1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL
, /* Ordinary declaration */
40 FUNCDEF
, /* Function definition */
41 PARM
, /* Declaration of parm before function body */
42 FIELD
, /* Declaration inside struct or union */
43 BITFIELD
, /* Likewise but with specified width */
44 TYPENAME
}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node
;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node
;
111 tree integer_type_node
;
112 tree long_integer_type_node
;
113 tree long_long_integer_type_node
;
115 tree short_unsigned_type_node
;
116 tree unsigned_type_node
;
117 tree long_unsigned_type_node
;
118 tree long_long_unsigned_type_node
;
120 tree boolean_type_node
;
121 tree boolean_false_node
;
122 tree boolean_true_node
;
124 tree ptrdiff_type_node
;
126 tree unsigned_char_type_node
;
127 tree signed_char_type_node
;
129 tree wchar_type_node
;
130 tree signed_wchar_type_node
;
131 tree unsigned_wchar_type_node
;
133 tree float_type_node
;
134 tree double_type_node
;
135 tree long_double_type_node
;
137 tree complex_integer_type_node
;
138 tree complex_float_type_node
;
139 tree complex_double_type_node
;
140 tree complex_long_double_type_node
;
142 tree intQI_type_node
;
143 tree intHI_type_node
;
144 tree intSI_type_node
;
145 tree intDI_type_node
;
146 tree intTI_type_node
;
148 tree unsigned_intQI_type_node
;
149 tree unsigned_intHI_type_node
;
150 tree unsigned_intSI_type_node
;
151 tree unsigned_intDI_type_node
;
152 tree unsigned_intTI_type_node
;
154 /* a VOID_TYPE node. */
158 /* Nodes for types `void *' and `const void *'. */
160 tree ptr_type_node
, const_ptr_type_node
;
162 /* Nodes for types `char *' and `const char *'. */
164 tree string_type_node
, const_string_type_node
;
166 /* Type `char[SOMENUMBER]'.
167 Used when an array of char is needed and the size is irrelevant. */
169 tree char_array_type_node
;
171 /* Type `int[SOMENUMBER]' or something like it.
172 Used when an array of int needed and the size is irrelevant. */
174 tree int_array_type_node
;
176 /* Type `wchar_t[SOMENUMBER]' or something like it.
177 Used when a wide string literal is created. */
179 tree wchar_array_type_node
;
181 /* type `int ()' -- used for implicit declaration of functions. */
183 tree default_function_type
;
185 /* function types `double (double)' and `double (double, double)', etc. */
187 tree double_ftype_double
, double_ftype_double_double
;
188 tree int_ftype_int
, long_ftype_long
;
189 tree float_ftype_float
;
190 tree ldouble_ftype_ldouble
;
192 /* Function type `void (void *, void *, int)' and similar ones */
194 tree void_ftype_ptr_ptr_int
, int_ftype_ptr_ptr_int
, void_ftype_ptr_int_int
;
196 /* Function type `char *(char *, char *)' and similar ones */
197 tree string_ftype_ptr_ptr
, int_ftype_string_string
;
199 /* Function type `int (const void *, const void *, size_t)' */
200 tree int_ftype_cptr_cptr_sizet
;
202 /* Two expressions that are constants with value zero.
203 The first is of type `int', the second of type `void *'. */
205 tree integer_zero_node
;
206 tree null_pointer_node
;
208 /* A node for the integer constant 1. */
210 tree integer_one_node
;
212 /* Nonzero if we have seen an invalid cross reference
213 to a struct, union, or enum, but not yet printed the message. */
215 tree pending_invalid_xref
;
216 /* File and line to appear in the eventual error message. */
217 char *pending_invalid_xref_file
;
218 int pending_invalid_xref_line
;
220 /* While defining an enum type, this is 1 plus the last enumerator
221 constant value. Note that will do not have to save this or `enum_overflow'
222 around nested function definition since such a definition could only
223 occur in an enum value expression and we don't use these variables in
226 static tree enum_next_value
;
228 /* Nonzero means that there was overflow computing enum_next_value. */
230 static int enum_overflow
;
232 /* Parsing a function declarator leaves a list of parameter names
233 or a chain or parameter decls here. */
235 static tree last_function_parms
;
237 /* Parsing a function declarator leaves here a chain of structure
238 and enum types declared in the parmlist. */
240 static tree last_function_parm_tags
;
242 /* After parsing the declarator that starts a function definition,
243 `start_function' puts here the list of parameter names or chain of decls.
244 `store_parm_decls' finds it here. */
246 static tree current_function_parms
;
248 /* Similar, for last_function_parm_tags. */
249 static tree current_function_parm_tags
;
251 /* Similar, for the file and line that the prototype came from if this is
252 an old-style definition. */
253 static char *current_function_prototype_file
;
254 static int current_function_prototype_line
;
256 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
257 that have names. Here so we can clear out their names' definitions
258 at the end of the function. */
260 static tree named_labels
;
262 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
264 static tree shadowed_labels
;
266 /* Nonzero when store_parm_decls is called indicates a varargs function.
267 Value not meaningful after store_parm_decls. */
269 static int c_function_varargs
;
271 /* The FUNCTION_DECL for the function currently being compiled,
272 or 0 if between functions. */
273 tree current_function_decl
;
275 /* Set to 0 at beginning of a function definition, set to 1 if
276 a return statement that specifies a return value is seen. */
278 int current_function_returns_value
;
280 /* Set to 0 at beginning of a function definition, set to 1 if
281 a return statement with no argument is seen. */
283 int current_function_returns_null
;
285 /* Set to nonzero by `grokdeclarator' for a function
286 whose return type is defaulted, if warnings for this are desired. */
288 static int warn_about_return_type
;
290 /* Nonzero when starting a function declared `extern inline'. */
292 static int current_extern_inline
;
294 /* For each binding contour we allocate a binding_level structure
295 * which records the names defined in that contour.
298 * 1) one for each function definition,
299 * where internal declarations of the parameters appear.
300 * 2) one for each compound statement,
301 * to record its declarations.
303 * The current meaning of a name can be found by searching the levels from
304 * the current one out to the global one.
307 /* Note that the information in the `names' component of the global contour
308 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
312 /* A chain of _DECL nodes for all variables, constants, functions,
313 and typedef types. These are in the reverse of the order supplied.
317 /* A list of structure, union and enum definitions,
318 * for looking up tag names.
319 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
320 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
321 * or ENUMERAL_TYPE node.
325 /* For each level, a list of shadowed outer-level local definitions
326 to be restored when this level is popped.
327 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
328 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
331 /* For each level (except not the global one),
332 a chain of BLOCK nodes for all the levels
333 that were entered and exited one level down. */
336 /* The BLOCK node for this level, if one has been preallocated.
337 If 0, the BLOCK is allocated (if needed) when the level is popped. */
340 /* The binding level which this one is contained in (inherits from). */
341 struct binding_level
*level_chain
;
343 /* Nonzero for the level that holds the parameters of a function. */
346 /* Nonzero if this level "doesn't exist" for tags. */
347 char tag_transparent
;
349 /* Nonzero if sublevels of this level "don't exist" for tags.
350 This is set in the parm level of a function definition
351 while reading the function body, so that the outermost block
352 of the function body will be tag-transparent. */
353 char subblocks_tag_transparent
;
355 /* Nonzero means make a BLOCK for this level regardless of all else. */
358 /* Nonzero means make a BLOCK if this level has any subblocks. */
359 char keep_if_subblocks
;
361 /* Number of decls in `names' that have incomplete
362 structure or union types. */
365 /* A list of decls giving the (reversed) specified order of parms,
366 not including any forward-decls in the parmlist.
367 This is so we can put the parms in proper order for assign_parms. */
371 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
373 /* The binding level currently in effect. */
375 static struct binding_level
*current_binding_level
;
377 /* A chain of binding_level structures awaiting reuse. */
379 static struct binding_level
*free_binding_level
;
381 /* The outermost binding level, for names of file scope.
382 This is created when the compiler is started and exists
383 through the entire run. */
385 static struct binding_level
*global_binding_level
;
387 /* Binding level structures are initialized by copying this one. */
389 static struct binding_level clear_binding_level
390 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
393 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
395 static int keep_next_level_flag
;
397 /* Nonzero means make a BLOCK for the next level pushed
398 if it has subblocks. */
400 static int keep_next_if_subblocks
;
402 /* The chain of outer levels of label scopes.
403 This uses the same data structure used for binding levels,
404 but it works differently: each link in the chain records
405 saved values of named_labels and shadowed_labels for
406 a label binding level outside the current one. */
408 static struct binding_level
*label_level_chain
;
410 /* Functions called automatically at the beginning and end of execution. */
412 tree static_ctors
, static_dtors
;
414 /* Forward declarations. */
416 static struct binding_level
* make_binding_level
PROTO((void));
417 static void clear_limbo_values
PROTO((tree
));
418 static int duplicate_decls
PROTO((tree
, tree
, int));
419 static char *redeclaration_error_message
PROTO((tree
, tree
));
420 static void storedecls
PROTO((tree
));
421 static void storetags
PROTO((tree
));
422 static tree lookup_tag
PROTO((enum tree_code
, tree
,
423 struct binding_level
*, int));
424 static tree lookup_tag_reverse
PROTO((tree
));
425 static tree grokdeclarator
PROTO((tree
, tree
, enum decl_context
,
427 static tree grokparms
PROTO((tree
, int));
428 static int field_decl_cmp
PROTO((const GENERIC_PTR
, const GENERIC_PTR
));
429 static void layout_array_type
PROTO((tree
));
431 /* C-specific option variables. */
433 /* Nonzero means allow type mismatches in conditional expressions;
434 just make their values `void'. */
436 int flag_cond_mismatch
;
438 /* Nonzero means give `double' the same size as `float'. */
440 int flag_short_double
;
442 /* Nonzero means don't recognize the keyword `asm'. */
446 /* Nonzero means don't recognize any builtin functions. */
450 /* Nonzero means don't recognize the non-ANSI builtin functions.
453 int flag_no_nonansi_builtin
;
455 /* Nonzero means do some things the same way PCC does. */
457 int flag_traditional
;
459 /* Nonzero means that we have builtin functions, and main is an int */
463 /* Nonzero means to allow single precision math even if we're generally
464 being traditional. */
465 int flag_allow_single_precision
= 0;
467 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
469 int flag_signed_bitfields
= 1;
470 int explicit_flag_signed_bitfields
= 0;
472 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
474 int flag_no_ident
= 0;
476 /* Nonzero means warn about use of implicit int. */
478 int warn_implicit_int
;
480 /* Nonzero means message about use of implicit function declarations;
481 1 means warning; 2 means error. */
483 int mesg_implicit_function_declaration
;
485 /* Nonzero means give string constants the type `const char *'
486 to get extra warnings from them. These warnings will be too numerous
487 to be useful, except in thoroughly ANSIfied programs. */
489 int warn_write_strings
;
491 /* Nonzero means warn about pointer casts that can drop a type qualifier
492 from the pointer target type. */
496 /* Nonzero means warn when casting a function call to a type that does
497 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
498 when there is no previous declaration of sqrt or malloc. */
500 int warn_bad_function_cast
;
502 /* Warn about traditional constructs whose meanings changed in ANSI C. */
504 int warn_traditional
;
506 /* Nonzero means warn about sizeof(function) or addition/subtraction
507 of function pointers. */
509 int warn_pointer_arith
;
511 /* Nonzero means warn for non-prototype function decls
512 or non-prototyped defs without previous prototype. */
514 int warn_strict_prototypes
;
516 /* Nonzero means warn for any global function def
517 without separate previous prototype decl. */
519 int warn_missing_prototypes
;
521 /* Nonzero means warn for any global function def
522 without separate previous decl. */
524 int warn_missing_declarations
;
526 /* Nonzero means warn about multiple (redundant) decls for the same single
527 variable or function. */
529 int warn_redundant_decls
= 0;
531 /* Nonzero means warn about extern declarations of objects not at
532 file-scope level and about *all* declarations of functions (whether
533 extern or static) not at file-scope level. Note that we exclude
534 implicit function declarations. To get warnings about those, use
537 int warn_nested_externs
= 0;
539 /* Warn about *printf or *scanf format/argument anomalies. */
543 /* Warn about a subscript that has type char. */
545 int warn_char_subscripts
= 0;
547 /* Warn if a type conversion is done that might have confusing results. */
551 /* Warn if adding () is suggested. */
553 int warn_parentheses
;
555 /* Warn if initializer is not completely bracketed. */
557 int warn_missing_braces
;
559 /* Warn if main is suspicious. */
563 /* Warn about #pragma directives that are not recognised. */
565 int warn_unknown_pragmas
= 0; /* Tri state variable. */
567 /* Warn about comparison of signed and unsigned values.
568 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
570 int warn_sign_compare
= -1;
572 /* Nonzero means `$' can be in an identifier. */
574 #ifndef DOLLARS_IN_IDENTIFIERS
575 #define DOLLARS_IN_IDENTIFIERS 1
577 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
579 /* Decode the string P as a language-specific option for C.
580 Return 1 if it is recognized (and handle it);
581 return 0 if not recognized. */
587 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
589 flag_traditional
= 1;
590 flag_writable_strings
= 1;
592 else if (!strcmp (p
, "-fallow-single-precision"))
593 flag_allow_single_precision
= 1;
594 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
599 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
603 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
607 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
609 flag_traditional
= 0;
610 flag_writable_strings
= 0;
612 else if (!strcmp (p
, "-fdollars-in-identifiers"))
613 dollars_in_ident
= 1;
614 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
615 dollars_in_ident
= 0;
616 else if (!strcmp (p
, "-fsigned-char"))
617 flag_signed_char
= 1;
618 else if (!strcmp (p
, "-funsigned-char"))
619 flag_signed_char
= 0;
620 else if (!strcmp (p
, "-fno-signed-char"))
621 flag_signed_char
= 0;
622 else if (!strcmp (p
, "-fno-unsigned-char"))
623 flag_signed_char
= 1;
624 else if (!strcmp (p
, "-fsigned-bitfields")
625 || !strcmp (p
, "-fno-unsigned-bitfields"))
627 flag_signed_bitfields
= 1;
628 explicit_flag_signed_bitfields
= 1;
630 else if (!strcmp (p
, "-funsigned-bitfields")
631 || !strcmp (p
, "-fno-signed-bitfields"))
633 flag_signed_bitfields
= 0;
634 explicit_flag_signed_bitfields
= 1;
636 else if (!strcmp (p
, "-fshort-enums"))
637 flag_short_enums
= 1;
638 else if (!strcmp (p
, "-fno-short-enums"))
639 flag_short_enums
= 0;
640 else if (!strcmp (p
, "-fcond-mismatch"))
641 flag_cond_mismatch
= 1;
642 else if (!strcmp (p
, "-fno-cond-mismatch"))
643 flag_cond_mismatch
= 0;
644 else if (!strcmp (p
, "-fshort-double"))
645 flag_short_double
= 1;
646 else if (!strcmp (p
, "-fno-short-double"))
647 flag_short_double
= 0;
648 else if (!strcmp (p
, "-fasm"))
650 else if (!strcmp (p
, "-fno-asm"))
652 else if (!strcmp (p
, "-fbuiltin"))
654 else if (!strcmp (p
, "-fno-builtin"))
656 else if (!strcmp (p
, "-fno-ident"))
658 else if (!strcmp (p
, "-fident"))
660 else if (!strcmp (p
, "-ansi"))
661 flag_no_asm
= 1, flag_no_nonansi_builtin
= 1;
662 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
663 mesg_implicit_function_declaration
= 2;
664 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
665 mesg_implicit_function_declaration
= 1;
666 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
667 mesg_implicit_function_declaration
= 0;
668 else if (!strcmp (p
, "-Wimplicit-int"))
669 warn_implicit_int
= 1;
670 else if (!strcmp (p
, "-Wno-implicit-int"))
671 warn_implicit_int
= 0;
672 else if (!strcmp (p
, "-Wimplicit"))
674 warn_implicit_int
= 1;
675 if (mesg_implicit_function_declaration
!= 2)
676 mesg_implicit_function_declaration
= 1;
678 else if (!strcmp (p
, "-Wno-implicit"))
679 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
680 else if (!strcmp (p
, "-Wwrite-strings"))
681 warn_write_strings
= 1;
682 else if (!strcmp (p
, "-Wno-write-strings"))
683 warn_write_strings
= 0;
684 else if (!strcmp (p
, "-Wcast-qual"))
686 else if (!strcmp (p
, "-Wno-cast-qual"))
688 else if (!strcmp (p
, "-Wbad-function-cast"))
689 warn_bad_function_cast
= 1;
690 else if (!strcmp (p
, "-Wno-bad-function-cast"))
691 warn_bad_function_cast
= 0;
692 else if (!strcmp (p
, "-Wpointer-arith"))
693 warn_pointer_arith
= 1;
694 else if (!strcmp (p
, "-Wno-pointer-arith"))
695 warn_pointer_arith
= 0;
696 else if (!strcmp (p
, "-Wstrict-prototypes"))
697 warn_strict_prototypes
= 1;
698 else if (!strcmp (p
, "-Wno-strict-prototypes"))
699 warn_strict_prototypes
= 0;
700 else if (!strcmp (p
, "-Wmissing-prototypes"))
701 warn_missing_prototypes
= 1;
702 else if (!strcmp (p
, "-Wno-missing-prototypes"))
703 warn_missing_prototypes
= 0;
704 else if (!strcmp (p
, "-Wmissing-declarations"))
705 warn_missing_declarations
= 1;
706 else if (!strcmp (p
, "-Wno-missing-declarations"))
707 warn_missing_declarations
= 0;
708 else if (!strcmp (p
, "-Wredundant-decls"))
709 warn_redundant_decls
= 1;
710 else if (!strcmp (p
, "-Wno-redundant-decls"))
711 warn_redundant_decls
= 0;
712 else if (!strcmp (p
, "-Wnested-externs"))
713 warn_nested_externs
= 1;
714 else if (!strcmp (p
, "-Wno-nested-externs"))
715 warn_nested_externs
= 0;
716 else if (!strcmp (p
, "-Wtraditional"))
717 warn_traditional
= 1;
718 else if (!strcmp (p
, "-Wno-traditional"))
719 warn_traditional
= 0;
720 else if (!strcmp (p
, "-Wformat"))
722 else if (!strcmp (p
, "-Wno-format"))
724 else if (!strcmp (p
, "-Wchar-subscripts"))
725 warn_char_subscripts
= 1;
726 else if (!strcmp (p
, "-Wno-char-subscripts"))
727 warn_char_subscripts
= 0;
728 else if (!strcmp (p
, "-Wconversion"))
730 else if (!strcmp (p
, "-Wno-conversion"))
732 else if (!strcmp (p
, "-Wparentheses"))
733 warn_parentheses
= 1;
734 else if (!strcmp (p
, "-Wno-parentheses"))
735 warn_parentheses
= 0;
736 else if (!strcmp (p
, "-Wreturn-type"))
737 warn_return_type
= 1;
738 else if (!strcmp (p
, "-Wno-return-type"))
739 warn_return_type
= 0;
740 else if (!strcmp (p
, "-Wcomment"))
741 ; /* cpp handles this one. */
742 else if (!strcmp (p
, "-Wno-comment"))
743 ; /* cpp handles this one. */
744 else if (!strcmp (p
, "-Wcomments"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p
, "-Wno-comments"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p
, "-Wtrigraphs"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p
, "-Wno-trigraphs"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p
, "-Wundef"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p
, "-Wno-undef"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p
, "-Wimport"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p
, "-Wno-import"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p
, "-Wmissing-braces"))
761 warn_missing_braces
= 1;
762 else if (!strcmp (p
, "-Wno-missing-braces"))
763 warn_missing_braces
= 0;
764 else if (!strcmp (p
, "-Wmain"))
766 else if (!strcmp (p
, "-Wno-main"))
768 else if (!strcmp (p
, "-Wsign-compare"))
769 warn_sign_compare
= 1;
770 else if (!strcmp (p
, "-Wno-sign-compare"))
771 warn_sign_compare
= 0;
772 else if (!strcmp (p
, "-Wunknown-pragmas"))
773 /* Set to greater than 1, so that even unknown pragmas in system
774 headers will be warned about. */
775 warn_unknown_pragmas
= 2;
776 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
777 warn_unknown_pragmas
= 0;
778 else if (!strcmp (p
, "-Wall"))
780 /* We save the value of warn_uninitialized, since if they put
781 -Wuninitialized on the command line, we need to generate a
782 warning about not using it without also specifying -O. */
783 if (warn_uninitialized
!= 1)
784 warn_uninitialized
= 2;
785 warn_implicit_int
= 1;
786 mesg_implicit_function_declaration
= 1;
787 warn_return_type
= 1;
791 warn_char_subscripts
= 1;
792 warn_parentheses
= 1;
793 warn_missing_braces
= 1;
794 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
795 it off only if it's not explicit. */
797 /* Only warn about unknown pragmas that are not in system headers. */
798 warn_unknown_pragmas
= 1;
806 /* Hooks for print_node. */
809 print_lang_decl (file
, node
, indent
)
817 print_lang_type (file
, node
, indent
)
825 print_lang_identifier (file
, node
, indent
)
830 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
831 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
832 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
833 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
834 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
835 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
838 /* Hook called at end of compilation to assume 1 elt
839 for a top-level array decl that wasn't complete before. */
842 finish_incomplete_decl (decl
)
845 if (TREE_CODE (decl
) == VAR_DECL
)
847 tree type
= TREE_TYPE (decl
);
848 if (type
!= error_mark_node
849 && TREE_CODE (type
) == ARRAY_TYPE
850 && TYPE_DOMAIN (type
) == 0)
852 if (! DECL_EXTERNAL (decl
))
853 warning_with_decl (decl
, "array `%s' assumed to have one element");
855 complete_array_type (type
, NULL_TREE
, 1);
857 layout_decl (decl
, 0);
862 /* Create a new `struct binding_level'. */
865 struct binding_level
*
866 make_binding_level ()
869 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
872 /* Nonzero if we are currently in the global binding level. */
877 return current_binding_level
== global_binding_level
;
883 keep_next_level_flag
= 1;
886 /* Nonzero if the current level needs to have a BLOCK made. */
891 return ((current_binding_level
->keep_if_subblocks
892 && current_binding_level
->blocks
!= 0)
893 || current_binding_level
->keep
894 || current_binding_level
->names
!= 0
895 || (current_binding_level
->tags
!= 0
896 && !current_binding_level
->tag_transparent
));
899 /* Identify this binding level as a level of parameters.
900 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
901 But it turns out there is no way to pass the right value for
902 DEFINITION_FLAG, so we ignore it. */
905 declare_parm_level (definition_flag
)
908 current_binding_level
->parm_flag
= 1;
911 /* Nonzero if currently making parm declarations. */
916 return current_binding_level
->parm_flag
;
919 /* Enter a new binding level.
920 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
921 not for that of tags. */
924 pushlevel (tag_transparent
)
927 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
929 /* If this is the top level of a function,
930 just make sure that NAMED_LABELS is 0. */
932 if (current_binding_level
== global_binding_level
)
937 /* Reuse or create a struct for this binding level. */
939 if (free_binding_level
)
941 newlevel
= free_binding_level
;
942 free_binding_level
= free_binding_level
->level_chain
;
946 newlevel
= make_binding_level ();
949 /* Add this level to the front of the chain (stack) of levels that
952 *newlevel
= clear_binding_level
;
953 newlevel
->tag_transparent
955 || (current_binding_level
956 ? current_binding_level
->subblocks_tag_transparent
958 newlevel
->level_chain
= current_binding_level
;
959 current_binding_level
= newlevel
;
960 newlevel
->keep
= keep_next_level_flag
;
961 keep_next_level_flag
= 0;
962 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
963 keep_next_if_subblocks
= 0;
966 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
969 clear_limbo_values (block
)
974 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
975 if (DECL_NAME (tem
) != 0)
976 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
978 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
979 clear_limbo_values (tem
);
982 /* Exit a binding level.
