value. */
2097 /* If the first global decl has external linkage,
2098 warn if we later see static one. */
2099 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2100 TREE_PUBLIC (name
) = 1;
2102 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2104 /* We no longer care about any previous block level declarations. */
2105 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2107 /* Don't forget if the function was used via an implicit decl. */
2108 if (IDENTIFIER_IMPLICIT_DECL (name
)
2109 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2110 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2112 /* Don't forget if its address was taken in that way. */
2113 if (IDENTIFIER_IMPLICIT_DECL (name
)
2114 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2115 TREE_ADDRESSABLE (x
) = 1;
2117 /* Warn about mismatches against previous implicit decl. */
2118 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2119 /* If this real decl matches the implicit, don't complain. */
2120 && ! (TREE_CODE (x
) == FUNCTION_DECL
2121 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2122 == integer_type_node
)))
2123 pedwarn ("`%s' was previously implicitly declared to return `int'",
2124 IDENTIFIER_POINTER (name
));
2126 /* If this decl is `static' and an `extern' was seen previously,
2127 that is erroneous. */
2128 if (TREE_PUBLIC (name
)
2129 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2131 /* Okay to redeclare an ANSI built-in as static. */
2132 if (t
!= 0 && DECL_BUILT_IN (t
))
2134 /* Okay to declare a non-ANSI built-in as anything. */
2135 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2137 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2138 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2139 IDENTIFIER_POINTER (name
));
2141 pedwarn ("`%s' was declared `extern' and later `static'",
2142 IDENTIFIER_POINTER (name
));
2147 /* Here to install a non-global value. */
2148 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2149 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2150 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2152 /* If this is an extern function declaration, see if we
2153 have a global definition or declaration for the function. */
2155 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2157 && TREE_CODE (x
) == FUNCTION_DECL
2158 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2160 /* We have one. Their types must agree. */
2161 if (! comptypes (TREE_TYPE (x
),
2162 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2163 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2166 /* Inner extern decl is inline if global one is.
2167 Copy enough to really inline it. */
2168 if (DECL_INLINE (oldglobal
))
2170 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2171 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2172 ? 0 : DECL_INITIAL (oldglobal
));
2173 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2174 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2175 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2176 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2177 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2178 DECL_ABSTRACT_ORIGIN (x
) = oldglobal
;
2180 /* Inner extern decl is built-in if global one is. */
2181 if (DECL_BUILT_IN (oldglobal
))
2183 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2184 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2186 /* Keep the arg types from a file-scope fcn defn. */
2187 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2188 && DECL_INITIAL (oldglobal
)
2189 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2190 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2194 #if 0 /* This case is probably sometimes the right thing to do. */
2195 /* If we have a local external declaration,
2196 then any file-scope declaration should not
2197 have been static. */
2198 if (oldlocal
== 0 && oldglobal
!= 0
2199 && !TREE_PUBLIC (oldglobal
)
2200 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2201 warning ("`%s' locally external but globally static",
2202 IDENTIFIER_POINTER (name
));
2205 /* If we have a local external declaration,
2206 and no file-scope declaration has yet been seen,
2207 then if we later have a file-scope decl it must not be static. */
2210 && DECL_EXTERNAL (x
)
2213 TREE_PUBLIC (name
) = 1;
2215 /* Save this decl, so that we can do type checking against
2216 other decls after it falls out of scope.
2218 Only save it once. This prevents temporary decls created in
2219 expand_inline_function from being used here, since this
2220 will have been set when the inline function was parsed.
2221 It also helps give slightly better warnings. */
2222 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2223 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2226 /* Warn if shadowing an argument at the top level of the body. */
2227 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2228 /* This warning doesn't apply to the parms of a nested fcn. */
2229 && ! current_binding_level
->parm_flag
2230 /* Check that this is one level down from the parms. */
2231 && current_binding_level
->level_chain
->parm_flag
2232 /* Check that the decl being shadowed
2233 comes from the parm level, one level up. */
2234 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2236 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2237 pedwarn ("declaration of `%s' shadows a parameter",
2238 IDENTIFIER_POINTER (name
));
2240 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2241 IDENTIFIER_POINTER (name
));
2244 /* Maybe warn if shadowing something else. */
2245 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2246 /* No shadow warnings for internally generated vars. */
2247 && DECL_SOURCE_LINE (x
) != 0
2248 /* No shadow warnings for vars made for inlining. */
2249 && ! DECL_FROM_INLINE (x
))
2251 char *warnstring
= 0;
2253 if (TREE_CODE (x
) == PARM_DECL
2254 && current_binding_level
->level_chain
->parm_flag
)
2255 /* Don't warn about the parm names in function declarator
2256 within a function declarator.
2257 It would be nice to avoid warning in any function
2258 declarator in a declaration, as opposed to a definition,
2259 but there is no way to tell it's not a definition. */
2261 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2262 warnstring
= "declaration of `%s' shadows a parameter";
2263 else if (oldlocal
!= 0)
2264 warnstring
= "declaration of `%s' shadows previous local";
2265 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2266 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2267 warnstring
= "declaration of `%s' shadows global declaration";
2270 warning (warnstring
, IDENTIFIER_POINTER (name
));
2273 /* If storing a local value, there may already be one (inherited).
2274 If so, record it for restoration when this binding level ends. */
2276 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2279 /* Keep count of variables in this level with incomplete type. */
2280 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2284 /* Put decls on list in reverse order.
2285 We will reverse them later if necessary. */
2286 TREE_CHAIN (x
) = b
->names
;
2292 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2295 pushdecl_top_level (x
)
2299 register struct binding_level
*b
= current_binding_level
;
2301 current_binding_level
= global_binding_level
;
2303 current_binding_level
= b
;
2308 /* Invoke finish_decl at the global binding level. */
2311 finish_decl_top_level (d
, i
, a
)
2314 register struct binding_level
*b
= current_binding_level
;
2316 current_binding_level
= global_binding_level
;
2317 finish_decl (d
, i
, a
);
2318 current_binding_level
= b
;
2321 /* Generate an implicit declaration for identifier FUNCTIONID
2322 as a function of type int (). Print a warning if appropriate. */
2325 implicitly_declare (functionid
)
2329 int traditional_warning
= 0;
2330 /* Only one "implicit declaration" warning per identifier. */
2331 int implicit_warning
;
2333 /* Save the decl permanently so we can warn if definition follows. */
2334 push_obstacks_nochange ();
2335 end_temporary_allocation ();
2337 /* We used to reuse an old implicit decl here,
2338 but this loses with inline functions because it can clobber
2339 the saved decl chains. */
2340 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2341 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2343 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2345 /* Warn of implicit decl following explicit local extern decl.
2346 This is probably a program designed for traditional C. */
2347 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2348 traditional_warning
= 1;
2350 /* Warn once of an implicit declaration. */
2351 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2353 DECL_EXTERNAL (decl
) = 1;
2354 TREE_PUBLIC (decl
) = 1;
2356 /* Record that we have an implicit decl and this is it. */
2357 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2359 /* ANSI standard says implicit declarations are in the innermost block.
2360 So we record the decl in the standard fashion.
2361 If flag_traditional is set, pushdecl does it top-level. */
2364 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2365 maybe_objc_check_decl (decl
);
2367 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2369 if (warn_implicit
&& implicit_warning
)
2370 warning ("implicit declaration of function `%s'",
2371 IDENTIFIER_POINTER (functionid
));
2372 else if (warn_traditional
&& traditional_warning
)
2373 warning ("function `%s' was previously declared within a block",
2374 IDENTIFIER_POINTER (functionid
));
2376 /* Write a record describing this implicit function declaration to the
2377 prototypes file (if requested). */
2379 gen_aux_info_record (decl
, 0, 1, 0);
2386 /* Return zero if the declaration NEWDECL is valid
2387 when the declaration OLDDECL (assumed to be for the same name)
2388 has already been seen.
2389 Otherwise return an error message format string with a %s
2390 where the identifier should go. */
2393 redeclaration_error_message (newdecl
, olddecl
)
2394 tree newdecl
, olddecl
;
2396 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2398 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2400 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2402 return "redefinition of `%s'";
2404 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2406 /* Declarations of functions can insist on internal linkage
2407 but they can't be inconsistent with internal linkage,
2408 so there can be no error on that account.
2409 However defining the same name twice is no good. */
2410 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2411 /* However, defining once as extern inline and a second
2412 time in another way is ok. */
2413 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2414 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2415 return "redefinition of `%s'";
2418 else if (current_binding_level
== global_binding_level
)
2420 /* Objects declared at top level: */
2421 /* If at least one is a reference, it's ok. */
2422 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2424 /* Reject two definitions. */
2425 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2426 return "redefinition of `%s'";
2427 /* Now we have two tentative defs, or one tentative and one real def. */
2428 /* Insist that the linkage match. */
2429 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2430 return "conflicting declarations of `%s'";
2433 else if (current_binding_level
->parm_flag
2434 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2438 /* Newdecl has block scope. If olddecl has block scope also, then
2439 reject two definitions, and reject a definition together with an
2440 external reference. Otherwise, it is OK, because newdecl must
2441 be an extern reference to olddecl. */
2442 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2443 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2444 return "redeclaration of `%s'";
2449 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2450 Create one if none exists so far for the current function.
2451 This function is called for both label definitions and label references. */
2457 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2459 if (current_function_decl
== 0)
2461 error ("label %s referenced outside of any function",
2462 IDENTIFIER_POINTER (id
));
2466 /* Use a label already defined or ref'd with this name. */
2469 /* But not if it is inherited and wasn't declared to be inheritable. */
2470 if (DECL_CONTEXT (decl
) != current_function_decl
2471 && ! C_DECLARED_LABEL_FLAG (decl
))
2472 return shadow_label (id
);
2476 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2478 /* Make sure every label has an rtx. */
2481 /* A label not explicitly declared must be local to where it's ref'd. */
2482 DECL_CONTEXT (decl
) = current_function_decl
;
2484 DECL_MODE (decl
) = VOIDmode
;
2486 /* Say where one reference is to the label,
2487 for the sake of the error if it is not defined. */
2488 DECL_SOURCE_LINE (decl
) = lineno
;
2489 DECL_SOURCE_FILE (decl
) = input_filename
;
2491 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2493 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2498 /* Make a label named NAME in the current function,
2499 shadowing silently any that may be inherited from containing functions
2500 or containing scopes.
2502 Note that valid use, if the label being shadowed
2503 comes from another scope in the same function,
2504 requires calling declare_nonlocal_label right away. */
2510 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2516 /* Check to make sure that the label hasn't already been declared
2517 at this label scope */
2518 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2519 if (TREE_VALUE (dup
) == decl
)
2521 error ("duplicate label declaration `%s'",
2522 IDENTIFIER_POINTER (name
));
2523 error_with_decl (TREE_VALUE (dup
),
2524 "this is a previous declaration");
2525 /* Just use the previous declaration. */
2526 return lookup_label (name
);
2529 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2530 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2533 return lookup_label (name
);
2536 /* Define a label, specifying the location in the source file.
2537 Return the LABEL_DECL node for the label, if the definition is valid.
2538 Otherwise return 0. */
2541 define_label (filename
, line
, name
)
2546 tree decl
= lookup_label (name
);
2548 /* If label with this name is known from an outer context, shadow it. */
2549 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2551 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2552 IDENTIFIER_LABEL_VALUE (name
) = 0;
2553 decl
= lookup_label (name
);
2556 if (DECL_INITIAL (decl
) != 0)
2558 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2563 /* Mark label as having been defined. */
2564 DECL_INITIAL (decl
) = error_mark_node
;
2565 /* Say where in the source. */
2566 DECL_SOURCE_FILE (decl
) = filename
;
2567 DECL_SOURCE_LINE (decl
) = line
;
2572 /* Return the list of declarations of the current level.
2573 Note that this list is in reverse order unless/until
2574 you nreverse it; and when you do nreverse it, you must
2575 store the result back using `storedecls' or you will lose. */
2580 return current_binding_level
->names
;
2583 /* Return the list of type-tags (for structs, etc) of the current level. */
2588 return current_binding_level
->tags
;
2591 /* Store the list of declarations of the current level.
2592 This is done for the parameter declarations of a function being defined,
2593 after they are modified in the light of any missing parameters. */
2599 current_binding_level
->names
= decls
;
2602 /* Similarly, store the list of tags of the current level. */
2608 current_binding_level
->tags
= tags
;
2611 /* Given NAME, an IDENTIFIER_NODE,
2612 return the structure (or union or enum) definition for that name.
2613 Searches binding levels from BINDING_LEVEL up to the global level.
2614 If THISLEVEL_ONLY is nonzero, searches only the specified context
2615 (but skips any tag-transparent contexts to find one that is
2616 meaningful for tags).
2617 CODE says which kind of type the caller wants;
2618 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2619 If the wrong kind of type is found, an error is reported. */
2622 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2623 enum tree_code code
;
2624 struct binding_level
*binding_level
;
2628 register struct binding_level
*level
;
2630 for (level
= binding_level
; level
; level
= level
->level_chain
)
2633 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2635 if (TREE_PURPOSE (tail
) == name
)
2637 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2639 /* Definition isn't the kind we were looking for. */
2640 pending_invalid_xref
= name
;
2641 pending_invalid_xref_file
= input_filename
;
2642 pending_invalid_xref_line
= lineno
;
2644 return TREE_VALUE (tail
);
2647 if (thislevel_only
&& ! level
->tag_transparent
)
2653 /* Print an error message now
2654 for a recent invalid struct, union or enum cross reference.
2655 We don't print them immediately because they are not invalid
2656 when used in the `struct foo;' construct for shadowing. */
2659 pending_xref_error ()
2661 if (pending_invalid_xref
!= 0)
2662 error_with_file_and_line (pending_invalid_xref_file
,
2663 pending_invalid_xref_line
,
2664 "`%s' defined as wrong kind of tag",
2665 IDENTIFIER_POINTER (pending_invalid_xref
));
2666 pending_invalid_xref
= 0;
2669 /* Given a type, find the tag that was defined for it and return the tag name.
2670 Otherwise return 0. */
2673 lookup_tag_reverse (type
)
2676 register struct binding_level
*level
;
2678 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2681 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2683 if (TREE_VALUE (tail
) == type
)
2684 return TREE_PURPOSE (tail
);
2690 /* Look up NAME in the current binding level and its superiors
2691 in the namespace of variables, functions and typedefs.
2692 Return a ..._DECL node of some kind representing its definition,
2693 or return 0 if it is undefined. */
2700 if (current_binding_level
!= global_binding_level
2701 && IDENTIFIER_LOCAL_VALUE (name
))
2702 val
= IDENTIFIER_LOCAL_VALUE (name
);
2704 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2708 /* Similar to `lookup_name' but look only at current binding level. */
2711 lookup_name_current_level (name
)
2716 if (current_binding_level
== global_binding_level
)
2717 return IDENTIFIER_GLOBAL_VALUE (name
);
2719 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2722 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2723 if (DECL_NAME (t
) == name
)
2729 /* Similar to `lookup_name_current_level' but also look at the global binding
2733 lookup_name_current_level_global (name
)
2736 register tree t
= 0;
2738 if (current_binding_level
== global_binding_level
)
2739 return IDENTIFIER_GLOBAL_VALUE (name
);
2741 if (IDENTIFIER_LOCAL_VALUE (name
) != 0)
2742 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2743 if (DECL_NAME (t
) == name
)
2747 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2752 /* Create the predefined scalar types of C,
2753 and some nodes representing standard constants (0, 1, (void *)0).
