1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
43 extern cpp_reader parse_in;
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL, /* Ordinary declaration */
49 FUNCDEF, /* Function definition */
50 PARM, /* Declaration of parm before function body */
51 FIELD, /* Declaration inside struct or union */
52 BITFIELD, /* Likewise but with specified width */
53 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* We let tm.h override the types used here, to handle trivial differences
56 such as the choice of unsigned int or long unsigned int for size_t.
57 When machines start needing nontrivial differences in the size type,
58 it would be best to do something here to figure out automatically
59 from other information what type to use. */
62 #define SIZE_TYPE "long unsigned int"
66 #define PTRDIFF_TYPE "long int"
70 #define WCHAR_TYPE "int"
76 /* Nonzero if we have seen an invalid cross reference
77 to a struct, union, or enum, but not yet printed the message. */
79 tree pending_invalid_xref;
80 /* File and line to appear in the eventual error message. */
81 char *pending_invalid_xref_file;
82 int pending_invalid_xref_line;
84 /* While defining an enum type, this is 1 plus the last enumerator
85 constant value. Note that will do not have to save this or `enum_overflow'
86 around nested function definition since such a definition could only
87 occur in an enum value expression and we don't use these variables in
90 static tree enum_next_value;
92 /* Nonzero means that there was overflow computing enum_next_value. */
94 static int enum_overflow;
96 /* Parsing a function declarator leaves a list of parameter names
97 or a chain or parameter decls here. */
99 static tree last_function_parms;
101 /* Parsing a function declarator leaves here a chain of structure
102 and enum types declared in the parmlist. */
104 static tree last_function_parm_tags;
106 /* After parsing the declarator that starts a function definition,
107 `start_function' puts here the list of parameter names or chain of decls.
108 `store_parm_decls' finds it here. */
110 static tree current_function_parms;
112 /* Similar, for last_function_parm_tags. */
113 static tree current_function_parm_tags;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
117 static char *current_function_prototype_file;
118 static int current_function_prototype_line;
120 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
121 that have names. Here so we can clear out their names' definitions
122 at the end of the function. */
124 static tree named_labels;
126 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
128 static tree shadowed_labels;
130 /* Nonzero when store_parm_decls is called indicates a varargs function.
131 Value not meaningful after store_parm_decls. */
133 static int c_function_varargs;
135 /* The FUNCTION_DECL for the function currently being compiled,
136 or 0 if between functions. */
137 tree current_function_decl;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a return statement that specifies a return value is seen. */
142 int current_function_returns_value;
144 /* Set to 0 at beginning of a function definition, set to 1 if
145 a return statement with no argument is seen. */
147 int current_function_returns_null;
149 /* Set to nonzero by `grokdeclarator' for a function
150 whose return type is defaulted, if warnings for this are desired. */
152 static int warn_about_return_type;
154 /* Nonzero when starting a function declared `extern inline'. */
156 static int current_extern_inline;
158 /* For each binding contour we allocate a binding_level structure
159 * which records the names defined in that contour.
162 * 1) one for each function definition,
163 * where internal declarations of the parameters appear.
164 * 2) one for each compound statement,
165 * to record its declarations.
167 * The current meaning of a name can be found by searching the levels from
168 * the current one out to the global one.
171 /* Note that the information in the `names' component of the global contour
172 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
176 /* A chain of _DECL nodes for all variables, constants, functions,
177 and typedef types. These are in the reverse of the order supplied.
181 /* A list of structure, union and enum definitions,
182 * for looking up tag names.
183 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
184 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
185 * or ENUMERAL_TYPE node.
189 /* For each level, a list of shadowed outer-level local definitions
190 to be restored when this level is popped.
191 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
192 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
195 /* For each level (except not the global one),
196 a chain of BLOCK nodes for all the levels
197 that were entered and exited one level down. */
200 /* The BLOCK node for this level, if one has been preallocated.
201 If 0, the BLOCK is allocated (if needed) when the level is popped. */
204 /* The binding level which this one is contained in (inherits from). */
205 struct binding_level *level_chain;
207 /* Nonzero for the level that holds the parameters of a function. */
210 /* Nonzero if this level "doesn't exist" for tags. */
211 char tag_transparent;
213 /* Nonzero if sublevels of this level "don't exist" for tags.
214 This is set in the parm level of a function definition
215 while reading the function body, so that the outermost block
216 of the function body will be tag-transparent. */
217 char subblocks_tag_transparent;
219 /* Nonzero means make a BLOCK for this level regardless of all else. */
222 /* Nonzero means make a BLOCK if this level has any subblocks. */
223 char keep_if_subblocks;
225 /* Number of decls in `names' that have incomplete
226 structure or union types. */
229 /* A list of decls giving the (reversed) specified order of parms,
230 not including any forward-decls in the parmlist.
231 This is so we can put the parms in proper order for assign_parms. */
235 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
237 /* The binding level currently in effect. */
239 static struct binding_level *current_binding_level;
241 /* A chain of binding_level structures awaiting reuse. */
243 static struct binding_level *free_binding_level;
245 /* The outermost binding level, for names of file scope.
246 This is created when the compiler is started and exists
247 through the entire run. */
249 static struct binding_level *global_binding_level;
251 /* Binding level structures are initialized by copying this one. */
253 static struct binding_level clear_binding_level
254 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
257 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
259 static int keep_next_level_flag;
261 /* Nonzero means make a BLOCK for the next level pushed
262 if it has subblocks. */
264 static int keep_next_if_subblocks;
266 /* The chain of outer levels of label scopes.
267 This uses the same data structure used for binding levels,
268 but it works differently: each link in the chain records
269 saved values of named_labels and shadowed_labels for
270 a label binding level outside the current one. */
272 static struct binding_level *label_level_chain;
274 /* Functions called automatically at the beginning and end of execution. */
276 tree static_ctors, static_dtors;
278 /* Forward declarations. */
280 static struct binding_level * make_binding_level PROTO((void));
281 static void mark_binding_level PROTO((void *));
282 static void clear_limbo_values PROTO((tree));
283 static int duplicate_decls PROTO((tree, tree, int));
284 static int redeclaration_error_message PROTO((tree, tree));
285 static void storedecls PROTO((tree));
286 static void storetags PROTO((tree));
287 static tree lookup_tag PROTO((enum tree_code, tree,
288 struct binding_level *, int));
289 static tree lookup_tag_reverse PROTO((tree));
290 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
292 static tree grokparms PROTO((tree, int));
293 static int field_decl_cmp PROTO((const PTR, const PTR));
294 static void layout_array_type PROTO((tree));
296 /* C-specific option variables. */
298 /* Nonzero means allow type mismatches in conditional expressions;
299 just make their values `void'. */
301 int flag_cond_mismatch;
303 /* Nonzero means give `double' the same size as `float'. */
305 int flag_short_double;
307 /* Nonzero means don't recognize the keyword `asm'. */
311 /* Nonzero means don't recognize any builtin functions. */
315 /* Nonzero means don't recognize the non-ANSI builtin functions.
318 int flag_no_nonansi_builtin;
320 /* Nonzero means do some things the same way PCC does. */
322 int flag_traditional;
324 /* Nonzero means use the ISO C9x dialect of C. */
328 /* Nonzero means that we have builtin functions, and main is an int */
332 /* Nonzero means to allow single precision math even if we're generally
333 being traditional. */
334 int flag_allow_single_precision = 0;
336 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
338 int flag_signed_bitfields = 1;
339 int explicit_flag_signed_bitfields = 0;
341 /* Nonzero means warn about use of implicit int. */
343 int warn_implicit_int;
345 /* Nonzero means warn about usage of long long when `-pedantic'. */
347 int warn_long_long = 1;
349 /* Nonzero means message about use of implicit function declarations;
350 1 means warning; 2 means error. */
352 int mesg_implicit_function_declaration;
354 /* Nonzero means give string constants the type `const char *'
355 to get extra warnings from them. These warnings will be too numerous
356 to be useful, except in thoroughly ANSIfied programs. */
358 int flag_const_strings;
360 /* Nonzero means warn about pointer casts that can drop a type qualifier
361 from the pointer target type. */
365 /* Nonzero means warn when casting a function call to a type that does
366 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
367 when there is no previous declaration of sqrt or malloc. */
369 int warn_bad_function_cast;
371 /* Warn about functions which might be candidates for attribute noreturn. */
373 int warn_missing_noreturn;
375 /* Warn about traditional constructs whose meanings changed in ANSI C. */
377 int warn_traditional;
379 /* Nonzero means warn about sizeof(function) or addition/subtraction
380 of function pointers. */
382 int warn_pointer_arith;
384 /* Nonzero means warn for non-prototype function decls
385 or non-prototyped defs without previous prototype. */
387 int warn_strict_prototypes;
389 /* Nonzero means warn for any global function def
390 without separate previous prototype decl. */
392 int warn_missing_prototypes;
394 /* Nonzero means warn for any global function def
395 without separate previous decl. */
397 int warn_missing_declarations;
399 /* Nonzero means warn about multiple (redundant) decls for the same single
400 variable or function. */
402 int warn_redundant_decls = 0;
404 /* Nonzero means warn about extern declarations of objects not at
405 file-scope level and about *all* declarations of functions (whether
406 extern or static) not at file-scope level. Note that we exclude
407 implicit function declarations. To get warnings about those, use
410 int warn_nested_externs = 0;
412 /* Warn about *printf or *scanf format/argument anomalies. */
416 /* Warn about a subscript that has type char. */
418 int warn_char_subscripts = 0;
420 /* Warn if a type conversion is done that might have confusing results. */
424 /* Warn if adding () is suggested. */
426 int warn_parentheses;
428 /* Warn if initializer is not completely bracketed. */
430 int warn_missing_braces;
432 /* Warn if main is suspicious. */
436 /* Warn about #pragma directives that are not recognised. */
438 int warn_unknown_pragmas = 0; /* Tri state variable. */
440 /* Warn about comparison of signed and unsigned values.
441 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
443 int warn_sign_compare = -1;
445 /* Nonzero means warn about use of multicharacter literals. */
447 int warn_multichar = 1;
449 /* Nonzero means `$' can be in an identifier. */
451 #ifndef DOLLARS_IN_IDENTIFIERS
452 #define DOLLARS_IN_IDENTIFIERS 1
454 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
456 /* Decode the string P as a language-specific option for C.
457 Return the number of strings consumed. Should not complain
458 if it does not recognise the option. */
461 c_decode_option (argc, argv)
462 int argc ATTRIBUTE_UNUSED;
465 int strings_processed;
468 strings_processed = cpp_handle_option (&parse_in, argc, argv);
470 strings_processed = 0;
471 #endif /* ! USE_CPPLIB */
473 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
475 flag_traditional = 1;
476 flag_writable_strings = 1;
478 else if (!strcmp (p, "-fallow-single-precision"))
479 flag_allow_single_precision = 1;
480 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
485 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
489 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
493 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
495 flag_traditional = 0;
496 flag_writable_strings = 0;
498 else if (!strncmp (p, "-std=", 5))
500 /* Select the appropriate language standard. We currently
502 -std=iso9899:1990 same as -ansi
503 -std=iso9899:199409 ISO C as modified in amend. 1
504 -std=iso9899:199x ISO C 9x
505 -std=c89 same as -std=iso9899:1990
506 -std=c9x same as -std=iso9899:199x
507 -std=gnu89 default, iso9899:1990 + gnu extensions
508 -std=gnu9x iso9899:199x + gnu extensions
510 const char *argstart = &p[5];
512 if (!strcmp (argstart, "iso9899:1990")
513 || !strcmp (argstart, "c89"))
516 flag_traditional = 0;
517 flag_writable_strings = 0;
519 flag_no_nonansi_builtin = 1;
522 else if (!strcmp (argstart, "iso9899:199409"))
524 /* ??? The changes since ISO C 1990 are not supported. */
527 else if (!strcmp (argstart, "iso9899:199x")
528 || !strcmp (argstart, "c9x"))
530 flag_traditional = 0;
531 flag_writable_strings = 0;
533 flag_no_nonansi_builtin = 1;
536 else if (!strcmp (argstart, "gnu89"))
538 flag_traditional = 0;
539 flag_writable_strings = 0;
541 flag_no_nonansi_builtin = 0;
544 else if (!strcmp (argstart, "gnu9x"))
546 flag_traditional = 0;
547 flag_writable_strings = 0;
549 flag_no_nonansi_builtin = 0;
553 error ("unknown C standard `%s'", argstart);
555 else if (!strcmp (p, "-fdollars-in-identifiers"))
556 dollars_in_ident = 1;
557 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
558 dollars_in_ident = 0;
559 else if (!strcmp (p, "-fsigned-char"))
560 flag_signed_char = 1;
561 else if (!strcmp (p, "-funsigned-char"))
562 flag_signed_char = 0;
563 else if (!strcmp (p, "-fno-signed-char"))
564 flag_signed_char = 0;
565 else if (!strcmp (p, "-fno-unsigned-char"))
566 flag_signed_char = 1;
567 else if (!strcmp (p, "-fsigned-bitfields")
568 || !strcmp (p, "-fno-unsigned-bitfields"))
570 flag_signed_bitfields = 1;
571 explicit_flag_signed_bitfields = 1;
573 else if (!strcmp (p, "-funsigned-bitfields")
574 || !strcmp (p, "-fno-signed-bitfields"))
576 flag_signed_bitfields = 0;
577 explicit_flag_signed_bitfields = 1;
579 else if (!strcmp (p, "-fshort-enums"))
580 flag_short_enums = 1;
581 else if (!strcmp (p, "-fno-short-enums"))
582 flag_short_enums = 0;
583 else if (!strcmp (p, "-fcond-mismatch"))
584 flag_cond_mismatch = 1;
585 else if (!strcmp (p, "-fno-cond-mismatch"))
586 flag_cond_mismatch = 0;
587 else if (!strcmp (p, "-fshort-double"))
588 flag_short_double = 1;
589 else if (!strcmp (p, "-fno-short-double"))
590 flag_short_double = 0;
591 else if (!strcmp (p, "-fasm"))
593 else if (!strcmp (p, "-fno-asm"))
595 else if (!strcmp (p, "-fbuiltin"))
597 else if (!strcmp (p, "-fno-builtin"))
599 else if (!strcmp (p, "-ansi"))
601 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
602 mesg_implicit_function_declaration = 2;
603 else if (!strcmp (p, "-Wimplicit-function-declaration"))
604 mesg_implicit_function_declaration = 1;
605 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
606 mesg_implicit_function_declaration = 0;
607 else if (!strcmp (p, "-Wimplicit-int"))
608 warn_implicit_int = 1;
609 else if (!strcmp (p, "-Wno-implicit-int"))
610 warn_implicit_int = 0;
611 else if (!strcmp (p, "-Wimplicit"))
613 warn_implicit_int = 1;
614 if (mesg_implicit_function_declaration != 2)
615 mesg_implicit_function_declaration = 1;
617 else if (!strcmp (p, "-Wno-implicit"))
618 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
619 else if (!strcmp (p, "-Wlong-long"))
621 else if (!strcmp (p, "-Wno-long-long"))
623 else if (!strcmp (p, "-Wwrite-strings"))
624 flag_const_strings = 1;
625 else if (!strcmp (p, "-Wno-write-strings"))
626 flag_const_strings = 0;
627 else if (!strcmp (p, "-Wcast-qual"))
629 else if (!strcmp (p, "-Wno-cast-qual"))
631 else if (!strcmp (p, "-Wbad-function-cast"))
632 warn_bad_function_cast = 1;
633 else if (!strcmp (p, "-Wno-bad-function-cast"))
634 warn_bad_function_cast = 0;
635 else if (!strcmp (p, "-Wmissing-noreturn"))
636 warn_missing_noreturn = 1;
637 else if (!strcmp (p, "-Wno-missing-noreturn"))
638 warn_missing_noreturn = 0;
639 else if (!strcmp (p, "-Wpointer-arith"))
640 warn_pointer_arith = 1;
641 else if (!strcmp (p, "-Wno-pointer-arith"))
642 warn_pointer_arith = 0;
643 else if (!strcmp (p, "-Wstrict-prototypes"))
644 warn_strict_prototypes = 1;
645 else if (!strcmp (p, "-Wno-strict-prototypes"))
646 warn_strict_prototypes = 0;
647 else if (!strcmp (p, "-Wmissing-prototypes"))
648 warn_missing_prototypes = 1;
649 else if (!strcmp (p, "-Wno-missing-prototypes"))
650 warn_missing_prototypes = 0;
651 else if (!strcmp (p, "-Wmissing-declarations"))
652 warn_missing_declarations = 1;
653 else if (!strcmp (p, "-Wno-missing-declarations"))
654 warn_missing_declarations = 0;
655 else if (!strcmp (p, "-Wredundant-decls"))
656 warn_redundant_decls = 1;
657 else if (!strcmp (p, "-Wno-redundant-decls"))
658 warn_redundant_decls = 0;
659 else if (!strcmp (p, "-Wnested-externs"))
660 warn_nested_externs = 1;
661 else if (!strcmp (p, "-Wno-nested-externs"))
662 warn_nested_externs = 0;
663 else if (!strcmp (p, "-Wtraditional"))
664 warn_traditional = 1;
665 else if (!strcmp (p, "-Wno-traditional"))
666 warn_traditional = 0;
667 else if (!strcmp (p, "-Wformat"))
669 else if (!strcmp (p, "-Wno-format"))
671 else if (!strcmp (p, "-Wchar-subscripts"))
672 warn_char_subscripts = 1;
673 else if (!strcmp (p, "-Wno-char-subscripts"))
674 warn_char_subscripts = 0;
675 else if (!strcmp (p, "-Wconversion"))
677 else if (!strcmp (p, "-Wno-conversion"))
679 else if (!strcmp (p, "-Wparentheses"))
680 warn_parentheses = 1;
681 else if (!strcmp (p, "-Wno-parentheses"))
682 warn_parentheses = 0;
683 else if (!strcmp (p, "-Wreturn-type"))
684 warn_return_type = 1;
685 else if (!strcmp (p, "-Wno-return-type"))
686 warn_return_type = 0;
687 else if (!strcmp (p, "-Wcomment"))
688 ; /* cpp handles this one. */
689 else if (!strcmp (p, "-Wno-comment"))
690 ; /* cpp handles this one. */
691 else if (!strcmp (p, "-Wcomments"))
692 ; /* cpp handles this one. */
693 else if (!strcmp (p, "-Wno-comments"))
694 ; /* cpp handles this one. */
695 else if (!strcmp (p, "-Wtrigraphs"))
696 ; /* cpp handles this one. */
697 else if (!strcmp (p, "-Wno-trigraphs"))
698 ; /* cpp handles this one. */
699 else if (!strcmp (p, "-Wundef"))
700 ; /* cpp handles this one. */
701 else if (!strcmp (p, "-Wno-undef"))
702 ; /* cpp handles this one. */
703 else if (!strcmp (p, "-Wimport"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p, "-Wno-import"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p, "-Wmissing-braces"))
708 warn_missing_braces = 1;
709 else if (!strcmp (p, "-Wno-missing-braces"))
710 warn_missing_braces = 0;
711 else if (!strcmp (p, "-Wmain"))
713 else if (!strcmp (p, "-Wno-main"))
715 else if (!strcmp (p, "-Wsign-compare"))
716 warn_sign_compare = 1;
717 else if (!strcmp (p, "-Wno-sign-compare"))
718 warn_sign_compare = 0;
719 else if (!strcmp (p, "-Wmultichar"))
721 else if (!strcmp (p, "-Wno-multichar"))
723 else if (!strcmp (p, "-Wunknown-pragmas"))
724 /* Set to greater than 1, so that even unknown pragmas in system
725 headers will be warned about. */
726 warn_unknown_pragmas = 2;
727 else if (!strcmp (p, "-Wno-unknown-pragmas"))
728 warn_unknown_pragmas = 0;
729 else if (!strcmp (p, "-Wall"))
731 /* We save the value of warn_uninitialized, since if they put
732 -Wuninitialized on the command line, we need to generate a
733 warning about not using it without also specifying -O. */
734 if (warn_uninitialized != 1)
735 warn_uninitialized = 2;
736 warn_implicit_int = 1;
737 mesg_implicit_function_declaration = 1;
738 warn_return_type = 1;
742 warn_char_subscripts = 1;
743 warn_parentheses = 1;
744 warn_missing_braces = 1;
745 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
746 it off only if it's not explicit. */
748 /* Only warn about unknown pragmas that are not in system headers. */
749 warn_unknown_pragmas = 1;
752 return strings_processed;
757 /* Hooks for print_node. */
760 print_lang_decl (file, node, indent)
761 FILE *file ATTRIBUTE_UNUSED;
762 tree node ATTRIBUTE_UNUSED;
763 int indent ATTRIBUTE_UNUSED;
768 print_lang_type (file, node, indent)
769 FILE *file ATTRIBUTE_UNUSED;
770 tree node ATTRIBUTE_UNUSED;
771 int indent ATTRIBUTE_UNUSED;
776 print_lang_identifier (file, node, indent)
781 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
782 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
783 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
784 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
785 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
786 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
789 /* Hook called at end of compilation to assume 1 elt
790 for a top-level array decl that wasn't complete before. */
793 finish_incomplete_decl (decl)
796 if (TREE_CODE (decl) == VAR_DECL)
798 tree type = TREE_TYPE (decl);
799 if (type != error_mark_node
800 && TREE_CODE (type) == ARRAY_TYPE
801 && TYPE_DOMAIN (type) == 0)
803 if (! DECL_EXTERNAL (decl))
804 warning_with_decl (decl, "array `%s' assumed to have one element");
806 complete_array_type (type, NULL_TREE, 1);
808 layout_decl (decl, 0);
813 /* Create a new `struct binding_level'. */
816 struct binding_level *
817 make_binding_level ()
820 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
823 /* Nonzero if we are currently in the global binding level. */
828 return current_binding_level == global_binding_level;
834 keep_next_level_flag = 1;
837 /* Nonzero if the current level needs to have a BLOCK made. */
842 return ((current_binding_level->keep_if_subblocks
843 && current_binding_level->blocks != 0)
844 || current_binding_level->keep
845 || current_binding_level->names != 0
846 || (current_binding_level->tags != 0
847 && !current_binding_level->tag_transparent));
850 /* Identify this binding level as a level of parameters.
