1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* Process declarations and symbol lookup for C front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
80 /* Nonzero if we have seen an invalid cross reference
81 to a struct, union, or enum, but not yet printed the message. */
83 tree pending_invalid_xref;
84 /* File and line to appear in the eventual error message. */
85 const char *pending_invalid_xref_file;
86 int pending_invalid_xref_line;
88 /* While defining an enum type, this is 1 plus the last enumerator
89 constant value. Note that will do not have to save this or `enum_overflow'
90 around nested function definition since such a definition could only
91 occur in an enum value expression and we don't use these variables in
94 static tree enum_next_value;
96 /* Nonzero means that there was overflow computing enum_next_value. */
98 static int enum_overflow;
100 /* Parsing a function declarator leaves a list of parameter names
101 or a chain or parameter decls here. */
103 static tree last_function_parms;
105 /* Parsing a function declarator leaves here a chain of structure
106 and enum types declared in the parmlist. */
108 static tree last_function_parm_tags;
110 /* After parsing the declarator that starts a function definition,
111 `start_function' puts here the list of parameter names or chain of decls.
112 `store_parm_decls' finds it here. */
114 static tree current_function_parms;
116 /* Similar, for last_function_parm_tags. */
117 static tree current_function_parm_tags;
119 /* Similar, for the file and line that the prototype came from if this is
120 an old-style definition. */
121 static const char *current_function_prototype_file;
122 static int current_function_prototype_line;
124 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
125 that have names. Here so we can clear out their names' definitions
126 at the end of the function. */
128 static tree named_labels;
130 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
132 static tree shadowed_labels;
134 /* Nonzero when store_parm_decls is called indicates a varargs function.
135 Value not meaningful after store_parm_decls. */
137 static int c_function_varargs;
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 PARAMS ((void));
281 static void mark_binding_level PARAMS ((void *));
282 static void clear_limbo_values PARAMS ((tree));
283 static int duplicate_decls PARAMS ((tree, tree, int));
284 static int redeclaration_error_message PARAMS ((tree, tree));
285 static void storedecls PARAMS ((tree));
286 static void storetags PARAMS ((tree));
287 static tree lookup_tag PARAMS ((enum tree_code, tree,
288 struct binding_level *, int));
289 static tree lookup_tag_reverse PARAMS ((tree));
290 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
292 static tree grokparms PARAMS ((tree, int));
293 static void layout_array_type PARAMS ((tree));
294 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
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 C99 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 /* Warn about testing equality of floating point numbers. */
451 int warn_float_equal = 0;
453 /* Nonzero means warn about use of multicharacter literals. */
455 int warn_multichar = 1;
457 /* The variant of the C language being processed. */
459 c_language_kind c_language = clk_c;
461 /* Nonzero means `$' can be in an identifier. */
463 #ifndef DOLLARS_IN_IDENTIFIERS
464 #define DOLLARS_IN_IDENTIFIERS 1
466 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
468 /* Decode the string P as a language-specific option for C.
469 Return the number of strings consumed. Should not complain
470 if it does not recognise the option. */
473 c_decode_option (argc, argv)
474 int argc ATTRIBUTE_UNUSED;
477 int strings_processed;
480 strings_processed = cpp_handle_option (&parse_in, argc, argv);
482 strings_processed = 0;
483 #endif /* ! USE_CPPLIB */
485 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
487 flag_traditional = 1;
488 flag_writable_strings = 1;
490 else if (!strcmp (p, "-fallow-single-precision"))
491 flag_allow_single_precision = 1;
492 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
497 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
501 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
505 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
507 flag_traditional = 0;
508 flag_writable_strings = 0;
510 else if (!strncmp (p, "-std=", 5))
512 /* Select the appropriate language standard. We currently
514 -std=iso9899:1990 same as -ansi
515 -std=iso9899:199409 ISO C as modified in amend. 1
516 -std=iso9899:1999 ISO C 99
517 -std=c89 same as -std=iso9899:1990
518 -std=c99 same as -std=iso9899:1999
519 -std=gnu89 default, iso9899:1990 + gnu extensions
520 -std=gnu99 iso9899:1999 + gnu extensions
522 const char *argstart = &p[5];
524 if (!strcmp (argstart, "iso9899:1990")
525 || !strcmp (argstart, "c89"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
531 flag_no_nonansi_builtin = 1;
534 else if (!strcmp (argstart, "iso9899:199409"))
536 /* ??? The changes since ISO C 1990 are not supported. */
539 else if (!strcmp (argstart, "iso9899:199x")
540 || !strcmp (argstart, "iso9899:1999")
541 || !strcmp (argstart, "c9x")
542 || !strcmp (argstart, "c99"))
544 flag_traditional = 0;
545 flag_writable_strings = 0;
547 flag_no_nonansi_builtin = 1;
550 else if (!strcmp (argstart, "gnu89"))
552 flag_traditional = 0;
553 flag_writable_strings = 0;
555 flag_no_nonansi_builtin = 0;
558 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
560 flag_traditional = 0;
561 flag_writable_strings = 0;
563 flag_no_nonansi_builtin = 0;
567 error ("unknown C standard `%s'", argstart);
569 else if (!strcmp (p, "-fdollars-in-identifiers"))
570 dollars_in_ident = 1;
571 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
572 dollars_in_ident = 0;
573 else if (!strcmp (p, "-fsigned-char"))
574 flag_signed_char = 1;
575 else if (!strcmp (p, "-funsigned-char"))
576 flag_signed_char = 0;
577 else if (!strcmp (p, "-fno-signed-char"))
578 flag_signed_char = 0;
579 else if (!strcmp (p, "-fno-unsigned-char"))
580 flag_signed_char = 1;
581 else if (!strcmp (p, "-fsigned-bitfields")
582 || !strcmp (p, "-fno-unsigned-bitfields"))
584 flag_signed_bitfields = 1;
585 explicit_flag_signed_bitfields = 1;
587 else if (!strcmp (p, "-funsigned-bitfields")
588 || !strcmp (p, "-fno-signed-bitfields"))
590 flag_signed_bitfields = 0;
591 explicit_flag_signed_bitfields = 1;
593 else if (!strcmp (p, "-fshort-enums"))
594 flag_short_enums = 1;
595 else if (!strcmp (p, "-fno-short-enums"))
596 flag_short_enums = 0;
597 else if (!strcmp (p, "-fshort-wchar"))
598 flag_short_wchar = 1;
599 else if (!strcmp (p, "-fno-short-wchar"))
600 flag_short_wchar = 0;
601 else if (!strcmp (p, "-fcond-mismatch"))
602 flag_cond_mismatch = 1;
603 else if (!strcmp (p, "-fno-cond-mismatch"))
604 flag_cond_mismatch = 0;
605 else if (!strcmp (p, "-fshort-double"))
606 flag_short_double = 1;
607 else if (!strcmp (p, "-fno-short-double"))
608 flag_short_double = 0;
609 else if (!strcmp (p, "-fasm"))
611 else if (!strcmp (p, "-fno-asm"))
613 else if (!strcmp (p, "-fbuiltin"))
615 else if (!strcmp (p, "-fno-builtin"))
617 else if (!strcmp (p, "-ansi"))
619 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
620 mesg_implicit_function_declaration = 2;
621 else if (!strcmp (p, "-Wimplicit-function-declaration"))
622 mesg_implicit_function_declaration = 1;
623 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
624 mesg_implicit_function_declaration = 0;
625 else if (!strcmp (p, "-Wimplicit-int"))
626 warn_implicit_int = 1;
627 else if (!strcmp (p, "-Wno-implicit-int"))
628 warn_implicit_int = 0;
629 else if (!strcmp (p, "-Wimplicit"))
631 warn_implicit_int = 1;
632 if (mesg_implicit_function_declaration != 2)
633 mesg_implicit_function_declaration = 1;
635 else if (!strcmp (p, "-Wno-implicit"))
636 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
637 else if (!strcmp (p, "-Wlong-long"))
639 else if (!strcmp (p, "-Wno-long-long"))
641 else if (!strcmp (p, "-Wwrite-strings"))
642 flag_const_strings = 1;
643 else if (!strcmp (p, "-Wno-write-strings"))
644 flag_const_strings = 0;
645 else if (!strcmp (p, "-Wcast-qual"))
647 else if (!strcmp (p, "-Wno-cast-qual"))
649 else if (!strcmp (p, "-Wbad-function-cast"))
650 warn_bad_function_cast = 1;
651 else if (!strcmp (p, "-Wno-bad-function-cast"))
652 warn_bad_function_cast = 0;
653 else if (!strcmp (p, "-Wmissing-noreturn"))
654 warn_missing_noreturn = 1;
655 else if (!strcmp (p, "-Wno-missing-noreturn"))
656 warn_missing_noreturn = 0;
657 else if (!strcmp (p, "-Wpointer-arith"))
658 warn_pointer_arith = 1;
659 else if (!strcmp (p, "-Wno-pointer-arith"))
660 warn_pointer_arith = 0;
661 else if (!strcmp (p, "-Wstrict-prototypes"))
662 warn_strict_prototypes = 1;
663 else if (!strcmp (p, "-Wno-strict-prototypes"))
664 warn_strict_prototypes = 0;
665 else if (!strcmp (p, "-Wmissing-prototypes"))
666 warn_missing_prototypes = 1;
667 else if (!strcmp (p, "-Wno-missing-prototypes"))
668 warn_missing_prototypes = 0;
669 else if (!strcmp (p, "-Wmissing-declarations"))
670 warn_missing_declarations = 1;
671 else if (!strcmp (p, "-Wno-missing-declarations"))
672 warn_missing_declarations = 0;
673 else if (!strcmp (p, "-Wredundant-decls"))
674 warn_redundant_decls = 1;
675 else if (!strcmp (p, "-Wno-redundant-decls"))
676 warn_redundant_decls = 0;
677 else if (!strcmp (p, "-Wnested-externs"))
678 warn_nested_externs = 1;
679 else if (!strcmp (p, "-Wno-nested-externs"))
680 warn_nested_externs = 0;
681 else if (!strcmp (p, "-Wtraditional"))
682 warn_traditional = 1;
683 else if (!strcmp (p, "-Wno-traditional"))
684 warn_traditional = 0;
685 else if (!strncmp (p, "-Wformat=", 9))
686 warn_format = atol (p + 9);
687 else if (!strcmp (p, "-Wformat"))
689 else if (!strcmp (p, "-Wno-format"))
691 else if (!strcmp (p, "-Wchar-subscripts"))
692 warn_char_subscripts = 1;
693 else if (!strcmp (p, "-Wno-char-subscripts"))
694 warn_char_subscripts = 0;
695 else if (!strcmp (p, "-Wconversion"))
697 else if (!strcmp (p, "-Wno-conversion"))
699 else if (!strcmp (p, "-Wparentheses"))
700 warn_parentheses = 1;
701 else if (!strcmp (p, "-Wno-parentheses"))
702 warn_parentheses = 0;
703 else if (!strcmp (p, "-Wreturn-type"))
704 warn_return_type = 1;
705 else if (!strcmp (p, "-Wno-return-type"))
706 warn_return_type = 0;
707 else if (!strcmp (p, "-Wcomment"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p, "-Wno-comment"))
710 ; /* cpp handles this one. */
711 else if (!strcmp (p, "-Wcomments"))
712 ; /* cpp handles this one. */
713 else if (!strcmp (p, "-Wno-comments"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wtrigraphs"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wno-trigraphs"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wundef"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wno-undef"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p, "-Wimport"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p, "-Wno-import"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p, "-Wmissing-braces"))
728 warn_missing_braces = 1;
729 else if (!strcmp (p, "-Wno-missing-braces"))
730 warn_missing_braces = 0;
731 else if (!strcmp (p, "-Wmain"))
733 else if (!strcmp (p, "-Wno-main"))
735 else if (!strcmp (p, "-Wsign-compare"))
736 warn_sign_compare = 1;
737 else if (!strcmp (p, "-Wno-sign-compare"))
738 warn_sign_compare = 0;
739 else if (!strcmp (p, "-Wfloat-equal"))
740 warn_float_equal = 1;
741 else if (!strcmp (p, "-Wno-float-equal"))
742 warn_float_equal = 0;
743 else if (!strcmp (p, "-Wmultichar"))
745 else if (!strcmp (p, "-Wno-multichar"))
747 else if (!strcmp (p, "-Wunknown-pragmas"))
748 /* Set to greater than 1, so that even unknown pragmas in system
749 headers will be warned about. */
750 warn_unknown_pragmas = 2;
751 else if (!strcmp (p, "-Wno-unknown-pragmas"))
752 warn_unknown_pragmas = 0;
753 else if (!strcmp (p, "-Wall"))
755 /* We save the value of warn_uninitialized, since if they put
756 -Wuninitialized on the command line, we need to generate a
757 warning about not using it without also specifying -O. */
758 if (warn_uninitialized != 1)
759 warn_uninitialized = 2;
760 warn_implicit_int = 1;
761 mesg_implicit_function_declaration = 1;
762 warn_return_type = 1;
766 warn_char_subscripts = 1;
767 warn_parentheses = 1;
768 warn_missing_braces = 1;
769 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
770 it off only if it's not explicit. */
772 /* Only warn about unknown pragmas that are not in system headers. */
773 warn_unknown_pragmas = 1;
776 return strings_processed;
781 /* Hooks for print_node. */
784 print_lang_decl (file, node, indent)
785 FILE *file ATTRIBUTE_UNUSED;
786 tree node ATTRIBUTE_UNUSED;
787 int indent ATTRIBUTE_UNUSED;
792 print_lang_type (file, node, indent)
793 FILE *file ATTRIBUTE_UNUSED;
794 tree node ATTRIBUTE_UNUSED;
795 int indent ATTRIBUTE_UNUSED;
800 print_lang_identifier (file, node, indent)
805 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
806 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
807 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
808 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
809 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
810 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
813 /* Hook called at end of compilation to assume 1 elt
814 for a top-level array decl that wasn't complete before. */
817 finish_incomplete_decl (decl)
820 if (TREE_CODE (decl) == VAR_DECL)
822 tree type = TREE_TYPE (decl);
823 if (type != error_mark_node
824 && TREE_CODE (type) == ARRAY_TYPE
825 && TYPE_DOMAIN (type) == 0)
827 if (! DECL_EXTERNAL (decl))
828 warning_with_decl (decl, "array `%s' assumed to have one element");
830 complete_array_type (type, NULL_TREE, 1);
832 layout_decl (decl, 0);
837 /* Create a new `struct binding_level'. */
840 struct binding_level *
841 make_binding_level ()
844 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
847 /* Nonzero if we are currently in the global binding level. */
852 return current_binding_level == global_binding_level;
858 keep_next_level_flag = 1;
861 /* Nonzero if the current level needs to have a BLOCK made. */
866 return ((current_binding_level->keep_if_subblocks
867 && current_binding_level->blocks != 0)
868 || current_binding_level->keep
869 || current_binding_level->names != 0
870 || (current_binding_level->tags != 0
871 && !current_binding_level->tag_transparent));
874 /* Identify this binding level as a level of parameters.
875 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
876 But it turns out there is no way to pass the right value for
877 DEFINITION_FLAG, so we ignore it. */
880 declare_parm_level (definition_flag)
881 int definition_flag ATTRIBUTE_UNUSED;
883 current_binding_level->parm_flag = 1;
886 /* Nonzero if currently making parm declarations. */
891 return current_binding_level->parm_flag;
894 /* Enter a new binding level.
895 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
896 not for that of tags. */
899 pushlevel (tag_transparent)
902 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
904 /* If this is the top level of a function,
905 just make sure that NAMED_LABELS is 0. */
907 if (current_binding_level == global_binding_level)
912 /* Reuse or create a struct for this binding level. */
914 if (free_binding_level)
916 newlevel = free_binding_level;
917 free_binding_level = free_binding_level->level_chain;
921 newlevel = make_binding_level ();
924 /* Add this level to the front of the chain (stack) of levels that
927 *newlevel = clear_binding_level;
928 newlevel->tag_transparent
930 || (current_binding_level
931 ? current_binding_level->subblocks_tag_transparent
933 newlevel->level_chain = current_binding_level;
934 current_binding_level = newlevel;
935 newlevel->keep = keep_next_level_flag;
936 keep_next_level_flag = 0;
937 newlevel->keep_if_subblocks = keep_next_if_subblocks;
938 keep_next_if_subblocks = 0;
941 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
944 clear_limbo_values (block)
949 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
950 if (DECL_NAME (tem) != 0)
951 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
953 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
954 clear_limbo_values (tem);
957 /* Exit a binding level.
958 Pop the level off, and restore the state of the identifier-decl mappings
959 that were in effect when this level was entered.
961 If KEEP is nonzero, this level had explicit declarations, so
962 and create a "block" (a BLOCK node) for the level
963 to record its declarations and subblocks for symbol table output.
965 If FUNCTIONBODY is nonzero, this level is the body of a function,
966 so create a block as if KEEP were set and also clear out all
969 If REVERSE is nonzero, reverse the order of decls before putting
970 them into the BLOCK. */
973 poplevel (keep, reverse, functionbody)
979 /* The chain of decls was accumulated in reverse order.
980 Put it into forward order, just for cleanliness. */
982 tree tags = current_binding_level->tags;
983 tree subblocks = current_binding_level->blocks;
986 int block_previously_created;
988 keep |= current_binding_level->keep;
990 /* This warning is turned off because it causes warnings for
991 declarations like `extern struct foo *x'. */
993 /* Warn about incomplete structure types in this level. */
994 for (link = tags; link; link = TREE_CHAIN (link))
995 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
997 tree type = TREE_VALUE (link);
998 tree type_name = TYPE_NAME (type);
999 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1001 : DECL_NAME (type_name));
1002 switch (TREE_CODE (type))
1005 error ("`struct %s' incomplete in scope ending here", id);
1008 error ("`union %s' incomplete in scope ending here", id);
1011 error ("`enum %s' incomplete in scope ending here", id);
1017 /* Get the decls in the order they were written.
1018 Usually current_binding_level->names is in reverse order.
1019 But parameter decls were previously put in forward order. */
1022 current_binding_level->names
1023 = decls = nreverse (current_binding_level->names);
1025 decls = current_binding_level->names;
1027 /* Output any nested inline functions within this block
1028 if they weren't already output. */
1030 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1031 if (TREE_CODE (decl) == FUNCTION_DECL
1032 && ! TREE_ASM_WRITTEN (decl)
1033 && DECL_INITIAL (decl) != 0
1034 && TREE_ADDRESSABLE (decl))
1036 /* If this decl was copied from a file-scope decl
1037 on account of a block-scope extern decl,
1038 propagate TREE_ADDRESSABLE to the file-scope decl.
1040 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1041 true, since then the decl goes through save_for_inline_copying. */
1042 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1043 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1044 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1045 else if (DECL_SAVED_INSNS (decl) != 0)
1047 push_function_context ();
1048 output_inline_function (decl);
1049 pop_function_context ();
1053 /* If there were any declarations or structure tags in that level,
1054 or if this level is a function body,
1055 create a BLOCK to record them for the life of this function. */
1058 block_previously_created = (current_binding_level->this_block != 0);
1059 if (block_previously_created)
1060 block = current_binding_level->this_block;
1061 else if (keep || functionbody
1062 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1063 block = make_node (BLOCK);
1066 BLOCK_VARS (block) = decls;
1067 BLOCK_SUBBLOCKS (block) = subblocks;
1070 /* In each subblock, record that this is its superior. */
1072 for (link = subblocks; link; link = TREE_CHAIN (link))
1073 BLOCK_SUPERCONTEXT (link) = block;
1075 /* Clear out the meanings of the local variables of this level. */
1077 for (link = decls; link; link = TREE_CHAIN (link))
1079 if (DECL_NAME (link) != 0)
1081 /* If the ident. was used or addressed via a local extern decl,
1082 don't forget that fact. */
1083 if (DECL_EXTERNAL (link))
1085 if (TREE_USED (link))
1086 TREE_USED (DECL_NAME (link)) = 1;
1087 if (TREE_ADDRESSABLE (link))
1088 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1090 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1094 /* Restore all name-meanings of the outer levels
1095 that were shadowed by this level. */
1097 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1098 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1100 /* If the level being exited is the top level of a function,
1101 check over all the labels, and clear out the current
1102 (function local) meanings of their names. */
1106 clear_limbo_values (block);
1108 /* If this is the top level block of a function,
1109 the vars are the function's parameters.
