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. */
43 extern cpp_reader parse_in;
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL, /* Ordinary declaration */
49 FUNCDEF, /* Function definition */
50 PARM, /* Declaration of parm before function body */
51 FIELD, /* Declaration inside struct or union */
52 BITFIELD, /* Likewise but with specified width */
53 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* We let tm.h override the types used here, to handle trivial differences
56 such as the choice of unsigned int or long unsigned int for size_t.
57 When machines start needing nontrivial differences in the size type,
58 it would be best to do something here to figure out automatically
59 from other information what type to use. */
62 #define SIZE_TYPE "long unsigned int"
66 #define PTRDIFF_TYPE "long int"
70 #define WCHAR_TYPE "int"
76 /* Nonzero if we have seen an invalid cross reference
77 to a struct, union, or enum, but not yet printed the message. */
79 tree pending_invalid_xref;
80 /* File and line to appear in the eventual error message. */
81 char *pending_invalid_xref_file;
82 int pending_invalid_xref_line;
84 /* While defining an enum type, this is 1 plus the last enumerator
85 constant value. Note that will do not have to save this or `enum_overflow'
86 around nested function definition since such a definition could only
87 occur in an enum value expression and we don't use these variables in
90 static tree enum_next_value;
92 /* Nonzero means that there was overflow computing enum_next_value. */
94 static int enum_overflow;
96 /* Parsing a function declarator leaves a list of parameter names
97 or a chain or parameter decls here. */
99 static tree last_function_parms;
101 /* Parsing a function declarator leaves here a chain of structure
102 and enum types declared in the parmlist. */
104 static tree last_function_parm_tags;
106 /* After parsing the declarator that starts a function definition,
107 `start_function' puts here the list of parameter names or chain of decls.
108 `store_parm_decls' finds it here. */
110 static tree current_function_parms;
112 /* Similar, for last_function_parm_tags. */
113 static tree current_function_parm_tags;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
117 static char *current_function_prototype_file;
118 static int current_function_prototype_line;
120 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
121 that have names. Here so we can clear out their names' definitions
122 at the end of the function. */
124 static tree named_labels;
126 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
128 static tree shadowed_labels;
130 /* Nonzero when store_parm_decls is called indicates a varargs function.
131 Value not meaningful after store_parm_decls. */
133 static int c_function_varargs;
135 /* The FUNCTION_DECL for the function currently being compiled,
136 or 0 if between functions. */
137 tree current_function_decl;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a return statement that specifies a return value is seen. */
142 int current_function_returns_value;
144 /* Set to 0 at beginning of a function definition, set to 1 if
145 a return statement with no argument is seen. */
147 int current_function_returns_null;
149 /* Set to nonzero by `grokdeclarator' for a function
150 whose return type is defaulted, if warnings for this are desired. */
152 static int warn_about_return_type;
154 /* Nonzero when starting a function declared `extern inline'. */
156 static int current_extern_inline;
158 /* For each binding contour we allocate a binding_level structure
159 * which records the names defined in that contour.
162 * 1) one for each function definition,
163 * where internal declarations of the parameters appear.
164 * 2) one for each compound statement,
165 * to record its declarations.
167 * The current meaning of a name can be found by searching the levels from
168 * the current one out to the global one.
171 /* Note that the information in the `names' component of the global contour
172 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
176 /* A chain of _DECL nodes for all variables, constants, functions,
177 and typedef types. These are in the reverse of the order supplied.
181 /* A list of structure, union and enum definitions,
182 * for looking up tag names.
183 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
184 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
185 * or ENUMERAL_TYPE node.
189 /* For each level, a list of shadowed outer-level local definitions
190 to be restored when this level is popped.
191 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
192 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
195 /* For each level (except not the global one),
196 a chain of BLOCK nodes for all the levels
197 that were entered and exited one level down. */
200 /* The BLOCK node for this level, if one has been preallocated.
201 If 0, the BLOCK is allocated (if needed) when the level is popped. */
204 /* The binding level which this one is contained in (inherits from). */
205 struct binding_level *level_chain;
207 /* Nonzero for the level that holds the parameters of a function. */
210 /* Nonzero if this level "doesn't exist" for tags. */
211 char tag_transparent;
213 /* Nonzero if sublevels of this level "don't exist" for tags.
214 This is set in the parm level of a function definition
215 while reading the function body, so that the outermost block
216 of the function body will be tag-transparent. */
217 char subblocks_tag_transparent;
219 /* Nonzero means make a BLOCK for this level regardless of all else. */
222 /* Nonzero means make a BLOCK if this level has any subblocks. */
223 char keep_if_subblocks;
225 /* Number of decls in `names' that have incomplete
226 structure or union types. */
229 /* A list of decls giving the (reversed) specified order of parms,
230 not including any forward-decls in the parmlist.
231 This is so we can put the parms in proper order for assign_parms. */
235 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
237 /* The binding level currently in effect. */
239 static struct binding_level *current_binding_level;
241 /* A chain of binding_level structures awaiting reuse. */
243 static struct binding_level *free_binding_level;
245 /* The outermost binding level, for names of file scope.
246 This is created when the compiler is started and exists
247 through the entire run. */
249 static struct binding_level *global_binding_level;
251 /* Binding level structures are initialized by copying this one. */
253 static struct binding_level clear_binding_level
254 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
257 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
259 static int keep_next_level_flag;
261 /* Nonzero means make a BLOCK for the next level pushed
262 if it has subblocks. */
264 static int keep_next_if_subblocks;
266 /* The chain of outer levels of label scopes.
267 This uses the same data structure used for binding levels,
268 but it works differently: each link in the chain records
269 saved values of named_labels and shadowed_labels for
270 a label binding level outside the current one. */
272 static struct binding_level *label_level_chain;
274 /* Functions called automatically at the beginning and end of execution. */
276 tree static_ctors, static_dtors;
278 /* Forward declarations. */
280 static struct binding_level * make_binding_level PROTO((void));
281 static void mark_binding_level PROTO((void *));
282 static void clear_limbo_values PROTO((tree));
283 static int duplicate_decls PROTO((tree, tree, int));
284 static int redeclaration_error_message PROTO((tree, tree));
285 static void storedecls PROTO((tree));
286 static void storetags PROTO((tree));
287 static tree lookup_tag PROTO((enum tree_code, tree,
288 struct binding_level *, int));
289 static tree lookup_tag_reverse PROTO((tree));
290 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
292 static tree grokparms PROTO((tree, int));
293 static int field_decl_cmp PROTO((const PTR, const PTR));
294 static void layout_array_type PROTO((tree));
296 /* C-specific option variables. */
298 /* Nonzero means allow type mismatches in conditional expressions;
299 just make their values `void'. */
301 int flag_cond_mismatch;
303 /* Nonzero means give `double' the same size as `float'. */
305 int flag_short_double;
307 /* Nonzero means give `wchar_t' the same size as `short'. */
309 int flag_short_wchar;
311 /* Nonzero means don't recognize the keyword `asm'. */
315 /* Nonzero means don't recognize any builtin functions. */
319 /* Nonzero means don't recognize the non-ANSI builtin functions.
322 int flag_no_nonansi_builtin;
324 /* Nonzero means do some things the same way PCC does. */
326 int flag_traditional;
328 /* Nonzero means use the ISO C9x dialect of C. */
332 /* Nonzero means that we have builtin functions, and main is an int */
336 /* Nonzero means to allow single precision math even if we're generally
337 being traditional. */
338 int flag_allow_single_precision = 0;
340 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
342 int flag_signed_bitfields = 1;
343 int explicit_flag_signed_bitfields = 0;
345 /* Nonzero means warn about use of implicit int. */
347 int warn_implicit_int;
349 /* Nonzero means warn about usage of long long when `-pedantic'. */
351 int warn_long_long = 1;
353 /* Nonzero means message about use of implicit function declarations;
354 1 means warning; 2 means error. */
356 int mesg_implicit_function_declaration;
358 /* Nonzero means give string constants the type `const char *'
359 to get extra warnings from them. These warnings will be too numerous
360 to be useful, except in thoroughly ANSIfied programs. */
362 int flag_const_strings;
364 /* Nonzero means warn about pointer casts that can drop a type qualifier
365 from the pointer target type. */
369 /* Nonzero means warn when casting a function call to a type that does
370 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
371 when there is no previous declaration of sqrt or malloc. */
373 int warn_bad_function_cast;
375 /* Warn about functions which might be candidates for attribute noreturn. */
377 int warn_missing_noreturn;
379 /* Warn about traditional constructs whose meanings changed in ANSI C. */
381 int warn_traditional;
383 /* Nonzero means warn about sizeof(function) or addition/subtraction
384 of function pointers. */
386 int warn_pointer_arith;
388 /* Nonzero means warn for non-prototype function decls
389 or non-prototyped defs without previous prototype. */
391 int warn_strict_prototypes;
393 /* Nonzero means warn for any global function def
394 without separate previous prototype decl. */
396 int warn_missing_prototypes;
398 /* Nonzero means warn for any global function def
399 without separate previous decl. */
401 int warn_missing_declarations;
403 /* Nonzero means warn about multiple (redundant) decls for the same single
404 variable or function. */
406 int warn_redundant_decls = 0;
408 /* Nonzero means warn about extern declarations of objects not at
409 file-scope level and about *all* declarations of functions (whether
410 extern or static) not at file-scope level. Note that we exclude
411 implicit function declarations. To get warnings about those, use
414 int warn_nested_externs = 0;
416 /* Warn about *printf or *scanf format/argument anomalies. */
420 /* Warn about a subscript that has type char. */
422 int warn_char_subscripts = 0;
424 /* Warn if a type conversion is done that might have confusing results. */
428 /* Warn if adding () is suggested. */
430 int warn_parentheses;
432 /* Warn if initializer is not completely bracketed. */
434 int warn_missing_braces;
436 /* Warn if main is suspicious. */
440 /* Warn about #pragma directives that are not recognised. */
442 int warn_unknown_pragmas = 0; /* Tri state variable. */
444 /* Warn about comparison of signed and unsigned values.
445 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
447 int warn_sign_compare = -1;
449 /* Nonzero means warn about use of multicharacter literals. */
451 int warn_multichar = 1;
453 /* Nonzero means `$' can be in an identifier. */
455 #ifndef DOLLARS_IN_IDENTIFIERS
456 #define DOLLARS_IN_IDENTIFIERS 1
458 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
460 /* Decode the string P as a language-specific option for C.
461 Return the number of strings consumed. Should not complain
462 if it does not recognise the option. */
465 c_decode_option (argc, argv)
466 int argc ATTRIBUTE_UNUSED;
469 int strings_processed;
472 strings_processed = cpp_handle_option (&parse_in, argc, argv);
474 strings_processed = 0;
475 #endif /* ! USE_CPPLIB */
477 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
479 flag_traditional = 1;
480 flag_writable_strings = 1;
482 else if (!strcmp (p, "-fallow-single-precision"))
483 flag_allow_single_precision = 1;
484 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
489 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
493 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
497 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
499 flag_traditional = 0;
500 flag_writable_strings = 0;
502 else if (!strncmp (p, "-std=", 5))
504 /* Select the appropriate language standard. We currently
506 -std=iso9899:1990 same as -ansi
507 -std=iso9899:199409 ISO C as modified in amend. 1
508 -std=iso9899:199x ISO C 9x
509 -std=c89 same as -std=iso9899:1990
510 -std=c9x same as -std=iso9899:199x
511 -std=gnu89 default, iso9899:1990 + gnu extensions
512 -std=gnu9x iso9899:199x + gnu extensions
514 const char *argstart = &p[5];
516 if (!strcmp (argstart, "iso9899:1990")
517 || !strcmp (argstart, "c89"))
520 flag_traditional = 0;
521 flag_writable_strings = 0;
523 flag_no_nonansi_builtin = 1;
526 else if (!strcmp (argstart, "iso9899:199409"))
528 /* ??? The changes since ISO C 1990 are not supported. */
531 else if (!strcmp (argstart, "iso9899:199x")
532 || !strcmp (argstart, "c9x"))
534 flag_traditional = 0;
535 flag_writable_strings = 0;
537 flag_no_nonansi_builtin = 1;
540 else if (!strcmp (argstart, "gnu89"))
542 flag_traditional = 0;
543 flag_writable_strings = 0;
545 flag_no_nonansi_builtin = 0;
548 else if (!strcmp (argstart, "gnu9x"))
550 flag_traditional = 0;
551 flag_writable_strings = 0;
553 flag_no_nonansi_builtin = 0;
557 error ("unknown C standard `%s'", argstart);
559 else if (!strcmp (p, "-fdollars-in-identifiers"))
560 dollars_in_ident = 1;
561 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
562 dollars_in_ident = 0;
563 else if (!strcmp (p, "-fsigned-char"))
564 flag_signed_char = 1;
565 else if (!strcmp (p, "-funsigned-char"))
566 flag_signed_char = 0;
567 else if (!strcmp (p, "-fno-signed-char"))
568 flag_signed_char = 0;
569 else if (!strcmp (p, "-fno-unsigned-char"))
570 flag_signed_char = 1;
571 else if (!strcmp (p, "-fsigned-bitfields")
572 || !strcmp (p, "-fno-unsigned-bitfields"))
574 flag_signed_bitfields = 1;
575 explicit_flag_signed_bitfields = 1;
577 else if (!strcmp (p, "-funsigned-bitfields")
578 || !strcmp (p, "-fno-signed-bitfields"))
580 flag_signed_bitfields = 0;
581 explicit_flag_signed_bitfields = 1;
583 else if (!strcmp (p, "-fshort-enums"))
584 flag_short_enums = 1;
585 else if (!strcmp (p, "-fno-short-enums"))
586 flag_short_enums = 0;
587 else if (!strcmp (p, "-fshort-wchar"))
588 flag_short_wchar = 1;
589 else if (!strcmp (p, "-fno-short-wchar"))
590 flag_short_wchar = 0;
591 else if (!strcmp (p, "-fcond-mismatch"))
592 flag_cond_mismatch = 1;
593 else if (!strcmp (p, "-fno-cond-mismatch"))
594 flag_cond_mismatch = 0;
595 else if (!strcmp (p, "-fshort-double"))
596 flag_short_double = 1;
597 else if (!strcmp (p, "-fno-short-double"))
598 flag_short_double = 0;
599 else if (!strcmp (p, "-fasm"))
601 else if (!strcmp (p, "-fno-asm"))
603 else if (!strcmp (p, "-fbuiltin"))
605 else if (!strcmp (p, "-fno-builtin"))
607 else if (!strcmp (p, "-ansi"))
609 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
610 mesg_implicit_function_declaration = 2;
611 else if (!strcmp (p, "-Wimplicit-function-declaration"))
612 mesg_implicit_function_declaration = 1;
613 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
614 mesg_implicit_function_declaration = 0;
615 else if (!strcmp (p, "-Wimplicit-int"))
616 warn_implicit_int = 1;
617 else if (!strcmp (p, "-Wno-implicit-int"))
618 warn_implicit_int = 0;
619 else if (!strcmp (p, "-Wimplicit"))
621 warn_implicit_int = 1;
622 if (mesg_implicit_function_declaration != 2)
623 mesg_implicit_function_declaration = 1;
625 else if (!strcmp (p, "-Wno-implicit"))
626 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
627 else if (!strcmp (p, "-Wlong-long"))
629 else if (!strcmp (p, "-Wno-long-long"))
631 else if (!strcmp (p, "-Wwrite-strings"))
632 flag_const_strings = 1;
633 else if (!strcmp (p, "-Wno-write-strings"))
634 flag_const_strings = 0;
635 else if (!strcmp (p, "-Wcast-qual"))
637 else if (!strcmp (p, "-Wno-cast-qual"))
639 else if (!strcmp (p, "-Wbad-function-cast"))
640 warn_bad_function_cast = 1;
641 else if (!strcmp (p, "-Wno-bad-function-cast"))
642 warn_bad_function_cast = 0;
643 else if (!strcmp (p, "-Wmissing-noreturn"))
644 warn_missing_noreturn = 1;
645 else if (!strcmp (p, "-Wno-missing-noreturn"))
646 warn_missing_noreturn = 0;
647 else if (!strcmp (p, "-Wpointer-arith"))
648 warn_pointer_arith = 1;
649 else if (!strcmp (p, "-Wno-pointer-arith"))
650 warn_pointer_arith = 0;
651 else if (!strcmp (p, "-Wstrict-prototypes"))
652 warn_strict_prototypes = 1;
653 else if (!strcmp (p, "-Wno-strict-prototypes"))
654 warn_strict_prototypes = 0;
655 else if (!strcmp (p, "-Wmissing-prototypes"))
656 warn_missing_prototypes = 1;
657 else if (!strcmp (p, "-Wno-missing-prototypes"))
658 warn_missing_prototypes = 0;
659 else if (!strcmp (p, "-Wmissing-declarations"))
660 warn_missing_declarations = 1;
661 else if (!strcmp (p, "-Wno-missing-declarations"))
662 warn_missing_declarations = 0;
663 else if (!strcmp (p, "-Wredundant-decls"))
664 warn_redundant_decls = 1;
665 else if (!strcmp (p, "-Wno-redundant-decls"))
666 warn_redundant_decls = 0;
667 else if (!strcmp (p, "-Wnested-externs"))
668 warn_nested_externs = 1;
669 else if (!strcmp (p, "-Wno-nested-externs"))
670 warn_nested_externs = 0;
671 else if (!strcmp (p, "-Wtraditional"))
672 warn_traditional = 1;
673 else if (!strcmp (p, "-Wno-traditional"))
674 warn_traditional = 0;
675 else if (!strcmp (p, "-Wformat"))
677 else if (!strcmp (p, "-Wno-format"))
679 else if (!strcmp (p, "-Wchar-subscripts"))
680 warn_char_subscripts = 1;
681 else if (!strcmp (p, "-Wno-char-subscripts"))
682 warn_char_subscripts = 0;
683 else if (!strcmp (p, "-Wconversion"))
685 else if (!strcmp (p, "-Wno-conversion"))
687 else if (!strcmp (p, "-Wparentheses"))
688 warn_parentheses = 1;
689 else if (!strcmp (p, "-Wno-parentheses"))
690 warn_parentheses = 0;
691 else if (!strcmp (p, "-Wreturn-type"))
692 warn_return_type = 1;
693 else if (!strcmp (p, "-Wno-return-type"))
694 warn_return_type = 0;
695 else if (!strcmp (p, "-Wcomment"))
696 ; /* cpp handles this one. */
697 else if (!strcmp (p, "-Wno-comment"))
698 ; /* cpp handles this one. */
699 else if (!strcmp (p, "-Wcomments"))
700 ; /* cpp handles this one. */
701 else if (!strcmp (p, "-Wno-comments"))
702 ; /* cpp handles this one. */
703 else if (!strcmp (p, "-Wtrigraphs"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p, "-Wno-trigraphs"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p, "-Wundef"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p, "-Wno-undef"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p, "-Wimport"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wno-import"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wmissing-braces"))
716 warn_missing_braces = 1;
717 else if (!strcmp (p, "-Wno-missing-braces"))
718 warn_missing_braces = 0;
719 else if (!strcmp (p, "-Wmain"))
721 else if (!strcmp (p, "-Wno-main"))
723 else if (!strcmp (p, "-Wsign-compare"))
724 warn_sign_compare = 1;
725 else if (!strcmp (p, "-Wno-sign-compare"))
726 warn_sign_compare = 0;
727 else if (!strcmp (p, "-Wmultichar"))
729 else if (!strcmp (p, "-Wno-multichar"))
731 else if (!strcmp (p, "-Wunknown-pragmas"))
732 /* Set to greater than 1, so that even unknown pragmas in system
733 headers will be warned about. */
734 warn_unknown_pragmas = 2;
735 else if (!strcmp (p, "-Wno-unknown-pragmas"))
736 warn_unknown_pragmas = 0;
737 else if (!strcmp (p, "-Wall"))
739 /* We save the value of warn_uninitialized, since if they put
740 -Wuninitialized on the command line, we need to generate a
741 warning about not using it without also specifying -O. */
742 if (warn_uninitialized != 1)
743 warn_uninitialized = 2;
744 warn_implicit_int = 1;
745 mesg_implicit_function_declaration = 1;
746 warn_return_type = 1;
750 warn_char_subscripts = 1;
751 warn_parentheses = 1;
752 warn_missing_braces = 1;
753 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
754 it off only if it's not explicit. */
756 /* Only warn about unknown pragmas that are not in system headers. */
757 warn_unknown_pragmas = 1;
760 return strings_processed;
765 /* Hooks for print_node. */
768 print_lang_decl (file, node, indent)
769 FILE *file ATTRIBUTE_UNUSED;
770 tree node ATTRIBUTE_UNUSED;
771 int indent ATTRIBUTE_UNUSED;
776 print_lang_type (file, node, indent)
777 FILE *file ATTRIBUTE_UNUSED;
778 tree node ATTRIBUTE_UNUSED;
779 int indent ATTRIBUTE_UNUSED;
784 print_lang_identifier (file, node, indent)
789 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
790 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
791 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
792 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
793 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
794 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
797 /* Hook called at end of compilation to assume 1 elt
798 for a top-level array decl that wasn't complete before. */
801 finish_incomplete_decl (decl)
804 if (TREE_CODE (decl) == VAR_DECL)
806 tree type = TREE_TYPE (decl);
807 if (type != error_mark_node
808 && TREE_CODE (type) == ARRAY_TYPE
809 && TYPE_DOMAIN (type) == 0)
811 if (! DECL_EXTERNAL (decl))
812 warning_with_decl (decl, "array `%s' assumed to have one element");
814 complete_array_type (type, NULL_TREE, 1);
816 layout_decl (decl, 0);
821 /* Create a new `struct binding_level'. */
824 struct binding_level *
825 make_binding_level ()
828 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
831 /* Nonzero if we are currently in the global binding level. */
836 return current_binding_level == global_binding_level;
842 keep_next_level_flag = 1;
845 /* Nonzero if the current level needs to have a BLOCK made. */
850 return ((current_binding_level->keep_if_subblocks
851 && current_binding_level->blocks != 0)
852 || current_binding_level->keep
853 || current_binding_level->names != 0
854 || (current_binding_level->tags != 0
855 && !current_binding_level->tag_transparent));
858 /* Identify this binding level as a level of parameters.