851 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
852 But it turns out there is no way to pass the right value for
853 DEFINITION_FLAG, so we ignore it. */
856 declare_parm_level (definition_flag)
857 int definition_flag ATTRIBUTE_UNUSED;
859 current_binding_level->parm_flag = 1;
862 /* Nonzero if currently making parm declarations. */
867 return current_binding_level->parm_flag;
870 /* Enter a new binding level.
871 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
872 not for that of tags. */
875 pushlevel (tag_transparent)
878 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
880 /* If this is the top level of a function,
881 just make sure that NAMED_LABELS is 0. */
883 if (current_binding_level == global_binding_level)
888 /* Reuse or create a struct for this binding level. */
890 if (free_binding_level)
892 newlevel = free_binding_level;
893 free_binding_level = free_binding_level->level_chain;
897 newlevel = make_binding_level ();
900 /* Add this level to the front of the chain (stack) of levels that
903 *newlevel = clear_binding_level;
904 newlevel->tag_transparent
906 || (current_binding_level
907 ? current_binding_level->subblocks_tag_transparent
909 newlevel->level_chain = current_binding_level;
910 current_binding_level = newlevel;
911 newlevel->keep = keep_next_level_flag;
912 keep_next_level_flag = 0;
913 newlevel->keep_if_subblocks = keep_next_if_subblocks;
914 keep_next_if_subblocks = 0;
917 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
920 clear_limbo_values (block)
925 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
926 if (DECL_NAME (tem) != 0)
927 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
929 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
930 clear_limbo_values (tem);
933 /* Exit a binding level.
934 Pop the level off, and restore the state of the identifier-decl mappings
935 that were in effect when this level was entered.
937 If KEEP is nonzero, this level had explicit declarations, so
938 and create a "block" (a BLOCK node) for the level
939 to record its declarations and subblocks for symbol table output.
941 If FUNCTIONBODY is nonzero, this level is the body of a function,
942 so create a block as if KEEP were set and also clear out all
945 If REVERSE is nonzero, reverse the order of decls before putting
946 them into the BLOCK. */
949 poplevel (keep, reverse, functionbody)
955 /* The chain of decls was accumulated in reverse order.
956 Put it into forward order, just for cleanliness. */
958 tree tags = current_binding_level->tags;
959 tree subblocks = current_binding_level->blocks;
962 int block_previously_created;
964 keep |= current_binding_level->keep;
966 /* This warning is turned off because it causes warnings for
967 declarations like `extern struct foo *x'. */
969 /* Warn about incomplete structure types in this level. */
970 for (link = tags; link; link = TREE_CHAIN (link))
971 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
973 tree type = TREE_VALUE (link);
974 tree type_name = TYPE_NAME (type);
975 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
977 : DECL_NAME (type_name));
978 switch (TREE_CODE (type))
981 error ("`struct %s' incomplete in scope ending here", id);
984 error ("`union %s' incomplete in scope ending here", id);
987 error ("`enum %s' incomplete in scope ending here", id);
993 /* Get the decls in the order they were written.
994 Usually current_binding_level->names is in reverse order.
995 But parameter decls were previously put in forward order. */
998 current_binding_level->names
999 = decls = nreverse (current_binding_level->names);
1001 decls = current_binding_level->names;
1003 /* Output any nested inline functions within this block
1004 if they weren't already output. */
1006 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1007 if (TREE_CODE (decl) == FUNCTION_DECL
1008 && ! TREE_ASM_WRITTEN (decl)
1009 && DECL_INITIAL (decl) != 0
1010 && TREE_ADDRESSABLE (decl))
1012 /* If this decl was copied from a file-scope decl
1013 on account of a block-scope extern decl,
1014 propagate TREE_ADDRESSABLE to the file-scope decl.
1016 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1017 true, since then the decl goes through save_for_inline_copying. */
1018 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1019 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1020 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1021 else if (DECL_SAVED_INSNS (decl) != 0)
1023 push_function_context ();
1024 output_inline_function (decl);
1025 pop_function_context ();
1029 /* If there were any declarations or structure tags in that level,
1030 or if this level is a function body,
1031 create a BLOCK to record them for the life of this function. */
1034 block_previously_created = (current_binding_level->this_block != 0);
1035 if (block_previously_created)
1036 block = current_binding_level->this_block;
1037 else if (keep || functionbody
1038 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1039 block = make_node (BLOCK);
1042 BLOCK_VARS (block) = decls;
1043 BLOCK_TYPE_TAGS (block) = tags;
1044 BLOCK_SUBBLOCKS (block) = subblocks;
1045 remember_end_note (block);
1048 /* In each subblock, record that this is its superior. */
1050 for (link = subblocks; link; link = TREE_CHAIN (link))
1051 BLOCK_SUPERCONTEXT (link) = block;
1053 /* Clear out the meanings of the local variables of this level. */
1055 for (link = decls; link; link = TREE_CHAIN (link))
1057 if (DECL_NAME (link) != 0)
1059 /* If the ident. was used or addressed via a local extern decl,
1060 don't forget that fact. */
1061 if (DECL_EXTERNAL (link))
1063 if (TREE_USED (link))
1064 TREE_USED (DECL_NAME (link)) = 1;
1065 if (TREE_ADDRESSABLE (link))
1066 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1068 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1072 /* Restore all name-meanings of the outer levels
1073 that were shadowed by this level. */
1075 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1076 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1078 /* If the level being exited is the top level of a function,
1079 check over all the labels, and clear out the current
1080 (function local) meanings of their names. */
1084 clear_limbo_values (block);
1086 /* If this is the top level block of a function,
1087 the vars are the function's parameters.
1088 Don't leave them in the BLOCK because they are
1089 found in the FUNCTION_DECL instead. */
1091 BLOCK_VARS (block) = 0;
1093 /* Clear out the definitions of all label names,
1094 since their scopes end here,
1095 and add them to BLOCK_VARS. */
1097 for (link = named_labels; link; link = TREE_CHAIN (link))
1099 register tree label = TREE_VALUE (link);
1101 if (DECL_INITIAL (label) == 0)
1103 error_with_decl (label, "label `%s' used but not defined");
1104 /* Avoid crashing later. */
1105 define_label (input_filename, lineno,
1108 else if (warn_unused && !TREE_USED (label))
1109 warning_with_decl (label, "label `%s' defined but not used");
1110 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1112 /* Put the labels into the "variables" of the
1113 top-level block, so debugger can see them. */
1114 TREE_CHAIN (label) = BLOCK_VARS (block);
1115 BLOCK_VARS (block) = label;
1119 /* Pop the current level, and free the structure for reuse. */
1122 register struct binding_level *level = current_binding_level;
1123 current_binding_level = current_binding_level->level_chain;
1125 level->level_chain = free_binding_level;
1126 free_binding_level = level;
1129 /* Dispose of the block that we just made inside some higher level. */
1131 DECL_INITIAL (current_function_decl) = block;
1134 if (!block_previously_created)
1135 current_binding_level->blocks
1136 = chainon (current_binding_level->blocks, block);
1138 /* If we did not make a block for the level just exited,
1139 any blocks made for inner levels
1140 (since they cannot be recorded as subblocks in that level)
1141 must be carried forward so they will later become subblocks
1142 of something else. */
1144 current_binding_level->blocks
1145 = chainon (current_binding_level->blocks, subblocks);
1147 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1148 binding contour so that they point to the appropriate construct, i.e.
1149 either to the current FUNCTION_DECL node, or else to the BLOCK node
1150 we just constructed.
1152 Note that for tagged types whose scope is just the formal parameter
1153 list for some function type specification, we can't properly set
1154 their TYPE_CONTEXTs here, because we don't have a pointer to the
1155 appropriate FUNCTION_TYPE node readily available to us. For those
1156 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1157 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1158 node which will represent the "scope" for these "parameter list local"
1163 for (link = tags; link; link = TREE_CHAIN (link))
1164 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1166 for (link = tags; link; link = TREE_CHAIN (link))
1167 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1170 TREE_USED (block) = 1;
1174 /* Delete the node BLOCK from the current binding level.
1175 This is used for the block inside a stmt expr ({...})
1176 so that the block can be reinserted where appropriate. */
1179 delete_block (block)
1183 if (current_binding_level->blocks == block)
1184 current_binding_level->blocks = TREE_CHAIN (block);
1185 for (t = current_binding_level->blocks; t;)
1187 if (TREE_CHAIN (t) == block)
1188 TREE_CHAIN (t) = TREE_CHAIN (block);
1192 TREE_CHAIN (block) = NULL;
1193 /* Clear TREE_USED which is always set by poplevel.
1194 The flag is set again if insert_block is called. */
1195 TREE_USED (block) = 0;
1198 /* Insert BLOCK at the end of the list of subblocks of the
1199 current binding level. This is used when a BIND_EXPR is expanded,
1200 to handle the BLOCK node inside the BIND_EXPR. */
1203 insert_block (block)
1206 TREE_USED (block) = 1;
1207 current_binding_level->blocks
1208 = chainon (current_binding_level->blocks, block);
1211 /* Set the BLOCK node for the innermost scope
1212 (the one we are currently in). */
1216 register tree block;
1218 current_binding_level->this_block = block;
1224 register struct binding_level *newlevel;
1226 /* Reuse or create a struct for this binding level. */
1228 if (free_binding_level)
1230 newlevel = free_binding_level;
1231 free_binding_level = free_binding_level->level_chain;
1235 newlevel = make_binding_level ();
1238 /* Add this level to the front of the chain (stack) of label levels. */
1240 newlevel->level_chain = label_level_chain;
1241 label_level_chain = newlevel;
1243 newlevel->names = named_labels;
1244 newlevel->shadowed = shadowed_labels;
1246 shadowed_labels = 0;
1252 register struct binding_level *level = label_level_chain;
1255 /* Clear out the definitions of the declared labels in this level.
1256 Leave in the list any ordinary, non-declared labels. */
1257 for (link = named_labels, prev = 0; link;)
1259 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1261 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1263 error_with_decl (TREE_VALUE (link),
1264 "label `%s' used but not defined");
1265 /* Avoid crashing later. */
1266 define_label (input_filename, lineno,
1267 DECL_NAME (TREE_VALUE (link)));
1269 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1270 warning_with_decl (TREE_VALUE (link),
1271 "label `%s' defined but not used");
1272 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1274 /* Delete this element from the list. */
1275 link = TREE_CHAIN (link);
1277 TREE_CHAIN (prev) = link;
1279 named_labels = link;
1284 link = TREE_CHAIN (link);
1288 /* Bring back all the labels that were shadowed. */
1289 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1290 if (DECL_NAME (TREE_VALUE (link)) != 0)
1291 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1292 = TREE_VALUE (link);
1294 named_labels = chainon (named_labels, level->names);
1295 shadowed_labels = level->shadowed;
1297 /* Pop the current level, and free the structure for reuse. */
1298 label_level_chain = label_level_chain->level_chain;
1299 level->level_chain = free_binding_level;
1300 free_binding_level = level;
1303 /* Push a definition or a declaration of struct, union or enum tag "name".
1304 "type" should be the type node.
1305 We assume that the tag "name" is not already defined.
1307 Note that the definition may really be just a forward reference.
1308 In that case, the TYPE_SIZE will be zero. */
1311 pushtag (name, type)
1314 register struct binding_level *b;
1316 /* Find the proper binding level for this type tag. */
1318 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1323 /* Record the identifier as the type's name if it has none. */
1325 if (TYPE_NAME (type) == 0)
1326 TYPE_NAME (type) = name;
1329 if (b == global_binding_level)
1330 b->tags = perm_tree_cons (name, type, b->tags);
1332 b->tags = saveable_tree_cons (name, type, b->tags);
1334 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1335 tagged type we just added to the current binding level. This fake
1336 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1337 to output a representation of a tagged type, and it also gives
1338 us a convenient place to record the "scope start" address for the
1341 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1343 /* An approximation for now, so we can tell this is a function-scope tag.
1344 This will be updated in poplevel. */
1345 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1348 /* Handle when a new declaration NEWDECL
1349 has the same name as an old one OLDDECL
1350 in the same binding contour.
1351 Prints an error message if appropriate.
1353 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1354 Otherwise, return 0.
1356 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1357 and OLDDECL is in an outer binding level and should thus not be changed. */
1360 duplicate_decls (newdecl, olddecl, different_binding_level)
1361 register tree newdecl, olddecl;
1362 int different_binding_level;
1364 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1365 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1366 && DECL_INITIAL (newdecl) != 0);
1367 tree oldtype = TREE_TYPE (olddecl);
1368 tree newtype = TREE_TYPE (newdecl);
1371 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1372 DECL_MACHINE_ATTRIBUTES (newdecl)
1373 = merge_machine_decl_attributes (olddecl, newdecl);
1375 if (TREE_CODE (newtype) == ERROR_MARK
1376 || TREE_CODE (oldtype) == ERROR_MARK)
1379 /* New decl is completely inconsistent with the old one =>
1380 tell caller to replace the old one.
1381 This is always an error except in the case of shadowing a builtin. */
1382 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1384 if (TREE_CODE (olddecl) == FUNCTION_DECL
1385 && (DECL_BUILT_IN (olddecl)
1386 || DECL_BUILT_IN_NONANSI (olddecl)))
1388 /* If you declare a built-in or predefined function name as static,
1389 the old definition is overridden,
1390 but optionally warn this was a bad choice of name. */
1391 if (!TREE_PUBLIC (newdecl))
1395 else if (DECL_BUILT_IN (olddecl))
1396 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1398 warning_with_decl (newdecl, "shadowing library function `%s'");
1400 /* Likewise, if the built-in is not ansi, then programs can
1401 override it even globally without an error. */
1402 else if (! DECL_BUILT_IN (olddecl))
1403 warning_with_decl (newdecl,
1404 "library function `%s' declared as non-function");
1406 else if (DECL_BUILT_IN_NONANSI (olddecl))
1407 warning_with_decl (newdecl,
1408 "built-in function `%s' declared as non-function");
1410 warning_with_decl (newdecl,
1411 "built-in function `%s' declared as non-function");
1415 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1416 error_with_decl (olddecl, "previous declaration of `%s'");
1422 /* For real parm decl following a forward decl,
1423 return 1 so old decl will be reused. */
1424 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1425 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1428 /* The new declaration is the same kind of object as the old one.
1429 The declarations may partially match. Print warnings if they don't
1430 match enough. Ultimately, copy most of the information from the new
1431 decl to the old one, and keep using the old one. */
1433 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1434 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1435 && DECL_INITIAL (olddecl) == 0)
1436 /* If -traditional, avoid error for redeclaring fcn
1437 after implicit decl. */
1439 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1440 && DECL_BUILT_IN (olddecl))
1442 /* A function declaration for a built-in function. */
1443 if (!TREE_PUBLIC (newdecl))
1445 /* If you declare a built-in function name as static, the
1446 built-in definition is overridden,
1447 but optionally warn this was a bad choice of name. */
1449 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1450 /* Discard the old built-in function. */
1453 else if (!types_match)
1455 /* Accept the return type of the new declaration if same modes. */
1456 tree oldreturntype = TREE_TYPE (oldtype);
1457 tree newreturntype = TREE_TYPE (newtype);
1459 /* Make sure we put the new type in the same obstack as the old ones.
1460 If the old types are not both in the same obstack, use the
1462 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1463 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1466 push_obstacks_nochange ();
1467 end_temporary_allocation ();
1470 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1472 /* Function types may be shared, so we can't just modify
1473 the return type of olddecl's function type. */
1475 = build_function_type (newreturntype,
1476 TYPE_ARG_TYPES (oldtype));
1478 types_match = comptypes (newtype, trytype);
1482 /* Accept harmless mismatch in first argument type also.
1484 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1485 && TYPE_ARG_TYPES (oldtype) != 0
1486 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1487 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1488 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1489 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1491 /* Function types may be shared, so we can't just modify
1492 the return type of olddecl's function type. */
1494 = build_function_type (TREE_TYPE (oldtype),
1495 tree_cons (NULL_TREE,
1496 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1497 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1499 types_match = comptypes (newtype, trytype);
1503 if (! different_binding_level)
1504 TREE_TYPE (olddecl) = oldtype;
1510 /* If types don't match for a built-in, throw away the built-in. */
1511 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1515 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1516 && DECL_SOURCE_LINE (olddecl) == 0)
1518 /* A function declaration for a predeclared function
1519 that isn't actually built in. */
1520 if (!TREE_PUBLIC (newdecl))
1522 /* If you declare it as static, the
1523 default definition is overridden. */
1526 else if (!types_match)
1528 /* If the types don't match, preserve volatility indication.
1529 Later on, we will discard everything else about the
1530 default declaration. */
1531 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1534 /* Permit char *foo () to match void *foo (...) if not pedantic,
1535 if one of them came from a system header file. */
1536 else if (!types_match
1537 && TREE_CODE (olddecl) == FUNCTION_DECL
1538 && TREE_CODE (newdecl) == FUNCTION_DECL
1539 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1540 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1541 && (DECL_IN_SYSTEM_HEADER (olddecl)
1542 || DECL_IN_SYSTEM_HEADER (newdecl))
1543 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1544 && TYPE_ARG_TYPES (oldtype) == 0
1545 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1546 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1548 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1549 && TYPE_ARG_TYPES (newtype) == 0
1550 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1551 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1554 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1555 /* Make sure we keep void * as ret type, not char *. */
1556 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1557 TREE_TYPE (newdecl) = newtype = oldtype;
1559 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1560 we will come back here again. */
1561 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1563 else if (!types_match
1564 /* Permit char *foo (int, ...); followed by char *foo ();
1566 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1568 /* Return types must still match. */
1569 && comptypes (TREE_TYPE (oldtype),
1570 TREE_TYPE (newtype))
1571 && TYPE_ARG_TYPES (newtype) == 0))
1573 error_with_decl (newdecl, "conflicting types for `%s'");
1574 /* Check for function type mismatch
1575 involving an empty arglist vs a nonempty one. */
1576 if (TREE_CODE (olddecl) == FUNCTION_DECL
1577 && comptypes (TREE_TYPE (oldtype),
1578 TREE_TYPE (newtype))
1579 && ((TYPE_ARG_TYPES (oldtype) == 0
1580 && DECL_INITIAL (olddecl) == 0)
1582 (TYPE_ARG_TYPES (newtype) == 0
1583 && DECL_INITIAL (newdecl) == 0)))
1585 /* Classify the problem further. */
1586 register tree t = TYPE_ARG_TYPES (oldtype);
1588 t = TYPE_ARG_TYPES (newtype);
1589 for (; t; t = TREE_CHAIN (t))
1591 register tree type = TREE_VALUE (t);
1593 if (TREE_CHAIN (t) == 0
1594 && TYPE_MAIN_VARIANT (type) != void_type_node)
1596 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1600 if (simple_type_promotes_to (type) != NULL_TREE)
1602 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1607 error_with_decl (olddecl, "previous declaration of `%s'");
1611 errmsg = redeclaration_error_message (newdecl, olddecl);
1617 error_with_decl (newdecl, "redefinition of `%s'");
1620 error_with_decl (newdecl, "redeclaration of `%s'");
1623 error_with_decl (newdecl, "conflicting declarations of `%s'");
1629 error_with_decl (olddecl,
1630 ((DECL_INITIAL (olddecl)
1631 && current_binding_level == global_binding_level)
1632 ? "`%s' previously defined here"
1633 : "`%s' previously declared here"));
1635 else if (TREE_CODE (newdecl) == TYPE_DECL
1636 && (DECL_IN_SYSTEM_HEADER (olddecl)
1637 || DECL_IN_SYSTEM_HEADER (newdecl)))
1639 warning_with_decl (newdecl, "redefinition of `%s'");
1642 ((DECL_INITIAL (olddecl)
1643 && current_binding_level == global_binding_level)
1644 ? "`%s' previously defined here"
1645 : "`%s' previously declared here"));
1647 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1648 && DECL_INITIAL (olddecl) != 0
1649 && TYPE_ARG_TYPES (oldtype) == 0
1650 && TYPE_ARG_TYPES (newtype) != 0
1651 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1653 register tree type, parm;
1655 /* Prototype decl follows defn w/o prototype. */
1657 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1658 type = TYPE_ARG_TYPES (newtype),
1661 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1663 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1664 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1666 warning_with_decl (newdecl, "prototype for `%s' follows");
1667 warning_with_decl (olddecl, "non-prototype definition here");
1670 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1671 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1673 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1674 error_with_decl (olddecl, "non-prototype definition here");
1678 /* Type for passing arg must be consistent
1679 with that declared for the arg. */
1680 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1681 /* If -traditional, allow `unsigned int' instead of `int'
1682 in the prototype. */
1683 && (! (flag_traditional
1684 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1685 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1687 error_with_decl (newdecl,
1688 "prototype for `%s' follows and argument %d doesn't match",
1690 error_with_decl (olddecl, "non-prototype definition here");
1696 /* Warn about mismatches in various flags. */
1699 /* Warn if function is now inline
1700 but was previously declared not inline and has been called. */
1701 if (TREE_CODE (olddecl) == FUNCTION_DECL
1702 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1703 && TREE_USED (olddecl))
1704 warning_with_decl (newdecl,
1705 "`%s' declared inline after being called");
1706 if (TREE_CODE (olddecl) == FUNCTION_DECL
1707 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1708 && DECL_INITIAL (olddecl) != 0)
1709 warning_with_decl (newdecl,
1710 "`%s' declared inline after its definition");
1712 /* If pedantic, warn when static declaration follows a non-static
1713 declaration. Otherwise, do so only for functions. */
1714 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1715 && TREE_PUBLIC (olddecl)
1716 && !TREE_PUBLIC (newdecl))
1717 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1719 /* If warn_traditional, warn when a non-static function
1720 declaration follows a static one. */
1721 if (warn_traditional
1722 && TREE_CODE (olddecl) == FUNCTION_DECL
1723 && !TREE_PUBLIC (olddecl)
1724 && TREE_PUBLIC (newdecl))
1725 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1727 /* Warn when const declaration follows a non-const
1728 declaration, but not for functions. */
1729 if (TREE_CODE (olddecl) != FUNCTION_DECL
1730 && !TREE_READONLY (olddecl)
1731 && TREE_READONLY (newdecl))
1732 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1733 /* These bits are logically part of the type, for variables.
