1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL, /* Ordinary declaration */
40 FUNCDEF, /* Function definition */
41 PARM, /* Declaration of parm before function body */
42 FIELD, /* Declaration inside struct or union */
43 BITFIELD, /* Likewise but with specified width */
44 TYPENAME}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node;
111 tree integer_type_node;
112 tree long_integer_type_node;
113 tree long_long_integer_type_node;
115 tree short_unsigned_type_node;
116 tree unsigned_type_node;
117 tree long_unsigned_type_node;
118 tree long_long_unsigned_type_node;
120 tree boolean_type_node;
121 tree boolean_false_node;
122 tree boolean_true_node;
124 tree ptrdiff_type_node;
126 tree unsigned_char_type_node;
127 tree signed_char_type_node;
129 tree wchar_type_node;
130 tree signed_wchar_type_node;
131 tree unsigned_wchar_type_node;
133 tree float_type_node;
134 tree double_type_node;
135 tree long_double_type_node;
137 tree complex_integer_type_node;
138 tree complex_float_type_node;
139 tree complex_double_type_node;
140 tree complex_long_double_type_node;
142 tree intQI_type_node;
143 tree intHI_type_node;
144 tree intSI_type_node;
145 tree intDI_type_node;
147 tree unsigned_intQI_type_node;
148 tree unsigned_intHI_type_node;
149 tree unsigned_intSI_type_node;
150 tree unsigned_intDI_type_node;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node, const_ptr_type_node;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node, const_string_type_node;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double, double_ftype_double_double;
186 tree int_ftype_int, long_ftype_long;
187 tree float_ftype_float;
188 tree ldouble_ftype_ldouble;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr, int_ftype_string_string;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node;
204 tree null_pointer_node;
206 /* A node for the integer constant 1. */
208 tree integer_one_node;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file;
216 int pending_invalid_xref_line;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file;
252 static int current_function_prototype_line;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level *level_chain;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level *current_binding_level;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level *free_binding_level;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level *global_binding_level;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level *label_level_chain;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors, static_dtors;
412 /* Forward declarations. */
414 static struct binding_level * make_binding_level PROTO((void));
415 static void clear_limbo_values PROTO((tree));
416 static int duplicate_decls PROTO((tree, tree, int));
417 static char *redeclaration_error_message PROTO((tree, tree));
418 static void storedecls PROTO((tree));
419 static void storetags PROTO((tree));
420 static tree lookup_tag PROTO((enum tree_code, tree,
421 struct binding_level *, int));
422 static tree lookup_tag_reverse PROTO((tree));
423 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
425 static tree grokparms PROTO((tree, int));
426 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
427 static void layout_array_type PROTO((tree));
429 /* C-specific option variables. */
431 /* Nonzero means allow type mismatches in conditional expressions;
432 just make their values `void'. */
434 int flag_cond_mismatch;
436 /* Nonzero means give `double' the same size as `float'. */
438 int flag_short_double;
440 /* Nonzero means don't recognize the keyword `asm'. */
444 /* Nonzero means don't recognize any builtin functions. */
448 /* Nonzero means don't recognize the non-ANSI builtin functions.
451 int flag_no_nonansi_builtin;
453 /* Nonzero means do some things the same way PCC does. */
455 int flag_traditional;
457 /* Nonzero means that we have builtin functions, and main is an int */
461 /* Nonzero means to allow single precision math even if we're generally
462 being traditional. */
463 int flag_allow_single_precision = 0;
465 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
467 int flag_signed_bitfields = 1;
468 int explicit_flag_signed_bitfields = 0;
470 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
472 int flag_no_ident = 0;
474 /* Nonzero means warn about implicit declarations. */
478 /* Nonzero means give string constants the type `const char *'
479 to get extra warnings from them. These warnings will be too numerous
480 to be useful, except in thoroughly ANSIfied programs. */
482 int warn_write_strings;
484 /* Nonzero means warn about pointer casts that can drop a type qualifier
485 from the pointer target type. */
489 /* Nonzero means warn when casting a function call to a type that does
490 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
491 when there is no previous declaration of sqrt or malloc. */
493 int warn_bad_function_cast;
495 /* Warn about traditional constructs whose meanings changed in ANSI C. */
497 int warn_traditional;
499 /* Nonzero means warn about sizeof(function) or addition/subtraction
500 of function pointers. */
502 int warn_pointer_arith;
504 /* Nonzero means warn for non-prototype function decls
505 or non-prototyped defs without previous prototype. */
507 int warn_strict_prototypes;
509 /* Nonzero means warn for any global function def
510 without separate previous prototype decl. */
512 int warn_missing_prototypes;
514 /* Nonzero means warn for any global function def
515 without separate previous decl. */
517 int warn_missing_declarations;
519 /* Nonzero means warn about multiple (redundant) decls for the same single
520 variable or function. */
522 int warn_redundant_decls = 0;
524 /* Nonzero means warn about extern declarations of objects not at
525 file-scope level and about *all* declarations of functions (whether
526 extern or static) not at file-scope level. Note that we exclude
527 implicit function declarations. To get warnings about those, use
530 int warn_nested_externs = 0;
532 /* Warn about *printf or *scanf format/argument anomalies. */
536 /* Warn about a subscript that has type char. */
538 int warn_char_subscripts = 0;
540 /* Warn if a type conversion is done that might have confusing results. */
544 /* Warn if adding () is suggested. */
546 int warn_parentheses;
548 /* Warn if initializer is not completely bracketed. */
550 int warn_missing_braces;
552 /* Warn if main is suspicious. */
556 /* Warn about comparison of signed and unsigned values. */
558 int warn_sign_compare;
560 /* Nonzero means `$' can be in an identifier. */
562 #ifndef DOLLARS_IN_IDENTIFIERS
563 #define DOLLARS_IN_IDENTIFIERS 1
565 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
567 /* Decode the string P as a language-specific option for C.
568 Return 1 if it is recognized (and handle it);
569 return 0 if not recognized. */
575 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
577 flag_traditional = 1;
578 flag_writable_strings = 1;
580 else if (!strcmp (p, "-fallow-single-precision"))
581 flag_allow_single_precision = 1;
582 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
587 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
591 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
595 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
597 flag_traditional = 0;
598 flag_writable_strings = 0;
600 else if (!strcmp (p, "-fdollars-in-identifiers"))
601 dollars_in_ident = 1;
602 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
603 dollars_in_ident = 0;
604 else if (!strcmp (p, "-fsigned-char"))
605 flag_signed_char = 1;
606 else if (!strcmp (p, "-funsigned-char"))
607 flag_signed_char = 0;
608 else if (!strcmp (p, "-fno-signed-char"))
609 flag_signed_char = 0;
610 else if (!strcmp (p, "-fno-unsigned-char"))
611 flag_signed_char = 1;
612 else if (!strcmp (p, "-fsigned-bitfields")
613 || !strcmp (p, "-fno-unsigned-bitfields"))
615 flag_signed_bitfields = 1;
616 explicit_flag_signed_bitfields = 1;
618 else if (!strcmp (p, "-funsigned-bitfields")
619 || !strcmp (p, "-fno-signed-bitfields"))
621 flag_signed_bitfields = 0;
622 explicit_flag_signed_bitfields = 1;
624 else if (!strcmp (p, "-fshort-enums"))
625 flag_short_enums = 1;
626 else if (!strcmp (p, "-fno-short-enums"))
627 flag_short_enums = 0;
628 else if (!strcmp (p, "-fcond-mismatch"))
629 flag_cond_mismatch = 1;
630 else if (!strcmp (p, "-fno-cond-mismatch"))
631 flag_cond_mismatch = 0;
632 else if (!strcmp (p, "-fshort-double"))
633 flag_short_double = 1;
634 else if (!strcmp (p, "-fno-short-double"))
635 flag_short_double = 0;
636 else if (!strcmp (p, "-fasm"))
638 else if (!strcmp (p, "-fno-asm"))
640 else if (!strcmp (p, "-fbuiltin"))
642 else if (!strcmp (p, "-fno-builtin"))
644 else if (!strcmp (p, "-fno-ident"))
646 else if (!strcmp (p, "-fident"))
648 else if (!strcmp (p, "-ansi"))
649 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
650 else if (!strcmp (p, "-Wimplicit"))
652 else if (!strcmp (p, "-Wno-implicit"))
654 else if (!strcmp (p, "-Wwrite-strings"))
655 warn_write_strings = 1;
656 else if (!strcmp (p, "-Wno-write-strings"))
657 warn_write_strings = 0;
658 else if (!strcmp (p, "-Wcast-qual"))
660 else if (!strcmp (p, "-Wno-cast-qual"))
662 else if (!strcmp (p, "-Wbad-function-cast"))
663 warn_bad_function_cast = 1;
664 else if (!strcmp (p, "-Wno-bad-function-cast"))
665 warn_bad_function_cast = 0;
666 else if (!strcmp (p, "-Wpointer-arith"))
667 warn_pointer_arith = 1;
668 else if (!strcmp (p, "-Wno-pointer-arith"))
669 warn_pointer_arith = 0;
670 else if (!strcmp (p, "-Wstrict-prototypes"))
671 warn_strict_prototypes = 1;
672 else if (!strcmp (p, "-Wno-strict-prototypes"))
673 warn_strict_prototypes = 0;
674 else if (!strcmp (p, "-Wmissing-prototypes"))
675 warn_missing_prototypes = 1;
676 else if (!strcmp (p, "-Wno-missing-prototypes"))
677 warn_missing_prototypes = 0;
678 else if (!strcmp (p, "-Wmissing-declarations"))
679 warn_missing_declarations = 1;
680 else if (!strcmp (p, "-Wno-missing-declarations"))
681 warn_missing_declarations = 0;
682 else if (!strcmp (p, "-Wredundant-decls"))
683 warn_redundant_decls = 1;
684 else if (!strcmp (p, "-Wno-redundant-decls"))
685 warn_redundant_decls = 0;
686 else if (!strcmp (p, "-Wnested-externs"))
687 warn_nested_externs = 1;
688 else if (!strcmp (p, "-Wno-nested-externs"))
689 warn_nested_externs = 0;
690 else if (!strcmp (p, "-Wtraditional"))
691 warn_traditional = 1;
692 else if (!strcmp (p, "-Wno-traditional"))
693 warn_traditional = 0;
694 else if (!strcmp (p, "-Wformat"))
696 else if (!strcmp (p, "-Wno-format"))
698 else if (!strcmp (p, "-Wchar-subscripts"))
699 warn_char_subscripts = 1;
700 else if (!strcmp (p, "-Wno-char-subscripts"))
701 warn_char_subscripts = 0;
702 else if (!strcmp (p, "-Wconversion"))
704 else if (!strcmp (p, "-Wno-conversion"))
706 else if (!strcmp (p, "-Wparentheses"))
707 warn_parentheses = 1;
708 else if (!strcmp (p, "-Wno-parentheses"))
709 warn_parentheses = 0;
710 else if (!strcmp (p, "-Wreturn-type"))
711 warn_return_type = 1;
712 else if (!strcmp (p, "-Wno-return-type"))
713 warn_return_type = 0;
714 else if (!strcmp (p, "-Wcomment"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p, "-Wno-comment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wcomments"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wno-comments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wtrigraphs"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wno-trigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wundef"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wno-undef"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wimport"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wno-import"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wmissing-braces"))
735 warn_missing_braces = 1;
736 else if (!strcmp (p, "-Wno-missing-braces"))
737 warn_missing_braces = 0;
738 else if (!strcmp (p, "-Wmain"))
740 else if (!strcmp (p, "-Wno-main"))
742 else if (!strcmp (p, "-Wsign-compare"))
743 warn_sign_compare = 1;
744 else if (!strcmp (p, "-Wno-sign-compare"))
745 warn_sign_compare = 0;
746 else if (!strcmp (p, "-Wall"))
748 /* We save the value of warn_uninitialized, since if they put
749 -Wuninitialized on the command line, we need to generate a
750 warning about not using it without also specifying -O. */
751 if (warn_uninitialized != 1)
752 warn_uninitialized = 2;
754 warn_return_type = 1;
758 warn_char_subscripts = 1;
759 warn_parentheses = 1;
760 warn_missing_braces = 1;
761 warn_sign_compare = 1;
762 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
763 it off only if it's not explicit. */
772 /* Hooks for print_node. */
775 print_lang_decl (file, node, indent)
783 print_lang_type (file, node, indent)
791 print_lang_identifier (file, node, indent)
796 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
797 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
798 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
799 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
800 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
801 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
804 /* Hook called at end of compilation to assume 1 elt
805 for a top-level array decl that wasn't complete before. */
808 finish_incomplete_decl (decl)
811 if (TREE_CODE (decl) == VAR_DECL)
813 tree type = TREE_TYPE (decl);
814 if (type != error_mark_node
815 && TREE_CODE (type) == ARRAY_TYPE
816 && TYPE_DOMAIN (type) == 0)
818 if (! DECL_EXTERNAL (decl))
819 warning_with_decl (decl, "array `%s' assumed to have one element");
821 complete_array_type (type, NULL_TREE, 1);
823 layout_decl (decl, 0);
828 /* Create a new `struct binding_level'. */
831 struct binding_level *
832 make_binding_level ()
835 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
838 /* Nonzero if we are currently in the global binding level. */
843 return current_binding_level == global_binding_level;
849 keep_next_level_flag = 1;
852 /* Nonzero if the current level needs to have a BLOCK made. */
857 return ((current_binding_level->keep_if_subblocks
858 && current_binding_level->blocks != 0)
859 || current_binding_level->keep
860 || current_binding_level->names != 0
861 || (current_binding_level->tags != 0
862 && !current_binding_level->tag_transparent));
865 /* Identify this binding level as a level of parameters.
866 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
867 But it turns out there is no way to pass the right value for
868 DEFINITION_FLAG, so we ignore it. */
871 declare_parm_level (definition_flag)
874 current_binding_level->parm_flag = 1;
877 /* Nonzero if currently making parm declarations. */
882 return current_binding_level->parm_flag;
885 /* Enter a new binding level.
886 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
887 not for that of tags. */
890 pushlevel (tag_transparent)
893 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
895 /* If this is the top level of a function,
896 just make sure that NAMED_LABELS is 0. */
898 if (current_binding_level == global_binding_level)
903 /* Reuse or create a struct for this binding level. */
905 if (free_binding_level)
907 newlevel = free_binding_level;
908 free_binding_level = free_binding_level->level_chain;
912 newlevel = make_binding_level ();
915 /* Add this level to the front of the chain (stack) of levels that
918 *newlevel = clear_binding_level;
919 newlevel->tag_transparent
921 || (current_binding_level
922 ? current_binding_level->subblocks_tag_transparent
924 newlevel->level_chain = current_binding_level;
925 current_binding_level = newlevel;
926 newlevel->keep = keep_next_level_flag;
927 keep_next_level_flag = 0;
928 newlevel->keep_if_subblocks = keep_next_if_subblocks;
929 keep_next_if_subblocks = 0;
932 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
935 clear_limbo_values (block)
940 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
941 if (DECL_NAME (tem) != 0)
942 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
944 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
945 clear_limbo_values (tem);
948 /* Exit a binding level.
949 Pop the level off, and restore the state of the identifier-decl mappings
950 that were in effect when this level was entered.
952 If KEEP is nonzero, this level had explicit declarations, so
953 and create a "block" (a BLOCK node) for the level
954 to record its declarations and subblocks for symbol table output.
956 If FUNCTIONBODY is nonzero, this level is the body of a function,
957 so create a block as if KEEP were set and also clear out all
960 If REVERSE is nonzero, reverse the order of decls before putting
961 them into the BLOCK. */
964 poplevel (keep, reverse, functionbody)
970 /* The chain of decls was accumulated in reverse order.
971 Put it into forward order, just for cleanliness. */
973 tree tags = current_binding_level->tags;
974 tree subblocks = current_binding_level->blocks;
977 int block_previously_created;
979 keep |= current_binding_level->keep;
981 /* This warning is turned off because it causes warnings for
982 declarations like `extern struct foo *x'. */
984 /* Warn about incomplete structure types in this level. */
985 for (link = tags; link; link = TREE_CHAIN (link))
986 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
988 tree type = TREE_VALUE (link);
990 switch (TREE_CODE (type))
993 errmsg = "`struct %s' incomplete in scope ending here";
996 errmsg = "`union %s' incomplete in scope ending here";
999 errmsg = "`enum %s' incomplete in scope ending here";
1002 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1003 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1005 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1006 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1010 /* Get the decls in the order they were written.
1011 Usually current_binding_level->names is in reverse order.
1012 But parameter decls were previously put in forward order. */
1015 current_binding_level->names
1016 = decls = nreverse (current_binding_level->names);
1018 decls = current_binding_level->names;
1020 /* Output any nested inline functions within this block
1021 if they weren't already output. */
1023 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1024 if (TREE_CODE (decl) == FUNCTION_DECL
1025 && ! TREE_ASM_WRITTEN (decl)
1026 && DECL_INITIAL (decl) != 0
1027 && TREE_ADDRESSABLE (decl))
1029 /* If this decl was copied from a file-scope decl
1030 on account of a block-scope extern decl,
1031 propagate TREE_ADDRESSABLE to the file-scope decl.
1033 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1034 true, since then the decl goes through save_for_inline_copying. */
1035 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1036 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1037 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1038 else if (DECL_SAVED_INSNS (decl) != 0)
1040 push_function_context ();
1041 output_inline_function (decl);
1042 pop_function_context ();
1046 /* If there were any declarations or structure tags in that level,
1047 or if this level is a function body,
1048 create a BLOCK to record them for the life of this function. */
1051 block_previously_created = (current_binding_level->this_block != 0);
1052 if (block_previously_created)
1053 block = current_binding_level->this_block;
1054 else if (keep || functionbody
1055 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1056 block = make_node (BLOCK);
1059 BLOCK_VARS (block) = decls;
1060 BLOCK_TYPE_TAGS (block) = tags;
1061 BLOCK_SUBBLOCKS (block) = subblocks;
1062 remember_end_note (block);
1065 /* In each subblock, record that this is its superior. */
1067 for (link = subblocks; link; link = TREE_CHAIN (link))
1068 BLOCK_SUPERCONTEXT (link) = block;
1070 /* Clear out the meanings of the local variables of this level. */
1072 for (link = decls; link; link = TREE_CHAIN (link))
1074 if (DECL_NAME (link) != 0)
1076 /* If the ident. was used or addressed via a local extern decl,
1077 don't forget that fact. */
1078 if (DECL_EXTERNAL (link))
1080 if (TREE_USED (link))
1081 TREE_USED (DECL_NAME (link)) = 1;
1082 if (TREE_ADDRESSABLE (link))
1083 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1085 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1089 /* Restore all name-meanings of the outer levels
1090 that were shadowed by this level. */
1092 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1093 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1095 /* If the level being exited is the top level of a function,
1096 check over all the labels, and clear out the current
1097 (function local) meanings of their names. */
1101 clear_limbo_values (block);
1103 /* If this is the top level block of a function,
1104 the vars are the function's parameters.
1105 Don't leave them in the BLOCK because they are
1106 found in the FUNCTION_DECL instead. */
1108 BLOCK_VARS (block) = 0;
1110 /* Clear out the definitions of all label names,
1111 since their scopes end here,
1112 and add them to BLOCK_VARS. */
1114 for (link = named_labels; link; link = TREE_CHAIN (link))
1116 register tree label = TREE_VALUE (link);
1118 if (DECL_INITIAL (label) == 0)
1120 error_with_decl (label, "label `%s' used but not defined");
1121 /* Avoid crashing later. */
1122 define_label (input_filename, lineno,
1125 else if (warn_unused && !TREE_USED (label))
1126 warning_with_decl (label, "label `%s' defined but not used");
1127 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1129 /* Put the labels into the "variables" of the
1130 top-level block, so debugger can see them. */
1131 TREE_CHAIN (label) = BLOCK_VARS (block);
1132 BLOCK_VARS (block) = label;
1136 /* Pop the current level, and free the structure for reuse. */
1139 register struct binding_level *level = current_binding_level;
1140 current_binding_level = current_binding_level->level_chain;
1142 level->level_chain = free_binding_level;
1143 free_binding_level = level;
1146 /* Dispose of the block that we just made inside some higher level. */
1148 DECL_INITIAL (current_function_decl) = block;
1151 if (!block_previously_created)
1152 current_binding_level->blocks
1153 = chainon (current_binding_level->blocks, block);
1155 /* If we did not make a block for the level just exited,
1156 any blocks made for inner levels
1157 (since they cannot be recorded as subblocks in that level)
1158 must be carried forward so they will later become subblocks
1159 of something else. */
1161 current_binding_level->blocks
1162 = chainon (current_binding_level->blocks, subblocks);
1164 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1165 binding contour so that they point to the appropriate construct, i.e.
1166 either to the current FUNCTION_DECL node, or else to the BLOCK node
1167 we just constructed.
1169 Note that for tagged types whose scope is just the formal parameter
1170 list for some function type specification, we can't properly set
1171 their TYPE_CONTEXTs here, because we don't have a pointer to the
1172 appropriate FUNCTION_TYPE node readily available to us. For those
1173 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1174 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1175 node which will represent the "scope" for these "parameter list local"
1180 for (link = tags; link; link = TREE_CHAIN (link))
1181 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1183 for (link = tags; link; link = TREE_CHAIN (link))
1184 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1187 TREE_USED (block) = 1;
1191 /* Delete the node BLOCK from the current binding level.
1192 This is used for the block inside a stmt expr ({...})
1193 so that the block can be reinserted where appropriate. */
1196 delete_block (block)
1200 if (current_binding_level->blocks == block)
1201 current_binding_level->blocks = TREE_CHAIN (block);
1202 for (t = current_binding_level->blocks; t;)
1204 if (TREE_CHAIN (t) == block)
1205 TREE_CHAIN (t) = TREE_CHAIN (block);
1209 TREE_CHAIN (block) = NULL;
1210 /* Clear TREE_USED which is always set by poplevel.