2754 Initialize the global binding level.
2755 Make definitions for built-in primitive functions. */
2758 init_decl_processing ()
2760 register tree endlink
;
2761 /* Either char* or void*. */
2762 tree traditional_ptr_type_node
;
2763 /* Data types of memcpy and strlen. */
2764 tree memcpy_ftype
, strlen_ftype
;
2765 tree void_ftype_any
;
2766 int wchar_type_size
;
2768 tree array_domain_type
;
2770 current_function_decl
= NULL
;
2771 named_labels
= NULL
;
2772 current_binding_level
= NULL_BINDING_LEVEL
;
2773 free_binding_level
= NULL_BINDING_LEVEL
;
2774 pushlevel (0); /* make the binding_level structure for global names */
2775 global_binding_level
= current_binding_level
;
2777 /* Define `int' and `char' first so that dbx will output them first. */
2779 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2780 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2781 integer_type_node
));
2783 /* Define `char', which is like either `signed char' or `unsigned char'
2784 but not the same as either. */
2788 ? make_signed_type (CHAR_TYPE_SIZE
)
2789 : make_unsigned_type (CHAR_TYPE_SIZE
));
2790 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2793 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2794 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2795 long_integer_type_node
));
2797 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2798 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2799 unsigned_type_node
));
2801 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
2802 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2803 long_unsigned_type_node
));
2805 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
2806 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2807 long_long_integer_type_node
));
2809 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
2810 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2811 long_long_unsigned_type_node
));
2813 /* `unsigned long' is the standard type for sizeof.
2814 Traditionally, use a signed type.
2815 Note that stddef.h uses `unsigned long',
2816 and this must agree, even of long and int are the same size. */
2818 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2819 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
2820 sizetype
= signed_type (sizetype
);
2823 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
2825 TREE_TYPE (TYPE_SIZE (integer_type_node
)) = sizetype
;
2826 TREE_TYPE (TYPE_SIZE (char_type_node
)) = sizetype
;
2827 TREE_TYPE (TYPE_SIZE (unsigned_type_node
)) = sizetype
;
2828 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node
)) = sizetype
;
2829 TREE_TYPE (TYPE_SIZE (long_integer_type_node
)) = sizetype
;
2830 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node
)) = sizetype
;
2831 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node
)) = sizetype
;
2833 error_mark_node
= make_node (ERROR_MARK
);
2834 TREE_TYPE (error_mark_node
) = error_mark_node
;
2836 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
2837 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2838 short_integer_type_node
));
2840 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
2841 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2842 short_unsigned_type_node
));
2844 /* Define both `signed char' and `unsigned char'. */
2845 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
2846 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2847 signed_char_type_node
));
2849 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
2850 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2851 unsigned_char_type_node
));
2853 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
2854 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2856 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
2857 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2859 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
2860 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2862 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
2863 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2865 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
2866 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2868 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
2869 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2871 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
2872 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2874 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
2875 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2877 float_type_node
= make_node (REAL_TYPE
);
2878 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
2879 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2881 layout_type (float_type_node
);
2883 double_type_node
= make_node (REAL_TYPE
);
2884 if (flag_short_double
)
2885 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
2887 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
2888 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2890 layout_type (double_type_node
);
2892 long_double_type_node
= make_node (REAL_TYPE
);
2893 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
2894 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2895 long_double_type_node
));
2896 layout_type (long_double_type_node
);
2898 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
2899 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2900 complex_integer_type_node
));
2901 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
2902 layout_type (complex_integer_type_node
);
2904 complex_float_type_node
= make_node (COMPLEX_TYPE
);
2905 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2906 complex_float_type_node
));
2907 TREE_TYPE (complex_float_type_node
) = float_type_node
;
2908 layout_type (complex_float_type_node
);
2910 complex_double_type_node
= make_node (COMPLEX_TYPE
);
2911 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2912 complex_double_type_node
));
2913 TREE_TYPE (complex_double_type_node
) = double_type_node
;
2914 layout_type (complex_double_type_node
);
2916 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
2917 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2918 complex_long_double_type_node
));
2919 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
2920 layout_type (complex_long_double_type_node
);
2923 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
2924 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
2925 signed_wchar_type_node
= signed_type (wchar_type_node
);
2926 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
2928 integer_zero_node
= build_int_2 (0, 0);
2929 TREE_TYPE (integer_zero_node
) = integer_type_node
;
2930 integer_one_node
= build_int_2 (1, 0);
2931 TREE_TYPE (integer_one_node
) = integer_type_node
;
2933 boolean_type_node
= integer_type_node
;
2934 boolean_true_node
= integer_one_node
;
2935 boolean_false_node
= integer_zero_node
;
2937 size_zero_node
= build_int_2 (0, 0);
2938 TREE_TYPE (size_zero_node
) = sizetype
;
2939 size_one_node
= build_int_2 (1, 0);
2940 TREE_TYPE (size_one_node
) = sizetype
;
2942 void_type_node
= make_node (VOID_TYPE
);
2943 pushdecl (build_decl (TYPE_DECL
,
2944 ridpointers
[(int) RID_VOID
], void_type_node
));
2945 layout_type (void_type_node
); /* Uses integer_zero_node */
2946 /* We are not going to have real types in C with less than byte alignment,
2947 so we might as well not have any types that claim to have it. */
2948 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
2950 null_pointer_node
= build_int_2 (0, 0);
2951 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
2952 layout_type (TREE_TYPE (null_pointer_node
));
2954 string_type_node
= build_pointer_type (char_type_node
);
2955 const_string_type_node
2956 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
2958 /* Make a type to be the domain of a few array types
2959 whose domains don't really matter.
2960 200 is small enough that it always fits in size_t
2961 and large enough that it can hold most function names for the
2962 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2963 array_domain_type
= build_index_type (build_int_2 (200, 0));
2965 /* make a type for arrays of characters.
2966 With luck nothing will ever really depend on the length of this
2968 char_array_type_node
2969 = build_array_type (char_type_node
, array_domain_type
);
2970 /* Likewise for arrays of ints. */
2972 = build_array_type (integer_type_node
, array_domain_type
);
2973 /* This is for wide string constants. */
2974 wchar_array_type_node
2975 = build_array_type (wchar_type_node
, array_domain_type
);
2977 default_function_type
2978 = build_function_type (integer_type_node
, NULL_TREE
);
2980 ptr_type_node
= build_pointer_type (void_type_node
);
2982 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
2984 endlink
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
2987 = build_function_type (void_type_node
, NULL_TREE
);
2990 = build_function_type (float_type_node
,
2991 tree_cons (NULL_TREE
, float_type_node
, endlink
));
2994 = build_function_type (double_type_node
,
2995 tree_cons (NULL_TREE
, double_type_node
, endlink
));
2997 ldouble_ftype_ldouble
2998 = build_function_type (long_double_type_node
,
2999 tree_cons (NULL_TREE
, long_double_type_node
,
3002 double_ftype_double_double
3003 = build_function_type (double_type_node
,
3004 tree_cons (NULL_TREE
, double_type_node
,
3005 tree_cons (NULL_TREE
,
3006 double_type_node
, endlink
)));
3009 = build_function_type (integer_type_node
,
3010 tree_cons (NULL_TREE
, integer_type_node
, endlink
));
3013 = build_function_type (long_integer_type_node
,
3014 tree_cons (NULL_TREE
,
3015 long_integer_type_node
, endlink
));
3017 void_ftype_ptr_ptr_int
3018 = build_function_type (void_type_node
,
3019 tree_cons (NULL_TREE
, ptr_type_node
,
3020 tree_cons (NULL_TREE
, ptr_type_node
,
3021 tree_cons (NULL_TREE
,
3025 int_ftype_cptr_cptr_sizet
3026 = build_function_type (integer_type_node
,
3027 tree_cons (NULL_TREE
, const_ptr_type_node
,
3028 tree_cons (NULL_TREE
, const_ptr_type_node
,
3029 tree_cons (NULL_TREE
,
3033 void_ftype_ptr_int_int
3034 = build_function_type (void_type_node
,
3035 tree_cons (NULL_TREE
, ptr_type_node
,
3036 tree_cons (NULL_TREE
, integer_type_node
,
3037 tree_cons (NULL_TREE
,
3041 string_ftype_ptr_ptr
/* strcpy prototype */
3042 = build_function_type (string_type_node
,
3043 tree_cons (NULL_TREE
, string_type_node
,
3044 tree_cons (NULL_TREE
,
3045 const_string_type_node
,
3048 int_ftype_string_string
/* strcmp prototype */
3049 = build_function_type (integer_type_node
,
3050 tree_cons (NULL_TREE
, const_string_type_node
,
3051 tree_cons (NULL_TREE
,
3052 const_string_type_node
,
3055 strlen_ftype
/* strlen prototype */
3056 = build_function_type (flag_traditional
? integer_type_node
: sizetype
,
3057 tree_cons (NULL_TREE
, const_string_type_node
,
3060 traditional_ptr_type_node
3061 = (flag_traditional
? string_type_node
: ptr_type_node
);
3063 memcpy_ftype
/* memcpy prototype */
3064 = build_function_type (traditional_ptr_type_node
,
3065 tree_cons (NULL_TREE
, ptr_type_node
,
3066 tree_cons (NULL_TREE
, const_ptr_type_node
,
3067 tree_cons (NULL_TREE
,
3071 builtin_function ("__builtin_constant_p", default_function_type
,
3072 BUILT_IN_CONSTANT_P
, NULL_PTR
);
3074 builtin_function ("__builtin_return_address",
3075 build_function_type (ptr_type_node
,
3076 tree_cons (NULL_TREE
,
3079 BUILT_IN_RETURN_ADDRESS
, NULL_PTR
);
3081 builtin_function ("__builtin_frame_address",
3082 build_function_type (ptr_type_node
,
3083 tree_cons (NULL_TREE
,
3086 BUILT_IN_FRAME_ADDRESS
, NULL_PTR
);
3088 builtin_function ("__builtin_alloca",
3089 build_function_type (ptr_type_node
,
3090 tree_cons (NULL_TREE
,
3093 BUILT_IN_ALLOCA
, "alloca");
3094 builtin_function ("__builtin_ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3095 /* Define alloca, ffs as builtins.
3096 Declare _exit just to mark it as volatile. */
3097 if (! flag_no_builtin
&& !flag_no_nonansi_builtin
)
3099 temp
= builtin_function ("alloca",
3100 build_function_type (ptr_type_node
,
3101 tree_cons (NULL_TREE
,
3104 BUILT_IN_ALLOCA
, NULL_PTR
);
3105 /* Suppress error if redefined as a non-function. */
3106 DECL_BUILT_IN_NONANSI (temp
) = 1;
3107 temp
= builtin_function ("ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3108 /* Suppress error if redefined as a non-function. */
3109 DECL_BUILT_IN_NONANSI (temp
) = 1;
3110 temp
= builtin_function ("_exit", void_ftype_any
, NOT_BUILT_IN
,
3112 TREE_THIS_VOLATILE (temp
) = 1;
3113 TREE_SIDE_EFFECTS (temp
) = 1;
3114 /* Suppress error if redefined as a non-function. */
3115 DECL_BUILT_IN_NONANSI (temp
) = 1;
3118 builtin_function ("__builtin_abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3119 builtin_function ("__builtin_fabsf", float_ftype_float
, BUILT_IN_FABS
,
3121 builtin_function ("__builtin_fabs", double_ftype_double
, BUILT_IN_FABS
,
3123 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3125 builtin_function ("__builtin_labs", long_ftype_long
, BUILT_IN_LABS
,
3127 builtin_function ("__builtin_saveregs",
3128 build_function_type (ptr_type_node
, NULL_TREE
),
3129 BUILT_IN_SAVEREGS
, NULL_PTR
);
3130 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3132 builtin_function ("__builtin_varargs",
3133 build_function_type (ptr_type_node
,
3134 tree_cons (NULL_TREE
,
3137 BUILT_IN_VARARGS
, NULL_PTR
);
3139 builtin_function ("__builtin_classify_type", default_function_type
,
3140 BUILT_IN_CLASSIFY_TYPE
, NULL_PTR
);
3141 builtin_function ("__builtin_next_arg",
3142 build_function_type (ptr_type_node
, NULL_TREE
),
3143 BUILT_IN_NEXT_ARG
, NULL_PTR
);
3144 builtin_function ("__builtin_args_info",
3145 build_function_type (integer_type_node
,
3146 tree_cons (NULL_TREE
,
3149 BUILT_IN_ARGS_INFO
, NULL_PTR
);
3151 /* Untyped call and return. */
3152 builtin_function ("__builtin_apply_args",
3153 build_function_type (ptr_type_node
, NULL_TREE
),
3154 BUILT_IN_APPLY_ARGS
, NULL_PTR
);
3156 temp
= tree_cons (NULL_TREE
,
3157 build_pointer_type (build_function_type (void_type_node
,
3159 tree_cons (NULL_TREE
,
3161 tree_cons (NULL_TREE
,
3164 builtin_function ("__builtin_apply",
3165 build_function_type (ptr_type_node
, temp
),
3166 BUILT_IN_APPLY
, NULL_PTR
);
3167 builtin_function ("__builtin_return",
3168 build_function_type (void_type_node
,
3169 tree_cons (NULL_TREE
,
3172 BUILT_IN_RETURN
, NULL_PTR
);
3174 /* Currently under experimentation. */
3175 builtin_function ("__builtin_memcpy", memcpy_ftype
,
3176 BUILT_IN_MEMCPY
, "memcpy");
3177 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet
,
3178 BUILT_IN_MEMCMP
, "memcmp");
3179 builtin_function ("__builtin_strcmp", int_ftype_string_string
,
3180 BUILT_IN_STRCMP
, "strcmp");
3181 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr
,
3182 BUILT_IN_STRCPY
, "strcpy");
3183 builtin_function ("__builtin_strlen", strlen_ftype
,
3184 BUILT_IN_STRLEN
, "strlen");
3185 builtin_function ("__builtin_sqrtf", float_ftype_float
,
3186 BUILT_IN_FSQRT
, "sqrtf");
3187 builtin_function ("__builtin_fsqrt", double_ftype_double
,
3188 BUILT_IN_FSQRT
, "sqrt");
3189 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble
,
3190 BUILT_IN_FSQRT
, "sqrtl");
3191 builtin_function ("__builtin_sinf", float_ftype_float
,
3192 BUILT_IN_SIN
, "sinf");
3193 builtin_function ("__builtin_sin", double_ftype_double
,
3194 BUILT_IN_SIN
, "sin");
3195 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble
,
3196 BUILT_IN_SIN
, "sinl");
3197 builtin_function ("__builtin_cosf", float_ftype_float
,
3198 BUILT_IN_COS
, "cosf");
3199 builtin_function ("__builtin_cos", double_ftype_double
,
3200 BUILT_IN_COS
, "cos");
3201 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble
,
3202 BUILT_IN_COS
, "cosl");
3204 /* In an ANSI C program, it is okay to supply built-in meanings
3205 for these functions, since applications cannot validly use them
3206 with any other meaning.