1734 But not for functions
1735 (where qualifiers are not valid ANSI anyway). */
1736 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1737 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1738 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1739 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1743 /* Optionally warn about more than one declaration for the same name. */
1744 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1745 /* Don't warn about a function declaration
1746 followed by a definition. */
1747 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1748 && DECL_INITIAL (olddecl) == 0)
1749 /* Don't warn about extern decl followed by (tentative) definition. */
1750 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1752 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1753 warning_with_decl (olddecl, "previous declaration of `%s'");
1756 /* Copy all the DECL_... slots specified in the new decl
1757 except for any that we copy here from the old type.
1759 Past this point, we don't change OLDTYPE and NEWTYPE
1760 even if we change the types of NEWDECL and OLDDECL. */
1764 /* When copying info to olddecl, we store into write_olddecl
1765 instead. This allows us to avoid modifying olddecl when
1766 different_binding_level is true. */
1767 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1769 /* Make sure we put the new type in the same obstack as the old ones.
1770 If the old types are not both in the same obstack, use the permanent
1772 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1773 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1776 push_obstacks_nochange ();
1777 end_temporary_allocation ();
1780 /* Merge the data types specified in the two decls. */
1781 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1783 if (different_binding_level)
1785 = build_type_attribute_variant
1787 merge_attributes (TYPE_ATTRIBUTES (newtype),
1788 TYPE_ATTRIBUTES (oldtype)));
1791 = TREE_TYPE (olddecl)
1792 = common_type (newtype, oldtype);
1795 /* Lay the type out, unless already done. */
1796 if (oldtype != TREE_TYPE (newdecl))
1798 if (TREE_TYPE (newdecl) != error_mark_node)
1799 layout_type (TREE_TYPE (newdecl));
1800 if (TREE_CODE (newdecl) != FUNCTION_DECL
1801 && TREE_CODE (newdecl) != TYPE_DECL
1802 && TREE_CODE (newdecl) != CONST_DECL)
1803 layout_decl (newdecl, 0);
1807 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1808 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1809 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1810 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1811 DECL_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 (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1819 && !TREE_THIS_VOLATILE (newdecl))
1820 TREE_THIS_VOLATILE (write_olddecl) = 0;
1821 if (TREE_READONLY (newdecl))
1822 TREE_READONLY (write_olddecl) = 1;
1823 if (TREE_THIS_VOLATILE (newdecl))
1825 TREE_THIS_VOLATILE (write_olddecl) = 1;
1826 if (TREE_CODE (newdecl) == VAR_DECL)
1827 make_var_volatile (newdecl);
1830 /* Keep source location of definition rather than declaration. */
1831 /* When called with different_binding_level set, keep the old
1832 information so that meaningful diagnostics can be given. */
1833 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1834 && ! different_binding_level)
1836 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1837 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1840 /* Merge the unused-warning information. */
1841 if (DECL_IN_SYSTEM_HEADER (olddecl))
1842 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1843 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1844 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1846 /* Merge the initialization information. */
1847 /* When called with different_binding_level set, don't copy over
1848 DECL_INITIAL, so that we don't accidentally change function
1849 declarations into function definitions. */
1850 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1851 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1853 /* Merge the section attribute.
1854 We want to issue an error if the sections conflict but that must be
1855 done later in decl_attributes since we are called before attributes
1857 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1858 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1860 /* Copy the assembler name.
1861 Currently, it can only be defined in the prototype. */
1862 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1864 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1866 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1867 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1869 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1870 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1871 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1872 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1877 /* If cannot merge, then use the new type and qualifiers,
1878 and don't preserve the old rtl. */
1879 else if (! different_binding_level)
1881 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1882 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1883 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1884 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1887 /* Merge the storage class information. */
1888 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1889 /* For functions, static overrides non-static. */
1890 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1892 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1893 /* This is since we don't automatically
1894 copy the attributes of NEWDECL into OLDDECL. */
1895 /* No need to worry about different_binding_level here because
1896 then TREE_PUBLIC (newdecl) was true. */
1897 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1898 /* If this clears `static', clear it in the identifier too. */
1899 if (! TREE_PUBLIC (olddecl))
1900 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1902 if (DECL_EXTERNAL (newdecl))
1904 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1905 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1906 /* An extern decl does not override previous storage class. */
1907 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1908 if (! DECL_EXTERNAL (newdecl))
1909 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1913 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1914 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1917 /* If either decl says `inline', this fn is inline,
1918 unless its definition was passed already. */
1919 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1920 DECL_INLINE (olddecl) = 1;
1921 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1923 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1925 if (DECL_BUILT_IN (olddecl))
1927 /* Get rid of any built-in function if new arg types don't match it
1928 or if we have a function definition. */
1929 if (! types_match || new_is_definition)
1931 if (! different_binding_level)
1933 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1934 DECL_BUILT_IN (olddecl) = 0;
1939 /* If redeclaring a builtin function, and not a definition,
1940 it stays built in. */
1941 DECL_BUILT_IN (newdecl) = 1;
1942 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1945 /* Also preserve various other info from the definition. */
1946 else if (! new_is_definition)
1947 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1948 if (! new_is_definition)
1950 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1951 /* When called with different_binding_level set, don't copy over
1952 DECL_INITIAL, so that we don't accidentally change function
1953 declarations into function definitions. */
1954 if (! different_binding_level)
1955 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1956 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1957 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1958 if (DECL_INLINE (newdecl))
1959 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
1962 if (different_binding_level)
1964 /* Don't output a duplicate symbol or debugging information for this
1967 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
1968 just have two declarations without a definition. VAR_DECLs may need
1969 the same treatment, I'm not sure. */
1970 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1971 DECL_IGNORED_P (newdecl) = 1;
1973 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1977 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1978 But preserve OLDDECL's DECL_UID. */
1980 register unsigned olddecl_uid = DECL_UID (olddecl);
1982 bcopy ((char *) newdecl + sizeof (struct tree_common),
1983 (char *) olddecl + sizeof (struct tree_common),
1984 sizeof (struct tree_decl) - sizeof (struct tree_common));
1985 DECL_UID (olddecl) = olddecl_uid;
1988 /* NEWDECL contains the merged attribute lists.
1989 Update OLDDECL to be the same. */
1990 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
1995 /* Record a decl-node X as belonging to the current lexical scope.
1996 Check for errors (such as an incompatible declaration for the same
1997 name already seen in the same scope).
1999 Returns either X or an old decl for the same name.
2000 If an old decl is returned, it may have been smashed
2001 to agree with what X says. */
2008 register tree name = DECL_NAME (x);
2009 register struct binding_level *b = current_binding_level;
2011 DECL_CONTEXT (x) = current_function_decl;
2012 /* A local extern declaration for a function doesn't constitute nesting.
2013 A local auto declaration does, since it's a forward decl
2014 for a nested function coming later. */
2015 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2016 && DECL_EXTERNAL (x))
2017 DECL_CONTEXT (x) = 0;
2019 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2020 && x != IDENTIFIER_IMPLICIT_DECL (name)
2021 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2022 && !DECL_IN_SYSTEM_HEADER (x))
2023 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2029 int different_binding_level = 0;
2031 t = lookup_name_current_level (name);
2032 /* Don't type check externs here when -traditional. This is so that
2033 code with conflicting declarations inside blocks will get warnings
2034 not errors. X11 for instance depends on this. */
2035 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2037 t = IDENTIFIER_GLOBAL_VALUE (name);
2038 /* Type decls at global scope don't conflict with externs declared
2039 inside lexical blocks. */
2040 if (t && TREE_CODE (t) == TYPE_DECL)
2042 different_binding_level = 1;
2044 if (t != 0 && t == error_mark_node)
2045 /* error_mark_node is 0 for a while during initialization! */
2048 error_with_decl (x, "`%s' used prior to declaration");
2053 file = DECL_SOURCE_FILE (t);
2054 line = DECL_SOURCE_LINE (t);
2057 /* If this decl is `static' and an implicit decl was seen previously,
2058 warn. But don't complain if -traditional,
2059 since traditional compilers don't complain. */
2060 if (! flag_traditional && TREE_PUBLIC (name)
2061 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2062 sets this for all functions. */
2063 && ! TREE_PUBLIC (x)
2064 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2065 /* We used to warn also for explicit extern followed by static,
2066 but sometimes you need to do it that way. */
2067 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2069 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2070 IDENTIFIER_POINTER (name));
2071 pedwarn_with_file_and_line
2072 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2073 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2074 "previous declaration of `%s'",
2075 IDENTIFIER_POINTER (name));
2076 TREE_THIS_VOLATILE (name) = 1;
2079 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2081 if (TREE_CODE (t) == PARM_DECL)
2083 /* Don't allow more than one "real" duplicate
2084 of a forward parm decl. */
2085 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2091 /* If we are processing a typedef statement, generate a whole new
2092 ..._TYPE node (which will be just an variant of the existing
2093 ..._TYPE node with identical properties) and then install the
2094 TYPE_DECL node generated to represent the typedef name as the
2095 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2097 The whole point here is to end up with a situation where each
2098 and every ..._TYPE node the compiler creates will be uniquely
2099 associated with AT MOST one node representing a typedef name.
2100 This way, even though the compiler substitutes corresponding
2101 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2102 early on, later parts of the compiler can always do the reverse
2103 translation and get back the corresponding typedef name. For
2106 typedef struct S MY_TYPE;
2109 Later parts of the compiler might only know that `object' was of
2110 type `struct S' if it were not for code just below. With this
2111 code however, later parts of the compiler see something like:
2113 struct S' == struct S
2114 typedef struct S' MY_TYPE;
2117 And they can then deduce (from the node for type struct S') that
2118 the original object declaration was:
2122 Being able to do this is important for proper support of protoize,
2123 and also for generating precise symbolic debugging information
2124 which takes full account of the programmer's (typedef) vocabulary.
2126 Obviously, we don't want to generate a duplicate ..._TYPE node if
2127 the TYPE_DECL node that we are now processing really represents a
2128 standard built-in type.
2130 Since all standard types are effectively declared at line zero
2131 in the source file, we can easily check to see if we are working
2132 on a standard type by checking the current value of lineno. */
2134 if (TREE_CODE (x) == TYPE_DECL)
2136 if (DECL_SOURCE_LINE (x) == 0)
2138 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2139 TYPE_NAME (TREE_TYPE (x)) = x;
2141 else if (TREE_TYPE (x) != error_mark_node
2142 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2144 tree tt = TREE_TYPE (x);
2145 DECL_ORIGINAL_TYPE (x) = tt;
2146 tt = build_type_copy (tt);
2152 /* Multiple external decls of the same identifier ought to match.
2153 Check against both global declarations (when traditional) and out of
2154 scope (limbo) block level declarations.
2156 We get warnings about inline functions where they are defined.
2157 Avoid duplicate warnings where they are used. */
2158 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2162 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2163 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2164 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2165 decl = IDENTIFIER_GLOBAL_VALUE (name);
2166 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2167 /* Decls in limbo are always extern, so no need to check that. */
2168 decl = IDENTIFIER_LIMBO_VALUE (name);
2172 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2173 /* If old decl is built-in, we already warned if we should. */
2174 && !DECL_BUILT_IN (decl))
2176 pedwarn_with_decl (x,
2177 "type mismatch with previous external decl");
2178 pedwarn_with_decl (decl, "previous external decl of `%s'");
2182 /* If a function has had an implicit declaration, and then is defined,
2183 make sure they are compatible. */
2185 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2186 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2187 && TREE_CODE (x) == FUNCTION_DECL
2188 && ! comptypes (TREE_TYPE (x),
2189 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2191 warning_with_decl (x, "type mismatch with previous implicit declaration");
2192 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2193 "previous implicit declaration of `%s'");
2196 /* In PCC-compatibility mode, extern decls of vars with no current decl
2197 take effect at top level no matter where they are. */
2198 if (flag_traditional && DECL_EXTERNAL (x)
2199 && lookup_name (name) == 0)
2201 tree type = TREE_TYPE (x);
2203 /* But don't do this if the type contains temporary nodes. */
2206 if (type == error_mark_node)
2208 if (! TREE_PERMANENT (type))
2210 warning_with_decl (x, "type of external `%s' is not global");
2211 /* By exiting the loop early, we leave TYPE nonzero,
2212 and thus prevent globalization of the decl. */
2215 else if (TREE_CODE (type) == FUNCTION_TYPE
2216 && TYPE_ARG_TYPES (type) != 0)
2217 /* The types might not be truly local,
2218 but the list of arg types certainly is temporary.
2219 Since prototypes are nontraditional,
2220 ok not to do the traditional thing. */
2222 type = TREE_TYPE (type);
2226 b = global_binding_level;
2229 /* This name is new in its binding level.
2230 Install the new declaration and return it. */
2231 if (b == global_binding_level)
2233 /* Install a global value. */
2235 /* If the first global decl has external linkage,
2236 warn if we later see static one. */
2237 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2238 TREE_PUBLIC (name) = 1;
2240 IDENTIFIER_GLOBAL_VALUE (name) = x;
2242 /* We no longer care about any previous block level declarations. */
2243 IDENTIFIER_LIMBO_VALUE (name) = 0;
2245 /* Don't forget if the function was used via an implicit decl. */
2246 if (IDENTIFIER_IMPLICIT_DECL (name)
2247 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2248 TREE_USED (x) = 1, TREE_USED (name) = 1;
2250 /* Don't forget if its address was taken in that way. */
2251 if (IDENTIFIER_IMPLICIT_DECL (name)
2252 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2253 TREE_ADDRESSABLE (x) = 1;
2255 /* Warn about mismatches against previous implicit decl. */
2256 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2257 /* If this real decl matches the implicit, don't complain. */
2258 && ! (TREE_CODE (x) == FUNCTION_DECL
2259 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2260 == integer_type_node)))
2261 pedwarn ("`%s' was previously implicitly declared to return `int'",
2262 IDENTIFIER_POINTER (name));
2264 /* If this decl is `static' and an `extern' was seen previously,
2265 that is erroneous. */
2266 if (TREE_PUBLIC (name)
2267 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2269 /* Okay to redeclare an ANSI built-in as static. */
2270 if (t != 0 && DECL_BUILT_IN (t))
2272 /* Okay to declare a non-ANSI built-in as anything. */
2273 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2275 /* Okay to have global type decl after an earlier extern
2276 declaration inside a lexical block. */
2277 else if (TREE_CODE (x) == TYPE_DECL)
2279 else if (IDENTIFIER_IMPLICIT_DECL (name))
2281 if (! TREE_THIS_VOLATILE (name))
2282 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2283 IDENTIFIER_POINTER (name));
2286 pedwarn ("`%s' was declared `extern' and later `static'",
2287 IDENTIFIER_POINTER (name));
2292 /* Here to install a non-global value. */
2293 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2294 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2295 IDENTIFIER_LOCAL_VALUE (name) = x;
2297 /* If this is an extern function declaration, see if we
2298 have a global definition or declaration for the function. */
2300 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2302 && TREE_CODE (x) == FUNCTION_DECL
2303 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2305 /* We have one. Their types must agree. */
2306 if (! comptypes (TREE_TYPE (x),
2307 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2308 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2311 /* Inner extern decl is inline if global one is.
2312 Copy enough to really inline it. */
2313 if (DECL_INLINE (oldglobal))
2315 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2316 DECL_INITIAL (x) = (current_function_decl == oldglobal
2317 ? 0 : DECL_INITIAL (oldglobal));
2318 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2319 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2320 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2321 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2322 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2323 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2325 /* Inner extern decl is built-in if global one is. */
2326 if (DECL_BUILT_IN (oldglobal))
2328 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2329 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2331 /* Keep the arg types from a file-scope fcn defn. */
2332 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2333 && DECL_INITIAL (oldglobal)
2334 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2335 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2339 #if 0 /* This case is probably sometimes the right thing to do. */
2340 /* If we have a local external declaration,
2341 then any file-scope declaration should not
2342 have been static. */
2343 if (oldlocal == 0 && oldglobal != 0
2344 && !TREE_PUBLIC (oldglobal)
2345 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2346 warning ("`%s' locally external but globally static",
2347 IDENTIFIER_POINTER (name));
2350 /* If we have a local external declaration,
2351 and no file-scope declaration has yet been seen,
2352 then if we later have a file-scope decl it must not be static. */
2354 && DECL_EXTERNAL (x)
2358 TREE_PUBLIC (name) = 1;
2360 /* Save this decl, so that we can do type checking against
2361 other decls after it falls out of scope.
2363 Only save it once. This prevents temporary decls created in
2364 expand_inline_function from being used here, since this
2365 will have been set when the inline function was parsed.
2366 It also helps give slightly better warnings. */
2367 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2368 IDENTIFIER_LIMBO_VALUE (name) = x;
2371 /* Warn if shadowing an argument at the top level of the body. */
2372 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2373 /* This warning doesn't apply to the parms of a nested fcn. */
2374 && ! current_binding_level->parm_flag
2375 /* Check that this is one level down from the parms. */
2376 && current_binding_level->level_chain->parm_flag
2377 /* Check that the decl being shadowed
2378 comes from the parm level, one level up. */
2379 && chain_member (oldlocal, current_binding_level->level_chain->names))
2381 if (TREE_CODE (oldlocal) == PARM_DECL)
2382 pedwarn ("declaration of `%s' shadows a parameter",
2383 IDENTIFIER_POINTER (name));
2385 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2386 IDENTIFIER_POINTER (name));
2389 /* Maybe warn if shadowing something else. */
2390 else if (warn_shadow && !DECL_EXTERNAL (x)
2391 /* No shadow warnings for internally generated vars. */
2392 && DECL_SOURCE_LINE (x) != 0
2393 /* No shadow warnings for vars made for inlining. */
2394 && ! DECL_FROM_INLINE (x))
2396 char *id = IDENTIFIER_POINTER (name);
2398 if (TREE_CODE (x) == PARM_DECL
2399 && current_binding_level->level_chain->parm_flag)
2400 /* Don't warn about the parm names in function declarator
2401 within a function declarator.
2402 It would be nice to avoid warning in any function
2403 declarator in a declaration, as opposed to a definition,
2404 but there is no way to tell it's not a definition. */
2406 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2407 warning ("declaration of `%s' shadows a parameter", id);
2408 else if (oldlocal != 0)
2409 warning ("declaration of `%s' shadows previous local", id);
2410 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2411 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2412 warning ("declaration of `%s' shadows global declaration", id);
2415 /* If storing a local value, there may already be one (inherited).
2416 If so, record it for restoration when this binding level ends. */
2418 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2421 /* Keep count of variables in this level with incomplete type. */
2422 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2426 /* Put decls on list in reverse order.
2427 We will reverse them later if necessary. */
2428 TREE_CHAIN (x) = b->names;
2434 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2437 pushdecl_top_level (x)
2441 register struct binding_level *b = current_binding_level;
2443 current_binding_level = global_binding_level;
2445 current_binding_level = b;
2449 /* Generate an implicit declaration for identifier FUNCTIONID
2450 as a function of type int (). Print a warning if appropriate. */
2453 implicitly_declare (functionid)
2457 int traditional_warning = 0;
2458 /* Only one "implicit declaration" warning per identifier. */
2459 int implicit_warning;
2461 /* Save the decl permanently so we can warn if definition follows. */
2462 push_obstacks_nochange ();
2463 end_temporary_allocation ();
2465 /* We used to reuse an old implicit decl here,
2466 but this loses with inline functions because it can clobber
2467 the saved decl chains. */
2468 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2469 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2471 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2473 /* Warn of implicit decl following explicit local extern decl.
2474 This is probably a program designed for traditional C. */
2475 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2476 traditional_warning = 1;
2478 /* Warn once of an implicit declaration. */
2479 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2481 DECL_EXTERNAL (decl) = 1;
2482 TREE_PUBLIC (decl) = 1;
2484 /* Record that we have an implicit decl and this is it. */
2485 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2487 /* ANSI standard says implicit declarations are in the innermost block.
2488 So we record the decl in the standard fashion.
2489 If flag_traditional is set, pushdecl does it top-level. */
2492 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2493 maybe_objc_check_decl (decl);
2495 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2497 if (mesg_implicit_function_declaration && implicit_warning)
2499 if (mesg_implicit_function_declaration == 2)
2500 error ("implicit declaration of function `%s'",
2501 IDENTIFIER_POINTER (functionid));
2503 warning ("implicit declaration of function `%s'",
2504 IDENTIFIER_POINTER (functionid));
2506 else if (warn_traditional && traditional_warning)
2507 warning ("function `%s' was previously declared within a block",
2508 IDENTIFIER_POINTER (functionid));
2510 /* Write a record describing this implicit function declaration to the
2511 prototypes file (if requested). */
2513 gen_aux_info_record (decl, 0, 1, 0);
2520 /* Return zero if the declaration NEWDECL is valid
2521 when the declaration OLDDECL (assumed to be for the same name)
2522 has already been seen.
2523 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2524 and 3 if it is a conflicting declaration. */
2527 redeclaration_error_message (newdecl, olddecl)
2528 tree newdecl, olddecl;
2530 if (TREE_CODE (newdecl) == TYPE_DECL)
2532 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2534 /* pushdecl creates distinct types for TYPE_DECLs by calling
2535 build_type_copy, so the above comparison generally fails. We do
2536 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2537 is equivalent to what this code used to do before the build_type_copy
2538 call. The variant type distinction should not matter for traditional
2539 code, because it doesn't have type qualifiers. */
2540 if (flag_traditional
2541 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2543 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2547 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2549 /* Declarations of functions can insist on internal linkage
2550 but they can't be inconsistent with internal linkage,
2551 so there can be no error on that account.