1211 The flag is set again if insert_block is called. */
1212 TREE_USED (block) = 0;
1215 /* Insert BLOCK at the end of the list of subblocks of the
1216 current binding level. This is used when a BIND_EXPR is expanded,
1217 to handle the BLOCK node inside the BIND_EXPR. */
1220 insert_block (block)
1223 TREE_USED (block) = 1;
1224 current_binding_level->blocks
1225 = chainon (current_binding_level->blocks, block);
1228 /* Set the BLOCK node for the innermost scope
1229 (the one we are currently in). */
1233 register tree block;
1235 current_binding_level->this_block = block;
1241 register struct binding_level *newlevel;
1243 /* Reuse or create a struct for this binding level. */
1245 if (free_binding_level)
1247 newlevel = free_binding_level;
1248 free_binding_level = free_binding_level->level_chain;
1252 newlevel = make_binding_level ();
1255 /* Add this level to the front of the chain (stack) of label levels. */
1257 newlevel->level_chain = label_level_chain;
1258 label_level_chain = newlevel;
1260 newlevel->names = named_labels;
1261 newlevel->shadowed = shadowed_labels;
1263 shadowed_labels = 0;
1269 register struct binding_level *level = label_level_chain;
1272 /* Clear out the definitions of the declared labels in this level.
1273 Leave in the list any ordinary, non-declared labels. */
1274 for (link = named_labels, prev = 0; link;)
1276 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1278 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1280 error_with_decl (TREE_VALUE (link),
1281 "label `%s' used but not defined");
1282 /* Avoid crashing later. */
1283 define_label (input_filename, lineno,
1284 DECL_NAME (TREE_VALUE (link)));
1286 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1287 warning_with_decl (TREE_VALUE (link),
1288 "label `%s' defined but not used");
1289 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1291 /* Delete this element from the list. */
1292 link = TREE_CHAIN (link);
1294 TREE_CHAIN (prev) = link;
1296 named_labels = link;
1301 link = TREE_CHAIN (link);
1305 /* Bring back all the labels that were shadowed. */
1306 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1307 if (DECL_NAME (TREE_VALUE (link)) != 0)
1308 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1309 = TREE_VALUE (link);
1311 named_labels = chainon (named_labels, level->names);
1312 shadowed_labels = level->shadowed;
1314 /* Pop the current level, and free the structure for reuse. */
1315 label_level_chain = label_level_chain->level_chain;
1316 level->level_chain = free_binding_level;
1317 free_binding_level = level;
1320 /* Push a definition or a declaration of struct, union or enum tag "name".
1321 "type" should be the type node.
1322 We assume that the tag "name" is not already defined.
1324 Note that the definition may really be just a forward reference.
1325 In that case, the TYPE_SIZE will be zero. */
1328 pushtag (name, type)
1331 register struct binding_level *b;
1333 /* Find the proper binding level for this type tag. */
1335 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1340 /* Record the identifier as the type's name if it has none. */
1342 if (TYPE_NAME (type) == 0)
1343 TYPE_NAME (type) = name;
1346 if (b == global_binding_level)
1347 b->tags = perm_tree_cons (name, type, b->tags);
1349 b->tags = saveable_tree_cons (name, type, b->tags);
1351 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1352 tagged type we just added to the current binding level. This fake
1353 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1354 to output a representation of a tagged type, and it also gives
1355 us a convenient place to record the "scope start" address for the
1358 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1360 /* An approximation for now, so we can tell this is a function-scope tag.
1361 This will be updated in poplevel. */
1362 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1365 /* Handle when a new declaration NEWDECL
1366 has the same name as an old one OLDDECL
1367 in the same binding contour.
1368 Prints an error message if appropriate.
1370 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1371 Otherwise, return 0.
1373 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1374 and OLDDECL is in an outer binding level and should thus not be changed. */
1377 duplicate_decls (newdecl, olddecl, different_binding_level)
1378 register tree newdecl, olddecl;
1379 int different_binding_level;
1381 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1382 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1383 && DECL_INITIAL (newdecl) != 0);
1384 tree oldtype = TREE_TYPE (olddecl);
1385 tree newtype = TREE_TYPE (newdecl);
1388 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1389 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1391 if (TREE_CODE (newtype) == ERROR_MARK
1392 || TREE_CODE (oldtype) == ERROR_MARK)
1395 /* New decl is completely inconsistent with the old one =>
1396 tell caller to replace the old one.
1397 This is always an error except in the case of shadowing a builtin. */
1398 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1400 if (TREE_CODE (olddecl) == FUNCTION_DECL
1401 && (DECL_BUILT_IN (olddecl)
1402 || DECL_BUILT_IN_NONANSI (olddecl)))
1404 /* If you declare a built-in or predefined function name as static,
1405 the old definition is overridden,
1406 but optionally warn this was a bad choice of name. */
1407 if (!TREE_PUBLIC (newdecl))
1411 else if (DECL_BUILT_IN (olddecl))
1412 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1414 warning_with_decl (newdecl, "shadowing library function `%s'");
1416 /* Likewise, if the built-in is not ansi, then programs can
1417 override it even globally without an error. */
1418 else if (! DECL_BUILT_IN (olddecl))
1419 warning_with_decl (newdecl,
1420 "library function `%s' declared as non-function");
1422 else if (DECL_BUILT_IN_NONANSI (olddecl))
1423 warning_with_decl (newdecl,
1424 "built-in function `%s' declared as non-function");
1426 warning_with_decl (newdecl,
1427 "built-in function `%s' declared as non-function");
1431 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1432 error_with_decl (olddecl, "previous declaration of `%s'");
1438 /* For real parm decl following a forward decl,
1439 return 1 so old decl will be reused. */
1440 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1441 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1444 /* The new declaration is the same kind of object as the old one.
1445 The declarations may partially match. Print warnings if they don't
1446 match enough. Ultimately, copy most of the information from the new
1447 decl to the old one, and keep using the old one. */
1449 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1450 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1451 && DECL_INITIAL (olddecl) == 0)
1452 /* If -traditional, avoid error for redeclaring fcn
1453 after implicit decl. */
1455 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1456 && DECL_BUILT_IN (olddecl))
1458 /* A function declaration for a built-in function. */
1459 if (!TREE_PUBLIC (newdecl))
1461 /* If you declare a built-in function name as static, the
1462 built-in definition is overridden,
1463 but optionally warn this was a bad choice of name. */
1465 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1466 /* Discard the old built-in function. */
1469 else if (!types_match)
1471 /* Accept the return type of the new declaration if same modes. */
1472 tree oldreturntype = TREE_TYPE (oldtype);
1473 tree newreturntype = TREE_TYPE (newtype);
1475 /* Make sure we put the new type in the same obstack as the old ones.
1476 If the old types are not both in the same obstack, use the
1478 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1479 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1482 push_obstacks_nochange ();
1483 end_temporary_allocation ();
1486 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1488 /* Function types may be shared, so we can't just modify
1489 the return type of olddecl's function type. */
1491 = build_function_type (newreturntype,
1492 TYPE_ARG_TYPES (oldtype));
1494 types_match = comptypes (newtype, trytype);
1498 /* Accept harmless mismatch in first argument type also.
1500 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1501 && TYPE_ARG_TYPES (oldtype) != 0
1502 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1503 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1504 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1505 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1507 /* Function types may be shared, so we can't just modify
1508 the return type of olddecl's function type. */
1510 = build_function_type (TREE_TYPE (oldtype),
1511 tree_cons (NULL_TREE,
1512 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1513 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1515 types_match = comptypes (newtype, trytype);
1519 if (! different_binding_level)
1520 TREE_TYPE (olddecl) = oldtype;
1526 /* If types don't match for a built-in, throw away the built-in. */
1527 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1531 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1532 && DECL_SOURCE_LINE (olddecl) == 0)
1534 /* A function declaration for a predeclared function
1535 that isn't actually built in. */
1536 if (!TREE_PUBLIC (newdecl))
1538 /* If you declare it as static, the
1539 default definition is overridden. */
1542 else if (!types_match)
1544 /* If the types don't match, preserve volatility indication.
1545 Later on, we will discard everything else about the
1546 default declaration. */
1547 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1550 /* Permit char *foo () to match void *foo (...) if not pedantic,
1551 if one of them came from a system header file. */
1552 else if (!types_match
1553 && TREE_CODE (olddecl) == FUNCTION_DECL
1554 && TREE_CODE (newdecl) == FUNCTION_DECL
1555 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1556 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1557 && (DECL_IN_SYSTEM_HEADER (olddecl)
1558 || DECL_IN_SYSTEM_HEADER (newdecl))
1559 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1560 && TYPE_ARG_TYPES (oldtype) == 0
1561 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1562 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1564 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1565 && TYPE_ARG_TYPES (newtype) == 0
1566 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1567 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1570 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1571 /* Make sure we keep void * as ret type, not char *. */
1572 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1573 TREE_TYPE (newdecl) = newtype = oldtype;
1575 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1576 we will come back here again. */
1577 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1579 else if (!types_match
1580 /* Permit char *foo (int, ...); followed by char *foo ();
1582 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1584 /* Return types must still match. */
1585 && comptypes (TREE_TYPE (oldtype),
1586 TREE_TYPE (newtype))
1587 && TYPE_ARG_TYPES (newtype) == 0))
1589 error_with_decl (newdecl, "conflicting types for `%s'");
1590 /* Check for function type mismatch
1591 involving an empty arglist vs a nonempty one. */
1592 if (TREE_CODE (olddecl) == FUNCTION_DECL
1593 && comptypes (TREE_TYPE (oldtype),
1594 TREE_TYPE (newtype))
1595 && ((TYPE_ARG_TYPES (oldtype) == 0
1596 && DECL_INITIAL (olddecl) == 0)
1598 (TYPE_ARG_TYPES (newtype) == 0
1599 && DECL_INITIAL (newdecl) == 0)))
1601 /* Classify the problem further. */
1602 register tree t = TYPE_ARG_TYPES (oldtype);
1604 t = TYPE_ARG_TYPES (newtype);
1605 for (; t; t = TREE_CHAIN (t))
1607 register tree type = TREE_VALUE (t);
1609 if (TREE_CHAIN (t) == 0
1610 && TYPE_MAIN_VARIANT (type) != void_type_node)
1612 error ("A parameter list with an ellipsis can't match");
1613 error ("an empty parameter name list declaration.");
1617 if (TYPE_MAIN_VARIANT (type) == float_type_node
1618 || C_PROMOTING_INTEGER_TYPE_P (type))
1620 error ("An argument type that has a default promotion");
1621 error ("can't match an empty parameter name list declaration.");
1626 error_with_decl (olddecl, "previous declaration of `%s'");
1630 errmsg = redeclaration_error_message (newdecl, olddecl);
1633 error_with_decl (newdecl, errmsg);
1634 error_with_decl (olddecl,
1635 ((DECL_INITIAL (olddecl)
1636 && current_binding_level == global_binding_level)
1637 ? "`%s' previously defined here"
1638 : "`%s' previously declared here"));
1640 else if (TREE_CODE (newdecl) == TYPE_DECL
1641 && (DECL_IN_SYSTEM_HEADER (olddecl)
1642 || DECL_IN_SYSTEM_HEADER (newdecl)))
1644 warning_with_decl (newdecl, "redefinition of `%s'");
1647 ((DECL_INITIAL (olddecl)
1648 && current_binding_level == global_binding_level)
1649 ? "`%s' previously defined here"
1650 : "`%s' previously declared here"));
1652 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1653 && DECL_INITIAL (olddecl) != 0
1654 && TYPE_ARG_TYPES (oldtype) == 0
1655 && TYPE_ARG_TYPES (newtype) != 0
1656 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1658 register tree type, parm;
1660 /* Prototype decl follows defn w/o prototype. */
1662 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1663 type = TYPE_ARG_TYPES (newtype),
1665 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1666 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1667 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1669 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1670 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1672 errmsg = "prototype for `%s' follows and number of arguments";
1675 /* Type for passing arg must be consistent
1676 with that declared for the arg. */
1677 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1678 /* If -traditional, allow `unsigned int' instead of `int'
1679 in the prototype. */
1680 && (! (flag_traditional
1681 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1682 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1684 errmsg = "prototype for `%s' follows and argument %d";
1690 error_with_decl (newdecl, errmsg, nargs);
1691 error_with_decl (olddecl,
1692 "doesn't match non-prototype definition here");
1696 warning_with_decl (newdecl, "prototype for `%s' follows");
1697 warning_with_decl (olddecl, "non-prototype definition here");
1700 /* Warn about mismatches in various flags. */
1703 /* Warn if function is now inline
1704 but was previously declared not inline and has been called. */
1705 if (TREE_CODE (olddecl) == FUNCTION_DECL
1706 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1707 && TREE_USED (olddecl))
1708 warning_with_decl (newdecl,
1709 "`%s' declared inline after being called");
1710 if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1712 && DECL_INITIAL (olddecl) != 0)
1713 warning_with_decl (newdecl,
1714 "`%s' declared inline after its definition");
1716 /* If pedantic, warn when static declaration follows a non-static
1717 declaration. Otherwise, do so only for functions. */
1718 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1719 && TREE_PUBLIC (olddecl)
1720 && !TREE_PUBLIC (newdecl))
1721 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1723 /* Warn when const declaration follows a non-const
1724 declaration, but not for functions. */
1725 if (TREE_CODE (olddecl) != FUNCTION_DECL
1726 && !TREE_READONLY (olddecl)
1727 && TREE_READONLY (newdecl))
1728 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1729 /* These bits are logically part of the type, for variables.
1730 But not for functions
1731 (where qualifiers are not valid ANSI anyway). */
1732 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1733 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1734 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1735 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1739 /* Optionally warn about more than one declaration for the same name. */
1740 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1741 /* Dont warn about a function declaration
1742 followed by a definition. */
1743 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1744 && DECL_INITIAL (olddecl) == 0)
1745 /* Don't warn about extern decl followed by (tentative) definition. */
1746 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1748 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1749 warning_with_decl (olddecl, "previous declaration of `%s'");
1752 /* Copy all the DECL_... slots specified in the new decl
1753 except for any that we copy here from the old type.
1755 Past this point, we don't change OLDTYPE and NEWTYPE
1756 even if we change the types of NEWDECL and OLDDECL. */
1760 /* When copying info to olddecl, we store into write_olddecl
1761 instead. This allows us to avoid modifying olddecl when
1762 different_binding_level is true. */
1763 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1765 /* Make sure we put the new type in the same obstack as the old ones.
1766 If the old types are not both in the same obstack, use the permanent
1768 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1769 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1772 push_obstacks_nochange ();
1773 end_temporary_allocation ();
1776 /* Merge the data types specified in the two decls. */
1777 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1779 if (different_binding_level)
1781 = build_type_attribute_variant
1783 merge_attributes (TYPE_ATTRIBUTES (newtype),
1784 TYPE_ATTRIBUTES (oldtype)));
1787 = TREE_TYPE (olddecl)
1788 = common_type (newtype, oldtype);
1791 /* Lay the type out, unless already done. */
1792 if (oldtype != TREE_TYPE (newdecl))
1794 if (TREE_TYPE (newdecl) != error_mark_node)
1795 layout_type (TREE_TYPE (newdecl));
1796 if (TREE_CODE (newdecl) != FUNCTION_DECL
1797 && TREE_CODE (newdecl) != TYPE_DECL
1798 && TREE_CODE (newdecl) != CONST_DECL)
1799 layout_decl (newdecl, 0);
1803 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1804 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1805 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1806 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1807 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1810 /* Keep the old rtl since we can safely use it. */
1811 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1813 /* Merge the type qualifiers. */
1814 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1815 && !TREE_THIS_VOLATILE (newdecl))
1816 TREE_THIS_VOLATILE (write_olddecl) = 0;
1817 if (TREE_READONLY (newdecl))
1818 TREE_READONLY (write_olddecl) = 1;
1819 if (TREE_THIS_VOLATILE (newdecl))
1821 TREE_THIS_VOLATILE (write_olddecl) = 1;
1822 if (TREE_CODE (newdecl) == VAR_DECL)
1823 make_var_volatile (newdecl);
1826 /* Keep source location of definition rather than declaration. */
1827 /* When called with different_binding_level set, keep the old
1828 information so that meaningful diagnostics can be given. */
1829 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1830 && ! different_binding_level)
1832 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1833 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1836 /* Merge the unused-warning information. */
1837 if (DECL_IN_SYSTEM_HEADER (olddecl))
1838 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1839 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1840 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1842 /* Merge the initialization information. */
1843 /* When called with different_binding_level set, don't copy over
1844 DECL_INITIAL, so that we don't accidentally change function
1845 declarations into function definitions. */
1846 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1847 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1849 /* Merge the section attribute.
1850 We want to issue an error if the sections conflict but that must be
1851 done later in decl_attributes since we are called before attributes
1853 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1854 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1856 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1858 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1859 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1864 /* If cannot merge, then use the new type and qualifiers,
1865 and don't preserve the old rtl. */
1866 else if (! different_binding_level)
1868 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1869 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1870 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1871 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1874 /* Merge the storage class information. */
1875 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1876 /* For functions, static overrides non-static. */
1877 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1879 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1880 /* This is since we don't automatically
1881 copy the attributes of NEWDECL into OLDDECL. */
1882 /* No need to worry about different_binding_level here because
1883 then TREE_PUBLIC (newdecl) was true. */
1884 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1885 /* If this clears `static', clear it in the identifier too. */
1886 if (! TREE_PUBLIC (olddecl))
1887 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1889 if (DECL_EXTERNAL (newdecl))
1891 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1892 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1893 /* An extern decl does not override previous storage class. */
1894 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1895 if (! DECL_EXTERNAL (newdecl))
1896 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1900 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1901 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1904 /* If either decl says `inline', this fn is inline,
1905 unless its definition was passed already. */
1906 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1907 DECL_INLINE (olddecl) = 1;
1908 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1910 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1912 if (DECL_BUILT_IN (olddecl))
1914 /* Get rid of any built-in function if new arg types don't match it
1915 or if we have a function definition. */
1916 if (! types_match || new_is_definition)
1918 if (! different_binding_level)
1920 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1921 DECL_BUILT_IN (olddecl) = 0;
1926 /* If redeclaring a builtin function, and not a definition,
1927 it stays built in. */
1928 DECL_BUILT_IN (newdecl) = 1;
1929 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1932 /* Also preserve various other info from the definition. */
1933 else if (! new_is_definition)
1934 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1935 if (! new_is_definition)
1937 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1938 /* When called with different_binding_level set, don't copy over
1939 DECL_INITIAL, so that we don't accidentally change function
1940 declarations into function definitions. */
1941 if (! different_binding_level)
1942 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1943 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1944 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1947 if (different_binding_level)
1949 /* Don't output a duplicate symbol for this declaration. */
1950 TREE_ASM_WRITTEN (newdecl) = 1;
1954 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1955 But preserve OLDdECL's DECL_UID. */
1957 register unsigned olddecl_uid = DECL_UID (olddecl);
1959 bcopy ((char *) newdecl + sizeof (struct tree_common),
1960 (char *) olddecl + sizeof (struct tree_common),
1961 sizeof (struct tree_decl) - sizeof (struct tree_common));
1962 DECL_UID (olddecl) = olddecl_uid;
1968 /* Record a decl-node X as belonging to the current lexical scope.
1969 Check for errors (such as an incompatible declaration for the same
1970 name already seen in the same scope).
1972 Returns either X or an old decl for the same name.
1973 If an old decl is returned, it may have been smashed
1974 to agree with what X says. */
1981 register tree name = DECL_NAME (x);
1982 register struct binding_level *b = current_binding_level;
1984 DECL_CONTEXT (x) = current_function_decl;
1985 /* A local extern declaration for a function doesn't constitute nesting.
1986 A local auto declaration does, since it's a forward decl
1987 for a nested function coming later. */
1988 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1989 && DECL_EXTERNAL (x))
1990 DECL_CONTEXT (x) = 0;
1992 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1993 && x != IDENTIFIER_IMPLICIT_DECL (name)
1994 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1995 && !DECL_IN_SYSTEM_HEADER (x))
1996 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2002 int different_binding_level = 0;
2004 t = lookup_name_current_level (name);
2005 /* Don't type check externs here when -traditional. This is so that
2006 code with conflicting declarations inside blocks will get warnings
2007 not errors. X11 for instance depends on this. */
2008 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2010 t = IDENTIFIER_GLOBAL_VALUE (name);
2011 /* Type decls at global scope don't conflict with externs declared
2012 inside lexical blocks. */
2013 if (t && TREE_CODE (t) == TYPE_DECL)
2015 different_binding_level = 1;
2017 if (t != 0 && t == error_mark_node)
2018 /* error_mark_node is 0 for a while during initialization! */
2021 error_with_decl (x, "`%s' used prior to declaration");
2026 file = DECL_SOURCE_FILE (t);
2027 line = DECL_SOURCE_LINE (t);
2030 /* If this decl is `static' and an implicit decl was seen previously,
2031 warn. But don't complain if -traditional,
2032 since traditional compilers don't complain. */
2033 if (! flag_traditional && TREE_PUBLIC (name)
2034 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2035 sets this for all functions. */
2036 && ! TREE_PUBLIC (x)
2037 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2038 /* We used to warn also for explicit extern followed by static,
2039 but sometimes you need to do it that way. */
2040 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2042 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2043 IDENTIFIER_POINTER (name));
2044 pedwarn_with_file_and_line
2045 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2046 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2047 "previous declaration of `%s'",
2048 IDENTIFIER_POINTER (name));
2051 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2053 if (TREE_CODE (t) == PARM_DECL)
2055 /* Don't allow more than one "real" duplicate
2056 of a forward parm decl. */
2057 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2063 /* If we are processing a typedef statement, generate a whole new
2064 ..._TYPE node (which will be just an variant of the existing
2065 ..._TYPE node with identical properties) and then install the
2066 TYPE_DECL node generated to represent the typedef name as the
2067 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2069 The whole point here is to end up with a situation where each
2070 and every ..._TYPE node the compiler creates will be uniquely
2071 associated with AT MOST one node representing a typedef name.