859 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
860 But it turns out there is no way to pass the right value for
861 DEFINITION_FLAG, so we ignore it. */
864 declare_parm_level (definition_flag)
865 int definition_flag ATTRIBUTE_UNUSED;
867 current_binding_level->parm_flag = 1;
870 /* Nonzero if currently making parm declarations. */
875 return current_binding_level->parm_flag;
878 /* Enter a new binding level.
879 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
880 not for that of tags. */
883 pushlevel (tag_transparent)
886 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
888 /* If this is the top level of a function,
889 just make sure that NAMED_LABELS is 0. */
891 if (current_binding_level == global_binding_level)
896 /* Reuse or create a struct for this binding level. */
898 if (free_binding_level)
900 newlevel = free_binding_level;
901 free_binding_level = free_binding_level->level_chain;
905 newlevel = make_binding_level ();
908 /* Add this level to the front of the chain (stack) of levels that
911 *newlevel = clear_binding_level;
912 newlevel->tag_transparent
914 || (current_binding_level
915 ? current_binding_level->subblocks_tag_transparent
917 newlevel->level_chain = current_binding_level;
918 current_binding_level = newlevel;
919 newlevel->keep = keep_next_level_flag;
920 keep_next_level_flag = 0;
921 newlevel->keep_if_subblocks = keep_next_if_subblocks;
922 keep_next_if_subblocks = 0;
925 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
928 clear_limbo_values (block)
933 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
934 if (DECL_NAME (tem) != 0)
935 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
937 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
938 clear_limbo_values (tem);
941 /* Exit a binding level.
942 Pop the level off, and restore the state of the identifier-decl mappings
943 that were in effect when this level was entered.
945 If KEEP is nonzero, this level had explicit declarations, so
946 and create a "block" (a BLOCK node) for the level
947 to record its declarations and subblocks for symbol table output.
949 If FUNCTIONBODY is nonzero, this level is the body of a function,
950 so create a block as if KEEP were set and also clear out all
953 If REVERSE is nonzero, reverse the order of decls before putting
954 them into the BLOCK. */
957 poplevel (keep, reverse, functionbody)
963 /* The chain of decls was accumulated in reverse order.
964 Put it into forward order, just for cleanliness. */
966 tree tags = current_binding_level->tags;
967 tree subblocks = current_binding_level->blocks;
970 int block_previously_created;
972 keep |= current_binding_level->keep;
974 /* This warning is turned off because it causes warnings for
975 declarations like `extern struct foo *x'. */
977 /* Warn about incomplete structure types in this level. */
978 for (link = tags; link; link = TREE_CHAIN (link))
979 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
981 tree type = TREE_VALUE (link);
982 tree type_name = TYPE_NAME (type);
983 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
985 : DECL_NAME (type_name));
986 switch (TREE_CODE (type))
989 error ("`struct %s' incomplete in scope ending here", id);
992 error ("`union %s' incomplete in scope ending here", id);
995 error ("`enum %s' incomplete in scope ending here", id);
1001 /* Get the decls in the order they were written.
1002 Usually current_binding_level->names is in reverse order.
1003 But parameter decls were previously put in forward order. */
1006 current_binding_level->names
1007 = decls = nreverse (current_binding_level->names);
1009 decls = current_binding_level->names;
1011 /* Output any nested inline functions within this block
1012 if they weren't already output. */
1014 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1015 if (TREE_CODE (decl) == FUNCTION_DECL
1016 && ! TREE_ASM_WRITTEN (decl)
1017 && DECL_INITIAL (decl) != 0
1018 && TREE_ADDRESSABLE (decl))
1020 /* If this decl was copied from a file-scope decl
1021 on account of a block-scope extern decl,
1022 propagate TREE_ADDRESSABLE to the file-scope decl.
1024 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1025 true, since then the decl goes through save_for_inline_copying. */
1026 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1027 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1028 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1029 else if (DECL_SAVED_INSNS (decl) != 0)
1031 push_function_context ();
1032 output_inline_function (decl);
1033 pop_function_context ();
1037 /* If there were any declarations or structure tags in that level,
1038 or if this level is a function body,
1039 create a BLOCK to record them for the life of this function. */
1042 block_previously_created = (current_binding_level->this_block != 0);
1043 if (block_previously_created)
1044 block = current_binding_level->this_block;
1045 else if (keep || functionbody
1046 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1047 block = make_node (BLOCK);
1050 BLOCK_VARS (block) = decls;
1051 BLOCK_TYPE_TAGS (block) = tags;
1052 BLOCK_SUBBLOCKS (block) = subblocks;
1053 remember_end_note (block);
1056 /* In each subblock, record that this is its superior. */
1058 for (link = subblocks; link; link = TREE_CHAIN (link))
1059 BLOCK_SUPERCONTEXT (link) = block;
1061 /* Clear out the meanings of the local variables of this level. */
1063 for (link = decls; link; link = TREE_CHAIN (link))
1065 if (DECL_NAME (link) != 0)
1067 /* If the ident. was used or addressed via a local extern decl,
1068 don't forget that fact. */
1069 if (DECL_EXTERNAL (link))
1071 if (TREE_USED (link))
1072 TREE_USED (DECL_NAME (link)) = 1;
1073 if (TREE_ADDRESSABLE (link))
1074 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1076 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1080 /* Restore all name-meanings of the outer levels
1081 that were shadowed by this level. */
1083 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1084 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1086 /* If the level being exited is the top level of a function,
1087 check over all the labels, and clear out the current
1088 (function local) meanings of their names. */
1092 clear_limbo_values (block);
1094 /* If this is the top level block of a function,
1095 the vars are the function's parameters.
1096 Don't leave them in the BLOCK because they are
1097 found in the FUNCTION_DECL instead. */
1099 BLOCK_VARS (block) = 0;
1101 /* Clear out the definitions of all label names,
1102 since their scopes end here,
1103 and add them to BLOCK_VARS. */
1105 for (link = named_labels; link; link = TREE_CHAIN (link))
1107 register tree label = TREE_VALUE (link);
1109 if (DECL_INITIAL (label) == 0)
1111 error_with_decl (label, "label `%s' used but not defined");
1112 /* Avoid crashing later. */
1113 define_label (input_filename, lineno,
1116 else if (warn_unused && !TREE_USED (label))
1117 warning_with_decl (label, "label `%s' defined but not used");
1118 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1120 /* Put the labels into the "variables" of the
1121 top-level block, so debugger can see them. */
1122 TREE_CHAIN (label) = BLOCK_VARS (block);
1123 BLOCK_VARS (block) = label;
1127 /* Pop the current level, and free the structure for reuse. */
1130 register struct binding_level *level = current_binding_level;
1131 current_binding_level = current_binding_level->level_chain;
1133 level->level_chain = free_binding_level;
1134 free_binding_level = level;
1137 /* Dispose of the block that we just made inside some higher level. */
1139 DECL_INITIAL (current_function_decl) = block;
1142 if (!block_previously_created)
1143 current_binding_level->blocks
1144 = chainon (current_binding_level->blocks, block);
1146 /* If we did not make a block for the level just exited,
1147 any blocks made for inner levels
1148 (since they cannot be recorded as subblocks in that level)
1149 must be carried forward so they will later become subblocks
1150 of something else. */
1152 current_binding_level->blocks
1153 = chainon (current_binding_level->blocks, subblocks);
1155 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1156 binding contour so that they point to the appropriate construct, i.e.
1157 either to the current FUNCTION_DECL node, or else to the BLOCK node
1158 we just constructed.
1160 Note that for tagged types whose scope is just the formal parameter
1161 list for some function type specification, we can't properly set
1162 their TYPE_CONTEXTs here, because we don't have a pointer to the
1163 appropriate FUNCTION_TYPE node readily available to us. For those
1164 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1165 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1166 node which will represent the "scope" for these "parameter list local"
1171 for (link = tags; link; link = TREE_CHAIN (link))
1172 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1174 for (link = tags; link; link = TREE_CHAIN (link))
1175 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1178 TREE_USED (block) = 1;
1182 /* Delete the node BLOCK from the current binding level.
1183 This is used for the block inside a stmt expr ({...})
1184 so that the block can be reinserted where appropriate. */
1187 delete_block (block)
1191 if (current_binding_level->blocks == block)
1192 current_binding_level->blocks = TREE_CHAIN (block);
1193 for (t = current_binding_level->blocks; t;)
1195 if (TREE_CHAIN (t) == block)
1196 TREE_CHAIN (t) = TREE_CHAIN (block);
1200 TREE_CHAIN (block) = NULL;
1201 /* Clear TREE_USED which is always set by poplevel.
1202 The flag is set again if insert_block is called. */
1203 TREE_USED (block) = 0;
1206 /* Insert BLOCK at the end of the list of subblocks of the
1207 current binding level. This is used when a BIND_EXPR is expanded,
1208 to handle the BLOCK node inside the BIND_EXPR. */
1211 insert_block (block)
1214 TREE_USED (block) = 1;
1215 current_binding_level->blocks
1216 = chainon (current_binding_level->blocks, block);
1219 /* Set the BLOCK node for the innermost scope
1220 (the one we are currently in). */
1224 register tree block;
1226 current_binding_level->this_block = block;
1232 register struct binding_level *newlevel;
1234 /* Reuse or create a struct for this binding level. */
1236 if (free_binding_level)
1238 newlevel = free_binding_level;
1239 free_binding_level = free_binding_level->level_chain;
1243 newlevel = make_binding_level ();
1246 /* Add this level to the front of the chain (stack) of label levels. */
1248 newlevel->level_chain = label_level_chain;
1249 label_level_chain = newlevel;
1251 newlevel->names = named_labels;
1252 newlevel->shadowed = shadowed_labels;
1254 shadowed_labels = 0;
1260 register struct binding_level *level = label_level_chain;
1263 /* Clear out the definitions of the declared labels in this level.
1264 Leave in the list any ordinary, non-declared labels. */
1265 for (link = named_labels, prev = 0; link;)
1267 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1269 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1271 error_with_decl (TREE_VALUE (link),
1272 "label `%s' used but not defined");
1273 /* Avoid crashing later. */
1274 define_label (input_filename, lineno,
1275 DECL_NAME (TREE_VALUE (link)));
1277 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1278 warning_with_decl (TREE_VALUE (link),
1279 "label `%s' defined but not used");
1280 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1282 /* Delete this element from the list. */
1283 link = TREE_CHAIN (link);
1285 TREE_CHAIN (prev) = link;
1287 named_labels = link;
1292 link = TREE_CHAIN (link);
1296 /* Bring back all the labels that were shadowed. */
1297 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1298 if (DECL_NAME (TREE_VALUE (link)) != 0)
1299 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1300 = TREE_VALUE (link);
1302 named_labels = chainon (named_labels, level->names);
1303 shadowed_labels = level->shadowed;
1305 /* Pop the current level, and free the structure for reuse. */
1306 label_level_chain = label_level_chain->level_chain;
1307 level->level_chain = free_binding_level;
1308 free_binding_level = level;
1311 /* Push a definition or a declaration of struct, union or enum tag "name".
1312 "type" should be the type node.
1313 We assume that the tag "name" is not already defined.
1315 Note that the definition may really be just a forward reference.
1316 In that case, the TYPE_SIZE will be zero. */
1319 pushtag (name, type)
1322 register struct binding_level *b;
1324 /* Find the proper binding level for this type tag. */
1326 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1331 /* Record the identifier as the type's name if it has none. */
1333 if (TYPE_NAME (type) == 0)
1334 TYPE_NAME (type) = name;
1337 if (b == global_binding_level)
1338 b->tags = perm_tree_cons (name, type, b->tags);
1340 b->tags = saveable_tree_cons (name, type, b->tags);
1342 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1343 tagged type we just added to the current binding level. This fake
1344 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1345 to output a representation of a tagged type, and it also gives
1346 us a convenient place to record the "scope start" address for the
1349 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1351 /* An approximation for now, so we can tell this is a function-scope tag.
1352 This will be updated in poplevel. */
1353 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1356 /* Handle when a new declaration NEWDECL
1357 has the same name as an old one OLDDECL
1358 in the same binding contour.
1359 Prints an error message if appropriate.
1361 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1362 Otherwise, return 0.
1364 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1365 and OLDDECL is in an outer binding level and should thus not be changed. */
1368 duplicate_decls (newdecl, olddecl, different_binding_level)
1369 register tree newdecl, olddecl;
1370 int different_binding_level;
1372 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1373 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1374 && DECL_INITIAL (newdecl) != 0);
1375 tree oldtype = TREE_TYPE (olddecl);
1376 tree newtype = TREE_TYPE (newdecl);
1379 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1380 DECL_MACHINE_ATTRIBUTES (newdecl)
1381 = merge_machine_decl_attributes (olddecl, newdecl);
1383 if (TREE_CODE (newtype) == ERROR_MARK
1384 || TREE_CODE (oldtype) == ERROR_MARK)
1387 /* New decl is completely inconsistent with the old one =>
1388 tell caller to replace the old one.
1389 This is always an error except in the case of shadowing a builtin. */
1390 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1392 if (TREE_CODE (olddecl) == FUNCTION_DECL
1393 && (DECL_BUILT_IN (olddecl)
1394 || DECL_BUILT_IN_NONANSI (olddecl)))
1396 /* If you declare a built-in or predefined function name as static,
1397 the old definition is overridden,
1398 but optionally warn this was a bad choice of name. */
1399 if (!TREE_PUBLIC (newdecl))
1403 else if (DECL_BUILT_IN (olddecl))
1404 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1406 warning_with_decl (newdecl, "shadowing library function `%s'");
1408 /* Likewise, if the built-in is not ansi, then programs can
1409 override it even globally without an error. */
1410 else if (! DECL_BUILT_IN (olddecl))
1411 warning_with_decl (newdecl,
1412 "library function `%s' declared as non-function");
1414 else if (DECL_BUILT_IN_NONANSI (olddecl))
1415 warning_with_decl (newdecl,
1416 "built-in function `%s' declared as non-function");
1418 warning_with_decl (newdecl,
1419 "built-in function `%s' declared as non-function");
1423 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1424 error_with_decl (olddecl, "previous declaration of `%s'");
1430 /* For real parm decl following a forward decl,
1431 return 1 so old decl will be reused. */
1432 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1433 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1436 /* The new declaration is the same kind of object as the old one.
1437 The declarations may partially match. Print warnings if they don't
1438 match enough. Ultimately, copy most of the information from the new
1439 decl to the old one, and keep using the old one. */
1441 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1442 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1443 && DECL_INITIAL (olddecl) == 0)
1444 /* If -traditional, avoid error for redeclaring fcn
1445 after implicit decl. */
1447 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1448 && DECL_BUILT_IN (olddecl))
1450 /* A function declaration for a built-in function. */
1451 if (!TREE_PUBLIC (newdecl))
1453 /* If you declare a built-in function name as static, the
1454 built-in definition is overridden,
1455 but optionally warn this was a bad choice of name. */
1457 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1458 /* Discard the old built-in function. */
1461 else if (!types_match)
1463 /* Accept the return type of the new declaration if same modes. */
1464 tree oldreturntype = TREE_TYPE (oldtype);
1465 tree newreturntype = TREE_TYPE (newtype);
1467 /* Make sure we put the new type in the same obstack as the old ones.
1468 If the old types are not both in the same obstack, use the
1470 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1471 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1474 push_obstacks_nochange ();
1475 end_temporary_allocation ();
1478 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1480 /* Function types may be shared, so we can't just modify
1481 the return type of olddecl's function type. */
1483 = build_function_type (newreturntype,
1484 TYPE_ARG_TYPES (oldtype));
1486 types_match = comptypes (newtype, trytype);
1490 /* Accept harmless mismatch in first argument type also.
1492 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1493 && TYPE_ARG_TYPES (oldtype) != 0
1494 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1495 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1496 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1497 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1499 /* Function types may be shared, so we can't just modify
1500 the return type of olddecl's function type. */
1502 = build_function_type (TREE_TYPE (oldtype),
1503 tree_cons (NULL_TREE,
1504 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1505 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1507 types_match = comptypes (newtype, trytype);
1511 if (! different_binding_level)
1512 TREE_TYPE (olddecl) = oldtype;
1518 /* If types don't match for a built-in, throw away the built-in. */
1519 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1523 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1524 && DECL_SOURCE_LINE (olddecl) == 0)
1526 /* A function declaration for a predeclared function
1527 that isn't actually built in. */
1528 if (!TREE_PUBLIC (newdecl))
1530 /* If you declare it as static, the
1531 default definition is overridden. */
1534 else if (!types_match)
1536 /* If the types don't match, preserve volatility indication.
1537 Later on, we will discard everything else about the
1538 default declaration. */
1539 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1542 /* Permit char *foo () to match void *foo (...) if not pedantic,
1543 if one of them came from a system header file. */
1544 else if (!types_match
1545 && TREE_CODE (olddecl) == FUNCTION_DECL
1546 && TREE_CODE (newdecl) == FUNCTION_DECL
1547 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1548 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1549 && (DECL_IN_SYSTEM_HEADER (olddecl)
1550 || DECL_IN_SYSTEM_HEADER (newdecl))
1551 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1552 && TYPE_ARG_TYPES (oldtype) == 0
1553 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1554 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1556 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1557 && TYPE_ARG_TYPES (newtype) == 0
1558 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1559 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1562 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1563 /* Make sure we keep void * as ret type, not char *. */
1564 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1565 TREE_TYPE (newdecl) = newtype = oldtype;
1567 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1568 we will come back here again. */
1569 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1571 else if (!types_match
1572 /* Permit char *foo (int, ...); followed by char *foo ();
1574 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1576 /* Return types must still match. */
1577 && comptypes (TREE_TYPE (oldtype),
1578 TREE_TYPE (newtype))
1579 && TYPE_ARG_TYPES (newtype) == 0))
1581 error_with_decl (newdecl, "conflicting types for `%s'");
1582 /* Check for function type mismatch
1583 involving an empty arglist vs a nonempty one. */
1584 if (TREE_CODE (olddecl) == FUNCTION_DECL
1585 && comptypes (TREE_TYPE (oldtype),
1586 TREE_TYPE (newtype))
1587 && ((TYPE_ARG_TYPES (oldtype) == 0
1588 && DECL_INITIAL (olddecl) == 0)
1590 (TYPE_ARG_TYPES (newtype) == 0
1591 && DECL_INITIAL (newdecl) == 0)))
1593 /* Classify the problem further. */
1594 register tree t = TYPE_ARG_TYPES (oldtype);
1596 t = TYPE_ARG_TYPES (newtype);
1597 for (; t; t = TREE_CHAIN (t))
1599 register tree type = TREE_VALUE (t);
1601 if (TREE_CHAIN (t) == 0
1602 && TYPE_MAIN_VARIANT (type) != void_type_node)
1604 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1608 if (simple_type_promotes_to (type) != NULL_TREE)
1610 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1615 error_with_decl (olddecl, "previous declaration of `%s'");
1619 errmsg = redeclaration_error_message (newdecl, olddecl);
1625 error_with_decl (newdecl, "redefinition of `%s'");
1628 error_with_decl (newdecl, "redeclaration of `%s'");
1631 error_with_decl (newdecl, "conflicting declarations of `%s'");
1637 error_with_decl (olddecl,
1638 ((DECL_INITIAL (olddecl)
1639 && current_binding_level == global_binding_level)
1640 ? "`%s' previously defined here"
1641 : "`%s' previously declared here"));
1643 else if (TREE_CODE (newdecl) == TYPE_DECL
1644 && (DECL_IN_SYSTEM_HEADER (olddecl)
1645 || DECL_IN_SYSTEM_HEADER (newdecl)))
1647 warning_with_decl (newdecl, "redefinition of `%s'");
1650 ((DECL_INITIAL (olddecl)
1651 && current_binding_level == global_binding_level)
1652 ? "`%s' previously defined here"
1653 : "`%s' previously declared here"));
1655 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1656 && DECL_INITIAL (olddecl) != 0
1657 && TYPE_ARG_TYPES (oldtype) == 0
1658 && TYPE_ARG_TYPES (newtype) != 0
1659 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1661 register tree type, parm;
1663 /* Prototype decl follows defn w/o prototype. */
1665 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1666 type = TYPE_ARG_TYPES (newtype),
1669 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1671 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1672 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1674 warning_with_decl (newdecl, "prototype for `%s' follows");
1675 warning_with_decl (olddecl, "non-prototype definition here");
1678 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1679 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1681 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1682 error_with_decl (olddecl, "non-prototype definition here");
1686 /* Type for passing arg must be consistent
1687 with that declared for the arg. */
1688 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1689 /* If -traditional, allow `unsigned int' instead of `int'
1690 in the prototype. */
1691 && (! (flag_traditional
1692 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1693 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1695 error_with_decl (newdecl,
1696 "prototype for `%s' follows and argument %d doesn't match",
1698 error_with_decl (olddecl, "non-prototype definition here");
1704 /* Warn about mismatches in various flags. */
1707 /* Warn if function is now inline
1708 but was previously declared not inline and has been called. */
1709 if (TREE_CODE (olddecl) == FUNCTION_DECL
1710 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1711 && TREE_USED (olddecl))
1712 warning_with_decl (newdecl,
1713 "`%s' declared inline after being called");
1714 if (TREE_CODE (olddecl) == FUNCTION_DECL
1715 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1716 && DECL_INITIAL (olddecl) != 0)
1717 warning_with_decl (newdecl,
1718 "`%s' declared inline after its definition");
1720 /* If pedantic, warn when static declaration follows a non-static
1721 declaration. Otherwise, do so only for functions. */
1722 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1723 && TREE_PUBLIC (olddecl)
1724 && !TREE_PUBLIC (newdecl))
1725 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1727 /* If warn_traditional, warn when a non-static function
1728 declaration follows a static one. */
1729 if (warn_traditional
1730 && TREE_CODE (olddecl) == FUNCTION_DECL
1731 && !TREE_PUBLIC (olddecl)
1732 && TREE_PUBLIC (newdecl))
1733 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1735 /* Warn when const declaration follows a non-const
1736 declaration, but not for functions. */
1737 if (TREE_CODE (olddecl) != FUNCTION_DECL
1738 && !TREE_READONLY (olddecl)
1739 && TREE_READONLY (newdecl))
1740 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1741 /* These bits are logically part of the type, for variables.
