1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL
, /* Ordinary declaration */
40 FUNCDEF
, /* Function definition */
41 PARM
, /* Declaration of parm before function body */
42 FIELD
, /* Declaration inside struct or union */
43 BITFIELD
, /* Likewise but with specified width */
44 TYPENAME
}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node
;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node
;
111 tree integer_type_node
;
112 tree long_integer_type_node
;
113 tree long_long_integer_type_node
;
115 tree short_unsigned_type_node
;
116 tree unsigned_type_node
;
117 tree long_unsigned_type_node
;
118 tree long_long_unsigned_type_node
;
120 tree boolean_type_node
;
121 tree boolean_false_node
;
122 tree boolean_true_node
;
124 tree ptrdiff_type_node
;
126 tree unsigned_char_type_node
;
127 tree signed_char_type_node
;
129 tree wchar_type_node
;
130 tree signed_wchar_type_node
;
131 tree unsigned_wchar_type_node
;
133 tree float_type_node
;
134 tree double_type_node
;
135 tree long_double_type_node
;
137 tree complex_integer_type_node
;
138 tree complex_float_type_node
;
139 tree complex_double_type_node
;
140 tree complex_long_double_type_node
;
142 tree intQI_type_node
;
143 tree intHI_type_node
;
144 tree intSI_type_node
;
145 tree intDI_type_node
;
147 tree unsigned_intQI_type_node
;
148 tree unsigned_intHI_type_node
;
149 tree unsigned_intSI_type_node
;
150 tree unsigned_intDI_type_node
;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node
, const_ptr_type_node
;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node
, const_string_type_node
;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node
;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node
;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node
;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type
;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double
, double_ftype_double_double
;
186 tree int_ftype_int
, long_ftype_long
;
187 tree float_ftype_float
;
188 tree ldouble_ftype_ldouble
;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int
, int_ftype_ptr_ptr_int
, void_ftype_ptr_int_int
;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr
, int_ftype_string_string
;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet
;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node
;
204 tree null_pointer_node
;
206 /* A node for the integer constant 1. */
208 tree integer_one_node
;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref
;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file
;
216 int pending_invalid_xref_line
;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value
;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow
;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms
;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags
;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms
;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags
;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file
;
252 static int current_function_prototype_line
;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels
;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels
;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs
;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl
;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value
;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null
;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type
;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline
;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level
*level_chain
;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent
;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent
;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks
;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level
*current_binding_level
;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level
*free_binding_level
;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level
*global_binding_level
;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag
;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks
;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level
*label_level_chain
;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors
, static_dtors
;
412 /* Forward declarations. */
414 static struct binding_level
* make_binding_level
PROTO((void));
415 static void clear_limbo_values
PROTO((tree
));
416 static int duplicate_decls
PROTO((tree
, tree
, int));
417 static char *redeclaration_error_message
PROTO((tree
, tree
));
418 static void storedecls
PROTO((tree
));
419 static void storetags
PROTO((tree
));
420 static tree lookup_tag
PROTO((enum tree_code
, tree
,
421 struct binding_level
*, int));
422 static tree lookup_tag_reverse
PROTO((tree
));
423 static tree grokdeclarator
PROTO((tree
, tree
, enum decl_context
,
425 static tree grokparms
PROTO((tree
, int));
426 static int field_decl_cmp
PROTO((tree
*, tree
*));
427 static void layout_array_type
PROTO((tree
));
429 /* C-specific option variables. */
431 /* Nonzero means allow type mismatches in conditional expressions;
432 just make their values `void'. */
434 int flag_cond_mismatch
;
436 /* Nonzero means give `double' the same size as `float'. */
438 int flag_short_double
;
440 /* Nonzero means don't recognize the keyword `asm'. */
444 /* Nonzero means don't recognize any builtin functions. */
448 /* Nonzero means don't recognize the non-ANSI builtin functions.
451 int flag_no_nonansi_builtin
;
453 /* Nonzero means do some things the same way PCC does. */
455 int flag_traditional
;
457 /* Nonzero means to allow single precision math even if we're generally
458 being traditional. */
459 int flag_allow_single_precision
= 0;
461 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
463 int flag_signed_bitfields
= 1;
464 int explicit_flag_signed_bitfields
= 0;
466 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
468 int flag_no_ident
= 0;
470 /* Nonzero means warn about implicit declarations. */
474 /* Nonzero means give string constants the type `const char *'
475 to get extra warnings from them. These warnings will be too numerous
476 to be useful, except in thoroughly ANSIfied programs. */
478 int warn_write_strings
;
480 /* Nonzero means warn about pointer casts that can drop a type qualifier
481 from the pointer target type. */
485 /* Nonzero means warn when casting a function call to a type that does
486 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
487 when there is no previous declaration of sqrt or malloc. */
489 int warn_bad_function_cast
;
491 /* Warn about traditional constructs whose meanings changed in ANSI C. */
493 int warn_traditional
;
495 /* Nonzero means warn about sizeof(function) or addition/subtraction
496 of function pointers. */
498 int warn_pointer_arith
;
500 /* Nonzero means warn for non-prototype function decls
501 or non-prototyped defs without previous prototype. */
503 int warn_strict_prototypes
;
505 /* Nonzero means warn for any global function def
506 without separate previous prototype decl. */
508 int warn_missing_prototypes
;
510 /* Nonzero means warn for any global function def
511 without separate previous decl. */
513 int warn_missing_declarations
;
515 /* Nonzero means warn about multiple (redundant) decls for the same single
516 variable or function. */
518 int warn_redundant_decls
= 0;
520 /* Nonzero means warn about extern declarations of objects not at
521 file-scope level and about *all* declarations of functions (whether
522 extern or static) not at file-scope level. Note that we exclude
523 implicit function declarations. To get warnings about those, use
526 int warn_nested_externs
= 0;
528 /* Warn about *printf or *scanf format/argument anomalies. */
532 /* Warn about a subscript that has type char. */
534 int warn_char_subscripts
= 0;
536 /* Warn if a type conversion is done that might have confusing results. */
540 /* Warn if adding () is suggested. */
542 int warn_parentheses
;
544 /* Warn if initializer is not completely bracketed. */
546 int warn_missing_braces
;
548 /* Warn about comparison of signed and unsigned values. */
550 int warn_sign_compare
;
552 /* Nonzero means `$' can be in an identifier.
553 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
555 #ifndef DOLLARS_IN_IDENTIFIERS
556 #define DOLLARS_IN_IDENTIFIERS 1
558 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
560 /* Decode the string P as a language-specific option for C.
561 Return 1 if it is recognized (and handle it);
562 return 0 if not recognized. */
568 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
570 flag_traditional
= 1;
571 flag_writable_strings
= 1;
572 #if DOLLARS_IN_IDENTIFIERS > 0
573 dollars_in_ident
= 1;
576 else if (!strcmp (p
, "-fallow-single-precision"))
577 flag_allow_single_precision
= 1;
578 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
580 flag_traditional
= 0;
581 flag_writable_strings
= 0;
582 dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
584 else if (!strcmp (p
, "-fdollars-in-identifiers"))
586 #if DOLLARS_IN_IDENTIFIERS > 0
587 dollars_in_ident
= 1;
590 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
591 dollars_in_ident
= 0;
592 else if (!strcmp (p
, "-fsigned-char"))
593 flag_signed_char
= 1;
594 else if (!strcmp (p
, "-funsigned-char"))
595 flag_signed_char
= 0;
596 else if (!strcmp (p
, "-fno-signed-char"))
597 flag_signed_char
= 0;
598 else if (!strcmp (p
, "-fno-unsigned-char"))
599 flag_signed_char
= 1;
600 else if (!strcmp (p
, "-fsigned-bitfields")
601 || !strcmp (p
, "-fno-unsigned-bitfields"))
603 flag_signed_bitfields
= 1;
604 explicit_flag_signed_bitfields
= 1;
606 else if (!strcmp (p
, "-funsigned-bitfields")
607 || !strcmp (p
, "-fno-signed-bitfields"))
609 flag_signed_bitfields
= 0;
610 explicit_flag_signed_bitfields
= 1;
612 else if (!strcmp (p
, "-fshort-enums"))
613 flag_short_enums
= 1;
614 else if (!strcmp (p
, "-fno-short-enums"))
615 flag_short_enums
= 0;
616 else if (!strcmp (p
, "-fcond-mismatch"))
617 flag_cond_mismatch
= 1;
618 else if (!strcmp (p
, "-fno-cond-mismatch"))
619 flag_cond_mismatch
= 0;
620 else if (!strcmp (p
, "-fshort-double"))
621 flag_short_double
= 1;
622 else if (!strcmp (p
, "-fno-short-double"))
623 flag_short_double
= 0;
624 else if (!strcmp (p
, "-fasm"))
626 else if (!strcmp (p
, "-fno-asm"))
628 else if (!strcmp (p
, "-fbuiltin"))
630 else if (!strcmp (p
, "-fno-builtin"))
632 else if (!strcmp (p
, "-fno-ident"))
634 else if (!strcmp (p
, "-fident"))
636 else if (!strcmp (p
, "-ansi"))
637 flag_no_asm
= 1, flag_no_nonansi_builtin
= 1, dollars_in_ident
= 0;
638 else if (!strcmp (p
, "-Wimplicit"))
640 else if (!strcmp (p
, "-Wno-implicit"))
642 else if (!strcmp (p
, "-Wwrite-strings"))
643 warn_write_strings
= 1;
644 else if (!strcmp (p
, "-Wno-write-strings"))
645 warn_write_strings
= 0;
646 else if (!strcmp (p
, "-Wcast-qual"))
648 else if (!strcmp (p
, "-Wno-cast-qual"))
650 else if (!strcmp (p
, "-Wbad-function-cast"))
651 warn_bad_function_cast
= 1;
652 else if (!strcmp (p
, "-Wno-bad-function-cast"))
653 warn_bad_function_cast
= 0;
654 else if (!strcmp (p
, "-Wpointer-arith"))
655 warn_pointer_arith
= 1;
656 else if (!strcmp (p
, "-Wno-pointer-arith"))
657 warn_pointer_arith
= 0;
658 else if (!strcmp (p
, "-Wstrict-prototypes"))
659 warn_strict_prototypes
= 1;
660 else if (!strcmp (p
, "-Wno-strict-prototypes"))
661 warn_strict_prototypes
= 0;
662 else if (!strcmp (p
, "-Wmissing-prototypes"))
663 warn_missing_prototypes
= 1;
664 else if (!strcmp (p
, "-Wno-missing-prototypes"))
665 warn_missing_prototypes
= 0;
666 else if (!strcmp (p
, "-Wmissing-declarations"))
667 warn_missing_declarations
= 1;
668 else if (!strcmp (p
, "-Wno-missing-declarations"))
669 warn_missing_declarations
= 0;
670 else if (!strcmp (p
, "-Wredundant-decls"))
671 warn_redundant_decls
= 1;
672 else if (!strcmp (p
, "-Wno-redundant-decls"))
673 warn_redundant_decls
= 0;
674 else if (!strcmp (p
, "-Wnested-externs"))
675 warn_nested_externs
= 1;
676 else if (!strcmp (p
, "-Wno-nested-externs"))
677 warn_nested_externs
= 0;
678 else if (!strcmp (p
, "-Wtraditional"))
679 warn_traditional
= 1;
680 else if (!strcmp (p
, "-Wno-traditional"))
681 warn_traditional
= 0;
682 else if (!strcmp (p
, "-Wformat"))
684 else if (!strcmp (p
, "-Wno-format"))
686 else if (!strcmp (p
, "-Wchar-subscripts"))
687 warn_char_subscripts
= 1;
688 else if (!strcmp (p
, "-Wno-char-subscripts"))
689 warn_char_subscripts
= 0;
690 else if (!strcmp (p
, "-Wconversion"))
692 else if (!strcmp (p
, "-Wno-conversion"))
694 else if (!strcmp (p
, "-Wparentheses"))
695 warn_parentheses
= 1;
696 else if (!strcmp (p
, "-Wno-parentheses"))
697 warn_parentheses
= 0;
698 else if (!strcmp (p
, "-Wreturn-type"))
699 warn_return_type
= 1;
700 else if (!strcmp (p
, "-Wno-return-type"))
701 warn_return_type
= 0;
702 else if (!strcmp (p
, "-Wcomment"))
703 ; /* cpp handles this one. */
704 else if (!strcmp (p
, "-Wno-comment"))
705 ; /* cpp handles this one. */
706 else if (!strcmp (p
, "-Wcomments"))
707 ; /* cpp handles this one. */
708 else if (!strcmp (p
, "-Wno-comments"))
709 ; /* cpp handles this one. */
710 else if (!strcmp (p
, "-Wtrigraphs"))
711 ; /* cpp handles this one. */
712 else if (!strcmp (p
, "-Wno-trigraphs"))
713 ; /* cpp handles this one. */
714 else if (!strcmp (p
, "-Wimport"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p
, "-Wno-import"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p
, "-Wmissing-braces"))
719 warn_missing_braces
= 1;
720 else if (!strcmp (p
, "-Wno-missing-braces"))
721 warn_missing_braces
= 0;
722 else if (!strcmp (p
, "-Wsign-compare"))
723 warn_sign_compare
= 1;
724 else if (!strcmp (p
, "-Wno-sign-compare"))
725 warn_sign_compare
= 0;
726 else if (!strcmp (p
, "-Wall"))
728 /* We save the value of warn_uninitialized, since if they put
729 -Wuninitialized on the command line, we need to generate a
730 warning about not using it without also specifying -O. */
731 if (warn_uninitialized
!= 1)
732 warn_uninitialized
= 2;
734 warn_return_type
= 1;
738 warn_char_subscripts
= 1;
739 warn_parentheses
= 1;
740 warn_missing_braces
= 1;
741 warn_sign_compare
= 1;
749 /* Hooks for print_node. */
752 print_lang_decl (file
, node
, indent
)
760 print_lang_type (file
, node
, indent
)
768 print_lang_identifier (file
, node
, indent
)
773 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
774 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
775 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
776 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
777 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
778 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
781 /* Hook called at end of compilation to assume 1 elt
782 for a top-level array decl that wasn't complete before. */
785 finish_incomplete_decl (decl
)
788 if (TREE_CODE (decl
) == VAR_DECL
)
790 tree type
= TREE_TYPE (decl
);
791 if (type
!= error_mark_node
792 && TREE_CODE (type
) == ARRAY_TYPE
793 && TYPE_DOMAIN (type
) == 0)
795 if (! DECL_EXTERNAL (decl
))
796 warning_with_decl (decl
, "array `%s' assumed to have one element");
798 complete_array_type (type
, NULL_TREE
, 1);
800 layout_decl (decl
, 0);
805 /* Create a new `struct binding_level'. */
808 struct binding_level
*
809 make_binding_level ()
812 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
815 /* Nonzero if we are currently in the global binding level. */
820 return current_binding_level
== global_binding_level
;
826 keep_next_level_flag
= 1;
829 /* Nonzero if the current level needs to have a BLOCK made. */
834 return ((current_binding_level
->keep_if_subblocks
835 && current_binding_level
->blocks
!= 0)
836 || current_binding_level
->keep
837 || current_binding_level
->names
!= 0
838 || (current_binding_level
->tags
!= 0
839 && !current_binding_level
->tag_transparent
));
842 /* Identify this binding level as a level of parameters.
843 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
844 But it turns out there is no way to pass the right value for
845 DEFINITION_FLAG, so we ignore it. */
848 declare_parm_level (definition_flag
)
851 current_binding_level
->parm_flag
= 1;
854 /* Nonzero if currently making parm declarations. */
859 return current_binding_level
->parm_flag
;
862 /* Enter a new binding level.
863 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
864 not for that of tags. */
867 pushlevel (tag_transparent
)
870 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
872 /* If this is the top level of a function,
873 just make sure that NAMED_LABELS is 0. */
875 if (current_binding_level
== global_binding_level
)
880 /* Reuse or create a struct for this binding level. */
882 if (free_binding_level
)
884 newlevel
= free_binding_level
;
885 free_binding_level
= free_binding_level
->level_chain
;
889 newlevel
= make_binding_level ();
892 /* Add this level to the front of the chain (stack) of levels that
895 *newlevel
= clear_binding_level
;
896 newlevel
->tag_transparent
898 || (current_binding_level
899 ? current_binding_level
->subblocks_tag_transparent
901 newlevel
->level_chain
= current_binding_level
;
902 current_binding_level
= newlevel
;
903 newlevel
->keep
= keep_next_level_flag
;
904 keep_next_level_flag
= 0;
905 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
906 keep_next_if_subblocks
= 0;
909 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
912 clear_limbo_values (block
)
917 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
918 if (DECL_NAME (tem
) != 0)
919 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
921 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
922 clear_limbo_values (tem
);
925 /* Exit a binding level.
926 Pop the level off, and restore the state of the identifier-decl mappings
927 that were in effect when this level was entered.
929 If KEEP is nonzero, this level had explicit declarations, so
930 and create a "block" (a BLOCK node) for the level
931 to record its declarations and subblocks for symbol table output.
933 If FUNCTIONBODY is nonzero, this level is the body of a function,
934 so create a block as if KEEP were set and also clear out all
937 If REVERSE is nonzero, reverse the order of decls before putting
938 them into the BLOCK. */
941 poplevel (keep
, reverse
, functionbody
)
947 /* The chain of decls was accumulated in reverse order.
948 Put it into forward order, just for cleanliness. */
950 tree tags
= current_binding_level
->tags
;
951 tree subblocks
= current_binding_level
->blocks
;
954 int block_previously_created
;
956 keep
|= current_binding_level
->keep
;
958 /* This warning is turned off because it causes warnings for
959 declarations like `extern struct foo *x'. */
961 /* Warn about incomplete structure types in this level. */
962 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
963 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
965 tree type
= TREE_VALUE (link
);
967 switch (TREE_CODE (type
))
970 errmsg
= "`struct %s' incomplete in scope ending here";
973 errmsg
= "`union %s' incomplete in scope ending here";
976 errmsg
= "`enum %s' incomplete in scope ending here";
979 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
980 error (errmsg
, IDENTIFIER_POINTER (TYPE_NAME (type
)));
982 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
983 error (errmsg
, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
))));
987 /* Get the decls in the order they were written.
988 Usually current_binding_level->names is in reverse order.
989 But parameter decls were previously put in forward order. */
992 current_binding_level
->names
993 = decls
= nreverse (current_binding_level
->names
);
995 decls
= current_binding_level
->names
;
997 /* Output any nested inline functions within this block
998 if they weren't already output. */
1000 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1001 if (TREE_CODE (decl
) == FUNCTION_DECL
1002 && ! TREE_ASM_WRITTEN (decl
)
1003 && DECL_INITIAL (decl
) != 0
1004 && TREE_ADDRESSABLE (decl
))
1006 /* If this decl was copied from a file-scope decl
1007 on account of a block-scope extern decl,
1008 propagate TREE_ADDRESSABLE to the file-scope decl.
1010 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1011 true, since then the decl goes through save_for_inline_copying. */
1012 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1013 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1014 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1017 push_function_context ();
1018 output_inline_function (decl
);
1019 pop_function_context ();
1023 /* If there were any declarations or structure tags in that level,
1024 or if this level is a function body,
1025 create a BLOCK to record them for the life of this function. */
1028 block_previously_created
= (current_binding_level
->this_block
!= 0);
1029 if (block_previously_created
)
1030 block
= current_binding_level
->this_block
;
1031 else if (keep
|| functionbody
1032 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1033 block
= make_node (BLOCK
);
1036 BLOCK_VARS (block
) = decls
;
1037 BLOCK_TYPE_TAGS (block
) = tags
;
1038 BLOCK_SUBBLOCKS (block
) = subblocks
;
1039 remember_end_note (block
);
1042 /* In each subblock, record that this is its superior. */
1044 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1045 BLOCK_SUPERCONTEXT (link
) = block
;
1047 /* Clear out the meanings of the local variables of this level. */
1049 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1051 if (DECL_NAME (link
) != 0)
1053 /* If the ident. was used or addressed via a local extern decl,
1054 don't forget that fact. */
1055 if (DECL_EXTERNAL (link
))
1057 if (TREE_USED (link
))
1058 TREE_USED (DECL_NAME (link
)) = 1;
1059 if (TREE_ADDRESSABLE (link
))
1060 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1062 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1066 /* Restore all name-meanings of the outer levels
1067 that were shadowed by this level. */
1069 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1070 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1072 /* If the level being exited is the top level of a function,
1073 check over all the labels, and clear out the current
1074 (function local) meanings of their names. */
1078 clear_limbo_values (block
);
1080 /* If this is the top level block of a function,
1081 the vars are the function's parameters.
1082 Don't leave them in the BLOCK because they are
1083 found in the FUNCTION_DECL instead. */
1085 BLOCK_VARS (block
) = 0;
1087 /* Clear out the definitions of all label names,
1088 since their scopes end here,
1089 and add them to BLOCK_VARS. */
1091 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1093 register tree label
= TREE_VALUE (link
);
1095 if (DECL_INITIAL (label
) == 0)
1097 error_with_decl (label
, "label `%s' used but not defined");
1098 /* Avoid crashing later. */
1099 define_label (input_filename
, lineno
,
1102 else if (warn_unused
&& !TREE_USED (label
))
1103 warning_with_decl (label
, "label `%s' defined but not used");
1104 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1106 /* Put the labels into the "variables" of the
1107 top-level block, so debugger can see them. */
1108 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1109 BLOCK_VARS (block
) = label
;
1113 /* Pop the current level, and free the structure for reuse. */
1116 register struct binding_level
*level
= current_binding_level
;
1117 current_binding_level
= current_binding_level
->level_chain
;
1119 level
->level_chain
= free_binding_level
;
1120 free_binding_level
= level
;
1123 /* Dispose of the block that we just made inside some higher level. */
1125 DECL_INITIAL (current_function_decl
) = block
;
1128 if (!block_previously_created
)
1129 current_binding_level
->blocks
1130 = chainon (current_binding_level
->blocks
, block
);
1132 /* If we did not make a block for the level just exited,
1133 any blocks made for inner levels
1134 (since they cannot be recorded as subblocks in that level)
1135 must be carried forward so they will later become subblocks
1136 of something else. */
1138 current_binding_level
->blocks
1139 = chainon (current_binding_level
->blocks
, subblocks
);
1141 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1142 binding contour so that they point to the appropriate construct, i.e.