2072 This way, even though the compiler substitutes corresponding
2073 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2074 early on, later parts of the compiler can always do the reverse
2075 translation and get back the corresponding typedef name. For
2078 typedef struct S MY_TYPE;
2081 Later parts of the compiler might only know that `object' was of
2082 type `struct S' if if were not for code just below. With this
2083 code however, later parts of the compiler see something like:
2085 struct S' == struct S
2086 typedef struct S' MY_TYPE;
2089 And they can then deduce (from the node for type struct S') that
2090 the original object declaration was:
2094 Being able to do this is important for proper support of protoize,
2095 and also for generating precise symbolic debugging information
2096 which takes full account of the programmer's (typedef) vocabulary.
2098 Obviously, we don't want to generate a duplicate ..._TYPE node if
2099 the TYPE_DECL node that we are now processing really represents a
2100 standard built-in type.
2102 Since all standard types are effectively declared at line zero
2103 in the source file, we can easily check to see if we are working
2104 on a standard type by checking the current value of lineno. */
2106 if (TREE_CODE (x) == TYPE_DECL)
2108 if (DECL_SOURCE_LINE (x) == 0)
2110 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2111 TYPE_NAME (TREE_TYPE (x)) = x;
2113 else if (TREE_TYPE (x) != error_mark_node)
2115 tree tt = TREE_TYPE (x);
2116 DECL_ORIGINAL_TYPE (x) = tt;
2117 tt = build_type_copy (tt);
2123 /* Multiple external decls of the same identifier ought to match.
2124 Check against both global declarations (when traditional) and out of
2125 scope (limbo) block level declarations.
2127 We get warnings about inline functions where they are defined.
2128 Avoid duplicate warnings where they are used. */
2129 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2133 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2134 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2135 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2136 decl = IDENTIFIER_GLOBAL_VALUE (name);
2137 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2138 /* Decls in limbo are always extern, so no need to check that. */
2139 decl = IDENTIFIER_LIMBO_VALUE (name);
2143 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2144 /* If old decl is built-in, we already warned if we should. */
2145 && !DECL_BUILT_IN (decl))
2147 pedwarn_with_decl (x,
2148 "type mismatch with previous external decl");
2149 pedwarn_with_decl (decl, "previous external decl of `%s'");
2153 /* If a function has had an implicit declaration, and then is defined,
2154 make sure they are compatible. */
2156 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2157 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2158 && TREE_CODE (x) == FUNCTION_DECL
2159 && ! comptypes (TREE_TYPE (x),
2160 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2162 warning_with_decl (x, "type mismatch with previous implicit declaration");
2163 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2164 "previous implicit declaration of `%s'");
2167 /* In PCC-compatibility mode, extern decls of vars with no current decl
2168 take effect at top level no matter where they are. */
2169 if (flag_traditional && DECL_EXTERNAL (x)
2170 && lookup_name (name) == 0)
2172 tree type = TREE_TYPE (x);
2174 /* But don't do this if the type contains temporary nodes. */
2177 if (type == error_mark_node)
2179 if (! TREE_PERMANENT (type))
2181 warning_with_decl (x, "type of external `%s' is not global");
2182 /* By exiting the loop early, we leave TYPE nonzero,
2183 and thus prevent globalization of the decl. */
2186 else if (TREE_CODE (type) == FUNCTION_TYPE
2187 && TYPE_ARG_TYPES (type) != 0)
2188 /* The types might not be truly local,
2189 but the list of arg types certainly is temporary.
2190 Since prototypes are nontraditional,
2191 ok not to do the traditional thing. */
2193 type = TREE_TYPE (type);
2197 b = global_binding_level;
2200 /* This name is new in its binding level.
2201 Install the new declaration and return it. */
2202 if (b == global_binding_level)
2204 /* Install a global value. */
2206 /* If the first global decl has external linkage,
2207 warn if we later see static one. */
2208 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2209 TREE_PUBLIC (name) = 1;
2211 IDENTIFIER_GLOBAL_VALUE (name) = x;
2213 /* We no longer care about any previous block level declarations. */
2214 IDENTIFIER_LIMBO_VALUE (name) = 0;
2216 /* Don't forget if the function was used via an implicit decl. */
2217 if (IDENTIFIER_IMPLICIT_DECL (name)
2218 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2219 TREE_USED (x) = 1, TREE_USED (name) = 1;
2221 /* Don't forget if its address was taken in that way. */
2222 if (IDENTIFIER_IMPLICIT_DECL (name)
2223 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2224 TREE_ADDRESSABLE (x) = 1;
2226 /* Warn about mismatches against previous implicit decl. */
2227 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2228 /* If this real decl matches the implicit, don't complain. */
2229 && ! (TREE_CODE (x) == FUNCTION_DECL
2230 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2231 == integer_type_node)))
2232 pedwarn ("`%s' was previously implicitly declared to return `int'",
2233 IDENTIFIER_POINTER (name));
2235 /* If this decl is `static' and an `extern' was seen previously,
2236 that is erroneous. */
2237 if (TREE_PUBLIC (name)
2238 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2240 /* Okay to redeclare an ANSI built-in as static. */
2241 if (t != 0 && DECL_BUILT_IN (t))
2243 /* Okay to declare a non-ANSI built-in as anything. */
2244 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2246 /* Okay to have global type decl after an earlier extern
2247 declaration inside a lexical block. */
2248 else if (TREE_CODE (x) == TYPE_DECL)
2250 else if (IDENTIFIER_IMPLICIT_DECL (name))
2251 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2252 IDENTIFIER_POINTER (name));
2254 pedwarn ("`%s' was declared `extern' and later `static'",
2255 IDENTIFIER_POINTER (name));
2260 /* Here to install a non-global value. */
2261 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2262 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2263 IDENTIFIER_LOCAL_VALUE (name) = x;
2265 /* If this is an extern function declaration, see if we
2266 have a global definition or declaration for the function. */
2268 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2270 && TREE_CODE (x) == FUNCTION_DECL
2271 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2273 /* We have one. Their types must agree. */
2274 if (! comptypes (TREE_TYPE (x),
2275 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2276 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2279 /* Inner extern decl is inline if global one is.
2280 Copy enough to really inline it. */
2281 if (DECL_INLINE (oldglobal))
2283 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2284 DECL_INITIAL (x) = (current_function_decl == oldglobal
2285 ? 0 : DECL_INITIAL (oldglobal));
2286 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2287 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2288 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2289 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2290 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2291 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2293 /* Inner extern decl is built-in if global one is. */
2294 if (DECL_BUILT_IN (oldglobal))
2296 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2297 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2299 /* Keep the arg types from a file-scope fcn defn. */
2300 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2301 && DECL_INITIAL (oldglobal)
2302 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2303 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2307 #if 0 /* This case is probably sometimes the right thing to do. */
2308 /* If we have a local external declaration,
2309 then any file-scope declaration should not
2310 have been static. */
2311 if (oldlocal == 0 && oldglobal != 0
2312 && !TREE_PUBLIC (oldglobal)
2313 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2314 warning ("`%s' locally external but globally static",
2315 IDENTIFIER_POINTER (name));
2318 /* If we have a local external declaration,
2319 and no file-scope declaration has yet been seen,
2320 then if we later have a file-scope decl it must not be static. */
2322 && DECL_EXTERNAL (x)
2326 TREE_PUBLIC (name) = 1;
2328 /* Save this decl, so that we can do type checking against
2329 other decls after it falls out of scope.
2331 Only save it once. This prevents temporary decls created in
2332 expand_inline_function from being used here, since this
2333 will have been set when the inline function was parsed.
2334 It also helps give slightly better warnings. */
2335 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2336 IDENTIFIER_LIMBO_VALUE (name) = x;
2339 /* Warn if shadowing an argument at the top level of the body. */
2340 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2341 /* This warning doesn't apply to the parms of a nested fcn. */
2342 && ! current_binding_level->parm_flag
2343 /* Check that this is one level down from the parms. */
2344 && current_binding_level->level_chain->parm_flag
2345 /* Check that the decl being shadowed
2346 comes from the parm level, one level up. */
2347 && chain_member (oldlocal, current_binding_level->level_chain->names))
2349 if (TREE_CODE (oldlocal) == PARM_DECL)
2350 pedwarn ("declaration of `%s' shadows a parameter",
2351 IDENTIFIER_POINTER (name));
2353 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2354 IDENTIFIER_POINTER (name));
2357 /* Maybe warn if shadowing something else. */
2358 else if (warn_shadow && !DECL_EXTERNAL (x)
2359 /* No shadow warnings for internally generated vars. */
2360 && DECL_SOURCE_LINE (x) != 0
2361 /* No shadow warnings for vars made for inlining. */
2362 && ! DECL_FROM_INLINE (x))
2364 char *warnstring = 0;
2366 if (TREE_CODE (x) == PARM_DECL
2367 && current_binding_level->level_chain->parm_flag)
2368 /* Don't warn about the parm names in function declarator
2369 within a function declarator.
2370 It would be nice to avoid warning in any function
2371 declarator in a declaration, as opposed to a definition,
2372 but there is no way to tell it's not a definition. */
2374 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2375 warnstring = "declaration of `%s' shadows a parameter";
2376 else if (oldlocal != 0)
2377 warnstring = "declaration of `%s' shadows previous local";
2378 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2379 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2380 warnstring = "declaration of `%s' shadows global declaration";
2383 warning (warnstring, IDENTIFIER_POINTER (name));
2386 /* If storing a local value, there may already be one (inherited).
2387 If so, record it for restoration when this binding level ends. */
2389 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2392 /* Keep count of variables in this level with incomplete type. */
2393 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2397 /* Put decls on list in reverse order.
2398 We will reverse them later if necessary. */
2399 TREE_CHAIN (x) = b->names;
2405 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2408 pushdecl_top_level (x)
2412 register struct binding_level *b = current_binding_level;
2414 current_binding_level = global_binding_level;
2416 current_binding_level = b;
2420 /* Generate an implicit declaration for identifier FUNCTIONID
2421 as a function of type int (). Print a warning if appropriate. */
2424 implicitly_declare (functionid)
2428 int traditional_warning = 0;
2429 /* Only one "implicit declaration" warning per identifier. */
2430 int implicit_warning;
2432 /* Save the decl permanently so we can warn if definition follows. */
2433 push_obstacks_nochange ();
2434 end_temporary_allocation ();
2436 /* We used to reuse an old implicit decl here,
2437 but this loses with inline functions because it can clobber
2438 the saved decl chains. */
2439 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2440 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2442 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2444 /* Warn of implicit decl following explicit local extern decl.
2445 This is probably a program designed for traditional C. */
2446 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2447 traditional_warning = 1;
2449 /* Warn once of an implicit declaration. */
2450 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2452 DECL_EXTERNAL (decl) = 1;
2453 TREE_PUBLIC (decl) = 1;
2454 DECL_ARTIFICIAL (decl);
2456 /* Record that we have an implicit decl and this is it. */
2457 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2459 /* ANSI standard says implicit declarations are in the innermost block.
2460 So we record the decl in the standard fashion.
2461 If flag_traditional is set, pushdecl does it top-level. */
2464 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2465 maybe_objc_check_decl (decl);
2467 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2469 if (warn_implicit && implicit_warning)
2470 warning ("implicit declaration of function `%s'",
2471 IDENTIFIER_POINTER (functionid));
2472 else if (warn_traditional && traditional_warning)
2473 warning ("function `%s' was previously declared within a block",
2474 IDENTIFIER_POINTER (functionid));
2476 /* Write a record describing this implicit function declaration to the
2477 prototypes file (if requested). */
2479 gen_aux_info_record (decl, 0, 1, 0);
2486 /* Return zero if the declaration NEWDECL is valid
2487 when the declaration OLDDECL (assumed to be for the same name)
2488 has already been seen.
2489 Otherwise return an error message format string with a %s
2490 where the identifier should go. */
2493 redeclaration_error_message (newdecl, olddecl)
2494 tree newdecl, olddecl;
2496 if (TREE_CODE (newdecl) == TYPE_DECL)
2498 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2500 /* pushdecl creates distinct types for TYPE_DECLs by calling
2501 build_type_copy, so the above comparison generally fails. We do
2502 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2503 is equivalent to what this code used to do before the build_type_copy
2504 call. The variant type distinction should not matter for traditional
2505 code, because it doesn't have type qualifiers. */
2506 if (flag_traditional
2507 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2509 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2511 return "redefinition of `%s'";
2513 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2515 /* Declarations of functions can insist on internal linkage
2516 but they can't be inconsistent with internal linkage,
2517 so there can be no error on that account.
2518 However defining the same name twice is no good. */
2519 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2520 /* However, defining once as extern inline and a second
2521 time in another way is ok. */
2522 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2523 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2524 return "redefinition of `%s'";
2527 else if (current_binding_level == global_binding_level)
2529 /* Objects declared at top level: */
2530 /* If at least one is a reference, it's ok. */
2531 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2533 /* Reject two definitions. */
2534 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2535 return "redefinition of `%s'";
2536 /* Now we have two tentative defs, or one tentative and one real def. */
2537 /* Insist that the linkage match. */
2538 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2539 return "conflicting declarations of `%s'";
2542 else if (current_binding_level->parm_flag
2543 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2547 /* Newdecl has block scope. If olddecl has block scope also, then
2548 reject two definitions, and reject a definition together with an
2549 external reference. Otherwise, it is OK, because newdecl must
2550 be an extern reference to olddecl. */
2551 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2552 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2553 return "redeclaration of `%s'";
2558 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2559 Create one if none exists so far for the current function.
2560 This function is called for both label definitions and label references. */
2566 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2568 if (current_function_decl == 0)
2570 error ("label %s referenced outside of any function",
2571 IDENTIFIER_POINTER (id));
2575 /* Use a label already defined or ref'd with this name. */
2578 /* But not if it is inherited and wasn't declared to be inheritable. */
2579 if (DECL_CONTEXT (decl) != current_function_decl
2580 && ! C_DECLARED_LABEL_FLAG (decl))
2581 return shadow_label (id);
2585 decl = build_decl (LABEL_DECL, id, void_type_node);
2587 /* Make sure every label has an rtx. */
2590 /* A label not explicitly declared must be local to where it's ref'd. */
2591 DECL_CONTEXT (decl) = current_function_decl;
2593 DECL_MODE (decl) = VOIDmode;
2595 /* Say where one reference is to the label,
2596 for the sake of the error if it is not defined. */
2597 DECL_SOURCE_LINE (decl) = lineno;
2598 DECL_SOURCE_FILE (decl) = input_filename;
2600 IDENTIFIER_LABEL_VALUE (id) = decl;
2602 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2607 /* Make a label named NAME in the current function,
2608 shadowing silently any that may be inherited from containing functions
2609 or containing scopes.
2611 Note that valid use, if the label being shadowed
2612 comes from another scope in the same function,
2613 requires calling declare_nonlocal_label right away. */
2619 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2625 /* Check to make sure that the label hasn't already been declared
2626 at this label scope */
2627 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2628 if (TREE_VALUE (dup) == decl)
2630 error ("duplicate label declaration `%s'",
2631 IDENTIFIER_POINTER (name));
2632 error_with_decl (TREE_VALUE (dup),
2633 "this is a previous declaration");
2634 /* Just use the previous declaration. */
2635 return lookup_label (name);
2638 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2639 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2642 return lookup_label (name);
2645 /* Define a label, specifying the location in the source file.
2646 Return the LABEL_DECL node for the label, if the definition is valid.
2647 Otherwise return 0. */
2650 define_label (filename, line, name)
2655 tree decl = lookup_label (name);
2657 /* If label with this name is known from an outer context, shadow it. */
2658 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2660 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2661 IDENTIFIER_LABEL_VALUE (name) = 0;
2662 decl = lookup_label (name);
2665 if (DECL_INITIAL (decl) != 0)
2667 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2672 /* Mark label as having been defined. */
2673 DECL_INITIAL (decl) = error_mark_node;
2674 /* Say where in the source. */
2675 DECL_SOURCE_FILE (decl) = filename;
2676 DECL_SOURCE_LINE (decl) = line;
2681 /* Return the list of declarations of the current level.
2682 Note that this list is in reverse order unless/until
2683 you nreverse it; and when you do nreverse it, you must
2684 store the result back using `storedecls' or you will lose. */
2689 return current_binding_level->names;
2692 /* Return the list of type-tags (for structs, etc) of the current level. */
2697 return current_binding_level->tags;
2700 /* Store the list of declarations of the current level.
2701 This is done for the parameter declarations of a function being defined,
2702 after they are modified in the light of any missing parameters. */
2708 current_binding_level->names = decls;
2711 /* Similarly, store the list of tags of the current level. */
2717 current_binding_level->tags = tags;
2720 /* Given NAME, an IDENTIFIER_NODE,
2721 return the structure (or union or enum) definition for that name.
2722 Searches binding levels from BINDING_LEVEL up to the global level.
2723 If THISLEVEL_ONLY is nonzero, searches only the specified context
2724 (but skips any tag-transparent contexts to find one that is
2725 meaningful for tags).
2726 CODE says which kind of type the caller wants;
2727 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2728 If the wrong kind of type is found, an error is reported. */
2731 lookup_tag (code, name, binding_level, thislevel_only)
2732 enum tree_code code;
2733 struct binding_level *binding_level;
2737 register struct binding_level *level;
2739 for (level = binding_level; level; level = level->level_chain)
2742 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2744 if (TREE_PURPOSE (tail) == name)
2746 if (TREE_CODE (TREE_VALUE (tail)) != code)
2748 /* Definition isn't the kind we were looking for. */
2749 pending_invalid_xref = name;
2750 pending_invalid_xref_file = input_filename;
2751 pending_invalid_xref_line = lineno;
2753 return TREE_VALUE (tail);
2756 if (thislevel_only && ! level->tag_transparent)
2762 /* Print an error message now
2763 for a recent invalid struct, union or enum cross reference.
2764 We don't print them immediately because they are not invalid
2765 when used in the `struct foo;' construct for shadowing. */
2768 pending_xref_error ()
2770 if (pending_invalid_xref != 0)
2771 error_with_file_and_line (pending_invalid_xref_file,
2772 pending_invalid_xref_line,
2773 "`%s' defined as wrong kind of tag",
2774 IDENTIFIER_POINTER (pending_invalid_xref));
2775 pending_invalid_xref = 0;
2778 /* Given a type, find the tag that was defined for it and return the tag name.
2779 Otherwise return 0. */
2782 lookup_tag_reverse (type)
2785 register struct binding_level *level;
2787 for (level = current_binding_level; level; level = level->level_chain)
2790 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2792 if (TREE_VALUE (tail) == type)
2793 return TREE_PURPOSE (tail);
2799 /* Look up NAME in the current binding level and its superiors
2800 in the namespace of variables, functions and typedefs.
2801 Return a ..._DECL node of some kind representing its definition,
2802 or return 0 if it is undefined. */
2809 if (current_binding_level != global_binding_level
2810 && IDENTIFIER_LOCAL_VALUE (name))
2811 val = IDENTIFIER_LOCAL_VALUE (name);
2813 val = IDENTIFIER_GLOBAL_VALUE (name);
2817 /* Similar to `lookup_name' but look only at current binding level. */
2820 lookup_name_current_level (name)
2825 if (current_binding_level == global_binding_level)
2826 return IDENTIFIER_GLOBAL_VALUE (name);
2828 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2831 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2832 if (DECL_NAME (t) == name)
2838 /* Create the predefined scalar types of C,
2839 and some nodes representing standard constants (0, 1, (void *) 0).
2840 Initialize the global binding level.
2841 Make definitions for built-in primitive functions. */
2844 init_decl_processing ()
2846 register tree endlink;
2847 /* Either char* or void*. */
2848 tree traditional_ptr_type_node;
2849 /* Data types of memcpy and strlen. */
2850 tree memcpy_ftype, memset_ftype, strlen_ftype;
2851 tree void_ftype_any;
2852 int wchar_type_size;
2854 tree array_domain_type;
2856 current_function_decl = NULL;
2857 named_labels = NULL;
2858 current_binding_level = NULL_BINDING_LEVEL;
2859 free_binding_level = NULL_BINDING_LEVEL;
2860 pushlevel (0); /* make the binding_level structure for global names */
2861 global_binding_level = current_binding_level;
2863 /* Define `int' and `char' first so that dbx will output them first. */
2865 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2866 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2867 integer_type_node));
2869 /* Define `char', which is like either `signed char' or `unsigned char'
2870 but not the same as either. */
2874 ? make_signed_type (CHAR_TYPE_SIZE)
2875 : make_unsigned_type (CHAR_TYPE_SIZE));
2876 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2879 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2880 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2881 long_integer_type_node));
2883 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2884 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2885 unsigned_type_node));
2887 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2888 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2889 long_unsigned_type_node));
2891 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2892 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2893 long_long_integer_type_node));
2895 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2896 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2897 long_long_unsigned_type_node));
2899 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2900 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2901 short_integer_type_node));
2903 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2904 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2905 short_unsigned_type_node));
2907 /* `unsigned long' is the standard type for sizeof.