1742 But not for functions
1743 (where qualifiers are not valid ANSI anyway). */
1744 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1745 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1746 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1747 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1751 /* Optionally warn about more than one declaration for the same name. */
1752 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1753 /* Don't warn about a function declaration
1754 followed by a definition. */
1755 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1756 && DECL_INITIAL (olddecl) == 0)
1757 /* Don't warn about extern decl followed by (tentative) definition. */
1758 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1760 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1761 warning_with_decl (olddecl, "previous declaration of `%s'");
1764 /* Copy all the DECL_... slots specified in the new decl
1765 except for any that we copy here from the old type.
1767 Past this point, we don't change OLDTYPE and NEWTYPE
1768 even if we change the types of NEWDECL and OLDDECL. */
1772 /* When copying info to olddecl, we store into write_olddecl
1773 instead. This allows us to avoid modifying olddecl when
1774 different_binding_level is true. */
1775 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1777 /* Make sure we put the new type in the same obstack as the old ones.
1778 If the old types are not both in the same obstack, use the permanent
1780 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1781 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1784 push_obstacks_nochange ();
1785 end_temporary_allocation ();
1788 /* Merge the data types specified in the two decls. */
1789 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1791 if (different_binding_level)
1793 = build_type_attribute_variant
1795 merge_attributes (TYPE_ATTRIBUTES (newtype),
1796 TYPE_ATTRIBUTES (oldtype)));
1799 = TREE_TYPE (olddecl)
1800 = common_type (newtype, oldtype);
1803 /* Lay the type out, unless already done. */
1804 if (oldtype != TREE_TYPE (newdecl))
1806 if (TREE_TYPE (newdecl) != error_mark_node)
1807 layout_type (TREE_TYPE (newdecl));
1808 if (TREE_CODE (newdecl) != FUNCTION_DECL
1809 && TREE_CODE (newdecl) != TYPE_DECL
1810 && TREE_CODE (newdecl) != CONST_DECL)
1811 layout_decl (newdecl, 0);
1815 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1816 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1817 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1818 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1819 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1822 /* Keep the old rtl since we can safely use it. */
1823 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1825 /* Merge the type qualifiers. */
1826 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1827 && !TREE_THIS_VOLATILE (newdecl))
1828 TREE_THIS_VOLATILE (write_olddecl) = 0;
1829 if (TREE_READONLY (newdecl))
1830 TREE_READONLY (write_olddecl) = 1;
1831 if (TREE_THIS_VOLATILE (newdecl))
1833 TREE_THIS_VOLATILE (write_olddecl) = 1;
1834 if (TREE_CODE (newdecl) == VAR_DECL)
1835 make_var_volatile (newdecl);
1838 /* Keep source location of definition rather than declaration. */
1839 /* When called with different_binding_level set, keep the old
1840 information so that meaningful diagnostics can be given. */
1841 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1842 && ! different_binding_level)
1844 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1845 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1848 /* Merge the unused-warning information. */
1849 if (DECL_IN_SYSTEM_HEADER (olddecl))
1850 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1851 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1852 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1854 /* Merge the initialization information. */
1855 /* When called with different_binding_level set, don't copy over
1856 DECL_INITIAL, so that we don't accidentally change function
1857 declarations into function definitions. */
1858 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1859 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1861 /* Merge the section attribute.
1862 We want to issue an error if the sections conflict but that must be
1863 done later in decl_attributes since we are called before attributes
1865 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1866 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1868 /* Copy the assembler name.
1869 Currently, it can only be defined in the prototype. */
1870 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1872 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1874 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1875 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1877 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1878 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1879 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1880 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1885 /* If cannot merge, then use the new type and qualifiers,
1886 and don't preserve the old rtl. */
1887 else if (! different_binding_level)
1889 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1890 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1891 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1892 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1895 /* Merge the storage class information. */
1896 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1897 /* For functions, static overrides non-static. */
1898 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1900 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1901 /* This is since we don't automatically
1902 copy the attributes of NEWDECL into OLDDECL. */
1903 /* No need to worry about different_binding_level here because
1904 then TREE_PUBLIC (newdecl) was true. */
1905 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1906 /* If this clears `static', clear it in the identifier too. */
1907 if (! TREE_PUBLIC (olddecl))
1908 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1910 if (DECL_EXTERNAL (newdecl))
1912 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1913 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1914 /* An extern decl does not override previous storage class. */
1915 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1916 if (! DECL_EXTERNAL (newdecl))
1917 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1921 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1922 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1925 /* If either decl says `inline', this fn is inline,
1926 unless its definition was passed already. */
1927 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1928 DECL_INLINE (olddecl) = 1;
1929 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1933 if (DECL_BUILT_IN (olddecl))
1935 /* Get rid of any built-in function if new arg types don't match it
1936 or if we have a function definition. */
1937 if (! types_match || new_is_definition)
1939 if (! different_binding_level)
1941 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1942 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1947 /* If redeclaring a builtin function, and not a definition,
1948 it stays built in. */
1949 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1950 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1953 /* Also preserve various other info from the definition. */
1954 else if (! new_is_definition)
1955 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1956 if (! new_is_definition)
1958 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1959 /* When called with different_binding_level set, don't copy over
1960 DECL_INITIAL, so that we don't accidentally change function
1961 declarations into function definitions. */
1962 if (! different_binding_level)
1963 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1964 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1965 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1966 if (DECL_INLINE (newdecl))
1967 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
1970 if (different_binding_level)
1972 /* Don't output a duplicate symbol or debugging information for this
1975 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1976 just have two declarations without a definition. VAR_DECLs may need
1977 the same treatment, I'm not sure. */
1978 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1979 DECL_IGNORED_P (newdecl) = 1;
1981 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1985 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1986 But preserve OLDDECL's DECL_UID. */
1988 register unsigned olddecl_uid = DECL_UID (olddecl);
1990 bcopy ((char *) newdecl + sizeof (struct tree_common),
1991 (char *) olddecl + sizeof (struct tree_common),
1992 sizeof (struct tree_decl) - sizeof (struct tree_common));
1993 DECL_UID (olddecl) = olddecl_uid;
1996 /* NEWDECL contains the merged attribute lists.
1997 Update OLDDECL to be the same. */
1998 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2003 /* Record a decl-node X as belonging to the current lexical scope.
2004 Check for errors (such as an incompatible declaration for the same
2005 name already seen in the same scope).
2007 Returns either X or an old decl for the same name.
2008 If an old decl is returned, it may have been smashed
2009 to agree with what X says. */
2016 register tree name = DECL_NAME (x);
2017 register struct binding_level *b = current_binding_level;
2019 DECL_CONTEXT (x) = current_function_decl;
2020 /* A local extern declaration for a function doesn't constitute nesting.
2021 A local auto declaration does, since it's a forward decl
2022 for a nested function coming later. */
2023 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2024 && DECL_EXTERNAL (x))
2025 DECL_CONTEXT (x) = 0;
2027 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2028 && x != IDENTIFIER_IMPLICIT_DECL (name)
2029 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2030 && !DECL_IN_SYSTEM_HEADER (x))
2031 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2037 int different_binding_level = 0;
2039 t = lookup_name_current_level (name);
2040 /* Don't type check externs here when -traditional. This is so that
2041 code with conflicting declarations inside blocks will get warnings
2042 not errors. X11 for instance depends on this. */
2043 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2045 t = IDENTIFIER_GLOBAL_VALUE (name);
2046 /* Type decls at global scope don't conflict with externs declared
2047 inside lexical blocks. */
2048 if (t && TREE_CODE (t) == TYPE_DECL)
2050 different_binding_level = 1;
2052 if (t != 0 && t == error_mark_node)
2053 /* error_mark_node is 0 for a while during initialization! */
2056 error_with_decl (x, "`%s' used prior to declaration");
2061 file = DECL_SOURCE_FILE (t);
2062 line = DECL_SOURCE_LINE (t);
2065 /* If this decl is `static' and an implicit decl was seen previously,
2066 warn. But don't complain if -traditional,
2067 since traditional compilers don't complain. */
2068 if (! flag_traditional && TREE_PUBLIC (name)
2069 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2070 sets this for all functions. */
2071 && ! TREE_PUBLIC (x)
2072 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2073 /* We used to warn also for explicit extern followed by static,
2074 but sometimes you need to do it that way. */
2075 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2077 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2078 IDENTIFIER_POINTER (name));
2079 pedwarn_with_file_and_line
2080 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2081 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2082 "previous declaration of `%s'",
2083 IDENTIFIER_POINTER (name));
2084 TREE_THIS_VOLATILE (name) = 1;
2087 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2089 if (TREE_CODE (t) == PARM_DECL)
2091 /* Don't allow more than one "real" duplicate
2092 of a forward parm decl. */
2093 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2099 /* If we are processing a typedef statement, generate a whole new
2100 ..._TYPE node (which will be just an variant of the existing
2101 ..._TYPE node with identical properties) and then install the
2102 TYPE_DECL node generated to represent the typedef name as the
2103 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2105 The whole point here is to end up with a situation where each
2106 and every ..._TYPE node the compiler creates will be uniquely
2107 associated with AT MOST one node representing a typedef name.
2108 This way, even though the compiler substitutes corresponding
2109 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2110 early on, later parts of the compiler can always do the reverse
2111 translation and get back the corresponding typedef name. For
2114 typedef struct S MY_TYPE;
2117 Later parts of the compiler might only know that `object' was of
2118 type `struct S' if it were not for code just below. With this
2119 code however, later parts of the compiler see something like:
2121 struct S' == struct S
2122 typedef struct S' MY_TYPE;
2125 And they can then deduce (from the node for type struct S') that
2126 the original object declaration was:
2130 Being able to do this is important for proper support of protoize,
2131 and also for generating precise symbolic debugging information
2132 which takes full account of the programmer's (typedef) vocabulary.
2134 Obviously, we don't want to generate a duplicate ..._TYPE node if
2135 the TYPE_DECL node that we are now processing really represents a
2136 standard built-in type.
2138 Since all standard types are effectively declared at line zero
2139 in the source file, we can easily check to see if we are working
2140 on a standard type by checking the current value of lineno. */
2142 if (TREE_CODE (x) == TYPE_DECL)
2144 if (DECL_SOURCE_LINE (x) == 0)
2146 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2147 TYPE_NAME (TREE_TYPE (x)) = x;
2149 else if (TREE_TYPE (x) != error_mark_node
2150 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2152 tree tt = TREE_TYPE (x);
2153 DECL_ORIGINAL_TYPE (x) = tt;
2154 tt = build_type_copy (tt);
2160 /* Multiple external decls of the same identifier ought to match.
2161 Check against both global declarations (when traditional) and out of
2162 scope (limbo) block level declarations.
2164 We get warnings about inline functions where they are defined.
2165 Avoid duplicate warnings where they are used. */
2166 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2170 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2171 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2172 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2173 decl = IDENTIFIER_GLOBAL_VALUE (name);
2174 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2175 /* Decls in limbo are always extern, so no need to check that. */
2176 decl = IDENTIFIER_LIMBO_VALUE (name);
2180 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2181 /* If old decl is built-in, we already warned if we should. */
2182 && !DECL_BUILT_IN (decl))
2184 pedwarn_with_decl (x,
2185 "type mismatch with previous external decl");
2186 pedwarn_with_decl (decl, "previous external decl of `%s'");
2190 /* If a function has had an implicit declaration, and then is defined,
2191 make sure they are compatible. */
2193 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2194 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2195 && TREE_CODE (x) == FUNCTION_DECL
2196 && ! comptypes (TREE_TYPE (x),
2197 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2199 warning_with_decl (x, "type mismatch with previous implicit declaration");
2200 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2201 "previous implicit declaration of `%s'");
2204 /* In PCC-compatibility mode, extern decls of vars with no current decl
2205 take effect at top level no matter where they are. */
2206 if (flag_traditional && DECL_EXTERNAL (x)
2207 && lookup_name (name) == 0)
2209 tree type = TREE_TYPE (x);
2211 /* But don't do this if the type contains temporary nodes. */
2214 if (type == error_mark_node)
2216 if (! TREE_PERMANENT (type))
2218 warning_with_decl (x, "type of external `%s' is not global");
2219 /* By exiting the loop early, we leave TYPE nonzero,
2220 and thus prevent globalization of the decl. */
2223 else if (TREE_CODE (type) == FUNCTION_TYPE
2224 && TYPE_ARG_TYPES (type) != 0)
2225 /* The types might not be truly local,
2226 but the list of arg types certainly is temporary.
2227 Since prototypes are nontraditional,
2228 ok not to do the traditional thing. */
2230 type = TREE_TYPE (type);
2234 b = global_binding_level;
2237 /* This name is new in its binding level.
2238 Install the new declaration and return it. */
2239 if (b == global_binding_level)
2241 /* Install a global value. */
2243 /* If the first global decl has external linkage,
2244 warn if we later see static one. */
2245 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2246 TREE_PUBLIC (name) = 1;
2248 IDENTIFIER_GLOBAL_VALUE (name) = x;
2250 /* We no longer care about any previous block level declarations. */
2251 IDENTIFIER_LIMBO_VALUE (name) = 0;
2253 /* Don't forget if the function was used via an implicit decl. */
2254 if (IDENTIFIER_IMPLICIT_DECL (name)
2255 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2256 TREE_USED (x) = 1, TREE_USED (name) = 1;
2258 /* Don't forget if its address was taken in that way. */
2259 if (IDENTIFIER_IMPLICIT_DECL (name)
2260 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2261 TREE_ADDRESSABLE (x) = 1;
2263 /* Warn about mismatches against previous implicit decl. */
2264 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2265 /* If this real decl matches the implicit, don't complain. */
2266 && ! (TREE_CODE (x) == FUNCTION_DECL
2267 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2268 == integer_type_node)))
2269 pedwarn ("`%s' was previously implicitly declared to return `int'",
2270 IDENTIFIER_POINTER (name));
2272 /* If this decl is `static' and an `extern' was seen previously,
2273 that is erroneous. */
2274 if (TREE_PUBLIC (name)
2275 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2277 /* Okay to redeclare an ANSI built-in as static. */
2278 if (t != 0 && DECL_BUILT_IN (t))
2280 /* Okay to declare a non-ANSI built-in as anything. */
2281 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2283 /* Okay to have global type decl after an earlier extern
2284 declaration inside a lexical block. */
2285 else if (TREE_CODE (x) == TYPE_DECL)
2287 else if (IDENTIFIER_IMPLICIT_DECL (name))
2289 if (! TREE_THIS_VOLATILE (name))
2290 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2291 IDENTIFIER_POINTER (name));
2294 pedwarn ("`%s' was declared `extern' and later `static'",
2295 IDENTIFIER_POINTER (name));
2300 /* Here to install a non-global value. */
2301 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2302 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2303 IDENTIFIER_LOCAL_VALUE (name) = x;
2305 /* If this is an extern function declaration, see if we
2306 have a global definition or declaration for the function. */
2308 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2310 && TREE_CODE (x) == FUNCTION_DECL
2311 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2313 /* We have one. Their types must agree. */
2314 if (! comptypes (TREE_TYPE (x),
2315 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2316 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2319 /* Inner extern decl is inline if global one is.
2320 Copy enough to really inline it. */
2321 if (DECL_INLINE (oldglobal))
2323 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2324 DECL_INITIAL (x) = (current_function_decl == oldglobal
2325 ? 0 : DECL_INITIAL (oldglobal));
2326 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2327 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2328 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2329 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2330 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2331 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2333 /* Inner extern decl is built-in if global one is. */
2334 if (DECL_BUILT_IN (oldglobal))
2336 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2337 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2339 /* Keep the arg types from a file-scope fcn defn. */
2340 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2341 && DECL_INITIAL (oldglobal)
2342 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2343 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2347 #if 0 /* This case is probably sometimes the right thing to do. */
2348 /* If we have a local external declaration,
2349 then any file-scope declaration should not
2350 have been static. */
2351 if (oldlocal == 0 && oldglobal != 0
2352 && !TREE_PUBLIC (oldglobal)
2353 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2354 warning ("`%s' locally external but globally static",
2355 IDENTIFIER_POINTER (name));
2358 /* If we have a local external declaration,
2359 and no file-scope declaration has yet been seen,
2360 then if we later have a file-scope decl it must not be static. */
2362 && DECL_EXTERNAL (x)
2366 TREE_PUBLIC (name) = 1;
2368 /* Save this decl, so that we can do type checking against
2369 other decls after it falls out of scope.
2371 Only save it once. This prevents temporary decls created in
2372 expand_inline_function from being used here, since this
2373 will have been set when the inline function was parsed.
2374 It also helps give slightly better warnings. */
2375 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2376 IDENTIFIER_LIMBO_VALUE (name) = x;
2379 /* Warn if shadowing an argument at the top level of the body. */
2380 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2381 /* This warning doesn't apply to the parms of a nested fcn. */
2382 && ! current_binding_level->parm_flag
2383 /* Check that this is one level down from the parms. */
2384 && current_binding_level->level_chain->parm_flag
2385 /* Check that the decl being shadowed
2386 comes from the parm level, one level up. */
2387 && chain_member (oldlocal, current_binding_level->level_chain->names))
2389 if (TREE_CODE (oldlocal) == PARM_DECL)
2390 pedwarn ("declaration of `%s' shadows a parameter",
2391 IDENTIFIER_POINTER (name));
2393 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2394 IDENTIFIER_POINTER (name));
2397 /* Maybe warn if shadowing something else. */
2398 else if (warn_shadow && !DECL_EXTERNAL (x)
2399 /* No shadow warnings for internally generated vars. */
2400 && DECL_SOURCE_LINE (x) != 0
2401 /* No shadow warnings for vars made for inlining. */
2402 && ! DECL_FROM_INLINE (x))
2404 char *id = IDENTIFIER_POINTER (name);
2406 if (TREE_CODE (x) == PARM_DECL
2407 && current_binding_level->level_chain->parm_flag)
2408 /* Don't warn about the parm names in function declarator
2409 within a function declarator.
2410 It would be nice to avoid warning in any function
2411 declarator in a declaration, as opposed to a definition,
2412 but there is no way to tell it's not a definition. */
2414 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2415 warning ("declaration of `%s' shadows a parameter", id);
2416 else if (oldlocal != 0)
2417 warning ("declaration of `%s' shadows previous local", id);
2418 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2419 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2420 warning ("declaration of `%s' shadows global declaration", id);
2423 /* If storing a local value, there may already be one (inherited).
2424 If so, record it for restoration when this binding level ends. */
2426 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2429 /* Keep count of variables in this level with incomplete type. */
2430 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2434 /* Put decls on list in reverse order.
2435 We will reverse them later if necessary. */
2436 TREE_CHAIN (x) = b->names;
2442 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2445 pushdecl_top_level (x)
2449 register struct binding_level *b = current_binding_level;
2451 current_binding_level = global_binding_level;
2453 current_binding_level = b;
2457 /* Generate an implicit declaration for identifier FUNCTIONID
2458 as a function of type int (). Print a warning if appropriate. */
2461 implicitly_declare (functionid)
2465 int traditional_warning = 0;
2466 /* Only one "implicit declaration" warning per identifier. */
2467 int implicit_warning;
2469 /* Save the decl permanently so we can warn if definition follows. */
2470 push_obstacks_nochange ();
2471 end_temporary_allocation ();
2473 /* We used to reuse an old implicit decl here,
2474 but this loses with inline functions because it can clobber
2475 the saved decl chains. */
2476 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2477 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2479 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2481 /* Warn of implicit decl following explicit local extern decl.
2482 This is probably a program designed for traditional C. */
2483 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2484 traditional_warning = 1;
2486 /* Warn once of an implicit declaration. */
2487 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2489 DECL_EXTERNAL (decl) = 1;
2490 TREE_PUBLIC (decl) = 1;
2492 /* Record that we have an implicit decl and this is it. */
2493 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2495 /* ANSI standard says implicit declarations are in the innermost block.
2496 So we record the decl in the standard fashion.
2497 If flag_traditional is set, pushdecl does it top-level. */
2500 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2501 maybe_objc_check_decl (decl);
2503 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2505 if (mesg_implicit_function_declaration && implicit_warning)
2507 if (mesg_implicit_function_declaration == 2)
2508 error ("implicit declaration of function `%s'",
2509 IDENTIFIER_POINTER (functionid));
2511 warning ("implicit declaration of function `%s'",
2512 IDENTIFIER_POINTER (functionid));
2514 else if (warn_traditional && traditional_warning)
2515 warning ("function `%s' was previously declared within a block",
2516 IDENTIFIER_POINTER (functionid));
2518 /* Write a record describing this implicit function declaration to the
2519 prototypes file (if requested). */
2521 gen_aux_info_record (decl, 0, 1, 0);
2528 /* Return zero if the declaration NEWDECL is valid
2529 when the declaration OLDDECL (assumed to be for the same name)
2530 has already been seen.
2531 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2532 and 3 if it is a conflicting declaration. */
2535 redeclaration_error_message (newdecl, olddecl)
2536 tree newdecl, olddecl;
2538 if (TREE_CODE (newdecl) == TYPE_DECL)
2540 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2542 /* pushdecl creates distinct types for TYPE_DECLs by calling
2543 build_type_copy, so the above comparison generally fails. We do
2544 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2545 is equivalent to what this code used to do before the build_type_copy
2546 call. The variant type distinction should not matter for traditional
2547 code, because it doesn't have type qualifiers. */
2548 if (flag_traditional
2549 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2551 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2555 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2557 /* Declarations of functions can insist on internal linkage
2558 but they can't be inconsistent with internal linkage,
2559 so there can be no error on that account.