1143 either to the current FUNCTION_DECL node, or else to the BLOCK node
1144 we just constructed.
1146 Note that for tagged types whose scope is just the formal parameter
1147 list for some function type specification, we can't properly set
1148 their TYPE_CONTEXTs here, because we don't have a pointer to the
1149 appropriate FUNCTION_TYPE node readily available to us. For those
1150 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1151 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1152 node which will represent the "scope" for these "parameter list local"
1157 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1158 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1160 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1161 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1164 TREE_USED (block
) = 1;
1168 /* Delete the node BLOCK from the current binding level.
1169 This is used for the block inside a stmt expr ({...})
1170 so that the block can be reinserted where appropriate. */
1173 delete_block (block
)
1177 if (current_binding_level
->blocks
== block
)
1178 current_binding_level
->blocks
= TREE_CHAIN (block
);
1179 for (t
= current_binding_level
->blocks
; t
;)
1181 if (TREE_CHAIN (t
) == block
)
1182 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1186 TREE_CHAIN (block
) = NULL
;
1187 /* Clear TREE_USED which is always set by poplevel.
1188 The flag is set again if insert_block is called. */
1189 TREE_USED (block
) = 0;
1192 /* Insert BLOCK at the end of the list of subblocks of the
1193 current binding level. This is used when a BIND_EXPR is expanded,
1194 to handle the BLOCK node inside the BIND_EXPR. */
1197 insert_block (block
)
1200 TREE_USED (block
) = 1;
1201 current_binding_level
->blocks
1202 = chainon (current_binding_level
->blocks
, block
);
1205 /* Set the BLOCK node for the innermost scope
1206 (the one we are currently in). */
1210 register tree block
;
1212 current_binding_level
->this_block
= block
;
1218 register struct binding_level
*newlevel
;
1220 /* Reuse or create a struct for this binding level. */
1222 if (free_binding_level
)
1224 newlevel
= free_binding_level
;
1225 free_binding_level
= free_binding_level
->level_chain
;
1229 newlevel
= make_binding_level ();
1232 /* Add this level to the front of the chain (stack) of label levels. */
1234 newlevel
->level_chain
= label_level_chain
;
1235 label_level_chain
= newlevel
;
1237 newlevel
->names
= named_labels
;
1238 newlevel
->shadowed
= shadowed_labels
;
1240 shadowed_labels
= 0;
1246 register struct binding_level
*level
= label_level_chain
;
1249 /* Clear out the definitions of the declared labels in this level.
1250 Leave in the list any ordinary, non-declared labels. */
1251 for (link
= named_labels
, prev
= 0; link
;)
1253 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1255 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1257 error_with_decl (TREE_VALUE (link
),
1258 "label `%s' used but not defined");
1259 /* Avoid crashing later. */
1260 define_label (input_filename
, lineno
,
1261 DECL_NAME (TREE_VALUE (link
)));
1263 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1264 warning_with_decl (TREE_VALUE (link
),
1265 "label `%s' defined but not used");
1266 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1268 /* Delete this element from the list. */
1269 link
= TREE_CHAIN (link
);
1271 TREE_CHAIN (prev
) = link
;
1273 named_labels
= link
;
1278 link
= TREE_CHAIN (link
);
1282 /* Bring back all the labels that were shadowed. */
1283 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1284 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1285 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1286 = TREE_VALUE (link
);
1288 named_labels
= chainon (named_labels
, level
->names
);
1289 shadowed_labels
= level
->shadowed
;
1291 /* Pop the current level, and free the structure for reuse. */
1292 label_level_chain
= label_level_chain
->level_chain
;
1293 level
->level_chain
= free_binding_level
;
1294 free_binding_level
= level
;
1297 /* Push a definition or a declaration of struct, union or enum tag "name".
1298 "type" should be the type node.
1299 We assume that the tag "name" is not already defined.
1301 Note that the definition may really be just a forward reference.
1302 In that case, the TYPE_SIZE will be zero. */
1305 pushtag (name
, type
)
1308 register struct binding_level
*b
;
1310 /* Find the proper binding level for this type tag. */
1312 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1317 /* Record the identifier as the type's name if it has none. */
1319 if (TYPE_NAME (type
) == 0)
1320 TYPE_NAME (type
) = name
;
1323 if (b
== global_binding_level
)
1324 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1326 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1328 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1329 tagged type we just added to the current binding level. This fake
1330 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1331 to output a representation of a tagged type, and it also gives
1332 us a convenient place to record the "scope start" address for the
1335 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1338 /* Handle when a new declaration NEWDECL
1339 has the same name as an old one OLDDECL
1340 in the same binding contour.
1341 Prints an error message if appropriate.
1343 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1344 Otherwise, return 0.
1346 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1347 and OLDDECL is in an outer binding level and should thus not be changed. */
1350 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1351 register tree newdecl
, olddecl
;
1352 int different_binding_level
;
1354 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1355 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1356 && DECL_INITIAL (newdecl
) != 0);
1357 tree oldtype
= TREE_TYPE (olddecl
);
1358 tree newtype
= TREE_TYPE (newdecl
);
1361 if (TREE_CODE_CLASS (TREE_CODE (olddecl
)) == 'd')
1362 DECL_MACHINE_ATTRIBUTES (newdecl
) = DECL_MACHINE_ATTRIBUTES (olddecl
);
1364 if (TREE_CODE (newtype
) == ERROR_MARK
1365 || TREE_CODE (oldtype
) == ERROR_MARK
)
1368 /* New decl is completely inconsistent with the old one =>
1369 tell caller to replace the old one.
1370 This is always an error except in the case of shadowing a builtin. */
1371 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1373 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1374 && (DECL_BUILT_IN (olddecl
)
1375 || DECL_BUILT_IN_NONANSI (olddecl
)))
1377 /* If you declare a built-in or predefined function name as static,
1378 the old definition is overridden,
1379 but optionally warn this was a bad choice of name. */
1380 if (!TREE_PUBLIC (newdecl
))
1384 else if (DECL_BUILT_IN (olddecl
))
1385 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1387 warning_with_decl (newdecl
, "shadowing library function `%s'");
1389 /* Likewise, if the built-in is not ansi, then programs can
1390 override it even globally without an error. */
1391 else if (! DECL_BUILT_IN (olddecl
))
1392 warning_with_decl (newdecl
,
1393 "library function `%s' declared as non-function");
1395 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1396 warning_with_decl (newdecl
,
1397 "built-in function `%s' declared as non-function");
1399 warning_with_decl (newdecl
,
1400 "built-in function `%s' declared as non-function");
1404 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1405 error_with_decl (olddecl
, "previous declaration of `%s'");
1411 /* For real parm decl following a forward decl,
1412 return 1 so old decl will be reused. */
1413 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1414 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1417 /* The new declaration is the same kind of object as the old one.
1418 The declarations may partially match. Print warnings if they don't
1419 match enough. Ultimately, copy most of the information from the new
1420 decl to the old one, and keep using the old one. */
1422 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1423 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1424 && DECL_INITIAL (olddecl
) == 0)
1425 /* If -traditional, avoid error for redeclaring fcn
1426 after implicit decl. */
1428 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1429 && DECL_BUILT_IN (olddecl
))
1431 /* A function declaration for a built-in function. */
1432 if (!TREE_PUBLIC (newdecl
))
1434 /* If you declare a built-in function name as static, the
1435 built-in definition is overridden,
1436 but optionally warn this was a bad choice of name. */
1438 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1439 /* Discard the old built-in function. */
1442 else if (!types_match
)
1444 /* Accept the return type of the new declaration if same modes. */
1445 tree oldreturntype
= TREE_TYPE (oldtype
);
1446 tree newreturntype
= TREE_TYPE (newtype
);
1448 /* Make sure we put the new type in the same obstack as the old ones.
1449 If the old types are not both in the same obstack, use the
1451 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1452 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1455 push_obstacks_nochange ();
1456 end_temporary_allocation ();
1459 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1461 /* Function types may be shared, so we can't just modify
1462 the return type of olddecl's function type. */
1464 = build_function_type (newreturntype
,
1465 TYPE_ARG_TYPES (oldtype
));
1467 types_match
= comptypes (newtype
, trytype
);
1471 /* Accept harmless mismatch in first argument type also.
1473 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1474 && TYPE_ARG_TYPES (oldtype
) != 0
1475 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1476 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1477 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1478 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1480 /* Function types may be shared, so we can't just modify
1481 the return type of olddecl's function type. */
1483 = build_function_type (TREE_TYPE (oldtype
),
1484 tree_cons (NULL_TREE
,
1485 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1486 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1488 types_match
= comptypes (newtype
, trytype
);
1492 if (! different_binding_level
)
1493 TREE_TYPE (olddecl
) = oldtype
;
1499 /* If types don't match for a built-in, throw away the built-in. */
1500 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1504 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1505 && DECL_SOURCE_LINE (olddecl
) == 0)
1507 /* A function declaration for a predeclared function
1508 that isn't actually built in. */
1509 if (!TREE_PUBLIC (newdecl
))
1511 /* If you declare it as static, the
1512 default definition is overridden. */
1515 else if (!types_match
)
1517 /* If the types don't match, preserve volatility indication.
1518 Later on, we will discard everything else about the
1519 default declaration. */
1520 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1523 /* Permit char *foo () to match void *foo (...) if not pedantic,
1524 if one of them came from a system header file. */
1525 else if (!types_match
1526 && TREE_CODE (olddecl
) == FUNCTION_DECL
1527 && TREE_CODE (newdecl
) == FUNCTION_DECL
1528 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1529 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1530 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1531 || DECL_IN_SYSTEM_HEADER (newdecl
))
1532 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1533 && TYPE_ARG_TYPES (oldtype
) == 0
1534 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1535 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1537 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1538 && TYPE_ARG_TYPES (newtype
) == 0
1539 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1540 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1543 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1544 /* Make sure we keep void * as ret type, not char *. */
1545 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1546 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1548 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1549 we will come back here again. */
1550 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1552 else if (!types_match
1553 /* Permit char *foo (int, ...); followed by char *foo ();
1555 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1557 /* Return types must still match. */
1558 && comptypes (TREE_TYPE (oldtype
),
1559 TREE_TYPE (newtype
))
1560 && TYPE_ARG_TYPES (newtype
) == 0))
1562 error_with_decl (newdecl
, "conflicting types for `%s'");
1563 /* Check for function type mismatch
1564 involving an empty arglist vs a nonempty one. */
1565 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1566 && comptypes (TREE_TYPE (oldtype
),
1567 TREE_TYPE (newtype
))
1568 && ((TYPE_ARG_TYPES (oldtype
) == 0
1569 && DECL_INITIAL (olddecl
) == 0)
1571 (TYPE_ARG_TYPES (newtype
) == 0
1572 && DECL_INITIAL (newdecl
) == 0)))
1574 /* Classify the problem further. */
1575 register tree t
= TYPE_ARG_TYPES (oldtype
);
1577 t
= TYPE_ARG_TYPES (newtype
);
1578 for (; t
; t
= TREE_CHAIN (t
))
1580 register tree type
= TREE_VALUE (t
);
1582 if (TREE_CHAIN (t
) == 0
1583 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1585 error ("A parameter list with an ellipsis can't match");
1586 error ("an empty parameter name list declaration.");
1590 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1591 || C_PROMOTING_INTEGER_TYPE_P (type
))
1593 error ("An argument type that has a default promotion");
1594 error ("can't match an empty parameter name list declaration.");
1599 error_with_decl (olddecl
, "previous declaration of `%s'");
1603 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1606 error_with_decl (newdecl
, errmsg
);
1607 error_with_decl (olddecl
,
1608 ((DECL_INITIAL (olddecl
)
1609 && current_binding_level
== global_binding_level
)
1610 ? "`%s' previously defined here"
1611 : "`%s' previously declared here"));
1613 else if (TREE_CODE (newdecl
) == TYPE_DECL
1614 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1615 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1617 warning_with_decl (newdecl
, "redefinition of `%s'");
1620 ((DECL_INITIAL (olddecl
)
1621 && current_binding_level
== global_binding_level
)
1622 ? "`%s' previously defined here"
1623 : "`%s' previously declared here"));
1625 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1626 && DECL_INITIAL (olddecl
) != 0
1627 && TYPE_ARG_TYPES (oldtype
) == 0
1628 && TYPE_ARG_TYPES (newtype
) != 0
1629 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1631 register tree type
, parm
;
1633 /* Prototype decl follows defn w/o prototype. */
1635 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1636 type
= TYPE_ARG_TYPES (newtype
),
1638 (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) != void_type_node
1639 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
1640 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1642 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1643 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1645 errmsg
= "prototype for `%s' follows and number of arguments";
1648 /* Type for passing arg must be consistent
1649 with that declared for the arg. */
1650 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1651 /* If -traditional, allow `unsigned int' instead of `int'
1652 in the prototype. */
1653 && (! (flag_traditional
1654 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1655 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1657 errmsg
= "prototype for `%s' follows and argument %d";
1663 error_with_decl (newdecl
, errmsg
, nargs
);
1664 error_with_decl (olddecl
,
1665 "doesn't match non-prototype definition here");
1669 warning_with_decl (newdecl
, "prototype for `%s' follows");
1670 warning_with_decl (olddecl
, "non-prototype definition here");
1673 /* Warn about mismatches in various flags. */
1676 /* Warn if function is now inline
1677 but was previously declared not inline and has been called. */
1678 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1679 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1680 && TREE_USED (olddecl
))
1681 warning_with_decl (newdecl
,
1682 "`%s' declared inline after being called");
1683 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1684 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1685 && DECL_INITIAL (olddecl
) != 0)
1686 warning_with_decl (newdecl
,
1687 "`%s' declared inline after its definition");
1689 /* If pedantic, warn when static declaration follows a non-static
1690 declaration. Otherwise, do so only for functions. */
1691 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1692 && TREE_PUBLIC (olddecl
)
1693 && !TREE_PUBLIC (newdecl
))
1694 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1696 /* Warn when const declaration follows a non-const
1697 declaration, but not for functions. */
1698 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1699 && !TREE_READONLY (olddecl
)
1700 && TREE_READONLY (newdecl
))
1701 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1702 /* These bits are logically part of the type, for variables.
1703 But not for functions
1704 (where qualifiers are not valid ANSI anyway). */
1705 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1706 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1707 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1708 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1712 /* Optionally warn about more than one declaration for the same name. */
1713 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1714 /* Dont warn about a function declaration
1715 followed by a definition. */
1716 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1717 && DECL_INITIAL (olddecl
) == 0)
1718 /* Don't warn about extern decl followed by (tentative) definition. */
1719 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1721 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1722 warning_with_decl (olddecl
, "previous declaration of `%s'");
1725 /* Copy all the DECL_... slots specified in the new decl
1726 except for any that we copy here from the old type.
1728 Past this point, we don't change OLDTYPE and NEWTYPE
1729 even if we change the types of NEWDECL and OLDDECL. */
1733 /* When copying info to olddecl, we store into write_olddecl
1734 instead. This allows us to avoid modifying olddecl when
1735 different_binding_level is true. */
1736 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1738 /* Make sure we put the new type in the same obstack as the old ones.
1739 If the old types are not both in the same obstack, use the permanent
1741 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1742 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1745 push_obstacks_nochange ();
1746 end_temporary_allocation ();
1749 /* Merge the data types specified in the two decls. */
1750 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1752 if (different_binding_level
)
1754 = build_type_attribute_variant
1756 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1757 TYPE_ATTRIBUTES (oldtype
)));
1760 = TREE_TYPE (olddecl
)
1761 = common_type (newtype
, oldtype
);
1764 /* Lay the type out, unless already done. */
1765 if (oldtype
!= TREE_TYPE (newdecl
))
1767 if (TREE_TYPE (newdecl
) != error_mark_node
)
1768 layout_type (TREE_TYPE (newdecl
));
1769 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1770 && TREE_CODE (newdecl
) != TYPE_DECL
1771 && TREE_CODE (newdecl
) != CONST_DECL
)
1772 layout_decl (newdecl
, 0);
1776 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1777 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1778 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1779 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1780 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1783 /* Keep the old rtl since we can safely use it. */
1784 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1786 /* Merge the type qualifiers. */
1787 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1788 && !TREE_THIS_VOLATILE (newdecl
))
1789 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1790 if (TREE_READONLY (newdecl
))
1791 TREE_READONLY (write_olddecl
) = 1;
1792 if (TREE_THIS_VOLATILE (newdecl
))
1794 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1795 if (TREE_CODE (newdecl
) == VAR_DECL
)
1796 make_var_volatile (newdecl
);
1799 /* Keep source location of definition rather than declaration. */
1800 /* When called with different_binding_level set, keep the old
1801 information so that meaningful diagnostics can be given. */
1802 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1803 && ! different_binding_level
)
1805 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1806 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1809 /* Merge the unused-warning information. */
1810 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1811 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1812 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1813 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1815 /* Merge the initialization information. */
1816 /* When called with different_binding_level set, don't copy over
1817 DECL_INITIAL, so that we don't accidentally change function
1818 declarations into function definitions. */
1819 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1820 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1822 /* Merge the section attribute.
1823 We want to issue an error if the sections conflict but that must be
1824 done later in decl_attributes since we are called before attributes
1826 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1827 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1829 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1831 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1832 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1837 /* If cannot merge, then use the new type and qualifiers,
1838 and don't preserve the old rtl. */
1839 else if (! different_binding_level
)
1841 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1842 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1843 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1844 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1847 /* Merge the storage class information. */
1848 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1849 /* For functions, static overrides non-static. */
1850 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1852 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1853 /* This is since we don't automatically
1854 copy the attributes of NEWDECL into OLDDECL. */
1855 /* No need to worry about different_binding_level here because
1856 then TREE_PUBLIC (newdecl) was true. */
1857 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1858 /* If this clears `static', clear it in the identifier too. */
1859 if (! TREE_PUBLIC (olddecl
))
1860 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1862 if (DECL_EXTERNAL (newdecl
))
1864 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1865 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1866 /* An extern decl does not override previous storage class. */
1867 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1868 if (! DECL_EXTERNAL (newdecl
))
1869 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1873 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1874 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1877 /* If either decl says `inline', this fn is inline,
1878 unless its definition was passed already. */
1879 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1880 DECL_INLINE (olddecl
) = 1;
1881 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1883 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1885 if (DECL_BUILT_IN (olddecl
))
1887 /* Get rid of any built-in function if new arg types don't match it
1888 or if we have a function definition. */
1889 if (! types_match
|| new_is_definition
)
1891 if (! different_binding_level
)
1893 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1894 DECL_BUILT_IN (olddecl
) = 0;
1899 /* If redeclaring a builtin function, and not a definition,
1900 it stays built in. */
1901 DECL_BUILT_IN (newdecl
) = 1;
1902 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1905 /* Also preserve various other info from the definition. */
1906 else if (! new_is_definition
)
1907 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1908 if (! new_is_definition
)
1910 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1911 /* When called with different_binding_level set, don't copy over
1912 DECL_INITIAL, so that we don't accidentally change function
1913 declarations into function definitions. */
1914 if (! different_binding_level
)
1915 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1916 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1917 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1920 if (different_binding_level
)
1922 /* Don't output a duplicate symbol for this declaration. */
1923 TREE_ASM_WRITTEN (newdecl
) = 1;
1927 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1928 But preserve OLDdECL's DECL_UID. */
1930 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1932 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1933 (char *) olddecl
+ sizeof (struct tree_common
),
1934 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1935 DECL_UID (olddecl
) = olddecl_uid
;
1941 /* Record a decl-node X as belonging to the current lexical scope.
1942 Check for errors (such as an incompatible declaration for the same
1943 name already seen in the same scope).
1945 Returns either X or an old decl for the same name.
1946 If an old decl is returned, it may have been smashed
1947 to agree with what X says. */
1954 register tree name
= DECL_NAME (x
);
1955 register struct binding_level
*b
= current_binding_level
;
1957 DECL_CONTEXT (x
) = current_function_decl
;
1958 /* A local extern declaration for a function doesn't constitute nesting.
1959 A local auto declaration does, since it's a forward decl
1960 for a nested function coming later. */
1961 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
1962 && DECL_EXTERNAL (x
))
1963 DECL_CONTEXT (x
) = 0;
1965 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
1966 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
1967 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1968 && !DECL_IN_SYSTEM_HEADER (x
))
1969 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
1975 int different_binding_level
= 0;
1977 t
= lookup_name_current_level (name
);
1978 /* Don't type check externs here when -traditional. This is so that
1979 code with conflicting declarations inside blocks will get warnings
1980 not errors. X11 for instance depends on this. */
1981 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
1983 t
= IDENTIFIER_GLOBAL_VALUE (name
);
1984 /* Type decls at global scope don't conflict with externs declared
1985 inside lexical blocks. */
1986 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
1988 different_binding_level
= 1;
1990 if (t
!= 0 && t
== error_mark_node
)
1991 /* error_mark_node is 0 for a while during initialization! */
1994 error_with_decl (x
, "`%s' used prior to declaration");
1999 file
= DECL_SOURCE_FILE (t
);
2000 line
= DECL_SOURCE_LINE (t
);
2003 /* If this decl is `static' and an implicit decl was seen previously,
2004 warn. But don't complain if -traditional,
2005 since traditional compilers don't complain. */
2006 if (! flag_traditional
&& TREE_PUBLIC (name
)
2007 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2008 sets this for all functions. */
2009 && ! TREE_PUBLIC (x
)
2010 /* We used to warn also for explicit extern followed by static,
2011 but sometimes you need to do it that way. */
2012 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2014 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2015 IDENTIFIER_POINTER (name
));
2016 pedwarn_with_file_and_line
2017 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2018 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2019 "previous declaration of `%s'",
2020 IDENTIFIER_POINTER (name
));
2023 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2025 if (TREE_CODE (t
) == PARM_DECL
)
2027 /* Don't allow more than one "real" duplicate
2028 of a forward parm decl. */
2029 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2035 /* If we are processing a typedef statement, generate a whole new
2036 ..._TYPE node (which will be just an variant of the existing
2037 ..._TYPE node with identical properties) and then install the
2038 TYPE_DECL node generated to represent the typedef name as the
2039 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2041 The whole point here is to end up with a situation where each
2042 and every ..._TYPE node the compiler creates will be uniquely
2043 associated with AT MOST one node representing a typedef name.