2908 Traditionally, use a signed type.
2909 Note that stddef.h uses `unsigned long',
2910 and this must agree, even of long and int are the same size. */
2912 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2913 if (flag_traditional && TREE_UNSIGNED (sizetype))
2914 sizetype = signed_type (sizetype);
2917 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2919 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2920 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2921 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2922 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2923 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2924 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2925 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2926 TREE_TYPE (TYPE_SIZE (short_integer_type_node)) = sizetype;
2927 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node)) = sizetype;
2929 error_mark_node = make_node (ERROR_MARK);
2930 TREE_TYPE (error_mark_node) = error_mark_node;
2932 /* Define both `signed char' and `unsigned char'. */
2933 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2934 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2935 signed_char_type_node));
2937 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2938 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2939 unsigned_char_type_node));
2941 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2942 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2944 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2945 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2947 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2948 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2950 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2951 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2953 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2954 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2956 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2957 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2959 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2960 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2962 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2963 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2965 float_type_node = make_node (REAL_TYPE);
2966 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2967 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2969 layout_type (float_type_node);
2971 double_type_node = make_node (REAL_TYPE);
2972 if (flag_short_double)
2973 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2975 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2976 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2978 layout_type (double_type_node);
2980 long_double_type_node = make_node (REAL_TYPE);
2981 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2983 long_double_type_node));
2984 layout_type (long_double_type_node);
2986 complex_integer_type_node = make_node (COMPLEX_TYPE);
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2988 complex_integer_type_node));
2989 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2990 layout_type (complex_integer_type_node);
2992 complex_float_type_node = make_node (COMPLEX_TYPE);
2993 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2994 complex_float_type_node));
2995 TREE_TYPE (complex_float_type_node) = float_type_node;
2996 layout_type (complex_float_type_node);
2998 complex_double_type_node = make_node (COMPLEX_TYPE);
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3000 complex_double_type_node));
3001 TREE_TYPE (complex_double_type_node) = double_type_node;
3002 layout_type (complex_double_type_node);
3004 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3005 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3006 complex_long_double_type_node));
3007 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3008 layout_type (complex_long_double_type_node);
3011 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3012 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3013 signed_wchar_type_node = signed_type (wchar_type_node);
3014 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3016 integer_zero_node = build_int_2 (0, 0);
3017 TREE_TYPE (integer_zero_node) = integer_type_node;
3018 integer_one_node = build_int_2 (1, 0);
3019 TREE_TYPE (integer_one_node) = integer_type_node;
3021 boolean_type_node = integer_type_node;
3022 boolean_true_node = integer_one_node;
3023 boolean_false_node = integer_zero_node;
3025 size_zero_node = build_int_2 (0, 0);
3026 TREE_TYPE (size_zero_node) = sizetype;
3027 size_one_node = build_int_2 (1, 0);
3028 TREE_TYPE (size_one_node) = sizetype;
3030 void_type_node = make_node (VOID_TYPE);
3031 pushdecl (build_decl (TYPE_DECL,
3032 ridpointers[(int) RID_VOID], void_type_node));
3033 layout_type (void_type_node); /* Uses integer_zero_node */
3034 /* We are not going to have real types in C with less than byte alignment,
3035 so we might as well not have any types that claim to have it. */
3036 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3038 null_pointer_node = build_int_2 (0, 0);
3039 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3040 layout_type (TREE_TYPE (null_pointer_node));
3042 string_type_node = build_pointer_type (char_type_node);
3043 const_string_type_node
3044 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3046 /* Make a type to be the domain of a few array types
3047 whose domains don't really matter.
3048 200 is small enough that it always fits in size_t
3049 and large enough that it can hold most function names for the
3050 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3051 array_domain_type = build_index_type (build_int_2 (200, 0));
3053 /* make a type for arrays of characters.
3054 With luck nothing will ever really depend on the length of this
3056 char_array_type_node
3057 = build_array_type (char_type_node, array_domain_type);
3058 /* Likewise for arrays of ints. */
3060 = build_array_type (integer_type_node, array_domain_type);
3061 /* This is for wide string constants. */
3062 wchar_array_type_node
3063 = build_array_type (wchar_type_node, array_domain_type);
3065 default_function_type
3066 = build_function_type (integer_type_node, NULL_TREE);
3068 ptr_type_node = build_pointer_type (void_type_node);
3070 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3072 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3075 = build_function_type (void_type_node, NULL_TREE);
3078 = build_function_type (float_type_node,
3079 tree_cons (NULL_TREE, float_type_node, endlink));
3082 = build_function_type (double_type_node,
3083 tree_cons (NULL_TREE, double_type_node, endlink));
3085 ldouble_ftype_ldouble
3086 = build_function_type (long_double_type_node,
3087 tree_cons (NULL_TREE, long_double_type_node,
3090 double_ftype_double_double
3091 = build_function_type (double_type_node,
3092 tree_cons (NULL_TREE, double_type_node,
3093 tree_cons (NULL_TREE,
3094 double_type_node, endlink)));
3097 = build_function_type (integer_type_node,
3098 tree_cons (NULL_TREE, integer_type_node, endlink));
3101 = build_function_type (long_integer_type_node,
3102 tree_cons (NULL_TREE,
3103 long_integer_type_node, endlink));
3105 void_ftype_ptr_ptr_int
3106 = build_function_type (void_type_node,
3107 tree_cons (NULL_TREE, ptr_type_node,
3108 tree_cons (NULL_TREE, ptr_type_node,
3109 tree_cons (NULL_TREE,
3113 int_ftype_cptr_cptr_sizet
3114 = build_function_type (integer_type_node,
3115 tree_cons (NULL_TREE, const_ptr_type_node,
3116 tree_cons (NULL_TREE, const_ptr_type_node,
3117 tree_cons (NULL_TREE,
3121 void_ftype_ptr_int_int
3122 = build_function_type (void_type_node,
3123 tree_cons (NULL_TREE, ptr_type_node,
3124 tree_cons (NULL_TREE, integer_type_node,
3125 tree_cons (NULL_TREE,
3129 string_ftype_ptr_ptr /* strcpy prototype */
3130 = build_function_type (string_type_node,
3131 tree_cons (NULL_TREE, string_type_node,
3132 tree_cons (NULL_TREE,
3133 const_string_type_node,
3136 int_ftype_string_string /* strcmp prototype */
3137 = build_function_type (integer_type_node,
3138 tree_cons (NULL_TREE, const_string_type_node,
3139 tree_cons (NULL_TREE,
3140 const_string_type_node,
3143 strlen_ftype /* strlen prototype */
3144 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3145 tree_cons (NULL_TREE, const_string_type_node,
3148 traditional_ptr_type_node
3149 = (flag_traditional ? string_type_node : ptr_type_node);
3151 memcpy_ftype /* memcpy prototype */
3152 = build_function_type (traditional_ptr_type_node,
3153 tree_cons (NULL_TREE, ptr_type_node,
3154 tree_cons (NULL_TREE, const_ptr_type_node,
3155 tree_cons (NULL_TREE,
3159 memset_ftype /* memset prototype */
3160 = build_function_type (traditional_ptr_type_node,
3161 tree_cons (NULL_TREE, ptr_type_node,
3162 tree_cons (NULL_TREE, integer_type_node,
3163 tree_cons (NULL_TREE,
3167 builtin_function ("__builtin_constant_p", default_function_type,
3168 BUILT_IN_CONSTANT_P, NULL_PTR);
3170 builtin_function ("__builtin_return_address",
3171 build_function_type (ptr_type_node,
3172 tree_cons (NULL_TREE,
3175 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3177 builtin_function ("__builtin_frame_address",
3178 build_function_type (ptr_type_node,
3179 tree_cons (NULL_TREE,
3182 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3184 builtin_function ("__builtin_alloca",
3185 build_function_type (ptr_type_node,
3186 tree_cons (NULL_TREE,
3189 BUILT_IN_ALLOCA, "alloca");
3190 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3191 /* Define alloca, ffs as builtins.
3192 Declare _exit just to mark it as volatile. */
3193 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3195 temp = builtin_function ("alloca",
3196 build_function_type (ptr_type_node,
3197 tree_cons (NULL_TREE,
3200 BUILT_IN_ALLOCA, NULL_PTR);
3201 /* Suppress error if redefined as a non-function. */
3202 DECL_BUILT_IN_NONANSI (temp) = 1;
3203 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3204 /* Suppress error if redefined as a non-function. */
3205 DECL_BUILT_IN_NONANSI (temp) = 1;
3206 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3208 TREE_THIS_VOLATILE (temp) = 1;
3209 TREE_SIDE_EFFECTS (temp) = 1;
3210 /* Suppress error if redefined as a non-function. */
3211 DECL_BUILT_IN_NONANSI (temp) = 1;
3214 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3215 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3217 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3219 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3221 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3223 builtin_function ("__builtin_saveregs",
3224 build_function_type (ptr_type_node, NULL_TREE),
3225 BUILT_IN_SAVEREGS, NULL_PTR);
3226 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3228 builtin_function ("__builtin_varargs",
3229 build_function_type (ptr_type_node,
3230 tree_cons (NULL_TREE,
3233 BUILT_IN_VARARGS, NULL_PTR);
3235 builtin_function ("__builtin_classify_type", default_function_type,
3236 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3237 builtin_function ("__builtin_next_arg",
3238 build_function_type (ptr_type_node, NULL_TREE),
3239 BUILT_IN_NEXT_ARG, NULL_PTR);
3240 builtin_function ("__builtin_args_info",
3241 build_function_type (integer_type_node,
3242 tree_cons (NULL_TREE,
3245 BUILT_IN_ARGS_INFO, NULL_PTR);
3247 /* Untyped call and return. */
3248 builtin_function ("__builtin_apply_args",
3249 build_function_type (ptr_type_node, NULL_TREE),
3250 BUILT_IN_APPLY_ARGS, NULL_PTR);
3252 temp = tree_cons (NULL_TREE,
3253 build_pointer_type (build_function_type (void_type_node,
3255 tree_cons (NULL_TREE,
3257 tree_cons (NULL_TREE,
3260 builtin_function ("__builtin_apply",
3261 build_function_type (ptr_type_node, temp),
3262 BUILT_IN_APPLY, NULL_PTR);
3263 builtin_function ("__builtin_return",
3264 build_function_type (void_type_node,
3265 tree_cons (NULL_TREE,
3268 BUILT_IN_RETURN, NULL_PTR);
3270 /* Currently under experimentation. */
3271 builtin_function ("__builtin_memcpy", memcpy_ftype,
3272 BUILT_IN_MEMCPY, "memcpy");
3273 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3274 BUILT_IN_MEMCMP, "memcmp");
3275 builtin_function ("__builtin_memset", memset_ftype,
3276 BUILT_IN_MEMSET, NULL_PTR);
3277 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3278 BUILT_IN_STRCMP, "strcmp");
3279 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3280 BUILT_IN_STRCPY, "strcpy");
3281 builtin_function ("__builtin_strlen", strlen_ftype,
3282 BUILT_IN_STRLEN, "strlen");
3283 builtin_function ("__builtin_sqrtf", float_ftype_float,
3284 BUILT_IN_FSQRT, "sqrtf");
3285 builtin_function ("__builtin_fsqrt", double_ftype_double,
3286 BUILT_IN_FSQRT, "sqrt");
3287 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3288 BUILT_IN_FSQRT, "sqrtl");
3289 builtin_function ("__builtin_sinf", float_ftype_float,
3290 BUILT_IN_SIN, "sinf");
3291 builtin_function ("__builtin_sin", double_ftype_double,
3292 BUILT_IN_SIN, "sin");
3293 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3294 BUILT_IN_SIN, "sinl");
3295 builtin_function ("__builtin_cosf", float_ftype_float,
3296 BUILT_IN_COS, "cosf");
3297 builtin_function ("__builtin_cos", double_ftype_double,
3298 BUILT_IN_COS, "cos");
3299 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3300 BUILT_IN_COS, "cosl");
3301 builtin_function ("__builtin_setjmp",
3302 build_function_type (integer_type_node,
3303 tree_cons (NULL_TREE,
3304 ptr_type_node, endlink)),
3305 BUILT_IN_SETJMP, NULL_PTR);
3306 builtin_function ("__builtin_longjmp",
3309 tree_cons (NULL, ptr_type_node,
3310 tree_cons (NULL_TREE,
3313 BUILT_IN_LONGJMP, NULL_PTR);
3315 /* In an ANSI C program, it is okay to supply built-in meanings
3316 for these functions, since applications cannot validly use them
3317 with any other meaning.
3318 However, honor the -fno-builtin option. */
3319 if (!flag_no_builtin)
3321 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3322 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3323 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3324 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3326 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3327 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3328 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3330 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3331 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3333 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3335 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3336 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3337 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3338 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3340 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3341 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3342 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3343 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3344 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3345 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3347 /* Declare these functions volatile
3348 to avoid spurious "control drops through" warnings. */
3349 /* Don't specify the argument types, to avoid errors
3350 from certain code which isn't valid in ANSI but which exists. */
3351 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3353 TREE_THIS_VOLATILE (temp) = 1;
3354 TREE_SIDE_EFFECTS (temp) = 1;
3355 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3356 TREE_THIS_VOLATILE (temp) = 1;
3357 TREE_SIDE_EFFECTS (temp) = 1;
3361 /* Support for these has not been written in either expand_builtin
3362 or build_function_call. */
3363 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3364 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3365 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3367 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3369 builtin_function ("__builtin_fmod", double_ftype_double_double,
3370 BUILT_IN_FMOD, NULL_PTR);
3371 builtin_function ("__builtin_frem", double_ftype_double_double,
3372 BUILT_IN_FREM, NULL_PTR);
3373 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3374 BUILT_IN_MEMSET, NULL_PTR);
3375 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3377 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3381 pedantic_lvalues = pedantic;
3383 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3384 declare_function_name ();
3386 start_identifier_warnings ();
3388 /* Prepare to check format strings against argument lists. */
3389 init_function_format_info ();
3393 incomplete_decl_finalize_hook = finish_incomplete_decl;
3396 /* Return a definition for a builtin function named NAME and whose data type
3397 is TYPE. TYPE should be a function type with argument types.
3398 FUNCTION_CODE tells later passes how to compile calls to this function.
3399 See tree.h for its possible values.
3401 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3402 the name to be called if we can't opencode the function. */
3405 builtin_function (name, type, function_code, library_name)
3408 enum built_in_function function_code;
3411 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3412 DECL_EXTERNAL (decl) = 1;
3413 TREE_PUBLIC (decl) = 1;
3414 /* If -traditional, permit redefining a builtin function any way you like.
3415 (Though really, if the program redefines these functions,
3416 it probably won't work right unless compiled with -fno-builtin.) */
3417 if (flag_traditional && name[0] != '_')
3418 DECL_BUILT_IN_NONANSI (decl) = 1;
3420 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3421 make_decl_rtl (decl, NULL_PTR, 1);
3423 if (function_code != NOT_BUILT_IN)
3425 DECL_BUILT_IN (decl) = 1;
3426 DECL_FUNCTION_CODE (decl) = function_code;
3428 /* Warn if a function in the namespace for users
3429 is used without an occasion to consider it declared. */
3430 if (name[0] != '_' || name[1] != '_')
3431 C_DECL_ANTICIPATED (decl) = 1;
3436 /* Called when a declaration is seen that contains no names to declare.
3437 If its type is a reference to a structure, union or enum inherited
3438 from a containing scope, shadow that tag name for the current scope
3439 with a forward reference.
3440 If its type defines a new named structure or union
3441 or defines an enum, it is valid but we need not do anything here.
3442 Otherwise, it is an error. */
3445 shadow_tag (declspecs)
3448 shadow_tag_warned (declspecs, 0);
3452 shadow_tag_warned (declspecs, warned)
3455 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3461 pending_invalid_xref = 0;
3463 for (link = declspecs; link; link = TREE_CHAIN (link))
3465 register tree value = TREE_VALUE (link);
3466 register enum tree_code code = TREE_CODE (value);
3468 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3469 /* Used to test also that TYPE_SIZE (value) != 0.
3470 That caused warning for `struct foo;' at top level in the file. */
3472 register tree name = lookup_tag_reverse (value);
3479 if (warned != 1 && code != ENUMERAL_TYPE)
3480 /* Empty unnamed enum OK */
3482 pedwarn ("unnamed struct/union that defines no instances");
3488 t = lookup_tag (code, name, current_binding_level, 1);
3492 t = make_node (code);
3499 if (!warned && ! in_system_header)
3501 warning ("useless keyword or type name in empty declaration");
3508 error ("two types specified in one empty declaration");
3513 pedwarn ("empty declaration");
3517 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3520 groktypename (typename)
3523 if (TREE_CODE (typename) != TREE_LIST)
3525 return grokdeclarator (TREE_VALUE (typename),
3526 TREE_PURPOSE (typename),
3530 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3533 groktypename_in_parm_context (typename)
3536 if (TREE_CODE (typename) != TREE_LIST)
3538 return grokdeclarator (TREE_VALUE (typename),
3539 TREE_PURPOSE (typename),
3543 /* Decode a declarator in an ordinary declaration or data definition.
3544 This is called as soon as the type information and variable name
3545 have been parsed, before parsing the initializer if any.
3546 Here we create the ..._DECL node, fill in its type,
3547 and put it on the list of decls for the current context.
3548 The ..._DECL node is returned as the value.
3550 Exception: for arrays where the length is not specified,
3551 the type is left null, to be filled in by `finish_decl'.
3553 Function definitions do not come here; they go to start_function
3554 instead. However, external and forward declarations of functions
3555 do go through here. Structure field declarations are done by
3556 grokfield and not through here. */
3558 /* Set this to zero to debug not using the temporary obstack
3559 to parse initializers. */
3560 int debug_temp_inits = 1;
3563 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3564 tree declarator, declspecs;
3566 tree attributes, prefix_attributes;
3568 register tree decl = grokdeclarator (declarator, declspecs,
3569 NORMAL, initialized);
3571 int init_written = initialized;
3573 /* The corresponding pop_obstacks is in finish_decl. */
3574 push_obstacks_nochange ();
3576 if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
3577 warning_with_decl (decl, "`%s' is usually a function");
3580 /* Is it valid for this decl to have an initializer at all?
3581 If not, set INITIALIZED to zero, which will indirectly
3582 tell `finish_decl' to ignore the initializer once it is parsed. */
3583 switch (TREE_CODE (decl))
3586 /* typedef foo = bar means give foo the same type as bar.
3587 We haven't parsed bar yet, so `finish_decl' will fix that up.
3588 Any other case of an initialization in a TYPE_DECL is an error. */
3589 if (pedantic || list_length (declspecs) > 1)
3591 error ("typedef `%s' is initialized",
3592 IDENTIFIER_POINTER (DECL_NAME (decl)));
3598 error ("function `%s' is initialized like a variable",
3599 IDENTIFIER_POINTER (DECL_NAME (decl)));
3604 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3605 error ("parameter `%s' is initialized",
3606 IDENTIFIER_POINTER (DECL_NAME (decl)));
3611 /* Don't allow initializations for incomplete types
3612 except for arrays which might be completed by the initialization. */
3613 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3615 /* A complete type is ok if size is fixed. */
3617 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3618 || C_DECL_VARIABLE_SIZE (decl))
3620 error ("variable-sized object may not be initialized");
3624 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3626 error ("variable `%s' has initializer but incomplete type",
3627 IDENTIFIER_POINTER (DECL_NAME (decl)));
3630 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3632 error ("elements of array `%s' have incomplete type",
3633 IDENTIFIER_POINTER (DECL_NAME (decl)));
3640 #if 0 /* Seems redundant with grokdeclarator. */
3641 if (current_binding_level != global_binding_level
3642 && DECL_EXTERNAL (decl)
3643 && TREE_CODE (decl) != FUNCTION_DECL)
3644 warning ("declaration of `%s' has `extern' and is initialized",
3645 IDENTIFIER_POINTER (DECL_NAME (decl)));
3647 DECL_EXTERNAL (decl) = 0;
3648 if (current_binding_level == global_binding_level)
3649 TREE_STATIC (decl) = 1;
3651 /* Tell `pushdecl' this is an initialized decl
3652 even though we don't yet have the initializer expression.
3653 Also tell `finish_decl' it may store the real initializer. */
3654 DECL_INITIAL (decl) = error_mark_node;
3657 /* If this is a function declaration, write a record describing it to the
3658 prototypes file (if requested). */
3660 if (TREE_CODE (decl) == FUNCTION_DECL)
3661 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3663 /* ANSI specifies that a tentative definition which is not merged with
3664 a non-tentative definition behaves exactly like a definition with an
3665 initializer equal to zero. (Section 3.7.2)
3666 -fno-common gives strict ANSI behavior. Usually you don't want it.
3667 This matters only for variables with external linkage. */
3668 if (! flag_no_common || ! TREE_PUBLIC (decl))
3669 DECL_COMMON (decl) = 1;
3671 /* Set attributes here so if duplicate decl, will have proper attributes. */
3672 decl_attributes (decl, attributes, prefix_attributes);
3674 /* Add this decl to the current binding level.
3675 TEM may equal DECL or it may be a previous decl of the same name. */
3676 tem = pushdecl (decl);
3678 /* For a local variable, define the RTL now. */
3679 if (current_binding_level != global_binding_level
3680 /* But not if this is a duplicate decl
3681 and we preserved the rtl from the previous one
3682 (which may or may not happen). */
3683 && DECL_RTL (tem) == 0)
3685 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3687 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3688 && DECL_INITIAL (tem) != 0)
3694 /* When parsing and digesting the initializer,
3695 use temporary storage. Do this even if we will ignore the value. */
3696 if (current_binding_level == global_binding_level && debug_temp_inits)
3697 temporary_allocation ();
3703 /* Finish processing of a declaration;
3704 install its initial value.