3207 However, honor the -fno-builtin option. */
3208 if (!flag_no_builtin
)
3210 builtin_function ("abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3211 builtin_function ("fabsf", float_ftype_float
, BUILT_IN_FABS
, NULL_PTR
);
3212 builtin_function ("fabs", double_ftype_double
, BUILT_IN_FABS
, NULL_PTR
);
3213 builtin_function ("fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3215 builtin_function ("labs", long_ftype_long
, BUILT_IN_LABS
, NULL_PTR
);
3216 builtin_function ("memcpy", memcpy_ftype
, BUILT_IN_MEMCPY
, NULL_PTR
);
3217 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet
, BUILT_IN_MEMCMP
,
3219 builtin_function ("strcmp", int_ftype_string_string
, BUILT_IN_STRCMP
,
3221 builtin_function ("strcpy", string_ftype_ptr_ptr
, BUILT_IN_STRCPY
,
3223 builtin_function ("strlen", strlen_ftype
, BUILT_IN_STRLEN
, NULL_PTR
);
3224 builtin_function ("sqrtf", float_ftype_float
, BUILT_IN_FSQRT
, NULL_PTR
);
3225 builtin_function ("sqrt", double_ftype_double
, BUILT_IN_FSQRT
, NULL_PTR
);
3226 builtin_function ("sqrtl", ldouble_ftype_ldouble
, BUILT_IN_FSQRT
,
3228 builtin_function ("sinf", float_ftype_float
, BUILT_IN_SIN
, NULL_PTR
);
3229 builtin_function ("sin", double_ftype_double
, BUILT_IN_SIN
, NULL_PTR
);
3230 builtin_function ("sinl", ldouble_ftype_ldouble
, BUILT_IN_SIN
, NULL_PTR
);
3231 builtin_function ("cosf", float_ftype_float
, BUILT_IN_COS
, NULL_PTR
);
3232 builtin_function ("cos", double_ftype_double
, BUILT_IN_COS
, NULL_PTR
);
3233 builtin_function ("cosl", ldouble_ftype_ldouble
, BUILT_IN_COS
, NULL_PTR
);
3235 /* Declare these functions volatile
3236 to avoid spurious "control drops through" warnings. */
3237 /* Don't specify the argument types, to avoid errors
3238 from certain code which isn't valid in ANSI but which exists. */
3239 temp
= builtin_function ("abort", void_ftype_any
, NOT_BUILT_IN
,
3241 TREE_THIS_VOLATILE (temp
) = 1;
3242 TREE_SIDE_EFFECTS (temp
) = 1;
3243 temp
= builtin_function ("exit", void_ftype_any
, NOT_BUILT_IN
, NULL_PTR
);
3244 TREE_THIS_VOLATILE (temp
) = 1;
3245 TREE_SIDE_EFFECTS (temp
) = 1;
3249 /* Support for these has not been written in either expand_builtin
3250 or build_function_call. */
3251 builtin_function ("__builtin_div", default_ftype
, BUILT_IN_DIV
, NULL_PTR
);
3252 builtin_function ("__builtin_ldiv", default_ftype
, BUILT_IN_LDIV
, NULL_PTR
);
3253 builtin_function ("__builtin_ffloor", double_ftype_double
, BUILT_IN_FFLOOR
,
3255 builtin_function ("__builtin_fceil", double_ftype_double
, BUILT_IN_FCEIL
,
3257 builtin_function ("__builtin_fmod", double_ftype_double_double
,
3258 BUILT_IN_FMOD
, NULL_PTR
);
3259 builtin_function ("__builtin_frem", double_ftype_double_double
,
3260 BUILT_IN_FREM
, NULL_PTR
);
3261 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int
,
3262 BUILT_IN_MEMSET
, NULL_PTR
);
3263 builtin_function ("__builtin_getexp", double_ftype_double
, BUILT_IN_GETEXP
,
3265 builtin_function ("__builtin_getman", double_ftype_double
, BUILT_IN_GETMAN
,
3269 pedantic_lvalues
= pedantic
;
3271 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3272 declare_function_name ();
3274 start_identifier_warnings ();
3276 /* Prepare to check format strings against argument lists. */
3277 init_function_format_info ();
3281 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3284 /* Return a definition for a builtin function named NAME and whose data type
3285 is TYPE. TYPE should be a function type with argument types.
3286 FUNCTION_CODE tells later passes how to compile calls to this function.
3287 See tree.h for its possible values.
3289 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3290 the name to be called if we can't opencode the function. */
3293 builtin_function (name
, type
, function_code
, library_name
)
3296 enum built_in_function function_code
;
3299 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3300 DECL_EXTERNAL (decl
) = 1;
3301 TREE_PUBLIC (decl
) = 1;
3302 /* If -traditional, permit redefining a builtin function any way you like.
3303 (Though really, if the program redefines these functions,
3304 it probably won't work right unless compiled with -fno-builtin.) */
3305 if (flag_traditional
&& name
[0] != '_')
3306 DECL_BUILT_IN_NONANSI (decl
) = 1;
3308 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3309 make_decl_rtl (decl
, NULL_PTR
, 1);
3311 if (function_code
!= NOT_BUILT_IN
)
3313 DECL_BUILT_IN (decl
) = 1;
3314 DECL_FUNCTION_CODE (decl
) = function_code
;
3316 /* Warn if a function in the namespace for users
3317 is used without an occasion to consider it declared. */
3318 if (name
[0] != '_' || name
[1] != '_')
3319 C_DECL_ANTICIPATED (decl
) = 1;
3324 /* Called when a declaration is seen that contains no names to declare.
3325 If its type is a reference to a structure, union or enum inherited
3326 from a containing scope, shadow that tag name for the current scope
3327 with a forward reference.
3328 If its type defines a new named structure or union
3329 or defines an enum, it is valid but we need not do anything here.
3330 Otherwise, it is an error. */
3333 shadow_tag (declspecs
)
3336 shadow_tag_warned (declspecs
, 0);
3340 shadow_tag_warned (declspecs
, warned
)
3343 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3349 pending_invalid_xref
= 0;
3351 for (link
= declspecs
; link
; link
= TREE_CHAIN (link
))
3353 register tree value
= TREE_VALUE (link
);
3354 register enum tree_code code
= TREE_CODE (value
);
3356 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3357 /* Used to test also that TYPE_SIZE (value) != 0.
3358 That caused warning for `struct foo;' at top level in the file. */
3360 register tree name
= lookup_tag_reverse (value
);
3367 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3368 /* Empty unnamed enum OK */
3370 pedwarn ("unnamed struct/union that defines no instances");
3376 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3380 t
= make_node (code
);
3389 warning ("useless keyword or type name in empty declaration");
3396 error ("two types specified in one empty declaration");
3401 pedwarn ("empty declaration");
3405 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3408 groktypename (typename
)
3411 if (TREE_CODE (typename
) != TREE_LIST
)
3413 return grokdeclarator (TREE_VALUE (typename
),
3414 TREE_PURPOSE (typename
),
3418 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3421 groktypename_in_parm_context (typename
)
3424 if (TREE_CODE (typename
) != TREE_LIST
)
3426 return grokdeclarator (TREE_VALUE (typename
),
3427 TREE_PURPOSE (typename
),
3431 /* Decode a declarator in an ordinary declaration or data definition.
3432 This is called as soon as the type information and variable name
3433 have been parsed, before parsing the initializer if any.
3434 Here we create the ..._DECL node, fill in its type,
3435 and put it on the list of decls for the current context.
3436 The ..._DECL node is returned as the value.
3438 Exception: for arrays where the length is not specified,
3439 the type is left null, to be filled in by `finish_decl'.
3441 Function definitions do not come here; they go to start_function
3442 instead. However, external and forward declarations of functions
3443 do go through here. Structure field declarations are done by
3444 grokfield and not through here. */
3446 /* Set this to zero to debug not using the temporary obstack
3447 to parse initializers. */
3448 int debug_temp_inits
= 1;
3451 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3452 tree declarator
, declspecs
;
3454 tree attributes
, prefix_attributes
;
3456 register tree decl
= grokdeclarator (declarator
, declspecs
,
3457 NORMAL
, initialized
);
3459 int init_written
= initialized
;
3461 /* The corresponding pop_obstacks is in finish_decl. */
3462 push_obstacks_nochange ();
3465 /* Is it valid for this decl to have an initializer at all?
3466 If not, set INITIALIZED to zero, which will indirectly
3467 tell `finish_decl' to ignore the initializer once it is parsed. */
3468 switch (TREE_CODE (decl
))
3471 /* typedef foo = bar means give foo the same type as bar.
3472 We haven't parsed bar yet, so `finish_decl' will fix that up.
3473 Any other case of an initialization in a TYPE_DECL is an error. */
3474 if (pedantic
|| list_length (declspecs
) > 1)
3476 error ("typedef `%s' is initialized",
3477 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3483 error ("function `%s' is initialized like a variable",
3484 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3489 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3490 error ("parameter `%s' is initialized",
3491 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3496 /* Don't allow initializations for incomplete types
3497 except for arrays which might be completed by the initialization. */
3498 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3500 /* A complete type is ok if size is fixed. */
3502 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3503 || C_DECL_VARIABLE_SIZE (decl
))
3505 error ("variable-sized object may not be initialized");
3509 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3511 error ("variable `%s' has initializer but incomplete type",
3512 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3515 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3517 error ("elements of array `%s' have incomplete type",
3518 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3525 #if 0 /* Seems redundant with grokdeclarator. */
3526 if (current_binding_level
!= global_binding_level
3527 && DECL_EXTERNAL (decl
)
3528 && TREE_CODE (decl
) != FUNCTION_DECL
)
3529 warning ("declaration of `%s' has `extern' and is initialized",
3530 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3532 DECL_EXTERNAL (decl
) = 0;
3533 if (current_binding_level
== global_binding_level
)
3534 TREE_STATIC (decl
) = 1;
3536 /* Tell `pushdecl' this is an initialized decl
3537 even though we don't yet have the initializer expression.
3538 Also tell `finish_decl' it may store the real initializer. */
3539 DECL_INITIAL (decl
) = error_mark_node
;
3542 /* If this is a function declaration, write a record describing it to the
3543 prototypes file (if requested). */
3545 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3546 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3548 /* Set attributes here so if duplicate decl, will have proper attributes. */
3549 decl_attributes (decl
, attributes
, prefix_attributes
);
3551 /* Add this decl to the current binding level.
3552 TEM may equal DECL or it may be a previous decl of the same name. */
3553 tem
= pushdecl (decl
);
3555 /* For C and Obective-C, we by default put things in .common when
3557 DECL_COMMON (tem
) = 1;
3559 /* For a local variable, define the RTL now. */
3560 if (current_binding_level
!= global_binding_level
3561 /* But not if this is a duplicate decl
3562 and we preserved the rtl from the previous one
3563 (which may or may not happen). */
3564 && DECL_RTL (tem
) == 0)
3566 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3568 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3569 && DECL_INITIAL (tem
) != 0)
3575 /* When parsing and digesting the initializer,
3576 use temporary storage. Do this even if we will ignore the value. */
3577 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3578 temporary_allocation ();
3584 /* Finish processing of a declaration;
3585 install its initial value.
3586 If the length of an array type is not known before,
3587 it must be determined now, from the initial value, or it is an error. */
3590 finish_decl (decl
, init
, asmspec_tree
)
3594 register tree type
= TREE_TYPE (decl
);
3595 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3596 int temporary
= allocation_temporary_p ();
3599 /* If a name was specified, get the string. */
3601 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3603 /* If `start_decl' didn't like having an initialization, ignore it now. */
3605 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3607 /* Don't crash if parm is initialized. */
3608 if (TREE_CODE (decl
) == PARM_DECL
)
3611 if (ITERATOR_P (decl
))
3614 error_with_decl (decl
, "iterator has no initial value");
3616 init
= save_expr (init
);
3621 if (TREE_CODE (decl
) != TYPE_DECL
)
3622 store_init_value (decl
, init
);
3625 /* typedef foo = bar; store the type of bar as the type of foo. */
3626 TREE_TYPE (decl
) = TREE_TYPE (init
);
3627 DECL_INITIAL (decl
) = init
= 0;
3631 /* Pop back to the obstack that is current for this binding level.
3632 This is because MAXINDEX, rtl, etc. to be made below
3633 must go in the permanent obstack. But don't discard the
3634 temporary data yet. */
3636 #if 0 /* pop_obstacks was near the end; this is what was here. */
3637 if (current_binding_level
== global_binding_level
&& temporary
)
3638 end_temporary_allocation ();
3641 /* Deduce size of array from initialization, if not already known */
3643 if (TREE_CODE (type
) == ARRAY_TYPE
3644 && TYPE_DOMAIN (type
) == 0
3645 && TREE_CODE (decl
) != TYPE_DECL
)
3648 = (TREE_STATIC (decl
)
3649 /* Even if pedantic, an external linkage array
3650 may have incomplete type at first. */
3651 ? pedantic
&& !TREE_PUBLIC (decl
)
3652 : !DECL_EXTERNAL (decl
));
3654 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3656 /* Get the completed type made by complete_array_type. */
3657 type
= TREE_TYPE (decl
);
3660 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3665 error_with_decl (decl
, "array size missing in `%s'");
3666 /* If a `static' var's size isn't known,
3667 make it extern as well as static, so it does not get
3669 If it is not `static', then do not mark extern;
3670 finish_incomplete_decl will give it a default size
3671 and it will get allocated. */
3672 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3673 DECL_EXTERNAL (decl
) = 1;
3676 /* TYPE_MAX_VALUE is always one less than the number of elements
3677 in the array, because we start counting at zero. Therefore,
3678 warn only if the value is less than zero. */
3679 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3680 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3681 error_with_decl (decl
, "zero or negative size array `%s'");
3683 layout_decl (decl
, 0);
3686 if (TREE_CODE (decl
) == VAR_DECL
)
3688 if (DECL_SIZE (decl
) == 0
3689 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3690 layout_decl (decl
, 0);
3692 if (DECL_SIZE (decl
) == 0
3693 && (TREE_STATIC (decl
)
3695 /* A static variable with an incomplete type
3696 is an error if it is initialized.
3697 Also if it is not file scope.
3698 Otherwise, let it through, but if it is not `extern'
3699 then it may cause an error message later. */
3700 /* We must use DECL_CONTEXT instead of current_binding_level,
3701 because a duplicate_decls call could have changed the binding
3702 level of this decl. */
3703 (DECL_INITIAL (decl
) != 0 || DECL_CONTEXT (decl
) != 0)
3705 /* An automatic variable with an incomplete type
3707 !DECL_EXTERNAL (decl
)))
3709 error_with_decl (decl
, "storage size of `%s' isn't known");
3710 TREE_TYPE (decl
) = error_mark_node
;
3713 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3714 && DECL_SIZE (decl
) != 0)
3716 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3717 constant_expression_warning (DECL_SIZE (decl
));
3719 error_with_decl (decl
, "storage size of `%s' isn't constant");
3723 /* If this is a function and an assembler name is specified, it isn't
3724 builtin any more. Also reset DECL_RTL so we can give it its new
3726 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3728 DECL_BUILT_IN (decl
) = 0;
3729 DECL_RTL (decl
) = 0;
3732 /* Output the assembler code and/or RTL code for variables and functions,
3733 unless the type is an undefined structure or union.
3734 If not, it will get done when the type is completed. */
3736 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3738 if ((flag_traditional
|| TREE_PERMANENT (decl
))
3739 && allocation_temporary_p ())
3741 push_obstacks_nochange ();
3742 end_temporary_allocation ();
3743 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3744 maybe_objc_check_decl (decl
);
3745 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3751 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3752 maybe_objc_check_decl (decl
);
3753 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3756 if (DECL_CONTEXT (decl
) != 0)
3758 /* Recompute the RTL of a local array now
3759 if it used to be an incomplete type. */
3761 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3763 /* If we used it already as memory, it must stay in memory. */
3764 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3765 /* If it's still incomplete now, no init will save it. */
3766 if (DECL_SIZE (decl
) == 0)
3767 DECL_INITIAL (decl
) = 0;
3770 /* Compute and store the initial value. */
3771 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3772 expand_decl_init (decl
);
3776 if (TREE_CODE (decl
) == TYPE_DECL
)
3778 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3779 maybe_objc_check_decl (decl
);
3780 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0,
3784 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3785 /* This test used to include TREE_PERMANENT, however, we have the same
3786 problem with initializers at the function level. Such initializers get
3787 saved until the end of the function on the momentary_obstack. */
3788 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
3790 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3791 space with DECL_ARG_TYPE. */
3792 && TREE_CODE (decl
) != PARM_DECL
)
3794 /* We need to remember that this array HAD an initialization,
3795 but discard the actual temporary nodes,
3796 since we can't have a permanent node keep pointing to them. */
3797 /* We make an exception for inline functions, since it's
3798 normal for a local extern redeclaration of an inline function
3799 to have a copy of the top-level decl's DECL_INLINE. */
3800 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
3802 /* If this is a const variable, then preserve the
3803 initializer instead of discarding it so that we can optimize
3804 references to it. */
3805 /* This test used to include TREE_STATIC, but this won't be set
3806 for function level initializers. */
3807 if (TREE_READONLY (decl
) || ITERATOR_P (decl
))
3809 preserve_initializer ();
3810 /* Hack? Set the permanent bit for something that is permanent,
3811 but not on the permenent obstack, so as to convince
3812 output_constant_def to make its rtl on the permanent
3814 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
3816 /* The initializer and DECL must have the same (or equivalent
3817 types), but if the initializer is a STRING_CST, its type
3818 might not be on the right obstack, so copy the type
3820 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3823 DECL_INITIAL (decl
) = error_mark_node
;
3827 /* If requested, warn about definitions of large data objects. */
3829 if (warn_larger_than
3830 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
3831 && !DECL_EXTERNAL (decl
))
3833 register tree decl_size
= DECL_SIZE (decl
);
3835 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
3837 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
3839 if (units
> larger_than_size
)
3840 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
3845 /* Resume permanent allocation, if not within a function. */
3846 /* The corresponding push_obstacks_nochange is in start_decl,
3847 and in push_parm_decl and in grokfield. */
3851 /* If we have gone back from temporary to permanent allocation,
3852 actually free the temporary space that we no longer need. */
3853 if (temporary
&& !allocation_temporary_p ())
3854 permanent_allocation (0);
3856 /* At the end of a declaration, throw away any variable type sizes
3857 of types defined inside that declaration. There is no use
3858 computing them in the following function definition. */
3859 if (current_binding_level
== global_binding_level
)
3860 get_pending_sizes ();
3863 /* If DECL has a cleanup, build and return that cleanup here.