2044 This way, even though the compiler substitutes corresponding
2045 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2046 early on, later parts of the compiler can always do the reverse
2047 translation and get back the corresponding typedef name. For
2050 typedef struct S MY_TYPE;
2053 Later parts of the compiler might only know that `object' was of
2054 type `struct S' if if were not for code just below. With this
2055 code however, later parts of the compiler see something like:
2057 struct S' == struct S
2058 typedef struct S' MY_TYPE;
2061 And they can then deduce (from the node for type struct S') that
2062 the original object declaration was:
2066 Being able to do this is important for proper support of protoize,
2067 and also for generating precise symbolic debugging information
2068 which takes full account of the programmer's (typedef) vocabulary.
2070 Obviously, we don't want to generate a duplicate ..._TYPE node if
2071 the TYPE_DECL node that we are now processing really represents a
2072 standard built-in type.
2074 Since all standard types are effectively declared at line zero
2075 in the source file, we can easily check to see if we are working
2076 on a standard type by checking the current value of lineno. */
2078 if (TREE_CODE (x
) == TYPE_DECL
)
2080 if (DECL_SOURCE_LINE (x
) == 0)
2082 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2083 TYPE_NAME (TREE_TYPE (x
)) = x
;
2085 else if (TREE_TYPE (x
) != error_mark_node
)
2087 tree tt
= TREE_TYPE (x
);
2088 DECL_ORIGINAL_TYPE (x
) = tt
;
2089 tt
= build_type_copy (tt
);
2095 /* Multiple external decls of the same identifier ought to match.
2096 Check against both global declarations (when traditional) and out of
2097 scope (limbo) block level declarations.
2099 We get warnings about inline functions where they are defined.
2100 Avoid duplicate warnings where they are used. */
2101 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
))
2105 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2106 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2107 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2108 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2109 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2110 /* Decls in limbo are always extern, so no need to check that. */
2111 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2115 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2116 /* If old decl is built-in, we already warned if we should. */
2117 && !DECL_BUILT_IN (decl
))
2119 pedwarn_with_decl (x
,
2120 "type mismatch with previous external decl");
2121 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2125 /* If a function has had an implicit declaration, and then is defined,
2126 make sure they are compatible. */
2128 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2129 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2130 && TREE_CODE (x
) == FUNCTION_DECL
2131 && ! comptypes (TREE_TYPE (x
),
2132 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2134 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2135 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2136 "previous implicit declaration of `%s'");
2139 /* In PCC-compatibility mode, extern decls of vars with no current decl
2140 take effect at top level no matter where they are. */
2141 if (flag_traditional
&& DECL_EXTERNAL (x
)
2142 && lookup_name (name
) == 0)
2144 tree type
= TREE_TYPE (x
);
2146 /* But don't do this if the type contains temporary nodes. */
2149 if (type
== error_mark_node
)
2151 if (! TREE_PERMANENT (type
))
2153 warning_with_decl (x
, "type of external `%s' is not global");
2154 /* By exiting the loop early, we leave TYPE nonzero,
2155 and thus prevent globalization of the decl. */
2158 else if (TREE_CODE (type
) == FUNCTION_TYPE
2159 && TYPE_ARG_TYPES (type
) != 0)
2160 /* The types might not be truly local,
2161 but the list of arg types certainly is temporary.
2162 Since prototypes are nontraditional,
2163 ok not to do the traditional thing. */
2165 type
= TREE_TYPE (type
);
2169 b
= global_binding_level
;
2172 /* This name is new in its binding level.
2173 Install the new declaration and return it. */
2174 if (b
== global_binding_level
)
2176 /* Install a global value. */
2178 /* If the first global decl has external linkage,
2179 warn if we later see static one. */
2180 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2181 TREE_PUBLIC (name
) = 1;
2183 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2185 /* We no longer care about any previous block level declarations. */
2186 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2188 /* Don't forget if the function was used via an implicit decl. */
2189 if (IDENTIFIER_IMPLICIT_DECL (name
)
2190 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2191 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2193 /* Don't forget if its address was taken in that way. */
2194 if (IDENTIFIER_IMPLICIT_DECL (name
)
2195 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2196 TREE_ADDRESSABLE (x
) = 1;
2198 /* Warn about mismatches against previous implicit decl. */
2199 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2200 /* If this real decl matches the implicit, don't complain. */
2201 && ! (TREE_CODE (x
) == FUNCTION_DECL
2202 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2203 == integer_type_node
)))
2204 pedwarn ("`%s' was previously implicitly declared to return `int'",
2205 IDENTIFIER_POINTER (name
));
2207 /* If this decl is `static' and an `extern' was seen previously,
2208 that is erroneous. */
2209 if (TREE_PUBLIC (name
)
2210 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2212 /* Okay to redeclare an ANSI built-in as static. */
2213 if (t
!= 0 && DECL_BUILT_IN (t
))
2215 /* Okay to declare a non-ANSI built-in as anything. */
2216 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2218 /* Okay to have global type decl after an earlier extern
2219 declaration inside a lexical block. */
2220 else if (TREE_CODE (x
) == TYPE_DECL
)
2222 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2223 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2224 IDENTIFIER_POINTER (name
));
2226 pedwarn ("`%s' was declared `extern' and later `static'",
2227 IDENTIFIER_POINTER (name
));
2232 /* Here to install a non-global value. */
2233 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2234 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2235 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2237 /* If this is an extern function declaration, see if we
2238 have a global definition or declaration for the function. */
2240 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2242 && TREE_CODE (x
) == FUNCTION_DECL
2243 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2245 /* We have one. Their types must agree. */
2246 if (! comptypes (TREE_TYPE (x
),
2247 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2248 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2251 /* Inner extern decl is inline if global one is.
2252 Copy enough to really inline it. */
2253 if (DECL_INLINE (oldglobal
))
2255 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2256 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2257 ? 0 : DECL_INITIAL (oldglobal
));
2258 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2259 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2260 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2261 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2262 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2263 DECL_ABSTRACT_ORIGIN (x
) = oldglobal
;
2265 /* Inner extern decl is built-in if global one is. */
2266 if (DECL_BUILT_IN (oldglobal
))
2268 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2269 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2271 /* Keep the arg types from a file-scope fcn defn. */
2272 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2273 && DECL_INITIAL (oldglobal
)
2274 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2275 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2279 #if 0 /* This case is probably sometimes the right thing to do. */
2280 /* If we have a local external declaration,
2281 then any file-scope declaration should not
2282 have been static. */
2283 if (oldlocal
== 0 && oldglobal
!= 0
2284 && !TREE_PUBLIC (oldglobal
)
2285 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2286 warning ("`%s' locally external but globally static",
2287 IDENTIFIER_POINTER (name
));
2290 /* If we have a local external declaration,
2291 and no file-scope declaration has yet been seen,
2292 then if we later have a file-scope decl it must not be static. */
2294 && DECL_EXTERNAL (x
)
2298 TREE_PUBLIC (name
) = 1;
2300 /* Save this decl, so that we can do type checking against
2301 other decls after it falls out of scope.
2303 Only save it once. This prevents temporary decls created in
2304 expand_inline_function from being used here, since this
2305 will have been set when the inline function was parsed.
2306 It also helps give slightly better warnings. */
2307 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2308 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2311 /* Warn if shadowing an argument at the top level of the body. */
2312 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2313 /* This warning doesn't apply to the parms of a nested fcn. */
2314 && ! current_binding_level
->parm_flag
2315 /* Check that this is one level down from the parms. */
2316 && current_binding_level
->level_chain
->parm_flag
2317 /* Check that the decl being shadowed
2318 comes from the parm level, one level up. */
2319 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2321 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2322 pedwarn ("declaration of `%s' shadows a parameter",
2323 IDENTIFIER_POINTER (name
));
2325 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2326 IDENTIFIER_POINTER (name
));
2329 /* Maybe warn if shadowing something else. */
2330 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2331 /* No shadow warnings for internally generated vars. */
2332 && DECL_SOURCE_LINE (x
) != 0
2333 /* No shadow warnings for vars made for inlining. */
2334 && ! DECL_FROM_INLINE (x
))
2336 char *warnstring
= 0;
2338 if (TREE_CODE (x
) == PARM_DECL
2339 && current_binding_level
->level_chain
->parm_flag
)
2340 /* Don't warn about the parm names in function declarator
2341 within a function declarator.
2342 It would be nice to avoid warning in any function
2343 declarator in a declaration, as opposed to a definition,
2344 but there is no way to tell it's not a definition. */
2346 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2347 warnstring
= "declaration of `%s' shadows a parameter";
2348 else if (oldlocal
!= 0)
2349 warnstring
= "declaration of `%s' shadows previous local";
2350 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2351 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2352 warnstring
= "declaration of `%s' shadows global declaration";
2355 warning (warnstring
, IDENTIFIER_POINTER (name
));
2358 /* If storing a local value, there may already be one (inherited).
2359 If so, record it for restoration when this binding level ends. */
2361 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2364 /* Keep count of variables in this level with incomplete type. */
2365 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2369 /* Put decls on list in reverse order.
2370 We will reverse them later if necessary. */
2371 TREE_CHAIN (x
) = b
->names
;
2377 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2380 pushdecl_top_level (x
)
2384 register struct binding_level
*b
= current_binding_level
;
2386 current_binding_level
= global_binding_level
;
2388 current_binding_level
= b
;
2392 /* Generate an implicit declaration for identifier FUNCTIONID
2393 as a function of type int (). Print a warning if appropriate. */
2396 implicitly_declare (functionid
)
2400 int traditional_warning
= 0;
2401 /* Only one "implicit declaration" warning per identifier. */
2402 int implicit_warning
;
2404 /* Save the decl permanently so we can warn if definition follows. */
2405 push_obstacks_nochange ();
2406 end_temporary_allocation ();
2408 /* We used to reuse an old implicit decl here,
2409 but this loses with inline functions because it can clobber
2410 the saved decl chains. */
2411 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2412 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2414 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2416 /* Warn of implicit decl following explicit local extern decl.
2417 This is probably a program designed for traditional C. */
2418 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2419 traditional_warning
= 1;
2421 /* Warn once of an implicit declaration. */
2422 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2424 DECL_EXTERNAL (decl
) = 1;
2425 TREE_PUBLIC (decl
) = 1;
2427 /* Record that we have an implicit decl and this is it. */
2428 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2430 /* ANSI standard says implicit declarations are in the innermost block.
2431 So we record the decl in the standard fashion.
2432 If flag_traditional is set, pushdecl does it top-level. */
2435 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2436 maybe_objc_check_decl (decl
);
2438 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2440 if (warn_implicit
&& implicit_warning
)
2441 warning ("implicit declaration of function `%s'",
2442 IDENTIFIER_POINTER (functionid
));
2443 else if (warn_traditional
&& traditional_warning
)
2444 warning ("function `%s' was previously declared within a block",
2445 IDENTIFIER_POINTER (functionid
));
2447 /* Write a record describing this implicit function declaration to the
2448 prototypes file (if requested). */
2450 gen_aux_info_record (decl
, 0, 1, 0);
2457 /* Return zero if the declaration NEWDECL is valid
2458 when the declaration OLDDECL (assumed to be for the same name)
2459 has already been seen.
2460 Otherwise return an error message format string with a %s
2461 where the identifier should go. */
2464 redeclaration_error_message (newdecl
, olddecl
)
2465 tree newdecl
, olddecl
;
2467 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2469 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2471 /* pushdecl creates distinct types for TYPE_DECLs by calling
2472 build_type_copy, so the above comparison generally fails. We do
2473 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2474 is equivalent to what this code used to do before the build_type_copy
2475 call. The variant type distinction should not matter for traditional
2476 code, because it doesn't have type qualifiers. */
2477 if (flag_traditional
2478 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2480 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2482 return "redefinition of `%s'";
2484 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2486 /* Declarations of functions can insist on internal linkage
2487 but they can't be inconsistent with internal linkage,
2488 so there can be no error on that account.
2489 However defining the same name twice is no good. */
2490 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2491 /* However, defining once as extern inline and a second
2492 time in another way is ok. */
2493 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2494 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2495 return "redefinition of `%s'";
2498 else if (current_binding_level
== global_binding_level
)
2500 /* Objects declared at top level: */
2501 /* If at least one is a reference, it's ok. */
2502 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2504 /* Reject two definitions. */
2505 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2506 return "redefinition of `%s'";
2507 /* Now we have two tentative defs, or one tentative and one real def. */
2508 /* Insist that the linkage match. */
2509 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2510 return "conflicting declarations of `%s'";
2513 else if (current_binding_level
->parm_flag
2514 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2518 /* Newdecl has block scope. If olddecl has block scope also, then
2519 reject two definitions, and reject a definition together with an
2520 external reference. Otherwise, it is OK, because newdecl must
2521 be an extern reference to olddecl. */
2522 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2523 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2524 return "redeclaration of `%s'";
2529 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2530 Create one if none exists so far for the current function.
2531 This function is called for both label definitions and label references. */
2537 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2539 if (current_function_decl
== 0)
2541 error ("label %s referenced outside of any function",
2542 IDENTIFIER_POINTER (id
));
2546 /* Use a label already defined or ref'd with this name. */
2549 /* But not if it is inherited and wasn't declared to be inheritable. */
2550 if (DECL_CONTEXT (decl
) != current_function_decl
2551 && ! C_DECLARED_LABEL_FLAG (decl
))
2552 return shadow_label (id
);
2556 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2558 /* Make sure every label has an rtx. */
2561 /* A label not explicitly declared must be local to where it's ref'd. */
2562 DECL_CONTEXT (decl
) = current_function_decl
;
2564 DECL_MODE (decl
) = VOIDmode
;
2566 /* Say where one reference is to the label,
2567 for the sake of the error if it is not defined. */
2568 DECL_SOURCE_LINE (decl
) = lineno
;
2569 DECL_SOURCE_FILE (decl
) = input_filename
;
2571 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2573 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2578 /* Make a label named NAME in the current function,
2579 shadowing silently any that may be inherited from containing functions
2580 or containing scopes.
2582 Note that valid use, if the label being shadowed
2583 comes from another scope in the same function,
2584 requires calling declare_nonlocal_label right away. */
2590 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2596 /* Check to make sure that the label hasn't already been declared
2597 at this label scope */
2598 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2599 if (TREE_VALUE (dup
) == decl
)
2601 error ("duplicate label declaration `%s'",
2602 IDENTIFIER_POINTER (name
));
2603 error_with_decl (TREE_VALUE (dup
),
2604 "this is a previous declaration");
2605 /* Just use the previous declaration. */
2606 return lookup_label (name
);
2609 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2610 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2613 return lookup_label (name
);
2616 /* Define a label, specifying the location in the source file.
2617 Return the LABEL_DECL node for the label, if the definition is valid.
2618 Otherwise return 0. */
2621 define_label (filename
, line
, name
)
2626 tree decl
= lookup_label (name
);
2628 /* If label with this name is known from an outer context, shadow it. */
2629 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2631 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2632 IDENTIFIER_LABEL_VALUE (name
) = 0;
2633 decl
= lookup_label (name
);
2636 if (DECL_INITIAL (decl
) != 0)
2638 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2643 /* Mark label as having been defined. */
2644 DECL_INITIAL (decl
) = error_mark_node
;
2645 /* Say where in the source. */
2646 DECL_SOURCE_FILE (decl
) = filename
;
2647 DECL_SOURCE_LINE (decl
) = line
;
2652 /* Return the list of declarations of the current level.
2653 Note that this list is in reverse order unless/until
2654 you nreverse it; and when you do nreverse it, you must
2655 store the result back using `storedecls' or you will lose. */
2660 return current_binding_level
->names
;
2663 /* Return the list of type-tags (for structs, etc) of the current level. */
2668 return current_binding_level
->tags
;
2671 /* Store the list of declarations of the current level.
2672 This is done for the parameter declarations of a function being defined,
2673 after they are modified in the light of any missing parameters. */
2679 current_binding_level
->names
= decls
;
2682 /* Similarly, store the list of tags of the current level. */
2688 current_binding_level
->tags
= tags
;
2691 /* Given NAME, an IDENTIFIER_NODE,
2692 return the structure (or union or enum) definition for that name.
2693 Searches binding levels from BINDING_LEVEL up to the global level.
2694 If THISLEVEL_ONLY is nonzero, searches only the specified context
2695 (but skips any tag-transparent contexts to find one that is
2696 meaningful for tags).
2697 CODE says which kind of type the caller wants;
2698 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2699 If the wrong kind of type is found, an error is reported. */
2702 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2703 enum tree_code code
;
2704 struct binding_level
*binding_level
;
2708 register struct binding_level
*level
;
2710 for (level
= binding_level
; level
; level
= level
->level_chain
)
2713 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2715 if (TREE_PURPOSE (tail
) == name
)
2717 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2719 /* Definition isn't the kind we were looking for. */
2720 pending_invalid_xref
= name
;
2721 pending_invalid_xref_file
= input_filename
;
2722 pending_invalid_xref_line
= lineno
;
2724 return TREE_VALUE (tail
);
2727 if (thislevel_only
&& ! level
->tag_transparent
)
2733 /* Print an error message now
2734 for a recent invalid struct, union or enum cross reference.
2735 We don't print them immediately because they are not invalid
2736 when used in the `struct foo;' construct for shadowing. */
2739 pending_xref_error ()
2741 if (pending_invalid_xref
!= 0)
2742 error_with_file_and_line (pending_invalid_xref_file
,
2743 pending_invalid_xref_line
,
2744 "`%s' defined as wrong kind of tag",
2745 IDENTIFIER_POINTER (pending_invalid_xref
));
2746 pending_invalid_xref
= 0;
2749 /* Given a type, find the tag that was defined for it and return the tag name.
2750 Otherwise return 0. */
2753 lookup_tag_reverse (type
)
2756 register struct binding_level
*level
;
2758 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2761 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2763 if (TREE_VALUE (tail
) == type
)
2764 return TREE_PURPOSE (tail
);
2770 /* Look up NAME in the current binding level and its superiors
2771 in the namespace of variables, functions and typedefs.
2772 Return a ..._DECL node of some kind representing its definition,
2773 or return 0 if it is undefined. */
2780 if (current_binding_level
!= global_binding_level
2781 && IDENTIFIER_LOCAL_VALUE (name
))
2782 val
= IDENTIFIER_LOCAL_VALUE (name
);
2784 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2788 /* Similar to `lookup_name' but look only at current binding level. */
2791 lookup_name_current_level (name
)
2796 if (current_binding_level
== global_binding_level
)
2797 return IDENTIFIER_GLOBAL_VALUE (name
);
2799 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2802 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2803 if (DECL_NAME (t
) == name
)
2809 /* Create the predefined scalar types of C,
2810 and some nodes representing standard constants (0, 1, (void *)0).
2811 Initialize the global binding level.
2812 Make definitions for built-in primitive functions. */
2815 init_decl_processing ()
2817 register tree endlink
;
2818 /* Either char* or void*. */
2819 tree traditional_ptr_type_node
;
2820 /* Data types of memcpy and strlen. */
2821 tree memcpy_ftype
, strlen_ftype
;
2822 tree void_ftype_any
;
2823 int wchar_type_size
;
2825 tree array_domain_type
;
2827 current_function_decl
= NULL
;
2828 named_labels
= NULL
;
2829 current_binding_level
= NULL_BINDING_LEVEL
;
2830 free_binding_level
= NULL_BINDING_LEVEL
;
2831 pushlevel (0); /* make the binding_level structure for global names */
2832 global_binding_level
= current_binding_level
;
2834 /* Define `int' and `char' first so that dbx will output them first. */
2836 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2837 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2838 integer_type_node
));
2840 /* Define `char', which is like either `signed char' or `unsigned char'
2841 but not the same as either. */
2845 ? make_signed_type (CHAR_TYPE_SIZE
)
2846 : make_unsigned_type (CHAR_TYPE_SIZE
));
2847 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2850 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2851 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2852 long_integer_type_node
));
2854 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2855 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2856 unsigned_type_node
));
2858 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
2859 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2860 long_unsigned_type_node
));
2862 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
2863 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2864 long_long_integer_type_node
));
2866 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
2867 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2868 long_long_unsigned_type_node
));
2870 /* `unsigned long' is the standard type for sizeof.