1110 Don't leave them in the BLOCK because they are
1111 found in the FUNCTION_DECL instead. */
1113 BLOCK_VARS (block) = 0;
1115 /* Clear out the definitions of all label names,
1116 since their scopes end here,
1117 and add them to BLOCK_VARS. */
1119 for (link = named_labels; link; link = TREE_CHAIN (link))
1121 register tree label = TREE_VALUE (link);
1123 if (DECL_INITIAL (label) == 0)
1125 error_with_decl (label, "label `%s' used but not defined");
1126 /* Avoid crashing later. */
1127 define_label (input_filename, lineno,
1130 else if (warn_unused_label && !TREE_USED (label))
1131 warning_with_decl (label, "label `%s' defined but not used");
1132 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1134 /* Put the labels into the "variables" of the
1135 top-level block, so debugger can see them. */
1136 TREE_CHAIN (label) = BLOCK_VARS (block);
1137 BLOCK_VARS (block) = label;
1141 /* Pop the current level, and free the structure for reuse. */
1144 register struct binding_level *level = current_binding_level;
1145 current_binding_level = current_binding_level->level_chain;
1147 level->level_chain = free_binding_level;
1148 free_binding_level = level;
1151 /* Dispose of the block that we just made inside some higher level. */
1153 DECL_INITIAL (current_function_decl) = block;
1156 if (!block_previously_created)
1157 current_binding_level->blocks
1158 = chainon (current_binding_level->blocks, block);
1160 /* If we did not make a block for the level just exited,
1161 any blocks made for inner levels
1162 (since they cannot be recorded as subblocks in that level)
1163 must be carried forward so they will later become subblocks
1164 of something else. */
1166 current_binding_level->blocks
1167 = chainon (current_binding_level->blocks, subblocks);
1169 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1170 binding contour so that they point to the appropriate construct, i.e.
1171 either to the current FUNCTION_DECL node, or else to the BLOCK node
1172 we just constructed.
1174 Note that for tagged types whose scope is just the formal parameter
1175 list for some function type specification, we can't properly set
1176 their TYPE_CONTEXTs here, because we don't have a pointer to the
1177 appropriate FUNCTION_TYPE node readily available to us. For those
1178 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1179 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1180 node which will represent the "scope" for these "parameter list local"
1185 for (link = tags; link; link = TREE_CHAIN (link))
1186 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1188 for (link = tags; link; link = TREE_CHAIN (link))
1189 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1192 TREE_USED (block) = 1;
1196 /* Delete the node BLOCK from the current binding level.
1197 This is used for the block inside a stmt expr ({...})
1198 so that the block can be reinserted where appropriate. */
1201 delete_block (block)
1205 if (current_binding_level->blocks == block)
1206 current_binding_level->blocks = TREE_CHAIN (block);
1207 for (t = current_binding_level->blocks; t;)
1209 if (TREE_CHAIN (t) == block)
1210 TREE_CHAIN (t) = TREE_CHAIN (block);
1214 TREE_CHAIN (block) = NULL;
1215 /* Clear TREE_USED which is always set by poplevel.
1216 The flag is set again if insert_block is called. */
1217 TREE_USED (block) = 0;
1220 /* Insert BLOCK at the end of the list of subblocks of the
1221 current binding level. This is used when a BIND_EXPR is expanded,
1222 to handle the BLOCK node inside the BIND_EXPR. */
1225 insert_block (block)
1228 TREE_USED (block) = 1;
1229 current_binding_level->blocks
1230 = chainon (current_binding_level->blocks, block);
1233 /* Set the BLOCK node for the innermost scope
1234 (the one we are currently in). */
1238 register tree block;
1240 current_binding_level->this_block = block;
1246 register struct binding_level *newlevel;
1248 /* Reuse or create a struct for this binding level. */
1250 if (free_binding_level)
1252 newlevel = free_binding_level;
1253 free_binding_level = free_binding_level->level_chain;
1257 newlevel = make_binding_level ();
1260 /* Add this level to the front of the chain (stack) of label levels. */
1262 newlevel->level_chain = label_level_chain;
1263 label_level_chain = newlevel;
1265 newlevel->names = named_labels;
1266 newlevel->shadowed = shadowed_labels;
1268 shadowed_labels = 0;
1274 register struct binding_level *level = label_level_chain;
1277 /* Clear out the definitions of the declared labels in this level.
1278 Leave in the list any ordinary, non-declared labels. */
1279 for (link = named_labels, prev = 0; link;)
1281 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1283 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1285 error_with_decl (TREE_VALUE (link),
1286 "label `%s' used but not defined");
1287 /* Avoid crashing later. */
1288 define_label (input_filename, lineno,
1289 DECL_NAME (TREE_VALUE (link)));
1291 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1292 warning_with_decl (TREE_VALUE (link),
1293 "label `%s' defined but not used");
1294 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1296 /* Delete this element from the list. */
1297 link = TREE_CHAIN (link);
1299 TREE_CHAIN (prev) = link;
1301 named_labels = link;
1306 link = TREE_CHAIN (link);
1310 /* Bring back all the labels that were shadowed. */
1311 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1312 if (DECL_NAME (TREE_VALUE (link)) != 0)
1313 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1314 = TREE_VALUE (link);
1316 named_labels = chainon (named_labels, level->names);
1317 shadowed_labels = level->shadowed;
1319 /* Pop the current level, and free the structure for reuse. */
1320 label_level_chain = label_level_chain->level_chain;
1321 level->level_chain = free_binding_level;
1322 free_binding_level = level;
1325 /* Push a definition or a declaration of struct, union or enum tag "name".
1326 "type" should be the type node.
1327 We assume that the tag "name" is not already defined.
1329 Note that the definition may really be just a forward reference.
1330 In that case, the TYPE_SIZE will be zero. */
1333 pushtag (name, type)
1336 register struct binding_level *b;
1338 /* Find the proper binding level for this type tag. */
1340 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1345 /* Record the identifier as the type's name if it has none. */
1347 if (TYPE_NAME (type) == 0)
1348 TYPE_NAME (type) = name;
1351 b->tags = tree_cons (name, type, b->tags);
1353 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1354 tagged type we just added to the current binding level. This fake
1355 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1356 to output a representation of a tagged type, and it also gives
1357 us a convenient place to record the "scope start" address for the
1360 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1362 /* An approximation for now, so we can tell this is a function-scope tag.
1363 This will be updated in poplevel. */
1364 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1367 /* Handle when a new declaration NEWDECL
1368 has the same name as an old one OLDDECL
1369 in the same binding contour.
1370 Prints an error message if appropriate.
1372 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1373 Otherwise, return 0.
1375 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1376 and OLDDECL is in an outer binding level and should thus not be changed. */
1379 duplicate_decls (newdecl, olddecl, different_binding_level)
1380 register tree newdecl, olddecl;
1381 int different_binding_level;
1383 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1384 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1385 && DECL_INITIAL (newdecl) != 0);
1386 tree oldtype = TREE_TYPE (olddecl);
1387 tree newtype = TREE_TYPE (newdecl);
1390 if (DECL_P (olddecl))
1391 DECL_MACHINE_ATTRIBUTES (newdecl)
1392 = merge_machine_decl_attributes (olddecl, newdecl);
1394 if (TREE_CODE (newtype) == ERROR_MARK
1395 || TREE_CODE (oldtype) == ERROR_MARK)
1398 /* New decl is completely inconsistent with the old one =>
1399 tell caller to replace the old one.
1400 This is always an error except in the case of shadowing a builtin. */
1401 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 if (TREE_CODE (olddecl) == FUNCTION_DECL
1404 && (DECL_BUILT_IN (olddecl)
1405 || DECL_BUILT_IN_NONANSI (olddecl)))
1407 /* If you declare a built-in or predefined function name as static,
1408 the old definition is overridden,
1409 but optionally warn this was a bad choice of name. */
1410 if (!TREE_PUBLIC (newdecl))
1414 else if (DECL_BUILT_IN (olddecl))
1415 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1417 warning_with_decl (newdecl, "shadowing library function `%s'");
1419 /* Likewise, if the built-in is not ansi, then programs can
1420 override it even globally without an error. */
1421 else if (! DECL_BUILT_IN (olddecl))
1422 warning_with_decl (newdecl,
1423 "library function `%s' declared as non-function");
1425 else if (DECL_BUILT_IN_NONANSI (olddecl))
1426 warning_with_decl (newdecl,
1427 "built-in function `%s' declared as non-function");
1429 warning_with_decl (newdecl,
1430 "built-in function `%s' declared as non-function");
1434 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1435 error_with_decl (olddecl, "previous declaration of `%s'");
1441 /* For real parm decl following a forward decl,
1442 return 1 so old decl will be reused. */
1443 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1444 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1447 /* The new declaration is the same kind of object as the old one.
1448 The declarations may partially match. Print warnings if they don't
1449 match enough. Ultimately, copy most of the information from the new
1450 decl to the old one, and keep using the old one. */
1452 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1453 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1454 && DECL_INITIAL (olddecl) == 0)
1455 /* If -traditional, avoid error for redeclaring fcn
1456 after implicit decl. */
1458 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1459 && DECL_BUILT_IN (olddecl))
1461 /* A function declaration for a built-in function. */
1462 if (!TREE_PUBLIC (newdecl))
1464 /* If you declare a built-in function name as static, the
1465 built-in definition is overridden,
1466 but optionally warn this was a bad choice of name. */
1468 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1469 /* Discard the old built-in function. */
1472 else if (!types_match)
1474 /* Accept the return type of the new declaration if same modes. */
1475 tree oldreturntype = TREE_TYPE (oldtype);
1476 tree newreturntype = TREE_TYPE (newtype);
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;
1516 /* If types don't match for a built-in, throw away the built-in. */
1517 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1521 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1522 && DECL_SOURCE_LINE (olddecl) == 0)
1524 /* A function declaration for a predeclared function
1525 that isn't actually built in. */
1526 if (!TREE_PUBLIC (newdecl))
1528 /* If you declare it as static, the
1529 default definition is overridden. */
1532 else if (!types_match)
1534 /* If the types don't match, preserve volatility indication.
1535 Later on, we will discard everything else about the
1536 default declaration. */
1537 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1540 /* Permit char *foo () to match void *foo (...) if not pedantic,
1541 if one of them came from a system header file. */
1542 else if (!types_match
1543 && TREE_CODE (olddecl) == FUNCTION_DECL
1544 && TREE_CODE (newdecl) == FUNCTION_DECL
1545 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1546 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1547 && (DECL_IN_SYSTEM_HEADER (olddecl)
1548 || DECL_IN_SYSTEM_HEADER (newdecl))
1549 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1550 && TYPE_ARG_TYPES (oldtype) == 0
1551 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1552 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1554 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1555 && TYPE_ARG_TYPES (newtype) == 0
1556 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1557 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1560 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1561 /* Make sure we keep void * as ret type, not char *. */
1562 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1563 TREE_TYPE (newdecl) = newtype = oldtype;
1565 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1566 we will come back here again. */
1567 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1569 else if (!types_match
1570 /* Permit char *foo (int, ...); followed by char *foo ();
1572 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1574 /* Return types must still match. */
1575 && comptypes (TREE_TYPE (oldtype),
1576 TREE_TYPE (newtype))
1577 && TYPE_ARG_TYPES (newtype) == 0))
1579 error_with_decl (newdecl, "conflicting types for `%s'");
1580 /* Check for function type mismatch
1581 involving an empty arglist vs a nonempty one. */
1582 if (TREE_CODE (olddecl) == FUNCTION_DECL
1583 && comptypes (TREE_TYPE (oldtype),
1584 TREE_TYPE (newtype))
1585 && ((TYPE_ARG_TYPES (oldtype) == 0
1586 && DECL_INITIAL (olddecl) == 0)
1588 (TYPE_ARG_TYPES (newtype) == 0
1589 && DECL_INITIAL (newdecl) == 0)))
1591 /* Classify the problem further. */
1592 register tree t = TYPE_ARG_TYPES (oldtype);
1594 t = TYPE_ARG_TYPES (newtype);
1595 for (; t; t = TREE_CHAIN (t))
1597 register tree type = TREE_VALUE (t);
1599 if (TREE_CHAIN (t) == 0
1600 && TYPE_MAIN_VARIANT (type) != void_type_node)
1602 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1606 if (simple_type_promotes_to (type) != NULL_TREE)
1608 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1613 error_with_decl (olddecl, "previous declaration of `%s'");
1617 errmsg = redeclaration_error_message (newdecl, olddecl);
1623 error_with_decl (newdecl, "redefinition of `%s'");
1626 error_with_decl (newdecl, "redeclaration of `%s'");
1629 error_with_decl (newdecl, "conflicting declarations of `%s'");
1635 error_with_decl (olddecl,
1636 ((DECL_INITIAL (olddecl)
1637 && current_binding_level == global_binding_level)
1638 ? "`%s' previously defined here"
1639 : "`%s' previously declared here"));
1641 else if (TREE_CODE (newdecl) == TYPE_DECL
1642 && (DECL_IN_SYSTEM_HEADER (olddecl)
1643 || DECL_IN_SYSTEM_HEADER (newdecl)))
1645 warning_with_decl (newdecl, "redefinition of `%s'");
1648 ((DECL_INITIAL (olddecl)
1649 && current_binding_level == global_binding_level)
1650 ? "`%s' previously defined here"
1651 : "`%s' previously declared here"));
1653 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1654 && DECL_INITIAL (olddecl) != 0
1655 && TYPE_ARG_TYPES (oldtype) == 0
1656 && TYPE_ARG_TYPES (newtype) != 0
1657 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1659 register tree type, parm;
1661 /* Prototype decl follows defn w/o prototype. */
1663 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1664 type = TYPE_ARG_TYPES (newtype),
1667 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1669 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1670 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1672 warning_with_decl (newdecl, "prototype for `%s' follows");
1673 warning_with_decl (olddecl, "non-prototype definition here");
1676 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1677 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1679 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1680 error_with_decl (olddecl, "non-prototype definition here");
1684 /* Type for passing arg must be consistent
1685 with that declared for the arg. */
1686 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1687 /* If -traditional, allow `unsigned int' instead of `int'
1688 in the prototype. */
1689 && (! (flag_traditional
1690 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1691 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1693 error_with_decl (newdecl,
1694 "prototype for `%s' follows and argument %d doesn't match",
1696 error_with_decl (olddecl, "non-prototype definition here");
1702 /* Warn about mismatches in various flags. */
1705 /* Warn if function is now inline
1706 but was previously declared not inline and has been called. */
1707 if (TREE_CODE (olddecl) == FUNCTION_DECL
1708 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1709 && TREE_USED (olddecl))
1710 warning_with_decl (newdecl,
1711 "`%s' declared inline after being called");
1712 if (TREE_CODE (olddecl) == FUNCTION_DECL
1713 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1714 && DECL_INITIAL (olddecl) != 0)
1715 warning_with_decl (newdecl,
1716 "`%s' declared inline after its definition");
1718 /* If pedantic, warn when static declaration follows a non-static
1719 declaration. Otherwise, do so only for functions. */
1720 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1721 && TREE_PUBLIC (olddecl)
1722 && !TREE_PUBLIC (newdecl))
1723 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1725 /* If warn_traditional, warn when a non-static function
1726 declaration follows a static one. */
1727 if (warn_traditional
1728 && TREE_CODE (olddecl) == FUNCTION_DECL
1729 && !TREE_PUBLIC (olddecl)
1730 && TREE_PUBLIC (newdecl))
1731 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1733 /* Warn when const declaration follows a non-const
1734 declaration, but not for functions. */
1735 if (TREE_CODE (olddecl) != FUNCTION_DECL
1736 && !TREE_READONLY (olddecl)
1737 && TREE_READONLY (newdecl))
1738 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1739 /* These bits are logically part of the type, for variables.
1740 But not for functions
1741 (where qualifiers are not valid ANSI anyway). */
1742 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1743 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1744 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1745 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1749 /* Optionally warn about more than one declaration for the same name. */
1750 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1751 /* Don't warn about a function declaration
1752 followed by a definition. */
1753 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1754 && DECL_INITIAL (olddecl) == 0)
1755 /* Don't warn about extern decl followed by (tentative) definition. */
1756 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1758 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1759 warning_with_decl (olddecl, "previous declaration of `%s'");
1762 /* Copy all the DECL_... slots specified in the new decl
1763 except for any that we copy here from the old type.
1765 Past this point, we don't change OLDTYPE and NEWTYPE
1766 even if we change the types of NEWDECL and OLDDECL. */
1770 /* When copying info to olddecl, we store into write_olddecl
1771 instead. This allows us to avoid modifying olddecl when
1772 different_binding_level is true. */
1773 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1775 /* Merge the data types specified in the two decls. */
1776 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1778 if (different_binding_level)
1780 = build_type_attribute_variant
1782 merge_attributes (TYPE_ATTRIBUTES (newtype),
1783 TYPE_ATTRIBUTES (oldtype)));
1786 = TREE_TYPE (olddecl)
1787 = common_type (newtype, oldtype);
1790 /* Lay the type out, unless already done. */
1791 if (oldtype != TREE_TYPE (newdecl))
1793 if (TREE_TYPE (newdecl) != error_mark_node)
1794 layout_type (TREE_TYPE (newdecl));
1795 if (TREE_CODE (newdecl) != FUNCTION_DECL
1796 && TREE_CODE (newdecl) != TYPE_DECL
1797 && TREE_CODE (newdecl) != CONST_DECL)
1798 layout_decl (newdecl, 0);
1802 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1803 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1804 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1805 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1806 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1807 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1809 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1810 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1814 /* Keep the old rtl since we can safely use it. */
1815 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1817 /* Merge the type qualifiers. */
1818 if (TREE_CODE (olddecl) == FUNCTION_DECL
1819 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1820 && ! TREE_THIS_VOLATILE (newdecl))
1821 TREE_THIS_VOLATILE (write_olddecl) = 0;
1823 if (TREE_READONLY (newdecl))
1824 TREE_READONLY (write_olddecl) = 1;
1826 if (TREE_THIS_VOLATILE (newdecl))
1828 TREE_THIS_VOLATILE (write_olddecl) = 1;
1829 if (TREE_CODE (newdecl) == VAR_DECL)
1830 make_var_volatile (newdecl);
1833 /* Keep source location of definition rather than declaration. */
1834 /* When called with different_binding_level set, keep the old
1835 information so that meaningful diagnostics can be given. */
1836 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1837 && ! different_binding_level)
1839 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1840 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1843 /* Merge the unused-warning information. */
1844 if (DECL_IN_SYSTEM_HEADER (olddecl))
1845 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1846 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1847 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1849 /* Merge the initialization information. */
1850 /* When called with different_binding_level set, don't copy over
1851 DECL_INITIAL, so that we don't accidentally change function
1852 declarations into function definitions. */
1853 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1854 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1856 /* Merge the section attribute.
1857 We want to issue an error if the sections conflict but that must be
1858 done later in decl_attributes since we are called before attributes
1860 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1861 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1863 /* Copy the assembler name.
1864 Currently, it can only be defined in the prototype. */
1865 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1867 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1869 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1870 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1872 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1873 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1874 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1875 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1876 DECL_NO_LIMIT_STACK (newdecl)
1877 |= DECL_NO_LIMIT_STACK (olddecl);
1880 /* If cannot merge, then use the new type and qualifiers,
1881 and don't preserve the old rtl. */
1882 else if (! different_binding_level)
1884 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1885 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1886 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1887 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1890 /* Merge the storage class information. */
1891 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1892 /* For functions, static overrides non-static. */
1893 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1895 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1896 /* This is since we don't automatically
1897 copy the attributes of NEWDECL into OLDDECL. */
1898 /* No need to worry about different_binding_level here because
1899 then TREE_PUBLIC (newdecl) was true. */
1900 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1901 /* If this clears `static', clear it in the identifier too. */
1902 if (! TREE_PUBLIC (olddecl))
1903 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1905 if (DECL_EXTERNAL (newdecl))
1907 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1908 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1909 /* An extern decl does not override previous storage class. */
1910 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1911 if (! DECL_EXTERNAL (newdecl))
1912 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1916 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1917 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1920 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1922 /* If either decl says `inline', this fn is inline,
1923 unless its definition was passed already. */
1924 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1925 DECL_INLINE (olddecl) = 1;
1927 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1929 if (DECL_BUILT_IN (olddecl))
1931 /* Get rid of any built-in function if new arg types don't match it
1932 or if we have a function definition. */
1933 if (! types_match || new_is_definition)
1935 if (! different_binding_level)
1937 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1938 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1943 /* If redeclaring a builtin function, and not a definition,
1944 it stays built in. */
1945 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1946 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1949 /* Also preserve various other info from the definition. */
1950 else if (! new_is_definition)
1951 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1952 if (! new_is_definition)
1954 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1955 /* When called with different_binding_level set, don't copy over
1956 DECL_INITIAL, so that we don't accidentally change function
1957 declarations into function definitions. */
1958 if (! different_binding_level)
1959 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1960 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1961 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1962 if (DECL_INLINE (newdecl))
1963 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
1966 if (different_binding_level)
1968 /* Don't output a duplicate symbol or debugging information for this
1971 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1972 just have two declarations without a definition. VAR_DECLs may need
1973 the same treatment, I'm not sure. */
1974 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1975 DECL_IGNORED_P (newdecl) = 1;
1977 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1981 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1982 But preserve OLDDECL's DECL_UID. */
1984 register unsigned olddecl_uid = DECL_UID (olddecl);
1986 bcopy ((char *) newdecl + sizeof (struct tree_common),
1987 (char *) olddecl + sizeof (struct tree_common),
1988 sizeof (struct tree_decl) - sizeof (struct tree_common));
1989 DECL_UID (olddecl) = olddecl_uid;
1992 /* NEWDECL contains the merged attribute lists.