983 Pop the level off, and restore the state of the identifier-decl mappings
984 that were in effect when this level was entered.
986 If KEEP is nonzero, this level had explicit declarations, so
987 and create a "block" (a BLOCK node) for the level
988 to record its declarations and subblocks for symbol table output.
990 If FUNCTIONBODY is nonzero, this level is the body of a function,
991 so create a block as if KEEP were set and also clear out all
994 If REVERSE is nonzero, reverse the order of decls before putting
995 them into the BLOCK. */
998 poplevel (keep
, reverse
, functionbody
)
1004 /* The chain of decls was accumulated in reverse order.
1005 Put it into forward order, just for cleanliness. */
1007 tree tags
= current_binding_level
->tags
;
1008 tree subblocks
= current_binding_level
->blocks
;
1011 int block_previously_created
;
1013 keep
|= current_binding_level
->keep
;
1015 /* This warning is turned off because it causes warnings for
1016 declarations like `extern struct foo *x'. */
1018 /* Warn about incomplete structure types in this level. */
1019 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1020 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
1022 tree type
= TREE_VALUE (link
);
1024 switch (TREE_CODE (type
))
1027 errmsg
= "`struct %s' incomplete in scope ending here";
1030 errmsg
= "`union %s' incomplete in scope ending here";
1033 errmsg
= "`enum %s' incomplete in scope ending here";
1036 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
1037 error (errmsg
, IDENTIFIER_POINTER (TYPE_NAME (type
)));
1039 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1040 error (errmsg
, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
))));
1044 /* Get the decls in the order they were written.
1045 Usually current_binding_level->names is in reverse order.
1046 But parameter decls were previously put in forward order. */
1049 current_binding_level
->names
1050 = decls
= nreverse (current_binding_level
->names
);
1052 decls
= current_binding_level
->names
;
1054 /* Output any nested inline functions within this block
1055 if they weren't already output. */
1057 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1058 if (TREE_CODE (decl
) == FUNCTION_DECL
1059 && ! TREE_ASM_WRITTEN (decl
)
1060 && DECL_INITIAL (decl
) != 0
1061 && TREE_ADDRESSABLE (decl
))
1063 /* If this decl was copied from a file-scope decl
1064 on account of a block-scope extern decl,
1065 propagate TREE_ADDRESSABLE to the file-scope decl.
1067 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1068 true, since then the decl goes through save_for_inline_copying. */
1069 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1070 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1071 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1072 else if (DECL_SAVED_INSNS (decl
) != 0)
1074 push_function_context ();
1075 output_inline_function (decl
);
1076 pop_function_context ();
1080 /* If there were any declarations or structure tags in that level,
1081 or if this level is a function body,
1082 create a BLOCK to record them for the life of this function. */
1085 block_previously_created
= (current_binding_level
->this_block
!= 0);
1086 if (block_previously_created
)
1087 block
= current_binding_level
->this_block
;
1088 else if (keep
|| functionbody
1089 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1090 block
= make_node (BLOCK
);
1093 BLOCK_VARS (block
) = decls
;
1094 BLOCK_TYPE_TAGS (block
) = tags
;
1095 BLOCK_SUBBLOCKS (block
) = subblocks
;
1096 remember_end_note (block
);
1099 /* In each subblock, record that this is its superior. */
1101 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1102 BLOCK_SUPERCONTEXT (link
) = block
;
1104 /* Clear out the meanings of the local variables of this level. */
1106 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1108 if (DECL_NAME (link
) != 0)
1110 /* If the ident. was used or addressed via a local extern decl,
1111 don't forget that fact. */
1112 if (DECL_EXTERNAL (link
))
1114 if (TREE_USED (link
))
1115 TREE_USED (DECL_NAME (link
)) = 1;
1116 if (TREE_ADDRESSABLE (link
))
1117 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1119 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1123 /* Restore all name-meanings of the outer levels
1124 that were shadowed by this level. */
1126 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1127 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1129 /* If the level being exited is the top level of a function,
1130 check over all the labels, and clear out the current
1131 (function local) meanings of their names. */
1135 clear_limbo_values (block
);
1137 /* If this is the top level block of a function,
1138 the vars are the function's parameters.
1139 Don't leave them in the BLOCK because they are
1140 found in the FUNCTION_DECL instead. */
1142 BLOCK_VARS (block
) = 0;
1144 /* Clear out the definitions of all label names,
1145 since their scopes end here,
1146 and add them to BLOCK_VARS. */
1148 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1150 register tree label
= TREE_VALUE (link
);
1152 if (DECL_INITIAL (label
) == 0)
1154 error_with_decl (label
, "label `%s' used but not defined");
1155 /* Avoid crashing later. */
1156 define_label (input_filename
, lineno
,
1159 else if (warn_unused
&& !TREE_USED (label
))
1160 warning_with_decl (label
, "label `%s' defined but not used");
1161 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1163 /* Put the labels into the "variables" of the
1164 top-level block, so debugger can see them. */
1165 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1166 BLOCK_VARS (block
) = label
;
1170 /* Pop the current level, and free the structure for reuse. */
1173 register struct binding_level
*level
= current_binding_level
;
1174 current_binding_level
= current_binding_level
->level_chain
;
1176 level
->level_chain
= free_binding_level
;
1177 free_binding_level
= level
;
1180 /* Dispose of the block that we just made inside some higher level. */
1182 DECL_INITIAL (current_function_decl
) = block
;
1185 if (!block_previously_created
)
1186 current_binding_level
->blocks
1187 = chainon (current_binding_level
->blocks
, block
);
1189 /* If we did not make a block for the level just exited,
1190 any blocks made for inner levels
1191 (since they cannot be recorded as subblocks in that level)
1192 must be carried forward so they will later become subblocks
1193 of something else. */
1195 current_binding_level
->blocks
1196 = chainon (current_binding_level
->blocks
, subblocks
);
1198 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1199 binding contour so that they point to the appropriate construct, i.e.
1200 either to the current FUNCTION_DECL node, or else to the BLOCK node
1201 we just constructed.
1203 Note that for tagged types whose scope is just the formal parameter
1204 list for some function type specification, we can't properly set
1205 their TYPE_CONTEXTs here, because we don't have a pointer to the
1206 appropriate FUNCTION_TYPE node readily available to us. For those
1207 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1208 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1209 node which will represent the "scope" for these "parameter list local"
1214 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1215 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1217 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1218 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1221 TREE_USED (block
) = 1;
1225 /* Delete the node BLOCK from the current binding level.
1226 This is used for the block inside a stmt expr ({...})
1227 so that the block can be reinserted where appropriate. */
1230 delete_block (block
)
1234 if (current_binding_level
->blocks
== block
)
1235 current_binding_level
->blocks
= TREE_CHAIN (block
);
1236 for (t
= current_binding_level
->blocks
; t
;)
1238 if (TREE_CHAIN (t
) == block
)
1239 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1243 TREE_CHAIN (block
) = NULL
;
1244 /* Clear TREE_USED which is always set by poplevel.
1245 The flag is set again if insert_block is called. */
1246 TREE_USED (block
) = 0;
1249 /* Insert BLOCK at the end of the list of subblocks of the
1250 current binding level. This is used when a BIND_EXPR is expanded,
1251 to handle the BLOCK node inside the BIND_EXPR. */
1254 insert_block (block
)
1257 TREE_USED (block
) = 1;
1258 current_binding_level
->blocks
1259 = chainon (current_binding_level
->blocks
, block
);
1262 /* Set the BLOCK node for the innermost scope
1263 (the one we are currently in). */
1267 register tree block
;
1269 current_binding_level
->this_block
= block
;
1275 register struct binding_level
*newlevel
;
1277 /* Reuse or create a struct for this binding level. */
1279 if (free_binding_level
)
1281 newlevel
= free_binding_level
;
1282 free_binding_level
= free_binding_level
->level_chain
;
1286 newlevel
= make_binding_level ();
1289 /* Add this level to the front of the chain (stack) of label levels. */
1291 newlevel
->level_chain
= label_level_chain
;
1292 label_level_chain
= newlevel
;
1294 newlevel
->names
= named_labels
;
1295 newlevel
->shadowed
= shadowed_labels
;
1297 shadowed_labels
= 0;
1303 register struct binding_level
*level
= label_level_chain
;
1306 /* Clear out the definitions of the declared labels in this level.
1307 Leave in the list any ordinary, non-declared labels. */
1308 for (link
= named_labels
, prev
= 0; link
;)
1310 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1312 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1314 error_with_decl (TREE_VALUE (link
),
1315 "label `%s' used but not defined");
1316 /* Avoid crashing later. */
1317 define_label (input_filename
, lineno
,
1318 DECL_NAME (TREE_VALUE (link
)));
1320 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1321 warning_with_decl (TREE_VALUE (link
),
1322 "label `%s' defined but not used");
1323 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1325 /* Delete this element from the list. */
1326 link
= TREE_CHAIN (link
);
1328 TREE_CHAIN (prev
) = link
;
1330 named_labels
= link
;
1335 link
= TREE_CHAIN (link
);
1339 /* Bring back all the labels that were shadowed. */
1340 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1341 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1342 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1343 = TREE_VALUE (link
);
1345 named_labels
= chainon (named_labels
, level
->names
);
1346 shadowed_labels
= level
->shadowed
;
1348 /* Pop the current level, and free the structure for reuse. */
1349 label_level_chain
= label_level_chain
->level_chain
;
1350 level
->level_chain
= free_binding_level
;
1351 free_binding_level
= level
;
1354 /* Push a definition or a declaration of struct, union or enum tag "name".
1355 "type" should be the type node.
1356 We assume that the tag "name" is not already defined.
1358 Note that the definition may really be just a forward reference.
1359 In that case, the TYPE_SIZE will be zero. */
1362 pushtag (name
, type
)
1365 register struct binding_level
*b
;
1367 /* Find the proper binding level for this type tag. */
1369 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1374 /* Record the identifier as the type's name if it has none. */
1376 if (TYPE_NAME (type
) == 0)
1377 TYPE_NAME (type
) = name
;
1380 if (b
== global_binding_level
)
1381 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1383 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1385 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1386 tagged type we just added to the current binding level. This fake
1387 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1388 to output a representation of a tagged type, and it also gives
1389 us a convenient place to record the "scope start" address for the
1392 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1394 /* An approximation for now, so we can tell this is a function-scope tag.
1395 This will be updated in poplevel. */
1396 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1399 /* Handle when a new declaration NEWDECL
1400 has the same name as an old one OLDDECL
1401 in the same binding contour.
1402 Prints an error message if appropriate.
1404 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1405 Otherwise, return 0.
1407 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1408 and OLDDECL is in an outer binding level and should thus not be changed. */
1411 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1412 register tree newdecl
, olddecl
;
1413 int different_binding_level
;
1415 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1416 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1417 && DECL_INITIAL (newdecl
) != 0);
1418 tree oldtype
= TREE_TYPE (olddecl
);
1419 tree newtype
= TREE_TYPE (newdecl
);
1422 if (TREE_CODE_CLASS (TREE_CODE (olddecl
)) == 'd')
1423 DECL_MACHINE_ATTRIBUTES (newdecl
)
1424 = merge_machine_decl_attributes (olddecl
, newdecl
);
1426 if (TREE_CODE (newtype
) == ERROR_MARK
1427 || TREE_CODE (oldtype
) == ERROR_MARK
)
1430 /* New decl is completely inconsistent with the old one =>
1431 tell caller to replace the old one.
1432 This is always an error except in the case of shadowing a builtin. */
1433 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1435 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1436 && (DECL_BUILT_IN (olddecl
)
1437 || DECL_BUILT_IN_NONANSI (olddecl
)))
1439 /* If you declare a built-in or predefined function name as static,
1440 the old definition is overridden,
1441 but optionally warn this was a bad choice of name. */
1442 if (!TREE_PUBLIC (newdecl
))
1446 else if (DECL_BUILT_IN (olddecl
))
1447 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1449 warning_with_decl (newdecl
, "shadowing library function `%s'");
1451 /* Likewise, if the built-in is not ansi, then programs can
1452 override it even globally without an error. */
1453 else if (! DECL_BUILT_IN (olddecl
))
1454 warning_with_decl (newdecl
,
1455 "library function `%s' declared as non-function");
1457 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1458 warning_with_decl (newdecl
,
1459 "built-in function `%s' declared as non-function");
1461 warning_with_decl (newdecl
,
1462 "built-in function `%s' declared as non-function");
1466 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1467 error_with_decl (olddecl
, "previous declaration of `%s'");
1473 /* For real parm decl following a forward decl,
1474 return 1 so old decl will be reused. */
1475 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1476 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1479 /* The new declaration is the same kind of object as the old one.
1480 The declarations may partially match. Print warnings if they don't
1481 match enough. Ultimately, copy most of the information from the new
1482 decl to the old one, and keep using the old one. */
1484 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1485 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1486 && DECL_INITIAL (olddecl
) == 0)
1487 /* If -traditional, avoid error for redeclaring fcn
1488 after implicit decl. */
1490 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1491 && DECL_BUILT_IN (olddecl
))
1493 /* A function declaration for a built-in function. */
1494 if (!TREE_PUBLIC (newdecl
))
1496 /* If you declare a built-in function name as static, the
1497 built-in definition is overridden,
1498 but optionally warn this was a bad choice of name. */
1500 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1501 /* Discard the old built-in function. */
1504 else if (!types_match
)
1506 /* Accept the return type of the new declaration if same modes. */
1507 tree oldreturntype
= TREE_TYPE (oldtype
);
1508 tree newreturntype
= TREE_TYPE (newtype
);
1510 /* Make sure we put the new type in the same obstack as the old ones.
1511 If the old types are not both in the same obstack, use the
1513 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1514 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1517 push_obstacks_nochange ();
1518 end_temporary_allocation ();
1521 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1523 /* Function types may be shared, so we can't just modify
1524 the return type of olddecl's function type. */
1526 = build_function_type (newreturntype
,
1527 TYPE_ARG_TYPES (oldtype
));
1529 types_match
= comptypes (newtype
, trytype
);
1533 /* Accept harmless mismatch in first argument type also.
1535 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1536 && TYPE_ARG_TYPES (oldtype
) != 0
1537 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1538 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1539 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1540 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1542 /* Function types may be shared, so we can't just modify
1543 the return type of olddecl's function type. */
1545 = build_function_type (TREE_TYPE (oldtype
),
1546 tree_cons (NULL_TREE
,
1547 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1548 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1550 types_match
= comptypes (newtype
, trytype
);
1554 if (! different_binding_level
)
1555 TREE_TYPE (olddecl
) = oldtype
;
1561 /* If types don't match for a built-in, throw away the built-in. */
1562 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1566 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1567 && DECL_SOURCE_LINE (olddecl
) == 0)
1569 /* A function declaration for a predeclared function
1570 that isn't actually built in. */
1571 if (!TREE_PUBLIC (newdecl
))
1573 /* If you declare it as static, the
1574 default definition is overridden. */
1577 else if (!types_match
)
1579 /* If the types don't match, preserve volatility indication.
1580 Later on, we will discard everything else about the
1581 default declaration. */
1582 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1585 /* Permit char *foo () to match void *foo (...) if not pedantic,
1586 if one of them came from a system header file. */
1587 else if (!types_match
1588 && TREE_CODE (olddecl
) == FUNCTION_DECL
1589 && TREE_CODE (newdecl
) == FUNCTION_DECL
1590 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1591 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1592 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1593 || DECL_IN_SYSTEM_HEADER (newdecl
))
1594 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1595 && TYPE_ARG_TYPES (oldtype
) == 0
1596 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1597 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1599 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1600 && TYPE_ARG_TYPES (newtype
) == 0
1601 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1602 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1605 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1606 /* Make sure we keep void * as ret type, not char *. */
1607 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1608 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1610 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1611 we will come back here again. */
1612 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1614 else if (!types_match
1615 /* Permit char *foo (int, ...); followed by char *foo ();
1617 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1619 /* Return types must still match. */
1620 && comptypes (TREE_TYPE (oldtype
),
1621 TREE_TYPE (newtype
))
1622 && TYPE_ARG_TYPES (newtype
) == 0))
1624 error_with_decl (newdecl
, "conflicting types for `%s'");
1625 /* Check for function type mismatch
1626 involving an empty arglist vs a nonempty one. */
1627 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1628 && comptypes (TREE_TYPE (oldtype
),
1629 TREE_TYPE (newtype
))
1630 && ((TYPE_ARG_TYPES (oldtype
) == 0
1631 && DECL_INITIAL (olddecl
) == 0)
1633 (TYPE_ARG_TYPES (newtype
) == 0
1634 && DECL_INITIAL (newdecl
) == 0)))
1636 /* Classify the problem further. */
1637 register tree t
= TYPE_ARG_TYPES (oldtype
);
1639 t
= TYPE_ARG_TYPES (newtype
);
1640 for (; t
; t
= TREE_CHAIN (t
))
1642 register tree type
= TREE_VALUE (t
);
1644 if (TREE_CHAIN (t
) == 0
1645 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1647 error ("A parameter list with an ellipsis can't match");
1648 error ("an empty parameter name list declaration.");
1652 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1653 || C_PROMOTING_INTEGER_TYPE_P (type
))
1655 error ("An argument type that has a default promotion");
1656 error ("can't match an empty parameter name list declaration.");
1661 error_with_decl (olddecl
, "previous declaration of `%s'");
1665 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1668 error_with_decl (newdecl
, errmsg
);
1669 error_with_decl (olddecl
,
1670 ((DECL_INITIAL (olddecl
)
1671 && current_binding_level
== global_binding_level
)
1672 ? "`%s' previously defined here"
1673 : "`%s' previously declared here"));
1675 else if (TREE_CODE (newdecl
) == TYPE_DECL
1676 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1677 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1679 warning_with_decl (newdecl
, "redefinition of `%s'");
1682 ((DECL_INITIAL (olddecl
)
1683 && current_binding_level
== global_binding_level
)
1684 ? "`%s' previously defined here"
1685 : "`%s' previously declared here"));
1687 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1688 && DECL_INITIAL (olddecl
) != 0
1689 && TYPE_ARG_TYPES (oldtype
) == 0
1690 && TYPE_ARG_TYPES (newtype
) != 0
1691 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1693 register tree type
, parm
;
1695 /* Prototype decl follows defn w/o prototype. */
1697 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1698 type
= TYPE_ARG_TYPES (newtype
),
1700 (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) != void_type_node
1701 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
1702 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1704 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1705 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1707 errmsg
= "prototype for `%s' follows and number of arguments";
1710 /* Type for passing arg must be consistent
1711 with that declared for the arg. */
1712 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1713 /* If -traditional, allow `unsigned int' instead of `int'
1714 in the prototype. */
1715 && (! (flag_traditional
1716 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1717 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1719 errmsg
= "prototype for `%s' follows and argument %d";
1725 error_with_decl (newdecl
, errmsg
, nargs
);
1726 error_with_decl (olddecl
,
1727 "doesn't match non-prototype definition here");
1731 warning_with_decl (newdecl
, "prototype for `%s' follows");
1732 warning_with_decl (olddecl
, "non-prototype definition here");
1735 /* Warn about mismatches in various flags. */
1738 /* Warn if function is now inline
1739 but was previously declared not inline and has been called. */
1740 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1741 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1742 && TREE_USED (olddecl
))
1743 warning_with_decl (newdecl
,
1744 "`%s' declared inline after being called");
1745 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1746 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1747 && DECL_INITIAL (olddecl
) != 0)
1748 warning_with_decl (newdecl
,
1749 "`%s' declared inline after its definition");
1751 /* If pedantic, warn when static declaration follows a non-static
1752 declaration. Otherwise, do so only for functions. */
1753 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1754 && TREE_PUBLIC (olddecl
)
1755 && !TREE_PUBLIC (newdecl
))
1756 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1758 /* Warn when const declaration follows a non-const
1759 declaration, but not for functions. */
1760 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1761 && !TREE_READONLY (olddecl
)
1762 && TREE_READONLY (newdecl
))
1763 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1764 /* These bits are logically part of the type, for variables.
1765 But not for functions
1766 (where qualifiers are not valid ANSI anyway). */
1767 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1768 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1769 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1770 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1774 /* Optionally warn about more than one declaration for the same name. */
1775 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1776 /* Don't warn about a function declaration
1777 followed by a definition. */
1778 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1779 && DECL_INITIAL (olddecl
) == 0)
1780 /* Don't warn about extern decl followed by (tentative) definition. */
1781 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1783 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1784 warning_with_decl (olddecl
, "previous declaration of `%s'");
1787 /* Copy all the DECL_... slots specified in the new decl
1788 except for any that we copy here from the old type.
1790 Past this point, we don't change OLDTYPE and NEWTYPE
1791 even if we change the types of NEWDECL and OLDDECL. */
1795 /* When copying info to olddecl, we store into write_olddecl
1796 instead. This allows us to avoid modifying olddecl when
1797 different_binding_level is true. */
1798 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1800 /* Make sure we put the new type in the same obstack as the old ones.
1801 If the old types are not both in the same obstack, use the permanent
1803 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1804 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1807 push_obstacks_nochange ();
1808 end_temporary_allocation ();
1811 /* Merge the data types specified in the two decls. */
1812 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1814 if (different_binding_level
)
1816 = build_type_attribute_variant
1818 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1819 TYPE_ATTRIBUTES (oldtype
)));
1822 = TREE_TYPE (olddecl
)
1823 = common_type (newtype
, oldtype
);
1826 /* Lay the type out, unless already done. */
1827 if (oldtype
!= TREE_TYPE (newdecl
))
1829 if (TREE_TYPE (newdecl
) != error_mark_node
)
1830 layout_type (TREE_TYPE (newdecl
));
1831 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1832 && TREE_CODE (newdecl
) != TYPE_DECL
1833 && TREE_CODE (newdecl
) != CONST_DECL
)
1834 layout_decl (newdecl
, 0);
1838 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1839 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1840 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1841 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1842 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1845 /* Keep the old rtl since we can safely use it. */
1846 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1848 /* Merge the type qualifiers. */
1849 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1850 && !TREE_THIS_VOLATILE (newdecl
))
1851 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1852 if (TREE_READONLY (newdecl
))
1853 TREE_READONLY (write_olddecl
) = 1;
1854 if (TREE_THIS_VOLATILE (newdecl
))
1856 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1857 if (TREE_CODE (newdecl
) == VAR_DECL
)
1858 make_var_volatile (newdecl
);
1861 /* Keep source location of definition rather than declaration. */
1862 /* When called with different_binding_level set, keep the old
1863 information so that meaningful diagnostics can be given. */
1864 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1865 && ! different_binding_level
)
1867 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1868 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1871 /* Merge the unused-warning information. */
1872 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1873 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1874 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1875 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1877 /* Merge the initialization information. */
1878 /* When called with different_binding_level set, don't copy over
1879 DECL_INITIAL, so that we don't accidentally change function
1880 declarations into function definitions. */
1881 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1882 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1884 /* Merge the section attribute.