2871 Traditionally, use a signed type.
2872 Note that stddef.h uses `unsigned long',
2873 and this must agree, even of long and int are the same size. */
2875 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2876 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
2877 sizetype
= signed_type (sizetype
);
2880 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
2882 TREE_TYPE (TYPE_SIZE (integer_type_node
)) = sizetype
;
2883 TREE_TYPE (TYPE_SIZE (char_type_node
)) = sizetype
;
2884 TREE_TYPE (TYPE_SIZE (unsigned_type_node
)) = sizetype
;
2885 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node
)) = sizetype
;
2886 TREE_TYPE (TYPE_SIZE (long_integer_type_node
)) = sizetype
;
2887 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node
)) = sizetype
;
2888 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node
)) = sizetype
;
2890 error_mark_node
= make_node (ERROR_MARK
);
2891 TREE_TYPE (error_mark_node
) = error_mark_node
;
2893 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
2894 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2895 short_integer_type_node
));
2897 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
2898 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2899 short_unsigned_type_node
));
2901 /* Define both `signed char' and `unsigned char'. */
2902 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
2903 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2904 signed_char_type_node
));
2906 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
2907 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2908 unsigned_char_type_node
));
2910 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
2911 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2913 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
2914 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2916 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
2917 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2919 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
2920 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2922 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
2923 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2925 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
2926 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2928 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
2929 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2931 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
2932 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2934 float_type_node
= make_node (REAL_TYPE
);
2935 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
2936 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2938 layout_type (float_type_node
);
2940 double_type_node
= make_node (REAL_TYPE
);
2941 if (flag_short_double
)
2942 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
2944 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
2945 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2947 layout_type (double_type_node
);
2949 long_double_type_node
= make_node (REAL_TYPE
);
2950 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
2951 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2952 long_double_type_node
));
2953 layout_type (long_double_type_node
);
2955 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
2956 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2957 complex_integer_type_node
));
2958 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
2959 layout_type (complex_integer_type_node
);
2961 complex_float_type_node
= make_node (COMPLEX_TYPE
);
2962 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2963 complex_float_type_node
));
2964 TREE_TYPE (complex_float_type_node
) = float_type_node
;
2965 layout_type (complex_float_type_node
);
2967 complex_double_type_node
= make_node (COMPLEX_TYPE
);
2968 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2969 complex_double_type_node
));
2970 TREE_TYPE (complex_double_type_node
) = double_type_node
;
2971 layout_type (complex_double_type_node
);
2973 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
2974 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2975 complex_long_double_type_node
));
2976 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
2977 layout_type (complex_long_double_type_node
);
2980 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
2981 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
2982 signed_wchar_type_node
= signed_type (wchar_type_node
);
2983 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
2985 integer_zero_node
= build_int_2 (0, 0);
2986 TREE_TYPE (integer_zero_node
) = integer_type_node
;
2987 integer_one_node
= build_int_2 (1, 0);
2988 TREE_TYPE (integer_one_node
) = integer_type_node
;
2990 boolean_type_node
= integer_type_node
;
2991 boolean_true_node
= integer_one_node
;
2992 boolean_false_node
= integer_zero_node
;
2994 size_zero_node
= build_int_2 (0, 0);
2995 TREE_TYPE (size_zero_node
) = sizetype
;
2996 size_one_node
= build_int_2 (1, 0);
2997 TREE_TYPE (size_one_node
) = sizetype
;
2999 void_type_node
= make_node (VOID_TYPE
);
3000 pushdecl (build_decl (TYPE_DECL
,
3001 ridpointers
[(int) RID_VOID
], void_type_node
));
3002 layout_type (void_type_node
); /* Uses integer_zero_node */
3003 /* We are not going to have real types in C with less than byte alignment,
3004 so we might as well not have any types that claim to have it. */
3005 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
3007 null_pointer_node
= build_int_2 (0, 0);
3008 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
3009 layout_type (TREE_TYPE (null_pointer_node
));
3011 string_type_node
= build_pointer_type (char_type_node
);
3012 const_string_type_node
3013 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3015 /* Make a type to be the domain of a few array types
3016 whose domains don't really matter.
3017 200 is small enough that it always fits in size_t
3018 and large enough that it can hold most function names for the
3019 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3020 array_domain_type
= build_index_type (build_int_2 (200, 0));
3022 /* make a type for arrays of characters.
3023 With luck nothing will ever really depend on the length of this
3025 char_array_type_node
3026 = build_array_type (char_type_node
, array_domain_type
);
3027 /* Likewise for arrays of ints. */
3029 = build_array_type (integer_type_node
, array_domain_type
);
3030 /* This is for wide string constants. */
3031 wchar_array_type_node
3032 = build_array_type (wchar_type_node
, array_domain_type
);
3034 default_function_type
3035 = build_function_type (integer_type_node
, NULL_TREE
);
3037 ptr_type_node
= build_pointer_type (void_type_node
);
3039 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
3041 endlink
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3044 = build_function_type (void_type_node
, NULL_TREE
);
3047 = build_function_type (float_type_node
,
3048 tree_cons (NULL_TREE
, float_type_node
, endlink
));
3051 = build_function_type (double_type_node
,
3052 tree_cons (NULL_TREE
, double_type_node
, endlink
));
3054 ldouble_ftype_ldouble
3055 = build_function_type (long_double_type_node
,
3056 tree_cons (NULL_TREE
, long_double_type_node
,
3059 double_ftype_double_double
3060 = build_function_type (double_type_node
,
3061 tree_cons (NULL_TREE
, double_type_node
,
3062 tree_cons (NULL_TREE
,
3063 double_type_node
, endlink
)));
3066 = build_function_type (integer_type_node
,
3067 tree_cons (NULL_TREE
, integer_type_node
, endlink
));
3070 = build_function_type (long_integer_type_node
,
3071 tree_cons (NULL_TREE
,
3072 long_integer_type_node
, endlink
));
3074 void_ftype_ptr_ptr_int
3075 = build_function_type (void_type_node
,
3076 tree_cons (NULL_TREE
, ptr_type_node
,
3077 tree_cons (NULL_TREE
, ptr_type_node
,
3078 tree_cons (NULL_TREE
,
3082 int_ftype_cptr_cptr_sizet
3083 = build_function_type (integer_type_node
,
3084 tree_cons (NULL_TREE
, const_ptr_type_node
,
3085 tree_cons (NULL_TREE
, const_ptr_type_node
,
3086 tree_cons (NULL_TREE
,
3090 void_ftype_ptr_int_int
3091 = build_function_type (void_type_node
,
3092 tree_cons (NULL_TREE
, ptr_type_node
,
3093 tree_cons (NULL_TREE
, integer_type_node
,
3094 tree_cons (NULL_TREE
,
3098 string_ftype_ptr_ptr
/* strcpy prototype */
3099 = build_function_type (string_type_node
,
3100 tree_cons (NULL_TREE
, string_type_node
,
3101 tree_cons (NULL_TREE
,
3102 const_string_type_node
,
3105 int_ftype_string_string
/* strcmp prototype */
3106 = build_function_type (integer_type_node
,
3107 tree_cons (NULL_TREE
, const_string_type_node
,
3108 tree_cons (NULL_TREE
,
3109 const_string_type_node
,
3112 strlen_ftype
/* strlen prototype */
3113 = build_function_type (flag_traditional
? integer_type_node
: sizetype
,
3114 tree_cons (NULL_TREE
, const_string_type_node
,
3117 traditional_ptr_type_node
3118 = (flag_traditional
? string_type_node
: ptr_type_node
);
3120 memcpy_ftype
/* memcpy prototype */
3121 = build_function_type (traditional_ptr_type_node
,
3122 tree_cons (NULL_TREE
, ptr_type_node
,
3123 tree_cons (NULL_TREE
, const_ptr_type_node
,
3124 tree_cons (NULL_TREE
,
3128 builtin_function ("__builtin_constant_p", default_function_type
,
3129 BUILT_IN_CONSTANT_P
, NULL_PTR
);
3131 builtin_function ("__builtin_return_address",
3132 build_function_type (ptr_type_node
,
3133 tree_cons (NULL_TREE
,
3136 BUILT_IN_RETURN_ADDRESS
, NULL_PTR
);
3138 builtin_function ("__builtin_frame_address",
3139 build_function_type (ptr_type_node
,
3140 tree_cons (NULL_TREE
,
3143 BUILT_IN_FRAME_ADDRESS
, NULL_PTR
);
3145 builtin_function ("__builtin_alloca",
3146 build_function_type (ptr_type_node
,
3147 tree_cons (NULL_TREE
,
3150 BUILT_IN_ALLOCA
, "alloca");
3151 builtin_function ("__builtin_ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3152 /* Define alloca, ffs as builtins.
3153 Declare _exit just to mark it as volatile. */
3154 if (! flag_no_builtin
&& !flag_no_nonansi_builtin
)
3156 temp
= builtin_function ("alloca",
3157 build_function_type (ptr_type_node
,
3158 tree_cons (NULL_TREE
,
3161 BUILT_IN_ALLOCA
, NULL_PTR
);
3162 /* Suppress error if redefined as a non-function. */
3163 DECL_BUILT_IN_NONANSI (temp
) = 1;
3164 temp
= builtin_function ("ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
3165 /* Suppress error if redefined as a non-function. */
3166 DECL_BUILT_IN_NONANSI (temp
) = 1;
3167 temp
= builtin_function ("_exit", void_ftype_any
, NOT_BUILT_IN
,
3169 TREE_THIS_VOLATILE (temp
) = 1;
3170 TREE_SIDE_EFFECTS (temp
) = 1;
3171 /* Suppress error if redefined as a non-function. */
3172 DECL_BUILT_IN_NONANSI (temp
) = 1;
3175 builtin_function ("__builtin_abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3176 builtin_function ("__builtin_fabsf", float_ftype_float
, BUILT_IN_FABS
,
3178 builtin_function ("__builtin_fabs", double_ftype_double
, BUILT_IN_FABS
,
3180 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3182 builtin_function ("__builtin_labs", long_ftype_long
, BUILT_IN_LABS
,
3184 builtin_function ("__builtin_saveregs",
3185 build_function_type (ptr_type_node
, NULL_TREE
),
3186 BUILT_IN_SAVEREGS
, NULL_PTR
);
3187 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3189 builtin_function ("__builtin_varargs",
3190 build_function_type (ptr_type_node
,
3191 tree_cons (NULL_TREE
,
3194 BUILT_IN_VARARGS
, NULL_PTR
);
3196 builtin_function ("__builtin_classify_type", default_function_type
,
3197 BUILT_IN_CLASSIFY_TYPE
, NULL_PTR
);
3198 builtin_function ("__builtin_next_arg",
3199 build_function_type (ptr_type_node
, NULL_TREE
),
3200 BUILT_IN_NEXT_ARG
, NULL_PTR
);
3201 builtin_function ("__builtin_args_info",
3202 build_function_type (integer_type_node
,
3203 tree_cons (NULL_TREE
,
3206 BUILT_IN_ARGS_INFO
, NULL_PTR
);
3208 /* Untyped call and return. */
3209 builtin_function ("__builtin_apply_args",
3210 build_function_type (ptr_type_node
, NULL_TREE
),
3211 BUILT_IN_APPLY_ARGS
, NULL_PTR
);
3213 temp
= tree_cons (NULL_TREE
,
3214 build_pointer_type (build_function_type (void_type_node
,
3216 tree_cons (NULL_TREE
,
3218 tree_cons (NULL_TREE
,
3221 builtin_function ("__builtin_apply",
3222 build_function_type (ptr_type_node
, temp
),
3223 BUILT_IN_APPLY
, NULL_PTR
);
3224 builtin_function ("__builtin_return",
3225 build_function_type (void_type_node
,
3226 tree_cons (NULL_TREE
,
3229 BUILT_IN_RETURN
, NULL_PTR
);
3231 /* Currently under experimentation. */
3232 builtin_function ("__builtin_memcpy", memcpy_ftype
,
3233 BUILT_IN_MEMCPY
, "memcpy");
3234 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet
,
3235 BUILT_IN_MEMCMP
, "memcmp");
3236 builtin_function ("__builtin_strcmp", int_ftype_string_string
,
3237 BUILT_IN_STRCMP
, "strcmp");
3238 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr
,
3239 BUILT_IN_STRCPY
, "strcpy");
3240 builtin_function ("__builtin_strlen", strlen_ftype
,
3241 BUILT_IN_STRLEN
, "strlen");
3242 builtin_function ("__builtin_sqrtf", float_ftype_float
,
3243 BUILT_IN_FSQRT
, "sqrtf");
3244 builtin_function ("__builtin_fsqrt", double_ftype_double
,
3245 BUILT_IN_FSQRT
, "sqrt");
3246 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble
,
3247 BUILT_IN_FSQRT
, "sqrtl");
3248 builtin_function ("__builtin_sinf", float_ftype_float
,
3249 BUILT_IN_SIN
, "sinf");
3250 builtin_function ("__builtin_sin", double_ftype_double
,
3251 BUILT_IN_SIN
, "sin");
3252 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble
,
3253 BUILT_IN_SIN
, "sinl");
3254 builtin_function ("__builtin_cosf", float_ftype_float
,
3255 BUILT_IN_COS
, "cosf");
3256 builtin_function ("__builtin_cos", double_ftype_double
,
3257 BUILT_IN_COS
, "cos");
3258 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble
,
3259 BUILT_IN_COS
, "cosl");
3260 builtin_function ("__builtin_setjmp",
3261 build_function_type (integer_type_node
,
3262 tree_cons (NULL_TREE
,
3263 ptr_type_node
, endlink
)),
3264 BUILT_IN_SETJMP
, NULL_PTR
);
3265 builtin_function ("__builtin_longjmp",
3268 tree_cons (NULL
, ptr_type_node
,
3269 tree_cons (NULL_TREE
,
3272 BUILT_IN_LONGJMP
, NULL_PTR
);
3274 /* In an ANSI C program, it is okay to supply built-in meanings
3275 for these functions, since applications cannot validly use them
3276 with any other meaning.
3277 However, honor the -fno-builtin option. */
3278 if (!flag_no_builtin
)
3280 builtin_function ("abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3281 builtin_function ("fabsf", float_ftype_float
, BUILT_IN_FABS
, NULL_PTR
);
3282 builtin_function ("fabs", double_ftype_double
, BUILT_IN_FABS
, NULL_PTR
);
3283 builtin_function ("fabsl", ldouble_ftype_ldouble
, BUILT_IN_FABS
,
3285 builtin_function ("labs", long_ftype_long
, BUILT_IN_LABS
, NULL_PTR
);
3286 builtin_function ("memcpy", memcpy_ftype
, BUILT_IN_MEMCPY
, NULL_PTR
);
3287 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet
, BUILT_IN_MEMCMP
,
3289 builtin_function ("strcmp", int_ftype_string_string
, BUILT_IN_STRCMP
,
3291 builtin_function ("strcpy", string_ftype_ptr_ptr
, BUILT_IN_STRCPY
,
3293 builtin_function ("strlen", strlen_ftype
, BUILT_IN_STRLEN
, NULL_PTR
);
3294 builtin_function ("sqrtf", float_ftype_float
, BUILT_IN_FSQRT
, NULL_PTR
);
3295 builtin_function ("sqrt", double_ftype_double
, BUILT_IN_FSQRT
, NULL_PTR
);
3296 builtin_function ("sqrtl", ldouble_ftype_ldouble
, BUILT_IN_FSQRT
,
3298 builtin_function ("sinf", float_ftype_float
, BUILT_IN_SIN
, NULL_PTR
);
3299 builtin_function ("sin", double_ftype_double
, BUILT_IN_SIN
, NULL_PTR
);
3300 builtin_function ("sinl", ldouble_ftype_ldouble
, BUILT_IN_SIN
, NULL_PTR
);
3301 builtin_function ("cosf", float_ftype_float
, BUILT_IN_COS
, NULL_PTR
);
3302 builtin_function ("cos", double_ftype_double
, BUILT_IN_COS
, NULL_PTR
);
3303 builtin_function ("cosl", ldouble_ftype_ldouble
, BUILT_IN_COS
, NULL_PTR
);
3305 /* Declare these functions volatile
3306 to avoid spurious "control drops through" warnings. */
3307 /* Don't specify the argument types, to avoid errors
3308 from certain code which isn't valid in ANSI but which exists. */
3309 temp
= builtin_function ("abort", void_ftype_any
, NOT_BUILT_IN
,
3311 TREE_THIS_VOLATILE (temp
) = 1;
3312 TREE_SIDE_EFFECTS (temp
) = 1;
3313 temp
= builtin_function ("exit", void_ftype_any
, NOT_BUILT_IN
, NULL_PTR
);
3314 TREE_THIS_VOLATILE (temp
) = 1;
3315 TREE_SIDE_EFFECTS (temp
) = 1;
3319 /* Support for these has not been written in either expand_builtin
3320 or build_function_call. */
3321 builtin_function ("__builtin_div", default_ftype
, BUILT_IN_DIV
, NULL_PTR
);
3322 builtin_function ("__builtin_ldiv", default_ftype
, BUILT_IN_LDIV
, NULL_PTR
);
3323 builtin_function ("__builtin_ffloor", double_ftype_double
, BUILT_IN_FFLOOR
,
3325 builtin_function ("__builtin_fceil", double_ftype_double
, BUILT_IN_FCEIL
,
3327 builtin_function ("__builtin_fmod", double_ftype_double_double
,
3328 BUILT_IN_FMOD
, NULL_PTR
);
3329 builtin_function ("__builtin_frem", double_ftype_double_double
,
3330 BUILT_IN_FREM
, NULL_PTR
);
3331 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int
,
3332 BUILT_IN_MEMSET
, NULL_PTR
);
3333 builtin_function ("__builtin_getexp", double_ftype_double
, BUILT_IN_GETEXP
,
3335 builtin_function ("__builtin_getman", double_ftype_double
, BUILT_IN_GETMAN
,
3339 pedantic_lvalues
= pedantic
;
3341 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3342 declare_function_name ();
3344 start_identifier_warnings ();
3346 /* Prepare to check format strings against argument lists. */
3347 init_function_format_info ();
3351 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3354 /* Return a definition for a builtin function named NAME and whose data type
3355 is TYPE. TYPE should be a function type with argument types.
3356 FUNCTION_CODE tells later passes how to compile calls to this function.
3357 See tree.h for its possible values.
3359 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3360 the name to be called if we can't opencode the function. */
3363 builtin_function (name
, type
, function_code
, library_name
)
3366 enum built_in_function function_code
;
3369 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3370 DECL_EXTERNAL (decl
) = 1;
3371 TREE_PUBLIC (decl
) = 1;
3372 /* If -traditional, permit redefining a builtin function any way you like.
3373 (Though really, if the program redefines these functions,
3374 it probably won't work right unless compiled with -fno-builtin.) */
3375 if (flag_traditional
&& name
[0] != '_')
3376 DECL_BUILT_IN_NONANSI (decl
) = 1;
3378 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3379 make_decl_rtl (decl
, NULL_PTR
, 1);
3381 if (function_code
!= NOT_BUILT_IN
)
3383 DECL_BUILT_IN (decl
) = 1;
3384 DECL_FUNCTION_CODE (decl
) = function_code
;
3386 /* Warn if a function in the namespace for users
3387 is used without an occasion to consider it declared. */
3388 if (name
[0] != '_' || name
[1] != '_')
3389 C_DECL_ANTICIPATED (decl
) = 1;
3394 /* Called when a declaration is seen that contains no names to declare.
3395 If its type is a reference to a structure, union or enum inherited
3396 from a containing scope, shadow that tag name for the current scope
3397 with a forward reference.
3398 If its type defines a new named structure or union
3399 or defines an enum, it is valid but we need not do anything here.
3400 Otherwise, it is an error. */
3403 shadow_tag (declspecs
)
3406 shadow_tag_warned (declspecs
, 0);
3410 shadow_tag_warned (declspecs
, warned
)
3413 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3419 pending_invalid_xref
= 0;
3421 for (link
= declspecs
; link
; link
= TREE_CHAIN (link
))
3423 register tree value
= TREE_VALUE (link
);
3424 register enum tree_code code
= TREE_CODE (value
);
3426 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3427 /* Used to test also that TYPE_SIZE (value) != 0.
3428 That caused warning for `struct foo;' at top level in the file. */
3430 register tree name
= lookup_tag_reverse (value
);
3437 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3438 /* Empty unnamed enum OK */
3440 pedwarn ("unnamed struct/union that defines no instances");
3446 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3450 t
= make_node (code
);
3457 if (!warned
&& ! in_system_header
)
3459 warning ("useless keyword or type name in empty declaration");
3466 error ("two types specified in one empty declaration");
3471 pedwarn ("empty declaration");
3475 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3478 groktypename (typename
)
3481 if (TREE_CODE (typename
) != TREE_LIST
)
3483 return grokdeclarator (TREE_VALUE (typename
),
3484 TREE_PURPOSE (typename
),
3488 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3491 groktypename_in_parm_context (typename
)
3494 if (TREE_CODE (typename
) != TREE_LIST
)
3496 return grokdeclarator (TREE_VALUE (typename
),
3497 TREE_PURPOSE (typename
),
3501 /* Decode a declarator in an ordinary declaration or data definition.
3502 This is called as soon as the type information and variable name
3503 have been parsed, before parsing the initializer if any.
3504 Here we create the ..._DECL node, fill in its type,
3505 and put it on the list of decls for the current context.
3506 The ..._DECL node is returned as the value.
3508 Exception: for arrays where the length is not specified,
3509 the type is left null, to be filled in by `finish_decl'.
3511 Function definitions do not come here; they go to start_function
3512 instead. However, external and forward declarations of functions
3513 do go through here. Structure field declarations are done by
3514 grokfield and not through here. */
3516 /* Set this to zero to debug not using the temporary obstack
3517 to parse initializers. */
3518 int debug_temp_inits
= 1;
3521 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3522 tree declarator
, declspecs
;
3524 tree attributes
, prefix_attributes
;
3526 register tree decl
= grokdeclarator (declarator
, declspecs
,
3527 NORMAL
, initialized
);
3529 int init_written
= initialized
;
3531 /* The corresponding pop_obstacks is in finish_decl. */
3532 push_obstacks_nochange ();
3535 /* Is it valid for this decl to have an initializer at all?
3536 If not, set INITIALIZED to zero, which will indirectly
3537 tell `finish_decl' to ignore the initializer once it is parsed. */
3538 switch (TREE_CODE (decl
))
3541 /* typedef foo = bar means give foo the same type as bar.
