1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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. */
33 #include "tree-inline.h"
51 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
53 { NORMAL, /* Ordinary declaration */
54 FUNCDEF, /* Function definition */
55 PARM, /* Declaration of parm before function body */
56 FIELD, /* Declaration inside struct or union */
57 BITFIELD, /* Likewise but with specified width */
58 TYPENAME}; /* Typename (inside cast or sizeof) */
61 /* Nonzero if we have seen an invalid cross reference
62 to a struct, union, or enum, but not yet printed the message. */
64 tree pending_invalid_xref;
65 /* File and line to appear in the eventual error message. */
66 const char *pending_invalid_xref_file;
67 int pending_invalid_xref_line;
69 /* While defining an enum type, this is 1 plus the last enumerator
70 constant value. Note that will do not have to save this or `enum_overflow'
71 around nested function definition since such a definition could only
72 occur in an enum value expression and we don't use these variables in
75 static tree enum_next_value;
77 /* Nonzero means that there was overflow computing enum_next_value. */
79 static int enum_overflow;
81 /* Parsing a function declarator leaves a list of parameter names
82 or a chain or parameter decls here. */
84 static tree last_function_parms;
86 /* Parsing a function declarator leaves here a chain of structure
87 and enum types declared in the parmlist. */
89 static tree last_function_parm_tags;
91 /* After parsing the declarator that starts a function definition,
92 `start_function' puts here the list of parameter names or chain of decls.
93 `store_parm_decls' finds it here. */
95 static tree current_function_parms;
97 /* Similar, for last_function_parm_tags. */
98 static tree current_function_parm_tags;
100 /* Similar, for the file and line that the prototype came from if this is
101 an old-style definition. */
102 static const char *current_function_prototype_file;
103 static int current_function_prototype_line;
105 /* The current statement tree. */
107 static struct stmt_tree_s c_stmt_tree;
109 /* The current scope statement stack. */
111 static tree c_scope_stmt_stack;
113 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
114 that have names. Here so we can clear out their names' definitions
115 at the end of the function. */
117 static tree named_labels;
119 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
121 static tree shadowed_labels;
123 /* Nonzero when store_parm_decls is called indicates a varargs function.
124 Value not meaningful after store_parm_decls. */
126 static int c_function_varargs;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type;
148 /* Nonzero when starting a function declared `extern inline'. */
150 static int current_extern_inline;
152 /* For each binding contour we allocate a binding_level structure
153 * which records the names defined in that contour.
156 * 1) one for each function definition,
157 * where internal declarations of the parameters appear.
158 * 2) one for each compound statement,
159 * to record its declarations.
161 * The current meaning of a name can be found by searching the levels from
162 * the current one out to the global one.
165 /* Note that the information in the `names' component of the global contour
166 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
170 /* A chain of _DECL nodes for all variables, constants, functions,
171 and typedef types. These are in the reverse of the order supplied.
175 /* A list of structure, union and enum definitions,
176 * for looking up tag names.
177 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
178 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
179 * or ENUMERAL_TYPE node.
183 /* For each level, a list of shadowed outer-level local definitions
184 to be restored when this level is popped.
185 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
186 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
189 /* For each level (except not the global one),
190 a chain of BLOCK nodes for all the levels
191 that were entered and exited one level down. */
194 /* The BLOCK node for this level, if one has been preallocated.
195 If 0, the BLOCK is allocated (if needed) when the level is popped. */
198 /* The binding level which this one is contained in (inherits from). */
199 struct binding_level *level_chain;
201 /* Nonzero for the level that holds the parameters of a function. */
204 /* Nonzero if this level "doesn't exist" for tags. */
205 char tag_transparent;
207 /* Nonzero if sublevels of this level "don't exist" for tags.
208 This is set in the parm level of a function definition
209 while reading the function body, so that the outermost block
210 of the function body will be tag-transparent. */
211 char subblocks_tag_transparent;
213 /* Nonzero means make a BLOCK for this level regardless of all else. */
216 /* Nonzero means make a BLOCK if this level has any subblocks. */
217 char keep_if_subblocks;
219 /* Number of decls in `names' that have incomplete
220 structure or union types. */
223 /* A list of decls giving the (reversed) specified order of parms,
224 not including any forward-decls in the parmlist.
225 This is so we can put the parms in proper order for assign_parms. */
229 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
231 /* The binding level currently in effect. */
233 static struct binding_level *current_binding_level;
235 /* A chain of binding_level structures awaiting reuse. */
237 static struct binding_level *free_binding_level;
239 /* The outermost binding level, for names of file scope.
240 This is created when the compiler is started and exists
241 through the entire run. */
243 static struct binding_level *global_binding_level;
245 /* Binding level structures are initialized by copying this one. */
247 static struct binding_level clear_binding_level
248 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
251 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
253 static int keep_next_level_flag;
255 /* Nonzero means make a BLOCK for the next level pushed
256 if it has subblocks. */
258 static int keep_next_if_subblocks;
260 /* The chain of outer levels of label scopes.
261 This uses the same data structure used for binding levels,
262 but it works differently: each link in the chain records
263 saved values of named_labels and shadowed_labels for
264 a label binding level outside the current one. */
266 static struct binding_level *label_level_chain;
268 /* Functions called automatically at the beginning and end of execution. */
270 tree static_ctors, static_dtors;
272 /* Forward declarations. */
274 static struct binding_level * make_binding_level PARAMS ((void));
275 static void mark_binding_level PARAMS ((void *));
276 static void clear_limbo_values PARAMS ((tree));
277 static int duplicate_decls PARAMS ((tree, tree, int));
278 static int redeclaration_error_message PARAMS ((tree, tree));
279 static void storedecls PARAMS ((tree));
280 static void storetags PARAMS ((tree));
281 static tree lookup_tag PARAMS ((enum tree_code, tree,
282 struct binding_level *, int));
283 static tree lookup_tag_reverse PARAMS ((tree));
284 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
286 static tree grokparms PARAMS ((tree, int));
287 static void layout_array_type PARAMS ((tree));
288 static tree c_make_fname_decl PARAMS ((tree, int));
289 static void c_expand_body PARAMS ((tree, int, int));
290 static void warn_if_shadowing PARAMS ((tree, tree));
292 /* C-specific option variables. */
294 /* Nonzero means allow type mismatches in conditional expressions;
295 just make their values `void'. */
297 int flag_cond_mismatch;
299 /* Nonzero means don't recognize the keyword `asm'. */
303 /* Nonzero means enable C89 Amendment 1 features. */
307 /* Nonzero means use the ISO C99 dialect of C. */
311 /* Nonzero means that we have builtin functions, and main is an int */
315 /* Nonzero means add default format_arg attributes for functions not
318 int flag_noniso_default_format_attributes = 1;
320 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
322 int flag_signed_bitfields = 1;
323 int explicit_flag_signed_bitfields = 0;
325 /* Nonzero means warn about use of implicit int. */
327 int warn_implicit_int;
329 /* Nonzero means warn about usage of long long when `-pedantic'. */
331 int warn_long_long = 1;
333 /* Nonzero means message about use of implicit function declarations;
334 1 means warning; 2 means error. */
336 int mesg_implicit_function_declaration = -1;
338 /* Nonzero means give string constants the type `const char *'
339 to get extra warnings from them. These warnings will be too numerous
340 to be useful, except in thoroughly ANSIfied programs. */
342 int flag_const_strings;
344 /* Nonzero means warn about pointer casts that can drop a type qualifier
345 from the pointer target type. */
349 /* Nonzero means warn when casting a function call to a type that does
350 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
351 when there is no previous declaration of sqrt or malloc. */
353 int warn_bad_function_cast;
355 /* Warn about functions which might be candidates for format attributes. */
357 int warn_missing_format_attribute;
359 /* Warn about traditional constructs whose meanings changed in ANSI C. */
361 int warn_traditional;
363 /* Nonzero means warn about sizeof(function) or addition/subtraction
364 of function pointers. */
366 int warn_pointer_arith;
368 /* Nonzero means warn for non-prototype function decls
369 or non-prototyped defs without previous prototype. */
371 int warn_strict_prototypes;
373 /* Nonzero means warn for any global function def
374 without separate previous prototype decl. */
376 int warn_missing_prototypes;
378 /* Nonzero means warn for any global function def
379 without separate previous decl. */
381 int warn_missing_declarations;
383 /* Nonzero means warn about multiple (redundant) decls for the same single
384 variable or function. */
386 int warn_redundant_decls = 0;
388 /* Nonzero means warn about extern declarations of objects not at
389 file-scope level and about *all* declarations of functions (whether
390 extern or static) not at file-scope level. Note that we exclude
391 implicit function declarations. To get warnings about those, use
394 int warn_nested_externs = 0;
396 /* Warn about a subscript that has type char. */
398 int warn_char_subscripts = 0;
400 /* Warn if a type conversion is done that might have confusing results. */
404 /* Warn if adding () is suggested. */
406 int warn_parentheses;
408 /* Warn if initializer is not completely bracketed. */
410 int warn_missing_braces;
412 /* Warn if main is suspicious. */
416 /* Warn about #pragma directives that are not recognised. */
418 int warn_unknown_pragmas = 0; /* Tri state variable. */
420 /* Warn about comparison of signed and unsigned values.
421 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
423 int warn_sign_compare = -1;
425 /* Warn about testing equality of floating point numbers. */
427 int warn_float_equal = 0;
429 /* Nonzero means warn about use of multicharacter literals. */
431 int warn_multichar = 1;
433 /* Nonzero means `$' can be in an identifier. */
435 #ifndef DOLLARS_IN_IDENTIFIERS
436 #define DOLLARS_IN_IDENTIFIERS 1
438 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
440 /* States indicating how grokdeclarator() should handle declspecs marked
441 with __attribute__((deprecated)). An object declared as
442 __attribute__((deprecated)) suppresses warnings of uses of other
445 enum deprecated_states {
450 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
452 /* Decode the string P as a language-specific option for C.