3864 This is a callback called by expand_expr. */
3867 maybe_build_cleanup (decl
)
3870 /* There are no cleanups in C. */
3874 /* Given a parsed parameter declaration,
3875 decode it into a PARM_DECL and push that on the current binding level.
3876 Also, for the sake of forward parm decls,
3877 record the given order of parms in `parm_order'. */
3880 push_parm_decl (parm
)
3884 int old_immediate_size_expand
= immediate_size_expand
;
3885 /* Don't try computing parm sizes now -- wait till fn is called. */
3886 immediate_size_expand
= 0;
3888 /* The corresponding pop_obstacks is in finish_decl. */
3889 push_obstacks_nochange ();
3891 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3892 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3893 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3894 TREE_PURPOSE (TREE_VALUE (parm
)));
3897 if (DECL_NAME (decl
))
3900 olddecl
= lookup_name (DECL_NAME (decl
));
3901 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3902 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3906 decl
= pushdecl (decl
);
3908 immediate_size_expand
= old_immediate_size_expand
;
3910 current_binding_level
->parm_order
3911 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3913 /* Add this decl to the current binding level. */
3914 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3917 /* Clear the given order of parms in `parm_order'.
3918 Used at start of parm list,
3919 and also at semicolon terminating forward decls. */
3924 current_binding_level
->parm_order
= NULL_TREE
;
3927 /* Make TYPE a complete type based on INITIAL_VALUE.
3928 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3929 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3932 complete_array_type (type
, initial_value
, do_default
)
3937 register tree maxindex
= NULL_TREE
;
3942 /* Note MAXINDEX is really the maximum index,
3943 one less than the size. */
3944 if (TREE_CODE (initial_value
) == STRING_CST
)
3947 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3948 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3951 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3953 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3954 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
3955 for (; elts
; elts
= TREE_CHAIN (elts
))
3957 if (TREE_PURPOSE (elts
))
3958 maxindex
= TREE_PURPOSE (elts
);
3960 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
3962 maxindex
= copy_node (maxindex
);
3966 /* Make an error message unless that happened already. */
3967 if (initial_value
!= error_mark_node
)
3970 /* Prevent further error messages. */
3971 maxindex
= build_int_2 (0, 0);
3978 maxindex
= build_int_2 (0, 0);
3984 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3985 if (!TREE_TYPE (maxindex
))
3986 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3987 #if 0 /* I took out this change
3988 together with the change in build_array_type. --rms */
3989 change_main_variant (type
,
3990 build_array_type (TREE_TYPE (type
),
3991 TYPE_DOMAIN (type
)));
3995 /* Lay out the type now that we can get the real answer. */
4002 /* Given declspecs and a declarator,
4003 determine the name and type of the object declared
4004 and construct a ..._DECL node for it.
4005 (In one case we can return a ..._TYPE node instead.
4006 For invalid input we sometimes return 0.)
4008 DECLSPECS is a chain of tree_list nodes whose value fields
4009 are the storage classes and type specifiers.
4011 DECL_CONTEXT says which syntactic context this declaration is in:
4012 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4013 FUNCDEF for a function definition. Like NORMAL but a few different
4014 error messages in each case. Return value may be zero meaning
4015 this definition is too screwy to try to parse.
4016 PARM for a parameter declaration (either within a function prototype
4017 or before a function body). Make a PARM_DECL, or return void_type_node.
4018 TYPENAME if for a typename (in a cast or sizeof).
4019 Don't make a DECL node; just return the ..._TYPE node.
4020 FIELD for a struct or union field; make a FIELD_DECL.
4021 BITFIELD for a field with specified width.
4022 INITIALIZED is 1 if the decl has an initializer.
4024 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4025 It may also be so in the PARM case, for a prototype where the
4026 argument type is specified but not the name.
4028 This function is where the complicated C meanings of `static'
4029 and `extern' are interpreted. */
4032 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4035 enum decl_context decl_context
;
4040 tree type
= NULL_TREE
;
4045 int explicit_int
= 0;
4046 int explicit_char
= 0;
4047 int defaulted_int
= 0;
4048 tree typedef_decl
= 0;
4050 tree typedef_type
= 0;
4051 int funcdef_flag
= 0;
4052 enum tree_code innermost_code
= ERROR_MARK
;
4054 int size_varies
= 0;
4055 tree decl_machine_attr
= NULL_TREE
;
4057 if (decl_context
== BITFIELD
)
4058 bitfield
= 1, decl_context
= FIELD
;
4060 if (decl_context
== FUNCDEF
)
4061 funcdef_flag
= 1, decl_context
= NORMAL
;
4063 push_obstacks_nochange ();
4065 if (flag_traditional
&& allocation_temporary_p ())
4066 end_temporary_allocation ();
4068 /* Look inside a declarator for the name being declared
4069 and get it as a string, for an error message. */
4071 register tree decl
= declarator
;
4075 switch (TREE_CODE (decl
))
4080 innermost_code
= TREE_CODE (decl
);
4081 decl
= TREE_OPERAND (decl
, 0);
4084 case IDENTIFIER_NODE
:
4085 name
= IDENTIFIER_POINTER (decl
);
4096 /* A function definition's declarator must have the form of
4097 a function declarator. */
4099 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4102 /* Anything declared one level down from the top level
4103 must be one of the parameters of a function
4104 (because the body is at least two levels down). */
4106 /* If this looks like a function definition, make it one,
4107 even if it occurs where parms are expected.
4108 Then store_parm_decls will reject it and not use it as a parm. */
4109 if (decl_context
== NORMAL
&& !funcdef_flag
4110 && current_binding_level
->parm_flag
)
4111 decl_context
= PARM
;
4113 /* Look through the decl specs and record which ones appear.
4114 Some typespecs are defined as built-in typenames.
4115 Others, the ones that are modifiers of other types,
4116 are represented by bits in SPECBITS: set the bits for
4117 the modifiers that appear. Storage class keywords are also in SPECBITS.
4119 If there is a typedef name or a type, store the type in TYPE.
4120 This includes builtin typedefs such as `int'.
4122 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4123 and did not come from a user typedef.
4125 Set LONGLONG if `long' is mentioned twice. */
4127 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4130 register tree id
= TREE_VALUE (spec
);
4132 if (id
== ridpointers
[(int) RID_INT
])
4134 if (id
== ridpointers
[(int) RID_CHAR
])
4137 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4138 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
4140 if (ridpointers
[i
] == id
)
4142 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
4145 error ("`long long long' is too long for GCC");
4148 if (pedantic
&& ! in_system_header
)
4149 pedwarn ("ANSI C does not support `long long'");
4153 else if (specbits
& (1 << i
))
4154 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4160 error ("two or more data types in declaration of `%s'", name
);
4161 /* Actual typedefs come to us as TYPE_DECL nodes. */
4162 else if (TREE_CODE (id
) == TYPE_DECL
)
4164 type
= TREE_TYPE (id
);
4165 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4168 /* Built-in types come as identifiers. */
4169 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4171 register tree t
= lookup_name (id
);
4172 if (TREE_TYPE (t
) == error_mark_node
)
4174 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4175 error ("`%s' fails to be a typedef or built in type",
4176 IDENTIFIER_POINTER (id
));
4179 type
= TREE_TYPE (t
);
4183 else if (TREE_CODE (id
) != ERROR_MARK
)
4189 typedef_type
= type
;
4191 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4193 /* No type at all: default to `int', and set DEFAULTED_INT
4194 because it was not a user-defined typedef. */
4198 if (funcdef_flag
&& warn_return_type
4199 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4200 | (1 << (int) RID_SIGNED
) | (1 << (int) RID_UNSIGNED
))))
4201 warn_about_return_type
= 1;
4203 type
= integer_type_node
;
4206 /* Now process the modifiers that were specified
4207 and check for invalid combinations. */
4209 /* Long double is a special combination. */
4211 if ((specbits
& 1 << (int) RID_LONG
)
4212 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4214 specbits
&= ~ (1 << (int) RID_LONG
);
4215 type
= long_double_type_node
;
4218 /* Check all other uses of type modifiers. */
4220 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4221 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4225 if (TREE_CODE (type
) != INTEGER_TYPE
)
4226 error ("long, short, signed or unsigned invalid for `%s'", name
);
4227 else if ((specbits
& 1 << (int) RID_LONG
)
4228 && (specbits
& 1 << (int) RID_SHORT
))
4229 error ("long and short specified together for `%s'", name
);
4230 else if (((specbits
& 1 << (int) RID_LONG
)
4231 || (specbits
& 1 << (int) RID_SHORT
))
4233 error ("long or short specified with char for `%s'", name
);
4234 else if (((specbits
& 1 << (int) RID_LONG
)
4235 || (specbits
& 1 << (int) RID_SHORT
))
4236 && TREE_CODE (type
) == REAL_TYPE
)
4237 error ("long or short specified with floating type for `%s'", name
);
4238 else if ((specbits
& 1 << (int) RID_SIGNED
)
4239 && (specbits
& 1 << (int) RID_UNSIGNED
))
4240 error ("signed and unsigned given together for `%s'", name
);
4244 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4246 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4248 if (flag_pedantic_errors
)
4253 /* Discard the type modifiers if they are invalid. */
4256 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4257 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4262 if ((specbits
& (1 << (int) RID_COMPLEX
))
4263 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4265 error ("complex invalid for `%s'", name
);
4266 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4269 /* Decide whether an integer type is signed or not.
4270 Optionally treat bitfields as signed by default. */
4271 if (specbits
& 1 << (int) RID_UNSIGNED
4272 /* Traditionally, all bitfields are unsigned. */
4273 || (bitfield
&& flag_traditional
4274 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4275 || (bitfield
&& ! flag_signed_bitfields
4276 && (explicit_int
|| defaulted_int
|| explicit_char
4277 /* A typedef for plain `int' without `signed'
4278 can be controlled just like plain `int'. */
4279 || ! (typedef_decl
!= 0
4280 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4281 && TREE_CODE (type
) != ENUMERAL_TYPE
4282 && !(specbits
& 1 << (int) RID_SIGNED
)))
4285 type
= long_long_unsigned_type_node
;
4286 else if (specbits
& 1 << (int) RID_LONG
)
4287 type
= long_unsigned_type_node
;
4288 else if (specbits
& 1 << (int) RID_SHORT
)
4289 type
= short_unsigned_type_node
;
4290 else if (type
== char_type_node
)
4291 type
= unsigned_char_type_node
;
4292 else if (typedef_decl
)
4293 type
= unsigned_type (type
);
4295 type
= unsigned_type_node
;
4297 else if ((specbits
& 1 << (int) RID_SIGNED
)
4298 && type
== char_type_node
)
4299 type
= signed_char_type_node
;
4301 type
= long_long_integer_type_node
;
4302 else if (specbits
& 1 << (int) RID_LONG
)
4303 type
= long_integer_type_node
;
4304 else if (specbits
& 1 << (int) RID_SHORT
)
4305 type
= short_integer_type_node
;
4307 if (specbits
& 1 << (int) RID_COMPLEX
)
4309 /* If we just have "complex", it is equivalent to
4310 "complex double", but if any modifiers at all are specified it is
4311 the complex form of TYPE. E.g, "complex short" is
4312 "complex short int". */
4314 if (defaulted_int
&& ! longlong
4315 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4316 | (1 << (int) RID_SIGNED
)
4317 | (1 << (int) RID_UNSIGNED
))))
4318 type
= complex_double_type_node
;
4319 else if (type
== integer_type_node
)
4320 type
= complex_integer_type_node
;
4321 else if (type
== float_type_node
)
4322 type
= complex_float_type_node
;
4323 else if (type
== double_type_node
)
4324 type
= complex_double_type_node
;
4325 else if (type
== long_double_type_node
)
4326 type
= complex_long_double_type_node
;
4328 type
= build_complex_type (type
);
4331 /* Set CONSTP if this declaration is `const', whether by
4332 explicit specification or via a typedef.
4333 Likewise for VOLATILEP. */
4335 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4336 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4337 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4339 pedwarn ("duplicate `const'");
4341 pedwarn ("duplicate `volatile'");
4342 if (! flag_gen_aux_info
&& (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)))
4343 type
= TYPE_MAIN_VARIANT (type
);
4345 /* Warn if two storage classes are given. Default to `auto'. */
4350 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4351 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4352 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4353 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4354 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4355 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4357 /* Warn about storage classes that are invalid for certain
4358 kinds of declarations (parameters, typenames, etc.). */
4361 error ("multiple storage classes in declaration of `%s'", name
);
4362 else if (funcdef_flag
4364 & ((1 << (int) RID_REGISTER
)
4365 | (1 << (int) RID_AUTO
)
4366 | (1 << (int) RID_TYPEDEF
))))
4368 if (specbits
& 1 << (int) RID_AUTO
4369 && (pedantic
|| current_binding_level
== global_binding_level
))
4370 pedwarn ("function definition declared `auto'");
4371 if (specbits
& 1 << (int) RID_REGISTER
)
4372 error ("function definition declared `register'");
4373 if (specbits
& 1 << (int) RID_TYPEDEF
)
4374 error ("function definition declared `typedef'");
4375 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4376 | (1 << (int) RID_AUTO
));
4378 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4380 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4384 error ((decl_context
== FIELD
4385 ? "storage class specified for structure field `%s'"
4386 : (decl_context
== PARM
4387 ? "storage class specified for parameter `%s'"
4388 : "storage class specified for typename")),
4390 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4391 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4392 | (1 << (int) RID_EXTERN
));
4395 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4397 /* `extern' with initialization is invalid if not at top level. */
4398 if (current_binding_level
== global_binding_level
)
4399 warning ("`%s' initialized and declared `extern'", name
);
4401 error ("`%s' has both `extern' and initializer", name
);
4403 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4404 && current_binding_level
!= global_binding_level
)
4405 error ("nested function `%s' declared `extern'", name
);
4406 else if (current_binding_level
== global_binding_level
4407 && specbits
& (1 << (int) RID_AUTO
))
4408 error ("top-level declaration of `%s' specifies `auto'", name
);
4409 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4410 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4412 error ("iterator `%s' has derived type", name
);
4413 type
= error_mark_node
;
4415 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4416 && TREE_CODE (type
) != INTEGER_TYPE
)
4418 error ("iterator `%s' has noninteger type", name
);
4419 type
= error_mark_node
;
4423 /* Now figure out the structure of the declarator proper.