2560 However defining the same name twice is no good. */
2561 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2562 /* However, defining once as extern inline and a second
2563 time in another way is ok. */
2564 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2565 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2569 else if (current_binding_level == global_binding_level)
2571 /* Objects declared at top level: */
2572 /* If at least one is a reference, it's ok. */
2573 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2575 /* Reject two definitions. */
2576 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2578 /* Now we have two tentative defs, or one tentative and one real def. */
2579 /* Insist that the linkage match. */
2580 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2584 else if (current_binding_level->parm_flag
2585 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2589 /* Newdecl has block scope. If olddecl has block scope also, then
2590 reject two definitions, and reject a definition together with an
2591 external reference. Otherwise, it is OK, because newdecl must
2592 be an extern reference to olddecl. */
2593 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2594 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2600 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2601 Create one if none exists so far for the current function.
2602 This function is called for both label definitions and label references. */
2608 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2610 if (current_function_decl == 0)
2612 error ("label %s referenced outside of any function",
2613 IDENTIFIER_POINTER (id));
2617 /* Use a label already defined or ref'd with this name. */
2620 /* But not if it is inherited and wasn't declared to be inheritable. */
2621 if (DECL_CONTEXT (decl) != current_function_decl
2622 && ! C_DECLARED_LABEL_FLAG (decl))
2623 return shadow_label (id);
2627 decl = build_decl (LABEL_DECL, id, void_type_node);
2629 /* Make sure every label has an rtx. */
2632 /* A label not explicitly declared must be local to where it's ref'd. */
2633 DECL_CONTEXT (decl) = current_function_decl;
2635 DECL_MODE (decl) = VOIDmode;
2637 /* Say where one reference is to the label,
2638 for the sake of the error if it is not defined. */
2639 DECL_SOURCE_LINE (decl) = lineno;
2640 DECL_SOURCE_FILE (decl) = input_filename;
2642 IDENTIFIER_LABEL_VALUE (id) = decl;
2644 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2649 /* Make a label named NAME in the current function,
2650 shadowing silently any that may be inherited from containing functions
2651 or containing scopes.
2653 Note that valid use, if the label being shadowed
2654 comes from another scope in the same function,
2655 requires calling declare_nonlocal_label right away. */
2661 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2667 /* Check to make sure that the label hasn't already been declared
2668 at this label scope */
2669 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2670 if (TREE_VALUE (dup) == decl)
2672 error ("duplicate label declaration `%s'",
2673 IDENTIFIER_POINTER (name));
2674 error_with_decl (TREE_VALUE (dup),
2675 "this is a previous declaration");
2676 /* Just use the previous declaration. */
2677 return lookup_label (name);
2680 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2681 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2684 return lookup_label (name);
2687 /* Define a label, specifying the location in the source file.
2688 Return the LABEL_DECL node for the label, if the definition is valid.
2689 Otherwise return 0. */
2692 define_label (filename, line, name)
2697 tree decl = lookup_label (name);
2699 /* If label with this name is known from an outer context, shadow it. */
2700 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2702 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2703 IDENTIFIER_LABEL_VALUE (name) = 0;
2704 decl = lookup_label (name);
2707 if (DECL_INITIAL (decl) != 0)
2709 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2714 /* Mark label as having been defined. */
2715 DECL_INITIAL (decl) = error_mark_node;
2716 /* Say where in the source. */
2717 DECL_SOURCE_FILE (decl) = filename;
2718 DECL_SOURCE_LINE (decl) = line;
2723 /* Return the list of declarations of the current level.
2724 Note that this list is in reverse order unless/until
2725 you nreverse it; and when you do nreverse it, you must
2726 store the result back using `storedecls' or you will lose. */
2731 return current_binding_level->names;
2734 /* Return the list of type-tags (for structs, etc) of the current level. */
2739 return current_binding_level->tags;
2742 /* Store the list of declarations of the current level.
2743 This is done for the parameter declarations of a function being defined,
2744 after they are modified in the light of any missing parameters. */
2750 current_binding_level->names = decls;
2753 /* Similarly, store the list of tags of the current level. */
2759 current_binding_level->tags = tags;
2762 /* Given NAME, an IDENTIFIER_NODE,
2763 return the structure (or union or enum) definition for that name.
2764 Searches binding levels from BINDING_LEVEL up to the global level.
2765 If THISLEVEL_ONLY is nonzero, searches only the specified context
2766 (but skips any tag-transparent contexts to find one that is
2767 meaningful for tags).
2768 CODE says which kind of type the caller wants;
2769 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2770 If the wrong kind of type is found, an error is reported. */
2773 lookup_tag (code, name, binding_level, thislevel_only)
2774 enum tree_code code;
2775 struct binding_level *binding_level;
2779 register struct binding_level *level;
2781 for (level = binding_level; level; level = level->level_chain)
2784 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2786 if (TREE_PURPOSE (tail) == name)
2788 if (TREE_CODE (TREE_VALUE (tail)) != code)
2790 /* Definition isn't the kind we were looking for. */
2791 pending_invalid_xref = name;
2792 pending_invalid_xref_file = input_filename;
2793 pending_invalid_xref_line = lineno;
2795 return TREE_VALUE (tail);
2798 if (thislevel_only && ! level->tag_transparent)
2804 /* Print an error message now
2805 for a recent invalid struct, union or enum cross reference.
2806 We don't print them immediately because they are not invalid
2807 when used in the `struct foo;' construct for shadowing. */
2810 pending_xref_error ()
2812 if (pending_invalid_xref != 0)
2813 error_with_file_and_line (pending_invalid_xref_file,
2814 pending_invalid_xref_line,
2815 "`%s' defined as wrong kind of tag",
2816 IDENTIFIER_POINTER (pending_invalid_xref));
2817 pending_invalid_xref = 0;
2820 /* Given a type, find the tag that was defined for it and return the tag name.
2821 Otherwise return 0. */
2824 lookup_tag_reverse (type)
2827 register struct binding_level *level;
2829 for (level = current_binding_level; level; level = level->level_chain)
2832 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2834 if (TREE_VALUE (tail) == type)
2835 return TREE_PURPOSE (tail);
2841 /* Look up NAME in the current binding level and its superiors
2842 in the namespace of variables, functions and typedefs.
2843 Return a ..._DECL node of some kind representing its definition,
2844 or return 0 if it is undefined. */
2851 if (current_binding_level != global_binding_level
2852 && IDENTIFIER_LOCAL_VALUE (name))
2853 val = IDENTIFIER_LOCAL_VALUE (name);
2855 val = IDENTIFIER_GLOBAL_VALUE (name);
2859 /* Similar to `lookup_name' but look only at current binding level. */
2862 lookup_name_current_level (name)
2867 if (current_binding_level == global_binding_level)
2868 return IDENTIFIER_GLOBAL_VALUE (name);
2870 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2873 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2874 if (DECL_NAME (t) == name)
2880 /* Mark ARG for GC. */
2882 mark_binding_level (arg)
2885 struct binding_level *level = *(struct binding_level **) arg;
2889 ggc_mark_tree (level->names);
2890 ggc_mark_tree (level->tags);
2891 ggc_mark_tree (level->shadowed);
2892 ggc_mark_tree (level->blocks);
2893 ggc_mark_tree (level->this_block);
2894 ggc_mark_tree (level->parm_order);
2895 level = level->level_chain;
2899 /* Create the predefined scalar types of C,
2900 and some nodes representing standard constants (0, 1, (void *) 0).
2901 Initialize the global binding level.
2902 Make definitions for built-in primitive functions. */
2905 init_decl_processing ()
2907 register tree endlink;
2908 tree ptr_ftype_void, ptr_ftype_ptr;
2909 int wchar_type_size;
2910 tree array_domain_type;
2912 current_function_decl = NULL;
2913 named_labels = NULL;
2914 current_binding_level = NULL_BINDING_LEVEL;
2915 free_binding_level = NULL_BINDING_LEVEL;
2916 pushlevel (0); /* make the binding_level structure for global names */
2917 global_binding_level = current_binding_level;
2919 build_common_tree_nodes (flag_signed_char);
2921 /* Define `int' and `char' first so that dbx will output them first. */
2922 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2923 integer_type_node));
2924 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2926 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2927 long_integer_type_node));
2928 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2929 unsigned_type_node));
2930 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2931 long_unsigned_type_node));
2932 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2933 long_long_integer_type_node));
2934 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2935 long_long_unsigned_type_node));
2936 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2937 short_integer_type_node));
2938 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2939 short_unsigned_type_node));
2940 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2941 signed_char_type_node));
2942 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2943 unsigned_char_type_node));
2944 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2945 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2946 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2947 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2948 #if HOST_BITS_PER_WIDE_INT >= 64
2949 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2951 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2952 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2953 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2954 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2955 #if HOST_BITS_PER_WIDE_INT >= 64
2956 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2959 /* `unsigned long' is the standard type for sizeof.
2960 Traditionally, use a signed type.
2961 Note that stddef.h uses `unsigned long',
2962 and this must agree, even if long and int are the same size. */
2964 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2965 if (flag_traditional && TREE_UNSIGNED (sizetype))
2966 set_sizetype (signed_type (sizetype));
2968 /* Create the widest literal types. */
2969 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2970 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2971 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2972 widest_integer_literal_type_node));
2973 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2974 widest_unsigned_literal_type_node));
2976 build_common_tree_nodes_2 (flag_short_double);
2978 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2980 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2983 long_double_type_node));
2984 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2985 complex_integer_type_node));
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2987 complex_float_type_node));
2988 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2989 complex_double_type_node));
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2991 complex_long_double_type_node));
2992 pushdecl (build_decl (TYPE_DECL,
2993 ridpointers[(int) RID_VOID], void_type_node));
2995 wchar_type_node = get_identifier (flag_short_wchar
2996 ? "short unsigned int"
2998 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
2999 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3000 signed_wchar_type_node = signed_type (wchar_type_node);
3001 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3003 boolean_type_node = integer_type_node;
3004 boolean_true_node = integer_one_node;
3005 boolean_false_node = integer_zero_node;
3007 string_type_node = build_pointer_type (char_type_node);
3008 const_string_type_node
3009 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3011 /* Make a type to be the domain of a few array types
3012 whose domains don't really matter.
3013 200 is small enough that it always fits in size_t
3014 and large enough that it can hold most function names for the
3015 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3016 array_domain_type = build_index_type (build_int_2 (200, 0));
3018 /* make a type for arrays of characters.
3019 With luck nothing will ever really depend on the length of this
3021 char_array_type_node
3022 = build_array_type (char_type_node, array_domain_type);
3023 /* Likewise for arrays of ints. */
3025 = build_array_type (integer_type_node, array_domain_type);
3026 /* This is for wide string constants. */
3027 wchar_array_type_node
3028 = build_array_type (wchar_type_node, array_domain_type);
3030 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3032 default_function_type
3033 = build_function_type (integer_type_node, NULL_TREE);
3035 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3037 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3039 endlink = void_list_node;
3040 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3042 = build_function_type (ptr_type_node,
3043 tree_cons (NULL_TREE, ptr_type_node, endlink));
3045 builtin_function ("__builtin_aggregate_incoming_address",
3046 build_function_type (ptr_type_node, NULL_TREE),
3047 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3048 BUILT_IN_NORMAL, NULL_PTR);
3050 /* Hooks for the DWARF 2 __throw routine. */
3051 builtin_function ("__builtin_unwind_init",
3052 build_function_type (void_type_node, endlink),
3053 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3054 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3055 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3056 builtin_function ("__builtin_dwarf_fp_regnum",
3057 build_function_type (unsigned_type_node, endlink),
3058 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3059 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3060 BUILT_IN_DWARF_REG_SIZE, BUILT_IN_NORMAL, NULL_PTR);
3061 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3062 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3063 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3064 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3066 ("__builtin_eh_return",
3067 build_function_type (void_type_node,
3068 tree_cons (NULL_TREE, ptr_type_node,
3069 tree_cons (NULL_TREE,
3070 type_for_mode (ptr_mode, 0),
3071 tree_cons (NULL_TREE,
3074 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3076 pedantic_lvalues = pedantic;
3078 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3079 declare_function_name ();
3081 start_identifier_warnings ();
3083 /* Prepare to check format strings against argument lists. */
3084 init_function_format_info ();
3088 incomplete_decl_finalize_hook = finish_incomplete_decl;
3090 lang_get_alias_set = c_get_alias_set;
3092 /* Record our roots. */
3094 ggc_add_tree_root (c_global_trees, CTI_MAX);
3095 ggc_add_tree_root (¤t_function_decl, 1);
3096 ggc_add_tree_root (&named_labels, 1);
3097 ggc_add_tree_root (&shadowed_labels, 1);
3098 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3099 mark_binding_level);
3100 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3101 mark_binding_level);
3102 ggc_add_tree_root (&static_ctors, 1);
3103 ggc_add_tree_root (&static_dtors, 1);
3106 /* Return a definition for a builtin function named NAME and whose data type
3107 is TYPE. TYPE should be a function type with argument types.
3108 FUNCTION_CODE tells later passes how to compile calls to this function.
3109 See tree.h for its possible values.
3111 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3112 the name to be called if we can't opencode the function. */
3115 builtin_function (name, type, function_code, class, library_name)
3119 enum built_in_class class;
3120 const char *library_name;
3122 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3123 DECL_EXTERNAL (decl) = 1;
3124 TREE_PUBLIC (decl) = 1;
3125 /* If -traditional, permit redefining a builtin function any way you like.
3126 (Though really, if the program redefines these functions,
3127 it probably won't work right unless compiled with -fno-builtin.) */
3128 if (flag_traditional && name[0] != '_')
3129 DECL_BUILT_IN_NONANSI (decl) = 1;
3131 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3132 make_decl_rtl (decl, NULL_PTR, 1);
3134 DECL_BUILT_IN_CLASS (decl) = class;
3135 DECL_FUNCTION_CODE (decl) = function_code;
3137 /* Warn if a function in the namespace for users
3138 is used without an occasion to consider it declared. */
3139 if (name[0] != '_' || name[1] != '_')
3140 C_DECL_ANTICIPATED (decl) = 1;
3145 /* Called when a declaration is seen that contains no names to declare.
3146 If its type is a reference to a structure, union or enum inherited
3147 from a containing scope, shadow that tag name for the current scope
3148 with a forward reference.
3149 If its type defines a new named structure or union
3150 or defines an enum, it is valid but we need not do anything here.
3151 Otherwise, it is an error. */
3154 shadow_tag (declspecs)
3157 shadow_tag_warned (declspecs, 0);
3161 shadow_tag_warned (declspecs, warned)
3164 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3171 pending_invalid_xref = 0;
3173 /* Remove the attributes from declspecs, since they will confuse the
3175 split_specs_attrs (declspecs, &specs, &attrs);
3177 for (link = specs; link; link = TREE_CHAIN (link))
3179 register tree value = TREE_VALUE (link);
3180 register enum tree_code code = TREE_CODE (value);
3182 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3183 /* Used to test also that TYPE_SIZE (value) != 0.
3184 That caused warning for `struct foo;' at top level in the file. */
3186 register tree name = lookup_tag_reverse (value);
3193 if (warned != 1 && code != ENUMERAL_TYPE)
3194 /* Empty unnamed enum OK */
3196 pedwarn ("unnamed struct/union that defines no instances");
3202 t = lookup_tag (code, name, current_binding_level, 1);
3206 t = make_node (code);
3213 if (!warned && ! in_system_header)
3215 warning ("useless keyword or type name in empty declaration");
3222 error ("two types specified in one empty declaration");
3227 pedwarn ("empty declaration");
3231 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3234 groktypename (typename)
3237 if (TREE_CODE (typename) != TREE_LIST)
3239 return grokdeclarator (TREE_VALUE (typename),
3240 TREE_PURPOSE (typename),
3244 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3247 groktypename_in_parm_context (typename)
3250 if (TREE_CODE (typename) != TREE_LIST)
3252 return grokdeclarator (TREE_VALUE (typename),
3253 TREE_PURPOSE (typename),
3257 /* Decode a declarator in an ordinary declaration or data definition.
3258 This is called as soon as the type information and variable name
3259 have been parsed, before parsing the initializer if any.
3260 Here we create the ..._DECL node, fill in its type,
3261 and put it on the list of decls for the current context.
3262 The ..._DECL node is returned as the value.
3264 Exception: for arrays where the length is not specified,
3265 the type is left null, to be filled in by `finish_decl'.
3267 Function definitions do not come here; they go to start_function
3268 instead. However, external and forward declarations of functions
3269 do go through here. Structure field declarations are done by
3270 grokfield and not through here. */
3272 /* Set this to zero to debug not using the temporary obstack
3273 to parse initializers. */
3274 int debug_temp_inits = 1;
3277 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3278 tree declarator, declspecs;
3280 tree attributes, prefix_attributes;
3282 register tree decl = grokdeclarator (declarator, declspecs,
3283 NORMAL, initialized);
3285 int init_written = initialized;
3287 /* The corresponding pop_obstacks is in finish_decl. */
3288 push_obstacks_nochange ();
3290 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3291 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3292 warning_with_decl (decl, "`%s' is usually a function");
3295 /* Is it valid for this decl to have an initializer at all?
3296 If not, set INITIALIZED to zero, which will indirectly
3297 tell `finish_decl' to ignore the initializer once it is parsed. */
3298 switch (TREE_CODE (decl))
3301 /* typedef foo = bar means give foo the same type as bar.
3302 We haven't parsed bar yet, so `finish_decl' will fix that up.
3303 Any other case of an initialization in a TYPE_DECL is an error. */
3304 if (pedantic || list_length (declspecs) > 1)
3306 error ("typedef `%s' is initialized",
3307 IDENTIFIER_POINTER (DECL_NAME (decl)));
3313 error ("function `%s' is initialized like a variable",
3314 IDENTIFIER_POINTER (DECL_NAME (decl)));
3319 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3320 error ("parameter `%s' is initialized",
3321 IDENTIFIER_POINTER (DECL_NAME (decl)));
3326 /* Don't allow initializations for incomplete types
3327 except for arrays which might be completed by the initialization. */
3328 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3330 /* A complete type is ok if size is fixed. */
3332 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3333 || C_DECL_VARIABLE_SIZE (decl))
3335 error ("variable-sized object may not be initialized");
3339 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3341 error ("variable `%s' has initializer but incomplete type",
3342 IDENTIFIER_POINTER (DECL_NAME (decl)));
3345 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3347 error ("elements of array `%s' have incomplete type",
3348 IDENTIFIER_POINTER (DECL_NAME (decl)));
3355 #if 0 /* Seems redundant with grokdeclarator. */
3356 if (current_binding_level != global_binding_level
3357 && DECL_EXTERNAL (decl)
3358 && TREE_CODE (decl) != FUNCTION_DECL)
3359 warning ("declaration of `%s' has `extern' and is initialized",
3360 IDENTIFIER_POINTER (DECL_NAME (decl)));
3362 DECL_EXTERNAL (decl) = 0;
3363 if (current_binding_level == global_binding_level)
3364 TREE_STATIC (decl) = 1;
3366 /* Tell `pushdecl' this is an initialized decl
3367 even though we don't yet have the initializer expression.
3368 Also tell `finish_decl' it may store the real initializer. */
3369 DECL_INITIAL (decl) = error_mark_node;
3372 /* If this is a function declaration, write a record describing it to the
3373 prototypes file (if requested). */
3375 if (TREE_CODE (decl) == FUNCTION_DECL)
3376 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3378 /* ANSI specifies that a tentative definition which is not merged with
3379 a non-tentative definition behaves exactly like a definition with an
3380 initializer equal to zero. (Section 3.7.2)
3381 -fno-common gives strict ANSI behavior. Usually you don't want it.
3382 This matters only for variables with external linkage. */
3383 if (! flag_no_common || ! TREE_PUBLIC (decl))
3384 DECL_COMMON (decl) = 1;
3386 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3387 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3390 /* Set attributes here so if duplicate decl, will have proper attributes. */
3391 decl_attributes (decl, attributes, prefix_attributes);
3393 /* Add this decl to the current binding level.
3394 TEM may equal DECL or it may be a previous decl of the same name. */
3395 tem = pushdecl (decl);
3397 /* For a local variable, define the RTL now. */
3398 if (current_binding_level != global_binding_level
3399 /* But not if this is a duplicate decl
3400 and we preserved the rtl from the previous one
3401 (which may or may not happen). */
3402 && DECL_RTL (tem) == 0)
3404 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3406 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3407 && DECL_INITIAL (tem) != 0)
3413 /* When parsing and digesting the initializer,
3414 use temporary storage. Do this even if we will ignore the value. */
3415 if (current_binding_level == global_binding_level && debug_temp_inits)
3416 temporary_allocation ();
3422 /* Finish processing of a declaration;
3423 install its initial value.
3424 If the length of an array type is not known before,
3425 it must be determined now, from the initial value, or it is an error. */
3428 finish_decl (decl, init, asmspec_tree)
3432 register tree type = TREE_TYPE (decl);
3433 int was_incomplete = (DECL_SIZE (decl) == 0);
3434 int temporary = allocation_temporary_p ();
3437 /* If a name was specified, get the string. */
3439 asmspec = TREE_STRING_POINTER (asmspec_tree);
3441 /* If `start_decl' didn't like having an initialization, ignore it now. */
3443 if (init != 0 && DECL_INITIAL (decl) == 0)
3445 /* Don't crash if parm is initialized. */
3446 if (TREE_CODE (decl) == PARM_DECL)
3449 if (ITERATOR_P (decl))
3452 error_with_decl (decl, "iterator has no initial value");
3454 init = save_expr (init);
3459 if (TREE_CODE (decl) != TYPE_DECL)
3460 store_init_value (decl, init);
3463 /* typedef foo = bar; store the type of bar as the type of foo. */
3464 TREE_TYPE (decl) = TREE_TYPE (init);
3465 DECL_INITIAL (decl) = init = 0;
3469 /* Pop back to the obstack that is current for this binding level.