453 Return the number of strings consumed. Should not complain
454 if it does not recognise the option. */
457 c_decode_option (argc, argv)
458 int argc ATTRIBUTE_UNUSED;
461 int strings_processed;
464 static const struct {
465 /* The name of the option. */
467 /* If non-NULL, a flag variable to set to 0 or 1. If NULL,
468 this means that cpp handles this option. */
471 /* This list is in alphabetical order. Keep it like that. */
472 { "bad-function-cast", &warn_bad_function_cast },
473 { "cast-qual", &warn_cast_qual },
474 { "char-subscripts", &warn_char_subscripts },
476 { "comments", NULL },
477 { "conversion", &warn_conversion },
478 { "div-by-zero", &warn_div_by_zero },
479 { "float-equal", &warn_float_equal },
480 { "format-extra-args", &warn_format_extra_args },
481 { "format-nonliteral", &warn_format_nonliteral },
482 { "format-security", &warn_format_security },
483 { "format-y2k", &warn_format_y2k },
484 { "implicit-function-declaration", &mesg_implicit_function_declaration },
485 { "implicit-int", &warn_implicit_int },
487 { "long-long", &warn_long_long },
488 { "main", &warn_main },
489 { "missing-braces", &warn_missing_braces },
490 { "missing-declarations", &warn_missing_declarations },
491 { "missing-format-attribute", &warn_missing_format_attribute },
492 { "missing-prototypes", &warn_missing_prototypes },
493 { "multichar", &warn_multichar },
494 { "nested-externs", &warn_nested_externs },
495 { "parentheses", &warn_parentheses },
496 { "pointer-arith", &warn_pointer_arith },
497 { "redundant-decls", &warn_redundant_decls },
498 { "return-type", &warn_return_type },
499 { "sequence-point", &warn_sequence_point },
500 { "sign-compare", &warn_sign_compare },
501 { "strict-prototypes", &warn_strict_prototypes },
502 { "traditional", &warn_traditional },
503 { "trigraphs", NULL },
505 { "write-strings", &flag_const_strings }
508 strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
510 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
515 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
519 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
523 else if (!strncmp (p, "-std=", 5))
525 /* Select the appropriate language standard. We currently
527 -std=iso9899:1990 same as -ansi
528 -std=iso9899:199409 ISO C as modified in amend. 1
529 -std=iso9899:1999 ISO C 99
530 -std=c89 same as -std=iso9899:1990
531 -std=c99 same as -std=iso9899:1999
532 -std=gnu89 default, iso9899:1990 + gnu extensions
533 -std=gnu99 iso9899:1999 + gnu extensions
535 const char *const argstart = &p[5];
537 if (!strcmp (argstart, "iso9899:1990")
538 || !strcmp (argstart, "c89"))
543 flag_writable_strings = 0;
545 flag_no_nonansi_builtin = 1;
546 flag_noniso_default_format_attributes = 0;
549 else if (!strcmp (argstart, "iso9899:199409"))
554 else if (!strcmp (argstart, "iso9899:199x")
555 || !strcmp (argstart, "iso9899:1999")
556 || !strcmp (argstart, "c9x")
557 || !strcmp (argstart, "c99"))
559 flag_writable_strings = 0;
561 flag_no_nonansi_builtin = 1;
562 flag_noniso_default_format_attributes = 0;
566 else if (!strcmp (argstart, "gnu89"))
568 flag_writable_strings = 0;
570 flag_no_nonansi_builtin = 0;
571 flag_noniso_default_format_attributes = 1;
575 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
577 flag_writable_strings = 0;
579 flag_no_nonansi_builtin = 0;
580 flag_noniso_default_format_attributes = 1;
584 else if (!strcmp (argstart, "c++98"))
585 ; /* Handled by cpplib. */
587 error ("unknown C standard `%s'", argstart);
589 else if (!strcmp (p, "-fdollars-in-identifiers"))
590 dollars_in_ident = 1;
591 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
592 dollars_in_ident = 0;
593 else if (!strcmp (p, "-fsigned-char"))
594 flag_signed_char = 1;
595 else if (!strcmp (p, "-funsigned-char"))
596 flag_signed_char = 0;
597 else if (!strcmp (p, "-fno-signed-char"))
598 flag_signed_char = 0;
599 else if (!strcmp (p, "-fno-unsigned-char"))
600 flag_signed_char = 1;
601 else if (!strcmp (p, "-fsigned-bitfields")
602 || !strcmp (p, "-fno-unsigned-bitfields"))
604 flag_signed_bitfields = 1;
605 explicit_flag_signed_bitfields = 1;
607 else if (!strcmp (p, "-funsigned-bitfields")
608 || !strcmp (p, "-fno-signed-bitfields"))
610 flag_signed_bitfields = 0;
611 explicit_flag_signed_bitfields = 1;
613 else if (!strcmp (p, "-fshort-enums"))
614 flag_short_enums = 1;
615 else if (!strcmp (p, "-fno-short-enums"))
616 flag_short_enums = 0;
617 else if (!strcmp (p, "-fshort-wchar"))
618 flag_short_wchar = 1;
619 else if (!strcmp (p, "-fno-short-wchar"))
620 flag_short_wchar = 0;
621 else if (!strcmp (p, "-fcond-mismatch"))
622 flag_cond_mismatch = 1;
623 else if (!strcmp (p, "-fno-cond-mismatch"))
624 flag_cond_mismatch = 0;
625 else if (!strcmp (p, "-fshort-double"))
626 flag_short_double = 1;
627 else if (!strcmp (p, "-fno-short-double"))
628 flag_short_double = 0;
629 else if (!strcmp (p, "-fasm"))
631 else if (!strcmp (p, "-fno-asm"))
633 else if (!strcmp (p, "-fbuiltin"))
635 else if (!strcmp (p, "-fno-builtin"))
637 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
638 disable_builtin_function (p + strlen ("-fno-builtin-"));
639 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
641 else if (!strcmp (p, "-ansi"))
643 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
644 mesg_implicit_function_declaration = 2;
645 else if (!strncmp (p, "-Wformat=", 9))
646 set_Wformat (atoi (p + 9));
647 else if (!strcmp (p, "-Wformat"))
649 else if (!strcmp (p, "-Wno-format"))
651 else if (!strcmp (p, "-Wimplicit"))
653 warn_implicit_int = 1;
654 if (mesg_implicit_function_declaration != 2)
655 mesg_implicit_function_declaration = 1;
657 else if (!strcmp (p, "-Wno-implicit"))
658 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
659 else if (!strcmp (p, "-Wno-main"))
661 else if (!strcmp (p, "-Wunknown-pragmas"))
662 /* Set to greater than 1, so that even unknown pragmas in system
663 headers will be warned about. */
664 warn_unknown_pragmas = 2;
665 else if (!strcmp (p, "-Wno-unknown-pragmas"))
666 warn_unknown_pragmas = 0;
667 else if (!strcmp (p, "-Wall"))
669 /* We save the value of warn_uninitialized, since if they put
670 -Wuninitialized on the command line, we need to generate a
671 warning about not using it without also specifying -O. */
672 if (warn_uninitialized != 1)
673 warn_uninitialized = 2;
674 warn_implicit_int = 1;
675 mesg_implicit_function_declaration = 1;
676 warn_return_type = 1;
680 warn_char_subscripts = 1;
681 warn_parentheses = 1;
682 warn_sequence_point = 1;
683 warn_missing_braces = 1;
684 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
685 it off only if it's not explicit. */
687 /* Only warn about unknown pragmas that are not in system headers. */
688 warn_unknown_pragmas = 1;
690 else if (!strcmp (p, "-E"))
691 flag_preprocess_only = 1;
695 for (i = 0; i < sizeof (warn_options) / sizeof (warn_options[0]); i++)
696 if (strncmp (p, "-W", 2) == 0
697 && warn_options[i].flag
698 && (strcmp (p+2, warn_options[i].option) == 0
699 || (strncmp (p+2, "no-", 3) == 0
700 && strcmp (p+5, warn_options[i].option) == 0)))
702 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
705 return strings_processed;
712 c_print_identifier (file, node, indent)
717 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
718 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
719 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
720 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
721 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
722 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
723 if (C_IS_RESERVED_WORD (node))
725 tree rid = ridpointers[C_RID_CODE (node)];
726 indent_to (file, indent + 4);
727 fprintf (file, "rid ");
728 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
729 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
733 /* Hook called at end of compilation to assume 1 elt
734 for a top-level tentative array defn that wasn't complete before. */
737 finish_incomplete_decl (decl)
740 if (TREE_CODE (decl) == VAR_DECL)
742 tree type = TREE_TYPE (decl);
743 if (type != error_mark_node
744 && TREE_CODE (type) == ARRAY_TYPE
745 && ! DECL_EXTERNAL (decl)
746 && TYPE_DOMAIN (type) == 0)
748 warning_with_decl (decl, "array `%s' assumed to have one element");
750 complete_array_type (type, NULL_TREE, 1);
752 layout_decl (decl, 0);
757 /* Create a new `struct binding_level'. */
759 static struct binding_level *
760 make_binding_level ()
763 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
766 /* Nonzero if we are currently in the global binding level. */
771 return current_binding_level == global_binding_level;
777 keep_next_level_flag = 1;
780 /* Nonzero if the current level needs to have a BLOCK made. */
785 return ((current_binding_level->keep_if_subblocks
786 && current_binding_level->blocks != 0)
787 || current_binding_level->keep
788 || current_binding_level->names != 0
789 || (current_binding_level->tags != 0
790 && !current_binding_level->tag_transparent));
793 /* Identify this binding level as a level of parameters.
794 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
795 But it turns out there is no way to pass the right value for
796 DEFINITION_FLAG, so we ignore it. */
799 declare_parm_level (definition_flag)
800 int definition_flag ATTRIBUTE_UNUSED;
802 current_binding_level->parm_flag = 1;
805 /* Nonzero if currently making parm declarations. */
810 return current_binding_level->parm_flag;
813 /* Enter a new binding level.
814 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
815 not for that of tags. */
818 pushlevel (tag_transparent)
821 struct binding_level *newlevel = NULL_BINDING_LEVEL;
823 /* If this is the top level of a function,
824 just make sure that NAMED_LABELS is 0. */
826 if (current_binding_level == global_binding_level)
831 /* Reuse or create a struct for this binding level. */
833 if (free_binding_level)
835 newlevel = free_binding_level;
836 free_binding_level = free_binding_level->level_chain;
840 newlevel = make_binding_level ();
843 /* Add this level to the front of the chain (stack) of levels that
846 *newlevel = clear_binding_level;
847 newlevel->tag_transparent
849 || (current_binding_level
850 ? current_binding_level->subblocks_tag_transparent
852 newlevel->level_chain = current_binding_level;
853 current_binding_level = newlevel;
854 newlevel->keep = keep_next_level_flag;
855 keep_next_level_flag = 0;
856 newlevel->keep_if_subblocks = keep_next_if_subblocks;
857 keep_next_if_subblocks = 0;
860 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
863 clear_limbo_values (block)
868 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
869 if (DECL_NAME (tem) != 0)
870 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
872 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
873 clear_limbo_values (tem);
876 /* Exit a binding level.
877 Pop the level off, and restore the state of the identifier-decl mappings
878 that were in effect when this level was entered.
880 If KEEP is nonzero, this level had explicit declarations, so
881 and create a "block" (a BLOCK node) for the level
882 to record its declarations and subblocks for symbol table output.
884 If FUNCTIONBODY is nonzero, this level is the body of a function,
885 so create a block as if KEEP were set and also clear out all
888 If REVERSE is nonzero, reverse the order of decls before putting
889 them into the BLOCK. */
892 poplevel (keep, reverse, functionbody)
898 /* The chain of decls was accumulated in reverse order.
899 Put it into forward order, just for cleanliness. */
901 tree tags = current_binding_level->tags;
902 tree subblocks = current_binding_level->blocks;
905 int block_previously_created;
907 keep |= current_binding_level->keep;
909 /* This warning is turned off because it causes warnings for
910 declarations like `extern struct foo *x'. */
912 /* Warn about incomplete structure types in this level. */
913 for (link = tags; link; link = TREE_CHAIN (link))
914 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
916 tree type = TREE_VALUE (link);
917 tree type_name = TYPE_NAME (type);
918 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
920 : DECL_NAME (type_name));
921 switch (TREE_CODE (type))
924 error ("`struct %s' incomplete in scope ending here", id);
927 error ("`union %s' incomplete in scope ending here", id);
930 error ("`enum %s' incomplete in scope ending here", id);
936 /* Get the decls in the order they were written.
937 Usually current_binding_level->names is in reverse order.
938 But parameter decls were previously put in forward order. */
941 current_binding_level->names
942 = decls = nreverse (current_binding_level->names);
944 decls = current_binding_level->names;
946 /* Output any nested inline functions within this block
947 if they weren't already output. */
949 for (decl = decls; decl; decl = TREE_CHAIN (decl))
950 if (TREE_CODE (decl) == FUNCTION_DECL
951 && ! TREE_ASM_WRITTEN (decl)
952 && DECL_INITIAL (decl) != 0
953 && TREE_ADDRESSABLE (decl))
955 /* If this decl was copied from a file-scope decl
956 on account of a block-scope extern decl,
957 propagate TREE_ADDRESSABLE to the file-scope decl.
959 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
960 true, since then the decl goes through save_for_inline_copying. */
961 if (DECL_ABSTRACT_ORIGIN (decl) != 0
962 && DECL_ABSTRACT_ORIGIN (decl) != decl)
963 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
966 /* We used to warn about unused variables in expand_end_bindings,
967 i.e. while generating RTL. But in function-at-a-time mode we may
968 choose to never expand a function at all (e.g. auto inlining), so
969 we do this explicitly now. */
970 warn_about_unused_variables (getdecls ());
972 /* If there were any declarations or structure tags in that level,
973 or if this level is a function body,
974 create a BLOCK to record them for the life of this function. */
977 block_previously_created = (current_binding_level->this_block != 0);
978 if (block_previously_created)
979 block = current_binding_level->this_block;
980 else if (keep || functionbody
981 || (current_binding_level->keep_if_subblocks && subblocks != 0))
982 block = make_node (BLOCK);
985 BLOCK_VARS (block) = decls;
986 BLOCK_SUBBLOCKS (block) = subblocks;
989 /* In each subblock, record that this is its superior. */
991 for (link = subblocks; link; link = TREE_CHAIN (link))
992 BLOCK_SUPERCONTEXT (link) = block;
994 /* Clear out the meanings of the local variables of this level. */
996 for (link = decls; link; link = TREE_CHAIN (link))
998 if (DECL_NAME (link) != 0)
1000 /* If the ident. was used or addressed via a local extern decl,
1001 don't forget that fact. */
1002 if (DECL_EXTERNAL (link))
1004 if (TREE_USED (link))
1005 TREE_USED (DECL_NAME (link)) = 1;
1006 if (TREE_ADDRESSABLE (link))
1007 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1009 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1013 /* Restore all name-meanings of the outer levels
1014 that were shadowed by this level. */
1016 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1017 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1019 /* If the level being exited is the top level of a function,
1020 check over all the labels, and clear out the current
1021 (function local) meanings of their names. */
1025 clear_limbo_values (block);
1027 /* If this is the top level block of a function,
1028 the vars are the function's parameters.
1029 Don't leave them in the BLOCK because they are
1030 found in the FUNCTION_DECL instead. */
1032 BLOCK_VARS (block) = 0;
1034 /* Clear out the definitions of all label names,
1035 since their scopes end here,
1036 and add them to BLOCK_VARS. */
1038 for (link = named_labels; link; link = TREE_CHAIN (link))
1040 tree label = TREE_VALUE (link);
1042 if (DECL_INITIAL (label) == 0)
1044 error_with_decl (label, "label `%s' used but not defined");
1045 /* Avoid crashing later. */
1046 define_label (input_filename, lineno,
1049 else if (warn_unused_label && !TREE_USED (label))
1050 warning_with_decl (label, "label `%s' defined but not used");
1051 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1053 /* Put the labels into the "variables" of the
1054 top-level block, so debugger can see them. */
1055 TREE_CHAIN (label) = BLOCK_VARS (block);
1056 BLOCK_VARS (block) = label;
1060 /* Pop the current level, and free the structure for reuse. */
1063 struct binding_level *level = current_binding_level;
1064 current_binding_level = current_binding_level->level_chain;
1066 level->level_chain = free_binding_level;
1067 free_binding_level = level;
1070 /* Dispose of the block that we just made inside some higher level. */
1072 DECL_INITIAL (current_function_decl) = block;
1075 if (!block_previously_created)
1076 current_binding_level->blocks
1077 = chainon (current_binding_level->blocks, block);
1079 /* If we did not make a block for the level just exited,
1080 any blocks made for inner levels
1081 (since they cannot be recorded as subblocks in that level)
1082 must be carried forward so they will later become subblocks
1083 of something else. */
1085 current_binding_level->blocks
1086 = chainon (current_binding_level->blocks, subblocks);
1088 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1089 binding contour so that they point to the appropriate construct, i.e.
1090 either to the current FUNCTION_DECL node, or else to the BLOCK node
1091 we just constructed.