1885 We want to issue an error if the sections conflict but that must be
1886 done later in decl_attributes since we are called before attributes
1888 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1889 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1891 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1893 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1894 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1899 /* If cannot merge, then use the new type and qualifiers,
1900 and don't preserve the old rtl. */
1901 else if (! different_binding_level
)
1903 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1904 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1905 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1906 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1909 /* Merge the storage class information. */
1910 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1911 /* For functions, static overrides non-static. */
1912 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1914 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1915 /* This is since we don't automatically
1916 copy the attributes of NEWDECL into OLDDECL. */
1917 /* No need to worry about different_binding_level here because
1918 then TREE_PUBLIC (newdecl) was true. */
1919 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1920 /* If this clears `static', clear it in the identifier too. */
1921 if (! TREE_PUBLIC (olddecl
))
1922 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1924 if (DECL_EXTERNAL (newdecl
))
1926 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1927 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1928 /* An extern decl does not override previous storage class. */
1929 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1930 if (! DECL_EXTERNAL (newdecl
))
1931 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1935 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1936 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1939 /* If either decl says `inline', this fn is inline,
1940 unless its definition was passed already. */
1941 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1942 DECL_INLINE (olddecl
) = 1;
1943 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1945 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1947 if (DECL_BUILT_IN (olddecl
))
1949 /* Get rid of any built-in function if new arg types don't match it
1950 or if we have a function definition. */
1951 if (! types_match
|| new_is_definition
)
1953 if (! different_binding_level
)
1955 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1956 DECL_BUILT_IN (olddecl
) = 0;
1961 /* If redeclaring a builtin function, and not a definition,
1962 it stays built in. */
1963 DECL_BUILT_IN (newdecl
) = 1;
1964 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1967 /* Also preserve various other info from the definition. */
1968 else if (! new_is_definition
)
1969 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1970 if (! new_is_definition
)
1972 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1973 /* When called with different_binding_level set, don't copy over
1974 DECL_INITIAL, so that we don't accidentally change function
1975 declarations into function definitions. */
1976 if (! different_binding_level
)
1977 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1978 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1979 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1980 if (DECL_INLINE (newdecl
))
1981 DECL_ABSTRACT_ORIGIN (newdecl
) = olddecl
;
1984 if (different_binding_level
)
1986 /* Don't output a duplicate symbol or debugging information for this
1988 TREE_ASM_WRITTEN (newdecl
) = DECL_IGNORED_P (newdecl
) = 1;
1992 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1993 But preserve OLDDECL's DECL_UID. */
1995 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1997 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1998 (char *) olddecl
+ sizeof (struct tree_common
),
1999 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
2000 DECL_UID (olddecl
) = olddecl_uid
;
2003 /* NEWDECL contains the merged attribute lists.
2004 Update OLDDECL to be the same. */
2005 DECL_MACHINE_ATTRIBUTES (olddecl
) = DECL_MACHINE_ATTRIBUTES (newdecl
);
2010 /* Record a decl-node X as belonging to the current lexical scope.
2011 Check for errors (such as an incompatible declaration for the same
2012 name already seen in the same scope).
2014 Returns either X or an old decl for the same name.
2015 If an old decl is returned, it may have been smashed
2016 to agree with what X says. */
2023 register tree name
= DECL_NAME (x
);
2024 register struct binding_level
*b
= current_binding_level
;
2026 DECL_CONTEXT (x
) = current_function_decl
;
2027 /* A local extern declaration for a function doesn't constitute nesting.
2028 A local auto declaration does, since it's a forward decl
2029 for a nested function coming later. */
2030 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
2031 && DECL_EXTERNAL (x
))
2032 DECL_CONTEXT (x
) = 0;
2034 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
2035 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2036 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2037 && !DECL_IN_SYSTEM_HEADER (x
))
2038 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
2044 int different_binding_level
= 0;
2046 t
= lookup_name_current_level (name
);
2047 /* Don't type check externs here when -traditional. This is so that
2048 code with conflicting declarations inside blocks will get warnings
2049 not errors. X11 for instance depends on this. */
2050 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2052 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2053 /* Type decls at global scope don't conflict with externs declared
2054 inside lexical blocks. */
2055 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2057 different_binding_level
= 1;
2059 if (t
!= 0 && t
== error_mark_node
)
2060 /* error_mark_node is 0 for a while during initialization! */
2063 error_with_decl (x
, "`%s' used prior to declaration");
2068 file
= DECL_SOURCE_FILE (t
);
2069 line
= DECL_SOURCE_LINE (t
);
2072 /* If this decl is `static' and an implicit decl was seen previously,
2073 warn. But don't complain if -traditional,
2074 since traditional compilers don't complain. */
2075 if (! flag_traditional
&& TREE_PUBLIC (name
)
2076 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2077 sets this for all functions. */
2078 && ! TREE_PUBLIC (x
)
2079 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2080 /* We used to warn also for explicit extern followed by static,
2081 but sometimes you need to do it that way. */
2082 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2084 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2085 IDENTIFIER_POINTER (name
));
2086 pedwarn_with_file_and_line
2087 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2088 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2089 "previous declaration of `%s'",
2090 IDENTIFIER_POINTER (name
));
2091 TREE_THIS_VOLATILE (name
) = 1;
2094 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2096 if (TREE_CODE (t
) == PARM_DECL
)
2098 /* Don't allow more than one "real" duplicate
2099 of a forward parm decl. */
2100 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2106 /* If we are processing a typedef statement, generate a whole new
2107 ..._TYPE node (which will be just an variant of the existing
2108 ..._TYPE node with identical properties) and then install the
2109 TYPE_DECL node generated to represent the typedef name as the
2110 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2112 The whole point here is to end up with a situation where each
2113 and every ..._TYPE node the compiler creates will be uniquely
2114 associated with AT MOST one node representing a typedef name.
2115 This way, even though the compiler substitutes corresponding
2116 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2117 early on, later parts of the compiler can always do the reverse
2118 translation and get back the corresponding typedef name. For
2121 typedef struct S MY_TYPE;
2124 Later parts of the compiler might only know that `object' was of
2125 type `struct S' if if were not for code just below. With this
2126 code however, later parts of the compiler see something like:
2128 struct S' == struct S
2129 typedef struct S' MY_TYPE;
2132 And they can then deduce (from the node for type struct S') that
2133 the original object declaration was:
2137 Being able to do this is important for proper support of protoize,
2138 and also for generating precise symbolic debugging information
2139 which takes full account of the programmer's (typedef) vocabulary.
2141 Obviously, we don't want to generate a duplicate ..._TYPE node if
2142 the TYPE_DECL node that we are now processing really represents a
2143 standard built-in type.
2145 Since all standard types are effectively declared at line zero
2146 in the source file, we can easily check to see if we are working
2147 on a standard type by checking the current value of lineno. */
2149 if (TREE_CODE (x
) == TYPE_DECL
)
2151 if (DECL_SOURCE_LINE (x
) == 0)
2153 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2154 TYPE_NAME (TREE_TYPE (x
)) = x
;
2156 else if (TREE_TYPE (x
) != error_mark_node
2157 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2159 tree tt
= TREE_TYPE (x
);
2160 DECL_ORIGINAL_TYPE (x
) = tt
;
2161 tt
= build_type_copy (tt
);
2167 /* Multiple external decls of the same identifier ought to match.
2168 Check against both global declarations (when traditional) and out of
2169 scope (limbo) block level declarations.
2171 We get warnings about inline functions where they are defined.
2172 Avoid duplicate warnings where they are used. */
2173 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
))
2177 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2178 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2179 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2180 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2181 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2182 /* Decls in limbo are always extern, so no need to check that. */
2183 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2187 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2188 /* If old decl is built-in, we already warned if we should. */
2189 && !DECL_BUILT_IN (decl
))
2191 pedwarn_with_decl (x
,
2192 "type mismatch with previous external decl");
2193 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2197 /* If a function has had an implicit declaration, and then is defined,
2198 make sure they are compatible. */
2200 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2201 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2202 && TREE_CODE (x
) == FUNCTION_DECL
2203 && ! comptypes (TREE_TYPE (x
),
2204 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2206 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2207 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2208 "previous implicit declaration of `%s'");
2211 /* In PCC-compatibility mode, extern decls of vars with no current decl
2212 take effect at top level no matter where they are. */
2213 if (flag_traditional
&& DECL_EXTERNAL (x
)
2214 && lookup_name (name
) == 0)
2216 tree type
= TREE_TYPE (x
);
2218 /* But don't do this if the type contains temporary nodes. */
2221 if (type
== error_mark_node
)
2223 if (! TREE_PERMANENT (type
))
2225 warning_with_decl (x
, "type of external `%s' is not global");
2226 /* By exiting the loop early, we leave TYPE nonzero,
2227 and thus prevent globalization of the decl. */
2230 else if (TREE_CODE (type
) == FUNCTION_TYPE
2231 && TYPE_ARG_TYPES (type
) != 0)
2232 /* The types might not be truly local,
2233 but the list of arg types certainly is temporary.
2234 Since prototypes are nontraditional,
2235 ok not to do the traditional thing. */
2237 type
= TREE_TYPE (type
);
2241 b
= global_binding_level
;
2244 /* This name is new in its binding level.
2245 Install the new declaration and return it. */
2246 if (b
== global_binding_level
)
2248 /* Install a global value. */
2250 /* If the first global decl has external linkage,
2251 warn if we later see static one. */
2252 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2253 TREE_PUBLIC (name
) = 1;
2255 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2257 /* We no longer care about any previous block level declarations. */
2258 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2260 /* Don't forget if the function was used via an implicit decl. */
2261 if (IDENTIFIER_IMPLICIT_DECL (name
)
2262 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2263 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2265 /* Don't forget if its address was taken in that way. */
2266 if (IDENTIFIER_IMPLICIT_DECL (name
)
2267 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2268 TREE_ADDRESSABLE (x
) = 1;
2270 /* Warn about mismatches against previous implicit decl. */
2271 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2272 /* If this real decl matches the implicit, don't complain. */
2273 && ! (TREE_CODE (x
) == FUNCTION_DECL
2274 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2275 == integer_type_node
)))
2276 pedwarn ("`%s' was previously implicitly declared to return `int'",
2277 IDENTIFIER_POINTER (name
));
2279 /* If this decl is `static' and an `extern' was seen previously,
2280 that is erroneous. */
2281 if (TREE_PUBLIC (name
)
2282 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2284 /* Okay to redeclare an ANSI built-in as static. */
2285 if (t
!= 0 && DECL_BUILT_IN (t
))
2287 /* Okay to declare a non-ANSI built-in as anything. */
2288 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2290 /* Okay to have global type decl after an earlier extern
2291 declaration inside a lexical block. */
2292 else if (TREE_CODE (x
) == TYPE_DECL
)
2294 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2296 if (! TREE_THIS_VOLATILE (name
))
2297 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2298 IDENTIFIER_POINTER (name
));
2301 pedwarn ("`%s' was declared `extern' and later `static'",
2302 IDENTIFIER_POINTER (name
));
2307 /* Here to install a non-global value. */
2308 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2309 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2310 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2312 /* If this is an extern function declaration, see if we
2313 have a global definition or declaration for the function. */
2315 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2317 && TREE_CODE (x
) == FUNCTION_DECL
2318 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2320 /* We have one. Their types must agree. */
2321 if (! comptypes (TREE_TYPE (x
),
2322 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2323 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2326 /* Inner extern decl is inline if global one is.
2327 Copy enough to really inline it. */
2328 if (DECL_INLINE (oldglobal
))
2330 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2331 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2332 ? 0 : DECL_INITIAL (oldglobal
));
2333 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2334 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2335 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2336 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2337 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2338 DECL_ABSTRACT_ORIGIN (x
) = oldglobal
;
2340 /* Inner extern decl is built-in if global one is. */
2341 if (DECL_BUILT_IN (oldglobal
))
2343 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2344 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2346 /* Keep the arg types from a file-scope fcn defn. */
2347 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2348 && DECL_INITIAL (oldglobal
)
2349 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2350 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2354 #if 0 /* This case is probably sometimes the right thing to do. */
2355 /* If we have a local external declaration,
2356 then any file-scope declaration should not
2357 have been static. */
2358 if (oldlocal
== 0 && oldglobal
!= 0
2359 && !TREE_PUBLIC (oldglobal
)
2360 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2361 warning ("`%s' locally external but globally static",
2362 IDENTIFIER_POINTER (name
));
2365 /* If we have a local external declaration,
2366 and no file-scope declaration has yet been seen,
2367 then if we later have a file-scope decl it must not be static. */
2369 && DECL_EXTERNAL (x
)
2373 TREE_PUBLIC (name
) = 1;
2375 /* Save this decl, so that we can do type checking against
2376 other decls after it falls out of scope.
2378 Only save it once. This prevents temporary decls created in
2379 expand_inline_function from being used here, since this
2380 will have been set when the inline function was parsed.
2381 It also helps give slightly better warnings. */
2382 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2383 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2386 /* Warn if shadowing an argument at the top level of the body. */
2387 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2388 /* This warning doesn't apply to the parms of a nested fcn. */
2389 && ! current_binding_level
->parm_flag
2390 /* Check that this is one level down from the parms. */
2391 && current_binding_level
->level_chain
->parm_flag
2392 /* Check that the decl being shadowed
2393 comes from the parm level, one level up. */
2394 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2396 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2397 pedwarn ("declaration of `%s' shadows a parameter",
2398 IDENTIFIER_POINTER (name
));
2400 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2401 IDENTIFIER_POINTER (name
));
2404 /* Maybe warn if shadowing something else. */
2405 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2406 /* No shadow warnings for internally generated vars. */
2407 && DECL_SOURCE_LINE (x
) != 0
2408 /* No shadow warnings for vars made for inlining. */
2409 && ! DECL_FROM_INLINE (x
))
2411 char *warnstring
= 0;
2413 if (TREE_CODE (x
) == PARM_DECL
2414 && current_binding_level
->level_chain
->parm_flag
)
2415 /* Don't warn about the parm names in function declarator
2416 within a function declarator.
2417 It would be nice to avoid warning in any function
2418 declarator in a declaration, as opposed to a definition,
2419 but there is no way to tell it's not a definition. */
2421 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2422 warnstring
= "declaration of `%s' shadows a parameter";
2423 else if (oldlocal
!= 0)
2424 warnstring
= "declaration of `%s' shadows previous local";
2425 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2426 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2427 warnstring
= "declaration of `%s' shadows global declaration";
2430 warning (warnstring
, IDENTIFIER_POINTER (name
));
2433 /* If storing a local value, there may already be one (inherited).
2434 If so, record it for restoration when this binding level ends. */
2436 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2439 /* Keep count of variables in this level with incomplete type. */
2440 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2444 /* Put decls on list in reverse order.
2445 We will reverse them later if necessary. */
2446 TREE_CHAIN (x
) = b
->names
;
2452 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2455 pushdecl_top_level (x
)
2459 register struct binding_level
*b
= current_binding_level
;
2461 current_binding_level
= global_binding_level
;
2463 current_binding_level
= b
;
2467 /* Generate an implicit declaration for identifier FUNCTIONID
2468 as a function of type int (). Print a warning if appropriate. */
2471 implicitly_declare (functionid
)
2475 int traditional_warning
= 0;
2476 /* Only one "implicit declaration" warning per identifier. */
2477 int implicit_warning
;
2479 /* Save the decl permanently so we can warn if definition follows. */
2480 push_obstacks_nochange ();
2481 end_temporary_allocation ();
2483 /* We used to reuse an old implicit decl here,
2484 but this loses with inline functions because it can clobber
2485 the saved decl chains. */
2486 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2487 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2489 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2491 /* Warn of implicit decl following explicit local extern decl.
2492 This is probably a program designed for traditional C. */
2493 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2494 traditional_warning
= 1;
2496 /* Warn once of an implicit declaration. */
2497 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2499 DECL_EXTERNAL (decl
) = 1;
2500 TREE_PUBLIC (decl
) = 1;
2502 /* Record that we have an implicit decl and this is it. */
2503 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2505 /* ANSI standard says implicit declarations are in the innermost block.
2506 So we record the decl in the standard fashion.
2507 If flag_traditional is set, pushdecl does it top-level. */
2510 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2511 maybe_objc_check_decl (decl
);
2513 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2515 if (mesg_implicit_function_declaration
&& implicit_warning
)
2517 if (mesg_implicit_function_declaration
== 2)
2518 error ("implicit declaration of function `%s'",
2519 IDENTIFIER_POINTER (functionid
));
2521 warning ("implicit declaration of function `%s'",
2522 IDENTIFIER_POINTER (functionid
));
2524 else if (warn_traditional
&& traditional_warning
)
2525 warning ("function `%s' was previously declared within a block",
2526 IDENTIFIER_POINTER (functionid
));
2528 /* Write a record describing this implicit function declaration to the
2529 prototypes file (if requested). */
2531 gen_aux_info_record (decl
, 0, 1, 0);
2538 /* Return zero if the declaration NEWDECL is valid
2539 when the declaration OLDDECL (assumed to be for the same name)
2540 has already been seen.
2541 Otherwise return an error message format string with a %s
2542 where the identifier should go. */
2545 redeclaration_error_message (newdecl
, olddecl
)
2546 tree newdecl
, olddecl
;
2548 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2550 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2552 /* pushdecl creates distinct types for TYPE_DECLs by calling
2553 build_type_copy, so the above comparison generally fails. We do
2554 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2555 is equivalent to what this code used to do before the build_type_copy
2556 call. The variant type distinction should not matter for traditional
2557 code, because it doesn't have type qualifiers. */
2558 if (flag_traditional
2559 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2561 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2563 return "redefinition of `%s'";
2565 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2567 /* Declarations of functions can insist on internal linkage
2568 but they can't be inconsistent with internal linkage,
2569 so there can be no error on that account.
2570 However defining the same name twice is no good. */
2571 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2572 /* However, defining once as extern inline and a second
2573 time in another way is ok. */
2574 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2575 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2576 return "redefinition of `%s'";
2579 else if (current_binding_level
== global_binding_level
)
2581 /* Objects declared at top level: */
2582 /* If at least one is a reference, it's ok. */
2583 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2585 /* Reject two definitions. */
2586 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2587 return "redefinition of `%s'";
2588 /* Now we have two tentative defs, or one tentative and one real def. */
2589 /* Insist that the linkage match. */
2590 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2591 return "conflicting declarations of `%s'";
2594 else if (current_binding_level
->parm_flag
2595 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2599 /* Newdecl has block scope. If olddecl has block scope also, then
2600 reject two definitions, and reject a definition together with an
2601 external reference. Otherwise, it is OK, because newdecl must
2602 be an extern reference to olddecl. */
2603 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2604 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2605 return "redeclaration of `%s'";
2610 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2611 Create one if none exists so far for the current function.
2612 This function is called for both label definitions and label references. */
2618 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2620 if (current_function_decl
== 0)
2622 error ("label %s referenced outside of any function",
2623 IDENTIFIER_POINTER (id
));
2627 /* Use a label already defined or ref'd with this name. */
2630 /* But not if it is inherited and wasn't declared to be inheritable. */
2631 if (DECL_CONTEXT (decl
) != current_function_decl
2632 && ! C_DECLARED_LABEL_FLAG (decl
))
2633 return shadow_label (id
);
2637 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2639 /* Make sure every label has an rtx. */
2642 /* A label not explicitly declared must be local to where it's ref'd. */
2643 DECL_CONTEXT (decl
) = current_function_decl
;
2645 DECL_MODE (decl
) = VOIDmode
;
2647 /* Say where one reference is to the label,
2648 for the sake of the error if it is not defined. */
2649 DECL_SOURCE_LINE (decl
) = lineno
;
2650 DECL_SOURCE_FILE (decl
) = input_filename
;
2652 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2654 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2659 /* Make a label named NAME in the current function,
2660 shadowing silently any that may be inherited from containing functions
2661 or containing scopes.
2663 Note that valid use, if the label being shadowed
2664 comes from another scope in the same function,
2665 requires calling declare_nonlocal_label right away. */
2671 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2677 /* Check to make sure that the label hasn't already been declared
2678 at this label scope */
2679 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2680 if (TREE_VALUE (dup
) == decl
)
2682 error ("duplicate label declaration `%s'",
2683 IDENTIFIER_POINTER (name
));
2684 error_with_decl (TREE_VALUE (dup
),
2685 "this is a previous declaration");
2686 /* Just use the previous declaration. */
2687 return lookup_label (name
);
2690 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2691 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2694 return lookup_label (name
);
2697 /* Define a label, specifying the location in the source file.
2698 Return the LABEL_DECL node for the label, if the definition is valid.
2699 Otherwise return 0. */
2702 define_label (filename
, line
, name
)
2707 tree decl
= lookup_label (name
);
2709 /* If label with this name is known from an outer context, shadow it. */
2710 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2712 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2713 IDENTIFIER_LABEL_VALUE (name
) = 0;
2714 decl
= lookup_label (name
);
2717 if (DECL_INITIAL (decl
) != 0)
2719 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2724 /* Mark label as having been defined. */
2725 DECL_INITIAL (decl
) = error_mark_node
;
2726 /* Say where in the source. */
2727 DECL_SOURCE_FILE (decl
) = filename
;
2728 DECL_SOURCE_LINE (decl
) = line
;
2733 /* Return the list of declarations of the current level.
2734 Note that this list is in reverse order unless/until
2735 you nreverse it; and when you do nreverse it, you must
2736 store the result back using `storedecls' or you will lose. */
2741 return current_binding_level
->names
;
2744 /* Return the list of type-tags (for structs, etc) of the current level. */
2749 return current_binding_level
->tags
;
2752 /* Store the list of declarations of the current level.
2753 This is done for the parameter declarations of a function being defined,
2754 after they are modified in the light of any missing parameters. */
2760 current_binding_level
->names
= decls
;
2763 /* Similarly, store the list of tags of the current level. */
2769 current_binding_level
->tags
= tags
;
2772 /* Given NAME, an IDENTIFIER_NODE,
2773 return the structure (or union or enum) definition for that name.
2774 Searches binding levels from BINDING_LEVEL up to the global level.
2775 If THISLEVEL_ONLY is nonzero, searches only the specified context
2776 (but skips any tag-transparent contexts to find one that is
2777 meaningful for tags).
2778 CODE says which kind of type the caller wants;
2779 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2780 If the wrong kind of type is found, an error is reported. */
2783 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2784 enum tree_code code
;
2785 struct binding_level
*binding_level
;
2789 register struct binding_level
*level
;
2791 for (level
= binding_level
; level
; level
= level
->level_chain
)
2794 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2796 if (TREE_PURPOSE (tail
) == name
)
2798 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2800 /* Definition isn't the kind we were looking for. */
2801 pending_invalid_xref
= name
;
2802 pending_invalid_xref_file
= input_filename
;
2803 pending_invalid_xref_line
= lineno
;
2805 return TREE_VALUE (tail
);
2808 if (thislevel_only
&& ! level
->tag_transparent
)
2814 /* Print an error message now
2815 for a recent invalid struct, union or enum cross reference.
2816 We don't print them immediately because they are not invalid
2817 when used in the `struct foo;' construct for shadowing. */
2820 pending_xref_error ()
2822 if (pending_invalid_xref
!= 0)
2823 error_with_file_and_line (pending_invalid_xref_file
,
2824 pending_invalid_xref_line
,
2825 "`%s' defined as wrong kind of tag",
2826 IDENTIFIER_POINTER (pending_invalid_xref
));
2827 pending_invalid_xref
= 0;
2830 /* Given a type, find the tag that was defined for it and return the tag name.
2831 Otherwise return 0. */
2834 lookup_tag_reverse (type
)
2837 register struct binding_level
*level
;
2839 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2842 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2844 if (TREE_VALUE (tail
) == type
)
2845 return TREE_PURPOSE (tail
);
2851 /* Look up NAME in the current binding level and its superiors
2852 in the namespace of variables, functions and typedefs.
