1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
35 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
37 { NORMAL
, /* Ordinary declaration */
38 FUNCDEF
, /* Function definition */
39 PARM
, /* Declaration of parm before function body */
40 FIELD
, /* Declaration inside struct or union */
41 BITFIELD
, /* Likewise but with specified width */
42 TYPENAME
}; /* Typename (inside cast or sizeof) */
44 #ifndef CHAR_TYPE_SIZE
45 #define CHAR_TYPE_SIZE BITS_PER_UNIT
48 #ifndef SHORT_TYPE_SIZE
49 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
53 #define INT_TYPE_SIZE BITS_PER_WORD
56 #ifndef LONG_TYPE_SIZE
57 #define LONG_TYPE_SIZE BITS_PER_WORD
60 #ifndef LONG_LONG_TYPE_SIZE
61 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
64 #ifndef WCHAR_UNSIGNED
65 #define WCHAR_UNSIGNED 0
68 #ifndef FLOAT_TYPE_SIZE
69 #define FLOAT_TYPE_SIZE BITS_PER_WORD
72 #ifndef DOUBLE_TYPE_SIZE
73 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
76 #ifndef LONG_DOUBLE_TYPE_SIZE
77 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
80 /* We let tm.h override the types used here, to handle trivial differences
81 such as the choice of unsigned int or long unsigned int for size_t.
82 When machines start needing nontrivial differences in the size type,
83 it would be best to do something here to figure out automatically
84 from other information what type to use. */
87 #define SIZE_TYPE "long unsigned int"
91 #define PTRDIFF_TYPE "long int"
95 #define WCHAR_TYPE "int"
98 /* a node which has tree code ERROR_MARK, and whose type is itself.
99 All erroneous expressions are replaced with this node. All functions
100 that accept nodes as arguments should avoid generating error messages
101 if this node is one of the arguments, since it is undesirable to get
102 multiple error messages from one error in the input. */
104 tree error_mark_node
;
106 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
108 tree short_integer_type_node
;
109 tree integer_type_node
;
110 tree long_integer_type_node
;
111 tree long_long_integer_type_node
;
113 tree short_unsigned_type_node
;
114 tree unsigned_type_node
;
115 tree long_unsigned_type_node
;
116 tree long_long_unsigned_type_node
;
118 tree ptrdiff_type_node
;
120 tree unsigned_char_type_node
;
121 tree signed_char_type_node
;
123 tree wchar_type_node
;
124 tree signed_wchar_type_node
;
125 tree unsigned_wchar_type_node
;
127 tree float_type_node
;
128 tree double_type_node
;
129 tree long_double_type_node
;
131 tree complex_integer_type_node
;
132 tree complex_float_type_node
;
133 tree complex_double_type_node
;
134 tree complex_long_double_type_node
;
136 tree intQI_type_node
;
137 tree intHI_type_node
;
138 tree intSI_type_node
;
139 tree intDI_type_node
;
141 tree unsigned_intQI_type_node
;
142 tree unsigned_intHI_type_node
;
143 tree unsigned_intSI_type_node
;
144 tree unsigned_intDI_type_node
;
146 /* a VOID_TYPE node. */
150 /* Nodes for types `void *' and `const void *'. */
152 tree ptr_type_node
, const_ptr_type_node
;
154 /* Nodes for types `char *' and `const char *'. */
156 tree string_type_node
, const_string_type_node
;
158 /* Type `char[SOMENUMBER]'.
159 Used when an array of char is needed and the size is irrelevant. */
161 tree char_array_type_node
;
163 /* Type `int[SOMENUMBER]' or something like it.
164 Used when an array of int needed and the size is irrelevant. */
166 tree int_array_type_node
;
168 /* Type `wchar_t[SOMENUMBER]' or something like it.
169 Used when a wide string literal is created. */
171 tree wchar_array_type_node
;
173 /* type `int ()' -- used for implicit declaration of functions. */
175 tree default_function_type
;
177 /* function types `double (double)' and `double (double, double)', etc. */
179 tree double_ftype_double
, double_ftype_double_double
;
180 tree int_ftype_int
, long_ftype_long
;
182 /* Function type `void (void *, void *, int)' and similar ones */
184 tree void_ftype_ptr_ptr_int
, int_ftype_ptr_ptr_int
, void_ftype_ptr_int_int
;
186 /* Function type `char *(char *, char *)' and similar ones */
187 tree string_ftype_ptr_ptr
, int_ftype_string_string
;
189 /* Function type `int (const void *, const void *, size_t)' */
190 tree int_ftype_cptr_cptr_sizet
;
192 /* Two expressions that are constants with value zero.
193 The first is of type `int', the second of type `void *'. */
195 tree integer_zero_node
;
196 tree null_pointer_node
;
198 /* A node for the integer constant 1. */
200 tree integer_one_node
;
202 /* Nonzero if we have seen an invalid cross reference
203 to a struct, union, or enum, but not yet printed the message. */
205 tree pending_invalid_xref
;
206 /* File and line to appear in the eventual error message. */
207 char *pending_invalid_xref_file
;
208 int pending_invalid_xref_line
;
210 /* While defining an enum type, this is 1 plus the last enumerator
211 constant value. Note that will do not have to save this or `enum_overflow'
212 around nested function definition since such a definition could only
213 occur in an enum value expression and we don't use these variables in
216 static tree enum_next_value
;
218 /* Nonzero means that there was overflow computing enum_next_value. */
220 static int enum_overflow
;
222 /* Parsing a function declarator leaves a list of parameter names
223 or a chain or parameter decls here. */
225 static tree last_function_parms
;
227 /* Parsing a function declarator leaves here a chain of structure
228 and enum types declared in the parmlist. */
230 static tree last_function_parm_tags
;
232 /* After parsing the declarator that starts a function definition,
233 `start_function' puts here the list of parameter names or chain of decls.
234 `store_parm_decls' finds it here. */
236 static tree current_function_parms
;
238 /* Similar, for last_function_parm_tags. */
239 static tree current_function_parm_tags
;
241 /* Similar, for the file and line that the prototype came from if this is
242 an old-style definition. */
243 static char *current_function_prototype_file
;
244 static int current_function_prototype_line
;
246 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
247 that have names. Here so we can clear out their names' definitions
248 at the end of the function. */
250 static tree named_labels
;
252 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
254 static tree shadowed_labels
;
256 /* Nonzero when store_parm_decls is called indicates a varargs function.
257 Value not meaningful after store_parm_decls. */
259 static int c_function_varargs
;
261 /* The FUNCTION_DECL for the function currently being compiled,
262 or 0 if between functions. */
263 tree current_function_decl
;
265 /* Set to 0 at beginning of a function definition, set to 1 if
266 a return statement that specifies a return value is seen. */
268 int current_function_returns_value
;
270 /* Set to 0 at beginning of a function definition, set to 1 if
271 a return statement with no argument is seen. */
273 int current_function_returns_null
;
275 /* Set to nonzero by `grokdeclarator' for a function
276 whose return type is defaulted, if warnings for this are desired. */
278 static int warn_about_return_type
;
280 /* Nonzero when starting a function declared `extern inline'. */
282 static int current_extern_inline
;
284 /* For each binding contour we allocate a binding_level structure
285 * which records the names defined in that contour.
288 * 1) one for each function definition,
289 * where internal declarations of the parameters appear.
290 * 2) one for each compound statement,
291 * to record its declarations.
293 * The current meaning of a name can be found by searching the levels from
294 * the current one out to the global one.
297 /* Note that the information in the `names' component of the global contour
298 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
302 /* A chain of _DECL nodes for all variables, constants, functions,
303 and typedef types. These are in the reverse of the order supplied.
307 /* A list of structure, union and enum definitions,
308 * for looking up tag names.
309 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
310 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
311 * or ENUMERAL_TYPE node.
315 /* For each level, a list of shadowed outer-level local definitions
316 to be restored when this level is popped.
317 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
318 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
321 /* For each level (except not the global one),
322 a chain of BLOCK nodes for all the levels
323 that were entered and exited one level down. */
326 /* The BLOCK node for this level, if one has been preallocated.
327 If 0, the BLOCK is allocated (if needed) when the level is popped. */
330 /* The binding level which this one is contained in (inherits from). */
331 struct binding_level
*level_chain
;
333 /* Nonzero for the level that holds the parameters of a function. */
336 /* Nonzero if this level "doesn't exist" for tags. */
337 char tag_transparent
;
339 /* Nonzero if sublevels of this level "don't exist" for tags.
340 This is set in the parm level of a function definition
341 while reading the function body, so that the outermost block
342 of the function body will be tag-transparent. */
343 char subblocks_tag_transparent
;
345 /* Nonzero means make a BLOCK for this level regardless of all else. */
348 /* Nonzero means make a BLOCK if this level has any subblocks. */
349 char keep_if_subblocks
;
351 /* Number of decls in `names' that have incomplete
352 structure or union types. */
355 /* A list of decls giving the (reversed) specified order of parms,
356 not including any forward-decls in the parmlist.
357 This is so we can put the parms in proper order for assign_parms. */
361 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
363 /* The binding level currently in effect. */
365 static struct binding_level
*current_binding_level
;
367 /* A chain of binding_level structures awaiting reuse. */
369 static struct binding_level
*free_binding_level
;
371 /* The outermost binding level, for names of file scope.
372 This is created when the compiler is started and exists
373 through the entire run. */
375 static struct binding_level
*global_binding_level
;
377 /* Binding level structures are initialized by copying this one. */
379 static struct binding_level clear_binding_level
380 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, 0, 0, 0};
382 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
384 static int keep_next_level_flag
;
386 /* Nonzero means make a BLOCK for the next level pushed
387 if it has subblocks. */
389 static int keep_next_if_subblocks
;
391 /* The chain of outer levels of label scopes.
392 This uses the same data structure used for binding levels,
393 but it works differently: each link in the chain records
394 saved values of named_labels and shadowed_labels for
395 a label binding level outside the current one. */
397 static struct binding_level
*label_level_chain
;
399 /* Forward declarations. */
401 static tree
grokparms (), grokdeclarator ();
403 tree
builtin_function ();
404 void shadow_tag_warned ();
406 static tree
lookup_tag ();
407 static tree
lookup_tag_reverse ();
408 tree
lookup_name_current_level ();
409 static char *redeclaration_error_message ();
410 static void layout_array_type ();
412 /* C-specific option variables. */
414 /* Nonzero means allow type mismatches in conditional expressions;
415 just make their values `void'. */
417 int flag_cond_mismatch
;
419 /* Nonzero means give `double' the same size as `float'. */
421 int flag_short_double
;
423 /* Nonzero means don't recognize the keyword `asm'. */
427 /* Nonzero means don't recognize any builtin functions. */
431 /* Nonzero means don't recognize the non-ANSI builtin functions.
434 int flag_no_nonansi_builtin
;
436 /* Nonzero means do some things the same way PCC does. */
438 int flag_traditional
;
440 /* Nonzero means to allow single precision math even if we're generally
441 being traditional. */
442 int flag_allow_single_precision
= 0;
444 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
446 int flag_signed_bitfields
= 1;
447 int explicit_flag_signed_bitfields
= 0;
449 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
451 int flag_no_ident
= 0;
453 /* Nonzero means warn about implicit declarations. */
457 /* Nonzero means give string constants the type `const char *'
458 to get extra warnings from them. These warnings will be too numerous
459 to be useful, except in thoroughly ANSIfied programs. */
461 int warn_write_strings
;
463 /* Nonzero means warn about pointer casts that can drop a type qualifier
464 from the pointer target type. */
468 /* Warn about traditional constructs whose meanings changed in ANSI C. */
470 int warn_traditional
;
472 /* Nonzero means warn about sizeof(function) or addition/subtraction
473 of function pointers. */
475 int warn_pointer_arith
;
477 /* Nonzero means warn for non-prototype function decls
478 or non-prototyped defs without previous prototype. */
480 int warn_strict_prototypes
;
482 /* Nonzero means warn for any global function def
483 without separate previous prototype decl. */
485 int warn_missing_prototypes
;
487 /* Nonzero means warn for any global function def
488 without separate previous decl. */
490 int warn_missing_declarations
;
492 /* Nonzero means warn about multiple (redundant) decls for the same single
493 variable or function. */
495 int warn_redundant_decls
= 0;
497 /* Nonzero means warn about extern declarations of objects not at
498 file-scope level and about *all* declarations of functions (whether
499 extern or static) not at file-scope level. Note that we exclude
500 implicit function declarations. To get warnings about those, use
503 int warn_nested_externs
= 0;
505 /* Warn about *printf or *scanf format/argument anomalies. */
509 /* Warn about a subscript that has type char. */
511 int warn_char_subscripts
= 0;
513 /* Warn if a type conversion is done that might have confusing results. */
517 /* Warn if adding () is suggested. */
519 int warn_parentheses
;
521 /* Warn if initializer is not completely bracketed. */
523 int warn_missing_braces
;
525 /* Nonzero means `$' can be in an identifier.
526 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
528 #ifndef DOLLARS_IN_IDENTIFIERS
529 #define DOLLARS_IN_IDENTIFIERS 1
531 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
533 /* Decode the string P as a language-specific option for C.
534 Return 1 if it is recognized (and handle it);
535 return 0 if not recognized. */
541 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
543 flag_traditional
= 1;
544 flag_writable_strings
= 1;
545 #if DOLLARS_IN_IDENTIFIERS > 0
546 dollars_in_ident
= 1;
549 else if (!strcmp (p
, "-fallow-single-precision"))
550 flag_allow_single_precision
= 1;
551 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
553 flag_traditional
= 0;
554 flag_writable_strings
= 0;
555 dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
> 1;
557 else if (!strcmp (p
, "-fdollars-in-identifiers"))
559 #if DOLLARS_IN_IDENTIFIERS > 0
560 dollars_in_ident
= 1;
563 else if (!strcmp (p
, "-fnodollars-in-identifiers"))
564 dollars_in_ident
= 0;
565 else if (!strcmp (p
, "-fsigned-char"))
566 flag_signed_char
= 1;
567 else if (!strcmp (p
, "-funsigned-char"))
568 flag_signed_char
= 0;
569 else if (!strcmp (p
, "-fno-signed-char"))
570 flag_signed_char
= 0;
571 else if (!strcmp (p
, "-fno-unsigned-char"))
572 flag_signed_char
= 1;
573 else if (!strcmp (p
, "-fsigned-bitfields")
574 || !strcmp (p
, "-fno-unsigned-bitfields"))
576 flag_signed_bitfields
= 1;
577 explicit_flag_signed_bitfields
= 1;
579 else if (!strcmp (p
, "-funsigned-bitfields")
580 || !strcmp (p
, "-fno-signed-bitfields"))
582 flag_signed_bitfields
= 0;
583 explicit_flag_signed_bitfields
= 1;
585 else if (!strcmp (p
, "-fshort-enums"))
586 flag_short_enums
= 1;
587 else if (!strcmp (p
, "-fno-short-enums"))
588 flag_short_enums
= 0;
589 else if (!strcmp (p
, "-fcond-mismatch"))
590 flag_cond_mismatch
= 1;
591 else if (!strcmp (p
, "-fno-cond-mismatch"))
592 flag_cond_mismatch
= 0;
593 else if (!strcmp (p
, "-fshort-double"))
594 flag_short_double
= 1;
595 else if (!strcmp (p
, "-fno-short-double"))
596 flag_short_double
= 0;
597 else if (!strcmp (p
, "-fasm"))
599 else if (!strcmp (p
, "-fno-asm"))
601 else if (!strcmp (p
, "-fbuiltin"))
603 else if (!strcmp (p
, "-fno-builtin"))
605 else if (!strcmp (p
, "-fno-ident"))
607 else if (!strcmp (p
, "-fident"))
609 else if (!strcmp (p
, "-ansi"))
610 flag_no_asm
= 1, flag_no_nonansi_builtin
= 1, dollars_in_ident
= 0;
611 else if (!strcmp (p
, "-Wimplicit"))
613 else if (!strcmp (p
, "-Wno-implicit"))
615 else if (!strcmp (p
, "-Wwrite-strings"))
616 warn_write_strings
= 1;
617 else if (!strcmp (p
, "-Wno-write-strings"))
618 warn_write_strings
= 0;
619 else if (!strcmp (p
, "-Wcast-qual"))
621 else if (!strcmp (p
, "-Wno-cast-qual"))
623 else if (!strcmp (p
, "-Wpointer-arith"))
624 warn_pointer_arith
= 1;
625 else if (!strcmp (p
, "-Wno-pointer-arith"))
626 warn_pointer_arith
= 0;
627 else if (!strcmp (p
, "-Wstrict-prototypes"))
628 warn_strict_prototypes
= 1;
629 else if (!strcmp (p
, "-Wno-strict-prototypes"))
630 warn_strict_prototypes
= 0;
631 else if (!strcmp (p
, "-Wmissing-prototypes"))
632 warn_missing_prototypes
= 1;
633 else if (!strcmp (p
, "-Wno-missing-prototypes"))
634 warn_missing_prototypes
= 0;
635 else if (!strcmp (p
, "-Wmissing-declarations"))
636 warn_missing_declarations
= 1;
637 else if (!strcmp (p
, "-Wno-missing-declarations"))
638 warn_missing_declarations
= 0;
639 else if (!strcmp (p
, "-Wredundant-decls"))
640 warn_redundant_decls
= 1;
641 else if (!strcmp (p
, "-Wno-redundant-decls"))
642 warn_redundant_decls
= 0;
643 else if (!strcmp (p
, "-Wnested-externs"))
644 warn_nested_externs
= 1;
645 else if (!strcmp (p
, "-Wno-nested-externs"))
646 warn_nested_externs
= 0;
647 else if (!strcmp (p
, "-Wtraditional"))
648 warn_traditional
= 1;
649 else if (!strcmp (p
, "-Wno-traditional"))
650 warn_traditional
= 0;
651 else if (!strcmp (p
, "-Wformat"))
653 else if (!strcmp (p
, "-Wno-format"))
655 else if (!strcmp (p
, "-Wchar-subscripts"))
656 warn_char_subscripts
= 1;
657 else if (!strcmp (p
, "-Wno-char-subscripts"))
658 warn_char_subscripts
= 0;
659 else if (!strcmp (p
, "-Wconversion"))
661 else if (!strcmp (p
, "-Wno-conversion"))
663 else if (!strcmp (p
, "-Wparentheses"))
664 warn_parentheses
= 1;
665 else if (!strcmp (p
, "-Wno-parentheses"))
666 warn_parentheses
= 0;
667 else if (!strcmp (p
, "-Wreturn-type"))
668 warn_return_type
= 1;
669 else if (!strcmp (p
, "-Wno-return-type"))
670 warn_return_type
= 0;
671 else if (!strcmp (p
, "-Wcomment"))
672 ; /* cpp handles this one. */
673 else if (!strcmp (p
, "-Wno-comment"))
674 ; /* cpp handles this one. */
675 else if (!strcmp (p
, "-Wcomments"))
676 ; /* cpp handles this one. */
677 else if (!strcmp (p
, "-Wno-comments"))
678 ; /* cpp handles this one. */
679 else if (!strcmp (p
, "-Wtrigraphs"))
680 ; /* cpp handles this one. */
681 else if (!strcmp (p
, "-Wno-trigraphs"))
682 ; /* cpp handles this one. */
683 else if (!strcmp (p
, "-Wimport"))
684 ; /* cpp handles this one. */
685 else if (!strcmp (p
, "-Wno-import"))
686 ; /* cpp handles this one. */
687 else if (!strcmp (p
, "-Wmissing-braces"))
688 warn_missing_braces
= 1;
689 else if (!strcmp (p
, "-Wno-missing-braces"))
690 warn_missing_braces
= 0;
691 else if (!strcmp (p
, "-Wall"))
694 /* We save the value of warn_uninitialized, since if they put
695 -Wuninitialized on the command line, we need to generate a
696 warning about not using it without also specifying -O. */
697 if (warn_uninitialized
!= 1)
698 warn_uninitialized
= 2;
700 warn_return_type
= 1;
704 warn_char_subscripts
= 1;
705 warn_parentheses
= 1;
706 warn_missing_braces
= 1;
714 /* Hooks for print_node. */
717 print_lang_decl (file
, node
, indent
)
725 print_lang_type (file
, node
, indent
)
733 print_lang_identifier (file
, node
, indent
)
738 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
739 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
740 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
741 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
742 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
743 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
746 /* Hook called at end of compilation to assume 1 elt
747 for a top-level array decl that wasn't complete before. */
750 finish_incomplete_decl (decl
)
753 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_TYPE (decl
) != error_mark_node
)
755 tree type
= TREE_TYPE (decl
);
756 if (TREE_CODE (type
) == ARRAY_TYPE
757 && TYPE_DOMAIN (type
) == 0
758 && TREE_CODE (decl
) != TYPE_DECL
)
760 complete_array_type (type
, NULL_TREE
, 1);
762 layout_decl (decl
, 0);
767 /* Create a new `struct binding_level'. */
770 struct binding_level
*
771 make_binding_level ()
774 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
777 /* Nonzero if we are currently in the global binding level. */
782 return current_binding_level
== global_binding_level
;
788 keep_next_level_flag
= 1;
791 /* Nonzero if the current level needs to have a BLOCK made. */
796 return ((current_binding_level
->keep_if_subblocks
797 && current_binding_level
->blocks
!= 0)
798 || current_binding_level
->keep
799 || current_binding_level
->names
!= 0
800 || (current_binding_level
->tags
!= 0
801 && !current_binding_level
->tag_transparent
));
804 /* Identify this binding level as a level of parameters.
805 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
806 But it turns out there is no way to pass the right value for
807 DEFINITION_FLAG, so we ignore it. */
810 declare_parm_level (definition_flag
)
813 current_binding_level
->parm_flag
= 1;
816 /* Nonzero if currently making parm declarations. */
821 return current_binding_level
->parm_flag
;
824 /* Enter a new binding level.