1093 Note that for tagged types whose scope is just the formal parameter
1094 list for some function type specification, we can't properly set
1095 their TYPE_CONTEXTs here, because we don't have a pointer to the
1096 appropriate FUNCTION_TYPE node readily available to us. For those
1097 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1098 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1099 node which will represent the "scope" for these "parameter list local"
1103 for (link = tags; link; link = TREE_CHAIN (link))
1104 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1106 for (link = tags; link; link = TREE_CHAIN (link))
1107 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1110 TREE_USED (block) = 1;
1115 /* Insert BLOCK at the end of the list of subblocks of the
1116 current binding level. This is used when a BIND_EXPR is expanded,
1117 to handle the BLOCK node inside the BIND_EXPR. */
1120 insert_block (block)
1123 TREE_USED (block) = 1;
1124 current_binding_level->blocks
1125 = chainon (current_binding_level->blocks, block);
1128 /* Set the BLOCK node for the innermost scope
1129 (the one we are currently in). */
1135 current_binding_level->this_block = block;
1136 current_binding_level->names = chainon (current_binding_level->names,
1137 BLOCK_VARS (block));
1138 current_binding_level->blocks = chainon (current_binding_level->blocks,
1139 BLOCK_SUBBLOCKS (block));
1145 struct binding_level *newlevel;
1147 /* Reuse or create a struct for this binding level. */
1149 if (free_binding_level)
1151 newlevel = free_binding_level;
1152 free_binding_level = free_binding_level->level_chain;
1156 newlevel = make_binding_level ();
1159 /* Add this level to the front of the chain (stack) of label levels. */
1161 newlevel->level_chain = label_level_chain;
1162 label_level_chain = newlevel;
1164 newlevel->names = named_labels;
1165 newlevel->shadowed = shadowed_labels;
1167 shadowed_labels = 0;
1173 struct binding_level *level = label_level_chain;
1176 /* Clear out the definitions of the declared labels in this level.
1177 Leave in the list any ordinary, non-declared labels. */
1178 for (link = named_labels, prev = 0; link;)
1180 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1182 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1184 error_with_decl (TREE_VALUE (link),
1185 "label `%s' used but not defined");
1186 /* Avoid crashing later. */
1187 define_label (input_filename, lineno,
1188 DECL_NAME (TREE_VALUE (link)));
1190 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1191 warning_with_decl (TREE_VALUE (link),
1192 "label `%s' defined but not used");
1193 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1195 /* Delete this element from the list. */
1196 link = TREE_CHAIN (link);
1198 TREE_CHAIN (prev) = link;
1200 named_labels = link;
1205 link = TREE_CHAIN (link);
1209 /* Bring back all the labels that were shadowed. */
1210 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1211 if (DECL_NAME (TREE_VALUE (link)) != 0)
1212 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1213 = TREE_VALUE (link);
1215 named_labels = chainon (named_labels, level->names);
1216 shadowed_labels = level->shadowed;
1218 /* Pop the current level, and free the structure for reuse. */
1219 label_level_chain = label_level_chain->level_chain;
1220 level->level_chain = free_binding_level;
1221 free_binding_level = level;
1224 /* Push a definition or a declaration of struct, union or enum tag "name".
1225 "type" should be the type node.
1226 We assume that the tag "name" is not already defined.
1228 Note that the definition may really be just a forward reference.
1229 In that case, the TYPE_SIZE will be zero. */
1232 pushtag (name, type)
1235 struct binding_level *b;
1237 /* Find the proper binding level for this type tag. */
1239 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1244 /* Record the identifier as the type's name if it has none. */
1246 if (TYPE_NAME (type) == 0)
1247 TYPE_NAME (type) = name;
1250 b->tags = tree_cons (name, type, b->tags);
1252 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1253 tagged type we just added to the current binding level. This fake
1254 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1255 to output a representation of a tagged type, and it also gives
1256 us a convenient place to record the "scope start" address for the
1259 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1261 /* An approximation for now, so we can tell this is a function-scope tag.
1262 This will be updated in poplevel. */
1263 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1266 /* Handle when a new declaration NEWDECL
1267 has the same name as an old one OLDDECL
1268 in the same binding contour.
1269 Prints an error message if appropriate.
1271 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1272 Otherwise, return 0.
1274 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1275 and OLDDECL is in an outer binding level and should thus not be changed. */
1278 duplicate_decls (newdecl, olddecl, different_binding_level)
1279 tree newdecl, olddecl;
1280 int different_binding_level;
1282 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1283 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1284 && DECL_INITIAL (newdecl) != 0);
1285 tree oldtype = TREE_TYPE (olddecl);
1286 tree newtype = TREE_TYPE (newdecl);
1289 if (DECL_P (olddecl))
1291 if (TREE_CODE (newdecl) == FUNCTION_DECL
1292 && TREE_CODE (olddecl) == FUNCTION_DECL
1293 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1295 if (DECL_DECLARED_INLINE_P (newdecl)
1296 && DECL_UNINLINABLE (newdecl)
1297 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1298 /* Already warned elsewhere. */;
1299 else if (DECL_DECLARED_INLINE_P (olddecl)
1300 && DECL_UNINLINABLE (olddecl)
1301 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1302 /* Already warned. */;
1303 else if (DECL_DECLARED_INLINE_P (newdecl)
1304 && ! DECL_DECLARED_INLINE_P (olddecl)
1305 && DECL_UNINLINABLE (olddecl)
1306 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1308 warning_with_decl (newdecl,
1309 "function `%s' redeclared as inline");
1310 warning_with_decl (olddecl,
1311 "previous declaration of function `%s' with attribute noinline");
1313 else if (DECL_DECLARED_INLINE_P (olddecl)
1314 && DECL_UNINLINABLE (newdecl)
1315 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1317 warning_with_decl (newdecl,
1318 "function `%s' redeclared with attribute noinline");
1319 warning_with_decl (olddecl,
1320 "previous declaration of function `%s' was inline");
1324 DECL_ATTRIBUTES (newdecl)
1325 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1328 if (TREE_CODE (newtype) == ERROR_MARK
1329 || TREE_CODE (oldtype) == ERROR_MARK)
1332 /* New decl is completely inconsistent with the old one =>
1333 tell caller to replace the old one.
1334 This is always an error except in the case of shadowing a builtin. */
1335 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1337 if (TREE_CODE (olddecl) == FUNCTION_DECL
1338 && (DECL_BUILT_IN (olddecl)
1339 || DECL_BUILT_IN_NONANSI (olddecl)))
1341 /* If you declare a built-in or predefined function name as static,
1342 the old definition is overridden,
1343 but optionally warn this was a bad choice of name. */
1344 if (!TREE_PUBLIC (newdecl))
1348 else if (DECL_BUILT_IN (olddecl))
1349 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1351 warning_with_decl (newdecl, "shadowing library function `%s'");
1353 /* Likewise, if the built-in is not ansi, then programs can
1354 override it even globally without an error. */
1355 else if (! DECL_BUILT_IN (olddecl))
1356 warning_with_decl (newdecl,
1357 "library function `%s' declared as non-function");
1359 else if (DECL_BUILT_IN_NONANSI (olddecl))
1360 warning_with_decl (newdecl,
1361 "built-in function `%s' declared as non-function");
1363 warning_with_decl (newdecl,
1364 "built-in function `%s' declared as non-function");
1368 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1369 error_with_decl (olddecl, "previous declaration of `%s'");
1375 /* For real parm decl following a forward decl,
1376 return 1 so old decl will be reused. */
1377 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1378 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1381 /* The new declaration is the same kind of object as the old one.
1382 The declarations may partially match. Print warnings if they don't
1383 match enough. Ultimately, copy most of the information from the new
1384 decl to the old one, and keep using the old one. */
1386 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1388 /* A function declaration for a built-in function. */
1389 if (!TREE_PUBLIC (newdecl))
1391 /* If you declare a built-in function name as static, the
1392 built-in definition is overridden,
1393 but optionally warn this was a bad choice of name. */
1395 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1396 /* Discard the old built-in function. */
1399 else if (!types_match)
1401 /* Accept the return type of the new declaration if same modes. */
1402 tree oldreturntype = TREE_TYPE (oldtype);
1403 tree newreturntype = TREE_TYPE (newtype);
1405 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1407 /* Function types may be shared, so we can't just modify
1408 the return type of olddecl's function type. */
1410 = build_function_type (newreturntype,
1411 TYPE_ARG_TYPES (oldtype));
1412 trytype = build_type_attribute_variant (trytype,
1413 TYPE_ATTRIBUTES (oldtype));
1415 types_match = comptypes (newtype, trytype);
1419 /* Accept harmless mismatch in first argument type also.
1420 This is for the ffs and fprintf builtins. */
1421 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1422 && TYPE_ARG_TYPES (oldtype) != 0
1423 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1424 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1425 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1426 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1428 /* Function types may be shared, so we can't just modify
1429 the return type of olddecl's function type. */
1431 = build_function_type (TREE_TYPE (oldtype),
1432 tree_cons (NULL_TREE,
1433 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1434 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1435 trytype = build_type_attribute_variant (trytype,
1436 TYPE_ATTRIBUTES (oldtype));
1438 types_match = comptypes (newtype, trytype);
1442 if (! different_binding_level)
1443 TREE_TYPE (olddecl) = oldtype;
1445 else if (TYPE_ARG_TYPES (oldtype) == NULL
1446 && TYPE_ARG_TYPES (newtype) != NULL)
1448 /* For bcmp, bzero, fputs the builtin type has arguments not
1449 specified. Use the ones from the prototype so that type checking
1450 is done for them. */
1452 = build_function_type (TREE_TYPE (oldtype),
1453 TYPE_ARG_TYPES (newtype));
1454 trytype = build_type_attribute_variant (trytype,
1455 TYPE_ATTRIBUTES (oldtype));
1458 if (! different_binding_level)
1459 TREE_TYPE (olddecl) = oldtype;
1463 /* If types don't match for a built-in, throw away the built-in. */
1464 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1468 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1469 && DECL_SOURCE_LINE (olddecl) == 0)
1471 /* A function declaration for a predeclared function
1472 that isn't actually built in. */
1473 if (!TREE_PUBLIC (newdecl))
1475 /* If you declare it as static, the
1476 default definition is overridden. */
1479 else if (!types_match)
1481 /* If the types don't match, preserve volatility indication.
1482 Later on, we will discard everything else about the
1483 default declaration. */
1484 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1487 /* Permit char *foo () to match void *foo (...) if not pedantic,
1488 if one of them came from a system header file. */
1489 else if (!types_match
1490 && TREE_CODE (olddecl) == FUNCTION_DECL
1491 && TREE_CODE (newdecl) == FUNCTION_DECL
1492 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1493 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1494 && (DECL_IN_SYSTEM_HEADER (olddecl)
1495 || DECL_IN_SYSTEM_HEADER (newdecl))
1496 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1497 && TYPE_ARG_TYPES (oldtype) == 0
1498 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1499 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1501 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1502 && TYPE_ARG_TYPES (newtype) == 0
1503 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1504 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1507 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1508 /* Make sure we keep void * as ret type, not char *. */
1509 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1510 TREE_TYPE (newdecl) = newtype = oldtype;
1512 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1513 we will come back here again. */
1514 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1516 else if (!types_match
1517 /* Permit char *foo (int, ...); followed by char *foo ();
1519 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1521 /* Return types must still match. */
1522 && comptypes (TREE_TYPE (oldtype),
1523 TREE_TYPE (newtype))
1524 && TYPE_ARG_TYPES (newtype) == 0))
1526 error_with_decl (newdecl, "conflicting types for `%s'");
1527 /* Check for function type mismatch
1528 involving an empty arglist vs a nonempty one. */
1529 if (TREE_CODE (olddecl) == FUNCTION_DECL
1530 && comptypes (TREE_TYPE (oldtype),
1531 TREE_TYPE (newtype))
1532 && ((TYPE_ARG_TYPES (oldtype) == 0
1533 && DECL_INITIAL (olddecl) == 0)
1535 (TYPE_ARG_TYPES (newtype) == 0
1536 && DECL_INITIAL (newdecl) == 0)))
1538 /* Classify the problem further. */
1539 tree t = TYPE_ARG_TYPES (oldtype);
1541 t = TYPE_ARG_TYPES (newtype);
1542 for (; t; t = TREE_CHAIN (t))
1544 tree type = TREE_VALUE (t);
1546 if (TREE_CHAIN (t) == 0
1547 && TYPE_MAIN_VARIANT (type) != void_type_node)
1549 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1553 if (simple_type_promotes_to (type) != NULL_TREE)
1555 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1560 error_with_decl (olddecl, "previous declaration of `%s'");
1564 errmsg = redeclaration_error_message (newdecl, olddecl);
1570 error_with_decl (newdecl, "redefinition of `%s'");
1573 error_with_decl (newdecl, "redeclaration of `%s'");
1576 error_with_decl (newdecl, "conflicting declarations of `%s'");
1582 error_with_decl (olddecl,
1583 ((DECL_INITIAL (olddecl)
1584 && current_binding_level == global_binding_level)
1585 ? "`%s' previously defined here"
1586 : "`%s' previously declared here"));
1589 else if (TREE_CODE (newdecl) == TYPE_DECL
1590 && (DECL_IN_SYSTEM_HEADER (olddecl)
1591 || DECL_IN_SYSTEM_HEADER (newdecl)))
1593 warning_with_decl (newdecl, "redefinition of `%s'");
1596 ((DECL_INITIAL (olddecl)
1597 && current_binding_level == global_binding_level)
1598 ? "`%s' previously defined here"
1599 : "`%s' previously declared here"));
1601 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1602 && DECL_INITIAL (olddecl) != 0
1603 && TYPE_ARG_TYPES (oldtype) == 0
1604 && TYPE_ARG_TYPES (newtype) != 0
1605 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1609 /* Prototype decl follows defn w/o prototype. */
1611 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1612 type = TYPE_ARG_TYPES (newtype),
1615 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1617 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1618 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1620 warning_with_decl (newdecl, "prototype for `%s' follows");
1621 warning_with_decl (olddecl, "non-prototype definition here");
1624 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1625 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1627 error_with_decl (newdecl,
1628 "prototype for `%s' follows and number of arguments doesn't match");
1629 error_with_decl (olddecl, "non-prototype definition here");
1633 /* Type for passing arg must be consistent
1634 with that declared for the arg. */
1635 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1637 error_with_decl (newdecl,
1638 "prototype for `%s' follows and argument %d doesn't match",
1640 error_with_decl (olddecl, "non-prototype definition here");
1646 /* Warn about mismatches in various flags. */
1649 /* Warn if function is now inline
1650 but was previously declared not inline and has been called. */
1651 if (TREE_CODE (olddecl) == FUNCTION_DECL
1652 && ! DECL_DECLARED_INLINE_P (olddecl)
1653 && DECL_DECLARED_INLINE_P (newdecl)
1654 && TREE_USED (olddecl))
1655 warning_with_decl (newdecl,
1656 "`%s' declared inline after being called");
1657 if (TREE_CODE (olddecl) == FUNCTION_DECL
1658 && ! DECL_DECLARED_INLINE_P (olddecl)
1659 && DECL_DECLARED_INLINE_P (newdecl)
1660 && DECL_INITIAL (olddecl) != 0)
1661 warning_with_decl (newdecl,
1662 "`%s' declared inline after its definition");
1664 /* If pedantic, warn when static declaration follows a non-static
1665 declaration. Otherwise, do so only for functions. */
1666 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1667 && TREE_PUBLIC (olddecl)
1668 && !TREE_PUBLIC (newdecl))
1669 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1671 /* If warn_traditional, warn when a non-static function
1672 declaration follows a static one. */
1673 if (warn_traditional && !in_system_header
1674 && TREE_CODE (olddecl) == FUNCTION_DECL
1675 && !TREE_PUBLIC (olddecl)
1676 && TREE_PUBLIC (newdecl))
1677 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1679 /* Warn when const declaration follows a non-const
1680 declaration, but not for functions. */
1681 if (TREE_CODE (olddecl) != FUNCTION_DECL
1682 && !TREE_READONLY (olddecl)
1683 && TREE_READONLY (newdecl))
1684 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1685 /* These bits are logically part of the type, for variables.