2853 Return a ..._DECL node of some kind representing its definition,
2854 or return 0 if it is undefined. */
2861 if (current_binding_level
!= global_binding_level
2862 && IDENTIFIER_LOCAL_VALUE (name
))
2863 val
= IDENTIFIER_LOCAL_VALUE (name
);
2865 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2869 /* Similar to `lookup_name' but look only at current binding level. */
2872 lookup_name_current_level (name
)
2877 if (current_binding_level
== global_binding_level
)
2878 return IDENTIFIER_GLOBAL_VALUE (name
);
2880 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2883 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2884 if (DECL_NAME (t
) == name
)
2890 /* Create the predefined scalar types of C,
2891 and some nodes representing standard constants (0, 1, (void *) 0).
2892 Initialize the global binding level.
2893 Make definitions for built-in primitive functions. */
2896 init_decl_processing ()
2898 register tree endlink
;
2899 /* Either char* or void*. */
2900 tree traditional_ptr_type_node
;
2901 /* Data types of memcpy and strlen. */
2902 tree memcpy_ftype
, memset_ftype
, strlen_ftype
;
2903 tree void_ftype_any
, ptr_ftype_void
, ptr_ftype_ptr
;
2904 int wchar_type_size
;
2906 tree array_domain_type
;
2908 current_function_decl
= NULL
;
2909 named_labels
= NULL
;
2910 current_binding_level
= NULL_BINDING_LEVEL
;
2911 free_binding_level
= NULL_BINDING_LEVEL
;
2912 pushlevel (0); /* make the binding_level structure for global names */
2913 global_binding_level
= current_binding_level
;
2915 /* Define `int' and `char' first so that dbx will output them first. */
2917 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2918 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2919 integer_type_node
));
2921 /* Define `char', which is like either `signed char' or `unsigned char'
2922 but not the same as either. */
2926 ? make_signed_type (CHAR_TYPE_SIZE
)
2927 : make_unsigned_type (CHAR_TYPE_SIZE
));
2928 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2931 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2932 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2933 long_integer_type_node
));
2935 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2936 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2937 unsigned_type_node
));
2939 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
2940 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2941 long_unsigned_type_node
));
2943 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
2944 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2945 long_long_integer_type_node
));
2947 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
2948 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2949 long_long_unsigned_type_node
));
2951 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
2952 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2953 short_integer_type_node
));
2955 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
2956 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2957 short_unsigned_type_node
));
2959 /* `unsigned long' is the standard type for sizeof.
2960 Traditionally, use a signed type.
2961 Note that stddef.h uses `unsigned long',
2962 and this must agree, even if long and int are the same size. */
2964 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
))));
2965 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
2966 set_sizetype (signed_type (sizetype
));
2969 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
2971 error_mark_node
= make_node (ERROR_MARK
);
2972 TREE_TYPE (error_mark_node
) = error_mark_node
;
2974 /* Define both `signed char' and `unsigned char'. */
2975 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
2976 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2977 signed_char_type_node
));
2979 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
2980 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2981 unsigned_char_type_node
));
2983 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
2984 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2986 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
2987 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2989 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
2990 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2992 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
2993 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2995 intTI_type_node
= make_signed_type (GET_MODE_BITSIZE (TImode
));
2996 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2998 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
2999 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
3001 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
3002 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
3004 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
3005 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
3007 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
3008 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
3010 unsigned_intTI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (TImode
));
3011 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intTI_type_node
));
3013 float_type_node
= make_node (REAL_TYPE
);
3014 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
3015 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
3017 layout_type (float_type_node
);
3019 double_type_node
= make_node (REAL_TYPE
);
3020 if (flag_short_double
)
3021 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
3023 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
3024 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
3026 layout_type (double_type_node
);
3028 long_double_type_node
= make_node (REAL_TYPE
);
3029 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
3030 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
3031 long_double_type_node
));
3032 layout_type (long_double_type_node
);
3034 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
3035 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
3036 complex_integer_type_node
));
3037 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
3038 layout_type (complex_integer_type_node
);
3040 complex_float_type_node
= make_node (COMPLEX_TYPE
);
3041 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
3042 complex_float_type_node
));
3043 TREE_TYPE (complex_float_type_node
) = float_type_node
;
3044 layout_type (complex_float_type_node
);
3046 complex_double_type_node
= make_node (COMPLEX_TYPE
);
3047 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
3048 complex_double_type_node
));
3049 TREE_TYPE (complex_double_type_node
) = double_type_node
;
3050 layout_type (complex_double_type_node
);
3052 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
3053 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
3054 complex_long_double_type_node
));
3055 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
3056 layout_type (complex_long_double_type_node
);
3059 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
3060 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3061 signed_wchar_type_node
= signed_type (wchar_type_node
);
3062 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
3064 integer_zero_node
= build_int_2 (0, 0);
3065 TREE_TYPE (integer_zero_node
) = integer_type_node
;
3066 integer_one_node
= build_int_2 (1, 0);
3067 TREE_TYPE (integer_one_node
) = integer_type_node
;
3069 boolean_type_node
= integer_type_node
;
3070 boolean_true_node
= integer_one_node
;
3071 boolean_false_node
= integer_zero_node
;
3073 size_zero_node
= build_int_2 (0, 0);
3074 TREE_TYPE (size_zero_node
) = sizetype
;
3075 size_one_node
= build_int_2 (1, 0);
3076 TREE_TYPE (size_one_node
) = sizetype
;
3078 void_type_node
= make_node (VOID_TYPE
);
3079 pushdecl (build_decl (TYPE_DECL
,
3080 ridpointers
[(int) RID_VOID
], void_type_node
));
3081 layout_type (void_type_node
); /* Uses integer_zero_node */
3082 /* We are not going to have real types in C with less than byte alignment,
3083 so we might as well not have any types that claim to have it. */
3084 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
3086 null_pointer_node
= build_int_2 (0, 0);
3087 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
3088 layout_type (TREE_TYPE (null_pointer_node
));
3090 string_type_node
= build_pointer_type (char_type_node
);
3091 const_string_type_node
3092 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3094 /* Make a type to be the domain of a few array types
3095 whose domains don't really matter.
3096 200 is small enough that it always fits in size_t
3097 and large enough that it can hold most function names for the
3098 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3099 array_domain_type
= build_index_type (build_int_2 (200, 0));
3101 /* make a type for arrays of characters.
3102 With luck nothing will ever really depend on the length of this
3104 char_array_type_node
3105 = build_array_type (char_type_node
, array_domain_type
);
3106 /* Likewise for arrays of ints. */
3108 = build_array_type (integer_type_node
, array_domain_type
);
3109 /* This is for wide string constants. */
3110 wchar_array_type_node
3111 = build_array_type (wchar_type_node
, array_domain_type
);
3113 default_function_type
3114 = build_function_type (integer_type_node
, NULL_TREE
);
3116 ptr_type_node
= build_pointer_type (void_type_node
);
3118 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
3120 endlink
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3123 = build_function_type (void_type_node
, NULL_TREE
);
3126 = build_function_type (float_type_node
,
3127 tree_cons (NULL_TREE
, float_type_node
, endlink
));
3130 = build_function_type (double_type_node
,
3131 tree_cons (NULL_TREE
, double_type_node
, endlink
));
3133 ldouble_ftype_ldouble
3134 = build_function_type (long_double_type_node
,
3135 tree_cons (NULL_TREE
, long_double_type_node
,
3138 double_ftype_double_double
3139 = build_function_type (double_type_node
,
3140 tree_cons (NULL_TREE
, double_type_node
,
3141 tree_cons (NULL_TREE
,
3142 double_type_node
, endlink
)));
3145 = build_function_type (integer_type_node
,
3146 tree_cons (NULL_TREE
, integer_type_node
, endlink
));
3149 = build_function_type (long_integer_type_node
,
3150 tree_cons (NULL_TREE
,
3151 long_integer_type_node
, endlink
));
3153 void_ftype_ptr_ptr_int
3154 = build_function_type (void_type_node
,
3155 tree_cons (NULL_TREE
, ptr_type_node
,
3156 tree_cons (NULL_TREE
, ptr_type_node
,
3157 tree_cons (NULL_TREE
,
3161 int_ftype_cptr_cptr_sizet
3162 = build_function_type (integer_type_node
,
3163 tree_cons (NULL_TREE
, const_ptr_type_node
,
3164 tree_cons (NULL_TREE
, const_ptr_type_node
,
3165 tree_cons (NULL_TREE
,
3169 void_ftype_ptr_int_int
3170 = build_function_type (void_type_node
,
3171 tree_cons (NULL_TREE
, ptr_type_node
,
3172 tree_cons (NULL_TREE
, integer_type_node
,
3173 tree_cons (NULL_TREE
,
3177 string_ftype_ptr_ptr
/* strcpy prototype */
3178 = build_function_type (string_type_node
,
3179 tree_cons (NULL_TREE
, string_type_node
,
3180 tree_cons (NULL_TREE
,
3181 const_string_type_node
,
3184 int_ftype_string_string
/* strcmp prototype */
3185 = build_function_type (integer_type_node
,
3186 tree_cons (NULL_TREE
, const_string_type_node
,
3187 tree_cons (NULL_TREE
,
3188 const_string_type_node
,
3191 strlen_ftype
/* strlen prototype */
3192 = build_function_type (flag_traditional
? integer_type_node
: sizetype
,
3193 tree_cons (NULL_TREE
, const_string_type_node
,
3196 traditional_ptr_type_node
3197 = (flag_traditional
? string_type_node
: ptr_type_node
);
3199 memcpy_ftype
/* memcpy prototype */
3200 = build_function_type (traditional_ptr_type_node
,
3201 tree_cons (NULL_TREE
, ptr_type_node
,
3202 tree_cons (NULL_TREE
, const_ptr_type_node
,
3203 tree_cons (NULL_TREE
,
3207 memset_ftype
/* memset prototype */
3208 = build_function_type (traditional_ptr_type_node
,
3209 tree_cons (NULL_TREE
, ptr_type_node
,
3210 tree_cons (NULL_TREE
, integer_type_node
,
3211 tree_cons (NULL_TREE
,
3215 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3217 = build_function_type (ptr_type_node
,
3218 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3220 builtin_function ("__builtin_constant_p", default_function_type
,
3221 BUILT_IN_CONSTANT_P
, NULL_PTR
);
3223 builtin_function ("__builtin_return_address",
3224 build_function_type (ptr_type_node
,
3225 tree_cons (NULL_TREE
,
3228 BUILT_IN_RETURN_ADDRESS
, NULL_PTR
);
3230 builtin_function ("__builtin_frame_address",
3231 build_function_type (ptr_type_node
,
3232 tree_cons (NULL_TREE
,
3235 BUILT_IN_FRAME_ADDRESS
, NULL_PTR
);
3237 builtin_function ("__builtin_aggregate_incoming_address",
3238 build_function_type (ptr_type_node
, NULL_TREE
),
3239 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
, NULL_PTR
);
3241 /* Hooks for the DWARF 2 __throw routine. */
3242 builtin_function ("__builtin_unwind_init",
3243 build_function_type (void_type_node
, endlink
),
3244 BUILT_IN_UNWIND_INIT
, NULL_PTR
);
3245 builtin_function ("__builtin_fp", ptr_ftype_void
, BUILT_IN_FP
, NULL_PTR
);
3246 builtin_function ("__builtin_sp", ptr_ftype_void
, BUILT_IN_SP
, NULL_PTR
);
3247 builtin_function ("__builtin_dwarf_fp_regnum",
3248 build_function_type (unsigned_type_node
, endlink
),
3249 BUILT_IN_DWARF_FP_REGNUM
, NULL_PTR
);
3250 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int
,
3251 BUILT_IN_DWARF_REG_SIZE
, NULL_PTR
);
3252 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3253 BUILT_IN_FROB_RETURN_ADDR
, NULL_PTR
);
3254 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3255 BUILT_IN_EXTRACT_RETURN_ADDR
, NULL_PTR
);
3256 builtin_function ("__builtin_set_return_addr_reg",
3257 build_function_type (void_type_node
,
3258 tree_cons (NULL_TREE
,
3261 BUILT_IN_SET_RETURN_ADDR_REG
, NULL_PTR
);
3262 builtin_function ("__builtin_eh_stub", ptr_ftype_void
,
3263 BUILT_IN_EH_STUB
, NULL_PTR
);
3265 ("__builtin_set_eh_regs",
3266 build_function_type (void_type_node
,
3267 tree_cons (NULL_TREE
, ptr_type_node
,
3268 tree_cons (NULL_TREE
,
3269 type_for_mode (ptr_mode
, 0),
3271 BUILT_IN_SET_EH_REGS
, NULL_PTR
);
3273 builtin_function ("__builtin_alloca",
3274 build_function_type (ptr_type_node
,
3275 tree_cons (NULL_TREE
,
3278 BUILT_IN_ALLOCA
, "alloca");
3279 builtin_function ("__builtin_ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3280 /* Define alloca, ffs as builtins.
3281 Declare _exit just to mark it as volatile. */
3282 if (! flag_no_builtin
&& !flag_no_nonansi_builtin
)
3284 temp
= builtin_function ("alloca",
3285 build_function_type (ptr_type_node
,
3286 tree_cons (NULL_TREE
,
3289 BUILT_IN_ALLOCA
, NULL_PTR
);
3290 /* Suppress error if redefined as a non-function. */
3291 DECL_BUILT_IN_NONANSI (temp
) = 1;
3292 temp
= builtin_function ("ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3293 /* Suppress error if redefined as a non-function. */
3294 DECL_BUILT_IN_NONANSI (temp
) = 1;
3295 temp
= builtin_function ("_exit", void_ftype_any
, NOT_BUILT_IN
,
3297 TREE_THIS_VOLATILE (temp
) = 1;
3298 TREE_SIDE_EFFECTS (temp
) = 1;
3299 /* Suppress error if redefined as a non-function. */
3300 DECL_BUILT_IN_NONANSI (temp
) = 1;
3303 builtin_function ("__builtin_abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3304 builtin_function ("__builtin_fabsf", float_ftype_float
, BUILT_IN_FABS
,
3306 builtin_function ("__builtin_fabs", double_ftype_double
, BUILT_IN_FABS
,
3308 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3310 builtin_function ("__builtin_labs", long_ftype_long
, BUILT_IN_LABS
,
3312 builtin_function ("__builtin_saveregs",
3313 build_function_type (ptr_type_node
, NULL_TREE
),
3314 BUILT_IN_SAVEREGS
, NULL_PTR
);
3315 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3317 builtin_function ("__builtin_varargs",
3318 build_function_type (ptr_type_node
,
3319 tree_cons (NULL_TREE
,
3322 BUILT_IN_VARARGS
, NULL_PTR
);
3324 builtin_function ("__builtin_classify_type", default_function_type
,
3325 BUILT_IN_CLASSIFY_TYPE
, NULL_PTR
);
3326 builtin_function ("__builtin_next_arg",
3327 build_function_type (ptr_type_node
, NULL_TREE
),
3328 BUILT_IN_NEXT_ARG
, NULL_PTR
);
3329 builtin_function ("__builtin_args_info",
3330 build_function_type (integer_type_node
,
3331 tree_cons (NULL_TREE
,
3334 BUILT_IN_ARGS_INFO
, NULL_PTR
);
3336 /* Untyped call and return. */
3337 builtin_function ("__builtin_apply_args",
3338 build_function_type (ptr_type_node
, NULL_TREE
),
3339 BUILT_IN_APPLY_ARGS
, NULL_PTR
);
3341 temp
= tree_cons (NULL_TREE
,
3342 build_pointer_type (build_function_type (void_type_node
,
3344 tree_cons (NULL_TREE
,
3346 tree_cons (NULL_TREE
,
3349 builtin_function ("__builtin_apply",
3350 build_function_type (ptr_type_node
, temp
),
3351 BUILT_IN_APPLY
, NULL_PTR
);
3352 builtin_function ("__builtin_return",
3353 build_function_type (void_type_node
,
3354 tree_cons (NULL_TREE
,
3357 BUILT_IN_RETURN
, NULL_PTR
);
3359 /* Currently under experimentation. */
3360 builtin_function ("__builtin_memcpy", memcpy_ftype
,
3361 BUILT_IN_MEMCPY
, "memcpy");
3362 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet
,
3363 BUILT_IN_MEMCMP
, "memcmp");
3364 builtin_function ("__builtin_memset", memset_ftype
,
3365 BUILT_IN_MEMSET
, "memset");
3366 builtin_function ("__builtin_strcmp", int_ftype_string_string
,
3367 BUILT_IN_STRCMP
, "strcmp");
3368 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr
,
3369 BUILT_IN_STRCPY
, "strcpy");
3370 builtin_function ("__builtin_strlen", strlen_ftype
,
3371 BUILT_IN_STRLEN
, "strlen");
3372 builtin_function ("__builtin_sqrtf", float_ftype_float
,
3373 BUILT_IN_FSQRT
, "sqrtf");
3374 builtin_function ("__builtin_fsqrt", double_ftype_double
,
3375 BUILT_IN_FSQRT
, "sqrt");
3376 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble
,
3377 BUILT_IN_FSQRT
, "sqrtl");
3378 builtin_function ("__builtin_sinf", float_ftype_float
,
3379 BUILT_IN_SIN
, "sinf");
3380 builtin_function ("__builtin_sin", double_ftype_double
,
3381 BUILT_IN_SIN
, "sin");
3382 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble
,
3383 BUILT_IN_SIN
, "sinl");
3384 builtin_function ("__builtin_cosf", float_ftype_float
,
3385 BUILT_IN_COS
, "cosf");
3386 builtin_function ("__builtin_cos", double_ftype_double
,
3387 BUILT_IN_COS
, "cos");
3388 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble
,
3389 BUILT_IN_COS
, "cosl");
3390 builtin_function ("__builtin_setjmp",
3391 build_function_type (integer_type_node
,
3392 tree_cons (NULL_TREE
,
3393 ptr_type_node
, endlink
)),
3394 BUILT_IN_SETJMP
, NULL_PTR
);
3395 builtin_function ("__builtin_longjmp",
3398 tree_cons (NULL
, ptr_type_node
,
3399 tree_cons (NULL_TREE
,
3402 BUILT_IN_LONGJMP
, NULL_PTR
);
3404 /* In an ANSI C program, it is okay to supply built-in meanings
3405 for these functions, since applications cannot validly use them
3406 with any other meaning.
3407 However, honor the -fno-builtin option. */
3408 if (!flag_no_builtin
)
3410 builtin_function ("abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3411 builtin_function ("fabsf", float_ftype_float
, BUILT_IN_FABS
, NULL_PTR
);
3412 builtin_function ("fabs", double_ftype_double
, BUILT_IN_FABS
, NULL_PTR
);
3413 builtin_function ("fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3415 builtin_function ("labs", long_ftype_long
, BUILT_IN_LABS
, NULL_PTR
);
3416 builtin_function ("memcpy", memcpy_ftype
, BUILT_IN_MEMCPY
, NULL_PTR
);
3417 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet
, BUILT_IN_MEMCMP
,
3419 builtin_function ("memset", memset_ftype
, BUILT_IN_MEMSET
, NULL_PTR
);
3420 builtin_function ("strcmp", int_ftype_string_string
, BUILT_IN_STRCMP
,
3422 builtin_function ("strcpy", string_ftype_ptr_ptr
, BUILT_IN_STRCPY
,
3424 builtin_function ("strlen", strlen_ftype
, BUILT_IN_STRLEN
, NULL_PTR
);
3425 builtin_function ("sqrtf", float_ftype_float
, BUILT_IN_FSQRT
, NULL_PTR
);
3426 builtin_function ("sqrt", double_ftype_double
, BUILT_IN_FSQRT
, NULL_PTR
);
3427 builtin_function ("sqrtl", ldouble_ftype_ldouble
, BUILT_IN_FSQRT
,
3429 builtin_function ("sinf", float_ftype_float
, BUILT_IN_SIN
, NULL_PTR
);
3430 builtin_function ("sin", double_ftype_double
, BUILT_IN_SIN
, NULL_PTR
);
3431 builtin_function ("sinl", ldouble_ftype_ldouble
, BUILT_IN_SIN
, NULL_PTR
);
3432 builtin_function ("cosf", float_ftype_float
, BUILT_IN_COS
, NULL_PTR
);
3433 builtin_function ("cos", double_ftype_double
, BUILT_IN_COS
, NULL_PTR
);
3434 builtin_function ("cosl", ldouble_ftype_ldouble
, BUILT_IN_COS
, NULL_PTR
);
3436 /* Declare these functions volatile
3437 to avoid spurious "control drops through" warnings. */
3438 /* Don't specify the argument types, to avoid errors
3439 from certain code which isn't valid in ANSI but which exists. */
3440 temp
= builtin_function ("abort", void_ftype_any
, NOT_BUILT_IN
,
3442 TREE_THIS_VOLATILE (temp
) = 1;
3443 TREE_SIDE_EFFECTS (temp
) = 1;
3444 temp
= builtin_function ("exit", void_ftype_any
, NOT_BUILT_IN
, NULL_PTR
);
3445 TREE_THIS_VOLATILE (temp
) = 1;
3446 TREE_SIDE_EFFECTS (temp
) = 1;
3450 /* Support for these has not been written in either expand_builtin
3451 or build_function_call. */
3452 builtin_function ("__builtin_div", default_ftype
, BUILT_IN_DIV
, NULL_PTR
);
3453 builtin_function ("__builtin_ldiv", default_ftype
, BUILT_IN_LDIV
, NULL_PTR
);
3454 builtin_function ("__builtin_ffloor", double_ftype_double
, BUILT_IN_FFLOOR
,
3456 builtin_function ("__builtin_fceil", double_ftype_double
, BUILT_IN_FCEIL
,
3458 builtin_function ("__builtin_fmod", double_ftype_double_double
,
3459 BUILT_IN_FMOD
, NULL_PTR
);
3460 builtin_function ("__builtin_frem", double_ftype_double_double
,
3461 BUILT_IN_FREM
, NULL_PTR
);
3462 builtin_function ("__builtin_getexp", double_ftype_double
, BUILT_IN_GETEXP
,
3464 builtin_function ("__builtin_getman", double_ftype_double
, BUILT_IN_GETMAN
,
3468 pedantic_lvalues
= pedantic
;
3470 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3471 declare_function_name ();
3473 start_identifier_warnings ();
3475 /* Prepare to check format strings against argument lists. */
3476 init_function_format_info ();
3480 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3483 /* Return a definition for a builtin function named NAME and whose data type
3484 is TYPE. TYPE should be a function type with argument types.
3485 FUNCTION_CODE tells later passes how to compile calls to this function.
3486 See tree.h for its possible values.
3488 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3489 the name to be called if we can't opencode the function. */
3492 builtin_function (name
, type
, function_code
, library_name
)
3495 enum built_in_function function_code
;
3498 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3499 DECL_EXTERNAL (decl
) = 1;
3500 TREE_PUBLIC (decl
) = 1;
3501 /* If -traditional, permit redefining a builtin function any way you like.
3502 (Though really, if the program redefines these functions,
3503 it probably won't work right unless compiled with -fno-builtin.) */
3504 if (flag_traditional
&& name
[0] != '_')
3505 DECL_BUILT_IN_NONANSI (decl
) = 1;
3507 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3508 make_decl_rtl (decl
, NULL_PTR
, 1);
3510 if (function_code
!= NOT_BUILT_IN
)
3512 DECL_BUILT_IN (decl
) = 1;
3513 DECL_FUNCTION_CODE (decl
) = function_code
;
3515 /* Warn if a function in the namespace for users
3516 is used without an occasion to consider it declared. */
3517 if (name
[0] != '_' || name
[1] != '_')
3518 C_DECL_ANTICIPATED (decl
) = 1;
3523 /* Called when a declaration is seen that contains no names to declare.