3705 If the length of an array type is not known before,
3706 it must be determined now, from the initial value, or it is an error. */
3709 finish_decl (decl, init, asmspec_tree)
3713 register tree type = TREE_TYPE (decl);
3714 int was_incomplete = (DECL_SIZE (decl) == 0);
3715 int temporary = allocation_temporary_p ();
3718 /* If a name was specified, get the string. */
3720 asmspec = TREE_STRING_POINTER (asmspec_tree);
3722 /* If `start_decl' didn't like having an initialization, ignore it now. */
3724 if (init != 0 && DECL_INITIAL (decl) == 0)
3726 /* Don't crash if parm is initialized. */
3727 if (TREE_CODE (decl) == PARM_DECL)
3730 if (ITERATOR_P (decl))
3733 error_with_decl (decl, "iterator has no initial value");
3735 init = save_expr (init);
3740 if (TREE_CODE (decl) != TYPE_DECL)
3741 store_init_value (decl, init);
3744 /* typedef foo = bar; store the type of bar as the type of foo. */
3745 TREE_TYPE (decl) = TREE_TYPE (init);
3746 DECL_INITIAL (decl) = init = 0;
3750 /* Pop back to the obstack that is current for this binding level.
3751 This is because MAXINDEX, rtl, etc. to be made below
3752 must go in the permanent obstack. But don't discard the
3753 temporary data yet. */
3755 #if 0 /* pop_obstacks was near the end; this is what was here. */
3756 if (current_binding_level == global_binding_level && temporary)
3757 end_temporary_allocation ();
3760 /* Deduce size of array from initialization, if not already known */
3762 if (TREE_CODE (type) == ARRAY_TYPE
3763 && TYPE_DOMAIN (type) == 0
3764 && TREE_CODE (decl) != TYPE_DECL)
3767 = (TREE_STATIC (decl)
3768 /* Even if pedantic, an external linkage array
3769 may have incomplete type at first. */
3770 ? pedantic && !TREE_PUBLIC (decl)
3771 : !DECL_EXTERNAL (decl));
3773 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3775 /* Get the completed type made by complete_array_type. */
3776 type = TREE_TYPE (decl);
3779 error_with_decl (decl, "initializer fails to determine size of `%s'");
3784 error_with_decl (decl, "array size missing in `%s'");
3785 /* If a `static' var's size isn't known,
3786 make it extern as well as static, so it does not get
3788 If it is not `static', then do not mark extern;
3789 finish_incomplete_decl will give it a default size
3790 and it will get allocated. */
3791 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3792 DECL_EXTERNAL (decl) = 1;
3795 /* TYPE_MAX_VALUE is always one less than the number of elements
3796 in the array, because we start counting at zero. Therefore,
3797 warn only if the value is less than zero. */
3798 if (pedantic && TYPE_DOMAIN (type) != 0
3799 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3800 error_with_decl (decl, "zero or negative size array `%s'");
3802 layout_decl (decl, 0);
3805 if (TREE_CODE (decl) == VAR_DECL)
3807 if (DECL_SIZE (decl) == 0
3808 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3809 layout_decl (decl, 0);
3811 if (DECL_SIZE (decl) == 0
3812 && (TREE_STATIC (decl)
3814 /* A static variable with an incomplete type
3815 is an error if it is initialized.
3816 Also if it is not file scope.
3817 Otherwise, let it through, but if it is not `extern'
3818 then it may cause an error message later. */
3819 /* A duplicate_decls call could have changed an extern
3820 declaration into a file scope one. This can be detected
3821 by TREE_ASM_WRITTEN being set. */
3822 (DECL_INITIAL (decl) != 0
3823 || DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl))
3825 /* An automatic variable with an incomplete type
3827 !DECL_EXTERNAL (decl)))
3829 error_with_decl (decl, "storage size of `%s' isn't known");
3830 TREE_TYPE (decl) = error_mark_node;
3833 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3834 && DECL_SIZE (decl) != 0)
3836 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3837 constant_expression_warning (DECL_SIZE (decl));
3839 error_with_decl (decl, "storage size of `%s' isn't constant");
3843 /* If this is a function and an assembler name is specified, it isn't
3844 builtin any more. Also reset DECL_RTL so we can give it its new
3846 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3848 DECL_BUILT_IN (decl) = 0;
3849 DECL_RTL (decl) = 0;
3852 /* Output the assembler code and/or RTL code for variables and functions,
3853 unless the type is an undefined structure or union.
3854 If not, it will get done when the type is completed. */
3856 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3858 if ((flag_traditional || TREE_PERMANENT (decl))
3859 && allocation_temporary_p ())
3861 push_obstacks_nochange ();
3862 end_temporary_allocation ();
3863 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3864 maybe_objc_check_decl (decl);
3865 rest_of_decl_compilation (decl, asmspec,
3866 (DECL_CONTEXT (decl) == 0
3867 || TREE_ASM_WRITTEN (decl)),
3873 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3874 maybe_objc_check_decl (decl);
3875 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3878 if (DECL_CONTEXT (decl) != 0)
3880 /* Recompute the RTL of a local array now
3881 if it used to be an incomplete type. */
3883 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3885 /* If we used it already as memory, it must stay in memory. */
3886 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3887 /* If it's still incomplete now, no init will save it. */
3888 if (DECL_SIZE (decl) == 0)
3889 DECL_INITIAL (decl) = 0;
3892 /* Compute and store the initial value. */
3893 if (TREE_CODE (decl) != FUNCTION_DECL)
3894 expand_decl_init (decl);
3898 if (TREE_CODE (decl) == TYPE_DECL)
3900 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3901 maybe_objc_check_decl (decl);
3902 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3906 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3907 /* This test used to include TREE_PERMANENT, however, we have the same
3908 problem with initializers at the function level. Such initializers get
3909 saved until the end of the function on the momentary_obstack. */
3910 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3912 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3913 space with DECL_ARG_TYPE. */
3914 && TREE_CODE (decl) != PARM_DECL)
3916 /* We need to remember that this array HAD an initialization,
3917 but discard the actual temporary nodes,
3918 since we can't have a permanent node keep pointing to them. */
3919 /* We make an exception for inline functions, since it's
3920 normal for a local extern redeclaration of an inline function
3921 to have a copy of the top-level decl's DECL_INLINE. */
3922 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3924 /* If this is a const variable, then preserve the
3925 initializer instead of discarding it so that we can optimize
3926 references to it. */
3927 /* This test used to include TREE_STATIC, but this won't be set
3928 for function level initializers. */
3929 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3931 preserve_initializer ();
3932 /* Hack? Set the permanent bit for something that is permanent,
3933 but not on the permanent obstack, so as to convince
3934 output_constant_def to make its rtl on the permanent
3936 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3938 /* The initializer and DECL must have the same (or equivalent
3939 types), but if the initializer is a STRING_CST, its type
3940 might not be on the right obstack, so copy the type
3942 TREE_TYPE (DECL_INITIAL (decl)) = type;
3945 DECL_INITIAL (decl) = error_mark_node;
3949 /* If requested, warn about definitions of large data objects. */
3951 if (warn_larger_than
3952 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3953 && !DECL_EXTERNAL (decl))
3955 register tree decl_size = DECL_SIZE (decl);
3957 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3959 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3961 if (units > larger_than_size)
3962 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3967 /* Resume permanent allocation, if not within a function. */
3968 /* The corresponding push_obstacks_nochange is in start_decl,
3969 and in push_parm_decl and in grokfield. */
3973 /* If we have gone back from temporary to permanent allocation,
3974 actually free the temporary space that we no longer need. */
3975 if (temporary && !allocation_temporary_p ())
3976 permanent_allocation (0);
3978 /* At the end of a declaration, throw away any variable type sizes
3979 of types defined inside that declaration. There is no use
3980 computing them in the following function definition. */
3981 if (current_binding_level == global_binding_level)
3982 get_pending_sizes ();
3985 /* If DECL has a cleanup, build and return that cleanup here.
3986 This is a callback called by expand_expr. */
3989 maybe_build_cleanup (decl)
3992 /* There are no cleanups in C. */
3996 /* Given a parsed parameter declaration,
3997 decode it into a PARM_DECL and push that on the current binding level.
3998 Also, for the sake of forward parm decls,
3999 record the given order of parms in `parm_order'. */
4002 push_parm_decl (parm)
4006 int old_immediate_size_expand = immediate_size_expand;
4007 /* Don't try computing parm sizes now -- wait till fn is called. */
4008 immediate_size_expand = 0;
4010 /* The corresponding pop_obstacks is in finish_decl. */
4011 push_obstacks_nochange ();
4013 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4014 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4015 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4016 TREE_PURPOSE (TREE_VALUE (parm)));
4019 if (DECL_NAME (decl))
4022 olddecl = lookup_name (DECL_NAME (decl));
4023 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4024 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4028 decl = pushdecl (decl);
4030 immediate_size_expand = old_immediate_size_expand;
4032 current_binding_level->parm_order
4033 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4035 /* Add this decl to the current binding level. */
4036 finish_decl (decl, NULL_TREE, NULL_TREE);
4039 /* Clear the given order of parms in `parm_order'.
4040 Used at start of parm list,
4041 and also at semicolon terminating forward decls. */
4046 current_binding_level->parm_order = NULL_TREE;
4049 /* Make TYPE a complete type based on INITIAL_VALUE.
4050 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4051 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4054 complete_array_type (type, initial_value, do_default)
4059 register tree maxindex = NULL_TREE;
4064 /* Note MAXINDEX is really the maximum index,
4065 one less than the size. */
4066 if (TREE_CODE (initial_value) == STRING_CST)
4069 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4070 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4073 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4075 tree elts = CONSTRUCTOR_ELTS (initial_value);
4076 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4077 for (; elts; elts = TREE_CHAIN (elts))
4079 if (TREE_PURPOSE (elts))
4080 maxindex = TREE_PURPOSE (elts);
4082 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4084 maxindex = copy_node (maxindex);
4088 /* Make an error message unless that happened already. */
4089 if (initial_value != error_mark_node)
4092 /* Prevent further error messages. */
4093 maxindex = build_int_2 (0, 0);
4100 maxindex = build_int_2 (0, 0);
4106 TYPE_DOMAIN (type) = build_index_type (maxindex);
4107 if (!TREE_TYPE (maxindex))
4108 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4109 #if 0 /* I took out this change
4110 together with the change in build_array_type. --rms */
4111 change_main_variant (type,
4112 build_array_type (TREE_TYPE (type),
4113 TYPE_DOMAIN (type)));
4117 /* Lay out the type now that we can get the real answer. */
4124 /* Given declspecs and a declarator,
4125 determine the name and type of the object declared
4126 and construct a ..._DECL node for it.
4127 (In one case we can return a ..._TYPE node instead.
4128 For invalid input we sometimes return 0.)
4130 DECLSPECS is a chain of tree_list nodes whose value fields
4131 are the storage classes and type specifiers.
4133 DECL_CONTEXT says which syntactic context this declaration is in:
4134 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4135 FUNCDEF for a function definition. Like NORMAL but a few different
4136 error messages in each case. Return value may be zero meaning
4137 this definition is too screwy to try to parse.
4138 PARM for a parameter declaration (either within a function prototype
4139 or before a function body). Make a PARM_DECL, or return void_type_node.
4140 TYPENAME if for a typename (in a cast or sizeof).
4141 Don't make a DECL node; just return the ..._TYPE node.
4142 FIELD for a struct or union field; make a FIELD_DECL.
4143 BITFIELD for a field with specified width.
4144 INITIALIZED is 1 if the decl has an initializer.
4146 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4147 It may also be so in the PARM case, for a prototype where the
4148 argument type is specified but not the name.
4150 This function is where the complicated C meanings of `static'
4151 and `extern' are interpreted. */
4154 grokdeclarator (declarator, declspecs, decl_context, initialized)
4157 enum decl_context decl_context;
4162 tree type = NULL_TREE;
4167 int explicit_int = 0;
4168 int explicit_char = 0;
4169 int defaulted_int = 0;
4170 tree typedef_decl = 0;
4172 tree typedef_type = 0;
4173 int funcdef_flag = 0;
4174 enum tree_code innermost_code = ERROR_MARK;
4176 int size_varies = 0;
4177 tree decl_machine_attr = NULL_TREE;
4179 if (decl_context == BITFIELD)
4180 bitfield = 1, decl_context = FIELD;
4182 if (decl_context == FUNCDEF)
4183 funcdef_flag = 1, decl_context = NORMAL;
4185 push_obstacks_nochange ();
4187 if (flag_traditional && allocation_temporary_p ())
4188 end_temporary_allocation ();
4190 /* Look inside a declarator for the name being declared
4191 and get it as a string, for an error message. */
4193 register tree decl = declarator;
4197 switch (TREE_CODE (decl))
4202 innermost_code = TREE_CODE (decl);
4203 decl = TREE_OPERAND (decl, 0);
4206 case IDENTIFIER_NODE:
4207 name = IDENTIFIER_POINTER (decl);
4218 /* A function definition's declarator must have the form of
4219 a function declarator. */
4221 if (funcdef_flag && innermost_code != CALL_EXPR)
4224 /* Anything declared one level down from the top level
4225 must be one of the parameters of a function
4226 (because the body is at least two levels down). */
4228 /* If this looks like a function definition, make it one,
4229 even if it occurs where parms are expected.
4230 Then store_parm_decls will reject it and not use it as a parm. */
4231 if (decl_context == NORMAL && !funcdef_flag
4232 && current_binding_level->parm_flag)
4233 decl_context = PARM;
4235 /* Look through the decl specs and record which ones appear.
4236 Some typespecs are defined as built-in typenames.
4237 Others, the ones that are modifiers of other types,
4238 are represented by bits in SPECBITS: set the bits for
4239 the modifiers that appear. Storage class keywords are also in SPECBITS.
4241 If there is a typedef name or a type, store the type in TYPE.
4242 This includes builtin typedefs such as `int'.
4244 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4245 and did not come from a user typedef.
4247 Set LONGLONG if `long' is mentioned twice. */
4249 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4252 register tree id = TREE_VALUE (spec);
4254 if (id == ridpointers[(int) RID_INT])
4256 if (id == ridpointers[(int) RID_CHAR])
4259 if (TREE_CODE (id) == IDENTIFIER_NODE)
4260 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4262 if (ridpointers[i] == id)
4264 if (i == (int) RID_LONG && specbits & (1<<i))
4267 error ("`long long long' is too long for GCC");
4270 if (pedantic && ! in_system_header)
4271 pedwarn ("ANSI C does not support `long long'");
4275 else if (specbits & (1 << i))
4276 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4282 error ("two or more data types in declaration of `%s'", name);
4283 /* Actual typedefs come to us as TYPE_DECL nodes. */
4284 else if (TREE_CODE (id) == TYPE_DECL)
4286 type = TREE_TYPE (id);
4287 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4290 /* Built-in types come as identifiers. */
4291 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4293 register tree t = lookup_name (id);
4294 if (TREE_TYPE (t) == error_mark_node)
4296 else if (!t || TREE_CODE (t) != TYPE_DECL)
4297 error ("`%s' fails to be a typedef or built in type",
4298 IDENTIFIER_POINTER (id));
4301 type = TREE_TYPE (t);
4305 else if (TREE_CODE (id) != ERROR_MARK)
4311 typedef_type = type;
4313 size_varies = C_TYPE_VARIABLE_SIZE (type);
4315 /* No type at all: default to `int', and set DEFAULTED_INT
4316 because it was not a user-defined typedef. */
4320 if (! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4321 | (1 << (int) RID_SIGNED)
4322 | (1 << (int) RID_UNSIGNED))))
4324 /* C9x will probably require a diagnostic here.
4325 For now, issue a warning if -Wreturn-type and this is a function,
4326 or if -Wimplicit; prefer the former warning since it is more
4328 if ((warn_implicit || warn_return_type) && funcdef_flag)
4329 warn_about_return_type = 1;
4330 else if (warn_implicit)
4331 warning ("type defaults to `int' in declaration of `%s'", name);
4335 type = integer_type_node;
4338 /* Now process the modifiers that were specified
4339 and check for invalid combinations. */
4341 /* Long double is a special combination. */
4343 if ((specbits & 1 << (int) RID_LONG)
4344 && TYPE_MAIN_VARIANT (type) == double_type_node)
4346 specbits &= ~ (1 << (int) RID_LONG);
4347 type = long_double_type_node;
4350 /* Check all other uses of type modifiers. */
4352 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4353 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4357 if (TREE_CODE (type) != INTEGER_TYPE)
4358 error ("long, short, signed or unsigned invalid for `%s'", name);
4359 else if ((specbits & 1 << (int) RID_LONG)
4360 && (specbits & 1 << (int) RID_SHORT))
4361 error ("long and short specified together for `%s'", name);
4362 else if (((specbits & 1 << (int) RID_LONG)
4363 || (specbits & 1 << (int) RID_SHORT))
4365 error ("long or short specified with char for `%s'", name);
4366 else if (((specbits & 1 << (int) RID_LONG)
4367 || (specbits & 1 << (int) RID_SHORT))
4368 && TREE_CODE (type) == REAL_TYPE)
4369 error ("long or short specified with floating type for `%s'", name);
4370 else if ((specbits & 1 << (int) RID_SIGNED)
4371 && (specbits & 1 << (int) RID_UNSIGNED))
4372 error ("signed and unsigned given together for `%s'", name);
4376 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4378 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4380 if (flag_pedantic_errors)
4385 /* Discard the type modifiers if they are invalid. */
4388 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4389 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4394 if ((specbits & (1 << (int) RID_COMPLEX))
4395 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4397 error ("complex invalid for `%s'", name);
4398 specbits &= ~ (1 << (int) RID_COMPLEX);
4401 /* Decide whether an integer type is signed or not.
4402 Optionally treat bitfields as signed by default. */
4403 if (specbits & 1 << (int) RID_UNSIGNED
4404 /* Traditionally, all bitfields are unsigned. */
4405 || (bitfield && flag_traditional
4406 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4407 || (bitfield && ! flag_signed_bitfields
4408 && (explicit_int || defaulted_int || explicit_char
4409 /* A typedef for plain `int' without `signed'
4410 can be controlled just like plain `int'. */
4411 || ! (typedef_decl != 0
4412 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4413 && TREE_CODE (type) != ENUMERAL_TYPE
4414 && !(specbits & 1 << (int) RID_SIGNED)))
4417 type = long_long_unsigned_type_node;
4418 else if (specbits & 1 << (int) RID_LONG)
4419 type = long_unsigned_type_node;
4420 else if (specbits & 1 << (int) RID_SHORT)
4421 type = short_unsigned_type_node;
4422 else if (type == char_type_node)
4423 type = unsigned_char_type_node;
4424 else if (typedef_decl)
4425 type = unsigned_type (type);
4427 type = unsigned_type_node;
4429 else if ((specbits & 1 << (int) RID_SIGNED)
4430 && type == char_type_node)
4431 type = signed_char_type_node;
4433 type = long_long_integer_type_node;
4434 else if (specbits & 1 << (int) RID_LONG)
4435 type = long_integer_type_node;
4436 else if (specbits & 1 << (int) RID_SHORT)
4437 type = short_integer_type_node;
4439 if (specbits & 1 << (int) RID_COMPLEX)
4441 /* If we just have "complex", it is equivalent to
4442 "complex double", but if any modifiers at all are specified it is
4443 the complex form of TYPE. E.g, "complex short" is
4444 "complex short int". */
4446 if (defaulted_int && ! longlong
4447 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4448 | (1 << (int) RID_SIGNED)
4449 | (1 << (int) RID_UNSIGNED))))
4450 type = complex_double_type_node;
4451 else if (type == integer_type_node)
4452 type = complex_integer_type_node;
4453 else if (type == float_type_node)
4454 type = complex_float_type_node;
4455 else if (type == double_type_node)
4456 type = complex_double_type_node;
4457 else if (type == long_double_type_node)
4458 type = complex_long_double_type_node;
4460 type = build_complex_type (type);
4463 /* Set CONSTP if this declaration is `const', whether by
4464 explicit specification or via a typedef.
4465 Likewise for VOLATILEP. */
4467 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4468 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4469 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4471 pedwarn ("duplicate `const'");
4473 pedwarn ("duplicate `volatile'");
4474 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4475 type = TYPE_MAIN_VARIANT (type);
4477 /* Warn if two storage classes are given. Default to `auto'. */
4482 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4483 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4484 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4485 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4486 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4487 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4489 /* Warn about storage classes that are invalid for certain
4490 kinds of declarations (parameters, typenames, etc.). */
4493 error ("multiple storage classes in declaration of `%s'", name);
4494 else if (funcdef_flag
4496 & ((1 << (int) RID_REGISTER)
4497 | (1 << (int) RID_AUTO)
4498 | (1 << (int) RID_TYPEDEF))))
4500 if (specbits & 1 << (int) RID_AUTO
4501 && (pedantic || current_binding_level == global_binding_level))
4502 pedwarn ("function definition declared `auto'");
4503 if (specbits & 1 << (int) RID_REGISTER)
4504 error ("function definition declared `register'");
4505 if (specbits & 1 << (int) RID_TYPEDEF)
4506 error ("function definition declared `typedef'");
4507 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4508 | (1 << (int) RID_AUTO));
4510 else if (decl_context != NORMAL && nclasses > 0)
4512 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4516 error ((decl_context == FIELD
4517 ? "storage class specified for structure field `%s'"
4518 : (decl_context == PARM
4519 ? "storage class specified for parameter `%s'"
4520 : "storage class specified for typename")),
4522 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4523 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4524 | (1 << (int) RID_EXTERN));
4527 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4529 /* `extern' with initialization is invalid if not at top level. */
4530 if (current_binding_level == global_binding_level)
4531 warning ("`%s' initialized and declared `extern'", name);
4533 error ("`%s' has both `extern' and initializer", name);
4535 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4536 && current_binding_level != global_binding_level)
4537 error ("nested function `%s' declared `extern'", name);
4538 else if (current_binding_level == global_binding_level
4539 && specbits & (1 << (int) RID_AUTO))
4540 error ("top-level declaration of `%s' specifies `auto'", name);
4541 else if ((specbits & 1 << (int) RID_ITERATOR)
4542 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4544 error ("iterator `%s' has derived type", name);
4545 type = error_mark_node;
4547 else if ((specbits & 1 << (int) RID_ITERATOR)
4548 && TREE_CODE (type) != INTEGER_TYPE)
4550 error ("iterator `%s' has noninteger type", name);
4551 type = error_mark_node;
4555 /* Now figure out the structure of the declarator proper.