4424 Descend through it, creating more complex types, until we reach
4425 the declared identifier (or NULL_TREE, in an absolute declarator). */
4427 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4429 if (type
== error_mark_node
)
4431 declarator
= TREE_OPERAND (declarator
, 0);
4435 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4436 an INDIRECT_REF (for *...),
4437 a CALL_EXPR (for ...(...)),
4438 an identifier (for the name being declared)
4439 or a null pointer (for the place in an absolute declarator
4440 where the name was omitted).
4441 For the last two cases, we have just exited the loop.
4443 At this point, TYPE is the type of elements of an array,
4444 or for a function to return, or for a pointer to point to.
4445 After this sequence of ifs, TYPE is the type of the
4446 array or function or pointer, and DECLARATOR has had its
4447 outermost layer removed. */
4449 if (TREE_CODE (declarator
) == ARRAY_REF
)
4451 register tree itype
= NULL_TREE
;
4452 register tree size
= TREE_OPERAND (declarator
, 1);
4453 /* An uninitialized decl with `extern' is a reference. */
4454 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4455 /* The index is a signed object `sizetype' bits wide. */
4456 tree index_type
= signed_type (sizetype
);
4458 declarator
= TREE_OPERAND (declarator
, 0);
4460 /* Check for some types that there cannot be arrays of. */
4462 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4464 error ("declaration of `%s' as array of voids", name
);
4465 type
= error_mark_node
;
4468 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4470 error ("declaration of `%s' as array of functions", name
);
4471 type
= error_mark_node
;
4474 if (size
== error_mark_node
)
4475 type
= error_mark_node
;
4477 if (type
== error_mark_node
)
4480 /* If this is a block level extern, it must live past the end
4481 of the function so that we can check it against other extern
4482 declarations (IDENTIFIER_LIMBO_VALUE). */
4483 if (extern_ref
&& allocation_temporary_p ())
4484 end_temporary_allocation ();
4486 /* If size was specified, set ITYPE to a range-type for that size.
4487 Otherwise, ITYPE remains null. finish_decl may figure it out
4488 from an initial value. */
4492 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4493 STRIP_TYPE_NOPS (size
);
4495 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4496 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4498 error ("size of array `%s' has non-integer type", name
);
4499 size
= integer_one_node
;
4502 if (pedantic
&& integer_zerop (size
))
4503 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4505 if (TREE_CODE (size
) == INTEGER_CST
)
4507 constant_expression_warning (size
);
4508 if (tree_int_cst_sgn (size
) < 0)
4510 error ("size of array `%s' is negative", name
);
4511 size
= integer_one_node
;
4516 /* Make sure the array size remains visibly nonconstant
4517 even if it is (eg) a const variable with known value. */
4522 if (TREE_CONSTANT (size
))
4523 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4525 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4529 /* Convert size to index_type, so that if it is a variable
4530 the computations will be done in the proper mode. */
4531 itype
= fold (build (MINUS_EXPR
, index_type
,
4532 convert (index_type
, size
),
4533 convert (index_type
, size_one_node
)));
4536 itype
= variable_size (itype
);
4537 itype
= build_index_type (itype
);
4540 #if 0 /* This had bad results for pointers to arrays, as in
4541 union incomplete (*foo)[4]; */
4542 /* Complain about arrays of incomplete types, except in typedefs. */
4544 if (TYPE_SIZE (type
) == 0
4545 /* Avoid multiple warnings for nested array types. */
4546 && TREE_CODE (type
) != ARRAY_TYPE
4547 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4548 && !C_TYPE_BEING_DEFINED (type
))
4549 warning ("array type has incomplete element type");
4552 #if 0 /* We shouldn't have a function type here at all!
4553 Functions aren't allowed as array elements. */
4554 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4555 && (constp
|| volatilep
))
4556 pedwarn ("ANSI C forbids const or volatile function types");
4559 /* Build the array type itself, then merge any constancy or
4560 volatility into the target type. We must do it in this order
4561 to ensure that the TYPE_MAIN_VARIANT field of the array type
4562 is set correctly. */
4564 type
= build_array_type (type
, itype
);
4565 if (constp
|| volatilep
)
4566 type
= c_build_type_variant (type
, constp
, volatilep
);
4568 #if 0 /* don't clear these; leave them set so that the array type
4569 or the variable is itself const or volatile. */
4575 C_TYPE_VARIABLE_SIZE (type
) = 1;
4577 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4579 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4580 || current_binding_level
== global_binding_level
);
4583 /* Declaring a function type.
4584 Make sure we have a valid type for the function to return. */
4585 if (type
== error_mark_node
)
4590 /* Warn about some types functions can't return. */
4592 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4594 error ("`%s' declared as function returning a function", name
);
4595 type
= integer_type_node
;
4597 if (TREE_CODE (type
) == ARRAY_TYPE
)
4599 error ("`%s' declared as function returning an array", name
);
4600 type
= integer_type_node
;
4603 #ifndef TRADITIONAL_RETURN_FLOAT
4604 /* Traditionally, declaring return type float means double. */
4606 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4607 type
= double_type_node
;
4608 #endif /* TRADITIONAL_RETURN_FLOAT */
4610 /* If this is a block level extern, it must live past the end
4611 of the function so that we can check it against other extern
4612 declarations (IDENTIFIER_LIMBO_VALUE). */
4613 if (extern_ref
&& allocation_temporary_p ())
4614 end_temporary_allocation ();
4616 /* Construct the function type and go to the next
4617 inner layer of declarator. */
4619 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4621 /* Say it's a definition
4622 only for the CALL_EXPR
4623 closest to the identifier. */
4624 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4625 #if 0 /* This seems to be false. We turn off temporary allocation
4626 above in this function if -traditional.
4627 And this code caused inconsistent results with prototypes:
4628 callers would ignore them, and pass arguments wrong. */
4630 /* Omit the arg types if -traditional, since the arg types
4631 and the list links might not be permanent. */
4632 type
= build_function_type (type
,
4634 ? NULL_TREE
: arg_types
);
4636 /* ANSI seems to say that `const int foo ();'
4637 does not make the function foo const. */
4638 if (constp
|| volatilep
)
4639 type
= c_build_type_variant (type
, constp
, volatilep
);
4643 type
= build_function_type (type
, arg_types
);
4644 declarator
= TREE_OPERAND (declarator
, 0);
4646 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4647 the formal parameter list of this FUNCTION_TYPE to point to
4648 the FUNCTION_TYPE node itself. */
4653 for (link
= current_function_parm_tags
;
4655 link
= TREE_CHAIN (link
))
4656 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4659 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4661 /* Merge any constancy or volatility into the target type
4664 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4665 && (constp
|| volatilep
))
4666 pedwarn ("ANSI C forbids const or volatile function types");
4667 if (constp
|| volatilep
)
4668 type
= c_build_type_variant (type
, constp
, volatilep
);
4673 type
= build_pointer_type (type
);
4675 /* Process a list of type modifier keywords
4676 (such as const or volatile) that were given inside the `*'. */
4678 if (TREE_TYPE (declarator
))
4680 register tree typemodlist
;
4682 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4683 typemodlist
= TREE_CHAIN (typemodlist
))
4685 if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_CONST
])
4687 else if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_VOLATILE
])
4692 error ("invalid type modifier within pointer declarator");
4696 pedwarn ("duplicate `const'");
4698 pedwarn ("duplicate `volatile'");
4701 declarator
= TREE_OPERAND (declarator
, 0);
4708 /* Now TYPE has the actual type. */
4710 /* If this is declaring a typedef name, return a TYPE_DECL. */
4712 if (specbits
& (1 << (int) RID_TYPEDEF
))
4715 /* Note that the grammar rejects storage classes
4716 in typenames, fields or parameters */
4717 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4718 && (constp
|| volatilep
))
4719 pedwarn ("ANSI C forbids const or volatile function types");
4720 if (constp
|| volatilep
)
4721 type
= c_build_type_variant (type
, constp
, volatilep
);
4723 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4724 if ((specbits
& (1 << (int) RID_SIGNED
))
4725 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4726 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4730 /* Detect the case of an array type of unspecified size
4731 which came, as such, direct from a typedef name.
4732 We must copy the type, so that each identifier gets
4733 a distinct type, so that each identifier's size can be
4734 controlled separately by its own initializer. */
4736 if (type
!= 0 && typedef_type
!= 0
4737 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4738 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4740 type
= build_array_type (TREE_TYPE (type
), 0);
4742 C_TYPE_VARIABLE_SIZE (type
) = 1;
4745 /* If this is a type name (such as, in a cast or sizeof),
4746 compute the type and return it now. */
4748 if (decl_context
== TYPENAME
)
4750 /* Note that the grammar rejects storage classes
4751 in typenames, fields or parameters */
4752 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4753 && (constp
|| volatilep
))
4754 pedwarn ("ANSI C forbids const or volatile function types");
4755 if (constp
|| volatilep
)
4756 type
= c_build_type_variant (type
, constp
, volatilep
);
4761 /* Aside from typedefs and type names (handle above),
4762 `void' at top level (not within pointer)
4763 is allowed only in public variables.
4764 We don't complain about parms either, but that is because
4765 a better error message can be made later. */
4767 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4768 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4769 && ((specbits
& (1 << (int) RID_EXTERN
))
4770 || (current_binding_level
== global_binding_level
4772 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4774 error ("variable or field `%s' declared void", name
);
4775 type
= integer_type_node
;
4778 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4779 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4784 if (decl_context
== PARM
)
4786 tree type_as_written
= type
;
4789 /* A parameter declared as an array of T is really a pointer to T.
4790 One declared as a function is really a pointer to a function. */
4792 if (TREE_CODE (type
) == ARRAY_TYPE
)
4794 /* Transfer const-ness of array into that of type pointed to. */
4795 type
= TREE_TYPE (type
);
4796 if (constp
|| volatilep
)
4797 type
= c_build_type_variant (type
, constp
, volatilep
);
4798 type
= build_pointer_type (type
);
4799 volatilep
= constp
= 0;
4802 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4804 if (pedantic
&& (constp
|| volatilep
))
4805 pedwarn ("ANSI C forbids const or volatile function types");
4806 if (constp
|| volatilep
)
4807 type
= c_build_type_variant (type
, constp
, volatilep
);
4808 type
= build_pointer_type (type
);
4809 volatilep
= constp
= 0;
4812 decl
= build_decl (PARM_DECL
, declarator
, type
);
4814 C_DECL_VARIABLE_SIZE (decl
) = 1;
4816 /* Compute the type actually passed in the parmlist,
4817 for the case where there is no prototype.
4818 (For example, shorts and chars are passed as ints.)
4819 When there is a prototype, this is overridden later. */
4821 DECL_ARG_TYPE (decl
) = type
;
4822 main_type
= (type
== error_mark_node
4824 : TYPE_MAIN_VARIANT (type
));
4825 if (main_type
== float_type_node
)
4826 DECL_ARG_TYPE (decl
) = double_type_node
;
4827 /* Don't use TYPE_PRECISION to decide whether to promote,
4828 because we should convert short if it's the same size as int,
4829 but we should not convert long if it's the same size as int. */
4830 else if (TREE_CODE (main_type
) != ERROR_MARK
4831 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
4833 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
4834 && TREE_UNSIGNED (type
))
4835 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
4837 DECL_ARG_TYPE (decl
) = integer_type_node
;
4840 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4842 else if (decl_context
== FIELD
)
4844 /* Structure field. It may not be a function. */
4846 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4848 error ("field `%s' declared as a function", name
);
4849 type
= build_pointer_type (type
);
4851 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
4853 error ("field `%s' has incomplete type", name
);
4854 type
= error_mark_node
;
4856 /* Move type qualifiers down to element of an array. */
4857 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4859 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4861 TYPE_DOMAIN (type
));
4862 #if 0 /* Leave the field const or volatile as well. */
4863 constp
= volatilep
= 0;
4866 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4868 C_DECL_VARIABLE_SIZE (decl
) = 1;
4870 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4872 /* Every function declaration is "external"
4873 except for those which are inside a function body
4874 in which `auto' is used.
4875 That is a case not specified by ANSI C,
4876 and we use it for forward declarations for nested functions. */
4877 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4878 || current_binding_level
== global_binding_level
);
4880 if (specbits
& (1 << (int) RID_AUTO
)
4881 && (pedantic
|| current_binding_level
== global_binding_level
))
4882 pedwarn ("invalid storage class for function `%s'", name
);
4883 if (specbits
& (1 << (int) RID_REGISTER
))
4884 error ("invalid storage class for function `%s'", name
);
4885 /* Function declaration not at top level.
4886 Storage classes other than `extern' are not allowed
4887 and `extern' makes no difference. */
4888 if (current_binding_level
!= global_binding_level
4889 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4891 pedwarn ("invalid storage class for function `%s'", name
);
4893 /* If this is a block level extern, it must live past the end
4894 of the function so that we can check it against other
4895 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4896 if (extern_ref
&& allocation_temporary_p ())
4897 end_temporary_allocation ();
4899 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4900 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4902 if (pedantic
&& (constp
|| volatilep
)
4903 && ! DECL_IN_SYSTEM_HEADER (decl
))
4904 pedwarn ("ANSI C forbids const or volatile functions");
4907 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
4908 warning ("`noreturn' function returns non-void value");
4911 DECL_EXTERNAL (decl
) = 1;
4912 /* Record absence of global scope for `static' or `auto'. */
4914 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4916 /* Record presence of `inline', if it is reasonable. */
4919 tree last
= tree_last (TYPE_ARG_TYPES (type
));
4921 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4922 warning ("cannot inline function `main'");
4923 else if (last
&& (TYPE_MAIN_VARIANT (TREE_VALUE (last
))
4925 warning ("inline declaration ignored for function with `...'");
4927 /* Assume that otherwise the function can be inlined. */
4928 DECL_INLINE (decl
) = 1;
4930 if (specbits
& (1 << (int) RID_EXTERN
))
4931 current_extern_inline
= 1;
4936 /* It's a variable. */
4937 /* An uninitialized decl with `extern' is a reference. */
4938 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4940 /* Move type qualifiers down to element of an array. */
4941 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4943 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4945 TYPE_DOMAIN (type
));
4946 #if 0 /* Leave the variable const or volatile as well. */
4947 constp
= volatilep
= 0;
4951 /* If this is a block level extern, it must live past the end
4952 of the function so that we can check it against other
4953 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4954 if (extern_ref
&& allocation_temporary_p ())
4955 end_temporary_allocation ();
4957 decl
= build_decl (VAR_DECL
, declarator
, type
);
4959 C_DECL_VARIABLE_SIZE (decl
) = 1;
4962 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4964 DECL_EXTERNAL (decl
) = extern_ref
;
4965 /* At top level, the presence of a `static' or `register' storage
4966 class specifier, or the absence of all storage class specifiers
4967 makes this declaration a definition (perhaps tentative). Also,
4968 the absence of both `static' and `register' makes it public. */
4969 if (current_binding_level
== global_binding_level
)
4973 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4974 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4976 /* Not at top level, only `static' makes a static definition. */
4979 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4980 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4983 if (specbits
& 1 << (int) RID_ITERATOR
)
4984 ITERATOR_P (decl
) = 1;
4987 /* Record `register' declaration for warnings on &
4988 and in case doing stupid register allocation. */
4990 if (specbits
& (1 << (int) RID_REGISTER
))
4991 DECL_REGISTER (decl
) = 1;
4993 /* Record constancy and volatility. */
4996 TREE_READONLY (decl
) = 1;
4999 TREE_SIDE_EFFECTS (decl
) = 1;
5000 TREE_THIS_VOLATILE (decl
) = 1;
5002 /* If a type has volatile components, it should be stored in memory.