825 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
826 not for that of tags. */
829 pushlevel (tag_transparent
)
832 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
834 /* If this is the top level of a function,
835 just make sure that NAMED_LABELS is 0. */
837 if (current_binding_level
== global_binding_level
)
842 /* Reuse or create a struct for this binding level. */
844 if (free_binding_level
)
846 newlevel
= free_binding_level
;
847 free_binding_level
= free_binding_level
->level_chain
;
851 newlevel
= make_binding_level ();
854 /* Add this level to the front of the chain (stack) of levels that
857 *newlevel
= clear_binding_level
;
858 newlevel
->tag_transparent
860 || (current_binding_level
861 ? current_binding_level
->subblocks_tag_transparent
863 newlevel
->level_chain
= current_binding_level
;
864 current_binding_level
= newlevel
;
865 newlevel
->keep
= keep_next_level_flag
;
866 keep_next_level_flag
= 0;
867 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
868 keep_next_if_subblocks
= 0;
871 /* Exit a binding level.
872 Pop the level off, and restore the state of the identifier-decl mappings
873 that were in effect when this level was entered.
875 If KEEP is nonzero, this level had explicit declarations, so
876 and create a "block" (a BLOCK node) for the level
877 to record its declarations and subblocks for symbol table output.
879 If FUNCTIONBODY is nonzero, this level is the body of a function,
880 so create a block as if KEEP were set and also clear out all
883 If REVERSE is nonzero, reverse the order of decls before putting
884 them into the BLOCK. */
887 poplevel (keep
, reverse
, functionbody
)
893 /* The chain of decls was accumulated in reverse order.
894 Put it into forward order, just for cleanliness. */
896 tree tags
= current_binding_level
->tags
;
897 tree subblocks
= current_binding_level
->blocks
;
900 int block_previously_created
;
902 keep
|= current_binding_level
->keep
;
904 /* This warning is turned off because it causes warnings for
905 declarations like `extern struct foo *x'. */
907 /* Warn about incomplete structure types in this level. */
908 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
909 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
911 tree type
= TREE_VALUE (link
);
913 switch (TREE_CODE (type
))
916 errmsg
= "`struct %s' incomplete in scope ending here";
919 errmsg
= "`union %s' incomplete in scope ending here";
922 errmsg
= "`enum %s' incomplete in scope ending here";
925 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
926 error (errmsg
, IDENTIFIER_POINTER (TYPE_NAME (type
)));
928 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
929 error (errmsg
, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
))));
933 /* Get the decls in the order they were written.
934 Usually current_binding_level->names is in reverse order.
935 But parameter decls were previously put in forward order. */
938 current_binding_level
->names
939 = decls
= nreverse (current_binding_level
->names
);
941 decls
= current_binding_level
->names
;
943 /* Output any nested inline functions within this block
944 if they weren't already output. */
946 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
947 if (TREE_CODE (decl
) == FUNCTION_DECL
948 && ! TREE_ASM_WRITTEN (decl
)
949 && DECL_INITIAL (decl
) != 0
950 && TREE_ADDRESSABLE (decl
))
952 /* If this decl was copied from a file-scope decl
953 on account of a block-scope extern decl,
954 propagate TREE_ADDRESSABLE to the file-scope decl. */
955 if (DECL_ABSTRACT_ORIGIN (decl
) != 0)
956 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
959 push_function_context ();
960 output_inline_function (decl
);
961 pop_function_context ();
965 /* If there were any declarations or structure tags in that level,
966 or if this level is a function body,
967 create a BLOCK to record them for the life of this function. */
970 block_previously_created
= (current_binding_level
->this_block
!= 0);
971 if (block_previously_created
)
972 block
= current_binding_level
->this_block
;
973 else if (keep
|| functionbody
974 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
975 block
= make_node (BLOCK
);
978 BLOCK_VARS (block
) = decls
;
979 BLOCK_TYPE_TAGS (block
) = tags
;
980 BLOCK_SUBBLOCKS (block
) = subblocks
;
981 remember_end_note (block
);
984 /* In each subblock, record that this is its superior. */
986 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
987 BLOCK_SUPERCONTEXT (link
) = block
;
989 /* Clear out the meanings of the local variables of this level. */
991 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
993 if (DECL_NAME (link
) != 0)
995 /* If the ident. was used or addressed via a local extern decl,
996 don't forget that fact. */
997 if (DECL_EXTERNAL (link
))
999 if (TREE_USED (link
))
1000 TREE_USED (DECL_NAME (link
)) = 1;
1001 if (TREE_ADDRESSABLE (link
))
1002 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1004 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1008 /* Restore all name-meanings of the outer levels
1009 that were shadowed by this level. */
1011 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1012 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1014 /* If the level being exited is the top level of a function,
1015 check over all the labels, and clear out the current
1016 (function local) meanings of their names. */
1020 /* If this is the top level block of a function,
1021 the vars are the function's parameters.
1022 Don't leave them in the BLOCK because they are
1023 found in the FUNCTION_DECL instead. */
1025 BLOCK_VARS (block
) = 0;
1027 /* Clear out the definitions of all label names,
1028 since their scopes end here,
1029 and add them to BLOCK_VARS. */
1031 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1033 register tree label
= TREE_VALUE (link
);
1035 if (DECL_INITIAL (label
) == 0)
1037 error_with_decl (label
, "label `%s' used but not defined");
1038 /* Avoid crashing later. */
1039 define_label (input_filename
, lineno
,
1042 else if (warn_unused
&& !TREE_USED (label
))
1043 warning_with_decl (label
, "label `%s' defined but not used");
1044 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1046 /* Put the labels into the "variables" of the
1047 top-level block, so debugger can see them. */
1048 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1049 BLOCK_VARS (block
) = label
;
1053 /* Pop the current level, and free the structure for reuse. */
1056 register struct binding_level
*level
= current_binding_level
;
1057 current_binding_level
= current_binding_level
->level_chain
;
1059 level
->level_chain
= free_binding_level
;
1060 free_binding_level
= level
;
1063 /* Dispose of the block that we just made inside some higher level. */
1065 DECL_INITIAL (current_function_decl
) = block
;
1068 if (!block_previously_created
)
1069 current_binding_level
->blocks
1070 = chainon (current_binding_level
->blocks
, block
);
1072 /* If we did not make a block for the level just exited,
1073 any blocks made for inner levels
1074 (since they cannot be recorded as subblocks in that level)
1075 must be carried forward so they will later become subblocks
1076 of something else. */
1078 current_binding_level
->blocks
1079 = chainon (current_binding_level
->blocks
, subblocks
);
1081 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1082 binding contour so that they point to the appropriate construct, i.e.
1083 either to the current FUNCTION_DECL node, or else to the BLOCK node
1084 we just constructed.
1086 Note that for tagged types whose scope is just the formal parameter
1087 list for some function type specification, we can't properly set
1088 their TYPE_CONTEXTs here, because we don't have a pointer to the
1089 appropriate FUNCTION_TYPE node readily available to us. For those
1090 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1091 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1092 node which will represent the "scope" for these "parameter list local"
1097 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1098 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1100 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1101 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1104 TREE_USED (block
) = 1;
1108 /* Delete the node BLOCK from the current binding level.
1109 This is used for the block inside a stmt expr ({...})
1110 so that the block can be reinserted where appropriate. */
1113 delete_block (block
)
1117 if (current_binding_level
->blocks
== block
)
1118 current_binding_level
->blocks
= TREE_CHAIN (block
);
1119 for (t
= current_binding_level
->blocks
; t
;)
1121 if (TREE_CHAIN (t
) == block
)
1122 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1126 TREE_CHAIN (block
) = NULL
;
1127 /* Clear TREE_USED which is always set by poplevel.
1128 The flag is set again if insert_block is called. */
1129 TREE_USED (block
) = 0;
1132 /* Insert BLOCK at the end of the list of subblocks of the
1133 current binding level. This is used when a BIND_EXPR is expanded,
1134 to handle the BLOCK node inside the BIND_EXPR. */
1137 insert_block (block
)
1140 TREE_USED (block
) = 1;
1141 current_binding_level
->blocks
1142 = chainon (current_binding_level
->blocks
, block
);
1145 /* Set the BLOCK node for the innermost scope
1146 (the one we are currently in). */
1150 register tree block
;
1152 current_binding_level
->this_block
= block
;
1158 register struct binding_level
*newlevel
;
1160 /* Reuse or create a struct for this binding level. */
1162 if (free_binding_level
)
1164 newlevel
= free_binding_level
;
1165 free_binding_level
= free_binding_level
->level_chain
;
1169 newlevel
= make_binding_level ();
1172 /* Add this level to the front of the chain (stack) of label levels. */
1174 newlevel
->level_chain
= label_level_chain
;
1175 label_level_chain
= newlevel
;
1177 newlevel
->names
= named_labels
;
1178 newlevel
->shadowed
= shadowed_labels
;
1180 shadowed_labels
= 0;
1186 register struct binding_level
*level
= label_level_chain
;
1189 /* Clear out the definitions of the declared labels in this level.
1190 Leave in the list any ordinary, non-declared labels. */
1191 for (link
= named_labels
, prev
= 0; link
;)
1193 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1195 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1197 error_with_decl (TREE_VALUE (link
),
1198 "label `%s' used but not defined");
1199 /* Avoid crashing later. */
1200 define_label (input_filename
, lineno
,
1201 DECL_NAME (TREE_VALUE (link
)));
1203 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1204 warning_with_decl (TREE_VALUE (link
),
1205 "label `%s' defined but not used");
1206 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1208 /* Delete this element from the list. */
1209 link
= TREE_CHAIN (link
);
1211 TREE_CHAIN (prev
) = link
;
1213 named_labels
= link
;
1218 link
= TREE_CHAIN (link
);
1222 /* Bring back all the labels that were shadowed. */
1223 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1224 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1225 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1226 = TREE_VALUE (link
);
1228 named_labels
= chainon (named_labels
, level
->names
);
1229 shadowed_labels
= level
->shadowed
;
1231 /* Pop the current level, and free the structure for reuse. */
1232 label_level_chain
= label_level_chain
->level_chain
;
1233 level
->level_chain
= free_binding_level
;
1234 free_binding_level
= level
;
1237 /* Push a definition or a declaration of struct, union or enum tag "name".
1238 "type" should be the type node.
1239 We assume that the tag "name" is not already defined.
1241 Note that the definition may really be just a forward reference.
1242 In that case, the TYPE_SIZE will be zero. */
1245 pushtag (name
, type
)
1248 register struct binding_level
*b
;
1250 /* Find the proper binding level for this type tag. */
1252 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1257 /* Record the identifier as the type's name if it has none. */
1259 if (TYPE_NAME (type
) == 0)
1260 TYPE_NAME (type
) = name
;
1263 if (b
== global_binding_level
)
1264 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1266 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1268 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1269 tagged type we just added to the current binding level. This fake
1270 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1271 to output a representation of a tagged type, and it also gives
1272 us a convenient place to record the "scope start" address for the
1275 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1278 /* Handle when a new declaration NEWDECL
1279 has the same name as an old one OLDDECL
1280 in the same binding contour.
1281 Prints an error message if appropriate.
1283 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1284 Otherwise, return 0. */
1287 duplicate_decls (newdecl
, olddecl
)
1288 register tree newdecl
, olddecl
;
1290 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1291 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1292 && DECL_INITIAL (newdecl
) != 0);
1293 tree oldtype
= TREE_TYPE (olddecl
);
1294 tree newtype
= TREE_TYPE (newdecl
);
1296 if (TREE_CODE (newtype
) == ERROR_MARK
1297 || TREE_CODE (oldtype
) == ERROR_MARK
)
1300 /* New decl is completely inconsistent with the old one =>
1301 tell caller to replace the old one.
1302 This is always an error except in the case of shadowing a builtin. */
1303 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1305 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1306 && (DECL_BUILT_IN (olddecl
)
1307 || DECL_BUILT_IN_NONANSI (olddecl
)))
1309 /* If you declare a built-in or predefined function name as static,
1310 the old definition is overridden,
1311 but optionally warn this was a bad choice of name. */
1312 if (!TREE_PUBLIC (newdecl
))
1316 else if (DECL_BUILT_IN (olddecl
))
1317 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1319 warning_with_decl (newdecl
, "shadowing library function `%s'");
1321 /* Likewise, if the built-in is not ansi, then programs can
1322 override it even globally without an error. */
1323 else if (! DECL_BUILT_IN (olddecl
))
1324 warning_with_decl (newdecl
,
1325 "library function `%s' declared as non-function");
1327 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1328 warning_with_decl (newdecl
,
1329 "built-in function `%s' declared as non-function");
1331 warning_with_decl (newdecl
,
1332 "built-in function `%s' declared as non-function");
1336 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1337 error_with_decl (olddecl
, "previous declaration of `%s'");
1343 /* For real parm decl following a forward decl,
1344 return 1 so old decl will be reused. */
1345 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1346 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1349 /* The new declaration is the same kind of object as the old one.
1350 The declarations may partially match. Print warnings if they don't
1351 match enough. Ultimately, copy most of the information from the new
1352 decl to the old one, and keep using the old one. */
1354 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1355 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1356 && DECL_INITIAL (olddecl
) == 0)
1357 /* If -traditional, avoid error for redeclaring fcn
1358 after implicit decl. */
1360 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1361 && DECL_BUILT_IN (olddecl
))
1363 /* A function declaration for a built-in function. */
1364 if (!TREE_PUBLIC (newdecl
))
1366 /* If you declare a built-in function name as static, the
1367 built-in definition is overridden,
1368 but optionally warn this was a bad choice of name. */
1370 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1371 /* Discard the old built-in function. */
1374 else if (!types_match
)
1376 /* Accept the return type of the new declaration if same modes. */
1377 tree oldreturntype
= TREE_TYPE (TREE_TYPE (olddecl
));
1378 tree newreturntype
= TREE_TYPE (TREE_TYPE (newdecl
));
1379 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1381 /* Function types may be shared, so we can't just modify
1382 the return type of olddecl's function type. */
1384 = build_function_type (newreturntype
,
1385 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)));
1387 types_match
= comptypes (TREE_TYPE (newdecl
), newtype
);
1389 TREE_TYPE (olddecl
) = newtype
;
1391 /* Accept harmless mismatch in first argument type also.
1393 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1394 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0
1395 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))) != 0
1396 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl
))) != 0
1397 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))))
1399 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))))
1401 /* Function types may be shared, so we can't just modify
1402 the return type of olddecl's function type. */
1404 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl
)),
1405 tree_cons (NULL_TREE
,
1406 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl
))),
1407 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))));
1409 types_match
= comptypes (TREE_TYPE (newdecl
), newtype
);
1411 TREE_TYPE (olddecl
) = newtype
;
1416 /* If types don't match for a built-in, throw away the built-in. */
1417 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1421 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1422 && DECL_SOURCE_LINE (olddecl
) == 0)
1424 /* A function declaration for a predeclared function
1425 that isn't actually built in. */
1426 if (!TREE_PUBLIC (newdecl
))
1428 /* If you declare it as static, the
1429 default definition is overridden. */
1432 else if (!types_match
)
1434 /* If the types don't match, preserve volatility indication.
1435 Later on, we will discard everything else about the
1436 default declaration. */
1437 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1440 /* Permit char *foo () to match void *foo (...) if not pedantic,
1441 if one of them came from a system header file. */
1442 else if (!types_match
1443 && TREE_CODE (olddecl
) == FUNCTION_DECL
1444 && TREE_CODE (newdecl
) == FUNCTION_DECL
1445 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1446 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1447 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1448 || DECL_IN_SYSTEM_HEADER (newdecl
))
1449 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1450 && TYPE_ARG_TYPES (oldtype
) == 0
1451 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1452 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1454 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1455 && TYPE_ARG_TYPES (newtype
) == 0
1456 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1457 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1460 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1461 /* Make sure we keep void * as ret type, not char *. */
1462 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1463 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1465 else if (!types_match
1466 /* Permit char *foo (int, ...); followed by char *foo ();
1468 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1470 /* Return types must still match. */
1471 && comptypes (TREE_TYPE (oldtype
),
1472 TREE_TYPE (newtype
))
1473 && TYPE_ARG_TYPES (newtype
) == 0))
1475 error_with_decl (newdecl
, "conflicting types for `%s'");
1476 /* Check for function type mismatch
1477 involving an empty arglist vs a nonempty one. */
1478 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1479 && comptypes (TREE_TYPE (oldtype
),
1480 TREE_TYPE (newtype
))
1481 && ((TYPE_ARG_TYPES (oldtype
) == 0
1482 && DECL_INITIAL (olddecl
) == 0)
1484 (TYPE_ARG_TYPES (newtype
) == 0
1485 && DECL_INITIAL (newdecl
) == 0)))
1487 /* Classify the problem further. */
1488 register tree t
= TYPE_ARG_TYPES (oldtype
);
1490 t
= TYPE_ARG_TYPES (newtype
);
1491 for (; t
; t
= TREE_CHAIN (t
))
1493 register tree type
= TREE_VALUE (t
);
1495 if (TREE_CHAIN (t
) == 0
1496 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1498 error ("A parameter list with an ellipsis can't match");
1499 error ("an empty parameter name list declaration.");
1503 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1504 || C_PROMOTING_INTEGER_TYPE_P (type
))
1506 error ("An argument type that has a default promotion");
1507 error ("can't match an empty parameter name list declaration.");
1512 error_with_decl (olddecl
, "previous declaration of `%s'");
1516 char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1519 error_with_decl (newdecl
, errmsg
);
1520 error_with_decl (olddecl
,
1521 ((DECL_INITIAL (olddecl
)
1522 && current_binding_level
== global_binding_level
)
1523 ? "`%s' previously defined here"
1524 : "`%s' previously declared here"));
1526 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1527 && DECL_INITIAL (olddecl
) != 0
1528 && TYPE_ARG_TYPES (oldtype
) == 0
1529 && TYPE_ARG_TYPES (newtype
) != 0)
1531 register tree type
, parm
;
1533 /* Prototype decl follows defn w/o prototype. */
1535 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1536 type
= TYPE_ARG_TYPES (newtype
),
1538 (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) != void_type_node
1539 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
1540 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1542 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1543 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1545 errmsg
= "prototype for `%s' follows and number of arguments";
1548 /* Type for passing arg must be consistent
1549 with that declared for the arg. */
1550 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1551 /* If -traditional, allow `unsigned int' instead of `int'
1552 in the prototype. */
1553 && (! (flag_traditional
1554 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1555 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1557 errmsg
= "prototype for `%s' follows and argument %d";
1563 error_with_decl (newdecl
, errmsg
, nargs
);
1564 error_with_decl (olddecl
,
1565 "doesn't match non-prototype definition here");
1569 warning_with_decl (newdecl
, "prototype for `%s' follows");
1570 warning_with_decl (olddecl
, "non-prototype definition here");
1573 /* Warn about mismatches in various flags. */
1576 /* Warn if function is now inline
1577 but was previously declared not inline and has been called. */
1578 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1579 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1580 && TREE_USED (olddecl
))
1581 warning_with_decl (newdecl
,
1582 "`%s' declared inline after being called");
1583 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1584 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1585 && DECL_INITIAL (olddecl
) != 0)
1586 warning_with_decl (newdecl
,
1587 "`%s' declared inline after its definition");
1589 /* If pedantic, warn when static declaration follows a non-static
1590 declaration. Otherwise, do so only for functions. */
1591 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1592 && TREE_PUBLIC (olddecl
)
1593 && !TREE_PUBLIC (newdecl
))
1594 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1596 /* Warn when const declaration follows a non-const
1597 declaration, but not for functions. */
1598 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1599 && !TREE_READONLY (olddecl
)
1600 && TREE_READONLY (newdecl
))
1601 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1602 /* These bits are logically part of the type, for variables.
1603 But not for functions
1604 (where qualifiers are not valid ANSI anyway). */
1605 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1606 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1607 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1608 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1612 /* Optionally warn about more than one declaration for the same name. */
1613 if (warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1614 /* Dont warn about a function declaration
1615 followed by a definition. */
1616 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1617 && DECL_INITIAL (olddecl
) == 0)
1618 /* Don't warn about extern decl followed by (tentative) definition. */
1619 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1621 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1622 warning_with_decl (olddecl
, "previous declaration of `%s'");
1625 /* Copy all the DECL_... slots specified in the new decl
1626 except for any that we copy here from the old type.
1628 Past this point, we don't change OLDTYPE and NEWTYPE
1629 even if we change the types of NEWDECL and OLDDECL. */
1633 /* Make sure we put the new type in the same obstack as the old ones.
1634 If the old types are not both in the same obstack, use the permanent
1636 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1637 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1640 push_obstacks_nochange ();
1641 end_temporary_allocation ();
1644 /* Merge the data types specified in the two decls. */
1645 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1647 = TREE_TYPE (olddecl
)
1648 = common_type (newtype
, oldtype
);
1650 /* Lay the type out, unless already done. */
1651 if (oldtype
!= TREE_TYPE (newdecl
))
1653 if (TREE_TYPE (newdecl
) != error_mark_node
)
1654 layout_type (TREE_TYPE (newdecl
));
1655 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1656 && TREE_CODE (newdecl
) != TYPE_DECL
1657 && TREE_CODE (newdecl
) != CONST_DECL
)
1658 layout_decl (newdecl
, 0);
1662 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1663 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1664 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1665 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1666 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1669 /* Keep the old rtl since we can safely use it. */
1670 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1672 /* Merge the type qualifiers. */
1673 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1674 && !TREE_THIS_VOLATILE (newdecl
))
1675 TREE_THIS_VOLATILE (olddecl
) = 0;
1676 if (TREE_READONLY (newdecl
))
1677 TREE_READONLY (olddecl
) = 1;
1678 if (TREE_THIS_VOLATILE (newdecl
))
1680 TREE_THIS_VOLATILE (olddecl
) = 1;
1681 if (TREE_CODE (newdecl
) == VAR_DECL
)
1682 make_var_volatile (newdecl
);
1685 /* Keep source location of definition rather than declaration. */
1686 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1688 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1689 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1692 /* Merge the unused-warning information. */
1693 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1694 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1695 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1696 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1698 /* Merge the initialization information. */
1699 if (DECL_INITIAL (newdecl
) == 0)
1700 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1702 /* Merge the section attribute.