2552 However defining the same name twice is no good. */
2553 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2554 /* However, defining once as extern inline and a second
2555 time in another way is ok. */
2556 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2557 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2561 else if (current_binding_level == global_binding_level)
2563 /* Objects declared at top level: */
2564 /* If at least one is a reference, it's ok. */
2565 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2567 /* Reject two definitions. */
2568 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2570 /* Now we have two tentative defs, or one tentative and one real def. */
2571 /* Insist that the linkage match. */
2572 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2576 else if (current_binding_level->parm_flag
2577 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2581 /* Newdecl has block scope. If olddecl has block scope also, then
2582 reject two definitions, and reject a definition together with an
2583 external reference. Otherwise, it is OK, because newdecl must
2584 be an extern reference to olddecl. */
2585 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2586 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2592 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2593 Create one if none exists so far for the current function.
2594 This function is called for both label definitions and label references. */
2600 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2602 if (current_function_decl == 0)
2604 error ("label %s referenced outside of any function",
2605 IDENTIFIER_POINTER (id));
2609 /* Use a label already defined or ref'd with this name. */
2612 /* But not if it is inherited and wasn't declared to be inheritable. */
2613 if (DECL_CONTEXT (decl) != current_function_decl
2614 && ! C_DECLARED_LABEL_FLAG (decl))
2615 return shadow_label (id);
2619 decl = build_decl (LABEL_DECL, id, void_type_node);
2621 /* Make sure every label has an rtx. */
2624 /* A label not explicitly declared must be local to where it's ref'd. */
2625 DECL_CONTEXT (decl) = current_function_decl;
2627 DECL_MODE (decl) = VOIDmode;
2629 /* Say where one reference is to the label,
2630 for the sake of the error if it is not defined. */
2631 DECL_SOURCE_LINE (decl) = lineno;
2632 DECL_SOURCE_FILE (decl) = input_filename;
2634 IDENTIFIER_LABEL_VALUE (id) = decl;
2636 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2641 /* Make a label named NAME in the current function,
2642 shadowing silently any that may be inherited from containing functions
2643 or containing scopes.
2645 Note that valid use, if the label being shadowed
2646 comes from another scope in the same function,
2647 requires calling declare_nonlocal_label right away. */
2653 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2659 /* Check to make sure that the label hasn't already been declared
2660 at this label scope */
2661 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2662 if (TREE_VALUE (dup) == decl)
2664 error ("duplicate label declaration `%s'",
2665 IDENTIFIER_POINTER (name));
2666 error_with_decl (TREE_VALUE (dup),
2667 "this is a previous declaration");
2668 /* Just use the previous declaration. */
2669 return lookup_label (name);
2672 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2673 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2676 return lookup_label (name);
2679 /* Define a label, specifying the location in the source file.
2680 Return the LABEL_DECL node for the label, if the definition is valid.
2681 Otherwise return 0. */
2684 define_label (filename, line, name)
2689 tree decl = lookup_label (name);
2691 /* If label with this name is known from an outer context, shadow it. */
2692 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2694 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2695 IDENTIFIER_LABEL_VALUE (name) = 0;
2696 decl = lookup_label (name);
2699 if (DECL_INITIAL (decl) != 0)
2701 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2706 /* Mark label as having been defined. */
2707 DECL_INITIAL (decl) = error_mark_node;
2708 /* Say where in the source. */
2709 DECL_SOURCE_FILE (decl) = filename;
2710 DECL_SOURCE_LINE (decl) = line;
2715 /* Return the list of declarations of the current level.
2716 Note that this list is in reverse order unless/until
2717 you nreverse it; and when you do nreverse it, you must
2718 store the result back using `storedecls' or you will lose. */
2723 return current_binding_level->names;
2726 /* Return the list of type-tags (for structs, etc) of the current level. */
2731 return current_binding_level->tags;
2734 /* Store the list of declarations of the current level.
2735 This is done for the parameter declarations of a function being defined,
2736 after they are modified in the light of any missing parameters. */
2742 current_binding_level->names = decls;
2745 /* Similarly, store the list of tags of the current level. */
2751 current_binding_level->tags = tags;
2754 /* Given NAME, an IDENTIFIER_NODE,
2755 return the structure (or union or enum) definition for that name.
2756 Searches binding levels from BINDING_LEVEL up to the global level.
2757 If THISLEVEL_ONLY is nonzero, searches only the specified context
2758 (but skips any tag-transparent contexts to find one that is
2759 meaningful for tags).
2760 CODE says which kind of type the caller wants;
2761 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2762 If the wrong kind of type is found, an error is reported. */
2765 lookup_tag (code, name, binding_level, thislevel_only)
2766 enum tree_code code;
2767 struct binding_level *binding_level;
2771 register struct binding_level *level;
2773 for (level = binding_level; level; level = level->level_chain)
2776 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2778 if (TREE_PURPOSE (tail) == name)
2780 if (TREE_CODE (TREE_VALUE (tail)) != code)
2782 /* Definition isn't the kind we were looking for. */
2783 pending_invalid_xref = name;
2784 pending_invalid_xref_file = input_filename;
2785 pending_invalid_xref_line = lineno;
2787 return TREE_VALUE (tail);
2790 if (thislevel_only && ! level->tag_transparent)
2796 /* Print an error message now
2797 for a recent invalid struct, union or enum cross reference.
2798 We don't print them immediately because they are not invalid
2799 when used in the `struct foo;' construct for shadowing. */
2802 pending_xref_error ()
2804 if (pending_invalid_xref != 0)
2805 error_with_file_and_line (pending_invalid_xref_file,
2806 pending_invalid_xref_line,
2807 "`%s' defined as wrong kind of tag",
2808 IDENTIFIER_POINTER (pending_invalid_xref));
2809 pending_invalid_xref = 0;
2812 /* Given a type, find the tag that was defined for it and return the tag name.
2813 Otherwise return 0. */
2816 lookup_tag_reverse (type)
2819 register struct binding_level *level;
2821 for (level = current_binding_level; level; level = level->level_chain)
2824 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2826 if (TREE_VALUE (tail) == type)
2827 return TREE_PURPOSE (tail);
2833 /* Look up NAME in the current binding level and its superiors
2834 in the namespace of variables, functions and typedefs.
2835 Return a ..._DECL node of some kind representing its definition,
2836 or return 0 if it is undefined. */
2843 if (current_binding_level != global_binding_level
2844 && IDENTIFIER_LOCAL_VALUE (name))
2845 val = IDENTIFIER_LOCAL_VALUE (name);
2847 val = IDENTIFIER_GLOBAL_VALUE (name);
2851 /* Similar to `lookup_name' but look only at current binding level. */
2854 lookup_name_current_level (name)
2859 if (current_binding_level == global_binding_level)
2860 return IDENTIFIER_GLOBAL_VALUE (name);
2862 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2865 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2866 if (DECL_NAME (t) == name)
2872 /* Mark ARG for GC. */
2874 mark_binding_level (arg)
2877 struct binding_level *level = *(struct binding_level **) arg;
2881 ggc_mark_tree (level->names);
2882 ggc_mark_tree (level->tags);
2883 ggc_mark_tree (level->shadowed);
2884 ggc_mark_tree (level->blocks);
2885 ggc_mark_tree (level->this_block);
2886 ggc_mark_tree (level->parm_order);
2887 level = level->level_chain;
2891 /* Create the predefined scalar types of C,
2892 and some nodes representing standard constants (0, 1, (void *) 0).
2893 Initialize the global binding level.
2894 Make definitions for built-in primitive functions. */
2897 init_decl_processing ()
2899 register tree endlink;
2900 tree ptr_ftype_void, ptr_ftype_ptr;
2901 int wchar_type_size;
2902 tree array_domain_type;
2904 current_function_decl = NULL;
2905 named_labels = NULL;
2906 current_binding_level = NULL_BINDING_LEVEL;
2907 free_binding_level = NULL_BINDING_LEVEL;
2908 pushlevel (0); /* make the binding_level structure for global names */
2909 global_binding_level = current_binding_level;
2911 build_common_tree_nodes (flag_signed_char);
2913 /* Define `int' and `char' first so that dbx will output them first. */
2914 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2915 integer_type_node));
2916 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2918 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2919 long_integer_type_node));
2920 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2921 unsigned_type_node));
2922 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2923 long_unsigned_type_node));
2924 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2925 long_long_integer_type_node));
2926 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2927 long_long_unsigned_type_node));
2928 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2929 short_integer_type_node));
2930 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2931 short_unsigned_type_node));
2932 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2933 signed_char_type_node));
2934 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2935 unsigned_char_type_node));
2936 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2937 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2938 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2939 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2940 #if HOST_BITS_PER_WIDE_INT >= 64
2941 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2943 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2944 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2945 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2946 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2947 #if HOST_BITS_PER_WIDE_INT >= 64
2948 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
2951 /* `unsigned long' is the standard type for sizeof.
2952 Traditionally, use a signed type.
2953 Note that stddef.h uses `unsigned long',
2954 and this must agree, even if long and int are the same size. */
2956 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2957 if (flag_traditional && TREE_UNSIGNED (sizetype))
2958 set_sizetype (signed_type (sizetype));
2960 /* Create the widest literal types. */
2961 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2962 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2963 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2964 widest_integer_literal_type_node));
2965 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2966 widest_unsigned_literal_type_node));
2968 build_common_tree_nodes_2 (flag_short_double);
2970 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2972 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2975 long_double_type_node));
2976 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2977 complex_integer_type_node));
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2979 complex_float_type_node));
2980 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2981 complex_double_type_node));
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2983 complex_long_double_type_node));
2984 pushdecl (build_decl (TYPE_DECL,
2985 ridpointers[(int) RID_VOID], void_type_node));
2988 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2989 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2990 signed_wchar_type_node = signed_type (wchar_type_node);
2991 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2993 boolean_type_node = integer_type_node;
2994 boolean_true_node = integer_one_node;
2995 boolean_false_node = integer_zero_node;
2997 string_type_node = build_pointer_type (char_type_node);
2998 const_string_type_node
2999 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3001 /* Make a type to be the domain of a few array types
3002 whose domains don't really matter.
3003 200 is small enough that it always fits in size_t
3004 and large enough that it can hold most function names for the
3005 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3006 array_domain_type = build_index_type (build_int_2 (200, 0));
3008 /* make a type for arrays of characters.
3009 With luck nothing will ever really depend on the length of this
3011 char_array_type_node
3012 = build_array_type (char_type_node, array_domain_type);
3013 /* Likewise for arrays of ints. */
3015 = build_array_type (integer_type_node, array_domain_type);
3016 /* This is for wide string constants. */
3017 wchar_array_type_node
3018 = build_array_type (wchar_type_node, array_domain_type);
3020 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3022 default_function_type
3023 = build_function_type (integer_type_node, NULL_TREE);
3025 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3027 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3029 endlink = void_list_node;
3030 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3032 = build_function_type (ptr_type_node,
3033 tree_cons (NULL_TREE, ptr_type_node, endlink));
3035 builtin_function ("__builtin_aggregate_incoming_address",
3036 build_function_type (ptr_type_node, NULL_TREE),
3037 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3039 /* Hooks for the DWARF 2 __throw routine. */
3040 builtin_function ("__builtin_unwind_init",
3041 build_function_type (void_type_node, endlink),
3042 BUILT_IN_UNWIND_INIT, NULL_PTR);
3043 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3044 BUILT_IN_DWARF_CFA, NULL_PTR);
3045 builtin_function ("__builtin_dwarf_fp_regnum",
3046 build_function_type (unsigned_type_node, endlink),
3047 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3048 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3049 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3050 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3051 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3052 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3053 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3055 ("__builtin_eh_return",
3056 build_function_type (void_type_node,
3057 tree_cons (NULL_TREE, ptr_type_node,
3058 tree_cons (NULL_TREE,
3059 type_for_mode (ptr_mode, 0),
3060 tree_cons (NULL_TREE,
3063 BUILT_IN_EH_RETURN, NULL_PTR);
3065 pedantic_lvalues = pedantic;
3067 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3068 declare_function_name ();
3070 start_identifier_warnings ();
3072 /* Prepare to check format strings against argument lists. */
3073 init_function_format_info ();
3077 incomplete_decl_finalize_hook = finish_incomplete_decl;
3079 lang_get_alias_set = c_get_alias_set;
3081 /* Record our roots. */
3083 ggc_add_tree_root (c_global_trees, CTI_MAX);
3084 ggc_add_tree_root (¤t_function_decl, 1);
3085 ggc_add_tree_root (&named_labels, 1);
3086 ggc_add_tree_root (&shadowed_labels, 1);
3087 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3088 mark_binding_level);
3089 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3090 mark_binding_level);
3091 ggc_add_tree_root (&static_ctors, 1);
3092 ggc_add_tree_root (&static_dtors, 1);
3095 /* Return a definition for a builtin function named NAME and whose data type
3096 is TYPE. TYPE should be a function type with argument types.
3097 FUNCTION_CODE tells later passes how to compile calls to this function.
3098 See tree.h for its possible values.
3100 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3101 the name to be called if we can't opencode the function. */
3104 builtin_function (name, type, function_code, library_name)
3107 enum built_in_function function_code;
3108 const char *library_name;
3110 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3111 DECL_EXTERNAL (decl) = 1;
3112 TREE_PUBLIC (decl) = 1;
3113 /* If -traditional, permit redefining a builtin function any way you like.
3114 (Though really, if the program redefines these functions,
3115 it probably won't work right unless compiled with -fno-builtin.) */
3116 if (flag_traditional && name[0] != '_')
3117 DECL_BUILT_IN_NONANSI (decl) = 1;
3119 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3120 make_decl_rtl (decl, NULL_PTR, 1);
3122 if (function_code != NOT_BUILT_IN)
3124 DECL_BUILT_IN (decl) = 1;
3125 DECL_FUNCTION_CODE (decl) = function_code;
3127 /* Warn if a function in the namespace for users
3128 is used without an occasion to consider it declared. */
3129 if (name[0] != '_' || name[1] != '_')
3130 C_DECL_ANTICIPATED (decl) = 1;
3135 /* Called when a declaration is seen that contains no names to declare.
3136 If its type is a reference to a structure, union or enum inherited
3137 from a containing scope, shadow that tag name for the current scope
3138 with a forward reference.
3139 If its type defines a new named structure or union
3140 or defines an enum, it is valid but we need not do anything here.
3141 Otherwise, it is an error. */
3144 shadow_tag (declspecs)
3147 shadow_tag_warned (declspecs, 0);
3151 shadow_tag_warned (declspecs, warned)
3154 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3161 pending_invalid_xref = 0;
3163 /* Remove the attributes from declspecs, since they will confuse the
3165 split_specs_attrs (declspecs, &specs, &attrs);
3167 for (link = specs; link; link = TREE_CHAIN (link))
3169 register tree value = TREE_VALUE (link);
3170 register enum tree_code code = TREE_CODE (value);
3172 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3173 /* Used to test also that TYPE_SIZE (value) != 0.
3174 That caused warning for `struct foo;' at top level in the file. */
3176 register tree name = lookup_tag_reverse (value);
3183 if (warned != 1 && code != ENUMERAL_TYPE)
3184 /* Empty unnamed enum OK */
3186 pedwarn ("unnamed struct/union that defines no instances");
3192 t = lookup_tag (code, name, current_binding_level, 1);
3196 t = make_node (code);
3203 if (!warned && ! in_system_header)
3205 warning ("useless keyword or type name in empty declaration");
3212 error ("two types specified in one empty declaration");
3217 pedwarn ("empty declaration");
3221 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3224 groktypename (typename)
3227 if (TREE_CODE (typename) != TREE_LIST)
3229 return grokdeclarator (TREE_VALUE (typename),
3230 TREE_PURPOSE (typename),
3234 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3237 groktypename_in_parm_context (typename)
3240 if (TREE_CODE (typename) != TREE_LIST)
3242 return grokdeclarator (TREE_VALUE (typename),
3243 TREE_PURPOSE (typename),
3247 /* Decode a declarator in an ordinary declaration or data definition.
3248 This is called as soon as the type information and variable name
3249 have been parsed, before parsing the initializer if any.
3250 Here we create the ..._DECL node, fill in its type,
3251 and put it on the list of decls for the current context.
3252 The ..._DECL node is returned as the value.
3254 Exception: for arrays where the length is not specified,
3255 the type is left null, to be filled in by `finish_decl'.
3257 Function definitions do not come here; they go to start_function
3258 instead. However, external and forward declarations of functions
3259 do go through here. Structure field declarations are done by
3260 grokfield and not through here. */
3262 /* Set this to zero to debug not using the temporary obstack
3263 to parse initializers. */
3264 int debug_temp_inits = 1;
3267 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3268 tree declarator, declspecs;
3270 tree attributes, prefix_attributes;
3272 register tree decl = grokdeclarator (declarator, declspecs,
3273 NORMAL, initialized);
3275 int init_written = initialized;
3277 /* The corresponding pop_obstacks is in finish_decl. */
3278 push_obstacks_nochange ();
3280 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3281 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3282 warning_with_decl (decl, "`%s' is usually a function");
3285 /* Is it valid for this decl to have an initializer at all?
3286 If not, set INITIALIZED to zero, which will indirectly
3287 tell `finish_decl' to ignore the initializer once it is parsed. */
3288 switch (TREE_CODE (decl))
3291 /* typedef foo = bar means give foo the same type as bar.
3292 We haven't parsed bar yet, so `finish_decl' will fix that up.
3293 Any other case of an initialization in a TYPE_DECL is an error. */
3294 if (pedantic || list_length (declspecs) > 1)
3296 error ("typedef `%s' is initialized",
3297 IDENTIFIER_POINTER (DECL_NAME (decl)));
3303 error ("function `%s' is initialized like a variable",
3304 IDENTIFIER_POINTER (DECL_NAME (decl)));
3309 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3310 error ("parameter `%s' is initialized",
3311 IDENTIFIER_POINTER (DECL_NAME (decl)));
3316 /* Don't allow initializations for incomplete types
3317 except for arrays which might be completed by the initialization. */
3318 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3320 /* A complete type is ok if size is fixed. */
3322 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3323 || C_DECL_VARIABLE_SIZE (decl))
3325 error ("variable-sized object may not be initialized");
3329 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3331 error ("variable `%s' has initializer but incomplete type",
3332 IDENTIFIER_POINTER (DECL_NAME (decl)));
3335 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3337 error ("elements of array `%s' have incomplete type",
3338 IDENTIFIER_POINTER (DECL_NAME (decl)));
3345 #if 0 /* Seems redundant with grokdeclarator. */
3346 if (current_binding_level != global_binding_level
3347 && DECL_EXTERNAL (decl)
3348 && TREE_CODE (decl) != FUNCTION_DECL)
3349 warning ("declaration of `%s' has `extern' and is initialized",
3350 IDENTIFIER_POINTER (DECL_NAME (decl)));
3352 DECL_EXTERNAL (decl) = 0;
3353 if (current_binding_level == global_binding_level)
3354 TREE_STATIC (decl) = 1;
3356 /* Tell `pushdecl' this is an initialized decl
3357 even though we don't yet have the initializer expression.
3358 Also tell `finish_decl' it may store the real initializer. */
3359 DECL_INITIAL (decl) = error_mark_node;
3362 /* If this is a function declaration, write a record describing it to the
3363 prototypes file (if requested). */
3365 if (TREE_CODE (decl) == FUNCTION_DECL)
3366 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3368 /* ANSI specifies that a tentative definition which is not merged with
3369 a non-tentative definition behaves exactly like a definition with an
3370 initializer equal to zero. (Section 3.7.2)
3371 -fno-common gives strict ANSI behavior. Usually you don't want it.
3372 This matters only for variables with external linkage. */
3373 if (! flag_no_common || ! TREE_PUBLIC (decl))
3374 DECL_COMMON (decl) = 1;
3376 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3377 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3380 /* Set attributes here so if duplicate decl, will have proper attributes. */
3381 decl_attributes (decl, attributes, prefix_attributes);
3383 /* Add this decl to the current binding level.
3384 TEM may equal DECL or it may be a previous decl of the same name. */
3385 tem = pushdecl (decl);
3387 /* For a local variable, define the RTL now. */
3388 if (current_binding_level != global_binding_level
3389 /* But not if this is a duplicate decl
3390 and we preserved the rtl from the previous one
3391 (which may or may not happen). */
3392 && DECL_RTL (tem) == 0)
3394 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3396 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3397 && DECL_INITIAL (tem) != 0)
3403 /* When parsing and digesting the initializer,
3404 use temporary storage. Do this even if we will ignore the value. */
3405 if (current_binding_level == global_binding_level && debug_temp_inits)
3406 temporary_allocation ();
3412 /* Finish processing of a declaration;
3413 install its initial value.
3414 If the length of an array type is not known before,
3415 it must be determined now, from the initial value, or it is an error. */
3418 finish_decl (decl, init, asmspec_tree)
3422 register tree type = TREE_TYPE (decl);
3423 int was_incomplete = (DECL_SIZE (decl) == 0);
3424 int temporary = allocation_temporary_p ();
3427 /* If a name was specified, get the string. */
3429 asmspec = TREE_STRING_POINTER (asmspec_tree);
3431 /* If `start_decl' didn't like having an initialization, ignore it now. */
3433 if (init != 0 && DECL_INITIAL (decl) == 0)
3435 /* Don't crash if parm is initialized. */
3436 if (TREE_CODE (decl) == PARM_DECL)
3439 if (ITERATOR_P (decl))
3442 error_with_decl (decl, "iterator has no initial value");
3444 init = save_expr (init);
3449 if (TREE_CODE (decl) != TYPE_DECL)
3450 store_init_value (decl, init);
3453 /* typedef foo = bar; store the type of bar as the type of foo. */
3454 TREE_TYPE (decl) = TREE_TYPE (init);
3455 DECL_INITIAL (decl) = init = 0;
3459 /* Pop back to the obstack that is current for this binding level.