3524 If its type is a reference to a structure, union or enum inherited
3525 from a containing scope, shadow that tag name for the current scope
3526 with a forward reference.
3527 If its type defines a new named structure or union
3528 or defines an enum, it is valid but we need not do anything here.
3529 Otherwise, it is an error. */
3532 shadow_tag (declspecs
)
3535 shadow_tag_warned (declspecs
, 0);
3539 shadow_tag_warned (declspecs
, warned
)
3542 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3549 pending_invalid_xref
= 0;
3551 /* Remove the attributes from declspecs, since they will confuse the
3553 split_specs_attrs (declspecs
, &specs
, &attrs
);
3555 for (link
= declspecs
; link
; link
= TREE_CHAIN (link
))
3557 register tree value
= TREE_VALUE (link
);
3558 register enum tree_code code
= TREE_CODE (value
);
3560 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3561 /* Used to test also that TYPE_SIZE (value) != 0.
3562 That caused warning for `struct foo;' at top level in the file. */
3564 register tree name
= lookup_tag_reverse (value
);
3571 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3572 /* Empty unnamed enum OK */
3574 pedwarn ("unnamed struct/union that defines no instances");
3580 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3584 t
= make_node (code
);
3591 if (!warned
&& ! in_system_header
)
3593 warning ("useless keyword or type name in empty declaration");
3600 error ("two types specified in one empty declaration");
3605 pedwarn ("empty declaration");
3609 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3612 groktypename (typename
)
3615 if (TREE_CODE (typename
) != TREE_LIST
)
3617 return grokdeclarator (TREE_VALUE (typename
),
3618 TREE_PURPOSE (typename
),
3622 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3625 groktypename_in_parm_context (typename
)
3628 if (TREE_CODE (typename
) != TREE_LIST
)
3630 return grokdeclarator (TREE_VALUE (typename
),
3631 TREE_PURPOSE (typename
),
3635 /* Decode a declarator in an ordinary declaration or data definition.
3636 This is called as soon as the type information and variable name
3637 have been parsed, before parsing the initializer if any.
3638 Here we create the ..._DECL node, fill in its type,
3639 and put it on the list of decls for the current context.
3640 The ..._DECL node is returned as the value.
3642 Exception: for arrays where the length is not specified,
3643 the type is left null, to be filled in by `finish_decl'.
3645 Function definitions do not come here; they go to start_function
3646 instead. However, external and forward declarations of functions
3647 do go through here. Structure field declarations are done by
3648 grokfield and not through here. */
3650 /* Set this to zero to debug not using the temporary obstack
3651 to parse initializers. */
3652 int debug_temp_inits
= 1;
3655 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3656 tree declarator
, declspecs
;
3658 tree attributes
, prefix_attributes
;
3660 register tree decl
= grokdeclarator (declarator
, declspecs
,
3661 NORMAL
, initialized
);
3663 int init_written
= initialized
;
3665 /* The corresponding pop_obstacks is in finish_decl. */
3666 push_obstacks_nochange ();
3668 if (warn_main
&& !strcmp (IDENTIFIER_POINTER (declarator
), "main"))
3669 warning_with_decl (decl
, "`%s' is usually a function");
3672 /* Is it valid for this decl to have an initializer at all?
3673 If not, set INITIALIZED to zero, which will indirectly
3674 tell `finish_decl' to ignore the initializer once it is parsed. */
3675 switch (TREE_CODE (decl
))
3678 /* typedef foo = bar means give foo the same type as bar.
3679 We haven't parsed bar yet, so `finish_decl' will fix that up.
3680 Any other case of an initialization in a TYPE_DECL is an error. */
3681 if (pedantic
|| list_length (declspecs
) > 1)
3683 error ("typedef `%s' is initialized",
3684 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3690 error ("function `%s' is initialized like a variable",
3691 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3696 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3697 error ("parameter `%s' is initialized",
3698 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3703 /* Don't allow initializations for incomplete types
3704 except for arrays which might be completed by the initialization. */
3705 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3707 /* A complete type is ok if size is fixed. */
3709 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3710 || C_DECL_VARIABLE_SIZE (decl
))
3712 error ("variable-sized object may not be initialized");
3716 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3718 error ("variable `%s' has initializer but incomplete type",
3719 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3722 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3724 error ("elements of array `%s' have incomplete type",
3725 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3732 #if 0 /* Seems redundant with grokdeclarator. */
3733 if (current_binding_level
!= global_binding_level
3734 && DECL_EXTERNAL (decl
)
3735 && TREE_CODE (decl
) != FUNCTION_DECL
)
3736 warning ("declaration of `%s' has `extern' and is initialized",
3737 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3739 DECL_EXTERNAL (decl
) = 0;
3740 if (current_binding_level
== global_binding_level
)
3741 TREE_STATIC (decl
) = 1;
3743 /* Tell `pushdecl' this is an initialized decl
3744 even though we don't yet have the initializer expression.
3745 Also tell `finish_decl' it may store the real initializer. */
3746 DECL_INITIAL (decl
) = error_mark_node
;
3749 /* If this is a function declaration, write a record describing it to the
3750 prototypes file (if requested). */
3752 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3753 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3755 /* ANSI specifies that a tentative definition which is not merged with
3756 a non-tentative definition behaves exactly like a definition with an
3757 initializer equal to zero. (Section 3.7.2)
3758 -fno-common gives strict ANSI behavior. Usually you don't want it.
3759 This matters only for variables with external linkage. */
3760 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3761 DECL_COMMON (decl
) = 1;
3763 /* Set attributes here so if duplicate decl, will have proper attributes. */
3764 decl_attributes (decl
, attributes
, prefix_attributes
);
3766 /* Add this decl to the current binding level.
3767 TEM may equal DECL or it may be a previous decl of the same name. */
3768 tem
= pushdecl (decl
);
3770 /* For a local variable, define the RTL now. */
3771 if (current_binding_level
!= global_binding_level
3772 /* But not if this is a duplicate decl
3773 and we preserved the rtl from the previous one
3774 (which may or may not happen). */
3775 && DECL_RTL (tem
) == 0)
3777 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3779 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3780 && DECL_INITIAL (tem
) != 0)
3786 /* When parsing and digesting the initializer,
3787 use temporary storage. Do this even if we will ignore the value. */
3788 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3789 temporary_allocation ();
3795 /* Finish processing of a declaration;
3796 install its initial value.
3797 If the length of an array type is not known before,
3798 it must be determined now, from the initial value, or it is an error. */
3801 finish_decl (decl
, init
, asmspec_tree
)
3805 register tree type
= TREE_TYPE (decl
);
3806 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3807 int temporary
= allocation_temporary_p ();
3810 /* If a name was specified, get the string. */
3812 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3814 /* If `start_decl' didn't like having an initialization, ignore it now. */
3816 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3818 /* Don't crash if parm is initialized. */
3819 if (TREE_CODE (decl
) == PARM_DECL
)
3822 if (ITERATOR_P (decl
))
3825 error_with_decl (decl
, "iterator has no initial value");
3827 init
= save_expr (init
);
3832 if (TREE_CODE (decl
) != TYPE_DECL
)
3833 store_init_value (decl
, init
);
3836 /* typedef foo = bar; store the type of bar as the type of foo. */
3837 TREE_TYPE (decl
) = TREE_TYPE (init
);
3838 DECL_INITIAL (decl
) = init
= 0;
3842 /* Pop back to the obstack that is current for this binding level.
3843 This is because MAXINDEX, rtl, etc. to be made below
3844 must go in the permanent obstack. But don't discard the
3845 temporary data yet. */
3847 #if 0 /* pop_obstacks was near the end; this is what was here. */
3848 if (current_binding_level
== global_binding_level
&& temporary
)
3849 end_temporary_allocation ();
3852 /* Deduce size of array from initialization, if not already known */
3854 if (TREE_CODE (type
) == ARRAY_TYPE
3855 && TYPE_DOMAIN (type
) == 0
3856 && TREE_CODE (decl
) != TYPE_DECL
)
3859 = (TREE_STATIC (decl
)
3860 /* Even if pedantic, an external linkage array
3861 may have incomplete type at first. */
3862 ? pedantic
&& !TREE_PUBLIC (decl
)
3863 : !DECL_EXTERNAL (decl
));
3865 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3867 /* Get the completed type made by complete_array_type. */
3868 type
= TREE_TYPE (decl
);
3871 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3876 error_with_decl (decl
, "array size missing in `%s'");
3877 /* If a `static' var's size isn't known,
3878 make it extern as well as static, so it does not get
3880 If it is not `static', then do not mark extern;
3881 finish_incomplete_decl will give it a default size
3882 and it will get allocated. */
3883 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3884 DECL_EXTERNAL (decl
) = 1;
3887 /* TYPE_MAX_VALUE is always one less than the number of elements
3888 in the array, because we start counting at zero. Therefore,
3889 warn only if the value is less than zero. */
3890 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3891 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3892 error_with_decl (decl
, "zero or negative size array `%s'");
3894 layout_decl (decl
, 0);
3897 if (TREE_CODE (decl
) == VAR_DECL
)
3899 if (DECL_SIZE (decl
) == 0
3900 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3901 layout_decl (decl
, 0);
3903 if (DECL_SIZE (decl
) == 0
3904 && (TREE_STATIC (decl
)
3906 /* A static variable with an incomplete type
3907 is an error if it is initialized.
3908 Also if it is not file scope.
3909 Otherwise, let it through, but if it is not `extern'
3910 then it may cause an error message later. */
3911 /* A duplicate_decls call could have changed an extern
3912 declaration into a file scope one. This can be detected
3913 by TREE_ASM_WRITTEN being set. */
3914 (DECL_INITIAL (decl
) != 0
3915 || (DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
)))
3917 /* An automatic variable with an incomplete type
3919 !DECL_EXTERNAL (decl
)))
3921 error_with_decl (decl
, "storage size of `%s' isn't known");
3922 TREE_TYPE (decl
) = error_mark_node
;
3925 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3926 && DECL_SIZE (decl
) != 0)
3928 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3929 constant_expression_warning (DECL_SIZE (decl
));
3931 error_with_decl (decl
, "storage size of `%s' isn't constant");
3934 if (TREE_USED (type
))
3935 TREE_USED (decl
) = 1;
3938 /* If this is a function and an assembler name is specified, it isn't
3939 builtin any more. Also reset DECL_RTL so we can give it its new
3941 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3943 DECL_BUILT_IN (decl
) = 0;
3944 DECL_RTL (decl
) = 0;
3947 /* Output the assembler code and/or RTL code for variables and functions,
3948 unless the type is an undefined structure or union.
3949 If not, it will get done when the type is completed. */
3951 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3953 if ((flag_traditional
|| TREE_PERMANENT (decl
))
3954 && allocation_temporary_p ())
3956 push_obstacks_nochange ();
3957 end_temporary_allocation ();
3958 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3959 maybe_objc_check_decl (decl
);
3960 rest_of_decl_compilation (decl
, asmspec
,
3961 (DECL_CONTEXT (decl
) == 0
3962 || TREE_ASM_WRITTEN (decl
)),
3968 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3969 maybe_objc_check_decl (decl
);
3970 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3973 if (DECL_CONTEXT (decl
) != 0)
3975 /* Recompute the RTL of a local array now
3976 if it used to be an incomplete type. */
3978 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3980 /* If we used it already as memory, it must stay in memory. */
3981 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3982 /* If it's still incomplete now, no init will save it. */
3983 if (DECL_SIZE (decl
) == 0)
3984 DECL_INITIAL (decl
) = 0;
3987 /* Compute and store the initial value. */
3988 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3989 expand_decl_init (decl
);
3993 if (TREE_CODE (decl
) == TYPE_DECL
)
3995 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3996 maybe_objc_check_decl (decl
);
3997 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0,
4001 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4002 /* This test used to include TREE_PERMANENT, however, we have the same
4003 problem with initializers at the function level. Such initializers get
4004 saved until the end of the function on the momentary_obstack. */
4005 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
4007 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4008 space with DECL_ARG_TYPE. */
4009 && TREE_CODE (decl
) != PARM_DECL
)
4011 /* We need to remember that this array HAD an initialization,
4012 but discard the actual temporary nodes,
4013 since we can't have a permanent node keep pointing to them. */
4014 /* We make an exception for inline functions, since it's
4015 normal for a local extern redeclaration of an inline function
4016 to have a copy of the top-level decl's DECL_INLINE. */
4017 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
4019 /* If this is a const variable, then preserve the
4020 initializer instead of discarding it so that we can optimize
4021 references to it. */
4022 /* This test used to include TREE_STATIC, but this won't be set
4023 for function level initializers. */
4024 if (TREE_READONLY (decl
) || ITERATOR_P (decl
))
4026 preserve_initializer ();
4027 /* Hack? Set the permanent bit for something that is permanent,
4028 but not on the permanent obstack, so as to convince
4029 output_constant_def to make its rtl on the permanent
4031 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
4033 /* The initializer and DECL must have the same (or equivalent
4034 types), but if the initializer is a STRING_CST, its type
4035 might not be on the right obstack, so copy the type
4037 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4040 DECL_INITIAL (decl
) = error_mark_node
;
4044 /* If requested, warn about definitions of large data objects. */
4046 if (warn_larger_than
4047 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
4048 && !DECL_EXTERNAL (decl
))
4050 register tree decl_size
= DECL_SIZE (decl
);
4052 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
4054 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
4056 if (units
> larger_than_size
)
4057 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
4062 /* Resume permanent allocation, if not within a function. */
4063 /* The corresponding push_obstacks_nochange is in start_decl,
4064 and in push_parm_decl and in grokfield. */
4068 /* If we have gone back from temporary to permanent allocation,
4069 actually free the temporary space that we no longer need. */
4070 if (temporary
&& !allocation_temporary_p ())
4071 permanent_allocation (0);
4073 /* At the end of a declaration, throw away any variable type sizes
4074 of types defined inside that declaration. There is no use
4075 computing them in the following function definition. */
4076 if (current_binding_level
== global_binding_level
)
4077 get_pending_sizes ();
4080 /* If DECL has a cleanup, build and return that cleanup here.
4081 This is a callback called by expand_expr. */
4084 maybe_build_cleanup (decl
)
4087 /* There are no cleanups in C. */
4091 /* Given a parsed parameter declaration,
4092 decode it into a PARM_DECL and push that on the current binding level.
4093 Also, for the sake of forward parm decls,
4094 record the given order of parms in `parm_order'. */
4097 push_parm_decl (parm
)
4101 int old_immediate_size_expand
= immediate_size_expand
;
4102 /* Don't try computing parm sizes now -- wait till fn is called. */
4103 immediate_size_expand
= 0;
4105 /* The corresponding pop_obstacks is in finish_decl. */
4106 push_obstacks_nochange ();
4108 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
4109 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
4110 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
4111 TREE_PURPOSE (TREE_VALUE (parm
)));
4114 if (DECL_NAME (decl
))
4117 olddecl
= lookup_name (DECL_NAME (decl
));
4118 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
4119 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
4123 decl
= pushdecl (decl
);
4125 immediate_size_expand
= old_immediate_size_expand
;
4127 current_binding_level
->parm_order
4128 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
4130 /* Add this decl to the current binding level. */
4131 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
4134 /* Clear the given order of parms in `parm_order'.
4135 Used at start of parm list,
4136 and also at semicolon terminating forward decls. */
4141 current_binding_level
->parm_order
= NULL_TREE
;
4144 /* Make TYPE a complete type based on INITIAL_VALUE.
4145 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4146 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4149 complete_array_type (type
, initial_value
, do_default
)
4154 register tree maxindex
= NULL_TREE
;
4159 /* Note MAXINDEX is really the maximum index,
4160 one less than the size. */
4161 if (TREE_CODE (initial_value
) == STRING_CST
)
4164 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
4165 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
4168 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
4170 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
4171 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
4172 for (; elts
; elts
= TREE_CHAIN (elts
))
4174 if (TREE_PURPOSE (elts
))
4175 maxindex
= TREE_PURPOSE (elts
);
4177 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
4179 maxindex
= copy_node (maxindex
);
4183 /* Make an error message unless that happened already. */
4184 if (initial_value
!= error_mark_node
)
4187 /* Prevent further error messages. */
4188 maxindex
= build_int_2 (0, 0);
4195 maxindex
= build_int_2 (0, 0);
4201 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
4202 if (!TREE_TYPE (maxindex
))
4203 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
4206 /* Lay out the type now that we can get the real answer. */
4213 /* Given declspecs and a declarator,
4214 determine the name and type of the object declared
4215 and construct a ..._DECL node for it.
4216 (In one case we can return a ..._TYPE node instead.
4217 For invalid input we sometimes return 0.)
4219 DECLSPECS is a chain of tree_list nodes whose value fields
4220 are the storage classes and type specifiers.
4222 DECL_CONTEXT says which syntactic context this declaration is in:
4223 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4224 FUNCDEF for a function definition. Like NORMAL but a few different
4225 error messages in each case. Return value may be zero meaning
4226 this definition is too screwy to try to parse.
4227 PARM for a parameter declaration (either within a function prototype
4228 or before a function body). Make a PARM_DECL, or return void_type_node.
4229 TYPENAME if for a typename (in a cast or sizeof).
4230 Don't make a DECL node; just return the ..._TYPE node.
4231 FIELD for a struct or union field; make a FIELD_DECL.
4232 BITFIELD for a field with specified width.
4233 INITIALIZED is 1 if the decl has an initializer.
4235 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4236 It may also be so in the PARM case, for a prototype where the
4237 argument type is specified but not the name.
4239 This function is where the complicated C meanings of `static'
4240 and `extern' are interpreted. */
4243 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4246 enum decl_context decl_context
;
4251 tree type
= NULL_TREE
;
4256 int explicit_int
= 0;
4257 int explicit_char
= 0;
4258 int defaulted_int
= 0;
4259 tree typedef_decl
= 0;
4261 tree typedef_type
= 0;
4262 int funcdef_flag
= 0;
4263 enum tree_code innermost_code
= ERROR_MARK
;
4265 int size_varies
= 0;
4266 tree decl_machine_attr
= NULL_TREE
;
4268 if (decl_context
== BITFIELD
)
4269 bitfield
= 1, decl_context
= FIELD
;
4271 if (decl_context
== FUNCDEF
)
4272 funcdef_flag
= 1, decl_context
= NORMAL
;
4274 push_obstacks_nochange ();
4276 if (flag_traditional
&& allocation_temporary_p ())
4277 end_temporary_allocation ();
4279 /* Look inside a declarator for the name being declared
4280 and get it as a string, for an error message. */
4282 register tree decl
= declarator
;
4286 switch (TREE_CODE (decl
))
4291 innermost_code
= TREE_CODE (decl
);
4292 decl
= TREE_OPERAND (decl
, 0);
4295 case IDENTIFIER_NODE
:
4296 name
= IDENTIFIER_POINTER (decl
);
4307 /* A function definition's declarator must have the form of
4308 a function declarator. */
4310 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4313 /* Anything declared one level down from the top level
4314 must be one of the parameters of a function
4315 (because the body is at least two levels down). */
4317 /* If this looks like a function definition, make it one,
4318 even if it occurs where parms are expected.
4319 Then store_parm_decls will reject it and not use it as a parm. */
4320 if (decl_context
== NORMAL
&& !funcdef_flag
4321 && current_binding_level
->parm_flag
)
4322 decl_context
= PARM
;
4324 /* Look through the decl specs and record which ones appear.
4325 Some typespecs are defined as built-in typenames.
4326 Others, the ones that are modifiers of other types,
4327 are represented by bits in SPECBITS: set the bits for
4328 the modifiers that appear. Storage class keywords are also in SPECBITS.
4330 If there is a typedef name or a type, store the type in TYPE.
4331 This includes builtin typedefs such as `int'.
4333 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4334 and did not come from a user typedef.
4336 Set LONGLONG if `long' is mentioned twice. */
4338 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4341 register tree id
= TREE_VALUE (spec
);
4343 if (id
== ridpointers
[(int) RID_INT
])
4345 if (id
== ridpointers
[(int) RID_CHAR
])
4348 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4349 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
4351 if (ridpointers
[i
] == id
)
4353 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
4356 error ("`long long long' is too long for GCC");
4359 if (pedantic
&& ! in_system_header
)
4360 pedwarn ("ANSI C does not support `long long'");
4364 else if (specbits
& (1 << i
))
4365 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4371 error ("two or more data types in declaration of `%s'", name
);
4372 /* Actual typedefs come to us as TYPE_DECL nodes. */
4373 else if (TREE_CODE (id
) == TYPE_DECL
)
4375 type
= TREE_TYPE (id
);
4376 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4379 /* Built-in types come as identifiers. */
4380 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4382 register tree t
= lookup_name (id
);
4383 if (TREE_TYPE (t
) == error_mark_node
)
4385 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4386 error ("`%s' fails to be a typedef or built in type",
4387 IDENTIFIER_POINTER (id
));
4390 type
= TREE_TYPE (t
);
4394 else if (TREE_CODE (id
) != ERROR_MARK
)
4400 typedef_type
= type
;
4402 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4404 /* No type at all: default to `int', and set DEFAULTED_INT
4405 because it was not a user-defined typedef. */
4409 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4410 | (1 << (int) RID_SIGNED
)
4411 | (1 << (int) RID_UNSIGNED
))))
4412 && ! (in_system_header
&& ! allocation_temporary_p ()))
4414 /* C9x will probably require a diagnostic here.
4415 For now, issue a warning if -Wreturn-type and this is a function,
4416 or if -Wimplicit; prefer the former warning since it is more
4418 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4419 warn_about_return_type
= 1;
4420 else if (warn_implicit_int
)
4421 warning ("type defaults to `int' in declaration of `%s'", name
);
4425 type
= integer_type_node
;
4428 /* Now process the modifiers that were specified
4429 and check for invalid combinations. */
4431 /* Long double is a special combination. */
4433 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4434 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4436 specbits
&= ~ (1 << (int) RID_LONG
);
4437 type
= long_double_type_node
;
4440 /* Check all other uses of type modifiers. */
4442 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4443 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4447 if ((specbits
& 1 << (int) RID_LONG
)
4448 && (specbits
& 1 << (int) RID_SHORT
))
4449 error ("both long and short specified for `%s'", name
);
4450 else if (((specbits
& 1 << (int) RID_LONG
)
4451 || (specbits
& 1 << (int) RID_SHORT
))
4453 error ("long or short specified with char for `%s'", name
);
4454 else if (((specbits
& 1 << (int) RID_LONG
)
4455 || (specbits
& 1 << (int) RID_SHORT
))
4456 && TREE_CODE (type
) == REAL_TYPE
)
4458 static int already
= 0;
4460 error ("long or short specified with floating type for `%s'", name
);
4461 if (! already
&& ! pedantic
)
4463 error ("the only valid combination is `long double'");
4467 else if ((specbits
& 1 << (int) RID_SIGNED
)
4468 && (specbits
& 1 << (int) RID_UNSIGNED
))
4469 error ("both signed and unsigned specified for `%s'", name
);
4470 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4471 error ("long, short, signed or unsigned invalid for `%s'", name
);
4475 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4477 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4479 if (flag_pedantic_errors
)
4484 /* Discard the type modifiers if they are invalid. */
4487 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4488 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4493 if ((specbits
& (1 << (int) RID_COMPLEX
))
4494 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4496 error ("complex invalid for `%s'", name
);
4497 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4500 /* Decide whether an integer type is signed or not.