3542 We haven't parsed bar yet, so `finish_decl' will fix that up.
3543 Any other case of an initialization in a TYPE_DECL is an error. */
3544 if (pedantic
|| list_length (declspecs
) > 1)
3546 error ("typedef `%s' is initialized",
3547 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3553 error ("function `%s' is initialized like a variable",
3554 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3559 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3560 error ("parameter `%s' is initialized",
3561 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3566 /* Don't allow initializations for incomplete types
3567 except for arrays which might be completed by the initialization. */
3568 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3570 /* A complete type is ok if size is fixed. */
3572 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3573 || C_DECL_VARIABLE_SIZE (decl
))
3575 error ("variable-sized object may not be initialized");
3579 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3581 error ("variable `%s' has initializer but incomplete type",
3582 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3585 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3587 error ("elements of array `%s' have incomplete type",
3588 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3595 #if 0 /* Seems redundant with grokdeclarator. */
3596 if (current_binding_level
!= global_binding_level
3597 && DECL_EXTERNAL (decl
)
3598 && TREE_CODE (decl
) != FUNCTION_DECL
)
3599 warning ("declaration of `%s' has `extern' and is initialized",
3600 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3602 DECL_EXTERNAL (decl
) = 0;
3603 if (current_binding_level
== global_binding_level
)
3604 TREE_STATIC (decl
) = 1;
3606 /* Tell `pushdecl' this is an initialized decl
3607 even though we don't yet have the initializer expression.
3608 Also tell `finish_decl' it may store the real initializer. */
3609 DECL_INITIAL (decl
) = error_mark_node
;
3612 /* If this is a function declaration, write a record describing it to the
3613 prototypes file (if requested). */
3615 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3616 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3618 /* ANSI specifies that a tentative definition which is not merged with
3619 a non-tentative definition behaves exactly like a definition with an
3620 initializer equal to zero. (Section 3.7.2)
3621 -fno-common gives strict ANSI behavior. Usually you don't want it.
3622 This matters only for variables with external linkage. */
3623 if (! flag_no_common
)
3624 DECL_COMMON (decl
) = 1;
3626 /* Set attributes here so if duplicate decl, will have proper attributes. */
3627 decl_attributes (decl
, attributes
, prefix_attributes
);
3629 /* Add this decl to the current binding level.
3630 TEM may equal DECL or it may be a previous decl of the same name. */
3631 tem
= pushdecl (decl
);
3633 /* For a local variable, define the RTL now. */
3634 if (current_binding_level
!= global_binding_level
3635 /* But not if this is a duplicate decl
3636 and we preserved the rtl from the previous one
3637 (which may or may not happen). */
3638 && DECL_RTL (tem
) == 0)
3640 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3642 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3643 && DECL_INITIAL (tem
) != 0)
3649 /* When parsing and digesting the initializer,
3650 use temporary storage. Do this even if we will ignore the value. */
3651 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3652 temporary_allocation ();
3658 /* Finish processing of a declaration;
3659 install its initial value.
3660 If the length of an array type is not known before,
3661 it must be determined now, from the initial value, or it is an error. */
3664 finish_decl (decl
, init
, asmspec_tree
)
3668 register tree type
= TREE_TYPE (decl
);
3669 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3670 int temporary
= allocation_temporary_p ();
3673 /* If a name was specified, get the string. */
3675 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3677 /* If `start_decl' didn't like having an initialization, ignore it now. */
3679 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3681 /* Don't crash if parm is initialized. */
3682 if (TREE_CODE (decl
) == PARM_DECL
)
3685 if (ITERATOR_P (decl
))
3688 error_with_decl (decl
, "iterator has no initial value");
3690 init
= save_expr (init
);
3695 if (TREE_CODE (decl
) != TYPE_DECL
)
3696 store_init_value (decl
, init
);
3699 /* typedef foo = bar; store the type of bar as the type of foo. */
3700 TREE_TYPE (decl
) = TREE_TYPE (init
);
3701 DECL_INITIAL (decl
) = init
= 0;
3705 /* Pop back to the obstack that is current for this binding level.
3706 This is because MAXINDEX, rtl, etc. to be made below
3707 must go in the permanent obstack. But don't discard the
3708 temporary data yet. */
3710 #if 0 /* pop_obstacks was near the end; this is what was here. */
3711 if (current_binding_level
== global_binding_level
&& temporary
)
3712 end_temporary_allocation ();
3715 /* Deduce size of array from initialization, if not already known */
3717 if (TREE_CODE (type
) == ARRAY_TYPE
3718 && TYPE_DOMAIN (type
) == 0
3719 && TREE_CODE (decl
) != TYPE_DECL
)
3722 = (TREE_STATIC (decl
)
3723 /* Even if pedantic, an external linkage array
3724 may have incomplete type at first. */
3725 ? pedantic
&& !TREE_PUBLIC (decl
)
3726 : !DECL_EXTERNAL (decl
));
3728 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3730 /* Get the completed type made by complete_array_type. */
3731 type
= TREE_TYPE (decl
);
3734 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3739 error_with_decl (decl
, "array size missing in `%s'");
3740 /* If a `static' var's size isn't known,
3741 make it extern as well as static, so it does not get
3743 If it is not `static', then do not mark extern;
3744 finish_incomplete_decl will give it a default size
3745 and it will get allocated. */
3746 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3747 DECL_EXTERNAL (decl
) = 1;
3750 /* TYPE_MAX_VALUE is always one less than the number of elements
3751 in the array, because we start counting at zero. Therefore,
3752 warn only if the value is less than zero. */
3753 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3754 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3755 error_with_decl (decl
, "zero or negative size array `%s'");
3757 layout_decl (decl
, 0);
3760 if (TREE_CODE (decl
) == VAR_DECL
)
3762 if (DECL_SIZE (decl
) == 0
3763 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3764 layout_decl (decl
, 0);
3766 if (DECL_SIZE (decl
) == 0
3767 && (TREE_STATIC (decl
)
3769 /* A static variable with an incomplete type
3770 is an error if it is initialized.
3771 Also if it is not file scope.
3772 Otherwise, let it through, but if it is not `extern'
3773 then it may cause an error message later. */
3774 /* A duplicate_decls call could have changed an extern
3775 declaration into a file scope one. This can be detected
3776 by TREE_ASM_WRITTEN being set. */
3777 (DECL_INITIAL (decl
) != 0
3778 || DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
))
3780 /* An automatic variable with an incomplete type
3782 !DECL_EXTERNAL (decl
)))
3784 error_with_decl (decl
, "storage size of `%s' isn't known");
3785 TREE_TYPE (decl
) = error_mark_node
;
3788 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3789 && DECL_SIZE (decl
) != 0)
3791 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3792 constant_expression_warning (DECL_SIZE (decl
));
3794 error_with_decl (decl
, "storage size of `%s' isn't constant");
3798 /* If this is a function and an assembler name is specified, it isn't
3799 builtin any more. Also reset DECL_RTL so we can give it its new
3801 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3803 DECL_BUILT_IN (decl
) = 0;
3804 DECL_RTL (decl
) = 0;
3807 /* Output the assembler code and/or RTL code for variables and functions,
3808 unless the type is an undefined structure or union.
3809 If not, it will get done when the type is completed. */
3811 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3813 if ((flag_traditional
|| TREE_PERMANENT (decl
))
3814 && allocation_temporary_p ())
3816 push_obstacks_nochange ();
3817 end_temporary_allocation ();
3818 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3819 maybe_objc_check_decl (decl
);
3820 rest_of_decl_compilation (decl
, asmspec
,
3821 (DECL_CONTEXT (decl
) == 0
3822 || TREE_ASM_WRITTEN (decl
)),
3828 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3829 maybe_objc_check_decl (decl
);
3830 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3833 if (DECL_CONTEXT (decl
) != 0)
3835 /* Recompute the RTL of a local array now
3836 if it used to be an incomplete type. */
3838 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3840 /* If we used it already as memory, it must stay in memory. */
3841 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3842 /* If it's still incomplete now, no init will save it. */
3843 if (DECL_SIZE (decl
) == 0)
3844 DECL_INITIAL (decl
) = 0;
3847 /* Compute and store the initial value. */
3848 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3849 expand_decl_init (decl
);
3853 if (TREE_CODE (decl
) == TYPE_DECL
)
3855 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3856 maybe_objc_check_decl (decl
);
3857 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0,
3861 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3862 /* This test used to include TREE_PERMANENT, however, we have the same
3863 problem with initializers at the function level. Such initializers get
3864 saved until the end of the function on the momentary_obstack. */
3865 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
3867 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3868 space with DECL_ARG_TYPE. */
3869 && TREE_CODE (decl
) != PARM_DECL
)
3871 /* We need to remember that this array HAD an initialization,
3872 but discard the actual temporary nodes,
3873 since we can't have a permanent node keep pointing to them. */
3874 /* We make an exception for inline functions, since it's
3875 normal for a local extern redeclaration of an inline function
3876 to have a copy of the top-level decl's DECL_INLINE. */
3877 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
3879 /* If this is a const variable, then preserve the
3880 initializer instead of discarding it so that we can optimize
3881 references to it. */
3882 /* This test used to include TREE_STATIC, but this won't be set
3883 for function level initializers. */
3884 if (TREE_READONLY (decl
) || ITERATOR_P (decl
))
3886 preserve_initializer ();
3887 /* Hack? Set the permanent bit for something that is permanent,
3888 but not on the permanent obstack, so as to convince
3889 output_constant_def to make its rtl on the permanent
3891 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
3893 /* The initializer and DECL must have the same (or equivalent
3894 types), but if the initializer is a STRING_CST, its type
3895 might not be on the right obstack, so copy the type
3897 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3900 DECL_INITIAL (decl
) = error_mark_node
;
3904 /* If requested, warn about definitions of large data objects. */
3906 if (warn_larger_than
3907 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
3908 && !DECL_EXTERNAL (decl
))
3910 register tree decl_size
= DECL_SIZE (decl
);
3912 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
3914 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
3916 if (units
> larger_than_size
)
3917 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
3922 /* Resume permanent allocation, if not within a function. */
3923 /* The corresponding push_obstacks_nochange is in start_decl,
3924 and in push_parm_decl and in grokfield. */
3928 /* If we have gone back from temporary to permanent allocation,
3929 actually free the temporary space that we no longer need. */
3930 if (temporary
&& !allocation_temporary_p ())
3931 permanent_allocation (0);
3933 /* At the end of a declaration, throw away any variable type sizes
3934 of types defined inside that declaration. There is no use
3935 computing them in the following function definition. */
3936 if (current_binding_level
== global_binding_level
)
3937 get_pending_sizes ();
3940 /* If DECL has a cleanup, build and return that cleanup here.
3941 This is a callback called by expand_expr. */
3944 maybe_build_cleanup (decl
)
3947 /* There are no cleanups in C. */
3951 /* Given a parsed parameter declaration,
3952 decode it into a PARM_DECL and push that on the current binding level.
3953 Also, for the sake of forward parm decls,
3954 record the given order of parms in `parm_order'. */
3957 push_parm_decl (parm
)
3961 int old_immediate_size_expand
= immediate_size_expand
;
3962 /* Don't try computing parm sizes now -- wait till fn is called. */
3963 immediate_size_expand
= 0;
3965 /* The corresponding pop_obstacks is in finish_decl. */
3966 push_obstacks_nochange ();
3968 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3969 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3970 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3971 TREE_PURPOSE (TREE_VALUE (parm
)));
3974 if (DECL_NAME (decl
))
3977 olddecl
= lookup_name (DECL_NAME (decl
));
3978 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3979 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3983 decl
= pushdecl (decl
);
3985 immediate_size_expand
= old_immediate_size_expand
;
3987 current_binding_level
->parm_order
3988 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3990 /* Add this decl to the current binding level. */
3991 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3994 /* Clear the given order of parms in `parm_order'.
3995 Used at start of parm list,
3996 and also at semicolon terminating forward decls. */
4001 current_binding_level
->parm_order
= NULL_TREE
;
4004 /* Make TYPE a complete type based on INITIAL_VALUE.
4005 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4006 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4009 complete_array_type (type
, initial_value
, do_default
)
4014 register tree maxindex
= NULL_TREE
;
4019 /* Note MAXINDEX is really the maximum index,
4020 one less than the size. */
4021 if (TREE_CODE (initial_value
) == STRING_CST
)
4024 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
4025 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
4028 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
4030 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
4031 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
4032 for (; elts
; elts
= TREE_CHAIN (elts
))
4034 if (TREE_PURPOSE (elts
))
4035 maxindex
= TREE_PURPOSE (elts
);
4037 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
4039 maxindex
= copy_node (maxindex
);
4043 /* Make an error message unless that happened already. */
4044 if (initial_value
!= error_mark_node
)
4047 /* Prevent further error messages. */
4048 maxindex
= build_int_2 (0, 0);
4055 maxindex
= build_int_2 (0, 0);
4061 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
4062 if (!TREE_TYPE (maxindex
))
4063 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
4064 #if 0 /* I took out this change
4065 together with the change in build_array_type. --rms */
4066 change_main_variant (type
,
4067 build_array_type (TREE_TYPE (type
),
4068 TYPE_DOMAIN (type
)));
4072 /* Lay out the type now that we can get the real answer. */
4079 /* Given declspecs and a declarator,
4080 determine the name and type of the object declared
4081 and construct a ..._DECL node for it.
4082 (In one case we can return a ..._TYPE node instead.
4083 For invalid input we sometimes return 0.)
4085 DECLSPECS is a chain of tree_list nodes whose value fields
4086 are the storage classes and type specifiers.
4088 DECL_CONTEXT says which syntactic context this declaration is in:
4089 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4090 FUNCDEF for a function definition. Like NORMAL but a few different
4091 error messages in each case. Return value may be zero meaning
4092 this definition is too screwy to try to parse.
4093 PARM for a parameter declaration (either within a function prototype
4094 or before a function body). Make a PARM_DECL, or return void_type_node.
4095 TYPENAME if for a typename (in a cast or sizeof).
4096 Don't make a DECL node; just return the ..._TYPE node.
4097 FIELD for a struct or union field; make a FIELD_DECL.
4098 BITFIELD for a field with specified width.
4099 INITIALIZED is 1 if the decl has an initializer.
4101 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4102 It may also be so in the PARM case, for a prototype where the
4103 argument type is specified but not the name.
4105 This function is where the complicated C meanings of `static'
4106 and `extern' are interpreted. */
4109 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4112 enum decl_context decl_context
;
4117 tree type
= NULL_TREE
;
4122 int explicit_int
= 0;
4123 int explicit_char
= 0;
4124 int defaulted_int
= 0;
4125 tree typedef_decl
= 0;
4127 tree typedef_type
= 0;
4128 int funcdef_flag
= 0;
4129 enum tree_code innermost_code
= ERROR_MARK
;
4131 int size_varies
= 0;
4132 tree decl_machine_attr
= NULL_TREE
;
4134 if (decl_context
== BITFIELD
)
4135 bitfield
= 1, decl_context
= FIELD
;
4137 if (decl_context
== FUNCDEF
)
4138 funcdef_flag
= 1, decl_context
= NORMAL
;
4140 push_obstacks_nochange ();
4142 if (flag_traditional
&& allocation_temporary_p ())
4143 end_temporary_allocation ();
4145 /* Look inside a declarator for the name being declared
4146 and get it as a string, for an error message. */
4148 register tree decl
= declarator
;
4152 switch (TREE_CODE (decl
))
4157 innermost_code
= TREE_CODE (decl
);
4158 decl
= TREE_OPERAND (decl
, 0);
4161 case IDENTIFIER_NODE
:
4162 name
= IDENTIFIER_POINTER (decl
);
4173 /* A function definition's declarator must have the form of
4174 a function declarator. */
4176 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4179 /* Anything declared one level down from the top level
4180 must be one of the parameters of a function
4181 (because the body is at least two levels down). */
4183 /* If this looks like a function definition, make it one,
4184 even if it occurs where parms are expected.
4185 Then store_parm_decls will reject it and not use it as a parm. */
4186 if (decl_context
== NORMAL
&& !funcdef_flag
4187 && current_binding_level
->parm_flag
)
4188 decl_context
= PARM
;
4190 /* Look through the decl specs and record which ones appear.
4191 Some typespecs are defined as built-in typenames.
4192 Others, the ones that are modifiers of other types,
4193 are represented by bits in SPECBITS: set the bits for
4194 the modifiers that appear. Storage class keywords are also in SPECBITS.
4196 If there is a typedef name or a type, store the type in TYPE.
4197 This includes builtin typedefs such as `int'.
4199 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4200 and did not come from a user typedef.
4202 Set LONGLONG if `long' is mentioned twice. */
4204 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4207 register tree id
= TREE_VALUE (spec
);
4209 if (id
== ridpointers
[(int) RID_INT
])
4211 if (id
== ridpointers
[(int) RID_CHAR
])
4214 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4215 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
4217 if (ridpointers
[i
] == id
)
4219 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
4222 error ("`long long long' is too long for GCC");
4225 if (pedantic
&& ! in_system_header
)
4226 pedwarn ("ANSI C does not support `long long'");
4230 else if (specbits
& (1 << i
))
4231 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4237 error ("two or more data types in declaration of `%s'", name
);
4238 /* Actual typedefs come to us as TYPE_DECL nodes. */
4239 else if (TREE_CODE (id
) == TYPE_DECL
)
4241 type
= TREE_TYPE (id
);
4242 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4245 /* Built-in types come as identifiers. */
4246 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4248 register tree t
= lookup_name (id
);
4249 if (TREE_TYPE (t
) == error_mark_node
)
4251 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4252 error ("`%s' fails to be a typedef or built in type",
4253 IDENTIFIER_POINTER (id
));
4256 type
= TREE_TYPE (t
);
4260 else if (TREE_CODE (id
) != ERROR_MARK
)
4266 typedef_type
= type
;
4268 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4270 /* No type at all: default to `int', and set DEFAULTED_INT
4271 because it was not a user-defined typedef. */
4275 if (funcdef_flag
&& warn_return_type
4276 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4277 | (1 << (int) RID_SIGNED
) | (1 << (int) RID_UNSIGNED
))))
4278 warn_about_return_type
= 1;
4280 type
= integer_type_node
;
4283 /* Now process the modifiers that were specified
4284 and check for invalid combinations. */
4286 /* Long double is a special combination. */
4288 if ((specbits
& 1 << (int) RID_LONG
)
4289 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4291 specbits
&= ~ (1 << (int) RID_LONG
);
4292 type
= long_double_type_node
;
4295 /* Check all other uses of type modifiers. */
4297 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4298 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4302 if (TREE_CODE (type
) != INTEGER_TYPE
)
4303 error ("long, short, signed or unsigned invalid for `%s'", name
);
4304 else if ((specbits
& 1 << (int) RID_LONG
)
4305 && (specbits
& 1 << (int) RID_SHORT
))
4306 error ("long and short specified together for `%s'", name
);
4307 else if (((specbits
& 1 << (int) RID_LONG
)
4308 || (specbits
& 1 << (int) RID_SHORT
))
4310 error ("long or short specified with char for `%s'", name
);
4311 else if (((specbits
& 1 << (int) RID_LONG
)
4312 || (specbits
& 1 << (int) RID_SHORT
))
4313 && TREE_CODE (type
) == REAL_TYPE
)
4314 error ("long or short specified with floating type for `%s'", name
);
4315 else if ((specbits
& 1 << (int) RID_SIGNED
)
4316 && (specbits
& 1 << (int) RID_UNSIGNED
))
4317 error ("signed and unsigned given together for `%s'", name
);
4321 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4323 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4325 if (flag_pedantic_errors
)
4330 /* Discard the type modifiers if they are invalid. */
4333 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4334 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4339 if ((specbits
& (1 << (int) RID_COMPLEX
))
4340 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4342 error ("complex invalid for `%s'", name
);
4343 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4346 /* Decide whether an integer type is signed or not.
4347 Optionally treat bitfields as signed by default. */
4348 if (specbits
& 1 << (int) RID_UNSIGNED
4349 /* Traditionally, all bitfields are unsigned. */
4350 || (bitfield
&& flag_traditional
4351 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4352 || (bitfield
&& ! flag_signed_bitfields
4353 && (explicit_int
|| defaulted_int
|| explicit_char
4354 /* A typedef for plain `int' without `signed'
4355 can be controlled just like plain `int'. */
4356 || ! (typedef_decl
!= 0
4357 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4358 && TREE_CODE (type
) != ENUMERAL_TYPE
4359 && !(specbits
& 1 << (int) RID_SIGNED
)))
4362 type
= long_long_unsigned_type_node
;
4363 else if (specbits
& 1 << (int) RID_LONG
)
4364 type
= long_unsigned_type_node
;
4365 else if (specbits
& 1 << (int) RID_SHORT
)
4366 type
= short_unsigned_type_node
;
4367 else if (type
== char_type_node
)
4368 type
= unsigned_char_type_node
;
4369 else if (typedef_decl
)
4370 type
= unsigned_type (type
);
4372 type
= unsigned_type_node
;
4374 else if ((specbits
& 1 << (int) RID_SIGNED
)
4375 && type
== char_type_node
)
4376 type
= signed_char_type_node
;
4378 type
= long_long_integer_type_node
;
4379 else if (specbits
& 1 << (int) RID_LONG
)
4380 type
= long_integer_type_node
;
4381 else if (specbits
& 1 << (int) RID_SHORT
)
4382 type
= short_integer_type_node
;
4384 if (specbits
& 1 << (int) RID_COMPLEX
)
4386 /* If we just have "complex", it is equivalent to
4387 "complex double", but if any modifiers at all are specified it is
4388 the complex form of TYPE. E.g, "complex short" is
4389 "complex short int". */
4391 if (defaulted_int
&& ! longlong
4392 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4393 | (1 << (int) RID_SIGNED
)
4394 | (1 << (int) RID_UNSIGNED
))))
4395 type
= complex_double_type_node
;
4396 else if (type
== integer_type_node
)
4397 type
= complex_integer_type_node
;
4398 else if (type
== float_type_node
)
4399 type
= complex_float_type_node
;
4400 else if (type
== double_type_node
)
4401 type
= complex_double_type_node
;
4402 else if (type
== long_double_type_node
)
4403 type
= complex_long_double_type_node
;
4405 type
= build_complex_type (type
);
4408 /* Set CONSTP if this declaration is `const', whether by
4409 explicit specification or via a typedef.
