1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-98, 1999 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. */
41 extern cpp_reader parse_in;
44 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
46 { NORMAL, /* Ordinary declaration */
47 FUNCDEF, /* Function definition */
48 PARM, /* Declaration of parm before function body */
49 FIELD, /* Declaration inside struct or union */
50 BITFIELD, /* Likewise but with specified width */
51 TYPENAME}; /* Typename (inside cast or sizeof) */
53 #ifndef CHAR_TYPE_SIZE
54 #define CHAR_TYPE_SIZE BITS_PER_UNIT
57 #ifndef SHORT_TYPE_SIZE
58 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
62 #define INT_TYPE_SIZE BITS_PER_WORD
65 #ifndef LONG_TYPE_SIZE
66 #define LONG_TYPE_SIZE BITS_PER_WORD
69 #ifndef LONG_LONG_TYPE_SIZE
70 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
73 #ifndef WCHAR_UNSIGNED
74 #define WCHAR_UNSIGNED 0
77 #ifndef FLOAT_TYPE_SIZE
78 #define FLOAT_TYPE_SIZE BITS_PER_WORD
81 #ifndef DOUBLE_TYPE_SIZE
82 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
85 #ifndef LONG_DOUBLE_TYPE_SIZE
86 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
89 /* We let tm.h override the types used here, to handle trivial differences
90 such as the choice of unsigned int or long unsigned int for size_t.
91 When machines start needing nontrivial differences in the size type,
92 it would be best to do something here to figure out automatically
93 from other information what type to use. */
96 #define SIZE_TYPE "long unsigned int"
100 #define PTRDIFF_TYPE "long int"
104 #define WCHAR_TYPE "int"
107 /* a node which has tree code ERROR_MARK, and whose type is itself.
108 All erroneous expressions are replaced with this node. All functions
109 that accept nodes as arguments should avoid generating error messages
110 if this node is one of the arguments, since it is undesirable to get
111 multiple error messages from one error in the input. */
113 tree error_mark_node;
115 /* These can't be part of the above array, since they are declared
116 individually in tree.h, and used by the debug output routines. */
120 tree integer_type_node;
121 tree unsigned_type_node;
123 /* These can't be part of the above array, since they are declared
124 individially in tree.h and used by the target routines. */
127 tree va_list_type_node;
129 /* Two expressions that are constants with value zero.
130 The first is of type `int', the second of type `void *'. */
132 tree integer_zero_node;
133 tree null_pointer_node;
135 /* A node for the integer constant 1. */
137 tree integer_one_node;
139 /* Nonzero if we have seen an invalid cross reference
140 to a struct, union, or enum, but not yet printed the message. */
142 tree pending_invalid_xref;
143 /* File and line to appear in the eventual error message. */
144 char *pending_invalid_xref_file;
145 int pending_invalid_xref_line;
147 /* While defining an enum type, this is 1 plus the last enumerator
148 constant value. Note that will do not have to save this or `enum_overflow'
149 around nested function definition since such a definition could only
150 occur in an enum value expression and we don't use these variables in
153 static tree enum_next_value;
155 /* Nonzero means that there was overflow computing enum_next_value. */
157 static int enum_overflow;
159 /* Parsing a function declarator leaves a list of parameter names
160 or a chain or parameter decls here. */
162 static tree last_function_parms;
164 /* Parsing a function declarator leaves here a chain of structure
165 and enum types declared in the parmlist. */
167 static tree last_function_parm_tags;
169 /* After parsing the declarator that starts a function definition,
170 `start_function' puts here the list of parameter names or chain of decls.
171 `store_parm_decls' finds it here. */
173 static tree current_function_parms;
175 /* Similar, for last_function_parm_tags. */
176 static tree current_function_parm_tags;
178 /* Similar, for the file and line that the prototype came from if this is
179 an old-style definition. */
180 static char *current_function_prototype_file;
181 static int current_function_prototype_line;
183 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
184 that have names. Here so we can clear out their names' definitions
185 at the end of the function. */
187 static tree named_labels;
189 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
191 static tree shadowed_labels;
193 /* Nonzero when store_parm_decls is called indicates a varargs function.
194 Value not meaningful after store_parm_decls. */
196 static int c_function_varargs;
198 /* The FUNCTION_DECL for the function currently being compiled,
199 or 0 if between functions. */
200 tree current_function_decl;
202 /* Set to 0 at beginning of a function definition, set to 1 if
203 a return statement that specifies a return value is seen. */
205 int current_function_returns_value;
207 /* Set to 0 at beginning of a function definition, set to 1 if
208 a return statement with no argument is seen. */
210 int current_function_returns_null;
212 /* Set to nonzero by `grokdeclarator' for a function
213 whose return type is defaulted, if warnings for this are desired. */
215 static int warn_about_return_type;
217 /* Nonzero when starting a function declared `extern inline'. */
219 static int current_extern_inline;
221 /* For each binding contour we allocate a binding_level structure
222 * which records the names defined in that contour.
225 * 1) one for each function definition,
226 * where internal declarations of the parameters appear.
227 * 2) one for each compound statement,
228 * to record its declarations.
230 * The current meaning of a name can be found by searching the levels from
231 * the current one out to the global one.
234 /* Note that the information in the `names' component of the global contour
235 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
239 /* A chain of _DECL nodes for all variables, constants, functions,
240 and typedef types. These are in the reverse of the order supplied.
244 /* A list of structure, union and enum definitions,
245 * for looking up tag names.
246 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
247 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
248 * or ENUMERAL_TYPE node.
252 /* For each level, a list of shadowed outer-level local definitions
253 to be restored when this level is popped.
254 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
255 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
258 /* For each level (except not the global one),
259 a chain of BLOCK nodes for all the levels
260 that were entered and exited one level down. */
263 /* The BLOCK node for this level, if one has been preallocated.
264 If 0, the BLOCK is allocated (if needed) when the level is popped. */
267 /* The binding level which this one is contained in (inherits from). */
268 struct binding_level *level_chain;
270 /* Nonzero for the level that holds the parameters of a function. */
273 /* Nonzero if this level "doesn't exist" for tags. */
274 char tag_transparent;
276 /* Nonzero if sublevels of this level "don't exist" for tags.
277 This is set in the parm level of a function definition
278 while reading the function body, so that the outermost block
279 of the function body will be tag-transparent. */
280 char subblocks_tag_transparent;
282 /* Nonzero means make a BLOCK for this level regardless of all else. */
285 /* Nonzero means make a BLOCK if this level has any subblocks. */
286 char keep_if_subblocks;
288 /* Number of decls in `names' that have incomplete
289 structure or union types. */
292 /* A list of decls giving the (reversed) specified order of parms,
293 not including any forward-decls in the parmlist.
294 This is so we can put the parms in proper order for assign_parms. */
298 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
300 /* The binding level currently in effect. */
302 static struct binding_level *current_binding_level;
304 /* A chain of binding_level structures awaiting reuse. */
306 static struct binding_level *free_binding_level;
308 /* The outermost binding level, for names of file scope.
309 This is created when the compiler is started and exists
310 through the entire run. */
312 static struct binding_level *global_binding_level;
314 /* Binding level structures are initialized by copying this one. */
316 static struct binding_level clear_binding_level
317 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
320 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
322 static int keep_next_level_flag;
324 /* Nonzero means make a BLOCK for the next level pushed
325 if it has subblocks. */
327 static int keep_next_if_subblocks;
329 /* The chain of outer levels of label scopes.
330 This uses the same data structure used for binding levels,
331 but it works differently: each link in the chain records
332 saved values of named_labels and shadowed_labels for
333 a label binding level outside the current one. */
335 static struct binding_level *label_level_chain;
337 /* Functions called automatically at the beginning and end of execution. */
339 tree static_ctors, static_dtors;
341 /* Forward declarations. */
343 static struct binding_level * make_binding_level PROTO((void));
344 static void clear_limbo_values PROTO((tree));
345 static int duplicate_decls PROTO((tree, tree, int));
346 static int redeclaration_error_message PROTO((tree, tree));
347 static void storedecls PROTO((tree));
348 static void storetags PROTO((tree));
349 static tree lookup_tag PROTO((enum tree_code, tree,
350 struct binding_level *, int));
351 static tree lookup_tag_reverse PROTO((tree));
352 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
354 static tree grokparms PROTO((tree, int));
355 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
356 static void layout_array_type PROTO((tree));
358 /* C-specific option variables. */
360 /* Nonzero means allow type mismatches in conditional expressions;
361 just make their values `void'. */
363 int flag_cond_mismatch;
365 /* Nonzero means give `double' the same size as `float'. */
367 int flag_short_double;
369 /* Nonzero means don't recognize the keyword `asm'. */
373 /* Nonzero means don't recognize any builtin functions. */
377 /* Nonzero means don't recognize the non-ANSI builtin functions.
380 int flag_no_nonansi_builtin;
382 /* Nonzero means do some things the same way PCC does. */
384 int flag_traditional;
386 /* Nonzero means use the ISO C9x dialect of C. */
390 /* Nonzero means that we have builtin functions, and main is an int */
394 /* Nonzero means to allow single precision math even if we're generally
395 being traditional. */
396 int flag_allow_single_precision = 0;
398 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
400 int flag_signed_bitfields = 1;
401 int explicit_flag_signed_bitfields = 0;
403 /* Nonzero means warn about use of implicit int. */
405 int warn_implicit_int;
407 /* Nonzero means warn about usage of long long when `-pedantic'. */
409 int warn_long_long = 1;
411 /* Nonzero means message about use of implicit function declarations;
412 1 means warning; 2 means error. */
414 int mesg_implicit_function_declaration;
416 /* Nonzero means give string constants the type `const char *'
417 to get extra warnings from them. These warnings will be too numerous
418 to be useful, except in thoroughly ANSIfied programs. */
420 int flag_const_strings;
422 /* Nonzero means warn about pointer casts that can drop a type qualifier
423 from the pointer target type. */
427 /* Nonzero means warn when casting a function call to a type that does
428 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
429 when there is no previous declaration of sqrt or malloc. */
431 int warn_bad_function_cast;
433 /* Warn about functions which might be candidates for attribute noreturn. */
435 int warn_missing_noreturn;
437 /* Warn about traditional constructs whose meanings changed in ANSI C. */
439 int warn_traditional;
441 /* Nonzero means warn about sizeof(function) or addition/subtraction
442 of function pointers. */
444 int warn_pointer_arith;
446 /* Nonzero means warn for non-prototype function decls
447 or non-prototyped defs without previous prototype. */
449 int warn_strict_prototypes;
451 /* Nonzero means warn for any global function def
452 without separate previous prototype decl. */
454 int warn_missing_prototypes;
456 /* Nonzero means warn for any global function def
457 without separate previous decl. */
459 int warn_missing_declarations;
461 /* Nonzero means warn about multiple (redundant) decls for the same single
462 variable or function. */
464 int warn_redundant_decls = 0;
466 /* Nonzero means warn about extern declarations of objects not at
467 file-scope level and about *all* declarations of functions (whether
468 extern or static) not at file-scope level. Note that we exclude
469 implicit function declarations. To get warnings about those, use
472 int warn_nested_externs = 0;
474 /* Warn about *printf or *scanf format/argument anomalies. */
478 /* Warn about a subscript that has type char. */
480 int warn_char_subscripts = 0;
482 /* Warn if a type conversion is done that might have confusing results. */
486 /* Warn if adding () is suggested. */
488 int warn_parentheses;
490 /* Warn if initializer is not completely bracketed. */
492 int warn_missing_braces;
494 /* Warn if main is suspicious. */
498 /* Warn about #pragma directives that are not recognised. */
500 int warn_unknown_pragmas = 0; /* Tri state variable. */
502 /* Warn about comparison of signed and unsigned values.
503 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
505 int warn_sign_compare = -1;
507 /* Nonzero means warn about use of multicharacter literals. */
509 int warn_multichar = 1;
511 /* Nonzero means `$' can be in an identifier. */
513 #ifndef DOLLARS_IN_IDENTIFIERS
514 #define DOLLARS_IN_IDENTIFIERS 1
516 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
518 /* Decode the string P as a language-specific option for C.
519 Return the number of strings consumed. */
522 c_decode_option (argc, argv)
523 int argc ATTRIBUTE_UNUSED;
526 int strings_processed;
529 strings_processed = cpp_handle_option (&parse_in, argc, argv);
531 strings_processed = 0;
532 #endif /* ! USE_CPPLIB */
534 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
536 flag_traditional = 1;
537 flag_writable_strings = 1;
539 else if (!strcmp (p, "-fallow-single-precision"))
540 flag_allow_single_precision = 1;
541 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
546 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
550 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
554 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
556 flag_traditional = 0;
557 flag_writable_strings = 0;
559 else if (!strncmp (p, "-std=", 5))
561 /* Select the appropriate language standard. We currently
563 -std=iso9899:1990 same as -ansi
564 -std=iso9899:199409 ISO C as modified in amend. 1
565 -std=iso9899:199x ISO C 9x
566 -std=c89 same as -std=iso9899:1990
567 -std=c9x same as -std=iso9899:199x
568 -std=gnu89 default, iso9899:1990 + gnu extensions
569 -std=gnu9x iso9899:199x + gnu extensions
571 const char *argstart = &p[5];
573 if (!strcmp (argstart, "iso9899:1990")
574 || !strcmp (argstart, "c89"))
577 flag_traditional = 0;
578 flag_writable_strings = 0;
580 flag_no_nonansi_builtin = 1;
583 else if (!strcmp (argstart, "iso9899:199409"))
585 /* ??? The changes since ISO C 1990 are not supported. */
588 else if (!strcmp (argstart, "iso9899:199x")
589 || !strcmp (argstart, "c9x"))
591 flag_traditional = 0;
592 flag_writable_strings = 0;
594 flag_no_nonansi_builtin = 1;
597 else if (!strcmp (argstart, "gnu89"))
599 flag_traditional = 0;
600 flag_writable_strings = 0;
602 flag_no_nonansi_builtin = 0;
605 else if (!strcmp (argstart, "gnu9x"))
607 flag_traditional = 0;
608 flag_writable_strings = 0;
610 flag_no_nonansi_builtin = 0;
614 error ("unknown C standard `%s'", argstart);
616 else if (!strcmp (p, "-fdollars-in-identifiers"))
617 dollars_in_ident = 1;
618 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
619 dollars_in_ident = 0;
620 else if (!strcmp (p, "-fsigned-char"))
621 flag_signed_char = 1;
622 else if (!strcmp (p, "-funsigned-char"))
623 flag_signed_char = 0;
624 else if (!strcmp (p, "-fno-signed-char"))
625 flag_signed_char = 0;
626 else if (!strcmp (p, "-fno-unsigned-char"))
627 flag_signed_char = 1;
628 else if (!strcmp (p, "-fsigned-bitfields")
629 || !strcmp (p, "-fno-unsigned-bitfields"))
631 flag_signed_bitfields = 1;
632 explicit_flag_signed_bitfields = 1;
634 else if (!strcmp (p, "-funsigned-bitfields")
635 || !strcmp (p, "-fno-signed-bitfields"))
637 flag_signed_bitfields = 0;
638 explicit_flag_signed_bitfields = 1;
640 else if (!strcmp (p, "-fshort-enums"))
641 flag_short_enums = 1;
642 else if (!strcmp (p, "-fno-short-enums"))
643 flag_short_enums = 0;
644 else if (!strcmp (p, "-fcond-mismatch"))
645 flag_cond_mismatch = 1;
646 else if (!strcmp (p, "-fno-cond-mismatch"))
647 flag_cond_mismatch = 0;
648 else if (!strcmp (p, "-fshort-double"))
649 flag_short_double = 1;
650 else if (!strcmp (p, "-fno-short-double"))
651 flag_short_double = 0;
652 else if (!strcmp (p, "-fasm"))
654 else if (!strcmp (p, "-fno-asm"))
656 else if (!strcmp (p, "-fbuiltin"))
658 else if (!strcmp (p, "-fno-builtin"))
660 else if (!strcmp (p, "-ansi"))
662 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
663 mesg_implicit_function_declaration = 2;
664 else if (!strcmp (p, "-Wimplicit-function-declaration"))
665 mesg_implicit_function_declaration = 1;
666 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
667 mesg_implicit_function_declaration = 0;
668 else if (!strcmp (p, "-Wimplicit-int"))
669 warn_implicit_int = 1;
670 else if (!strcmp (p, "-Wno-implicit-int"))
671 warn_implicit_int = 0;
672 else if (!strcmp (p, "-Wimplicit"))
674 warn_implicit_int = 1;
675 if (mesg_implicit_function_declaration != 2)
676 mesg_implicit_function_declaration = 1;
678 else if (!strcmp (p, "-Wno-implicit"))
679 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
680 else if (!strcmp (p, "-Wlong-long"))
682 else if (!strcmp (p, "-Wno-long-long"))
684 else if (!strcmp (p, "-Wwrite-strings"))
685 flag_const_strings = 1;
686 else if (!strcmp (p, "-Wno-write-strings"))
687 flag_const_strings = 0;
688 else if (!strcmp (p, "-Wcast-qual"))
690 else if (!strcmp (p, "-Wno-cast-qual"))
692 else if (!strcmp (p, "-Wbad-function-cast"))
693 warn_bad_function_cast = 1;
694 else if (!strcmp (p, "-Wno-bad-function-cast"))
695 warn_bad_function_cast = 0;
696 else if (!strcmp (p, "-Wmissing-noreturn"))
697 warn_missing_noreturn = 1;
698 else if (!strcmp (p, "-Wno-missing-noreturn"))
699 warn_missing_noreturn = 0;
700 else if (!strcmp (p, "-Wpointer-arith"))
701 warn_pointer_arith = 1;
702 else if (!strcmp (p, "-Wno-pointer-arith"))
703 warn_pointer_arith = 0;
704 else if (!strcmp (p, "-Wstrict-prototypes"))
705 warn_strict_prototypes = 1;
706 else if (!strcmp (p, "-Wno-strict-prototypes"))
707 warn_strict_prototypes = 0;
708 else if (!strcmp (p, "-Wmissing-prototypes"))
709 warn_missing_prototypes = 1;
710 else if (!strcmp (p, "-Wno-missing-prototypes"))
711 warn_missing_prototypes = 0;
712 else if (!strcmp (p, "-Wmissing-declarations"))
713 warn_missing_declarations = 1;
714 else if (!strcmp (p, "-Wno-missing-declarations"))
715 warn_missing_declarations = 0;
716 else if (!strcmp (p, "-Wredundant-decls"))
717 warn_redundant_decls = 1;
718 else if (!strcmp (p, "-Wno-redundant-decls"))
719 warn_redundant_decls = 0;
720 else if (!strcmp (p, "-Wnested-externs"))
721 warn_nested_externs = 1;
722 else if (!strcmp (p, "-Wno-nested-externs"))
723 warn_nested_externs = 0;
724 else if (!strcmp (p, "-Wtraditional"))
725 warn_traditional = 1;
726 else if (!strcmp (p, "-Wno-traditional"))
727 warn_traditional = 0;
728 else if (!strcmp (p, "-Wformat"))
730 else if (!strcmp (p, "-Wno-format"))
732 else if (!strcmp (p, "-Wchar-subscripts"))
733 warn_char_subscripts = 1;
734 else if (!strcmp (p, "-Wno-char-subscripts"))
735 warn_char_subscripts = 0;
736 else if (!strcmp (p, "-Wconversion"))
738 else if (!strcmp (p, "-Wno-conversion"))
740 else if (!strcmp (p, "-Wparentheses"))
741 warn_parentheses = 1;
742 else if (!strcmp (p, "-Wno-parentheses"))
743 warn_parentheses = 0;
744 else if (!strcmp (p, "-Wreturn-type"))
745 warn_return_type = 1;
746 else if (!strcmp (p, "-Wno-return-type"))
747 warn_return_type = 0;
748 else if (!strcmp (p, "-Wcomment"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wno-comment"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wcomments"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wno-comments"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wtrigraphs"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wno-trigraphs"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wundef"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wno-undef"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wimport"))
765 ; /* cpp handles this one. */
766 else if (!strcmp (p, "-Wno-import"))
767 ; /* cpp handles this one. */
768 else if (!strcmp (p, "-Wmissing-braces"))
769 warn_missing_braces = 1;
770 else if (!strcmp (p, "-Wno-missing-braces"))
771 warn_missing_braces = 0;
772 else if (!strcmp (p, "-Wmain"))
774 else if (!strcmp (p, "-Wno-main"))
776 else if (!strcmp (p, "-Wsign-compare"))
777 warn_sign_compare = 1;
778 else if (!strcmp (p, "-Wno-sign-compare"))
779 warn_sign_compare = 0;
780 else if (!strcmp (p, "-Wmultichar"))
782 else if (!strcmp (p, "-Wno-multichar"))
784 else if (!strcmp (p, "-Wunknown-pragmas"))
785 /* Set to greater than 1, so that even unknown pragmas in system
786 headers will be warned about. */
787 warn_unknown_pragmas = 2;
788 else if (!strcmp (p, "-Wno-unknown-pragmas"))
789 warn_unknown_pragmas = 0;
790 else if (!strcmp (p, "-Wall"))
792 /* We save the value of warn_uninitialized, since if they put
793 -Wuninitialized on the command line, we need to generate a
794 warning about not using it without also specifying -O. */
795 if (warn_uninitialized != 1)
796 warn_uninitialized = 2;
797 warn_implicit_int = 1;
798 mesg_implicit_function_declaration = 1;
799 warn_return_type = 1;
803 warn_char_subscripts = 1;
804 warn_parentheses = 1;
805 warn_missing_braces = 1;
806 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
807 it off only if it's not explicit. */
809 /* Only warn about unknown pragmas that are not in system headers. */
810 warn_unknown_pragmas = 1;
813 return strings_processed;
818 /* Hooks for print_node. */
821 print_lang_decl (file, node, indent)
822 FILE *file ATTRIBUTE_UNUSED;
823 tree node ATTRIBUTE_UNUSED;
824 int indent ATTRIBUTE_UNUSED;
829 print_lang_type (file, node, indent)
830 FILE *file ATTRIBUTE_UNUSED;
831 tree node ATTRIBUTE_UNUSED;
832 int indent ATTRIBUTE_UNUSED;
837 print_lang_identifier (file, node, indent)
842 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
843 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
844 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
845 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
846 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
847 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
850 /* Hook called at end of compilation to assume 1 elt
851 for a top-level array decl that wasn't complete before. */
854 finish_incomplete_decl (decl)
857 if (TREE_CODE (decl) == VAR_DECL)
859 tree type = TREE_TYPE (decl);
860 if (type != error_mark_node
861 && TREE_CODE (type) == ARRAY_TYPE
862 && TYPE_DOMAIN (type) == 0)
864 if (! DECL_EXTERNAL (decl))
865 warning_with_decl (decl, "array `%s' assumed to have one element");
867 complete_array_type (type, NULL_TREE, 1);
869 layout_decl (decl, 0);
874 /* Create a new `struct binding_level'. */
877 struct binding_level *
878 make_binding_level ()
881 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
884 /* Nonzero if we are currently in the global binding level. */
889 return current_binding_level == global_binding_level;
895 keep_next_level_flag = 1;
898 /* Nonzero if the current level needs to have a BLOCK made. */
903 return ((current_binding_level->keep_if_subblocks
904 && current_binding_level->blocks != 0)
905 || current_binding_level->keep
906 || current_binding_level->names != 0
907 || (current_binding_level->tags != 0
908 && !current_binding_level->tag_transparent));
911 /* Identify this binding level as a level of parameters.