1993 Update OLDDECL to be the same. */
1994 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
1999 /* Record a decl-node X as belonging to the current lexical scope.
2000 Check for errors (such as an incompatible declaration for the same
2001 name already seen in the same scope).
2003 Returns either X or an old decl for the same name.
2004 If an old decl is returned, it may have been smashed
2005 to agree with what X says. */
2012 register tree name = DECL_NAME (x);
2013 register struct binding_level *b = current_binding_level;
2015 DECL_CONTEXT (x) = current_function_decl;
2016 /* A local extern declaration for a function doesn't constitute nesting.
2017 A local auto declaration does, since it's a forward decl
2018 for a nested function coming later. */
2019 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2020 && DECL_EXTERNAL (x))
2021 DECL_CONTEXT (x) = 0;
2023 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2024 && x != IDENTIFIER_IMPLICIT_DECL (name)
2025 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2026 && !DECL_IN_SYSTEM_HEADER (x))
2027 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2033 int different_binding_level = 0;
2035 t = lookup_name_current_level (name);
2036 /* Don't type check externs here when -traditional. This is so that
2037 code with conflicting declarations inside blocks will get warnings
2038 not errors. X11 for instance depends on this. */
2039 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2041 t = IDENTIFIER_GLOBAL_VALUE (name);
2042 /* Type decls at global scope don't conflict with externs declared
2043 inside lexical blocks. */
2044 if (t && TREE_CODE (t) == TYPE_DECL)
2046 different_binding_level = 1;
2048 if (t != 0 && t == error_mark_node)
2049 /* error_mark_node is 0 for a while during initialization! */
2052 error_with_decl (x, "`%s' used prior to declaration");
2057 file = DECL_SOURCE_FILE (t);
2058 line = DECL_SOURCE_LINE (t);
2061 /* If this decl is `static' and an implicit decl was seen previously,
2062 warn. But don't complain if -traditional,
2063 since traditional compilers don't complain. */
2064 if (! flag_traditional && TREE_PUBLIC (name)
2065 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2066 sets this for all functions. */
2067 && ! TREE_PUBLIC (x)
2068 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2069 /* We used to warn also for explicit extern followed by static,
2070 but sometimes you need to do it that way. */
2071 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2073 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2074 IDENTIFIER_POINTER (name));
2075 pedwarn_with_file_and_line
2076 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2077 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2078 "previous declaration of `%s'",
2079 IDENTIFIER_POINTER (name));
2080 TREE_THIS_VOLATILE (name) = 1;
2083 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2085 if (TREE_CODE (t) == PARM_DECL)
2087 /* Don't allow more than one "real" duplicate
2088 of a forward parm decl. */
2089 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2095 /* If we are processing a typedef statement, generate a whole new
2096 ..._TYPE node (which will be just an variant of the existing
2097 ..._TYPE node with identical properties) and then install the
2098 TYPE_DECL node generated to represent the typedef name as the
2099 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2101 The whole point here is to end up with a situation where each
2102 and every ..._TYPE node the compiler creates will be uniquely
2103 associated with AT MOST one node representing a typedef name.
2104 This way, even though the compiler substitutes corresponding
2105 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2106 early on, later parts of the compiler can always do the reverse
2107 translation and get back the corresponding typedef name. For
2110 typedef struct S MY_TYPE;
2113 Later parts of the compiler might only know that `object' was of
2114 type `struct S' if it were not for code just below. With this
2115 code however, later parts of the compiler see something like:
2117 struct S' == struct S
2118 typedef struct S' MY_TYPE;
2121 And they can then deduce (from the node for type struct S') that
2122 the original object declaration was:
2126 Being able to do this is important for proper support of protoize,
2127 and also for generating precise symbolic debugging information
2128 which takes full account of the programmer's (typedef) vocabulary.
2130 Obviously, we don't want to generate a duplicate ..._TYPE node if
2131 the TYPE_DECL node that we are now processing really represents a
2132 standard built-in type.
2134 Since all standard types are effectively declared at line zero
2135 in the source file, we can easily check to see if we are working
2136 on a standard type by checking the current value of lineno. */
2138 if (TREE_CODE (x) == TYPE_DECL)
2140 if (DECL_SOURCE_LINE (x) == 0)
2142 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2143 TYPE_NAME (TREE_TYPE (x)) = x;
2145 else if (TREE_TYPE (x) != error_mark_node
2146 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2148 tree tt = TREE_TYPE (x);
2149 DECL_ORIGINAL_TYPE (x) = tt;
2150 tt = build_type_copy (tt);
2152 TREE_USED (tt) = TREE_USED (x);
2157 /* Multiple external decls of the same identifier ought to match.
2158 Check against both global declarations (when traditional) and out of
2159 scope (limbo) block level declarations.
2161 We get warnings about inline functions where they are defined.
2162 Avoid duplicate warnings where they are used. */
2164 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2168 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2169 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2170 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2171 decl = IDENTIFIER_GLOBAL_VALUE (name);
2172 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2173 /* Decls in limbo are always extern, so no need to check that. */
2174 decl = IDENTIFIER_LIMBO_VALUE (name);
2178 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2179 /* If old decl is built-in, we already warned if we should. */
2180 && !DECL_BUILT_IN (decl))
2182 pedwarn_with_decl (x,
2183 "type mismatch with previous external decl");
2184 pedwarn_with_decl (decl, "previous external decl of `%s'");
2188 /* If a function has had an implicit declaration, and then is defined,
2189 make sure they are compatible. */
2191 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2192 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2193 && TREE_CODE (x) == FUNCTION_DECL
2194 && ! comptypes (TREE_TYPE (x),
2195 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2197 warning_with_decl (x, "type mismatch with previous implicit declaration");
2198 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2199 "previous implicit declaration of `%s'");
2202 /* In PCC-compatibility mode, extern decls of vars with no current decl
2203 take effect at top level no matter where they are. */
2204 if (flag_traditional && DECL_EXTERNAL (x)
2205 && lookup_name (name) == 0)
2207 tree type = TREE_TYPE (x);
2209 /* But don't do this if the type contains temporary nodes. */
2212 if (type == error_mark_node)
2214 if (TYPE_CONTEXT (type))
2216 warning_with_decl (x, "type of external `%s' is not global");
2217 /* By exiting the loop early, we leave TYPE nonzero,
2218 and thus prevent globalization of the decl. */
2221 else if (TREE_CODE (type) == FUNCTION_TYPE
2222 && TYPE_ARG_TYPES (type) != 0)
2223 /* The types might not be truly local,
2224 but the list of arg types certainly is temporary.
2225 Since prototypes are nontraditional,
2226 ok not to do the traditional thing. */
2228 type = TREE_TYPE (type);
2232 b = global_binding_level;
2235 /* This name is new in its binding level.
2236 Install the new declaration and return it. */
2237 if (b == global_binding_level)
2239 /* Install a global value. */
2241 /* If the first global decl has external linkage,
2242 warn if we later see static one. */
2243 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2244 TREE_PUBLIC (name) = 1;
2246 IDENTIFIER_GLOBAL_VALUE (name) = x;
2248 /* We no longer care about any previous block level declarations. */
2249 IDENTIFIER_LIMBO_VALUE (name) = 0;
2251 /* Don't forget if the function was used via an implicit decl. */
2252 if (IDENTIFIER_IMPLICIT_DECL (name)
2253 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2254 TREE_USED (x) = 1, TREE_USED (name) = 1;
2256 /* Don't forget if its address was taken in that way. */
2257 if (IDENTIFIER_IMPLICIT_DECL (name)
2258 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2259 TREE_ADDRESSABLE (x) = 1;
2261 /* Warn about mismatches against previous implicit decl. */
2262 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2263 /* If this real decl matches the implicit, don't complain. */
2264 && ! (TREE_CODE (x) == FUNCTION_DECL
2265 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2266 == integer_type_node)))
2267 pedwarn ("`%s' was previously implicitly declared to return `int'",
2268 IDENTIFIER_POINTER (name));
2270 /* If this decl is `static' and an `extern' was seen previously,
2271 that is erroneous. */
2272 if (TREE_PUBLIC (name)
2273 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2275 /* Okay to redeclare an ANSI built-in as static. */
2276 if (t != 0 && DECL_BUILT_IN (t))
2278 /* Okay to declare a non-ANSI built-in as anything. */
2279 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2281 /* Okay to have global type decl after an earlier extern
2282 declaration inside a lexical block. */
2283 else if (TREE_CODE (x) == TYPE_DECL)
2285 else if (IDENTIFIER_IMPLICIT_DECL (name))
2287 if (! TREE_THIS_VOLATILE (name))
2288 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2289 IDENTIFIER_POINTER (name));
2292 pedwarn ("`%s' was declared `extern' and later `static'",
2293 IDENTIFIER_POINTER (name));
2298 /* Here to install a non-global value. */
2299 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2300 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2302 IDENTIFIER_LOCAL_VALUE (name) = x;
2304 /* If this is an extern function declaration, see if we
2305 have a global definition or declaration for the function. */
2308 && TREE_CODE (x) == FUNCTION_DECL
2309 && TREE_CODE (oldglobal) == FUNCTION_DECL
2310 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2312 /* We have one. Their types must agree. */
2313 if (! comptypes (TREE_TYPE (x),
2314 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2315 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2318 /* Inner extern decl is inline if global one is.
2319 Copy enough to really inline it. */
2320 if (DECL_INLINE (oldglobal))
2322 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2323 DECL_INITIAL (x) = (current_function_decl == oldglobal
2324 ? 0 : DECL_INITIAL (oldglobal));
2325 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2326 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2327 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2328 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2329 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2330 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2332 /* Inner extern decl is built-in if global one is. */
2333 if (DECL_BUILT_IN (oldglobal))
2335 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2336 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2338 /* Keep the arg types from a file-scope fcn defn. */
2339 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2340 && DECL_INITIAL (oldglobal)
2341 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2342 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2346 #if 0 /* This case is probably sometimes the right thing to do. */
2347 /* If we have a local external declaration,
2348 then any file-scope declaration should not
2349 have been static. */
2350 if (oldlocal == 0 && oldglobal != 0
2351 && !TREE_PUBLIC (oldglobal)
2352 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2353 warning ("`%s' locally external but globally static",
2354 IDENTIFIER_POINTER (name));
2357 /* If we have a local external declaration,
2358 and no file-scope declaration has yet been seen,
2359 then if we later have a file-scope decl it must not be static. */
2361 && DECL_EXTERNAL (x)
2365 TREE_PUBLIC (name) = 1;
2367 /* Save this decl, so that we can do type checking against
2368 other decls after it falls out of scope.
2370 Only save it once. This prevents temporary decls created in
2371 expand_inline_function from being used here, since this
2372 will have been set when the inline function was parsed.
2373 It also helps give slightly better warnings. */
2374 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2375 IDENTIFIER_LIMBO_VALUE (name) = x;
2378 /* Warn if shadowing an argument at the top level of the body. */
2379 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2380 /* This warning doesn't apply to the parms of a nested fcn. */
2381 && ! current_binding_level->parm_flag
2382 /* Check that this is one level down from the parms. */
2383 && current_binding_level->level_chain->parm_flag
2384 /* Check that the decl being shadowed
2385 comes from the parm level, one level up. */
2386 && chain_member (oldlocal, current_binding_level->level_chain->names))
2388 if (TREE_CODE (oldlocal) == PARM_DECL)
2389 pedwarn ("declaration of `%s' shadows a parameter",
2390 IDENTIFIER_POINTER (name));
2392 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2393 IDENTIFIER_POINTER (name));
2396 /* Maybe warn if shadowing something else. */
2397 else if (warn_shadow && !DECL_EXTERNAL (x)
2398 /* No shadow warnings for internally generated vars. */
2399 && DECL_SOURCE_LINE (x) != 0
2400 /* No shadow warnings for vars made for inlining. */
2401 && ! DECL_FROM_INLINE (x))
2403 char *id = IDENTIFIER_POINTER (name);
2405 if (TREE_CODE (x) == PARM_DECL
2406 && current_binding_level->level_chain->parm_flag)
2407 /* Don't warn about the parm names in function declarator
2408 within a function declarator.
2409 It would be nice to avoid warning in any function
2410 declarator in a declaration, as opposed to a definition,
2411 but there is no way to tell it's not a definition. */
2413 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2414 warning ("declaration of `%s' shadows a parameter", id);
2415 else if (oldlocal != 0)
2416 warning ("declaration of `%s' shadows previous local", id);
2417 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2418 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2419 warning ("declaration of `%s' shadows global declaration", id);
2422 /* If storing a local value, there may already be one (inherited).
2423 If so, record it for restoration when this binding level ends. */
2425 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2428 /* Keep count of variables in this level with incomplete type.
2429 If the input is erroneous, we can have error_mark in the type
2430 slot (e.g. "f(void a, ...)") - that doesn't count as an
2432 if (TREE_TYPE (x) != error_mark_node
2433 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2437 /* Put decls on list in reverse order.
2438 We will reverse them later if necessary. */
2439 TREE_CHAIN (x) = b->names;
2445 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2448 pushdecl_top_level (x)
2452 register struct binding_level *b = current_binding_level;
2454 current_binding_level = global_binding_level;
2456 current_binding_level = b;
2460 /* Generate an implicit declaration for identifier FUNCTIONID
2461 as a function of type int (). Print a warning if appropriate. */
2464 implicitly_declare (functionid)
2468 int traditional_warning = 0;
2469 /* Only one "implicit declaration" warning per identifier. */
2470 int implicit_warning;
2472 /* We used to reuse an old implicit decl here,
2473 but this loses with inline functions because it can clobber
2474 the saved decl chains. */
2475 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2476 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2478 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2480 /* Warn of implicit decl following explicit local extern decl.
2481 This is probably a program designed for traditional C. */
2482 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2483 traditional_warning = 1;
2485 /* Warn once of an implicit declaration. */
2486 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2488 DECL_EXTERNAL (decl) = 1;
2489 TREE_PUBLIC (decl) = 1;
2491 /* Record that we have an implicit decl and this is it. */
2492 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2494 /* ANSI standard says implicit declarations are in the innermost block.
2495 So we record the decl in the standard fashion.
2496 If flag_traditional is set, pushdecl does it top-level. */
2499 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2500 maybe_objc_check_decl (decl);
2502 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2504 if (mesg_implicit_function_declaration && implicit_warning)
2506 if (mesg_implicit_function_declaration == 2)
2507 error ("implicit declaration of function `%s'",
2508 IDENTIFIER_POINTER (functionid));
2510 warning ("implicit declaration of function `%s'",
2511 IDENTIFIER_POINTER (functionid));
2513 else if (warn_traditional && traditional_warning)
2514 warning ("function `%s' was previously declared within a block",
2515 IDENTIFIER_POINTER (functionid));
2517 /* Write a record describing this implicit function declaration to the
2518 prototypes file (if requested). */
2520 gen_aux_info_record (decl, 0, 1, 0);
2525 /* Return zero if the declaration NEWDECL is valid
2526 when the declaration OLDDECL (assumed to be for the same name)
2527 has already been seen.
2528 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2529 and 3 if it is a conflicting declaration. */
2532 redeclaration_error_message (newdecl, olddecl)
2533 tree newdecl, olddecl;
2535 if (TREE_CODE (newdecl) == TYPE_DECL)
2537 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2539 /* pushdecl creates distinct types for TYPE_DECLs by calling
2540 build_type_copy, so the above comparison generally fails. We do
2541 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2542 is equivalent to what this code used to do before the build_type_copy
2543 call. The variant type distinction should not matter for traditional
2544 code, because it doesn't have type qualifiers. */
2545 if (flag_traditional
2546 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2548 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2552 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2554 /* Declarations of functions can insist on internal linkage
2555 but they can't be inconsistent with internal linkage,
2556 so there can be no error on that account.
2557 However defining the same name twice is no good. */
2558 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2559 /* However, defining once as extern inline and a second
2560 time in another way is ok. */
2561 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2562 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2566 else if (current_binding_level == global_binding_level)
2568 /* Objects declared at top level: */
2569 /* If at least one is a reference, it's ok. */
2570 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2572 /* Reject two definitions. */
2573 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2575 /* Now we have two tentative defs, or one tentative and one real def. */
2576 /* Insist that the linkage match. */
2577 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2581 else if (current_binding_level->parm_flag
2582 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2586 /* Newdecl has block scope. If olddecl has block scope also, then
2587 reject two definitions, and reject a definition together with an
2588 external reference. Otherwise, it is OK, because newdecl must
2589 be an extern reference to olddecl. */
2590 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2591 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2597 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2598 Create one if none exists so far for the current function.
2599 This function is called for both label definitions and label references. */
2605 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2607 if (current_function_decl == 0)
2609 error ("label %s referenced outside of any function",
2610 IDENTIFIER_POINTER (id));
2614 /* Use a label already defined or ref'd with this name. */
2617 /* But not if it is inherited and wasn't declared to be inheritable. */
2618 if (DECL_CONTEXT (decl) != current_function_decl
2619 && ! C_DECLARED_LABEL_FLAG (decl))
2620 return shadow_label (id);
2624 decl = build_decl (LABEL_DECL, id, void_type_node);
2626 /* Make sure every label has an rtx. */
2629 /* A label not explicitly declared must be local to where it's ref'd. */
2630 DECL_CONTEXT (decl) = current_function_decl;
2632 DECL_MODE (decl) = VOIDmode;
2634 /* Say where one reference is to the label,
2635 for the sake of the error if it is not defined. */
2636 DECL_SOURCE_LINE (decl) = lineno;
2637 DECL_SOURCE_FILE (decl) = input_filename;
2639 IDENTIFIER_LABEL_VALUE (id) = decl;
2641 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2646 /* Make a label named NAME in the current function,
2647 shadowing silently any that may be inherited from containing functions
2648 or containing scopes.
2650 Note that valid use, if the label being shadowed
2651 comes from another scope in the same function,
2652 requires calling declare_nonlocal_label right away. */
2658 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2664 /* Check to make sure that the label hasn't already been declared
2665 at this label scope */
2666 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2667 if (TREE_VALUE (dup) == decl)
2669 error ("duplicate label declaration `%s'",
2670 IDENTIFIER_POINTER (name));
2671 error_with_decl (TREE_VALUE (dup),
2672 "this is a previous declaration");
2673 /* Just use the previous declaration. */
2674 return lookup_label (name);
2677 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2678 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2681 return lookup_label (name);
2684 /* Define a label, specifying the location in the source file.
2685 Return the LABEL_DECL node for the label, if the definition is valid.
2686 Otherwise return 0. */
2689 define_label (filename, line, name)
2690 const char *filename;
2694 tree decl = lookup_label (name);
2696 /* If label with this name is known from an outer context, shadow it. */
2697 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2699 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2700 IDENTIFIER_LABEL_VALUE (name) = 0;
2701 decl = lookup_label (name);
2704 if (DECL_INITIAL (decl) != 0)
2706 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2711 /* Mark label as having been defined. */
2712 DECL_INITIAL (decl) = error_mark_node;
2713 /* Say where in the source. */
2714 DECL_SOURCE_FILE (decl) = filename;
2715 DECL_SOURCE_LINE (decl) = line;
2720 /* Return the list of declarations of the current level.
2721 Note that this list is in reverse order unless/until
2722 you nreverse it; and when you do nreverse it, you must
2723 store the result back using `storedecls' or you will lose. */
2728 return current_binding_level->names;
2731 /* Return the list of type-tags (for structs, etc) of the current level. */
2736 return current_binding_level->tags;
2739 /* Store the list of declarations of the current level.