1686 But not for functions
1687 (where qualifiers are not valid ANSI anyway). */
1688 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1689 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1690 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1691 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1695 /* Optionally warn about more than one declaration for the same name. */
1696 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1697 /* Don't warn about a function declaration
1698 followed by a definition. */
1699 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1700 && DECL_INITIAL (olddecl) == 0)
1701 /* Don't warn about extern decl followed by (tentative) definition. */
1702 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1704 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1705 warning_with_decl (olddecl, "previous declaration of `%s'");
1708 /* Copy all the DECL_... slots specified in the new decl
1709 except for any that we copy here from the old type.
1711 Past this point, we don't change OLDTYPE and NEWTYPE
1712 even if we change the types of NEWDECL and OLDDECL. */
1716 /* When copying info to olddecl, we store into write_olddecl
1717 instead. This allows us to avoid modifying olddecl when
1718 different_binding_level is true. */
1719 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1721 /* Merge the data types specified in the two decls. */
1722 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1724 if (different_binding_level)
1726 if (TYPE_ARG_TYPES (oldtype) != 0
1727 && TYPE_ARG_TYPES (newtype) == 0)
1728 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1731 = build_type_attribute_variant
1733 merge_attributes (TYPE_ATTRIBUTES (newtype),
1734 TYPE_ATTRIBUTES (oldtype)));
1738 = TREE_TYPE (olddecl)
1739 = common_type (newtype, oldtype);
1742 /* Lay the type out, unless already done. */
1743 if (oldtype != TREE_TYPE (newdecl))
1745 if (TREE_TYPE (newdecl) != error_mark_node)
1746 layout_type (TREE_TYPE (newdecl));
1747 if (TREE_CODE (newdecl) != FUNCTION_DECL
1748 && TREE_CODE (newdecl) != TYPE_DECL
1749 && TREE_CODE (newdecl) != CONST_DECL)
1750 layout_decl (newdecl, 0);
1754 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1755 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1756 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1757 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1758 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1759 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1761 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1762 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1766 /* Keep the old rtl since we can safely use it. */
1767 COPY_DECL_RTL (olddecl, newdecl);
1769 /* Merge the type qualifiers. */
1770 if (TREE_CODE (olddecl) == FUNCTION_DECL
1771 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1772 && ! TREE_THIS_VOLATILE (newdecl))
1773 TREE_THIS_VOLATILE (write_olddecl) = 0;
1775 if (TREE_READONLY (newdecl))
1776 TREE_READONLY (write_olddecl) = 1;
1778 if (TREE_THIS_VOLATILE (newdecl))
1780 TREE_THIS_VOLATILE (write_olddecl) = 1;
1781 if (TREE_CODE (newdecl) == VAR_DECL
1782 /* If an automatic variable is re-declared in the same
1783 function scope, but the old declaration was not
1784 volatile, make_var_volatile() would crash because the
1785 variable would have been assigned to a pseudo, not a
1786 MEM. Since this duplicate declaration is invalid
1787 anyway, we just skip the call. */
1789 make_var_volatile (newdecl);
1792 /* Keep source location of definition rather than declaration. */
1793 /* When called with different_binding_level set, keep the old
1794 information so that meaningful diagnostics can be given. */
1795 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1796 && ! different_binding_level)
1798 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1799 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1802 /* Merge the unused-warning information. */
1803 if (DECL_IN_SYSTEM_HEADER (olddecl))
1804 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1805 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1806 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1808 /* Merge the initialization information. */
1809 /* When called with different_binding_level set, don't copy over
1810 DECL_INITIAL, so that we don't accidentally change function
1811 declarations into function definitions. */
1812 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1813 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1815 /* Merge the section attribute.
1816 We want to issue an error if the sections conflict but that must be
1817 done later in decl_attributes since we are called before attributes
1819 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1820 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1822 /* Copy the assembler name.
1823 Currently, it can only be defined in the prototype. */
1824 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1826 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1828 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1829 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1830 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1831 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1832 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1835 /* If cannot merge, then use the new type and qualifiers,
1836 and don't preserve the old rtl. */
1837 else if (! different_binding_level)
1839 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1840 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1841 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1842 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1845 /* Merge the storage class information. */
1846 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1847 /* For functions, static overrides non-static. */
1848 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1850 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1851 /* This is since we don't automatically
1852 copy the attributes of NEWDECL into OLDDECL. */
1853 /* No need to worry about different_binding_level here because
1854 then TREE_PUBLIC (newdecl) was true. */
1855 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1856 /* If this clears `static', clear it in the identifier too. */
1857 if (! TREE_PUBLIC (olddecl))
1858 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1860 if (DECL_EXTERNAL (newdecl))
1862 if (! different_binding_level)
1864 /* Don't mess with these flags on local externs; they remain
1865 external even if there's a declaration at file scope which
1867 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1868 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1870 /* An extern decl does not override previous storage class. */
1871 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1872 if (! DECL_EXTERNAL (newdecl))
1873 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1877 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1878 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1881 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1883 /* If we're redefining a function previously defined as extern
1884 inline, make sure we emit debug info for the inline before we
1885 throw it away, in case it was inlined into a function that hasn't
1886 been written out yet. */
1887 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1889 (*debug_hooks->outlining_inline_function) (olddecl);
1891 /* The new defn must not be inline. */
1892 DECL_INLINE (newdecl) = 0;
1893 DECL_UNINLINABLE (newdecl) = 1;
1897 /* If either decl says `inline', this fn is inline,
1898 unless its definition was passed already. */
1899 if (DECL_DECLARED_INLINE_P (newdecl)
1900 || DECL_DECLARED_INLINE_P (olddecl))
1901 DECL_DECLARED_INLINE_P (newdecl) = 1;
1903 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1904 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1907 if (DECL_BUILT_IN (olddecl))
1909 /* Get rid of any built-in function if new arg types don't match it
1910 or if we have a function definition. */
1911 if (! types_match || new_is_definition)
1913 if (! different_binding_level)
1915 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1916 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1921 /* If redeclaring a builtin function, and not a definition,
1922 it stays built in. */
1923 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1924 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1928 /* Also preserve various other info from the definition. */
1929 if (! new_is_definition)
1931 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1932 /* When called with different_binding_level set, don't copy over
1933 DECL_INITIAL, so that we don't accidentally change function
1934 declarations into function definitions. */
1935 if (! different_binding_level)
1936 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1937 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1938 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1939 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1940 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1942 /* Set DECL_INLINE on the declaration if we've got a body
1943 from which to instantiate. */
1944 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1946 DECL_INLINE (newdecl) = 1;
1947 DECL_ABSTRACT_ORIGIN (newdecl)
1948 = (different_binding_level
1949 ? DECL_ORIGIN (olddecl)
1950 : DECL_ABSTRACT_ORIGIN (olddecl));
1955 /* If a previous declaration said inline, mark the
1956 definition as inlinable. */
1957 if (DECL_DECLARED_INLINE_P (newdecl)
1958 && ! DECL_UNINLINABLE (newdecl))
1959 DECL_INLINE (newdecl) = 1;
1962 if (different_binding_level)
1965 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1966 But preserve OLDDECL's DECL_UID. */
1968 unsigned olddecl_uid = DECL_UID (olddecl);
1970 memcpy ((char *) olddecl + sizeof (struct tree_common),
1971 (char *) newdecl + sizeof (struct tree_common),
1972 sizeof (struct tree_decl) - sizeof (struct tree_common));
1973 DECL_UID (olddecl) = olddecl_uid;
1976 /* NEWDECL contains the merged attribute lists.
1977 Update OLDDECL to be the same. */
1978 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1983 /* Check whether decl-node X shadows an existing declaration.
1984 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1985 which might be a NULL_TREE. */
1987 warn_if_shadowing (x, oldlocal)
1992 if (DECL_EXTERNAL (x))
1995 name = DECL_NAME (x);
1997 /* Warn if shadowing an argument at the top level of the body. */
1999 /* This warning doesn't apply to the parms of a nested fcn. */
2000 && ! current_binding_level->parm_flag
2001 /* Check that this is one level down from the parms. */
2002 && current_binding_level->level_chain->parm_flag
2003 /* Check that the decl being shadowed
2004 comes from the parm level, one level up. */
2005 && chain_member (oldlocal, current_binding_level->level_chain->names))
2007 if (TREE_CODE (oldlocal) == PARM_DECL)
2008 pedwarn ("declaration of `%s' shadows a parameter",
2009 IDENTIFIER_POINTER (name));
2011 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2012 IDENTIFIER_POINTER (name));
2014 /* Maybe warn if shadowing something else. */
2015 else if (warn_shadow
2016 /* No shadow warnings for internally generated vars. */
2017 && DECL_SOURCE_LINE (x) != 0
2018 /* No shadow warnings for vars made for inlining. */
2019 && ! DECL_FROM_INLINE (x))
2021 if (TREE_CODE (x) == PARM_DECL
2022 && current_binding_level->level_chain->parm_flag)
2023 /* Don't warn about the parm names in function declarator
2024 within a function declarator.
2025 It would be nice to avoid warning in any function
2026 declarator in a declaration, as opposed to a definition,
2027 but there is no way to tell it's not a definition. */
2031 if (TREE_CODE (oldlocal) == PARM_DECL)
2032 shadow_warning ("a parameter", name, oldlocal);
2034 shadow_warning ("a previous local", name, oldlocal);
2036 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2037 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2038 shadow_warning ("a global declaration", name,
2039 IDENTIFIER_GLOBAL_VALUE (name));
2043 /* Record a decl-node X as belonging to the current lexical scope.
2044 Check for errors (such as an incompatible declaration for the same
2045 name already seen in the same scope).
2047 Returns either X or an old decl for the same name.
2048 If an old decl is returned, it may have been smashed
2049 to agree with what X says. */
2056 tree name = DECL_NAME (x);
2057 struct binding_level *b = current_binding_level;
2059 /* Functions need the lang_decl data. */
2060 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2061 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2062 ggc_alloc_cleared (sizeof (struct lang_decl));
2064 DECL_CONTEXT (x) = current_function_decl;
2065 /* A local extern declaration for a function doesn't constitute nesting.
2066 A local auto declaration does, since it's a forward decl
2067 for a nested function coming later. */
2068 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2069 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2070 DECL_CONTEXT (x) = 0;
2074 int different_binding_level = 0;
2076 if (warn_nested_externs
2077 && DECL_EXTERNAL (x)
2078 && b != global_binding_level
2079 && x != IDENTIFIER_IMPLICIT_DECL (name)
2080 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2081 && !DECL_IN_SYSTEM_HEADER (x))
2082 warning ("nested extern declaration of `%s'",
2083 IDENTIFIER_POINTER (name));
2085 t = lookup_name_current_level (name);
2086 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2088 t = IDENTIFIER_GLOBAL_VALUE (name);
2089 /* Type decls at global scope don't conflict with externs declared
2090 inside lexical blocks. */
2091 if (! t || TREE_CODE (t) == TYPE_DECL)
2092 /* If there's no visible global declaration, try for an
2094 t = IDENTIFIER_LIMBO_VALUE (name);
2095 different_binding_level = 1;
2097 if (t != 0 && t == error_mark_node)
2098 /* error_mark_node is 0 for a while during initialization! */
2101 error_with_decl (x, "`%s' used prior to declaration");
2104 /* If this decl is `static' and an implicit decl was seen previously,
2106 if (TREE_PUBLIC (name)
2107 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2108 sets this for all functions. */
2109 && ! TREE_PUBLIC (x)
2110 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2111 /* We used to warn also for explicit extern followed by static,
2112 but sometimes you need to do it that way. */
2113 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2115 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2116 IDENTIFIER_POINTER (name));
2117 pedwarn_with_file_and_line
2118 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2119 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2120 "previous declaration of `%s'",
2121 IDENTIFIER_POINTER (name));
2122 TREE_THIS_VOLATILE (name) = 1;
2125 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2127 if (TREE_CODE (t) == PARM_DECL)
2129 /* Don't allow more than one "real" duplicate
2130 of a forward parm decl. */
2131 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2137 /* If we are processing a typedef statement, generate a whole new
2138 ..._TYPE node (which will be just an variant of the existing
2139 ..._TYPE node with identical properties) and then install the
2140 TYPE_DECL node generated to represent the typedef name as the
2141 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2143 The whole point here is to end up with a situation where each
2144 and every ..._TYPE node the compiler creates will be uniquely
2145 associated with AT MOST one node representing a typedef name.