5003 Otherwise, the fact that those components are volatile
5004 will be ignored, and would even crash the compiler. */
5005 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5006 mark_addressable (decl
);
5014 /* Decode the parameter-list info for a function type or function definition.
5015 The argument is the value returned by `get_parm_info' (or made in parse.y
5016 if there is an identifier list instead of a parameter decl list).
5017 These two functions are separate because when a function returns
5018 or receives functions then each is called multiple times but the order
5019 of calls is different. The last call to `grokparms' is always the one
5020 that contains the formal parameter names of a function definition.
5022 Store in `last_function_parms' a chain of the decls of parms.
5023 Also store in `last_function_parm_tags' a chain of the struct, union,
5024 and enum tags declared among the parms.
5026 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5028 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5029 a mere declaration. A nonempty identifier-list gets an error message
5030 when FUNCDEF_FLAG is zero. */
5033 grokparms (parms_info
, funcdef_flag
)
5037 tree first_parm
= TREE_CHAIN (parms_info
);
5039 last_function_parms
= TREE_PURPOSE (parms_info
);
5040 last_function_parm_tags
= TREE_VALUE (parms_info
);
5042 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5043 && !in_system_header
)
5044 warning ("function declaration isn't a prototype");
5047 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5050 pedwarn ("parameter names (without types) in function declaration");
5052 last_function_parms
= first_parm
;
5059 /* We no longer test FUNCDEF_FLAG.
5060 If the arg types are incomplete in a declaration,
5061 they must include undefined tags.
5062 These tags can never be defined in the scope of the declaration,
5063 so the types can never be completed,
5064 and no call can be compiled successfully. */
5066 /* In a fcn definition, arg types must be complete. */
5069 for (parm
= last_function_parms
, typelt
= first_parm
;
5071 parm
= TREE_CHAIN (parm
))
5072 /* Skip over any enumeration constants declared here. */
5073 if (TREE_CODE (parm
) == PARM_DECL
)
5075 /* Barf if the parameter itself has an incomplete type. */
5076 tree type
= TREE_VALUE (typelt
);
5077 if (TYPE_SIZE (type
) == 0)
5079 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5080 error ("parameter `%s' has incomplete type",
5081 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5083 warning ("parameter has incomplete type");
5086 TREE_VALUE (typelt
) = error_mark_node
;
5087 TREE_TYPE (parm
) = error_mark_node
;
5090 #if 0 /* This has been replaced by parm_tags_warning
5091 which uses a more accurate criterion for what to warn about. */
5094 /* Now warn if is a pointer to an incomplete type. */
5095 while (TREE_CODE (type
) == POINTER_TYPE
5096 || TREE_CODE (type
) == REFERENCE_TYPE
)
5097 type
= TREE_TYPE (type
);
5098 type
= TYPE_MAIN_VARIANT (type
);
5099 if (TYPE_SIZE (type
) == 0)
5101 if (DECL_NAME (parm
) != 0)
5102 warning ("parameter `%s' points to incomplete type",
5103 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5105 warning ("parameter points to incomplete type");
5109 typelt
= TREE_CHAIN (typelt
);
5112 /* Allocate the list of types the way we allocate a type. */
5113 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
5115 /* Construct a copy of the list of types
5116 on the saveable obstack. */
5118 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
5119 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
5121 return nreverse (result
);
5124 /* The list we have is permanent already. */
5130 /* Return a tree_list node with info on a parameter list just parsed.
5131 The TREE_PURPOSE is a chain of decls of those parms.
5132 The TREE_VALUE is a list of structure, union and enum tags defined.
5133 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5134 This tree_list node is later fed to `grokparms'.
5136 VOID_AT_END nonzero means append `void' to the end of the type-list.
5137 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5140 get_parm_info (void_at_end
)
5143 register tree decl
, t
;
5144 register tree types
= 0;
5146 tree tags
= gettags ();
5147 tree parms
= getdecls ();
5149 tree order
= current_binding_level
->parm_order
;
5151 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5152 if (void_at_end
&& parms
!= 0
5153 && TREE_CHAIN (parms
) == 0
5154 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
5155 && DECL_NAME (parms
) == 0)
5158 storedecls (NULL_TREE
);
5159 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
5160 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5163 /* Extract enumerator values and other non-parms declared with the parms.
5164 Likewise any forward parm decls that didn't have real parm decls. */
5165 for (decl
= parms
; decl
; )
5167 tree next
= TREE_CHAIN (decl
);
5169 if (TREE_CODE (decl
) != PARM_DECL
)
5171 TREE_CHAIN (decl
) = new_parms
;
5174 else if (TREE_ASM_WRITTEN (decl
))
5176 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
5177 TREE_CHAIN (decl
) = new_parms
;
5183 /* Put the parm decls back in the order they were in in the parm list. */
5184 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5187 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5189 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5192 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5195 /* Store the parmlist in the binding level since the old one
5196 is no longer a valid list. (We have changed the chain pointers.) */
5197 storedecls (new_parms
);
5199 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5200 /* There may also be declarations for enumerators if an enumeration
5201 type is declared among the parms. Ignore them here. */
5202 if (TREE_CODE (decl
) == PARM_DECL
)
5204 /* Since there is a prototype,
5205 args are passed in their declared types. */
5206 tree type
= TREE_TYPE (decl
);
5207 DECL_ARG_TYPE (decl
) = type
;
5208 #ifdef PROMOTE_PROTOTYPES
5209 if ((TREE_CODE (type
) == INTEGER_TYPE
5210 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5211 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5212 DECL_ARG_TYPE (decl
) = integer_type_node
;
5215 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5216 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5217 && DECL_NAME (decl
) == 0)
5219 error ("`void' in parameter list must be the entire list");
5225 return saveable_tree_cons (new_parms
, tags
,
5226 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5228 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5231 /* At end of parameter list, warn about any struct, union or enum tags
5232 defined within. Do so because these types cannot ever become complete. */
5235 parmlist_tags_warning ()
5240 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5242 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5243 /* An anonymous union parm type is meaningful as a GNU extension.
5244 So don't warn for that. */
5245 if (code
== UNION_TYPE
&& !pedantic
)
5247 if (TREE_PURPOSE (elt
) != 0)
5248 warning ("`%s %s' declared inside parameter list",
5249 (code
== RECORD_TYPE
? "struct"
5250 : code
== UNION_TYPE
? "union"
5252 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5254 warning ("anonymous %s declared inside parameter list",
5255 (code
== RECORD_TYPE
? "struct"
5256 : code
== UNION_TYPE
? "union"
5261 warning ("its scope is only this definition or declaration,");
5262 warning ("which is probably not what you want.");
5268 /* Get the struct, enum or union (CODE says which) with tag NAME.
5269 Define the tag as a forward-reference if it is not defined. */
5272 xref_tag (code
, name
)
5273 enum tree_code code
;
5276 int temporary
= allocation_temporary_p ();
5278 /* If a cross reference is requested, look up the type
5279 already defined for this tag and return it. */
5281 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5282 /* Even if this is the wrong type of tag, return what we found.
5283 There will be an error message anyway, from pending_xref_error.
5284 If we create an empty xref just for an invalid use of the type,
5285 the main result is to create lots of superfluous error messages. */
5289 push_obstacks_nochange ();
5291 if (current_binding_level
== global_binding_level
&& temporary
)
5292 end_temporary_allocation ();
5294 /* If no such tag is yet defined, create a forward-reference node
5295 and record it as the "definition".
5296 When a real declaration of this type is found,
5297 the forward-reference will be altered into a real type. */
5299 ref
= make_node (code
);
5300 if (code
== ENUMERAL_TYPE
)
5302 /* (In ANSI, Enums can be referred to only if already defined.) */
5304 pedwarn ("ANSI C forbids forward references to `enum' types");
5305 /* Give the type a default layout like unsigned int
5306 to avoid crashing if it does not get defined. */
5307 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5308 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5309 TREE_UNSIGNED (ref
) = 1;
5310 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5311 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5312 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5315 pushtag (name
, ref
);
5322 /* Make sure that the tag NAME is defined *in the current binding level*
5323 at least as a forward reference.
5324 CODE says which kind of tag NAME ought to be.
5326 We also do a push_obstacks_nochange
5327 whose matching pop is in finish_struct. */
5330 start_struct (code
, name
)
5331 enum tree_code code
;
5334 /* If there is already a tag defined at this binding level
5335 (as a forward reference), just return it. */
5337 register tree ref
= 0;
5339 push_obstacks_nochange ();
5340 if (current_binding_level
== global_binding_level
)
5341 end_temporary_allocation ();
5344 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5345 if (ref
&& TREE_CODE (ref
) == code
)
5347 C_TYPE_BEING_DEFINED (ref
) = 1;
5348 if (TYPE_FIELDS (ref
))
5349 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5350 : "redefinition of `struct %s'"),
5351 IDENTIFIER_POINTER (name
));
5356 /* Otherwise create a forward-reference just so the tag is in scope. */
5358 ref
= make_node (code
);
5359 pushtag (name
, ref
);
5360 C_TYPE_BEING_DEFINED (ref
) = 1;
5364 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5365 of a structure component, returning a FIELD_DECL node.
5366 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5368 This is done during the parsing of the struct declaration.
5369 The FIELD_DECL nodes are chained together and the lot of them
5370 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5373 grokfield (filename
, line
, declarator
, declspecs
, width
)
5376 tree declarator
, declspecs
, width
;
5380 /* The corresponding pop_obstacks is in finish_decl. */
5381 push_obstacks_nochange ();
5383 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5385 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5386 DECL_INITIAL (value
) = width
;
5388 maybe_objc_check_decl (value
);
5392 /* Function to help qsort sort FIELD_DECLs by name order. */
5395 field_decl_cmp (x
, y
)
5398 return (long)DECL_NAME (*x
) - (long)DECL_NAME (*y
);
5401 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5402 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5403 ATTRIBUTES are attributes to be applied to the structure.
5405 We also do a pop_obstacks to match the push in start_struct. */
5408 finish_struct (t
, fieldlist
, attributes
)
5415 int toplevel
= global_binding_level
== current_binding_level
;
5417 /* If this type was previously laid out as a forward reference,
5418 make sure we lay it out again. */
5422 decl_attributes (t
, attributes
, NULL_TREE
);
5424 /* Nameless union parm types are useful as GCC extension. */
5425 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5426 /* Otherwise, warn about any struct or union def. in parmlist. */
5427 if (in_parm_level_p ())
5430 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5431 : "structure defined inside parms"));
5432 else if (! flag_traditional
)
5433 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5434 : "structure defined inside parms"));
5437 old_momentary
= suspend_momentary ();
5439 if (fieldlist
== 0 && pedantic
)
5440 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union has no members"
5441 : "structure has no members"));
5443 /* Install struct as DECL_CONTEXT of each field decl.
5444 Also process specified field sizes.
5445 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5446 The specified size is found in the DECL_INITIAL.
5447 Store 0 there, except for ": 0" fields (so we can find them
5448 and delete them, below). */
5450 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5452 DECL_CONTEXT (x
) = t
;
5453 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5454 DECL_FIELD_SIZE (x
) = 0;
5456 /* If any field is const, the structure type is pseudo-const. */
5457 if (TREE_READONLY (x
))
5458 C_TYPE_FIELDS_READONLY (t
) = 1;
5461 /* A field that is pseudo-const makes the structure likewise. */
5462 tree t1
= TREE_TYPE (x
);
5463 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5464 t1
= TREE_TYPE (t1
);
5465 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5466 && C_TYPE_FIELDS_READONLY (t1
))
5467 C_TYPE_FIELDS_READONLY (t
) = 1;
5470 /* Any field that is volatile means variables of this type must be
5471 treated in some ways as volatile. */
5472 if (TREE_THIS_VOLATILE (x
))
5473 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5475 /* Any field of nominal variable size implies structure is too. */
5476 if (C_DECL_VARIABLE_SIZE (x
))
5477 C_TYPE_VARIABLE_SIZE (t
) = 1;
5479 /* Detect invalid nested redefinition. */
5480 if (TREE_TYPE (x
) == t
)
5481 error ("nested redefinition of `%s'",
5482 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5484 /* Detect invalid bit-field size. */
5485 if (DECL_INITIAL (x
))
5486 STRIP_NOPS (DECL_INITIAL (x
));
5487 if (DECL_INITIAL (x
))
5489 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5490 constant_expression_warning (DECL_INITIAL (x
));
5493 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5494 DECL_INITIAL (x
) = NULL
;
5498 /* Detect invalid bit-field type. */
5499 if (DECL_INITIAL (x
)
5500 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5501 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5503 error_with_decl (x
, "bit-field `%s' has invalid type");
5504 DECL_INITIAL (x
) = NULL
;
5506 if (DECL_INITIAL (x
) && pedantic
5507 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5508 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5509 /* Accept an enum that's equivalent to int or unsigned int. */
5510 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5511 && (TYPE_PRECISION (TREE_TYPE (x
))
5512 == TYPE_PRECISION (integer_type_node
))))
5513 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5515 /* Detect and ignore out of range field width. */
5516 if (DECL_INITIAL (x
))
5518 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5520 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5522 DECL_INITIAL (x
) = NULL
;
5523 error_with_decl (x
, "negative width in bit-field `%s'");
5525 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5526 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5528 DECL_INITIAL (x
) = NULL
;
5529 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5531 else if (width
== 0 && DECL_NAME (x
) != 0)
5533 error_with_decl (x
, "zero width for bit-field `%s'");
5534 DECL_INITIAL (x
) = NULL
;
5538 /* Process valid field width. */
5539 if (DECL_INITIAL (x
))
5541 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5543 DECL_FIELD_SIZE (x
) = width
;
5544 DECL_BIT_FIELD (x
) = 1;
5545 DECL_INITIAL (x
) = NULL
;
5549 /* field size 0 => force desired amount of alignment. */
5550 #ifdef EMPTY_FIELD_BOUNDARY
5551 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5553 #ifdef PCC_BITFIELD_TYPE_MATTERS
5554 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5555 TYPE_ALIGN (TREE_TYPE (x
)));
5559 else if (TREE_TYPE (x
) != error_mark_node
)
5561 int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5562 : TYPE_ALIGN (TREE_TYPE (x
)));
5563 /* Non-bit-fields are aligned for their type, except packed
5564 fields which require only BITS_PER_UNIT alignment. */
5565 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5569 /* Now DECL_INITIAL is null on all members. */
5571 /* Delete all duplicate fields from the fieldlist */
5572 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5573 /* Anonymous fields aren't duplicates. */
5574 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5578 register tree y
= fieldlist
;
5582 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5588 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5590 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5591 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5593 else x
= TREE_CHAIN (x
);
5596 /* Now we have the nearly final fieldlist. Record it,
5597 then lay out the structure or union (including the fields). */
5599 TYPE_FIELDS (t
) = fieldlist
;
5603 /* Delete all zero-width bit-fields from the front of the fieldlist */
5605 && DECL_INITIAL (fieldlist
))
5606 fieldlist
= TREE_CHAIN (fieldlist
);
5607 /* Delete all such members from the rest of the fieldlist */
5608 for (x
= fieldlist
; x
;)
5610 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5611 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5612 else x
= TREE_CHAIN (x
);
5615 /* Now we have the truly final field list.
5616 Store it in this type and in the variants. */
5618 TYPE_FIELDS (t
) = fieldlist
;
5620 /* If there are lots of fields, sort so we can look through them fast.
5621 We arbitrarily consider 16 or more elts to be "a lot". */
5625 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5636 len
+= list_length (x
);
5637 /* Use the same allocation policy here that make_node uses, to
5638 ensure that this lives as long as the rest of the struct decl.