4410 Likewise for VOLATILEP. */
4412 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4413 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4414 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4416 pedwarn ("duplicate `const'");
4418 pedwarn ("duplicate `volatile'");
4419 if (! flag_gen_aux_info
&& (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)))
4420 type
= TYPE_MAIN_VARIANT (type
);
4422 /* Warn if two storage classes are given. Default to `auto'. */
4427 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4428 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4429 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4430 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4431 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4432 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4434 /* Warn about storage classes that are invalid for certain
4435 kinds of declarations (parameters, typenames, etc.). */
4438 error ("multiple storage classes in declaration of `%s'", name
);
4439 else if (funcdef_flag
4441 & ((1 << (int) RID_REGISTER
)
4442 | (1 << (int) RID_AUTO
)
4443 | (1 << (int) RID_TYPEDEF
))))
4445 if (specbits
& 1 << (int) RID_AUTO
4446 && (pedantic
|| current_binding_level
== global_binding_level
))
4447 pedwarn ("function definition declared `auto'");
4448 if (specbits
& 1 << (int) RID_REGISTER
)
4449 error ("function definition declared `register'");
4450 if (specbits
& 1 << (int) RID_TYPEDEF
)
4451 error ("function definition declared `typedef'");
4452 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4453 | (1 << (int) RID_AUTO
));
4455 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4457 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4461 error ((decl_context
== FIELD
4462 ? "storage class specified for structure field `%s'"
4463 : (decl_context
== PARM
4464 ? "storage class specified for parameter `%s'"
4465 : "storage class specified for typename")),
4467 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4468 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4469 | (1 << (int) RID_EXTERN
));
4472 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4474 /* `extern' with initialization is invalid if not at top level. */
4475 if (current_binding_level
== global_binding_level
)
4476 warning ("`%s' initialized and declared `extern'", name
);
4478 error ("`%s' has both `extern' and initializer", name
);
4480 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4481 && current_binding_level
!= global_binding_level
)
4482 error ("nested function `%s' declared `extern'", name
);
4483 else if (current_binding_level
== global_binding_level
4484 && specbits
& (1 << (int) RID_AUTO
))
4485 error ("top-level declaration of `%s' specifies `auto'", name
);
4486 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4487 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4489 error ("iterator `%s' has derived type", name
);
4490 type
= error_mark_node
;
4492 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4493 && TREE_CODE (type
) != INTEGER_TYPE
)
4495 error ("iterator `%s' has noninteger type", name
);
4496 type
= error_mark_node
;
4500 /* Now figure out the structure of the declarator proper.
4501 Descend through it, creating more complex types, until we reach
4502 the declared identifier (or NULL_TREE, in an absolute declarator). */
4504 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4506 if (type
== error_mark_node
)
4508 declarator
= TREE_OPERAND (declarator
, 0);
4512 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4513 an INDIRECT_REF (for *...),
4514 a CALL_EXPR (for ...(...)),
4515 an identifier (for the name being declared)
4516 or a null pointer (for the place in an absolute declarator
4517 where the name was omitted).
4518 For the last two cases, we have just exited the loop.
4520 At this point, TYPE is the type of elements of an array,
4521 or for a function to return, or for a pointer to point to.
4522 After this sequence of ifs, TYPE is the type of the
4523 array or function or pointer, and DECLARATOR has had its
4524 outermost layer removed. */
4526 if (TREE_CODE (declarator
) == ARRAY_REF
)
4528 register tree itype
= NULL_TREE
;
4529 register tree size
= TREE_OPERAND (declarator
, 1);
4530 /* An uninitialized decl with `extern' is a reference. */
4531 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4532 /* The index is a signed object `sizetype' bits wide. */
4533 tree index_type
= signed_type (sizetype
);
4535 declarator
= TREE_OPERAND (declarator
, 0);
4537 /* Check for some types that there cannot be arrays of. */
4539 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4541 error ("declaration of `%s' as array of voids", name
);
4542 type
= error_mark_node
;
4545 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4547 error ("declaration of `%s' as array of functions", name
);
4548 type
= error_mark_node
;
4551 if (size
== error_mark_node
)
4552 type
= error_mark_node
;
4554 if (type
== error_mark_node
)
4557 /* If this is a block level extern, it must live past the end
4558 of the function so that we can check it against other extern
4559 declarations (IDENTIFIER_LIMBO_VALUE). */
4560 if (extern_ref
&& allocation_temporary_p ())
4561 end_temporary_allocation ();
4563 /* If size was specified, set ITYPE to a range-type for that size.
4564 Otherwise, ITYPE remains null. finish_decl may figure it out
4565 from an initial value. */
4569 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4570 STRIP_TYPE_NOPS (size
);
4572 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4573 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4575 error ("size of array `%s' has non-integer type", name
);
4576 size
= integer_one_node
;
4579 if (pedantic
&& integer_zerop (size
))
4580 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4582 if (TREE_CODE (size
) == INTEGER_CST
)
4584 constant_expression_warning (size
);
4585 if (tree_int_cst_sgn (size
) < 0)
4587 error ("size of array `%s' is negative", name
);
4588 size
= integer_one_node
;
4593 /* Make sure the array size remains visibly nonconstant
4594 even if it is (eg) a const variable with known value. */
4599 if (TREE_CONSTANT (size
))
4600 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4602 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4606 /* Convert size to index_type, so that if it is a variable
4607 the computations will be done in the proper mode. */
4608 itype
= fold (build (MINUS_EXPR
, index_type
,
4609 convert (index_type
, size
),
4610 convert (index_type
, size_one_node
)));
4613 itype
= variable_size (itype
);
4614 itype
= build_index_type (itype
);
4617 #if 0 /* This had bad results for pointers to arrays, as in
4618 union incomplete (*foo)[4]; */
4619 /* Complain about arrays of incomplete types, except in typedefs. */
4621 if (TYPE_SIZE (type
) == 0
4622 /* Avoid multiple warnings for nested array types. */
4623 && TREE_CODE (type
) != ARRAY_TYPE
4624 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4625 && !C_TYPE_BEING_DEFINED (type
))
4626 warning ("array type has incomplete element type");
4629 #if 0 /* We shouldn't have a function type here at all!
4630 Functions aren't allowed as array elements. */
4631 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4632 && (constp
|| volatilep
))
4633 pedwarn ("ANSI C forbids const or volatile function types");
4636 /* Build the array type itself, then merge any constancy or
4637 volatility into the target type. We must do it in this order
4638 to ensure that the TYPE_MAIN_VARIANT field of the array type
4639 is set correctly. */
4641 type
= build_array_type (type
, itype
);
4642 if (constp
|| volatilep
)
4643 type
= c_build_type_variant (type
, constp
, volatilep
);
4645 #if 0 /* don't clear these; leave them set so that the array type
4646 or the variable is itself const or volatile. */
4652 C_TYPE_VARIABLE_SIZE (type
) = 1;
4654 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4656 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4657 || current_binding_level
== global_binding_level
);
4660 /* Declaring a function type.
4661 Make sure we have a valid type for the function to return. */
4662 if (type
== error_mark_node
)
4667 /* Warn about some types functions can't return. */
4669 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4671 error ("`%s' declared as function returning a function", name
);
4672 type
= integer_type_node
;
4674 if (TREE_CODE (type
) == ARRAY_TYPE
)
4676 error ("`%s' declared as function returning an array", name
);
4677 type
= integer_type_node
;
4680 #ifndef TRADITIONAL_RETURN_FLOAT
4681 /* Traditionally, declaring return type float means double. */
4683 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4684 type
= double_type_node
;
4685 #endif /* TRADITIONAL_RETURN_FLOAT */
4687 /* If this is a block level extern, it must live past the end
4688 of the function so that we can check it against other extern
4689 declarations (IDENTIFIER_LIMBO_VALUE). */
4690 if (extern_ref
&& allocation_temporary_p ())
4691 end_temporary_allocation ();
4693 /* Construct the function type and go to the next
4694 inner layer of declarator. */
4696 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4698 /* Say it's a definition
4699 only for the CALL_EXPR
4700 closest to the identifier. */
4701 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4702 #if 0 /* This seems to be false. We turn off temporary allocation
4703 above in this function if -traditional.
4704 And this code caused inconsistent results with prototypes:
4705 callers would ignore them, and pass arguments wrong. */
4707 /* Omit the arg types if -traditional, since the arg types
4708 and the list links might not be permanent. */
4709 type
= build_function_type (type
,
4711 ? NULL_TREE
: arg_types
);
4713 /* ANSI seems to say that `const int foo ();'
4714 does not make the function foo const. */
4715 if (constp
|| volatilep
)
4716 type
= c_build_type_variant (type
, constp
, volatilep
);
4720 type
= build_function_type (type
, arg_types
);
4721 declarator
= TREE_OPERAND (declarator
, 0);
4723 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4724 the formal parameter list of this FUNCTION_TYPE to point to
4725 the FUNCTION_TYPE node itself. */
4730 for (link
= current_function_parm_tags
;
4732 link
= TREE_CHAIN (link
))
4733 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4736 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4738 /* Merge any constancy or volatility into the target type
4741 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4742 && (constp
|| volatilep
))
4743 pedwarn ("ANSI C forbids const or volatile function types");
4744 if (constp
|| volatilep
)
4745 type
= c_build_type_variant (type
, constp
, volatilep
);
4750 type
= build_pointer_type (type
);
4752 /* Process a list of type modifier keywords
4753 (such as const or volatile) that were given inside the `*'. */
4755 if (TREE_TYPE (declarator
))
4757 register tree typemodlist
;
4759 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4760 typemodlist
= TREE_CHAIN (typemodlist
))
4762 if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_CONST
])
4764 else if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_VOLATILE
])
4769 error ("invalid type modifier within pointer declarator");
4773 pedwarn ("duplicate `const'");
4775 pedwarn ("duplicate `volatile'");
4778 declarator
= TREE_OPERAND (declarator
, 0);
4785 /* Now TYPE has the actual type. */
4787 /* If this is declaring a typedef name, return a TYPE_DECL. */
4789 if (specbits
& (1 << (int) RID_TYPEDEF
))
4792 /* Note that the grammar rejects storage classes
4793 in typenames, fields or parameters */
4794 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4795 && (constp
|| volatilep
))
4796 pedwarn ("ANSI C forbids const or volatile function types");
4797 if (constp
|| volatilep
)
4798 type
= c_build_type_variant (type
, constp
, volatilep
);
4800 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4801 if ((specbits
& (1 << (int) RID_SIGNED
))
4802 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4803 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4807 /* Detect the case of an array type of unspecified size
4808 which came, as such, direct from a typedef name.
4809 We must copy the type, so that each identifier gets
4810 a distinct type, so that each identifier's size can be
4811 controlled separately by its own initializer. */
4813 if (type
!= 0 && typedef_type
!= 0
4814 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4815 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4817 type
= build_array_type (TREE_TYPE (type
), 0);
4819 C_TYPE_VARIABLE_SIZE (type
) = 1;
4822 /* If this is a type name (such as, in a cast or sizeof),
4823 compute the type and return it now. */
4825 if (decl_context
== TYPENAME
)
4827 /* Note that the grammar rejects storage classes
4828 in typenames, fields or parameters */
4829 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4830 && (constp
|| volatilep
))
4831 pedwarn ("ANSI C forbids const or volatile function types");
4832 if (constp
|| volatilep
)
4833 type
= c_build_type_variant (type
, constp
, volatilep
);
4838 /* Aside from typedefs and type names (handle above),
4839 `void' at top level (not within pointer)
4840 is allowed only in public variables.
4841 We don't complain about parms either, but that is because
4842 a better error message can be made later. */
4844 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4845 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4846 && ((specbits
& (1 << (int) RID_EXTERN
))
4847 || (current_binding_level
== global_binding_level
4849 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4851 error ("variable or field `%s' declared void", name
);
4852 type
= integer_type_node
;
4855 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4856 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4861 if (decl_context
== PARM
)
4863 tree type_as_written
= type
;
4866 /* A parameter declared as an array of T is really a pointer to T.
4867 One declared as a function is really a pointer to a function. */
4869 if (TREE_CODE (type
) == ARRAY_TYPE
)
4871 /* Transfer const-ness of array into that of type pointed to. */
4872 type
= TREE_TYPE (type
);
4873 if (constp
|| volatilep
)
4874 type
= c_build_type_variant (type
, constp
, volatilep
);
4875 type
= build_pointer_type (type
);
4876 volatilep
= constp
= 0;
4879 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4881 if (pedantic
&& (constp
|| volatilep
))
4882 pedwarn ("ANSI C forbids const or volatile function types");
4883 if (constp
|| volatilep
)
4884 type
= c_build_type_variant (type
, constp
, volatilep
);
4885 type
= build_pointer_type (type
);
4886 volatilep
= constp
= 0;
4889 decl
= build_decl (PARM_DECL
, declarator
, type
);
4891 C_DECL_VARIABLE_SIZE (decl
) = 1;
4893 /* Compute the type actually passed in the parmlist,
4894 for the case where there is no prototype.
4895 (For example, shorts and chars are passed as ints.)
4896 When there is a prototype, this is overridden later. */
4898 DECL_ARG_TYPE (decl
) = type
;
4899 main_type
= (type
== error_mark_node
4901 : TYPE_MAIN_VARIANT (type
));
4902 if (main_type
== float_type_node
)
4903 DECL_ARG_TYPE (decl
) = double_type_node
;
4904 /* Don't use TYPE_PRECISION to decide whether to promote,
4905 because we should convert short if it's the same size as int,
4906 but we should not convert long if it's the same size as int. */
4907 else if (TREE_CODE (main_type
) != ERROR_MARK
4908 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
4910 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
4911 && TREE_UNSIGNED (type
))
4912 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
4914 DECL_ARG_TYPE (decl
) = integer_type_node
;
4917 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4919 else if (decl_context
== FIELD
)
4921 /* Structure field. It may not be a function. */
4923 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4925 error ("field `%s' declared as a function", name
);
4926 type
= build_pointer_type (type
);
4928 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
4930 error ("field `%s' has incomplete type", name
);
4931 type
= error_mark_node
;
4933 /* Move type qualifiers down to element of an array. */
4934 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4936 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4938 TYPE_DOMAIN (type
));
4939 #if 0 /* Leave the field const or volatile as well. */
4940 constp
= volatilep
= 0;
4943 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4945 C_DECL_VARIABLE_SIZE (decl
) = 1;
4947 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4949 /* Every function declaration is "external"
4950 except for those which are inside a function body
4951 in which `auto' is used.
4952 That is a case not specified by ANSI C,
4953 and we use it for forward declarations for nested functions. */
4954 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4955 || current_binding_level
== global_binding_level
);
4957 if (specbits
& (1 << (int) RID_AUTO
)
4958 && (pedantic
|| current_binding_level
== global_binding_level
))
4959 pedwarn ("invalid storage class for function `%s'", name
);
4960 if (specbits
& (1 << (int) RID_REGISTER
))
4961 error ("invalid storage class for function `%s'", name
);
4962 /* Function declaration not at top level.
4963 Storage classes other than `extern' are not allowed
4964 and `extern' makes no difference. */
4965 if (current_binding_level
!= global_binding_level
4966 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4968 pedwarn ("invalid storage class for function `%s'", name
);
4970 /* If this is a block level extern, it must live past the end
4971 of the function so that we can check it against other
4972 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4973 if (extern_ref
&& allocation_temporary_p ())
4974 end_temporary_allocation ();
4976 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4977 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4979 if (pedantic
&& (constp
|| volatilep
)
4980 && ! DECL_IN_SYSTEM_HEADER (decl
))
4981 pedwarn ("ANSI C forbids const or volatile functions");
4984 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
4985 warning ("`noreturn' function returns non-void value");
4988 DECL_EXTERNAL (decl
) = 1;
4989 /* Record absence of global scope for `static' or `auto'. */
4991 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4993 /* Record presence of `inline', if it is reasonable. */
4996 tree last
= tree_last (TYPE_ARG_TYPES (type
));
4998 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4999 warning ("cannot inline function `main'");
5000 else if (last
&& (TYPE_MAIN_VARIANT (TREE_VALUE (last
))
5002 warning ("inline declaration ignored for function with `...'");
5004 /* Assume that otherwise the function can be inlined. */
5005 DECL_INLINE (decl
) = 1;
5007 if (specbits
& (1 << (int) RID_EXTERN
))
5008 current_extern_inline
= 1;
5013 /* It's a variable. */
5014 /* An uninitialized decl with `extern' is a reference. */
5015 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
5017 /* Move type qualifiers down to element of an array. */
5018 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
5020 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
5022 TYPE_DOMAIN (type
));
5023 #if 0 /* Leave the variable const or volatile as well. */
5024 constp
= volatilep
= 0;
5028 /* If this is a block level extern, it must live past the end
5029 of the function so that we can check it against other
5030 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5031 if (extern_ref
&& allocation_temporary_p ())
5032 end_temporary_allocation ();
5034 decl
= build_decl (VAR_DECL
, declarator
, type
);
5036 C_DECL_VARIABLE_SIZE (decl
) = 1;
5039 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
5041 DECL_EXTERNAL (decl
) = extern_ref
;
5042 /* At top level, the presence of a `static' or `register' storage
5043 class specifier, or the absence of all storage class specifiers
5044 makes this declaration a definition (perhaps tentative). Also,
5045 the absence of both `static' and `register' makes it public. */
5046 if (current_binding_level
== global_binding_level
)
5050 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
5051 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
5053 /* Not at top level, only `static' makes a static definition. */
5056 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
5057 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
5060 if (specbits
& 1 << (int) RID_ITERATOR
)
5061 ITERATOR_P (decl
) = 1;
5064 /* Record `register' declaration for warnings on &
5065 and in case doing stupid register allocation. */
5067 if (specbits
& (1 << (int) RID_REGISTER
))
5068 DECL_REGISTER (decl
) = 1;
5070 /* Record constancy and volatility. */
5073 TREE_READONLY (decl
) = 1;
5076 TREE_SIDE_EFFECTS (decl
) = 1;
5077 TREE_THIS_VOLATILE (decl
) = 1;
5079 /* If a type has volatile components, it should be stored in memory.
5080 Otherwise, the fact that those components are volatile
5081 will be ignored, and would even crash the compiler. */
5082 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5083 mark_addressable (decl
);
5091 /* Decode the parameter-list info for a function type or function definition.
5092 The argument is the value returned by `get_parm_info' (or made in parse.y
5093 if there is an identifier list instead of a parameter decl list).
5094 These two functions are separate because when a function returns
5095 or receives functions then each is called multiple times but the order
5096 of calls is different. The last call to `grokparms' is always the one
5097 that contains the formal parameter names of a function definition.
5099 Store in `last_function_parms' a chain of the decls of parms.
5100 Also store in `last_function_parm_tags' a chain of the struct, union,
5101 and enum tags declared among the parms.
5103 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5105 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5106 a mere declaration. A nonempty identifier-list gets an error message
5107 when FUNCDEF_FLAG is zero. */
5110 grokparms (parms_info
, funcdef_flag
)
5114 tree first_parm
= TREE_CHAIN (parms_info
);
5116 last_function_parms
= TREE_PURPOSE (parms_info
);
5117 last_function_parm_tags
= TREE_VALUE (parms_info
);
5119 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5120 && !in_system_header
)
5121 warning ("function declaration isn't a prototype");
5124 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5127 pedwarn ("parameter names (without types) in function declaration");
5129 last_function_parms
= first_parm
;
5136 /* We no longer test FUNCDEF_FLAG.
5137 If the arg types are incomplete in a declaration,
5138 they must include undefined tags.
5139 These tags can never be defined in the scope of the declaration,
5140 so the types can never be completed,
5141 and no call can be compiled successfully. */
5143 /* In a fcn definition, arg types must be complete. */
5146 for (parm
= last_function_parms
, typelt
= first_parm
;
5148 parm
= TREE_CHAIN (parm
))
5149 /* Skip over any enumeration constants declared here. */
5150 if (TREE_CODE (parm
) == PARM_DECL
)
5152 /* Barf if the parameter itself has an incomplete type. */
5153 tree type
= TREE_VALUE (typelt
);
5154 if (TYPE_SIZE (type
) == 0)
5156 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5157 error ("parameter `%s' has incomplete type",
5158 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5160 warning ("parameter has incomplete type");
5163 TREE_VALUE (typelt
) = error_mark_node
;
5164 TREE_TYPE (parm
) = error_mark_node
;
5167 #if 0 /* This has been replaced by parm_tags_warning
5168 which uses a more accurate criterion for what to warn about. */
5171 /* Now warn if is a pointer to an incomplete type. */
5172 while (TREE_CODE (type
) == POINTER_TYPE
5173 || TREE_CODE (type
) == REFERENCE_TYPE
)
5174 type
= TREE_TYPE (type
);
5175 type
= TYPE_MAIN_VARIANT (type
);
5176 if (TYPE_SIZE (type
) == 0)
5178 if (DECL_NAME (parm
) != 0)
5179 warning ("parameter `%s' points to incomplete type",
5180 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5182 warning ("parameter points to incomplete type");
5186 typelt
= TREE_CHAIN (typelt
);
5189 /* Allocate the list of types the way we allocate a type. */
5190 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
5192 /* Construct a copy of the list of types
5193 on the saveable obstack. */
5195 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
5196 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
5198 return nreverse (result
);
5201 /* The list we have is permanent already. */
5207 /* Return a tree_list node with info on a parameter list just parsed.
5208 The TREE_PURPOSE is a chain of decls of those parms.
5209 The TREE_VALUE is a list of structure, union and enum tags defined.
5210 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5211 This tree_list node is later fed to `grokparms'.