2146 This way, even though the compiler substitutes corresponding
2147 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2148 early on, later parts of the compiler can always do the reverse
2149 translation and get back the corresponding typedef name. For
2152 typedef struct S MY_TYPE;
2155 Later parts of the compiler might only know that `object' was of
2156 type `struct S' if it were not for code just below. With this
2157 code however, later parts of the compiler see something like:
2159 struct S' == struct S
2160 typedef struct S' MY_TYPE;
2163 And they can then deduce (from the node for type struct S') that
2164 the original object declaration was:
2168 Being able to do this is important for proper support of protoize,
2169 and also for generating precise symbolic debugging information
2170 which takes full account of the programmer's (typedef) vocabulary.
2172 Obviously, we don't want to generate a duplicate ..._TYPE node if
2173 the TYPE_DECL node that we are now processing really represents a
2174 standard built-in type.
2176 Since all standard types are effectively declared at line zero
2177 in the source file, we can easily check to see if we are working
2178 on a standard type by checking the current value of lineno. */
2180 if (TREE_CODE (x) == TYPE_DECL)
2182 if (DECL_SOURCE_LINE (x) == 0)
2184 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2185 TYPE_NAME (TREE_TYPE (x)) = x;
2187 else if (TREE_TYPE (x) != error_mark_node
2188 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2190 tree tt = TREE_TYPE (x);
2191 DECL_ORIGINAL_TYPE (x) = tt;
2192 tt = build_type_copy (tt);
2194 TREE_USED (tt) = TREE_USED (x);
2199 /* Multiple external decls of the same identifier ought to match.
2200 We get warnings about inline functions where they are defined.
2201 Avoid duplicate warnings where they are used. */
2203 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2207 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2208 /* Decls in limbo are always extern, so no need to check that. */
2209 decl = IDENTIFIER_LIMBO_VALUE (name);
2213 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2214 /* If old decl is built-in, we already warned if we should. */
2215 && !DECL_BUILT_IN (decl))
2217 pedwarn_with_decl (x,
2218 "type mismatch with previous external decl");
2219 pedwarn_with_decl (decl, "previous external decl of `%s'");
2223 /* If a function has had an implicit declaration, and then is defined,
2224 make sure they are compatible. */
2226 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2227 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2228 && TREE_CODE (x) == FUNCTION_DECL
2229 && ! comptypes (TREE_TYPE (x),
2230 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2232 warning_with_decl (x, "type mismatch with previous implicit declaration");
2233 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2234 "previous implicit declaration of `%s'");
2237 /* This name is new in its binding level.
2238 Install the new declaration and return it. */
2239 if (b == global_binding_level)
2241 /* Install a global value. */
2243 /* If the first global decl has external linkage,
2244 warn if we later see static one. */
2245 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2246 TREE_PUBLIC (name) = 1;
2248 IDENTIFIER_GLOBAL_VALUE (name) = x;
2250 /* We no longer care about any previous block level declarations. */
2251 IDENTIFIER_LIMBO_VALUE (name) = 0;
2253 /* Don't forget if the function was used via an implicit decl. */
2254 if (IDENTIFIER_IMPLICIT_DECL (name)
2255 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2256 TREE_USED (x) = 1, TREE_USED (name) = 1;
2258 /* Don't forget if its address was taken in that way. */
2259 if (IDENTIFIER_IMPLICIT_DECL (name)
2260 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2261 TREE_ADDRESSABLE (x) = 1;
2263 /* Warn about mismatches against previous implicit decl. */
2264 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2265 /* If this real decl matches the implicit, don't complain. */
2266 && ! (TREE_CODE (x) == FUNCTION_DECL
2267 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2268 == integer_type_node)))
2269 pedwarn ("`%s' was previously implicitly declared to return `int'",
2270 IDENTIFIER_POINTER (name));
2272 /* If this decl is `static' and an `extern' was seen previously,
2273 that is erroneous. */
2274 if (TREE_PUBLIC (name)
2275 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2277 /* Okay to redeclare an ANSI built-in as static. */
2278 if (t != 0 && DECL_BUILT_IN (t))
2280 /* Okay to declare a non-ANSI built-in as anything. */
2281 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2283 /* Okay to have global type decl after an earlier extern
2284 declaration inside a lexical block. */
2285 else if (TREE_CODE (x) == TYPE_DECL)
2287 else if (IDENTIFIER_IMPLICIT_DECL (name))
2289 if (! TREE_THIS_VOLATILE (name))
2290 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2291 IDENTIFIER_POINTER (name));
2294 pedwarn ("`%s' was declared `extern' and later `static'",
2295 IDENTIFIER_POINTER (name));
2300 /* Here to install a non-global value. */
2301 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2302 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2304 IDENTIFIER_LOCAL_VALUE (name) = x;
2306 /* If this is an extern function declaration, see if we
2307 have a global definition or declaration for the function. */
2310 && TREE_CODE (x) == FUNCTION_DECL
2311 && TREE_CODE (oldglobal) == FUNCTION_DECL
2312 && DECL_EXTERNAL (x)
2313 && ! DECL_DECLARED_INLINE_P (x))
2315 /* We have one. Their types must agree. */
2316 if (! comptypes (TREE_TYPE (x),
2317 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2318 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2321 /* Inner extern decl is inline if global one is.
2322 Copy enough to really inline it. */
2323 if (DECL_DECLARED_INLINE_P (oldglobal))
2325 DECL_DECLARED_INLINE_P (x)
2326 = DECL_DECLARED_INLINE_P (oldglobal);
2327 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2328 DECL_INITIAL (x) = (current_function_decl == oldglobal
2329 ? 0 : DECL_INITIAL (oldglobal));
2330 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2331 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2332 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2333 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2334 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2335 DECL_ABSTRACT_ORIGIN (x)
2336 = DECL_ABSTRACT_ORIGIN (oldglobal);
2338 /* Inner extern decl is built-in if global one is. */
2339 if (DECL_BUILT_IN (oldglobal))
2341 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2342 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2344 /* Keep the arg types from a file-scope fcn defn. */
2345 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2346 && DECL_INITIAL (oldglobal)
2347 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2348 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2353 /* This case is probably sometimes the right thing to do. */
2354 /* If we have a local external declaration,
2355 then any file-scope declaration should not
2356 have been static. */
2357 if (oldlocal == 0 && oldglobal != 0
2358 && !TREE_PUBLIC (oldglobal)
2359 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2360 warning ("`%s' locally external but globally static",
2361 IDENTIFIER_POINTER (name));
2364 /* If we have a local external declaration,
2365 and no file-scope declaration has yet been seen,
2366 then if we later have a file-scope decl it must not be static. */
2368 && DECL_EXTERNAL (x)
2372 TREE_PUBLIC (name) = 1;
2374 /* Save this decl, so that we can do type checking against
2375 other decls after it falls out of scope.
2377 Only save it once. This prevents temporary decls created in
2378 expand_inline_function from being used here, since this
2379 will have been set when the inline function was parsed.
2380 It also helps give slightly better warnings. */
2381 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2382 IDENTIFIER_LIMBO_VALUE (name) = x;
2385 warn_if_shadowing (x, oldlocal);
2387 /* If storing a local value, there may already be one (inherited).
2388 If so, record it for restoration when this binding level ends. */
2390 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2393 /* Keep count of variables in this level with incomplete type.
2394 If the input is erroneous, we can have error_mark in the type
2395 slot (e.g. "f(void a, ...)") - that doesn't count as an
2397 if (TREE_TYPE (x) != error_mark_node
2398 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2400 tree element = TREE_TYPE (x);
2402 while (TREE_CODE (element) == ARRAY_TYPE)
2403 element = TREE_TYPE (element);
2404 if (TREE_CODE (element) == RECORD_TYPE
2405 || TREE_CODE (element) == UNION_TYPE)
2410 /* Put decls on list in reverse order.
2411 We will reverse them later if necessary. */
2412 TREE_CHAIN (x) = b->names;
2418 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2421 pushdecl_top_level (x)
2425 struct binding_level *b = current_binding_level;
2427 current_binding_level = global_binding_level;
2429 current_binding_level = b;
2433 /* Generate an implicit declaration for identifier FUNCTIONID
2434 as a function of type int (). Print a warning if appropriate. */
2437 implicitly_declare (functionid)
2441 int traditional_warning = 0;
2442 /* Only one "implicit declaration" warning per identifier. */
2443 int implicit_warning;
2445 /* We used to reuse an old implicit decl here,
2446 but this loses with inline functions because it can clobber
2447 the saved decl chains. */
2449 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2450 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2453 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2455 /* Warn of implicit decl following explicit local extern decl.
2456 This is probably a program designed for traditional C. */
2457 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2458 traditional_warning = 1;
2460 /* Warn once of an implicit declaration. */
2461 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2463 DECL_EXTERNAL (decl) = 1;
2464 TREE_PUBLIC (decl) = 1;
2466 /* Record that we have an implicit decl and this is it. */
2467 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2469 /* ANSI standard says implicit declarations are in the innermost block.
2470 So we record the decl in the standard fashion. */
2473 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2474 maybe_objc_check_decl (decl);
2476 rest_of_decl_compilation (decl, NULL, 0, 0);
2478 if (implicit_warning)
2479 implicit_decl_warning (functionid);
2480 else if (warn_traditional && traditional_warning)
2481 warning ("function `%s' was previously declared within a block",
2482 IDENTIFIER_POINTER (functionid));
2484 /* Write a record describing this implicit function declaration to the
2485 prototypes file (if requested). */
2487 gen_aux_info_record (decl, 0, 1, 0);
2489 /* Possibly apply some default attributes to this implicit declaration. */
2490 decl_attributes (&decl, NULL_TREE, 0);
2496 implicit_decl_warning (id)
2499 const char *name = IDENTIFIER_POINTER (id);
2500 if (mesg_implicit_function_declaration == 2)
2501 error ("implicit declaration of function `%s'", name);
2502 else if (mesg_implicit_function_declaration == 1)
2503 warning ("implicit declaration of function `%s'", name);
2506 /* Return zero if the declaration NEWDECL is valid
2507 when the declaration OLDDECL (assumed to be for the same name)
2508 has already been seen.
2509 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2510 and 3 if it is a conflicting declaration. */
2513 redeclaration_error_message (newdecl, olddecl)
2514 tree newdecl, olddecl;
2516 if (TREE_CODE (newdecl) == TYPE_DECL)
2518 /* Do not complain about type redeclarations where at least one
2519 declaration was in a system header. */
2520 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2524 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2526 /* Declarations of functions can insist on internal linkage
2527 but they can't be inconsistent with internal linkage,
2528 so there can be no error on that account.
2529 However defining the same name twice is no good. */
2530 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2531 /* However, defining once as extern inline and a second
2532 time in another way is ok. */
2533 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2534 && ! (DECL_DECLARED_INLINE_P (newdecl)
2535 && DECL_EXTERNAL (newdecl))))
2539 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2541 /* Objects declared at top level: */
2542 /* If at least one is a reference, it's ok. */
2543 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2545 /* Reject two definitions. */
2546 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2548 /* Now we have two tentative defs, or one tentative and one real def. */
2549 /* Insist that the linkage match. */
2550 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2554 else if (current_binding_level->parm_flag
2555 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2559 /* Newdecl has block scope. If olddecl has block scope also, then
2560 reject two definitions, and reject a definition together with an
2561 external reference. Otherwise, it is OK, because newdecl must
2562 be an extern reference to olddecl. */
2563 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2564 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2570 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2571 Create one if none exists so far for the current function.
2572 This function is called for both label definitions and label references. */
2578 tree decl = IDENTIFIER_LABEL_VALUE (id);
2580 if (current_function_decl == 0)
2582 error ("label %s referenced outside of any function",
2583 IDENTIFIER_POINTER (id));
2587 /* Use a label already defined or ref'd with this name. */
2590 /* But not if it is inherited and wasn't declared to be inheritable. */
2591 if (DECL_CONTEXT (decl) != current_function_decl
2592 && ! C_DECLARED_LABEL_FLAG (decl))
2593 return shadow_label (id);
2597 decl = build_decl (LABEL_DECL, id, void_type_node);
2599 /* A label not explicitly declared must be local to where it's ref'd. */
2600 DECL_CONTEXT (decl) = current_function_decl;
2602 DECL_MODE (decl) = VOIDmode;
2604 /* Say where one reference is to the label,
2605 for the sake of the error if it is not defined. */
2606 DECL_SOURCE_LINE (decl) = lineno;
2607 DECL_SOURCE_FILE (decl) = input_filename;
2609 IDENTIFIER_LABEL_VALUE (id) = decl;
2611 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2616 /* Make a label named NAME in the current function,
2617 shadowing silently any that may be inherited from containing functions
2618 or containing scopes.
2620 Note that valid use, if the label being shadowed
2621 comes from another scope in the same function,
2622 requires calling declare_nonlocal_label right away. */
2628 tree decl = IDENTIFIER_LABEL_VALUE (name);
2634 /* Check to make sure that the label hasn't already been declared
2635 at this label scope */
2636 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2637 if (TREE_VALUE (dup) == decl)
2639 error ("duplicate label declaration `%s'",
2640 IDENTIFIER_POINTER (name));
2641 error_with_decl (TREE_VALUE (dup),
2642 "this is a previous declaration");
2643 /* Just use the previous declaration. */
2644 return lookup_label (name);
2647 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2648 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2651 return lookup_label (name);
2654 /* Define a label, specifying the location in the source file.