912 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
913 But it turns out there is no way to pass the right value for
914 DEFINITION_FLAG, so we ignore it. */
917 declare_parm_level (definition_flag)
918 int definition_flag ATTRIBUTE_UNUSED;
920 current_binding_level->parm_flag = 1;
923 /* Nonzero if currently making parm declarations. */
928 return current_binding_level->parm_flag;
931 /* Enter a new binding level.
932 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
933 not for that of tags. */
936 pushlevel (tag_transparent)
939 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
941 /* If this is the top level of a function,
942 just make sure that NAMED_LABELS is 0. */
944 if (current_binding_level == global_binding_level)
949 /* Reuse or create a struct for this binding level. */
951 if (free_binding_level)
953 newlevel = free_binding_level;
954 free_binding_level = free_binding_level->level_chain;
958 newlevel = make_binding_level ();
961 /* Add this level to the front of the chain (stack) of levels that
964 *newlevel = clear_binding_level;
965 newlevel->tag_transparent
967 || (current_binding_level
968 ? current_binding_level->subblocks_tag_transparent
970 newlevel->level_chain = current_binding_level;
971 current_binding_level = newlevel;
972 newlevel->keep = keep_next_level_flag;
973 keep_next_level_flag = 0;
974 newlevel->keep_if_subblocks = keep_next_if_subblocks;
975 keep_next_if_subblocks = 0;
978 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
981 clear_limbo_values (block)
986 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
987 if (DECL_NAME (tem) != 0)
988 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
990 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
991 clear_limbo_values (tem);
994 /* Exit a binding level.
995 Pop the level off, and restore the state of the identifier-decl mappings
996 that were in effect when this level was entered.
998 If KEEP is nonzero, this level had explicit declarations, so
999 and create a "block" (a BLOCK node) for the level
1000 to record its declarations and subblocks for symbol table output.
1002 If FUNCTIONBODY is nonzero, this level is the body of a function,
1003 so create a block as if KEEP were set and also clear out all
1006 If REVERSE is nonzero, reverse the order of decls before putting
1007 them into the BLOCK. */
1010 poplevel (keep, reverse, functionbody)
1016 /* The chain of decls was accumulated in reverse order.
1017 Put it into forward order, just for cleanliness. */
1019 tree tags = current_binding_level->tags;
1020 tree subblocks = current_binding_level->blocks;
1023 int block_previously_created;
1025 keep |= current_binding_level->keep;
1027 /* This warning is turned off because it causes warnings for
1028 declarations like `extern struct foo *x'. */
1030 /* Warn about incomplete structure types in this level. */
1031 for (link = tags; link; link = TREE_CHAIN (link))
1032 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1034 tree type = TREE_VALUE (link);
1035 tree type_name = TYPE_NAME (type);
1036 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1038 : DECL_NAME (type_name));
1039 switch (TREE_CODE (type))
1042 error ("`struct %s' incomplete in scope ending here", id);
1045 error ("`union %s' incomplete in scope ending here", id);
1048 error ("`enum %s' incomplete in scope ending here", id);
1054 /* Get the decls in the order they were written.
1055 Usually current_binding_level->names is in reverse order.
1056 But parameter decls were previously put in forward order. */
1059 current_binding_level->names
1060 = decls = nreverse (current_binding_level->names);
1062 decls = current_binding_level->names;
1064 /* Output any nested inline functions within this block
1065 if they weren't already output. */
1067 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1068 if (TREE_CODE (decl) == FUNCTION_DECL
1069 && ! TREE_ASM_WRITTEN (decl)
1070 && DECL_INITIAL (decl) != 0
1071 && TREE_ADDRESSABLE (decl))
1073 /* If this decl was copied from a file-scope decl
1074 on account of a block-scope extern decl,
1075 propagate TREE_ADDRESSABLE to the file-scope decl.
1077 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1078 true, since then the decl goes through save_for_inline_copying. */
1079 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1080 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1081 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1082 else if (DECL_SAVED_INSNS (decl) != 0)
1084 push_function_context ();
1085 output_inline_function (decl);
1086 pop_function_context ();
1090 /* If there were any declarations or structure tags in that level,
1091 or if this level is a function body,
1092 create a BLOCK to record them for the life of this function. */
1095 block_previously_created = (current_binding_level->this_block != 0);
1096 if (block_previously_created)
1097 block = current_binding_level->this_block;
1098 else if (keep || functionbody
1099 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1100 block = make_node (BLOCK);
1103 BLOCK_VARS (block) = decls;
1104 BLOCK_TYPE_TAGS (block) = tags;
1105 BLOCK_SUBBLOCKS (block) = subblocks;
1106 remember_end_note (block);
1109 /* In each subblock, record that this is its superior. */
1111 for (link = subblocks; link; link = TREE_CHAIN (link))
1112 BLOCK_SUPERCONTEXT (link) = block;
1114 /* Clear out the meanings of the local variables of this level. */
1116 for (link = decls; link; link = TREE_CHAIN (link))
1118 if (DECL_NAME (link) != 0)
1120 /* If the ident. was used or addressed via a local extern decl,
1121 don't forget that fact. */
1122 if (DECL_EXTERNAL (link))
1124 if (TREE_USED (link))
1125 TREE_USED (DECL_NAME (link)) = 1;
1126 if (TREE_ADDRESSABLE (link))
1127 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1129 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1133 /* Restore all name-meanings of the outer levels
1134 that were shadowed by this level. */
1136 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1137 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1139 /* If the level being exited is the top level of a function,
1140 check over all the labels, and clear out the current
1141 (function local) meanings of their names. */
1145 clear_limbo_values (block);
1147 /* If this is the top level block of a function,
1148 the vars are the function's parameters.
1149 Don't leave them in the BLOCK because they are
1150 found in the FUNCTION_DECL instead. */
1152 BLOCK_VARS (block) = 0;
1154 /* Clear out the definitions of all label names,
1155 since their scopes end here,
1156 and add them to BLOCK_VARS. */
1158 for (link = named_labels; link; link = TREE_CHAIN (link))
1160 register tree label = TREE_VALUE (link);
1162 if (DECL_INITIAL (label) == 0)
1164 error_with_decl (label, "label `%s' used but not defined");
1165 /* Avoid crashing later. */
1166 define_label (input_filename, lineno,
1169 else if (warn_unused && !TREE_USED (label))
1170 warning_with_decl (label, "label `%s' defined but not used");
1171 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1173 /* Put the labels into the "variables" of the
1174 top-level block, so debugger can see them. */
1175 TREE_CHAIN (label) = BLOCK_VARS (block);
1176 BLOCK_VARS (block) = label;
1180 /* Pop the current level, and free the structure for reuse. */
1183 register struct binding_level *level = current_binding_level;
1184 current_binding_level = current_binding_level->level_chain;
1186 level->level_chain = free_binding_level;
1187 free_binding_level = level;
1190 /* Dispose of the block that we just made inside some higher level. */
1192 DECL_INITIAL (current_function_decl) = block;
1195 if (!block_previously_created)
1196 current_binding_level->blocks
1197 = chainon (current_binding_level->blocks, block);
1199 /* If we did not make a block for the level just exited,
1200 any blocks made for inner levels
1201 (since they cannot be recorded as subblocks in that level)
1202 must be carried forward so they will later become subblocks
1203 of something else. */
1205 current_binding_level->blocks
1206 = chainon (current_binding_level->blocks, subblocks);
1208 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1209 binding contour so that they point to the appropriate construct, i.e.
1210 either to the current FUNCTION_DECL node, or else to the BLOCK node
1211 we just constructed.
1213 Note that for tagged types whose scope is just the formal parameter
1214 list for some function type specification, we can't properly set
1215 their TYPE_CONTEXTs here, because we don't have a pointer to the
1216 appropriate FUNCTION_TYPE node readily available to us. For those
1217 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1218 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1219 node which will represent the "scope" for these "parameter list local"
1224 for (link = tags; link; link = TREE_CHAIN (link))
1225 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1227 for (link = tags; link; link = TREE_CHAIN (link))
1228 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1231 TREE_USED (block) = 1;
1235 /* Delete the node BLOCK from the current binding level.
1236 This is used for the block inside a stmt expr ({...})
1237 so that the block can be reinserted where appropriate. */
1240 delete_block (block)
1244 if (current_binding_level->blocks == block)
1245 current_binding_level->blocks = TREE_CHAIN (block);
1246 for (t = current_binding_level->blocks; t;)
1248 if (TREE_CHAIN (t) == block)
1249 TREE_CHAIN (t) = TREE_CHAIN (block);
1253 TREE_CHAIN (block) = NULL;
1254 /* Clear TREE_USED which is always set by poplevel.
1255 The flag is set again if insert_block is called. */
1256 TREE_USED (block) = 0;
1259 /* Insert BLOCK at the end of the list of subblocks of the
1260 current binding level. This is used when a BIND_EXPR is expanded,
1261 to handle the BLOCK node inside the BIND_EXPR. */
1264 insert_block (block)
1267 TREE_USED (block) = 1;
1268 current_binding_level->blocks
1269 = chainon (current_binding_level->blocks, block);
1272 /* Set the BLOCK node for the innermost scope
1273 (the one we are currently in). */
1277 register tree block;
1279 current_binding_level->this_block = block;
1285 register struct binding_level *newlevel;
1287 /* Reuse or create a struct for this binding level. */
1289 if (free_binding_level)
1291 newlevel = free_binding_level;
1292 free_binding_level = free_binding_level->level_chain;
1296 newlevel = make_binding_level ();
1299 /* Add this level to the front of the chain (stack) of label levels. */
1301 newlevel->level_chain = label_level_chain;
1302 label_level_chain = newlevel;
1304 newlevel->names = named_labels;
1305 newlevel->shadowed = shadowed_labels;
1307 shadowed_labels = 0;
1313 register struct binding_level *level = label_level_chain;
1316 /* Clear out the definitions of the declared labels in this level.
1317 Leave in the list any ordinary, non-declared labels. */
1318 for (link = named_labels, prev = 0; link;)
1320 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1322 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1324 error_with_decl (TREE_VALUE (link),
1325 "label `%s' used but not defined");
1326 /* Avoid crashing later. */
1327 define_label (input_filename, lineno,
1328 DECL_NAME (TREE_VALUE (link)));
1330 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1331 warning_with_decl (TREE_VALUE (link),
1332 "label `%s' defined but not used");
1333 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1335 /* Delete this element from the list. */
1336 link = TREE_CHAIN (link);
1338 TREE_CHAIN (prev) = link;
1340 named_labels = link;
1345 link = TREE_CHAIN (link);
1349 /* Bring back all the labels that were shadowed. */
1350 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1351 if (DECL_NAME (TREE_VALUE (link)) != 0)
1352 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1353 = TREE_VALUE (link);
1355 named_labels = chainon (named_labels, level->names);
1356 shadowed_labels = level->shadowed;
1358 /* Pop the current level, and free the structure for reuse. */
1359 label_level_chain = label_level_chain->level_chain;
1360 level->level_chain = free_binding_level;
1361 free_binding_level = level;
1364 /* Push a definition or a declaration of struct, union or enum tag "name".
1365 "type" should be the type node.
1366 We assume that the tag "name" is not already defined.
1368 Note that the definition may really be just a forward reference.
1369 In that case, the TYPE_SIZE will be zero. */
1372 pushtag (name, type)
1375 register struct binding_level *b;
1377 /* Find the proper binding level for this type tag. */
1379 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1384 /* Record the identifier as the type's name if it has none. */
1386 if (TYPE_NAME (type) == 0)
1387 TYPE_NAME (type) = name;
1390 if (b == global_binding_level)
1391 b->tags = perm_tree_cons (name, type, b->tags);
1393 b->tags = saveable_tree_cons (name, type, b->tags);
1395 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1396 tagged type we just added to the current binding level. This fake
1397 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1398 to output a representation of a tagged type, and it also gives
1399 us a convenient place to record the "scope start" address for the
1402 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1404 /* An approximation for now, so we can tell this is a function-scope tag.
1405 This will be updated in poplevel. */
1406 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1409 /* Handle when a new declaration NEWDECL
1410 has the same name as an old one OLDDECL
1411 in the same binding contour.
1412 Prints an error message if appropriate.
1414 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1415 Otherwise, return 0.
1417 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1418 and OLDDECL is in an outer binding level and should thus not be changed. */
1421 duplicate_decls (newdecl, olddecl, different_binding_level)
1422 register tree newdecl, olddecl;
1423 int different_binding_level;
1425 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1426 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_INITIAL (newdecl) != 0);
1428 tree oldtype = TREE_TYPE (olddecl);
1429 tree newtype = TREE_TYPE (newdecl);
1432 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1433 DECL_MACHINE_ATTRIBUTES (newdecl)
1434 = merge_machine_decl_attributes (olddecl, newdecl);
1436 if (TREE_CODE (newtype) == ERROR_MARK
1437 || TREE_CODE (oldtype) == ERROR_MARK)
1440 /* New decl is completely inconsistent with the old one =>
1441 tell caller to replace the old one.
1442 This is always an error except in the case of shadowing a builtin. */
1443 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1445 if (TREE_CODE (olddecl) == FUNCTION_DECL
1446 && (DECL_BUILT_IN (olddecl)
1447 || DECL_BUILT_IN_NONANSI (olddecl)))
1449 /* If you declare a built-in or predefined function name as static,
1450 the old definition is overridden,
1451 but optionally warn this was a bad choice of name. */
1452 if (!TREE_PUBLIC (newdecl))
1456 else if (DECL_BUILT_IN (olddecl))
1457 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1459 warning_with_decl (newdecl, "shadowing library function `%s'");
1461 /* Likewise, if the built-in is not ansi, then programs can
1462 override it even globally without an error. */
1463 else if (! DECL_BUILT_IN (olddecl))
1464 warning_with_decl (newdecl,
1465 "library function `%s' declared as non-function");
1467 else if (DECL_BUILT_IN_NONANSI (olddecl))
1468 warning_with_decl (newdecl,
1469 "built-in function `%s' declared as non-function");
1471 warning_with_decl (newdecl,
1472 "built-in function `%s' declared as non-function");
1476 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1477 error_with_decl (olddecl, "previous declaration of `%s'");
1483 /* For real parm decl following a forward decl,
1484 return 1 so old decl will be reused. */
1485 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1486 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1489 /* The new declaration is the same kind of object as the old one.
1490 The declarations may partially match. Print warnings if they don't
1491 match enough. Ultimately, copy most of the information from the new
1492 decl to the old one, and keep using the old one. */
1494 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1495 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1496 && DECL_INITIAL (olddecl) == 0)
1497 /* If -traditional, avoid error for redeclaring fcn
1498 after implicit decl. */
1500 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1501 && DECL_BUILT_IN (olddecl))
1503 /* A function declaration for a built-in function. */
1504 if (!TREE_PUBLIC (newdecl))
1506 /* If you declare a built-in function name as static, the
1507 built-in definition is overridden,
1508 but optionally warn this was a bad choice of name. */
1510 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1511 /* Discard the old built-in function. */
1514 else if (!types_match)
1516 /* Accept the return type of the new declaration if same modes. */
1517 tree oldreturntype = TREE_TYPE (oldtype);
1518 tree newreturntype = TREE_TYPE (newtype);
1520 /* Make sure we put the new type in the same obstack as the old ones.
1521 If the old types are not both in the same obstack, use the
1523 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1524 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1527 push_obstacks_nochange ();
1528 end_temporary_allocation ();
1531 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1533 /* Function types may be shared, so we can't just modify
1534 the return type of olddecl's function type. */
1536 = build_function_type (newreturntype,
1537 TYPE_ARG_TYPES (oldtype));
1539 types_match = comptypes (newtype, trytype);
1543 /* Accept harmless mismatch in first argument type also.
1545 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1546 && TYPE_ARG_TYPES (oldtype) != 0
1547 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1548 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1549 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1550 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1552 /* Function types may be shared, so we can't just modify
1553 the return type of olddecl's function type. */
1555 = build_function_type (TREE_TYPE (oldtype),
1556 tree_cons (NULL_TREE,
1557 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1558 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1560 types_match = comptypes (newtype, trytype);
1564 if (! different_binding_level)
1565 TREE_TYPE (olddecl) = oldtype;
1571 /* If types don't match for a built-in, throw away the built-in. */
1572 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1576 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1577 && DECL_SOURCE_LINE (olddecl) == 0)
1579 /* A function declaration for a predeclared function
1580 that isn't actually built in. */
1581 if (!TREE_PUBLIC (newdecl))
1583 /* If you declare it as static, the
1584 default definition is overridden. */
1587 else if (!types_match)
1589 /* If the types don't match, preserve volatility indication.
1590 Later on, we will discard everything else about the
1591 default declaration. */
1592 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1595 /* Permit char *foo () to match void *foo (...) if not pedantic,
1596 if one of them came from a system header file. */
1597 else if (!types_match
1598 && TREE_CODE (olddecl) == FUNCTION_DECL
1599 && TREE_CODE (newdecl) == FUNCTION_DECL
1600 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1601 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1602 && (DECL_IN_SYSTEM_HEADER (olddecl)
1603 || DECL_IN_SYSTEM_HEADER (newdecl))
1604 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1605 && TYPE_ARG_TYPES (oldtype) == 0
1606 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1607 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1609 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1610 && TYPE_ARG_TYPES (newtype) == 0
1611 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1612 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1615 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1616 /* Make sure we keep void * as ret type, not char *. */
1617 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1618 TREE_TYPE (newdecl) = newtype = oldtype;
1620 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1621 we will come back here again. */
1622 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1624 else if (!types_match
1625 /* Permit char *foo (int, ...); followed by char *foo ();
1627 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1629 /* Return types must still match. */
1630 && comptypes (TREE_TYPE (oldtype),
1631 TREE_TYPE (newtype))
1632 && TYPE_ARG_TYPES (newtype) == 0))
1634 error_with_decl (newdecl, "conflicting types for `%s'");
1635 /* Check for function type mismatch
1636 involving an empty arglist vs a nonempty one. */
1637 if (TREE_CODE (olddecl) == FUNCTION_DECL
1638 && comptypes (TREE_TYPE (oldtype),
1639 TREE_TYPE (newtype))
1640 && ((TYPE_ARG_TYPES (oldtype) == 0
1641 && DECL_INITIAL (olddecl) == 0)
1643 (TYPE_ARG_TYPES (newtype) == 0
1644 && DECL_INITIAL (newdecl) == 0)))
1646 /* Classify the problem further. */
1647 register tree t = TYPE_ARG_TYPES (oldtype);
1649 t = TYPE_ARG_TYPES (newtype);
1650 for (; t; t = TREE_CHAIN (t))
1652 register tree type = TREE_VALUE (t);
1654 if (TREE_CHAIN (t) == 0
1655 && TYPE_MAIN_VARIANT (type) != void_type_node)
1657 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1661 if (TYPE_MAIN_VARIANT (type) == float_type_node
1662 || C_PROMOTING_INTEGER_TYPE_P (type))
1664 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1669 error_with_decl (olddecl, "previous declaration of `%s'");
1673 errmsg = redeclaration_error_message (newdecl, olddecl);
1679 error_with_decl (newdecl, "redefinition of `%s'");
1682 error_with_decl (newdecl, "redeclaration of `%s'");
1685 error_with_decl (newdecl, "conflicting declarations of `%s'");
1691 error_with_decl (olddecl,
1692 ((DECL_INITIAL (olddecl)
1693 && current_binding_level == global_binding_level)
1694 ? "`%s' previously defined here"
1695 : "`%s' previously declared here"));
1697 else if (TREE_CODE (newdecl) == TYPE_DECL
1698 && (DECL_IN_SYSTEM_HEADER (olddecl)
1699 || DECL_IN_SYSTEM_HEADER (newdecl)))
1701 warning_with_decl (newdecl, "redefinition of `%s'");
1704 ((DECL_INITIAL (olddecl)
1705 && current_binding_level == global_binding_level)
1706 ? "`%s' previously defined here"
1707 : "`%s' previously declared here"));
1709 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1710 && DECL_INITIAL (olddecl) != 0
1711 && TYPE_ARG_TYPES (oldtype) == 0
1712 && TYPE_ARG_TYPES (newtype) != 0
1713 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1715 register tree type, parm;
1717 /* Prototype decl follows defn w/o prototype. */
1719 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1720 type = TYPE_ARG_TYPES (newtype),
1723 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1725 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1726 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1728 warning_with_decl (newdecl, "prototype for `%s' follows");
1729 warning_with_decl (olddecl, "non-prototype definition here");
1732 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1733 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1735 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1736 error_with_decl (olddecl, "non-prototype definition here");
1740 /* Type for passing arg must be consistent
1741 with that declared for the arg. */
1742 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1743 /* If -traditional, allow `unsigned int' instead of `int'
1744 in the prototype. */
1745 && (! (flag_traditional
1746 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1747 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1749 error_with_decl (newdecl,
1750 "prototype for `%s' follows and argument %d doesn't match",
1752 error_with_decl (olddecl, "non-prototype definition here");
1758 /* Warn about mismatches in various flags. */
1761 /* Warn if function is now inline
1762 but was previously declared not inline and has been called. */
1763 if (TREE_CODE (olddecl) == FUNCTION_DECL
1764 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1765 && TREE_USED (olddecl))
1766 warning_with_decl (newdecl,
1767 "`%s' declared inline after being called");
1768 if (TREE_CODE (olddecl) == FUNCTION_DECL
1769 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1770 && DECL_INITIAL (olddecl) != 0)
1771 warning_with_decl (newdecl,
1772 "`%s' declared inline after its definition");
1774 /* If pedantic, warn when static declaration follows a non-static
1775 declaration. Otherwise, do so only for functions. */
1776 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1777 && TREE_PUBLIC (olddecl)
1778 && !TREE_PUBLIC (newdecl))
1779 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1781 /* If warn_traditional, warn when a non-static function
1782 declaration follows a static one. */
1783 if (warn_traditional
1784 && TREE_CODE (olddecl) == FUNCTION_DECL
1785 && !TREE_PUBLIC (olddecl)
1786 && TREE_PUBLIC (newdecl))
1787 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1789 /* Warn when const declaration follows a non-const
1790 declaration, but not for functions. */
1791 if (TREE_CODE (olddecl) != FUNCTION_DECL
1792 && !TREE_READONLY (olddecl)
1793 && TREE_READONLY (newdecl))
1794 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1795 /* These bits are logically part of the type, for variables.