5213 VOID_AT_END nonzero means append `void' to the end of the type-list.
5214 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5217 get_parm_info (void_at_end
)
5220 register tree decl
, t
;
5221 register tree types
= 0;
5223 tree tags
= gettags ();
5224 tree parms
= getdecls ();
5226 tree order
= current_binding_level
->parm_order
;
5228 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5229 if (void_at_end
&& parms
!= 0
5230 && TREE_CHAIN (parms
) == 0
5231 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
5232 && DECL_NAME (parms
) == 0)
5235 storedecls (NULL_TREE
);
5236 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
5237 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5240 /* Extract enumerator values and other non-parms declared with the parms.
5241 Likewise any forward parm decls that didn't have real parm decls. */
5242 for (decl
= parms
; decl
; )
5244 tree next
= TREE_CHAIN (decl
);
5246 if (TREE_CODE (decl
) != PARM_DECL
)
5248 TREE_CHAIN (decl
) = new_parms
;
5251 else if (TREE_ASM_WRITTEN (decl
))
5253 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
5254 TREE_CHAIN (decl
) = new_parms
;
5260 /* Put the parm decls back in the order they were in in the parm list. */
5261 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5264 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5266 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5269 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5272 /* Store the parmlist in the binding level since the old one
5273 is no longer a valid list. (We have changed the chain pointers.) */
5274 storedecls (new_parms
);
5276 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5277 /* There may also be declarations for enumerators if an enumeration
5278 type is declared among the parms. Ignore them here. */
5279 if (TREE_CODE (decl
) == PARM_DECL
)
5281 /* Since there is a prototype,
5282 args are passed in their declared types. */
5283 tree type
= TREE_TYPE (decl
);
5284 DECL_ARG_TYPE (decl
) = type
;
5285 #ifdef PROMOTE_PROTOTYPES
5286 if ((TREE_CODE (type
) == INTEGER_TYPE
5287 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5288 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5289 DECL_ARG_TYPE (decl
) = integer_type_node
;
5292 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5293 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5294 && DECL_NAME (decl
) == 0)
5296 error ("`void' in parameter list must be the entire list");
5302 return saveable_tree_cons (new_parms
, tags
,
5303 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5305 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5308 /* At end of parameter list, warn about any struct, union or enum tags
5309 defined within. Do so because these types cannot ever become complete. */
5312 parmlist_tags_warning ()
5317 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5319 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5320 /* An anonymous union parm type is meaningful as a GNU extension.
5321 So don't warn for that. */
5322 if (code
== UNION_TYPE
&& !pedantic
)
5324 if (TREE_PURPOSE (elt
) != 0)
5325 warning ("`%s %s' declared inside parameter list",
5326 (code
== RECORD_TYPE
? "struct"
5327 : code
== UNION_TYPE
? "union"
5329 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5331 warning ("anonymous %s declared inside parameter list",
5332 (code
== RECORD_TYPE
? "struct"
5333 : code
== UNION_TYPE
? "union"
5338 warning ("its scope is only this definition or declaration,");
5339 warning ("which is probably not what you want.");
5345 /* Get the struct, enum or union (CODE says which) with tag NAME.
5346 Define the tag as a forward-reference if it is not defined. */
5349 xref_tag (code
, name
)
5350 enum tree_code code
;
5353 int temporary
= allocation_temporary_p ();
5355 /* If a cross reference is requested, look up the type
5356 already defined for this tag and return it. */
5358 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5359 /* Even if this is the wrong type of tag, return what we found.
5360 There will be an error message anyway, from pending_xref_error.
5361 If we create an empty xref just for an invalid use of the type,
5362 the main result is to create lots of superfluous error messages. */
5366 push_obstacks_nochange ();
5368 if (current_binding_level
== global_binding_level
&& temporary
)
5369 end_temporary_allocation ();
5371 /* If no such tag is yet defined, create a forward-reference node
5372 and record it as the "definition".
5373 When a real declaration of this type is found,
5374 the forward-reference will be altered into a real type. */
5376 ref
= make_node (code
);
5377 if (code
== ENUMERAL_TYPE
)
5379 /* (In ANSI, Enums can be referred to only if already defined.) */
5381 pedwarn ("ANSI C forbids forward references to `enum' types");
5382 /* Give the type a default layout like unsigned int
5383 to avoid crashing if it does not get defined. */
5384 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5385 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5386 TREE_UNSIGNED (ref
) = 1;
5387 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5388 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5389 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5392 pushtag (name
, ref
);
5399 /* Make sure that the tag NAME is defined *in the current binding level*
5400 at least as a forward reference.
5401 CODE says which kind of tag NAME ought to be.
5403 We also do a push_obstacks_nochange
5404 whose matching pop is in finish_struct. */
5407 start_struct (code
, name
)
5408 enum tree_code code
;
5411 /* If there is already a tag defined at this binding level
5412 (as a forward reference), just return it. */
5414 register tree ref
= 0;
5416 push_obstacks_nochange ();
5417 if (current_binding_level
== global_binding_level
)
5418 end_temporary_allocation ();
5421 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5422 if (ref
&& TREE_CODE (ref
) == code
)
5424 C_TYPE_BEING_DEFINED (ref
) = 1;
5425 if (TYPE_FIELDS (ref
))
5426 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5427 : "redefinition of `struct %s'"),
5428 IDENTIFIER_POINTER (name
));
5433 /* Otherwise create a forward-reference just so the tag is in scope. */
5435 ref
= make_node (code
);
5436 pushtag (name
, ref
);
5437 C_TYPE_BEING_DEFINED (ref
) = 1;
5438 TYPE_PACKED (ref
) = flag_pack_struct
;
5442 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5443 of a structure component, returning a FIELD_DECL node.
5444 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5446 This is done during the parsing of the struct declaration.
5447 The FIELD_DECL nodes are chained together and the lot of them
5448 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5451 grokfield (filename
, line
, declarator
, declspecs
, width
)
5454 tree declarator
, declspecs
, width
;
5458 /* The corresponding pop_obstacks is in finish_decl. */
5459 push_obstacks_nochange ();
5461 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5463 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5464 DECL_INITIAL (value
) = width
;
5466 maybe_objc_check_decl (value
);
5470 /* Function to help qsort sort FIELD_DECLs by name order. */
5473 field_decl_cmp (x
, y
)
5476 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5478 if (DECL_NAME (*x
) == NULL
)
5480 if (DECL_NAME (*y
) == NULL
)
5482 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5487 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5488 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5489 ATTRIBUTES are attributes to be applied to the structure.
5491 We also do a pop_obstacks to match the push in start_struct. */
5494 finish_struct (t
, fieldlist
, attributes
)
5501 int toplevel
= global_binding_level
== current_binding_level
;
5503 /* If this type was previously laid out as a forward reference,
5504 make sure we lay it out again. */
5508 decl_attributes (t
, attributes
, NULL_TREE
);
5510 /* Nameless union parm types are useful as GCC extension. */
5511 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5512 /* Otherwise, warn about any struct or union def. in parmlist. */
5513 if (in_parm_level_p ())
5516 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5517 : "structure defined inside parms"));
5518 else if (! flag_traditional
)
5519 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5520 : "structure defined inside parms"));
5523 old_momentary
= suspend_momentary ();
5525 if (fieldlist
== 0 && pedantic
)
5526 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union has no members"
5527 : "structure has no members"));
5529 /* Install struct as DECL_CONTEXT of each field decl.
5530 Also process specified field sizes.
5531 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5532 The specified size is found in the DECL_INITIAL.
5533 Store 0 there, except for ": 0" fields (so we can find them
5534 and delete them, below). */
5536 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5538 DECL_CONTEXT (x
) = t
;
5539 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5540 DECL_FIELD_SIZE (x
) = 0;
5542 /* If any field is const, the structure type is pseudo-const. */
5543 if (TREE_READONLY (x
))
5544 C_TYPE_FIELDS_READONLY (t
) = 1;
5547 /* A field that is pseudo-const makes the structure likewise. */
5548 tree t1
= TREE_TYPE (x
);
5549 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5550 t1
= TREE_TYPE (t1
);
5551 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5552 && C_TYPE_FIELDS_READONLY (t1
))
5553 C_TYPE_FIELDS_READONLY (t
) = 1;
5556 /* Any field that is volatile means variables of this type must be
5557 treated in some ways as volatile. */
5558 if (TREE_THIS_VOLATILE (x
))
5559 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5561 /* Any field of nominal variable size implies structure is too. */
5562 if (C_DECL_VARIABLE_SIZE (x
))
5563 C_TYPE_VARIABLE_SIZE (t
) = 1;
5565 /* Detect invalid nested redefinition. */
5566 if (TREE_TYPE (x
) == t
)
5567 error ("nested redefinition of `%s'",
5568 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5570 /* Detect invalid bit-field size. */
5571 if (DECL_INITIAL (x
))
5572 STRIP_NOPS (DECL_INITIAL (x
));
5573 if (DECL_INITIAL (x
))
5575 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5576 constant_expression_warning (DECL_INITIAL (x
));
5579 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5580 DECL_INITIAL (x
) = NULL
;
5584 /* Detect invalid bit-field type. */
5585 if (DECL_INITIAL (x
)
5586 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5587 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5589 error_with_decl (x
, "bit-field `%s' has invalid type");
5590 DECL_INITIAL (x
) = NULL
;
5592 if (DECL_INITIAL (x
) && pedantic
5593 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5594 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5595 /* Accept an enum that's equivalent to int or unsigned int. */
5596 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5597 && (TYPE_PRECISION (TREE_TYPE (x
))
5598 == TYPE_PRECISION (integer_type_node
))))
5599 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5601 /* Detect and ignore out of range field width. */
5602 if (DECL_INITIAL (x
))
5604 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5606 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5608 DECL_INITIAL (x
) = NULL
;
5609 error_with_decl (x
, "negative width in bit-field `%s'");
5611 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5612 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5614 DECL_INITIAL (x
) = NULL
;
5615 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5617 else if (width
== 0 && DECL_NAME (x
) != 0)
5619 error_with_decl (x
, "zero width for bit-field `%s'");
5620 DECL_INITIAL (x
) = NULL
;
5624 /* Process valid field width. */
5625 if (DECL_INITIAL (x
))
5627 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5629 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5630 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5631 TREE_UNSIGNED (TREE_TYPE (x
)))
5632 || width
< min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5633 TREE_UNSIGNED (TREE_TYPE (x
)))))
5634 warning_with_decl (x
, "`%s' is narrower than values of its type");
5636 DECL_FIELD_SIZE (x
) = width
;
5637 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5638 DECL_INITIAL (x
) = NULL
;
5642 /* field size 0 => force desired amount of alignment. */
5643 #ifdef EMPTY_FIELD_BOUNDARY
5644 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5646 #ifdef PCC_BITFIELD_TYPE_MATTERS
5647 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5648 TYPE_ALIGN (TREE_TYPE (x
)));
5652 else if (TREE_TYPE (x
) != error_mark_node
)
5654 int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5655 : TYPE_ALIGN (TREE_TYPE (x
)));
5656 /* Non-bit-fields are aligned for their type, except packed
5657 fields which require only BITS_PER_UNIT alignment. */
5658 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5662 /* Now DECL_INITIAL is null on all members. */
5664 /* Delete all duplicate fields from the fieldlist */
5665 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5666 /* Anonymous fields aren't duplicates. */
5667 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5671 register tree y
= fieldlist
;
5675 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5681 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5683 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5684 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5686 else x
= TREE_CHAIN (x
);
5689 /* Now we have the nearly final fieldlist. Record it,
5690 then lay out the structure or union (including the fields). */
5692 TYPE_FIELDS (t
) = fieldlist
;
5696 /* Delete all zero-width bit-fields from the front of the fieldlist */
5698 && DECL_INITIAL (fieldlist
))
5699 fieldlist
= TREE_CHAIN (fieldlist
);
5700 /* Delete all such members from the rest of the fieldlist */
5701 for (x
= fieldlist
; x
;)
5703 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5704 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5705 else x
= TREE_CHAIN (x
);
5708 /* Now we have the truly final field list.
5709 Store it in this type and in the variants. */
5711 TYPE_FIELDS (t
) = fieldlist
;
5713 /* If there are lots of fields, sort so we can look through them fast.
5714 We arbitrarily consider 16 or more elts to be "a lot". */
5718 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5729 len
+= list_length (x
);
5730 /* Use the same allocation policy here that make_node uses, to
5731 ensure that this lives as long as the rest of the struct decl.
5732 All decls in an inline function need to be saved. */
5733 if (allocation_temporary_p ())
5734 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5736 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5738 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5739 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5741 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5743 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5744 field_array
[len
++] = x
;
5746 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5750 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5752 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5753 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5754 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5757 /* If this was supposed to be a transparent union, but we can't
5758 make it one, warn and turn off the flag. */
5759 if (TREE_CODE (t
) == UNION_TYPE
5760 && TYPE_TRANSPARENT_UNION (t
)
5761 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5763 TYPE_TRANSPARENT_UNION (t
) = 0;
5764 warning ("union cannot be made transparent");
5767 /* If this structure or union completes the type of any previous
5768 variable declaration, lay it out and output its rtl. */
5770 if (current_binding_level
->n_incomplete
!= 0)
5773 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5775 if (TREE_TYPE (decl
) == t
5776 && TREE_CODE (decl
) != TYPE_DECL
)
5778 layout_decl (decl
, 0);
5779 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5780 maybe_objc_check_decl (decl
);
5781 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5784 --current_binding_level
->n_incomplete
;
5786 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5787 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5789 tree element
= TREE_TYPE (decl
);
5790 while (TREE_CODE (element
) == ARRAY_TYPE
)
5791 element
= TREE_TYPE (element
);
5793 layout_array_type (TREE_TYPE (decl
));
5798 resume_momentary (old_momentary
);
5800 /* Finish debugging output for this type. */
5801 rest_of_type_compilation (t
, toplevel
);
5803 /* The matching push is in start_struct. */
5809 /* Lay out the type T, and its element type, and so on. */
5812 layout_array_type (t
)
5815 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5816 layout_array_type (TREE_TYPE (t
));
5820 /* Begin compiling the definition of an enumeration type.
5821 NAME is its name (or null if anonymous).
5822 Returns the type object, as yet incomplete.
5823 Also records info about it so that build_enumerator
5824 may be used to declare the individual values as they are read. */
5830 register tree enumtype
= 0;
5832 /* If this is the real definition for a previous forward reference,
5833 fill in the contents in the same object that used to be the
5834 forward reference. */
5837 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5839 /* The corresponding pop_obstacks is in finish_enum. */
5840 push_obstacks_nochange ();
5841 /* If these symbols and types are global, make them permanent. */
5842 if (current_binding_level
== global_binding_level
)
5843 end_temporary_allocation ();
5845 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5847 enumtype
= make_node (ENUMERAL_TYPE
);
5848 pushtag (name
, enumtype
);
5851 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5853 if (TYPE_VALUES (enumtype
) != 0)
5855 /* This enum is a named one that has been declared already. */
5856 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5858 /* Completely replace its old definition.
5859 The old enumerators remain defined, however. */
5860 TYPE_VALUES (enumtype
) = 0;
5863 enum_next_value
= integer_zero_node
;
5866 if (flag_short_enums
)
5867 TYPE_PACKED (enumtype
) = 1;
5872 /* After processing and defining all the values of an enumeration type,
5873 install their decls in the enumeration type and finish it off.
5874 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5875 and ATTRIBUTES are the specified attributes.
5876 Returns ENUMTYPE. */
5879 finish_enum (enumtype
, values
, attributes
)
5884 register tree pair
, tem
;
5885 tree minnode
= 0, maxnode
= 0;
5886 int lowprec
, highprec
, precision
;
5887 int toplevel
= global_binding_level
== current_binding_level
;
5889 if (in_parm_level_p ())
5890 warning ("enum defined inside parms");
5892 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5894 /* Calculate the maximum value of any enumerator in this type. */
5896 if (values
== error_mark_node
)
5897 minnode
= maxnode
= integer_zero_node
;
5899 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5901 tree value
= TREE_VALUE (pair
);
5903 minnode
= maxnode
= TREE_VALUE (pair
);
5906 if (tree_int_cst_lt (maxnode
, value
))
5908 if (tree_int_cst_lt (value
, minnode
))
5913 TYPE_MIN_VALUE (enumtype
) = minnode
;
5914 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5916 /* An enum can have some negative values; then it is signed. */
5917 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
5919 /* Determine the precision this type needs. */
5921 lowprec
= min_precision (minnode
, TREE_UNSIGNED (enumtype
));
5922 highprec
= min_precision (maxnode
, TREE_UNSIGNED (enumtype
));
5923 precision
= MAX (lowprec
, highprec
);
5925 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5927 tree narrowest
= type_for_size (precision
, 1);
5930 warning ("enumeration values exceed range of largest integer");
5931 narrowest
= long_long_integer_type_node
;
5934 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (narrowest
);
5937 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
5939 TYPE_SIZE (enumtype
) = 0;
5940 layout_type (enumtype
);
5942 if (values
!= error_mark_node
)
5944 /* Change the type of the enumerators to be the enum type.
5945 Formerly this was done only for enums that fit in an int,
5946 but the comment said it was done only for enums wider than int.
5947 It seems necessary to do this for wide enums,
5948 and best not to change what's done for ordinary narrower ones. */
5949 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5951 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
5952 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
5953 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
5954 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
5957 /* Replace the decl nodes in VALUES with their names. */
5958 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5959 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
5961 TYPE_VALUES (enumtype
) = values
;
5964 /* Fix up all variant types of this enum type. */
5965 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5967 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5968 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5969 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5970 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5971 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5972 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5973 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5974 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5977 /* Finish debugging output for this type. */
5978 rest_of_type_compilation (enumtype
, toplevel
);
5980 /* This matches a push in start_enum. */
5986 /* Build and install a CONST_DECL for one value of the
5987 current enumeration type (one that was begun with start_enum).
5988 Return a tree-list containing the CONST_DECL and its value.
5989 Assignment of sequential values by default is handled here. */
5992 build_enumerator (name
, value
)
5995 register tree decl
, type
;
5997 /* Validate and default VALUE. */
5999 /* Remove no-op casts from the value. */
6001 STRIP_TYPE_NOPS (value
);
6005 if (TREE_CODE (value
) == INTEGER_CST
)
6007 value
= default_conversion (value
);
6008 constant_expression_warning (value
);
6012 error ("enumerator value for `%s' not integer constant",
6013 IDENTIFIER_POINTER (name
));
6018 /* Default based on previous value. */
6019 /* It should no longer be possible to have NON_LVALUE_EXPR
6023 value
= enum_next_value
;
6025 error ("overflow in enumeration values");
6028 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
6030 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6031 value
= integer_zero_node
;
6034 /* Set basis for default for next value. */
6035 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6036 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6038 /* Now create a declaration for the enum value name. */
6040 type
= TREE_TYPE (value
);
6041 type
= type_for_size (MAX (TYPE_PRECISION (type
),
6042 TYPE_PRECISION (integer_type_node
)),
6044 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
6045 && TREE_UNSIGNED (type
)));
6047 decl
= build_decl (CONST_DECL
, name
, type
);
6048 DECL_INITIAL (decl
) = value
;
6049 TREE_TYPE (value
) = type
;
6052 return saveable_tree_cons (decl
, value
, NULL_TREE
);
6055 /* Create the FUNCTION_DECL for a function definition.
6056 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6057 the declaration; they describe the function's name and the type it returns,
6058 but twisted together in a fashion that parallels the syntax of C.
6060 This function creates a binding context for the function body
6061 as well as setting up the FUNCTION_DECL in current_function_decl.
6063 Returns 1 on success. If the DECLARATOR is not suitable for a function
6064 (it defines a datum instead), we return 0, which tells
6065 yyparse to report a parse error.
6067 NESTED is nonzero for a function nested within another function. */
6070 start_function (declspecs
, declarator
, prefix_attributes
, attributes
, nested
)
6071 tree declarator
, declspecs
, prefix_attributes
, attributes
;
6074 tree decl1
, old_decl
;
6076 int old_immediate_size_expand
= immediate_size_expand
;
6078 current_function_returns_value
= 0; /* Assume, until we see it does. */
6079 current_function_returns_null
= 0;
6080 warn_about_return_type
= 0;
6081 current_extern_inline
= 0;
6082 c_function_varargs
= 0;
6084 shadowed_labels
= 0;
6086 /* Don't expand any sizes in the return type of the function. */
6087 immediate_size_expand
= 0;
6089 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
6091 /* If the declarator is not suitable for a function definition,
6092 cause a syntax error. */
6096 decl_attributes (decl1
, prefix_attributes
, attributes
);
6098 announce_function (decl1
);
6100 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
6102 error ("return-type is an incomplete type");
6103 /* Make it return void instead. */
6105 = build_function_type (void_type_node
,
6106 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6109 if (warn_about_return_type
)
6110 warning ("return-type defaults to `int'");
6112 /* Save the parm names or decls from this function's declarator
6113 where store_parm_decls will find them. */
6114 current_function_parms
= last_function_parms
;
6115 current_function_parm_tags
= last_function_parm_tags
;
6117 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6118 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6119 DECL_INITIAL (decl1
) = error_mark_node
;
6121 /* If this definition isn't a prototype and we had a prototype declaration
6122 before, copy the arg type info from that prototype.