1703 We want to issue an error if the sections conflict but that must be
1704 done later in decl_attributes since we are called before attributes
1706 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1707 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1711 /* If cannot merge, then use the new type and qualifiers,
1712 and don't preserve the old rtl. */
1715 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1716 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1717 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1718 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1721 /* Merge the storage class information. */
1722 /* For functions, static overrides non-static. */
1723 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1725 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1726 /* This is since we don't automatically
1727 copy the attributes of NEWDECL into OLDDECL. */
1728 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1729 /* If this clears `static', clear it in the identifier too. */
1730 if (! TREE_PUBLIC (olddecl
))
1731 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1733 if (DECL_EXTERNAL (newdecl
))
1735 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1736 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1737 /* An extern decl does not override previous storage class. */
1738 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1742 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1743 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1746 /* If either decl says `inline', this fn is inline,
1747 unless its definition was passed already. */
1748 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1749 DECL_INLINE (olddecl
) = 1;
1750 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1752 /* Get rid of any built-in function if new arg types don't match it
1753 or if we have a function definition. */
1754 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1755 && DECL_BUILT_IN (olddecl
)
1756 && (!types_match
|| new_is_definition
))
1758 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1759 DECL_BUILT_IN (olddecl
) = 0;
1762 /* If redeclaring a builtin function, and not a definition,
1764 Also preserve various other info from the definition. */
1765 if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& !new_is_definition
)
1767 if (DECL_BUILT_IN (olddecl
))
1769 DECL_BUILT_IN (newdecl
) = 1;
1770 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1773 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
1775 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1776 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1777 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1778 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1781 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1782 But preserve OLDdECL's DECL_UID. */
1784 register unsigned olddecl_uid
= DECL_UID (olddecl
);
1786 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
1787 (char *) olddecl
+ sizeof (struct tree_common
),
1788 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1789 DECL_UID (olddecl
) = olddecl_uid
;
1795 /* Record a decl-node X as belonging to the current lexical scope.
1796 Check for errors (such as an incompatible declaration for the same
1797 name already seen in the same scope).
1799 Returns either X or an old decl for the same name.
1800 If an old decl is returned, it may have been smashed
1801 to agree with what X says. */
1808 register tree name
= DECL_NAME (x
);
1809 register struct binding_level
*b
= current_binding_level
;
1811 DECL_CONTEXT (x
) = current_function_decl
;
1812 /* A local extern declaration for a function doesn't constitute nesting.
1813 A local auto declaration does, since it's a forward decl
1814 for a nested function coming later. */
1815 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
1816 && DECL_EXTERNAL (x
))
1817 DECL_CONTEXT (x
) = 0;
1819 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
1820 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
1821 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1822 && !DECL_IN_SYSTEM_HEADER (x
))
1823 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
1830 if (DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
1831 t
= lookup_name (name
);
1833 t
= lookup_name_current_level (name
);
1834 if (t
!= 0 && t
== error_mark_node
)
1835 /* error_mark_node is 0 for a while during initialization! */
1838 error_with_decl (x
, "`%s' used prior to declaration");
1843 file
= DECL_SOURCE_FILE (t
);
1844 line
= DECL_SOURCE_LINE (t
);
1847 if (t
!= 0 && duplicate_decls (x
, t
))
1849 if (TREE_CODE (t
) == PARM_DECL
)
1851 /* Don't allow more than one "real" duplicate
1852 of a forward parm decl. */
1853 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
1856 /* If this decl is `static' and an implicit decl was seen previously,
1857 warn. But don't complain if -traditional,
1858 since traditional compilers don't complain. */
1859 if (!flag_traditional
&& TREE_PUBLIC (name
)
1860 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
)
1861 /* We used to warn also for explicit extern followed by static,
1862 but sometimes you need to do it that way. */
1863 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
1865 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1866 IDENTIFIER_POINTER (name
));
1867 pedwarn_with_file_and_line (file
, line
,
1868 "previous declaration of `%s'",
1869 IDENTIFIER_POINTER (name
));
1875 /* If we are processing a typedef statement, generate a whole new
1876 ..._TYPE node (which will be just an variant of the existing
1877 ..._TYPE node with identical properties) and then install the
1878 TYPE_DECL node generated to represent the typedef name as the
1879 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1881 The whole point here is to end up with a situation where each
1882 and every ..._TYPE node the compiler creates will be uniquely
1883 associated with AT MOST one node representing a typedef name.
1884 This way, even though the compiler substitutes corresponding
1885 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1886 early on, later parts of the compiler can always do the reverse
1887 translation and get back the corresponding typedef name. For
1890 typedef struct S MY_TYPE;
1893 Later parts of the compiler might only know that `object' was of
1894 type `struct S' if if were not for code just below. With this
1895 code however, later parts of the compiler see something like:
1897 struct S' == struct S
1898 typedef struct S' MY_TYPE;
1901 And they can then deduce (from the node for type struct S') that
1902 the original object declaration was:
1906 Being able to do this is important for proper support of protoize,
1907 and also for generating precise symbolic debugging information
1908 which takes full account of the programmer's (typedef) vocabulary.
1910 Obviously, we don't want to generate a duplicate ..._TYPE node if
1911 the TYPE_DECL node that we are now processing really represents a
1912 standard built-in type.
1914 Since all standard types are effectively declared at line zero
1915 in the source file, we can easily check to see if we are working
1916 on a standard type by checking the current value of lineno. */
1918 if (TREE_CODE (x
) == TYPE_DECL
)
1920 if (DECL_SOURCE_LINE (x
) == 0)
1922 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1923 TYPE_NAME (TREE_TYPE (x
)) = x
;
1925 else if (TREE_TYPE (x
) != error_mark_node
)
1927 tree tt
= TREE_TYPE (x
);
1929 tt
= build_type_copy (tt
);
1935 /* Multiple external decls of the same identifier ought to match.
1936 Check against out of scope (limbo) block level declarations.
1938 If this is a block level declaration, then DECL_EXTERNAL must also
1939 be set, so we have already checked against global declarations above
1940 via the lookup_name call.
1942 We get warnings about inline functions where they are defined.
1943 Avoid duplicate warnings where they are used. */
1944 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
)
1945 && IDENTIFIER_LIMBO_VALUE (name
))
1947 tree decl
= IDENTIFIER_LIMBO_VALUE (name
);
1949 if (! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
1950 /* If old decl is built-in, we already warned if we should. */
1951 && !DECL_BUILT_IN (decl
))
1953 pedwarn_with_decl (x
,
1954 "type mismatch with previous external decl");
1955 pedwarn_with_decl (decl
, "previous external decl of `%s'");
1959 /* If a function has had an implicit declaration, and then is defined,
1960 make sure they are compatible. */
1962 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
1963 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
1964 && TREE_CODE (x
) == FUNCTION_DECL
1965 && ! comptypes (TREE_TYPE (x
),
1966 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
1968 warning_with_decl (x
, "type mismatch with previous implicit declaration");
1969 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
1970 "previous implicit declaration of `%s'");
1973 /* In PCC-compatibility mode, extern decls of vars with no current decl
1974 take effect at top level no matter where they are. */
1975 if (flag_traditional
&& DECL_EXTERNAL (x
)
1976 && lookup_name (name
) == 0)
1978 tree type
= TREE_TYPE (x
);
1980 /* But don't do this if the type contains temporary nodes. */
1983 if (type
== error_mark_node
)
1985 if (! TREE_PERMANENT (type
))
1987 warning_with_decl (x
, "type of external `%s' is not global");
1988 /* By exiting the loop early, we leave TYPE nonzero,
1989 and thus prevent globalization of the decl. */
1992 else if (TREE_CODE (type
) == FUNCTION_TYPE
1993 && TYPE_ARG_TYPES (type
) != 0)
1994 /* The types might not be truly local,
1995 but the list of arg types certainly is temporary.
1996 Since prototypes are nontraditional,
1997 ok not to do the traditional thing. */
1999 type
= TREE_TYPE (type
);
2003 b
= global_binding_level
;
2006 /* This name is new in its binding level.
2007 Install the new declaration and return it. */
2008 if (b
== global_binding_level
)
2010 /* Install a global value. */
2012 /* If the first global decl has external linkage,
2013 warn if we later see static one. */
2014 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2015 TREE_PUBLIC (name
) = 1;
2017 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2019 /* We no longer care about any previous block level declarations. */
2020 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2022 /* Don't forget if the function was used via an implicit decl. */
2023 if (IDENTIFIER_IMPLICIT_DECL (name
)
2024 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2025 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2027 /* Don't forget if its address was taken in that way. */
2028 if (IDENTIFIER_IMPLICIT_DECL (name
)
2029 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2030 TREE_ADDRESSABLE (x
) = 1;
2032 /* Warn about mismatches against previous implicit decl. */
2033 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2034 /* If this real decl matches the implicit, don't complain. */
2035 && ! (TREE_CODE (x
) == FUNCTION_DECL
2036 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2037 == integer_type_node
)))
2038 pedwarn ("`%s' was previously implicitly declared to return `int'",
2039 IDENTIFIER_POINTER (name
));
2041 /* If this decl is `static' and an `extern' was seen previously,
2042 that is erroneous. */
2043 if (TREE_PUBLIC (name
)
2044 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2046 /* Okay to redeclare an ANSI built-in as static. */
2047 if (t
!= 0 && DECL_BUILT_IN (t
))
2049 /* Okay to declare a non-ANSI built-in as anything. */
2050 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2052 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2053 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2054 IDENTIFIER_POINTER (name
));
2056 pedwarn ("`%s' was declared `extern' and later `static'",
2057 IDENTIFIER_POINTER (name
));
2062 /* Here to install a non-global value. */
2063 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2064 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2065 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2067 /* If this is an extern function declaration, see if we
2068 have a global definition or declaration for the function. */
2070 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2072 && TREE_CODE (x
) == FUNCTION_DECL
2073 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2075 /* We have one. Their types must agree. */
2076 if (! comptypes (TREE_TYPE (x
),
2077 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2078 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2081 /* Inner extern decl is inline if global one is.
2082 Copy enough to really inline it. */
2083 if (DECL_INLINE (oldglobal
))
2085 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2086 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2087 ? 0 : DECL_INITIAL (oldglobal
));
2088 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2089 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2090 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2091 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2092 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2093 DECL_ABSTRACT_ORIGIN (x
) = oldglobal
;
2095 /* Inner extern decl is built-in if global one is. */
2096 if (DECL_BUILT_IN (oldglobal
))
2098 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2099 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2101 /* Keep the arg types from a file-scope fcn defn. */
2102 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2103 && DECL_INITIAL (oldglobal
)
2104 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2105 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2109 #if 0 /* This case is probably sometimes the right thing to do. */
2110 /* If we have a local external declaration,
2111 then any file-scope declaration should not
2112 have been static. */
2113 if (oldlocal
== 0 && oldglobal
!= 0
2114 && !TREE_PUBLIC (oldglobal
)
2115 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2116 warning ("`%s' locally external but globally static",
2117 IDENTIFIER_POINTER (name
));
2120 /* If we have a local external declaration,
2121 and no file-scope declaration has yet been seen,
2122 then if we later have a file-scope decl it must not be static. */
2125 && DECL_EXTERNAL (x
)
2128 TREE_PUBLIC (name
) = 1;
2130 /* Save this decl, so that we can do type checking against
2131 other decls after it falls out of scope.
2133 Only save it once. This prevents temporary decls created in
2134 expand_inline_function from being used here, since this
2135 will have been set when the inline function was parsed.
2136 It also helps give slightly better warnings. */
2137 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2138 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2141 /* Warn if shadowing an argument at the top level of the body. */
2142 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2143 /* This warning doesn't apply to the parms of a nested fcn. */
2144 && ! current_binding_level
->parm_flag
2145 /* Check that this is one level down from the parms. */
2146 && current_binding_level
->level_chain
->parm_flag
2147 /* Check that the decl being shadowed
2148 comes from the parm level, one level up. */
2149 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2151 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2152 pedwarn ("declaration of `%s' shadows a parameter",
2153 IDENTIFIER_POINTER (name
));
2155 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2156 IDENTIFIER_POINTER (name
));
2159 /* Maybe warn if shadowing something else. */
2160 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2161 /* No shadow warnings for internally generated vars. */
2162 && DECL_SOURCE_LINE (x
) != 0
2163 /* No shadow warnings for vars made for inlining. */
2164 && ! DECL_FROM_INLINE (x
))
2166 char *warnstring
= 0;
2168 if (TREE_CODE (x
) == PARM_DECL
2169 && current_binding_level
->level_chain
->parm_flag
)
2170 /* Don't warn about the parm names in function declarator
2171 within a function declarator.
2172 It would be nice to avoid warning in any function
2173 declarator in a declaration, as opposed to a definition,
2174 but there is no way to tell it's not a definition. */
2176 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2177 warnstring
= "declaration of `%s' shadows a parameter";
2178 else if (oldlocal
!= 0)
2179 warnstring
= "declaration of `%s' shadows previous local";
2180 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2181 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2182 warnstring
= "declaration of `%s' shadows global declaration";
2185 warning (warnstring
, IDENTIFIER_POINTER (name
));
2188 /* If storing a local value, there may already be one (inherited).
2189 If so, record it for restoration when this binding level ends. */
2191 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2194 /* Keep count of variables in this level with incomplete type. */
2195 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2199 /* Put decls on list in reverse order.
2200 We will reverse them later if necessary. */
2201 TREE_CHAIN (x
) = b
->names
;
2207 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2210 pushdecl_top_level (x
)
2214 register struct binding_level
*b
= current_binding_level
;
2216 current_binding_level
= global_binding_level
;
2218 current_binding_level
= b
;
2222 /* Generate an implicit declaration for identifier FUNCTIONID
2223 as a function of type int (). Print a warning if appropriate. */
2226 implicitly_declare (functionid
)
2230 int traditional_warning
= 0;
2231 /* Only one "implicit declaration" warning per identifier. */
2232 int implicit_warning
;
2234 /* Save the decl permanently so we can warn if definition follows. */
2235 push_obstacks_nochange ();
2236 end_temporary_allocation ();
2238 /* We used to reuse an old implicit decl here,
2239 but this loses with inline functions because it can clobber
2240 the saved decl chains. */
2241 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2242 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2244 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2246 /* Warn of implicit decl following explicit local extern decl.
2247 This is probably a program designed for traditional C. */
2248 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2249 traditional_warning
= 1;
2251 /* Warn once of an implicit declaration. */
2252 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2254 DECL_EXTERNAL (decl
) = 1;
2255 TREE_PUBLIC (decl
) = 1;
2257 /* Record that we have an implicit decl and this is it. */
2258 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2260 /* ANSI standard says implicit declarations are in the innermost block.
2261 So we record the decl in the standard fashion.
2262 If flag_traditional is set, pushdecl does it top-level. */
2265 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2266 maybe_objc_check_decl (decl
);
2268 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2270 if (warn_implicit
&& implicit_warning
)
2271 warning ("implicit declaration of function `%s'",
2272 IDENTIFIER_POINTER (functionid
));
2273 else if (warn_traditional
&& traditional_warning
)
2274 warning ("function `%s' was previously declared within a block",
2275 IDENTIFIER_POINTER (functionid
));
2277 /* Write a record describing this implicit function declaration to the
2278 prototypes file (if requested). */
2280 gen_aux_info_record (decl
, 0, 1, 0);
2287 /* Return zero if the declaration NEWDECL is valid
2288 when the declaration OLDDECL (assumed to be for the same name)
2289 has already been seen.
2290 Otherwise return an error message format string with a %s
2291 where the identifier should go. */
2294 redeclaration_error_message (newdecl
, olddecl
)
2295 tree newdecl
, olddecl
;
2297 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2299 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2301 return "redefinition of `%s'";
2303 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2305 /* Declarations of functions can insist on internal linkage
2306 but they can't be inconsistent with internal linkage,
2307 so there can be no error on that account.
2308 However defining the same name twice is no good. */
2309 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2310 /* However, defining once as extern inline and a second
2311 time in another way is ok. */
2312 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2313 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2314 return "redefinition of `%s'";
2317 else if (current_binding_level
== global_binding_level
)
2319 /* Objects declared at top level: */
2320 /* If at least one is a reference, it's ok. */
2321 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2323 /* Reject two definitions. */
2324 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2325 return "redefinition of `%s'";
2326 /* Now we have two tentative defs, or one tentative and one real def. */
2327 /* Insist that the linkage match. */
2328 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2329 return "conflicting declarations of `%s'";
2332 else if (current_binding_level
->parm_flag
2333 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2337 /* Newdecl has block scope. If olddecl has block scope also, then
2338 reject two definitions, and reject a definition together with an
2339 external reference. Otherwise, it is OK, because newdecl must
2340 be an extern reference to olddecl. */
2341 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2342 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2343 return "redeclaration of `%s'";
2348 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2349 Create one if none exists so far for the current function.
2350 This function is called for both label definitions and label references. */
2356 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2358 if (current_function_decl
== 0)
2360 error ("label %s referenced outside of any function",
2361 IDENTIFIER_POINTER (id
));
2365 /* Use a label already defined or ref'd with this name. */
2368 /* But not if it is inherited and wasn't declared to be inheritable. */
2369 if (DECL_CONTEXT (decl
) != current_function_decl
2370 && ! C_DECLARED_LABEL_FLAG (decl
))
2371 return shadow_label (id
);
2375 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2377 /* Make sure every label has an rtx. */
2380 /* A label not explicitly declared must be local to where it's ref'd. */
2381 DECL_CONTEXT (decl
) = current_function_decl
;
2383 DECL_MODE (decl
) = VOIDmode
;
2385 /* Say where one reference is to the label,
2386 for the sake of the error if it is not defined. */
2387 DECL_SOURCE_LINE (decl
) = lineno
;
2388 DECL_SOURCE_FILE (decl
) = input_filename
;
2390 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2392 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2397 /* Make a label named NAME in the current function,
2398 shadowing silently any that may be inherited from containing functions
2399 or containing scopes.
2401 Note that valid use, if the label being shadowed
2402 comes from another scope in the same function,
2403 requires calling declare_nonlocal_label right away. */
2409 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2413 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2414 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2417 return lookup_label (name
);
2420 /* Define a label, specifying the location in the source file.
2421 Return the LABEL_DECL node for the label, if the definition is valid.
2422 Otherwise return 0. */
2425 define_label (filename
, line
, name
)
2430 tree decl
= lookup_label (name
);
2432 /* If label with this name is known from an outer context, shadow it. */
2433 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2435 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2436 IDENTIFIER_LABEL_VALUE (name
) = 0;
2437 decl
= lookup_label (name
);
2440 if (DECL_INITIAL (decl
) != 0)
2442 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2447 /* Mark label as having been defined. */
2448 DECL_INITIAL (decl
) = error_mark_node
;
2449 /* Say where in the source. */
2450 DECL_SOURCE_FILE (decl
) = filename
;
2451 DECL_SOURCE_LINE (decl
) = line
;
2456 /* Return the list of declarations of the current level.
2457 Note that this list is in reverse order unless/until
2458 you nreverse it; and when you do nreverse it, you must
2459 store the result back using `storedecls' or you will lose. */
2464 return current_binding_level
->names
;
2467 /* Return the list of type-tags (for structs, etc) of the current level. */
2472 return current_binding_level
->tags
;
2475 /* Store the list of declarations of the current level.
2476 This is done for the parameter declarations of a function being defined,
2477 after they are modified in the light of any missing parameters. */
2483 current_binding_level
->names
= decls
;
2486 /* Similarly, store the list of tags of the current level. */
2492 current_binding_level
->tags
= tags
;
2495 /* Given NAME, an IDENTIFIER_NODE,
2496 return the structure (or union or enum) definition for that name.
2497 Searches binding levels from BINDING_LEVEL up to the global level.
2498 If THISLEVEL_ONLY is nonzero, searches only the specified context
2499 (but skips any tag-transparent contexts to find one that is
2500 meaningful for tags).
2501 CODE says which kind of type the caller wants;
2502 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2503 If the wrong kind of type is found, an error is reported. */
2506 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2507 enum tree_code code
;
2508 struct binding_level
*binding_level
;
2512 register struct binding_level
*level
;
2514 for (level
= binding_level
; level
; level
= level
->level_chain
)
2517 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2519 if (TREE_PURPOSE (tail
) == name
)
2521 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2523 /* Definition isn't the kind we were looking for. */
2524 pending_invalid_xref
= name
;
2525 pending_invalid_xref_file
= input_filename
;
2526 pending_invalid_xref_line
= lineno
;
2528 return TREE_VALUE (tail
);
2531 if (thislevel_only
&& ! level
->tag_transparent
)
2537 /* Print an error message now
2538 for a recent invalid struct, union or enum cross reference.
2539 We don't print them immediately because they are not invalid
2540 when used in the `struct foo;' construct for shadowing. */
2543 pending_xref_error ()
2545 if (pending_invalid_xref
!= 0)
2546 error_with_file_and_line (pending_invalid_xref_file
,
2547 pending_invalid_xref_line
,
2548 "`%s' defined as wrong kind of tag",
2549 IDENTIFIER_POINTER (pending_invalid_xref
));
2550 pending_invalid_xref
= 0;
2553 /* Given a type, find the tag that was defined for it and return the tag name.
2554 Otherwise return 0. */
2557 lookup_tag_reverse (type
)
2560 register struct binding_level
*level
;
2562 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2565 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2567 if (TREE_VALUE (tail
) == type
)
2568 return TREE_PURPOSE (tail
);
2574 /* Look up NAME in the current binding level and its superiors
2575 in the namespace of variables, functions and typedefs.