1796 But not for functions
1797 (where qualifiers are not valid ANSI anyway). */
1798 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1799 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1800 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1801 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1805 /* Optionally warn about more than one declaration for the same name. */
1806 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1807 /* Don't warn about a function declaration
1808 followed by a definition. */
1809 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1810 && DECL_INITIAL (olddecl) == 0)
1811 /* Don't warn about extern decl followed by (tentative) definition. */
1812 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1814 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1815 warning_with_decl (olddecl, "previous declaration of `%s'");
1818 /* Copy all the DECL_... slots specified in the new decl
1819 except for any that we copy here from the old type.
1821 Past this point, we don't change OLDTYPE and NEWTYPE
1822 even if we change the types of NEWDECL and OLDDECL. */
1826 /* When copying info to olddecl, we store into write_olddecl
1827 instead. This allows us to avoid modifying olddecl when
1828 different_binding_level is true. */
1829 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1831 /* Make sure we put the new type in the same obstack as the old ones.
1832 If the old types are not both in the same obstack, use the permanent
1834 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1835 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1838 push_obstacks_nochange ();
1839 end_temporary_allocation ();
1842 /* Merge the data types specified in the two decls. */
1843 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1845 if (different_binding_level)
1847 = build_type_attribute_variant
1849 merge_attributes (TYPE_ATTRIBUTES (newtype),
1850 TYPE_ATTRIBUTES (oldtype)));
1853 = TREE_TYPE (olddecl)
1854 = common_type (newtype, oldtype);
1857 /* Lay the type out, unless already done. */
1858 if (oldtype != TREE_TYPE (newdecl))
1860 if (TREE_TYPE (newdecl) != error_mark_node)
1861 layout_type (TREE_TYPE (newdecl));
1862 if (TREE_CODE (newdecl) != FUNCTION_DECL
1863 && TREE_CODE (newdecl) != TYPE_DECL
1864 && TREE_CODE (newdecl) != CONST_DECL)
1865 layout_decl (newdecl, 0);
1869 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1870 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1871 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1872 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1873 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1876 /* Keep the old rtl since we can safely use it. */
1877 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1879 /* Merge the type qualifiers. */
1880 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1881 && !TREE_THIS_VOLATILE (newdecl))
1882 TREE_THIS_VOLATILE (write_olddecl) = 0;
1883 if (TREE_READONLY (newdecl))
1884 TREE_READONLY (write_olddecl) = 1;
1885 if (TREE_THIS_VOLATILE (newdecl))
1887 TREE_THIS_VOLATILE (write_olddecl) = 1;
1888 if (TREE_CODE (newdecl) == VAR_DECL)
1889 make_var_volatile (newdecl);
1892 /* Keep source location of definition rather than declaration. */
1893 /* When called with different_binding_level set, keep the old
1894 information so that meaningful diagnostics can be given. */
1895 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1896 && ! different_binding_level)
1898 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1899 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1902 /* Merge the unused-warning information. */
1903 if (DECL_IN_SYSTEM_HEADER (olddecl))
1904 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1905 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1906 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1908 /* Merge the initialization information. */
1909 /* When called with different_binding_level set, don't copy over
1910 DECL_INITIAL, so that we don't accidentally change function
1911 declarations into function definitions. */
1912 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1913 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1915 /* Merge the section attribute.
1916 We want to issue an error if the sections conflict but that must be
1917 done later in decl_attributes since we are called before attributes
1919 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1920 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1922 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1924 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1925 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1927 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1928 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1929 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1930 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1937 else if (! different_binding_level)
1939 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1940 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1941 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1942 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1945 /* Merge the storage class information. */
1946 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1947 /* For functions, static overrides non-static. */
1948 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1950 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1951 /* This is since we don't automatically
1952 copy the attributes of NEWDECL into OLDDECL. */
1953 /* No need to worry about different_binding_level here because
1954 then TREE_PUBLIC (newdecl) was true. */
1955 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1956 /* If this clears `static', clear it in the identifier too. */
1957 if (! TREE_PUBLIC (olddecl))
1958 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1960 if (DECL_EXTERNAL (newdecl))
1962 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1963 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1964 /* An extern decl does not override previous storage class. */
1965 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1966 if (! DECL_EXTERNAL (newdecl))
1967 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1971 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1972 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1975 /* If either decl says `inline', this fn is inline,
1976 unless its definition was passed already. */
1977 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1978 DECL_INLINE (olddecl) = 1;
1979 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1981 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1983 if (DECL_BUILT_IN (olddecl))
1985 /* Get rid of any built-in function if new arg types don't match it
1986 or if we have a function definition. */
1987 if (! types_match || new_is_definition)
1989 if (! different_binding_level)
1991 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1992 DECL_BUILT_IN (olddecl) = 0;
1997 /* If redeclaring a builtin function, and not a definition,
1998 it stays built in. */
1999 DECL_BUILT_IN (newdecl) = 1;
2000 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2003 /* Also preserve various other info from the definition. */
2004 else if (! new_is_definition)
2005 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2006 if (! new_is_definition)
2008 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2009 /* When called with different_binding_level set, don't copy over
2010 DECL_INITIAL, so that we don't accidentally change function
2011 declarations into function definitions. */
2012 if (! different_binding_level)
2013 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2014 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2015 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2016 if (DECL_INLINE (newdecl))
2017 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2020 if (different_binding_level)
2022 /* Don't output a duplicate symbol or debugging information for this
2025 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2026 just have two declarations without a definition. VAR_DECLs may need
2027 the same treatment, I'm not sure. */
2028 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2029 DECL_IGNORED_P (newdecl) = 1;
2031 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2035 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2036 But preserve OLDDECL's DECL_UID. */
2038 register unsigned olddecl_uid = DECL_UID (olddecl);
2040 bcopy ((char *) newdecl + sizeof (struct tree_common),
2041 (char *) olddecl + sizeof (struct tree_common),
2042 sizeof (struct tree_decl) - sizeof (struct tree_common));
2043 DECL_UID (olddecl) = olddecl_uid;
2046 /* NEWDECL contains the merged attribute lists.
2047 Update OLDDECL to be the same. */
2048 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2053 /* Record a decl-node X as belonging to the current lexical scope.
2054 Check for errors (such as an incompatible declaration for the same
2055 name already seen in the same scope).
2057 Returns either X or an old decl for the same name.
2058 If an old decl is returned, it may have been smashed
2059 to agree with what X says. */
2066 register tree name = DECL_NAME (x);
2067 register struct binding_level *b = current_binding_level;
2069 DECL_CONTEXT (x) = current_function_decl;
2070 /* A local extern declaration for a function doesn't constitute nesting.
2071 A local auto declaration does, since it's a forward decl
2072 for a nested function coming later. */
2073 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2074 && DECL_EXTERNAL (x))
2075 DECL_CONTEXT (x) = 0;
2077 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2078 && x != IDENTIFIER_IMPLICIT_DECL (name)
2079 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2080 && !DECL_IN_SYSTEM_HEADER (x))
2081 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2087 int different_binding_level = 0;
2089 t = lookup_name_current_level (name);
2090 /* Don't type check externs here when -traditional. This is so that
2091 code with conflicting declarations inside blocks will get warnings
2092 not errors. X11 for instance depends on this. */
2093 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2095 t = IDENTIFIER_GLOBAL_VALUE (name);
2096 /* Type decls at global scope don't conflict with externs declared
2097 inside lexical blocks. */
2098 if (t && TREE_CODE (t) == TYPE_DECL)
2100 different_binding_level = 1;
2102 if (t != 0 && t == error_mark_node)
2103 /* error_mark_node is 0 for a while during initialization! */
2106 error_with_decl (x, "`%s' used prior to declaration");
2111 file = DECL_SOURCE_FILE (t);
2112 line = DECL_SOURCE_LINE (t);
2115 /* If this decl is `static' and an implicit decl was seen previously,
2116 warn. But don't complain if -traditional,
2117 since traditional compilers don't complain. */
2118 if (! flag_traditional && TREE_PUBLIC (name)
2119 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2120 sets this for all functions. */
2121 && ! TREE_PUBLIC (x)
2122 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2123 /* We used to warn also for explicit extern followed by static,
2124 but sometimes you need to do it that way. */
2125 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2127 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2128 IDENTIFIER_POINTER (name));
2129 pedwarn_with_file_and_line
2130 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2131 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2132 "previous declaration of `%s'",
2133 IDENTIFIER_POINTER (name));
2134 TREE_THIS_VOLATILE (name) = 1;
2137 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2139 if (TREE_CODE (t) == PARM_DECL)
2141 /* Don't allow more than one "real" duplicate
2142 of a forward parm decl. */
2143 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2149 /* If we are processing a typedef statement, generate a whole new
2150 ..._TYPE node (which will be just an variant of the existing
2151 ..._TYPE node with identical properties) and then install the
2152 TYPE_DECL node generated to represent the typedef name as the
2153 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2155 The whole point here is to end up with a situation where each
2156 and every ..._TYPE node the compiler creates will be uniquely
2157 associated with AT MOST one node representing a typedef name.
2158 This way, even though the compiler substitutes corresponding
2159 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2160 early on, later parts of the compiler can always do the reverse
2161 translation and get back the corresponding typedef name. For
2164 typedef struct S MY_TYPE;
2167 Later parts of the compiler might only know that `object' was of
2168 type `struct S' if it were not for code just below. With this
2169 code however, later parts of the compiler see something like:
2171 struct S' == struct S
2172 typedef struct S' MY_TYPE;
2175 And they can then deduce (from the node for type struct S') that
2176 the original object declaration was:
2180 Being able to do this is important for proper support of protoize,
2181 and also for generating precise symbolic debugging information
2182 which takes full account of the programmer's (typedef) vocabulary.
2184 Obviously, we don't want to generate a duplicate ..._TYPE node if
2185 the TYPE_DECL node that we are now processing really represents a
2186 standard built-in type.
2188 Since all standard types are effectively declared at line zero
2189 in the source file, we can easily check to see if we are working
2190 on a standard type by checking the current value of lineno. */
2192 if (TREE_CODE (x) == TYPE_DECL)
2194 if (DECL_SOURCE_LINE (x) == 0)
2196 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2197 TYPE_NAME (TREE_TYPE (x)) = x;
2199 else if (TREE_TYPE (x) != error_mark_node
2200 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2202 tree tt = TREE_TYPE (x);
2203 DECL_ORIGINAL_TYPE (x) = tt;
2204 tt = build_type_copy (tt);
2210 /* Multiple external decls of the same identifier ought to match.
2211 Check against both global declarations (when traditional) and out of
2212 scope (limbo) block level declarations.
2214 We get warnings about inline functions where they are defined.
2215 Avoid duplicate warnings where they are used. */
2216 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2220 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2221 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2222 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2223 decl = IDENTIFIER_GLOBAL_VALUE (name);
2224 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2225 /* Decls in limbo are always extern, so no need to check that. */
2226 decl = IDENTIFIER_LIMBO_VALUE (name);
2230 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2231 /* If old decl is built-in, we already warned if we should. */
2232 && !DECL_BUILT_IN (decl))
2234 pedwarn_with_decl (x,
2235 "type mismatch with previous external decl");
2236 pedwarn_with_decl (decl, "previous external decl of `%s'");
2240 /* If a function has had an implicit declaration, and then is defined,
2241 make sure they are compatible. */
2243 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2244 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2245 && TREE_CODE (x) == FUNCTION_DECL
2246 && ! comptypes (TREE_TYPE (x),
2247 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2249 warning_with_decl (x, "type mismatch with previous implicit declaration");
2250 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2251 "previous implicit declaration of `%s'");
2254 /* In PCC-compatibility mode, extern decls of vars with no current decl
2255 take effect at top level no matter where they are. */
2256 if (flag_traditional && DECL_EXTERNAL (x)
2257 && lookup_name (name) == 0)
2259 tree type = TREE_TYPE (x);
2261 /* But don't do this if the type contains temporary nodes. */
2264 if (type == error_mark_node)
2266 if (! TREE_PERMANENT (type))
2268 warning_with_decl (x, "type of external `%s' is not global");
2269 /* By exiting the loop early, we leave TYPE nonzero,
2270 and thus prevent globalization of the decl. */
2273 else if (TREE_CODE (type) == FUNCTION_TYPE
2274 && TYPE_ARG_TYPES (type) != 0)
2275 /* The types might not be truly local,
2276 but the list of arg types certainly is temporary.
2277 Since prototypes are nontraditional,
2278 ok not to do the traditional thing. */
2280 type = TREE_TYPE (type);
2284 b = global_binding_level;
2287 /* This name is new in its binding level.
2288 Install the new declaration and return it. */
2289 if (b == global_binding_level)
2291 /* Install a global value. */
2293 /* If the first global decl has external linkage,
2294 warn if we later see static one. */
2295 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2296 TREE_PUBLIC (name) = 1;
2298 IDENTIFIER_GLOBAL_VALUE (name) = x;
2300 /* We no longer care about any previous block level declarations. */
2301 IDENTIFIER_LIMBO_VALUE (name) = 0;
2303 /* Don't forget if the function was used via an implicit decl. */
2304 if (IDENTIFIER_IMPLICIT_DECL (name)
2305 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2306 TREE_USED (x) = 1, TREE_USED (name) = 1;
2308 /* Don't forget if its address was taken in that way. */
2309 if (IDENTIFIER_IMPLICIT_DECL (name)
2310 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2311 TREE_ADDRESSABLE (x) = 1;
2313 /* Warn about mismatches against previous implicit decl. */
2314 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2315 /* If this real decl matches the implicit, don't complain. */
2316 && ! (TREE_CODE (x) == FUNCTION_DECL
2317 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2318 == integer_type_node)))
2319 pedwarn ("`%s' was previously implicitly declared to return `int'",
2320 IDENTIFIER_POINTER (name));
2322 /* If this decl is `static' and an `extern' was seen previously,
2323 that is erroneous. */
2324 if (TREE_PUBLIC (name)
2325 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2327 /* Okay to redeclare an ANSI built-in as static. */
2328 if (t != 0 && DECL_BUILT_IN (t))
2330 /* Okay to declare a non-ANSI built-in as anything. */
2331 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2333 /* Okay to have global type decl after an earlier extern
2334 declaration inside a lexical block. */
2335 else if (TREE_CODE (x) == TYPE_DECL)
2337 else if (IDENTIFIER_IMPLICIT_DECL (name))
2339 if (! TREE_THIS_VOLATILE (name))
2340 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2341 IDENTIFIER_POINTER (name));
2344 pedwarn ("`%s' was declared `extern' and later `static'",
2345 IDENTIFIER_POINTER (name));
2350 /* Here to install a non-global value. */
2351 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2352 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2353 IDENTIFIER_LOCAL_VALUE (name) = x;
2355 /* If this is an extern function declaration, see if we
2356 have a global definition or declaration for the function. */
2358 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2360 && TREE_CODE (x) == FUNCTION_DECL
2361 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2363 /* We have one. Their types must agree. */
2364 if (! comptypes (TREE_TYPE (x),
2365 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2366 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2369 /* Inner extern decl is inline if global one is.
2370 Copy enough to really inline it. */
2371 if (DECL_INLINE (oldglobal))
2373 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2374 DECL_INITIAL (x) = (current_function_decl == oldglobal
2375 ? 0 : DECL_INITIAL (oldglobal));
2376 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2377 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2378 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2379 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2380 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2381 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2383 /* Inner extern decl is built-in if global one is. */
2384 if (DECL_BUILT_IN (oldglobal))
2386 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2387 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2389 /* Keep the arg types from a file-scope fcn defn. */
2390 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2391 && DECL_INITIAL (oldglobal)
2392 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2393 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2397 #if 0 /* This case is probably sometimes the right thing to do. */
2398 /* If we have a local external declaration,
2399 then any file-scope declaration should not
2400 have been static. */
2401 if (oldlocal == 0 && oldglobal != 0
2402 && !TREE_PUBLIC (oldglobal)
2403 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2404 warning ("`%s' locally external but globally static",
2405 IDENTIFIER_POINTER (name));
2408 /* If we have a local external declaration,
2409 and no file-scope declaration has yet been seen,
2410 then if we later have a file-scope decl it must not be static. */
2412 && DECL_EXTERNAL (x)
2416 TREE_PUBLIC (name) = 1;
2418 /* Save this decl, so that we can do type checking against
2419 other decls after it falls out of scope.
2421 Only save it once. This prevents temporary decls created in
2422 expand_inline_function from being used here, since this
2423 will have been set when the inline function was parsed.
2424 It also helps give slightly better warnings. */
2425 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2426 IDENTIFIER_LIMBO_VALUE (name) = x;
2429 /* Warn if shadowing an argument at the top level of the body. */
2430 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2431 /* This warning doesn't apply to the parms of a nested fcn. */
2432 && ! current_binding_level->parm_flag
2433 /* Check that this is one level down from the parms. */
2434 && current_binding_level->level_chain->parm_flag
2435 /* Check that the decl being shadowed
2436 comes from the parm level, one level up. */
2437 && chain_member (oldlocal, current_binding_level->level_chain->names))
2439 if (TREE_CODE (oldlocal) == PARM_DECL)
2440 pedwarn ("declaration of `%s' shadows a parameter",
2441 IDENTIFIER_POINTER (name));
2443 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2444 IDENTIFIER_POINTER (name));
2447 /* Maybe warn if shadowing something else. */
2448 else if (warn_shadow && !DECL_EXTERNAL (x)
2449 /* No shadow warnings for internally generated vars. */
2450 && DECL_SOURCE_LINE (x) != 0
2451 /* No shadow warnings for vars made for inlining. */
2452 && ! DECL_FROM_INLINE (x))
2454 char *id = IDENTIFIER_POINTER (name);
2456 if (TREE_CODE (x) == PARM_DECL
2457 && current_binding_level->level_chain->parm_flag)
2458 /* Don't warn about the parm names in function declarator
2459 within a function declarator.
2460 It would be nice to avoid warning in any function
2461 declarator in a declaration, as opposed to a definition,
2462 but there is no way to tell it's not a definition. */
2464 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2465 warning ("declaration of `%s' shadows a parameter", id);
2466 else if (oldlocal != 0)
2467 warning ("declaration of `%s' shadows previous local", id);
2468 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2469 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2470 warning ("declaration of `%s' shadows global declaration", id);
2473 /* If storing a local value, there may already be one (inherited).
2474 If so, record it for restoration when this binding level ends. */
2476 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2479 /* Keep count of variables in this level with incomplete type. */
2480 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2484 /* Put decls on list in reverse order.
2485 We will reverse them later if necessary. */
2486 TREE_CHAIN (x) = b->names;
2492 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2495 pushdecl_top_level (x)
2499 register struct binding_level *b = current_binding_level;
2501 current_binding_level = global_binding_level;
2503 current_binding_level = b;
2507 /* Generate an implicit declaration for identifier FUNCTIONID
2508 as a function of type int (). Print a warning if appropriate. */
2511 implicitly_declare (functionid)
2515 int traditional_warning = 0;
2516 /* Only one "implicit declaration" warning per identifier. */
2517 int implicit_warning;
2519 /* Save the decl permanently so we can warn if definition follows. */
2520 push_obstacks_nochange ();
2521 end_temporary_allocation ();
2523 /* We used to reuse an old implicit decl here,
2524 but this loses with inline functions because it can clobber
2525 the saved decl chains. */
2526 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2527 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2529 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2531 /* Warn of implicit decl following explicit local extern decl.
2532 This is probably a program designed for traditional C. */
2533 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2534 traditional_warning = 1;
2536 /* Warn once of an implicit declaration. */
2537 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2539 DECL_EXTERNAL (decl) = 1;
2540 TREE_PUBLIC (decl) = 1;
2542 /* Record that we have an implicit decl and this is it. */
2543 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2545 /* ANSI standard says implicit declarations are in the innermost block.
2546 So we record the decl in the standard fashion.
2547 If flag_traditional is set, pushdecl does it top-level. */
2550 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2551 maybe_objc_check_decl (decl);
2553 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2555 if (mesg_implicit_function_declaration && implicit_warning)
2557 if (mesg_implicit_function_declaration == 2)
2558 error ("implicit declaration of function `%s'",
2559 IDENTIFIER_POINTER (functionid));
2561 warning ("implicit declaration of function `%s'",
2562 IDENTIFIER_POINTER (functionid));
2564 else if (warn_traditional && traditional_warning)
2565 warning ("function `%s' was previously declared within a block",
2566 IDENTIFIER_POINTER (functionid));
2568 /* Write a record describing this implicit function declaration to the
2569 prototypes file (if requested). */
2571 gen_aux_info_record (decl, 0, 1, 0);
2578 /* Return zero if the declaration NEWDECL is valid
2579 when the declaration OLDDECL (assumed to be for the same name)
2580 has already been seen.