2740 This is done for the parameter declarations of a function being defined,
2741 after they are modified in the light of any missing parameters. */
2747 current_binding_level->names = decls;
2750 /* Similarly, store the list of tags of the current level. */
2756 current_binding_level->tags = tags;
2759 /* Given NAME, an IDENTIFIER_NODE,
2760 return the structure (or union or enum) definition for that name.
2761 Searches binding levels from BINDING_LEVEL up to the global level.
2762 If THISLEVEL_ONLY is nonzero, searches only the specified context
2763 (but skips any tag-transparent contexts to find one that is
2764 meaningful for tags).
2765 CODE says which kind of type the caller wants;
2766 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2767 If the wrong kind of type is found, an error is reported. */
2770 lookup_tag (code, name, binding_level, thislevel_only)
2771 enum tree_code code;
2772 struct binding_level *binding_level;
2776 register struct binding_level *level;
2778 for (level = binding_level; level; level = level->level_chain)
2781 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2783 if (TREE_PURPOSE (tail) == name)
2785 if (TREE_CODE (TREE_VALUE (tail)) != code)
2787 /* Definition isn't the kind we were looking for. */
2788 pending_invalid_xref = name;
2789 pending_invalid_xref_file = input_filename;
2790 pending_invalid_xref_line = lineno;
2792 return TREE_VALUE (tail);
2795 if (thislevel_only && ! level->tag_transparent)
2801 /* Print an error message now
2802 for a recent invalid struct, union or enum cross reference.
2803 We don't print them immediately because they are not invalid
2804 when used in the `struct foo;' construct for shadowing. */
2807 pending_xref_error ()
2809 if (pending_invalid_xref != 0)
2810 error_with_file_and_line (pending_invalid_xref_file,
2811 pending_invalid_xref_line,
2812 "`%s' defined as wrong kind of tag",
2813 IDENTIFIER_POINTER (pending_invalid_xref));
2814 pending_invalid_xref = 0;
2817 /* Given a type, find the tag that was defined for it and return the tag name.
2818 Otherwise return 0. */
2821 lookup_tag_reverse (type)
2824 register struct binding_level *level;
2826 for (level = current_binding_level; level; level = level->level_chain)
2829 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2831 if (TREE_VALUE (tail) == type)
2832 return TREE_PURPOSE (tail);
2838 /* Look up NAME in the current binding level and its superiors
2839 in the namespace of variables, functions and typedefs.
2840 Return a ..._DECL node of some kind representing its definition,
2841 or return 0 if it is undefined. */
2848 if (current_binding_level != global_binding_level
2849 && IDENTIFIER_LOCAL_VALUE (name))
2850 val = IDENTIFIER_LOCAL_VALUE (name);
2852 val = IDENTIFIER_GLOBAL_VALUE (name);
2856 /* Similar to `lookup_name' but look only at current binding level. */
2859 lookup_name_current_level (name)
2864 if (current_binding_level == global_binding_level)
2865 return IDENTIFIER_GLOBAL_VALUE (name);
2867 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2870 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2871 if (DECL_NAME (t) == name)
2877 /* Mark ARG for GC. */
2880 mark_binding_level (arg)
2883 struct binding_level *level = *(struct binding_level **) arg;
2885 for (; level != 0; level = level->level_chain)
2887 ggc_mark_tree (level->names);
2888 ggc_mark_tree (level->tags);
2889 ggc_mark_tree (level->shadowed);
2890 ggc_mark_tree (level->blocks);
2891 ggc_mark_tree (level->this_block);
2892 ggc_mark_tree (level->parm_order);
2896 /* Create the predefined scalar types of C,
2897 and some nodes representing standard constants (0, 1, (void *) 0).
2898 Initialize the global binding level.
2899 Make definitions for built-in primitive functions. */
2902 init_decl_processing ()
2904 register tree endlink;
2905 tree ptr_ftype_void, ptr_ftype_ptr;
2906 int wchar_type_size;
2907 tree array_domain_type;
2910 current_function_decl = NULL;
2911 named_labels = NULL;
2912 current_binding_level = NULL_BINDING_LEVEL;
2913 free_binding_level = NULL_BINDING_LEVEL;
2914 pushlevel (0); /* make the binding_level structure for global names */
2915 global_binding_level = current_binding_level;
2917 build_common_tree_nodes (flag_signed_char);
2919 /* Define `int' and `char' first so that dbx will output them first. */
2920 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2921 integer_type_node));
2922 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2924 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2925 long_integer_type_node));
2926 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2927 unsigned_type_node));
2928 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2929 long_unsigned_type_node));
2930 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2931 long_long_integer_type_node));
2932 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2933 long_long_unsigned_type_node));
2934 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2935 short_integer_type_node));
2936 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2937 short_unsigned_type_node));
2938 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2939 signed_char_type_node));
2940 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2941 unsigned_char_type_node));
2942 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2943 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2944 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2945 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2946 #if HOST_BITS_PER_WIDE_INT >= 64
2947 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2949 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2950 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2951 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2952 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2953 #if HOST_BITS_PER_WIDE_INT >= 64
2954 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2957 /* `unsigned long' is the standard type for sizeof.
2958 Traditionally, use a signed type.
2959 Note that stddef.h uses `unsigned long',
2960 and this must agree, even if long and int are the same size. */
2961 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2962 if (flag_traditional && TREE_UNSIGNED (t))
2963 t = signed_type (t);
2967 /* Create the widest literal types. */
2968 widest_integer_literal_type_node
2969 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2970 widest_unsigned_literal_type_node
2971 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2972 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2973 widest_integer_literal_type_node));
2974 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2975 widest_unsigned_literal_type_node));
2977 build_common_tree_nodes_2 (flag_short_double);
2979 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2981 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2983 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2984 long_double_type_node));
2985 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2986 complex_integer_type_node));
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2988 complex_float_type_node));
2989 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2990 complex_double_type_node));
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2992 complex_long_double_type_node));
2993 pushdecl (build_decl (TYPE_DECL,
2994 ridpointers[(int) RID_VOID], void_type_node));
2996 #ifdef MD_INIT_BUILTINS
3000 wchar_type_node = get_identifier (flag_short_wchar
3001 ? "short unsigned int"
3003 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3004 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3005 signed_wchar_type_node = signed_type (wchar_type_node);
3006 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3008 boolean_type_node = integer_type_node;
3009 boolean_true_node = integer_one_node;
3010 boolean_false_node = integer_zero_node;
3012 string_type_node = build_pointer_type (char_type_node);
3013 const_string_type_node
3014 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3016 /* Make a type to be the domain of a few array types
3017 whose domains don't really matter.
3018 200 is small enough that it always fits in size_t
3019 and large enough that it can hold most function names for the
3020 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3021 array_domain_type = build_index_type (build_int_2 (200, 0));
3023 /* make a type for arrays of characters.
3024 With luck nothing will ever really depend on the length of this
3026 char_array_type_node
3027 = build_array_type (char_type_node, array_domain_type);
3029 /* Likewise for arrays of ints. */
3031 = build_array_type (integer_type_node, array_domain_type);
3033 /* This is for wide string constants. */
3034 wchar_array_type_node
3035 = build_array_type (wchar_type_node, array_domain_type);
3037 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3039 default_function_type
3040 = build_function_type (integer_type_node, NULL_TREE);
3042 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3044 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3046 endlink = void_list_node;
3047 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3049 = build_function_type (ptr_type_node,
3050 tree_cons (NULL_TREE, ptr_type_node, endlink));
3052 /* Types which are common to the fortran compiler and libf2c. When
3053 changing these, you also need to be concerned with f/com.h. */
3055 if (TYPE_PRECISION (float_type_node)
3056 == TYPE_PRECISION (long_integer_type_node))
3058 g77_integer_type_node = long_integer_type_node;
3059 g77_uinteger_type_node = long_unsigned_type_node;
3061 else if (TYPE_PRECISION (float_type_node)
3062 == TYPE_PRECISION (integer_type_node))
3064 g77_integer_type_node = integer_type_node;
3065 g77_uinteger_type_node = unsigned_type_node;
3068 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3070 if (g77_integer_type_node != NULL_TREE)
3072 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3073 g77_integer_type_node));
3074 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3075 g77_uinteger_type_node));
3078 if (TYPE_PRECISION (float_type_node) * 2
3079 == TYPE_PRECISION (long_integer_type_node))
3081 g77_longint_type_node = long_integer_type_node;
3082 g77_ulongint_type_node = long_unsigned_type_node;
3084 else if (TYPE_PRECISION (float_type_node) * 2
3085 == TYPE_PRECISION (long_long_integer_type_node))
3087 g77_longint_type_node = long_long_integer_type_node;
3088 g77_ulongint_type_node = long_long_unsigned_type_node;
3091 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3093 if (g77_longint_type_node != NULL_TREE)
3095 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3096 g77_longint_type_node));
3097 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3098 g77_ulongint_type_node));
3101 builtin_function ("__builtin_aggregate_incoming_address",
3102 build_function_type (ptr_type_node, NULL_TREE),
3103 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3104 BUILT_IN_NORMAL, NULL_PTR);
3106 /* Hooks for the DWARF 2 __throw routine. */
3107 builtin_function ("__builtin_unwind_init",
3108 build_function_type (void_type_node, endlink),
3109 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3110 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3111 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3112 builtin_function ("__builtin_dwarf_fp_regnum",
3113 build_function_type (unsigned_type_node, endlink),
3114 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3115 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3116 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3117 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3118 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3119 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3120 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3122 ("__builtin_eh_return",
3123 build_function_type (void_type_node,
3124 tree_cons (NULL_TREE, ptr_type_node,
3125 tree_cons (NULL_TREE,
3126 type_for_mode (ptr_mode, 0),
3127 tree_cons (NULL_TREE,
3130 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3132 pedantic_lvalues = pedantic;
3134 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3135 make_fname_decl = c_make_fname_decl;
3136 declare_function_name ();
3138 start_identifier_warnings ();
3140 /* Prepare to check format strings against argument lists. */
3141 init_function_format_info ();
3145 incomplete_decl_finalize_hook = finish_incomplete_decl;
3147 /* Record our roots. */
3149 ggc_add_tree_root (c_global_trees, CTI_MAX);
3150 ggc_add_tree_root (&named_labels, 1);
3151 ggc_add_tree_root (&shadowed_labels, 1);
3152 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3153 mark_binding_level);
3154 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3155 mark_binding_level);
3156 ggc_add_tree_root (&static_ctors, 1);
3157 ggc_add_tree_root (&static_dtors, 1);
3160 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3161 decl, NAME is the initialization string and TYPE_DEP indicates whether
3162 NAME depended on the type of the function. As we don't yet implement
3163 delayed emission of static data, we mark the decl as emitted
3164 so it is not placed in the output. Anything using it must therefore pull
3165 out the STRING_CST initializer directly. This does mean that these names
3166 are string merging candidates, which C99 does not permit. */
3169 c_make_fname_decl (id, name, type_dep)
3172 int type_dep ATTRIBUTE_UNUSED;
3174 tree decl, type, init;
3175 size_t length = strlen (name);
3177 type = build_array_type
3178 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3179 build_index_type (build_int_2 (length, 0)));
3181 decl = build_decl (VAR_DECL, id, type);
3182 TREE_STATIC (decl) = 1;
3183 TREE_READONLY (decl) = 1;
3184 TREE_ASM_WRITTEN (decl) = 1;
3185 DECL_SOURCE_LINE (decl) = 0;
3186 DECL_ARTIFICIAL (decl) = 1;
3187 DECL_IN_SYSTEM_HEADER (decl) = 1;
3188 DECL_IGNORED_P (decl) = 1;
3189 init = build_string (length + 1, name);
3190 TREE_TYPE (init) = type;
3191 DECL_INITIAL (decl) = init;
3192 finish_decl (pushdecl (decl), init, NULL_TREE);
3197 /* Return a definition for a builtin function named NAME and whose data type
3198 is TYPE. TYPE should be a function type with argument types.
3199 FUNCTION_CODE tells later passes how to compile calls to this function.
3200 See tree.h for its possible values.
3202 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3203 the name to be called if we can't opencode the function. */
3206 builtin_function (name, type, function_code, class, library_name)
3210 enum built_in_class class;
3211 const char *library_name;
3213 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3214 DECL_EXTERNAL (decl) = 1;
3215 TREE_PUBLIC (decl) = 1;
3216 /* If -traditional, permit redefining a builtin function any way you like.
3217 (Though really, if the program redefines these functions,
3218 it probably won't work right unless compiled with -fno-builtin.) */
3219 if (flag_traditional && name[0] != '_')
3220 DECL_BUILT_IN_NONANSI (decl) = 1;
3222 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3223 make_decl_rtl (decl, NULL_PTR, 1);
3225 DECL_BUILT_IN_CLASS (decl) = class;
3226 DECL_FUNCTION_CODE (decl) = function_code;
3228 /* Warn if a function in the namespace for users
3229 is used without an occasion to consider it declared. */
3230 if (name[0] != '_' || name[1] != '_')
3231 C_DECL_ANTICIPATED (decl) = 1;
3236 /* Called when a declaration is seen that contains no names to declare.
3237 If its type is a reference to a structure, union or enum inherited
3238 from a containing scope, shadow that tag name for the current scope
3239 with a forward reference.
3240 If its type defines a new named structure or union
3241 or defines an enum, it is valid but we need not do anything here.
3242 Otherwise, it is an error. */
3245 shadow_tag (declspecs)
3248 shadow_tag_warned (declspecs, 0);
3252 shadow_tag_warned (declspecs, warned)
3255 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3262 pending_invalid_xref = 0;
3264 /* Remove the attributes from declspecs, since they will confuse the
3266 split_specs_attrs (declspecs, &specs, &attrs);
3268 for (link = specs; link; link = TREE_CHAIN (link))
3270 register tree value = TREE_VALUE (link);
3271 register enum tree_code code = TREE_CODE (value);
3273 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3274 /* Used to test also that TYPE_SIZE (value) != 0.
3275 That caused warning for `struct foo;' at top level in the file. */
3277 register tree name = lookup_tag_reverse (value);
3284 if (warned != 1 && code != ENUMERAL_TYPE)
3285 /* Empty unnamed enum OK */
3287 pedwarn ("unnamed struct/union that defines no instances");
3293 t = lookup_tag (code, name, current_binding_level, 1);
3297 t = make_node (code);
3304 if (!warned && ! in_system_header)
3306 warning ("useless keyword or type name in empty declaration");
3313 error ("two types specified in one empty declaration");
3318 pedwarn ("empty declaration");
3322 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3325 groktypename (typename)
3328 if (TREE_CODE (typename) != TREE_LIST)
3330 return grokdeclarator (TREE_VALUE (typename),
3331 TREE_PURPOSE (typename),
3335 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3338 groktypename_in_parm_context (typename)
3341 if (TREE_CODE (typename) != TREE_LIST)
3343 return grokdeclarator (TREE_VALUE (typename),
3344 TREE_PURPOSE (typename),
3348 /* Decode a declarator in an ordinary declaration or data definition.
3349 This is called as soon as the type information and variable name
3350 have been parsed, before parsing the initializer if any.
3351 Here we create the ..._DECL node, fill in its type,
3352 and put it on the list of decls for the current context.
3353 The ..._DECL node is returned as the value.
3355 Exception: for arrays where the length is not specified,
3356 the type is left null, to be filled in by `finish_decl'.
3358 Function definitions do not come here; they go to start_function
3359 instead. However, external and forward declarations of functions
3360 do go through here. Structure field declarations are done by
3361 grokfield and not through here. */
3364 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3365 tree declarator, declspecs;
3367 tree attributes, prefix_attributes;
3369 register tree decl = grokdeclarator (declarator, declspecs,
3370 NORMAL, initialized);
3373 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3374 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3375 warning_with_decl (decl, "`%s' is usually a function");
3378 /* Is it valid for this decl to have an initializer at all?
3379 If not, set INITIALIZED to zero, which will indirectly
3380 tell `finish_decl' to ignore the initializer once it is parsed. */
3381 switch (TREE_CODE (decl))
3384 /* typedef foo = bar means give foo the same type as bar.
3385 We haven't parsed bar yet, so `finish_decl' will fix that up.
3386 Any other case of an initialization in a TYPE_DECL is an error. */
3387 if (pedantic || list_length (declspecs) > 1)
3389 error ("typedef `%s' is initialized",
3390 IDENTIFIER_POINTER (DECL_NAME (decl)));
3396 error ("function `%s' is initialized like a variable",
3397 IDENTIFIER_POINTER (DECL_NAME (decl)));
3402 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3403 error ("parameter `%s' is initialized",
3404 IDENTIFIER_POINTER (DECL_NAME (decl)));
3409 /* Don't allow initializations for incomplete types
3410 except for arrays which might be completed by the initialization. */
3411 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3413 /* A complete type is ok if size is fixed. */
3415 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3416 || C_DECL_VARIABLE_SIZE (decl))
3418 error ("variable-sized object may not be initialized");
3422 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3424 error ("variable `%s' has initializer but incomplete type",
3425 IDENTIFIER_POINTER (DECL_NAME (decl)));
3428 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3430 error ("elements of array `%s' have incomplete type",
3431 IDENTIFIER_POINTER (DECL_NAME (decl)));
3438 #if 0 /* Seems redundant with grokdeclarator. */
3439 if (current_binding_level != global_binding_level
3440 && DECL_EXTERNAL (decl)
3441 && TREE_CODE (decl) != FUNCTION_DECL)
3442 warning ("declaration of `%s' has `extern' and is initialized",
3443 IDENTIFIER_POINTER (DECL_NAME (decl)));
3445 DECL_EXTERNAL (decl) = 0;
3446 if (current_binding_level == global_binding_level)
3447 TREE_STATIC (decl) = 1;
3449 /* Tell `pushdecl' this is an initialized decl
3450 even though we don't yet have the initializer expression.
3451 Also tell `finish_decl' it may store the real initializer. */
3452 DECL_INITIAL (decl) = error_mark_node;
3455 /* If this is a function declaration, write a record describing it to the
3456 prototypes file (if requested). */
3458 if (TREE_CODE (decl) == FUNCTION_DECL)
3459 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3461 /* ANSI specifies that a tentative definition which is not merged with
3462 a non-tentative definition behaves exactly like a definition with an
3463 initializer equal to zero. (Section 3.7.2)
3464 -fno-common gives strict ANSI behavior. Usually you don't want it.
3465 This matters only for variables with external linkage. */
3466 if (! flag_no_common || ! TREE_PUBLIC (decl))
3467 DECL_COMMON (decl) = 1;
3469 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3470 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3473 /* Set attributes here so if duplicate decl, will have proper attributes. */
3474 decl_attributes (decl, attributes, prefix_attributes);
3476 /* Add this decl to the current binding level.
3477 TEM may equal DECL or it may be a previous decl of the same name. */
3478 tem = pushdecl (decl);
3480 /* For a local variable, define the RTL now. */
3481 if (current_binding_level != global_binding_level
3482 /* But not if this is a duplicate decl
3483 and we preserved the rtl from the previous one
3484 (which may or may not happen). */
3485 && DECL_RTL (tem) == 0)
3487 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3489 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3490 && DECL_INITIAL (tem) != 0)
3497 /* Finish processing of a declaration;
3498 install its initial value.