3460 This is because MAXINDEX, rtl, etc. to be made below
3461 must go in the permanent obstack. But don't discard the
3462 temporary data yet. */
3464 #if 0 /* pop_obstacks was near the end; this is what was here. */
3465 if (current_binding_level == global_binding_level && temporary)
3466 end_temporary_allocation ();
3469 /* Deduce size of array from initialization, if not already known */
3471 if (TREE_CODE (type) == ARRAY_TYPE
3472 && TYPE_DOMAIN (type) == 0
3473 && TREE_CODE (decl) != TYPE_DECL)
3476 = (TREE_STATIC (decl)
3477 /* Even if pedantic, an external linkage array
3478 may have incomplete type at first. */
3479 ? pedantic && !TREE_PUBLIC (decl)
3480 : !DECL_EXTERNAL (decl));
3482 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3484 /* Get the completed type made by complete_array_type. */
3485 type = TREE_TYPE (decl);
3488 error_with_decl (decl, "initializer fails to determine size of `%s'");
3493 error_with_decl (decl, "array size missing in `%s'");
3494 /* If a `static' var's size isn't known,
3495 make it extern as well as static, so it does not get
3497 If it is not `static', then do not mark extern;
3498 finish_incomplete_decl will give it a default size
3499 and it will get allocated. */
3500 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3501 DECL_EXTERNAL (decl) = 1;
3504 /* TYPE_MAX_VALUE is always one less than the number of elements
3505 in the array, because we start counting at zero. Therefore,
3506 warn only if the value is less than zero. */
3507 if (pedantic && TYPE_DOMAIN (type) != 0
3508 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3509 error_with_decl (decl, "zero or negative size array `%s'");
3511 layout_decl (decl, 0);
3514 if (TREE_CODE (decl) == VAR_DECL)
3516 if (DECL_SIZE (decl) == 0
3517 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3518 layout_decl (decl, 0);
3520 if (DECL_SIZE (decl) == 0
3521 && (TREE_STATIC (decl)
3523 /* A static variable with an incomplete type
3524 is an error if it is initialized.
3525 Also if it is not file scope.
3526 Otherwise, let it through, but if it is not `extern'
3527 then it may cause an error message later. */
3528 /* A duplicate_decls call could have changed an extern
3529 declaration into a file scope one. This can be detected
3530 by TREE_ASM_WRITTEN being set. */
3531 (DECL_INITIAL (decl) != 0
3532 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3534 /* An automatic variable with an incomplete type
3536 !DECL_EXTERNAL (decl)))
3538 error_with_decl (decl, "storage size of `%s' isn't known");
3539 TREE_TYPE (decl) = error_mark_node;
3542 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3543 && DECL_SIZE (decl) != 0)
3545 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3546 constant_expression_warning (DECL_SIZE (decl));
3548 error_with_decl (decl, "storage size of `%s' isn't constant");
3551 if (TREE_USED (type))
3552 TREE_USED (decl) = 1;
3555 /* If this is a function and an assembler name is specified, it isn't
3556 builtin any more. Also reset DECL_RTL so we can give it its new
3558 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3560 DECL_BUILT_IN (decl) = 0;
3561 DECL_RTL (decl) = 0;
3562 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3565 /* Output the assembler code and/or RTL code for variables and functions,
3566 unless the type is an undefined structure or union.
3567 If not, it will get done when the type is completed. */
3569 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3571 if ((flag_traditional || TREE_PERMANENT (decl))
3572 && allocation_temporary_p ())
3574 push_obstacks_nochange ();
3575 end_temporary_allocation ();
3576 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3577 maybe_objc_check_decl (decl);
3578 rest_of_decl_compilation (decl, asmspec,
3579 (DECL_CONTEXT (decl) == 0
3580 || TREE_ASM_WRITTEN (decl)),
3586 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3587 maybe_objc_check_decl (decl);
3588 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3591 if (DECL_CONTEXT (decl) != 0)
3593 /* Recompute the RTL of a local array now
3594 if it used to be an incomplete type. */
3596 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3598 /* If we used it already as memory, it must stay in memory. */
3599 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3600 /* If it's still incomplete now, no init will save it. */
3601 if (DECL_SIZE (decl) == 0)
3602 DECL_INITIAL (decl) = 0;
3605 /* Compute and store the initial value. */
3606 if (TREE_CODE (decl) != FUNCTION_DECL)
3607 expand_decl_init (decl);
3611 if (TREE_CODE (decl) == TYPE_DECL)
3613 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3614 maybe_objc_check_decl (decl);
3615 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3619 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3620 /* This test used to include TREE_PERMANENT, however, we have the same
3621 problem with initializers at the function level. Such initializers get
3622 saved until the end of the function on the momentary_obstack. */
3623 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3625 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3626 space with DECL_ARG_TYPE. */
3627 && TREE_CODE (decl) != PARM_DECL)
3629 /* We need to remember that this array HAD an initialization,
3630 but discard the actual temporary nodes,
3631 since we can't have a permanent node keep pointing to them. */
3632 /* We make an exception for inline functions, since it's
3633 normal for a local extern redeclaration of an inline function
3634 to have a copy of the top-level decl's DECL_INLINE. */
3635 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3637 /* If this is a const variable, then preserve the
3638 initializer instead of discarding it so that we can optimize
3639 references to it. */
3640 /* This test used to include TREE_STATIC, but this won't be set
3641 for function level initializers. */
3642 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3644 preserve_initializer ();
3645 /* Hack? Set the permanent bit for something that is permanent,
3646 but not on the permanent obstack, so as to convince
3647 output_constant_def to make its rtl on the permanent
3649 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3651 /* The initializer and DECL must have the same (or equivalent
3652 types), but if the initializer is a STRING_CST, its type
3653 might not be on the right obstack, so copy the type
3655 TREE_TYPE (DECL_INITIAL (decl)) = type;
3658 DECL_INITIAL (decl) = error_mark_node;
3662 /* If requested, warn about definitions of large data objects. */
3664 if (warn_larger_than
3665 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3666 && !DECL_EXTERNAL (decl))
3668 register tree decl_size = DECL_SIZE (decl);
3670 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3672 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3674 if (units > larger_than_size)
3675 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3680 /* Resume permanent allocation, if not within a function. */
3681 /* The corresponding push_obstacks_nochange is in start_decl,
3682 and in push_parm_decl and in grokfield. */
3686 /* If we have gone back from temporary to permanent allocation,
3687 actually free the temporary space that we no longer need. */
3688 if (temporary && !allocation_temporary_p ())
3689 permanent_allocation (0);
3691 /* At the end of a declaration, throw away any variable type sizes
3692 of types defined inside that declaration. There is no use
3693 computing them in the following function definition. */
3694 if (current_binding_level == global_binding_level)
3695 get_pending_sizes ();
3698 /* If DECL has a cleanup, build and return that cleanup here.
3699 This is a callback called by expand_expr. */
3702 maybe_build_cleanup (decl)
3703 tree decl ATTRIBUTE_UNUSED;
3705 /* There are no cleanups in C. */
3709 /* Given a parsed parameter declaration,
3710 decode it into a PARM_DECL and push that on the current binding level.
3711 Also, for the sake of forward parm decls,
3712 record the given order of parms in `parm_order'. */
3715 push_parm_decl (parm)
3719 int old_immediate_size_expand = immediate_size_expand;
3720 /* Don't try computing parm sizes now -- wait till fn is called. */
3721 immediate_size_expand = 0;
3723 /* The corresponding pop_obstacks is in finish_decl. */
3724 push_obstacks_nochange ();
3726 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3727 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3728 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3729 TREE_PURPOSE (TREE_VALUE (parm)));
3732 if (DECL_NAME (decl))
3735 olddecl = lookup_name (DECL_NAME (decl));
3736 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3737 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3741 decl = pushdecl (decl);
3743 immediate_size_expand = old_immediate_size_expand;
3745 current_binding_level->parm_order
3746 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3748 /* Add this decl to the current binding level. */
3749 finish_decl (decl, NULL_TREE, NULL_TREE);
3752 /* Clear the given order of parms in `parm_order'.
3753 Used at start of parm list,
3754 and also at semicolon terminating forward decls. */
3759 current_binding_level->parm_order = NULL_TREE;
3762 /* Make TYPE a complete type based on INITIAL_VALUE.
3763 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3764 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3767 complete_array_type (type, initial_value, do_default)
3772 register tree maxindex = NULL_TREE;
3777 /* Note MAXINDEX is really the maximum index,
3778 one less than the size. */
3779 if (TREE_CODE (initial_value) == STRING_CST)
3782 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3783 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3786 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3788 tree elts = CONSTRUCTOR_ELTS (initial_value);
3789 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3790 for (; elts; elts = TREE_CHAIN (elts))
3792 if (TREE_PURPOSE (elts))
3793 maxindex = TREE_PURPOSE (elts);
3795 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3797 maxindex = copy_node (maxindex);
3801 /* Make an error message unless that happened already. */
3802 if (initial_value != error_mark_node)
3805 /* Prevent further error messages. */
3806 maxindex = build_int_2 (0, 0);
3813 maxindex = build_int_2 (0, 0);
3819 TYPE_DOMAIN (type) = build_index_type (maxindex);
3820 if (!TREE_TYPE (maxindex))
3821 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3824 /* Lay out the type now that we can get the real answer. */
3831 /* Given declspecs and a declarator,
3832 determine the name and type of the object declared
3833 and construct a ..._DECL node for it.
3834 (In one case we can return a ..._TYPE node instead.
3835 For invalid input we sometimes return 0.)
3837 DECLSPECS is a chain of tree_list nodes whose value fields
3838 are the storage classes and type specifiers.
3840 DECL_CONTEXT says which syntactic context this declaration is in:
3841 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3842 FUNCDEF for a function definition. Like NORMAL but a few different
3843 error messages in each case. Return value may be zero meaning
3844 this definition is too screwy to try to parse.
3845 PARM for a parameter declaration (either within a function prototype
3846 or before a function body). Make a PARM_DECL, or return void_type_node.
3847 TYPENAME if for a typename (in a cast or sizeof).
3848 Don't make a DECL node; just return the ..._TYPE node.
3849 FIELD for a struct or union field; make a FIELD_DECL.
3850 BITFIELD for a field with specified width.
3851 INITIALIZED is 1 if the decl has an initializer.
3853 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3854 It may also be so in the PARM case, for a prototype where the
3855 argument type is specified but not the name.
3857 This function is where the complicated C meanings of `static'
3858 and `extern' are interpreted. */
3861 grokdeclarator (declarator, declspecs, decl_context, initialized)
3864 enum decl_context decl_context;
3869 tree type = NULL_TREE;
3874 int type_quals = TYPE_UNQUALIFIED;
3876 int explicit_int = 0;
3877 int explicit_char = 0;
3878 int defaulted_int = 0;
3879 tree typedef_decl = 0;
3881 tree typedef_type = 0;
3882 int funcdef_flag = 0;
3883 enum tree_code innermost_code = ERROR_MARK;
3885 int size_varies = 0;
3886 tree decl_machine_attr = NULL_TREE;
3888 if (decl_context == BITFIELD)
3889 bitfield = 1, decl_context = FIELD;
3891 if (decl_context == FUNCDEF)
3892 funcdef_flag = 1, decl_context = NORMAL;
3894 push_obstacks_nochange ();
3896 if (flag_traditional && allocation_temporary_p ())
3897 end_temporary_allocation ();
3899 /* Look inside a declarator for the name being declared
3900 and get it as a string, for an error message. */
3902 register tree decl = declarator;
3906 switch (TREE_CODE (decl))
3911 innermost_code = TREE_CODE (decl);
3912 decl = TREE_OPERAND (decl, 0);
3915 case IDENTIFIER_NODE:
3916 name = IDENTIFIER_POINTER (decl);
3927 /* A function definition's declarator must have the form of
3928 a function declarator. */
3930 if (funcdef_flag && innermost_code != CALL_EXPR)
3933 /* Anything declared one level down from the top level
3934 must be one of the parameters of a function
3935 (because the body is at least two levels down). */
3937 /* If this looks like a function definition, make it one,
3938 even if it occurs where parms are expected.
3939 Then store_parm_decls will reject it and not use it as a parm. */
3940 if (decl_context == NORMAL && !funcdef_flag
3941 && current_binding_level->parm_flag)
3942 decl_context = PARM;
3944 /* Look through the decl specs and record which ones appear.
3945 Some typespecs are defined as built-in typenames.
3946 Others, the ones that are modifiers of other types,
3947 are represented by bits in SPECBITS: set the bits for
3948 the modifiers that appear. Storage class keywords are also in SPECBITS.
3950 If there is a typedef name or a type, store the type in TYPE.
3951 This includes builtin typedefs such as `int'.
3953 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3954 and did not come from a user typedef.
3956 Set LONGLONG if `long' is mentioned twice. */
3958 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3961 register tree id = TREE_VALUE (spec);
3963 if (id == ridpointers[(int) RID_INT])
3965 if (id == ridpointers[(int) RID_CHAR])
3968 if (TREE_CODE (id) == IDENTIFIER_NODE)
3969 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3971 if (ridpointers[i] == id)
3973 if (i == (int) RID_LONG && specbits & (1<<i))
3976 error ("`long long long' is too long for GCC");
3979 if (pedantic && ! in_system_header && warn_long_long)
3980 pedwarn ("ANSI C does not support `long long'");
3984 else if (specbits & (1 << i))
3985 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3991 error ("two or more data types in declaration of `%s'", name);
3992 /* Actual typedefs come to us as TYPE_DECL nodes. */
3993 else if (TREE_CODE (id) == TYPE_DECL)
3995 type = TREE_TYPE (id);
3996 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3999 /* Built-in types come as identifiers. */
4000 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4002 register tree t = lookup_name (id);
4003 if (TREE_TYPE (t) == error_mark_node)
4005 else if (!t || TREE_CODE (t) != TYPE_DECL)
4006 error ("`%s' fails to be a typedef or built in type",
4007 IDENTIFIER_POINTER (id));
4010 type = TREE_TYPE (t);
4014 else if (TREE_CODE (id) != ERROR_MARK)
4020 typedef_type = type;
4022 size_varies = C_TYPE_VARIABLE_SIZE (type);
4024 /* No type at all: default to `int', and set DEFAULTED_INT
4025 because it was not a user-defined typedef. */
4029 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4030 | (1 << (int) RID_SIGNED)
4031 | (1 << (int) RID_UNSIGNED))))
4032 /* Don't warn about typedef foo = bar. */
4033 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4034 && ! (in_system_header && ! allocation_temporary_p ()))
4036 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4037 and this is a function, or if -Wimplicit; prefer the former
4038 warning since it is more explicit. */
4039 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4040 warn_about_return_type = 1;
4041 else if (warn_implicit_int || flag_isoc9x)
4042 warning ("type defaults to `int' in declaration of `%s'", name);
4046 type = integer_type_node;
4049 /* Now process the modifiers that were specified
4050 and check for invalid combinations. */
4052 /* Long double is a special combination. */
4054 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4055 && TYPE_MAIN_VARIANT (type) == double_type_node)
4057 specbits &= ~ (1 << (int) RID_LONG);
4058 type = long_double_type_node;
4061 /* Check all other uses of type modifiers. */
4063 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4064 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4068 if ((specbits & 1 << (int) RID_LONG)
4069 && (specbits & 1 << (int) RID_SHORT))
4070 error ("both long and short specified for `%s'", name);
4071 else if (((specbits & 1 << (int) RID_LONG)
4072 || (specbits & 1 << (int) RID_SHORT))
4074 error ("long or short specified with char for `%s'", name);
4075 else if (((specbits & 1 << (int) RID_LONG)
4076 || (specbits & 1 << (int) RID_SHORT))
4077 && TREE_CODE (type) == REAL_TYPE)
4079 static int already = 0;
4081 error ("long or short specified with floating type for `%s'", name);
4082 if (! already && ! pedantic)
4084 error ("the only valid combination is `long double'");
4088 else if ((specbits & 1 << (int) RID_SIGNED)
4089 && (specbits & 1 << (int) RID_UNSIGNED))
4090 error ("both signed and unsigned specified for `%s'", name);
4091 else if (TREE_CODE (type) != INTEGER_TYPE)
4092 error ("long, short, signed or unsigned invalid for `%s'", name);
4096 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4098 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4100 if (flag_pedantic_errors)
4105 /* Discard the type modifiers if they are invalid. */
4108 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4109 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4114 if ((specbits & (1 << (int) RID_COMPLEX))
4115 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4117 error ("complex invalid for `%s'", name);
4118 specbits &= ~ (1 << (int) RID_COMPLEX);
4121 /* Decide whether an integer type is signed or not.
4122 Optionally treat bitfields as signed by default. */
4123 if (specbits & 1 << (int) RID_UNSIGNED
4124 /* Traditionally, all bitfields are unsigned. */
4125 || (bitfield && flag_traditional
4126 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4127 || (bitfield && ! flag_signed_bitfields
4128 && (explicit_int || defaulted_int || explicit_char
4129 /* A typedef for plain `int' without `signed'
4130 can be controlled just like plain `int'. */
4131 || ! (typedef_decl != 0
4132 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4133 && TREE_CODE (type) != ENUMERAL_TYPE
4134 && !(specbits & 1 << (int) RID_SIGNED)))
4137 type = long_long_unsigned_type_node;
4138 else if (specbits & 1 << (int) RID_LONG)
4139 type = long_unsigned_type_node;
4140 else if (specbits & 1 << (int) RID_SHORT)
4141 type = short_unsigned_type_node;
4142 else if (type == char_type_node)
4143 type = unsigned_char_type_node;
4144 else if (typedef_decl)
4145 type = unsigned_type (type);
4147 type = unsigned_type_node;
4149 else if ((specbits & 1 << (int) RID_SIGNED)
4150 && type == char_type_node)
4151 type = signed_char_type_node;
4153 type = long_long_integer_type_node;
4154 else if (specbits & 1 << (int) RID_LONG)
4155 type = long_integer_type_node;
4156 else if (specbits & 1 << (int) RID_SHORT)
4157 type = short_integer_type_node;
4159 if (specbits & 1 << (int) RID_COMPLEX)
4161 /* If we just have "complex", it is equivalent to
4162 "complex double", but if any modifiers at all are specified it is
4163 the complex form of TYPE. E.g, "complex short" is
4164 "complex short int". */
4166 if (defaulted_int && ! longlong
4167 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4168 | (1 << (int) RID_SIGNED)
4169 | (1 << (int) RID_UNSIGNED))))
4170 type = complex_double_type_node;
4171 else if (type == integer_type_node)
4172 type = complex_integer_type_node;
4173 else if (type == float_type_node)
4174 type = complex_float_type_node;
4175 else if (type == double_type_node)
4176 type = complex_double_type_node;
4177 else if (type == long_double_type_node)
4178 type = complex_long_double_type_node;
4180 type = build_complex_type (type);
4183 /* Figure out the type qualifiers for the declaration. There are
4184 two ways a declaration can become qualified. One is something
4185 like `const int i' where the `const' is explicit. Another is
4186 something like `typedef const int CI; CI i' where the type of the
4187 declaration contains the `const'. */
4188 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4189 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4190 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4191 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4193 pedwarn ("duplicate `const'");
4195 pedwarn ("duplicate `restrict'");
4197 pedwarn ("duplicate `volatile'");
4198 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4199 type = TYPE_MAIN_VARIANT (type);
4200 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4201 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4202 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4204 /* Warn if two storage classes are given. Default to `auto'. */
4209 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4210 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4211 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4212 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4213 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4214 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4216 /* Warn about storage classes that are invalid for certain
4217 kinds of declarations (parameters, typenames, etc.). */
4220 error ("multiple storage classes in declaration of `%s'", name);
4221 else if (funcdef_flag
4223 & ((1 << (int) RID_REGISTER)
4224 | (1 << (int) RID_AUTO)
4225 | (1 << (int) RID_TYPEDEF))))
4227 if (specbits & 1 << (int) RID_AUTO
4228 && (pedantic || current_binding_level == global_binding_level))
4229 pedwarn ("function definition declared `auto'");
4230 if (specbits & 1 << (int) RID_REGISTER)
4231 error ("function definition declared `register'");
4232 if (specbits & 1 << (int) RID_TYPEDEF)
4233 error ("function definition declared `typedef'");
4234 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4235 | (1 << (int) RID_AUTO));
4237 else if (decl_context != NORMAL && nclasses > 0)
4239 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4243 error ((decl_context == FIELD
4244 ? "storage class specified for structure field `%s'"
4245 : (decl_context == PARM
4246 ? "storage class specified for parameter `%s'"
4247 : "storage class specified for typename")),
4249 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4250 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4251 | (1 << (int) RID_EXTERN));
4254 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4256 /* `extern' with initialization is invalid if not at top level. */
4257 if (current_binding_level == global_binding_level)
4258 warning ("`%s' initialized and declared `extern'", name);
4260 error ("`%s' has both `extern' and initializer", name);
4262 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4263 && current_binding_level != global_binding_level)
4264 error ("nested function `%s' declared `extern'", name);
4265 else if (current_binding_level == global_binding_level
4266 && specbits & (1 << (int) RID_AUTO))
4267 error ("top-level declaration of `%s' specifies `auto'", name);
4268 else if ((specbits & 1 << (int) RID_ITERATOR)
4269 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4271 error ("iterator `%s' has derived type", name);
4272 type = error_mark_node;
4274 else if ((specbits & 1 << (int) RID_ITERATOR)
4275 && TREE_CODE (type) != INTEGER_TYPE)
4277 error ("iterator `%s' has noninteger type", name);
4278 type = error_mark_node;
4282 /* Now figure out the structure of the declarator proper.
4283 Descend through it, creating more complex types, until we reach
4284 the declared identifier (or NULL_TREE, in an absolute declarator). */
4286 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4288 if (type == error_mark_node)
4290 declarator = TREE_OPERAND (declarator, 0);
4294 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4295 an INDIRECT_REF (for *...),
4296 a CALL_EXPR (for ...(...)),
4297 an identifier (for the name being declared)
4298 or a null pointer (for the place in an absolute declarator
4299 where the name was omitted).