2581 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2582 and 3 if it is a conflicting declaration. */
2585 redeclaration_error_message (newdecl, olddecl)
2586 tree newdecl, olddecl;
2588 if (TREE_CODE (newdecl) == TYPE_DECL)
2590 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2592 /* pushdecl creates distinct types for TYPE_DECLs by calling
2593 build_type_copy, so the above comparison generally fails. We do
2594 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2595 is equivalent to what this code used to do before the build_type_copy
2596 call. The variant type distinction should not matter for traditional
2597 code, because it doesn't have type qualifiers. */
2598 if (flag_traditional
2599 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2601 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2605 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2607 /* Declarations of functions can insist on internal linkage
2608 but they can't be inconsistent with internal linkage,
2609 so there can be no error on that account.
2610 However defining the same name twice is no good. */
2611 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2612 /* However, defining once as extern inline and a second
2613 time in another way is ok. */
2614 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2615 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2619 else if (current_binding_level == global_binding_level)
2621 /* Objects declared at top level: */
2622 /* If at least one is a reference, it's ok. */
2623 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2625 /* Reject two definitions. */
2626 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2628 /* Now we have two tentative defs, or one tentative and one real def. */
2629 /* Insist that the linkage match. */
2630 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2634 else if (current_binding_level->parm_flag
2635 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2639 /* Newdecl has block scope. If olddecl has block scope also, then
2640 reject two definitions, and reject a definition together with an
2641 external reference. Otherwise, it is OK, because newdecl must
2642 be an extern reference to olddecl. */
2643 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2644 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2650 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2651 Create one if none exists so far for the current function.
2652 This function is called for both label definitions and label references. */
2658 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2660 if (current_function_decl == 0)
2662 error ("label %s referenced outside of any function",
2663 IDENTIFIER_POINTER (id));
2667 /* Use a label already defined or ref'd with this name. */
2670 /* But not if it is inherited and wasn't declared to be inheritable. */
2671 if (DECL_CONTEXT (decl) != current_function_decl
2672 && ! C_DECLARED_LABEL_FLAG (decl))
2673 return shadow_label (id);
2677 decl = build_decl (LABEL_DECL, id, void_type_node);
2679 /* Make sure every label has an rtx. */
2682 /* A label not explicitly declared must be local to where it's ref'd. */
2683 DECL_CONTEXT (decl) = current_function_decl;
2685 DECL_MODE (decl) = VOIDmode;
2687 /* Say where one reference is to the label,
2688 for the sake of the error if it is not defined. */
2689 DECL_SOURCE_LINE (decl) = lineno;
2690 DECL_SOURCE_FILE (decl) = input_filename;
2692 IDENTIFIER_LABEL_VALUE (id) = decl;
2694 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2699 /* Make a label named NAME in the current function,
2700 shadowing silently any that may be inherited from containing functions
2701 or containing scopes.
2703 Note that valid use, if the label being shadowed
2704 comes from another scope in the same function,
2705 requires calling declare_nonlocal_label right away. */
2711 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2717 /* Check to make sure that the label hasn't already been declared
2718 at this label scope */
2719 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2720 if (TREE_VALUE (dup) == decl)
2722 error ("duplicate label declaration `%s'",
2723 IDENTIFIER_POINTER (name));
2724 error_with_decl (TREE_VALUE (dup),
2725 "this is a previous declaration");
2726 /* Just use the previous declaration. */
2727 return lookup_label (name);
2730 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2731 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2734 return lookup_label (name);
2737 /* Define a label, specifying the location in the source file.
2738 Return the LABEL_DECL node for the label, if the definition is valid.
2739 Otherwise return 0. */
2742 define_label (filename, line, name)
2747 tree decl = lookup_label (name);
2749 /* If label with this name is known from an outer context, shadow it. */
2750 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2752 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2753 IDENTIFIER_LABEL_VALUE (name) = 0;
2754 decl = lookup_label (name);
2757 if (DECL_INITIAL (decl) != 0)
2759 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2764 /* Mark label as having been defined. */
2765 DECL_INITIAL (decl) = error_mark_node;
2766 /* Say where in the source. */
2767 DECL_SOURCE_FILE (decl) = filename;
2768 DECL_SOURCE_LINE (decl) = line;
2773 /* Return the list of declarations of the current level.
2774 Note that this list is in reverse order unless/until
2775 you nreverse it; and when you do nreverse it, you must
2776 store the result back using `storedecls' or you will lose. */
2781 return current_binding_level->names;
2784 /* Return the list of type-tags (for structs, etc) of the current level. */
2789 return current_binding_level->tags;
2792 /* Store the list of declarations of the current level.
2793 This is done for the parameter declarations of a function being defined,
2794 after they are modified in the light of any missing parameters. */
2800 current_binding_level->names = decls;
2803 /* Similarly, store the list of tags of the current level. */
2809 current_binding_level->tags = tags;
2812 /* Given NAME, an IDENTIFIER_NODE,
2813 return the structure (or union or enum) definition for that name.
2814 Searches binding levels from BINDING_LEVEL up to the global level.
2815 If THISLEVEL_ONLY is nonzero, searches only the specified context
2816 (but skips any tag-transparent contexts to find one that is
2817 meaningful for tags).
2818 CODE says which kind of type the caller wants;
2819 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2820 If the wrong kind of type is found, an error is reported. */
2823 lookup_tag (code, name, binding_level, thislevel_only)
2824 enum tree_code code;
2825 struct binding_level *binding_level;
2829 register struct binding_level *level;
2831 for (level = binding_level; level; level = level->level_chain)
2834 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2836 if (TREE_PURPOSE (tail) == name)
2838 if (TREE_CODE (TREE_VALUE (tail)) != code)
2840 /* Definition isn't the kind we were looking for. */
2841 pending_invalid_xref = name;
2842 pending_invalid_xref_file = input_filename;
2843 pending_invalid_xref_line = lineno;
2845 return TREE_VALUE (tail);
2848 if (thislevel_only && ! level->tag_transparent)
2854 /* Print an error message now
2855 for a recent invalid struct, union or enum cross reference.
2856 We don't print them immediately because they are not invalid
2857 when used in the `struct foo;' construct for shadowing. */
2860 pending_xref_error ()
2862 if (pending_invalid_xref != 0)
2863 error_with_file_and_line (pending_invalid_xref_file,
2864 pending_invalid_xref_line,
2865 "`%s' defined as wrong kind of tag",
2866 IDENTIFIER_POINTER (pending_invalid_xref));
2867 pending_invalid_xref = 0;
2870 /* Given a type, find the tag that was defined for it and return the tag name.
2871 Otherwise return 0. */
2874 lookup_tag_reverse (type)
2877 register struct binding_level *level;
2879 for (level = current_binding_level; level; level = level->level_chain)
2882 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2884 if (TREE_VALUE (tail) == type)
2885 return TREE_PURPOSE (tail);
2891 /* Look up NAME in the current binding level and its superiors
2892 in the namespace of variables, functions and typedefs.
2893 Return a ..._DECL node of some kind representing its definition,
2894 or return 0 if it is undefined. */
2901 if (current_binding_level != global_binding_level
2902 && IDENTIFIER_LOCAL_VALUE (name))
2903 val = IDENTIFIER_LOCAL_VALUE (name);
2905 val = IDENTIFIER_GLOBAL_VALUE (name);
2909 /* Similar to `lookup_name' but look only at current binding level. */
2912 lookup_name_current_level (name)
2917 if (current_binding_level == global_binding_level)
2918 return IDENTIFIER_GLOBAL_VALUE (name);
2920 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2923 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2924 if (DECL_NAME (t) == name)
2930 /* Create the predefined scalar types of C,
2931 and some nodes representing standard constants (0, 1, (void *) 0).
2932 Initialize the global binding level.
2933 Make definitions for built-in primitive functions. */
2936 init_decl_processing ()
2938 register tree endlink;
2939 tree ptr_ftype_void, ptr_ftype_ptr;
2940 int wchar_type_size;
2941 tree array_domain_type;
2943 current_function_decl = NULL;
2944 named_labels = NULL;
2945 current_binding_level = NULL_BINDING_LEVEL;
2946 free_binding_level = NULL_BINDING_LEVEL;
2947 pushlevel (0); /* make the binding_level structure for global names */
2948 global_binding_level = current_binding_level;
2950 /* Define `int' and `char' first so that dbx will output them first. */
2952 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2953 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2954 integer_type_node));
2956 /* Define `char', which is like either `signed char' or `unsigned char'
2957 but not the same as either. */
2961 ? make_signed_type (CHAR_TYPE_SIZE)
2962 : make_unsigned_type (CHAR_TYPE_SIZE));
2963 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2966 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2967 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2968 long_integer_type_node));
2970 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2971 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2972 unsigned_type_node));
2974 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2975 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2976 long_unsigned_type_node));
2978 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2979 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2980 long_long_integer_type_node));
2982 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2983 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2984 long_long_unsigned_type_node));
2986 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2988 short_integer_type_node));
2990 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2992 short_unsigned_type_node));
2994 /* `unsigned long' is the standard type for sizeof.
2995 Traditionally, use a signed type.
2996 Note that stddef.h uses `unsigned long',
2997 and this must agree, even if long and int are the same size. */
2999 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3000 if (flag_traditional && TREE_UNSIGNED (sizetype))
3001 set_sizetype (signed_type (sizetype));
3004 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3006 error_mark_node = make_node (ERROR_MARK);
3007 TREE_TYPE (error_mark_node) = error_mark_node;
3009 /* Define both `signed char' and `unsigned char'. */
3010 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3012 signed_char_type_node));
3014 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3015 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3016 unsigned_char_type_node));
3018 /* Create the widest literal types. */
3019 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3020 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3021 widest_integer_literal_type_node));
3023 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3024 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3025 widest_unsigned_literal_type_node));
3027 /* Now all the integer mode types. */
3028 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3031 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3032 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3034 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3037 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3038 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3040 #if HOST_BITS_PER_WIDE_INT >= 64
3041 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3045 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3046 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3048 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3049 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3051 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3052 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3054 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3055 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3057 #if HOST_BITS_PER_WIDE_INT >= 64
3058 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3059 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3062 float_type_node = make_node (REAL_TYPE);
3063 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3064 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3066 layout_type (float_type_node);
3068 double_type_node = make_node (REAL_TYPE);
3069 if (flag_short_double)
3070 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3072 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3073 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3075 layout_type (double_type_node);
3077 long_double_type_node = make_node (REAL_TYPE);
3078 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3079 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3080 long_double_type_node));
3081 layout_type (long_double_type_node);
3083 complex_integer_type_node = make_node (COMPLEX_TYPE);
3084 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3085 complex_integer_type_node));
3086 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3087 layout_type (complex_integer_type_node);
3089 complex_float_type_node = make_node (COMPLEX_TYPE);
3090 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3091 complex_float_type_node));
3092 TREE_TYPE (complex_float_type_node) = float_type_node;
3093 layout_type (complex_float_type_node);
3095 complex_double_type_node = make_node (COMPLEX_TYPE);
3096 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3097 complex_double_type_node));
3098 TREE_TYPE (complex_double_type_node) = double_type_node;
3099 layout_type (complex_double_type_node);
3101 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3102 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3103 complex_long_double_type_node));
3104 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3105 layout_type (complex_long_double_type_node);
3108 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3109 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3110 signed_wchar_type_node = signed_type (wchar_type_node);
3111 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3113 integer_zero_node = build_int_2 (0, 0);
3114 TREE_TYPE (integer_zero_node) = integer_type_node;
3115 integer_one_node = build_int_2 (1, 0);
3116 TREE_TYPE (integer_one_node) = integer_type_node;
3118 boolean_type_node = integer_type_node;
3119 boolean_true_node = integer_one_node;
3120 boolean_false_node = integer_zero_node;
3122 size_zero_node = build_int_2 (0, 0);
3123 TREE_TYPE (size_zero_node) = sizetype;
3124 size_one_node = build_int_2 (1, 0);
3125 TREE_TYPE (size_one_node) = sizetype;
3127 void_type_node = make_node (VOID_TYPE);
3128 pushdecl (build_decl (TYPE_DECL,
3129 ridpointers[(int) RID_VOID], void_type_node));
3130 layout_type (void_type_node); /* Uses integer_zero_node */
3131 /* We are not going to have real types in C with less than byte alignment,
3132 so we might as well not have any types that claim to have it. */
3133 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3135 null_pointer_node = build_int_2 (0, 0);
3136 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3137 layout_type (TREE_TYPE (null_pointer_node));
3139 string_type_node = build_pointer_type (char_type_node);
3140 const_string_type_node
3141 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3143 /* Make a type to be the domain of a few array types
3144 whose domains don't really matter.
3145 200 is small enough that it always fits in size_t
3146 and large enough that it can hold most function names for the
3147 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3148 array_domain_type = build_index_type (build_int_2 (200, 0));
3150 /* make a type for arrays of characters.
3151 With luck nothing will ever really depend on the length of this
3153 char_array_type_node
3154 = build_array_type (char_type_node, array_domain_type);
3155 /* Likewise for arrays of ints. */
3157 = build_array_type (integer_type_node, array_domain_type);
3158 /* This is for wide string constants. */
3159 wchar_array_type_node
3160 = build_array_type (wchar_type_node, array_domain_type);
3162 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3164 default_function_type
3165 = build_function_type (integer_type_node, NULL_TREE);
3167 ptr_type_node = build_pointer_type (void_type_node);
3169 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3171 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3173 endlink = void_list_node;
3174 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3176 = build_function_type (ptr_type_node,
3177 tree_cons (NULL_TREE, ptr_type_node, endlink));
3179 builtin_function ("__builtin_aggregate_incoming_address",
3180 build_function_type (ptr_type_node, NULL_TREE),
3181 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3183 /* Hooks for the DWARF 2 __throw routine. */
3184 builtin_function ("__builtin_unwind_init",
3185 build_function_type (void_type_node, endlink),
3186 BUILT_IN_UNWIND_INIT, NULL_PTR);
3187 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3188 BUILT_IN_DWARF_CFA, NULL_PTR);
3189 builtin_function ("__builtin_dwarf_fp_regnum",
3190 build_function_type (unsigned_type_node, endlink),
3191 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3192 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3193 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3194 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3195 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3196 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3197 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3199 ("__builtin_eh_return",
3200 build_function_type (void_type_node,
3201 tree_cons (NULL_TREE, ptr_type_node,
3202 tree_cons (NULL_TREE,
3203 type_for_mode (ptr_mode, 0),
3204 tree_cons (NULL_TREE,
3207 BUILT_IN_EH_RETURN, NULL_PTR);
3209 pedantic_lvalues = pedantic;
3211 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3212 declare_function_name ();
3214 start_identifier_warnings ();
3216 /* Prepare to check format strings against argument lists. */
3217 init_function_format_info ();
3221 incomplete_decl_finalize_hook = finish_incomplete_decl;
3223 lang_get_alias_set = c_get_alias_set;
3226 /* Return a definition for a builtin function named NAME and whose data type
3227 is TYPE. TYPE should be a function type with argument types.
3228 FUNCTION_CODE tells later passes how to compile calls to this function.
3229 See tree.h for its possible values.
3231 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3232 the name to be called if we can't opencode the function. */
3235 builtin_function (name, type, function_code, library_name)
3238 enum built_in_function function_code;
3239 const char *library_name;
3241 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3242 DECL_EXTERNAL (decl) = 1;
3243 TREE_PUBLIC (decl) = 1;
3244 /* If -traditional, permit redefining a builtin function any way you like.
3245 (Though really, if the program redefines these functions,
3246 it probably won't work right unless compiled with -fno-builtin.) */
3247 if (flag_traditional && name[0] != '_')
3248 DECL_BUILT_IN_NONANSI (decl) = 1;
3250 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3251 make_decl_rtl (decl, NULL_PTR, 1);
3253 if (function_code != NOT_BUILT_IN)
3255 DECL_BUILT_IN (decl) = 1;
3256 DECL_FUNCTION_CODE (decl) = function_code;
3258 /* Warn if a function in the namespace for users
3259 is used without an occasion to consider it declared. */
3260 if (name[0] != '_' || name[1] != '_')
3261 C_DECL_ANTICIPATED (decl) = 1;
3266 /* Called when a declaration is seen that contains no names to declare.
3267 If its type is a reference to a structure, union or enum inherited
3268 from a containing scope, shadow that tag name for the current scope
3269 with a forward reference.
3270 If its type defines a new named structure or union
3271 or defines an enum, it is valid but we need not do anything here.
3272 Otherwise, it is an error. */
3275 shadow_tag (declspecs)
3278 shadow_tag_warned (declspecs, 0);
3282 shadow_tag_warned (declspecs, warned)
3285 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3292 pending_invalid_xref = 0;
3294 /* Remove the attributes from declspecs, since they will confuse the
3296 split_specs_attrs (declspecs, &specs, &attrs);
3298 for (link = specs; link; link = TREE_CHAIN (link))
3300 register tree value = TREE_VALUE (link);
3301 register enum tree_code code = TREE_CODE (value);
3303 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3304 /* Used to test also that TYPE_SIZE (value) != 0.
3305 That caused warning for `struct foo;' at top level in the file. */
3307 register tree name = lookup_tag_reverse (value);
3314 if (warned != 1 && code != ENUMERAL_TYPE)
3315 /* Empty unnamed enum OK */
3317 pedwarn ("unnamed struct/union that defines no instances");
3323 t = lookup_tag (code, name, current_binding_level, 1);
3327 t = make_node (code);
3334 if (!warned && ! in_system_header)
3336 warning ("useless keyword or type name in empty declaration");
3343 error ("two types specified in one empty declaration");
3348 pedwarn ("empty declaration");
3352 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3355 groktypename (typename)
3358 if (TREE_CODE (typename) != TREE_LIST)
3360 return grokdeclarator (TREE_VALUE (typename),
3361 TREE_PURPOSE (typename),
3365 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3368 groktypename_in_parm_context (typename)
3371 if (TREE_CODE (typename) != TREE_LIST)
3373 return grokdeclarator (TREE_VALUE (typename),
3374 TREE_PURPOSE (typename),
3378 /* Decode a declarator in an ordinary declaration or data definition.
3379 This is called as soon as the type information and variable name
3380 have been parsed, before parsing the initializer if any.
3381 Here we create the ..._DECL node, fill in its type,
3382 and put it on the list of decls for the current context.
3383 The ..._DECL node is returned as the value.
3385 Exception: for arrays where the length is not specified,
3386 the type is left null, to be filled in by `finish_decl'.
3388 Function definitions do not come here; they go to start_function
3389 instead. However, external and forward declarations of functions
3390 do go through here. Structure field declarations are done by
3391 grokfield and not through here. */
3393 /* Set this to zero to debug not using the temporary obstack
3394 to parse initializers. */
3395 int debug_temp_inits = 1;
3398 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3399 tree declarator, declspecs;
3401 tree attributes, prefix_attributes;
3403 register tree decl = grokdeclarator (declarator, declspecs,
3404 NORMAL, initialized);
3406 int init_written = initialized;
3408 /* The corresponding pop_obstacks is in finish_decl. */
3409 push_obstacks_nochange ();
3411 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3412 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3413 warning_with_decl (decl, "`%s' is usually a function");
3416 /* Is it valid for this decl to have an initializer at all?
3417 If not, set INITIALIZED to zero, which will indirectly
3418 tell `finish_decl' to ignore the initializer once it is parsed. */
3419 switch (TREE_CODE (decl))
3422 /* typedef foo = bar means give foo the same type as bar.
3423 We haven't parsed bar yet, so `finish_decl' will fix that up.
3424 Any other case of an initialization in a TYPE_DECL is an error. */
3425 if (pedantic || list_length (declspecs) > 1)
3427 error ("typedef `%s' is initialized",
3428 IDENTIFIER_POINTER (DECL_NAME (decl)));
3434 error ("function `%s' is initialized like a variable",
3435 IDENTIFIER_POINTER (DECL_NAME (decl)));
3440 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3441 error ("parameter `%s' is initialized",
3442 IDENTIFIER_POINTER (DECL_NAME (decl)));
3447 /* Don't allow initializations for incomplete types
3448 except for arrays which might be completed by the initialization. */
3449 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3451 /* A complete type is ok if size is fixed. */
3453 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3454 || C_DECL_VARIABLE_SIZE (decl))
3456 error ("variable-sized object may not be initialized");
3460 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3462 error ("variable `%s' has initializer but incomplete type",
3463 IDENTIFIER_POINTER (DECL_NAME (decl)));
3466 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3468 error ("elements of array `%s' have incomplete type",
3469 IDENTIFIER_POINTER (DECL_NAME (decl)));
3476 #if 0 /* Seems redundant with grokdeclarator. */
3477 if (current_binding_level != global_binding_level
3478 && DECL_EXTERNAL (decl)
3479 && TREE_CODE (decl) != FUNCTION_DECL)
3480 warning ("declaration of `%s' has `extern' and is initialized",
3481 IDENTIFIER_POINTER (DECL_NAME (decl)));
3483 DECL_EXTERNAL (decl) = 0;
3484 if (current_binding_level == global_binding_level)
3485 TREE_STATIC (decl) = 1;
3487 /* Tell `pushdecl' this is an initialized decl
3488 even though we don't yet have the initializer expression.
3489 Also tell `finish_decl' it may store the real initializer. */
3490 DECL_INITIAL (decl) = error_mark_node;
3493 /* If this is a function declaration, write a record describing it to the
3494 prototypes file (if requested). */
3496 if (TREE_CODE (decl) == FUNCTION_DECL)
3497 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3499 /* ANSI specifies that a tentative definition which is not merged with
3500 a non-tentative definition behaves exactly like a definition with an
3501 initializer equal to zero. (Section 3.7.2)
3502 -fno-common gives strict ANSI behavior. Usually you don't want it.
3503 This matters only for variables with external linkage. */
3504 if (! flag_no_common || ! TREE_PUBLIC (decl))
3505 DECL_COMMON (decl) = 1;
3507 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3508 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3511 /* Set attributes here so if duplicate decl, will have proper attributes. */
3512 decl_attributes (decl, attributes, prefix_attributes);
3514 /* Add this decl to the current binding level.
3515 TEM may equal DECL or it may be a previous decl of the same name. */
3516 tem = pushdecl (decl);
3518 /* For a local variable, define the RTL now. */
3519 if (current_binding_level != global_binding_level
3520 /* But not if this is a duplicate decl
3521 and we preserved the rtl from the previous one
3522 (which may or may not happen). */
3523 && DECL_RTL (tem) == 0)
3525 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3527 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3528 && DECL_INITIAL (tem) != 0)
3534 /* When parsing and digesting the initializer,
3535 use temporary storage. Do this even if we will ignore the value. */
3536 if (current_binding_level == global_binding_level && debug_temp_inits)
3537 temporary_allocation ();
3543 /* Finish processing of a declaration;
3544 install its initial value.