4501 Optionally treat bitfields as signed by default. */
4502 if (specbits
& 1 << (int) RID_UNSIGNED
4503 /* Traditionally, all bitfields are unsigned. */
4504 || (bitfield
&& flag_traditional
4505 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4506 || (bitfield
&& ! flag_signed_bitfields
4507 && (explicit_int
|| defaulted_int
|| explicit_char
4508 /* A typedef for plain `int' without `signed'
4509 can be controlled just like plain `int'. */
4510 || ! (typedef_decl
!= 0
4511 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4512 && TREE_CODE (type
) != ENUMERAL_TYPE
4513 && !(specbits
& 1 << (int) RID_SIGNED
)))
4516 type
= long_long_unsigned_type_node
;
4517 else if (specbits
& 1 << (int) RID_LONG
)
4518 type
= long_unsigned_type_node
;
4519 else if (specbits
& 1 << (int) RID_SHORT
)
4520 type
= short_unsigned_type_node
;
4521 else if (type
== char_type_node
)
4522 type
= unsigned_char_type_node
;
4523 else if (typedef_decl
)
4524 type
= unsigned_type (type
);
4526 type
= unsigned_type_node
;
4528 else if ((specbits
& 1 << (int) RID_SIGNED
)
4529 && type
== char_type_node
)
4530 type
= signed_char_type_node
;
4532 type
= long_long_integer_type_node
;
4533 else if (specbits
& 1 << (int) RID_LONG
)
4534 type
= long_integer_type_node
;
4535 else if (specbits
& 1 << (int) RID_SHORT
)
4536 type
= short_integer_type_node
;
4538 if (specbits
& 1 << (int) RID_COMPLEX
)
4540 /* If we just have "complex", it is equivalent to
4541 "complex double", but if any modifiers at all are specified it is
4542 the complex form of TYPE. E.g, "complex short" is
4543 "complex short int". */
4545 if (defaulted_int
&& ! longlong
4546 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4547 | (1 << (int) RID_SIGNED
)
4548 | (1 << (int) RID_UNSIGNED
))))
4549 type
= complex_double_type_node
;
4550 else if (type
== integer_type_node
)
4551 type
= complex_integer_type_node
;
4552 else if (type
== float_type_node
)
4553 type
= complex_float_type_node
;
4554 else if (type
== double_type_node
)
4555 type
= complex_double_type_node
;
4556 else if (type
== long_double_type_node
)
4557 type
= complex_long_double_type_node
;
4559 type
= build_complex_type (type
);
4562 /* Set CONSTP if this declaration is `const', whether by
4563 explicit specification or via a typedef.
4564 Likewise for VOLATILEP. */
4566 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4567 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4568 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4570 pedwarn ("duplicate `const'");
4572 pedwarn ("duplicate `volatile'");
4573 if (! flag_gen_aux_info
&& (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)))
4574 type
= TYPE_MAIN_VARIANT (type
);
4576 /* Warn if two storage classes are given. Default to `auto'. */
4581 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4582 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4583 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4584 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4585 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4586 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4588 /* Warn about storage classes that are invalid for certain
4589 kinds of declarations (parameters, typenames, etc.). */
4592 error ("multiple storage classes in declaration of `%s'", name
);
4593 else if (funcdef_flag
4595 & ((1 << (int) RID_REGISTER
)
4596 | (1 << (int) RID_AUTO
)
4597 | (1 << (int) RID_TYPEDEF
))))
4599 if (specbits
& 1 << (int) RID_AUTO
4600 && (pedantic
|| current_binding_level
== global_binding_level
))
4601 pedwarn ("function definition declared `auto'");
4602 if (specbits
& 1 << (int) RID_REGISTER
)
4603 error ("function definition declared `register'");
4604 if (specbits
& 1 << (int) RID_TYPEDEF
)
4605 error ("function definition declared `typedef'");
4606 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4607 | (1 << (int) RID_AUTO
));
4609 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4611 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4615 error ((decl_context
== FIELD
4616 ? "storage class specified for structure field `%s'"
4617 : (decl_context
== PARM
4618 ? "storage class specified for parameter `%s'"
4619 : "storage class specified for typename")),
4621 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4622 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4623 | (1 << (int) RID_EXTERN
));
4626 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4628 /* `extern' with initialization is invalid if not at top level. */
4629 if (current_binding_level
== global_binding_level
)
4630 warning ("`%s' initialized and declared `extern'", name
);
4632 error ("`%s' has both `extern' and initializer", name
);
4634 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4635 && current_binding_level
!= global_binding_level
)
4636 error ("nested function `%s' declared `extern'", name
);
4637 else if (current_binding_level
== global_binding_level
4638 && specbits
& (1 << (int) RID_AUTO
))
4639 error ("top-level declaration of `%s' specifies `auto'", name
);
4640 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4641 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4643 error ("iterator `%s' has derived type", name
);
4644 type
= error_mark_node
;
4646 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4647 && TREE_CODE (type
) != INTEGER_TYPE
)
4649 error ("iterator `%s' has noninteger type", name
);
4650 type
= error_mark_node
;
4654 /* Now figure out the structure of the declarator proper.
4655 Descend through it, creating more complex types, until we reach
4656 the declared identifier (or NULL_TREE, in an absolute declarator). */
4658 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4660 if (type
== error_mark_node
)
4662 declarator
= TREE_OPERAND (declarator
, 0);
4666 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4667 an INDIRECT_REF (for *...),
4668 a CALL_EXPR (for ...(...)),
4669 an identifier (for the name being declared)
4670 or a null pointer (for the place in an absolute declarator
4671 where the name was omitted).
4672 For the last two cases, we have just exited the loop.
4674 At this point, TYPE is the type of elements of an array,
4675 or for a function to return, or for a pointer to point to.
4676 After this sequence of ifs, TYPE is the type of the
4677 array or function or pointer, and DECLARATOR has had its
4678 outermost layer removed. */
4680 if (TREE_CODE (declarator
) == ARRAY_REF
)
4682 register tree itype
= NULL_TREE
;
4683 register tree size
= TREE_OPERAND (declarator
, 1);
4684 /* An uninitialized decl with `extern' is a reference. */
4685 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4686 /* The index is a signed object `sizetype' bits wide. */
4687 tree index_type
= signed_type (sizetype
);
4689 declarator
= TREE_OPERAND (declarator
, 0);
4691 /* Check for some types that there cannot be arrays of. */
4693 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4695 error ("declaration of `%s' as array of voids", name
);
4696 type
= error_mark_node
;
4699 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4701 error ("declaration of `%s' as array of functions", name
);
4702 type
= error_mark_node
;
4705 if (size
== error_mark_node
)
4706 type
= error_mark_node
;
4708 if (type
== error_mark_node
)
4711 /* If this is a block level extern, it must live past the end
4712 of the function so that we can check it against other extern
4713 declarations (IDENTIFIER_LIMBO_VALUE). */
4714 if (extern_ref
&& allocation_temporary_p ())
4715 end_temporary_allocation ();
4717 /* If size was specified, set ITYPE to a range-type for that size.
4718 Otherwise, ITYPE remains null. finish_decl may figure it out
4719 from an initial value. */
4723 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4724 STRIP_TYPE_NOPS (size
);
4726 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4727 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4729 error ("size of array `%s' has non-integer type", name
);
4730 size
= integer_one_node
;
4733 if (pedantic
&& integer_zerop (size
))
4734 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4736 if (TREE_CODE (size
) == INTEGER_CST
)
4738 constant_expression_warning (size
);
4739 if (tree_int_cst_sgn (size
) < 0)
4741 error ("size of array `%s' is negative", name
);
4742 size
= integer_one_node
;
4747 /* Make sure the array size remains visibly nonconstant
4748 even if it is (eg) a const variable with known value. */
4753 if (TREE_CONSTANT (size
))
4754 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4756 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4760 /* Convert size to index_type, so that if it is a variable
4761 the computations will be done in the proper mode. */
4762 itype
= fold (build (MINUS_EXPR
, index_type
,
4763 convert (index_type
, size
),
4764 convert (index_type
, size_one_node
)));
4766 /* If that overflowed, the array is too big.
4767 ??? While a size of INT_MAX+1 technically shouldn't cause
4768 an overflow (because we subtract 1), the overflow is recorded
4769 during the conversion to index_type, before the subtraction.
4770 Handling this case seems like an unnecessary complication. */
4771 if (TREE_OVERFLOW (itype
))
4773 error ("size of array `%s' is too large", name
);
4774 type
= error_mark_node
;
4779 itype
= variable_size (itype
);
4780 itype
= build_index_type (itype
);
4783 #if 0 /* This had bad results for pointers to arrays, as in
4784 union incomplete (*foo)[4]; */
4785 /* Complain about arrays of incomplete types, except in typedefs. */
4787 if (TYPE_SIZE (type
) == 0
4788 /* Avoid multiple warnings for nested array types. */
4789 && TREE_CODE (type
) != ARRAY_TYPE
4790 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4791 && !C_TYPE_BEING_DEFINED (type
))
4792 warning ("array type has incomplete element type");
4795 #if 0 /* We shouldn't have a function type here at all!
4796 Functions aren't allowed as array elements. */
4797 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4798 && (constp
|| volatilep
))
4799 pedwarn ("ANSI C forbids const or volatile function types");
4802 /* Build the array type itself, then merge any constancy or
4803 volatility into the target type. We must do it in this order
4804 to ensure that the TYPE_MAIN_VARIANT field of the array type
4805 is set correctly. */
4807 type
= build_array_type (type
, itype
);
4808 if (constp
|| volatilep
)
4809 type
= c_build_type_variant (type
, constp
, volatilep
);
4811 #if 0 /* don't clear these; leave them set so that the array type
4812 or the variable is itself const or volatile. */
4818 C_TYPE_VARIABLE_SIZE (type
) = 1;
4820 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4822 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4823 || current_binding_level
== global_binding_level
);
4826 /* Declaring a function type.
4827 Make sure we have a valid type for the function to return. */
4828 if (type
== error_mark_node
)
4833 /* Warn about some types functions can't return. */
4835 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4837 error ("`%s' declared as function returning a function", name
);
4838 type
= integer_type_node
;
4840 if (TREE_CODE (type
) == ARRAY_TYPE
)
4842 error ("`%s' declared as function returning an array", name
);
4843 type
= integer_type_node
;
4846 #ifndef TRADITIONAL_RETURN_FLOAT
4847 /* Traditionally, declaring return type float means double. */
4849 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4850 type
= double_type_node
;
4851 #endif /* TRADITIONAL_RETURN_FLOAT */
4853 /* If this is a block level extern, it must live past the end
4854 of the function so that we can check it against other extern
4855 declarations (IDENTIFIER_LIMBO_VALUE). */
4856 if (extern_ref
&& allocation_temporary_p ())
4857 end_temporary_allocation ();
4859 /* Construct the function type and go to the next
4860 inner layer of declarator. */
4862 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4864 /* Say it's a definition
4865 only for the CALL_EXPR
4866 closest to the identifier. */
4867 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4868 #if 0 /* This seems to be false. We turn off temporary allocation
4869 above in this function if -traditional.
4870 And this code caused inconsistent results with prototypes:
4871 callers would ignore them, and pass arguments wrong. */
4873 /* Omit the arg types if -traditional, since the arg types
4874 and the list links might not be permanent. */
4875 type
= build_function_type (type
,
4877 ? NULL_TREE
: arg_types
);
4879 /* ANSI seems to say that `const int foo ();'
4880 does not make the function foo const. */
4881 if (constp
|| volatilep
)
4882 type
= c_build_type_variant (type
, constp
, volatilep
);
4886 type
= build_function_type (type
, arg_types
);
4887 declarator
= TREE_OPERAND (declarator
, 0);
4889 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4890 the formal parameter list of this FUNCTION_TYPE to point to
4891 the FUNCTION_TYPE node itself. */
4896 for (link
= last_function_parm_tags
;
4898 link
= TREE_CHAIN (link
))
4899 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4902 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4904 /* Merge any constancy or volatility into the target type
4907 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4908 && (constp
|| volatilep
))
4909 pedwarn ("ANSI C forbids const or volatile function types");
4910 if (constp
|| volatilep
)
4911 type
= c_build_type_variant (type
, constp
, volatilep
);
4916 type
= build_pointer_type (type
);
4918 /* Process a list of type modifier keywords
4919 (such as const or volatile) that were given inside the `*'. */
4921 if (TREE_TYPE (declarator
))
4923 register tree typemodlist
;
4925 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4926 typemodlist
= TREE_CHAIN (typemodlist
))
4928 if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_CONST
])
4930 else if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_VOLATILE
])
4935 error ("invalid type modifier within pointer declarator");
4939 pedwarn ("duplicate `const'");
4941 pedwarn ("duplicate `volatile'");
4944 declarator
= TREE_OPERAND (declarator
, 0);
4951 /* Now TYPE has the actual type. */
4953 /* Did array size calculations overflow? */
4955 if (TREE_CODE (type
) == ARRAY_TYPE
4957 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4958 error ("size of array `%s' is too large", name
);
4960 /* If this is declaring a typedef name, return a TYPE_DECL. */
4962 if (specbits
& (1 << (int) RID_TYPEDEF
))
4965 /* Note that the grammar rejects storage classes
4966 in typenames, fields or parameters */
4967 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4968 && (constp
|| volatilep
))
4969 pedwarn ("ANSI C forbids const or volatile function types");
4970 if (constp
|| volatilep
)
4971 type
= c_build_type_variant (type
, constp
, volatilep
);
4972 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4973 if ((specbits
& (1 << (int) RID_SIGNED
))
4974 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4975 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4980 /* Detect the case of an array type of unspecified size
4981 which came, as such, direct from a typedef name.
4982 We must copy the type, so that each identifier gets
4983 a distinct type, so that each identifier's size can be
4984 controlled separately by its own initializer. */
4986 if (type
!= 0 && typedef_type
!= 0
4987 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4988 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4990 type
= build_array_type (TREE_TYPE (type
), 0);
4992 C_TYPE_VARIABLE_SIZE (type
) = 1;
4995 /* If this is a type name (such as, in a cast or sizeof),
4996 compute the type and return it now. */
4998 if (decl_context
== TYPENAME
)
5000 /* Note that the grammar rejects storage classes
5001 in typenames, fields or parameters */
5002 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5003 && (constp
|| volatilep
))
5004 pedwarn ("ANSI C forbids const or volatile function types");
5005 if (constp
|| volatilep
)
5006 type
= c_build_type_variant (type
, constp
, volatilep
);
5011 /* Aside from typedefs and type names (handle above),
5012 `void' at top level (not within pointer)
5013 is allowed only in public variables.
5014 We don't complain about parms either, but that is because
5015 a better error message can be made later. */
5017 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
5018 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5019 && ((specbits
& (1 << (int) RID_EXTERN
))
5020 || (current_binding_level
== global_binding_level
5022 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
5024 error ("variable or field `%s' declared void", name
);
5025 type
= integer_type_node
;
5028 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5029 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5034 if (decl_context
== PARM
)
5036 tree type_as_written
= type
;
5039 /* A parameter declared as an array of T is really a pointer to T.
5040 One declared as a function is really a pointer to a function. */
5042 if (TREE_CODE (type
) == ARRAY_TYPE
)
5044 /* Transfer const-ness of array into that of type pointed to. */
5045 type
= TREE_TYPE (type
);
5046 if (constp
|| volatilep
)
5047 type
= c_build_type_variant (type
, constp
, volatilep
);
5048 type
= build_pointer_type (type
);
5049 volatilep
= constp
= 0;
5052 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5054 if (pedantic
&& (constp
|| volatilep
))
5055 pedwarn ("ANSI C forbids const or volatile function types");
5056 if (constp
|| volatilep
)
5057 type
= c_build_type_variant (type
, constp
, volatilep
);
5058 type
= build_pointer_type (type
);
5059 volatilep
= constp
= 0;
5062 decl
= build_decl (PARM_DECL
, declarator
, type
);
5064 C_DECL_VARIABLE_SIZE (decl
) = 1;
5066 /* Compute the type actually passed in the parmlist,
5067 for the case where there is no prototype.
5068 (For example, shorts and chars are passed as ints.)
5069 When there is a prototype, this is overridden later. */
5071 DECL_ARG_TYPE (decl
) = type
;
5072 main_type
= (type
== error_mark_node
5074 : TYPE_MAIN_VARIANT (type
));
5075 if (main_type
== float_type_node
)
5076 DECL_ARG_TYPE (decl
) = double_type_node
;
5077 /* Don't use TYPE_PRECISION to decide whether to promote,
5078 because we should convert short if it's the same size as int,
5079 but we should not convert long if it's the same size as int. */
5080 else if (TREE_CODE (main_type
) != ERROR_MARK
5081 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
5083 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
5084 && TREE_UNSIGNED (type
))
5085 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
5087 DECL_ARG_TYPE (decl
) = integer_type_node
;
5090 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
5092 else if (decl_context
== FIELD
)
5094 /* Structure field. It may not be a function. */
5096 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5098 error ("field `%s' declared as a function", name
);
5099 type
= build_pointer_type (type
);
5101 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
5103 error ("field `%s' has incomplete type", name
);
5104 type
= error_mark_node
;
5106 /* Move type qualifiers down to element of an array. */
5107 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
5109 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
5111 TYPE_DOMAIN (type
));
5112 #if 0 /* Leave the field const or volatile as well. */
5113 constp
= volatilep
= 0;
5116 decl
= build_decl (FIELD_DECL
, declarator
, type
);
5118 C_DECL_VARIABLE_SIZE (decl
) = 1;
5120 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5122 /* Every function declaration is "external"
5123 except for those which are inside a function body
5124 in which `auto' is used.
5125 That is a case not specified by ANSI C,
5126 and we use it for forward declarations for nested functions. */
5127 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
5128 || current_binding_level
== global_binding_level
);
5130 if (specbits
& (1 << (int) RID_AUTO
)
5131 && (pedantic
|| current_binding_level
== global_binding_level
))
5132 pedwarn ("invalid storage class for function `%s'", name
);
5133 if (specbits
& (1 << (int) RID_REGISTER
))
5134 error ("invalid storage class for function `%s'", name
);
5135 /* Function declaration not at top level.
5136 Storage classes other than `extern' are not allowed
5137 and `extern' makes no difference. */
5138 if (current_binding_level
!= global_binding_level
5139 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
5141 pedwarn ("invalid storage class for function `%s'", name
);
5143 /* If this is a block level extern, it must live past the end
5144 of the function so that we can check it against other
5145 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5146 if (extern_ref
&& allocation_temporary_p ())
5147 end_temporary_allocation ();
5149 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
5150 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
5152 if (pedantic
&& (constp
|| volatilep
)
5153 && ! DECL_IN_SYSTEM_HEADER (decl
))
5154 pedwarn ("ANSI C forbids const or volatile functions");
5157 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl
))) == void_type_node
5158 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl
)))
5159 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl
))))
5160 && ! DECL_IN_SYSTEM_HEADER (decl
))
5161 pedwarn ("ANSI C forbids const or volatile void function return type");
5164 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
5165 warning ("`noreturn' function returns non-void value");
5168 DECL_EXTERNAL (decl
) = 1;
5169 /* Record absence of global scope for `static' or `auto'. */
5171 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
5173 /* Record presence of `inline', if it is reasonable. */
5176 tree last
= tree_last (TYPE_ARG_TYPES (type
));
5178 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
5179 warning ("cannot inline function `main'");
5181 /* Assume that otherwise the function can be inlined. */
5182 DECL_INLINE (decl
) = 1;
5184 if (specbits
& (1 << (int) RID_EXTERN
))
5185 current_extern_inline
= 1;
5190 /* It's a variable. */
5191 /* An uninitialized decl with `extern' is a reference. */
5192 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
5194 /* Move type qualifiers down to element of an array. */
5195 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
5197 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
5199 TYPE_DOMAIN (type
));
5200 #if 0 /* Leave the variable const or volatile as well. */
5201 constp
= volatilep
= 0;
5205 /* If this is a block level extern, it must live past the end
5206 of the function so that we can check it against other
5207 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5208 if (extern_ref
&& allocation_temporary_p ())
5209 end_temporary_allocation ();
5211 decl
= build_decl (VAR_DECL
, declarator
, type
);
5213 C_DECL_VARIABLE_SIZE (decl
) = 1;
5216 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
5218 DECL_EXTERNAL (decl
) = extern_ref
;
5219 /* At top level, the presence of a `static' or `register' storage
5220 class specifier, or the absence of all storage class specifiers
5221 makes this declaration a definition (perhaps tentative). Also,
5222 the absence of both `static' and `register' makes it public. */
5223 if (current_binding_level
== global_binding_level
)
5227 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
5228 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
5230 /* Not at top level, only `static' makes a static definition. */
5233 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
5234 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
5237 if (specbits
& 1 << (int) RID_ITERATOR
)
5238 ITERATOR_P (decl
) = 1;
5241 /* Record `register' declaration for warnings on &
5242 and in case doing stupid register allocation. */
5244 if (specbits
& (1 << (int) RID_REGISTER
))
5245 DECL_REGISTER (decl
) = 1;
5247 /* Record constancy and volatility. */
5250 TREE_READONLY (decl
) = 1;
5253 TREE_SIDE_EFFECTS (decl
) = 1;
5254 TREE_THIS_VOLATILE (decl
) = 1;
5256 /* If a type has volatile components, it should be stored in memory.
5257 Otherwise, the fact that those components are volatile
5258 will be ignored, and would even crash the compiler. */
5259 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5260 mark_addressable (decl
);
5268 /* Decode the parameter-list info for a function type or function definition.
5269 The argument is the value returned by `get_parm_info' (or made in parse.y
5270 if there is an identifier list instead of a parameter decl list).
5271 These two functions are separate because when a function returns
5272 or receives functions then each is called multiple times but the order
5273 of calls is different. The last call to `grokparms' is always the one
5274 that contains the formal parameter names of a function definition.
5276 Store in `last_function_parms' a chain of the decls of parms.
5277 Also store in `last_function_parm_tags' a chain of the struct, union,
5278 and enum tags declared among the parms.
5280 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5282 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5283 a mere declaration. A nonempty identifier-list gets an error message
5284 when FUNCDEF_FLAG is zero. */
5287 grokparms (parms_info
, funcdef_flag
)
5291 tree first_parm
= TREE_CHAIN (parms_info
);
5293 last_function_parms
= TREE_PURPOSE (parms_info
);
5294 last_function_parm_tags
= TREE_VALUE (parms_info
);
5296 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5297 && !in_system_header
)
5298 warning ("function declaration isn't a prototype");
5301 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5304 pedwarn ("parameter names (without types) in function declaration");
5306 last_function_parms
= first_parm
;
5313 /* We no longer test FUNCDEF_FLAG.
5314 If the arg types are incomplete in a declaration,
5315 they must include undefined tags.