2576 Return a ..._DECL node of some kind representing its definition,
2577 or return 0 if it is undefined. */
2584 if (current_binding_level
!= global_binding_level
2585 && IDENTIFIER_LOCAL_VALUE (name
))
2586 val
= IDENTIFIER_LOCAL_VALUE (name
);
2588 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2592 /* Similar to `lookup_name' but look only at current binding level. */
2595 lookup_name_current_level (name
)
2600 if (current_binding_level
== global_binding_level
)
2601 return IDENTIFIER_GLOBAL_VALUE (name
);
2603 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2606 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2607 if (DECL_NAME (t
) == name
)
2613 /* Create the predefined scalar types of C,
2614 and some nodes representing standard constants (0, 1, (void *)0).
2615 Initialize the global binding level.
2616 Make definitions for built-in primitive functions. */
2619 init_decl_processing ()
2621 register tree endlink
;
2622 /* Either char* or void*. */
2623 tree traditional_ptr_type_node
;
2624 /* Data types of memcpy and strlen. */
2625 tree memcpy_ftype
, strlen_ftype
;
2626 tree void_ftype_any
;
2627 int wchar_type_size
;
2629 tree array_domain_type
;
2631 current_function_decl
= NULL
;
2632 named_labels
= NULL
;
2633 current_binding_level
= NULL_BINDING_LEVEL
;
2634 free_binding_level
= NULL_BINDING_LEVEL
;
2635 pushlevel (0); /* make the binding_level structure for global names */
2636 global_binding_level
= current_binding_level
;
2638 /* Define `int' and `char' first so that dbx will output them first. */
2640 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2641 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2642 integer_type_node
));
2644 /* Define `char', which is like either `signed char' or `unsigned char'
2645 but not the same as either. */
2649 ? make_signed_type (CHAR_TYPE_SIZE
)
2650 : make_unsigned_type (CHAR_TYPE_SIZE
));
2651 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2654 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2655 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2656 long_integer_type_node
));
2658 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2659 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2660 unsigned_type_node
));
2662 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
2663 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
2664 long_unsigned_type_node
));
2666 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
2667 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
2668 long_long_integer_type_node
));
2670 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
2671 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
2672 long_long_unsigned_type_node
));
2674 /* `unsigned long' is the standard type for sizeof.
2675 Traditionally, use a signed type.
2676 Note that stddef.h uses `unsigned long',
2677 and this must agree, even of long and int are the same size. */
2679 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
)));
2680 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
2681 sizetype
= signed_type (sizetype
);
2684 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
2686 TREE_TYPE (TYPE_SIZE (integer_type_node
)) = sizetype
;
2687 TREE_TYPE (TYPE_SIZE (char_type_node
)) = sizetype
;
2688 TREE_TYPE (TYPE_SIZE (unsigned_type_node
)) = sizetype
;
2689 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node
)) = sizetype
;
2690 TREE_TYPE (TYPE_SIZE (long_integer_type_node
)) = sizetype
;
2691 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node
)) = sizetype
;
2692 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node
)) = sizetype
;
2694 error_mark_node
= make_node (ERROR_MARK
);
2695 TREE_TYPE (error_mark_node
) = error_mark_node
;
2697 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
2698 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
2699 short_integer_type_node
));
2701 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
2702 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
2703 short_unsigned_type_node
));
2705 /* Define both `signed char' and `unsigned char'. */
2706 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
2707 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
2708 signed_char_type_node
));
2710 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
2711 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
2712 unsigned_char_type_node
));
2714 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
2715 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
2717 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
2718 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
2720 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
2721 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
2723 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
2724 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
2726 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
2727 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
2729 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
2730 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
2732 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
2733 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
2735 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
2736 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
2738 float_type_node
= make_node (REAL_TYPE
);
2739 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
2740 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
2742 layout_type (float_type_node
);
2744 double_type_node
= make_node (REAL_TYPE
);
2745 if (flag_short_double
)
2746 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
2748 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
2749 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
2751 layout_type (double_type_node
);
2753 long_double_type_node
= make_node (REAL_TYPE
);
2754 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
2755 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
2756 long_double_type_node
));
2757 layout_type (long_double_type_node
);
2759 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
2760 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
2761 complex_integer_type_node
));
2762 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
2763 layout_type (complex_integer_type_node
);
2765 complex_float_type_node
= make_node (COMPLEX_TYPE
);
2766 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
2767 complex_float_type_node
));
2768 TREE_TYPE (complex_float_type_node
) = float_type_node
;
2769 layout_type (complex_float_type_node
);
2771 complex_double_type_node
= make_node (COMPLEX_TYPE
);
2772 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
2773 complex_double_type_node
));
2774 TREE_TYPE (complex_double_type_node
) = double_type_node
;
2775 layout_type (complex_double_type_node
);
2777 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
2778 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2779 complex_long_double_type_node
));
2780 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
2781 layout_type (complex_long_double_type_node
);
2784 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
2785 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
2786 signed_wchar_type_node
= signed_type (wchar_type_node
);
2787 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
2789 integer_zero_node
= build_int_2 (0, 0);
2790 TREE_TYPE (integer_zero_node
) = integer_type_node
;
2791 integer_one_node
= build_int_2 (1, 0);
2792 TREE_TYPE (integer_one_node
) = integer_type_node
;
2794 size_zero_node
= build_int_2 (0, 0);
2795 TREE_TYPE (size_zero_node
) = sizetype
;
2796 size_one_node
= build_int_2 (1, 0);
2797 TREE_TYPE (size_one_node
) = sizetype
;
2799 void_type_node
= make_node (VOID_TYPE
);
2800 pushdecl (build_decl (TYPE_DECL
,
2801 ridpointers
[(int) RID_VOID
], void_type_node
));
2802 layout_type (void_type_node
); /* Uses integer_zero_node */
2803 /* We are not going to have real types in C with less than byte alignment,
2804 so we might as well not have any types that claim to have it. */
2805 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
2807 null_pointer_node
= build_int_2 (0, 0);
2808 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
2809 layout_type (TREE_TYPE (null_pointer_node
));
2811 string_type_node
= build_pointer_type (char_type_node
);
2812 const_string_type_node
2813 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
2815 /* Make a type to be the domain of a few array types
2816 whose domains don't really matter.
2817 200 is small enough that it always fits in size_t
2818 and large enough that it can hold most function names for the
2819 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2820 array_domain_type
= build_index_type (build_int_2 (200, 0));
2822 /* make a type for arrays of characters.
2823 With luck nothing will ever really depend on the length of this
2825 char_array_type_node
2826 = build_array_type (char_type_node
, array_domain_type
);
2827 /* Likewise for arrays of ints. */
2829 = build_array_type (integer_type_node
, array_domain_type
);
2830 /* This is for wide string constants. */
2831 wchar_array_type_node
2832 = build_array_type (wchar_type_node
, array_domain_type
);
2834 default_function_type
2835 = build_function_type (integer_type_node
, NULL_TREE
);
2837 ptr_type_node
= build_pointer_type (void_type_node
);
2839 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
2841 endlink
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
2844 = build_function_type (void_type_node
, NULL_TREE
);
2847 = build_function_type (double_type_node
,
2848 tree_cons (NULL_TREE
, double_type_node
, endlink
));
2850 double_ftype_double_double
2851 = build_function_type (double_type_node
,
2852 tree_cons (NULL_TREE
, double_type_node
,
2853 tree_cons (NULL_TREE
,
2854 double_type_node
, endlink
)));
2857 = build_function_type (integer_type_node
,
2858 tree_cons (NULL_TREE
, integer_type_node
, endlink
));
2861 = build_function_type (long_integer_type_node
,
2862 tree_cons (NULL_TREE
,
2863 long_integer_type_node
, endlink
));
2865 void_ftype_ptr_ptr_int
2866 = build_function_type (void_type_node
,
2867 tree_cons (NULL_TREE
, ptr_type_node
,
2868 tree_cons (NULL_TREE
, ptr_type_node
,
2869 tree_cons (NULL_TREE
,
2873 int_ftype_cptr_cptr_sizet
2874 = build_function_type (integer_type_node
,
2875 tree_cons (NULL_TREE
, const_ptr_type_node
,
2876 tree_cons (NULL_TREE
, const_ptr_type_node
,
2877 tree_cons (NULL_TREE
,
2881 void_ftype_ptr_int_int
2882 = build_function_type (void_type_node
,
2883 tree_cons (NULL_TREE
, ptr_type_node
,
2884 tree_cons (NULL_TREE
, integer_type_node
,
2885 tree_cons (NULL_TREE
,
2889 string_ftype_ptr_ptr
/* strcpy prototype */
2890 = build_function_type (string_type_node
,
2891 tree_cons (NULL_TREE
, string_type_node
,
2892 tree_cons (NULL_TREE
,
2893 const_string_type_node
,
2896 int_ftype_string_string
/* strcmp prototype */
2897 = build_function_type (integer_type_node
,
2898 tree_cons (NULL_TREE
, const_string_type_node
,
2899 tree_cons (NULL_TREE
,
2900 const_string_type_node
,
2903 strlen_ftype
/* strlen prototype */
2904 = build_function_type (flag_traditional
? integer_type_node
: sizetype
,
2905 tree_cons (NULL_TREE
, const_string_type_node
,
2908 traditional_ptr_type_node
2909 = (flag_traditional
? string_type_node
: ptr_type_node
);
2911 memcpy_ftype
/* memcpy prototype */
2912 = build_function_type (traditional_ptr_type_node
,
2913 tree_cons (NULL_TREE
, ptr_type_node
,
2914 tree_cons (NULL_TREE
, const_ptr_type_node
,
2915 tree_cons (NULL_TREE
,
2919 builtin_function ("__builtin_constant_p", int_ftype_int
,
2920 BUILT_IN_CONSTANT_P
, NULL_PTR
);
2922 builtin_function ("__builtin_return_address",
2923 build_function_type (ptr_type_node
,
2924 tree_cons (NULL_TREE
,
2927 BUILT_IN_RETURN_ADDRESS
, NULL_PTR
);
2929 builtin_function ("__builtin_frame_address",
2930 build_function_type (ptr_type_node
,
2931 tree_cons (NULL_TREE
,
2934 BUILT_IN_FRAME_ADDRESS
, NULL_PTR
);
2936 builtin_function ("__builtin_alloca",
2937 build_function_type (ptr_type_node
,
2938 tree_cons (NULL_TREE
,
2941 BUILT_IN_ALLOCA
, "alloca");
2942 builtin_function ("__builtin_ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
2943 /* Define alloca, ffs as builtins.
2944 Declare _exit just to mark it as volatile. */
2945 if (! flag_no_builtin
&& !flag_no_nonansi_builtin
)
2947 temp
= builtin_function ("alloca",
2948 build_function_type (ptr_type_node
,
2949 tree_cons (NULL_TREE
,
2952 BUILT_IN_ALLOCA
, NULL_PTR
);
2953 /* Suppress error if redefined as a non-function. */
2954 DECL_BUILT_IN_NONANSI (temp
) = 1;
2955 temp
= builtin_function ("ffs", int_ftype_int
, BUILT_IN_FFS
, NULL_PTR
);
2956 /* Suppress error if redefined as a non-function. */
2957 DECL_BUILT_IN_NONANSI (temp
) = 1;
2958 temp
= builtin_function ("_exit", void_ftype_any
, NOT_BUILT_IN
,
2960 TREE_THIS_VOLATILE (temp
) = 1;
2961 TREE_SIDE_EFFECTS (temp
) = 1;
2962 /* Suppress error if redefined as a non-function. */
2963 DECL_BUILT_IN_NONANSI (temp
) = 1;
2966 builtin_function ("__builtin_abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
2967 builtin_function ("__builtin_fabs", double_ftype_double
, BUILT_IN_FABS
,
2969 builtin_function ("__builtin_labs", long_ftype_long
, BUILT_IN_LABS
,
2971 builtin_function ("__builtin_saveregs",
2972 build_function_type (ptr_type_node
, NULL_TREE
),
2973 BUILT_IN_SAVEREGS
, NULL_PTR
);
2974 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2976 builtin_function ("__builtin_varargs",
2977 build_function_type (ptr_type_node
,
2978 tree_cons (NULL_TREE
,
2981 BUILT_IN_VARARGS
, NULL_PTR
);
2983 builtin_function ("__builtin_classify_type", default_function_type
,
2984 BUILT_IN_CLASSIFY_TYPE
, NULL_PTR
);
2985 builtin_function ("__builtin_next_arg",
2986 build_function_type (ptr_type_node
, NULL_TREE
),
2987 BUILT_IN_NEXT_ARG
, NULL_PTR
);
2988 builtin_function ("__builtin_args_info",
2989 build_function_type (integer_type_node
,
2990 tree_cons (NULL_TREE
,
2993 BUILT_IN_ARGS_INFO
, NULL_PTR
);
2995 /* Untyped call and return. */
2996 builtin_function ("__builtin_apply_args",
2997 build_function_type (ptr_type_node
, NULL_TREE
),
2998 BUILT_IN_APPLY_ARGS
, NULL_PTR
);
3000 temp
= tree_cons (NULL_TREE
,
3001 build_pointer_type (build_function_type (void_type_node
,
3003 tree_cons (NULL_TREE
,
3005 tree_cons (NULL_TREE
,
3008 builtin_function ("__builtin_apply",
3009 build_function_type (ptr_type_node
, temp
),
3010 BUILT_IN_APPLY
, NULL_PTR
);
3011 builtin_function ("__builtin_return",
3012 build_function_type (void_type_node
,
3013 tree_cons (NULL_TREE
,
3016 BUILT_IN_RETURN
, NULL_PTR
);
3018 /* Currently under experimentation. */
3019 builtin_function ("__builtin_memcpy", memcpy_ftype
,
3020 BUILT_IN_MEMCPY
, "memcpy");
3021 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet
,
3022 BUILT_IN_MEMCMP
, "memcmp");
3023 builtin_function ("__builtin_strcmp", int_ftype_string_string
,
3024 BUILT_IN_STRCMP
, "strcmp");
3025 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr
,
3026 BUILT_IN_STRCPY
, "strcpy");
3027 builtin_function ("__builtin_strlen", strlen_ftype
,
3028 BUILT_IN_STRLEN
, "strlen");
3029 builtin_function ("__builtin_fsqrt", double_ftype_double
,
3030 BUILT_IN_FSQRT
, "sqrt");
3031 builtin_function ("__builtin_sin", double_ftype_double
,
3032 BUILT_IN_SIN
, "sin");
3033 builtin_function ("__builtin_cos", double_ftype_double
,
3034 BUILT_IN_COS
, "cos");
3036 /* In an ANSI C program, it is okay to supply built-in meanings
3037 for these functions, since applications cannot validly use them
3038 with any other meaning.
3039 However, honor the -fno-builtin option. */
3040 if (!flag_no_builtin
)
3042 builtin_function ("abs", int_ftype_int
, BUILT_IN_ABS
, NULL_PTR
);
3043 builtin_function ("fabs", double_ftype_double
, BUILT_IN_FABS
, NULL_PTR
);
3044 builtin_function ("labs", long_ftype_long
, BUILT_IN_LABS
, NULL_PTR
);
3045 builtin_function ("memcpy", memcpy_ftype
, BUILT_IN_MEMCPY
, NULL_PTR
);
3046 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet
, BUILT_IN_MEMCMP
,
3048 builtin_function ("strcmp", int_ftype_string_string
, BUILT_IN_STRCMP
,
3050 builtin_function ("strcpy", string_ftype_ptr_ptr
, BUILT_IN_STRCPY
,
3052 builtin_function ("strlen", strlen_ftype
, BUILT_IN_STRLEN
, NULL_PTR
);
3053 builtin_function ("sqrt", double_ftype_double
, BUILT_IN_FSQRT
, NULL_PTR
);
3054 builtin_function ("sin", double_ftype_double
, BUILT_IN_SIN
, NULL_PTR
);
3055 builtin_function ("cos", double_ftype_double
, BUILT_IN_COS
, NULL_PTR
);
3057 /* Declare these functions volatile
3058 to avoid spurious "control drops through" warnings. */
3059 /* Don't specify the argument types, to avoid errors
3060 from certain code which isn't valid in ANSI but which exists. */
3061 temp
= builtin_function ("abort", void_ftype_any
, NOT_BUILT_IN
,
3063 TREE_THIS_VOLATILE (temp
) = 1;
3064 TREE_SIDE_EFFECTS (temp
) = 1;
3065 temp
= builtin_function ("exit", void_ftype_any
, NOT_BUILT_IN
, NULL_PTR
);
3066 TREE_THIS_VOLATILE (temp
) = 1;
3067 TREE_SIDE_EFFECTS (temp
) = 1;
3071 /* Support for these has not been written in either expand_builtin
3072 or build_function_call. */
3073 builtin_function ("__builtin_div", default_ftype
, BUILT_IN_DIV
, NULL_PTR
);
3074 builtin_function ("__builtin_ldiv", default_ftype
, BUILT_IN_LDIV
, NULL_PTR
);
3075 builtin_function ("__builtin_ffloor", double_ftype_double
, BUILT_IN_FFLOOR
,
3077 builtin_function ("__builtin_fceil", double_ftype_double
, BUILT_IN_FCEIL
,
3079 builtin_function ("__builtin_fmod", double_ftype_double_double
,
3080 BUILT_IN_FMOD
, NULL_PTR
);
3081 builtin_function ("__builtin_frem", double_ftype_double_double
,
3082 BUILT_IN_FREM
, NULL_PTR
);
3083 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int
,
3084 BUILT_IN_MEMSET
, NULL_PTR
);
3085 builtin_function ("__builtin_getexp", double_ftype_double
, BUILT_IN_GETEXP
,
3087 builtin_function ("__builtin_getman", double_ftype_double
, BUILT_IN_GETMAN
,
3091 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3092 declare_function_name ();
3094 start_identifier_warnings ();
3096 /* Prepare to check format strings against argument lists. */
3097 init_function_format_info ();
3101 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3104 /* Return a definition for a builtin function named NAME and whose data type
3105 is TYPE. TYPE should be a function type with argument types.
3106 FUNCTION_CODE tells later passes how to compile calls to this function.
3107 See tree.h for its possible values.
3109 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3110 the name to be called if we can't opencode the function. */
3113 builtin_function (name
, type
, function_code
, library_name
)
3116 enum built_in_function function_code
;
3119 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3120 DECL_EXTERNAL (decl
) = 1;
3121 TREE_PUBLIC (decl
) = 1;
3122 /* If -traditional, permit redefining a builtin function any way you like.
3123 (Though really, if the program redefines these functions,
3124 it probably won't work right unless compiled with -fno-builtin.) */
3125 if (flag_traditional
&& name
[0] != '_')
3126 DECL_BUILT_IN_NONANSI (decl
) = 1;
3128 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3129 make_decl_rtl (decl
, NULL_PTR
, 1);
3131 if (function_code
!= NOT_BUILT_IN
)
3133 DECL_BUILT_IN (decl
) = 1;
3134 DECL_FUNCTION_CODE (decl
) = function_code
;
3136 /* Warn if a function in the namespace for users
3137 is used without an occasion to consider it declared. */
3138 if (name
[0] != '_' || name
[1] != '_')
3139 C_DECL_ANTICIPATED (decl
) = 1;
3144 /* Called when a declaration is seen that contains no names to declare.
3145 If its type is a reference to a structure, union or enum inherited
3146 from a containing scope, shadow that tag name for the current scope
3147 with a forward reference.
3148 If its type defines a new named structure or union
3149 or defines an enum, it is valid but we need not do anything here.
3150 Otherwise, it is an error. */
3153 shadow_tag (declspecs
)
3156 shadow_tag_warned (declspecs
, 0);
3160 shadow_tag_warned (declspecs
, warned
)
3163 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3169 pending_invalid_xref
= 0;
3171 for (link
= declspecs
; link
; link
= TREE_CHAIN (link
))
3173 register tree value
= TREE_VALUE (link
);
3174 register enum tree_code code
= TREE_CODE (value
);
3176 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3177 /* Used to test also that TYPE_SIZE (value) != 0.
3178 That caused warning for `struct foo;' at top level in the file. */
3180 register tree name
= lookup_tag_reverse (value
);
3187 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3188 /* Empty unnamed enum OK */
3190 pedwarn ("unnamed struct/union that defines no instances");
3196 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3200 t
= make_node (code
);
3209 warning ("useless keyword or type name in empty declaration");
3216 error ("two types specified in one empty declaration");
3221 pedwarn ("empty declaration");
3225 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3228 groktypename (typename
)
3231 if (TREE_CODE (typename
) != TREE_LIST
)
3233 return grokdeclarator (TREE_VALUE (typename
),
3234 TREE_PURPOSE (typename
),
3238 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3241 groktypename_in_parm_context (typename
)
3244 if (TREE_CODE (typename
) != TREE_LIST
)
3246 return grokdeclarator (TREE_VALUE (typename
),
3247 TREE_PURPOSE (typename
),
3251 /* Decode a declarator in an ordinary declaration or data definition.
3252 This is called as soon as the type information and variable name
3253 have been parsed, before parsing the initializer if any.
3254 Here we create the ..._DECL node, fill in its type,
3255 and put it on the list of decls for the current context.
3256 The ..._DECL node is returned as the value.
3258 Exception: for arrays where the length is not specified,
3259 the type is left null, to be filled in by `finish_decl'.
3261 Function definitions do not come here; they go to start_function
3262 instead. However, external and forward declarations of functions
3263 do go through here. Structure field declarations are done by
3264 grokfield and not through here. */
3266 /* Set this to zero to debug not using the temporary obstack
3267 to parse initializers. */
3268 int debug_temp_inits
= 1;
3271 start_decl (declarator
, declspecs
, initialized
)
3272 tree declarator
, declspecs
;
3275 register tree decl
= grokdeclarator (declarator
, declspecs
,
3276 NORMAL
, initialized
);
3278 int init_written
= initialized
;
3280 /* The corresponding pop_obstacks is in finish_decl. */
3281 push_obstacks_nochange ();
3284 /* Is it valid for this decl to have an initializer at all?