3470 This is because MAXINDEX, rtl, etc. to be made below
3471 must go in the permanent obstack. But don't discard the
3472 temporary data yet. */
3474 #if 0 /* pop_obstacks was near the end; this is what was here. */
3475 if (current_binding_level == global_binding_level && temporary)
3476 end_temporary_allocation ();
3479 /* Deduce size of array from initialization, if not already known */
3481 if (TREE_CODE (type) == ARRAY_TYPE
3482 && TYPE_DOMAIN (type) == 0
3483 && TREE_CODE (decl) != TYPE_DECL)
3486 = (TREE_STATIC (decl)
3487 /* Even if pedantic, an external linkage array
3488 may have incomplete type at first. */
3489 ? pedantic && !TREE_PUBLIC (decl)
3490 : !DECL_EXTERNAL (decl));
3492 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3494 /* Get the completed type made by complete_array_type. */
3495 type = TREE_TYPE (decl);
3498 error_with_decl (decl, "initializer fails to determine size of `%s'");
3503 error_with_decl (decl, "array size missing in `%s'");
3504 /* If a `static' var's size isn't known,
3505 make it extern as well as static, so it does not get
3507 If it is not `static', then do not mark extern;
3508 finish_incomplete_decl will give it a default size
3509 and it will get allocated. */
3510 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3511 DECL_EXTERNAL (decl) = 1;
3514 /* TYPE_MAX_VALUE is always one less than the number of elements
3515 in the array, because we start counting at zero. Therefore,
3516 warn only if the value is less than zero. */
3517 if (pedantic && TYPE_DOMAIN (type) != 0
3518 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3519 error_with_decl (decl, "zero or negative size array `%s'");
3521 layout_decl (decl, 0);
3524 if (TREE_CODE (decl) == VAR_DECL)
3526 if (DECL_SIZE (decl) == 0
3527 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3528 layout_decl (decl, 0);
3530 if (DECL_SIZE (decl) == 0
3531 && (TREE_STATIC (decl)
3533 /* A static variable with an incomplete type
3534 is an error if it is initialized.
3535 Also if it is not file scope.
3536 Otherwise, let it through, but if it is not `extern'
3537 then it may cause an error message later. */
3538 /* A duplicate_decls call could have changed an extern
3539 declaration into a file scope one. This can be detected
3540 by TREE_ASM_WRITTEN being set. */
3541 (DECL_INITIAL (decl) != 0
3542 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3544 /* An automatic variable with an incomplete type
3546 !DECL_EXTERNAL (decl)))
3548 error_with_decl (decl, "storage size of `%s' isn't known");
3549 TREE_TYPE (decl) = error_mark_node;
3552 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3553 && DECL_SIZE (decl) != 0)
3555 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3556 constant_expression_warning (DECL_SIZE (decl));
3558 error_with_decl (decl, "storage size of `%s' isn't constant");
3561 if (TREE_USED (type))
3562 TREE_USED (decl) = 1;
3565 /* If this is a function and an assembler name is specified, it isn't
3566 builtin any more. Also reset DECL_RTL so we can give it its new
3568 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3570 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3571 DECL_RTL (decl) = 0;
3572 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3575 /* Output the assembler code and/or RTL code for variables and functions,
3576 unless the type is an undefined structure or union.
3577 If not, it will get done when the type is completed. */
3579 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3581 if ((flag_traditional || TREE_PERMANENT (decl))
3582 && allocation_temporary_p ())
3584 push_obstacks_nochange ();
3585 end_temporary_allocation ();
3586 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3587 maybe_objc_check_decl (decl);
3588 rest_of_decl_compilation (decl, asmspec,
3589 (DECL_CONTEXT (decl) == 0
3590 || TREE_ASM_WRITTEN (decl)),
3596 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3597 maybe_objc_check_decl (decl);
3598 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3601 if (DECL_CONTEXT (decl) != 0)
3603 /* Recompute the RTL of a local array now
3604 if it used to be an incomplete type. */
3606 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3608 /* If we used it already as memory, it must stay in memory. */
3609 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3610 /* If it's still incomplete now, no init will save it. */
3611 if (DECL_SIZE (decl) == 0)
3612 DECL_INITIAL (decl) = 0;
3615 /* Compute and store the initial value. */
3616 if (TREE_CODE (decl) != FUNCTION_DECL)
3617 expand_decl_init (decl);
3621 if (TREE_CODE (decl) == TYPE_DECL)
3623 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3624 maybe_objc_check_decl (decl);
3625 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3629 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3630 /* This test used to include TREE_PERMANENT, however, we have the same
3631 problem with initializers at the function level. Such initializers get
3632 saved until the end of the function on the momentary_obstack. */
3633 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3635 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3636 space with DECL_ARG_TYPE. */
3637 && TREE_CODE (decl) != PARM_DECL)
3639 /* We need to remember that this array HAD an initialization,
3640 but discard the actual temporary nodes,
3641 since we can't have a permanent node keep pointing to them. */
3642 /* We make an exception for inline functions, since it's
3643 normal for a local extern redeclaration of an inline function
3644 to have a copy of the top-level decl's DECL_INLINE. */
3645 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3647 /* If this is a const variable, then preserve the
3648 initializer instead of discarding it so that we can optimize
3649 references to it. */
3650 /* This test used to include TREE_STATIC, but this won't be set
3651 for function level initializers. */
3652 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3654 preserve_initializer ();
3655 /* Hack? Set the permanent bit for something that is permanent,
3656 but not on the permanent obstack, so as to convince
3657 output_constant_def to make its rtl on the permanent
3659 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3661 /* The initializer and DECL must have the same (or equivalent
3662 types), but if the initializer is a STRING_CST, its type
3663 might not be on the right obstack, so copy the type
3665 TREE_TYPE (DECL_INITIAL (decl)) = type;
3668 DECL_INITIAL (decl) = error_mark_node;
3672 /* If requested, warn about definitions of large data objects. */
3674 if (warn_larger_than
3675 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3676 && !DECL_EXTERNAL (decl))
3678 register tree decl_size = DECL_SIZE (decl);
3680 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3682 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3684 if (units > larger_than_size)
3685 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3690 /* Resume permanent allocation, if not within a function. */
3691 /* The corresponding push_obstacks_nochange is in start_decl,
3692 and in push_parm_decl and in grokfield. */
3696 /* If we have gone back from temporary to permanent allocation,
3697 actually free the temporary space that we no longer need. */
3698 if (temporary && !allocation_temporary_p ())
3699 permanent_allocation (0);
3701 /* At the end of a declaration, throw away any variable type sizes
3702 of types defined inside that declaration. There is no use
3703 computing them in the following function definition. */
3704 if (current_binding_level == global_binding_level)
3705 get_pending_sizes ();
3708 /* If DECL has a cleanup, build and return that cleanup here.
3709 This is a callback called by expand_expr. */
3712 maybe_build_cleanup (decl)
3713 tree decl ATTRIBUTE_UNUSED;
3715 /* There are no cleanups in C. */
3719 /* Given a parsed parameter declaration,
3720 decode it into a PARM_DECL and push that on the current binding level.
3721 Also, for the sake of forward parm decls,
3722 record the given order of parms in `parm_order'. */
3725 push_parm_decl (parm)
3729 int old_immediate_size_expand = immediate_size_expand;
3730 /* Don't try computing parm sizes now -- wait till fn is called. */
3731 immediate_size_expand = 0;
3733 /* The corresponding pop_obstacks is in finish_decl. */
3734 push_obstacks_nochange ();
3736 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3737 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3738 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3739 TREE_PURPOSE (TREE_VALUE (parm)));
3742 if (DECL_NAME (decl))
3745 olddecl = lookup_name (DECL_NAME (decl));
3746 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3747 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3751 decl = pushdecl (decl);
3753 immediate_size_expand = old_immediate_size_expand;
3755 current_binding_level->parm_order
3756 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3758 /* Add this decl to the current binding level. */
3759 finish_decl (decl, NULL_TREE, NULL_TREE);
3762 /* Clear the given order of parms in `parm_order'.
3763 Used at start of parm list,
3764 and also at semicolon terminating forward decls. */
3769 current_binding_level->parm_order = NULL_TREE;
3772 /* Make TYPE a complete type based on INITIAL_VALUE.
3773 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3774 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3777 complete_array_type (type, initial_value, do_default)
3782 register tree maxindex = NULL_TREE;
3787 /* Note MAXINDEX is really the maximum index,
3788 one less than the size. */
3789 if (TREE_CODE (initial_value) == STRING_CST)
3792 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3793 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3796 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3798 tree elts = CONSTRUCTOR_ELTS (initial_value);
3799 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3800 for (; elts; elts = TREE_CHAIN (elts))
3802 if (TREE_PURPOSE (elts))
3803 maxindex = TREE_PURPOSE (elts);
3805 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3807 maxindex = copy_node (maxindex);
3811 /* Make an error message unless that happened already. */
3812 if (initial_value != error_mark_node)
3815 /* Prevent further error messages. */
3816 maxindex = build_int_2 (0, 0);
3823 maxindex = build_int_2 (0, 0);
3829 TYPE_DOMAIN (type) = build_index_type (maxindex);
3830 if (!TREE_TYPE (maxindex))
3831 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3834 /* Lay out the type now that we can get the real answer. */
3841 /* Given declspecs and a declarator,
3842 determine the name and type of the object declared
3843 and construct a ..._DECL node for it.
3844 (In one case we can return a ..._TYPE node instead.
3845 For invalid input we sometimes return 0.)
3847 DECLSPECS is a chain of tree_list nodes whose value fields
3848 are the storage classes and type specifiers.
3850 DECL_CONTEXT says which syntactic context this declaration is in:
3851 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3852 FUNCDEF for a function definition. Like NORMAL but a few different
3853 error messages in each case. Return value may be zero meaning
3854 this definition is too screwy to try to parse.
3855 PARM for a parameter declaration (either within a function prototype
3856 or before a function body). Make a PARM_DECL, or return void_type_node.
3857 TYPENAME if for a typename (in a cast or sizeof).
3858 Don't make a DECL node; just return the ..._TYPE node.
3859 FIELD for a struct or union field; make a FIELD_DECL.
3860 BITFIELD for a field with specified width.
3861 INITIALIZED is 1 if the decl has an initializer.
3863 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3864 It may also be so in the PARM case, for a prototype where the
3865 argument type is specified but not the name.
3867 This function is where the complicated C meanings of `static'
3868 and `extern' are interpreted. */
3871 grokdeclarator (declarator, declspecs, decl_context, initialized)
3874 enum decl_context decl_context;
3879 tree type = NULL_TREE;
3884 int type_quals = TYPE_UNQUALIFIED;
3886 int explicit_int = 0;
3887 int explicit_char = 0;
3888 int defaulted_int = 0;
3889 tree typedef_decl = 0;
3891 tree typedef_type = 0;
3892 int funcdef_flag = 0;
3893 enum tree_code innermost_code = ERROR_MARK;
3895 int size_varies = 0;
3896 tree decl_machine_attr = NULL_TREE;
3898 if (decl_context == BITFIELD)
3899 bitfield = 1, decl_context = FIELD;
3901 if (decl_context == FUNCDEF)
3902 funcdef_flag = 1, decl_context = NORMAL;
3904 push_obstacks_nochange ();
3906 if (flag_traditional && allocation_temporary_p ())
3907 end_temporary_allocation ();
3909 /* Look inside a declarator for the name being declared
3910 and get it as a string, for an error message. */
3912 register tree decl = declarator;
3916 switch (TREE_CODE (decl))
3921 innermost_code = TREE_CODE (decl);
3922 decl = TREE_OPERAND (decl, 0);
3925 case IDENTIFIER_NODE:
3926 name = IDENTIFIER_POINTER (decl);
3937 /* A function definition's declarator must have the form of
3938 a function declarator. */
3940 if (funcdef_flag && innermost_code != CALL_EXPR)
3943 /* Anything declared one level down from the top level
3944 must be one of the parameters of a function
3945 (because the body is at least two levels down). */
3947 /* If this looks like a function definition, make it one,
3948 even if it occurs where parms are expected.
3949 Then store_parm_decls will reject it and not use it as a parm. */
3950 if (decl_context == NORMAL && !funcdef_flag
3951 && current_binding_level->parm_flag)
3952 decl_context = PARM;
3954 /* Look through the decl specs and record which ones appear.
3955 Some typespecs are defined as built-in typenames.
3956 Others, the ones that are modifiers of other types,
3957 are represented by bits in SPECBITS: set the bits for
3958 the modifiers that appear. Storage class keywords are also in SPECBITS.
3960 If there is a typedef name or a type, store the type in TYPE.
3961 This includes builtin typedefs such as `int'.
3963 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3964 and did not come from a user typedef.
3966 Set LONGLONG if `long' is mentioned twice. */
3968 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3971 register tree id = TREE_VALUE (spec);
3973 if (id == ridpointers[(int) RID_INT])
3975 if (id == ridpointers[(int) RID_CHAR])
3978 if (TREE_CODE (id) == IDENTIFIER_NODE)
3979 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3981 if (ridpointers[i] == id)
3983 if (i == (int) RID_LONG && specbits & (1<<i))
3986 error ("`long long long' is too long for GCC");
3989 if (pedantic && ! in_system_header && warn_long_long)
3990 pedwarn ("ANSI C does not support `long long'");
3994 else if (specbits & (1 << i))
3995 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4001 error ("two or more data types in declaration of `%s'", name);
4002 /* Actual typedefs come to us as TYPE_DECL nodes. */
4003 else if (TREE_CODE (id) == TYPE_DECL)
4005 type = TREE_TYPE (id);
4006 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4009 /* Built-in types come as identifiers. */
4010 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4012 register tree t = lookup_name (id);
4013 if (TREE_TYPE (t) == error_mark_node)
4015 else if (!t || TREE_CODE (t) != TYPE_DECL)
4016 error ("`%s' fails to be a typedef or built in type",
4017 IDENTIFIER_POINTER (id));
4020 type = TREE_TYPE (t);
4024 else if (TREE_CODE (id) != ERROR_MARK)
4030 typedef_type = type;
4032 size_varies = C_TYPE_VARIABLE_SIZE (type);
4034 /* No type at all: default to `int', and set DEFAULTED_INT
4035 because it was not a user-defined typedef. */
4039 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4040 | (1 << (int) RID_SIGNED)
4041 | (1 << (int) RID_UNSIGNED))))
4042 /* Don't warn about typedef foo = bar. */
4043 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4044 && ! (in_system_header && ! allocation_temporary_p ()))
4046 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4047 and this is a function, or if -Wimplicit; prefer the former
4048 warning since it is more explicit. */
4049 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4050 warn_about_return_type = 1;
4051 else if (warn_implicit_int || flag_isoc9x)
4052 warning ("type defaults to `int' in declaration of `%s'", name);
4056 type = integer_type_node;
4059 /* Now process the modifiers that were specified
4060 and check for invalid combinations. */
4062 /* Long double is a special combination. */
4064 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4065 && TYPE_MAIN_VARIANT (type) == double_type_node)
4067 specbits &= ~ (1 << (int) RID_LONG);
4068 type = long_double_type_node;
4071 /* Check all other uses of type modifiers. */
4073 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4074 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4078 if ((specbits & 1 << (int) RID_LONG)
4079 && (specbits & 1 << (int) RID_SHORT))
4080 error ("both long and short specified for `%s'", name);
4081 else if (((specbits & 1 << (int) RID_LONG)
4082 || (specbits & 1 << (int) RID_SHORT))
4084 error ("long or short specified with char for `%s'", name);
4085 else if (((specbits & 1 << (int) RID_LONG)
4086 || (specbits & 1 << (int) RID_SHORT))
4087 && TREE_CODE (type) == REAL_TYPE)
4089 static int already = 0;
4091 error ("long or short specified with floating type for `%s'", name);
4092 if (! already && ! pedantic)
4094 error ("the only valid combination is `long double'");
4098 else if ((specbits & 1 << (int) RID_SIGNED)
4099 && (specbits & 1 << (int) RID_UNSIGNED))
4100 error ("both signed and unsigned specified for `%s'", name);
4101 else if (TREE_CODE (type) != INTEGER_TYPE)
4102 error ("long, short, signed or unsigned invalid for `%s'", name);
4106 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4108 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4110 if (flag_pedantic_errors)
4115 /* Discard the type modifiers if they are invalid. */
4118 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4119 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4124 if ((specbits & (1 << (int) RID_COMPLEX))
4125 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4127 error ("complex invalid for `%s'", name);
4128 specbits &= ~ (1 << (int) RID_COMPLEX);
4131 /* Decide whether an integer type is signed or not.
4132 Optionally treat bitfields as signed by default. */
4133 if (specbits & 1 << (int) RID_UNSIGNED
4134 /* Traditionally, all bitfields are unsigned. */
4135 || (bitfield && flag_traditional
4136 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4137 || (bitfield && ! flag_signed_bitfields
4138 && (explicit_int || defaulted_int || explicit_char
4139 /* A typedef for plain `int' without `signed'
4140 can be controlled just like plain `int'. */
4141 || ! (typedef_decl != 0
4142 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4143 && TREE_CODE (type) != ENUMERAL_TYPE
4144 && !(specbits & 1 << (int) RID_SIGNED)))
4147 type = long_long_unsigned_type_node;
4148 else if (specbits & 1 << (int) RID_LONG)
4149 type = long_unsigned_type_node;
4150 else if (specbits & 1 << (int) RID_SHORT)
4151 type = short_unsigned_type_node;
4152 else if (type == char_type_node)
4153 type = unsigned_char_type_node;
4154 else if (typedef_decl)
4155 type = unsigned_type (type);
4157 type = unsigned_type_node;
4159 else if ((specbits & 1 << (int) RID_SIGNED)
4160 && type == char_type_node)
4161 type = signed_char_type_node;
4163 type = long_long_integer_type_node;
4164 else if (specbits & 1 << (int) RID_LONG)
4165 type = long_integer_type_node;
4166 else if (specbits & 1 << (int) RID_SHORT)
4167 type = short_integer_type_node;
4169 if (specbits & 1 << (int) RID_COMPLEX)
4171 /* If we just have "complex", it is equivalent to
4172 "complex double", but if any modifiers at all are specified it is
4173 the complex form of TYPE. E.g, "complex short" is
4174 "complex short int". */
4176 if (defaulted_int && ! longlong
4177 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4178 | (1 << (int) RID_SIGNED)
4179 | (1 << (int) RID_UNSIGNED))))
4180 type = complex_double_type_node;
4181 else if (type == integer_type_node)
4182 type = complex_integer_type_node;
4183 else if (type == float_type_node)
4184 type = complex_float_type_node;
4185 else if (type == double_type_node)
4186 type = complex_double_type_node;
4187 else if (type == long_double_type_node)
4188 type = complex_long_double_type_node;
4190 type = build_complex_type (type);
4193 /* Figure out the type qualifiers for the declaration. There are
4194 two ways a declaration can become qualified. One is something
4195 like `const int i' where the `const' is explicit. Another is
4196 something like `typedef const int CI; CI i' where the type of the
4197 declaration contains the `const'. */
4198 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4199 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4200 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4201 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4203 pedwarn ("duplicate `const'");
4205 pedwarn ("duplicate `restrict'");
4207 pedwarn ("duplicate `volatile'");
4208 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4209 type = TYPE_MAIN_VARIANT (type);
4210 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4211 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4212 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4214 /* Warn if two storage classes are given. Default to `auto'. */
4219 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4220 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4221 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4222 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4223 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4224 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4226 /* Warn about storage classes that are invalid for certain
4227 kinds of declarations (parameters, typenames, etc.). */
4230 error ("multiple storage classes in declaration of `%s'", name);
4231 else if (funcdef_flag
4233 & ((1 << (int) RID_REGISTER)
4234 | (1 << (int) RID_AUTO)
4235 | (1 << (int) RID_TYPEDEF))))
4237 if (specbits & 1 << (int) RID_AUTO
4238 && (pedantic || current_binding_level == global_binding_level))
4239 pedwarn ("function definition declared `auto'");
4240 if (specbits & 1 << (int) RID_REGISTER)
4241 error ("function definition declared `register'");
4242 if (specbits & 1 << (int) RID_TYPEDEF)
4243 error ("function definition declared `typedef'");
4244 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4245 | (1 << (int) RID_AUTO));
4247 else if (decl_context != NORMAL && nclasses > 0)
4249 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4253 error ((decl_context == FIELD
4254 ? "storage class specified for structure field `%s'"
4255 : (decl_context == PARM
4256 ? "storage class specified for parameter `%s'"
4257 : "storage class specified for typename")),
4259 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4260 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4261 | (1 << (int) RID_EXTERN));
4264 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4266 /* `extern' with initialization is invalid if not at top level. */
4267 if (current_binding_level == global_binding_level)
4268 warning ("`%s' initialized and declared `extern'", name);
4270 error ("`%s' has both `extern' and initializer", name);
4272 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4273 && current_binding_level != global_binding_level)
4274 error ("nested function `%s' declared `extern'", name);
4275 else if (current_binding_level == global_binding_level
4276 && specbits & (1 << (int) RID_AUTO))
4277 error ("top-level declaration of `%s' specifies `auto'", name);
4278 else if ((specbits & 1 << (int) RID_ITERATOR)
4279 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4281 error ("iterator `%s' has derived type", name);
4282 type = error_mark_node;
4284 else if ((specbits & 1 << (int) RID_ITERATOR)
4285 && TREE_CODE (type) != INTEGER_TYPE)
4287 error ("iterator `%s' has noninteger type", name);
4288 type = error_mark_node;
4292 /* Now figure out the structure of the declarator proper.
4293 Descend through it, creating more complex types, until we reach
4294 the declared identifier (or NULL_TREE, in an absolute declarator). */
4296 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4298 if (type == error_mark_node)
4300 declarator = TREE_OPERAND (declarator, 0);
4304 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4305 an INDIRECT_REF (for *...),
4306 a CALL_EXPR (for ...(...)),
4307 an identifier (for the name being declared)
4308 or a null pointer (for the place in an absolute declarator
4309 where the name was omitted).