3545 If the length of an array type is not known before,
3546 it must be determined now, from the initial value, or it is an error. */
3549 finish_decl (decl, init, asmspec_tree)
3553 register tree type = TREE_TYPE (decl);
3554 int was_incomplete = (DECL_SIZE (decl) == 0);
3555 int temporary = allocation_temporary_p ();
3558 /* If a name was specified, get the string. */
3560 asmspec = TREE_STRING_POINTER (asmspec_tree);
3562 /* If `start_decl' didn't like having an initialization, ignore it now. */
3564 if (init != 0 && DECL_INITIAL (decl) == 0)
3566 /* Don't crash if parm is initialized. */
3567 if (TREE_CODE (decl) == PARM_DECL)
3570 if (ITERATOR_P (decl))
3573 error_with_decl (decl, "iterator has no initial value");
3575 init = save_expr (init);
3580 if (TREE_CODE (decl) != TYPE_DECL)
3581 store_init_value (decl, init);
3584 /* typedef foo = bar; store the type of bar as the type of foo. */
3585 TREE_TYPE (decl) = TREE_TYPE (init);
3586 DECL_INITIAL (decl) = init = 0;
3590 /* Pop back to the obstack that is current for this binding level.
3591 This is because MAXINDEX, rtl, etc. to be made below
3592 must go in the permanent obstack. But don't discard the
3593 temporary data yet. */
3595 #if 0 /* pop_obstacks was near the end; this is what was here. */
3596 if (current_binding_level == global_binding_level && temporary)
3597 end_temporary_allocation ();
3600 /* Deduce size of array from initialization, if not already known */
3602 if (TREE_CODE (type) == ARRAY_TYPE
3603 && TYPE_DOMAIN (type) == 0
3604 && TREE_CODE (decl) != TYPE_DECL)
3607 = (TREE_STATIC (decl)
3608 /* Even if pedantic, an external linkage array
3609 may have incomplete type at first. */
3610 ? pedantic && !TREE_PUBLIC (decl)
3611 : !DECL_EXTERNAL (decl));
3613 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3615 /* Get the completed type made by complete_array_type. */
3616 type = TREE_TYPE (decl);
3619 error_with_decl (decl, "initializer fails to determine size of `%s'");
3624 error_with_decl (decl, "array size missing in `%s'");
3625 /* If a `static' var's size isn't known,
3626 make it extern as well as static, so it does not get
3628 If it is not `static', then do not mark extern;
3629 finish_incomplete_decl will give it a default size
3630 and it will get allocated. */
3631 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3632 DECL_EXTERNAL (decl) = 1;
3635 /* TYPE_MAX_VALUE is always one less than the number of elements
3636 in the array, because we start counting at zero. Therefore,
3637 warn only if the value is less than zero. */
3638 if (pedantic && TYPE_DOMAIN (type) != 0
3639 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3640 error_with_decl (decl, "zero or negative size array `%s'");
3642 layout_decl (decl, 0);
3645 if (TREE_CODE (decl) == VAR_DECL)
3647 if (DECL_SIZE (decl) == 0
3648 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3649 layout_decl (decl, 0);
3651 if (DECL_SIZE (decl) == 0
3652 && (TREE_STATIC (decl)
3654 /* A static variable with an incomplete type
3655 is an error if it is initialized.
3656 Also if it is not file scope.
3657 Otherwise, let it through, but if it is not `extern'
3658 then it may cause an error message later. */
3659 /* A duplicate_decls call could have changed an extern
3660 declaration into a file scope one. This can be detected
3661 by TREE_ASM_WRITTEN being set. */
3662 (DECL_INITIAL (decl) != 0
3663 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3665 /* An automatic variable with an incomplete type
3667 !DECL_EXTERNAL (decl)))
3669 error_with_decl (decl, "storage size of `%s' isn't known");
3670 TREE_TYPE (decl) = error_mark_node;
3673 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3674 && DECL_SIZE (decl) != 0)
3676 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3677 constant_expression_warning (DECL_SIZE (decl));
3679 error_with_decl (decl, "storage size of `%s' isn't constant");
3682 if (TREE_USED (type))
3683 TREE_USED (decl) = 1;
3686 /* If this is a function and an assembler name is specified, it isn't
3687 builtin any more. Also reset DECL_RTL so we can give it its new
3689 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3691 DECL_BUILT_IN (decl) = 0;
3692 DECL_RTL (decl) = 0;
3695 /* Output the assembler code and/or RTL code for variables and functions,
3696 unless the type is an undefined structure or union.
3697 If not, it will get done when the type is completed. */
3699 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3701 if ((flag_traditional || TREE_PERMANENT (decl))
3702 && allocation_temporary_p ())
3704 push_obstacks_nochange ();
3705 end_temporary_allocation ();
3706 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3707 maybe_objc_check_decl (decl);
3708 rest_of_decl_compilation (decl, asmspec,
3709 (DECL_CONTEXT (decl) == 0
3710 || TREE_ASM_WRITTEN (decl)),
3716 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3717 maybe_objc_check_decl (decl);
3718 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3721 if (DECL_CONTEXT (decl) != 0)
3723 /* Recompute the RTL of a local array now
3724 if it used to be an incomplete type. */
3726 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3728 /* If we used it already as memory, it must stay in memory. */
3729 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3730 /* If it's still incomplete now, no init will save it. */
3731 if (DECL_SIZE (decl) == 0)
3732 DECL_INITIAL (decl) = 0;
3735 /* Compute and store the initial value. */
3736 if (TREE_CODE (decl) != FUNCTION_DECL)
3737 expand_decl_init (decl);
3741 if (TREE_CODE (decl) == TYPE_DECL)
3743 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3744 maybe_objc_check_decl (decl);
3745 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3749 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3750 /* This test used to include TREE_PERMANENT, however, we have the same
3751 problem with initializers at the function level. Such initializers get
3752 saved until the end of the function on the momentary_obstack. */
3753 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3755 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3756 space with DECL_ARG_TYPE. */
3757 && TREE_CODE (decl) != PARM_DECL)
3759 /* We need to remember that this array HAD an initialization,
3760 but discard the actual temporary nodes,
3761 since we can't have a permanent node keep pointing to them. */
3762 /* We make an exception for inline functions, since it's
3763 normal for a local extern redeclaration of an inline function
3764 to have a copy of the top-level decl's DECL_INLINE. */
3765 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3767 /* If this is a const variable, then preserve the
3768 initializer instead of discarding it so that we can optimize
3769 references to it. */
3770 /* This test used to include TREE_STATIC, but this won't be set
3771 for function level initializers. */
3772 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3774 preserve_initializer ();
3775 /* Hack? Set the permanent bit for something that is permanent,
3776 but not on the permanent obstack, so as to convince
3777 output_constant_def to make its rtl on the permanent
3779 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3781 /* The initializer and DECL must have the same (or equivalent
3782 types), but if the initializer is a STRING_CST, its type
3783 might not be on the right obstack, so copy the type
3785 TREE_TYPE (DECL_INITIAL (decl)) = type;
3788 DECL_INITIAL (decl) = error_mark_node;
3792 /* If requested, warn about definitions of large data objects. */
3794 if (warn_larger_than
3795 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3796 && !DECL_EXTERNAL (decl))
3798 register tree decl_size = DECL_SIZE (decl);
3800 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3802 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3804 if (units > larger_than_size)
3805 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3810 /* Resume permanent allocation, if not within a function. */
3811 /* The corresponding push_obstacks_nochange is in start_decl,
3812 and in push_parm_decl and in grokfield. */
3816 /* If we have gone back from temporary to permanent allocation,
3817 actually free the temporary space that we no longer need. */
3818 if (temporary && !allocation_temporary_p ())
3819 permanent_allocation (0);
3821 /* At the end of a declaration, throw away any variable type sizes
3822 of types defined inside that declaration. There is no use
3823 computing them in the following function definition. */
3824 if (current_binding_level == global_binding_level)
3825 get_pending_sizes ();
3828 /* If DECL has a cleanup, build and return that cleanup here.
3829 This is a callback called by expand_expr. */
3832 maybe_build_cleanup (decl)
3833 tree decl ATTRIBUTE_UNUSED;
3835 /* There are no cleanups in C. */
3839 /* Given a parsed parameter declaration,
3840 decode it into a PARM_DECL and push that on the current binding level.
3841 Also, for the sake of forward parm decls,
3842 record the given order of parms in `parm_order'. */
3845 push_parm_decl (parm)
3849 int old_immediate_size_expand = immediate_size_expand;
3850 /* Don't try computing parm sizes now -- wait till fn is called. */
3851 immediate_size_expand = 0;
3853 /* The corresponding pop_obstacks is in finish_decl. */
3854 push_obstacks_nochange ();
3856 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3857 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3858 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3859 TREE_PURPOSE (TREE_VALUE (parm)));
3862 if (DECL_NAME (decl))
3865 olddecl = lookup_name (DECL_NAME (decl));
3866 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3867 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3871 decl = pushdecl (decl);
3873 immediate_size_expand = old_immediate_size_expand;
3875 current_binding_level->parm_order
3876 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3878 /* Add this decl to the current binding level. */
3879 finish_decl (decl, NULL_TREE, NULL_TREE);
3882 /* Clear the given order of parms in `parm_order'.
3883 Used at start of parm list,
3884 and also at semicolon terminating forward decls. */
3889 current_binding_level->parm_order = NULL_TREE;
3892 /* Make TYPE a complete type based on INITIAL_VALUE.
3893 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3894 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3897 complete_array_type (type, initial_value, do_default)
3902 register tree maxindex = NULL_TREE;
3907 /* Note MAXINDEX is really the maximum index,
3908 one less than the size. */
3909 if (TREE_CODE (initial_value) == STRING_CST)
3912 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3913 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3916 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3918 tree elts = CONSTRUCTOR_ELTS (initial_value);
3919 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3920 for (; elts; elts = TREE_CHAIN (elts))
3922 if (TREE_PURPOSE (elts))
3923 maxindex = TREE_PURPOSE (elts);
3925 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3927 maxindex = copy_node (maxindex);
3931 /* Make an error message unless that happened already. */
3932 if (initial_value != error_mark_node)
3935 /* Prevent further error messages. */
3936 maxindex = build_int_2 (0, 0);
3943 maxindex = build_int_2 (0, 0);
3949 TYPE_DOMAIN (type) = build_index_type (maxindex);
3950 if (!TREE_TYPE (maxindex))
3951 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3954 /* Lay out the type now that we can get the real answer. */
3961 /* Given declspecs and a declarator,
3962 determine the name and type of the object declared
3963 and construct a ..._DECL node for it.
3964 (In one case we can return a ..._TYPE node instead.
3965 For invalid input we sometimes return 0.)
3967 DECLSPECS is a chain of tree_list nodes whose value fields
3968 are the storage classes and type specifiers.
3970 DECL_CONTEXT says which syntactic context this declaration is in:
3971 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3972 FUNCDEF for a function definition. Like NORMAL but a few different
3973 error messages in each case. Return value may be zero meaning
3974 this definition is too screwy to try to parse.
3975 PARM for a parameter declaration (either within a function prototype
3976 or before a function body). Make a PARM_DECL, or return void_type_node.
3977 TYPENAME if for a typename (in a cast or sizeof).
3978 Don't make a DECL node; just return the ..._TYPE node.
3979 FIELD for a struct or union field; make a FIELD_DECL.
3980 BITFIELD for a field with specified width.
3981 INITIALIZED is 1 if the decl has an initializer.
3983 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3984 It may also be so in the PARM case, for a prototype where the
3985 argument type is specified but not the name.
3987 This function is where the complicated C meanings of `static'
3988 and `extern' are interpreted. */
3991 grokdeclarator (declarator, declspecs, decl_context, initialized)
3994 enum decl_context decl_context;
3999 tree type = NULL_TREE;
4004 int type_quals = TYPE_UNQUALIFIED;
4006 int explicit_int = 0;
4007 int explicit_char = 0;
4008 int defaulted_int = 0;
4009 tree typedef_decl = 0;
4011 tree typedef_type = 0;
4012 int funcdef_flag = 0;
4013 enum tree_code innermost_code = ERROR_MARK;
4015 int size_varies = 0;
4016 tree decl_machine_attr = NULL_TREE;
4018 if (decl_context == BITFIELD)
4019 bitfield = 1, decl_context = FIELD;
4021 if (decl_context == FUNCDEF)
4022 funcdef_flag = 1, decl_context = NORMAL;
4024 push_obstacks_nochange ();
4026 if (flag_traditional && allocation_temporary_p ())
4027 end_temporary_allocation ();
4029 /* Look inside a declarator for the name being declared
4030 and get it as a string, for an error message. */
4032 register tree decl = declarator;
4036 switch (TREE_CODE (decl))
4041 innermost_code = TREE_CODE (decl);
4042 decl = TREE_OPERAND (decl, 0);
4045 case IDENTIFIER_NODE:
4046 name = IDENTIFIER_POINTER (decl);
4057 /* A function definition's declarator must have the form of
4058 a function declarator. */
4060 if (funcdef_flag && innermost_code != CALL_EXPR)
4063 /* Anything declared one level down from the top level
4064 must be one of the parameters of a function
4065 (because the body is at least two levels down). */
4067 /* If this looks like a function definition, make it one,
4068 even if it occurs where parms are expected.
4069 Then store_parm_decls will reject it and not use it as a parm. */
4070 if (decl_context == NORMAL && !funcdef_flag
4071 && current_binding_level->parm_flag)
4072 decl_context = PARM;
4074 /* Look through the decl specs and record which ones appear.
4075 Some typespecs are defined as built-in typenames.
4076 Others, the ones that are modifiers of other types,
4077 are represented by bits in SPECBITS: set the bits for
4078 the modifiers that appear. Storage class keywords are also in SPECBITS.
4080 If there is a typedef name or a type, store the type in TYPE.
4081 This includes builtin typedefs such as `int'.
4083 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4084 and did not come from a user typedef.
4086 Set LONGLONG if `long' is mentioned twice. */
4088 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4091 register tree id = TREE_VALUE (spec);
4093 if (id == ridpointers[(int) RID_INT])
4095 if (id == ridpointers[(int) RID_CHAR])
4098 if (TREE_CODE (id) == IDENTIFIER_NODE)
4099 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4101 if (ridpointers[i] == id)
4103 if (i == (int) RID_LONG && specbits & (1<<i))
4106 error ("`long long long' is too long for GCC");
4109 if (pedantic && ! in_system_header && warn_long_long)
4110 pedwarn ("ANSI C does not support `long long'");
4114 else if (specbits & (1 << i))
4115 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4121 error ("two or more data types in declaration of `%s'", name);
4122 /* Actual typedefs come to us as TYPE_DECL nodes. */
4123 else if (TREE_CODE (id) == TYPE_DECL)
4125 type = TREE_TYPE (id);
4126 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4129 /* Built-in types come as identifiers. */
4130 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4132 register tree t = lookup_name (id);
4133 if (TREE_TYPE (t) == error_mark_node)
4135 else if (!t || TREE_CODE (t) != TYPE_DECL)
4136 error ("`%s' fails to be a typedef or built in type",
4137 IDENTIFIER_POINTER (id));
4140 type = TREE_TYPE (t);
4144 else if (TREE_CODE (id) != ERROR_MARK)
4150 typedef_type = type;
4152 size_varies = C_TYPE_VARIABLE_SIZE (type);
4154 /* No type at all: default to `int', and set DEFAULTED_INT
4155 because it was not a user-defined typedef. */
4159 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4160 | (1 << (int) RID_SIGNED)
4161 | (1 << (int) RID_UNSIGNED))))
4162 /* Don't warn about typedef foo = bar. */
4163 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4164 && ! (in_system_header && ! allocation_temporary_p ()))
4166 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4167 and this is a function, or if -Wimplicit; prefer the former
4168 warning since it is more explicit. */
4169 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4170 warn_about_return_type = 1;
4171 else if (warn_implicit_int || flag_isoc9x)
4172 warning ("type defaults to `int' in declaration of `%s'", name);
4176 type = integer_type_node;
4179 /* Now process the modifiers that were specified
4180 and check for invalid combinations. */
4182 /* Long double is a special combination. */
4184 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4185 && TYPE_MAIN_VARIANT (type) == double_type_node)
4187 specbits &= ~ (1 << (int) RID_LONG);
4188 type = long_double_type_node;
4191 /* Check all other uses of type modifiers. */
4193 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4194 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4198 if ((specbits & 1 << (int) RID_LONG)
4199 && (specbits & 1 << (int) RID_SHORT))
4200 error ("both long and short specified for `%s'", name);
4201 else if (((specbits & 1 << (int) RID_LONG)
4202 || (specbits & 1 << (int) RID_SHORT))
4204 error ("long or short specified with char for `%s'", name);
4205 else if (((specbits & 1 << (int) RID_LONG)
4206 || (specbits & 1 << (int) RID_SHORT))
4207 && TREE_CODE (type) == REAL_TYPE)
4209 static int already = 0;
4211 error ("long or short specified with floating type for `%s'", name);
4212 if (! already && ! pedantic)
4214 error ("the only valid combination is `long double'");
4218 else if ((specbits & 1 << (int) RID_SIGNED)
4219 && (specbits & 1 << (int) RID_UNSIGNED))
4220 error ("both signed and unsigned specified for `%s'", name);
4221 else if (TREE_CODE (type) != INTEGER_TYPE)
4222 error ("long, short, signed or unsigned invalid for `%s'", name);
4226 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4228 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4230 if (flag_pedantic_errors)
4235 /* Discard the type modifiers if they are invalid. */
4238 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4239 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4244 if ((specbits & (1 << (int) RID_COMPLEX))
4245 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4247 error ("complex invalid for `%s'", name);
4248 specbits &= ~ (1 << (int) RID_COMPLEX);
4251 /* Decide whether an integer type is signed or not.
4252 Optionally treat bitfields as signed by default. */
4253 if (specbits & 1 << (int) RID_UNSIGNED
4254 /* Traditionally, all bitfields are unsigned. */
4255 || (bitfield && flag_traditional
4256 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4257 || (bitfield && ! flag_signed_bitfields
4258 && (explicit_int || defaulted_int || explicit_char
4259 /* A typedef for plain `int' without `signed'
4260 can be controlled just like plain `int'. */
4261 || ! (typedef_decl != 0
4262 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4263 && TREE_CODE (type) != ENUMERAL_TYPE
4264 && !(specbits & 1 << (int) RID_SIGNED)))
4267 type = long_long_unsigned_type_node;
4268 else if (specbits & 1 << (int) RID_LONG)
4269 type = long_unsigned_type_node;
4270 else if (specbits & 1 << (int) RID_SHORT)
4271 type = short_unsigned_type_node;
4272 else if (type == char_type_node)
4273 type = unsigned_char_type_node;
4274 else if (typedef_decl)
4275 type = unsigned_type (type);
4277 type = unsigned_type_node;
4279 else if ((specbits & 1 << (int) RID_SIGNED)
4280 && type == char_type_node)
4281 type = signed_char_type_node;
4283 type = long_long_integer_type_node;
4284 else if (specbits & 1 << (int) RID_LONG)
4285 type = long_integer_type_node;
4286 else if (specbits & 1 << (int) RID_SHORT)
4287 type = short_integer_type_node;
4289 if (specbits & 1 << (int) RID_COMPLEX)
4291 /* If we just have "complex", it is equivalent to
4292 "complex double", but if any modifiers at all are specified it is
4293 the complex form of TYPE. E.g, "complex short" is
4294 "complex short int". */
4296 if (defaulted_int && ! longlong
4297 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4298 | (1 << (int) RID_SIGNED)
4299 | (1 << (int) RID_UNSIGNED))))
4300 type = complex_double_type_node;
4301 else if (type == integer_type_node)
4302 type = complex_integer_type_node;
4303 else if (type == float_type_node)
4304 type = complex_float_type_node;
4305 else if (type == double_type_node)
4306 type = complex_double_type_node;
4307 else if (type == long_double_type_node)
4308 type = complex_long_double_type_node;
4310 type = build_complex_type (type);
4313 /* Figure out the type qualifiers for the declaration. There are
4314 two ways a declaration can become qualified. One is something
4315 like `const int i' where the `const' is explicit. Another is
4316 something like `typedef const int CI; CI i' where the type of the
4317 declaration contains the `const'. */
4318 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4319 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4320 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4321 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4323 pedwarn ("duplicate `const'");
4325 pedwarn ("duplicate `restrict'");
4327 pedwarn ("duplicate `volatile'");
4328 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4329 type = TYPE_MAIN_VARIANT (type);
4330 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4331 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4332 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4334 /* Warn if two storage classes are given. Default to `auto'. */
4339 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4340 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4341 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4342 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4343 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4344 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4346 /* Warn about storage classes that are invalid for certain
4347 kinds of declarations (parameters, typenames, etc.). */
4350 error ("multiple storage classes in declaration of `%s'", name);
4351 else if (funcdef_flag
4353 & ((1 << (int) RID_REGISTER)
4354 | (1 << (int) RID_AUTO)
4355 | (1 << (int) RID_TYPEDEF))))
4357 if (specbits & 1 << (int) RID_AUTO
4358 && (pedantic || current_binding_level == global_binding_level))
4359 pedwarn ("function definition declared `auto'");
4360 if (specbits & 1 << (int) RID_REGISTER)
4361 error ("function definition declared `register'");
4362 if (specbits & 1 << (int) RID_TYPEDEF)
4363 error ("function definition declared `typedef'");
4364 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4365 | (1 << (int) RID_AUTO));
4367 else if (decl_context != NORMAL && nclasses > 0)
4369 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4373 error ((decl_context == FIELD
4374 ? "storage class specified for structure field `%s'"
4375 : (decl_context == PARM
4376 ? "storage class specified for parameter `%s'"
4377 : "storage class specified for typename")),
4379 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4380 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4381 | (1 << (int) RID_EXTERN));
4384 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4386 /* `extern' with initialization is invalid if not at top level. */
4387 if (current_binding_level == global_binding_level)
4388 warning ("`%s' initialized and declared `extern'", name);
4390 error ("`%s' has both `extern' and initializer", name);
4392 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4393 && current_binding_level != global_binding_level)
4394 error ("nested function `%s' declared `extern'", name);
4395 else if (current_binding_level == global_binding_level
4396 && specbits & (1 << (int) RID_AUTO))
4397 error ("top-level declaration of `%s' specifies `auto'", name);
4398 else if ((specbits & 1 << (int) RID_ITERATOR)
4399 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4401 error ("iterator `%s' has derived type", name);
4402 type = error_mark_node;
4404 else if ((specbits & 1 << (int) RID_ITERATOR)
4405 && TREE_CODE (type) != INTEGER_TYPE)
4407 error ("iterator `%s' has noninteger type", name);
4408 type = error_mark_node;
4412 /* Now figure out the structure of the declarator proper.