3285 If not, set INITIALIZED to zero, which will indirectly
3286 tell `finish_decl' to ignore the initializer once it is parsed. */
3287 switch (TREE_CODE (decl
))
3290 /* typedef foo = bar means give foo the same type as bar.
3291 We haven't parsed bar yet, so `finish_decl' will fix that up.
3292 Any other case of an initialization in a TYPE_DECL is an error. */
3293 if (pedantic
|| list_length (declspecs
) > 1)
3295 error ("typedef `%s' is initialized",
3296 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3302 error ("function `%s' is initialized like a variable",
3303 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3308 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3309 error ("parameter `%s' is initialized",
3310 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3315 /* Don't allow initializations for incomplete types
3316 except for arrays which might be completed by the initialization. */
3317 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3319 /* A complete type is ok if size is fixed. */
3321 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3322 || C_DECL_VARIABLE_SIZE (decl
))
3324 error ("variable-sized object may not be initialized");
3328 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3330 error ("variable `%s' has initializer but incomplete type",
3331 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3334 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3336 error ("elements of array `%s' have incomplete type",
3337 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3344 #if 0 /* Seems redundant with grokdeclarator. */
3345 if (current_binding_level
!= global_binding_level
3346 && DECL_EXTERNAL (decl
)
3347 && TREE_CODE (decl
) != FUNCTION_DECL
)
3348 warning ("declaration of `%s' has `extern' and is initialized",
3349 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3351 DECL_EXTERNAL (decl
) = 0;
3352 if (current_binding_level
== global_binding_level
)
3353 TREE_STATIC (decl
) = 1;
3355 /* Tell `pushdecl' this is an initialized decl
3356 even though we don't yet have the initializer expression.
3357 Also tell `finish_decl' it may store the real initializer. */
3358 DECL_INITIAL (decl
) = error_mark_node
;
3361 /* If this is a function declaration, write a record describing it to the
3362 prototypes file (if requested). */
3364 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3365 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3367 /* Add this decl to the current binding level.
3368 TEM may equal DECL or it may be a previous decl of the same name. */
3369 tem
= pushdecl (decl
);
3371 /* For C and Obective-C, we by default put things in .common when
3373 DECL_COMMON (tem
) = 1;
3375 /* For a local variable, define the RTL now. */
3376 if (current_binding_level
!= global_binding_level
3377 /* But not if this is a duplicate decl
3378 and we preserved the rtl from the previous one
3379 (which may or may not happen). */
3380 && DECL_RTL (tem
) == 0)
3382 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3384 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3385 && DECL_INITIAL (tem
) != 0)
3391 /* When parsing and digesting the initializer,
3392 use temporary storage. Do this even if we will ignore the value. */
3393 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3394 temporary_allocation ();
3400 /* Finish processing of a declaration;
3401 install its initial value.
3402 If the length of an array type is not known before,
3403 it must be determined now, from the initial value, or it is an error. */
3406 finish_decl (decl
, init
, asmspec_tree
)
3410 register tree type
= TREE_TYPE (decl
);
3411 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3412 int temporary
= allocation_temporary_p ();
3415 /* If a name was specified, get the string. */
3417 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3419 /* If `start_decl' didn't like having an initialization, ignore it now. */
3421 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3423 /* Don't crash if parm is initialized. */
3424 if (TREE_CODE (decl
) == PARM_DECL
)
3427 if (ITERATOR_P (decl
))
3430 error_with_decl (decl
, "iterator has no initial value");
3432 init
= save_expr (init
);
3437 if (TREE_CODE (decl
) != TYPE_DECL
)
3438 store_init_value (decl
, init
);
3441 /* typedef foo = bar; store the type of bar as the type of foo. */
3442 TREE_TYPE (decl
) = TREE_TYPE (init
);
3443 DECL_INITIAL (decl
) = init
= 0;
3447 /* Pop back to the obstack that is current for this binding level.
3448 This is because MAXINDEX, rtl, etc. to be made below
3449 must go in the permanent obstack. But don't discard the
3450 temporary data yet. */
3452 #if 0 /* pop_obstacks was near the end; this is what was here. */
3453 if (current_binding_level
== global_binding_level
&& temporary
)
3454 end_temporary_allocation ();
3457 /* Deduce size of array from initialization, if not already known */
3459 if (TREE_CODE (type
) == ARRAY_TYPE
3460 && TYPE_DOMAIN (type
) == 0
3461 && TREE_CODE (decl
) != TYPE_DECL
)
3464 = (TREE_STATIC (decl
)
3465 /* Even if pedantic, an external linkage array
3466 may have incomplete type at first. */
3467 ? pedantic
&& !TREE_PUBLIC (decl
)
3468 : !DECL_EXTERNAL (decl
));
3470 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3472 /* Get the completed type made by complete_array_type. */
3473 type
= TREE_TYPE (decl
);
3476 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3481 error_with_decl (decl
, "array size missing in `%s'");
3482 /* If a `static' var's size isn't known,
3483 make it extern as well as static, so it does not get
3485 If it is not `static', then do not mark extern;
3486 finish_incomplete_decl will give it a default size
3487 and it will get allocated. */
3488 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3489 DECL_EXTERNAL (decl
) = 1;
3492 /* TYPE_MAX_VALUE is always one less than the number of elements
3493 in the array, because we start counting at zero. Therefore,
3494 warn only if the value is less than zero. */
3495 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3496 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3497 error_with_decl (decl
, "zero or negative size array `%s'");
3499 layout_decl (decl
, 0);
3502 if (TREE_CODE (decl
) == VAR_DECL
)
3504 if (DECL_SIZE (decl
) == 0
3505 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3506 layout_decl (decl
, 0);
3508 if (DECL_SIZE (decl
) == 0
3509 && (TREE_STATIC (decl
)
3511 /* A static variable with an incomplete type
3512 is an error if it is initialized.
3513 Also if it is not file scope.
3514 Otherwise, let it through, but if it is not `extern'
3515 then it may cause an error message later. */
3516 (DECL_INITIAL (decl
) != 0
3517 || current_binding_level
!= global_binding_level
)
3519 /* An automatic variable with an incomplete type
3521 !DECL_EXTERNAL (decl
)))
3523 error_with_decl (decl
, "storage size of `%s' isn't known");
3524 TREE_TYPE (decl
) = error_mark_node
;
3527 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3528 && DECL_SIZE (decl
) != 0)
3530 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3531 constant_expression_warning (DECL_SIZE (decl
));
3533 error_with_decl (decl
, "storage size of `%s' isn't constant");
3537 /* If this is a function and an assembler name is specified, it isn't
3538 builtin any more. Also reset DECL_RTL so we can give it its new
3540 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3542 DECL_BUILT_IN (decl
) = 0;
3543 DECL_RTL (decl
) = 0;
3546 /* Output the assembler code and/or RTL code for variables and functions,
3547 unless the type is an undefined structure or union.
3548 If not, it will get done when the type is completed. */
3550 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3552 if (flag_traditional
&& allocation_temporary_p ())
3554 push_obstacks_nochange ();
3555 end_temporary_allocation ();
3556 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3557 maybe_objc_check_decl (decl
);
3558 rest_of_decl_compilation (decl
, asmspec
,
3559 current_binding_level
== global_binding_level
,
3565 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3566 maybe_objc_check_decl (decl
);
3567 rest_of_decl_compilation (decl
, asmspec
,
3568 current_binding_level
== global_binding_level
,
3571 if (current_binding_level
!= global_binding_level
)
3573 /* Recompute the RTL of a local array now
3574 if it used to be an incomplete type. */
3576 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3578 /* If we used it already as memory, it must stay in memory. */
3579 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3580 /* If it's still incomplete now, no init will save it. */
3581 if (DECL_SIZE (decl
) == 0)
3582 DECL_INITIAL (decl
) = 0;
3585 /* Compute and store the initial value. */
3586 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3587 expand_decl_init (decl
);
3591 if (TREE_CODE (decl
) == TYPE_DECL
)
3593 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3594 maybe_objc_check_decl (decl
);
3595 rest_of_decl_compilation (decl
, NULL_PTR
,
3596 current_binding_level
== global_binding_level
,
3600 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3601 /* This test used to include TREE_PERMANENT, however, we have the same
3602 problem with initializers at the function level. Such initializers get
3603 saved until the end of the function on the momentary_obstack. */
3604 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
3606 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3607 space with DECL_ARG_TYPE. */
3608 && TREE_CODE (decl
) != PARM_DECL
)
3610 /* We need to remember that this array HAD an initialization,
3611 but discard the actual temporary nodes,
3612 since we can't have a permanent node keep pointing to them. */
3613 /* We make an exception for inline functions, since it's
3614 normal for a local extern redeclaration of an inline function
3615 to have a copy of the top-level decl's DECL_INLINE. */
3616 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
3618 /* If this is a const variable, then preserve the
3619 initializer instead of discarding it so that we can optimize
3620 references to it. */
3621 /* This test used to include TREE_STATIC, but this won't be set
3622 for function level initializers. */
3623 if (TREE_READONLY (decl
))
3625 preserve_initializer ();
3626 /* Hack? Set the permanent bit for something that is permanent,
3627 but not on the permenent obstack, so as to convince
3628 output_constant_def to make its rtl on the permanent
3630 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
3632 /* The initializer and DECL must have the same (or equivalent
3633 types), but if the initializer is a STRING_CST, its type
3634 might not be on the right obstack, so copy the type
3636 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3639 DECL_INITIAL (decl
) = error_mark_node
;
3643 /* If requested, warn about definitions of large data objects. */
3645 if (warn_larger_than
3646 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
3647 && !DECL_EXTERNAL (decl
))
3649 register tree decl_size
= DECL_SIZE (decl
);
3651 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
3653 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
3655 if (units
> larger_than_size
)
3656 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
3661 /* Resume permanent allocation, if not within a function. */
3662 /* The corresponding push_obstacks_nochange is in start_decl,
3663 and in push_parm_decl and in grokfield. */
3667 /* If we have gone back from temporary to permanent allocation,
3668 actually free the temporary space that we no longer need. */
3669 if (temporary
&& !allocation_temporary_p ())
3670 permanent_allocation (0);
3672 /* At the end of a declaration, throw away any variable type sizes
3673 of types defined inside that declaration. There is no use
3674 computing them in the following function definition. */
3675 if (current_binding_level
== global_binding_level
)
3676 get_pending_sizes ();
3679 /* If DECL has a cleanup, build and return that cleanup here.
3680 This is a callback called by expand_expr. */
3683 maybe_build_cleanup (decl
)
3686 /* There are no cleanups in C. */
3690 /* Given a parsed parameter declaration,
3691 decode it into a PARM_DECL and push that on the current binding level.
3692 Also, for the sake of forward parm decls,
3693 record the given order of parms in `parm_order'. */
3696 push_parm_decl (parm
)
3700 int old_immediate_size_expand
= immediate_size_expand
;
3701 /* Don't try computing parm sizes now -- wait till fn is called. */
3702 immediate_size_expand
= 0;
3704 /* The corresponding pop_obstacks is in finish_decl. */
3705 push_obstacks_nochange ();
3707 decl
= grokdeclarator (TREE_VALUE (parm
), TREE_PURPOSE (parm
), PARM
, 0);
3710 if (DECL_NAME (decl
))
3713 olddecl
= lookup_name (DECL_NAME (decl
));
3714 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3715 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3719 decl
= pushdecl (decl
);
3721 immediate_size_expand
= old_immediate_size_expand
;
3723 current_binding_level
->parm_order
3724 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3726 /* Add this decl to the current binding level. */
3727 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3730 /* Clear the given order of parms in `parm_order'.
3731 Used at start of parm list,
3732 and also at semicolon terminating forward decls. */
3737 current_binding_level
->parm_order
= NULL_TREE
;
3740 /* Make TYPE a complete type based on INITIAL_VALUE.
3741 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3742 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3745 complete_array_type (type
, initial_value
, do_default
)
3750 register tree maxindex
= NULL_TREE
;
3755 /* Note MAXINDEX is really the maximum index,
3756 one less than the size. */
3757 if (TREE_CODE (initial_value
) == STRING_CST
)
3760 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3761 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3764 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3766 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3767 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
3768 for (; elts
; elts
= TREE_CHAIN (elts
))
3770 if (TREE_PURPOSE (elts
))
3771 maxindex
= TREE_PURPOSE (elts
);
3773 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
3775 maxindex
= copy_node (maxindex
);
3779 /* Make an error message unless that happened already. */
3780 if (initial_value
!= error_mark_node
)
3783 /* Prevent further error messages. */
3784 maxindex
= build_int_2 (0, 0);
3791 maxindex
= build_int_2 (0, 0);
3797 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3798 if (!TREE_TYPE (maxindex
))
3799 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3800 #if 0 /* I took out this change
3801 together with the change in build_array_type. --rms */
3802 change_main_variant (type
,
3803 build_array_type (TREE_TYPE (type
),
3804 TYPE_DOMAIN (type
)));
3808 /* Lay out the type now that we can get the real answer. */
3815 /* Given declspecs and a declarator,
3816 determine the name and type of the object declared
3817 and construct a ..._DECL node for it.
3818 (In one case we can return a ..._TYPE node instead.
3819 For invalid input we sometimes return 0.)
3821 DECLSPECS is a chain of tree_list nodes whose value fields
3822 are the storage classes and type specifiers.
3824 DECL_CONTEXT says which syntactic context this declaration is in:
3825 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3826 FUNCDEF for a function definition. Like NORMAL but a few different
3827 error messages in each case. Return value may be zero meaning
3828 this definition is too screwy to try to parse.
3829 PARM for a parameter declaration (either within a function prototype
3830 or before a function body). Make a PARM_DECL, or return void_type_node.
3831 TYPENAME if for a typename (in a cast or sizeof).
3832 Don't make a DECL node; just return the ..._TYPE node.
3833 FIELD for a struct or union field; make a FIELD_DECL.
3834 BITFIELD for a field with specified width.
3835 INITIALIZED is 1 if the decl has an initializer.
3837 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3838 It may also be so in the PARM case, for a prototype where the
3839 argument type is specified but not the name.
3841 This function is where the complicated C meanings of `static'
3842 and `extern' are interpreted. */
3845 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
3848 enum decl_context decl_context
;
3853 tree type
= NULL_TREE
;
3858 int explicit_int
= 0;
3859 int explicit_char
= 0;
3860 int defaulted_int
= 0;
3861 tree typedef_decl
= 0;
3863 tree typedef_type
= 0;
3864 int funcdef_flag
= 0;
3865 enum tree_code innermost_code
= ERROR_MARK
;
3867 int size_varies
= 0;
3869 if (decl_context
== BITFIELD
)
3870 bitfield
= 1, decl_context
= FIELD
;
3872 if (decl_context
== FUNCDEF
)
3873 funcdef_flag
= 1, decl_context
= NORMAL
;
3875 push_obstacks_nochange ();
3877 if (flag_traditional
&& allocation_temporary_p ())
3878 end_temporary_allocation ();
3880 /* Look inside a declarator for the name being declared
3881 and get it as a string, for an error message. */
3883 register tree decl
= declarator
;
3887 switch (TREE_CODE (decl
))
3892 innermost_code
= TREE_CODE (decl
);
3893 decl
= TREE_OPERAND (decl
, 0);
3896 case IDENTIFIER_NODE
:
3897 name
= IDENTIFIER_POINTER (decl
);
3908 /* A function definition's declarator must have the form of
3909 a function declarator. */
3911 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3914 /* Anything declared one level down from the top level
3915 must be one of the parameters of a function
3916 (because the body is at least two levels down). */
3918 /* If this looks like a function definition, make it one,
3919 even if it occurs where parms are expected.
3920 Then store_parm_decls will reject it and not use it as a parm. */
3921 if (decl_context
== NORMAL
&& !funcdef_flag
3922 && current_binding_level
->level_chain
== global_binding_level
)
3923 decl_context
= PARM
;
3925 /* Look through the decl specs and record which ones appear.
3926 Some typespecs are defined as built-in typenames.
3927 Others, the ones that are modifiers of other types,
3928 are represented by bits in SPECBITS: set the bits for
3929 the modifiers that appear. Storage class keywords are also in SPECBITS.
3931 If there is a typedef name or a type, store the type in TYPE.
3932 This includes builtin typedefs such as `int'.
3934 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3935 and did not come from a user typedef.
3937 Set LONGLONG if `long' is mentioned twice. */
3939 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3942 register tree id
= TREE_VALUE (spec
);
3944 if (id
== ridpointers
[(int) RID_INT
])
3946 if (id
== ridpointers
[(int) RID_CHAR
])
3949 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3950 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
3952 if (ridpointers
[i
] == id
)
3954 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
3957 error ("`long long long' is too long for GCC");
3960 if (pedantic
&& ! in_system_header
)
3961 pedwarn ("ANSI C does not support `long long'");
3965 else if (specbits
& (1 << i
))
3966 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3972 error ("two or more data types in declaration of `%s'", name
);
3973 /* Actual typedefs come to us as TYPE_DECL nodes. */
3974 else if (TREE_CODE (id
) == TYPE_DECL
)
3976 type
= TREE_TYPE (id
);
3979 /* Built-in types come as identifiers. */
3980 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3982 register tree t
= lookup_name (id
);
3983 if (TREE_TYPE (t
) == error_mark_node
)
3985 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3986 error ("`%s' fails to be a typedef or built in type",
3987 IDENTIFIER_POINTER (id
));
3990 type
= TREE_TYPE (t
);
3994 else if (TREE_CODE (id
) != ERROR_MARK
)
4000 typedef_type
= type
;
4002 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4004 /* No type at all: default to `int', and set DEFAULTED_INT
4005 because it was not a user-defined typedef. */
4009 if (funcdef_flag
&& warn_return_type
4010 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4011 | (1 << (int) RID_SIGNED
) | (1 << (int) RID_UNSIGNED
))))
4012 warn_about_return_type
= 1;
4014 type
= integer_type_node
;
4017 /* Now process the modifiers that were specified
4018 and check for invalid combinations. */
4020 /* Long double is a special combination. */
4022 if ((specbits
& 1 << (int) RID_LONG
)
4023 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4025 specbits
&= ~ (1 << (int) RID_LONG
);
4026 type
= long_double_type_node
;
4029 /* Check all other uses of type modifiers. */
4031 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4032 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4036 if (TREE_CODE (type
) != INTEGER_TYPE
)
4037 error ("long, short, signed or unsigned invalid for `%s'", name
);
4038 else if ((specbits
& 1 << (int) RID_LONG
)
4039 && (specbits
& 1 << (int) RID_SHORT
))
4040 error ("long and short specified together for `%s'", name
);
4041 else if (((specbits
& 1 << (int) RID_LONG
)
4042 || (specbits
& 1 << (int) RID_SHORT
))
4044 error ("long or short specified with char for `%s'", name
);
4045 else if (((specbits
& 1 << (int) RID_LONG
)
4046 || (specbits
& 1 << (int) RID_SHORT
))
4047 && TREE_CODE (type
) == REAL_TYPE
)
4048 error ("long or short specified with floating type for `%s'", name
);
4049 else if ((specbits
& 1 << (int) RID_SIGNED
)
4050 && (specbits
& 1 << (int) RID_UNSIGNED
))
4051 error ("signed and unsigned given together for `%s'", name
);
4055 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4057 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4059 if (flag_pedantic_errors
)
4064 /* Discard the type modifiers if they are invalid. */
4067 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4068 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4073 if ((specbits
& (1 << (int) RID_COMPLEX
))
4074 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4076 error ("complex invalid for `%s'", name
);
4077 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4080 /* Decide whether an integer type is signed or not.
4081 Optionally treat bitfields as signed by default. */
4082 if (specbits
& 1 << (int) RID_UNSIGNED
4083 /* Traditionally, all bitfields are unsigned. */
4084 || (bitfield
&& flag_traditional
4085 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4086 || (bitfield
&& ! flag_signed_bitfields
4087 && (explicit_int
|| defaulted_int
|| explicit_char
4088 /* A typedef for plain `int' without `signed'
4089 can be controlled just like plain `int'. */
4090 || ! (typedef_decl
!= 0
4091 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4092 && TREE_CODE (type
) != ENUMERAL_TYPE
4093 && !(specbits
& 1 << (int) RID_SIGNED
)))
4096 type
= long_long_unsigned_type_node
;
4097 else if (specbits
& 1 << (int) RID_LONG
)
4098 type
= long_unsigned_type_node
;
4099 else if (specbits
& 1 << (int) RID_SHORT
)
4100 type
= short_unsigned_type_node
;
4101 else if (type
== char_type_node
)
4102 type
= unsigned_char_type_node
;
4103 else if (typedef_decl
)
4104 type
= unsigned_type (type
);
4106 type
= unsigned_type_node
;
4108 else if ((specbits
& 1 << (int) RID_SIGNED
)
4109 && type
== char_type_node
)
4110 type
= signed_char_type_node
;
4112 type
= long_long_integer_type_node
;
4113 else if (specbits
& 1 << (int) RID_LONG
)
4114 type
= long_integer_type_node
;
4115 else if (specbits
& 1 << (int) RID_SHORT
)
4116 type
= short_integer_type_node
;
4118 if (specbits
& 1 << (int) RID_COMPLEX
)
4120 /* If we just have "complex", it is equivalent to
4121 "complex double", but if any modifiers at all are specified it is
4122 the complex form of TYPE. E.g, "complex short" is
4123 "complex short int". */
4125 if (defaulted_int
&& ! longlong
4126 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4127 | (1 << (int) RID_SIGNED
)
4128 | (1 << (int) RID_UNSIGNED
))))
4129 type
= complex_double_type_node
;
4130 else if (type
== integer_type_node
)
4131 type
= complex_integer_type_node
;
4132 else if (type
== float_type_node
)
4133 type
= complex_float_type_node
;
4134 else if (type
== double_type_node
)
4135 type
= complex_double_type_node
;
4136 else if (type
== long_double_type_node
)
4137 type
= complex_long_double_type_node
;
4139 type
= build_complex_type (type
);
4142 /* Set CONSTP if this declaration is `const', whether by
4143 explicit specification or via a typedef.