4556 Descend through it, creating more complex types, until we reach
4557 the declared identifier (or NULL_TREE, in an absolute declarator). */
4559 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4561 if (type == error_mark_node)
4563 declarator = TREE_OPERAND (declarator, 0);
4567 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4568 an INDIRECT_REF (for *...),
4569 a CALL_EXPR (for ...(...)),
4570 an identifier (for the name being declared)
4571 or a null pointer (for the place in an absolute declarator
4572 where the name was omitted).
4573 For the last two cases, we have just exited the loop.
4575 At this point, TYPE is the type of elements of an array,
4576 or for a function to return, or for a pointer to point to.
4577 After this sequence of ifs, TYPE is the type of the
4578 array or function or pointer, and DECLARATOR has had its
4579 outermost layer removed. */
4581 if (TREE_CODE (declarator) == ARRAY_REF)
4583 register tree itype = NULL_TREE;
4584 register tree size = TREE_OPERAND (declarator, 1);
4585 /* An uninitialized decl with `extern' is a reference. */
4586 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4587 /* The index is a signed object `sizetype' bits wide. */
4588 tree index_type = signed_type (sizetype);
4590 declarator = TREE_OPERAND (declarator, 0);
4592 /* Check for some types that there cannot be arrays of. */
4594 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4596 error ("declaration of `%s' as array of voids", name);
4597 type = error_mark_node;
4600 if (TREE_CODE (type) == FUNCTION_TYPE)
4602 error ("declaration of `%s' as array of functions", name);
4603 type = error_mark_node;
4606 if (size == error_mark_node)
4607 type = error_mark_node;
4609 if (type == error_mark_node)
4612 /* If this is a block level extern, it must live past the end
4613 of the function so that we can check it against other extern
4614 declarations (IDENTIFIER_LIMBO_VALUE). */
4615 if (extern_ref && allocation_temporary_p ())
4616 end_temporary_allocation ();
4618 /* If size was specified, set ITYPE to a range-type for that size.
4619 Otherwise, ITYPE remains null. finish_decl may figure it out
4620 from an initial value. */
4624 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4625 STRIP_TYPE_NOPS (size);
4627 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4628 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4630 error ("size of array `%s' has non-integer type", name);
4631 size = integer_one_node;
4634 if (pedantic && integer_zerop (size))
4635 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4637 if (TREE_CODE (size) == INTEGER_CST)
4639 constant_expression_warning (size);
4640 if (tree_int_cst_sgn (size) < 0)
4642 error ("size of array `%s' is negative", name);
4643 size = integer_one_node;
4648 /* Make sure the array size remains visibly nonconstant
4649 even if it is (eg) a const variable with known value. */
4654 if (TREE_CONSTANT (size))
4655 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4657 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4661 /* Convert size to index_type, so that if it is a variable
4662 the computations will be done in the proper mode. */
4663 itype = fold (build (MINUS_EXPR, index_type,
4664 convert (index_type, size),
4665 convert (index_type, size_one_node)));
4668 itype = variable_size (itype);
4669 itype = build_index_type (itype);
4672 #if 0 /* This had bad results for pointers to arrays, as in
4673 union incomplete (*foo)[4]; */
4674 /* Complain about arrays of incomplete types, except in typedefs. */
4676 if (TYPE_SIZE (type) == 0
4677 /* Avoid multiple warnings for nested array types. */
4678 && TREE_CODE (type) != ARRAY_TYPE
4679 && !(specbits & (1 << (int) RID_TYPEDEF))
4680 && !C_TYPE_BEING_DEFINED (type))
4681 warning ("array type has incomplete element type");
4684 #if 0 /* We shouldn't have a function type here at all!
4685 Functions aren't allowed as array elements. */
4686 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4687 && (constp || volatilep))
4688 pedwarn ("ANSI C forbids const or volatile function types");
4691 /* Build the array type itself, then merge any constancy or
4692 volatility into the target type. We must do it in this order
4693 to ensure that the TYPE_MAIN_VARIANT field of the array type
4694 is set correctly. */
4696 type = build_array_type (type, itype);
4697 if (constp || volatilep)
4698 type = c_build_type_variant (type, constp, volatilep);
4700 #if 0 /* don't clear these; leave them set so that the array type
4701 or the variable is itself const or volatile. */
4707 C_TYPE_VARIABLE_SIZE (type) = 1;
4709 else if (TREE_CODE (declarator) == CALL_EXPR)
4711 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4712 || current_binding_level == global_binding_level);
4715 /* Declaring a function type.
4716 Make sure we have a valid type for the function to return. */
4717 if (type == error_mark_node)
4722 /* Warn about some types functions can't return. */
4724 if (TREE_CODE (type) == FUNCTION_TYPE)
4726 error ("`%s' declared as function returning a function", name);
4727 type = integer_type_node;
4729 if (TREE_CODE (type) == ARRAY_TYPE)
4731 error ("`%s' declared as function returning an array", name);
4732 type = integer_type_node;
4735 #ifndef TRADITIONAL_RETURN_FLOAT
4736 /* Traditionally, declaring return type float means double. */
4738 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4739 type = double_type_node;
4740 #endif /* TRADITIONAL_RETURN_FLOAT */
4742 /* If this is a block level extern, it must live past the end
4743 of the function so that we can check it against other extern
4744 declarations (IDENTIFIER_LIMBO_VALUE). */
4745 if (extern_ref && allocation_temporary_p ())
4746 end_temporary_allocation ();
4748 /* Construct the function type and go to the next
4749 inner layer of declarator. */
4751 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4753 /* Say it's a definition
4754 only for the CALL_EXPR
4755 closest to the identifier. */
4756 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4757 #if 0 /* This seems to be false. We turn off temporary allocation
4758 above in this function if -traditional.
4759 And this code caused inconsistent results with prototypes:
4760 callers would ignore them, and pass arguments wrong. */
4762 /* Omit the arg types if -traditional, since the arg types
4763 and the list links might not be permanent. */
4764 type = build_function_type (type,
4766 ? NULL_TREE : arg_types);
4768 /* ANSI seems to say that `const int foo ();'
4769 does not make the function foo const. */
4770 if (constp || volatilep)
4771 type = c_build_type_variant (type, constp, volatilep);
4775 type = build_function_type (type, arg_types);
4776 declarator = TREE_OPERAND (declarator, 0);
4778 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4779 the formal parameter list of this FUNCTION_TYPE to point to
4780 the FUNCTION_TYPE node itself. */
4785 for (link = current_function_parm_tags;
4787 link = TREE_CHAIN (link))
4788 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4791 else if (TREE_CODE (declarator) == INDIRECT_REF)
4793 /* Merge any constancy or volatility into the target type
4796 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4797 && (constp || volatilep))
4798 pedwarn ("ANSI C forbids const or volatile function types");
4799 if (constp || volatilep)
4800 type = c_build_type_variant (type, constp, volatilep);
4805 type = build_pointer_type (type);
4807 /* Process a list of type modifier keywords
4808 (such as const or volatile) that were given inside the `*'. */
4810 if (TREE_TYPE (declarator))
4812 register tree typemodlist;
4814 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4815 typemodlist = TREE_CHAIN (typemodlist))
4817 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4819 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4824 error ("invalid type modifier within pointer declarator");
4828 pedwarn ("duplicate `const'");
4830 pedwarn ("duplicate `volatile'");
4833 declarator = TREE_OPERAND (declarator, 0);
4840 /* Now TYPE has the actual type. */
4842 /* If this is declaring a typedef name, return a TYPE_DECL. */
4844 if (specbits & (1 << (int) RID_TYPEDEF))
4847 /* Note that the grammar rejects storage classes
4848 in typenames, fields or parameters */
4849 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4850 && (constp || volatilep))
4851 pedwarn ("ANSI C forbids const or volatile function types");
4852 if (constp || volatilep)
4853 type = c_build_type_variant (type, constp, volatilep);
4854 decl = build_decl (TYPE_DECL, declarator, type);
4855 if ((specbits & (1 << (int) RID_SIGNED))
4856 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4857 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4862 /* Detect the case of an array type of unspecified size
4863 which came, as such, direct from a typedef name.
4864 We must copy the type, so that each identifier gets
4865 a distinct type, so that each identifier's size can be
4866 controlled separately by its own initializer. */
4868 if (type != 0 && typedef_type != 0
4869 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4870 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4872 type = build_array_type (TREE_TYPE (type), 0);
4874 C_TYPE_VARIABLE_SIZE (type) = 1;
4877 /* If this is a type name (such as, in a cast or sizeof),
4878 compute the type and return it now. */
4880 if (decl_context == TYPENAME)
4882 /* Note that the grammar rejects storage classes
4883 in typenames, fields or parameters */
4884 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4885 && (constp || volatilep))
4886 pedwarn ("ANSI C forbids const or volatile function types");
4887 if (constp || volatilep)
4888 type = c_build_type_variant (type, constp, volatilep);
4893 /* Aside from typedefs and type names (handle above),
4894 `void' at top level (not within pointer)
4895 is allowed only in public variables.
4896 We don't complain about parms either, but that is because
4897 a better error message can be made later. */
4899 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4900 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4901 && ((specbits & (1 << (int) RID_EXTERN))
4902 || (current_binding_level == global_binding_level
4904 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4906 error ("variable or field `%s' declared void", name);
4907 type = integer_type_node;
4910 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4911 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4916 if (decl_context == PARM)
4918 tree type_as_written = type;
4921 /* A parameter declared as an array of T is really a pointer to T.
4922 One declared as a function is really a pointer to a function. */
4924 if (TREE_CODE (type) == ARRAY_TYPE)
4926 /* Transfer const-ness of array into that of type pointed to. */
4927 type = TREE_TYPE (type);
4928 if (constp || volatilep)
4929 type = c_build_type_variant (type, constp, volatilep);
4930 type = build_pointer_type (type);
4931 volatilep = constp = 0;
4934 else if (TREE_CODE (type) == FUNCTION_TYPE)
4936 if (pedantic && (constp || volatilep))
4937 pedwarn ("ANSI C forbids const or volatile function types");
4938 if (constp || volatilep)
4939 type = c_build_type_variant (type, constp, volatilep);
4940 type = build_pointer_type (type);
4941 volatilep = constp = 0;
4944 decl = build_decl (PARM_DECL, declarator, type);
4946 C_DECL_VARIABLE_SIZE (decl) = 1;
4948 /* Compute the type actually passed in the parmlist,
4949 for the case where there is no prototype.
4950 (For example, shorts and chars are passed as ints.)
4951 When there is a prototype, this is overridden later. */
4953 DECL_ARG_TYPE (decl) = type;
4954 main_type = (type == error_mark_node
4956 : TYPE_MAIN_VARIANT (type));
4957 if (main_type == float_type_node)
4958 DECL_ARG_TYPE (decl) = double_type_node;
4959 /* Don't use TYPE_PRECISION to decide whether to promote,
4960 because we should convert short if it's the same size as int,
4961 but we should not convert long if it's the same size as int. */
4962 else if (TREE_CODE (main_type) != ERROR_MARK
4963 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4965 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4966 && TREE_UNSIGNED (type))
4967 DECL_ARG_TYPE (decl) = unsigned_type_node;
4969 DECL_ARG_TYPE (decl) = integer_type_node;
4972 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4974 else if (decl_context == FIELD)
4976 /* Structure field. It may not be a function. */
4978 if (TREE_CODE (type) == FUNCTION_TYPE)
4980 error ("field `%s' declared as a function", name);
4981 type = build_pointer_type (type);
4983 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4985 error ("field `%s' has incomplete type", name);
4986 type = error_mark_node;
4988 /* Move type qualifiers down to element of an array. */
4989 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4991 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4993 TYPE_DOMAIN (type));
4994 #if 0 /* Leave the field const or volatile as well. */
4995 constp = volatilep = 0;
4998 decl = build_decl (FIELD_DECL, declarator, type);
5000 C_DECL_VARIABLE_SIZE (decl) = 1;
5002 else if (TREE_CODE (type) == FUNCTION_TYPE)
5004 /* Every function declaration is "external"
5005 except for those which are inside a function body
5006 in which `auto' is used.
5007 That is a case not specified by ANSI C,
5008 and we use it for forward declarations for nested functions. */
5009 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5010 || current_binding_level == global_binding_level);
5012 if (specbits & (1 << (int) RID_AUTO)
5013 && (pedantic || current_binding_level == global_binding_level))
5014 pedwarn ("invalid storage class for function `%s'", name);
5015 if (specbits & (1 << (int) RID_REGISTER))
5016 error ("invalid storage class for function `%s'", name);
5017 /* Function declaration not at top level.
5018 Storage classes other than `extern' are not allowed
5019 and `extern' makes no difference. */
5020 if (current_binding_level != global_binding_level
5021 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5023 pedwarn ("invalid storage class for function `%s'", name);
5025 /* If this is a block level extern, it must live past the end
5026 of the function so that we can check it against other
5027 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5028 if (extern_ref && allocation_temporary_p ())
5029 end_temporary_allocation ();
5031 decl = build_decl (FUNCTION_DECL, declarator, type);
5032 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5034 if (pedantic && (constp || volatilep)
5035 && ! DECL_IN_SYSTEM_HEADER (decl))
5036 pedwarn ("ANSI C forbids const or volatile functions");
5039 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5040 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5041 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5042 && ! DECL_IN_SYSTEM_HEADER (decl))
5043 pedwarn ("ANSI C forbids const or volatile void function return type");
5046 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5047 warning ("`noreturn' function returns non-void value");
5050 DECL_EXTERNAL (decl) = 1;
5051 /* Record absence of global scope for `static' or `auto'. */
5053 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5055 /* Record presence of `inline', if it is reasonable. */
5058 tree last = tree_last (TYPE_ARG_TYPES (type));
5060 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5061 warning ("cannot inline function `main'");
5062 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5064 warning ("inline declaration ignored for function with `...'");
5066 /* Assume that otherwise the function can be inlined. */
5067 DECL_INLINE (decl) = 1;
5069 if (specbits & (1 << (int) RID_EXTERN))
5070 current_extern_inline = 1;
5075 /* It's a variable. */
5076 /* An uninitialized decl with `extern' is a reference. */
5077 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5079 /* Move type qualifiers down to element of an array. */
5080 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5082 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5084 TYPE_DOMAIN (type));
5085 #if 0 /* Leave the variable const or volatile as well. */
5086 constp = volatilep = 0;
5090 /* If this is a block level extern, it must live past the end
5091 of the function so that we can check it against other
5092 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5093 if (extern_ref && allocation_temporary_p ())
5094 end_temporary_allocation ();
5096 decl = build_decl (VAR_DECL, declarator, type);
5098 C_DECL_VARIABLE_SIZE (decl) = 1;
5101 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5103 DECL_EXTERNAL (decl) = extern_ref;
5104 /* At top level, the presence of a `static' or `register' storage
5105 class specifier, or the absence of all storage class specifiers
5106 makes this declaration a definition (perhaps tentative). Also,
5107 the absence of both `static' and `register' makes it public. */
5108 if (current_binding_level == global_binding_level)
5112 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5113 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5115 /* Not at top level, only `static' makes a static definition. */
5118 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5119 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5122 if (specbits & 1 << (int) RID_ITERATOR)
5123 ITERATOR_P (decl) = 1;
5126 /* Record `register' declaration for warnings on &
5127 and in case doing stupid register allocation. */
5129 if (specbits & (1 << (int) RID_REGISTER))
5130 DECL_REGISTER (decl) = 1;
5132 /* Record constancy and volatility. */
5135 TREE_READONLY (decl) = 1;
5138 TREE_SIDE_EFFECTS (decl) = 1;
5139 TREE_THIS_VOLATILE (decl) = 1;
5141 /* If a type has volatile components, it should be stored in memory.
5142 Otherwise, the fact that those components are volatile
5143 will be ignored, and would even crash the compiler. */
5144 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5145 mark_addressable (decl);
5153 /* Decode the parameter-list info for a function type or function definition.
5154 The argument is the value returned by `get_parm_info' (or made in parse.y
5155 if there is an identifier list instead of a parameter decl list).
5156 These two functions are separate because when a function returns
5157 or receives functions then each is called multiple times but the order
5158 of calls is different. The last call to `grokparms' is always the one
5159 that contains the formal parameter names of a function definition.
5161 Store in `last_function_parms' a chain of the decls of parms.
5162 Also store in `last_function_parm_tags' a chain of the struct, union,
5163 and enum tags declared among the parms.
5165 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5167 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5168 a mere declaration. A nonempty identifier-list gets an error message
5169 when FUNCDEF_FLAG is zero. */
5172 grokparms (parms_info, funcdef_flag)
5176 tree first_parm = TREE_CHAIN (parms_info);
5178 last_function_parms = TREE_PURPOSE (parms_info);
5179 last_function_parm_tags = TREE_VALUE (parms_info);
5181 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5182 && !in_system_header)
5183 warning ("function declaration isn't a prototype");
5186 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5189 pedwarn ("parameter names (without types) in function declaration");
5191 last_function_parms = first_parm;
5198 /* We no longer test FUNCDEF_FLAG.
5199 If the arg types are incomplete in a declaration,
5200 they must include undefined tags.
5201 These tags can never be defined in the scope of the declaration,
5202 so the types can never be completed,
5203 and no call can be compiled successfully. */
5205 /* In a fcn definition, arg types must be complete. */
5208 for (parm = last_function_parms, typelt = first_parm;
5210 parm = TREE_CHAIN (parm))
5211 /* Skip over any enumeration constants declared here. */
5212 if (TREE_CODE (parm) == PARM_DECL)
5214 /* Barf if the parameter itself has an incomplete type. */
5215 tree type = TREE_VALUE (typelt);
5216 if (TYPE_SIZE (type) == 0)
5218 if (funcdef_flag && DECL_NAME (parm) != 0)
5219 error ("parameter `%s' has incomplete type",
5220 IDENTIFIER_POINTER (DECL_NAME (parm)));
5222 warning ("parameter has incomplete type");
5225 TREE_VALUE (typelt) = error_mark_node;
5226 TREE_TYPE (parm) = error_mark_node;
5229 #if 0 /* This has been replaced by parm_tags_warning
5230 which uses a more accurate criterion for what to warn about. */
5233 /* Now warn if is a pointer to an incomplete type. */
5234 while (TREE_CODE (type) == POINTER_TYPE
5235 || TREE_CODE (type) == REFERENCE_TYPE)
5236 type = TREE_TYPE (type);
5237 type = TYPE_MAIN_VARIANT (type);
5238 if (TYPE_SIZE (type) == 0)
5240 if (DECL_NAME (parm) != 0)
5241 warning ("parameter `%s' points to incomplete type",
5242 IDENTIFIER_POINTER (DECL_NAME (parm)));
5244 warning ("parameter points to incomplete type");
5248 typelt = TREE_CHAIN (typelt);
5251 /* Allocate the list of types the way we allocate a type. */
5252 if (first_parm && ! TREE_PERMANENT (first_parm))
5254 /* Construct a copy of the list of types
5255 on the saveable obstack. */
5257 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5258 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5260 return nreverse (result);
5263 /* The list we have is permanent already. */
5269 /* Return a tree_list node with info on a parameter list just parsed.
5270 The TREE_PURPOSE is a chain of decls of those parms.
5271 The TREE_VALUE is a list of structure, union and enum tags defined.
5272 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5273 This tree_list node is later fed to `grokparms'.
5275 VOID_AT_END nonzero means append `void' to the end of the type-list.
5276 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5279 get_parm_info (void_at_end)
5282 register tree decl, t;
5283 register tree types = 0;
5285 tree tags = gettags ();
5286 tree parms = getdecls ();
5288 tree order = current_binding_level->parm_order;
5290 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5291 if (void_at_end && parms != 0
5292 && TREE_CHAIN (parms) == 0
5293 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5294 && DECL_NAME (parms) == 0)
5297 storedecls (NULL_TREE);
5298 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5299 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5302 /* Extract enumerator values and other non-parms declared with the parms.
5303 Likewise any forward parm decls that didn't have real parm decls. */
5304 for (decl = parms; decl; )
5306 tree next = TREE_CHAIN (decl);
5308 if (TREE_CODE (decl) != PARM_DECL)
5310 TREE_CHAIN (decl) = new_parms;
5313 else if (TREE_ASM_WRITTEN (decl))
5315 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5316 TREE_CHAIN (decl) = new_parms;
5322 /* Put the parm decls back in the order they were in in the parm list. */
5323 for (t = order; t; t = TREE_CHAIN (t))
5326 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5328 TREE_CHAIN (TREE_VALUE (t)) = 0;
5331 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5334 /* Store the parmlist in the binding level since the old one
5335 is no longer a valid list. (We have changed the chain pointers.) */
5336 storedecls (new_parms);
5338 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5339 /* There may also be declarations for enumerators if an enumeration
5340 type is declared among the parms. Ignore them here. */
5341 if (TREE_CODE (decl) == PARM_DECL)
5343 /* Since there is a prototype,
5344 args are passed in their declared types. */
5345 tree type = TREE_TYPE (decl);
5346 DECL_ARG_TYPE (decl) = type;
5347 #ifdef PROMOTE_PROTOTYPES
5348 if ((TREE_CODE (type) == INTEGER_TYPE
5349 || TREE_CODE (type) == ENUMERAL_TYPE)
5350 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5351 DECL_ARG_TYPE (decl) = integer_type_node;
5354 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5355 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5356 && DECL_NAME (decl) == 0)
5358 error ("`void' in parameter list must be the entire list");
5364 return saveable_tree_cons (new_parms, tags,
5365 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5367 return saveable_tree_cons (new_parms, tags, nreverse (types));
5370 /* At end of parameter list, warn about any struct, union or enum tags
5371 defined within. Do so because these types cannot ever become complete. */
5374 parmlist_tags_warning ()
5379 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5381 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5382 /* An anonymous union parm type is meaningful as a GNU extension.