3499 If the length of an array type is not known before,
3500 it must be determined now, from the initial value, or it is an error. */
3503 finish_decl (decl, init, asmspec_tree)
3507 register tree type = TREE_TYPE (decl);
3508 int was_incomplete = (DECL_SIZE (decl) == 0);
3511 /* If a name was specified, get the string. */
3513 asmspec = TREE_STRING_POINTER (asmspec_tree);
3515 /* If `start_decl' didn't like having an initialization, ignore it now. */
3517 if (init != 0 && DECL_INITIAL (decl) == 0)
3519 /* Don't crash if parm is initialized. */
3520 if (TREE_CODE (decl) == PARM_DECL)
3523 if (ITERATOR_P (decl))
3526 error_with_decl (decl, "iterator has no initial value");
3528 init = save_expr (init);
3533 if (TREE_CODE (decl) != TYPE_DECL)
3534 store_init_value (decl, init);
3537 /* typedef foo = bar; store the type of bar as the type of foo. */
3538 TREE_TYPE (decl) = TREE_TYPE (init);
3539 DECL_INITIAL (decl) = init = 0;
3543 /* Deduce size of array from initialization, if not already known */
3545 if (TREE_CODE (type) == ARRAY_TYPE
3546 && TYPE_DOMAIN (type) == 0
3547 && TREE_CODE (decl) != TYPE_DECL)
3550 = (TREE_STATIC (decl)
3551 /* Even if pedantic, an external linkage array
3552 may have incomplete type at first. */
3553 ? pedantic && !TREE_PUBLIC (decl)
3554 : !DECL_EXTERNAL (decl));
3556 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3558 /* Get the completed type made by complete_array_type. */
3559 type = TREE_TYPE (decl);
3562 error_with_decl (decl, "initializer fails to determine size of `%s'");
3567 error_with_decl (decl, "array size missing in `%s'");
3568 /* If a `static' var's size isn't known,
3569 make it extern as well as static, so it does not get
3571 If it is not `static', then do not mark extern;
3572 finish_incomplete_decl will give it a default size
3573 and it will get allocated. */
3574 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3575 DECL_EXTERNAL (decl) = 1;
3578 /* TYPE_MAX_VALUE is always one less than the number of elements
3579 in the array, because we start counting at zero. Therefore,
3580 warn only if the value is less than zero. */
3581 if (pedantic && TYPE_DOMAIN (type) != 0
3582 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3583 error_with_decl (decl, "zero or negative size array `%s'");
3585 layout_decl (decl, 0);
3588 if (TREE_CODE (decl) == VAR_DECL)
3590 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3591 layout_decl (decl, 0);
3593 if (DECL_SIZE (decl) == 0
3594 && (TREE_STATIC (decl)
3596 /* A static variable with an incomplete type
3597 is an error if it is initialized.
3598 Also if it is not file scope.
3599 Otherwise, let it through, but if it is not `extern'
3600 then it may cause an error message later. */
3601 /* A duplicate_decls call could have changed an extern
3602 declaration into a file scope one. This can be detected
3603 by TREE_ASM_WRITTEN being set. */
3604 (DECL_INITIAL (decl) != 0
3605 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3607 /* An automatic variable with an incomplete type
3609 !DECL_EXTERNAL (decl)))
3611 error_with_decl (decl, "storage size of `%s' isn't known");
3612 TREE_TYPE (decl) = error_mark_node;
3615 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3616 && DECL_SIZE (decl) != 0)
3618 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3619 constant_expression_warning (DECL_SIZE (decl));
3621 error_with_decl (decl, "storage size of `%s' isn't constant");
3624 if (TREE_USED (type))
3625 TREE_USED (decl) = 1;
3628 /* If this is a function and an assembler name is specified, it isn't
3629 builtin any more. Also reset DECL_RTL so we can give it its new
3631 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3633 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3634 DECL_RTL (decl) = 0;
3635 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3638 /* Output the assembler code and/or RTL code for variables and functions,
3639 unless the type is an undefined structure or union.
3640 If not, it will get done when the type is completed. */
3642 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3644 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3645 maybe_objc_check_decl (decl);
3646 rest_of_decl_compilation (decl, asmspec,
3647 (DECL_CONTEXT (decl) == 0
3648 || TREE_ASM_WRITTEN (decl)), 0);
3650 if (DECL_CONTEXT (decl) != 0)
3652 /* Recompute the RTL of a local array now
3653 if it used to be an incomplete type. */
3655 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3657 /* If we used it already as memory, it must stay in memory. */
3658 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3659 /* If it's still incomplete now, no init will save it. */
3660 if (DECL_SIZE (decl) == 0)
3661 DECL_INITIAL (decl) = 0;
3664 /* Compute and store the initial value. */
3665 if (TREE_CODE (decl) != FUNCTION_DECL)
3666 expand_decl_init (decl);
3670 if (TREE_CODE (decl) == TYPE_DECL)
3672 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3673 maybe_objc_check_decl (decl);
3674 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3677 /* At the end of a declaration, throw away any variable type sizes
3678 of types defined inside that declaration. There is no use
3679 computing them in the following function definition. */
3680 if (current_binding_level == global_binding_level)
3681 get_pending_sizes ();
3684 /* If DECL has a cleanup, build and return that cleanup here.
3685 This is a callback called by expand_expr. */
3688 maybe_build_cleanup (decl)
3689 tree decl ATTRIBUTE_UNUSED;
3691 /* There are no cleanups in C. */
3695 /* Given a parsed parameter declaration,
3696 decode it into a PARM_DECL and push that on the current binding level.
3697 Also, for the sake of forward parm decls,
3698 record the given order of parms in `parm_order'. */
3701 push_parm_decl (parm)
3705 int old_immediate_size_expand = immediate_size_expand;
3706 /* Don't try computing parm sizes now -- wait till fn is called. */
3707 immediate_size_expand = 0;
3709 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3710 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3711 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3712 TREE_PURPOSE (TREE_VALUE (parm)));
3715 if (DECL_NAME (decl))
3718 olddecl = lookup_name (DECL_NAME (decl));
3719 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3720 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3724 decl = pushdecl (decl);
3726 immediate_size_expand = old_immediate_size_expand;
3728 current_binding_level->parm_order
3729 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3731 /* Add this decl to the current binding level. */
3732 finish_decl (decl, NULL_TREE, NULL_TREE);
3735 /* Clear the given order of parms in `parm_order'.
3736 Used at start of parm list,
3737 and also at semicolon terminating forward decls. */
3742 current_binding_level->parm_order = NULL_TREE;
3745 /* Make TYPE a complete type based on INITIAL_VALUE.
3746 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3747 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3750 complete_array_type (type, initial_value, do_default)
3755 register tree maxindex = NULL_TREE;
3760 /* Note MAXINDEX is really the maximum index,
3761 one less than the size. */
3762 if (TREE_CODE (initial_value) == STRING_CST)
3765 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3766 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3769 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3771 tree elts = CONSTRUCTOR_ELTS (initial_value);
3772 maxindex = build_int_2 (-1, -1);
3773 for (; elts; elts = TREE_CHAIN (elts))
3775 if (TREE_PURPOSE (elts))
3776 maxindex = TREE_PURPOSE (elts);
3778 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3779 maxindex, integer_one_node));
3781 maxindex = copy_node (maxindex);
3785 /* Make an error message unless that happened already. */
3786 if (initial_value != error_mark_node)
3789 /* Prevent further error messages. */
3790 maxindex = build_int_2 (0, 0);
3797 maxindex = build_int_2 (0, 0);
3803 TYPE_DOMAIN (type) = build_index_type (maxindex);
3804 if (!TREE_TYPE (maxindex))
3805 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3808 /* Lay out the type now that we can get the real answer. */
3815 /* Given declspecs and a declarator,
3816 determine the name and type of the object declared
3817 and construct a ..._DECL node for it.
3818 (In one case we can return a ..._TYPE node instead.
3819 For invalid input we sometimes return 0.)
3821 DECLSPECS is a chain of tree_list nodes whose value fields
3822 are the storage classes and type specifiers.
3824 DECL_CONTEXT says which syntactic context this declaration is in:
3825 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3826 FUNCDEF for a function definition. Like NORMAL but a few different
3827 error messages in each case. Return value may be zero meaning
3828 this definition is too screwy to try to parse.
3829 PARM for a parameter declaration (either within a function prototype
3830 or before a function body). Make a PARM_DECL, or return void_type_node.
3831 TYPENAME if for a typename (in a cast or sizeof).
3832 Don't make a DECL node; just return the ..._TYPE node.
3833 FIELD for a struct or union field; make a FIELD_DECL.
3834 BITFIELD for a field with specified width.
3835 INITIALIZED is 1 if the decl has an initializer.
3837 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3838 It may also be so in the PARM case, for a prototype where the
3839 argument type is specified but not the name.
3841 This function is where the complicated C meanings of `static'
3842 and `extern' are interpreted. */
3845 grokdeclarator (declarator, declspecs, decl_context, initialized)
3848 enum decl_context decl_context;
3853 tree type = NULL_TREE;
3858 int type_quals = TYPE_UNQUALIFIED;
3860 int explicit_int = 0;
3861 int explicit_char = 0;
3862 int defaulted_int = 0;
3863 tree typedef_decl = 0;
3865 tree typedef_type = 0;
3866 int funcdef_flag = 0;
3867 enum tree_code innermost_code = ERROR_MARK;
3869 int size_varies = 0;
3870 tree decl_machine_attr = NULL_TREE;
3872 if (decl_context == BITFIELD)
3873 bitfield = 1, decl_context = FIELD;
3875 if (decl_context == FUNCDEF)
3876 funcdef_flag = 1, decl_context = NORMAL;
3878 /* Look inside a declarator for the name being declared
3879 and get it as a string, for an error message. */
3881 register tree decl = declarator;
3885 switch (TREE_CODE (decl))
3890 innermost_code = TREE_CODE (decl);
3891 decl = TREE_OPERAND (decl, 0);
3894 case IDENTIFIER_NODE:
3895 name = IDENTIFIER_POINTER (decl);
3906 /* A function definition's declarator must have the form of
3907 a function declarator. */
3909 if (funcdef_flag && innermost_code != CALL_EXPR)
3912 /* Anything declared one level down from the top level
3913 must be one of the parameters of a function
3914 (because the body is at least two levels down). */
3916 /* If this looks like a function definition, make it one,
3917 even if it occurs where parms are expected.
3918 Then store_parm_decls will reject it and not use it as a parm. */
3919 if (decl_context == NORMAL && !funcdef_flag
3920 && current_binding_level->parm_flag)
3921 decl_context = PARM;
3923 /* Look through the decl specs and record which ones appear.
3924 Some typespecs are defined as built-in typenames.
3925 Others, the ones that are modifiers of other types,
3926 are represented by bits in SPECBITS: set the bits for
3927 the modifiers that appear. Storage class keywords are also in SPECBITS.
3929 If there is a typedef name or a type, store the type in TYPE.
3930 This includes builtin typedefs such as `int'.
3932 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3933 and did not come from a user typedef.
3935 Set LONGLONG if `long' is mentioned twice. */
3937 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3940 register tree id = TREE_VALUE (spec);
3942 if (id == ridpointers[(int) RID_INT])
3944 if (id == ridpointers[(int) RID_CHAR])
3947 if (TREE_CODE (id) == IDENTIFIER_NODE)
3948 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3950 if (ridpointers[i] == id)
3952 if (i == (int) RID_LONG && specbits & (1<<i))
3955 error ("`long long long' is too long for GCC");
3958 if (pedantic && !flag_isoc99 && ! in_system_header
3960 pedwarn ("ANSI C does not support `long long'");
3964 else if (specbits & (1 << i))
3965 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3971 error ("two or more data types in declaration of `%s'", name);
3972 /* Actual typedefs come to us as TYPE_DECL nodes. */
3973 else if (TREE_CODE (id) == TYPE_DECL)
3975 type = TREE_TYPE (id);
3976 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3979 /* Built-in types come as identifiers. */
3980 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3982 register tree t = lookup_name (id);
3983 if (TREE_TYPE (t) == error_mark_node)
3985 else if (!t || TREE_CODE (t) != TYPE_DECL)
3986 error ("`%s' fails to be a typedef or built in type",
3987 IDENTIFIER_POINTER (id));
3990 type = TREE_TYPE (t);
3994 else if (TREE_CODE (id) != ERROR_MARK)
4000 typedef_type = type;
4002 size_varies = C_TYPE_VARIABLE_SIZE (type);
4004 /* No type at all: default to `int', and set DEFAULTED_INT
4005 because it was not a user-defined typedef. */
4009 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4010 | (1 << (int) RID_SIGNED)
4011 | (1 << (int) RID_UNSIGNED))))
4012 /* Don't warn about typedef foo = bar. */
4013 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4014 && ! in_system_header)
4016 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4017 and this is a function, or if -Wimplicit; prefer the former
4018 warning since it is more explicit. */
4019 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4020 warn_about_return_type = 1;
4021 else if (warn_implicit_int || flag_isoc99)
4022 pedwarn_c99 ("type defaults to `int' in declaration of `%s'", name);
4026 type = integer_type_node;
4029 /* Now process the modifiers that were specified
4030 and check for invalid combinations. */
4032 /* Long double is a special combination. */
4034 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4035 && TYPE_MAIN_VARIANT (type) == double_type_node)
4037 specbits &= ~ (1 << (int) RID_LONG);
4038 type = long_double_type_node;
4041 /* Check all other uses of type modifiers. */
4043 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4044 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4048 if ((specbits & 1 << (int) RID_LONG)
4049 && (specbits & 1 << (int) RID_SHORT))
4050 error ("both long and short specified for `%s'", name);
4051 else if (((specbits & 1 << (int) RID_LONG)
4052 || (specbits & 1 << (int) RID_SHORT))
4054 error ("long or short specified with char for `%s'", name);
4055 else if (((specbits & 1 << (int) RID_LONG)
4056 || (specbits & 1 << (int) RID_SHORT))
4057 && TREE_CODE (type) == REAL_TYPE)
4059 static int already = 0;
4061 error ("long or short specified with floating type for `%s'", name);
4062 if (! already && ! pedantic)
4064 error ("the only valid combination is `long double'");
4068 else if ((specbits & 1 << (int) RID_SIGNED)
4069 && (specbits & 1 << (int) RID_UNSIGNED))
4070 error ("both signed and unsigned specified for `%s'", name);
4071 else if (TREE_CODE (type) != INTEGER_TYPE)
4072 error ("long, short, signed or unsigned invalid for `%s'", name);
4076 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4078 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4080 if (flag_pedantic_errors)
4085 /* Discard the type modifiers if they are invalid. */
4088 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4089 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4094 if ((specbits & (1 << (int) RID_COMPLEX))
4095 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4097 error ("complex invalid for `%s'", name);
4098 specbits &= ~ (1 << (int) RID_COMPLEX);
4101 /* Decide whether an integer type is signed or not.
4102 Optionally treat bitfields as signed by default. */
4103 if (specbits & 1 << (int) RID_UNSIGNED
4104 /* Traditionally, all bitfields are unsigned. */
4105 || (bitfield && flag_traditional
4106 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4107 || (bitfield && ! flag_signed_bitfields
4108 && (explicit_int || defaulted_int || explicit_char
4109 /* A typedef for plain `int' without `signed'
4110 can be controlled just like plain `int'. */
4111 || ! (typedef_decl != 0
4112 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4113 && TREE_CODE (type) != ENUMERAL_TYPE
4114 && !(specbits & 1 << (int) RID_SIGNED)))
4117 type = long_long_unsigned_type_node;
4118 else if (specbits & 1 << (int) RID_LONG)
4119 type = long_unsigned_type_node;
4120 else if (specbits & 1 << (int) RID_SHORT)
4121 type = short_unsigned_type_node;
4122 else if (type == char_type_node)
4123 type = unsigned_char_type_node;
4124 else if (typedef_decl)
4125 type = unsigned_type (type);
4127 type = unsigned_type_node;
4129 else if ((specbits & 1 << (int) RID_SIGNED)
4130 && type == char_type_node)
4131 type = signed_char_type_node;
4133 type = long_long_integer_type_node;
4134 else if (specbits & 1 << (int) RID_LONG)
4135 type = long_integer_type_node;
4136 else if (specbits & 1 << (int) RID_SHORT)
4137 type = short_integer_type_node;
4139 if (specbits & 1 << (int) RID_COMPLEX)
4141 /* If we just have "complex", it is equivalent to
4142 "complex double", but if any modifiers at all are specified it is
4143 the complex form of TYPE. E.g, "complex short" is
4144 "complex short int". */
4146 if (defaulted_int && ! longlong
4147 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4148 | (1 << (int) RID_SIGNED)
4149 | (1 << (int) RID_UNSIGNED))))
4150 type = complex_double_type_node;
4151 else if (type == integer_type_node)
4152 type = complex_integer_type_node;
4153 else if (type == float_type_node)
4154 type = complex_float_type_node;
4155 else if (type == double_type_node)
4156 type = complex_double_type_node;
4157 else if (type == long_double_type_node)
4158 type = complex_long_double_type_node;
4160 type = build_complex_type (type);
4163 /* Figure out the type qualifiers for the declaration. There are
4164 two ways a declaration can become qualified. One is something
4165 like `const int i' where the `const' is explicit. Another is
4166 something like `typedef const int CI; CI i' where the type of the
4167 declaration contains the `const'. */
4168 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4169 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4170 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4171 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4172 if (constp > 1 && ! flag_isoc99)
4173 pedwarn ("duplicate `const'");
4174 if (restrictp > 1 && ! flag_isoc99)
4175 pedwarn ("duplicate `restrict'");
4176 if (volatilep > 1 && ! flag_isoc99)
4177 pedwarn ("duplicate `volatile'");
4178 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4179 type = TYPE_MAIN_VARIANT (type);
4180 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4181 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4182 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4184 /* Warn if two storage classes are given. Default to `auto'. */
4189 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4190 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4191 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4192 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4193 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4194 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4196 /* Warn about storage classes that are invalid for certain
4197 kinds of declarations (parameters, typenames, etc.). */
4200 error ("multiple storage classes in declaration of `%s'", name);
4201 else if (funcdef_flag
4203 & ((1 << (int) RID_REGISTER)
4204 | (1 << (int) RID_AUTO)
4205 | (1 << (int) RID_TYPEDEF))))
4207 if (specbits & 1 << (int) RID_AUTO
4208 && (pedantic || current_binding_level == global_binding_level))
4209 pedwarn ("function definition declared `auto'");
4210 if (specbits & 1 << (int) RID_REGISTER)
4211 error ("function definition declared `register'");
4212 if (specbits & 1 << (int) RID_TYPEDEF)
4213 error ("function definition declared `typedef'");
4214 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4215 | (1 << (int) RID_AUTO));
4217 else if (decl_context != NORMAL && nclasses > 0)
4219 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4223 switch (decl_context)
4226 error ("storage class specified for structure field `%s'", name);
4229 error ("storage class specified for parameter `%s'", name);
4232 error ("storage class specified for typename");
4235 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4236 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4237 | (1 << (int) RID_EXTERN));
4240 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4242 /* `extern' with initialization is invalid if not at top level. */
4243 if (current_binding_level == global_binding_level)
4244 warning ("`%s' initialized and declared `extern'", name);
4246 error ("`%s' has both `extern' and initializer", name);
4248 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4249 && current_binding_level != global_binding_level)
4250 error ("nested function `%s' declared `extern'", name);
4251 else if (current_binding_level == global_binding_level
4252 && specbits & (1 << (int) RID_AUTO))
4253 error ("top-level declaration of `%s' specifies `auto'", name);
4254 else if ((specbits & 1 << (int) RID_ITERATOR)
4255 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4257 error ("iterator `%s' has derived type", name);
4258 type = error_mark_node;
4260 else if ((specbits & 1 << (int) RID_ITERATOR)
4261 && TREE_CODE (type) != INTEGER_TYPE)
4263 error ("iterator `%s' has noninteger type", name);
4264 type = error_mark_node;
4268 /* Now figure out the structure of the declarator proper.
4269 Descend through it, creating more complex types, until we reach
4270 the declared identifier (or NULL_TREE, in an absolute declarator). */
4272 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4274 if (type == error_mark_node)
4276 declarator = TREE_OPERAND (declarator, 0);
4280 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4281 an INDIRECT_REF (for *...),
4282 a CALL_EXPR (for ...(...)),
4283 an identifier (for the name being declared)
4284 or a null pointer (for the place in an absolute declarator
4285 where the name was omitted).
4286 For the last two cases, we have just exited the loop.
4288 At this point, TYPE is the type of elements of an array,
4289 or for a function to return, or for a pointer to point to.
4290 After this sequence of ifs, TYPE is the type of the
4291 array or function or pointer, and DECLARATOR has had its
4292 outermost layer removed. */
4294 if (TREE_CODE (declarator) == ARRAY_REF)
4296 register tree itype = NULL_TREE;
4297 register tree size = TREE_OPERAND (declarator, 1);
4298 /* The index is a signed object `sizetype' bits wide. */
4299 tree index_type = signed_type (sizetype);
4301 declarator = TREE_OPERAND (declarator, 0);
4303 /* Check for some types that there cannot be arrays of. */
4305 if (VOID_TYPE_P (type))
4307 error ("declaration of `%s' as array of voids", name);
4308 type = error_mark_node;
4311 if (TREE_CODE (type) == FUNCTION_TYPE)
4313 error ("declaration of `%s' as array of functions", name);
4314 type = error_mark_node;
4317 if (size == error_mark_node)
4318 type = error_mark_node;
4320 if (type == error_mark_node)
4323 /* If size was specified, set ITYPE to a range-type for that size.