4144 Likewise for VOLATILEP. */
4146 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4147 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4148 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4150 pedwarn ("duplicate `const'");
4152 pedwarn ("duplicate `volatile'");
4153 if (! flag_gen_aux_info
&& (TYPE_READONLY (type
) || TYPE_VOLATILE (type
)))
4154 type
= TYPE_MAIN_VARIANT (type
);
4156 /* Warn if two storage classes are given. Default to `auto'. */
4161 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4162 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4163 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4164 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4165 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4166 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4168 /* Warn about storage classes that are invalid for certain
4169 kinds of declarations (parameters, typenames, etc.). */
4172 error ("multiple storage classes in declaration of `%s'", name
);
4173 else if (funcdef_flag
4175 & ((1 << (int) RID_REGISTER
)
4176 | (1 << (int) RID_AUTO
)
4177 | (1 << (int) RID_TYPEDEF
))))
4179 if (specbits
& 1 << (int) RID_AUTO
4180 && (pedantic
|| current_binding_level
== global_binding_level
))
4181 pedwarn ("function definition declared `auto'");
4182 if (specbits
& 1 << (int) RID_REGISTER
)
4183 error ("function definition declared `register'");
4184 if (specbits
& 1 << (int) RID_TYPEDEF
)
4185 error ("function definition declared `typedef'");
4186 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4187 | (1 << (int) RID_AUTO
));
4189 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4191 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4195 error ((decl_context
== FIELD
4196 ? "storage class specified for structure field `%s'"
4197 : (decl_context
== PARM
4198 ? "storage class specified for parameter `%s'"
4199 : "storage class specified for typename")),
4201 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4202 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4203 | (1 << (int) RID_EXTERN
));
4206 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4208 /* `extern' with initialization is invalid if not at top level. */
4209 if (current_binding_level
== global_binding_level
)
4210 warning ("`%s' initialized and declared `extern'", name
);
4212 error ("`%s' has both `extern' and initializer", name
);
4214 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4215 && current_binding_level
!= global_binding_level
)
4216 error ("nested function `%s' declared `extern'", name
);
4217 else if (current_binding_level
== global_binding_level
4218 && specbits
& (1 << (int) RID_AUTO
))
4219 error ("top-level declaration of `%s' specifies `auto'", name
);
4220 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4221 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4223 error ("iterator `%s' has derived type", name
);
4224 type
= error_mark_node
;
4226 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4227 && TREE_CODE (type
) != INTEGER_TYPE
)
4229 error ("iterator `%s' has noninteger type", name
);
4230 type
= error_mark_node
;
4234 /* Now figure out the structure of the declarator proper.
4235 Descend through it, creating more complex types, until we reach
4236 the declared identifier (or NULL_TREE, in an absolute declarator). */
4238 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4240 if (type
== error_mark_node
)
4242 declarator
= TREE_OPERAND (declarator
, 0);
4246 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4247 an INDIRECT_REF (for *...),
4248 a CALL_EXPR (for ...(...)),
4249 an identifier (for the name being declared)
4250 or a null pointer (for the place in an absolute declarator
4251 where the name was omitted).
4252 For the last two cases, we have just exited the loop.
4254 At this point, TYPE is the type of elements of an array,
4255 or for a function to return, or for a pointer to point to.
4256 After this sequence of ifs, TYPE is the type of the
4257 array or function or pointer, and DECLARATOR has had its
4258 outermost layer removed. */
4260 if (TREE_CODE (declarator
) == ARRAY_REF
)
4262 register tree itype
= NULL_TREE
;
4263 register tree size
= TREE_OPERAND (declarator
, 1);
4264 /* An uninitialized decl with `extern' is a reference. */
4265 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4266 /* The index is a signed object `sizetype' bits wide. */
4267 tree index_type
= signed_type (sizetype
);
4269 declarator
= TREE_OPERAND (declarator
, 0);
4271 /* Check for some types that there cannot be arrays of. */
4273 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4275 error ("declaration of `%s' as array of voids", name
);
4276 type
= error_mark_node
;
4279 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4281 error ("declaration of `%s' as array of functions", name
);
4282 type
= error_mark_node
;
4285 if (size
== error_mark_node
)
4286 type
= error_mark_node
;
4288 if (type
== error_mark_node
)
4291 /* If this is a block level extern, it must live past the end
4292 of the function so that we can check it against other extern
4293 declarations (IDENTIFIER_LIMBO_VALUE). */
4294 if (extern_ref
&& allocation_temporary_p ())
4295 end_temporary_allocation ();
4297 /* If size was specified, set ITYPE to a range-type for that size.
4298 Otherwise, ITYPE remains null. finish_decl may figure it out
4299 from an initial value. */
4303 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4304 STRIP_TYPE_NOPS (size
);
4306 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4307 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4309 error ("size of array `%s' has non-integer type", name
);
4310 size
= integer_one_node
;
4313 if (pedantic
&& integer_zerop (size
))
4314 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4316 if (TREE_CODE (size
) == INTEGER_CST
)
4318 constant_expression_warning (size
);
4319 if (tree_int_cst_sgn (size
) < 0)
4321 error ("size of array `%s' is negative", name
);
4322 size
= integer_one_node
;
4327 /* Make sure the array size remains visibly nonconstant
4328 even if it is (eg) a const variable with known value. */
4333 if (TREE_CONSTANT (size
))
4334 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4336 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4340 /* Convert size to index_type, so that if it is a variable
4341 the computations will be done in the proper mode. */
4342 itype
= fold (build (MINUS_EXPR
, index_type
,
4343 convert (index_type
, size
),
4344 convert (index_type
, size_one_node
)));
4347 itype
= variable_size (itype
);
4348 itype
= build_index_type (itype
);
4351 #if 0 /* This had bad results for pointers to arrays, as in
4352 union incomplete (*foo)[4]; */
4353 /* Complain about arrays of incomplete types, except in typedefs. */
4355 if (TYPE_SIZE (type
) == 0
4356 /* Avoid multiple warnings for nested array types. */
4357 && TREE_CODE (type
) != ARRAY_TYPE
4358 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4359 && !C_TYPE_BEING_DEFINED (type
))
4360 warning ("array type has incomplete element type");
4363 #if 0 /* We shouldn't have a function type here at all!
4364 Functions aren't allowed as array elements. */
4365 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4366 && (constp
|| volatilep
))
4367 pedwarn ("ANSI C forbids const or volatile function types");
4370 /* Build the array type itself, then merge any constancy or
4371 volatility into the target type. We must do it in this order
4372 to ensure that the TYPE_MAIN_VARIANT field of the array type
4373 is set correctly. */
4375 type
= build_array_type (type
, itype
);
4376 if (constp
|| volatilep
)
4377 type
= c_build_type_variant (type
, constp
, volatilep
);
4379 #if 0 /* don't clear these; leave them set so that the array type
4380 or the variable is itself const or volatile. */
4386 C_TYPE_VARIABLE_SIZE (type
) = 1;
4388 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4390 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4391 || current_binding_level
== global_binding_level
);
4394 /* Declaring a function type.
4395 Make sure we have a valid type for the function to return. */
4396 if (type
== error_mark_node
)
4401 /* Warn about some types functions can't return. */
4403 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4405 error ("`%s' declared as function returning a function", name
);
4406 type
= integer_type_node
;
4408 if (TREE_CODE (type
) == ARRAY_TYPE
)
4410 error ("`%s' declared as function returning an array", name
);
4411 type
= integer_type_node
;
4414 #ifndef TRADITIONAL_RETURN_FLOAT
4415 /* Traditionally, declaring return type float means double. */
4417 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4418 type
= double_type_node
;
4419 #endif /* TRADITIONAL_RETURN_FLOAT */
4421 /* If this is a block level extern, it must live past the end
4422 of the function so that we can check it against other extern
4423 declarations (IDENTIFIER_LIMBO_VALUE). */
4424 if (extern_ref
&& allocation_temporary_p ())
4425 end_temporary_allocation ();
4427 /* Construct the function type and go to the next
4428 inner layer of declarator. */
4430 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4432 /* Say it's a definition
4433 only for the CALL_EXPR
4434 closest to the identifier. */
4435 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4436 #if 0 /* This seems to be false. We turn off temporary allocation
4437 above in this function if -traditional.
4438 And this code caused inconsistent results with prototypes:
4439 callers would ignore them, and pass arguments wrong. */
4441 /* Omit the arg types if -traditional, since the arg types
4442 and the list links might not be permanent. */
4443 type
= build_function_type (type
,
4445 ? NULL_TREE
: arg_types
);
4447 /* ANSI seems to say that `const int foo ();'
4448 does not make the function foo const. */
4449 if (constp
|| volatilep
)
4450 type
= c_build_type_variant (type
, constp
, volatilep
);
4454 type
= build_function_type (type
, arg_types
);
4455 declarator
= TREE_OPERAND (declarator
, 0);
4457 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4458 the formal parameter list of this FUNCTION_TYPE to point to
4459 the FUNCTION_TYPE node itself. */
4464 for (link
= current_function_parm_tags
;
4466 link
= TREE_CHAIN (link
))
4467 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4470 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4472 /* Merge any constancy or volatility into the target type
4475 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4476 && (constp
|| volatilep
))
4477 pedwarn ("ANSI C forbids const or volatile function types");
4478 if (constp
|| volatilep
)
4479 type
= c_build_type_variant (type
, constp
, volatilep
);
4484 type
= build_pointer_type (type
);
4486 /* Process a list of type modifier keywords
4487 (such as const or volatile) that were given inside the `*'. */
4489 if (TREE_TYPE (declarator
))
4491 register tree typemodlist
;
4493 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4494 typemodlist
= TREE_CHAIN (typemodlist
))
4496 if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_CONST
])
4498 else if (TREE_VALUE (typemodlist
) == ridpointers
[(int) RID_VOLATILE
])
4503 error ("invalid type modifier within pointer declarator");
4507 pedwarn ("duplicate `const'");
4509 pedwarn ("duplicate `volatile'");
4512 declarator
= TREE_OPERAND (declarator
, 0);
4519 /* Now TYPE has the actual type. */
4521 /* If this is declaring a typedef name, return a TYPE_DECL. */
4523 if (specbits
& (1 << (int) RID_TYPEDEF
))
4526 /* Note that the grammar rejects storage classes
4527 in typenames, fields or parameters */
4528 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4529 && (constp
|| volatilep
))
4530 pedwarn ("ANSI C forbids const or volatile function types");
4531 if (constp
|| volatilep
)
4532 type
= c_build_type_variant (type
, constp
, volatilep
);
4534 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4535 if ((specbits
& (1 << (int) RID_SIGNED
))
4536 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4537 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4541 /* Detect the case of an array type of unspecified size
4542 which came, as such, direct from a typedef name.
4543 We must copy the type, so that each identifier gets
4544 a distinct type, so that each identifier's size can be
4545 controlled separately by its own initializer. */
4547 if (type
!= 0 && typedef_type
!= 0
4548 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4549 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4551 type
= build_array_type (TREE_TYPE (type
), 0);
4553 C_TYPE_VARIABLE_SIZE (type
) = 1;
4556 /* If this is a type name (such as, in a cast or sizeof),
4557 compute the type and return it now. */
4559 if (decl_context
== TYPENAME
)
4561 /* Note that the grammar rejects storage classes
4562 in typenames, fields or parameters */
4563 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4564 && (constp
|| volatilep
))
4565 pedwarn ("ANSI C forbids const or volatile function types");
4566 if (constp
|| volatilep
)
4567 type
= c_build_type_variant (type
, constp
, volatilep
);
4572 /* Aside from typedefs and type names (handle above),
4573 `void' at top level (not within pointer)
4574 is allowed only in public variables.
4575 We don't complain about parms either, but that is because
4576 a better error message can be made later. */
4578 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4579 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4580 && ((specbits
& (1 << (int) RID_EXTERN
))
4581 || (current_binding_level
== global_binding_level
4583 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4585 error ("variable or field `%s' declared void",
4586 IDENTIFIER_POINTER (declarator
));
4587 type
= integer_type_node
;
4590 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4591 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4596 if (decl_context
== PARM
)
4598 tree type_as_written
= type
;
4601 /* A parameter declared as an array of T is really a pointer to T.
4602 One declared as a function is really a pointer to a function. */
4604 if (TREE_CODE (type
) == ARRAY_TYPE
)
4606 /* Transfer const-ness of array into that of type pointed to. */
4607 type
= TREE_TYPE (type
);
4608 if (constp
|| volatilep
)
4609 type
= c_build_type_variant (type
, constp
, volatilep
);
4610 type
= build_pointer_type (type
);
4611 volatilep
= constp
= 0;
4614 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4616 if (pedantic
&& (constp
|| volatilep
))
4617 pedwarn ("ANSI C forbids const or volatile function types");
4618 if (constp
|| volatilep
)
4619 type
= c_build_type_variant (type
, constp
, volatilep
);
4620 type
= build_pointer_type (type
);
4621 volatilep
= constp
= 0;
4624 decl
= build_decl (PARM_DECL
, declarator
, type
);
4626 C_DECL_VARIABLE_SIZE (decl
) = 1;
4628 /* Compute the type actually passed in the parmlist,
4629 for the case where there is no prototype.
4630 (For example, shorts and chars are passed as ints.)
4631 When there is a prototype, this is overridden later. */
4633 DECL_ARG_TYPE (decl
) = type
;
4634 main_type
= (type
== error_mark_node
4636 : TYPE_MAIN_VARIANT (type
));
4637 if (main_type
== float_type_node
)
4638 DECL_ARG_TYPE (decl
) = double_type_node
;
4639 /* Don't use TYPE_PRECISION to decide whether to promote,
4640 because we should convert short if it's the same size as int,
4641 but we should not convert long if it's the same size as int. */
4642 else if (TREE_CODE (main_type
) != ERROR_MARK
4643 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
4645 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
4646 && TREE_UNSIGNED (type
))
4647 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
4649 DECL_ARG_TYPE (decl
) = integer_type_node
;
4652 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4654 else if (decl_context
== FIELD
)
4656 /* Structure field. It may not be a function. */
4658 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4660 error ("field `%s' declared as a function",
4661 IDENTIFIER_POINTER (declarator
));
4662 type
= build_pointer_type (type
);
4664 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
4666 error ("field `%s' has incomplete type",
4667 IDENTIFIER_POINTER (declarator
));
4668 type
= error_mark_node
;
4670 /* Move type qualifiers down to element of an array. */
4671 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4673 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4675 TYPE_DOMAIN (type
));
4676 #if 0 /* Leave the field const or volatile as well. */
4677 constp
= volatilep
= 0;
4680 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4682 C_DECL_VARIABLE_SIZE (decl
) = 1;
4684 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4686 /* Every function declaration is "external"
4687 except for those which are inside a function body
4688 in which `auto' is used.
4689 That is a case not specified by ANSI C,
4690 and we use it for forward declarations for nested functions. */
4691 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4692 || current_binding_level
== global_binding_level
);
4694 if (specbits
& (1 << (int) RID_AUTO
)
4695 && (pedantic
|| current_binding_level
== global_binding_level
))
4696 pedwarn ("invalid storage class for function `%s'",
4697 IDENTIFIER_POINTER (declarator
));
4698 if (specbits
& (1 << (int) RID_REGISTER
))
4699 error ("invalid storage class for function `%s'",
4700 IDENTIFIER_POINTER (declarator
));
4701 /* Function declaration not at top level.
4702 Storage classes other than `extern' are not allowed
4703 and `extern' makes no difference. */
4704 if (current_binding_level
!= global_binding_level
4705 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4707 pedwarn ("invalid storage class for function `%s'",
4708 IDENTIFIER_POINTER (declarator
));
4710 /* If this is a block level extern, it must live past the end
4711 of the function so that we can check it against other
4712 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4713 if (extern_ref
&& allocation_temporary_p ())
4714 end_temporary_allocation ();
4716 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4718 if (pedantic
&& (constp
|| volatilep
)
4719 && ! DECL_IN_SYSTEM_HEADER (decl
))
4720 pedwarn ("ANSI C forbids const or volatile functions");
4723 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
4724 warning ("`noreturn' function returns non-void value");
4727 DECL_EXTERNAL (decl
) = 1;
4728 /* Record absence of global scope for `static' or `auto'. */
4730 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4731 /* Record presence of `inline', if it is reasonable. */
4734 tree last
= tree_last (TYPE_ARG_TYPES (type
));
4736 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4737 warning ("cannot inline function `main'");
4738 else if (last
&& (TYPE_MAIN_VARIANT (TREE_VALUE (last
))
4740 warning ("inline declaration ignored for function with `...'");
4742 /* Assume that otherwise the function can be inlined. */
4743 DECL_INLINE (decl
) = 1;
4745 if (specbits
& (1 << (int) RID_EXTERN
))
4746 current_extern_inline
= 1;
4751 /* It's a variable. */
4752 /* An uninitialized decl with `extern' is a reference. */
4753 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4755 /* Move type qualifiers down to element of an array. */
4756 if (TREE_CODE (type
) == ARRAY_TYPE
&& (constp
|| volatilep
))
4758 type
= build_array_type (c_build_type_variant (TREE_TYPE (type
),
4760 TYPE_DOMAIN (type
));
4761 #if 0 /* Leave the variable const or volatile as well. */
4762 constp
= volatilep
= 0;
4766 /* If this is a block level extern, it must live past the end
4767 of the function so that we can check it against other
4768 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4769 if (extern_ref
&& allocation_temporary_p ())
4770 end_temporary_allocation ();
4772 decl
= build_decl (VAR_DECL
, declarator
, type
);
4774 C_DECL_VARIABLE_SIZE (decl
) = 1;
4777 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
4779 DECL_EXTERNAL (decl
) = extern_ref
;
4780 /* At top level, the presence of a `static' or `register' storage
4781 class specifier, or the absence of all storage class specifiers
4782 makes this declaration a definition (perhaps tentative). Also,
4783 the absence of both `static' and `register' makes it public. */
4784 if (current_binding_level
== global_binding_level
)
4788 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
4789 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
4791 /* Not at top level, only `static' makes a static definition. */
4794 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4795 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
4798 if (specbits
& 1 << (int) RID_ITERATOR
)
4799 ITERATOR_P (decl
) = 1;
4802 /* Record `register' declaration for warnings on &
4803 and in case doing stupid register allocation. */
4805 if (specbits
& (1 << (int) RID_REGISTER
))
4806 DECL_REGISTER (decl
) = 1;
4808 /* Record constancy and volatility. */
4811 TREE_READONLY (decl
) = 1;
4814 TREE_SIDE_EFFECTS (decl
) = 1;
4815 TREE_THIS_VOLATILE (decl
) = 1;
4817 /* If a type has volatile components, it should be stored in memory.
4818 Otherwise, the fact that those components are volatile
4819 will be ignored, and would even crash the compiler. */
4820 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4821 mark_addressable (decl
);
4829 /* Decode the parameter-list info for a function type or function definition.
4830 The argument is the value returned by `get_parm_info' (or made in parse.y
4831 if there is an identifier list instead of a parameter decl list).
4832 These two functions are separate because when a function returns
4833 or receives functions then each is called multiple times but the order
4834 of calls is different. The last call to `grokparms' is always the one
4835 that contains the formal parameter names of a function definition.
4837 Store in `last_function_parms' a chain of the decls of parms.
4838 Also store in `last_function_parm_tags' a chain of the struct, union,
4839 and enum tags declared among the parms.
4841 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4843 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4844 a mere declaration. A nonempty identifier-list gets an error message
4845 when FUNCDEF_FLAG is zero. */
4848 grokparms (parms_info
, funcdef_flag
)
4852 tree first_parm
= TREE_CHAIN (parms_info
);
4854 last_function_parms
= TREE_PURPOSE (parms_info
);
4855 last_function_parm_tags
= TREE_VALUE (parms_info
);
4857 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4858 && !in_system_header
)
4859 warning ("function declaration isn't a prototype");
4862 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4865 pedwarn ("parameter names (without types) in function declaration");
4867 last_function_parms
= first_parm
;
4874 /* We no longer test FUNCDEF_FLAG.
4875 If the arg types are incomplete in a declaration,
4876 they must include undefined tags.
4877 These tags can never be defined in the scope of the declaration,
4878 so the types can never be completed,
4879 and no call can be compiled successfully. */
4881 /* In a fcn definition, arg types must be complete. */
4884 for (parm
= last_function_parms
, typelt
= first_parm
;
4886 parm
= TREE_CHAIN (parm
))
4887 /* Skip over any enumeration constants declared here. */
4888 if (TREE_CODE (parm
) == PARM_DECL
)
4890 /* Barf if the parameter itself has an incomplete type. */
4891 tree type
= TREE_VALUE (typelt
);
4892 if (TYPE_SIZE (type
) == 0)
4894 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4895 error ("parameter `%s' has incomplete type",
4896 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4898 warning ("parameter has incomplete type");
4901 TREE_VALUE (typelt
) = error_mark_node
;
4902 TREE_TYPE (parm
) = error_mark_node
;
4905 #if 0 /* This has been replaced by parm_tags_warning
4906 which uses a more accurate criterion for what to warn about. */
4909 /* Now warn if is a pointer to an incomplete type. */
4910 while (TREE_CODE (type
) == POINTER_TYPE
4911 || TREE_CODE (type
) == REFERENCE_TYPE
)
4912 type
= TREE_TYPE (type
);
4913 type
= TYPE_MAIN_VARIANT (type
);
4914 if (TYPE_SIZE (type
) == 0)
4916 if (DECL_NAME (parm
) != 0)
4917 warning ("parameter `%s' points to incomplete type",
4918 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4920 warning ("parameter points to incomplete type");
4924 typelt
= TREE_CHAIN (typelt
);
4927 /* Allocate the list of types the way we allocate a type. */
4928 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
4930 /* Construct a copy of the list of types
4931 on the saveable obstack. */
4933 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
4934 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
4936 return nreverse (result
);
4939 /* The list we have is permanent already. */
4945 /* Return a tree_list node with info on a parameter list just parsed.