4310 For the last two cases, we have just exited the loop.
4312 At this point, TYPE is the type of elements of an array,
4313 or for a function to return, or for a pointer to point to.
4314 After this sequence of ifs, TYPE is the type of the
4315 array or function or pointer, and DECLARATOR has had its
4316 outermost layer removed. */
4318 if (TREE_CODE (declarator) == ARRAY_REF)
4320 register tree itype = NULL_TREE;
4321 register tree size = TREE_OPERAND (declarator, 1);
4322 /* An uninitialized decl with `extern' is a reference. */
4323 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4324 /* The index is a signed object `sizetype' bits wide. */
4325 tree index_type = signed_type (sizetype);
4327 declarator = TREE_OPERAND (declarator, 0);
4329 /* Check for some types that there cannot be arrays of. */
4331 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4333 error ("declaration of `%s' as array of voids", name);
4334 type = error_mark_node;
4337 if (TREE_CODE (type) == FUNCTION_TYPE)
4339 error ("declaration of `%s' as array of functions", name);
4340 type = error_mark_node;
4343 if (size == error_mark_node)
4344 type = error_mark_node;
4346 if (type == error_mark_node)
4349 /* If this is a block level extern, it must live past the end
4350 of the function so that we can check it against other extern
4351 declarations (IDENTIFIER_LIMBO_VALUE). */
4352 if (extern_ref && allocation_temporary_p ())
4353 end_temporary_allocation ();
4355 /* If size was specified, set ITYPE to a range-type for that size.
4356 Otherwise, ITYPE remains null. finish_decl may figure it out
4357 from an initial value. */
4361 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4362 STRIP_TYPE_NOPS (size);
4364 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4365 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4367 error ("size of array `%s' has non-integer type", name);
4368 size = integer_one_node;
4371 if (pedantic && integer_zerop (size))
4372 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4374 if (TREE_CODE (size) == INTEGER_CST)
4376 constant_expression_warning (size);
4377 if (tree_int_cst_sgn (size) < 0)
4379 error ("size of array `%s' is negative", name);
4380 size = integer_one_node;
4385 /* Make sure the array size remains visibly nonconstant
4386 even if it is (eg) a const variable with known value. */
4391 if (TREE_CONSTANT (size))
4392 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4394 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4398 /* Convert size to index_type, so that if it is a variable
4399 the computations will be done in the proper mode. */
4400 itype = fold (build (MINUS_EXPR, index_type,
4401 convert (index_type, size),
4402 convert (index_type, size_one_node)));
4404 /* If that overflowed, the array is too big.
4405 ??? While a size of INT_MAX+1 technically shouldn't cause
4406 an overflow (because we subtract 1), the overflow is recorded
4407 during the conversion to index_type, before the subtraction.
4408 Handling this case seems like an unnecessary complication. */
4409 if (TREE_OVERFLOW (itype))
4411 error ("size of array `%s' is too large", name);
4412 type = error_mark_node;
4417 itype = variable_size (itype);
4418 itype = build_index_type (itype);
4421 #if 0 /* This had bad results for pointers to arrays, as in
4422 union incomplete (*foo)[4]; */
4423 /* Complain about arrays of incomplete types, except in typedefs. */
4425 if (TYPE_SIZE (type) == 0
4426 /* Avoid multiple warnings for nested array types. */
4427 && TREE_CODE (type) != ARRAY_TYPE
4428 && !(specbits & (1 << (int) RID_TYPEDEF))
4429 && !C_TYPE_BEING_DEFINED (type))
4430 warning ("array type has incomplete element type");
4433 #if 0 /* We shouldn't have a function type here at all!
4434 Functions aren't allowed as array elements. */
4435 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4436 && (constp || volatilep))
4437 pedwarn ("ANSI C forbids const or volatile function types");
4440 /* Build the array type itself, then merge any constancy or
4441 volatility into the target type. We must do it in this order
4442 to ensure that the TYPE_MAIN_VARIANT field of the array type
4443 is set correctly. */
4445 type = build_array_type (type, itype);
4447 type = c_build_qualified_type (type, type_quals);
4449 #if 0 /* don't clear these; leave them set so that the array type
4450 or the variable is itself const or volatile. */
4451 type_quals = TYPE_UNQUALIFIED;
4455 C_TYPE_VARIABLE_SIZE (type) = 1;
4457 else if (TREE_CODE (declarator) == CALL_EXPR)
4459 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4460 || current_binding_level == global_binding_level);
4463 /* Declaring a function type.
4464 Make sure we have a valid type for the function to return. */
4465 if (type == error_mark_node)
4470 /* Warn about some types functions can't return. */
4472 if (TREE_CODE (type) == FUNCTION_TYPE)
4474 error ("`%s' declared as function returning a function", name);
4475 type = integer_type_node;
4477 if (TREE_CODE (type) == ARRAY_TYPE)
4479 error ("`%s' declared as function returning an array", name);
4480 type = integer_type_node;
4483 #ifndef TRADITIONAL_RETURN_FLOAT
4484 /* Traditionally, declaring return type float means double. */
4486 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4487 type = double_type_node;
4488 #endif /* TRADITIONAL_RETURN_FLOAT */
4490 /* If this is a block level extern, it must live past the end
4491 of the function so that we can check it against other extern
4492 declarations (IDENTIFIER_LIMBO_VALUE). */
4493 if (extern_ref && allocation_temporary_p ())
4494 end_temporary_allocation ();
4496 /* Construct the function type and go to the next
4497 inner layer of declarator. */
4499 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4501 /* Say it's a definition
4502 only for the CALL_EXPR
4503 closest to the identifier. */
4504 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4505 #if 0 /* This seems to be false. We turn off temporary allocation
4506 above in this function if -traditional.
4507 And this code caused inconsistent results with prototypes:
4508 callers would ignore them, and pass arguments wrong. */
4510 /* Omit the arg types if -traditional, since the arg types
4511 and the list links might not be permanent. */
4512 type = build_function_type (type,
4514 ? NULL_TREE : arg_types);
4516 /* Type qualifiers before the return type of the function
4517 qualify the return type, not the function type. */
4519 type = c_build_qualified_type (type, type_quals);
4520 type_quals = TYPE_UNQUALIFIED;
4522 type = build_function_type (type, arg_types);
4523 declarator = TREE_OPERAND (declarator, 0);
4525 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4526 the formal parameter list of this FUNCTION_TYPE to point to
4527 the FUNCTION_TYPE node itself. */
4532 for (link = last_function_parm_tags;
4534 link = TREE_CHAIN (link))
4535 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4538 else if (TREE_CODE (declarator) == INDIRECT_REF)
4540 /* Merge any constancy or volatility into the target type
4543 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4545 pedwarn ("ANSI C forbids qualified function types");
4547 type = c_build_qualified_type (type, type_quals);
4548 type_quals = TYPE_UNQUALIFIED;
4551 type = build_pointer_type (type);
4553 /* Process a list of type modifier keywords
4554 (such as const or volatile) that were given inside the `*'. */
4556 if (TREE_TYPE (declarator))
4558 register tree typemodlist;
4564 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4565 typemodlist = TREE_CHAIN (typemodlist))
4567 tree qualifier = TREE_VALUE (typemodlist);
4569 if (qualifier == ridpointers[(int) RID_CONST])
4571 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4573 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4578 error ("invalid type modifier within pointer declarator");
4582 pedwarn ("duplicate `const'");
4584 pedwarn ("duplicate `volatile'");
4586 pedwarn ("duplicate `restrict'");
4588 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4589 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4590 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4593 declarator = TREE_OPERAND (declarator, 0);
4600 /* Now TYPE has the actual type. */
4602 /* Did array size calculations overflow? */
4604 if (TREE_CODE (type) == ARRAY_TYPE
4606 && TREE_OVERFLOW (TYPE_SIZE (type)))
4607 error ("size of array `%s' is too large", name);
4609 /* If this is declaring a typedef name, return a TYPE_DECL. */
4611 if (specbits & (1 << (int) RID_TYPEDEF))
4614 /* Note that the grammar rejects storage classes
4615 in typenames, fields or parameters */
4616 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4618 pedwarn ("ANSI C forbids qualified function types");
4620 type = c_build_qualified_type (type, type_quals);
4621 decl = build_decl (TYPE_DECL, declarator, type);
4622 if ((specbits & (1 << (int) RID_SIGNED))
4623 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4624 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4629 /* Detect the case of an array type of unspecified size
4630 which came, as such, direct from a typedef name.
4631 We must copy the type, so that each identifier gets
4632 a distinct type, so that each identifier's size can be
4633 controlled separately by its own initializer. */
4635 if (type != 0 && typedef_type != 0
4636 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4637 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4639 type = build_array_type (TREE_TYPE (type), 0);
4641 C_TYPE_VARIABLE_SIZE (type) = 1;
4644 /* If this is a type name (such as, in a cast or sizeof),
4645 compute the type and return it now. */
4647 if (decl_context == TYPENAME)
4649 /* Note that the grammar rejects storage classes
4650 in typenames, fields or parameters */
4651 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4653 pedwarn ("ANSI C forbids const or volatile function types");
4655 type = c_build_qualified_type (type, type_quals);
4660 /* Aside from typedefs and type names (handle above),
4661 `void' at top level (not within pointer)
4662 is allowed only in public variables.
4663 We don't complain about parms either, but that is because
4664 a better error message can be made later. */
4666 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4667 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4668 && ((specbits & (1 << (int) RID_EXTERN))
4669 || (current_binding_level == global_binding_level
4671 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4673 error ("variable or field `%s' declared void", name);
4674 type = integer_type_node;
4677 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4678 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4683 if (decl_context == PARM)
4685 tree type_as_written = type;
4688 /* A parameter declared as an array of T is really a pointer to T.
4689 One declared as a function is really a pointer to a function. */
4691 if (TREE_CODE (type) == ARRAY_TYPE)
4693 /* Transfer const-ness of array into that of type pointed to. */
4694 type = TREE_TYPE (type);
4696 type = c_build_qualified_type (type, type_quals);
4697 type = build_pointer_type (type);
4698 type_quals = TYPE_UNQUALIFIED;
4701 else if (TREE_CODE (type) == FUNCTION_TYPE)
4703 if (pedantic && type_quals)
4704 pedwarn ("ANSI C forbids qualified function types");
4706 type = c_build_qualified_type (type, type_quals);
4707 type = build_pointer_type (type);
4708 type_quals = TYPE_UNQUALIFIED;
4711 decl = build_decl (PARM_DECL, declarator, type);
4713 C_DECL_VARIABLE_SIZE (decl) = 1;
4715 /* Compute the type actually passed in the parmlist,
4716 for the case where there is no prototype.
4717 (For example, shorts and chars are passed as ints.)
4718 When there is a prototype, this is overridden later. */
4720 if (type == error_mark_node)
4721 promoted_type = type;
4724 promoted_type = simple_type_promotes_to (type);
4725 if (! promoted_type)
4726 promoted_type = type;
4729 DECL_ARG_TYPE (decl) = promoted_type;
4730 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4732 else if (decl_context == FIELD)
4734 /* Structure field. It may not be a function. */
4736 if (TREE_CODE (type) == FUNCTION_TYPE)
4738 error ("field `%s' declared as a function", name);
4739 type = build_pointer_type (type);
4741 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4743 error ("field `%s' has incomplete type", name);
4744 type = error_mark_node;
4746 /* Move type qualifiers down to element of an array. */
4747 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4749 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4751 TYPE_DOMAIN (type));
4752 #if 0 /* Leave the field const or volatile as well. */
4753 type_quals = TYPE_UNQUALIFIED;
4756 decl = build_decl (FIELD_DECL, declarator, type);
4758 C_DECL_VARIABLE_SIZE (decl) = 1;
4760 else if (TREE_CODE (type) == FUNCTION_TYPE)
4762 /* Every function declaration is "external"
4763 except for those which are inside a function body
4764 in which `auto' is used.
4765 That is a case not specified by ANSI C,
4766 and we use it for forward declarations for nested functions. */
4767 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4768 || current_binding_level == global_binding_level);
4770 if (specbits & (1 << (int) RID_AUTO)
4771 && (pedantic || current_binding_level == global_binding_level))
4772 pedwarn ("invalid storage class for function `%s'", name);
4773 if (specbits & (1 << (int) RID_REGISTER))
4774 error ("invalid storage class for function `%s'", name);
4775 /* Function declaration not at top level.
4776 Storage classes other than `extern' are not allowed
4777 and `extern' makes no difference. */
4778 if (current_binding_level != global_binding_level
4779 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4781 pedwarn ("invalid storage class for function `%s'", name);
4783 /* If this is a block level extern, it must live past the end
4784 of the function so that we can check it against other
4785 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4786 if (extern_ref && allocation_temporary_p ())
4787 end_temporary_allocation ();
4789 decl = build_decl (FUNCTION_DECL, declarator, type);
4790 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4792 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4793 pedwarn ("ANSI C forbids qualified function types");
4796 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4797 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4798 && ! DECL_IN_SYSTEM_HEADER (decl))
4799 pedwarn ("ANSI C forbids qualified void function return type");
4801 /* GNU C interprets a `volatile void' return type to indicate
4802 that the function does not return. */
4803 if ((type_quals & TYPE_QUAL_VOLATILE)
4804 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4805 warning ("`noreturn' function returns non-void value");
4808 DECL_EXTERNAL (decl) = 1;
4809 /* Record absence of global scope for `static' or `auto'. */
4811 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4813 /* Record presence of `inline', if it is reasonable. */
4816 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4817 warning ("cannot inline function `main'");
4819 /* Assume that otherwise the function can be inlined. */
4820 DECL_INLINE (decl) = 1;
4822 if (specbits & (1 << (int) RID_EXTERN))
4823 current_extern_inline = 1;
4828 /* It's a variable. */
4829 /* An uninitialized decl with `extern' is a reference. */
4830 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4832 /* Move type qualifiers down to element of an array. */
4833 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4835 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4837 TYPE_DOMAIN (type));
4838 #if 0 /* Leave the variable const or volatile as well. */
4839 type_quals = TYPE_UNQUALIFIED;
4843 /* If this is a block level extern, it must live past the end
4844 of the function so that we can check it against other
4845 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4846 if (extern_ref && allocation_temporary_p ())
4847 end_temporary_allocation ();
4849 decl = build_decl (VAR_DECL, declarator, type);
4851 C_DECL_VARIABLE_SIZE (decl) = 1;
4854 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4856 DECL_EXTERNAL (decl) = extern_ref;
4857 /* At top level, the presence of a `static' or `register' storage
4858 class specifier, or the absence of all storage class specifiers
4859 makes this declaration a definition (perhaps tentative). Also,
4860 the absence of both `static' and `register' makes it public. */
4861 if (current_binding_level == global_binding_level)
4865 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4866 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4868 /* Not at top level, only `static' makes a static definition. */
4871 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4872 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4875 if (specbits & 1 << (int) RID_ITERATOR)
4876 ITERATOR_P (decl) = 1;
4879 /* Record `register' declaration for warnings on &
4880 and in case doing stupid register allocation. */
4882 if (specbits & (1 << (int) RID_REGISTER))
4883 DECL_REGISTER (decl) = 1;
4885 /* Record constancy and volatility. */
4886 c_apply_type_quals_to_decl (type_quals, decl);
4888 /* If a type has volatile components, it should be stored in memory.
4889 Otherwise, the fact that those components are volatile
4890 will be ignored, and would even crash the compiler. */
4891 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4892 mark_addressable (decl);
4900 /* Decode the parameter-list info for a function type or function definition.
4901 The argument is the value returned by `get_parm_info' (or made in parse.y
4902 if there is an identifier list instead of a parameter decl list).
4903 These two functions are separate because when a function returns
4904 or receives functions then each is called multiple times but the order
4905 of calls is different. The last call to `grokparms' is always the one
4906 that contains the formal parameter names of a function definition.
4908 Store in `last_function_parms' a chain of the decls of parms.
4909 Also store in `last_function_parm_tags' a chain of the struct, union,
4910 and enum tags declared among the parms.
4912 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4914 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4915 a mere declaration. A nonempty identifier-list gets an error message
4916 when FUNCDEF_FLAG is zero. */
4919 grokparms (parms_info, funcdef_flag)
4923 tree first_parm = TREE_CHAIN (parms_info);
4925 last_function_parms = TREE_PURPOSE (parms_info);
4926 last_function_parm_tags = TREE_VALUE (parms_info);
4928 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4929 && !in_system_header)
4930 warning ("function declaration isn't a prototype");
4933 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4936 pedwarn ("parameter names (without types) in function declaration");
4938 last_function_parms = first_parm;
4945 /* We no longer test FUNCDEF_FLAG.
4946 If the arg types are incomplete in a declaration,
4947 they must include undefined tags.
4948 These tags can never be defined in the scope of the declaration,
4949 so the types can never be completed,
4950 and no call can be compiled successfully. */
4952 /* In a fcn definition, arg types must be complete. */
4955 for (parm = last_function_parms, typelt = first_parm;
4957 parm = TREE_CHAIN (parm))
4958 /* Skip over any enumeration constants declared here. */
4959 if (TREE_CODE (parm) == PARM_DECL)
4961 /* Barf if the parameter itself has an incomplete type. */
4962 tree type = TREE_VALUE (typelt);
4963 if (TYPE_SIZE (type) == 0)
4965 if (funcdef_flag && DECL_NAME (parm) != 0)
4966 error ("parameter `%s' has incomplete type",
4967 IDENTIFIER_POINTER (DECL_NAME (parm)));
4969 warning ("parameter has incomplete type");
4972 TREE_VALUE (typelt) = error_mark_node;
4973 TREE_TYPE (parm) = error_mark_node;
4976 #if 0 /* This has been replaced by parm_tags_warning
4977 which uses a more accurate criterion for what to warn about. */
4980 /* Now warn if is a pointer to an incomplete type. */
4981 while (TREE_CODE (type) == POINTER_TYPE
4982 || TREE_CODE (type) == REFERENCE_TYPE)
4983 type = TREE_TYPE (type);
4984 type = TYPE_MAIN_VARIANT (type);
4985 if (TYPE_SIZE (type) == 0)
4987 if (DECL_NAME (parm) != 0)
4988 warning ("parameter `%s' points to incomplete type",
4989 IDENTIFIER_POINTER (DECL_NAME (parm)));
4991 warning ("parameter points to incomplete type");
4995 typelt = TREE_CHAIN (typelt);
4998 /* Allocate the list of types the way we allocate a type. */
4999 if (first_parm && ! TREE_PERMANENT (first_parm))
5001 /* Construct a copy of the list of types
5002 on the saveable obstack. */
5004 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5005 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5007 return nreverse (result);
5010 /* The list we have is permanent already. */
5016 /* Return a tree_list node with info on a parameter list just parsed.
5017 The TREE_PURPOSE is a chain of decls of those parms.
5018 The TREE_VALUE is a list of structure, union and enum tags defined.
5019 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5020 This tree_list node is later fed to `grokparms'.
5022 VOID_AT_END nonzero means append `void' to the end of the type-list.
5023 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5026 get_parm_info (void_at_end)
5029 register tree decl, t;
5030 register tree types = 0;
5032 tree tags = gettags ();
5033 tree parms = getdecls ();
5035 tree order = current_binding_level->parm_order;
5037 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5038 if (void_at_end && parms != 0
5039 && TREE_CHAIN (parms) == 0
5040 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5041 && DECL_NAME (parms) == 0)
5044 storedecls (NULL_TREE);
5045 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5046 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5049 /* Extract enumerator values and other non-parms declared with the parms.
5050 Likewise any forward parm decls that didn't have real parm decls. */
5051 for (decl = parms; decl; )
5053 tree next = TREE_CHAIN (decl);
5055 if (TREE_CODE (decl) != PARM_DECL)
5057 TREE_CHAIN (decl) = new_parms;
5060 else if (TREE_ASM_WRITTEN (decl))
5062 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5063 TREE_CHAIN (decl) = new_parms;
5069 /* Put the parm decls back in the order they were in in the parm list. */
5070 for (t = order; t; t = TREE_CHAIN (t))
5073 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5075 TREE_CHAIN (TREE_VALUE (t)) = 0;
5078 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5081 /* Store the parmlist in the binding level since the old one
5082 is no longer a valid list. (We have changed the chain pointers.) */
5083 storedecls (new_parms);
5085 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5086 /* There may also be declarations for enumerators if an enumeration
5087 type is declared among the parms. Ignore them here. */
5088 if (TREE_CODE (decl) == PARM_DECL)
5090 /* Since there is a prototype,
5091 args are passed in their declared types. */
5092 tree type = TREE_TYPE (decl);
5093 DECL_ARG_TYPE (decl) = type;
5094 if (PROMOTE_PROTOTYPES
5095 && (TREE_CODE (type) == INTEGER_TYPE
5096 || TREE_CODE (type) == ENUMERAL_TYPE)
5097 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5098 DECL_ARG_TYPE (decl) = integer_type_node;
5100 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5101 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5102 && DECL_NAME (decl) == 0)
5104 error ("`void' in parameter list must be the entire list");
5110 return saveable_tree_cons (new_parms, tags,
5111 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5113 return saveable_tree_cons (new_parms, tags, nreverse (types));
5116 /* At end of parameter list, warn about any struct, union or enum tags
5117 defined within. Do so because these types cannot ever become complete. */
5120 parmlist_tags_warning ()
5125 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5127 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5128 /* An anonymous union parm type is meaningful as a GNU extension.
5129 So don't warn for that. */
5130 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5132 if (TREE_PURPOSE (elt) != 0)
5133 warning ("`%s %s' declared inside parameter list",
5134 (code == RECORD_TYPE ? "struct"
5135 : code == UNION_TYPE ? "union"
5137 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5139 warning ("anonymous %s declared inside parameter list",
5140 (code == RECORD_TYPE ? "struct"
5141 : code == UNION_TYPE ? "union"
5146 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5152 /* Get the struct, enum or union (CODE says which) with tag NAME.
5153 Define the tag as a forward-reference if it is not defined. */
5156 xref_tag (code, name)
5157 enum tree_code code;
5160 int temporary = allocation_temporary_p ();
5162 /* If a cross reference is requested, look up the type
5163 already defined for this tag and return it. */
5165 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5166 /* Even if this is the wrong type of tag, return what we found.