5316 These tags can never be defined in the scope of the declaration,
5317 so the types can never be completed,
5318 and no call can be compiled successfully. */
5320 /* In a fcn definition, arg types must be complete. */
5323 for (parm
= last_function_parms
, typelt
= first_parm
;
5325 parm
= TREE_CHAIN (parm
))
5326 /* Skip over any enumeration constants declared here. */
5327 if (TREE_CODE (parm
) == PARM_DECL
)
5329 /* Barf if the parameter itself has an incomplete type. */
5330 tree type
= TREE_VALUE (typelt
);
5331 if (TYPE_SIZE (type
) == 0)
5333 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5334 error ("parameter `%s' has incomplete type",
5335 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5337 warning ("parameter has incomplete type");
5340 TREE_VALUE (typelt
) = error_mark_node
;
5341 TREE_TYPE (parm
) = error_mark_node
;
5344 #if 0 /* This has been replaced by parm_tags_warning
5345 which uses a more accurate criterion for what to warn about. */
5348 /* Now warn if is a pointer to an incomplete type. */
5349 while (TREE_CODE (type
) == POINTER_TYPE
5350 || TREE_CODE (type
) == REFERENCE_TYPE
)
5351 type
= TREE_TYPE (type
);
5352 type
= TYPE_MAIN_VARIANT (type
);
5353 if (TYPE_SIZE (type
) == 0)
5355 if (DECL_NAME (parm
) != 0)
5356 warning ("parameter `%s' points to incomplete type",
5357 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5359 warning ("parameter points to incomplete type");
5363 typelt
= TREE_CHAIN (typelt
);
5366 /* Allocate the list of types the way we allocate a type. */
5367 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
5369 /* Construct a copy of the list of types
5370 on the saveable obstack. */
5372 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
5373 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
5375 return nreverse (result
);
5378 /* The list we have is permanent already. */
5384 /* Return a tree_list node with info on a parameter list just parsed.
5385 The TREE_PURPOSE is a chain of decls of those parms.
5386 The TREE_VALUE is a list of structure, union and enum tags defined.
5387 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5388 This tree_list node is later fed to `grokparms'.
5390 VOID_AT_END nonzero means append `void' to the end of the type-list.
5391 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5394 get_parm_info (void_at_end
)
5397 register tree decl
, t
;
5398 register tree types
= 0;
5400 tree tags
= gettags ();
5401 tree parms
= getdecls ();
5403 tree order
= current_binding_level
->parm_order
;
5405 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5406 if (void_at_end
&& parms
!= 0
5407 && TREE_CHAIN (parms
) == 0
5408 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
5409 && DECL_NAME (parms
) == 0)
5412 storedecls (NULL_TREE
);
5413 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
5414 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5417 /* Extract enumerator values and other non-parms declared with the parms.
5418 Likewise any forward parm decls that didn't have real parm decls. */
5419 for (decl
= parms
; decl
; )
5421 tree next
= TREE_CHAIN (decl
);
5423 if (TREE_CODE (decl
) != PARM_DECL
)
5425 TREE_CHAIN (decl
) = new_parms
;
5428 else if (TREE_ASM_WRITTEN (decl
))
5430 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
5431 TREE_CHAIN (decl
) = new_parms
;
5437 /* Put the parm decls back in the order they were in in the parm list. */
5438 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5441 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5443 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5446 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5449 /* Store the parmlist in the binding level since the old one
5450 is no longer a valid list. (We have changed the chain pointers.) */
5451 storedecls (new_parms
);
5453 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5454 /* There may also be declarations for enumerators if an enumeration
5455 type is declared among the parms. Ignore them here. */
5456 if (TREE_CODE (decl
) == PARM_DECL
)
5458 /* Since there is a prototype,
5459 args are passed in their declared types. */
5460 tree type
= TREE_TYPE (decl
);
5461 DECL_ARG_TYPE (decl
) = type
;
5462 #ifdef PROMOTE_PROTOTYPES
5463 if ((TREE_CODE (type
) == INTEGER_TYPE
5464 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5465 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5466 DECL_ARG_TYPE (decl
) = integer_type_node
;
5469 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5470 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5471 && DECL_NAME (decl
) == 0)
5473 error ("`void' in parameter list must be the entire list");
5479 return saveable_tree_cons (new_parms
, tags
,
5480 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5482 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5485 /* At end of parameter list, warn about any struct, union or enum tags
5486 defined within. Do so because these types cannot ever become complete. */
5489 parmlist_tags_warning ()
5494 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5496 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5497 /* An anonymous union parm type is meaningful as a GNU extension.
5498 So don't warn for that. */
5499 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5501 if (TREE_PURPOSE (elt
) != 0)
5502 warning ("`%s %s' declared inside parameter list",
5503 (code
== RECORD_TYPE
? "struct"
5504 : code
== UNION_TYPE
? "union"
5506 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5508 warning ("anonymous %s declared inside parameter list",
5509 (code
== RECORD_TYPE
? "struct"
5510 : code
== UNION_TYPE
? "union"
5515 warning ("its scope is only this definition or declaration,");
5516 warning ("which is probably not what you want.");
5522 /* Get the struct, enum or union (CODE says which) with tag NAME.
5523 Define the tag as a forward-reference if it is not defined. */
5526 xref_tag (code
, name
)
5527 enum tree_code code
;
5530 int temporary
= allocation_temporary_p ();
5532 /* If a cross reference is requested, look up the type
5533 already defined for this tag and return it. */
5535 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5536 /* Even if this is the wrong type of tag, return what we found.
5537 There will be an error message anyway, from pending_xref_error.
5538 If we create an empty xref just for an invalid use of the type,
5539 the main result is to create lots of superfluous error messages. */
5543 push_obstacks_nochange ();
5545 if (current_binding_level
== global_binding_level
&& temporary
)
5546 end_temporary_allocation ();
5548 /* If no such tag is yet defined, create a forward-reference node
5549 and record it as the "definition".
5550 When a real declaration of this type is found,
5551 the forward-reference will be altered into a real type. */
5553 ref
= make_node (code
);
5554 if (code
== ENUMERAL_TYPE
)
5556 /* (In ANSI, Enums can be referred to only if already defined.) */
5558 pedwarn ("ANSI C forbids forward references to `enum' types");
5559 /* Give the type a default layout like unsigned int
5560 to avoid crashing if it does not get defined. */
5561 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5562 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5563 TREE_UNSIGNED (ref
) = 1;
5564 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5565 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5566 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5569 pushtag (name
, ref
);
5576 /* Make sure that the tag NAME is defined *in the current binding level*
5577 at least as a forward reference.
5578 CODE says which kind of tag NAME ought to be.
5580 We also do a push_obstacks_nochange
5581 whose matching pop is in finish_struct. */
5584 start_struct (code
, name
)
5585 enum tree_code code
;
5588 /* If there is already a tag defined at this binding level
5589 (as a forward reference), just return it. */
5591 register tree ref
= 0;
5593 push_obstacks_nochange ();
5594 if (current_binding_level
== global_binding_level
)
5595 end_temporary_allocation ();
5598 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5599 if (ref
&& TREE_CODE (ref
) == code
)
5601 C_TYPE_BEING_DEFINED (ref
) = 1;
5602 TYPE_PACKED (ref
) = flag_pack_struct
;
5603 if (TYPE_FIELDS (ref
))
5604 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5605 : "redefinition of `struct %s'"),
5606 IDENTIFIER_POINTER (name
));
5611 /* Otherwise create a forward-reference just so the tag is in scope. */
5613 ref
= make_node (code
);
5614 pushtag (name
, ref
);
5615 C_TYPE_BEING_DEFINED (ref
) = 1;
5616 TYPE_PACKED (ref
) = flag_pack_struct
;
5620 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5621 of a structure component, returning a FIELD_DECL node.
5622 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5624 This is done during the parsing of the struct declaration.
5625 The FIELD_DECL nodes are chained together and the lot of them
5626 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5629 grokfield (filename
, line
, declarator
, declspecs
, width
)
5632 tree declarator
, declspecs
, width
;
5636 /* The corresponding pop_obstacks is in finish_decl. */
5637 push_obstacks_nochange ();
5639 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5641 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5642 DECL_INITIAL (value
) = width
;
5644 maybe_objc_check_decl (value
);
5648 /* Function to help qsort sort FIELD_DECLs by name order. */
5651 field_decl_cmp (xp
, yp
)
5652 const GENERIC_PTR xp
;
5653 const GENERIC_PTR yp
;
5655 tree
*x
= (tree
*)xp
, *y
= (tree
*)yp
;
5657 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5659 if (DECL_NAME (*x
) == NULL
)
5661 if (DECL_NAME (*y
) == NULL
)
5663 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5668 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5669 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5670 ATTRIBUTES are attributes to be applied to the structure.
5672 We also do a pop_obstacks to match the push in start_struct. */
5675 finish_struct (t
, fieldlist
, attributes
)
5682 int toplevel
= global_binding_level
== current_binding_level
;
5684 /* If this type was previously laid out as a forward reference,
5685 make sure we lay it out again. */
5689 decl_attributes (t
, attributes
, NULL_TREE
);
5691 /* Nameless union parm types are useful as GCC extension. */
5692 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5693 /* Otherwise, warn about any struct or union def. in parmlist. */
5694 if (in_parm_level_p ())
5697 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5698 : "structure defined inside parms"));
5699 else if (! flag_traditional
)
5700 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5701 : "structure defined inside parms"));
5704 old_momentary
= suspend_momentary ();
5708 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5709 if (DECL_NAME (x
) != 0)
5713 pedwarn ("%s has no %smembers",
5714 (TREE_CODE (t
) == UNION_TYPE
? "union" : "structure"),
5715 (fieldlist
? "named " : ""));
5718 /* Install struct as DECL_CONTEXT of each field decl.
5719 Also process specified field sizes.
5720 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5721 The specified size is found in the DECL_INITIAL.
5722 Store 0 there, except for ": 0" fields (so we can find them
5723 and delete them, below). */
5725 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5727 DECL_CONTEXT (x
) = t
;
5728 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5729 DECL_FIELD_SIZE (x
) = 0;
5731 /* If any field is const, the structure type is pseudo-const. */
5732 if (TREE_READONLY (x
))
5733 C_TYPE_FIELDS_READONLY (t
) = 1;
5736 /* A field that is pseudo-const makes the structure likewise. */
5737 tree t1
= TREE_TYPE (x
);
5738 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5739 t1
= TREE_TYPE (t1
);
5740 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5741 && C_TYPE_FIELDS_READONLY (t1
))
5742 C_TYPE_FIELDS_READONLY (t
) = 1;
5745 /* Any field that is volatile means variables of this type must be
5746 treated in some ways as volatile. */
5747 if (TREE_THIS_VOLATILE (x
))
5748 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5750 /* Any field of nominal variable size implies structure is too. */
5751 if (C_DECL_VARIABLE_SIZE (x
))
5752 C_TYPE_VARIABLE_SIZE (t
) = 1;
5754 /* Detect invalid nested redefinition. */
5755 if (TREE_TYPE (x
) == t
)
5756 error ("nested redefinition of `%s'",
5757 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5759 /* Detect invalid bit-field size. */
5760 if (DECL_INITIAL (x
))
5761 STRIP_NOPS (DECL_INITIAL (x
));
5762 if (DECL_INITIAL (x
))
5764 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5765 constant_expression_warning (DECL_INITIAL (x
));
5768 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5769 DECL_INITIAL (x
) = NULL
;
5773 /* Detect invalid bit-field type. */
5774 if (DECL_INITIAL (x
)
5775 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5776 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5778 error_with_decl (x
, "bit-field `%s' has invalid type");
5779 DECL_INITIAL (x
) = NULL
;
5781 if (DECL_INITIAL (x
) && pedantic
5782 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5783 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5784 /* Accept an enum that's equivalent to int or unsigned int. */
5785 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5786 && (TYPE_PRECISION (TREE_TYPE (x
))
5787 == TYPE_PRECISION (integer_type_node
))))
5788 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5790 /* Detect and ignore out of range field width. */
5791 if (DECL_INITIAL (x
))
5793 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5795 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5797 DECL_INITIAL (x
) = NULL
;
5798 error_with_decl (x
, "negative width in bit-field `%s'");
5800 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5801 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5803 DECL_INITIAL (x
) = NULL
;
5804 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5806 else if (width
== 0 && DECL_NAME (x
) != 0)
5808 error_with_decl (x
, "zero width for bit-field `%s'");
5809 DECL_INITIAL (x
) = NULL
;
5813 /* Process valid field width. */
5814 if (DECL_INITIAL (x
))
5816 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5818 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5819 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5820 TREE_UNSIGNED (TREE_TYPE (x
)))
5821 || width
< min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5822 TREE_UNSIGNED (TREE_TYPE (x
)))))
5823 warning_with_decl (x
, "`%s' is narrower than values of its type");
5825 DECL_FIELD_SIZE (x
) = width
;
5826 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5827 DECL_INITIAL (x
) = NULL
;
5831 /* field size 0 => force desired amount of alignment. */
5832 #ifdef EMPTY_FIELD_BOUNDARY
5833 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5835 #ifdef PCC_BITFIELD_TYPE_MATTERS
5836 if (PCC_BITFIELD_TYPE_MATTERS
)
5837 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5838 TYPE_ALIGN (TREE_TYPE (x
)));
5842 else if (TREE_TYPE (x
) != error_mark_node
)
5844 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5845 : TYPE_ALIGN (TREE_TYPE (x
)));
5846 /* Non-bit-fields are aligned for their type, except packed
5847 fields which require only BITS_PER_UNIT alignment. */
5848 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5852 /* Now DECL_INITIAL is null on all members. */
5854 /* Delete all duplicate fields from the fieldlist */
5855 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5856 /* Anonymous fields aren't duplicates. */
5857 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5861 register tree y
= fieldlist
;
5865 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5871 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5873 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5874 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5876 else x
= TREE_CHAIN (x
);
5879 /* Now we have the nearly final fieldlist. Record it,
5880 then lay out the structure or union (including the fields). */
5882 TYPE_FIELDS (t
) = fieldlist
;
5886 /* Delete all zero-width bit-fields from the front of the fieldlist */
5888 && DECL_INITIAL (fieldlist
))
5889 fieldlist
= TREE_CHAIN (fieldlist
);
5890 /* Delete all such members from the rest of the fieldlist */
5891 for (x
= fieldlist
; x
;)
5893 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5894 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5895 else x
= TREE_CHAIN (x
);
5898 /* Now we have the truly final field list.
5899 Store it in this type and in the variants. */
5901 TYPE_FIELDS (t
) = fieldlist
;
5903 /* If there are lots of fields, sort so we can look through them fast.
5904 We arbitrarily consider 16 or more elts to be "a lot". */
5908 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5919 len
+= list_length (x
);
5920 /* Use the same allocation policy here that make_node uses, to
5921 ensure that this lives as long as the rest of the struct decl.
5922 All decls in an inline function need to be saved. */
5923 if (allocation_temporary_p ())
5924 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5926 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5928 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5929 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5931 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5933 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5934 field_array
[len
++] = x
;
5936 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5940 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5942 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5943 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5944 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5947 /* If this was supposed to be a transparent union, but we can't
5948 make it one, warn and turn off the flag. */
5949 if (TREE_CODE (t
) == UNION_TYPE
5950 && TYPE_TRANSPARENT_UNION (t
)
5951 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5953 TYPE_TRANSPARENT_UNION (t
) = 0;
5954 warning ("union cannot be made transparent");
5957 /* If this structure or union completes the type of any previous
5958 variable declaration, lay it out and output its rtl. */
5960 if (current_binding_level
->n_incomplete
!= 0)
5963 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5965 if (TREE_TYPE (decl
) == t
5966 && TREE_CODE (decl
) != TYPE_DECL
)
5968 layout_decl (decl
, 0);
5969 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5970 maybe_objc_check_decl (decl
);
5971 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5974 --current_binding_level
->n_incomplete
;
5976 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5977 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5979 tree element
= TREE_TYPE (decl
);
5980 while (TREE_CODE (element
) == ARRAY_TYPE
)
5981 element
= TREE_TYPE (element
);
5983 layout_array_type (TREE_TYPE (decl
));
5988 resume_momentary (old_momentary
);
5990 /* Finish debugging output for this type. */
5991 rest_of_type_compilation (t
, toplevel
);
5993 /* The matching push is in start_struct. */
5999 /* Lay out the type T, and its element type, and so on. */
6002 layout_array_type (t
)
6005 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
6006 layout_array_type (TREE_TYPE (t
));
6010 /* Begin compiling the definition of an enumeration type.
6011 NAME is its name (or null if anonymous).
6012 Returns the type object, as yet incomplete.
6013 Also records info about it so that build_enumerator
6014 may be used to declare the individual values as they are read. */
6020 register tree enumtype
= 0;
6022 /* If this is the real definition for a previous forward reference,
6023 fill in the contents in the same object that used to be the
6024 forward reference. */
6027 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
6029 /* The corresponding pop_obstacks is in finish_enum. */
6030 push_obstacks_nochange ();
6031 /* If these symbols and types are global, make them permanent. */
6032 if (current_binding_level
== global_binding_level
)
6033 end_temporary_allocation ();
6035 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
6037 enumtype
= make_node (ENUMERAL_TYPE
);
6038 pushtag (name
, enumtype
);
6041 C_TYPE_BEING_DEFINED (enumtype
) = 1;
6043 if (TYPE_VALUES (enumtype
) != 0)
6045 /* This enum is a named one that has been declared already. */
6046 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
6048 /* Completely replace its old definition.
6049 The old enumerators remain defined, however. */
6050 TYPE_VALUES (enumtype
) = 0;
6053 enum_next_value
= integer_zero_node
;
6056 if (flag_short_enums
)
6057 TYPE_PACKED (enumtype
) = 1;
6062 /* After processing and defining all the values of an enumeration type,
6063 install their decls in the enumeration type and finish it off.
6064 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6065 and ATTRIBUTES are the specified attributes.
6066 Returns ENUMTYPE. */
6069 finish_enum (enumtype
, values
, attributes
)
6074 register tree pair
, tem
;
6075 tree minnode
= 0, maxnode
= 0;
6076 int lowprec
, highprec
, precision
;
6077 int toplevel
= global_binding_level
== current_binding_level
;
6079 if (in_parm_level_p ())
6080 warning ("enum defined inside parms");
6082 decl_attributes (enumtype
, attributes
, NULL_TREE
);
6084 /* Calculate the maximum value of any enumerator in this type. */
6086 if (values
== error_mark_node
)
6087 minnode
= maxnode
= integer_zero_node
;
6089 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6091 tree value
= TREE_VALUE (pair
);
6093 minnode
= maxnode
= TREE_VALUE (pair
);
6096 if (tree_int_cst_lt (maxnode
, value
))
6098 if (tree_int_cst_lt (value
, minnode
))
6103 TYPE_MIN_VALUE (enumtype
) = minnode
;
6104 TYPE_MAX_VALUE (enumtype
) = maxnode
;
6106 /* An enum can have some negative values; then it is signed. */
6107 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
6109 /* Determine the precision this type needs. */
6111 lowprec
= min_precision (minnode
, TREE_UNSIGNED (enumtype
));
6112 highprec
= min_precision (maxnode
, TREE_UNSIGNED (enumtype
));
6113 precision
= MAX (lowprec
, highprec
);
6115 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
6117 tree narrowest
= type_for_size (precision
, 1);
6120 warning ("enumeration values exceed range of largest integer");
6121 narrowest
= long_long_integer_type_node
;
6124 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (narrowest
);
6127 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
6129 TYPE_SIZE (enumtype
) = 0;
6130 layout_type (enumtype
);
6132 if (values
!= error_mark_node
)
6134 /* Change the type of the enumerators to be the enum type.
6135 Formerly this was done only for enums that fit in an int,
6136 but the comment said it was done only for enums wider than int.
6137 It seems necessary to do this for wide enums,
6138 and best not to change what's done for ordinary narrower ones. */
6139 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6141 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
6142 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
6143 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
6144 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
6147 /* Replace the decl nodes in VALUES with their names. */
6148 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
6149 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
6151 TYPE_VALUES (enumtype
) = values
;
6154 /* Fix up all variant types of this enum type. */
6155 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
6157 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
6158 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
6159 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
6160 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
6161 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
6162 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
6163 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
6164 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
6167 /* Finish debugging output for this type. */
6168 rest_of_type_compilation (enumtype
, toplevel
);
6170 /* This matches a push in start_enum. */
6176 /* Build and install a CONST_DECL for one value of the
6177 current enumeration type (one that was begun with start_enum).
6178 Return a tree-list containing the CONST_DECL and its value.
6179 Assignment of sequential values by default is handled here. */
6182 build_enumerator (name
, value
)
6185 register tree decl
, type
;
6187 /* Validate and default VALUE. */
6189 /* Remove no-op casts from the value. */
6191 STRIP_TYPE_NOPS (value
);
6195 if (TREE_CODE (value
) == INTEGER_CST
)
6197 value
= default_conversion (value
);
6198 constant_expression_warning (value
);
6202 error ("enumerator value for `%s' not integer constant",
6203 IDENTIFIER_POINTER (name
));
6208 /* Default based on previous value. */
6209 /* It should no longer be possible to have NON_LVALUE_EXPR
6213 value
= enum_next_value
;
6215 error ("overflow in enumeration values");
6218 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
6220 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6221 value
= integer_zero_node
;
6224 /* Set basis for default for next value. */
6225 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6226 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6228 /* Now create a declaration for the enum value name. */
6230 type
= TREE_TYPE (value
);
6231 type
= type_for_size (MAX (TYPE_PRECISION (type
),
6232 TYPE_PRECISION (integer_type_node
)),
6234 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
6235 && TREE_UNSIGNED (type
)));
6237 decl
= build_decl (CONST_DECL
, name
, type
);
6238 DECL_INITIAL (decl
) = value
;
6239 TREE_TYPE (value
) = type
;
6242 return saveable_tree_cons (decl
, value
, NULL_TREE
);
6245 /* Create the FUNCTION_DECL for a function definition.
6246 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6247 the declaration; they describe the function's name and the type it returns,
6248 but twisted together in a fashion that parallels the syntax of C.
6250 This function creates a binding context for the function body
6251 as well as setting up the FUNCTION_DECL in current_function_decl.
6253 Returns 1 on success. If the DECLARATOR is not suitable for a function
6254 (it defines a datum instead), we return 0, which tells
6255 yyparse to report a parse error.
6257 NESTED is nonzero for a function nested within another function. */
6260 start_function (declspecs
, declarator
, prefix_attributes
, attributes
, nested
)
6261 tree declarator
, declspecs
, prefix_attributes
, attributes
;
6264 tree decl1
, old_decl
;
6266 int old_immediate_size_expand
= immediate_size_expand
;
6268 current_function_returns_value
= 0; /* Assume, until we see it does. */
6269 current_function_returns_null
= 0;
6270 warn_about_return_type
= 0;
6271 current_extern_inline
= 0;
6272 c_function_varargs
= 0;
6274 shadowed_labels
= 0;
6276 /* Don't expand any sizes in the return type of the function. */
6277 immediate_size_expand
= 0;
6279 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
6281 /* If the declarator is not suitable for a function definition,
6282 cause a syntax error. */
6285 immediate_size_expand
= old_immediate_size_expand
;
6289 decl_attributes (decl1
, prefix_attributes
, attributes
);
6291 announce_function (decl1
);
6293 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
6295 error ("return-type is an incomplete type");
6296 /* Make it return void instead. */
6298 = build_function_type (void_type_node
,
6299 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6302 if (warn_about_return_type
)
6303 warning ("return-type defaults to `int'");
6305 /* Save the parm names or decls from this function's declarator
6306 where store_parm_decls will find them. */
6307 current_function_parms
= last_function_parms
;
6308 current_function_parm_tags
= last_function_parm_tags
;
6310 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6311 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6312 DECL_INITIAL (decl1
) = error_mark_node
;
6314 /* If this definition isn't a prototype and we had a prototype declaration
6315 before, copy the arg type info from that prototype.