2655 Return the LABEL_DECL node for the label, if the definition is valid.
2656 Otherwise return 0. */
2659 define_label (filename, line, name)
2660 const char *filename;
2664 tree decl = lookup_label (name);
2666 /* If label with this name is known from an outer context, shadow it. */
2667 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2669 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2670 IDENTIFIER_LABEL_VALUE (name) = 0;
2671 decl = lookup_label (name);
2674 if (warn_traditional && !in_system_header && lookup_name (name))
2675 warning_with_file_and_line (filename, line,
2676 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2677 IDENTIFIER_POINTER (name));
2679 if (DECL_INITIAL (decl) != 0)
2681 error_with_file_and_line (filename, line, "duplicate label `%s'",
2682 IDENTIFIER_POINTER (name));
2687 /* Mark label as having been defined. */
2688 DECL_INITIAL (decl) = error_mark_node;
2689 /* Say where in the source. */
2690 DECL_SOURCE_FILE (decl) = filename;
2691 DECL_SOURCE_LINE (decl) = line;
2696 /* Return the list of declarations of the current level.
2697 Note that this list is in reverse order unless/until
2698 you nreverse it; and when you do nreverse it, you must
2699 store the result back using `storedecls' or you will lose. */
2704 return current_binding_level->names;
2707 /* Return the list of type-tags (for structs, etc) of the current level. */
2712 return current_binding_level->tags;
2715 /* Store the list of declarations of the current level.
2716 This is done for the parameter declarations of a function being defined,
2717 after they are modified in the light of any missing parameters. */
2723 current_binding_level->names = decls;
2726 /* Similarly, store the list of tags of the current level. */
2732 current_binding_level->tags = tags;
2735 /* Given NAME, an IDENTIFIER_NODE,
2736 return the structure (or union or enum) definition for that name.
2737 Searches binding levels from BINDING_LEVEL up to the global level.
2738 If THISLEVEL_ONLY is nonzero, searches only the specified context
2739 (but skips any tag-transparent contexts to find one that is
2740 meaningful for tags).
2741 CODE says which kind of type the caller wants;
2742 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2743 If the wrong kind of type is found, an error is reported. */
2746 lookup_tag (code, name, binding_level, thislevel_only)
2747 enum tree_code code;
2748 struct binding_level *binding_level;
2752 struct binding_level *level;
2755 for (level = binding_level; level; level = level->level_chain)
2758 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2760 if (TREE_PURPOSE (tail) == name)
2762 if (TREE_CODE (TREE_VALUE (tail)) != code)
2764 /* Definition isn't the kind we were looking for. */
2765 pending_invalid_xref = name;
2766 pending_invalid_xref_file = input_filename;
2767 pending_invalid_xref_line = lineno;
2768 /* If in the same binding level as a declaration as a tag
2769 of a different type, this must not be allowed to
2770 shadow that tag, so give the error immediately.
2771 (For example, "struct foo; union foo;" is invalid.) */
2773 pending_xref_error ();
2775 return TREE_VALUE (tail);
2778 if (! level->tag_transparent)
2788 /* Print an error message now
2789 for a recent invalid struct, union or enum cross reference.
2790 We don't print them immediately because they are not invalid
2791 when used in the `struct foo;' construct for shadowing. */
2794 pending_xref_error ()
2796 if (pending_invalid_xref != 0)
2797 error_with_file_and_line (pending_invalid_xref_file,
2798 pending_invalid_xref_line,
2799 "`%s' defined as wrong kind of tag",
2800 IDENTIFIER_POINTER (pending_invalid_xref));
2801 pending_invalid_xref = 0;
2804 /* Given a type, find the tag that was defined for it and return the tag name.
2805 Otherwise return 0. */
2808 lookup_tag_reverse (type)
2811 struct binding_level *level;
2813 for (level = current_binding_level; level; level = level->level_chain)
2816 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2818 if (TREE_VALUE (tail) == type)
2819 return TREE_PURPOSE (tail);
2825 /* Look up NAME in the current binding level and its superiors
2826 in the namespace of variables, functions and typedefs.
2827 Return a ..._DECL node of some kind representing its definition,
2828 or return 0 if it is undefined. */
2836 if (current_binding_level != global_binding_level
2837 && IDENTIFIER_LOCAL_VALUE (name))
2838 val = IDENTIFIER_LOCAL_VALUE (name);
2840 val = IDENTIFIER_GLOBAL_VALUE (name);
2844 /* Similar to `lookup_name' but look only at current binding level. */
2847 lookup_name_current_level (name)
2852 if (current_binding_level == global_binding_level)
2853 return IDENTIFIER_GLOBAL_VALUE (name);
2855 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2858 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2859 if (DECL_NAME (t) == name)
2865 /* Mark ARG for GC. */
2868 mark_binding_level (arg)
2871 struct binding_level *level = *(struct binding_level **) arg;
2873 for (; level != 0; level = level->level_chain)
2875 ggc_mark_tree (level->names);
2876 ggc_mark_tree (level->tags);
2877 ggc_mark_tree (level->shadowed);
2878 ggc_mark_tree (level->blocks);
2879 ggc_mark_tree (level->this_block);
2880 ggc_mark_tree (level->parm_order);
2884 /* Create the predefined scalar types of C,
2885 and some nodes representing standard constants (0, 1, (void *) 0).
2886 Initialize the global binding level.
2887 Make definitions for built-in primitive functions. */
2890 c_init_decl_processing ()
2893 tree ptr_ftype_void, ptr_ftype_ptr;
2895 /* Adds some ggc roots, and reserved words for c-parse.in. */
2898 current_function_decl = NULL;
2899 named_labels = NULL;
2900 current_binding_level = NULL_BINDING_LEVEL;
2901 free_binding_level = NULL_BINDING_LEVEL;
2903 /* Make the binding_level structure for global names. */
2905 global_binding_level = current_binding_level;
2907 build_common_tree_nodes (flag_signed_char);
2909 c_common_nodes_and_builtins ();
2911 boolean_type_node = integer_type_node;
2912 boolean_true_node = integer_one_node;
2913 boolean_false_node = integer_zero_node;
2915 /* With GCC, C99's _Bool is always of size 1. */
2916 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2917 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2918 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2919 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2920 TYPE_PRECISION (c_bool_type_node) = 1;
2921 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2923 c_bool_false_node = build_int_2 (0, 0);
2924 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2925 c_bool_true_node = build_int_2 (1, 0);
2926 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2928 endlink = void_list_node;
2929 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2931 = build_function_type (ptr_type_node,
2932 tree_cons (NULL_TREE, ptr_type_node, endlink));
2934 /* Types which are common to the fortran compiler and libf2c. When
2935 changing these, you also need to be concerned with f/com.h. */
2937 if (TYPE_PRECISION (float_type_node)
2938 == TYPE_PRECISION (long_integer_type_node))
2940 g77_integer_type_node = long_integer_type_node;
2941 g77_uinteger_type_node = long_unsigned_type_node;
2943 else if (TYPE_PRECISION (float_type_node)
2944 == TYPE_PRECISION (integer_type_node))
2946 g77_integer_type_node = integer_type_node;
2947 g77_uinteger_type_node = unsigned_type_node;
2950 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
2952 if (g77_integer_type_node != NULL_TREE)
2954 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
2955 g77_integer_type_node));
2956 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
2957 g77_uinteger_type_node));
2960 if (TYPE_PRECISION (float_type_node) * 2
2961 == TYPE_PRECISION (long_integer_type_node))
2963 g77_longint_type_node = long_integer_type_node;
2964 g77_ulongint_type_node = long_unsigned_type_node;
2966 else if (TYPE_PRECISION (float_type_node) * 2
2967 == TYPE_PRECISION (long_long_integer_type_node))
2969 g77_longint_type_node = long_long_integer_type_node;
2970 g77_ulongint_type_node = long_long_unsigned_type_node;
2973 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
2975 if (g77_longint_type_node != NULL_TREE)
2977 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
2978 g77_longint_type_node));
2979 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
2980 g77_ulongint_type_node));
2983 pedantic_lvalues = pedantic;
2985 make_fname_decl = c_make_fname_decl;
2986 start_fname_decls ();
2988 incomplete_decl_finalize_hook = finish_incomplete_decl;
2990 /* Record our roots. */
2992 ggc_add_tree_root (c_global_trees, CTI_MAX);
2993 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
2994 ggc_add_tree_root (&c_scope_stmt_stack, 1);
2995 ggc_add_tree_root (&named_labels, 1);
2996 ggc_add_tree_root (&shadowed_labels, 1);
2997 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
2998 mark_binding_level);
2999 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3000 mark_binding_level);
3001 ggc_add_tree_root (&static_ctors, 1);
3002 ggc_add_tree_root (&static_dtors, 1);
3005 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3006 decl, NAME is the initialization string and TYPE_DEP indicates whether
3007 NAME depended on the type of the function. As we don't yet implement
3008 delayed emission of static data, we mark the decl as emitted
3009 so it is not placed in the output. Anything using it must therefore pull
3010 out the STRING_CST initializer directly. This does mean that these names
3011 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3014 c_make_fname_decl (id, type_dep)
3018 const char *name = fname_as_string (type_dep);
3019 tree decl, type, init;
3020 size_t length = strlen (name);
3022 type = build_array_type
3023 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3024 build_index_type (size_int (length)));
3026 decl = build_decl (VAR_DECL, id, type);
3027 /* We don't push the decl, so have to set its context here. */
3028 DECL_CONTEXT (decl) = current_function_decl;
3030 TREE_STATIC (decl) = 1;
3031 TREE_READONLY (decl) = 1;
3032 DECL_ARTIFICIAL (decl) = 1;
3034 init = build_string (length + 1, name);
3035 TREE_TYPE (init) = type;
3036 DECL_INITIAL (decl) = init;
3038 TREE_USED (decl) = 1;
3040 finish_decl (decl, init, NULL_TREE);
3045 /* Return a definition for a builtin function named NAME and whose data type
3046 is TYPE. TYPE should be a function type with argument types.
3047 FUNCTION_CODE tells later passes how to compile calls to this function.
3048 See tree.h for its possible values.
3050 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3051 the name to be called if we can't opencode the function. */
3054 builtin_function (name, type, function_code, class, library_name)
3058 enum built_in_class class;
3059 const char *library_name;
3061 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3062 DECL_EXTERNAL (decl) = 1;
3063 TREE_PUBLIC (decl) = 1;
3065 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3066 make_decl_rtl (decl, NULL);
3068 DECL_BUILT_IN_CLASS (decl) = class;
3069 DECL_FUNCTION_CODE (decl) = function_code;
3071 /* The return builtins leave the current function. */
3072 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
3073 TREE_THIS_VOLATILE (decl) = 1;
3075 /* Warn if a function in the namespace for users
3076 is used without an occasion to consider it declared. */
3077 if (name[0] != '_' || name[1] != '_')
3078 C_DECL_ANTICIPATED (decl) = 1;
3080 /* Possibly apply some default attributes to this built-in function. */
3081 decl_attributes (&decl, NULL_TREE, 0);
3086 /* Apply default attributes to a function, if a system function with default
3090 insert_default_attributes (decl)
3093 if (!TREE_PUBLIC (decl))
3095 c_common_insert_default_attributes (decl);
3098 /* Called when a declaration is seen that contains no names to declare.
3099 If its type is a reference to a structure, union or enum inherited
3100 from a containing scope, shadow that tag name for the current scope
3101 with a forward reference.
3102 If its type defines a new named structure or union
3103 or defines an enum, it is valid but we need not do anything here.
3104 Otherwise, it is an error. */
3107 shadow_tag (declspecs)
3110 shadow_tag_warned (declspecs, 0);
3114 shadow_tag_warned (declspecs, warned)
3117 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3124 pending_invalid_xref = 0;
3126 /* Remove the attributes from declspecs, since they will confuse the
3128 split_specs_attrs (declspecs, &specs, &attrs);
3130 for (link = specs; link; link = TREE_CHAIN (link))
3132 tree value = TREE_VALUE (link);
3133 enum tree_code code = TREE_CODE (value);
3135 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3136 /* Used to test also that TYPE_SIZE (value) != 0.
3137 That caused warning for `struct foo;' at top level in the file. */
3139 tree name = lookup_tag_reverse (value);
3146 if (warned != 1 && code != ENUMERAL_TYPE)
3147 /* Empty unnamed enum OK */
3149 pedwarn ("unnamed struct/union that defines no instances");
3155 t = lookup_tag (code, name, current_binding_level, 1);
3159 t = make_node (code);
3166 if (!warned && ! in_system_header)
3168 warning ("useless keyword or type name in empty declaration");
3175 error ("two types specified in one empty declaration");
3180 pedwarn ("empty declaration");
3184 /* Construct an array declarator. EXPR is the expression inside [], or
3185 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3186 to the pointer to which a parameter array is converted). STATIC_P is
3187 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3188 is non-zero is the array is [*], a VLA of unspecified length which is
3189 nevertheless a complete type (not currently implemented by GCC),
3190 zero otherwise. The declarator is constructed as an ARRAY_REF
3191 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3192 left of the [] (filled by in set_array_declarator_type) and operand 1
3193 is the expression inside; whose TREE_TYPE is the type qualifiers and
3194 which has TREE_STATIC set if "static" is used. */
3197 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3204 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3205 TREE_TYPE (decl) = quals;
3206 TREE_STATIC (decl) = (static_p ? 1 : 0);
3207 if (pedantic && !flag_isoc99)
3209 if (static_p || quals != NULL_TREE)
3210 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3212 pedwarn ("ISO C89 does not support `[*]' array declarators");
3215 warning ("GCC does not yet properly implement `[*]' array declarators");
3219 /* Set the type of an array declarator. DECL is the declarator, as
3220 constructed by build_array_declarator; TYPE is what appears on the left
3221 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3222 abstract declarator, zero otherwise; this is used to reject static and
3223 type qualifiers in abstract declarators, where they are not in the
3227 set_array_declarator_type (decl, type, abstract_p)
3232 TREE_OPERAND (decl, 0) = type;
3233 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3234 error ("static or type qualifiers in abstract declarator");
3238 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3241 groktypename (typename)
3246 if (TREE_CODE (typename) != TREE_LIST)
3249 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3251 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3253 /* Apply attributes. */
3254 decl_attributes (&typename, attrs, 0);
3259 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3262 groktypename_in_parm_context (typename)
3265 if (TREE_CODE (typename) != TREE_LIST)
3267 return grokdeclarator (TREE_VALUE (typename),
3268 TREE_PURPOSE (typename),
3272 /* Decode a declarator in an ordinary declaration or data definition.