4324 Otherwise, ITYPE remains null. finish_decl may figure it out
4325 from an initial value. */
4329 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4330 STRIP_TYPE_NOPS (size);
4332 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4333 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4335 error ("size of array `%s' has non-integer type", name);
4336 size = integer_one_node;
4339 if (pedantic && integer_zerop (size))
4340 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4342 if (TREE_CODE (size) == INTEGER_CST)
4344 constant_expression_warning (size);
4345 if (tree_int_cst_sgn (size) < 0)
4347 error ("size of array `%s' is negative", name);
4348 size = integer_one_node;
4353 /* Make sure the array size remains visibly nonconstant
4354 even if it is (eg) a const variable with known value. */
4359 if (TREE_CONSTANT (size))
4360 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4362 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4366 /* Convert size to index_type, so that if it is a variable
4367 the computations will be done in the proper mode. */
4368 itype = fold (build (MINUS_EXPR, index_type,
4369 convert (index_type, size),
4370 convert (index_type, size_one_node)));
4372 /* If that overflowed, the array is too big.
4373 ??? While a size of INT_MAX+1 technically shouldn't cause
4374 an overflow (because we subtract 1), the overflow is recorded
4375 during the conversion to index_type, before the subtraction.
4376 Handling this case seems like an unnecessary complication. */
4377 if (TREE_OVERFLOW (itype))
4379 error ("size of array `%s' is too large", name);
4380 type = error_mark_node;
4385 itype = variable_size (itype);
4386 itype = build_index_type (itype);
4389 #if 0 /* This had bad results for pointers to arrays, as in
4390 union incomplete (*foo)[4]; */
4391 /* Complain about arrays of incomplete types, except in typedefs. */
4393 if (!COMPLETE_TYPE_P (type)
4394 /* Avoid multiple warnings for nested array types. */
4395 && TREE_CODE (type) != ARRAY_TYPE
4396 && !(specbits & (1 << (int) RID_TYPEDEF))
4397 && !C_TYPE_BEING_DEFINED (type))
4398 warning ("array type has incomplete element type");
4401 #if 0 /* We shouldn't have a function type here at all!
4402 Functions aren't allowed as array elements. */
4403 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4404 && (constp || volatilep))
4405 pedwarn ("ANSI C forbids const or volatile function types");
4408 /* Build the array type itself, then merge any constancy or
4409 volatility into the target type. We must do it in this order
4410 to ensure that the TYPE_MAIN_VARIANT field of the array type
4411 is set correctly. */
4413 type = build_array_type (type, itype);
4415 type = c_build_qualified_type (type, type_quals);
4417 #if 0 /* don't clear these; leave them set so that the array type
4418 or the variable is itself const or volatile. */
4419 type_quals = TYPE_UNQUALIFIED;
4423 C_TYPE_VARIABLE_SIZE (type) = 1;
4425 else if (TREE_CODE (declarator) == CALL_EXPR)
4429 /* Declaring a function type.
4430 Make sure we have a valid type for the function to return. */
4431 if (type == error_mark_node)
4436 /* Warn about some types functions can't return. */
4438 if (TREE_CODE (type) == FUNCTION_TYPE)
4440 error ("`%s' declared as function returning a function", name);
4441 type = integer_type_node;
4443 if (TREE_CODE (type) == ARRAY_TYPE)
4445 error ("`%s' declared as function returning an array", name);
4446 type = integer_type_node;
4449 #ifndef TRADITIONAL_RETURN_FLOAT
4450 /* Traditionally, declaring return type float means double. */
4452 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4453 type = double_type_node;
4454 #endif /* TRADITIONAL_RETURN_FLOAT */
4456 /* Construct the function type and go to the next
4457 inner layer of declarator. */
4459 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4461 /* Say it's a definition
4462 only for the CALL_EXPR
4463 closest to the identifier. */
4464 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4465 /* Type qualifiers before the return type of the function
4466 qualify the return type, not the function type. */
4468 type = c_build_qualified_type (type, type_quals);
4469 type_quals = TYPE_UNQUALIFIED;
4471 type = build_function_type (type, arg_types);
4472 declarator = TREE_OPERAND (declarator, 0);
4474 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4475 the formal parameter list of this FUNCTION_TYPE to point to
4476 the FUNCTION_TYPE node itself. */
4481 for (link = last_function_parm_tags;
4483 link = TREE_CHAIN (link))
4484 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4487 else if (TREE_CODE (declarator) == INDIRECT_REF)
4489 /* Merge any constancy or volatility into the target type
4492 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4494 pedwarn ("ANSI C forbids qualified function types");
4496 type = c_build_qualified_type (type, type_quals);
4497 type_quals = TYPE_UNQUALIFIED;
4500 type = build_pointer_type (type);
4502 /* Process a list of type modifier keywords
4503 (such as const or volatile) that were given inside the `*'. */
4505 if (TREE_TYPE (declarator))
4507 register tree typemodlist;
4513 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4514 typemodlist = TREE_CHAIN (typemodlist))
4516 tree qualifier = TREE_VALUE (typemodlist);
4518 if (qualifier == ridpointers[(int) RID_CONST])
4520 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4522 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4527 error ("invalid type modifier within pointer declarator");
4530 if (constp > 1 && ! flag_isoc99)
4531 pedwarn ("duplicate `const'");
4532 if (volatilep > 1 && ! flag_isoc99)
4533 pedwarn ("duplicate `volatile'");
4534 if (restrictp > 1 && ! flag_isoc99)
4535 pedwarn ("duplicate `restrict'");
4537 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4538 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4539 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4542 declarator = TREE_OPERAND (declarator, 0);
4549 /* Now TYPE has the actual type. */
4551 /* Did array size calculations overflow? */
4553 if (TREE_CODE (type) == ARRAY_TYPE
4554 && COMPLETE_TYPE_P (type)
4555 && TREE_OVERFLOW (TYPE_SIZE (type)))
4556 error ("size of array `%s' is too large", name);
4558 /* If this is declaring a typedef name, return a TYPE_DECL. */
4560 if (specbits & (1 << (int) RID_TYPEDEF))
4563 /* Note that the grammar rejects storage classes
4564 in typenames, fields or parameters */
4565 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4567 pedwarn ("ANSI C forbids qualified function types");
4569 type = c_build_qualified_type (type, type_quals);
4570 decl = build_decl (TYPE_DECL, declarator, type);
4571 if ((specbits & (1 << (int) RID_SIGNED))
4572 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4573 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4577 /* Detect the case of an array type of unspecified size
4578 which came, as such, direct from a typedef name.
4579 We must copy the type, so that each identifier gets
4580 a distinct type, so that each identifier's size can be
4581 controlled separately by its own initializer. */
4583 if (type != 0 && typedef_type != 0
4584 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4585 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4587 type = build_array_type (TREE_TYPE (type), 0);
4589 C_TYPE_VARIABLE_SIZE (type) = 1;
4592 /* If this is a type name (such as, in a cast or sizeof),
4593 compute the type and return it now. */
4595 if (decl_context == TYPENAME)
4597 /* Note that the grammar rejects storage classes
4598 in typenames, fields or parameters */
4599 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4601 pedwarn ("ANSI C forbids const or volatile function types");
4603 type = c_build_qualified_type (type, type_quals);
4607 /* Aside from typedefs and type names (handle above),
4608 `void' at top level (not within pointer)
4609 is allowed only in public variables.
4610 We don't complain about parms either, but that is because
4611 a better error message can be made later. */
4613 if (VOID_TYPE_P (type) && decl_context != PARM
4614 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4615 && ((specbits & (1 << (int) RID_EXTERN))
4616 || (current_binding_level == global_binding_level
4618 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4620 error ("variable or field `%s' declared void", name);
4621 type = integer_type_node;
4624 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4625 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4630 if (decl_context == PARM)
4632 tree type_as_written = type;
4635 /* A parameter declared as an array of T is really a pointer to T.
4636 One declared as a function is really a pointer to a function. */
4638 if (TREE_CODE (type) == ARRAY_TYPE)
4640 /* Transfer const-ness of array into that of type pointed to. */
4641 type = TREE_TYPE (type);
4643 type = c_build_qualified_type (type, type_quals);
4644 type = build_pointer_type (type);
4645 type_quals = TYPE_UNQUALIFIED;
4648 else if (TREE_CODE (type) == FUNCTION_TYPE)
4650 if (pedantic && type_quals)
4651 pedwarn ("ANSI C forbids qualified function types");
4653 type = c_build_qualified_type (type, type_quals);
4654 type = build_pointer_type (type);
4655 type_quals = TYPE_UNQUALIFIED;
4658 decl = build_decl (PARM_DECL, declarator, type);
4660 C_DECL_VARIABLE_SIZE (decl) = 1;
4662 /* Compute the type actually passed in the parmlist,
4663 for the case where there is no prototype.
4664 (For example, shorts and chars are passed as ints.)
4665 When there is a prototype, this is overridden later. */
4667 if (type == error_mark_node)
4668 promoted_type = type;
4671 promoted_type = simple_type_promotes_to (type);
4672 if (! promoted_type)
4673 promoted_type = type;
4676 DECL_ARG_TYPE (decl) = promoted_type;
4677 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4679 else if (decl_context == FIELD)
4681 /* Structure field. It may not be a function. */
4683 if (TREE_CODE (type) == FUNCTION_TYPE)
4685 error ("field `%s' declared as a function", name);
4686 type = build_pointer_type (type);
4688 else if (TREE_CODE (type) != ERROR_MARK
4689 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4691 error ("field `%s' has incomplete type", name);
4692 type = error_mark_node;
4694 /* Move type qualifiers down to element of an array. */
4695 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4697 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4699 TYPE_DOMAIN (type));
4700 #if 0 /* Leave the field const or volatile as well. */
4701 type_quals = TYPE_UNQUALIFIED;
4704 decl = build_decl (FIELD_DECL, declarator, type);
4705 DECL_NONADDRESSABLE_P (decl) = bitfield;
4708 C_DECL_VARIABLE_SIZE (decl) = 1;
4710 else if (TREE_CODE (type) == FUNCTION_TYPE)
4712 /* Every function declaration is "external"
4713 except for those which are inside a function body
4714 in which `auto' is used.
4715 That is a case not specified by ANSI C,
4716 and we use it for forward declarations for nested functions. */
4717 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4718 || current_binding_level == global_binding_level);
4720 if (specbits & (1 << (int) RID_AUTO)
4721 && (pedantic || current_binding_level == global_binding_level))
4722 pedwarn ("invalid storage class for function `%s'", name);
4723 if (specbits & (1 << (int) RID_REGISTER))
4724 error ("invalid storage class for function `%s'", name);
4725 /* Function declaration not at top level.
4726 Storage classes other than `extern' are not allowed
4727 and `extern' makes no difference. */
4728 if (current_binding_level != global_binding_level
4729 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4731 pedwarn ("invalid storage class for function `%s'", name);
4733 decl = build_decl (FUNCTION_DECL, declarator, type);
4734 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4736 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4737 pedwarn ("ANSI C forbids qualified function types");
4740 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4741 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4742 && ! DECL_IN_SYSTEM_HEADER (decl))
4743 pedwarn ("ANSI C forbids qualified void function return type");
4745 /* GNU C interprets a `volatile void' return type to indicate
4746 that the function does not return. */
4747 if ((type_quals & TYPE_QUAL_VOLATILE)
4748 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4749 warning ("`noreturn' function returns non-void value");
4752 DECL_EXTERNAL (decl) = 1;
4753 /* Record absence of global scope for `static' or `auto'. */
4755 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4757 /* Record presence of `inline', if it is reasonable. */
4760 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4761 warning ("cannot inline function `main'");
4763 /* Assume that otherwise the function can be inlined. */
4764 DECL_INLINE (decl) = 1;
4766 if (specbits & (1 << (int) RID_EXTERN))
4767 current_extern_inline = 1;
4772 /* It's a variable. */
4773 /* An uninitialized decl with `extern' is a reference. */
4774 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4776 /* Move type qualifiers down to element of an array. */
4777 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4779 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4781 TYPE_DOMAIN (type));
4782 #if 0 /* Leave the variable const or volatile as well. */
4783 type_quals = TYPE_UNQUALIFIED;
4787 decl = build_decl (VAR_DECL, declarator, type);
4789 C_DECL_VARIABLE_SIZE (decl) = 1;
4792 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4794 DECL_EXTERNAL (decl) = extern_ref;
4795 /* At top level, the presence of a `static' or `register' storage
4796 class specifier, or the absence of all storage class specifiers
4797 makes this declaration a definition (perhaps tentative). Also,
4798 the absence of both `static' and `register' makes it public. */
4799 if (current_binding_level == global_binding_level)
4803 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4804 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4806 /* Not at top level, only `static' makes a static definition. */
4809 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4810 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4813 if (specbits & 1 << (int) RID_ITERATOR)
4814 ITERATOR_P (decl) = 1;
4817 /* Record `register' declaration for warnings on &
4818 and in case doing stupid register allocation. */
4820 if (specbits & (1 << (int) RID_REGISTER))
4821 DECL_REGISTER (decl) = 1;
4823 /* Record constancy and volatility. */
4824 c_apply_type_quals_to_decl (type_quals, decl);
4826 /* If a type has volatile components, it should be stored in memory.
4827 Otherwise, the fact that those components are volatile
4828 will be ignored, and would even crash the compiler. */
4829 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4830 mark_addressable (decl);
4836 /* Decode the parameter-list info for a function type or function definition.
4837 The argument is the value returned by `get_parm_info' (or made in parse.y
4838 if there is an identifier list instead of a parameter decl list).
4839 These two functions are separate because when a function returns
4840 or receives functions then each is called multiple times but the order
4841 of calls is different. The last call to `grokparms' is always the one
4842 that contains the formal parameter names of a function definition.
4844 Store in `last_function_parms' a chain of the decls of parms.
4845 Also store in `last_function_parm_tags' a chain of the struct, union,
4846 and enum tags declared among the parms.
4848 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4850 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4851 a mere declaration. A nonempty identifier-list gets an error message
4852 when FUNCDEF_FLAG is zero. */
4855 grokparms (parms_info, funcdef_flag)
4859 tree first_parm = TREE_CHAIN (parms_info);
4861 last_function_parms = TREE_PURPOSE (parms_info);
4862 last_function_parm_tags = TREE_VALUE (parms_info);
4864 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4865 && !in_system_header)
4866 warning ("function declaration isn't a prototype");
4869 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4872 pedwarn ("parameter names (without types) in function declaration");
4874 last_function_parms = first_parm;
4881 /* We no longer test FUNCDEF_FLAG.
4882 If the arg types are incomplete in a declaration,
4883 they must include undefined tags.
4884 These tags can never be defined in the scope of the declaration,
4885 so the types can never be completed,
4886 and no call can be compiled successfully. */
4888 /* In a fcn definition, arg types must be complete. */
4891 for (parm = last_function_parms, typelt = first_parm;
4893 parm = TREE_CHAIN (parm))
4894 /* Skip over any enumeration constants declared here. */
4895 if (TREE_CODE (parm) == PARM_DECL)
4897 /* Barf if the parameter itself has an incomplete type. */
4898 tree type = TREE_VALUE (typelt);
4899 if (!COMPLETE_TYPE_P (type))
4901 if (funcdef_flag && DECL_NAME (parm) != 0)
4902 error ("parameter `%s' has incomplete type",
4903 IDENTIFIER_POINTER (DECL_NAME (parm)));
4905 warning ("parameter has incomplete type");
4908 TREE_VALUE (typelt) = error_mark_node;
4909 TREE_TYPE (parm) = error_mark_node;
4912 #if 0 /* This has been replaced by parm_tags_warning
4913 which uses a more accurate criterion for what to warn about. */
4916 /* Now warn if is a pointer to an incomplete type. */
4917 while (TREE_CODE (type) == POINTER_TYPE
4918 || TREE_CODE (type) == REFERENCE_TYPE)
4919 type = TREE_TYPE (type);
4920 type = TYPE_MAIN_VARIANT (type);
4921 if (!COMPLETE_TYPE_P (type))
4923 if (DECL_NAME (parm) != 0)
4924 warning ("parameter `%s' points to incomplete type",
4925 IDENTIFIER_POINTER (DECL_NAME (parm)));
4927 warning ("parameter points to incomplete type");
4931 typelt = TREE_CHAIN (typelt);
4939 /* Return a tree_list node with info on a parameter list just parsed.
4940 The TREE_PURPOSE is a chain of decls of those parms.
4941 The TREE_VALUE is a list of structure, union and enum tags defined.
4942 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4943 This tree_list node is later fed to `grokparms'.
4945 VOID_AT_END nonzero means append `void' to the end of the type-list.
4946 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4949 get_parm_info (void_at_end)
4952 register tree decl, t;
4953 register tree types = 0;
4955 tree tags = gettags ();
4956 tree parms = getdecls ();
4958 tree order = current_binding_level->parm_order;
4960 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4961 if (void_at_end && parms != 0
4962 && TREE_CHAIN (parms) == 0
4963 && VOID_TYPE_P (TREE_TYPE (parms))
4964 && DECL_NAME (parms) == 0)
4967 storedecls (NULL_TREE);
4968 return tree_cons (NULL_TREE, NULL_TREE,
4969 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4972 /* Extract enumerator values and other non-parms declared with the parms.
4973 Likewise any forward parm decls that didn't have real parm decls. */
4974 for (decl = parms; decl; )
4976 tree next = TREE_CHAIN (decl);
4978 if (TREE_CODE (decl) != PARM_DECL)
4980 TREE_CHAIN (decl) = new_parms;
4983 else if (TREE_ASM_WRITTEN (decl))
4985 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4986 TREE_CHAIN (decl) = new_parms;
4992 /* Put the parm decls back in the order they were in in the parm list. */
4993 for (t = order; t; t = TREE_CHAIN (t))
4996 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4998 TREE_CHAIN (TREE_VALUE (t)) = 0;
5001 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5004 /* Store the parmlist in the binding level since the old one
5005 is no longer a valid list. (We have changed the chain pointers.) */
5006 storedecls (new_parms);
5008 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5009 /* There may also be declarations for enumerators if an enumeration
5010 type is declared among the parms. Ignore them here. */
5011 if (TREE_CODE (decl) == PARM_DECL)
5013 /* Since there is a prototype,
5014 args are passed in their declared types. */
5015 tree type = TREE_TYPE (decl);
5016 DECL_ARG_TYPE (decl) = type;
5017 if (PROMOTE_PROTOTYPES
5018 && (TREE_CODE (type) == INTEGER_TYPE
5019 || TREE_CODE (type) == ENUMERAL_TYPE)
5020 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5021 DECL_ARG_TYPE (decl) = integer_type_node;
5023 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5024 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5025 && DECL_NAME (decl) == 0)
5027 error ("`void' in parameter list must be the entire list");
5033 return tree_cons (new_parms, tags,
5034 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5036 return tree_cons (new_parms, tags, nreverse (types));
5039 /* At end of parameter list, warn about any struct, union or enum tags
5040 defined within. Do so because these types cannot ever become complete. */
5043 parmlist_tags_warning ()
5048 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5050 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5051 /* An anonymous union parm type is meaningful as a GNU extension.
5052 So don't warn for that. */
5053 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5055 if (TREE_PURPOSE (elt) != 0)
5056 warning ("`%s %s' declared inside parameter list",
5057 (code == RECORD_TYPE ? "struct"
5058 : code == UNION_TYPE ? "union"
5060 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5062 warning ("anonymous %s declared inside parameter list",
5063 (code == RECORD_TYPE ? "struct"
5064 : code == UNION_TYPE ? "union"
5069 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5075 /* Get the struct, enum or union (CODE says which) with tag NAME.
5076 Define the tag as a forward-reference if it is not defined. */
5079 xref_tag (code, name)
5080 enum tree_code code;
5083 /* If a cross reference is requested, look up the type
5084 already defined for this tag and return it. */
5086 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5087 /* Even if this is the wrong type of tag, return what we found.
5088 There will be an error message anyway, from pending_xref_error.
5089 If we create an empty xref just for an invalid use of the type,
5090 the main result is to create lots of superfluous error messages. */
5094 /* If no such tag is yet defined, create a forward-reference node
5095 and record it as the "definition".
5096 When a real declaration of this type is found,
5097 the forward-reference will be altered into a real type. */
5099 ref = make_node (code);
5100 if (code == ENUMERAL_TYPE)
5102 /* (In ANSI, Enums can be referred to only if already defined.) */
5104 pedwarn ("ANSI C forbids forward references to `enum' types");
5105 /* Give the type a default layout like unsigned int
5106 to avoid crashing if it does not get defined. */
5107 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5108 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5109 TYPE_USER_ALIGN (ref) = 0;
5110 TREE_UNSIGNED (ref) = 1;
5111 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5112 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5113 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5116 pushtag (name, ref);
5121 /* Make sure that the tag NAME is defined *in the current binding level*
5122 at least as a forward reference.