6316 But not if what we had before was a builtin function. */
6317 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6318 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6319 && !DECL_BUILT_IN (old_decl
)
6320 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6321 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6322 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6324 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6325 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6326 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6329 /* If there is no explicit declaration, look for any out-of-scope implicit
6332 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6334 /* Optionally warn of old-fashioned def with no previous prototype. */
6335 if (warn_strict_prototypes
6336 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6337 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
6338 warning ("function declaration isn't a prototype");
6339 /* Optionally warn of any global def with no previous prototype. */
6340 else if (warn_missing_prototypes
6341 && TREE_PUBLIC (decl1
)
6342 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
6343 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6344 warning_with_decl (decl1
, "no previous prototype for `%s'");
6345 /* Optionally warn of any def with no previous prototype
6346 if the function has already been used. */
6347 else if (warn_missing_prototypes
6348 && old_decl
!= 0 && TREE_USED (old_decl
)
6349 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6350 warning_with_decl (decl1
,
6351 "`%s' was used with no prototype before its definition");
6352 /* Optionally warn of any global def with no previous declaration. */
6353 else if (warn_missing_declarations
6354 && TREE_PUBLIC (decl1
)
6356 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6357 warning_with_decl (decl1
, "no previous declaration for `%s'");
6358 /* Optionally warn of any def with no previous declaration
6359 if the function has already been used. */
6360 else if (warn_missing_declarations
6361 && old_decl
!= 0 && TREE_USED (old_decl
)
6362 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6363 warning_with_decl (decl1
,
6364 "`%s' was used with no declaration before its definition");
6366 /* This is a definition, not a reference.
6367 So normally clear DECL_EXTERNAL.
6368 However, `extern inline' acts like a declaration
6369 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6370 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6372 /* This function exists in static storage.
6373 (This does not mean `static' in the C sense!) */
6374 TREE_STATIC (decl1
) = 1;
6376 /* A nested function is not global. */
6377 if (current_function_decl
!= 0)
6378 TREE_PUBLIC (decl1
) = 0;
6380 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6382 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
6387 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6388 != integer_type_node
)
6389 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
6391 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6392 args
= TREE_CHAIN (args
))
6394 tree type
= args
? TREE_VALUE (args
) : 0;
6396 if (type
== void_type_node
)
6403 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6404 pedwarn_with_decl (decl1
,
6405 "first argument of `%s' should be `int'");
6409 if (TREE_CODE (type
) != POINTER_TYPE
6410 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6411 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6413 pedwarn_with_decl (decl1
,
6414 "second argument of `%s' should be `char **'");
6418 if (TREE_CODE (type
) != POINTER_TYPE
6419 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6420 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6422 pedwarn_with_decl (decl1
,
6423 "third argument of `%s' should probably be `char **'");
6428 /* It is intentional that this message does not mention the third
6429 argument, which is warned for only pedantically, because it's
6430 blessed by mention in an appendix of the standard. */
6431 if (argct
> 0 && (argct
< 2 || argct
> 3))
6432 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
6434 if (argct
== 3 && pedantic
)
6435 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
6437 if (! TREE_PUBLIC (decl1
))
6438 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
6441 /* Record the decl so that the function name is defined.
6442 If we already have a decl for this name, and it is a FUNCTION_DECL,
6443 use the old decl. */
6445 current_function_decl
= pushdecl (decl1
);
6448 declare_parm_level (1);
6449 current_binding_level
->subblocks_tag_transparent
= 1;
6451 make_function_rtl (current_function_decl
);
6453 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6454 /* Promote the value to int before returning it. */
6455 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6457 /* It retains unsignedness if traditional
6458 or if not really getting wider. */
6459 if (TREE_UNSIGNED (restype
)
6460 && (flag_traditional
6461 || (TYPE_PRECISION (restype
)
6462 == TYPE_PRECISION (integer_type_node
))))
6463 restype
= unsigned_type_node
;
6465 restype
= integer_type_node
;
6467 DECL_RESULT (current_function_decl
)
6468 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6471 /* Allocate further tree nodes temporarily during compilation
6472 of this function only. */
6473 temporary_allocation ();
6475 /* If this fcn was already referenced via a block-scope `extern' decl
6476 (or an implicit decl), propagate certain information about the usage. */
6477 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6478 TREE_ADDRESSABLE (current_function_decl
) = 1;
6480 immediate_size_expand
= old_immediate_size_expand
;
6485 /* Record that this function is going to be a varargs function.
6486 This is called before store_parm_decls, which is too early
6487 to call mark_varargs directly. */
6492 c_function_varargs
= 1;
6495 /* Store the parameter declarations into the current function declaration.
6496 This is called after parsing the parameter declarations, before
6497 digesting the body of the function.
6499 For an old-style definition, modify the function's type
6500 to specify at least the number of arguments. */
6505 register tree fndecl
= current_function_decl
;
6508 /* This is either a chain of PARM_DECLs (if a prototype was used)
6509 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6510 tree specparms
= current_function_parms
;
6512 /* This is a list of types declared among parms in a prototype. */
6513 tree parmtags
= current_function_parm_tags
;
6515 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6516 register tree parmdecls
= getdecls ();
6518 /* This is a chain of any other decls that came in among the parm
6519 declarations. If a parm is declared with enum {foo, bar} x;
6520 then CONST_DECLs for foo and bar are put here. */
6523 /* Nonzero if this definition is written with a prototype. */
6526 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6528 /* This case is when the function was defined with an ANSI prototype.
6529 The parms already have decls, so we need not do anything here
6530 except record them as in effect
6531 and complain if any redundant old-style parm decls were written. */
6542 error_with_decl (fndecl
,
6543 "parm types given both in parmlist and separately");
6544 /* Get rid of the erroneous decls; don't keep them on
6545 the list of parms, since they might not be PARM_DECLs. */
6546 for (decl
= current_binding_level
->names
;
6547 decl
; decl
= TREE_CHAIN (decl
))
6548 if (DECL_NAME (decl
))
6549 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6550 for (link
= current_binding_level
->shadowed
;
6551 link
; link
= TREE_CHAIN (link
))
6552 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6553 current_binding_level
->names
= 0;
6554 current_binding_level
->shadowed
= 0;
6557 specparms
= nreverse (specparms
);
6558 for (parm
= specparms
; parm
; parm
= next
)
6560 next
= TREE_CHAIN (parm
);
6561 if (TREE_CODE (parm
) == PARM_DECL
)
6563 if (DECL_NAME (parm
) == 0)
6564 error_with_decl (parm
, "parameter name omitted");
6565 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6567 error_with_decl (parm
, "parameter `%s' declared void");
6568 /* Change the type to error_mark_node so this parameter
6569 will be ignored by assign_parms. */
6570 TREE_TYPE (parm
) = error_mark_node
;
6576 /* If we find an enum constant or a type tag,
6577 put it aside for the moment. */
6578 TREE_CHAIN (parm
) = 0;
6579 others
= chainon (others
, parm
);
6583 /* Get the decls in their original chain order
6584 and record in the function. */
6585 DECL_ARGUMENTS (fndecl
) = getdecls ();
6588 /* If this function takes a variable number of arguments,
6589 add a phony parameter to the end of the parm list,
6590 to represent the position of the first unnamed argument. */
6591 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6594 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6595 /* Let's hope the address of the unnamed parm
6596 won't depend on its type. */
6597 TREE_TYPE (dummy
) = integer_type_node
;
6598 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6599 DECL_ARGUMENTS (fndecl
)
6600 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6604 /* Now pushdecl the enum constants. */
6605 for (parm
= others
; parm
; parm
= next
)
6607 next
= TREE_CHAIN (parm
);
6608 if (DECL_NAME (parm
) == 0)
6610 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6612 else if (TREE_CODE (parm
) != PARM_DECL
)
6616 storetags (chainon (parmtags
, gettags ()));
6620 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6621 each with a parm name as the TREE_VALUE.
6623 PARMDECLS is a chain of declarations for parameters.
6624 Warning! It can also contain CONST_DECLs which are not parameters
6625 but are names of enumerators of any enum types
6626 declared among the parameters.
6628 First match each formal parameter name with its declaration.
6629 Associate decls with the names and store the decls
6630 into the TREE_PURPOSE slots. */
6632 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6633 DECL_RESULT (parm
) = 0;
6635 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6637 register tree tail
, found
= NULL
;
6639 if (TREE_VALUE (parm
) == 0)
6641 error_with_decl (fndecl
, "parameter name missing from parameter list");
6642 TREE_PURPOSE (parm
) = 0;
6646 /* See if any of the parmdecls specifies this parm by name.
6647 Ignore any enumerator decls. */
6648 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6649 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6650 && TREE_CODE (tail
) == PARM_DECL
)
6656 /* If declaration already marked, we have a duplicate name.
6657 Complain, and don't use this decl twice. */
6658 if (found
&& DECL_RESULT (found
) != 0)
6660 error_with_decl (found
, "multiple parameters named `%s'");
6664 /* If the declaration says "void", complain and ignore it. */
6665 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6667 error_with_decl (found
, "parameter `%s' declared void");
6668 TREE_TYPE (found
) = integer_type_node
;
6669 DECL_ARG_TYPE (found
) = integer_type_node
;
6670 layout_decl (found
, 0);
6673 /* Traditionally, a parm declared float is actually a double. */
6674 if (found
&& flag_traditional
6675 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6677 TREE_TYPE (found
) = double_type_node
;
6678 DECL_ARG_TYPE (found
) = double_type_node
;
6679 layout_decl (found
, 0);
6682 /* If no declaration found, default to int. */
6685 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6687 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6688 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6689 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6691 warning_with_decl (found
, "type of `%s' defaults to `int'");
6695 TREE_PURPOSE (parm
) = found
;
6697 /* Mark this decl as "already found" -- see test, above.
6698 It is safe to use DECL_RESULT for this
6699 since it is not used in PARM_DECLs or CONST_DECLs. */
6700 DECL_RESULT (found
) = error_mark_node
;
6703 /* Put anything which is on the parmdecls chain and which is
6704 not a PARM_DECL onto the list NONPARMS. (The types of
6705 non-parm things which might appear on the list include
6706 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6707 any actual PARM_DECLs not matched with any names. */
6710 for (parm
= parmdecls
; parm
; )
6712 tree next
= TREE_CHAIN (parm
);
6713 TREE_CHAIN (parm
) = 0;
6715 if (TREE_CODE (parm
) != PARM_DECL
)
6716 nonparms
= chainon (nonparms
, parm
);
6719 /* Complain about args with incomplete types. */
6720 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6722 error_with_decl (parm
, "parameter `%s' has incomplete type");
6723 TREE_TYPE (parm
) = error_mark_node
;
6726 if (DECL_RESULT (parm
) == 0)
6728 error_with_decl (parm
,
6729 "declaration for parameter `%s' but no such parameter");
6730 /* Pretend the parameter was not missing.
6731 This gets us to a standard state and minimizes
6732 further error messages. */
6734 = chainon (specparms
,
6735 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6742 /* Chain the declarations together in the order of the list of names. */
6743 /* Store that chain in the function decl, replacing the list of names. */
6745 DECL_ARGUMENTS (fndecl
) = 0;
6748 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6749 if (TREE_PURPOSE (parm
))
6752 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6754 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6755 last
= TREE_PURPOSE (parm
);
6756 TREE_CHAIN (last
) = 0;
6760 /* If there was a previous prototype,
6761 set the DECL_ARG_TYPE of each argument according to
6762 the type previously specified, and report any mismatches. */
6764 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6767 for (parm
= DECL_ARGUMENTS (fndecl
),
6768 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6769 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6770 != void_type_node
));
6771 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6773 if (parm
== 0 || type
== 0
6774 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6776 error ("number of arguments doesn't match prototype");
6777 error_with_file_and_line (current_function_prototype_file
,
6778 current_function_prototype_line
,
6779 "prototype declaration");
6782 /* Type for passing arg must be consistent
6783 with that declared for the arg. */
6784 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6786 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6787 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6789 /* Adjust argument to match prototype. E.g. a previous
6790 `int foo(float);' prototype causes
6791 `int foo(x) float x; {...}' to be treated like
6792 `int foo(float x) {...}'. This is particularly
6793 useful for argument types like uid_t. */
6794 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6795 #ifdef PROMOTE_PROTOTYPES
6796 if ((TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6797 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6798 && TYPE_PRECISION (TREE_TYPE (parm
))
6799 < TYPE_PRECISION (integer_type_node
))
6800 DECL_ARG_TYPE (parm
) = integer_type_node
;
6804 pedwarn ("promoted argument `%s' doesn't match prototype",
6805 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6806 warning_with_file_and_line
6807 (current_function_prototype_file
,
6808 current_function_prototype_line
,
6809 "prototype declaration");
6812 /* If -traditional, allow `int' argument to match
6813 `unsigned' prototype. */
6814 else if (! (flag_traditional
6815 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6816 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6818 error ("argument `%s' doesn't match prototype",
6819 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6820 error_with_file_and_line (current_function_prototype_file
,
6821 current_function_prototype_line
,
6822 "prototype declaration");
6826 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6829 /* Otherwise, create a prototype that would match. */
6833 tree actual
= 0, last
= 0, type
;
6835 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6837 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6840 TREE_CHAIN (last
) = type
;
6845 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6847 TREE_CHAIN (last
) = type
;
6851 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6852 of the type of this function, but we need to avoid having this
6853 affect the types of other similarly-typed functions, so we must
6854 first force the generation of an identical (but separate) type
6855 node for the relevant function type. The new node we create
6856 will be a variant of the main variant of the original function
6859 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6861 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6864 /* Now store the final chain of decls for the arguments
6865 as the decl-chain of the current lexical scope.
6866 Put the enumerators in as well, at the front so that
6867 DECL_ARGUMENTS is not modified. */
6869 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6872 /* Make sure the binding level for the top of the function body
6873 gets a BLOCK if there are any in the function.
6874 Otherwise, the dbx output is wrong. */
6876 keep_next_if_subblocks
= 1;
6878 /* ??? This might be an improvement,
6879 but needs to be thought about some more. */
6881 keep_next_level_flag
= 1;
6884 /* Write a record describing this function definition to the prototypes
6885 file (if requested). */
6887 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6889 /* Initialize the RTL code for the function. */
6891 init_function_start (fndecl
, input_filename
, lineno
);
6893 /* If this is a varargs function, inform function.c. */
6895 if (c_function_varargs
)
6898 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6900 declare_function_name ();
6902 /* Set up parameters and prepare for return, for the function. */
6904 expand_function_start (fndecl
, 0);
6906 /* If this function is `main', emit a call to `__main'
6907 to run global initializers, etc. */
6908 if (DECL_NAME (fndecl
)
6909 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6910 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6911 expand_main_function ();
6914 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6915 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6916 stands for an ellipsis in the identifier list.
6918 PARMLIST is the data returned by get_parm_info for the
6919 parmlist that follows the semicolon.
6921 We return a value of the same sort that get_parm_info returns,
6922 except that it describes the combination of identifiers and parmlist. */
6925 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6926 tree specparms
, parmlist
;
6929 register tree fndecl
= current_function_decl
;
6932 tree parmdecls
= TREE_PURPOSE (parmlist
);
6934 /* This is a chain of any other decls that came in among the parm
6935 declarations. They were separated already by get_parm_info,
6936 so we just need to keep them separate. */
6937 tree nonparms
= TREE_VALUE (parmlist
);
6941 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6942 DECL_RESULT (parm
) = 0;
6944 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6946 register tree tail
, found
= NULL
;
6948 /* See if any of the parmdecls specifies this parm by name. */
6949 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6950 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6956 /* If declaration already marked, we have a duplicate name.
6957 Complain, and don't use this decl twice. */
6958 if (found
&& DECL_RESULT (found
) != 0)
6960 error_with_decl (found
, "multiple parameters named `%s'");
6964 /* If the declaration says "void", complain and ignore it. */
6965 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6967 error_with_decl (found
, "parameter `%s' declared void");
6968 TREE_TYPE (found
) = integer_type_node
;
6969 DECL_ARG_TYPE (found
) = integer_type_node
;
6970 layout_decl (found
, 0);
6973 /* Traditionally, a parm declared float is actually a double. */
6974 if (found
&& flag_traditional
6975 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6977 TREE_TYPE (found
) = double_type_node
;
6978 DECL_ARG_TYPE (found
) = double_type_node
;
6979 layout_decl (found
, 0);
6982 /* If no declaration found, default to int. */
6985 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6987 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6988 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6989 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6990 error_with_decl (found
, "type of parameter `%s' is not declared");
6994 TREE_PURPOSE (parm
) = found
;
6996 /* Mark this decl as "already found" -- see test, above.
6997 It is safe to use DECL_RESULT for this
6998 since it is not used in PARM_DECLs or CONST_DECLs. */
6999 DECL_RESULT (found
) = error_mark_node
;
7002 /* Complain about any actual PARM_DECLs not matched with any names. */
7004 for (parm
= parmdecls
; parm
; )
7006 tree next
= TREE_CHAIN (parm
);
7007 TREE_CHAIN (parm
) = 0;
7009 /* Complain about args with incomplete types. */
7010 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
7012 error_with_decl (parm
, "parameter `%s' has incomplete type");
7013 TREE_TYPE (parm
) = error_mark_node
;
7016 if (DECL_RESULT (parm
) == 0)
7018 error_with_decl (parm
,
7019 "declaration for parameter `%s' but no such parameter");
7020 /* Pretend the parameter was not missing.
7021 This gets us to a standard state and minimizes
7022 further error messages. */
7024 = chainon (specparms
,
7025 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
7031 /* Chain the declarations together in the order of the list of names.
7032 At the same time, build up a list of their types, in reverse order. */
7038 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
7039 if (TREE_PURPOSE (parm
))
7042 parmdecls
= TREE_PURPOSE (parm
);
7044 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
7045 last
= TREE_PURPOSE (parm
);
7046 TREE_CHAIN (last
) = 0;
7048 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
7053 return saveable_tree_cons (parmdecls
, nonparms
,
7054 nreverse (saveable_tree_cons (NULL_TREE
,
7058 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
7061 /* Finish up a function declaration and compile that function
7062 all the way to assembler language output. The free the storage
7063 for the function definition.
7065 This is called after parsing the body of the function definition.
7067 NESTED is nonzero if the function being finished is nested in another. */
7070 finish_function (nested
)
7073 register tree fndecl
= current_function_decl
;
7075 /* TREE_READONLY (fndecl) = 1;
7076 This caused &foo to be of type ptr-to-const-function
7077 which then got a warning when stored in a ptr-to-function variable. */
7080 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
7082 /* Must mark the RESULT_DECL as being in this function. */
7084 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
7086 /* Obey `register' declarations if `setjmp' is called in this fn. */
7087 if (flag_traditional
&& current_function_calls_setjmp
)
7089 setjmp_protect (DECL_INITIAL (fndecl
));
7090 setjmp_protect_args ();
7093 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
7095 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
7096 != integer_type_node
)
7098 /* You would expect the sense of this test to be the other way
7099 around, but if warn_main is set, we will already have warned,
7100 so this would be a duplicate. This is the warning you get
7101 in some environments even if you *don't* ask for it, because
7102 these are environments where it may be more of a problem than
7105 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
7109 #ifdef DEFAULT_MAIN_RETURN
7110 /* Make it so that `main' always returns success by default. */
7111 DEFAULT_MAIN_RETURN
;
7116 /* Generate rtl for function exit. */
7117 expand_function_end (input_filename
, lineno
, 0);
7119 /* So we can tell if jump_optimize sets it to 1. */
7122 /* Run the optimizers and output the assembler code for this function. */
7123 rest_of_compilation (fndecl
);
7125 current_function_returns_null
|= can_reach_end
;
7127 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
7128 warning ("`noreturn' function does return");
7129 else if (warn_return_type
&& can_reach_end
7130 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
7131 /* If this function returns non-void and control can drop through,
7133 warning ("control reaches end of non-void function");
7134 /* With just -W, complain only if function returns both with
7135 and without a value. */
7136 else if (extra_warnings
7137 && current_function_returns_value
&& current_function_returns_null
)
7138 warning ("this function may return with or without a value");
7140 /* If requested, warn about function definitions where the function will
7141 return a value (usually of some struct or union type) which itself will
7142 take up a lot of stack space. */
7144 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
7146 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
7150 register tree ret_type_size
= TYPE_SIZE (ret_type
);
7152 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
7155 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
7157 if (units
> larger_than_size
)
7158 warning_with_decl (fndecl
,
7159 "size of return value of `%s' is %u bytes",
7165 /* Free all the tree nodes making up this function. */
7166 /* Switch back to allocating nodes permanently
7167 until we start another function. */
7169 permanent_allocation (1);
7171 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
7173 /* Stop pointing to the local nodes about to be freed. */
7174 /* But DECL_INITIAL must remain nonzero so we know this
7175 was an actual function definition. */
7176 /* For a nested function, this is done in pop_c_function_context. */
7177 /* If rest_of_compilation set this to 0, leave it 0. */
7178 if (DECL_INITIAL (fndecl
) != 0)
7179 DECL_INITIAL (fndecl
) = error_mark_node
;
7180 DECL_ARGUMENTS (fndecl
) = 0;
7183 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
7185 #ifndef ASM_OUTPUT_CONSTRUCTOR
7186 if (! flag_gnu_linker
)
7187 static_ctors
= perm_tree_cons (NULL_TREE
, fndecl
, static_ctors
);
7190 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7192 if (DECL_STATIC_DESTRUCTOR (fndecl
))
7194 #ifndef ASM_OUTPUT_DESTRUCTOR
7195 if (! flag_gnu_linker
)
7196 static_dtors
= perm_tree_cons (NULL_TREE
, fndecl
, static_dtors
);
7199 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7204 /* Let the error reporting routines know that we're outside a
7205 function. For a nested function, this value is used in
7206 pop_c_function_context and then reset via pop_function_context. */
7207 current_function_decl
= NULL
;
7211 /* Save and restore the variables in this file and elsewhere
7212 that keep track of the progress of compilation of the current function.
7213 Used for nested functions. */
7217 struct c_function
*next
;
7219 tree shadowed_labels
;
7222 int warn_about_return_type
;
7224 struct binding_level
*binding_level
;
7227 struct c_function
*c_function_chain
;
7229 /* Save and reinitialize the variables
7230 used during compilation of a C function. */
7233 push_c_function_context ()
7235 struct c_function
*p
7236 = (struct c_function
*) xmalloc (sizeof (struct c_function
));
7239 pedwarn ("ANSI C forbids nested functions");
7241 push_function_context ();
7243 p
->next
= c_function_chain
;
7244 c_function_chain
= p
;
7246 p
->named_labels
= named_labels
;
7247 p
->shadowed_labels
= shadowed_labels
;
7248 p
->returns_value
= current_function_returns_value
;
7249 p
->returns_null
= current_function_returns_null
;
7250 p
->warn_about_return_type
= warn_about_return_type
;
7251 p
->extern_inline
= current_extern_inline
;
7252 p
->binding_level
= current_binding_level
;
7255 /* Restore the variables used during compilation of a C function. */
7258 pop_c_function_context ()
7260 struct c_function
*p
= c_function_chain
;
7263 /* Bring back all the labels that were shadowed. */
7264 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7265 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7266 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7267 = TREE_VALUE (link
);
7269 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
7271 /* Stop pointing to the local nodes about to be freed. */
7272 /* But DECL_INITIAL must remain nonzero so we know this
7273 was an actual function definition. */
7274 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7275 DECL_ARGUMENTS (current_function_decl
) = 0;
7278 pop_function_context ();
7280 c_function_chain
= p
->next
;
7282 named_labels
= p
->named_labels
;
7283 shadowed_labels
= p
->shadowed_labels
;
7284 current_function_returns_value
= p
->returns_value
;
7285 current_function_returns_null
= p
->returns_null
;
7286 warn_about_return_type
= p
->warn_about_return_type
;
7287 current_extern_inline
= p
->extern_inline
;
7288 current_binding_level
= p
->binding_level
;
7293 /* integrate_decl_tree calls this function, but since we don't use the
7294 DECL_LANG_SPECIFIC field, this is a no-op. */
7297 copy_lang_decl (node
)