4946 The TREE_PURPOSE is a chain of decls of those parms.
4947 The TREE_VALUE is a list of structure, union and enum tags defined.
4948 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4949 This tree_list node is later fed to `grokparms'.
4951 VOID_AT_END nonzero means append `void' to the end of the type-list.
4952 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4955 get_parm_info (void_at_end
)
4958 register tree decl
, t
;
4959 register tree types
= 0;
4961 tree tags
= gettags ();
4962 tree parms
= getdecls ();
4964 tree order
= current_binding_level
->parm_order
;
4966 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4967 if (void_at_end
&& parms
!= 0
4968 && TREE_CHAIN (parms
) == 0
4969 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
4970 && DECL_NAME (parms
) == 0)
4973 storedecls (NULL_TREE
);
4974 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
4975 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
4978 /* Extract enumerator values and other non-parms declared with the parms.
4979 Likewise any forward parm decls that didn't have real parm decls. */
4980 for (decl
= parms
; decl
; )
4982 tree next
= TREE_CHAIN (decl
);
4984 if (TREE_CODE (decl
) != PARM_DECL
)
4986 TREE_CHAIN (decl
) = new_parms
;
4989 else if (TREE_ASM_WRITTEN (decl
))
4991 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
4992 TREE_CHAIN (decl
) = new_parms
;
4998 /* Put the parm decls back in the order they were in in the parm list. */
4999 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5002 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5004 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5007 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5010 /* Store the parmlist in the binding level since the old one
5011 is no longer a valid list. (We have changed the chain pointers.) */
5012 storedecls (new_parms
);
5014 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5015 /* There may also be declarations for enumerators if an enumeration
5016 type is declared among the parms. Ignore them here. */
5017 if (TREE_CODE (decl
) == PARM_DECL
)
5019 /* Since there is a prototype,
5020 args are passed in their declared types. */
5021 tree type
= TREE_TYPE (decl
);
5022 DECL_ARG_TYPE (decl
) = type
;
5023 #ifdef PROMOTE_PROTOTYPES
5024 if ((TREE_CODE (type
) == INTEGER_TYPE
5025 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5026 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5027 DECL_ARG_TYPE (decl
) = integer_type_node
;
5030 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5031 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5032 && DECL_NAME (decl
) == 0)
5034 error ("`void' in parameter list must be the entire list");
5040 return saveable_tree_cons (new_parms
, tags
,
5041 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5043 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5046 /* At end of parameter list, warn about any struct, union or enum tags
5047 defined within. Do so because these types cannot ever become complete. */
5050 parmlist_tags_warning ()
5055 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5057 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5058 /* An anonymous union parm type is meaningful as a GNU extension.
5059 So don't warn for that. */
5060 if (code
== UNION_TYPE
&& !pedantic
)
5062 if (TREE_PURPOSE (elt
) != 0)
5063 warning ("`%s %s' declared inside parameter list",
5064 (code
== RECORD_TYPE
? "struct"
5065 : code
== UNION_TYPE
? "union"
5067 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5069 warning ("anonymous %s declared inside parameter list",
5070 (code
== RECORD_TYPE
? "struct"
5071 : code
== UNION_TYPE
? "union"
5076 warning ("its scope is only this definition or declaration,");
5077 warning ("which is probably not what you want.");
5083 /* Get the struct, enum or union (CODE says which) with tag NAME.
5084 Define the tag as a forward-reference if it is not defined. */
5087 xref_tag (code
, name
)
5088 enum tree_code code
;
5091 int temporary
= allocation_temporary_p ();
5093 /* If a cross reference is requested, look up the type
5094 already defined for this tag and return it. */
5096 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5097 /* Even if this is the wrong type of tag, return what we found.
5098 There will be an error message anyway, from pending_xref_error.
5099 If we create an empty xref just for an invalid use of the type,
5100 the main result is to create lots of superfluous error messages. */
5104 push_obstacks_nochange ();
5106 if (current_binding_level
== global_binding_level
&& temporary
)
5107 end_temporary_allocation ();
5109 /* If no such tag is yet defined, create a forward-reference node
5110 and record it as the "definition".
5111 When a real declaration of this type is found,
5112 the forward-reference will be altered into a real type. */
5114 ref
= make_node (code
);
5115 if (code
== ENUMERAL_TYPE
)
5117 /* (In ANSI, Enums can be referred to only if already defined.) */
5119 pedwarn ("ANSI C forbids forward references to `enum' types");
5120 /* Give the type a default layout like unsigned int
5121 to avoid crashing if it does not get defined. */
5122 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5123 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5124 TREE_UNSIGNED (ref
) = 1;
5125 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5126 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5127 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5130 pushtag (name
, ref
);
5137 /* Make sure that the tag NAME is defined *in the current binding level*
5138 at least as a forward reference.
5139 CODE says which kind of tag NAME ought to be.
5141 We also do a push_obstacks_nochange
5142 whose matching pop is in finish_struct. */
5145 start_struct (code
, name
)
5146 enum tree_code code
;
5149 /* If there is already a tag defined at this binding level
5150 (as a forward reference), just return it. */
5152 register tree ref
= 0;
5154 push_obstacks_nochange ();
5155 if (current_binding_level
== global_binding_level
)
5156 end_temporary_allocation ();
5159 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5160 if (ref
&& TREE_CODE (ref
) == code
)
5162 C_TYPE_BEING_DEFINED (ref
) = 1;
5163 if (TYPE_FIELDS (ref
))
5164 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5165 : "redefinition of `struct %s'"),
5166 IDENTIFIER_POINTER (name
));
5171 /* Otherwise create a forward-reference just so the tag is in scope. */
5173 ref
= make_node (code
);
5174 pushtag (name
, ref
);
5175 C_TYPE_BEING_DEFINED (ref
) = 1;
5179 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5180 of a structure component, returning a FIELD_DECL node.
5181 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5183 This is done during the parsing of the struct declaration.
5184 The FIELD_DECL nodes are chained together and the lot of them
5185 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5188 grokfield (filename
, line
, declarator
, declspecs
, width
)
5191 tree declarator
, declspecs
, width
;
5195 /* The corresponding pop_obstacks is in finish_decl. */
5196 push_obstacks_nochange ();
5198 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5200 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5201 DECL_INITIAL (value
) = width
;
5203 maybe_objc_check_decl (value
);
5207 /* Function to help qsort sort FIELD_DECLs by name order. */
5210 field_decl_cmp (x
, y
)
5213 return (long)DECL_NAME (*x
) - (long)DECL_NAME (*y
);
5216 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5217 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5219 We also do a pop_obstacks to match the push in start_struct. */
5222 finish_struct (t
, fieldlist
)
5223 register tree t
, fieldlist
;
5227 int toplevel
= global_binding_level
== current_binding_level
;
5229 /* If this type was previously laid out as a forward reference,
5230 make sure we lay it out again. */
5234 /* Nameless union parm types are useful as GCC extension. */
5235 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5236 /* Otherwise, warn about any struct or union def. in parmlist. */
5237 if (in_parm_level_p ())
5240 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5241 : "structure defined inside parms"));
5242 else if (! flag_traditional
)
5243 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5244 : "structure defined inside parms"));
5247 old_momentary
= suspend_momentary ();
5249 if (fieldlist
== 0 && pedantic
)
5250 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union has no members"
5251 : "structure has no members"));
5253 /* Install struct as DECL_CONTEXT of each field decl.
5254 Also process specified field sizes.
5255 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5256 The specified size is found in the DECL_INITIAL.
5257 Store 0 there, except for ": 0" fields (so we can find them
5258 and delete them, below). */
5260 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5262 DECL_CONTEXT (x
) = t
;
5263 DECL_FIELD_SIZE (x
) = 0;
5265 /* If any field is const, the structure type is pseudo-const. */
5266 if (TREE_READONLY (x
))
5267 C_TYPE_FIELDS_READONLY (t
) = 1;
5270 /* A field that is pseudo-const makes the structure likewise. */
5271 tree t1
= TREE_TYPE (x
);
5272 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5273 t1
= TREE_TYPE (t1
);
5274 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5275 && C_TYPE_FIELDS_READONLY (t1
))
5276 C_TYPE_FIELDS_READONLY (t
) = 1;
5279 /* Any field that is volatile means variables of this type must be
5280 treated in some ways as volatile. */
5281 if (TREE_THIS_VOLATILE (x
))
5282 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5284 /* Any field of nominal variable size implies structure is too. */
5285 if (C_DECL_VARIABLE_SIZE (x
))
5286 C_TYPE_VARIABLE_SIZE (t
) = 1;
5288 /* Detect invalid nested redefinition. */
5289 if (TREE_TYPE (x
) == t
)
5290 error ("nested redefinition of `%s'",
5291 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5293 /* Detect invalid bit-field size. */
5294 if (DECL_INITIAL (x
))
5295 STRIP_NOPS (DECL_INITIAL (x
));
5296 if (DECL_INITIAL (x
))
5298 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5299 constant_expression_warning (DECL_INITIAL (x
));
5302 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5303 DECL_INITIAL (x
) = NULL
;
5307 /* Detect invalid bit-field type. */
5308 if (DECL_INITIAL (x
)
5309 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5310 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5312 error_with_decl (x
, "bit-field `%s' has invalid type");
5313 DECL_INITIAL (x
) = NULL
;
5315 if (DECL_INITIAL (x
) && pedantic
5316 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5317 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5318 /* Accept an enum that's equivalent to int or unsigned int. */
5319 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5320 && (TYPE_PRECISION (TREE_TYPE (x
))
5321 == TYPE_PRECISION (integer_type_node
))))
5322 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5324 /* Detect and ignore out of range field width. */
5325 if (DECL_INITIAL (x
))
5327 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5329 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5331 DECL_INITIAL (x
) = NULL
;
5332 error_with_decl (x
, "negative width in bit-field `%s'");
5334 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5335 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5337 DECL_INITIAL (x
) = NULL
;
5338 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5340 else if (width
== 0 && DECL_NAME (x
) != 0)
5342 error_with_decl (x
, "zero width for bit-field `%s'");
5343 DECL_INITIAL (x
) = NULL
;
5347 /* Process valid field width. */
5348 if (DECL_INITIAL (x
))
5350 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5352 DECL_FIELD_SIZE (x
) = width
;
5353 DECL_BIT_FIELD (x
) = 1;
5354 DECL_INITIAL (x
) = NULL
;
5358 /* field size 0 => force desired amount of alignment. */
5359 #ifdef EMPTY_FIELD_BOUNDARY
5360 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5362 #ifdef PCC_BITFIELD_TYPE_MATTERS
5363 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5364 TYPE_ALIGN (TREE_TYPE (x
)));
5370 int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5371 : TYPE_ALIGN (TREE_TYPE (x
)));
5372 /* Non-bit-fields are aligned for their type, except packed
5373 fields which require only BITS_PER_UNIT alignment. */
5374 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5378 /* Now DECL_INITIAL is null on all members. */
5380 /* Delete all duplicate fields from the fieldlist */
5381 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5382 /* Anonymous fields aren't duplicates. */
5383 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5387 register tree y
= fieldlist
;
5391 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5397 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5399 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5400 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5402 else x
= TREE_CHAIN (x
);
5405 /* Now we have the nearly final fieldlist. Record it,
5406 then lay out the structure or union (including the fields). */
5408 TYPE_FIELDS (t
) = fieldlist
;
5412 /* Delete all zero-width bit-fields from the front of the fieldlist */
5414 && DECL_INITIAL (fieldlist
))
5415 fieldlist
= TREE_CHAIN (fieldlist
);
5416 /* Delete all such members from the rest of the fieldlist */
5417 for (x
= fieldlist
; x
;)
5419 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5420 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5421 else x
= TREE_CHAIN (x
);
5424 /* Now we have the truly final field list.
5425 Store it in this type and in the variants. */
5427 TYPE_FIELDS (t
) = fieldlist
;
5429 /* If there are lots of fields, sort so we can look through them fast.
5430 We arbitrarily consider 16 or more elts to be "a lot". */
5434 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5445 len
+= list_length (x
);
5446 /* Use the same allocation policy here that make_node uses, to
5447 ensure that this lives as long as the rest of the struct decl.
5448 All decls in an inline function need to be saved. */
5449 if (allocation_temporary_p ())
5450 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5452 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5454 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5455 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5457 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5459 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5460 field_array
[len
++] = x
;
5462 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5466 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5468 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5469 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5470 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5473 /* Promote each bit-field's type to int if it is narrower than that. */
5474 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5475 if (DECL_BIT_FIELD (x
)
5476 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x
))
5477 || DECL_FIELD_SIZE (x
) < TYPE_PRECISION (integer_type_node
)))
5479 tree type
= TREE_TYPE (x
);
5481 /* Preserve unsignedness if traditional
5482 or if not really getting any wider. */
5483 if (TREE_UNSIGNED (type
)
5484 && (flag_traditional
5486 (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
5488 DECL_FIELD_SIZE (x
) == TYPE_PRECISION (integer_type_node
))))
5489 TREE_TYPE (x
) = unsigned_type_node
;
5491 TREE_TYPE (x
) = integer_type_node
;
5494 /* If this structure or union completes the type of any previous
5495 variable declaration, lay it out and output its rtl. */
5497 if (current_binding_level
->n_incomplete
!= 0)
5500 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5502 if (TREE_TYPE (decl
) == t
5503 && TREE_CODE (decl
) != TYPE_DECL
)
5505 layout_decl (decl
, 0);
5506 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5507 maybe_objc_check_decl (decl
);
5508 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5511 --current_binding_level
->n_incomplete
;
5513 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5514 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5516 tree element
= TREE_TYPE (decl
);
5517 while (TREE_CODE (element
) == ARRAY_TYPE
)
5518 element
= TREE_TYPE (element
);
5520 layout_array_type (TREE_TYPE (decl
));
5525 resume_momentary (old_momentary
);
5527 /* Finish debugging output for this type. */
5528 rest_of_type_compilation (t
, toplevel
);
5530 /* The matching push is in start_struct. */
5536 /* Lay out the type T, and its element type, and so on. */
5539 layout_array_type (t
)
5542 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5543 layout_array_type (TREE_TYPE (t
));
5547 /* Begin compiling the definition of an enumeration type.
5548 NAME is its name (or null if anonymous).
5549 Returns the type object, as yet incomplete.
5550 Also records info about it so that build_enumerator
5551 may be used to declare the individual values as they are read. */
5557 register tree enumtype
= 0;
5559 /* If this is the real definition for a previous forward reference,
5560 fill in the contents in the same object that used to be the
5561 forward reference. */
5564 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5566 /* The corresponding pop_obstacks is in finish_enum. */
5567 push_obstacks_nochange ();
5568 /* If these symbols and types are global, make them permanent. */
5569 if (current_binding_level
== global_binding_level
)
5570 end_temporary_allocation ();
5572 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5574 enumtype
= make_node (ENUMERAL_TYPE
);
5575 pushtag (name
, enumtype
);
5578 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5580 if (TYPE_VALUES (enumtype
) != 0)
5582 /* This enum is a named one that has been declared already. */
5583 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5585 /* Completely replace its old definition.
5586 The old enumerators remain defined, however. */
5587 TYPE_VALUES (enumtype
) = 0;
5590 enum_next_value
= integer_zero_node
;
5596 /* After processing and defining all the values of an enumeration type,
5597 install their decls in the enumeration type and finish it off.
5598 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5599 Returns ENUMTYPE. */
5602 finish_enum (enumtype
, values
)
5603 register tree enumtype
, values
;
5605 register tree pair
, tem
;
5606 tree minnode
= 0, maxnode
= 0;
5607 register HOST_WIDE_INT maxvalue
= 0;
5608 register HOST_WIDE_INT minvalue
= 0;
5609 unsigned precision
= 0;
5610 int toplevel
= global_binding_level
== current_binding_level
;
5612 if (in_parm_level_p ())
5613 warning ("enum defined inside parms");
5615 /* Calculate the maximum value of any enumerator in this type. */
5617 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5619 tree value
= TREE_VALUE (pair
);
5621 minnode
= maxnode
= TREE_VALUE (pair
);
5624 if (tree_int_cst_lt (maxnode
, value
))
5626 if (tree_int_cst_lt (value
, minnode
))
5631 TYPE_MIN_VALUE (enumtype
) = minnode
;
5632 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5634 /* Determine the precision this type needs. */
5636 if (TREE_INT_CST_HIGH (minnode
) >= 0
5637 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node
), maxnode
)
5638 : (tree_int_cst_lt (minnode
, TYPE_MIN_VALUE (integer_type_node
))
5639 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node
), maxnode
)))
5640 precision
= TYPE_PRECISION (long_long_integer_type_node
);
5643 maxvalue
= TREE_INT_CST_LOW (maxnode
);
5644 minvalue
= TREE_INT_CST_LOW (minnode
);
5647 precision
= floor_log2 (maxvalue
) + 1;
5650 /* Compute number of bits to represent magnitude of a negative value.
5651 Add one to MINVALUE since range of negative numbers
5652 includes the power of two. */
5653 unsigned negprecision
= floor_log2 (-minvalue
- 1) + 1;
5654 if (negprecision
> precision
)
5655 precision
= negprecision
;
5656 precision
+= 1; /* room for sign bit */
5663 if (flag_short_enums
|| precision
> TYPE_PRECISION (integer_type_node
))
5664 /* Use the width of the narrowest normal C type which is wide enough. */
5665 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (type_for_size (precision
, 1));
5667 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
5669 TYPE_SIZE (enumtype
) = 0;
5670 layout_type (enumtype
);
5672 /* An enum can have some negative values; then it is signed. */
5673 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
5675 /* Change the type of the enumerators to be the enum type.
5676 Formerly this was done only for enums that fit in an int,
5677 but the comment said it was done only for enums wider than int.
5678 It seems necessary to do this for wide enums,
5679 and best not to change what's done for ordinary narrower ones. */
5680 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5682 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
5683 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
5684 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
5685 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
5688 /* Replace the decl nodes in VALUES with their names. */
5689 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5690 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
5692 TYPE_VALUES (enumtype
) = values
;
5694 /* Fix up all variant types of this enum type. */
5695 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5697 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5698 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5699 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5700 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5701 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5702 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5703 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5704 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5707 /* Finish debugging output for this type. */
5708 rest_of_type_compilation (enumtype
, toplevel
);
5710 /* This matches a push in start_enum. */
5716 /* Build and install a CONST_DECL for one value of the
5717 current enumeration type (one that was begun with start_enum).
5718 Return a tree-list containing the CONST_DECL and its value.
5719 Assignment of sequential values by default is handled here. */
5722 build_enumerator (name
, value
)
5725 register tree decl
, type
;
5727 /* Validate and default VALUE. */
5729 /* Remove no-op casts from the value. */
5731 STRIP_TYPE_NOPS (value
);
5735 if (TREE_CODE (value
) == INTEGER_CST
)
5737 value
= default_conversion (value
);
5738 constant_expression_warning (value
);
5742 error ("enumerator value for `%s' not integer constant",
5743 IDENTIFIER_POINTER (name
));
5748 /* Default based on previous value. */
5749 /* It should no longer be possible to have NON_LVALUE_EXPR
5753 value
= enum_next_value
;
5755 error ("overflow in enumeration values");
5758 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5760 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5761 value
= integer_zero_node
;
5764 /* Set basis for default for next value. */
5765 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5766 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5768 /* Now create a declaration for the enum value name. */
5770 type
= TREE_TYPE (value
);
5771 type
= type_for_size (MAX (TYPE_PRECISION (type
),
5772 TYPE_PRECISION (integer_type_node
)),
5774 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
5775 && TREE_UNSIGNED (type
)));
5777 decl
= build_decl (CONST_DECL
, name
, type
);
5778 DECL_INITIAL (decl
) = value
;
5779 TREE_TYPE (value
) = type
;
5782 return saveable_tree_cons (decl
, value
, NULL_TREE
);
5785 /* Create the FUNCTION_DECL for a function definition.
5786 DECLSPECS and DECLARATOR are the parts of the declaration;
5787 they describe the function's name and the type it returns,
5788 but twisted together in a fashion that parallels the syntax of C.
5790 This function creates a binding context for the function body
5791 as well as setting up the FUNCTION_DECL in current_function_decl.
5793 Returns 1 on success. If the DECLARATOR is not suitable for a function
5794 (it defines a datum instead), we return 0, which tells
5795 yyparse to report a parse error.
5797 NESTED is nonzero for a function nested within another function. */
5800 start_function (declspecs
, declarator
, nested
)
5801 tree declarator
, declspecs
;
5804 tree decl1
, old_decl
;
5807 current_function_returns_value
= 0; /* Assume, until we see it does. */
5808 current_function_returns_null
= 0;
5809 warn_about_return_type
= 0;
5810 current_extern_inline
= 0;
5811 c_function_varargs
= 0;
5813 shadowed_labels
= 0;
5815 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5817 /* If the declarator is not suitable for a function definition,
5818 cause a syntax error. */
5822 announce_function (decl1
);
5824 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
5826 error ("return-type is an incomplete type");
5827 /* Make it return void instead. */
5829 = build_function_type (void_type_node
,
5830 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5833 if (warn_about_return_type
)
5834 warning ("return-type defaults to `int'");
5836 /* Save the parm names or decls from this function's declarator
5837 where store_parm_decls will find them. */
5838 current_function_parms
= last_function_parms
;
5839 current_function_parm_tags
= last_function_parm_tags
;
5841 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5842 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5843 DECL_INITIAL (decl1
) = error_mark_node
;
5845 /* If this definition isn't a prototype and we had a prototype declaration
5846 before, copy the arg type info from that prototype.