5167 There will be an error message anyway, from pending_xref_error.
5168 If we create an empty xref just for an invalid use of the type,
5169 the main result is to create lots of superfluous error messages. */
5173 push_obstacks_nochange ();
5175 if (current_binding_level == global_binding_level && temporary)
5176 end_temporary_allocation ();
5178 /* If no such tag is yet defined, create a forward-reference node
5179 and record it as the "definition".
5180 When a real declaration of this type is found,
5181 the forward-reference will be altered into a real type. */
5183 ref = make_node (code);
5184 if (code == ENUMERAL_TYPE)
5186 /* (In ANSI, Enums can be referred to only if already defined.) */
5188 pedwarn ("ANSI C forbids forward references to `enum' types");
5189 /* Give the type a default layout like unsigned int
5190 to avoid crashing if it does not get defined. */
5191 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5192 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5193 TREE_UNSIGNED (ref) = 1;
5194 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5195 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5196 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5199 pushtag (name, ref);
5206 /* Make sure that the tag NAME is defined *in the current binding level*
5207 at least as a forward reference.
5208 CODE says which kind of tag NAME ought to be.
5210 We also do a push_obstacks_nochange
5211 whose matching pop is in finish_struct. */
5214 start_struct (code, name)
5215 enum tree_code code;
5218 /* If there is already a tag defined at this binding level
5219 (as a forward reference), just return it. */
5221 register tree ref = 0;
5223 push_obstacks_nochange ();
5224 if (current_binding_level == global_binding_level)
5225 end_temporary_allocation ();
5228 ref = lookup_tag (code, name, current_binding_level, 1);
5229 if (ref && TREE_CODE (ref) == code)
5231 C_TYPE_BEING_DEFINED (ref) = 1;
5232 TYPE_PACKED (ref) = flag_pack_struct;
5233 if (TYPE_FIELDS (ref))
5234 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5235 : "redefinition of `struct %s'"),
5236 IDENTIFIER_POINTER (name));
5241 /* Otherwise create a forward-reference just so the tag is in scope. */
5243 ref = make_node (code);
5244 pushtag (name, ref);
5245 C_TYPE_BEING_DEFINED (ref) = 1;
5246 TYPE_PACKED (ref) = flag_pack_struct;
5250 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5251 of a structure component, returning a FIELD_DECL node.
5252 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5254 This is done during the parsing of the struct declaration.
5255 The FIELD_DECL nodes are chained together and the lot of them
5256 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5259 grokfield (filename, line, declarator, declspecs, width)
5260 const char *filename ATTRIBUTE_UNUSED;
5261 int line ATTRIBUTE_UNUSED;
5262 tree declarator, declspecs, width;
5266 /* The corresponding pop_obstacks is in finish_decl. */
5267 push_obstacks_nochange ();
5269 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5271 finish_decl (value, NULL_TREE, NULL_TREE);
5272 DECL_INITIAL (value) = width;
5274 maybe_objc_check_decl (value);
5278 /* Function to help qsort sort FIELD_DECLs by name order. */
5281 field_decl_cmp (xp, yp)
5285 tree *x = (tree *)xp, *y = (tree *)yp;
5287 if (DECL_NAME (*x) == DECL_NAME (*y))
5289 if (DECL_NAME (*x) == NULL)
5291 if (DECL_NAME (*y) == NULL)
5293 if (DECL_NAME (*x) < DECL_NAME (*y))
5298 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5299 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5300 ATTRIBUTES are attributes to be applied to the structure.
5302 We also do a pop_obstacks to match the push in start_struct. */
5305 finish_struct (t, fieldlist, attributes)
5312 int toplevel = global_binding_level == current_binding_level;
5314 /* If this type was previously laid out as a forward reference,
5315 make sure we lay it out again. */
5319 decl_attributes (t, attributes, NULL_TREE);
5321 /* Nameless union parm types are useful as GCC extension. */
5322 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5323 /* Otherwise, warn about any struct or union def. in parmlist. */
5324 if (in_parm_level_p ())
5327 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5328 : "structure defined inside parms"));
5329 else if (! flag_traditional)
5330 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5331 : "structure defined inside parms"));
5334 old_momentary = suspend_momentary ();
5338 for (x = fieldlist; x; x = TREE_CHAIN (x))
5339 if (DECL_NAME (x) != 0)
5344 ? "%s has no named members"
5345 : "%s has no members"),
5346 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5349 /* Install struct as DECL_CONTEXT of each field decl.
5350 Also process specified field sizes.
5351 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5352 The specified size is found in the DECL_INITIAL.
5353 Store 0 there, except for ": 0" fields (so we can find them
5354 and delete them, below). */
5356 for (x = fieldlist; x; x = TREE_CHAIN (x))
5358 DECL_CONTEXT (x) = t;
5359 DECL_PACKED (x) |= TYPE_PACKED (t);
5360 DECL_FIELD_SIZE (x) = 0;
5362 /* If any field is const, the structure type is pseudo-const. */
5363 if (TREE_READONLY (x))
5364 C_TYPE_FIELDS_READONLY (t) = 1;
5367 /* A field that is pseudo-const makes the structure likewise. */
5368 tree t1 = TREE_TYPE (x);
5369 while (TREE_CODE (t1) == ARRAY_TYPE)
5370 t1 = TREE_TYPE (t1);
5371 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5372 && C_TYPE_FIELDS_READONLY (t1))
5373 C_TYPE_FIELDS_READONLY (t) = 1;
5376 /* Any field that is volatile means variables of this type must be
5377 treated in some ways as volatile. */
5378 if (TREE_THIS_VOLATILE (x))
5379 C_TYPE_FIELDS_VOLATILE (t) = 1;
5381 /* Any field of nominal variable size implies structure is too. */
5382 if (C_DECL_VARIABLE_SIZE (x))
5383 C_TYPE_VARIABLE_SIZE (t) = 1;
5385 /* Detect invalid nested redefinition. */
5386 if (TREE_TYPE (x) == t)
5387 error ("nested redefinition of `%s'",
5388 IDENTIFIER_POINTER (TYPE_NAME (t)));
5390 /* Detect invalid bit-field size. */
5391 if (DECL_INITIAL (x))
5392 STRIP_NOPS (DECL_INITIAL (x));
5393 if (DECL_INITIAL (x))
5395 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5396 constant_expression_warning (DECL_INITIAL (x));
5399 error_with_decl (x, "bit-field `%s' width not an integer constant");
5400 DECL_INITIAL (x) = NULL;
5404 /* Detect invalid bit-field type. */
5405 if (DECL_INITIAL (x)
5406 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5407 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5409 error_with_decl (x, "bit-field `%s' has invalid type");
5410 DECL_INITIAL (x) = NULL;
5412 if (DECL_INITIAL (x) && pedantic
5413 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5414 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5415 /* Accept an enum that's equivalent to int or unsigned int. */
5416 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5417 && (TYPE_PRECISION (TREE_TYPE (x))
5418 == TYPE_PRECISION (integer_type_node))))
5419 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5421 /* Detect and ignore out of range field width. */
5422 if (DECL_INITIAL (x))
5424 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5426 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5428 DECL_INITIAL (x) = NULL;
5429 error_with_decl (x, "negative width in bit-field `%s'");
5431 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5432 || width > TYPE_PRECISION (TREE_TYPE (x)))
5434 DECL_INITIAL (x) = NULL;
5435 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5437 else if (width == 0 && DECL_NAME (x) != 0)
5439 error_with_decl (x, "zero width for bit-field `%s'");
5440 DECL_INITIAL (x) = NULL;
5444 /* Process valid field width. */
5445 if (DECL_INITIAL (x))
5447 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5449 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5450 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5451 TREE_UNSIGNED (TREE_TYPE (x)))
5452 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5453 TREE_UNSIGNED (TREE_TYPE (x)))))
5454 warning_with_decl (x, "`%s' is narrower than values of its type");
5456 DECL_FIELD_SIZE (x) = width;
5457 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5458 DECL_INITIAL (x) = NULL;
5462 /* field size 0 => force desired amount of alignment. */
5463 #ifdef EMPTY_FIELD_BOUNDARY
5464 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5466 #ifdef PCC_BITFIELD_TYPE_MATTERS
5467 if (PCC_BITFIELD_TYPE_MATTERS)
5468 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5469 TYPE_ALIGN (TREE_TYPE (x)));
5473 else if (TREE_TYPE (x) != error_mark_node)
5475 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5476 : TYPE_ALIGN (TREE_TYPE (x)));
5477 /* Non-bit-fields are aligned for their type, except packed
5478 fields which require only BITS_PER_UNIT alignment. */
5479 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5483 /* Now DECL_INITIAL is null on all members. */
5485 /* Delete all duplicate fields from the fieldlist */
5486 for (x = fieldlist; x && TREE_CHAIN (x);)
5487 /* Anonymous fields aren't duplicates. */
5488 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5492 register tree y = fieldlist;
5496 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5502 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5504 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5505 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5507 else x = TREE_CHAIN (x);
5510 /* Now we have the nearly final fieldlist. Record it,
5511 then lay out the structure or union (including the fields). */
5513 TYPE_FIELDS (t) = fieldlist;
5517 /* Delete all zero-width bit-fields from the front of the fieldlist */
5519 && DECL_INITIAL (fieldlist))
5520 fieldlist = TREE_CHAIN (fieldlist);
5521 /* Delete all such members from the rest of the fieldlist */
5522 for (x = fieldlist; x;)
5524 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5525 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5526 else x = TREE_CHAIN (x);
5529 /* Now we have the truly final field list.
5530 Store it in this type and in the variants. */
5532 TYPE_FIELDS (t) = fieldlist;
5534 /* If there are lots of fields, sort so we can look through them fast.
5535 We arbitrarily consider 16 or more elts to be "a lot". */
5539 for (x = fieldlist; x; x = TREE_CHAIN (x))
5550 len += list_length (x);
5551 /* Use the same allocation policy here that make_node uses, to
5552 ensure that this lives as long as the rest of the struct decl.
5553 All decls in an inline function need to be saved. */
5555 space = ggc_alloc (sizeof (struct lang_type) + len * sizeof (tree));
5556 else if (allocation_temporary_p ())
5557 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5559 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5561 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5562 TYPE_LANG_SPECIFIC (t)->len = len;
5564 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5566 for (x = fieldlist; x; x = TREE_CHAIN (x))
5567 field_array[len++] = x;
5569 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5573 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5575 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5576 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5577 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5580 /* If this was supposed to be a transparent union, but we can't
5581 make it one, warn and turn off the flag. */
5582 if (TREE_CODE (t) == UNION_TYPE
5583 && TYPE_TRANSPARENT_UNION (t)
5584 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5586 TYPE_TRANSPARENT_UNION (t) = 0;
5587 warning ("union cannot be made transparent");
5590 /* If this structure or union completes the type of any previous
5591 variable declaration, lay it out and output its rtl. */
5593 if (current_binding_level->n_incomplete != 0)
5596 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5598 if (TREE_TYPE (decl) == t
5599 && TREE_CODE (decl) != TYPE_DECL)
5601 layout_decl (decl, 0);
5602 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5603 maybe_objc_check_decl (decl);
5604 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5607 --current_binding_level->n_incomplete;
5609 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5610 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5612 tree element = TREE_TYPE (decl);
5613 while (TREE_CODE (element) == ARRAY_TYPE)
5614 element = TREE_TYPE (element);
5616 layout_array_type (TREE_TYPE (decl));
5621 resume_momentary (old_momentary);
5623 /* Finish debugging output for this type. */
5624 rest_of_type_compilation (t, toplevel);
5626 /* The matching push is in start_struct. */
5632 /* Lay out the type T, and its element type, and so on. */
5635 layout_array_type (t)
5638 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5639 layout_array_type (TREE_TYPE (t));
5643 /* Begin compiling the definition of an enumeration type.
5644 NAME is its name (or null if anonymous).
5645 Returns the type object, as yet incomplete.
5646 Also records info about it so that build_enumerator
5647 may be used to declare the individual values as they are read. */
5653 register tree enumtype = 0;
5655 /* If this is the real definition for a previous forward reference,
5656 fill in the contents in the same object that used to be the
5657 forward reference. */
5660 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5662 /* The corresponding pop_obstacks is in finish_enum. */
5663 push_obstacks_nochange ();
5664 /* If these symbols and types are global, make them permanent. */
5665 if (current_binding_level == global_binding_level)
5666 end_temporary_allocation ();
5668 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5670 enumtype = make_node (ENUMERAL_TYPE);
5671 pushtag (name, enumtype);
5674 C_TYPE_BEING_DEFINED (enumtype) = 1;
5676 if (TYPE_VALUES (enumtype) != 0)
5678 /* This enum is a named one that has been declared already. */
5679 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5681 /* Completely replace its old definition.
5682 The old enumerators remain defined, however. */
5683 TYPE_VALUES (enumtype) = 0;
5686 enum_next_value = integer_zero_node;
5689 if (flag_short_enums)
5690 TYPE_PACKED (enumtype) = 1;
5695 /* After processing and defining all the values of an enumeration type,
5696 install their decls in the enumeration type and finish it off.
5697 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5698 and ATTRIBUTES are the specified attributes.
5699 Returns ENUMTYPE. */
5702 finish_enum (enumtype, values, attributes)
5707 register tree pair, tem;
5708 tree minnode = 0, maxnode = 0;
5709 int lowprec, highprec, precision;
5710 int toplevel = global_binding_level == current_binding_level;
5712 if (in_parm_level_p ())
5713 warning ("enum defined inside parms");
5715 decl_attributes (enumtype, attributes, NULL_TREE);
5717 /* Calculate the maximum value of any enumerator in this type. */
5719 if (values == error_mark_node)
5720 minnode = maxnode = integer_zero_node;
5722 for (pair = values; pair; pair = TREE_CHAIN (pair))
5724 tree value = TREE_VALUE (pair);
5726 minnode = maxnode = TREE_VALUE (pair);
5729 if (tree_int_cst_lt (maxnode, value))
5731 if (tree_int_cst_lt (value, minnode))
5736 TYPE_MIN_VALUE (enumtype) = minnode;
5737 TYPE_MAX_VALUE (enumtype) = maxnode;
5739 /* An enum can have some negative values; then it is signed. */
5740 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5742 /* Determine the precision this type needs. */
5744 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5745 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5746 precision = MAX (lowprec, highprec);
5748 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5750 tree narrowest = type_for_size (precision, 1);
5753 warning ("enumeration values exceed range of largest integer");
5754 narrowest = long_long_integer_type_node;
5757 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5760 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5762 TYPE_SIZE (enumtype) = 0;
5763 layout_type (enumtype);
5765 if (values != error_mark_node)
5767 /* Change the type of the enumerators to be the enum type.
5768 Formerly this was done only for enums that fit in an int,
5769 but the comment said it was done only for enums wider than int.
5770 It seems necessary to do this for wide enums,
5771 and best not to change what's done for ordinary narrower ones. */
5772 for (pair = values; pair; pair = TREE_CHAIN (pair))
5774 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5775 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5776 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5777 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5780 /* Replace the decl nodes in VALUES with their names. */
5781 for (pair = values; pair; pair = TREE_CHAIN (pair))
5782 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5784 TYPE_VALUES (enumtype) = values;
5787 /* Fix up all variant types of this enum type. */
5788 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5790 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5791 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5792 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5793 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5794 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5795 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5796 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5797 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5798 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5801 /* Finish debugging output for this type. */
5802 rest_of_type_compilation (enumtype, toplevel);
5804 /* This matches a push in start_enum. */
5810 /* Build and install a CONST_DECL for one value of the
5811 current enumeration type (one that was begun with start_enum).
5812 Return a tree-list containing the CONST_DECL and its value.
5813 Assignment of sequential values by default is handled here. */
5816 build_enumerator (name, value)
5819 register tree decl, type;
5821 /* Validate and default VALUE. */
5823 /* Remove no-op casts from the value. */
5825 STRIP_TYPE_NOPS (value);
5829 if (TREE_CODE (value) == INTEGER_CST)
5831 value = default_conversion (value);
5832 constant_expression_warning (value);
5836 error ("enumerator value for `%s' not integer constant",
5837 IDENTIFIER_POINTER (name));
5842 /* Default based on previous value. */
5843 /* It should no longer be possible to have NON_LVALUE_EXPR
5847 value = enum_next_value;
5849 error ("overflow in enumeration values");
5852 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5854 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5855 value = integer_zero_node;
5858 /* Set basis for default for next value. */
5859 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5860 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5862 /* Now create a declaration for the enum value name. */
5864 type = TREE_TYPE (value);
5865 type = type_for_size (MAX (TYPE_PRECISION (type),
5866 TYPE_PRECISION (integer_type_node)),
5868 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5869 && TREE_UNSIGNED (type)));
5871 decl = build_decl (CONST_DECL, name, type);
5872 DECL_INITIAL (decl) = value;
5873 TREE_TYPE (value) = type;
5876 return saveable_tree_cons (decl, value, NULL_TREE);
5879 /* Create the FUNCTION_DECL for a function definition.
5880 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5881 the declaration; they describe the function's name and the type it returns,
5882 but twisted together in a fashion that parallels the syntax of C.
5884 This function creates a binding context for the function body
5885 as well as setting up the FUNCTION_DECL in current_function_decl.
5887 Returns 1 on success. If the DECLARATOR is not suitable for a function
5888 (it defines a datum instead), we return 0, which tells
5889 yyparse to report a parse error.
5891 NESTED is nonzero for a function nested within another function. */
5894 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
5895 tree declarator, declspecs, prefix_attributes, attributes;
5898 tree decl1, old_decl;
5900 int old_immediate_size_expand = immediate_size_expand;
5902 current_function_returns_value = 0; /* Assume, until we see it does. */
5903 current_function_returns_null = 0;
5904 warn_about_return_type = 0;
5905 current_extern_inline = 0;
5906 c_function_varargs = 0;
5908 shadowed_labels = 0;
5910 /* Don't expand any sizes in the return type of the function. */
5911 immediate_size_expand = 0;
5913 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5915 /* If the declarator is not suitable for a function definition,
5916 cause a syntax error. */
5919 immediate_size_expand = old_immediate_size_expand;
5923 decl_attributes (decl1, prefix_attributes, attributes);
5925 announce_function (decl1);
5927 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5929 error ("return-type is an incomplete type");
5930 /* Make it return void instead. */
5932 = build_function_type (void_type_node,
5933 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5936 if (warn_about_return_type)
5937 warning ("return-type defaults to `int'");
5939 /* Save the parm names or decls from this function's declarator
5940 where store_parm_decls will find them. */
5941 current_function_parms = last_function_parms;
5942 current_function_parm_tags = last_function_parm_tags;
5944 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5945 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5946 DECL_INITIAL (decl1) = error_mark_node;
5948 /* If this definition isn't a prototype and we had a prototype declaration
5949 before, copy the arg type info from that prototype.
5950 But not if what we had before was a builtin function. */
5951 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5952 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5953 && !DECL_BUILT_IN (old_decl)
5954 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5955 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5956 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5958 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5959 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5960 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5963 /* If there is no explicit declaration, look for any out-of-scope implicit
5966 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5968 /* Optionally warn of old-fashioned def with no previous prototype. */
5969 if (warn_strict_prototypes
5970 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5971 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5972 warning ("function declaration isn't a prototype");
5973 /* Optionally warn of any global def with no previous prototype. */
5974 else if (warn_missing_prototypes
5975 && TREE_PUBLIC (decl1)
5976 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5977 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5978 warning_with_decl (decl1, "no previous prototype for `%s'");
5979 /* Optionally warn of any def with no previous prototype
5980 if the function has already been used. */
5981 else if (warn_missing_prototypes
5982 && old_decl != 0 && TREE_USED (old_decl)
5983 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5984 warning_with_decl (decl1,
5985 "`%s' was used with no prototype before its definition");
5986 /* Optionally warn of any global def with no previous declaration. */
5987 else if (warn_missing_declarations
5988 && TREE_PUBLIC (decl1)
5990 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5991 warning_with_decl (decl1, "no previous declaration for `%s'");
5992 /* Optionally warn of any def with no previous declaration
5993 if the function has already been used. */
5994 else if (warn_missing_declarations
5995 && old_decl != 0 && TREE_USED (old_decl)
5996 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5997 warning_with_decl (decl1,
5998 "`%s' was used with no declaration before its definition");
6000 /* This is a definition, not a reference.
6001 So normally clear DECL_EXTERNAL.
6002 However, `extern inline' acts like a declaration
6003 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6004 DECL_EXTERNAL (decl1) = current_extern_inline;
6006 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6007 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6010 /* This function exists in static storage.
6011 (This does not mean `static' in the C sense!) */
6012 TREE_STATIC (decl1) = 1;
6014 /* A nested function is not global. */
6015 if (current_function_decl != 0)
6016 TREE_PUBLIC (decl1) = 0;
6018 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6020 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6025 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6026 != integer_type_node)
6027 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6029 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6030 args = TREE_CHAIN (args))
6032 tree type = args ? TREE_VALUE (args) : 0;
6034 if (type == void_type_node)
6041 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6042 pedwarn_with_decl (decl1,
6043 "first argument of `%s' should be `int'");
6047 if (TREE_CODE (type) != POINTER_TYPE
6048 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6049 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6051 pedwarn_with_decl (decl1,
6052 "second argument of `%s' should be `char **'");
6056 if (TREE_CODE (type) != POINTER_TYPE
6057 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6058 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6060 pedwarn_with_decl (decl1,
6061 "third argument of `%s' should probably be `char **'");
6066 /* It is intentional that this message does not mention the third
6067 argument, which is warned for only pedantically, because it's
6068 blessed by mention in an appendix of the standard. */
6069 if (argct > 0 && (argct < 2 || argct > 3))
6070 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6072 if (argct == 3 && pedantic)
6073 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6075 if (! TREE_PUBLIC (decl1))
6076 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6079 /* Record the decl so that the function name is defined.