4300 For the last two cases, we have just exited the loop.
4302 At this point, TYPE is the type of elements of an array,
4303 or for a function to return, or for a pointer to point to.
4304 After this sequence of ifs, TYPE is the type of the
4305 array or function or pointer, and DECLARATOR has had its
4306 outermost layer removed. */
4308 if (TREE_CODE (declarator) == ARRAY_REF)
4310 register tree itype = NULL_TREE;
4311 register tree size = TREE_OPERAND (declarator, 1);
4312 /* An uninitialized decl with `extern' is a reference. */
4313 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4314 /* The index is a signed object `sizetype' bits wide. */
4315 tree index_type = signed_type (sizetype);
4317 declarator = TREE_OPERAND (declarator, 0);
4319 /* Check for some types that there cannot be arrays of. */
4321 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4323 error ("declaration of `%s' as array of voids", name);
4324 type = error_mark_node;
4327 if (TREE_CODE (type) == FUNCTION_TYPE)
4329 error ("declaration of `%s' as array of functions", name);
4330 type = error_mark_node;
4333 if (size == error_mark_node)
4334 type = error_mark_node;
4336 if (type == error_mark_node)
4339 /* If this is a block level extern, it must live past the end
4340 of the function so that we can check it against other extern
4341 declarations (IDENTIFIER_LIMBO_VALUE). */
4342 if (extern_ref && allocation_temporary_p ())
4343 end_temporary_allocation ();
4345 /* If size was specified, set ITYPE to a range-type for that size.
4346 Otherwise, ITYPE remains null. finish_decl may figure it out
4347 from an initial value. */
4351 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4352 STRIP_TYPE_NOPS (size);
4354 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4355 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4357 error ("size of array `%s' has non-integer type", name);
4358 size = integer_one_node;
4361 if (pedantic && integer_zerop (size))
4362 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4364 if (TREE_CODE (size) == INTEGER_CST)
4366 constant_expression_warning (size);
4367 if (tree_int_cst_sgn (size) < 0)
4369 error ("size of array `%s' is negative", name);
4370 size = integer_one_node;
4375 /* Make sure the array size remains visibly nonconstant
4376 even if it is (eg) a const variable with known value. */
4381 if (TREE_CONSTANT (size))
4382 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4384 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4388 /* Convert size to index_type, so that if it is a variable
4389 the computations will be done in the proper mode. */
4390 itype = fold (build (MINUS_EXPR, index_type,
4391 convert (index_type, size),
4392 convert (index_type, size_one_node)));
4394 /* If that overflowed, the array is too big.
4395 ??? While a size of INT_MAX+1 technically shouldn't cause
4396 an overflow (because we subtract 1), the overflow is recorded
4397 during the conversion to index_type, before the subtraction.
4398 Handling this case seems like an unnecessary complication. */
4399 if (TREE_OVERFLOW (itype))
4401 error ("size of array `%s' is too large", name);
4402 type = error_mark_node;
4407 itype = variable_size (itype);
4408 itype = build_index_type (itype);
4411 #if 0 /* This had bad results for pointers to arrays, as in
4412 union incomplete (*foo)[4]; */
4413 /* Complain about arrays of incomplete types, except in typedefs. */
4415 if (TYPE_SIZE (type) == 0
4416 /* Avoid multiple warnings for nested array types. */
4417 && TREE_CODE (type) != ARRAY_TYPE
4418 && !(specbits & (1 << (int) RID_TYPEDEF))
4419 && !C_TYPE_BEING_DEFINED (type))
4420 warning ("array type has incomplete element type");
4423 #if 0 /* We shouldn't have a function type here at all!
4424 Functions aren't allowed as array elements. */
4425 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4426 && (constp || volatilep))
4427 pedwarn ("ANSI C forbids const or volatile function types");
4430 /* Build the array type itself, then merge any constancy or
4431 volatility into the target type. We must do it in this order
4432 to ensure that the TYPE_MAIN_VARIANT field of the array type
4433 is set correctly. */
4435 type = build_array_type (type, itype);
4437 type = c_build_qualified_type (type, type_quals);
4439 #if 0 /* don't clear these; leave them set so that the array type
4440 or the variable is itself const or volatile. */
4441 type_quals = TYPE_UNQUALIFIED;
4445 C_TYPE_VARIABLE_SIZE (type) = 1;
4447 else if (TREE_CODE (declarator) == CALL_EXPR)
4449 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4450 || current_binding_level == global_binding_level);
4453 /* Declaring a function type.
4454 Make sure we have a valid type for the function to return. */
4455 if (type == error_mark_node)
4460 /* Warn about some types functions can't return. */
4462 if (TREE_CODE (type) == FUNCTION_TYPE)
4464 error ("`%s' declared as function returning a function", name);
4465 type = integer_type_node;
4467 if (TREE_CODE (type) == ARRAY_TYPE)
4469 error ("`%s' declared as function returning an array", name);
4470 type = integer_type_node;
4473 #ifndef TRADITIONAL_RETURN_FLOAT
4474 /* Traditionally, declaring return type float means double. */
4476 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4477 type = double_type_node;
4478 #endif /* TRADITIONAL_RETURN_FLOAT */
4480 /* If this is a block level extern, it must live past the end
4481 of the function so that we can check it against other extern
4482 declarations (IDENTIFIER_LIMBO_VALUE). */
4483 if (extern_ref && allocation_temporary_p ())
4484 end_temporary_allocation ();
4486 /* Construct the function type and go to the next
4487 inner layer of declarator. */
4489 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4491 /* Say it's a definition
4492 only for the CALL_EXPR
4493 closest to the identifier. */
4494 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4495 #if 0 /* This seems to be false. We turn off temporary allocation
4496 above in this function if -traditional.
4497 And this code caused inconsistent results with prototypes:
4498 callers would ignore them, and pass arguments wrong. */
4500 /* Omit the arg types if -traditional, since the arg types
4501 and the list links might not be permanent. */
4502 type = build_function_type (type,
4504 ? NULL_TREE : arg_types);
4506 /* Type qualifiers before the return type of the function
4507 qualify the return type, not the function type. */
4509 type = c_build_qualified_type (type, type_quals);
4510 type_quals = TYPE_UNQUALIFIED;
4512 type = build_function_type (type, arg_types);
4513 declarator = TREE_OPERAND (declarator, 0);
4515 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4516 the formal parameter list of this FUNCTION_TYPE to point to
4517 the FUNCTION_TYPE node itself. */
4522 for (link = last_function_parm_tags;
4524 link = TREE_CHAIN (link))
4525 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4528 else if (TREE_CODE (declarator) == INDIRECT_REF)
4530 /* Merge any constancy or volatility into the target type
4533 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4535 pedwarn ("ANSI C forbids qualified function types");
4537 type = c_build_qualified_type (type, type_quals);
4538 type_quals = TYPE_UNQUALIFIED;
4541 type = build_pointer_type (type);
4543 /* Process a list of type modifier keywords
4544 (such as const or volatile) that were given inside the `*'. */
4546 if (TREE_TYPE (declarator))
4548 register tree typemodlist;
4554 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4555 typemodlist = TREE_CHAIN (typemodlist))
4557 tree qualifier = TREE_VALUE (typemodlist);
4559 if (qualifier == ridpointers[(int) RID_CONST])
4561 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4563 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4568 error ("invalid type modifier within pointer declarator");
4572 pedwarn ("duplicate `const'");
4574 pedwarn ("duplicate `volatile'");
4576 pedwarn ("duplicate `restrict'");
4578 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4579 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4580 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4583 declarator = TREE_OPERAND (declarator, 0);
4590 /* Now TYPE has the actual type. */
4592 /* Did array size calculations overflow? */
4594 if (TREE_CODE (type) == ARRAY_TYPE
4596 && TREE_OVERFLOW (TYPE_SIZE (type)))
4597 error ("size of array `%s' is too large", name);
4599 /* If this is declaring a typedef name, return a TYPE_DECL. */
4601 if (specbits & (1 << (int) RID_TYPEDEF))
4604 /* Note that the grammar rejects storage classes
4605 in typenames, fields or parameters */
4606 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4608 pedwarn ("ANSI C forbids qualified function types");
4610 type = c_build_qualified_type (type, type_quals);
4611 decl = build_decl (TYPE_DECL, declarator, type);
4612 if ((specbits & (1 << (int) RID_SIGNED))
4613 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4614 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4619 /* Detect the case of an array type of unspecified size
4620 which came, as such, direct from a typedef name.
4621 We must copy the type, so that each identifier gets
4622 a distinct type, so that each identifier's size can be
4623 controlled separately by its own initializer. */
4625 if (type != 0 && typedef_type != 0
4626 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4627 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4629 type = build_array_type (TREE_TYPE (type), 0);
4631 C_TYPE_VARIABLE_SIZE (type) = 1;
4634 /* If this is a type name (such as, in a cast or sizeof),
4635 compute the type and return it now. */
4637 if (decl_context == TYPENAME)
4639 /* Note that the grammar rejects storage classes
4640 in typenames, fields or parameters */
4641 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4643 pedwarn ("ANSI C forbids const or volatile function types");
4645 type = c_build_qualified_type (type, type_quals);
4650 /* Aside from typedefs and type names (handle above),
4651 `void' at top level (not within pointer)
4652 is allowed only in public variables.
4653 We don't complain about parms either, but that is because
4654 a better error message can be made later. */
4656 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4657 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4658 && ((specbits & (1 << (int) RID_EXTERN))
4659 || (current_binding_level == global_binding_level
4661 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4663 error ("variable or field `%s' declared void", name);
4664 type = integer_type_node;
4667 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4668 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4673 if (decl_context == PARM)
4675 tree type_as_written = type;
4678 /* A parameter declared as an array of T is really a pointer to T.
4679 One declared as a function is really a pointer to a function. */
4681 if (TREE_CODE (type) == ARRAY_TYPE)
4683 /* Transfer const-ness of array into that of type pointed to. */
4684 type = TREE_TYPE (type);
4686 type = c_build_qualified_type (type, type_quals);
4687 type = build_pointer_type (type);
4688 type_quals = TYPE_UNQUALIFIED;
4691 else if (TREE_CODE (type) == FUNCTION_TYPE)
4693 if (pedantic && type_quals)
4694 pedwarn ("ANSI C forbids qualified function types");
4696 type = c_build_qualified_type (type, type_quals);
4697 type = build_pointer_type (type);
4698 type_quals = TYPE_UNQUALIFIED;
4701 decl = build_decl (PARM_DECL, declarator, type);
4703 C_DECL_VARIABLE_SIZE (decl) = 1;
4705 /* Compute the type actually passed in the parmlist,
4706 for the case where there is no prototype.
4707 (For example, shorts and chars are passed as ints.)
4708 When there is a prototype, this is overridden later. */
4710 if (type == error_mark_node)
4711 promoted_type = type;
4714 promoted_type = simple_type_promotes_to (type);
4715 if (! promoted_type)
4716 promoted_type = type;
4719 DECL_ARG_TYPE (decl) = promoted_type;
4720 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4722 else if (decl_context == FIELD)
4724 /* Structure field. It may not be a function. */
4726 if (TREE_CODE (type) == FUNCTION_TYPE)
4728 error ("field `%s' declared as a function", name);
4729 type = build_pointer_type (type);
4731 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4733 error ("field `%s' has incomplete type", name);
4734 type = error_mark_node;
4736 /* Move type qualifiers down to element of an array. */
4737 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4739 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4741 TYPE_DOMAIN (type));
4742 #if 0 /* Leave the field const or volatile as well. */
4743 type_quals = TYPE_UNQUALIFIED;
4746 decl = build_decl (FIELD_DECL, declarator, type);
4748 C_DECL_VARIABLE_SIZE (decl) = 1;
4750 else if (TREE_CODE (type) == FUNCTION_TYPE)
4752 /* Every function declaration is "external"
4753 except for those which are inside a function body
4754 in which `auto' is used.
4755 That is a case not specified by ANSI C,
4756 and we use it for forward declarations for nested functions. */
4757 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4758 || current_binding_level == global_binding_level);
4760 if (specbits & (1 << (int) RID_AUTO)
4761 && (pedantic || current_binding_level == global_binding_level))
4762 pedwarn ("invalid storage class for function `%s'", name);
4763 if (specbits & (1 << (int) RID_REGISTER))
4764 error ("invalid storage class for function `%s'", name);
4765 /* Function declaration not at top level.
4766 Storage classes other than `extern' are not allowed
4767 and `extern' makes no difference. */
4768 if (current_binding_level != global_binding_level
4769 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4771 pedwarn ("invalid storage class for function `%s'", name);
4773 /* If this is a block level extern, it must live past the end
4774 of the function so that we can check it against other
4775 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4776 if (extern_ref && allocation_temporary_p ())
4777 end_temporary_allocation ();
4779 decl = build_decl (FUNCTION_DECL, declarator, type);
4780 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4782 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4783 pedwarn ("ANSI C forbids qualified function types");
4786 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4787 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4788 && ! DECL_IN_SYSTEM_HEADER (decl))
4789 pedwarn ("ANSI C forbids qualified void function return type");
4791 /* GNU C interprets a `volatile void' return type to indicate
4792 that the function does not return. */
4793 if ((type_quals & TYPE_QUAL_VOLATILE)
4794 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4795 warning ("`noreturn' function returns non-void value");
4798 DECL_EXTERNAL (decl) = 1;
4799 /* Record absence of global scope for `static' or `auto'. */
4801 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4803 /* Record presence of `inline', if it is reasonable. */
4806 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4807 warning ("cannot inline function `main'");
4809 /* Assume that otherwise the function can be inlined. */
4810 DECL_INLINE (decl) = 1;
4812 if (specbits & (1 << (int) RID_EXTERN))
4813 current_extern_inline = 1;
4818 /* It's a variable. */
4819 /* An uninitialized decl with `extern' is a reference. */
4820 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4822 /* Move type qualifiers down to element of an array. */
4823 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4825 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4827 TYPE_DOMAIN (type));
4828 #if 0 /* Leave the variable const or volatile as well. */
4829 type_quals = TYPE_UNQUALIFIED;
4833 /* If this is a block level extern, it must live past the end
4834 of the function so that we can check it against other
4835 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4836 if (extern_ref && allocation_temporary_p ())
4837 end_temporary_allocation ();
4839 decl = build_decl (VAR_DECL, declarator, type);
4841 C_DECL_VARIABLE_SIZE (decl) = 1;
4844 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4846 DECL_EXTERNAL (decl) = extern_ref;
4847 /* At top level, the presence of a `static' or `register' storage
4848 class specifier, or the absence of all storage class specifiers
4849 makes this declaration a definition (perhaps tentative). Also,
4850 the absence of both `static' and `register' makes it public. */
4851 if (current_binding_level == global_binding_level)
4855 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4856 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4858 /* Not at top level, only `static' makes a static definition. */
4861 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4862 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4865 if (specbits & 1 << (int) RID_ITERATOR)
4866 ITERATOR_P (decl) = 1;
4869 /* Record `register' declaration for warnings on &
4870 and in case doing stupid register allocation. */
4872 if (specbits & (1 << (int) RID_REGISTER))
4873 DECL_REGISTER (decl) = 1;
4875 /* Record constancy and volatility. */
4876 c_apply_type_quals_to_decl (type_quals, decl);
4878 /* If a type has volatile components, it should be stored in memory.
4879 Otherwise, the fact that those components are volatile
4880 will be ignored, and would even crash the compiler. */
4881 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4882 mark_addressable (decl);
4890 /* Decode the parameter-list info for a function type or function definition.
4891 The argument is the value returned by `get_parm_info' (or made in parse.y
4892 if there is an identifier list instead of a parameter decl list).
4893 These two functions are separate because when a function returns
4894 or receives functions then each is called multiple times but the order
4895 of calls is different. The last call to `grokparms' is always the one
4896 that contains the formal parameter names of a function definition.
4898 Store in `last_function_parms' a chain of the decls of parms.
4899 Also store in `last_function_parm_tags' a chain of the struct, union,
4900 and enum tags declared among the parms.
4902 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4904 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4905 a mere declaration. A nonempty identifier-list gets an error message
4906 when FUNCDEF_FLAG is zero. */
4909 grokparms (parms_info, funcdef_flag)
4913 tree first_parm = TREE_CHAIN (parms_info);
4915 last_function_parms = TREE_PURPOSE (parms_info);
4916 last_function_parm_tags = TREE_VALUE (parms_info);
4918 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4919 && !in_system_header)
4920 warning ("function declaration isn't a prototype");
4923 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4926 pedwarn ("parameter names (without types) in function declaration");
4928 last_function_parms = first_parm;
4935 /* We no longer test FUNCDEF_FLAG.
4936 If the arg types are incomplete in a declaration,
4937 they must include undefined tags.
4938 These tags can never be defined in the scope of the declaration,
4939 so the types can never be completed,
4940 and no call can be compiled successfully. */
4942 /* In a fcn definition, arg types must be complete. */
4945 for (parm = last_function_parms, typelt = first_parm;
4947 parm = TREE_CHAIN (parm))
4948 /* Skip over any enumeration constants declared here. */
4949 if (TREE_CODE (parm) == PARM_DECL)
4951 /* Barf if the parameter itself has an incomplete type. */
4952 tree type = TREE_VALUE (typelt);
4953 if (TYPE_SIZE (type) == 0)
4955 if (funcdef_flag && DECL_NAME (parm) != 0)
4956 error ("parameter `%s' has incomplete type",
4957 IDENTIFIER_POINTER (DECL_NAME (parm)));
4959 warning ("parameter has incomplete type");
4962 TREE_VALUE (typelt) = error_mark_node;
4963 TREE_TYPE (parm) = error_mark_node;
4966 #if 0 /* This has been replaced by parm_tags_warning
4967 which uses a more accurate criterion for what to warn about. */
4970 /* Now warn if is a pointer to an incomplete type. */
4971 while (TREE_CODE (type) == POINTER_TYPE
4972 || TREE_CODE (type) == REFERENCE_TYPE)
4973 type = TREE_TYPE (type);
4974 type = TYPE_MAIN_VARIANT (type);
4975 if (TYPE_SIZE (type) == 0)
4977 if (DECL_NAME (parm) != 0)
4978 warning ("parameter `%s' points to incomplete type",
4979 IDENTIFIER_POINTER (DECL_NAME (parm)));
4981 warning ("parameter points to incomplete type");
4985 typelt = TREE_CHAIN (typelt);
4988 /* Allocate the list of types the way we allocate a type. */
4989 if (first_parm && ! TREE_PERMANENT (first_parm))
4991 /* Construct a copy of the list of types
4992 on the saveable obstack. */
4994 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4995 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4997 return nreverse (result);
5000 /* The list we have is permanent already. */
5006 /* Return a tree_list node with info on a parameter list just parsed.
5007 The TREE_PURPOSE is a chain of decls of those parms.
5008 The TREE_VALUE is a list of structure, union and enum tags defined.
5009 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5010 This tree_list node is later fed to `grokparms'.
5012 VOID_AT_END nonzero means append `void' to the end of the type-list.
5013 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5016 get_parm_info (void_at_end)
5019 register tree decl, t;
5020 register tree types = 0;
5022 tree tags = gettags ();
5023 tree parms = getdecls ();
5025 tree order = current_binding_level->parm_order;
5027 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5028 if (void_at_end && parms != 0
5029 && TREE_CHAIN (parms) == 0
5030 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5031 && DECL_NAME (parms) == 0)
5034 storedecls (NULL_TREE);
5035 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5036 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5039 /* Extract enumerator values and other non-parms declared with the parms.
5040 Likewise any forward parm decls that didn't have real parm decls. */
5041 for (decl = parms; decl; )
5043 tree next = TREE_CHAIN (decl);
5045 if (TREE_CODE (decl) != PARM_DECL)
5047 TREE_CHAIN (decl) = new_parms;
5050 else if (TREE_ASM_WRITTEN (decl))
5052 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5053 TREE_CHAIN (decl) = new_parms;
5059 /* Put the parm decls back in the order they were in in the parm list. */
5060 for (t = order; t; t = TREE_CHAIN (t))
5063 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5065 TREE_CHAIN (TREE_VALUE (t)) = 0;
5068 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5071 /* Store the parmlist in the binding level since the old one
5072 is no longer a valid list. (We have changed the chain pointers.) */
5073 storedecls (new_parms);
5075 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5076 /* There may also be declarations for enumerators if an enumeration
5077 type is declared among the parms. Ignore them here. */
5078 if (TREE_CODE (decl) == PARM_DECL)
5080 /* Since there is a prototype,
5081 args are passed in their declared types. */
5082 tree type = TREE_TYPE (decl);
5083 DECL_ARG_TYPE (decl) = type;
5084 if (PROMOTE_PROTOTYPES
5085 && (TREE_CODE (type) == INTEGER_TYPE
5086 || TREE_CODE (type) == ENUMERAL_TYPE)
5087 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5088 DECL_ARG_TYPE (decl) = integer_type_node;
5090 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5091 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5092 && DECL_NAME (decl) == 0)
5094 error ("`void' in parameter list must be the entire list");
5100 return saveable_tree_cons (new_parms, tags,
5101 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5103 return saveable_tree_cons (new_parms, tags, nreverse (types));
5106 /* At end of parameter list, warn about any struct, union or enum tags
5107 defined within. Do so because these types cannot ever become complete. */
5110 parmlist_tags_warning ()
5115 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5117 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5118 /* An anonymous union parm type is meaningful as a GNU extension.
5119 So don't warn for that. */
5120 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5122 if (TREE_PURPOSE (elt) != 0)
5123 warning ("`%s %s' declared inside parameter list",
5124 (code == RECORD_TYPE ? "struct"
5125 : code == UNION_TYPE ? "union"
5127 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5129 warning ("anonymous %s declared inside parameter list",
5130 (code == RECORD_TYPE ? "struct"
5131 : code == UNION_TYPE ? "union"
5136 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5142 /* Get the struct, enum or union (CODE says which) with tag NAME.
5143 Define the tag as a forward-reference if it is not defined. */
5146 xref_tag (code, name)
5147 enum tree_code code;
5150 int temporary = allocation_temporary_p ();
5152 /* If a cross reference is requested, look up the type
5153 already defined for this tag and return it. */
5155 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5156 /* Even if this is the wrong type of tag, return what we found.