6123 But not if what we had before was a builtin function. */
6124 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6125 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6126 && !DECL_BUILT_IN (old_decl
)
6127 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6128 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6129 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6131 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6132 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6133 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6136 /* If there is no explicit declaration, look for any out-of-scope implicit
6139 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6141 /* Optionally warn of old-fashioned def with no previous prototype. */
6142 if (warn_strict_prototypes
6143 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6144 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
6145 warning ("function declaration isn't a prototype");
6146 /* Optionally warn of any global def with no previous prototype. */
6147 else if (warn_missing_prototypes
6148 && TREE_PUBLIC (decl1
)
6149 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
6150 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6151 warning_with_decl (decl1
, "no previous prototype for `%s'");
6152 /* Optionally warn of any def with no previous prototype
6153 if the function has already been used. */
6154 else if (warn_missing_prototypes
6155 && old_decl
!= 0 && TREE_USED (old_decl
)
6156 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6157 warning_with_decl (decl1
,
6158 "`%s' was used with no prototype before its definition");
6159 /* Optionally warn of any global def with no previous declaration. */
6160 else if (warn_missing_declarations
6161 && TREE_PUBLIC (decl1
)
6163 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6164 warning_with_decl (decl1
, "no previous declaration for `%s'");
6165 /* Optionally warn of any def with no previous declaration
6166 if the function has already been used. */
6167 else if (warn_missing_declarations
6168 && old_decl
!= 0 && TREE_USED (old_decl
)
6169 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6170 warning_with_decl (decl1
,
6171 "`%s' was used with no declaration before its definition");
6173 /* This is a definition, not a reference.
6174 So normally clear DECL_EXTERNAL.
6175 However, `extern inline' acts like a declaration
6176 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6177 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6179 /* This function exists in static storage.
6180 (This does not mean `static' in the C sense!) */
6181 TREE_STATIC (decl1
) = 1;
6183 /* A nested function is not global. */
6184 if (current_function_decl
!= 0)
6185 TREE_PUBLIC (decl1
) = 0;
6187 /* Record the decl so that the function name is defined.
6188 If we already have a decl for this name, and it is a FUNCTION_DECL,
6189 use the old decl. */
6191 current_function_decl
= pushdecl (decl1
);
6194 declare_parm_level (1);
6195 current_binding_level
->subblocks_tag_transparent
= 1;
6197 make_function_rtl (current_function_decl
);
6199 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6200 /* Promote the value to int before returning it. */
6201 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6203 /* It retains unsignedness if traditional
6204 or if not really getting wider. */
6205 if (TREE_UNSIGNED (restype
)
6206 && (flag_traditional
6207 || (TYPE_PRECISION (restype
)
6208 == TYPE_PRECISION (integer_type_node
))))
6209 restype
= unsigned_type_node
;
6211 restype
= integer_type_node
;
6213 DECL_RESULT (current_function_decl
)
6214 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6217 /* Allocate further tree nodes temporarily during compilation
6218 of this function only. */
6219 temporary_allocation ();
6221 /* If this fcn was already referenced via a block-scope `extern' decl
6222 (or an implicit decl), propagate certain information about the usage. */
6223 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6224 TREE_ADDRESSABLE (current_function_decl
) = 1;
6226 immediate_size_expand
= old_immediate_size_expand
;
6231 /* Record that this function is going to be a varargs function.
6232 This is called before store_parm_decls, which is too early
6233 to call mark_varargs directly. */
6238 c_function_varargs
= 1;
6241 /* Store the parameter declarations into the current function declaration.
6242 This is called after parsing the parameter declarations, before
6243 digesting the body of the function.
6245 For an old-style definition, modify the function's type
6246 to specify at least the number of arguments. */
6251 register tree fndecl
= current_function_decl
;
6254 /* This is either a chain of PARM_DECLs (if a prototype was used)
6255 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6256 tree specparms
= current_function_parms
;
6258 /* This is a list of types declared among parms in a prototype. */
6259 tree parmtags
= current_function_parm_tags
;
6261 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6262 register tree parmdecls
= getdecls ();
6264 /* This is a chain of any other decls that came in among the parm
6265 declarations. If a parm is declared with enum {foo, bar} x;
6266 then CONST_DECLs for foo and bar are put here. */
6269 /* Nonzero if this definition is written with a prototype. */
6272 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6274 /* This case is when the function was defined with an ANSI prototype.
6275 The parms already have decls, so we need not do anything here
6276 except record them as in effect
6277 and complain if any redundant old-style parm decls were written. */
6288 error_with_decl (fndecl
,
6289 "parm types given both in parmlist and separately");
6290 /* Get rid of the erroneous decls; don't keep them on
6291 the list of parms, since they might not be PARM_DECLs. */
6292 for (decl
= current_binding_level
->names
;
6293 decl
; decl
= TREE_CHAIN (decl
))
6294 if (DECL_NAME (decl
))
6295 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6296 for (link
= current_binding_level
->shadowed
;
6297 link
; link
= TREE_CHAIN (link
))
6298 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6299 current_binding_level
->names
= 0;
6300 current_binding_level
->shadowed
= 0;
6303 specparms
= nreverse (specparms
);
6304 for (parm
= specparms
; parm
; parm
= next
)
6306 next
= TREE_CHAIN (parm
);
6307 if (TREE_CODE (parm
) == PARM_DECL
)
6309 if (DECL_NAME (parm
) == 0)
6310 error_with_decl (parm
, "parameter name omitted");
6311 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6313 error_with_decl (parm
, "parameter `%s' declared void");
6314 /* Change the type to error_mark_node so this parameter
6315 will be ignored by assign_parms. */
6316 TREE_TYPE (parm
) = error_mark_node
;
6322 /* If we find an enum constant or a type tag,
6323 put it aside for the moment. */
6324 TREE_CHAIN (parm
) = 0;
6325 others
= chainon (others
, parm
);
6329 /* Get the decls in their original chain order
6330 and record in the function. */
6331 DECL_ARGUMENTS (fndecl
) = getdecls ();
6334 /* If this function takes a variable number of arguments,
6335 add a phony parameter to the end of the parm list,
6336 to represent the position of the first unnamed argument. */
6337 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6340 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6341 /* Let's hope the address of the unnamed parm
6342 won't depend on its type. */
6343 TREE_TYPE (dummy
) = integer_type_node
;
6344 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6345 DECL_ARGUMENTS (fndecl
)
6346 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6350 /* Now pushdecl the enum constants. */
6351 for (parm
= others
; parm
; parm
= next
)
6353 next
= TREE_CHAIN (parm
);
6354 if (DECL_NAME (parm
) == 0)
6356 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6358 else if (TREE_CODE (parm
) != PARM_DECL
)
6362 storetags (chainon (parmtags
, gettags ()));
6366 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6367 each with a parm name as the TREE_VALUE.
6369 PARMDECLS is a chain of declarations for parameters.
6370 Warning! It can also contain CONST_DECLs which are not parameters
6371 but are names of enumerators of any enum types
6372 declared among the parameters.
6374 First match each formal parameter name with its declaration.
6375 Associate decls with the names and store the decls
6376 into the TREE_PURPOSE slots. */
6378 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6379 DECL_RESULT (parm
) = 0;
6381 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6383 register tree tail
, found
= NULL
;
6385 if (TREE_VALUE (parm
) == 0)
6387 error_with_decl (fndecl
, "parameter name missing from parameter list");
6388 TREE_PURPOSE (parm
) = 0;
6392 /* See if any of the parmdecls specifies this parm by name.
6393 Ignore any enumerator decls. */
6394 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6395 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6396 && TREE_CODE (tail
) == PARM_DECL
)
6402 /* If declaration already marked, we have a duplicate name.
6403 Complain, and don't use this decl twice. */
6404 if (found
&& DECL_RESULT (found
) != 0)
6406 error_with_decl (found
, "multiple parameters named `%s'");
6410 /* If the declaration says "void", complain and ignore it. */
6411 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6413 error_with_decl (found
, "parameter `%s' declared void");
6414 TREE_TYPE (found
) = integer_type_node
;
6415 DECL_ARG_TYPE (found
) = integer_type_node
;
6416 layout_decl (found
, 0);
6419 /* Traditionally, a parm declared float is actually a double. */
6420 if (found
&& flag_traditional
6421 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6423 TREE_TYPE (found
) = double_type_node
;
6424 DECL_ARG_TYPE (found
) = double_type_node
;
6425 layout_decl (found
, 0);
6428 /* If no declaration found, default to int. */
6431 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6433 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6434 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6435 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6437 warning_with_decl (found
, "type of `%s' defaults to `int'");
6441 TREE_PURPOSE (parm
) = found
;
6443 /* Mark this decl as "already found" -- see test, above.
6444 It is safe to use DECL_RESULT for this
6445 since it is not used in PARM_DECLs or CONST_DECLs. */
6446 DECL_RESULT (found
) = error_mark_node
;
6449 /* Put anything which is on the parmdecls chain and which is
6450 not a PARM_DECL onto the list NONPARMS. (The types of
6451 non-parm things which might appear on the list include
6452 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6453 any actual PARM_DECLs not matched with any names. */
6456 for (parm
= parmdecls
; parm
; )
6458 tree next
= TREE_CHAIN (parm
);
6459 TREE_CHAIN (parm
) = 0;
6461 if (TREE_CODE (parm
) != PARM_DECL
)
6462 nonparms
= chainon (nonparms
, parm
);
6465 /* Complain about args with incomplete types. */
6466 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6468 error_with_decl (parm
, "parameter `%s' has incomplete type");
6469 TREE_TYPE (parm
) = error_mark_node
;
6472 if (DECL_RESULT (parm
) == 0)
6474 error_with_decl (parm
,
6475 "declaration for parameter `%s' but no such parameter");
6476 /* Pretend the parameter was not missing.
6477 This gets us to a standard state and minimizes
6478 further error messages. */
6480 = chainon (specparms
,
6481 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6488 /* Chain the declarations together in the order of the list of names. */
6489 /* Store that chain in the function decl, replacing the list of names. */
6491 DECL_ARGUMENTS (fndecl
) = 0;
6494 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6495 if (TREE_PURPOSE (parm
))
6498 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6500 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6501 last
= TREE_PURPOSE (parm
);
6502 TREE_CHAIN (last
) = 0;
6506 /* If there was a previous prototype,
6507 set the DECL_ARG_TYPE of each argument according to
6508 the type previously specified, and report any mismatches. */
6510 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6513 for (parm
= DECL_ARGUMENTS (fndecl
),
6514 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6515 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6516 != void_type_node
));
6517 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6519 if (parm
== 0 || type
== 0
6520 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6522 error ("number of arguments doesn't match prototype");
6523 error_with_file_and_line (current_function_prototype_file
,
6524 current_function_prototype_line
,
6525 "prototype declaration");
6528 /* Type for passing arg must be consistent
6529 with that declared for the arg. */
6530 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6532 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6533 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6535 /* Adjust argument to match prototype. E.g. a previous
6536 `int foo(float);' prototype causes
6537 `int foo(x) float x; {...}' to be treated like
6538 `int foo(float x) {...}'. This is particularly
6539 useful for argument types like uid_t. */
6540 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6541 #ifdef PROMOTE_PROTOTYPES
6542 if ((TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6543 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6544 && TYPE_PRECISION (TREE_TYPE (parm
))
6545 < TYPE_PRECISION (integer_type_node
))
6546 DECL_ARG_TYPE (parm
) = integer_type_node
;
6550 pedwarn ("promoted argument `%s' doesn't match prototype",
6551 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6552 warning_with_file_and_line
6553 (current_function_prototype_file
,
6554 current_function_prototype_line
,
6555 "prototype declaration");
6558 /* If -traditional, allow `int' argument to match
6559 `unsigned' prototype. */
6560 else if (! (flag_traditional
6561 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6562 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6564 error ("argument `%s' doesn't match prototype",
6565 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6566 error_with_file_and_line (current_function_prototype_file
,
6567 current_function_prototype_line
,
6568 "prototype declaration");
6572 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6575 /* Otherwise, create a prototype that would match. */
6579 tree actual
= 0, last
= 0, type
;
6581 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6583 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6586 TREE_CHAIN (last
) = type
;
6591 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6593 TREE_CHAIN (last
) = type
;
6597 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6598 of the type of this function, but we need to avoid having this
6599 affect the types of other similarly-typed functions, so we must
6600 first force the generation of an identical (but separate) type
6601 node for the relevant function type. The new node we create
6602 will be a variant of the main variant of the original function
6605 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6607 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6610 /* Now store the final chain of decls for the arguments
6611 as the decl-chain of the current lexical scope.
6612 Put the enumerators in as well, at the front so that
6613 DECL_ARGUMENTS is not modified. */
6615 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6618 /* Make sure the binding level for the top of the function body
6619 gets a BLOCK if there are any in the function.
6620 Otherwise, the dbx output is wrong. */
6622 keep_next_if_subblocks
= 1;
6624 /* ??? This might be an improvement,
6625 but needs to be thought about some more. */
6627 keep_next_level_flag
= 1;
6630 /* Write a record describing this function definition to the prototypes
6631 file (if requested). */
6633 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6635 /* Initialize the RTL code for the function. */
6637 init_function_start (fndecl
, input_filename
, lineno
);
6639 /* If this is a varargs function, inform function.c. */
6641 if (c_function_varargs
)
6644 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6646 declare_function_name ();
6648 /* Set up parameters and prepare for return, for the function. */
6650 expand_function_start (fndecl
, 0);
6652 /* If this function is `main', emit a call to `__main'
6653 to run global initializers, etc. */
6654 if (DECL_NAME (fndecl
)
6655 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6656 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6657 expand_main_function ();
6660 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6661 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6662 stands for an ellipsis in the identifier list.
6664 PARMLIST is the data returned by get_parm_info for the
6665 parmlist that follows the semicolon.
6667 We return a value of the same sort that get_parm_info returns,
6668 except that it describes the combination of identifiers and parmlist. */
6671 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6672 tree specparms
, parmlist
;
6675 register tree fndecl
= current_function_decl
;
6678 tree parmdecls
= TREE_PURPOSE (parmlist
);
6680 /* This is a chain of any other decls that came in among the parm
6681 declarations. They were separated already by get_parm_info,
6682 so we just need to keep them separate. */
6683 tree nonparms
= TREE_VALUE (parmlist
);
6687 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6688 DECL_RESULT (parm
) = 0;
6690 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6692 register tree tail
, found
= NULL
;
6694 /* See if any of the parmdecls specifies this parm by name. */
6695 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6696 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6702 /* If declaration already marked, we have a duplicate name.
6703 Complain, and don't use this decl twice. */
6704 if (found
&& DECL_RESULT (found
) != 0)
6706 error_with_decl (found
, "multiple parameters named `%s'");
6710 /* If the declaration says "void", complain and ignore it. */
6711 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6713 error_with_decl (found
, "parameter `%s' declared void");
6714 TREE_TYPE (found
) = integer_type_node
;
6715 DECL_ARG_TYPE (found
) = integer_type_node
;
6716 layout_decl (found
, 0);
6719 /* Traditionally, a parm declared float is actually a double. */
6720 if (found
&& flag_traditional
6721 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6723 TREE_TYPE (found
) = double_type_node
;
6724 DECL_ARG_TYPE (found
) = double_type_node
;
6725 layout_decl (found
, 0);
6728 /* If no declaration found, default to int. */
6731 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6733 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6734 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6735 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6736 error_with_decl (found
, "type of parameter `%s' is not declared");
6740 TREE_PURPOSE (parm
) = found
;
6742 /* Mark this decl as "already found" -- see test, above.
6743 It is safe to use DECL_RESULT for this
6744 since it is not used in PARM_DECLs or CONST_DECLs. */
6745 DECL_RESULT (found
) = error_mark_node
;
6748 /* Complain about any actual PARM_DECLs not matched with any names. */
6750 for (parm
= parmdecls
; parm
; )
6752 tree next
= TREE_CHAIN (parm
);
6753 TREE_CHAIN (parm
) = 0;
6755 /* Complain about args with incomplete types. */
6756 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6758 error_with_decl (parm
, "parameter `%s' has incomplete type");
6759 TREE_TYPE (parm
) = error_mark_node
;
6762 if (DECL_RESULT (parm
) == 0)
6764 error_with_decl (parm
,
6765 "declaration for parameter `%s' but no such parameter");
6766 /* Pretend the parameter was not missing.
6767 This gets us to a standard state and minimizes
6768 further error messages. */
6770 = chainon (specparms
,
6771 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6777 /* Chain the declarations together in the order of the list of names.
6778 At the same time, build up a list of their types, in reverse order. */
6784 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6785 if (TREE_PURPOSE (parm
))
6788 parmdecls
= TREE_PURPOSE (parm
);
6790 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6791 last
= TREE_PURPOSE (parm
);
6792 TREE_CHAIN (last
) = 0;
6794 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6799 return saveable_tree_cons (parmdecls
, nonparms
,
6800 nreverse (saveable_tree_cons (NULL_TREE
,
6804 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
6807 /* Finish up a function declaration and compile that function
6808 all the way to assembler language output. The free the storage
6809 for the function definition.
6811 This is called after parsing the body of the function definition.
6813 NESTED is nonzero if the function being finished is nested in another. */
6816 finish_function (nested
)
6819 register tree fndecl
= current_function_decl
;
6821 /* TREE_READONLY (fndecl) = 1;
6822 This caused &foo to be of type ptr-to-const-function
6823 which then got a warning when stored in a ptr-to-function variable. */
6826 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6828 /* Must mark the RESULT_DECL as being in this function. */
6830 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6832 /* Obey `register' declarations if `setjmp' is called in this fn. */
6833 if (flag_traditional
&& current_function_calls_setjmp
)
6835 setjmp_protect (DECL_INITIAL (fndecl
));
6836 setjmp_protect_args ();
6839 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6841 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6842 != integer_type_node
)
6843 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6846 #ifdef DEFAULT_MAIN_RETURN
6847 /* Make it so that `main' always returns success by default. */
6848 DEFAULT_MAIN_RETURN
;
6853 /* Generate rtl for function exit. */
6854 expand_function_end (input_filename
, lineno
, 0);
6856 /* So we can tell if jump_optimize sets it to 1. */
6859 /* Run the optimizers and output the assembler code for this function. */
6860 rest_of_compilation (fndecl
);
6862 current_function_returns_null
|= can_reach_end
;
6864 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6865 warning ("`noreturn' function does return");
6866 else if (warn_return_type
&& can_reach_end
6867 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
6868 /* If this function returns non-void and control can drop through,
6870 warning ("control reaches end of non-void function");
6871 /* With just -W, complain only if function returns both with
6872 and without a value. */
6873 else if (extra_warnings
6874 && current_function_returns_value
&& current_function_returns_null
)
6875 warning ("this function may return with or without a value");
6877 /* If requested, warn about function definitions where the function will
6878 return a value (usually of some struct or union type) which itself will
6879 take up a lot of stack space. */
6881 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6883 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6887 register tree ret_type_size
= TYPE_SIZE (ret_type
);
6889 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
6892 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
6894 if (units
> larger_than_size
)
6895 warning_with_decl (fndecl
,
6896 "size of return value of `%s' is %u bytes",
6902 /* Free all the tree nodes making up this function. */
6903 /* Switch back to allocating nodes permanently
6904 until we start another function. */
6906 permanent_allocation (1);
6908 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6910 /* Stop pointing to the local nodes about to be freed. */
6911 /* But DECL_INITIAL must remain nonzero so we know this
6912 was an actual function definition. */
6913 /* For a nested function, this is done in pop_c_function_context. */
6914 /* If rest_of_compilation set this to 0, leave it 0. */
6915 if (DECL_INITIAL (fndecl
) != 0)
6916 DECL_INITIAL (fndecl
) = error_mark_node
;
6917 DECL_ARGUMENTS (fndecl
) = 0;
6920 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6922 #ifndef ASM_OUTPUT_CONSTRUCTOR
6923 if (! flag_gnu_linker
)
6924 static_ctors
= perm_tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6927 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
6929 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6931 #ifndef ASM_OUTPUT_DESTRUCTOR
6932 if (! flag_gnu_linker
)
6933 static_dtors
= perm_tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6936 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
6941 /* Let the error reporting routines know that we're outside a
6942 function. For a nested function, this value is used in
6943 pop_c_function_context and then reset via pop_function_context. */
6944 current_function_decl
= NULL
;
6948 /* Save and restore the variables in this file and elsewhere
6949 that keep track of the progress of compilation of the current function.
6950 Used for nested functions. */
6954 struct c_function
*next
;
6956 tree shadowed_labels
;
6959 int warn_about_return_type
;
6961 struct binding_level
*binding_level
;
6964 struct c_function
*c_function_chain
;
6966 /* Save and reinitialize the variables
6967 used during compilation of a C function. */
6970 push_c_function_context ()
6972 struct c_function
*p
6973 = (struct c_function
*) xmalloc (sizeof (struct c_function
));
6976 pedwarn ("ANSI C forbids nested functions");
6978 push_function_context ();
6980 p
->next
= c_function_chain
;
6981 c_function_chain
= p
;
6983 p
->named_labels
= named_labels
;
6984 p
->shadowed_labels
= shadowed_labels
;
6985 p
->returns_value
= current_function_returns_value
;
6986 p
->returns_null
= current_function_returns_null
;
6987 p
->warn_about_return_type
= warn_about_return_type
;
6988 p
->extern_inline
= current_extern_inline
;
6989 p
->binding_level
= current_binding_level
;
6992 /* Restore the variables used during compilation of a C function. */
6995 pop_c_function_context ()
6997 struct c_function
*p
= c_function_chain
;
7000 /* Bring back all the labels that were shadowed. */
7001 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7002 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7003 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7004 = TREE_VALUE (link
);
7006 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
7008 /* Stop pointing to the local nodes about to be freed. */
7009 /* But DECL_INITIAL must remain nonzero so we know this
7010 was an actual function definition. */
7011 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7012 DECL_ARGUMENTS (current_function_decl
) = 0;
7015 pop_function_context ();
7017 c_function_chain
= p
->next
;
7019 named_labels
= p
->named_labels
;
7020 shadowed_labels
= p
->shadowed_labels
;
7021 current_function_returns_value
= p
->returns_value
;
7022 current_function_returns_null
= p
->returns_null
;
7023 warn_about_return_type
= p
->warn_about_return_type
;
7024 current_extern_inline
= p
->extern_inline
;
7025 current_binding_level
= p
->binding_level
;
7030 /* integrate_decl_tree calls this function, but since we don't use the
7031 DECL_LANG_SPECIFIC field, this is a no-op. */
7034 copy_lang_decl (node
)