6080 If we already have a decl for this name, and it is a FUNCTION_DECL,
6081 use the old decl. */
6083 current_function_decl = pushdecl (decl1);
6086 declare_parm_level (1);
6087 current_binding_level->subblocks_tag_transparent = 1;
6089 make_function_rtl (current_function_decl);
6091 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6092 /* Promote the value to int before returning it. */
6093 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6095 /* It retains unsignedness if traditional
6096 or if not really getting wider. */
6097 if (TREE_UNSIGNED (restype)
6098 && (flag_traditional
6099 || (TYPE_PRECISION (restype)
6100 == TYPE_PRECISION (integer_type_node))))
6101 restype = unsigned_type_node;
6103 restype = integer_type_node;
6105 DECL_RESULT (current_function_decl)
6106 = build_decl (RESULT_DECL, NULL_TREE, restype);
6109 /* Allocate further tree nodes temporarily during compilation
6110 of this function only. */
6111 temporary_allocation ();
6113 /* If this fcn was already referenced via a block-scope `extern' decl
6114 (or an implicit decl), propagate certain information about the usage. */
6115 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6116 TREE_ADDRESSABLE (current_function_decl) = 1;
6118 immediate_size_expand = old_immediate_size_expand;
6123 /* Record that this function is going to be a varargs function.
6124 This is called before store_parm_decls, which is too early
6125 to call mark_varargs directly. */
6130 c_function_varargs = 1;
6133 /* Store the parameter declarations into the current function declaration.
6134 This is called after parsing the parameter declarations, before
6135 digesting the body of the function.
6137 For an old-style definition, modify the function's type
6138 to specify at least the number of arguments. */
6143 register tree fndecl = current_function_decl;
6146 /* This is either a chain of PARM_DECLs (if a prototype was used)
6147 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6148 tree specparms = current_function_parms;
6150 /* This is a list of types declared among parms in a prototype. */
6151 tree parmtags = current_function_parm_tags;
6153 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6154 register tree parmdecls = getdecls ();
6156 /* This is a chain of any other decls that came in among the parm
6157 declarations. If a parm is declared with enum {foo, bar} x;
6158 then CONST_DECLs for foo and bar are put here. */
6161 /* Nonzero if this definition is written with a prototype. */
6164 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6166 /* This case is when the function was defined with an ANSI prototype.
6167 The parms already have decls, so we need not do anything here
6168 except record them as in effect
6169 and complain if any redundant old-style parm decls were written. */
6180 error_with_decl (fndecl,
6181 "parm types given both in parmlist and separately");
6182 /* Get rid of the erroneous decls; don't keep them on
6183 the list of parms, since they might not be PARM_DECLs. */
6184 for (decl = current_binding_level->names;
6185 decl; decl = TREE_CHAIN (decl))
6186 if (DECL_NAME (decl))
6187 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6188 for (link = current_binding_level->shadowed;
6189 link; link = TREE_CHAIN (link))
6190 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6191 current_binding_level->names = 0;
6192 current_binding_level->shadowed = 0;
6195 specparms = nreverse (specparms);
6196 for (parm = specparms; parm; parm = next)
6198 next = TREE_CHAIN (parm);
6199 if (TREE_CODE (parm) == PARM_DECL)
6201 if (DECL_NAME (parm) == 0)
6202 error_with_decl (parm, "parameter name omitted");
6203 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6205 error_with_decl (parm, "parameter `%s' declared void");
6206 /* Change the type to error_mark_node so this parameter
6207 will be ignored by assign_parms. */
6208 TREE_TYPE (parm) = error_mark_node;
6214 /* If we find an enum constant or a type tag,
6215 put it aside for the moment. */
6216 TREE_CHAIN (parm) = 0;
6217 others = chainon (others, parm);
6221 /* Get the decls in their original chain order
6222 and record in the function. */
6223 DECL_ARGUMENTS (fndecl) = getdecls ();
6226 /* If this function takes a variable number of arguments,
6227 add a phony parameter to the end of the parm list,
6228 to represent the position of the first unnamed argument. */
6229 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6232 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6233 /* Let's hope the address of the unnamed parm
6234 won't depend on its type. */
6235 TREE_TYPE (dummy) = integer_type_node;
6236 DECL_ARG_TYPE (dummy) = integer_type_node;
6237 DECL_ARGUMENTS (fndecl)
6238 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6242 /* Now pushdecl the enum constants. */
6243 for (parm = others; parm; parm = next)
6245 next = TREE_CHAIN (parm);
6246 if (DECL_NAME (parm) == 0)
6248 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6250 else if (TREE_CODE (parm) != PARM_DECL)
6254 storetags (chainon (parmtags, gettags ()));
6258 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6259 each with a parm name as the TREE_VALUE.
6261 PARMDECLS is a chain of declarations for parameters.
6262 Warning! It can also contain CONST_DECLs which are not parameters
6263 but are names of enumerators of any enum types
6264 declared among the parameters.
6266 First match each formal parameter name with its declaration.
6267 Associate decls with the names and store the decls
6268 into the TREE_PURPOSE slots. */
6270 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6271 DECL_RESULT (parm) = 0;
6273 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6275 register tree tail, found = NULL;
6277 if (TREE_VALUE (parm) == 0)
6279 error_with_decl (fndecl, "parameter name missing from parameter list");
6280 TREE_PURPOSE (parm) = 0;
6284 /* See if any of the parmdecls specifies this parm by name.
6285 Ignore any enumerator decls. */
6286 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6287 if (DECL_NAME (tail) == TREE_VALUE (parm)
6288 && TREE_CODE (tail) == PARM_DECL)
6294 /* If declaration already marked, we have a duplicate name.
6295 Complain, and don't use this decl twice. */
6296 if (found && DECL_RESULT (found) != 0)
6298 error_with_decl (found, "multiple parameters named `%s'");
6302 /* If the declaration says "void", complain and ignore it. */
6303 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6305 error_with_decl (found, "parameter `%s' declared void");
6306 TREE_TYPE (found) = integer_type_node;
6307 DECL_ARG_TYPE (found) = integer_type_node;
6308 layout_decl (found, 0);
6311 /* Traditionally, a parm declared float is actually a double. */
6312 if (found && flag_traditional
6313 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6315 TREE_TYPE (found) = double_type_node;
6316 DECL_ARG_TYPE (found) = double_type_node;
6317 layout_decl (found, 0);
6320 /* If no declaration found, default to int. */
6323 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6325 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6326 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6327 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6329 warning_with_decl (found, "type of `%s' defaults to `int'");
6333 TREE_PURPOSE (parm) = found;
6335 /* Mark this decl as "already found" -- see test, above.
6336 It is safe to use DECL_RESULT for this
6337 since it is not used in PARM_DECLs or CONST_DECLs. */
6338 DECL_RESULT (found) = error_mark_node;
6341 /* Put anything which is on the parmdecls chain and which is
6342 not a PARM_DECL onto the list NONPARMS. (The types of
6343 non-parm things which might appear on the list include
6344 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6345 any actual PARM_DECLs not matched with any names. */
6348 for (parm = parmdecls; parm; )
6350 tree next = TREE_CHAIN (parm);
6351 TREE_CHAIN (parm) = 0;
6353 if (TREE_CODE (parm) != PARM_DECL)
6354 nonparms = chainon (nonparms, parm);
6357 /* Complain about args with incomplete types. */
6358 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6360 error_with_decl (parm, "parameter `%s' has incomplete type");
6361 TREE_TYPE (parm) = error_mark_node;
6364 if (DECL_RESULT (parm) == 0)
6366 error_with_decl (parm,
6367 "declaration for parameter `%s' but no such parameter");
6368 /* Pretend the parameter was not missing.
6369 This gets us to a standard state and minimizes
6370 further error messages. */
6372 = chainon (specparms,
6373 tree_cons (parm, NULL_TREE, NULL_TREE));
6380 /* Chain the declarations together in the order of the list of names. */
6381 /* Store that chain in the function decl, replacing the list of names. */
6383 DECL_ARGUMENTS (fndecl) = 0;
6386 for (last = 0; parm; parm = TREE_CHAIN (parm))
6387 if (TREE_PURPOSE (parm))
6390 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6392 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6393 last = TREE_PURPOSE (parm);
6394 TREE_CHAIN (last) = 0;
6398 /* If there was a previous prototype,
6399 set the DECL_ARG_TYPE of each argument according to
6400 the type previously specified, and report any mismatches. */
6402 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6405 for (parm = DECL_ARGUMENTS (fndecl),
6406 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6407 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6408 != void_type_node));
6409 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6411 if (parm == 0 || type == 0
6412 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6414 error ("number of arguments doesn't match prototype");
6415 error_with_file_and_line (current_function_prototype_file,
6416 current_function_prototype_line,
6417 "prototype declaration");
6420 /* Type for passing arg must be consistent
6421 with that declared for the arg. */
6422 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6424 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6425 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6427 /* Adjust argument to match prototype. E.g. a previous
6428 `int foo(float);' prototype causes
6429 `int foo(x) float x; {...}' to be treated like
6430 `int foo(float x) {...}'. This is particularly
6431 useful for argument types like uid_t. */
6432 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6434 if (PROMOTE_PROTOTYPES
6435 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6436 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6437 && TYPE_PRECISION (TREE_TYPE (parm))
6438 < TYPE_PRECISION (integer_type_node))
6439 DECL_ARG_TYPE (parm) = integer_type_node;
6443 pedwarn ("promoted argument `%s' doesn't match prototype",
6444 IDENTIFIER_POINTER (DECL_NAME (parm)));
6445 warning_with_file_and_line
6446 (current_function_prototype_file,
6447 current_function_prototype_line,
6448 "prototype declaration");
6451 /* If -traditional, allow `int' argument to match
6452 `unsigned' prototype. */
6453 else if (! (flag_traditional
6454 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6455 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6457 error ("argument `%s' doesn't match prototype",
6458 IDENTIFIER_POINTER (DECL_NAME (parm)));
6459 error_with_file_and_line (current_function_prototype_file,
6460 current_function_prototype_line,
6461 "prototype declaration");
6465 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6468 /* Otherwise, create a prototype that would match. */
6472 tree actual = 0, last = 0, type;
6474 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6476 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6479 TREE_CHAIN (last) = type;
6484 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6486 TREE_CHAIN (last) = type;
6490 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6491 of the type of this function, but we need to avoid having this
6492 affect the types of other similarly-typed functions, so we must
6493 first force the generation of an identical (but separate) type
6494 node for the relevant function type. The new node we create
6495 will be a variant of the main variant of the original function
6498 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6500 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6503 /* Now store the final chain of decls for the arguments
6504 as the decl-chain of the current lexical scope.
6505 Put the enumerators in as well, at the front so that
6506 DECL_ARGUMENTS is not modified. */
6508 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6511 /* Make sure the binding level for the top of the function body
6512 gets a BLOCK if there are any in the function.
6513 Otherwise, the dbx output is wrong. */
6515 keep_next_if_subblocks = 1;
6517 /* ??? This might be an improvement,
6518 but needs to be thought about some more. */
6520 keep_next_level_flag = 1;
6523 /* Write a record describing this function definition to the prototypes
6524 file (if requested). */
6526 gen_aux_info_record (fndecl, 1, 0, prototype);
6528 /* Initialize the RTL code for the function. */
6530 init_function_start (fndecl, input_filename, lineno);
6532 /* If this is a varargs function, inform function.c. */
6534 if (c_function_varargs)
6537 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6539 declare_function_name ();
6541 /* Set up parameters and prepare for return, for the function. */
6543 expand_function_start (fndecl, 0);
6545 /* If this function is `main', emit a call to `__main'
6546 to run global initializers, etc. */
6547 if (DECL_NAME (fndecl)
6548 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6549 && DECL_CONTEXT (fndecl) == NULL_TREE)
6550 expand_main_function ();
6553 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6554 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6555 stands for an ellipsis in the identifier list.
6557 PARMLIST is the data returned by get_parm_info for the
6558 parmlist that follows the semicolon.
6560 We return a value of the same sort that get_parm_info returns,
6561 except that it describes the combination of identifiers and parmlist. */
6564 combine_parm_decls (specparms, parmlist, void_at_end)
6565 tree specparms, parmlist;
6568 register tree fndecl = current_function_decl;
6571 tree parmdecls = TREE_PURPOSE (parmlist);
6573 /* This is a chain of any other decls that came in among the parm
6574 declarations. They were separated already by get_parm_info,
6575 so we just need to keep them separate. */
6576 tree nonparms = TREE_VALUE (parmlist);
6580 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6581 DECL_RESULT (parm) = 0;
6583 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6585 register tree tail, found = NULL;
6587 /* See if any of the parmdecls specifies this parm by name. */
6588 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6589 if (DECL_NAME (tail) == TREE_VALUE (parm))
6595 /* If declaration already marked, we have a duplicate name.
6596 Complain, and don't use this decl twice. */
6597 if (found && DECL_RESULT (found) != 0)
6599 error_with_decl (found, "multiple parameters named `%s'");
6603 /* If the declaration says "void", complain and ignore it. */
6604 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6606 error_with_decl (found, "parameter `%s' declared void");
6607 TREE_TYPE (found) = integer_type_node;
6608 DECL_ARG_TYPE (found) = integer_type_node;
6609 layout_decl (found, 0);
6612 /* Traditionally, a parm declared float is actually a double. */
6613 if (found && flag_traditional
6614 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6616 TREE_TYPE (found) = double_type_node;
6617 DECL_ARG_TYPE (found) = double_type_node;
6618 layout_decl (found, 0);
6621 /* If no declaration found, default to int. */
6624 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6626 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6627 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6628 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6629 error_with_decl (found, "type of parameter `%s' is not declared");
6633 TREE_PURPOSE (parm) = found;
6635 /* Mark this decl as "already found" -- see test, above.
6636 It is safe to use DECL_RESULT for this
6637 since it is not used in PARM_DECLs or CONST_DECLs. */
6638 DECL_RESULT (found) = error_mark_node;
6641 /* Complain about any actual PARM_DECLs not matched with any names. */
6643 for (parm = parmdecls; parm; )
6645 tree next = TREE_CHAIN (parm);
6646 TREE_CHAIN (parm) = 0;
6648 /* Complain about args with incomplete types. */
6649 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6651 error_with_decl (parm, "parameter `%s' has incomplete type");
6652 TREE_TYPE (parm) = error_mark_node;
6655 if (DECL_RESULT (parm) == 0)
6657 error_with_decl (parm,
6658 "declaration for parameter `%s' but no such parameter");
6659 /* Pretend the parameter was not missing.
6660 This gets us to a standard state and minimizes
6661 further error messages. */
6663 = chainon (specparms,
6664 tree_cons (parm, NULL_TREE, NULL_TREE));
6670 /* Chain the declarations together in the order of the list of names.
6671 At the same time, build up a list of their types, in reverse order. */
6677 for (last = 0; parm; parm = TREE_CHAIN (parm))
6678 if (TREE_PURPOSE (parm))
6681 parmdecls = TREE_PURPOSE (parm);
6683 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6684 last = TREE_PURPOSE (parm);
6685 TREE_CHAIN (last) = 0;
6687 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6692 return saveable_tree_cons (parmdecls, nonparms,
6693 nreverse (saveable_tree_cons (NULL_TREE,
6697 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6700 /* Finish up a function declaration and compile that function
6701 all the way to assembler language output. The free the storage
6702 for the function definition.
6704 This is called after parsing the body of the function definition.
6706 NESTED is nonzero if the function being finished is nested in another. */
6709 finish_function (nested)
6712 register tree fndecl = current_function_decl;
6714 /* TREE_READONLY (fndecl) = 1;
6715 This caused &foo to be of type ptr-to-const-function
6716 which then got a warning when stored in a ptr-to-function variable. */
6719 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6721 /* Must mark the RESULT_DECL as being in this function. */
6723 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6725 /* Obey `register' declarations if `setjmp' is called in this fn. */
6726 if (flag_traditional && current_function_calls_setjmp)
6728 setjmp_protect (DECL_INITIAL (fndecl));
6729 setjmp_protect_args ();
6732 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6734 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6735 != integer_type_node)
6737 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6738 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6740 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6744 #ifdef DEFAULT_MAIN_RETURN
6745 /* Make it so that `main' always returns success by default. */
6746 DEFAULT_MAIN_RETURN;
6751 /* Generate rtl for function exit. */
6752 expand_function_end (input_filename, lineno, 0);
6754 /* So we can tell if jump_optimize sets it to 1. */
6757 /* If this is a nested function, protect the local variables in the stack
6758 above us from being collected while we're compiling this function. */
6759 if (ggc_p && nested)
6760 ggc_push_context ();
6762 /* Run the optimizers and output the assembler code for this function. */
6763 rest_of_compilation (fndecl);
6765 /* Undo the GC context switch. */
6766 if (ggc_p && nested)
6769 current_function_returns_null |= can_reach_end;
6771 if (warn_missing_noreturn
6772 && !TREE_THIS_VOLATILE (fndecl)
6773 && !current_function_returns_null
6774 && !current_function_returns_value)
6775 warning ("function might be possible candidate for attribute `noreturn'");
6777 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6778 warning ("`noreturn' function does return");
6779 else if (warn_return_type && can_reach_end
6780 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6781 /* If this function returns non-void and control can drop through,
6783 warning ("control reaches end of non-void function");
6784 /* With just -W, complain only if function returns both with
6785 and without a value. */
6786 else if (extra_warnings
6787 && current_function_returns_value && current_function_returns_null)
6788 warning ("this function may return with or without a value");
6790 /* If requested, warn about function definitions where the function will
6791 return a value (usually of some struct or union type) which itself will
6792 take up a lot of stack space. */
6794 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6796 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6800 register tree ret_type_size = TYPE_SIZE (ret_type);
6802 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6805 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6807 if (units > larger_than_size)
6808 warning_with_decl (fndecl,
6809 "size of return value of `%s' is %u bytes",
6815 /* Free all the tree nodes making up this function. */
6816 /* Switch back to allocating nodes permanently
6817 until we start another function. */
6819 permanent_allocation (1);
6821 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6823 /* Stop pointing to the local nodes about to be freed. */
6824 /* But DECL_INITIAL must remain nonzero so we know this
6825 was an actual function definition. */
6826 /* For a nested function, this is done in pop_c_function_context. */
6827 /* If rest_of_compilation set this to 0, leave it 0. */
6828 if (DECL_INITIAL (fndecl) != 0)
6829 DECL_INITIAL (fndecl) = error_mark_node;
6830 DECL_ARGUMENTS (fndecl) = 0;
6833 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6835 #ifndef ASM_OUTPUT_CONSTRUCTOR
6836 if (! flag_gnu_linker)
6837 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6840 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6843 if (DECL_STATIC_DESTRUCTOR (fndecl))
6845 #ifndef ASM_OUTPUT_DESTRUCTOR
6846 if (! flag_gnu_linker)
6847 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6850 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6855 /* Let the error reporting routines know that we're outside a
6856 function. For a nested function, this value is used in
6857 pop_c_function_context and then reset via pop_function_context. */
6858 current_function_decl = NULL;
6862 /* Save and restore the variables in this file and elsewhere
6863 that keep track of the progress of compilation of the current function.
6864 Used for nested functions. */
6866 struct language_function
6869 tree shadowed_labels;
6872 int warn_about_return_type;
6874 struct binding_level *binding_level;
6877 /* Save and reinitialize the variables
6878 used during compilation of a C function. */
6881 push_c_function_context (f)
6884 struct language_function *p;
6885 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6888 p->named_labels = named_labels;
6889 p->shadowed_labels = shadowed_labels;
6890 p->returns_value = current_function_returns_value;
6891 p->returns_null = current_function_returns_null;
6892 p->warn_about_return_type = warn_about_return_type;
6893 p->extern_inline = current_extern_inline;
6894 p->binding_level = current_binding_level;
6897 /* Restore the variables used during compilation of a C function. */
6900 pop_c_function_context (f)
6903 struct language_function *p = f->language;
6906 /* Bring back all the labels that were shadowed. */
6907 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6908 if (DECL_NAME (TREE_VALUE (link)) != 0)
6909 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6910 = TREE_VALUE (link);
6912 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6914 /* Stop pointing to the local nodes about to be freed. */
6915 /* But DECL_INITIAL must remain nonzero so we know this
6916 was an actual function definition. */
6917 DECL_INITIAL (current_function_decl) = error_mark_node;
6918 DECL_ARGUMENTS (current_function_decl) = 0;
6921 named_labels = p->named_labels;
6922 shadowed_labels = p->shadowed_labels;
6923 current_function_returns_value = p->returns_value;
6924 current_function_returns_null = p->returns_null;
6925 warn_about_return_type = p->warn_about_return_type;
6926 current_extern_inline = p->extern_inline;
6927 current_binding_level = p->binding_level;
6933 /* Mark the language specific parts of F for GC. */
6935 mark_c_function_context (f)
6938 struct language_function *p = f->language;
6943 ggc_mark_tree (p->shadowed_labels);
6944 ggc_mark_tree (p->named_labels);
6945 mark_binding_level (&p->binding_level);
6948 /* integrate_decl_tree calls this function, but since we don't use the
6949 DECL_LANG_SPECIFIC field, this is a no-op. */
6952 copy_lang_decl (node)
6953 tree node ATTRIBUTE_UNUSED;
6957 /* Mark ARG for GC. */
6959 lang_mark_false_label_stack (arg)
6960 struct label_node *arg;
6962 /* C doesn't use false_label_stack. It better be NULL. */
6967 /* Mark the language specific bits in T for GC. */
6972 if (TREE_CODE (t) == IDENTIFIER_NODE)
6974 struct lang_identifier *i = (struct lang_identifier *) t;
6975 ggc_mark_tree (i->global_value);
6976 ggc_mark_tree (i->local_value);
6977 ggc_mark_tree (i->label_value);
6978 ggc_mark_tree (i->implicit_decl);
6979 ggc_mark_tree (i->error_locus);
6980 ggc_mark_tree (i->limbo_value);
6982 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6983 ggc_mark (TYPE_LANG_SPECIFIC (t));