5639 All decls in an inline function need to be saved. */
5640 if (allocation_temporary_p ())
5641 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5643 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5645 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5646 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5648 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5650 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5651 field_array
[len
++] = x
;
5653 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5657 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5659 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5660 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5661 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5664 /* Promote each bit-field's type to int if it is narrower than that. */
5665 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5666 if (DECL_BIT_FIELD (x
)
5667 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x
))
5668 || DECL_FIELD_SIZE (x
) < TYPE_PRECISION (integer_type_node
)))
5670 tree type
= TREE_TYPE (x
);
5672 /* Preserve unsignedness if traditional
5673 or if not really getting any wider. */
5674 if (TREE_UNSIGNED (type
)
5675 && (flag_traditional
5677 (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
5679 DECL_FIELD_SIZE (x
) == TYPE_PRECISION (integer_type_node
))))
5680 TREE_TYPE (x
) = unsigned_type_node
;
5682 TREE_TYPE (x
) = integer_type_node
;
5685 /* If this structure or union completes the type of any previous
5686 variable declaration, lay it out and output its rtl. */
5688 if (current_binding_level
->n_incomplete
!= 0)
5691 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5693 if (TREE_TYPE (decl
) == t
5694 && TREE_CODE (decl
) != TYPE_DECL
)
5696 layout_decl (decl
, 0);
5697 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5698 maybe_objc_check_decl (decl
);
5699 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5702 --current_binding_level
->n_incomplete
;
5704 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5705 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5707 tree element
= TREE_TYPE (decl
);
5708 while (TREE_CODE (element
) == ARRAY_TYPE
)
5709 element
= TREE_TYPE (element
);
5711 layout_array_type (TREE_TYPE (decl
));
5716 resume_momentary (old_momentary
);
5718 /* Finish debugging output for this type. */
5719 rest_of_type_compilation (t
, toplevel
);
5721 /* The matching push is in start_struct. */
5727 /* Lay out the type T, and its element type, and so on. */
5730 layout_array_type (t
)
5733 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5734 layout_array_type (TREE_TYPE (t
));
5738 /* Begin compiling the definition of an enumeration type.
5739 NAME is its name (or null if anonymous).
5740 Returns the type object, as yet incomplete.
5741 Also records info about it so that build_enumerator
5742 may be used to declare the individual values as they are read. */
5748 register tree enumtype
= 0;
5750 /* If this is the real definition for a previous forward reference,
5751 fill in the contents in the same object that used to be the
5752 forward reference. */
5755 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5757 /* The corresponding pop_obstacks is in finish_enum. */
5758 push_obstacks_nochange ();
5759 /* If these symbols and types are global, make them permanent. */
5760 if (current_binding_level
== global_binding_level
)
5761 end_temporary_allocation ();
5763 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5765 enumtype
= make_node (ENUMERAL_TYPE
);
5766 pushtag (name
, enumtype
);
5769 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5771 if (TYPE_VALUES (enumtype
) != 0)
5773 /* This enum is a named one that has been declared already. */
5774 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5776 /* Completely replace its old definition.
5777 The old enumerators remain defined, however. */
5778 TYPE_VALUES (enumtype
) = 0;
5781 enum_next_value
= integer_zero_node
;
5787 /* After processing and defining all the values of an enumeration type,
5788 install their decls in the enumeration type and finish it off.
5789 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5790 and ATTRIBUTES are the specified attributes.
5791 Returns ENUMTYPE. */
5794 finish_enum (enumtype
, values
, attributes
)
5799 register tree pair
, tem
;
5800 tree minnode
= 0, maxnode
= 0;
5801 int lowprec
, highprec
, precision
;
5802 int toplevel
= global_binding_level
== current_binding_level
;
5804 if (in_parm_level_p ())
5805 warning ("enum defined inside parms");
5807 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5809 /* Calculate the maximum value of any enumerator in this type. */
5811 if (values
== error_mark_node
)
5812 minnode
= maxnode
= integer_zero_node
;
5814 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5816 tree value
= TREE_VALUE (pair
);
5818 minnode
= maxnode
= TREE_VALUE (pair
);
5821 if (tree_int_cst_lt (maxnode
, value
))
5823 if (tree_int_cst_lt (value
, minnode
))
5828 TYPE_MIN_VALUE (enumtype
) = minnode
;
5829 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5831 /* An enum can have some negative values; then it is signed. */
5832 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
5834 /* Determine the precision this type needs. */
5836 lowprec
= min_precision (minnode
, TREE_UNSIGNED (enumtype
));
5837 highprec
= min_precision (maxnode
, TREE_UNSIGNED (enumtype
));
5838 precision
= MAX (lowprec
, highprec
);
5840 if (flag_short_enums
|| TYPE_PACKED (enumtype
)
5841 || precision
> TYPE_PRECISION (integer_type_node
))
5842 /* Use the width of the narrowest normal C type which is wide enough. */
5843 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (type_for_size (precision
, 1));
5845 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
5847 TYPE_SIZE (enumtype
) = 0;
5848 layout_type (enumtype
);
5850 if (values
!= error_mark_node
)
5852 /* Change the type of the enumerators to be the enum type.
5853 Formerly this was done only for enums that fit in an int,
5854 but the comment said it was done only for enums wider than int.
5855 It seems necessary to do this for wide enums,
5856 and best not to change what's done for ordinary narrower ones. */
5857 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5859 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
5860 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
5861 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
5862 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
5865 /* Replace the decl nodes in VALUES with their names. */
5866 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5867 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
5869 TYPE_VALUES (enumtype
) = values
;
5872 /* Fix up all variant types of this enum type. */
5873 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5875 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5876 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5877 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5878 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5879 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5880 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5881 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5882 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5885 /* Finish debugging output for this type. */
5886 rest_of_type_compilation (enumtype
, toplevel
);
5888 /* This matches a push in start_enum. */
5894 /* Build and install a CONST_DECL for one value of the
5895 current enumeration type (one that was begun with start_enum).
5896 Return a tree-list containing the CONST_DECL and its value.
5897 Assignment of sequential values by default is handled here. */
5900 build_enumerator (name
, value
)
5903 register tree decl
, type
;
5905 /* Validate and default VALUE. */
5907 /* Remove no-op casts from the value. */
5909 STRIP_TYPE_NOPS (value
);
5913 if (TREE_CODE (value
) == INTEGER_CST
)
5915 value
= default_conversion (value
);
5916 constant_expression_warning (value
);
5920 error ("enumerator value for `%s' not integer constant",
5921 IDENTIFIER_POINTER (name
));
5926 /* Default based on previous value. */
5927 /* It should no longer be possible to have NON_LVALUE_EXPR
5931 value
= enum_next_value
;
5933 error ("overflow in enumeration values");
5936 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5938 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5939 value
= integer_zero_node
;
5942 /* Set basis for default for next value. */
5943 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5944 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5946 /* Now create a declaration for the enum value name. */
5948 type
= TREE_TYPE (value
);
5949 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5950 TYPE_PRECISION (integer_type_node
)),
5952 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5953 && TREE_UNSIGNED (type
)));
5955 decl
= build_decl (CONST_DECL
, name
, type
);
5956 DECL_INITIAL (decl
) = value
;
5957 TREE_TYPE (value
) = type
;
5960 return saveable_tree_cons (decl
, value
, NULL_TREE
);
5963 /* Create the FUNCTION_DECL for a function definition.
5964 DECLSPECS, DECLARATOR, and ATTRIBUTES are the parts of the declaration;
5965 they describe the function's name and the type it returns,
5966 but twisted together in a fashion that parallels the syntax of C.
5968 This function creates a binding context for the function body
5969 as well as setting up the FUNCTION_DECL in current_function_decl.
5971 Returns 1 on success. If the DECLARATOR is not suitable for a function
5972 (it defines a datum instead), we return 0, which tells
5973 yyparse to report a parse error.
5975 NESTED is nonzero for a function nested within another function. */
5978 start_function (declspecs
, declarator
, attributes
, nested
)
5979 tree declarator
, declspecs
, attributes
;
5982 tree decl1
, old_decl
;
5984 int old_immediate_size_expand
= immediate_size_expand
;
5986 current_function_returns_value
= 0; /* Assume, until we see it does. */
5987 current_function_returns_null
= 0;
5988 warn_about_return_type
= 0;
5989 current_extern_inline
= 0;
5990 c_function_varargs
= 0;
5992 shadowed_labels
= 0;
5994 /* Don't expand any sizes in the return type of the function. */
5995 immediate_size_expand
= 0;
5997 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5999 /* If the declarator is not suitable for a function definition,
6000 cause a syntax error. */
6005 decl_attributes (decl1
, NULL_TREE
, attributes
);
6007 announce_function (decl1
);
6009 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
6011 error ("return-type is an incomplete type");
6012 /* Make it return void instead. */
6014 = build_function_type (void_type_node
,
6015 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6018 if (warn_about_return_type
)
6019 warning ("return-type defaults to `int'");
6021 /* Save the parm names or decls from this function's declarator
6022 where store_parm_decls will find them. */
6023 current_function_parms
= last_function_parms
;
6024 current_function_parm_tags
= last_function_parm_tags
;
6026 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6027 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6028 DECL_INITIAL (decl1
) = error_mark_node
;
6030 /* If this definition isn't a prototype and we had a prototype declaration
6031 before, copy the arg type info from that prototype.
6032 But not if what we had before was a builtin function. */
6033 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6034 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6035 && !DECL_BUILT_IN (old_decl
)
6036 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6037 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6038 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6040 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6041 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6042 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6045 /* If there is no explicit declaration, look for any out-of-scope implicit
6048 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6050 /* Optionally warn of old-fashioned def with no previous prototype. */
6051 if (warn_strict_prototypes
6052 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6053 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
6054 warning ("function declaration isn't a prototype");
6055 /* Optionally warn of any global def with no previous prototype. */
6056 else if (warn_missing_prototypes
6057 && TREE_PUBLIC (decl1
)
6058 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
6059 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6060 warning_with_decl (decl1
, "no previous prototype for `%s'");
6061 /* Optionally warn of any def with no previous prototype
6062 if the function has already been used. */
6063 else if (warn_missing_prototypes
6064 && old_decl
!= 0 && TREE_USED (old_decl
)
6065 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6066 warning_with_decl (decl1
,
6067 "`%s' was used with no prototype before its definition");
6068 /* Optionally warn of any global def with no previous declaration. */
6069 else if (warn_missing_declarations
6070 && TREE_PUBLIC (decl1
)
6072 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6073 warning_with_decl (decl1
, "no previous declaration for `%s'");
6074 /* Optionally warn of any def with no previous declaration
6075 if the function has already been used. */
6076 else if (warn_missing_declarations
6077 && old_decl
!= 0 && TREE_USED (old_decl
)
6078 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6079 warning_with_decl (decl1
,
6080 "`%s' was used with no declaration before its definition");
6082 /* This is a definition, not a reference.
6083 So normally clear DECL_EXTERNAL.
6084 However, `extern inline' acts like a declaration
6085 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6086 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6088 /* This function exists in static storage.
6089 (This does not mean `static' in the C sense!) */
6090 TREE_STATIC (decl1
) = 1;
6092 /* A nested function is not global. */
6093 if (current_function_decl
!= 0)
6094 TREE_PUBLIC (decl1
) = 0;
6096 /* Record the decl so that the function name is defined.
6097 If we already have a decl for this name, and it is a FUNCTION_DECL,
6098 use the old decl. */
6100 current_function_decl
= pushdecl (decl1
);
6103 declare_parm_level (1);
6104 current_binding_level
->subblocks_tag_transparent
= 1;
6106 make_function_rtl (current_function_decl
);
6108 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6109 /* Promote the value to int before returning it. */
6110 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6112 /* It retains unsignedness if traditional
6113 or if not really getting wider. */
6114 if (TREE_UNSIGNED (restype
)
6115 && (flag_traditional
6116 || (TYPE_PRECISION (restype
)
6117 == TYPE_PRECISION (integer_type_node
))))
6118 restype
= unsigned_type_node
;
6120 restype
= integer_type_node
;
6122 DECL_RESULT (current_function_decl
)
6123 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6126 /* Allocate further tree nodes temporarily during compilation
6127 of this function only. */
6128 temporary_allocation ();
6130 /* If this fcn was already referenced via a block-scope `extern' decl
6131 (or an implicit decl), propagate certain information about the usage. */
6132 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6133 TREE_ADDRESSABLE (current_function_decl
) = 1;
6135 immediate_size_expand
= old_immediate_size_expand
;
6140 /* Record that this function is going to be a varargs function.
6141 This is called before store_parm_decls, which is too early
6142 to call mark_varargs directly. */
6147 c_function_varargs
= 1;
6150 /* Store the parameter declarations into the current function declaration.
6151 This is called after parsing the parameter declarations, before
6152 digesting the body of the function.
6154 For an old-style definition, modify the function's type
6155 to specify at least the number of arguments. */
6160 register tree fndecl
= current_function_decl
;
6163 /* This is either a chain of PARM_DECLs (if a prototype was used)
6164 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6165 tree specparms
= current_function_parms
;
6167 /* This is a list of types declared among parms in a prototype. */
6168 tree parmtags
= current_function_parm_tags
;
6170 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6171 register tree parmdecls
= getdecls ();
6173 /* This is a chain of any other decls that came in among the parm
6174 declarations. If a parm is declared with enum {foo, bar} x;
6175 then CONST_DECLs for foo and bar are put here. */
6178 /* Nonzero if this definition is written with a prototype. */
6181 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6183 /* This case is when the function was defined with an ANSI prototype.
6184 The parms already have decls, so we need not do anything here
6185 except record them as in effect
6186 and complain if any redundant old-style parm decls were written. */
6197 error_with_decl (fndecl
,
6198 "parm types given both in parmlist and separately");
6199 /* Get rid of the erroneous decls; don't keep them on
6200 the list of parms, since they might not be PARM_DECLs. */
6201 for (decl
= current_binding_level
->names
;
6202 decl
; decl
= TREE_CHAIN (decl
))
6203 if (DECL_NAME (decl
))
6204 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6205 for (link
= current_binding_level
->shadowed
;
6206 link
; link
= TREE_CHAIN (link
))
6207 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6208 current_binding_level
->names
= 0;
6209 current_binding_level
->shadowed
= 0;
6212 specparms
= nreverse (specparms
);
6213 for (parm
= specparms
; parm
; parm
= next
)
6215 next
= TREE_CHAIN (parm
);
6216 if (TREE_CODE (parm
) == PARM_DECL
)
6218 if (DECL_NAME (parm
) == 0)
6219 error_with_decl (parm
, "parameter name omitted");
6220 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6222 error_with_decl (parm
, "parameter `%s' declared void");
6223 /* Change the type to error_mark_node so this parameter
6224 will be ignored by assign_parms. */
6225 TREE_TYPE (parm
) = error_mark_node
;
6231 /* If we find an enum constant or a type tag,
6232 put it aside for the moment. */
6233 TREE_CHAIN (parm
) = 0;
6234 others
= chainon (others
, parm
);
6238 /* Get the decls in their original chain order
6239 and record in the function. */
6240 DECL_ARGUMENTS (fndecl
) = getdecls ();
6243 /* If this function takes a variable number of arguments,
6244 add a phony parameter to the end of the parm list,
6245 to represent the position of the first unnamed argument. */
6246 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6249 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6250 /* Let's hope the address of the unnamed parm
6251 won't depend on its type. */
6252 TREE_TYPE (dummy
) = integer_type_node
;
6253 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6254 DECL_ARGUMENTS (fndecl
)
6255 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6259 /* Now pushdecl the enum constants. */
6260 for (parm
= others
; parm
; parm
= next
)
6262 next
= TREE_CHAIN (parm
);
6263 if (DECL_NAME (parm
) == 0)
6265 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6267 else if (TREE_CODE (parm
) != PARM_DECL
)
6271 storetags (chainon (parmtags
, gettags ()));
6275 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6276 each with a parm name as the TREE_VALUE.
6278 PARMDECLS is a chain of declarations for parameters.
6279 Warning! It can also contain CONST_DECLs which are not parameters
6280 but are names of enumerators of any enum types
6281 declared among the parameters.