3273 This is called as soon as the type information and variable name
3274 have been parsed, before parsing the initializer if any.
3275 Here we create the ..._DECL node, fill in its type,
3276 and put it on the list of decls for the current context.
3277 The ..._DECL node is returned as the value.
3279 Exception: for arrays where the length is not specified,
3280 the type is left null, to be filled in by `finish_decl'.
3282 Function definitions do not come here; they go to start_function
3283 instead. However, external and forward declarations of functions
3284 do go through here. Structure field declarations are done by
3285 grokfield and not through here. */
3288 start_decl (declarator, declspecs, initialized, attributes)
3289 tree declarator, declspecs;
3296 /* An object declared as __attribute__((deprecated)) suppresses
3297 warnings of uses of other deprecated items. */
3298 if (lookup_attribute ("deprecated", attributes))
3299 deprecated_state = DEPRECATED_SUPPRESS;
3301 decl = grokdeclarator (declarator, declspecs,
3302 NORMAL, initialized);
3304 deprecated_state = DEPRECATED_NORMAL;
3306 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3307 && MAIN_NAME_P (DECL_NAME (decl)))
3308 warning_with_decl (decl, "`%s' is usually a function");
3311 /* Is it valid for this decl to have an initializer at all?
3312 If not, set INITIALIZED to zero, which will indirectly
3313 tell `finish_decl' to ignore the initializer once it is parsed. */
3314 switch (TREE_CODE (decl))
3317 /* typedef foo = bar means give foo the same type as bar.
3318 We haven't parsed bar yet, so `finish_decl' will fix that up.
3319 Any other case of an initialization in a TYPE_DECL is an error. */
3320 if (pedantic || list_length (declspecs) > 1)
3322 error ("typedef `%s' is initialized",
3323 IDENTIFIER_POINTER (DECL_NAME (decl)));
3329 error ("function `%s' is initialized like a variable",
3330 IDENTIFIER_POINTER (DECL_NAME (decl)));
3335 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3336 error ("parameter `%s' is initialized",
3337 IDENTIFIER_POINTER (DECL_NAME (decl)));
3342 /* Don't allow initializations for incomplete types
3343 except for arrays which might be completed by the initialization. */
3345 /* This can happen if the array size is an undefined macro. We already
3346 gave a warning, so we don't need another one. */
3347 if (TREE_TYPE (decl) == error_mark_node)
3349 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3351 /* A complete type is ok if size is fixed. */
3353 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3354 || C_DECL_VARIABLE_SIZE (decl))
3356 error ("variable-sized object may not be initialized");
3360 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3362 error ("variable `%s' has initializer but incomplete type",
3363 IDENTIFIER_POINTER (DECL_NAME (decl)));
3366 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3368 error ("elements of array `%s' have incomplete type",
3369 IDENTIFIER_POINTER (DECL_NAME (decl)));
3377 /* Seems redundant with grokdeclarator. */
3378 if (current_binding_level != global_binding_level
3379 && DECL_EXTERNAL (decl)
3380 && TREE_CODE (decl) != FUNCTION_DECL)
3381 warning ("declaration of `%s' has `extern' and is initialized",
3382 IDENTIFIER_POINTER (DECL_NAME (decl)));
3384 DECL_EXTERNAL (decl) = 0;
3385 if (current_binding_level == global_binding_level)
3386 TREE_STATIC (decl) = 1;
3388 /* Tell `pushdecl' this is an initialized decl
3389 even though we don't yet have the initializer expression.
3390 Also tell `finish_decl' it may store the real initializer. */
3391 DECL_INITIAL (decl) = error_mark_node;
3394 /* If this is a function declaration, write a record describing it to the
3395 prototypes file (if requested). */
3397 if (TREE_CODE (decl) == FUNCTION_DECL)
3398 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3400 /* ANSI specifies that a tentative definition which is not merged with
3401 a non-tentative definition behaves exactly like a definition with an
3402 initializer equal to zero. (Section 3.7.2)
3403 -fno-common gives strict ANSI behavior. Usually you don't want it.
3404 This matters only for variables with external linkage. */
3405 if (!initialized && (! flag_no_common || ! TREE_PUBLIC (decl)))
3406 DECL_COMMON (decl) = 1;
3408 /* Set attributes here so if duplicate decl, will have proper attributes. */
3409 decl_attributes (&decl, attributes, 0);
3411 /* If #pragma weak was used, mark the decl weak now. */
3412 if (current_binding_level == global_binding_level)
3413 maybe_apply_pragma_weak (decl);
3415 if (TREE_CODE (decl) == FUNCTION_DECL
3416 && DECL_DECLARED_INLINE_P (decl)
3417 && DECL_UNINLINABLE (decl)
3418 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3419 warning_with_decl (decl,
3420 "inline function `%s' given attribute noinline");
3422 /* Add this decl to the current binding level.
3423 TEM may equal DECL or it may be a previous decl of the same name. */
3424 tem = pushdecl (decl);
3426 /* For a local variable, define the RTL now. */
3427 if (current_binding_level != global_binding_level
3428 /* But not if this is a duplicate decl
3429 and we preserved the rtl from the previous one
3430 (which may or may not happen). */
3431 && !DECL_RTL_SET_P (tem)
3432 && !DECL_CONTEXT (tem))
3434 if (TREE_TYPE (tem) != error_mark_node
3435 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3437 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3438 && DECL_INITIAL (tem) != 0)
3445 /* Finish processing of a declaration;
3446 install its initial value.
3447 If the length of an array type is not known before,
3448 it must be determined now, from the initial value, or it is an error. */
3451 finish_decl (decl, init, asmspec_tree)
3455 tree type = TREE_TYPE (decl);
3456 int was_incomplete = (DECL_SIZE (decl) == 0);
3457 const char *asmspec = 0;
3459 /* If a name was specified, get the string. */
3460 if (current_binding_level == global_binding_level)
3461 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3463 asmspec = TREE_STRING_POINTER (asmspec_tree);
3465 /* If `start_decl' didn't like having an initialization, ignore it now. */
3466 if (init != 0 && DECL_INITIAL (decl) == 0)
3469 /* Don't crash if parm is initialized. */
3470 if (TREE_CODE (decl) == PARM_DECL)
3475 if (TREE_CODE (decl) != TYPE_DECL)
3476 store_init_value (decl, init);
3479 /* typedef foo = bar; store the type of bar as the type of foo. */
3480 TREE_TYPE (decl) = TREE_TYPE (init);
3481 DECL_INITIAL (decl) = init = 0;
3485 /* Deduce size of array from initialization, if not already known */
3486 if (TREE_CODE (type) == ARRAY_TYPE
3487 && TYPE_DOMAIN (type) == 0
3488 && TREE_CODE (decl) != TYPE_DECL)
3491 = (TREE_STATIC (decl)
3492 /* Even if pedantic, an external linkage array
3493 may have incomplete type at first. */
3494 ? pedantic && !TREE_PUBLIC (decl)
3495 : !DECL_EXTERNAL (decl));
3497 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3499 /* Get the completed type made by complete_array_type. */
3500 type = TREE_TYPE (decl);
3503 error_with_decl (decl, "initializer fails to determine size of `%s'");
3505 else if (failure == 2)
3508 error_with_decl (decl, "array size missing in `%s'");
3509 /* If a `static' var's size isn't known,
3510 make it extern as well as static, so it does not get
3512 If it is not `static', then do not mark extern;
3513 finish_incomplete_decl will give it a default size
3514 and it will get allocated. */
3515 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3516 DECL_EXTERNAL (decl) = 1;
3519 /* TYPE_MAX_VALUE is always one less than the number of elements
3520 in the array, because we start counting at zero. Therefore,
3521 warn only if the value is less than zero. */
3522 else if (pedantic && TYPE_DOMAIN (type) != 0
3523 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3524 error_with_decl (decl, "zero or negative size array `%s'");
3526 layout_decl (decl, 0);
3529 if (TREE_CODE (decl) == VAR_DECL)
3531 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3532 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3533 layout_decl (decl, 0);
3535 if (DECL_SIZE (decl) == 0
3536 /* Don't give an error if we already gave one earlier. */
3537 && TREE_TYPE (decl) != error_mark_node
3538 && (TREE_STATIC (decl)
3540 /* A static variable with an incomplete type
3541 is an error if it is initialized.
3542 Also if it is not file scope.
3543 Otherwise, let it through, but if it is not `extern'
3544 then it may cause an error message later. */
3545 (DECL_INITIAL (decl) != 0
3546 || DECL_CONTEXT (decl) != 0)
3548 /* An automatic variable with an incomplete type
3550 !DECL_EXTERNAL (decl)))
3552 error_with_decl (decl, "storage size of `%s' isn't known");
3553 TREE_TYPE (decl) = error_mark_node;
3556 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3557 && DECL_SIZE (decl) != 0)
3559 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3560 constant_expression_warning (DECL_SIZE (decl));
3562 error_with_decl (decl, "storage size of `%s' isn't constant");
3565 if (TREE_USED (type))
3566 TREE_USED (decl) = 1;
3569 /* If this is a function and an assembler name is specified, it isn't
3570 builtin any more. Also reset DECL_RTL so we can give it its new
3572 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3574 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3575 SET_DECL_RTL (decl, NULL_RTX);
3576 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3579 /* Output the assembler code and/or RTL code for variables and functions,
3580 unless the type is an undefined structure or union.
3581 If not, it will get done when the type is completed. */
3583 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3585 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3586 maybe_objc_check_decl (decl);
3588 if (!DECL_CONTEXT (decl))
3590 if (DECL_INITIAL (decl) == NULL_TREE
3591 || DECL_INITIAL (decl) == error_mark_node)
3592 /* Don't output anything
3593 when a tentative file-scope definition is seen.
3594 But at end of compilation, do output code for them. */
3595 DECL_DEFER_OUTPUT (decl) = 1;
3596 rest_of_decl_compilation (decl, asmspec,
3597 (DECL_CONTEXT (decl) == 0
3598 || TREE_ASM_WRITTEN (decl)), 0);
3602 /* This is a local variable. If there is an ASMSPEC, the
3603 user has requested that we handle it specially. */
3606 /* In conjunction with an ASMSPEC, the `register'
3607 keyword indicates that we should place the variable
3608 in a particular register. */
3609 if (DECL_REGISTER (decl))
3610 DECL_C_HARD_REGISTER (decl) = 1;
3612 /* If this is not a static variable, issue a warning.
3613 It doesn't make any sense to give an ASMSPEC for an
3614 ordinary, non-register local variable. Historically,
3615 GCC has accepted -- but ignored -- the ASMSPEC in
3617 if (TREE_CODE (decl) == VAR_DECL
3618 && !DECL_REGISTER (decl)
3619 && !TREE_STATIC (decl))
3620 warning_with_decl (decl,
3621 "ignoring asm-specifier for non-static local variable `%s'");
3623 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3626 if (TREE_CODE (decl) != FUNCTION_DECL)
3627 add_decl_stmt (decl);
3630 if (DECL_CONTEXT (decl) != 0)
3632 /* Recompute the RTL of a local array now
3633 if it used to be an incomplete type. */
3635 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3637 /* If we used it already as memory, it must stay in memory. */
3638 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3639 /* If it's still incomplete now, no init will save it. */
3640 if (DECL_SIZE (decl) == 0)
3641 DECL_INITIAL (decl) = 0;
3646 if (TREE_CODE (decl) == TYPE_DECL)
3648 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3649 maybe_objc_check_decl (decl);
3650 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3653 /* At the end of a declaration, throw away any variable type sizes
3654 of types defined inside that declaration. There is no use
3655 computing them in the following function definition. */
3656 if (current_binding_level == global_binding_level)
3657 get_pending_sizes ();
3660 /* If DECL has a cleanup, build and return that cleanup here.
3661 This is a callback called by expand_expr. */
3664 maybe_build_cleanup (decl)
3665 tree decl ATTRIBUTE_UNUSED;
3667 /* There are no cleanups in C. */
3671 /* Given a parsed parameter declaration,
3672 decode it into a PARM_DECL and push that on the current binding level.
3673 Also, for the sake of forward parm decls,
3674 record the given order of parms in `parm_order'. */
3677 push_parm_decl (parm)
3681 int old_immediate_size_expand = immediate_size_expand;
3682 /* Don't try computing parm sizes now -- wait till fn is called. */
3683 immediate_size_expand = 0;
3685 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3686 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3687 decl_attributes (&decl, TREE_VALUE (parm), 0);
3690 if (DECL_NAME (decl))
3693 olddecl = lookup_name (DECL_NAME (decl));
3694 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3695 pedwarn_with_decl (decl,
3696 "ISO C forbids parameter `%s' shadowing typedef");
3700 decl = pushdecl (decl);
3702 immediate_size_expand = old_immediate_size_expand;
3704 current_binding_level->parm_order
3705 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3707 /* Add this decl to the current binding level. */
3708 finish_decl (decl, NULL_TREE, NULL_TREE);
3711 /* Clear the given order of parms in `parm_order'.