4413 Descend through it, creating more complex types, until we reach
4414 the declared identifier (or NULL_TREE, in an absolute declarator). */
4416 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4418 if (type == error_mark_node)
4420 declarator = TREE_OPERAND (declarator, 0);
4424 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4425 an INDIRECT_REF (for *...),
4426 a CALL_EXPR (for ...(...)),
4427 an identifier (for the name being declared)
4428 or a null pointer (for the place in an absolute declarator
4429 where the name was omitted).
4430 For the last two cases, we have just exited the loop.
4432 At this point, TYPE is the type of elements of an array,
4433 or for a function to return, or for a pointer to point to.
4434 After this sequence of ifs, TYPE is the type of the
4435 array or function or pointer, and DECLARATOR has had its
4436 outermost layer removed. */
4438 if (TREE_CODE (declarator) == ARRAY_REF)
4440 register tree itype = NULL_TREE;
4441 register tree size = TREE_OPERAND (declarator, 1);
4442 /* An uninitialized decl with `extern' is a reference. */
4443 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4444 /* The index is a signed object `sizetype' bits wide. */
4445 tree index_type = signed_type (sizetype);
4447 declarator = TREE_OPERAND (declarator, 0);
4449 /* Check for some types that there cannot be arrays of. */
4451 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4453 error ("declaration of `%s' as array of voids", name);
4454 type = error_mark_node;
4457 if (TREE_CODE (type) == FUNCTION_TYPE)
4459 error ("declaration of `%s' as array of functions", name);
4460 type = error_mark_node;
4463 if (size == error_mark_node)
4464 type = error_mark_node;
4466 if (type == error_mark_node)
4469 /* If this is a block level extern, it must live past the end
4470 of the function so that we can check it against other extern
4471 declarations (IDENTIFIER_LIMBO_VALUE). */
4472 if (extern_ref && allocation_temporary_p ())
4473 end_temporary_allocation ();
4475 /* If size was specified, set ITYPE to a range-type for that size.
4476 Otherwise, ITYPE remains null. finish_decl may figure it out
4477 from an initial value. */
4481 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4482 STRIP_TYPE_NOPS (size);
4484 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4485 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4487 error ("size of array `%s' has non-integer type", name);
4488 size = integer_one_node;
4491 if (pedantic && integer_zerop (size))
4492 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4494 if (TREE_CODE (size) == INTEGER_CST)
4496 constant_expression_warning (size);
4497 if (tree_int_cst_sgn (size) < 0)
4499 error ("size of array `%s' is negative", name);
4500 size = integer_one_node;
4505 /* Make sure the array size remains visibly nonconstant
4506 even if it is (eg) a const variable with known value. */
4511 if (TREE_CONSTANT (size))
4512 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4514 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4518 /* Convert size to index_type, so that if it is a variable
4519 the computations will be done in the proper mode. */
4520 itype = fold (build (MINUS_EXPR, index_type,
4521 convert (index_type, size),
4522 convert (index_type, size_one_node)));
4524 /* If that overflowed, the array is too big.
4525 ??? While a size of INT_MAX+1 technically shouldn't cause
4526 an overflow (because we subtract 1), the overflow is recorded
4527 during the conversion to index_type, before the subtraction.
4528 Handling this case seems like an unnecessary complication. */
4529 if (TREE_OVERFLOW (itype))
4531 error ("size of array `%s' is too large", name);
4532 type = error_mark_node;
4537 itype = variable_size (itype);
4538 itype = build_index_type (itype);
4541 #if 0 /* This had bad results for pointers to arrays, as in
4542 union incomplete (*foo)[4]; */
4543 /* Complain about arrays of incomplete types, except in typedefs. */
4545 if (TYPE_SIZE (type) == 0
4546 /* Avoid multiple warnings for nested array types. */
4547 && TREE_CODE (type) != ARRAY_TYPE
4548 && !(specbits & (1 << (int) RID_TYPEDEF))
4549 && !C_TYPE_BEING_DEFINED (type))
4550 warning ("array type has incomplete element type");
4553 #if 0 /* We shouldn't have a function type here at all!
4554 Functions aren't allowed as array elements. */
4555 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4556 && (constp || volatilep))
4557 pedwarn ("ANSI C forbids const or volatile function types");
4560 /* Build the array type itself, then merge any constancy or
4561 volatility into the target type. We must do it in this order
4562 to ensure that the TYPE_MAIN_VARIANT field of the array type
4563 is set correctly. */
4565 type = build_array_type (type, itype);
4567 type = c_build_qualified_type (type, type_quals);
4569 #if 0 /* don't clear these; leave them set so that the array type
4570 or the variable is itself const or volatile. */
4571 type_quals = TYPE_UNQUALIFIED;
4575 C_TYPE_VARIABLE_SIZE (type) = 1;
4577 else if (TREE_CODE (declarator) == CALL_EXPR)
4579 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4580 || current_binding_level == global_binding_level);
4583 /* Declaring a function type.
4584 Make sure we have a valid type for the function to return. */
4585 if (type == error_mark_node)
4590 /* Warn about some types functions can't return. */
4592 if (TREE_CODE (type) == FUNCTION_TYPE)
4594 error ("`%s' declared as function returning a function", name);
4595 type = integer_type_node;
4597 if (TREE_CODE (type) == ARRAY_TYPE)
4599 error ("`%s' declared as function returning an array", name);
4600 type = integer_type_node;
4603 #ifndef TRADITIONAL_RETURN_FLOAT
4604 /* Traditionally, declaring return type float means double. */
4606 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4607 type = double_type_node;
4608 #endif /* TRADITIONAL_RETURN_FLOAT */
4610 /* If this is a block level extern, it must live past the end
4611 of the function so that we can check it against other extern
4612 declarations (IDENTIFIER_LIMBO_VALUE). */
4613 if (extern_ref && allocation_temporary_p ())
4614 end_temporary_allocation ();
4616 /* Construct the function type and go to the next
4617 inner layer of declarator. */
4619 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4621 /* Say it's a definition
4622 only for the CALL_EXPR
4623 closest to the identifier. */
4624 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4625 #if 0 /* This seems to be false. We turn off temporary allocation
4626 above in this function if -traditional.
4627 And this code caused inconsistent results with prototypes:
4628 callers would ignore them, and pass arguments wrong. */
4630 /* Omit the arg types if -traditional, since the arg types
4631 and the list links might not be permanent. */
4632 type = build_function_type (type,
4634 ? NULL_TREE : arg_types);
4636 /* Type qualifiers before the return type of the function
4637 qualify the return type, not the function type. */
4639 type = c_build_qualified_type (type, type_quals);
4640 type_quals = TYPE_UNQUALIFIED;
4642 type = build_function_type (type, arg_types);
4643 declarator = TREE_OPERAND (declarator, 0);
4645 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4646 the formal parameter list of this FUNCTION_TYPE to point to
4647 the FUNCTION_TYPE node itself. */
4652 for (link = last_function_parm_tags;
4654 link = TREE_CHAIN (link))
4655 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4658 else if (TREE_CODE (declarator) == INDIRECT_REF)
4660 /* Merge any constancy or volatility into the target type
4663 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4665 pedwarn ("ANSI C forbids qualified function types");
4667 type = c_build_qualified_type (type, type_quals);
4668 type_quals = TYPE_UNQUALIFIED;
4671 type = build_pointer_type (type);
4673 /* Process a list of type modifier keywords
4674 (such as const or volatile) that were given inside the `*'. */
4676 if (TREE_TYPE (declarator))
4678 register tree typemodlist;
4684 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4685 typemodlist = TREE_CHAIN (typemodlist))
4687 tree qualifier = TREE_VALUE (typemodlist);
4689 if (qualifier == ridpointers[(int) RID_CONST])
4691 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4693 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4698 error ("invalid type modifier within pointer declarator");
4702 pedwarn ("duplicate `const'");
4704 pedwarn ("duplicate `volatile'");
4706 pedwarn ("duplicate `restrict'");
4708 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4709 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4710 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4713 declarator = TREE_OPERAND (declarator, 0);
4720 /* Now TYPE has the actual type. */
4722 /* Did array size calculations overflow? */
4724 if (TREE_CODE (type) == ARRAY_TYPE
4726 && TREE_OVERFLOW (TYPE_SIZE (type)))
4727 error ("size of array `%s' is too large", name);
4729 /* If this is declaring a typedef name, return a TYPE_DECL. */
4731 if (specbits & (1 << (int) RID_TYPEDEF))
4734 /* Note that the grammar rejects storage classes
4735 in typenames, fields or parameters */
4736 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4738 pedwarn ("ANSI C forbids qualified function types");
4740 type = c_build_qualified_type (type, type_quals);
4741 decl = build_decl (TYPE_DECL, declarator, type);
4742 if ((specbits & (1 << (int) RID_SIGNED))
4743 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4744 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4749 /* Detect the case of an array type of unspecified size
4750 which came, as such, direct from a typedef name.
4751 We must copy the type, so that each identifier gets
4752 a distinct type, so that each identifier's size can be
4753 controlled separately by its own initializer. */
4755 if (type != 0 && typedef_type != 0
4756 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4757 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4759 type = build_array_type (TREE_TYPE (type), 0);
4761 C_TYPE_VARIABLE_SIZE (type) = 1;
4764 /* If this is a type name (such as, in a cast or sizeof),
4765 compute the type and return it now. */
4767 if (decl_context == TYPENAME)
4769 /* Note that the grammar rejects storage classes
4770 in typenames, fields or parameters */
4771 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4773 pedwarn ("ANSI C forbids const or volatile function types");
4775 type = c_build_qualified_type (type, type_quals);
4780 /* Aside from typedefs and type names (handle above),
4781 `void' at top level (not within pointer)
4782 is allowed only in public variables.
4783 We don't complain about parms either, but that is because
4784 a better error message can be made later. */
4786 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4787 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4788 && ((specbits & (1 << (int) RID_EXTERN))
4789 || (current_binding_level == global_binding_level
4791 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4793 error ("variable or field `%s' declared void", name);
4794 type = integer_type_node;
4797 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4798 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4803 if (decl_context == PARM)
4805 tree type_as_written = type;
4808 /* A parameter declared as an array of T is really a pointer to T.
4809 One declared as a function is really a pointer to a function. */
4811 if (TREE_CODE (type) == ARRAY_TYPE)
4813 /* Transfer const-ness of array into that of type pointed to. */
4814 type = TREE_TYPE (type);
4816 type = c_build_qualified_type (type, type_quals);
4817 type = build_pointer_type (type);
4818 type_quals = TYPE_UNQUALIFIED;
4821 else if (TREE_CODE (type) == FUNCTION_TYPE)
4823 if (pedantic && type_quals)
4824 pedwarn ("ANSI C forbids qualified function types");
4826 type = c_build_qualified_type (type, type_quals);
4827 type = build_pointer_type (type);
4828 type_quals = TYPE_UNQUALIFIED;
4831 decl = build_decl (PARM_DECL, declarator, type);
4833 C_DECL_VARIABLE_SIZE (decl) = 1;
4835 /* Compute the type actually passed in the parmlist,
4836 for the case where there is no prototype.
4837 (For example, shorts and chars are passed as ints.)
4838 When there is a prototype, this is overridden later. */
4840 DECL_ARG_TYPE (decl) = type;
4841 main_type = (type == error_mark_node
4843 : TYPE_MAIN_VARIANT (type));
4844 if (main_type == float_type_node)
4845 DECL_ARG_TYPE (decl) = double_type_node;
4846 /* Don't use TYPE_PRECISION to decide whether to promote,
4847 because we should convert short if it's the same size as int,
4848 but we should not convert long if it's the same size as int. */
4849 else if (TREE_CODE (main_type) != ERROR_MARK
4850 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4852 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4853 && TREE_UNSIGNED (type))
4854 DECL_ARG_TYPE (decl) = unsigned_type_node;
4856 DECL_ARG_TYPE (decl) = integer_type_node;
4859 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4861 else if (decl_context == FIELD)
4863 /* Structure field. It may not be a function. */
4865 if (TREE_CODE (type) == FUNCTION_TYPE)
4867 error ("field `%s' declared as a function", name);
4868 type = build_pointer_type (type);
4870 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4872 error ("field `%s' has incomplete type", name);
4873 type = error_mark_node;
4875 /* Move type qualifiers down to element of an array. */
4876 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4878 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4880 TYPE_DOMAIN (type));
4881 #if 0 /* Leave the field const or volatile as well. */
4882 type_quals = TYPE_UNQUALIFIED;
4885 decl = build_decl (FIELD_DECL, declarator, type);
4887 C_DECL_VARIABLE_SIZE (decl) = 1;
4889 else if (TREE_CODE (type) == FUNCTION_TYPE)
4891 /* Every function declaration is "external"
4892 except for those which are inside a function body
4893 in which `auto' is used.
4894 That is a case not specified by ANSI C,
4895 and we use it for forward declarations for nested functions. */
4896 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4897 || current_binding_level == global_binding_level);
4899 if (specbits & (1 << (int) RID_AUTO)
4900 && (pedantic || current_binding_level == global_binding_level))
4901 pedwarn ("invalid storage class for function `%s'", name);
4902 if (specbits & (1 << (int) RID_REGISTER))
4903 error ("invalid storage class for function `%s'", name);
4904 /* Function declaration not at top level.
4905 Storage classes other than `extern' are not allowed
4906 and `extern' makes no difference. */
4907 if (current_binding_level != global_binding_level
4908 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4910 pedwarn ("invalid storage class for function `%s'", name);
4912 /* If this is a block level extern, it must live past the end
4913 of the function so that we can check it against other
4914 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4915 if (extern_ref && allocation_temporary_p ())
4916 end_temporary_allocation ();
4918 decl = build_decl (FUNCTION_DECL, declarator, type);
4919 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4921 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4922 pedwarn ("ANSI C forbids qualified function types");
4925 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4926 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4927 && ! DECL_IN_SYSTEM_HEADER (decl))
4928 pedwarn ("ANSI C forbids qualified void function return type");
4930 /* GNU C interprets a `volatile void' return type to indicate
4931 that the function does not return. */
4932 if ((type_quals & TYPE_QUAL_VOLATILE)
4933 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4934 warning ("`noreturn' function returns non-void value");
4937 DECL_EXTERNAL (decl) = 1;
4938 /* Record absence of global scope for `static' or `auto'. */
4940 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4942 /* Record presence of `inline', if it is reasonable. */
4945 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4946 warning ("cannot inline function `main'");
4948 /* Assume that otherwise the function can be inlined. */
4949 DECL_INLINE (decl) = 1;
4951 if (specbits & (1 << (int) RID_EXTERN))
4952 current_extern_inline = 1;
4957 /* It's a variable. */
4958 /* An uninitialized decl with `extern' is a reference. */
4959 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4961 /* Move type qualifiers down to element of an array. */
4962 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4964 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4966 TYPE_DOMAIN (type));
4967 #if 0 /* Leave the variable const or volatile as well. */
4968 type_quals = TYPE_UNQUALIFIED;
4972 /* If this is a block level extern, it must live past the end
4973 of the function so that we can check it against other
4974 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4975 if (extern_ref && allocation_temporary_p ())
4976 end_temporary_allocation ();
4978 decl = build_decl (VAR_DECL, declarator, type);
4980 C_DECL_VARIABLE_SIZE (decl) = 1;
4983 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4985 DECL_EXTERNAL (decl) = extern_ref;
4986 /* At top level, the presence of a `static' or `register' storage
4987 class specifier, or the absence of all storage class specifiers
4988 makes this declaration a definition (perhaps tentative). Also,
4989 the absence of both `static' and `register' makes it public. */
4990 if (current_binding_level == global_binding_level)
4994 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4995 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4997 /* Not at top level, only `static' makes a static definition. */
5000 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5001 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5004 if (specbits & 1 << (int) RID_ITERATOR)
5005 ITERATOR_P (decl) = 1;
5008 /* Record `register' declaration for warnings on &
5009 and in case doing stupid register allocation. */
5011 if (specbits & (1 << (int) RID_REGISTER))
5012 DECL_REGISTER (decl) = 1;
5014 /* Record constancy and volatility. */
5015 c_apply_type_quals_to_decl (type_quals, decl);
5017 /* If a type has volatile components, it should be stored in memory.
5018 Otherwise, the fact that those components are volatile
5019 will be ignored, and would even crash the compiler. */
5020 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5021 mark_addressable (decl);
5029 /* Decode the parameter-list info for a function type or function definition.
5030 The argument is the value returned by `get_parm_info' (or made in parse.y
5031 if there is an identifier list instead of a parameter decl list).
5032 These two functions are separate because when a function returns
5033 or receives functions then each is called multiple times but the order
5034 of calls is different. The last call to `grokparms' is always the one
5035 that contains the formal parameter names of a function definition.
5037 Store in `last_function_parms' a chain of the decls of parms.
5038 Also store in `last_function_parm_tags' a chain of the struct, union,
5039 and enum tags declared among the parms.
5041 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5043 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5044 a mere declaration. A nonempty identifier-list gets an error message
5045 when FUNCDEF_FLAG is zero. */
5048 grokparms (parms_info, funcdef_flag)
5052 tree first_parm = TREE_CHAIN (parms_info);
5054 last_function_parms = TREE_PURPOSE (parms_info);
5055 last_function_parm_tags = TREE_VALUE (parms_info);
5057 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5058 && !in_system_header)
5059 warning ("function declaration isn't a prototype");
5062 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5065 pedwarn ("parameter names (without types) in function declaration");
5067 last_function_parms = first_parm;
5074 /* We no longer test FUNCDEF_FLAG.
5075 If the arg types are incomplete in a declaration,
5076 they must include undefined tags.
5077 These tags can never be defined in the scope of the declaration,
5078 so the types can never be completed,
5079 and no call can be compiled successfully. */
5081 /* In a fcn definition, arg types must be complete. */
5084 for (parm = last_function_parms, typelt = first_parm;
5086 parm = TREE_CHAIN (parm))
5087 /* Skip over any enumeration constants declared here. */
5088 if (TREE_CODE (parm) == PARM_DECL)
5090 /* Barf if the parameter itself has an incomplete type. */
5091 tree type = TREE_VALUE (typelt);
5092 if (TYPE_SIZE (type) == 0)
5094 if (funcdef_flag && DECL_NAME (parm) != 0)
5095 error ("parameter `%s' has incomplete type",
5096 IDENTIFIER_POINTER (DECL_NAME (parm)));
5098 warning ("parameter has incomplete type");
5101 TREE_VALUE (typelt) = error_mark_node;
5102 TREE_TYPE (parm) = error_mark_node;
5105 #if 0 /* This has been replaced by parm_tags_warning
5106 which uses a more accurate criterion for what to warn about. */
5109 /* Now warn if is a pointer to an incomplete type. */
5110 while (TREE_CODE (type) == POINTER_TYPE
5111 || TREE_CODE (type) == REFERENCE_TYPE)
5112 type = TREE_TYPE (type);
5113 type = TYPE_MAIN_VARIANT (type);
5114 if (TYPE_SIZE (type) == 0)
5116 if (DECL_NAME (parm) != 0)
5117 warning ("parameter `%s' points to incomplete type",
5118 IDENTIFIER_POINTER (DECL_NAME (parm)));
5120 warning ("parameter points to incomplete type");
5124 typelt = TREE_CHAIN (typelt);
5127 /* Allocate the list of types the way we allocate a type. */
5128 if (first_parm && ! TREE_PERMANENT (first_parm))
5130 /* Construct a copy of the list of types
5131 on the saveable obstack. */
5133 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5134 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5136 return nreverse (result);
5139 /* The list we have is permanent already. */
5145 /* Return a tree_list node with info on a parameter list just parsed.
5146 The TREE_PURPOSE is a chain of decls of those parms.
5147 The TREE_VALUE is a list of structure, union and enum tags defined.
5148 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5149 This tree_list node is later fed to `grokparms'.
5151 VOID_AT_END nonzero means append `void' to the end of the type-list.
5152 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5155 get_parm_info (void_at_end)
5158 register tree decl, t;
5159 register tree types = 0;
5161 tree tags = gettags ();
5162 tree parms = getdecls ();
5164 tree order = current_binding_level->parm_order;
5166 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5167 if (void_at_end && parms != 0
5168 && TREE_CHAIN (parms) == 0
5169 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5170 && DECL_NAME (parms) == 0)
5173 storedecls (NULL_TREE);
5174 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5175 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5178 /* Extract enumerator values and other non-parms declared with the parms.
5179 Likewise any forward parm decls that didn't have real parm decls. */
5180 for (decl = parms; decl; )
5182 tree next = TREE_CHAIN (decl);
5184 if (TREE_CODE (decl) != PARM_DECL)
5186 TREE_CHAIN (decl) = new_parms;
5189 else if (TREE_ASM_WRITTEN (decl))
5191 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5192 TREE_CHAIN (decl) = new_parms;
5198 /* Put the parm decls back in the order they were in in the parm list. */
5199 for (t = order; t; t = TREE_CHAIN (t))
5202 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5204 TREE_CHAIN (TREE_VALUE (t)) = 0;
5207 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5210 /* Store the parmlist in the binding level since the old one
5211 is no longer a valid list. (We have changed the chain pointers.) */
5212 storedecls (new_parms);
5214 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5215 /* There may also be declarations for enumerators if an enumeration
5216 type is declared among the parms. Ignore them here. */
5217 if (TREE_CODE (decl) == PARM_DECL)
5219 /* Since there is a prototype,
5220 args are passed in their declared types. */
5221 tree type = TREE_TYPE (decl);
5222 DECL_ARG_TYPE (decl) = type;
5223 if (PROMOTE_PROTOTYPES
5224 && (TREE_CODE (type) == INTEGER_TYPE
5225 || TREE_CODE (type) == ENUMERAL_TYPE)
5226 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5227 DECL_ARG_TYPE (decl) = integer_type_node;
5229 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5230 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5231 && DECL_NAME (decl) == 0)
5233 error ("`void' in parameter list must be the entire list");
5239 return saveable_tree_cons (new_parms, tags,
5240 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5242 return saveable_tree_cons (new_parms, tags, nreverse (types));
5245 /* At end of parameter list, warn about any struct, union or enum tags
5246 defined within. Do so because these types cannot ever become complete. */
5249 parmlist_tags_warning ()
5254 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5256 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5257 /* An anonymous union parm type is meaningful as a GNU extension.