5847 But not if what we had before was a builtin function. */
5848 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5849 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5850 && !DECL_BUILT_IN (old_decl
)
5851 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5852 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5853 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5855 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5856 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
5857 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
5860 /* Optionally warn of old-fashioned def with no previous prototype. */
5861 if (warn_strict_prototypes
5862 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5863 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5864 warning ("function declaration isn't a prototype");
5865 /* Optionally warn of any global def with no previous prototype. */
5866 else if (warn_missing_prototypes
5867 && TREE_PUBLIC (decl1
)
5868 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
5869 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5870 warning_with_decl (decl1
, "no previous prototype for `%s'");
5871 /* Optionally warn of any def with no previous prototype
5872 if the function has already been used. */
5873 else if (warn_missing_prototypes
5874 && old_decl
!= 0 && TREE_USED (old_decl
)
5875 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
5876 warning_with_decl (decl1
,
5877 "`%s' was used with no prototype before its definition");
5878 /* Optionally warn of any global def with no previous declaration. */
5879 else if (warn_missing_declarations
5880 && TREE_PUBLIC (decl1
)
5882 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
5883 warning_with_decl (decl1
, "no previous declaration for `%s'");
5884 /* Optionally warn of any def with no previous declaration
5885 if the function has already been used. */
5886 else if (warn_missing_declarations
5887 && old_decl
!= 0 && TREE_USED (old_decl
))
5888 warning_with_decl (decl1
,
5889 "`%s' was used with no declaration before its definition");
5891 /* This is a definition, not a reference.
5892 So normally clear DECL_EXTERNAL.
5893 However, `extern inline' acts like a declaration
5894 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5895 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5897 /* This function exists in static storage.
5898 (This does not mean `static' in the C sense!) */
5899 TREE_STATIC (decl1
) = 1;
5901 /* A nested function is not global. */
5902 if (current_function_decl
!= 0)
5903 TREE_PUBLIC (decl1
) = 0;
5905 /* Record the decl so that the function name is defined.
5906 If we already have a decl for this name, and it is a FUNCTION_DECL,
5907 use the old decl. */
5909 current_function_decl
= pushdecl (decl1
);
5912 declare_parm_level (1);
5913 current_binding_level
->subblocks_tag_transparent
= 1;
5915 make_function_rtl (current_function_decl
);
5917 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5918 /* Promote the value to int before returning it. */
5919 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
5921 /* It retains unsignedness if traditional
5922 or if not really getting wider. */
5923 if (TREE_UNSIGNED (restype
)
5924 && (flag_traditional
5925 || (TYPE_PRECISION (restype
)
5926 == TYPE_PRECISION (integer_type_node
))))
5927 restype
= unsigned_type_node
;
5929 restype
= integer_type_node
;
5931 DECL_RESULT (current_function_decl
)
5932 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5935 /* Allocate further tree nodes temporarily during compilation
5936 of this function only. */
5937 temporary_allocation ();
5939 /* If this fcn was already referenced via a block-scope `extern' decl
5940 (or an implicit decl), propagate certain information about the usage. */
5941 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5942 TREE_ADDRESSABLE (current_function_decl
) = 1;
5947 /* Record that this function is going to be a varargs function.
5948 This is called before store_parm_decls, which is too early
5949 to call mark_varargs directly. */
5954 c_function_varargs
= 1;
5957 /* Store the parameter declarations into the current function declaration.
5958 This is called after parsing the parameter declarations, before
5959 digesting the body of the function.
5961 For an old-style definition, modify the function's type
5962 to specify at least the number of arguments. */
5967 register tree fndecl
= current_function_decl
;
5970 /* This is either a chain of PARM_DECLs (if a prototype was used)
5971 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5972 tree specparms
= current_function_parms
;
5974 /* This is a list of types declared among parms in a prototype. */
5975 tree parmtags
= current_function_parm_tags
;
5977 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5978 register tree parmdecls
= getdecls ();
5980 /* This is a chain of any other decls that came in among the parm
5981 declarations. If a parm is declared with enum {foo, bar} x;
5982 then CONST_DECLs for foo and bar are put here. */
5985 /* Nonzero if this definition is written with a prototype. */
5988 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
5990 /* This case is when the function was defined with an ANSI prototype.
5991 The parms already have decls, so we need not do anything here
5992 except record them as in effect
5993 and complain if any redundant old-style parm decls were written. */
6004 error_with_decl (fndecl
,
6005 "parm types given both in parmlist and separately");
6006 /* Get rid of the erroneous decls; don't keep them on
6007 the list of parms, since they might not be PARM_DECLs. */
6008 for (decl
= current_binding_level
->names
;
6009 decl
; decl
= TREE_CHAIN (decl
))
6010 if (DECL_NAME (decl
))
6011 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6012 for (link
= current_binding_level
->shadowed
;
6013 link
; link
= TREE_CHAIN (link
))
6014 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6015 current_binding_level
->names
= 0;
6016 current_binding_level
->shadowed
= 0;
6019 specparms
= nreverse (specparms
);
6020 for (parm
= specparms
; parm
; parm
= next
)
6022 next
= TREE_CHAIN (parm
);
6023 if (TREE_CODE (parm
) == PARM_DECL
)
6025 if (DECL_NAME (parm
) == 0)
6026 error_with_decl (parm
, "parameter name omitted");
6027 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6029 error_with_decl (parm
, "parameter `%s' declared void");
6030 /* Change the type to error_mark_node so this parameter
6031 will be ignored by assign_parms. */
6032 TREE_TYPE (parm
) = error_mark_node
;
6038 /* If we find an enum constant or a type tag,
6039 put it aside for the moment. */
6040 TREE_CHAIN (parm
) = 0;
6041 others
= chainon (others
, parm
);
6045 /* Get the decls in their original chain order
6046 and record in the function. */
6047 DECL_ARGUMENTS (fndecl
) = getdecls ();
6050 /* If this function takes a variable number of arguments,
6051 add a phony parameter to the end of the parm list,
6052 to represent the position of the first unnamed argument. */
6053 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6056 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6057 /* Let's hope the address of the unnamed parm
6058 won't depend on its type. */
6059 TREE_TYPE (dummy
) = integer_type_node
;
6060 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6061 DECL_ARGUMENTS (fndecl
)
6062 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6066 /* Now pushdecl the enum constants. */
6067 for (parm
= others
; parm
; parm
= next
)
6069 next
= TREE_CHAIN (parm
);
6070 if (DECL_NAME (parm
) == 0)
6072 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6074 else if (TREE_CODE (parm
) != PARM_DECL
)
6078 storetags (chainon (parmtags
, gettags ()));
6082 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6083 each with a parm name as the TREE_VALUE.
6085 PARMDECLS is a chain of declarations for parameters.
6086 Warning! It can also contain CONST_DECLs which are not parameters
6087 but are names of enumerators of any enum types
6088 declared among the parameters.
6090 First match each formal parameter name with its declaration.
6091 Associate decls with the names and store the decls
6092 into the TREE_PURPOSE slots. */
6094 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6095 DECL_RESULT (parm
) = 0;
6097 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6099 register tree tail
, found
= NULL
;
6101 if (TREE_VALUE (parm
) == 0)
6103 error_with_decl (fndecl
, "parameter name missing from parameter list");
6104 TREE_PURPOSE (parm
) = 0;
6108 /* See if any of the parmdecls specifies this parm by name.
6109 Ignore any enumerator decls. */
6110 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6111 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6112 && TREE_CODE (tail
) == PARM_DECL
)
6118 /* If declaration already marked, we have a duplicate name.
6119 Complain, and don't use this decl twice. */
6120 if (found
&& DECL_RESULT (found
) != 0)
6122 error_with_decl (found
, "multiple parameters named `%s'");
6126 /* If the declaration says "void", complain and ignore it. */
6127 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6129 error_with_decl (found
, "parameter `%s' declared void");
6130 TREE_TYPE (found
) = integer_type_node
;
6131 DECL_ARG_TYPE (found
) = integer_type_node
;
6132 layout_decl (found
, 0);
6135 /* Traditionally, a parm declared float is actually a double. */
6136 if (found
&& flag_traditional
6137 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6139 TREE_TYPE (found
) = double_type_node
;
6140 DECL_ARG_TYPE (found
) = double_type_node
;
6141 layout_decl (found
, 0);
6144 /* If no declaration found, default to int. */
6147 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6149 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6150 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6151 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6153 warning_with_decl (found
, "type of `%s' defaults to `int'");
6157 TREE_PURPOSE (parm
) = found
;
6159 /* Mark this decl as "already found" -- see test, above.
6160 It is safe to use DECL_RESULT for this
6161 since it is not used in PARM_DECLs or CONST_DECLs. */
6162 DECL_RESULT (found
) = error_mark_node
;
6165 /* Put anything which is on the parmdecls chain and which is
6166 not a PARM_DECL onto the list NONPARMS. (The types of
6167 non-parm things which might appear on the list include
6168 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6169 any actual PARM_DECLs not matched with any names. */
6172 for (parm
= parmdecls
; parm
; )
6174 tree next
= TREE_CHAIN (parm
);
6175 TREE_CHAIN (parm
) = 0;
6177 if (TREE_CODE (parm
) != PARM_DECL
)
6178 nonparms
= chainon (nonparms
, parm
);
6181 /* Complain about args with incomplete types. */
6182 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6184 error_with_decl (parm
, "parameter `%s' has incomplete type");
6185 TREE_TYPE (parm
) = error_mark_node
;
6188 if (DECL_RESULT (parm
) == 0)
6190 error_with_decl (parm
,
6191 "declaration for parameter `%s' but no such parameter");
6192 /* Pretend the parameter was not missing.
6193 This gets us to a standard state and minimizes
6194 further error messages. */
6196 = chainon (specparms
,
6197 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6204 /* Chain the declarations together in the order of the list of names. */
6205 /* Store that chain in the function decl, replacing the list of names. */
6207 DECL_ARGUMENTS (fndecl
) = 0;
6210 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6211 if (TREE_PURPOSE (parm
))
6214 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6216 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6217 last
= TREE_PURPOSE (parm
);
6218 TREE_CHAIN (last
) = 0;
6222 /* If there was a previous prototype,
6223 set the DECL_ARG_TYPE of each argument according to
6224 the type previously specified, and report any mismatches. */
6226 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6229 for (parm
= DECL_ARGUMENTS (fndecl
),
6230 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6231 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6232 != void_type_node
));
6233 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6235 if (parm
== 0 || type
== 0
6236 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6238 error ("number of arguments doesn't match prototype");
6239 error_with_file_and_line (current_function_prototype_file
,
6240 current_function_prototype_line
,
6241 "prototype declaration");
6244 /* Type for passing arg must be consistent
6245 with that declared for the arg. */
6246 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6248 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6249 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6251 /* Adjust argument to match prototype. E.g. a previous
6252 `int foo(float);' prototype causes
6253 `int foo(x) float x; {...}' to be treated like
6254 `int foo(float x) {...}'. This is particularly
6255 useful for argument types like uid_t. */
6256 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6257 #ifdef PROMOTE_PROTOTYPES
6258 if ((TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6259 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6260 && TYPE_PRECISION (TREE_TYPE (parm
))
6261 < TYPE_PRECISION (integer_type_node
))
6262 DECL_ARG_TYPE (parm
) = integer_type_node
;
6266 pedwarn ("promoted argument `%s' doesn't match prototype",
6267 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6268 warning_with_file_and_line
6269 (current_function_prototype_file
,
6270 current_function_prototype_line
,
6271 "prototype declaration");
6274 /* If -traditional, allow `int' argument to match
6275 `unsigned' prototype. */
6276 else if (! (flag_traditional
6277 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6278 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6280 error ("argument `%s' doesn't match prototype",
6281 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6282 error_with_file_and_line (current_function_prototype_file
,
6283 current_function_prototype_line
,
6284 "prototype declaration");
6288 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6291 /* Otherwise, create a prototype that would match. */
6295 tree actual
= 0, last
= 0, type
;
6297 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6299 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6302 TREE_CHAIN (last
) = type
;
6307 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6309 TREE_CHAIN (last
) = type
;
6313 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6314 of the type of this function, but we need to avoid having this
6315 affect the types of other similarly-typed functions, so we must
6316 first force the generation of an identical (but separate) type
6317 node for the relevant function type. The new node we create
6318 will be a variant of the main variant of the original function
6321 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6323 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6326 /* Now store the final chain of decls for the arguments
6327 as the decl-chain of the current lexical scope.
6328 Put the enumerators in as well, at the front so that
6329 DECL_ARGUMENTS is not modified. */
6331 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6334 /* Make sure the binding level for the top of the function body
6335 gets a BLOCK if there are any in the function.
6336 Otherwise, the dbx output is wrong. */
6338 keep_next_if_subblocks
= 1;
6340 /* ??? This might be an improvement,
6341 but needs to be thought about some more. */
6343 keep_next_level_flag
= 1;
6346 /* Write a record describing this function definition to the prototypes
6347 file (if requested). */
6349 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6351 /* Initialize the RTL code for the function. */
6353 init_function_start (fndecl
, input_filename
, lineno
);
6355 /* If this is a varargs function, inform function.c. */
6357 if (c_function_varargs
)
6360 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6362 declare_function_name ();
6364 /* Set up parameters and prepare for return, for the function. */
6366 expand_function_start (fndecl
, 0);
6368 /* If this function is `main', emit a call to `__main'
6369 to run global initializers, etc. */
6370 if (DECL_NAME (fndecl
)
6371 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6372 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6373 expand_main_function ();
6376 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6377 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6378 stands for an ellipsis in the identifier list.
6380 PARMLIST is the data returned by get_parm_info for the
6381 parmlist that follows the semicolon.
6383 We return a value of the same sort that get_parm_info returns,
6384 except that it describes the combination of identifiers and parmlist. */
6387 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6388 tree specparms
, parmlist
;
6391 register tree fndecl
= current_function_decl
;
6394 tree parmdecls
= TREE_PURPOSE (parmlist
);
6396 /* This is a chain of any other decls that came in among the parm
6397 declarations. They were separated already by get_parm_info,
6398 so we just need to keep them separate. */
6399 tree nonparms
= TREE_VALUE (parmlist
);
6403 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6404 DECL_RESULT (parm
) = 0;
6406 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6408 register tree tail
, found
= NULL
;
6410 /* See if any of the parmdecls specifies this parm by name. */
6411 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6412 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6418 /* If declaration already marked, we have a duplicate name.
6419 Complain, and don't use this decl twice. */
6420 if (found
&& DECL_RESULT (found
) != 0)
6422 error_with_decl (found
, "multiple parameters named `%s'");
6426 /* If the declaration says "void", complain and ignore it. */
6427 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6429 error_with_decl (found
, "parameter `%s' declared void");
6430 TREE_TYPE (found
) = integer_type_node
;
6431 DECL_ARG_TYPE (found
) = integer_type_node
;
6432 layout_decl (found
, 0);
6435 /* Traditionally, a parm declared float is actually a double. */
6436 if (found
&& flag_traditional
6437 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6439 TREE_TYPE (found
) = double_type_node
;
6440 DECL_ARG_TYPE (found
) = double_type_node
;
6441 layout_decl (found
, 0);
6444 /* If no declaration found, default to int. */
6447 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6449 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6450 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6451 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6452 error_with_decl (found
, "type of parameter `%s' is not declared");
6456 TREE_PURPOSE (parm
) = found
;
6458 /* Mark this decl as "already found" -- see test, above.
6459 It is safe to use DECL_RESULT for this
6460 since it is not used in PARM_DECLs or CONST_DECLs. */
6461 DECL_RESULT (found
) = error_mark_node
;
6464 /* Complain about any actual PARM_DECLs not matched with any names. */
6466 for (parm
= parmdecls
; parm
; )
6468 tree next
= TREE_CHAIN (parm
);
6469 TREE_CHAIN (parm
) = 0;
6471 /* Complain about args with incomplete types. */
6472 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6474 error_with_decl (parm
, "parameter `%s' has incomplete type");
6475 TREE_TYPE (parm
) = error_mark_node
;
6478 if (DECL_RESULT (parm
) == 0)
6480 error_with_decl (parm
,
6481 "declaration for parameter `%s' but no such parameter");
6482 /* Pretend the parameter was not missing.
6483 This gets us to a standard state and minimizes
6484 further error messages. */
6486 = chainon (specparms
,
6487 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6493 /* Chain the declarations together in the order of the list of names.
6494 At the same time, build up a list of their types, in reverse order. */
6500 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6501 if (TREE_PURPOSE (parm
))
6504 parmdecls
= TREE_PURPOSE (parm
);
6506 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6507 last
= TREE_PURPOSE (parm
);
6508 TREE_CHAIN (last
) = 0;
6510 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6515 return saveable_tree_cons (parmdecls
, nonparms
,
6516 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
6518 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
6521 /* Finish up a function declaration and compile that function
6522 all the way to assembler language output. The free the storage
6523 for the function definition.
6525 This is called after parsing the body of the function definition.
6527 NESTED is nonzero if the function being finished is nested in another. */
6530 finish_function (nested
)
6533 register tree fndecl
= current_function_decl
;
6535 /* TREE_READONLY (fndecl) = 1;
6536 This caused &foo to be of type ptr-to-const-function
6537 which then got a warning when stored in a ptr-to-function variable. */
6540 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6542 /* Must mark the RESULT_DECL as being in this function. */
6544 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6546 /* Obey `register' declarations if `setjmp' is called in this fn. */
6547 if (flag_traditional
&& current_function_calls_setjmp
)
6549 setjmp_protect (DECL_INITIAL (fndecl
));
6550 setjmp_protect_args ();
6553 #ifdef DEFAULT_MAIN_RETURN
6554 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6556 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6557 != integer_type_node
)
6558 warning_with_decl (fndecl
, "return type of `%s' is not `int'");
6561 /* Make it so that `main' always returns success by default. */
6562 DEFAULT_MAIN_RETURN
;
6567 /* Generate rtl for function exit. */
6568 expand_function_end (input_filename
, lineno
, 0);
6570 /* So we can tell if jump_optimize sets it to 1. */
6573 /* Run the optimizers and output the assembler code for this function. */
6574 rest_of_compilation (fndecl
);
6576 current_function_returns_null
|= can_reach_end
;
6578 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6579 warning ("`noreturn' function does return");
6580 else if (warn_return_type
&& can_reach_end
6581 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
6582 /* If this function returns non-void and control can drop through,
6584 warning ("control reaches end of non-void function");
6585 /* With just -W, complain only if function returns both with
6586 and without a value. */
6587 else if (extra_warnings
6588 && current_function_returns_value
&& current_function_returns_null
)
6589 warning ("this function may return with or without a value");
6591 /* If requested, warn about function definitions where the function will
6592 return a value (usually of some struct or union type) which itself will
6593 take up a lot of stack space. */
6595 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6597 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6601 register tree ret_type_size
= TYPE_SIZE (ret_type
);
6603 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
6606 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
6608 if (units
> larger_than_size
)
6609 warning_with_decl (fndecl
,
6610 "size of return value of `%s' is %u bytes",
6616 /* Free all the tree nodes making up this function. */
6617 /* Switch back to allocating nodes permanently
6618 until we start another function. */
6620 permanent_allocation (1);
6622 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6624 /* Stop pointing to the local nodes about to be freed. */
6625 /* But DECL_INITIAL must remain nonzero so we know this
6626 was an actual function definition. */
6627 /* For a nested function, this is done in pop_c_function_context. */
6628 /* If rest_of_compilation set this to 0, leave it 0. */
6629 if (DECL_INITIAL (fndecl
) != 0)
6630 DECL_INITIAL (fndecl
) = error_mark_node
;
6631 DECL_ARGUMENTS (fndecl
) = 0;
6636 /* Let the error reporting routines know that we're outside a
6637 function. For a nested function, this value is used in
6638 pop_c_function_context and then reset via pop_function_context. */
6639 current_function_decl
= NULL
;
6643 /* Save and restore the variables in this file and elsewhere
6644 that keep track of the progress of compilation of the current function.
6645 Used for nested functions. */
6649 struct c_function
*next
;
6651 tree shadowed_labels
;
6654 int warn_about_return_type
;
6656 struct binding_level
*binding_level
;
6659 struct c_function
*c_function_chain
;
6661 /* Save and reinitialize the variables
6662 used during compilation of a C function. */
6665 push_c_function_context ()
6667 struct c_function
*p
6668 = (struct c_function
*) xmalloc (sizeof (struct c_function
));
6671 pedwarn ("ANSI C forbids nested functions");
6673 push_function_context ();
6675 p
->next
= c_function_chain
;
6676 c_function_chain
= p
;
6678 p
->named_labels
= named_labels
;
6679 p
->shadowed_labels
= shadowed_labels
;
6680 p
->returns_value
= current_function_returns_value
;
6681 p
->returns_null
= current_function_returns_null
;
6682 p
->warn_about_return_type
= warn_about_return_type
;
6683 p
->extern_inline
= current_extern_inline
;
6684 p
->binding_level
= current_binding_level
;
6687 /* Restore the variables used during compilation of a C function. */
6690 pop_c_function_context ()
6692 struct c_function
*p
= c_function_chain
;
6695 /* Bring back all the labels that were shadowed. */
6696 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
6697 if (DECL_NAME (TREE_VALUE (link
)) != 0)
6698 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
6699 = TREE_VALUE (link
);
6701 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
6703 /* Stop pointing to the local nodes about to be freed. */
6704 /* But DECL_INITIAL must remain nonzero so we know this
6705 was an actual function definition. */
6706 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6707 DECL_ARGUMENTS (current_function_decl
) = 0;
6710 pop_function_context ();
6712 c_function_chain
= p
->next
;
6714 named_labels
= p
->named_labels
;
6715 shadowed_labels
= p
->shadowed_labels
;
6716 current_function_returns_value
= p
->returns_value
;
6717 current_function_returns_null
= p
->returns_null
;
6718 warn_about_return_type
= p
->warn_about_return_type
;
6719 current_extern_inline
= p
->extern_inline
;
6720 current_binding_level
= p
->binding_level
;