6283 First match each formal parameter name with its declaration.
6284 Associate decls with the names and store the decls
6285 into the TREE_PURPOSE slots. */
6287 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6288 DECL_RESULT (parm
) = 0;
6290 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6292 register tree tail
, found
= NULL
;
6294 if (TREE_VALUE (parm
) == 0)
6296 error_with_decl (fndecl
, "parameter name missing from parameter list");
6297 TREE_PURPOSE (parm
) = 0;
6301 /* See if any of the parmdecls specifies this parm by name.
6302 Ignore any enumerator decls. */
6303 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6304 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6305 && TREE_CODE (tail
) == PARM_DECL
)
6311 /* If declaration already marked, we have a duplicate name.
6312 Complain, and don't use this decl twice. */
6313 if (found
&& DECL_RESULT (found
) != 0)
6315 error_with_decl (found
, "multiple parameters named `%s'");
6319 /* If the declaration says "void", complain and ignore it. */
6320 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6322 error_with_decl (found
, "parameter `%s' declared void");
6323 TREE_TYPE (found
) = integer_type_node
;
6324 DECL_ARG_TYPE (found
) = integer_type_node
;
6325 layout_decl (found
, 0);
6328 /* Traditionally, a parm declared float is actually a double. */
6329 if (found
&& flag_traditional
6330 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6332 TREE_TYPE (found
) = double_type_node
;
6333 DECL_ARG_TYPE (found
) = double_type_node
;
6334 layout_decl (found
, 0);
6337 /* If no declaration found, default to int. */
6340 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6342 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6343 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6344 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6346 warning_with_decl (found
, "type of `%s' defaults to `int'");
6350 TREE_PURPOSE (parm
) = found
;
6352 /* Mark this decl as "already found" -- see test, above.
6353 It is safe to use DECL_RESULT for this
6354 since it is not used in PARM_DECLs or CONST_DECLs. */
6355 DECL_RESULT (found
) = error_mark_node
;
6358 /* Put anything which is on the parmdecls chain and which is
6359 not a PARM_DECL onto the list NONPARMS. (The types of
6360 non-parm things which might appear on the list include
6361 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6362 any actual PARM_DECLs not matched with any names. */
6365 for (parm
= parmdecls
; parm
; )
6367 tree next
= TREE_CHAIN (parm
);
6368 TREE_CHAIN (parm
) = 0;
6370 if (TREE_CODE (parm
) != PARM_DECL
)
6371 nonparms
= chainon (nonparms
, parm
);
6374 /* Complain about args with incomplete types. */
6375 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6377 error_with_decl (parm
, "parameter `%s' has incomplete type");
6378 TREE_TYPE (parm
) = error_mark_node
;
6381 if (DECL_RESULT (parm
) == 0)
6383 error_with_decl (parm
,
6384 "declaration for parameter `%s' but no such parameter");
6385 /* Pretend the parameter was not missing.
6386 This gets us to a standard state and minimizes
6387 further error messages. */
6389 = chainon (specparms
,
6390 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6397 /* Chain the declarations together in the order of the list of names. */
6398 /* Store that chain in the function decl, replacing the list of names. */
6400 DECL_ARGUMENTS (fndecl
) = 0;
6403 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6404 if (TREE_PURPOSE (parm
))
6407 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6409 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6410 last
= TREE_PURPOSE (parm
);
6411 TREE_CHAIN (last
) = 0;
6415 /* If there was a previous prototype,
6416 set the DECL_ARG_TYPE of each argument according to
6417 the type previously specified, and report any mismatches. */
6419 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6422 for (parm
= DECL_ARGUMENTS (fndecl
),
6423 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6424 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6425 != void_type_node
));
6426 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6428 if (parm
== 0 || type
== 0
6429 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6431 error ("number of arguments doesn't match prototype");
6432 error_with_file_and_line (current_function_prototype_file
,
6433 current_function_prototype_line
,
6434 "prototype declaration");
6437 /* Type for passing arg must be consistent
6438 with that declared for the arg. */
6439 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6441 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6442 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6444 /* Adjust argument to match prototype. E.g. a previous
6445 `int foo(float);' prototype causes
6446 `int foo(x) float x; {...}' to be treated like
6447 `int foo(float x) {...}'. This is particularly
6448 useful for argument types like uid_t. */
6449 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6450 #ifdef PROMOTE_PROTOTYPES
6451 if ((TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6452 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6453 && TYPE_PRECISION (TREE_TYPE (parm
))
6454 < TYPE_PRECISION (integer_type_node
))
6455 DECL_ARG_TYPE (parm
) = integer_type_node
;
6459 pedwarn ("promoted argument `%s' doesn't match prototype",
6460 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6461 warning_with_file_and_line
6462 (current_function_prototype_file
,
6463 current_function_prototype_line
,
6464 "prototype declaration");
6467 /* If -traditional, allow `int' argument to match
6468 `unsigned' prototype. */
6469 else if (! (flag_traditional
6470 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6471 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6473 error ("argument `%s' doesn't match prototype",
6474 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6475 error_with_file_and_line (current_function_prototype_file
,
6476 current_function_prototype_line
,
6477 "prototype declaration");
6481 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6484 /* Otherwise, create a prototype that would match. */
6488 tree actual
= 0, last
= 0, type
;
6490 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6492 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6495 TREE_CHAIN (last
) = type
;
6500 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6502 TREE_CHAIN (last
) = type
;
6506 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6507 of the type of this function, but we need to avoid having this
6508 affect the types of other similarly-typed functions, so we must
6509 first force the generation of an identical (but separate) type
6510 node for the relevant function type. The new node we create
6511 will be a variant of the main variant of the original function
6514 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6516 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6519 /* Now store the final chain of decls for the arguments
6520 as the decl-chain of the current lexical scope.
6521 Put the enumerators in as well, at the front so that
6522 DECL_ARGUMENTS is not modified. */
6524 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6527 /* Make sure the binding level for the top of the function body
6528 gets a BLOCK if there are any in the function.
6529 Otherwise, the dbx output is wrong. */
6531 keep_next_if_subblocks
= 1;
6533 /* ??? This might be an improvement,
6534 but needs to be thought about some more. */
6536 keep_next_level_flag
= 1;
6539 /* Write a record describing this function definition to the prototypes
6540 file (if requested). */
6542 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6544 /* Initialize the RTL code for the function. */
6546 init_function_start (fndecl
, input_filename
, lineno
);
6548 /* If this is a varargs function, inform function.c. */
6550 if (c_function_varargs
)
6553 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6555 declare_function_name ();
6557 /* Set up parameters and prepare for return, for the function. */
6559 expand_function_start (fndecl
, 0);
6561 /* If this function is `main', emit a call to `__main'
6562 to run global initializers, etc. */
6563 if (DECL_NAME (fndecl
)
6564 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6565 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6566 expand_main_function ();
6569 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6570 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6571 stands for an ellipsis in the identifier list.
6573 PARMLIST is the data returned by get_parm_info for the
6574 parmlist that follows the semicolon.
6576 We return a value of the same sort that get_parm_info returns,
6577 except that it describes the combination of identifiers and parmlist. */
6580 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6581 tree specparms
, parmlist
;
6584 register tree fndecl
= current_function_decl
;
6587 tree parmdecls
= TREE_PURPOSE (parmlist
);
6589 /* This is a chain of any other decls that came in among the parm
6590 declarations. They were separated already by get_parm_info,
6591 so we just need to keep them separate. */
6592 tree nonparms
= TREE_VALUE (parmlist
);
6596 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6597 DECL_RESULT (parm
) = 0;
6599 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6601 register tree tail
, found
= NULL
;
6603 /* See if any of the parmdecls specifies this parm by name. */
6604 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6605 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6611 /* If declaration already marked, we have a duplicate name.
6612 Complain, and don't use this decl twice. */
6613 if (found
&& DECL_RESULT (found
) != 0)
6615 error_with_decl (found
, "multiple parameters named `%s'");
6619 /* If the declaration says "void", complain and ignore it. */
6620 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6622 error_with_decl (found
, "parameter `%s' declared void");
6623 TREE_TYPE (found
) = integer_type_node
;
6624 DECL_ARG_TYPE (found
) = integer_type_node
;
6625 layout_decl (found
, 0);
6628 /* Traditionally, a parm declared float is actually a double. */
6629 if (found
&& flag_traditional
6630 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6632 TREE_TYPE (found
) = double_type_node
;
6633 DECL_ARG_TYPE (found
) = double_type_node
;
6634 layout_decl (found
, 0);
6637 /* If no declaration found, default to int. */
6640 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6642 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6643 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6644 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6645 error_with_decl (found
, "type of parameter `%s' is not declared");
6649 TREE_PURPOSE (parm
) = found
;
6651 /* Mark this decl as "already found" -- see test, above.
6652 It is safe to use DECL_RESULT for this
6653 since it is not used in PARM_DECLs or CONST_DECLs. */
6654 DECL_RESULT (found
) = error_mark_node
;
6657 /* Complain about any actual PARM_DECLs not matched with any names. */
6659 for (parm
= parmdecls
; parm
; )
6661 tree next
= TREE_CHAIN (parm
);
6662 TREE_CHAIN (parm
) = 0;
6664 /* Complain about args with incomplete types. */
6665 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6667 error_with_decl (parm
, "parameter `%s' has incomplete type");
6668 TREE_TYPE (parm
) = error_mark_node
;
6671 if (DECL_RESULT (parm
) == 0)
6673 error_with_decl (parm
,
6674 "declaration for parameter `%s' but no such parameter");
6675 /* Pretend the parameter was not missing.
6676 This gets us to a standard state and minimizes
6677 further error messages. */
6679 = chainon (specparms
,
6680 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6686 /* Chain the declarations together in the order of the list of names.
6687 At the same time, build up a list of their types, in reverse order. */
6693 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6694 if (TREE_PURPOSE (parm
))
6697 parmdecls
= TREE_PURPOSE (parm
);
6699 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6700 last
= TREE_PURPOSE (parm
);
6701 TREE_CHAIN (last
) = 0;
6703 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6708 return saveable_tree_cons (parmdecls
, nonparms
,
6709 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
6711 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
6714 /* Finish up a function declaration and compile that function
6715 all the way to assembler language output. The free the storage
6716 for the function definition.
6718 This is called after parsing the body of the function definition.
6720 NESTED is nonzero if the function being finished is nested in another. */
6723 finish_function (nested
)
6726 register tree fndecl
= current_function_decl
;
6728 /* TREE_READONLY (fndecl) = 1;
6729 This caused &foo to be of type ptr-to-const-function
6730 which then got a warning when stored in a ptr-to-function variable. */
6733 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6735 /* Must mark the RESULT_DECL as being in this function. */
6737 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6739 /* Obey `register' declarations if `setjmp' is called in this fn. */
6740 if (flag_traditional
&& current_function_calls_setjmp
)
6742 setjmp_protect (DECL_INITIAL (fndecl
));
6743 setjmp_protect_args ();
6746 #ifdef DEFAULT_MAIN_RETURN
6747 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6749 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6750 != integer_type_node
)
6751 warning_with_decl (fndecl
, "return type of `%s' is not `int'");
6754 /* Make it so that `main' always returns success by default. */
6755 DEFAULT_MAIN_RETURN
;
6760 /* Generate rtl for function exit. */
6761 expand_function_end (input_filename
, lineno
, 0);
6763 /* So we can tell if jump_optimize sets it to 1. */
6766 /* Run the optimizers and output the assembler code for this function. */
6767 rest_of_compilation (fndecl
);
6769 current_function_returns_null
|= can_reach_end
;
6771 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6772 warning ("`noreturn' function does return");
6773 else if (warn_return_type
&& can_reach_end
6774 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
6775 /* If this function returns non-void and control can drop through,
6777 warning ("control reaches end of non-void function");
6778 /* With just -W, complain only if function returns both with
6779 and without a value. */
6780 else if (extra_warnings
6781 && current_function_returns_value
&& current_function_returns_null
)
6782 warning ("this function may return with or without a value");
6784 /* If requested, warn about function definitions where the function will
6785 return a value (usually of some struct or union type) which itself will
6786 take up a lot of stack space. */
6788 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6790 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6794 register tree ret_type_size
= TYPE_SIZE (ret_type
);
6796 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
6799 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
6801 if (units
> larger_than_size
)
6802 warning_with_decl (fndecl
,
6803 "size of return value of `%s' is %u bytes",
6809 /* Free all the tree nodes making up this function. */
6810 /* Switch back to allocating nodes permanently
6811 until we start another function. */
6813 permanent_allocation (1);
6815 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6817 /* Stop pointing to the local nodes about to be freed. */
6818 /* But DECL_INITIAL must remain nonzero so we know this
6819 was an actual function definition. */
6820 /* For a nested function, this is done in pop_c_function_context. */
6821 /* If rest_of_compilation set this to 0, leave it 0. */
6822 if (DECL_INITIAL (fndecl
) != 0)
6823 DECL_INITIAL (fndecl
) = error_mark_node
;
6824 DECL_ARGUMENTS (fndecl
) = 0;
6827 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6829 #ifndef ASM_OUTPUT_CONSTRUCTOR
6830 if (! flag_gnu_linker
)
6831 static_ctors
= perm_tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6834 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
6836 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6838 #ifndef ASM_OUTPUT_DESTRUCTOR
6839 if (! flag_gnu_linker
)
6840 static_dtors
= perm_tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6843 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
6848 /* Let the error reporting routines know that we're outside a
6849 function. For a nested function, this value is used in
6850 pop_c_function_context and then reset via pop_function_context. */
6851 current_function_decl
= NULL
;
6855 /* Save and restore the variables in this file and elsewhere
6856 that keep track of the progress of compilation of the current function.
6857 Used for nested functions. */
6861 struct c_function
*next
;
6863 tree shadowed_labels
;
6866 int warn_about_return_type
;
6868 struct binding_level
*binding_level
;
6871 struct c_function
*c_function_chain
;
6873 /* Save and reinitialize the variables
6874 used during compilation of a C function. */
6877 push_c_function_context ()
6879 struct c_function
*p
6880 = (struct c_function
*) xmalloc (sizeof (struct c_function
));
6883 pedwarn ("ANSI C forbids nested functions");
6885 push_function_context ();
6887 p
->next
= c_function_chain
;
6888 c_function_chain
= p
;
6890 p
->named_labels
= named_labels
;
6891 p
->shadowed_labels
= shadowed_labels
;
6892 p
->returns_value
= current_function_returns_value
;
6893 p
->returns_null
= current_function_returns_null
;
6894 p
->warn_about_return_type
= warn_about_return_type
;
6895 p
->extern_inline
= current_extern_inline
;
6896 p
->binding_level
= current_binding_level
;
6899 /* Restore the variables used during compilation of a C function. */
6902 pop_c_function_context ()
6904 struct c_function
*p
= c_function_chain
;
6907 /* Bring back all the labels that were shadowed. */
6908 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
6909 if (DECL_NAME (TREE_VALUE (link
)) != 0)
6910 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
6911 = TREE_VALUE (link
);
6913 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
6915 /* Stop pointing to the local nodes about to be freed. */
6916 /* But DECL_INITIAL must remain nonzero so we know this
6917 was an actual function definition. */
6918 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6919 DECL_ARGUMENTS (current_function_decl
) = 0;
6922 pop_function_context ();
6924 c_function_chain
= p
->next
;
6926 named_labels
= p
->named_labels
;
6927 shadowed_labels
= p
->shadowed_labels
;
6928 current_function_returns_value
= p
->returns_value
;
6929 current_function_returns_null
= p
->returns_null
;
6930 warn_about_return_type
= p
->warn_about_return_type
;
6931 current_extern_inline
= p
->extern_inline
;
6932 current_binding_level
= p
->binding_level
;
6937 /* integrate_decl_tree calls this function, but since we don't use the
6938 DECL_LANG_SPECIFIC field, this is a no-op. */
6941 copy_lang_decl (node
)