5157 There will be an error message anyway, from pending_xref_error.
5158 If we create an empty xref just for an invalid use of the type,
5159 the main result is to create lots of superfluous error messages. */
5163 push_obstacks_nochange ();
5165 if (current_binding_level == global_binding_level && temporary)
5166 end_temporary_allocation ();
5168 /* If no such tag is yet defined, create a forward-reference node
5169 and record it as the "definition".
5170 When a real declaration of this type is found,
5171 the forward-reference will be altered into a real type. */
5173 ref = make_node (code);
5174 if (code == ENUMERAL_TYPE)
5176 /* (In ANSI, Enums can be referred to only if already defined.) */
5178 pedwarn ("ANSI C forbids forward references to `enum' types");
5179 /* Give the type a default layout like unsigned int
5180 to avoid crashing if it does not get defined. */
5181 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5182 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5183 TREE_UNSIGNED (ref) = 1;
5184 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5185 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5186 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5189 pushtag (name, ref);
5196 /* Make sure that the tag NAME is defined *in the current binding level*
5197 at least as a forward reference.
5198 CODE says which kind of tag NAME ought to be.
5200 We also do a push_obstacks_nochange
5201 whose matching pop is in finish_struct. */
5204 start_struct (code, name)
5205 enum tree_code code;
5208 /* If there is already a tag defined at this binding level
5209 (as a forward reference), just return it. */
5211 register tree ref = 0;
5213 push_obstacks_nochange ();
5214 if (current_binding_level == global_binding_level)
5215 end_temporary_allocation ();
5218 ref = lookup_tag (code, name, current_binding_level, 1);
5219 if (ref && TREE_CODE (ref) == code)
5221 C_TYPE_BEING_DEFINED (ref) = 1;
5222 TYPE_PACKED (ref) = flag_pack_struct;
5223 if (TYPE_FIELDS (ref))
5224 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5225 : "redefinition of `struct %s'"),
5226 IDENTIFIER_POINTER (name));
5231 /* Otherwise create a forward-reference just so the tag is in scope. */
5233 ref = make_node (code);
5234 pushtag (name, ref);
5235 C_TYPE_BEING_DEFINED (ref) = 1;
5236 TYPE_PACKED (ref) = flag_pack_struct;
5240 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5241 of a structure component, returning a FIELD_DECL node.
5242 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5244 This is done during the parsing of the struct declaration.
5245 The FIELD_DECL nodes are chained together and the lot of them
5246 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5249 grokfield (filename, line, declarator, declspecs, width)
5250 const char *filename ATTRIBUTE_UNUSED;
5251 int line ATTRIBUTE_UNUSED;
5252 tree declarator, declspecs, width;
5256 /* The corresponding pop_obstacks is in finish_decl. */
5257 push_obstacks_nochange ();
5259 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5261 finish_decl (value, NULL_TREE, NULL_TREE);
5262 DECL_INITIAL (value) = width;
5264 maybe_objc_check_decl (value);
5268 /* Function to help qsort sort FIELD_DECLs by name order. */
5271 field_decl_cmp (xp, yp)
5275 tree *x = (tree *)xp, *y = (tree *)yp;
5277 if (DECL_NAME (*x) == DECL_NAME (*y))
5279 if (DECL_NAME (*x) == NULL)
5281 if (DECL_NAME (*y) == NULL)
5283 if (DECL_NAME (*x) < DECL_NAME (*y))
5288 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5289 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5290 ATTRIBUTES are attributes to be applied to the structure.
5292 We also do a pop_obstacks to match the push in start_struct. */
5295 finish_struct (t, fieldlist, attributes)
5302 int toplevel = global_binding_level == current_binding_level;
5304 /* If this type was previously laid out as a forward reference,
5305 make sure we lay it out again. */
5309 decl_attributes (t, attributes, NULL_TREE);
5311 /* Nameless union parm types are useful as GCC extension. */
5312 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5313 /* Otherwise, warn about any struct or union def. in parmlist. */
5314 if (in_parm_level_p ())
5317 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5318 : "structure defined inside parms"));
5319 else if (! flag_traditional)
5320 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5321 : "structure defined inside parms"));
5324 old_momentary = suspend_momentary ();
5328 for (x = fieldlist; x; x = TREE_CHAIN (x))
5329 if (DECL_NAME (x) != 0)
5334 ? "%s has no named members"
5335 : "%s has no members"),
5336 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5339 /* Install struct as DECL_CONTEXT of each field decl.
5340 Also process specified field sizes.
5341 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5342 The specified size is found in the DECL_INITIAL.
5343 Store 0 there, except for ": 0" fields (so we can find them
5344 and delete them, below). */
5346 for (x = fieldlist; x; x = TREE_CHAIN (x))
5348 DECL_CONTEXT (x) = t;
5349 DECL_PACKED (x) |= TYPE_PACKED (t);
5350 DECL_FIELD_SIZE (x) = 0;
5352 /* If any field is const, the structure type is pseudo-const. */
5353 if (TREE_READONLY (x))
5354 C_TYPE_FIELDS_READONLY (t) = 1;
5357 /* A field that is pseudo-const makes the structure likewise. */
5358 tree t1 = TREE_TYPE (x);
5359 while (TREE_CODE (t1) == ARRAY_TYPE)
5360 t1 = TREE_TYPE (t1);
5361 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5362 && C_TYPE_FIELDS_READONLY (t1))
5363 C_TYPE_FIELDS_READONLY (t) = 1;
5366 /* Any field that is volatile means variables of this type must be
5367 treated in some ways as volatile. */
5368 if (TREE_THIS_VOLATILE (x))
5369 C_TYPE_FIELDS_VOLATILE (t) = 1;
5371 /* Any field of nominal variable size implies structure is too. */
5372 if (C_DECL_VARIABLE_SIZE (x))
5373 C_TYPE_VARIABLE_SIZE (t) = 1;
5375 /* Detect invalid nested redefinition. */
5376 if (TREE_TYPE (x) == t)
5377 error ("nested redefinition of `%s'",
5378 IDENTIFIER_POINTER (TYPE_NAME (t)));
5380 /* Detect invalid bit-field size. */
5381 if (DECL_INITIAL (x))
5382 STRIP_NOPS (DECL_INITIAL (x));
5383 if (DECL_INITIAL (x))
5385 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5386 constant_expression_warning (DECL_INITIAL (x));
5389 error_with_decl (x, "bit-field `%s' width not an integer constant");
5390 DECL_INITIAL (x) = NULL;
5394 /* Detect invalid bit-field type. */
5395 if (DECL_INITIAL (x)
5396 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5397 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5399 error_with_decl (x, "bit-field `%s' has invalid type");
5400 DECL_INITIAL (x) = NULL;
5402 if (DECL_INITIAL (x) && pedantic
5403 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5404 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5405 /* Accept an enum that's equivalent to int or unsigned int. */
5406 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5407 && (TYPE_PRECISION (TREE_TYPE (x))
5408 == TYPE_PRECISION (integer_type_node))))
5409 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5411 /* Detect and ignore out of range field width. */
5412 if (DECL_INITIAL (x))
5414 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5416 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5418 DECL_INITIAL (x) = NULL;
5419 error_with_decl (x, "negative width in bit-field `%s'");
5421 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5422 || width > TYPE_PRECISION (TREE_TYPE (x)))
5424 DECL_INITIAL (x) = NULL;
5425 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5427 else if (width == 0 && DECL_NAME (x) != 0)
5429 error_with_decl (x, "zero width for bit-field `%s'");
5430 DECL_INITIAL (x) = NULL;
5434 /* Process valid field width. */
5435 if (DECL_INITIAL (x))
5437 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5439 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5440 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5441 TREE_UNSIGNED (TREE_TYPE (x)))
5442 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5443 TREE_UNSIGNED (TREE_TYPE (x)))))
5444 warning_with_decl (x, "`%s' is narrower than values of its type");
5446 DECL_FIELD_SIZE (x) = width;
5447 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5448 DECL_INITIAL (x) = NULL;
5452 /* field size 0 => force desired amount of alignment. */
5453 #ifdef EMPTY_FIELD_BOUNDARY
5454 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5456 #ifdef PCC_BITFIELD_TYPE_MATTERS
5457 if (PCC_BITFIELD_TYPE_MATTERS)
5458 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5459 TYPE_ALIGN (TREE_TYPE (x)));
5463 else if (TREE_TYPE (x) != error_mark_node)
5465 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5466 : TYPE_ALIGN (TREE_TYPE (x)));
5467 /* Non-bit-fields are aligned for their type, except packed
5468 fields which require only BITS_PER_UNIT alignment. */
5469 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5473 /* Now DECL_INITIAL is null on all members. */
5475 /* Delete all duplicate fields from the fieldlist */
5476 for (x = fieldlist; x && TREE_CHAIN (x);)
5477 /* Anonymous fields aren't duplicates. */
5478 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5482 register tree y = fieldlist;
5486 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5492 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5494 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5495 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5497 else x = TREE_CHAIN (x);
5500 /* Now we have the nearly final fieldlist. Record it,
5501 then lay out the structure or union (including the fields). */
5503 TYPE_FIELDS (t) = fieldlist;
5507 /* Delete all zero-width bit-fields from the front of the fieldlist */
5509 && DECL_INITIAL (fieldlist))
5510 fieldlist = TREE_CHAIN (fieldlist);
5511 /* Delete all such members from the rest of the fieldlist */
5512 for (x = fieldlist; x;)
5514 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5515 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5516 else x = TREE_CHAIN (x);
5519 /* Now we have the truly final field list.
5520 Store it in this type and in the variants. */
5522 TYPE_FIELDS (t) = fieldlist;
5524 /* If there are lots of fields, sort so we can look through them fast.
5525 We arbitrarily consider 16 or more elts to be "a lot". */
5529 for (x = fieldlist; x; x = TREE_CHAIN (x))
5540 len += list_length (x);
5541 /* Use the same allocation policy here that make_node uses, to
5542 ensure that this lives as long as the rest of the struct decl.
5543 All decls in an inline function need to be saved. */
5545 space = ggc_alloc (sizeof (struct lang_type) + len * sizeof (tree));
5546 else if (allocation_temporary_p ())
5547 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5549 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5551 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5552 TYPE_LANG_SPECIFIC (t)->len = len;
5554 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5556 for (x = fieldlist; x; x = TREE_CHAIN (x))
5557 field_array[len++] = x;
5559 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5563 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5565 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5566 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5567 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5570 /* If this was supposed to be a transparent union, but we can't
5571 make it one, warn and turn off the flag. */
5572 if (TREE_CODE (t) == UNION_TYPE
5573 && TYPE_TRANSPARENT_UNION (t)
5574 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5576 TYPE_TRANSPARENT_UNION (t) = 0;
5577 warning ("union cannot be made transparent");
5580 /* If this structure or union completes the type of any previous
5581 variable declaration, lay it out and output its rtl. */
5583 if (current_binding_level->n_incomplete != 0)
5586 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5588 if (TREE_TYPE (decl) == t
5589 && TREE_CODE (decl) != TYPE_DECL)
5591 layout_decl (decl, 0);
5592 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5593 maybe_objc_check_decl (decl);
5594 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5597 --current_binding_level->n_incomplete;
5599 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5600 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5602 tree element = TREE_TYPE (decl);
5603 while (TREE_CODE (element) == ARRAY_TYPE)
5604 element = TREE_TYPE (element);
5606 layout_array_type (TREE_TYPE (decl));
5611 resume_momentary (old_momentary);
5613 /* Finish debugging output for this type. */
5614 rest_of_type_compilation (t, toplevel);
5616 /* The matching push is in start_struct. */
5622 /* Lay out the type T, and its element type, and so on. */
5625 layout_array_type (t)
5628 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5629 layout_array_type (TREE_TYPE (t));
5633 /* Begin compiling the definition of an enumeration type.
5634 NAME is its name (or null if anonymous).
5635 Returns the type object, as yet incomplete.
5636 Also records info about it so that build_enumerator
5637 may be used to declare the individual values as they are read. */
5643 register tree enumtype = 0;
5645 /* If this is the real definition for a previous forward reference,
5646 fill in the contents in the same object that used to be the
5647 forward reference. */
5650 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5652 /* The corresponding pop_obstacks is in finish_enum. */
5653 push_obstacks_nochange ();
5654 /* If these symbols and types are global, make them permanent. */
5655 if (current_binding_level == global_binding_level)
5656 end_temporary_allocation ();
5658 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5660 enumtype = make_node (ENUMERAL_TYPE);
5661 pushtag (name, enumtype);
5664 C_TYPE_BEING_DEFINED (enumtype) = 1;
5666 if (TYPE_VALUES (enumtype) != 0)
5668 /* This enum is a named one that has been declared already. */
5669 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5671 /* Completely replace its old definition.
5672 The old enumerators remain defined, however. */
5673 TYPE_VALUES (enumtype) = 0;
5676 enum_next_value = integer_zero_node;
5679 if (flag_short_enums)
5680 TYPE_PACKED (enumtype) = 1;
5685 /* After processing and defining all the values of an enumeration type,
5686 install their decls in the enumeration type and finish it off.
5687 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5688 and ATTRIBUTES are the specified attributes.
5689 Returns ENUMTYPE. */
5692 finish_enum (enumtype, values, attributes)
5697 register tree pair, tem;
5698 tree minnode = 0, maxnode = 0;
5699 int lowprec, highprec, precision;
5700 int toplevel = global_binding_level == current_binding_level;
5702 if (in_parm_level_p ())
5703 warning ("enum defined inside parms");
5705 decl_attributes (enumtype, attributes, NULL_TREE);
5707 /* Calculate the maximum value of any enumerator in this type. */
5709 if (values == error_mark_node)
5710 minnode = maxnode = integer_zero_node;
5712 for (pair = values; pair; pair = TREE_CHAIN (pair))
5714 tree value = TREE_VALUE (pair);
5716 minnode = maxnode = TREE_VALUE (pair);
5719 if (tree_int_cst_lt (maxnode, value))
5721 if (tree_int_cst_lt (value, minnode))
5726 TYPE_MIN_VALUE (enumtype) = minnode;
5727 TYPE_MAX_VALUE (enumtype) = maxnode;
5729 /* An enum can have some negative values; then it is signed. */
5730 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5732 /* Determine the precision this type needs. */
5734 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5735 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5736 precision = MAX (lowprec, highprec);
5738 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5740 tree narrowest = type_for_size (precision, 1);
5743 warning ("enumeration values exceed range of largest integer");
5744 narrowest = long_long_integer_type_node;
5747 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5750 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5752 TYPE_SIZE (enumtype) = 0;
5753 layout_type (enumtype);
5755 if (values != error_mark_node)
5757 /* Change the type of the enumerators to be the enum type.
5758 Formerly this was done only for enums that fit in an int,
5759 but the comment said it was done only for enums wider than int.
5760 It seems necessary to do this for wide enums,
5761 and best not to change what's done for ordinary narrower ones. */
5762 for (pair = values; pair; pair = TREE_CHAIN (pair))
5764 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5765 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5766 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5767 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5770 /* Replace the decl nodes in VALUES with their names. */
5771 for (pair = values; pair; pair = TREE_CHAIN (pair))
5772 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5774 TYPE_VALUES (enumtype) = values;
5777 /* Fix up all variant types of this enum type. */
5778 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5780 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5781 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5782 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5783 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5784 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5785 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5786 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5787 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5788 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5791 /* Finish debugging output for this type. */
5792 rest_of_type_compilation (enumtype, toplevel);
5794 /* This matches a push in start_enum. */
5800 /* Build and install a CONST_DECL for one value of the
5801 current enumeration type (one that was begun with start_enum).
5802 Return a tree-list containing the CONST_DECL and its value.
5803 Assignment of sequential values by default is handled here. */
5806 build_enumerator (name, value)
5809 register tree decl, type;
5811 /* Validate and default VALUE. */
5813 /* Remove no-op casts from the value. */
5815 STRIP_TYPE_NOPS (value);
5819 if (TREE_CODE (value) == INTEGER_CST)
5821 value = default_conversion (value);
5822 constant_expression_warning (value);
5826 error ("enumerator value for `%s' not integer constant",
5827 IDENTIFIER_POINTER (name));
5832 /* Default based on previous value. */
5833 /* It should no longer be possible to have NON_LVALUE_EXPR
5837 value = enum_next_value;
5839 error ("overflow in enumeration values");
5842 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5844 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5845 value = integer_zero_node;
5848 /* Set basis for default for next value. */
5849 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5850 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5852 /* Now create a declaration for the enum value name. */
5854 type = TREE_TYPE (value);
5855 type = type_for_size (MAX (TYPE_PRECISION (type),
5856 TYPE_PRECISION (integer_type_node)),
5858 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5859 && TREE_UNSIGNED (type)));
5861 decl = build_decl (CONST_DECL, name, type);
5862 DECL_INITIAL (decl) = value;
5863 TREE_TYPE (value) = type;
5866 return saveable_tree_cons (decl, value, NULL_TREE);
5869 /* Create the FUNCTION_DECL for a function definition.
5870 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5871 the declaration; they describe the function's name and the type it returns,
5872 but twisted together in a fashion that parallels the syntax of C.
5874 This function creates a binding context for the function body
5875 as well as setting up the FUNCTION_DECL in current_function_decl.
5877 Returns 1 on success. If the DECLARATOR is not suitable for a function
5878 (it defines a datum instead), we return 0, which tells
5879 yyparse to report a parse error.
5881 NESTED is nonzero for a function nested within another function. */
5884 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
5885 tree declarator, declspecs, prefix_attributes, attributes;
5888 tree decl1, old_decl;
5890 int old_immediate_size_expand = immediate_size_expand;
5892 current_function_returns_value = 0; /* Assume, until we see it does. */
5893 current_function_returns_null = 0;
5894 warn_about_return_type = 0;
5895 current_extern_inline = 0;
5896 c_function_varargs = 0;
5898 shadowed_labels = 0;
5900 /* Don't expand any sizes in the return type of the function. */
5901 immediate_size_expand = 0;
5903 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5905 /* If the declarator is not suitable for a function definition,
5906 cause a syntax error. */
5909 immediate_size_expand = old_immediate_size_expand;
5913 decl_attributes (decl1, prefix_attributes, attributes);
5915 announce_function (decl1);
5917 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5919 error ("return-type is an incomplete type");
5920 /* Make it return void instead. */
5922 = build_function_type (void_type_node,
5923 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5926 if (warn_about_return_type)
5927 warning ("return-type defaults to `int'");
5929 /* Save the parm names or decls from this function's declarator
5930 where store_parm_decls will find them. */
5931 current_function_parms = last_function_parms;
5932 current_function_parm_tags = last_function_parm_tags;
5934 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5935 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5936 DECL_INITIAL (decl1) = error_mark_node;
5938 /* If this definition isn't a prototype and we had a prototype declaration
5939 before, copy the arg type info from that prototype.
5940 But not if what we had before was a builtin function. */
5941 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5942 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5943 && !DECL_BUILT_IN (old_decl)
5944 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5945 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5946 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5948 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5949 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5950 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5953 /* If there is no explicit declaration, look for any out-of-scope implicit
5956 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5958 /* Optionally warn of old-fashioned def with no previous prototype. */
5959 if (warn_strict_prototypes
5960 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5961 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5962 warning ("function declaration isn't a prototype");
5963 /* Optionally warn of any global def with no previous prototype. */
5964 else if (warn_missing_prototypes
5965 && TREE_PUBLIC (decl1)
5966 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5967 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5968 warning_with_decl (decl1, "no previous prototype for `%s'");
5969 /* Optionally warn of any def with no previous prototype
5970 if the function has already been used. */
5971 else if (warn_missing_prototypes
5972 && old_decl != 0 && TREE_USED (old_decl)
5973 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5974 warning_with_decl (decl1,
5975 "`%s' was used with no prototype before its definition");
5976 /* Optionally warn of any global def with no previous declaration. */
5977 else if (warn_missing_declarations
5978 && TREE_PUBLIC (decl1)
5980 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5981 warning_with_decl (decl1, "no previous declaration for `%s'");
5982 /* Optionally warn of any def with no previous declaration
5983 if the function has already been used. */
5984 else if (warn_missing_declarations
5985 && old_decl != 0 && TREE_USED (old_decl)
5986 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5987 warning_with_decl (decl1,
5988 "`%s' was used with no declaration before its definition");
5990 /* This is a definition, not a reference.
5991 So normally clear DECL_EXTERNAL.
5992 However, `extern inline' acts like a declaration
5993 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5994 DECL_EXTERNAL (decl1) = current_extern_inline;
5996 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5997 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6000 /* This function exists in static storage.
6001 (This does not mean `static' in the C sense!) */
6002 TREE_STATIC (decl1) = 1;
6004 /* A nested function is not global. */
6005 if (current_function_decl != 0)
6006 TREE_PUBLIC (decl1) = 0;
6008 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6010 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6015 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6016 != integer_type_node)
6017 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6019 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6020 args = TREE_CHAIN (args))
6022 tree type = args ? TREE_VALUE (args) : 0;
6024 if (type == void_type_node)
6031 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6032 pedwarn_with_decl (decl1,
6033 "first argument of `%s' should be `int'");
6037 if (TREE_CODE (type) != POINTER_TYPE
6038 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6039 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6041 pedwarn_with_decl (decl1,
6042 "second argument of `%s' should be `char **'");
6046 if (TREE_CODE (type) != POINTER_TYPE
6047 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6048 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6050 pedwarn_with_decl (decl1,
6051 "third argument of `%s' should probably be `char **'");
6056 /* It is intentional that this message does not mention the third
6057 argument, which is warned for only pedantically, because it's
6058 blessed by mention in an appendix of the standard. */
6059 if (argct > 0 && (argct < 2 || argct > 3))
6060 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6062 if (argct == 3 && pedantic)
6063 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6065 if (! TREE_PUBLIC (decl1))
6066 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6069 /* Record the decl so that the function name is defined.