5258 So don't warn for that. */
5259 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5261 if (TREE_PURPOSE (elt) != 0)
5262 warning ("`%s %s' declared inside parameter list",
5263 (code == RECORD_TYPE ? "struct"
5264 : code == UNION_TYPE ? "union"
5266 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5268 warning ("anonymous %s declared inside parameter list",
5269 (code == RECORD_TYPE ? "struct"
5270 : code == UNION_TYPE ? "union"
5275 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5281 /* Get the struct, enum or union (CODE says which) with tag NAME.
5282 Define the tag as a forward-reference if it is not defined. */
5285 xref_tag (code, name)
5286 enum tree_code code;
5289 int temporary = allocation_temporary_p ();
5291 /* If a cross reference is requested, look up the type
5292 already defined for this tag and return it. */
5294 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5295 /* Even if this is the wrong type of tag, return what we found.
5296 There will be an error message anyway, from pending_xref_error.
5297 If we create an empty xref just for an invalid use of the type,
5298 the main result is to create lots of superfluous error messages. */
5302 push_obstacks_nochange ();
5304 if (current_binding_level == global_binding_level && temporary)
5305 end_temporary_allocation ();
5307 /* If no such tag is yet defined, create a forward-reference node
5308 and record it as the "definition".
5309 When a real declaration of this type is found,
5310 the forward-reference will be altered into a real type. */
5312 ref = make_node (code);
5313 if (code == ENUMERAL_TYPE)
5315 /* (In ANSI, Enums can be referred to only if already defined.) */
5317 pedwarn ("ANSI C forbids forward references to `enum' types");
5318 /* Give the type a default layout like unsigned int
5319 to avoid crashing if it does not get defined. */
5320 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5321 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5322 TREE_UNSIGNED (ref) = 1;
5323 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5324 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5325 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5328 pushtag (name, ref);
5335 /* Make sure that the tag NAME is defined *in the current binding level*
5336 at least as a forward reference.
5337 CODE says which kind of tag NAME ought to be.
5339 We also do a push_obstacks_nochange
5340 whose matching pop is in finish_struct. */
5343 start_struct (code, name)
5344 enum tree_code code;
5347 /* If there is already a tag defined at this binding level
5348 (as a forward reference), just return it. */
5350 register tree ref = 0;
5352 push_obstacks_nochange ();
5353 if (current_binding_level == global_binding_level)
5354 end_temporary_allocation ();
5357 ref = lookup_tag (code, name, current_binding_level, 1);
5358 if (ref && TREE_CODE (ref) == code)
5360 C_TYPE_BEING_DEFINED (ref) = 1;
5361 TYPE_PACKED (ref) = flag_pack_struct;
5362 if (TYPE_FIELDS (ref))
5363 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5364 : "redefinition of `struct %s'"),
5365 IDENTIFIER_POINTER (name));
5370 /* Otherwise create a forward-reference just so the tag is in scope. */
5372 ref = make_node (code);
5373 pushtag (name, ref);
5374 C_TYPE_BEING_DEFINED (ref) = 1;
5375 TYPE_PACKED (ref) = flag_pack_struct;
5379 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5380 of a structure component, returning a FIELD_DECL node.
5381 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5383 This is done during the parsing of the struct declaration.
5384 The FIELD_DECL nodes are chained together and the lot of them
5385 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5388 grokfield (filename, line, declarator, declspecs, width)
5389 const char *filename ATTRIBUTE_UNUSED;
5390 int line ATTRIBUTE_UNUSED;
5391 tree declarator, declspecs, width;
5395 /* The corresponding pop_obstacks is in finish_decl. */
5396 push_obstacks_nochange ();
5398 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5400 finish_decl (value, NULL_TREE, NULL_TREE);
5401 DECL_INITIAL (value) = width;
5403 maybe_objc_check_decl (value);
5407 /* Function to help qsort sort FIELD_DECLs by name order. */
5410 field_decl_cmp (xp, yp)
5411 const GENERIC_PTR xp;
5412 const GENERIC_PTR yp;
5414 tree *x = (tree *)xp, *y = (tree *)yp;
5416 if (DECL_NAME (*x) == DECL_NAME (*y))
5418 if (DECL_NAME (*x) == NULL)
5420 if (DECL_NAME (*y) == NULL)
5422 if (DECL_NAME (*x) < DECL_NAME (*y))
5427 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5428 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5429 ATTRIBUTES are attributes to be applied to the structure.
5431 We also do a pop_obstacks to match the push in start_struct. */
5434 finish_struct (t, fieldlist, attributes)
5441 int toplevel = global_binding_level == current_binding_level;
5443 /* If this type was previously laid out as a forward reference,
5444 make sure we lay it out again. */
5448 decl_attributes (t, attributes, NULL_TREE);
5450 /* Nameless union parm types are useful as GCC extension. */
5451 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5452 /* Otherwise, warn about any struct or union def. in parmlist. */
5453 if (in_parm_level_p ())
5456 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5457 : "structure defined inside parms"));
5458 else if (! flag_traditional)
5459 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5460 : "structure defined inside parms"));
5463 old_momentary = suspend_momentary ();
5467 for (x = fieldlist; x; x = TREE_CHAIN (x))
5468 if (DECL_NAME (x) != 0)
5473 ? "%s has no named members"
5474 : "%s has no members"),
5475 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5478 /* Install struct as DECL_CONTEXT of each field decl.
5479 Also process specified field sizes.
5480 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5481 The specified size is found in the DECL_INITIAL.
5482 Store 0 there, except for ": 0" fields (so we can find them
5483 and delete them, below). */
5485 for (x = fieldlist; x; x = TREE_CHAIN (x))
5487 DECL_CONTEXT (x) = t;
5488 DECL_PACKED (x) |= TYPE_PACKED (t);
5489 DECL_FIELD_SIZE (x) = 0;
5491 /* If any field is const, the structure type is pseudo-const. */
5492 if (TREE_READONLY (x))
5493 C_TYPE_FIELDS_READONLY (t) = 1;
5496 /* A field that is pseudo-const makes the structure likewise. */
5497 tree t1 = TREE_TYPE (x);
5498 while (TREE_CODE (t1) == ARRAY_TYPE)
5499 t1 = TREE_TYPE (t1);
5500 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5501 && C_TYPE_FIELDS_READONLY (t1))
5502 C_TYPE_FIELDS_READONLY (t) = 1;
5505 /* Any field that is volatile means variables of this type must be
5506 treated in some ways as volatile. */
5507 if (TREE_THIS_VOLATILE (x))
5508 C_TYPE_FIELDS_VOLATILE (t) = 1;
5510 /* Any field of nominal variable size implies structure is too. */
5511 if (C_DECL_VARIABLE_SIZE (x))
5512 C_TYPE_VARIABLE_SIZE (t) = 1;
5514 /* Detect invalid nested redefinition. */
5515 if (TREE_TYPE (x) == t)
5516 error ("nested redefinition of `%s'",
5517 IDENTIFIER_POINTER (TYPE_NAME (t)));
5519 /* Detect invalid bit-field size. */
5520 if (DECL_INITIAL (x))
5521 STRIP_NOPS (DECL_INITIAL (x));
5522 if (DECL_INITIAL (x))
5524 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5525 constant_expression_warning (DECL_INITIAL (x));
5528 error_with_decl (x, "bit-field `%s' width not an integer constant");
5529 DECL_INITIAL (x) = NULL;
5533 /* Detect invalid bit-field type. */
5534 if (DECL_INITIAL (x)
5535 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5536 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5538 error_with_decl (x, "bit-field `%s' has invalid type");
5539 DECL_INITIAL (x) = NULL;
5541 if (DECL_INITIAL (x) && pedantic
5542 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5543 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5544 /* Accept an enum that's equivalent to int or unsigned int. */
5545 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5546 && (TYPE_PRECISION (TREE_TYPE (x))
5547 == TYPE_PRECISION (integer_type_node))))
5548 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5550 /* Detect and ignore out of range field width. */
5551 if (DECL_INITIAL (x))
5553 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5555 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5557 DECL_INITIAL (x) = NULL;
5558 error_with_decl (x, "negative width in bit-field `%s'");
5560 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5561 || width > TYPE_PRECISION (TREE_TYPE (x)))
5563 DECL_INITIAL (x) = NULL;
5564 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5566 else if (width == 0 && DECL_NAME (x) != 0)
5568 error_with_decl (x, "zero width for bit-field `%s'");
5569 DECL_INITIAL (x) = NULL;
5573 /* Process valid field width. */
5574 if (DECL_INITIAL (x))
5576 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5578 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5579 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5580 TREE_UNSIGNED (TREE_TYPE (x)))
5581 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5582 TREE_UNSIGNED (TREE_TYPE (x)))))
5583 warning_with_decl (x, "`%s' is narrower than values of its type");
5585 DECL_FIELD_SIZE (x) = width;
5586 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5587 DECL_INITIAL (x) = NULL;
5591 /* field size 0 => force desired amount of alignment. */
5592 #ifdef EMPTY_FIELD_BOUNDARY
5593 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5595 #ifdef PCC_BITFIELD_TYPE_MATTERS
5596 if (PCC_BITFIELD_TYPE_MATTERS)
5597 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5598 TYPE_ALIGN (TREE_TYPE (x)));
5602 else if (TREE_TYPE (x) != error_mark_node)
5604 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5605 : TYPE_ALIGN (TREE_TYPE (x)));
5606 /* Non-bit-fields are aligned for their type, except packed
5607 fields which require only BITS_PER_UNIT alignment. */
5608 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5612 /* Now DECL_INITIAL is null on all members. */
5614 /* Delete all duplicate fields from the fieldlist */
5615 for (x = fieldlist; x && TREE_CHAIN (x);)
5616 /* Anonymous fields aren't duplicates. */
5617 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5621 register tree y = fieldlist;
5625 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5631 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5633 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5634 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5636 else x = TREE_CHAIN (x);
5639 /* Now we have the nearly final fieldlist. Record it,
5640 then lay out the structure or union (including the fields). */
5642 TYPE_FIELDS (t) = fieldlist;
5646 /* Delete all zero-width bit-fields from the front of the fieldlist */
5648 && DECL_INITIAL (fieldlist))
5649 fieldlist = TREE_CHAIN (fieldlist);
5650 /* Delete all such members from the rest of the fieldlist */
5651 for (x = fieldlist; x;)
5653 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5654 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5655 else x = TREE_CHAIN (x);
5658 /* Now we have the truly final field list.
5659 Store it in this type and in the variants. */
5661 TYPE_FIELDS (t) = fieldlist;
5663 /* If there are lots of fields, sort so we can look through them fast.
5664 We arbitrarily consider 16 or more elts to be "a lot". */
5668 for (x = fieldlist; x; x = TREE_CHAIN (x))
5679 len += list_length (x);
5680 /* Use the same allocation policy here that make_node uses, to
5681 ensure that this lives as long as the rest of the struct decl.
5682 All decls in an inline function need to be saved. */
5683 if (allocation_temporary_p ())
5684 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5686 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5688 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5689 TYPE_LANG_SPECIFIC (t)->len = len;
5691 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5693 for (x = fieldlist; x; x = TREE_CHAIN (x))
5694 field_array[len++] = x;
5696 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5700 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5702 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5703 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5704 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5707 /* If this was supposed to be a transparent union, but we can't
5708 make it one, warn and turn off the flag. */
5709 if (TREE_CODE (t) == UNION_TYPE
5710 && TYPE_TRANSPARENT_UNION (t)
5711 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5713 TYPE_TRANSPARENT_UNION (t) = 0;
5714 warning ("union cannot be made transparent");
5717 /* If this structure or union completes the type of any previous
5718 variable declaration, lay it out and output its rtl. */
5720 if (current_binding_level->n_incomplete != 0)
5723 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5725 if (TREE_TYPE (decl) == t
5726 && TREE_CODE (decl) != TYPE_DECL)
5728 layout_decl (decl, 0);
5729 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5730 maybe_objc_check_decl (decl);
5731 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5734 --current_binding_level->n_incomplete;
5736 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5737 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5739 tree element = TREE_TYPE (decl);
5740 while (TREE_CODE (element) == ARRAY_TYPE)
5741 element = TREE_TYPE (element);
5743 layout_array_type (TREE_TYPE (decl));
5748 resume_momentary (old_momentary);
5750 /* Finish debugging output for this type. */
5751 rest_of_type_compilation (t, toplevel);
5753 /* The matching push is in start_struct. */
5759 /* Lay out the type T, and its element type, and so on. */
5762 layout_array_type (t)
5765 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5766 layout_array_type (TREE_TYPE (t));
5770 /* Begin compiling the definition of an enumeration type.
5771 NAME is its name (or null if anonymous).
5772 Returns the type object, as yet incomplete.
5773 Also records info about it so that build_enumerator
5774 may be used to declare the individual values as they are read. */
5780 register tree enumtype = 0;
5782 /* If this is the real definition for a previous forward reference,
5783 fill in the contents in the same object that used to be the
5784 forward reference. */
5787 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5789 /* The corresponding pop_obstacks is in finish_enum. */
5790 push_obstacks_nochange ();
5791 /* If these symbols and types are global, make them permanent. */
5792 if (current_binding_level == global_binding_level)
5793 end_temporary_allocation ();
5795 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5797 enumtype = make_node (ENUMERAL_TYPE);
5798 pushtag (name, enumtype);
5801 C_TYPE_BEING_DEFINED (enumtype) = 1;
5803 if (TYPE_VALUES (enumtype) != 0)
5805 /* This enum is a named one that has been declared already. */
5806 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5808 /* Completely replace its old definition.
5809 The old enumerators remain defined, however. */
5810 TYPE_VALUES (enumtype) = 0;
5813 enum_next_value = integer_zero_node;
5816 if (flag_short_enums)
5817 TYPE_PACKED (enumtype) = 1;
5822 /* After processing and defining all the values of an enumeration type,
5823 install their decls in the enumeration type and finish it off.
5824 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5825 and ATTRIBUTES are the specified attributes.
5826 Returns ENUMTYPE. */
5829 finish_enum (enumtype, values, attributes)
5834 register tree pair, tem;
5835 tree minnode = 0, maxnode = 0;
5836 int lowprec, highprec, precision;
5837 int toplevel = global_binding_level == current_binding_level;
5839 if (in_parm_level_p ())
5840 warning ("enum defined inside parms");
5842 decl_attributes (enumtype, attributes, NULL_TREE);
5844 /* Calculate the maximum value of any enumerator in this type. */
5846 if (values == error_mark_node)
5847 minnode = maxnode = integer_zero_node;
5849 for (pair = values; pair; pair = TREE_CHAIN (pair))
5851 tree value = TREE_VALUE (pair);
5853 minnode = maxnode = TREE_VALUE (pair);
5856 if (tree_int_cst_lt (maxnode, value))
5858 if (tree_int_cst_lt (value, minnode))
5863 TYPE_MIN_VALUE (enumtype) = minnode;
5864 TYPE_MAX_VALUE (enumtype) = maxnode;
5866 /* An enum can have some negative values; then it is signed. */
5867 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5869 /* Determine the precision this type needs. */
5871 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5872 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5873 precision = MAX (lowprec, highprec);
5875 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5877 tree narrowest = type_for_size (precision, 1);
5880 warning ("enumeration values exceed range of largest integer");
5881 narrowest = long_long_integer_type_node;
5884 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5887 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5889 TYPE_SIZE (enumtype) = 0;
5890 layout_type (enumtype);
5892 if (values != error_mark_node)
5894 /* Change the type of the enumerators to be the enum type.
5895 Formerly this was done only for enums that fit in an int,
5896 but the comment said it was done only for enums wider than int.
5897 It seems necessary to do this for wide enums,
5898 and best not to change what's done for ordinary narrower ones. */
5899 for (pair = values; pair; pair = TREE_CHAIN (pair))
5901 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5902 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5903 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5904 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5907 /* Replace the decl nodes in VALUES with their names. */
5908 for (pair = values; pair; pair = TREE_CHAIN (pair))
5909 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5911 TYPE_VALUES (enumtype) = values;
5914 /* Fix up all variant types of this enum type. */
5915 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5917 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5918 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5919 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5920 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5921 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5922 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5923 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5924 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5925 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5928 /* Finish debugging output for this type. */
5929 rest_of_type_compilation (enumtype, toplevel);
5931 /* This matches a push in start_enum. */
5937 /* Build and install a CONST_DECL for one value of the
5938 current enumeration type (one that was begun with start_enum).
5939 Return a tree-list containing the CONST_DECL and its value.
5940 Assignment of sequential values by default is handled here. */
5943 build_enumerator (name, value)
5946 register tree decl, type;
5948 /* Validate and default VALUE. */
5950 /* Remove no-op casts from the value. */
5952 STRIP_TYPE_NOPS (value);
5956 if (TREE_CODE (value) == INTEGER_CST)
5958 value = default_conversion (value);
5959 constant_expression_warning (value);
5963 error ("enumerator value for `%s' not integer constant",
5964 IDENTIFIER_POINTER (name));
5969 /* Default based on previous value. */
5970 /* It should no longer be possible to have NON_LVALUE_EXPR
5974 value = enum_next_value;
5976 error ("overflow in enumeration values");
5979 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5981 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5982 value = integer_zero_node;
5985 /* Set basis for default for next value. */
5986 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5987 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5989 /* Now create a declaration for the enum value name. */
5991 type = TREE_TYPE (value);
5992 type = type_for_size (MAX (TYPE_PRECISION (type),
5993 TYPE_PRECISION (integer_type_node)),
5995 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5996 && TREE_UNSIGNED (type)));
5998 decl = build_decl (CONST_DECL, name, type);
5999 DECL_INITIAL (decl) = value;
6000 TREE_TYPE (value) = type;
6003 return saveable_tree_cons (decl, value, NULL_TREE);
6006 /* Create the FUNCTION_DECL for a function definition.
6007 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6008 the declaration; they describe the function's name and the type it returns,
6009 but twisted together in a fashion that parallels the syntax of C.
6011 This function creates a binding context for the function body
6012 as well as setting up the FUNCTION_DECL in current_function_decl.
6014 Returns 1 on success. If the DECLARATOR is not suitable for a function
6015 (it defines a datum instead), we return 0, which tells
6016 yyparse to report a parse error.
6018 NESTED is nonzero for a function nested within another function. */
6021 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6022 tree declarator, declspecs, prefix_attributes, attributes;
6025 tree decl1, old_decl;
6027 int old_immediate_size_expand = immediate_size_expand;
6029 current_function_returns_value = 0; /* Assume, until we see it does. */
6030 current_function_returns_null = 0;
6031 warn_about_return_type = 0;
6032 current_extern_inline = 0;
6033 c_function_varargs = 0;
6035 shadowed_labels = 0;
6037 /* Don't expand any sizes in the return type of the function. */
6038 immediate_size_expand = 0;
6040 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6042 /* If the declarator is not suitable for a function definition,
6043 cause a syntax error. */
6046 immediate_size_expand = old_immediate_size_expand;
6050 decl_attributes (decl1, prefix_attributes, attributes);
6052 announce_function (decl1);
6054 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6056 error ("return-type is an incomplete type");
6057 /* Make it return void instead. */
6059 = build_function_type (void_type_node,
6060 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6063 if (warn_about_return_type)
6064 warning ("return-type defaults to `int'");
6066 /* Save the parm names or decls from this function's declarator
6067 where store_parm_decls will find them. */
6068 current_function_parms = last_function_parms;
6069 current_function_parm_tags = last_function_parm_tags;
6071 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6072 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6073 DECL_INITIAL (decl1) = error_mark_node;
6075 /* If this definition isn't a prototype and we had a prototype declaration
6076 before, copy the arg type info from that prototype.
6077 But not if what we had before was a builtin function. */
6078 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6079 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6080 && !DECL_BUILT_IN (old_decl)
6081 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6082 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6083 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6085 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6086 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6087 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6090 /* If there is no explicit declaration, look for any out-of-scope implicit
6093 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6095 /* Optionally warn of old-fashioned def with no previous prototype. */
6096 if (warn_strict_prototypes
6097 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6098 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6099 warning ("function declaration isn't a prototype");
6100 /* Optionally warn of any global def with no previous prototype. */
6101 else if (warn_missing_prototypes
6102 && TREE_PUBLIC (decl1)
6103 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6104 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6105 warning_with_decl (decl1, "no previous prototype for `%s'");
6106 /* Optionally warn of any def with no previous prototype
6107 if the function has already been used. */
6108 else if (warn_missing_prototypes
6109 && old_decl != 0 && TREE_USED (old_decl)
6110 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6111 warning_with_decl (decl1,
6112 "`%s' was used with no prototype before its definition");
6113 /* Optionally warn of any global def with no previous declaration. */
6114 else if (warn_missing_declarations
6115 && TREE_PUBLIC (decl1)
6117 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6118 warning_with_decl (decl1, "no previous declaration for `%s'");
6119 /* Optionally warn of any def with no previous declaration
6120 if the function has already been used. */
6121 else if (warn_missing_declarations
6122 && old_decl != 0 && TREE_USED (old_decl)
6123 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6124 warning_with_decl (decl1,
6125 "`%s' was used with no declaration before its definition");
6127 /* This is a definition, not a reference.
6128 So normally clear DECL_EXTERNAL.
6129 However, `extern inline' acts like a declaration
6130 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6131 DECL_EXTERNAL (decl1) = current_extern_inline;
6133 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6134 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6137 /* This function exists in static storage.