5123 CODE says which kind of tag NAME ought to be. */
5126 start_struct (code, name)
5127 enum tree_code code;
5130 /* If there is already a tag defined at this binding level
5131 (as a forward reference), just return it. */
5133 register tree ref = 0;
5136 ref = lookup_tag (code, name, current_binding_level, 1);
5137 if (ref && TREE_CODE (ref) == code)
5139 C_TYPE_BEING_DEFINED (ref) = 1;
5140 TYPE_PACKED (ref) = flag_pack_struct;
5141 if (TYPE_FIELDS (ref))
5142 error ("redefinition of `%s %s'",
5143 code == UNION_TYPE ? "union" : "struct",
5144 IDENTIFIER_POINTER (name));
5149 /* Otherwise create a forward-reference just so the tag is in scope. */
5151 ref = make_node (code);
5152 pushtag (name, ref);
5153 C_TYPE_BEING_DEFINED (ref) = 1;
5154 TYPE_PACKED (ref) = flag_pack_struct;
5158 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5159 of a structure component, returning a FIELD_DECL node.
5160 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5162 This is done during the parsing of the struct declaration.
5163 The FIELD_DECL nodes are chained together and the lot of them
5164 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5167 grokfield (filename, line, declarator, declspecs, width)
5168 const char *filename ATTRIBUTE_UNUSED;
5169 int line ATTRIBUTE_UNUSED;
5170 tree declarator, declspecs, width;
5174 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5176 finish_decl (value, NULL_TREE, NULL_TREE);
5177 DECL_INITIAL (value) = width;
5179 maybe_objc_check_decl (value);
5183 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5184 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5185 ATTRIBUTES are attributes to be applied to the structure. */
5188 finish_struct (t, fieldlist, attributes)
5194 int toplevel = global_binding_level == current_binding_level;
5196 /* If this type was previously laid out as a forward reference,
5197 make sure we lay it out again. */
5201 decl_attributes (t, attributes, NULL_TREE);
5203 /* Nameless union parm types are useful as GCC extension. */
5204 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5205 /* Otherwise, warn about any struct or union def. in parmlist. */
5206 if (in_parm_level_p ())
5209 pedwarn ("%s defined inside parms",
5210 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5211 else if (! flag_traditional)
5212 warning ("%s defined inside parms",
5213 TREE_CODE (t) == UNION_TYPE ? "union" : "structure");
5218 for (x = fieldlist; x; x = TREE_CHAIN (x))
5219 if (DECL_NAME (x) != 0)
5223 pedwarn ("%s has no %smembers",
5224 TREE_CODE (t) == UNION_TYPE ? "union" : "struct",
5225 fieldlist ? "named " : "");
5228 /* Install struct as DECL_CONTEXT of each field decl.
5229 Also process specified field sizes,m which is found in the DECL_INITIAL.
5230 Store 0 there, except for ": 0" fields (so we can find them
5231 and delete them, below). */
5233 for (x = fieldlist; x; x = TREE_CHAIN (x))
5235 DECL_CONTEXT (x) = t;
5236 DECL_PACKED (x) |= TYPE_PACKED (t);
5238 /* If any field is const, the structure type is pseudo-const. */
5239 if (TREE_READONLY (x))
5240 C_TYPE_FIELDS_READONLY (t) = 1;
5243 /* A field that is pseudo-const makes the structure likewise. */
5244 tree t1 = TREE_TYPE (x);
5245 while (TREE_CODE (t1) == ARRAY_TYPE)
5246 t1 = TREE_TYPE (t1);
5247 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5248 && C_TYPE_FIELDS_READONLY (t1))
5249 C_TYPE_FIELDS_READONLY (t) = 1;
5252 /* Any field that is volatile means variables of this type must be
5253 treated in some ways as volatile. */
5254 if (TREE_THIS_VOLATILE (x))
5255 C_TYPE_FIELDS_VOLATILE (t) = 1;
5257 /* Any field of nominal variable size implies structure is too. */
5258 if (C_DECL_VARIABLE_SIZE (x))
5259 C_TYPE_VARIABLE_SIZE (t) = 1;
5261 /* Detect invalid nested redefinition. */
5262 if (TREE_TYPE (x) == t)
5263 error ("nested redefinition of `%s'",
5264 IDENTIFIER_POINTER (TYPE_NAME (t)));
5266 /* Detect invalid bit-field size. */
5267 if (DECL_INITIAL (x))
5268 STRIP_NOPS (DECL_INITIAL (x));
5269 if (DECL_INITIAL (x))
5271 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5272 constant_expression_warning (DECL_INITIAL (x));
5276 "bit-field `%s' width not an integer constant");
5277 DECL_INITIAL (x) = NULL;
5281 /* Detect invalid bit-field type. */
5282 if (DECL_INITIAL (x)
5283 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5284 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5286 error_with_decl (x, "bit-field `%s' has invalid type");
5287 DECL_INITIAL (x) = NULL;
5290 if (DECL_INITIAL (x) && pedantic
5291 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5292 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5293 /* Accept an enum that's equivalent to int or unsigned int. */
5294 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5295 && (TYPE_PRECISION (TREE_TYPE (x))
5296 == TYPE_PRECISION (integer_type_node))))
5297 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5299 /* Detect and ignore out of range field width and process valid
5301 if (DECL_INITIAL (x))
5303 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5304 error_with_decl (x, "negative width in bit-field `%s'");
5305 else if (0 < compare_tree_int (DECL_INITIAL (x),
5306 TYPE_PRECISION (TREE_TYPE (x))))
5307 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5308 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5309 error_with_decl (x, "zero width for bit-field `%s'");
5312 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5313 unsigned HOST_WIDE_INT width
5314 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5316 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5317 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5318 TREE_UNSIGNED (TREE_TYPE (x)))
5320 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5321 TREE_UNSIGNED (TREE_TYPE (x))))))
5322 warning_with_decl (x,
5323 "`%s' is narrower than values of its type");
5325 DECL_SIZE (x) = bitsize_int (width);
5326 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5330 /* field size 0 => force desired amount of alignment. */
5331 #ifdef EMPTY_FIELD_BOUNDARY
5332 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5334 #ifdef PCC_BITFIELD_TYPE_MATTERS
5335 if (PCC_BITFIELD_TYPE_MATTERS)
5337 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5338 TYPE_ALIGN (TREE_TYPE (x)));
5339 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5346 else if (TREE_TYPE (x) != error_mark_node)
5348 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5349 : TYPE_ALIGN (TREE_TYPE (x)));
5351 /* Non-bit-fields are aligned for their type, except packed
5352 fields which require only BITS_PER_UNIT alignment. */
5353 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5354 if (! DECL_PACKED (x))
5355 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5358 DECL_INITIAL (x) = 0;
5361 /* Delete all duplicate fields from the fieldlist */
5362 for (x = fieldlist; x && TREE_CHAIN (x);)
5363 /* Anonymous fields aren't duplicates. */
5364 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5368 register tree y = fieldlist;
5372 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5378 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5380 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5381 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5383 else x = TREE_CHAIN (x);
5386 /* Now we have the nearly final fieldlist. Record it,
5387 then lay out the structure or union (including the fields). */
5389 TYPE_FIELDS (t) = fieldlist;
5393 /* Delete all zero-width bit-fields from the fieldlist */
5395 tree *fieldlistp = &fieldlist;
5397 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5398 *fieldlistp = TREE_CHAIN (*fieldlistp);
5400 fieldlistp = &TREE_CHAIN (*fieldlistp);
5403 /* Now we have the truly final field list.
5404 Store it in this type and in the variants. */
5406 TYPE_FIELDS (t) = fieldlist;
5408 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5410 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5411 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5412 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5413 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5416 /* If this was supposed to be a transparent union, but we can't
5417 make it one, warn and turn off the flag. */
5418 if (TREE_CODE (t) == UNION_TYPE
5419 && TYPE_TRANSPARENT_UNION (t)
5420 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5422 TYPE_TRANSPARENT_UNION (t) = 0;
5423 warning ("union cannot be made transparent");
5426 /* If this structure or union completes the type of any previous
5427 variable declaration, lay it out and output its rtl. */
5429 if (current_binding_level->n_incomplete != 0)
5432 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5434 if (TREE_TYPE (decl) == t
5435 && TREE_CODE (decl) != TYPE_DECL)
5437 layout_decl (decl, 0);
5438 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5439 maybe_objc_check_decl (decl);
5440 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5443 --current_binding_level->n_incomplete;
5445 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5446 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5448 tree element = TREE_TYPE (decl);
5449 while (TREE_CODE (element) == ARRAY_TYPE)
5450 element = TREE_TYPE (element);
5452 layout_array_type (TREE_TYPE (decl));
5457 /* Finish debugging output for this type. */
5458 rest_of_type_compilation (t, toplevel);
5463 /* Lay out the type T, and its element type, and so on. */
5466 layout_array_type (t)
5469 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5470 layout_array_type (TREE_TYPE (t));
5474 /* Begin compiling the definition of an enumeration type.
5475 NAME is its name (or null if anonymous).
5476 Returns the type object, as yet incomplete.
5477 Also records info about it so that build_enumerator
5478 may be used to declare the individual values as they are read. */
5484 register tree enumtype = 0;
5486 /* If this is the real definition for a previous forward reference,
5487 fill in the contents in the same object that used to be the
5488 forward reference. */
5491 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5493 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5495 enumtype = make_node (ENUMERAL_TYPE);
5496 pushtag (name, enumtype);
5499 C_TYPE_BEING_DEFINED (enumtype) = 1;
5501 if (TYPE_VALUES (enumtype) != 0)
5503 /* This enum is a named one that has been declared already. */
5504 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5506 /* Completely replace its old definition.
5507 The old enumerators remain defined, however. */
5508 TYPE_VALUES (enumtype) = 0;
5511 enum_next_value = integer_zero_node;
5514 if (flag_short_enums)
5515 TYPE_PACKED (enumtype) = 1;
5520 /* After processing and defining all the values of an enumeration type,
5521 install their decls in the enumeration type and finish it off.
5522 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5523 and ATTRIBUTES are the specified attributes.
5524 Returns ENUMTYPE. */
5527 finish_enum (enumtype, values, attributes)
5532 register tree pair, tem;
5533 tree minnode = 0, maxnode = 0;
5534 int precision, unsign;
5535 int toplevel = (global_binding_level == current_binding_level);
5537 if (in_parm_level_p ())
5538 warning ("enum defined inside parms");
5540 decl_attributes (enumtype, attributes, NULL_TREE);
5542 /* Calculate the maximum value of any enumerator in this type. */
5544 if (values == error_mark_node)
5545 minnode = maxnode = integer_zero_node;
5548 minnode = maxnode = TREE_VALUE (values);
5549 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5551 tree value = TREE_VALUE (pair);
5552 if (tree_int_cst_lt (maxnode, value))
5554 if (tree_int_cst_lt (value, minnode))
5559 /* Construct the final type of this enumeration. It is the same
5560 as one of the integral types - the narrowest one that fits, except
5561 that normally we only go as narrow as int - and signed iff any of
5562 the values are negative. */
5563 unsign = (tree_int_cst_sgn (minnode) >= 0);
5564 precision = MAX (min_precision (minnode, unsign),
5565 min_precision (maxnode, unsign));
5566 if (!TYPE_PACKED (enumtype))
5567 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5568 if (type_for_size (precision, unsign) == 0)
5570 warning ("enumeration values exceed range of largest integer");
5571 precision = TYPE_PRECISION (long_long_integer_type_node);
5574 TYPE_MIN_VALUE (enumtype) = minnode;
5575 TYPE_MAX_VALUE (enumtype) = maxnode;
5576 TYPE_PRECISION (enumtype) = precision;
5577 TREE_UNSIGNED (enumtype) = unsign;
5578 TYPE_SIZE (enumtype) = 0;
5579 layout_type (enumtype);
5581 if (values != error_mark_node)
5583 /* Change the type of the enumerators to be the enum type. We
5584 need to do this irrespective of the size of the enum, for
5585 proper type checking. Replace the DECL_INITIALs of the
5586 enumerators, and the value slots of the list, with copies
5587 that have the enum type; they cannot be modified in place
5588 because they may be shared (e.g. integer_zero_node) Finally,
5589 change the purpose slots to point to the names of the decls. */
5590 for (pair = values; pair; pair = TREE_CHAIN (pair))
5592 tree enu = TREE_PURPOSE (pair);
5594 TREE_TYPE (enu) = enumtype;
5595 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5596 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5597 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5598 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5599 DECL_MODE (enu) = TYPE_MODE (enumtype);
5600 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5602 TREE_PURPOSE (pair) = DECL_NAME (enu);
5603 TREE_VALUE (pair) = DECL_INITIAL (enu);
5606 TYPE_VALUES (enumtype) = values;
5609 /* Fix up all variant types of this enum type. */
5610 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5612 if (tem == enumtype)
5614 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5615 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5616 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5617 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5618 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5619 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5620 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5621 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5622 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5623 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5626 /* Finish debugging output for this type. */
5627 rest_of_type_compilation (enumtype, toplevel);
5632 /* Build and install a CONST_DECL for one value of the
5633 current enumeration type (one that was begun with start_enum).
5634 Return a tree-list containing the CONST_DECL and its value.
5635 Assignment of sequential values by default is handled here. */
5638 build_enumerator (name, value)
5641 register tree decl, type;
5643 /* Validate and default VALUE. */
5645 /* Remove no-op casts from the value. */
5647 STRIP_TYPE_NOPS (value);
5651 if (TREE_CODE (value) == INTEGER_CST)
5653 value = default_conversion (value);
5654 constant_expression_warning (value);
5658 error ("enumerator value for `%s' not integer constant",
5659 IDENTIFIER_POINTER (name));
5664 /* Default based on previous value. */
5665 /* It should no longer be possible to have NON_LVALUE_EXPR
5669 value = enum_next_value;
5671 error ("overflow in enumeration values");
5674 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5676 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5677 value = integer_zero_node;
5680 /* Set basis for default for next value. */
5681 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5682 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5684 /* Now create a declaration for the enum value name. */
5686 type = TREE_TYPE (value);
5687 type = type_for_size (MAX (TYPE_PRECISION (type),
5688 TYPE_PRECISION (integer_type_node)),
5690 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5691 && TREE_UNSIGNED (type)));
5693 decl = build_decl (CONST_DECL, name, type);
5694 DECL_INITIAL (decl) = convert (type, value);
5697 return tree_cons (decl, value, NULL_TREE);
5700 /* Create the FUNCTION_DECL for a function definition.
5701 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5702 the declaration; they describe the function's name and the type it returns,
5703 but twisted together in a fashion that parallels the syntax of C.
5705 This function creates a binding context for the function body
5706 as well as setting up the FUNCTION_DECL in current_function_decl.
5708 Returns 1 on success. If the DECLARATOR is not suitable for a function
5709 (it defines a datum instead), we return 0, which tells
5710 yyparse to report a parse error. */
5713 start_function (declspecs, declarator, prefix_attributes, attributes)
5714 tree declarator, declspecs, prefix_attributes, attributes;
5716 tree decl1, old_decl;
5718 int old_immediate_size_expand = immediate_size_expand;
5720 current_function_returns_value = 0; /* Assume, until we see it does. */
5721 current_function_returns_null = 0;
5722 warn_about_return_type = 0;
5723 current_extern_inline = 0;
5724 c_function_varargs = 0;
5726 shadowed_labels = 0;
5728 /* Don't expand any sizes in the return type of the function. */
5729 immediate_size_expand = 0;
5731 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5733 /* If the declarator is not suitable for a function definition,
5734 cause a syntax error. */
5737 immediate_size_expand = old_immediate_size_expand;
5741 decl_attributes (decl1, prefix_attributes, attributes);
5743 announce_function (decl1);
5745 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5747 error ("return type is an incomplete type");
5748 /* Make it return void instead. */
5750 = build_function_type (void_type_node,
5751 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5754 if (warn_about_return_type)
5755 pedwarn_c99 ("return type defaults to `int'");
5757 /* Save the parm names or decls from this function's declarator
5758 where store_parm_decls will find them. */
5759 current_function_parms = last_function_parms;
5760 current_function_parm_tags = last_function_parm_tags;
5762 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5763 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5764 DECL_INITIAL (decl1) = error_mark_node;
5766 /* If this definition isn't a prototype and we had a prototype declaration
5767 before, copy the arg type info from that prototype.
5768 But not if what we had before was a builtin function. */
5769 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5770 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5771 && !DECL_BUILT_IN (old_decl)
5772 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5773 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5774 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5776 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5777 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5778 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5781 /* If there is no explicit declaration, look for any out-of-scope implicit
5784 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5786 /* Optionally warn of old-fashioned def with no previous prototype. */
5787 if (warn_strict_prototypes
5788 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5789 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5790 warning ("function declaration isn't a prototype");
5791 /* Optionally warn of any global def with no previous prototype. */
5792 else if (warn_missing_prototypes
5793 && TREE_PUBLIC (decl1)
5794 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5795 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5796 warning_with_decl (decl1, "no previous prototype for `%s'");
5797 /* Optionally warn of any def with no previous prototype
5798 if the function has already been used. */
5799 else if (warn_missing_prototypes
5800 && old_decl != 0 && TREE_USED (old_decl)
5801 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5802 warning_with_decl (decl1,
5803 "`%s' was used with no prototype before its definition");
5804 /* Optionally warn of any global def with no previous declaration. */
5805 else if (warn_missing_declarations
5806 && TREE_PUBLIC (decl1)
5808 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5809 warning_with_decl (decl1, "no previous declaration for `%s'");
5810 /* Optionally warn of any def with no previous declaration
5811 if the function has already been used. */
5812 else if (warn_missing_declarations
5813 && old_decl != 0 && TREE_USED (old_decl)
5814 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5815 warning_with_decl (decl1,
5816 "`%s' was used with no declaration before its definition");
5818 /* This is a definition, not a reference.
5819 So normally clear DECL_EXTERNAL.
5820 However, `extern inline' acts like a declaration
5821 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5822 DECL_EXTERNAL (decl1) = current_extern_inline;
5824 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5825 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5828 /* This function exists in static storage.
5829 (This does not mean `static' in the C sense!) */
5830 TREE_STATIC (decl1) = 1;
5832 /* A nested function is not global. */
5833 if (current_function_decl != 0)
5834 TREE_PUBLIC (decl1) = 0;
5836 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5838 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5843 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5844 != integer_type_node)
5845 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5847 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5848 args = TREE_CHAIN (args))
5850 tree type = args ? TREE_VALUE (args) : 0;
5852 if (type == void_type_node)
5859 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5860 pedwarn_with_decl (decl1,
5861 "first argument of `%s' should be `int'");
5865 if (TREE_CODE (type) != POINTER_TYPE
5866 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5867 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5869 pedwarn_with_decl (decl1,
5870 "second argument of `%s' should be `char **'");
5874 if (TREE_CODE (type) != POINTER_TYPE
5875 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5876 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5878 pedwarn_with_decl (decl1,
5879 "third argument of `%s' should probably be `char **'");
5884 /* It is intentional that this message does not mention the third
5885 argument, which is warned for only pedantically, because it's
5886 blessed by mention in an appendix of the standard. */
5887 if (argct > 0 && (argct < 2 || argct > 3))
5888 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5890 if (argct == 3 && pedantic)
5891 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5893 if (! TREE_PUBLIC (decl1))
5894 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5897 /* Record the decl so that the function name is defined.
5898 If we already have a decl for this name, and it is a FUNCTION_DECL,
5899 use the old decl. */
5901 current_function_decl = pushdecl (decl1);
5904 declare_parm_level (1);
5905 current_binding_level->subblocks_tag_transparent = 1;
5907 make_function_rtl (current_function_decl);
5909 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5910 /* Promote the value to int before returning it. */
5911 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5913 /* It retains unsignedness if traditional
5914 or if not really getting wider. */
5915 if (TREE_UNSIGNED (restype)
5916 && (flag_traditional
5917 || (TYPE_PRECISION (restype)
5918 == TYPE_PRECISION (integer_type_node))))
5919 restype = unsigned_type_node;
5921 restype = integer_type_node;
5923 DECL_RESULT (current_function_decl)
5924 = build_decl (RESULT_DECL, NULL_TREE, restype);
5926 /* If this fcn was already referenced via a block-scope `extern' decl
5927 (or an implicit decl), propagate certain information about the usage. */
5928 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5929 TREE_ADDRESSABLE (current_function_decl) = 1;
5931 immediate_size_expand = old_immediate_size_expand;
5936 /* Record that this function is going to be a varargs function.