5383 So don't warn for that. */
5384 if (code == UNION_TYPE && !pedantic)
5386 if (TREE_PURPOSE (elt) != 0)
5387 warning ("`%s %s' declared inside parameter list",
5388 (code == RECORD_TYPE ? "struct"
5389 : code == UNION_TYPE ? "union"
5391 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5393 warning ("anonymous %s declared inside parameter list",
5394 (code == RECORD_TYPE ? "struct"
5395 : code == UNION_TYPE ? "union"
5400 warning ("its scope is only this definition or declaration,");
5401 warning ("which is probably not what you want.");
5407 /* Get the struct, enum or union (CODE says which) with tag NAME.
5408 Define the tag as a forward-reference if it is not defined. */
5411 xref_tag (code, name)
5412 enum tree_code code;
5415 int temporary = allocation_temporary_p ();
5417 /* If a cross reference is requested, look up the type
5418 already defined for this tag and return it. */
5420 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5421 /* Even if this is the wrong type of tag, return what we found.
5422 There will be an error message anyway, from pending_xref_error.
5423 If we create an empty xref just for an invalid use of the type,
5424 the main result is to create lots of superfluous error messages. */
5428 push_obstacks_nochange ();
5430 if (current_binding_level == global_binding_level && temporary)
5431 end_temporary_allocation ();
5433 /* If no such tag is yet defined, create a forward-reference node
5434 and record it as the "definition".
5435 When a real declaration of this type is found,
5436 the forward-reference will be altered into a real type. */
5438 ref = make_node (code);
5439 if (code == ENUMERAL_TYPE)
5441 /* (In ANSI, Enums can be referred to only if already defined.) */
5443 pedwarn ("ANSI C forbids forward references to `enum' types");
5444 /* Give the type a default layout like unsigned int
5445 to avoid crashing if it does not get defined. */
5446 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5447 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5448 TREE_UNSIGNED (ref) = 1;
5449 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5450 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5451 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5454 pushtag (name, ref);
5461 /* Make sure that the tag NAME is defined *in the current binding level*
5462 at least as a forward reference.
5463 CODE says which kind of tag NAME ought to be.
5465 We also do a push_obstacks_nochange
5466 whose matching pop is in finish_struct. */
5469 start_struct (code, name)
5470 enum tree_code code;
5473 /* If there is already a tag defined at this binding level
5474 (as a forward reference), just return it. */
5476 register tree ref = 0;
5478 push_obstacks_nochange ();
5479 if (current_binding_level == global_binding_level)
5480 end_temporary_allocation ();
5483 ref = lookup_tag (code, name, current_binding_level, 1);
5484 if (ref && TREE_CODE (ref) == code)
5486 C_TYPE_BEING_DEFINED (ref) = 1;
5487 if (TYPE_FIELDS (ref))
5488 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5489 : "redefinition of `struct %s'"),
5490 IDENTIFIER_POINTER (name));
5495 /* Otherwise create a forward-reference just so the tag is in scope. */
5497 ref = make_node (code);
5498 pushtag (name, ref);
5499 C_TYPE_BEING_DEFINED (ref) = 1;
5500 TYPE_PACKED (ref) = flag_pack_struct;
5504 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5505 of a structure component, returning a FIELD_DECL node.
5506 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5508 This is done during the parsing of the struct declaration.
5509 The FIELD_DECL nodes are chained together and the lot of them
5510 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5513 grokfield (filename, line, declarator, declspecs, width)
5516 tree declarator, declspecs, width;
5520 /* The corresponding pop_obstacks is in finish_decl. */
5521 push_obstacks_nochange ();
5523 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5525 finish_decl (value, NULL_TREE, NULL_TREE);
5526 DECL_INITIAL (value) = width;
5528 maybe_objc_check_decl (value);
5532 /* Function to help qsort sort FIELD_DECLs by name order. */
5535 field_decl_cmp (xp, yp)
5536 const GENERIC_PTR xp;
5537 const GENERIC_PTR yp;
5539 tree *x = (tree *)xp, *y = (tree *)yp;
5541 if (DECL_NAME (*x) == DECL_NAME (*y))
5543 if (DECL_NAME (*x) == NULL)
5545 if (DECL_NAME (*y) == NULL)
5547 if (DECL_NAME (*x) < DECL_NAME (*y))
5552 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5553 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5554 ATTRIBUTES are attributes to be applied to the structure.
5556 We also do a pop_obstacks to match the push in start_struct. */
5559 finish_struct (t, fieldlist, attributes)
5566 int toplevel = global_binding_level == current_binding_level;
5568 /* If this type was previously laid out as a forward reference,
5569 make sure we lay it out again. */
5573 decl_attributes (t, attributes, NULL_TREE);
5575 /* Nameless union parm types are useful as GCC extension. */
5576 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5577 /* Otherwise, warn about any struct or union def. in parmlist. */
5578 if (in_parm_level_p ())
5581 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5582 : "structure defined inside parms"));
5583 else if (! flag_traditional)
5584 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5585 : "structure defined inside parms"));
5588 old_momentary = suspend_momentary ();
5592 for (x = fieldlist; x; x = TREE_CHAIN (x))
5593 if (DECL_NAME (x) != 0)
5597 pedwarn ("%s has no %smembers",
5598 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5599 (fieldlist ? "named " : ""));
5602 /* Install struct as DECL_CONTEXT of each field decl.
5603 Also process specified field sizes.
5604 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5605 The specified size is found in the DECL_INITIAL.
5606 Store 0 there, except for ": 0" fields (so we can find them
5607 and delete them, below). */
5609 for (x = fieldlist; x; x = TREE_CHAIN (x))
5611 DECL_CONTEXT (x) = t;
5612 DECL_PACKED (x) |= TYPE_PACKED (t);
5613 DECL_FIELD_SIZE (x) = 0;
5615 /* If any field is const, the structure type is pseudo-const. */
5616 if (TREE_READONLY (x))
5617 C_TYPE_FIELDS_READONLY (t) = 1;
5620 /* A field that is pseudo-const makes the structure likewise. */
5621 tree t1 = TREE_TYPE (x);
5622 while (TREE_CODE (t1) == ARRAY_TYPE)
5623 t1 = TREE_TYPE (t1);
5624 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5625 && C_TYPE_FIELDS_READONLY (t1))
5626 C_TYPE_FIELDS_READONLY (t) = 1;
5629 /* Any field that is volatile means variables of this type must be
5630 treated in some ways as volatile. */
5631 if (TREE_THIS_VOLATILE (x))
5632 C_TYPE_FIELDS_VOLATILE (t) = 1;
5634 /* Any field of nominal variable size implies structure is too. */
5635 if (C_DECL_VARIABLE_SIZE (x))
5636 C_TYPE_VARIABLE_SIZE (t) = 1;
5638 /* Detect invalid nested redefinition. */
5639 if (TREE_TYPE (x) == t)
5640 error ("nested redefinition of `%s'",
5641 IDENTIFIER_POINTER (TYPE_NAME (t)));
5643 /* Detect invalid bit-field size. */
5644 if (DECL_INITIAL (x))
5645 STRIP_NOPS (DECL_INITIAL (x));
5646 if (DECL_INITIAL (x))
5648 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5649 constant_expression_warning (DECL_INITIAL (x));
5652 error_with_decl (x, "bit-field `%s' width not an integer constant");
5653 DECL_INITIAL (x) = NULL;
5657 /* Detect invalid bit-field type. */
5658 if (DECL_INITIAL (x)
5659 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5660 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5662 error_with_decl (x, "bit-field `%s' has invalid type");
5663 DECL_INITIAL (x) = NULL;
5665 if (DECL_INITIAL (x) && pedantic
5666 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5667 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5668 /* Accept an enum that's equivalent to int or unsigned int. */
5669 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5670 && (TYPE_PRECISION (TREE_TYPE (x))
5671 == TYPE_PRECISION (integer_type_node))))
5672 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5674 /* Detect and ignore out of range field width. */
5675 if (DECL_INITIAL (x))
5677 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5679 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5681 DECL_INITIAL (x) = NULL;
5682 error_with_decl (x, "negative width in bit-field `%s'");
5684 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5685 || width > TYPE_PRECISION (TREE_TYPE (x)))
5687 DECL_INITIAL (x) = NULL;
5688 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5690 else if (width == 0 && DECL_NAME (x) != 0)
5692 error_with_decl (x, "zero width for bit-field `%s'");
5693 DECL_INITIAL (x) = NULL;
5697 /* Process valid field width. */
5698 if (DECL_INITIAL (x))
5700 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5702 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5703 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5704 TREE_UNSIGNED (TREE_TYPE (x)))
5705 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5706 TREE_UNSIGNED (TREE_TYPE (x)))))
5707 warning_with_decl (x, "`%s' is narrower than values of its type");
5709 DECL_FIELD_SIZE (x) = width;
5710 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5711 DECL_INITIAL (x) = NULL;
5715 /* field size 0 => force desired amount of alignment. */
5716 #ifdef EMPTY_FIELD_BOUNDARY
5717 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5719 #ifdef PCC_BITFIELD_TYPE_MATTERS
5720 if (PCC_BITFIELD_TYPE_MATTERS)
5721 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5722 TYPE_ALIGN (TREE_TYPE (x)));
5726 else if (TREE_TYPE (x) != error_mark_node)
5728 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5729 : TYPE_ALIGN (TREE_TYPE (x)));
5730 /* Non-bit-fields are aligned for their type, except packed
5731 fields which require only BITS_PER_UNIT alignment. */
5732 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5736 /* Now DECL_INITIAL is null on all members. */
5738 /* Delete all duplicate fields from the fieldlist */
5739 for (x = fieldlist; x && TREE_CHAIN (x);)
5740 /* Anonymous fields aren't duplicates. */
5741 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5745 register tree y = fieldlist;
5749 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5755 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5757 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5758 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5760 else x = TREE_CHAIN (x);
5763 /* Now we have the nearly final fieldlist. Record it,
5764 then lay out the structure or union (including the fields). */
5766 TYPE_FIELDS (t) = fieldlist;
5770 /* Delete all zero-width bit-fields from the front of the fieldlist */
5772 && DECL_INITIAL (fieldlist))
5773 fieldlist = TREE_CHAIN (fieldlist);
5774 /* Delete all such members from the rest of the fieldlist */
5775 for (x = fieldlist; x;)
5777 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5778 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5779 else x = TREE_CHAIN (x);
5782 /* Now we have the truly final field list.
5783 Store it in this type and in the variants. */
5785 TYPE_FIELDS (t) = fieldlist;
5787 /* If there are lots of fields, sort so we can look through them fast.
5788 We arbitrarily consider 16 or more elts to be "a lot". */
5792 for (x = fieldlist; x; x = TREE_CHAIN (x))
5803 len += list_length (x);
5804 /* Use the same allocation policy here that make_node uses, to
5805 ensure that this lives as long as the rest of the struct decl.
5806 All decls in an inline function need to be saved. */
5807 if (allocation_temporary_p ())
5808 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5810 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5812 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5813 TYPE_LANG_SPECIFIC (t)->len = len;
5815 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5817 for (x = fieldlist; x; x = TREE_CHAIN (x))
5818 field_array[len++] = x;
5820 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5824 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5826 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5827 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5828 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5831 /* If this was supposed to be a transparent union, but we can't
5832 make it one, warn and turn off the flag. */
5833 if (TREE_CODE (t) == UNION_TYPE
5834 && TYPE_TRANSPARENT_UNION (t)
5835 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5837 TYPE_TRANSPARENT_UNION (t) = 0;
5838 warning ("union cannot be made transparent");
5841 /* If this structure or union completes the type of any previous
5842 variable declaration, lay it out and output its rtl. */
5844 if (current_binding_level->n_incomplete != 0)
5847 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5849 if (TREE_TYPE (decl) == t
5850 && TREE_CODE (decl) != TYPE_DECL)
5852 layout_decl (decl, 0);
5853 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5854 maybe_objc_check_decl (decl);
5855 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5858 --current_binding_level->n_incomplete;
5860 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5861 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5863 tree element = TREE_TYPE (decl);
5864 while (TREE_CODE (element) == ARRAY_TYPE)
5865 element = TREE_TYPE (element);
5867 layout_array_type (TREE_TYPE (decl));
5872 resume_momentary (old_momentary);
5874 /* Finish debugging output for this type. */
5875 rest_of_type_compilation (t, toplevel);
5877 /* The matching push is in start_struct. */
5883 /* Lay out the type T, and its element type, and so on. */
5886 layout_array_type (t)
5889 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5890 layout_array_type (TREE_TYPE (t));
5894 /* Begin compiling the definition of an enumeration type.
5895 NAME is its name (or null if anonymous).
5896 Returns the type object, as yet incomplete.
5897 Also records info about it so that build_enumerator
5898 may be used to declare the individual values as they are read. */
5904 register tree enumtype = 0;
5906 /* If this is the real definition for a previous forward reference,
5907 fill in the contents in the same object that used to be the
5908 forward reference. */
5911 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5913 /* The corresponding pop_obstacks is in finish_enum. */
5914 push_obstacks_nochange ();
5915 /* If these symbols and types are global, make them permanent. */
5916 if (current_binding_level == global_binding_level)
5917 end_temporary_allocation ();
5919 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5921 enumtype = make_node (ENUMERAL_TYPE);
5922 pushtag (name, enumtype);
5925 C_TYPE_BEING_DEFINED (enumtype) = 1;
5927 if (TYPE_VALUES (enumtype) != 0)
5929 /* This enum is a named one that has been declared already. */
5930 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5932 /* Completely replace its old definition.
5933 The old enumerators remain defined, however. */
5934 TYPE_VALUES (enumtype) = 0;
5937 enum_next_value = integer_zero_node;
5940 if (flag_short_enums)
5941 TYPE_PACKED (enumtype) = 1;
5946 /* After processing and defining all the values of an enumeration type,
5947 install their decls in the enumeration type and finish it off.
5948 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5949 and ATTRIBUTES are the specified attributes.
5950 Returns ENUMTYPE. */
5953 finish_enum (enumtype, values, attributes)
5958 register tree pair, tem;
5959 tree minnode = 0, maxnode = 0;
5960 int lowprec, highprec, precision;
5961 int toplevel = global_binding_level == current_binding_level;
5963 if (in_parm_level_p ())
5964 warning ("enum defined inside parms");
5966 decl_attributes (enumtype, attributes, NULL_TREE);
5968 /* Calculate the maximum value of any enumerator in this type. */
5970 if (values == error_mark_node)
5971 minnode = maxnode = integer_zero_node;
5973 for (pair = values; pair; pair = TREE_CHAIN (pair))
5975 tree value = TREE_VALUE (pair);
5977 minnode = maxnode = TREE_VALUE (pair);
5980 if (tree_int_cst_lt (maxnode, value))
5982 if (tree_int_cst_lt (value, minnode))
5987 TYPE_MIN_VALUE (enumtype) = minnode;
5988 TYPE_MAX_VALUE (enumtype) = maxnode;
5990 /* An enum can have some negative values; then it is signed. */
5991 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5993 /* Determine the precision this type needs. */
5995 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5996 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5997 precision = MAX (lowprec, highprec);
5999 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6001 tree narrowest = type_for_size (precision, 1);
6004 warning ("enumeration values exceed range of largest integer");
6005 narrowest = long_long_integer_type_node;
6008 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6011 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6013 TYPE_SIZE (enumtype) = 0;
6014 layout_type (enumtype);
6016 if (values != error_mark_node)
6018 /* Change the type of the enumerators to be the enum type.
6019 Formerly this was done only for enums that fit in an int,
6020 but the comment said it was done only for enums wider than int.
6021 It seems necessary to do this for wide enums,
6022 and best not to change what's done for ordinary narrower ones. */
6023 for (pair = values; pair; pair = TREE_CHAIN (pair))
6025 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6026 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6027 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6028 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6031 /* Replace the decl nodes in VALUES with their names. */
6032 for (pair = values; pair; pair = TREE_CHAIN (pair))
6033 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6035 TYPE_VALUES (enumtype) = values;
6038 /* Fix up all variant types of this enum type. */
6039 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6041 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6042 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6043 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6044 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6045 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6046 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6047 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6048 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6051 /* Finish debugging output for this type. */
6052 rest_of_type_compilation (enumtype, toplevel);
6054 /* This matches a push in start_enum. */
6060 /* Build and install a CONST_DECL for one value of the
6061 current enumeration type (one that was begun with start_enum).
6062 Return a tree-list containing the CONST_DECL and its value.
6063 Assignment of sequential values by default is handled here. */
6066 build_enumerator (name, value)
6069 register tree decl, type;
6071 /* Validate and default VALUE. */
6073 /* Remove no-op casts from the value. */
6075 STRIP_TYPE_NOPS (value);
6079 if (TREE_CODE (value) == INTEGER_CST)
6081 value = default_conversion (value);
6082 constant_expression_warning (value);
6086 error ("enumerator value for `%s' not integer constant",
6087 IDENTIFIER_POINTER (name));
6092 /* Default based on previous value. */
6093 /* It should no longer be possible to have NON_LVALUE_EXPR
6097 value = enum_next_value;
6099 error ("overflow in enumeration values");
6102 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6104 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6105 value = integer_zero_node;
6108 /* Set basis for default for next value. */
6109 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6110 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6112 /* Now create a declaration for the enum value name. */
6114 type = TREE_TYPE (value);
6115 type = type_for_size (MAX (TYPE_PRECISION (type),
6116 TYPE_PRECISION (integer_type_node)),
6118 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6119 && TREE_UNSIGNED (type)));
6121 decl = build_decl (CONST_DECL, name, type);
6122 DECL_INITIAL (decl) = value;
6123 TREE_TYPE (value) = type;
6126 return saveable_tree_cons (decl, value, NULL_TREE);
6129 /* Create the FUNCTION_DECL for a function definition.
6130 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6131 the declaration; they describe the function's name and the type it returns,
6132 but twisted together in a fashion that parallels the syntax of C.
6134 This function creates a binding context for the function body
6135 as well as setting up the FUNCTION_DECL in current_function_decl.
6137 Returns 1 on success. If the DECLARATOR is not suitable for a function
6138 (it defines a datum instead), we return 0, which tells
6139 yyparse to report a parse error.
6141 NESTED is nonzero for a function nested within another function. */
6144 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6145 tree declarator, declspecs, prefix_attributes, attributes;
6148 tree decl1, old_decl;
6150 int old_immediate_size_expand = immediate_size_expand;
6152 current_function_returns_value = 0; /* Assume, until we see it does. */
6153 current_function_returns_null = 0;
6154 warn_about_return_type = 0;
6155 current_extern_inline = 0;
6156 c_function_varargs = 0;
6158 shadowed_labels = 0;
6160 /* Don't expand any sizes in the return type of the function. */
6161 immediate_size_expand = 0;
6163 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6165 /* If the declarator is not suitable for a function definition,
6166 cause a syntax error. */
6170 decl_attributes (decl1, prefix_attributes, attributes);
6172 announce_function (decl1);
6174 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6176 error ("return-type is an incomplete type");
6177 /* Make it return void instead. */
6179 = build_function_type (void_type_node,
6180 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6183 if (warn_about_return_type)
6184 warning ("return-type defaults to `int'");
6186 /* Save the parm names or decls from this function's declarator
6187 where store_parm_decls will find them. */
6188 current_function_parms = last_function_parms;
6189 current_function_parm_tags = last_function_parm_tags;
6191 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6192 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6193 DECL_INITIAL (decl1) = error_mark_node;
6195 /* If this definition isn't a prototype and we had a prototype declaration
6196 before, copy the arg type info from that prototype.
6197 But not if what we had before was a builtin function. */
6198 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6199 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6200 && !DECL_BUILT_IN (old_decl)
6201 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6202 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6203 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6205 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6206 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6207 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6210 /* If there is no explicit declaration, look for any out-of-scope implicit
6213 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6215 /* Optionally warn of old-fashioned def with no previous prototype. */
6216 if (warn_strict_prototypes
6217 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6218 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6219 warning ("function declaration isn't a prototype");
6220 /* Optionally warn of any global def with no previous prototype. */
6221 else if (warn_missing_prototypes
6222 && TREE_PUBLIC (decl1)
6223 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6224 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6225 warning_with_decl (decl1, "no previous prototype for `%s'");
6226 /* Optionally warn of any def with no previous prototype
6227 if the function has already been used. */
6228 else if (warn_missing_prototypes
6229 && old_decl != 0 && TREE_USED (old_decl)
6230 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6231 warning_with_decl (decl1,
6232 "`%s' was used with no prototype before its definition");
6233 /* Optionally warn of any global def with no previous declaration. */
6234 else if (warn_missing_declarations
6235 && TREE_PUBLIC (decl1)
6237 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6238 warning_with_decl (decl1, "no previous declaration for `%s'");
6239 /* Optionally warn of any def with no previous declaration
6240 if the function has already been used. */
6241 else if (warn_missing_declarations
6242 && old_decl != 0 && TREE_USED (old_decl)
6243 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6244 warning_with_decl (decl1,
6245 "`%s' was used with no declaration before its definition");
6247 /* This is a definition, not a reference.
6248 So normally clear DECL_EXTERNAL.
6249 However, `extern inline' acts like a declaration
6250 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6251 DECL_EXTERNAL (decl1) = current_extern_inline;
6253 /* This function exists in static storage.