6070 If we already have a decl for this name, and it is a FUNCTION_DECL,
6071 use the old decl. */
6073 current_function_decl = pushdecl (decl1);
6076 declare_parm_level (1);
6077 current_binding_level->subblocks_tag_transparent = 1;
6079 make_function_rtl (current_function_decl);
6081 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6082 /* Promote the value to int before returning it. */
6083 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6085 /* It retains unsignedness if traditional
6086 or if not really getting wider. */
6087 if (TREE_UNSIGNED (restype)
6088 && (flag_traditional
6089 || (TYPE_PRECISION (restype)
6090 == TYPE_PRECISION (integer_type_node))))
6091 restype = unsigned_type_node;
6093 restype = integer_type_node;
6095 DECL_RESULT (current_function_decl)
6096 = build_decl (RESULT_DECL, NULL_TREE, restype);
6099 /* Allocate further tree nodes temporarily during compilation
6100 of this function only. */
6101 temporary_allocation ();
6103 /* If this fcn was already referenced via a block-scope `extern' decl
6104 (or an implicit decl), propagate certain information about the usage. */
6105 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6106 TREE_ADDRESSABLE (current_function_decl) = 1;
6108 immediate_size_expand = old_immediate_size_expand;
6113 /* Record that this function is going to be a varargs function.
6114 This is called before store_parm_decls, which is too early
6115 to call mark_varargs directly. */
6120 c_function_varargs = 1;
6123 /* Store the parameter declarations into the current function declaration.
6124 This is called after parsing the parameter declarations, before
6125 digesting the body of the function.
6127 For an old-style definition, modify the function's type
6128 to specify at least the number of arguments. */
6133 register tree fndecl = current_function_decl;
6136 /* This is either a chain of PARM_DECLs (if a prototype was used)
6137 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6138 tree specparms = current_function_parms;
6140 /* This is a list of types declared among parms in a prototype. */
6141 tree parmtags = current_function_parm_tags;
6143 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6144 register tree parmdecls = getdecls ();
6146 /* This is a chain of any other decls that came in among the parm
6147 declarations. If a parm is declared with enum {foo, bar} x;
6148 then CONST_DECLs for foo and bar are put here. */
6151 /* Nonzero if this definition is written with a prototype. */
6154 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6156 /* This case is when the function was defined with an ANSI prototype.
6157 The parms already have decls, so we need not do anything here
6158 except record them as in effect
6159 and complain if any redundant old-style parm decls were written. */
6170 error_with_decl (fndecl,
6171 "parm types given both in parmlist and separately");
6172 /* Get rid of the erroneous decls; don't keep them on
6173 the list of parms, since they might not be PARM_DECLs. */
6174 for (decl = current_binding_level->names;
6175 decl; decl = TREE_CHAIN (decl))
6176 if (DECL_NAME (decl))
6177 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6178 for (link = current_binding_level->shadowed;
6179 link; link = TREE_CHAIN (link))
6180 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6181 current_binding_level->names = 0;
6182 current_binding_level->shadowed = 0;
6185 specparms = nreverse (specparms);
6186 for (parm = specparms; parm; parm = next)
6188 next = TREE_CHAIN (parm);
6189 if (TREE_CODE (parm) == PARM_DECL)
6191 if (DECL_NAME (parm) == 0)
6192 error_with_decl (parm, "parameter name omitted");
6193 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6195 error_with_decl (parm, "parameter `%s' declared void");
6196 /* Change the type to error_mark_node so this parameter
6197 will be ignored by assign_parms. */
6198 TREE_TYPE (parm) = error_mark_node;
6204 /* If we find an enum constant or a type tag,
6205 put it aside for the moment. */
6206 TREE_CHAIN (parm) = 0;
6207 others = chainon (others, parm);
6211 /* Get the decls in their original chain order
6212 and record in the function. */
6213 DECL_ARGUMENTS (fndecl) = getdecls ();
6216 /* If this function takes a variable number of arguments,
6217 add a phony parameter to the end of the parm list,
6218 to represent the position of the first unnamed argument. */
6219 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6222 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6223 /* Let's hope the address of the unnamed parm
6224 won't depend on its type. */
6225 TREE_TYPE (dummy) = integer_type_node;
6226 DECL_ARG_TYPE (dummy) = integer_type_node;
6227 DECL_ARGUMENTS (fndecl)
6228 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6232 /* Now pushdecl the enum constants. */
6233 for (parm = others; parm; parm = next)
6235 next = TREE_CHAIN (parm);
6236 if (DECL_NAME (parm) == 0)
6238 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6240 else if (TREE_CODE (parm) != PARM_DECL)
6244 storetags (chainon (parmtags, gettags ()));
6248 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6249 each with a parm name as the TREE_VALUE.
6251 PARMDECLS is a chain of declarations for parameters.
6252 Warning! It can also contain CONST_DECLs which are not parameters
6253 but are names of enumerators of any enum types
6254 declared among the parameters.
6256 First match each formal parameter name with its declaration.
6257 Associate decls with the names and store the decls
6258 into the TREE_PURPOSE slots. */
6260 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6261 DECL_RESULT (parm) = 0;
6263 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6265 register tree tail, found = NULL;
6267 if (TREE_VALUE (parm) == 0)
6269 error_with_decl (fndecl, "parameter name missing from parameter list");
6270 TREE_PURPOSE (parm) = 0;
6274 /* See if any of the parmdecls specifies this parm by name.
6275 Ignore any enumerator decls. */
6276 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6277 if (DECL_NAME (tail) == TREE_VALUE (parm)
6278 && TREE_CODE (tail) == PARM_DECL)
6284 /* If declaration already marked, we have a duplicate name.
6285 Complain, and don't use this decl twice. */
6286 if (found && DECL_RESULT (found) != 0)
6288 error_with_decl (found, "multiple parameters named `%s'");
6292 /* If the declaration says "void", complain and ignore it. */
6293 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6295 error_with_decl (found, "parameter `%s' declared void");
6296 TREE_TYPE (found) = integer_type_node;
6297 DECL_ARG_TYPE (found) = integer_type_node;
6298 layout_decl (found, 0);
6301 /* Traditionally, a parm declared float is actually a double. */
6302 if (found && flag_traditional
6303 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6305 TREE_TYPE (found) = double_type_node;
6306 DECL_ARG_TYPE (found) = double_type_node;
6307 layout_decl (found, 0);
6310 /* If no declaration found, default to int. */
6313 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6315 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6316 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6317 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6319 warning_with_decl (found, "type of `%s' defaults to `int'");
6323 TREE_PURPOSE (parm) = found;
6325 /* Mark this decl as "already found" -- see test, above.
6326 It is safe to use DECL_RESULT for this
6327 since it is not used in PARM_DECLs or CONST_DECLs. */
6328 DECL_RESULT (found) = error_mark_node;
6331 /* Put anything which is on the parmdecls chain and which is
6332 not a PARM_DECL onto the list NONPARMS. (The types of
6333 non-parm things which might appear on the list include
6334 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6335 any actual PARM_DECLs not matched with any names. */
6338 for (parm = parmdecls; parm; )
6340 tree next = TREE_CHAIN (parm);
6341 TREE_CHAIN (parm) = 0;
6343 if (TREE_CODE (parm) != PARM_DECL)
6344 nonparms = chainon (nonparms, parm);
6347 /* Complain about args with incomplete types. */
6348 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6350 error_with_decl (parm, "parameter `%s' has incomplete type");
6351 TREE_TYPE (parm) = error_mark_node;
6354 if (DECL_RESULT (parm) == 0)
6356 error_with_decl (parm,
6357 "declaration for parameter `%s' but no such parameter");
6358 /* Pretend the parameter was not missing.
6359 This gets us to a standard state and minimizes
6360 further error messages. */
6362 = chainon (specparms,
6363 tree_cons (parm, NULL_TREE, NULL_TREE));
6370 /* Chain the declarations together in the order of the list of names. */
6371 /* Store that chain in the function decl, replacing the list of names. */
6373 DECL_ARGUMENTS (fndecl) = 0;
6376 for (last = 0; parm; parm = TREE_CHAIN (parm))
6377 if (TREE_PURPOSE (parm))
6380 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6382 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6383 last = TREE_PURPOSE (parm);
6384 TREE_CHAIN (last) = 0;
6388 /* If there was a previous prototype,
6389 set the DECL_ARG_TYPE of each argument according to
6390 the type previously specified, and report any mismatches. */
6392 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6395 for (parm = DECL_ARGUMENTS (fndecl),
6396 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6397 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6398 != void_type_node));
6399 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6401 if (parm == 0 || type == 0
6402 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6404 error ("number of arguments doesn't match prototype");
6405 error_with_file_and_line (current_function_prototype_file,
6406 current_function_prototype_line,
6407 "prototype declaration");
6410 /* Type for passing arg must be consistent
6411 with that declared for the arg. */
6412 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6414 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6415 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6417 /* Adjust argument to match prototype. E.g. a previous
6418 `int foo(float);' prototype causes
6419 `int foo(x) float x; {...}' to be treated like
6420 `int foo(float x) {...}'. This is particularly
6421 useful for argument types like uid_t. */
6422 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6424 if (PROMOTE_PROTOTYPES
6425 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6426 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6427 && TYPE_PRECISION (TREE_TYPE (parm))
6428 < TYPE_PRECISION (integer_type_node))
6429 DECL_ARG_TYPE (parm) = integer_type_node;
6433 pedwarn ("promoted argument `%s' doesn't match prototype",
6434 IDENTIFIER_POINTER (DECL_NAME (parm)));
6435 warning_with_file_and_line
6436 (current_function_prototype_file,
6437 current_function_prototype_line,
6438 "prototype declaration");
6441 /* If -traditional, allow `int' argument to match
6442 `unsigned' prototype. */
6443 else if (! (flag_traditional
6444 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6445 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6447 error ("argument `%s' doesn't match prototype",
6448 IDENTIFIER_POINTER (DECL_NAME (parm)));
6449 error_with_file_and_line (current_function_prototype_file,
6450 current_function_prototype_line,
6451 "prototype declaration");
6455 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6458 /* Otherwise, create a prototype that would match. */
6462 tree actual = 0, last = 0, type;
6464 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6466 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6469 TREE_CHAIN (last) = type;
6474 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6476 TREE_CHAIN (last) = type;
6480 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6481 of the type of this function, but we need to avoid having this
6482 affect the types of other similarly-typed functions, so we must
6483 first force the generation of an identical (but separate) type
6484 node for the relevant function type. The new node we create
6485 will be a variant of the main variant of the original function
6488 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6490 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6493 /* Now store the final chain of decls for the arguments
6494 as the decl-chain of the current lexical scope.
6495 Put the enumerators in as well, at the front so that
6496 DECL_ARGUMENTS is not modified. */
6498 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6501 /* Make sure the binding level for the top of the function body
6502 gets a BLOCK if there are any in the function.
6503 Otherwise, the dbx output is wrong. */
6505 keep_next_if_subblocks = 1;
6507 /* ??? This might be an improvement,
6508 but needs to be thought about some more. */
6510 keep_next_level_flag = 1;
6513 /* Write a record describing this function definition to the prototypes
6514 file (if requested). */
6516 gen_aux_info_record (fndecl, 1, 0, prototype);
6518 /* Initialize the RTL code for the function. */
6520 init_function_start (fndecl, input_filename, lineno);
6522 /* If this is a varargs function, inform function.c. */
6524 if (c_function_varargs)
6527 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6529 declare_function_name ();
6531 /* Set up parameters and prepare for return, for the function. */
6533 expand_function_start (fndecl, 0);
6535 /* If this function is `main', emit a call to `__main'
6536 to run global initializers, etc. */
6537 if (DECL_NAME (fndecl)
6538 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6539 && DECL_CONTEXT (fndecl) == NULL_TREE)
6540 expand_main_function ();
6543 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6544 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6545 stands for an ellipsis in the identifier list.
6547 PARMLIST is the data returned by get_parm_info for the
6548 parmlist that follows the semicolon.
6550 We return a value of the same sort that get_parm_info returns,
6551 except that it describes the combination of identifiers and parmlist. */
6554 combine_parm_decls (specparms, parmlist, void_at_end)
6555 tree specparms, parmlist;
6558 register tree fndecl = current_function_decl;
6561 tree parmdecls = TREE_PURPOSE (parmlist);
6563 /* This is a chain of any other decls that came in among the parm
6564 declarations. They were separated already by get_parm_info,
6565 so we just need to keep them separate. */
6566 tree nonparms = TREE_VALUE (parmlist);
6570 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6571 DECL_RESULT (parm) = 0;
6573 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6575 register tree tail, found = NULL;
6577 /* See if any of the parmdecls specifies this parm by name. */
6578 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6579 if (DECL_NAME (tail) == TREE_VALUE (parm))
6585 /* If declaration already marked, we have a duplicate name.
6586 Complain, and don't use this decl twice. */
6587 if (found && DECL_RESULT (found) != 0)
6589 error_with_decl (found, "multiple parameters named `%s'");
6593 /* If the declaration says "void", complain and ignore it. */
6594 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6596 error_with_decl (found, "parameter `%s' declared void");
6597 TREE_TYPE (found) = integer_type_node;
6598 DECL_ARG_TYPE (found) = integer_type_node;
6599 layout_decl (found, 0);
6602 /* Traditionally, a parm declared float is actually a double. */
6603 if (found && flag_traditional
6604 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6606 TREE_TYPE (found) = double_type_node;
6607 DECL_ARG_TYPE (found) = double_type_node;
6608 layout_decl (found, 0);
6611 /* If no declaration found, default to int. */
6614 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6616 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6617 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6618 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6619 error_with_decl (found, "type of parameter `%s' is not declared");
6623 TREE_PURPOSE (parm) = found;
6625 /* Mark this decl as "already found" -- see test, above.
6626 It is safe to use DECL_RESULT for this
6627 since it is not used in PARM_DECLs or CONST_DECLs. */
6628 DECL_RESULT (found) = error_mark_node;
6631 /* Complain about any actual PARM_DECLs not matched with any names. */
6633 for (parm = parmdecls; parm; )
6635 tree next = TREE_CHAIN (parm);
6636 TREE_CHAIN (parm) = 0;
6638 /* Complain about args with incomplete types. */
6639 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6641 error_with_decl (parm, "parameter `%s' has incomplete type");
6642 TREE_TYPE (parm) = error_mark_node;
6645 if (DECL_RESULT (parm) == 0)
6647 error_with_decl (parm,
6648 "declaration for parameter `%s' but no such parameter");
6649 /* Pretend the parameter was not missing.
6650 This gets us to a standard state and minimizes
6651 further error messages. */
6653 = chainon (specparms,
6654 tree_cons (parm, NULL_TREE, NULL_TREE));
6660 /* Chain the declarations together in the order of the list of names.
6661 At the same time, build up a list of their types, in reverse order. */
6667 for (last = 0; parm; parm = TREE_CHAIN (parm))
6668 if (TREE_PURPOSE (parm))
6671 parmdecls = TREE_PURPOSE (parm);
6673 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6674 last = TREE_PURPOSE (parm);
6675 TREE_CHAIN (last) = 0;
6677 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6682 return saveable_tree_cons (parmdecls, nonparms,
6683 nreverse (saveable_tree_cons (NULL_TREE,
6687 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6690 /* Finish up a function declaration and compile that function
6691 all the way to assembler language output. The free the storage
6692 for the function definition.
6694 This is called after parsing the body of the function definition.
6696 NESTED is nonzero if the function being finished is nested in another. */
6699 finish_function (nested)
6702 register tree fndecl = current_function_decl;
6704 /* TREE_READONLY (fndecl) = 1;
6705 This caused &foo to be of type ptr-to-const-function
6706 which then got a warning when stored in a ptr-to-function variable. */
6709 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6711 /* Must mark the RESULT_DECL as being in this function. */
6713 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6715 /* Obey `register' declarations if `setjmp' is called in this fn. */
6716 if (flag_traditional && current_function_calls_setjmp)
6718 setjmp_protect (DECL_INITIAL (fndecl));
6719 setjmp_protect_args ();
6722 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6724 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6725 != integer_type_node)
6727 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6728 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6730 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6734 #ifdef DEFAULT_MAIN_RETURN
6735 /* Make it so that `main' always returns success by default. */
6736 DEFAULT_MAIN_RETURN;
6741 /* Generate rtl for function exit. */
6742 expand_function_end (input_filename, lineno, 0);
6744 /* So we can tell if jump_optimize sets it to 1. */
6747 /* If this is a nested function, protect the local variables in the stack
6748 above us from being collected while we're compiling this function. */
6749 if (ggc_p && nested)
6750 ggc_push_context ();
6752 /* Run the optimizers and output the assembler code for this function. */
6753 rest_of_compilation (fndecl);
6755 /* Undo the GC context switch. */
6756 if (ggc_p && nested)
6759 current_function_returns_null |= can_reach_end;
6761 if (warn_missing_noreturn
6762 && !TREE_THIS_VOLATILE (fndecl)
6763 && !current_function_returns_null
6764 && !current_function_returns_value)
6765 warning ("function might be possible candidate for attribute `noreturn'");
6767 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6768 warning ("`noreturn' function does return");
6769 else if (warn_return_type && can_reach_end
6770 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6771 /* If this function returns non-void and control can drop through,
6773 warning ("control reaches end of non-void function");
6774 /* With just -W, complain only if function returns both with
6775 and without a value. */
6776 else if (extra_warnings
6777 && current_function_returns_value && current_function_returns_null)
6778 warning ("this function may return with or without a value");
6780 /* If requested, warn about function definitions where the function will
6781 return a value (usually of some struct or union type) which itself will
6782 take up a lot of stack space. */
6784 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6786 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6790 register tree ret_type_size = TYPE_SIZE (ret_type);
6792 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6795 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6797 if (units > larger_than_size)
6798 warning_with_decl (fndecl,
6799 "size of return value of `%s' is %u bytes",
6805 /* Free all the tree nodes making up this function. */
6806 /* Switch back to allocating nodes permanently
6807 until we start another function. */
6809 permanent_allocation (1);
6811 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6813 /* Stop pointing to the local nodes about to be freed. */
6814 /* But DECL_INITIAL must remain nonzero so we know this
6815 was an actual function definition. */
6816 /* For a nested function, this is done in pop_c_function_context. */
6817 /* If rest_of_compilation set this to 0, leave it 0. */
6818 if (DECL_INITIAL (fndecl) != 0)
6819 DECL_INITIAL (fndecl) = error_mark_node;
6820 DECL_ARGUMENTS (fndecl) = 0;
6823 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6825 #ifndef ASM_OUTPUT_CONSTRUCTOR
6826 if (! flag_gnu_linker)
6827 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6830 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6833 if (DECL_STATIC_DESTRUCTOR (fndecl))
6835 #ifndef ASM_OUTPUT_DESTRUCTOR
6836 if (! flag_gnu_linker)
6837 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6840 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6845 /* Let the error reporting routines know that we're outside a
6846 function. For a nested function, this value is used in
6847 pop_c_function_context and then reset via pop_function_context. */
6848 current_function_decl = NULL;
6852 /* Save and restore the variables in this file and elsewhere
6853 that keep track of the progress of compilation of the current function.
6854 Used for nested functions. */
6856 struct language_function
6859 tree shadowed_labels;
6862 int warn_about_return_type;
6864 struct binding_level *binding_level;
6867 /* Save and reinitialize the variables
6868 used during compilation of a C function. */
6871 push_c_function_context (f)
6874 struct language_function *p;
6875 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6878 p->named_labels = named_labels;
6879 p->shadowed_labels = shadowed_labels;
6880 p->returns_value = current_function_returns_value;
6881 p->returns_null = current_function_returns_null;
6882 p->warn_about_return_type = warn_about_return_type;
6883 p->extern_inline = current_extern_inline;
6884 p->binding_level = current_binding_level;
6887 /* Restore the variables used during compilation of a C function. */
6890 pop_c_function_context (f)
6893 struct language_function *p = f->language;
6896 /* Bring back all the labels that were shadowed. */
6897 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6898 if (DECL_NAME (TREE_VALUE (link)) != 0)
6899 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6900 = TREE_VALUE (link);
6902 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6904 /* Stop pointing to the local nodes about to be freed. */
6905 /* But DECL_INITIAL must remain nonzero so we know this
6906 was an actual function definition. */
6907 DECL_INITIAL (current_function_decl) = error_mark_node;
6908 DECL_ARGUMENTS (current_function_decl) = 0;
6911 named_labels = p->named_labels;
6912 shadowed_labels = p->shadowed_labels;
6913 current_function_returns_value = p->returns_value;
6914 current_function_returns_null = p->returns_null;
6915 warn_about_return_type = p->warn_about_return_type;
6916 current_extern_inline = p->extern_inline;
6917 current_binding_level = p->binding_level;
6923 /* Mark the language specific parts of F for GC. */
6925 mark_c_function_context (f)
6928 struct language_function *p = f->language;
6933 ggc_mark_tree (p->shadowed_labels);
6934 ggc_mark_tree (p->named_labels);
6935 mark_binding_level (&p->binding_level);
6938 /* integrate_decl_tree calls this function, but since we don't use the
6939 DECL_LANG_SPECIFIC field, this is a no-op. */
6942 copy_lang_decl (node)
6943 tree node ATTRIBUTE_UNUSED;
6947 /* Mark ARG for GC. */
6949 lang_mark_false_label_stack (arg)
6950 struct label_node *arg;
6952 /* C doesn't use false_label_stack. It better be NULL. */
6957 /* Mark the language specific bits in T for GC. */
6962 if (TREE_CODE (t) == IDENTIFIER_NODE)
6964 struct lang_identifier *i = (struct lang_identifier *) t;
6965 ggc_mark_tree (i->global_value);
6966 ggc_mark_tree (i->local_value);
6967 ggc_mark_tree (i->label_value);
6968 ggc_mark_tree (i->implicit_decl);
6969 ggc_mark_tree (i->error_locus);
6970 ggc_mark_tree (i->limbo_value);
6972 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6973 ggc_mark (TYPE_LANG_SPECIFIC (t));