5937 This is called before store_parm_decls, which is too early
5938 to call mark_varargs directly. */
5943 c_function_varargs = 1;
5946 /* Store the parameter declarations into the current function declaration.
5947 This is called after parsing the parameter declarations, before
5948 digesting the body of the function.
5950 For an old-style definition, modify the function's type
5951 to specify at least the number of arguments. */
5956 register tree fndecl = current_function_decl;
5959 /* This is either a chain of PARM_DECLs (if a prototype was used)
5960 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5961 tree specparms = current_function_parms;
5963 /* This is a list of types declared among parms in a prototype. */
5964 tree parmtags = current_function_parm_tags;
5966 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5967 register tree parmdecls = getdecls ();
5969 /* This is a chain of any other decls that came in among the parm
5970 declarations. If a parm is declared with enum {foo, bar} x;
5971 then CONST_DECLs for foo and bar are put here. */
5974 /* Nonzero if this definition is written with a prototype. */
5977 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5979 /* This case is when the function was defined with an ANSI prototype.
5980 The parms already have decls, so we need not do anything here
5981 except record them as in effect
5982 and complain if any redundant old-style parm decls were written. */
5993 error_with_decl (fndecl,
5994 "parm types given both in parmlist and separately");
5995 /* Get rid of the erroneous decls; don't keep them on
5996 the list of parms, since they might not be PARM_DECLs. */
5997 for (decl = current_binding_level->names;
5998 decl; decl = TREE_CHAIN (decl))
5999 if (DECL_NAME (decl))
6000 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6001 for (link = current_binding_level->shadowed;
6002 link; link = TREE_CHAIN (link))
6003 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6004 current_binding_level->names = 0;
6005 current_binding_level->shadowed = 0;
6008 specparms = nreverse (specparms);
6009 for (parm = specparms; parm; parm = next)
6011 next = TREE_CHAIN (parm);
6012 if (TREE_CODE (parm) == PARM_DECL)
6014 if (DECL_NAME (parm) == 0)
6015 error_with_decl (parm, "parameter name omitted");
6016 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6017 && VOID_TYPE_P (TREE_TYPE (parm)))
6019 error_with_decl (parm, "parameter `%s' declared void");
6020 /* Change the type to error_mark_node so this parameter
6021 will be ignored by assign_parms. */
6022 TREE_TYPE (parm) = error_mark_node;
6028 /* If we find an enum constant or a type tag,
6029 put it aside for the moment. */
6030 TREE_CHAIN (parm) = 0;
6031 others = chainon (others, parm);
6035 /* Get the decls in their original chain order
6036 and record in the function. */
6037 DECL_ARGUMENTS (fndecl) = getdecls ();
6040 /* If this function takes a variable number of arguments,
6041 add a phony parameter to the end of the parm list,
6042 to represent the position of the first unnamed argument. */
6043 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6046 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6047 /* Let's hope the address of the unnamed parm
6048 won't depend on its type. */
6049 TREE_TYPE (dummy) = integer_type_node;
6050 DECL_ARG_TYPE (dummy) = integer_type_node;
6051 DECL_ARGUMENTS (fndecl)
6052 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6056 /* Now pushdecl the enum constants. */
6057 for (parm = others; parm; parm = next)
6059 next = TREE_CHAIN (parm);
6060 if (DECL_NAME (parm) == 0)
6062 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6064 else if (TREE_CODE (parm) != PARM_DECL)
6068 storetags (chainon (parmtags, gettags ()));
6072 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6073 each with a parm name as the TREE_VALUE.
6075 PARMDECLS is a chain of declarations for parameters.
6076 Warning! It can also contain CONST_DECLs which are not parameters
6077 but are names of enumerators of any enum types
6078 declared among the parameters.
6080 First match each formal parameter name with its declaration.
6081 Associate decls with the names and store the decls
6082 into the TREE_PURPOSE slots. */
6084 /* We use DECL_WEAK as a flag to show which parameters have been
6085 seen already since it is not used on PARM_DECL or CONST_DECL. */
6086 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6087 DECL_WEAK (parm) = 0;
6089 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6091 register tree tail, found = NULL;
6093 if (TREE_VALUE (parm) == 0)
6095 error_with_decl (fndecl,
6096 "parameter name missing from parameter list");
6097 TREE_PURPOSE (parm) = 0;
6101 /* See if any of the parmdecls specifies this parm by name.
6102 Ignore any enumerator decls. */
6103 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6104 if (DECL_NAME (tail) == TREE_VALUE (parm)
6105 && TREE_CODE (tail) == PARM_DECL)
6111 /* If declaration already marked, we have a duplicate name.
6112 Complain, and don't use this decl twice. */
6113 if (found && DECL_WEAK (found))
6115 error_with_decl (found, "multiple parameters named `%s'");
6119 /* If the declaration says "void", complain and ignore it. */
6120 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6122 error_with_decl (found, "parameter `%s' declared void");
6123 TREE_TYPE (found) = integer_type_node;
6124 DECL_ARG_TYPE (found) = integer_type_node;
6125 layout_decl (found, 0);
6128 /* Traditionally, a parm declared float is actually a double. */
6129 if (found && flag_traditional
6130 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6132 TREE_TYPE (found) = double_type_node;
6133 DECL_ARG_TYPE (found) = double_type_node;
6134 layout_decl (found, 0);
6137 /* If no declaration found, default to int. */
6140 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6142 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6143 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6144 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6146 warning_with_decl (found, "type of `%s' defaults to `int'");
6150 TREE_PURPOSE (parm) = found;
6152 /* Mark this decl as "already found" */
6153 DECL_WEAK (found) = 1;
6156 /* Put anything which is on the parmdecls chain and which is
6157 not a PARM_DECL onto the list NONPARMS. (The types of
6158 non-parm things which might appear on the list include
6159 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6160 any actual PARM_DECLs not matched with any names. */
6163 for (parm = parmdecls; parm; )
6165 tree next = TREE_CHAIN (parm);
6166 TREE_CHAIN (parm) = 0;
6168 if (TREE_CODE (parm) != PARM_DECL)
6169 nonparms = chainon (nonparms, parm);
6172 /* Complain about args with incomplete types. */
6173 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6175 error_with_decl (parm, "parameter `%s' has incomplete type");
6176 TREE_TYPE (parm) = error_mark_node;
6179 if (! DECL_WEAK (parm))
6181 error_with_decl (parm,
6182 "declaration for parameter `%s' but no such parameter");
6183 /* Pretend the parameter was not missing.
6184 This gets us to a standard state and minimizes
6185 further error messages. */
6187 = chainon (specparms,
6188 tree_cons (parm, NULL_TREE, NULL_TREE));
6195 /* Chain the declarations together in the order of the list of names. */
6196 /* Store that chain in the function decl, replacing the list of names. */
6198 DECL_ARGUMENTS (fndecl) = 0;
6201 for (last = 0; parm; parm = TREE_CHAIN (parm))
6202 if (TREE_PURPOSE (parm))
6205 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6207 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6208 last = TREE_PURPOSE (parm);
6209 TREE_CHAIN (last) = 0;
6213 /* If there was a previous prototype,
6214 set the DECL_ARG_TYPE of each argument according to
6215 the type previously specified, and report any mismatches. */
6217 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6220 for (parm = DECL_ARGUMENTS (fndecl),
6221 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6222 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6223 != void_type_node));
6224 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6226 if (parm == 0 || type == 0
6227 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6229 error ("number of arguments doesn't match prototype");
6230 error_with_file_and_line (current_function_prototype_file,
6231 current_function_prototype_line,
6232 "prototype declaration");
6235 /* Type for passing arg must be consistent
6236 with that declared for the arg. */
6237 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6239 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6240 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6242 /* Adjust argument to match prototype. E.g. a previous
6243 `int foo(float);' prototype causes
6244 `int foo(x) float x; {...}' to be treated like
6245 `int foo(float x) {...}'. This is particularly
6246 useful for argument types like uid_t. */
6247 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6249 if (PROMOTE_PROTOTYPES
6250 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6251 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6252 && TYPE_PRECISION (TREE_TYPE (parm))
6253 < TYPE_PRECISION (integer_type_node))
6254 DECL_ARG_TYPE (parm) = integer_type_node;
6258 pedwarn ("promoted argument `%s' doesn't match prototype",
6259 IDENTIFIER_POINTER (DECL_NAME (parm)));
6260 warning_with_file_and_line
6261 (current_function_prototype_file,
6262 current_function_prototype_line,
6263 "prototype declaration");
6266 /* If -traditional, allow `int' argument to match
6267 `unsigned' prototype. */
6268 else if (! (flag_traditional
6269 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6270 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6272 error ("argument `%s' doesn't match prototype",
6273 IDENTIFIER_POINTER (DECL_NAME (parm)));
6274 error_with_file_and_line (current_function_prototype_file,
6275 current_function_prototype_line,
6276 "prototype declaration");
6280 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6283 /* Otherwise, create a prototype that would match. */
6287 tree actual = 0, last = 0, type;
6289 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6291 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6293 TREE_CHAIN (last) = type;
6298 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6300 TREE_CHAIN (last) = type;
6304 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6305 of the type of this function, but we need to avoid having this
6306 affect the types of other similarly-typed functions, so we must
6307 first force the generation of an identical (but separate) type
6308 node for the relevant function type. The new node we create
6309 will be a variant of the main variant of the original function
6312 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6314 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6317 /* Now store the final chain of decls for the arguments
6318 as the decl-chain of the current lexical scope.
6319 Put the enumerators in as well, at the front so that
6320 DECL_ARGUMENTS is not modified. */
6322 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6325 /* Make sure the binding level for the top of the function body
6326 gets a BLOCK if there are any in the function.
6327 Otherwise, the dbx output is wrong. */
6329 keep_next_if_subblocks = 1;
6331 /* ??? This might be an improvement,
6332 but needs to be thought about some more. */
6334 keep_next_level_flag = 1;
6337 /* Write a record describing this function definition to the prototypes
6338 file (if requested). */
6340 gen_aux_info_record (fndecl, 1, 0, prototype);
6342 /* Initialize the RTL code for the function. */
6344 init_function_start (fndecl, input_filename, lineno);
6346 /* If this is a varargs function, inform function.c. */
6348 if (c_function_varargs)
6351 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6353 declare_function_name ();
6355 /* Set up parameters and prepare for return, for the function. */
6357 expand_function_start (fndecl, 0);
6359 /* If this function is `main', emit a call to `__main'
6360 to run global initializers, etc. */
6361 if (DECL_NAME (fndecl)
6362 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6363 && DECL_CONTEXT (fndecl) == NULL_TREE)
6364 expand_main_function ();
6367 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6368 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6369 stands for an ellipsis in the identifier list.
6371 PARMLIST is the data returned by get_parm_info for the
6372 parmlist that follows the semicolon.
6374 We return a value of the same sort that get_parm_info returns,
6375 except that it describes the combination of identifiers and parmlist. */
6378 combine_parm_decls (specparms, parmlist, void_at_end)
6379 tree specparms, parmlist;
6382 register tree fndecl = current_function_decl;
6385 tree parmdecls = TREE_PURPOSE (parmlist);
6387 /* This is a chain of any other decls that came in among the parm
6388 declarations. They were separated already by get_parm_info,
6389 so we just need to keep them separate. */
6390 tree nonparms = TREE_VALUE (parmlist);
6394 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6395 DECL_WEAK (parm) = 0;
6397 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6399 register tree tail, found = NULL;
6401 /* See if any of the parmdecls specifies this parm by name. */
6402 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6403 if (DECL_NAME (tail) == TREE_VALUE (parm))
6409 /* If declaration already marked, we have a duplicate name.
6410 Complain, and don't use this decl twice. */
6411 if (found && DECL_WEAK (found))
6413 error_with_decl (found, "multiple parameters named `%s'");
6417 /* If the declaration says "void", complain and ignore it. */
6418 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6420 error_with_decl (found, "parameter `%s' declared void");
6421 TREE_TYPE (found) = integer_type_node;
6422 DECL_ARG_TYPE (found) = integer_type_node;
6423 layout_decl (found, 0);
6426 /* Traditionally, a parm declared float is actually a double. */
6427 if (found && flag_traditional
6428 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6430 TREE_TYPE (found) = double_type_node;
6431 DECL_ARG_TYPE (found) = double_type_node;
6432 layout_decl (found, 0);
6435 /* If no declaration found, default to int. */
6438 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6440 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6441 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6442 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6443 error_with_decl (found, "type of parameter `%s' is not declared");
6447 TREE_PURPOSE (parm) = found;
6449 /* Mark this decl as "already found". */
6450 DECL_WEAK (found) = 1;
6453 /* Complain about any actual PARM_DECLs not matched with any names. */
6455 for (parm = parmdecls; parm; )
6457 tree next = TREE_CHAIN (parm);
6458 TREE_CHAIN (parm) = 0;
6460 /* Complain about args with incomplete types. */
6461 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6463 error_with_decl (parm, "parameter `%s' has incomplete type");
6464 TREE_TYPE (parm) = error_mark_node;
6467 if (! DECL_WEAK (parm))
6469 error_with_decl (parm,
6470 "declaration for parameter `%s' but no such parameter");
6471 /* Pretend the parameter was not missing.
6472 This gets us to a standard state and minimizes
6473 further error messages. */
6475 = chainon (specparms,
6476 tree_cons (parm, NULL_TREE, NULL_TREE));
6482 /* Chain the declarations together in the order of the list of names.
6483 At the same time, build up a list of their types, in reverse order. */
6489 for (last = 0; parm; parm = TREE_CHAIN (parm))
6490 if (TREE_PURPOSE (parm))
6493 parmdecls = TREE_PURPOSE (parm);
6495 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6496 last = TREE_PURPOSE (parm);
6497 TREE_CHAIN (last) = 0;
6499 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6504 return tree_cons (parmdecls, nonparms,
6505 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6507 return tree_cons (parmdecls, nonparms, nreverse (types));
6510 /* Finish up a function declaration and compile that function
6511 all the way to assembler language output. The free the storage
6512 for the function definition.
6514 This is called after parsing the body of the function definition.
6516 NESTED is nonzero if the function being finished is nested in another. */
6519 finish_function (nested)
6522 register tree fndecl = current_function_decl;
6524 /* TREE_READONLY (fndecl) = 1;
6525 This caused &foo to be of type ptr-to-const-function
6526 which then got a warning when stored in a ptr-to-function variable. */
6529 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6531 /* Must mark the RESULT_DECL as being in this function. */
6533 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6535 /* Obey `register' declarations if `setjmp' is called in this fn. */
6536 if (flag_traditional && current_function_calls_setjmp)
6538 setjmp_protect (DECL_INITIAL (fndecl));
6539 setjmp_protect_args ();
6542 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6544 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6545 != integer_type_node)
6547 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6548 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6550 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6554 #ifdef DEFAULT_MAIN_RETURN
6555 /* Make it so that `main' always returns success by default. */
6556 DEFAULT_MAIN_RETURN;
6561 /* Generate rtl for function exit. */
6562 expand_function_end (input_filename, lineno, 0);
6564 /* So we can tell if jump_optimize sets it to 1. */
6567 /* If this is a nested function, protect the local variables in the stack
6568 above us from being collected while we're compiling this function. */
6570 ggc_push_context ();
6572 /* Run the optimizers and output the assembler code for this function. */
6573 rest_of_compilation (fndecl);
6575 /* Undo the GC context switch. */
6579 current_function_returns_null |= can_reach_end;
6581 if (warn_missing_noreturn
6582 && !TREE_THIS_VOLATILE (fndecl)
6583 && !current_function_returns_null
6584 && !current_function_returns_value)
6585 warning ("function might be possible candidate for attribute `noreturn'");
6587 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6588 warning ("`noreturn' function does return");
6589 else if (warn_return_type && can_reach_end
6590 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6591 /* If this function returns non-void and control can drop through,
6593 warning ("control reaches end of non-void function");
6594 /* With just -W, complain only if function returns both with
6595 and without a value. */
6596 else if (extra_warnings
6597 && current_function_returns_value && current_function_returns_null)
6598 warning ("this function may return with or without a value");
6600 /* If requested, warn about function definitions where the function will
6601 return a value (usually of some struct or union type) which itself will
6602 take up a lot of stack space. */
6604 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6606 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6608 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6609 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6612 unsigned int size_as_int
6613 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6615 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6616 warning_with_decl (fndecl,
6617 "size of return value of `%s' is %u bytes",
6620 warning_with_decl (fndecl,
6621 "size of return value of `%s' is larger than %d bytes",
6626 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6628 /* Stop pointing to the local nodes about to be freed.
6629 But DECL_INITIAL must remain nonzero so we know this
6630 was an actual function definition.
6631 For a nested function, this is done in pop_c_function_context.
6632 If rest_of_compilation set this to 0, leave it 0. */
6633 if (DECL_INITIAL (fndecl) != 0)
6634 DECL_INITIAL (fndecl) = error_mark_node;
6636 DECL_ARGUMENTS (fndecl) = 0;
6639 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6641 #ifndef ASM_OUTPUT_CONSTRUCTOR
6642 if (! flag_gnu_linker)
6643 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6646 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6649 if (DECL_STATIC_DESTRUCTOR (fndecl))
6651 #ifndef ASM_OUTPUT_DESTRUCTOR
6652 if (! flag_gnu_linker)
6653 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6656 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6661 /* Let the error reporting routines know that we're outside a
6662 function. For a nested function, this value is used in
6663 pop_c_function_context and then reset via pop_function_context. */
6664 current_function_decl = NULL;
6668 /* Save and restore the variables in this file and elsewhere
6669 that keep track of the progress of compilation of the current function.
6670 Used for nested functions. */
6672 struct language_function
6675 tree shadowed_labels;
6678 int warn_about_return_type;
6680 struct binding_level *binding_level;
6683 /* Save and reinitialize the variables
6684 used during compilation of a C function. */
6687 push_c_function_context (f)
6690 struct language_function *p;
6691 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6694 p->named_labels = named_labels;
6695 p->shadowed_labels = shadowed_labels;
6696 p->returns_value = current_function_returns_value;
6697 p->returns_null = current_function_returns_null;
6698 p->warn_about_return_type = warn_about_return_type;
6699 p->extern_inline = current_extern_inline;
6700 p->binding_level = current_binding_level;
6703 /* Restore the variables used during compilation of a C function. */
6706 pop_c_function_context (f)
6709 struct language_function *p = f->language;
6712 /* Bring back all the labels that were shadowed. */
6713 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6714 if (DECL_NAME (TREE_VALUE (link)) != 0)
6715 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6716 = TREE_VALUE (link);
6718 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6720 /* Stop pointing to the local nodes about to be freed. */
6721 /* But DECL_INITIAL must remain nonzero so we know this
6722 was an actual function definition. */
6723 DECL_INITIAL (current_function_decl) = error_mark_node;
6724 DECL_ARGUMENTS (current_function_decl) = 0;
6727 named_labels = p->named_labels;
6728 shadowed_labels = p->shadowed_labels;
6729 current_function_returns_value = p->returns_value;
6730 current_function_returns_null = p->returns_null;
6731 warn_about_return_type = p->warn_about_return_type;
6732 current_extern_inline = p->extern_inline;
6733 current_binding_level = p->binding_level;
6739 /* Mark the language specific parts of F for GC. */
6741 mark_c_function_context (f)
6744 struct language_function *p = f->language;
6749 ggc_mark_tree (p->shadowed_labels);
6750 ggc_mark_tree (p->named_labels);
6751 mark_binding_level (&p->binding_level);
6754 /* integrate_decl_tree calls this function, but since we don't use the
6755 DECL_LANG_SPECIFIC field, this is a no-op. */
6758 copy_lang_decl (node)
6759 tree node ATTRIBUTE_UNUSED;
6763 /* Mark ARG for GC. */
6765 lang_mark_false_label_stack (arg)
6766 struct label_node *arg;
6768 /* C doesn't use false_label_stack. It better be NULL. */
6773 /* Mark the language specific bits in T for GC. */
6778 if (TREE_CODE (t) == IDENTIFIER_NODE)
6780 struct lang_identifier *i = (struct lang_identifier *) t;
6781 ggc_mark_tree (i->global_value);
6782 ggc_mark_tree (i->local_value);
6783 ggc_mark_tree (i->label_value);
6784 ggc_mark_tree (i->implicit_decl);
6785 ggc_mark_tree (i->error_locus);
6786 ggc_mark_tree (i->limbo_value);
6788 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6789 ggc_mark (TYPE_LANG_SPECIFIC (t));