6138 (This does not mean `static' in the C sense!) */
6139 TREE_STATIC (decl1) = 1;
6141 /* A nested function is not global. */
6142 if (current_function_decl != 0)
6143 TREE_PUBLIC (decl1) = 0;
6145 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6147 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6152 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6153 != integer_type_node)
6154 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6156 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6157 args = TREE_CHAIN (args))
6159 tree type = args ? TREE_VALUE (args) : 0;
6161 if (type == void_type_node)
6168 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6169 pedwarn_with_decl (decl1,
6170 "first argument of `%s' should be `int'");
6174 if (TREE_CODE (type) != POINTER_TYPE
6175 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6176 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6178 pedwarn_with_decl (decl1,
6179 "second argument of `%s' should be `char **'");
6183 if (TREE_CODE (type) != POINTER_TYPE
6184 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6185 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6187 pedwarn_with_decl (decl1,
6188 "third argument of `%s' should probably be `char **'");
6193 /* It is intentional that this message does not mention the third
6194 argument, which is warned for only pedantically, because it's
6195 blessed by mention in an appendix of the standard. */
6196 if (argct > 0 && (argct < 2 || argct > 3))
6197 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6199 if (argct == 3 && pedantic)
6200 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6202 if (! TREE_PUBLIC (decl1))
6203 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6206 /* Record the decl so that the function name is defined.
6207 If we already have a decl for this name, and it is a FUNCTION_DECL,
6208 use the old decl. */
6210 current_function_decl = pushdecl (decl1);
6213 declare_parm_level (1);
6214 current_binding_level->subblocks_tag_transparent = 1;
6216 make_function_rtl (current_function_decl);
6218 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6219 /* Promote the value to int before returning it. */
6220 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6222 /* It retains unsignedness if traditional
6223 or if not really getting wider. */
6224 if (TREE_UNSIGNED (restype)
6225 && (flag_traditional
6226 || (TYPE_PRECISION (restype)
6227 == TYPE_PRECISION (integer_type_node))))
6228 restype = unsigned_type_node;
6230 restype = integer_type_node;
6232 DECL_RESULT (current_function_decl)
6233 = build_decl (RESULT_DECL, NULL_TREE, restype);
6236 /* Allocate further tree nodes temporarily during compilation
6237 of this function only. */
6238 temporary_allocation ();
6240 /* If this fcn was already referenced via a block-scope `extern' decl
6241 (or an implicit decl), propagate certain information about the usage. */
6242 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6243 TREE_ADDRESSABLE (current_function_decl) = 1;
6245 immediate_size_expand = old_immediate_size_expand;
6250 /* Record that this function is going to be a varargs function.
6251 This is called before store_parm_decls, which is too early
6252 to call mark_varargs directly. */
6257 c_function_varargs = 1;
6260 /* Store the parameter declarations into the current function declaration.
6261 This is called after parsing the parameter declarations, before
6262 digesting the body of the function.
6264 For an old-style definition, modify the function's type
6265 to specify at least the number of arguments. */
6270 register tree fndecl = current_function_decl;
6273 /* This is either a chain of PARM_DECLs (if a prototype was used)
6274 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6275 tree specparms = current_function_parms;
6277 /* This is a list of types declared among parms in a prototype. */
6278 tree parmtags = current_function_parm_tags;
6280 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6281 register tree parmdecls = getdecls ();
6283 /* This is a chain of any other decls that came in among the parm
6284 declarations. If a parm is declared with enum {foo, bar} x;
6285 then CONST_DECLs for foo and bar are put here. */
6288 /* Nonzero if this definition is written with a prototype. */
6291 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6293 /* This case is when the function was defined with an ANSI prototype.
6294 The parms already have decls, so we need not do anything here
6295 except record them as in effect
6296 and complain if any redundant old-style parm decls were written. */
6307 error_with_decl (fndecl,
6308 "parm types given both in parmlist and separately");
6309 /* Get rid of the erroneous decls; don't keep them on
6310 the list of parms, since they might not be PARM_DECLs. */
6311 for (decl = current_binding_level->names;
6312 decl; decl = TREE_CHAIN (decl))
6313 if (DECL_NAME (decl))
6314 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6315 for (link = current_binding_level->shadowed;
6316 link; link = TREE_CHAIN (link))
6317 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6318 current_binding_level->names = 0;
6319 current_binding_level->shadowed = 0;
6322 specparms = nreverse (specparms);
6323 for (parm = specparms; parm; parm = next)
6325 next = TREE_CHAIN (parm);
6326 if (TREE_CODE (parm) == PARM_DECL)
6328 if (DECL_NAME (parm) == 0)
6329 error_with_decl (parm, "parameter name omitted");
6330 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6332 error_with_decl (parm, "parameter `%s' declared void");
6333 /* Change the type to error_mark_node so this parameter
6334 will be ignored by assign_parms. */
6335 TREE_TYPE (parm) = error_mark_node;
6341 /* If we find an enum constant or a type tag,
6342 put it aside for the moment. */
6343 TREE_CHAIN (parm) = 0;
6344 others = chainon (others, parm);
6348 /* Get the decls in their original chain order
6349 and record in the function. */
6350 DECL_ARGUMENTS (fndecl) = getdecls ();
6353 /* If this function takes a variable number of arguments,
6354 add a phony parameter to the end of the parm list,
6355 to represent the position of the first unnamed argument. */
6356 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6359 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6360 /* Let's hope the address of the unnamed parm
6361 won't depend on its type. */
6362 TREE_TYPE (dummy) = integer_type_node;
6363 DECL_ARG_TYPE (dummy) = integer_type_node;
6364 DECL_ARGUMENTS (fndecl)
6365 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6369 /* Now pushdecl the enum constants. */
6370 for (parm = others; parm; parm = next)
6372 next = TREE_CHAIN (parm);
6373 if (DECL_NAME (parm) == 0)
6375 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6377 else if (TREE_CODE (parm) != PARM_DECL)
6381 storetags (chainon (parmtags, gettags ()));
6385 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6386 each with a parm name as the TREE_VALUE.
6388 PARMDECLS is a chain of declarations for parameters.
6389 Warning! It can also contain CONST_DECLs which are not parameters
6390 but are names of enumerators of any enum types
6391 declared among the parameters.
6393 First match each formal parameter name with its declaration.
6394 Associate decls with the names and store the decls
6395 into the TREE_PURPOSE slots. */
6397 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6398 DECL_RESULT (parm) = 0;
6400 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6402 register tree tail, found = NULL;
6404 if (TREE_VALUE (parm) == 0)
6406 error_with_decl (fndecl, "parameter name missing from parameter list");
6407 TREE_PURPOSE (parm) = 0;
6411 /* See if any of the parmdecls specifies this parm by name.
6412 Ignore any enumerator decls. */
6413 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6414 if (DECL_NAME (tail) == TREE_VALUE (parm)
6415 && TREE_CODE (tail) == PARM_DECL)
6421 /* If declaration already marked, we have a duplicate name.
6422 Complain, and don't use this decl twice. */
6423 if (found && DECL_RESULT (found) != 0)
6425 error_with_decl (found, "multiple parameters named `%s'");
6429 /* If the declaration says "void", complain and ignore it. */
6430 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6432 error_with_decl (found, "parameter `%s' declared void");
6433 TREE_TYPE (found) = integer_type_node;
6434 DECL_ARG_TYPE (found) = integer_type_node;
6435 layout_decl (found, 0);
6438 /* Traditionally, a parm declared float is actually a double. */
6439 if (found && flag_traditional
6440 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6442 TREE_TYPE (found) = double_type_node;
6443 DECL_ARG_TYPE (found) = double_type_node;
6444 layout_decl (found, 0);
6447 /* If no declaration found, default to int. */
6450 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6452 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6453 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6454 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6456 warning_with_decl (found, "type of `%s' defaults to `int'");
6460 TREE_PURPOSE (parm) = found;
6462 /* Mark this decl as "already found" -- see test, above.
6463 It is safe to use DECL_RESULT for this
6464 since it is not used in PARM_DECLs or CONST_DECLs. */
6465 DECL_RESULT (found) = error_mark_node;
6468 /* Put anything which is on the parmdecls chain and which is
6469 not a PARM_DECL onto the list NONPARMS. (The types of
6470 non-parm things which might appear on the list include
6471 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6472 any actual PARM_DECLs not matched with any names. */
6475 for (parm = parmdecls; parm; )
6477 tree next = TREE_CHAIN (parm);
6478 TREE_CHAIN (parm) = 0;
6480 if (TREE_CODE (parm) != PARM_DECL)
6481 nonparms = chainon (nonparms, parm);
6484 /* Complain about args with incomplete types. */
6485 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6487 error_with_decl (parm, "parameter `%s' has incomplete type");
6488 TREE_TYPE (parm) = error_mark_node;
6491 if (DECL_RESULT (parm) == 0)
6493 error_with_decl (parm,
6494 "declaration for parameter `%s' but no such parameter");
6495 /* Pretend the parameter was not missing.
6496 This gets us to a standard state and minimizes
6497 further error messages. */
6499 = chainon (specparms,
6500 tree_cons (parm, NULL_TREE, NULL_TREE));
6507 /* Chain the declarations together in the order of the list of names. */
6508 /* Store that chain in the function decl, replacing the list of names. */
6510 DECL_ARGUMENTS (fndecl) = 0;
6513 for (last = 0; parm; parm = TREE_CHAIN (parm))
6514 if (TREE_PURPOSE (parm))
6517 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6519 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6520 last = TREE_PURPOSE (parm);
6521 TREE_CHAIN (last) = 0;
6525 /* If there was a previous prototype,
6526 set the DECL_ARG_TYPE of each argument according to
6527 the type previously specified, and report any mismatches. */
6529 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6532 for (parm = DECL_ARGUMENTS (fndecl),
6533 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6534 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6535 != void_type_node));
6536 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6538 if (parm == 0 || type == 0
6539 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6541 error ("number of arguments doesn't match prototype");
6542 error_with_file_and_line (current_function_prototype_file,
6543 current_function_prototype_line,
6544 "prototype declaration");
6547 /* Type for passing arg must be consistent
6548 with that declared for the arg. */
6549 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6551 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6552 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6554 /* Adjust argument to match prototype. E.g. a previous
6555 `int foo(float);' prototype causes
6556 `int foo(x) float x; {...}' to be treated like
6557 `int foo(float x) {...}'. This is particularly
6558 useful for argument types like uid_t. */
6559 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6561 if (PROMOTE_PROTOTYPES
6562 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6563 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6564 && TYPE_PRECISION (TREE_TYPE (parm))
6565 < TYPE_PRECISION (integer_type_node))
6566 DECL_ARG_TYPE (parm) = integer_type_node;
6570 pedwarn ("promoted argument `%s' doesn't match prototype",
6571 IDENTIFIER_POINTER (DECL_NAME (parm)));
6572 warning_with_file_and_line
6573 (current_function_prototype_file,
6574 current_function_prototype_line,
6575 "prototype declaration");
6578 /* If -traditional, allow `int' argument to match
6579 `unsigned' prototype. */
6580 else if (! (flag_traditional
6581 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6582 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6584 error ("argument `%s' doesn't match prototype",
6585 IDENTIFIER_POINTER (DECL_NAME (parm)));
6586 error_with_file_and_line (current_function_prototype_file,
6587 current_function_prototype_line,
6588 "prototype declaration");
6592 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6595 /* Otherwise, create a prototype that would match. */
6599 tree actual = 0, last = 0, type;
6601 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6603 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6606 TREE_CHAIN (last) = type;
6611 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6613 TREE_CHAIN (last) = type;
6617 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6618 of the type of this function, but we need to avoid having this
6619 affect the types of other similarly-typed functions, so we must
6620 first force the generation of an identical (but separate) type
6621 node for the relevant function type. The new node we create
6622 will be a variant of the main variant of the original function
6625 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6627 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6630 /* Now store the final chain of decls for the arguments
6631 as the decl-chain of the current lexical scope.
6632 Put the enumerators in as well, at the front so that
6633 DECL_ARGUMENTS is not modified. */
6635 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6638 /* Make sure the binding level for the top of the function body
6639 gets a BLOCK if there are any in the function.
6640 Otherwise, the dbx output is wrong. */
6642 keep_next_if_subblocks = 1;
6644 /* ??? This might be an improvement,
6645 but needs to be thought about some more. */
6647 keep_next_level_flag = 1;
6650 /* Write a record describing this function definition to the prototypes
6651 file (if requested). */
6653 gen_aux_info_record (fndecl, 1, 0, prototype);
6655 /* Initialize the RTL code for the function. */
6657 init_function_start (fndecl, input_filename, lineno);
6659 /* If this is a varargs function, inform function.c. */
6661 if (c_function_varargs)
6664 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6666 declare_function_name ();
6668 /* Set up parameters and prepare for return, for the function. */
6670 expand_function_start (fndecl, 0);
6672 /* If this function is `main', emit a call to `__main'
6673 to run global initializers, etc. */
6674 if (DECL_NAME (fndecl)
6675 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6676 && DECL_CONTEXT (fndecl) == NULL_TREE)
6677 expand_main_function ();
6680 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6681 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6682 stands for an ellipsis in the identifier list.
6684 PARMLIST is the data returned by get_parm_info for the
6685 parmlist that follows the semicolon.
6687 We return a value of the same sort that get_parm_info returns,
6688 except that it describes the combination of identifiers and parmlist. */
6691 combine_parm_decls (specparms, parmlist, void_at_end)
6692 tree specparms, parmlist;
6695 register tree fndecl = current_function_decl;
6698 tree parmdecls = TREE_PURPOSE (parmlist);
6700 /* This is a chain of any other decls that came in among the parm
6701 declarations. They were separated already by get_parm_info,
6702 so we just need to keep them separate. */
6703 tree nonparms = TREE_VALUE (parmlist);
6707 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6708 DECL_RESULT (parm) = 0;
6710 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6712 register tree tail, found = NULL;
6714 /* See if any of the parmdecls specifies this parm by name. */
6715 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6716 if (DECL_NAME (tail) == TREE_VALUE (parm))
6722 /* If declaration already marked, we have a duplicate name.
6723 Complain, and don't use this decl twice. */
6724 if (found && DECL_RESULT (found) != 0)
6726 error_with_decl (found, "multiple parameters named `%s'");
6730 /* If the declaration says "void", complain and ignore it. */
6731 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6733 error_with_decl (found, "parameter `%s' declared void");
6734 TREE_TYPE (found) = integer_type_node;
6735 DECL_ARG_TYPE (found) = integer_type_node;
6736 layout_decl (found, 0);
6739 /* Traditionally, a parm declared float is actually a double. */
6740 if (found && flag_traditional
6741 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6743 TREE_TYPE (found) = double_type_node;
6744 DECL_ARG_TYPE (found) = double_type_node;
6745 layout_decl (found, 0);
6748 /* If no declaration found, default to int. */
6751 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6753 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6754 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6755 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6756 error_with_decl (found, "type of parameter `%s' is not declared");
6760 TREE_PURPOSE (parm) = found;
6762 /* Mark this decl as "already found" -- see test, above.
6763 It is safe to use DECL_RESULT for this
6764 since it is not used in PARM_DECLs or CONST_DECLs. */
6765 DECL_RESULT (found) = error_mark_node;
6768 /* Complain about any actual PARM_DECLs not matched with any names. */
6770 for (parm = parmdecls; parm; )
6772 tree next = TREE_CHAIN (parm);
6773 TREE_CHAIN (parm) = 0;
6775 /* Complain about args with incomplete types. */
6776 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6778 error_with_decl (parm, "parameter `%s' has incomplete type");
6779 TREE_TYPE (parm) = error_mark_node;
6782 if (DECL_RESULT (parm) == 0)
6784 error_with_decl (parm,
6785 "declaration for parameter `%s' but no such parameter");
6786 /* Pretend the parameter was not missing.
6787 This gets us to a standard state and minimizes
6788 further error messages. */
6790 = chainon (specparms,
6791 tree_cons (parm, NULL_TREE, NULL_TREE));
6797 /* Chain the declarations together in the order of the list of names.
6798 At the same time, build up a list of their types, in reverse order. */
6804 for (last = 0; parm; parm = TREE_CHAIN (parm))
6805 if (TREE_PURPOSE (parm))
6808 parmdecls = TREE_PURPOSE (parm);
6810 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6811 last = TREE_PURPOSE (parm);
6812 TREE_CHAIN (last) = 0;
6814 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6819 return saveable_tree_cons (parmdecls, nonparms,
6820 nreverse (saveable_tree_cons (NULL_TREE,
6824 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6827 /* Finish up a function declaration and compile that function
6828 all the way to assembler language output. The free the storage
6829 for the function definition.
6831 This is called after parsing the body of the function definition.
6833 NESTED is nonzero if the function being finished is nested in another. */
6836 finish_function (nested)
6839 register tree fndecl = current_function_decl;
6841 /* TREE_READONLY (fndecl) = 1;
6842 This caused &foo to be of type ptr-to-const-function
6843 which then got a warning when stored in a ptr-to-function variable. */
6846 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6848 /* Must mark the RESULT_DECL as being in this function. */
6850 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6852 /* Obey `register' declarations if `setjmp' is called in this fn. */
6853 if (flag_traditional && current_function_calls_setjmp)
6855 setjmp_protect (DECL_INITIAL (fndecl));
6856 setjmp_protect_args ();
6859 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6861 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6862 != integer_type_node)
6864 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6865 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6867 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6871 #ifdef DEFAULT_MAIN_RETURN
6872 /* Make it so that `main' always returns success by default. */
6873 DEFAULT_MAIN_RETURN;
6878 /* Generate rtl for function exit. */
6879 expand_function_end (input_filename, lineno, 0);
6881 /* So we can tell if jump_optimize sets it to 1. */
6884 /* Run the optimizers and output the assembler code for this function. */
6885 rest_of_compilation (fndecl);
6887 current_function_returns_null |= can_reach_end;
6889 if (warn_missing_noreturn
6890 && !TREE_THIS_VOLATILE (fndecl)
6891 && !current_function_returns_null
6892 && !current_function_returns_value)
6893 warning ("function might be possible candidate for attribute `noreturn'");
6895 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6896 warning ("`noreturn' function does return");
6897 else if (warn_return_type && can_reach_end
6898 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6899 /* If this function returns non-void and control can drop through,
6901 warning ("control reaches end of non-void function");
6902 /* With just -W, complain only if function returns both with
6903 and without a value. */
6904 else if (extra_warnings
6905 && current_function_returns_value && current_function_returns_null)
6906 warning ("this function may return with or without a value");
6908 /* If requested, warn about function definitions where the function will
6909 return a value (usually of some struct or union type) which itself will
6910 take up a lot of stack space. */
6912 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6914 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6918 register tree ret_type_size = TYPE_SIZE (ret_type);
6920 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6923 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6925 if (units > larger_than_size)
6926 warning_with_decl (fndecl,
6927 "size of return value of `%s' is %u bytes",
6933 /* Free all the tree nodes making up this function. */
6934 /* Switch back to allocating nodes permanently
6935 until we start another function. */
6937 permanent_allocation (1);
6939 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6941 /* Stop pointing to the local nodes about to be freed. */
6942 /* But DECL_INITIAL must remain nonzero so we know this
6943 was an actual function definition. */
6944 /* For a nested function, this is done in pop_c_function_context. */
6945 /* If rest_of_compilation set this to 0, leave it 0. */
6946 if (DECL_INITIAL (fndecl) != 0)
6947 DECL_INITIAL (fndecl) = error_mark_node;
6948 DECL_ARGUMENTS (fndecl) = 0;
6951 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6953 #ifndef ASM_OUTPUT_CONSTRUCTOR
6954 if (! flag_gnu_linker)
6955 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6958 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6960 if (DECL_STATIC_DESTRUCTOR (fndecl))
6962 #ifndef ASM_OUTPUT_DESTRUCTOR
6963 if (! flag_gnu_linker)
6964 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6967 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6972 /* Let the error reporting routines know that we're outside a
6973 function. For a nested function, this value is used in
6974 pop_c_function_context and then reset via pop_function_context. */
6975 current_function_decl = NULL;
6979 /* Save and restore the variables in this file and elsewhere
6980 that keep track of the progress of compilation of the current function.
6981 Used for nested functions. */
6985 struct c_function *next;
6987 tree shadowed_labels;
6990 int warn_about_return_type;
6992 struct binding_level *binding_level;
6995 struct c_function *c_function_chain;
6997 /* Save and reinitialize the variables
6998 used during compilation of a C function. */
7001 push_c_function_context ()
7003 struct c_function *p
7004 = (struct c_function *) xmalloc (sizeof (struct c_function));
7007 pedwarn ("ANSI C forbids nested functions");
7009 push_function_context ();
7011 p->next = c_function_chain;
7012 c_function_chain = p;
7014 p->named_labels = named_labels;
7015 p->shadowed_labels = shadowed_labels;
7016 p->returns_value = current_function_returns_value;
7017 p->returns_null = current_function_returns_null;
7018 p->warn_about_return_type = warn_about_return_type;
7019 p->extern_inline = current_extern_inline;
7020 p->binding_level = current_binding_level;
7023 /* Restore the variables used during compilation of a C function. */
7026 pop_c_function_context ()
7028 struct c_function *p = c_function_chain;
7031 /* Bring back all the labels that were shadowed. */
7032 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7033 if (DECL_NAME (TREE_VALUE (link)) != 0)
7034 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7035 = TREE_VALUE (link);
7037 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7039 /* Stop pointing to the local nodes about to be freed. */
7040 /* But DECL_INITIAL must remain nonzero so we know this
7041 was an actual function definition. */
7042 DECL_INITIAL (current_function_decl) = error_mark_node;
7043 DECL_ARGUMENTS (current_function_decl) = 0;
7046 pop_function_context ();
7048 c_function_chain = p->next;
7050 named_labels = p->named_labels;
7051 shadowed_labels = p->shadowed_labels;
7052 current_function_returns_value = p->returns_value;
7053 current_function_returns_null = p->returns_null;
7054 warn_about_return_type = p->warn_about_return_type;
7055 current_extern_inline = p->extern_inline;
7056 current_binding_level = p->binding_level;
7061 /* integrate_decl_tree calls this function, but since we don't use the
7062 DECL_LANG_SPECIFIC field, this is a no-op. */
7065 copy_lang_decl (node)
7066 tree node ATTRIBUTE_UNUSED;