6254 (This does not mean `static' in the C sense!) */
6255 TREE_STATIC (decl1) = 1;
6257 /* A nested function is not global. */
6258 if (current_function_decl != 0)
6259 TREE_PUBLIC (decl1) = 0;
6261 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6263 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6268 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6269 != integer_type_node)
6270 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6272 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6273 args = TREE_CHAIN (args))
6275 tree type = args ? TREE_VALUE (args) : 0;
6277 if (type == void_type_node)
6284 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6285 pedwarn_with_decl (decl1,
6286 "first argument of `%s' should be `int'");
6290 if (TREE_CODE (type) != POINTER_TYPE
6291 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6292 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6294 pedwarn_with_decl (decl1,
6295 "second argument of `%s' should be `char **'");
6299 if (TREE_CODE (type) != POINTER_TYPE
6300 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6301 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6303 pedwarn_with_decl (decl1,
6304 "third argument of `%s' should probably be `char **'");
6309 /* It is intentional that this message does not mention the third
6310 argument, which is warned for only pedantically, because it's
6311 blessed by mention in an appendix of the standard. */
6312 if (argct > 0 && (argct < 2 || argct > 3))
6313 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6315 if (argct == 3 && pedantic)
6316 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6318 if (! TREE_PUBLIC (decl1))
6319 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6322 /* Record the decl so that the function name is defined.
6323 If we already have a decl for this name, and it is a FUNCTION_DECL,
6324 use the old decl. */
6326 current_function_decl = pushdecl (decl1);
6329 declare_parm_level (1);
6330 current_binding_level->subblocks_tag_transparent = 1;
6332 make_function_rtl (current_function_decl);
6334 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6335 /* Promote the value to int before returning it. */
6336 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6338 /* It retains unsignedness if traditional
6339 or if not really getting wider. */
6340 if (TREE_UNSIGNED (restype)
6341 && (flag_traditional
6342 || (TYPE_PRECISION (restype)
6343 == TYPE_PRECISION (integer_type_node))))
6344 restype = unsigned_type_node;
6346 restype = integer_type_node;
6348 DECL_RESULT (current_function_decl)
6349 = build_decl (RESULT_DECL, NULL_TREE, restype);
6352 /* Allocate further tree nodes temporarily during compilation
6353 of this function only. */
6354 temporary_allocation ();
6356 /* If this fcn was already referenced via a block-scope `extern' decl
6357 (or an implicit decl), propagate certain information about the usage. */
6358 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6359 TREE_ADDRESSABLE (current_function_decl) = 1;
6361 immediate_size_expand = old_immediate_size_expand;
6366 /* Record that this function is going to be a varargs function.
6367 This is called before store_parm_decls, which is too early
6368 to call mark_varargs directly. */
6373 c_function_varargs = 1;
6376 /* Store the parameter declarations into the current function declaration.
6377 This is called after parsing the parameter declarations, before
6378 digesting the body of the function.
6380 For an old-style definition, modify the function's type
6381 to specify at least the number of arguments. */
6386 register tree fndecl = current_function_decl;
6389 /* This is either a chain of PARM_DECLs (if a prototype was used)
6390 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6391 tree specparms = current_function_parms;
6393 /* This is a list of types declared among parms in a prototype. */
6394 tree parmtags = current_function_parm_tags;
6396 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6397 register tree parmdecls = getdecls ();
6399 /* This is a chain of any other decls that came in among the parm
6400 declarations. If a parm is declared with enum {foo, bar} x;
6401 then CONST_DECLs for foo and bar are put here. */
6404 /* Nonzero if this definition is written with a prototype. */
6407 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6409 /* This case is when the function was defined with an ANSI prototype.
6410 The parms already have decls, so we need not do anything here
6411 except record them as in effect
6412 and complain if any redundant old-style parm decls were written. */
6423 error_with_decl (fndecl,
6424 "parm types given both in parmlist and separately");
6425 /* Get rid of the erroneous decls; don't keep them on
6426 the list of parms, since they might not be PARM_DECLs. */
6427 for (decl = current_binding_level->names;
6428 decl; decl = TREE_CHAIN (decl))
6429 if (DECL_NAME (decl))
6430 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6431 for (link = current_binding_level->shadowed;
6432 link; link = TREE_CHAIN (link))
6433 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6434 current_binding_level->names = 0;
6435 current_binding_level->shadowed = 0;
6438 specparms = nreverse (specparms);
6439 for (parm = specparms; parm; parm = next)
6441 next = TREE_CHAIN (parm);
6442 if (TREE_CODE (parm) == PARM_DECL)
6444 if (DECL_NAME (parm) == 0)
6445 error_with_decl (parm, "parameter name omitted");
6446 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6448 error_with_decl (parm, "parameter `%s' declared void");
6449 /* Change the type to error_mark_node so this parameter
6450 will be ignored by assign_parms. */
6451 TREE_TYPE (parm) = error_mark_node;
6457 /* If we find an enum constant or a type tag,
6458 put it aside for the moment. */
6459 TREE_CHAIN (parm) = 0;
6460 others = chainon (others, parm);
6464 /* Get the decls in their original chain order
6465 and record in the function. */
6466 DECL_ARGUMENTS (fndecl) = getdecls ();
6469 /* If this function takes a variable number of arguments,
6470 add a phony parameter to the end of the parm list,
6471 to represent the position of the first unnamed argument. */
6472 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6475 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6476 /* Let's hope the address of the unnamed parm
6477 won't depend on its type. */
6478 TREE_TYPE (dummy) = integer_type_node;
6479 DECL_ARG_TYPE (dummy) = integer_type_node;
6480 DECL_ARGUMENTS (fndecl)
6481 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6485 /* Now pushdecl the enum constants. */
6486 for (parm = others; parm; parm = next)
6488 next = TREE_CHAIN (parm);
6489 if (DECL_NAME (parm) == 0)
6491 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6493 else if (TREE_CODE (parm) != PARM_DECL)
6497 storetags (chainon (parmtags, gettags ()));
6501 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6502 each with a parm name as the TREE_VALUE.
6504 PARMDECLS is a chain of declarations for parameters.
6505 Warning! It can also contain CONST_DECLs which are not parameters
6506 but are names of enumerators of any enum types
6507 declared among the parameters.
6509 First match each formal parameter name with its declaration.
6510 Associate decls with the names and store the decls
6511 into the TREE_PURPOSE slots. */
6513 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6514 DECL_RESULT (parm) = 0;
6516 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6518 register tree tail, found = NULL;
6520 if (TREE_VALUE (parm) == 0)
6522 error_with_decl (fndecl, "parameter name missing from parameter list");
6523 TREE_PURPOSE (parm) = 0;
6527 /* See if any of the parmdecls specifies this parm by name.
6528 Ignore any enumerator decls. */
6529 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6530 if (DECL_NAME (tail) == TREE_VALUE (parm)
6531 && TREE_CODE (tail) == PARM_DECL)
6537 /* If declaration already marked, we have a duplicate name.
6538 Complain, and don't use this decl twice. */
6539 if (found && DECL_RESULT (found) != 0)
6541 error_with_decl (found, "multiple parameters named `%s'");
6545 /* If the declaration says "void", complain and ignore it. */
6546 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6548 error_with_decl (found, "parameter `%s' declared void");
6549 TREE_TYPE (found) = integer_type_node;
6550 DECL_ARG_TYPE (found) = integer_type_node;
6551 layout_decl (found, 0);
6554 /* Traditionally, a parm declared float is actually a double. */
6555 if (found && flag_traditional
6556 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6558 TREE_TYPE (found) = double_type_node;
6559 DECL_ARG_TYPE (found) = double_type_node;
6560 layout_decl (found, 0);
6563 /* If no declaration found, default to int. */
6566 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6568 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6569 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6570 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6572 warning_with_decl (found, "type of `%s' defaults to `int'");
6576 TREE_PURPOSE (parm) = found;
6578 /* Mark this decl as "already found" -- see test, above.
6579 It is safe to use DECL_RESULT for this
6580 since it is not used in PARM_DECLs or CONST_DECLs. */
6581 DECL_RESULT (found) = error_mark_node;
6584 /* Put anything which is on the parmdecls chain and which is
6585 not a PARM_DECL onto the list NONPARMS. (The types of
6586 non-parm things which might appear on the list include
6587 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6588 any actual PARM_DECLs not matched with any names. */
6591 for (parm = parmdecls; parm; )
6593 tree next = TREE_CHAIN (parm);
6594 TREE_CHAIN (parm) = 0;
6596 if (TREE_CODE (parm) != PARM_DECL)
6597 nonparms = chainon (nonparms, parm);
6600 /* Complain about args with incomplete types. */
6601 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6603 error_with_decl (parm, "parameter `%s' has incomplete type");
6604 TREE_TYPE (parm) = error_mark_node;
6607 if (DECL_RESULT (parm) == 0)
6609 error_with_decl (parm,
6610 "declaration for parameter `%s' but no such parameter");
6611 /* Pretend the parameter was not missing.
6612 This gets us to a standard state and minimizes
6613 further error messages. */
6615 = chainon (specparms,
6616 tree_cons (parm, NULL_TREE, NULL_TREE));
6623 /* Chain the declarations together in the order of the list of names. */
6624 /* Store that chain in the function decl, replacing the list of names. */
6626 DECL_ARGUMENTS (fndecl) = 0;
6629 for (last = 0; parm; parm = TREE_CHAIN (parm))
6630 if (TREE_PURPOSE (parm))
6633 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6635 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6636 last = TREE_PURPOSE (parm);
6637 TREE_CHAIN (last) = 0;
6641 /* If there was a previous prototype,
6642 set the DECL_ARG_TYPE of each argument according to
6643 the type previously specified, and report any mismatches. */
6645 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6648 for (parm = DECL_ARGUMENTS (fndecl),
6649 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6650 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6651 != void_type_node));
6652 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6654 if (parm == 0 || type == 0
6655 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6657 error ("number of arguments doesn't match prototype");
6658 error_with_file_and_line (current_function_prototype_file,
6659 current_function_prototype_line,
6660 "prototype declaration");
6663 /* Type for passing arg must be consistent
6664 with that declared for the arg. */
6665 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6667 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6668 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6670 /* Adjust argument to match prototype. E.g. a previous
6671 `int foo(float);' prototype causes
6672 `int foo(x) float x; {...}' to be treated like
6673 `int foo(float x) {...}'. This is particularly
6674 useful for argument types like uid_t. */
6675 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6676 #ifdef PROMOTE_PROTOTYPES
6677 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6678 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6679 && TYPE_PRECISION (TREE_TYPE (parm))
6680 < TYPE_PRECISION (integer_type_node))
6681 DECL_ARG_TYPE (parm) = integer_type_node;
6685 pedwarn ("promoted argument `%s' doesn't match prototype",
6686 IDENTIFIER_POINTER (DECL_NAME (parm)));
6687 warning_with_file_and_line
6688 (current_function_prototype_file,
6689 current_function_prototype_line,
6690 "prototype declaration");
6693 /* If -traditional, allow `int' argument to match
6694 `unsigned' prototype. */
6695 else if (! (flag_traditional
6696 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6697 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6699 error ("argument `%s' doesn't match prototype",
6700 IDENTIFIER_POINTER (DECL_NAME (parm)));
6701 error_with_file_and_line (current_function_prototype_file,
6702 current_function_prototype_line,
6703 "prototype declaration");
6707 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6710 /* Otherwise, create a prototype that would match. */
6714 tree actual = 0, last = 0, type;
6716 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6718 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6721 TREE_CHAIN (last) = type;
6726 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6728 TREE_CHAIN (last) = type;
6732 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6733 of the type of this function, but we need to avoid having this
6734 affect the types of other similarly-typed functions, so we must
6735 first force the generation of an identical (but separate) type
6736 node for the relevant function type. The new node we create
6737 will be a variant of the main variant of the original function
6740 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6742 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6745 /* Now store the final chain of decls for the arguments
6746 as the decl-chain of the current lexical scope.
6747 Put the enumerators in as well, at the front so that
6748 DECL_ARGUMENTS is not modified. */
6750 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6753 /* Make sure the binding level for the top of the function body
6754 gets a BLOCK if there are any in the function.
6755 Otherwise, the dbx output is wrong. */
6757 keep_next_if_subblocks = 1;
6759 /* ??? This might be an improvement,
6760 but needs to be thought about some more. */
6762 keep_next_level_flag = 1;
6765 /* Write a record describing this function definition to the prototypes
6766 file (if requested). */
6768 gen_aux_info_record (fndecl, 1, 0, prototype);
6770 /* Initialize the RTL code for the function. */
6772 init_function_start (fndecl, input_filename, lineno);
6774 /* If this is a varargs function, inform function.c. */
6776 if (c_function_varargs)
6779 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6781 declare_function_name ();
6783 /* Set up parameters and prepare for return, for the function. */
6785 expand_function_start (fndecl, 0);
6787 /* If this function is `main', emit a call to `__main'
6788 to run global initializers, etc. */
6789 if (DECL_NAME (fndecl)
6790 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6791 && DECL_CONTEXT (fndecl) == NULL_TREE)
6792 expand_main_function ();
6795 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6796 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6797 stands for an ellipsis in the identifier list.
6799 PARMLIST is the data returned by get_parm_info for the
6800 parmlist that follows the semicolon.
6802 We return a value of the same sort that get_parm_info returns,
6803 except that it describes the combination of identifiers and parmlist. */
6806 combine_parm_decls (specparms, parmlist, void_at_end)
6807 tree specparms, parmlist;
6810 register tree fndecl = current_function_decl;
6813 tree parmdecls = TREE_PURPOSE (parmlist);
6815 /* This is a chain of any other decls that came in among the parm
6816 declarations. They were separated already by get_parm_info,
6817 so we just need to keep them separate. */
6818 tree nonparms = TREE_VALUE (parmlist);
6822 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6823 DECL_RESULT (parm) = 0;
6825 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6827 register tree tail, found = NULL;
6829 /* See if any of the parmdecls specifies this parm by name. */
6830 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6831 if (DECL_NAME (tail) == TREE_VALUE (parm))
6837 /* If declaration already marked, we have a duplicate name.
6838 Complain, and don't use this decl twice. */
6839 if (found && DECL_RESULT (found) != 0)
6841 error_with_decl (found, "multiple parameters named `%s'");
6845 /* If the declaration says "void", complain and ignore it. */
6846 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6848 error_with_decl (found, "parameter `%s' declared void");
6849 TREE_TYPE (found) = integer_type_node;
6850 DECL_ARG_TYPE (found) = integer_type_node;
6851 layout_decl (found, 0);
6854 /* Traditionally, a parm declared float is actually a double. */
6855 if (found && flag_traditional
6856 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6858 TREE_TYPE (found) = double_type_node;
6859 DECL_ARG_TYPE (found) = double_type_node;
6860 layout_decl (found, 0);
6863 /* If no declaration found, default to int. */
6866 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6868 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6869 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6870 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6871 error_with_decl (found, "type of parameter `%s' is not declared");
6875 TREE_PURPOSE (parm) = found;
6877 /* Mark this decl as "already found" -- see test, above.
6878 It is safe to use DECL_RESULT for this
6879 since it is not used in PARM_DECLs or CONST_DECLs. */
6880 DECL_RESULT (found) = error_mark_node;
6883 /* Complain about any actual PARM_DECLs not matched with any names. */
6885 for (parm = parmdecls; parm; )
6887 tree next = TREE_CHAIN (parm);
6888 TREE_CHAIN (parm) = 0;
6890 /* Complain about args with incomplete types. */
6891 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6893 error_with_decl (parm, "parameter `%s' has incomplete type");
6894 TREE_TYPE (parm) = error_mark_node;
6897 if (DECL_RESULT (parm) == 0)
6899 error_with_decl (parm,
6900 "declaration for parameter `%s' but no such parameter");
6901 /* Pretend the parameter was not missing.
6902 This gets us to a standard state and minimizes
6903 further error messages. */
6905 = chainon (specparms,
6906 tree_cons (parm, NULL_TREE, NULL_TREE));
6912 /* Chain the declarations together in the order of the list of names.
6913 At the same time, build up a list of their types, in reverse order. */
6919 for (last = 0; parm; parm = TREE_CHAIN (parm))
6920 if (TREE_PURPOSE (parm))
6923 parmdecls = TREE_PURPOSE (parm);
6925 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6926 last = TREE_PURPOSE (parm);
6927 TREE_CHAIN (last) = 0;
6929 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6934 return saveable_tree_cons (parmdecls, nonparms,
6935 nreverse (saveable_tree_cons (NULL_TREE,
6939 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6942 /* Finish up a function declaration and compile that function
6943 all the way to assembler language output. The free the storage
6944 for the function definition.
6946 This is called after parsing the body of the function definition.
6948 NESTED is nonzero if the function being finished is nested in another. */
6951 finish_function (nested)
6954 register tree fndecl = current_function_decl;
6956 /* TREE_READONLY (fndecl) = 1;
6957 This caused &foo to be of type ptr-to-const-function
6958 which then got a warning when stored in a ptr-to-function variable. */
6961 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6963 /* Must mark the RESULT_DECL as being in this function. */
6965 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6967 /* Obey `register' declarations if `setjmp' is called in this fn. */
6968 if (flag_traditional && current_function_calls_setjmp)
6970 setjmp_protect (DECL_INITIAL (fndecl));
6971 setjmp_protect_args ();
6974 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6976 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6977 != integer_type_node)
6979 /* You would expect the sense of this test to be the other way
6980 around, but if warn_main is set, we will already have warned,
6981 so this would be a duplicate. This is the warning you get
6982 in some environments even if you *don't* ask for it, because
6983 these are environments where it may be more of a problem than
6986 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6990 #ifdef DEFAULT_MAIN_RETURN
6991 /* Make it so that `main' always returns success by default. */
6992 DEFAULT_MAIN_RETURN;
6997 /* Generate rtl for function exit. */
6998 expand_function_end (input_filename, lineno, 0);
7000 /* So we can tell if jump_optimize sets it to 1. */
7003 /* Run the optimizers and output the assembler code for this function. */
7004 rest_of_compilation (fndecl);
7006 current_function_returns_null |= can_reach_end;
7008 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7009 warning ("`noreturn' function does return");
7010 else if (warn_return_type && can_reach_end
7011 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7012 /* If this function returns non-void and control can drop through,
7014 warning ("control reaches end of non-void function");
7015 /* With just -W, complain only if function returns both with
7016 and without a value. */
7017 else if (extra_warnings
7018 && current_function_returns_value && current_function_returns_null)
7019 warning ("this function may return with or without a value");
7021 /* If requested, warn about function definitions where the function will
7022 return a value (usually of some struct or union type) which itself will
7023 take up a lot of stack space. */
7025 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7027 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7031 register tree ret_type_size = TYPE_SIZE (ret_type);
7033 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7036 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7038 if (units > larger_than_size)
7039 warning_with_decl (fndecl,
7040 "size of return value of `%s' is %u bytes",
7046 /* Free all the tree nodes making up this function. */
7047 /* Switch back to allocating nodes permanently
7048 until we start another function. */
7050 permanent_allocation (1);
7052 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7054 /* Stop pointing to the local nodes about to be freed. */
7055 /* But DECL_INITIAL must remain nonzero so we know this
7056 was an actual function definition. */
7057 /* For a nested function, this is done in pop_c_function_context. */
7058 /* If rest_of_compilation set this to 0, leave it 0. */
7059 if (DECL_INITIAL (fndecl) != 0)
7060 DECL_INITIAL (fndecl) = error_mark_node;
7061 DECL_ARGUMENTS (fndecl) = 0;
7064 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7066 #ifndef ASM_OUTPUT_CONSTRUCTOR
7067 if (! flag_gnu_linker)
7068 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7071 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7073 if (DECL_STATIC_DESTRUCTOR (fndecl))
7075 #ifndef ASM_OUTPUT_DESTRUCTOR
7076 if (! flag_gnu_linker)
7077 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7080 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7085 /* Let the error reporting routines know that we're outside a
7086 function. For a nested function, this value is used in
7087 pop_c_function_context and then reset via pop_function_context. */
7088 current_function_decl = NULL;
7092 /* Save and restore the variables in this file and elsewhere
7093 that keep track of the progress of compilation of the current function.
7094 Used for nested functions. */
7098 struct c_function *next;
7100 tree shadowed_labels;
7103 int warn_about_return_type;
7105 struct binding_level *binding_level;
7108 struct c_function *c_function_chain;
7110 /* Save and reinitialize the variables
7111 used during compilation of a C function. */
7114 push_c_function_context ()
7116 struct c_function *p
7117 = (struct c_function *) xmalloc (sizeof (struct c_function));
7120 pedwarn ("ANSI C forbids nested functions");
7122 push_function_context ();
7124 p->next = c_function_chain;
7125 c_function_chain = p;
7127 p->named_labels = named_labels;
7128 p->shadowed_labels = shadowed_labels;
7129 p->returns_value = current_function_returns_value;
7130 p->returns_null = current_function_returns_null;
7131 p->warn_about_return_type = warn_about_return_type;
7132 p->extern_inline = current_extern_inline;
7133 p->binding_level = current_binding_level;
7136 /* Restore the variables used during compilation of a C function. */
7139 pop_c_function_context ()
7141 struct c_function *p = c_function_chain;
7144 /* Bring back all the labels that were shadowed. */
7145 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7146 if (DECL_NAME (TREE_VALUE (link)) != 0)
7147 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7148 = TREE_VALUE (link);
7150 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7152 /* Stop pointing to the local nodes about to be freed. */
7153 /* But DECL_INITIAL must remain nonzero so we know this
7154 was an actual function definition. */
7155 DECL_INITIAL (current_function_decl) = error_mark_node;
7156 DECL_ARGUMENTS (current_function_decl) = 0;
7159 pop_function_context ();
7161 c_function_chain = p->next;
7163 named_labels = p->named_labels;
7164 shadowed_labels = p->shadowed_labels;
7165 current_function_returns_value = p->returns_value;
7166 current_function_returns_null = p->returns_null;
7167 warn_about_return_type = p->warn_about_return_type;
7168 current_extern_inline = p->extern_inline;
7169 current_binding_level = p->binding_level;
7174 /* integrate_decl_tree calls this function, but since we don't use the
7175 DECL_LANG_SPECIFIC field, this is a no-op. */
7178 copy_lang_decl (node)