3712 Used at start of parm list,
3713 and also at semicolon terminating forward decls. */
3718 current_binding_level->parm_order = NULL_TREE;
3721 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3722 literal, which may be an incomplete array type completed by the
3723 initializer; INIT is a CONSTRUCTOR that initializes the compound
3727 build_compound_literal (type, init)
3731 /* We do not use start_decl here because we have a type, not a declarator;
3732 and do not use finish_decl because the decl should be stored inside
3733 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3734 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3737 DECL_EXTERNAL (decl) = 0;
3738 TREE_PUBLIC (decl) = 0;
3739 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3740 DECL_CONTEXT (decl) = current_function_decl;
3741 TREE_USED (decl) = 1;
3742 TREE_TYPE (decl) = type;
3743 store_init_value (decl, init);
3745 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3747 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3752 type = TREE_TYPE (decl);
3753 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3754 return error_mark_node;
3756 stmt = build_stmt (DECL_STMT, decl);
3757 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3758 TREE_SIDE_EFFECTS (complit) = 1;
3760 layout_decl (decl, 0);
3762 if (TREE_STATIC (decl))
3764 /* This decl needs a name for the assembler output. We also need
3765 a unique suffix to be added to the name, for which DECL_CONTEXT
3767 DECL_NAME (decl) = get_identifier ("__compound_literal");
3768 DECL_CONTEXT (decl) = complit;
3769 rest_of_decl_compilation (decl, NULL, 1, 0);
3770 DECL_CONTEXT (decl) = NULL_TREE;
3776 /* Make TYPE a complete type based on INITIAL_VALUE.
3777 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3778 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3781 complete_array_type (type, initial_value, do_default)
3786 tree maxindex = NULL_TREE;
3791 /* Note MAXINDEX is really the maximum index,
3792 one less than the size. */
3793 if (TREE_CODE (initial_value) == STRING_CST)
3796 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3797 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3800 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3802 tree elts = CONSTRUCTOR_ELTS (initial_value);
3803 maxindex = build_int_2 (-1, -1);
3804 for (; elts; elts = TREE_CHAIN (elts))
3806 if (TREE_PURPOSE (elts))
3807 maxindex = TREE_PURPOSE (elts);
3809 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3810 maxindex, integer_one_node));
3812 maxindex = copy_node (maxindex);
3816 /* Make an error message unless that happened already. */
3817 if (initial_value != error_mark_node)
3820 /* Prevent further error messages. */
3821 maxindex = build_int_2 (0, 0);
3828 maxindex = build_int_2 (0, 0);
3834 TYPE_DOMAIN (type) = build_index_type (maxindex);
3835 if (!TREE_TYPE (maxindex))
3836 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3839 /* Lay out the type now that we can get the real answer. */
3846 /* Given declspecs and a declarator,
3847 determine the name and type of the object declared
3848 and construct a ..._DECL node for it.
3849 (In one case we can return a ..._TYPE node instead.
3850 For invalid input we sometimes return 0.)
3852 DECLSPECS is a chain of tree_list nodes whose value fields
3853 are the storage classes and type specifiers.
3855 DECL_CONTEXT says which syntactic context this declaration is in:
3856 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3857 FUNCDEF for a function definition. Like NORMAL but a few different
3858 error messages in each case. Return value may be zero meaning
3859 this definition is too screwy to try to parse.
3860 PARM for a parameter declaration (either within a function prototype
3861 or before a function body). Make a PARM_DECL, or return void_type_node.
3862 TYPENAME if for a typename (in a cast or sizeof).
3863 Don't make a DECL node; just return the ..._TYPE node.
3864 FIELD for a struct or union field; make a FIELD_DECL.
3865 BITFIELD for a field with specified width.
3866 INITIALIZED is 1 if the decl has an initializer.
3868 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3869 It may also be so in the PARM case, for a prototype where the
3870 argument type is specified but not the name.
3872 This function is where the complicated C meanings of `static'
3873 and `extern' are interpreted. */
3876 grokdeclarator (declarator, declspecs, decl_context, initialized)
3879 enum decl_context decl_context;
3884 tree type = NULL_TREE;
3889 int type_quals = TYPE_UNQUALIFIED;
3891 int explicit_int = 0;
3892 int explicit_char = 0;
3893 int defaulted_int = 0;
3894 tree typedef_decl = 0;
3896 tree typedef_type = 0;
3897 int funcdef_flag = 0;
3898 enum tree_code innermost_code = ERROR_MARK;
3900 int size_varies = 0;
3901 tree decl_attr = NULL_TREE;
3902 tree array_ptr_quals = NULL_TREE;
3903 int array_parm_static = 0;
3904 tree returned_attrs = NULL_TREE;
3906 if (decl_context == BITFIELD)
3907 bitfield = 1, decl_context = FIELD;
3909 if (decl_context == FUNCDEF)
3910 funcdef_flag = 1, decl_context = NORMAL;
3912 /* Look inside a declarator for the name being declared
3913 and get it as a string, for an error message. */
3915 tree decl = declarator;
3919 switch (TREE_CODE (decl))
3924 innermost_code = TREE_CODE (decl);
3925 decl = TREE_OPERAND (decl, 0);
3929 decl = TREE_VALUE (decl);
3932 case IDENTIFIER_NODE:
3933 name = IDENTIFIER_POINTER (decl);
3944 /* A function definition's declarator must have the form of
3945 a function declarator. */
3947 if (funcdef_flag && innermost_code != CALL_EXPR)
3950 /* Anything declared one level down from the top level
3951 must be one of the parameters of a function
3952 (because the body is at least two levels down). */
3954 /* If this looks like a function definition, make it one,
3955 even if it occurs where parms are expected.
3956 Then store_parm_decls will reject it and not use it as a parm. */
3957 if (decl_context == NORMAL && !funcdef_flag
3958 && current_binding_level->parm_flag)
3959 decl_context = PARM;
3961 /* Look through the decl specs and record which ones appear.
3962 Some typespecs are defined as built-in typenames.
3963 Others, the ones that are modifiers of other types,
3964 are represented by bits in SPECBITS: set the bits for
3965 the modifiers that appear. Storage class keywords are also in SPECBITS.
3967 If there is a typedef name or a type, store the type in TYPE.
3968 This includes builtin typedefs such as `int'.
3970 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3971 and did not come from a user typedef.
3973 Set LONGLONG if `long' is mentioned twice. */
3975 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3977 tree id = TREE_VALUE (spec);
3979 /* If the entire declaration is itself tagged as deprecated then
3980 suppress reports of deprecated items. */
3981 if (id && TREE_DEPRECATED (id))
3983 if (deprecated_state != DEPRECATED_SUPPRESS)
3984 warn_deprecated_use (id);
3987 if (id == ridpointers[(int) RID_INT])
3989 if (id == ridpointers[(int) RID_CHAR])
3992 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3994 enum rid i = C_RID_CODE (id);
3995 if ((int) i <= (int) RID_LAST_MODIFIER)
3997 if (i == RID_LONG && (specbits & (1 << (int) i)))
4000 error ("`long long long' is too long for GCC");
4003 if (pedantic && !flag_isoc99 && ! in_system_header
4005 pedwarn ("ISO C89 does not support `long long'");
4009 else if (specbits & (1 << (int) i))
4010 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4011 specbits |= 1 << (int) i;
4016 error ("two or more data types in declaration of `%s'", name);
4017 /* Actual typedefs come to us as TYPE_DECL nodes. */
4018 else if (TREE_CODE (id) == TYPE_DECL)
4020 if (TREE_TYPE (id) == error_mark_node)
4021 ; /* Allow the type to default to int to avoid cascading errors. */
4024 type = TREE_TYPE (id);
4025 decl_attr = DECL_ATTRIBUTES (id);
4029 /* Built-in types come as identifiers. */
4030 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4032 tree t = lookup_name (id);
4033 if (TREE_TYPE (t) == error_mark_node)
4035 else if (!t || TREE_CODE (t) != TYPE_DECL)
4036 error ("`%s' fails to be a typedef or built in type",
4037 IDENTIFIER_POINTER (id));
4040 type = TREE_TYPE (t);
4044 else if (TREE_CODE (id) != ERROR_MARK)
4051 typedef_type = type;
4053 size_varies = C_TYPE_VARIABLE_SIZE (type);
4055 /* No type at all: default to `int', and set DEFAULTED_INT
4056 because it was not a user-defined typedef. */
4060 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4061 | (1 << (int) RID_SIGNED)
4062 | (1 << (int) RID_UNSIGNED)
4063 | (1 << (int) RID_COMPLEX))))
4064 /* Don't warn about typedef foo = bar. */
4065 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4066 && ! in_system_header)
4068 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4069 and this is a function, or if -Wimplicit; prefer the former
4070 warning since it is more explicit. */
4071 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4073 warn_about_return_type = 1;
4074 else if (warn_implicit_int || flag_isoc99)
4075 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4080 type = integer_type_node;
4083 /* Now process the modifiers that were specified
4084 and check for invalid combinations. */
4086 /* Long double is a special combination. */
4088 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4089 && TYPE_MAIN_VARIANT (type) == double_type_node)
4091 specbits &= ~(1 << (int) RID_LONG);
4092 type = long_double_type_node;
4095 /* Check all other uses of type modifiers. */
4097 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4098 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4102 if ((specbits & 1 << (int) RID_LONG)
4103 && (specbits & 1 << (int) RID_SHORT))
4104 error ("both long and short specified for `%s'", name);
4105 else if (((specbits & 1 << (int) RID_LONG)
4106 || (specbits & 1 << (int) RID_SHORT))
4108 error ("long or short specified with char for `%s'", name);
4109 else if (((specbits & 1 << (int) RID_LONG)
4110 || (specbits & 1 << (int) RID_SHORT))
4111 && TREE_CODE (type) == REAL_TYPE)
4113 static int already = 0;
4115 error ("long or short specified with floating type for `%s'", name);
4116 if (! already && ! pedantic)
4118 error ("the only valid combination is `long double'");
4122 else if ((specbits & 1 << (int) RID_SIGNED)
4123 && (specbits & 1 << (int) RID_UNSIGNED))
4124 error ("both signed and unsigned specified for `%s'", name);
4125 else if (TREE_CODE (type) != INTEGER_TYPE)
4126 error ("long, short, signed or unsigned invalid for `%s'", name);
4130 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4132 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4134 if (flag_pedantic_errors)
4139 /* Discard the type modifiers if they are invalid. */
4142 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4143 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4148 if ((specbits & (1 << (int) RID_COMPLEX))
4149 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4151 error ("complex invalid for `%s'", name);
4152 specbits &= ~(1 << (int) RID_COMPLEX);
4155 /* Decide whether an integer type is signed or not.
4156 Optionally treat bitfields as signed by default. */
4157 if (specbits & 1 << (int) RID_UNSIGNED
4158 || (bitfield && ! flag_signed_bitfields
4159 && (explicit_int || defaulted_int || explicit_char
4160 /* A typedef for plain `int' without `signed'
4161 can be controlled just like plain `int'. */
4162 || ! (typedef_decl != 0
4163 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4164 && TREE_CODE (type) != ENUMERAL_TYPE
4165 && !(specbits & 1 << (int) RID_SIGNED)))
4168 type = long_long_unsigned_type_node;
4169 else if (specbits & 1 << (int) RID_LONG)
4170 type = long_unsigned_type_node;
4171 else if (specbits & 1 << (int) RID_SHORT)
4172 type = short_unsigned_type_node;
4173 else if (type == char_type_node)
4174 type = unsigned_char_type_node;
4175 else if (typedef_decl)
4176 type = unsigned_type (type);
4178 type = unsigned_type_node;
4180 else if ((specbits & 1 << (int) RID_SIGNED)
4181 && type == char_type_node)
4182 type = signed_char_type_node;
4184 type = long_long_integer_type_node;
4185 else if (specbits & 1 << (int) RID_LONG)
4186 type = long_integer_type_node;
4187 else if (specbits & 1 << (int) RID_SHORT)
4188 type = short_integer_type_node;
4190 if (specbits & 1 << (int) RID_COMPLEX)
4192 if (pedantic && !flag_isoc99)
4193 pedwarn ("ISO C89 does not support complex types");
4194 /* If we just have "complex", it is equivalent to
4195 "complex double", but if any modifiers at all are specified it is
4196 the complex form of TYPE. E.g, "complex short" is
4197 "complex short int". */
4199 if (defaulted_int && ! longlong
4200 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4201 | (1 << (int) RID_SIGNED)
4202 | (1 << (int) RID_UNSIGNED))))
4205 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4206 type = complex_double_type_node;
4208 else if (type == integer_type_node)
4211 pedwarn ("ISO C does not support complex integer types");
4212 type = complex_integer_type_node;
4214 else if (type == float_type_node)
4215 type = complex_float_type_node;
4216 else if (type == double_type_node)
4217 type = complex_double_type_node;
4218 else if (type == long_double_type_node)
4219 type = complex_long_double_type_node;
4223 pedwarn ("ISO C does not support complex integer types");
4224 type = build_complex_type (type);
4228 /* Figure out the type qualifiers for the declaration. There are
4229 two ways a declaration can become qualified. One is something
4230 like `const int i' where the `const' is explicit. Another is
4231 something like `typedef const int CI; CI i' where the type of the
4232 declaration contains the `const'. */
4233 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4234 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4235 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4236 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4237 if (constp > 1 && ! flag_isoc99)
4238 pedwarn ("duplicate `const'");
4239 if (restrictp > 1 && ! flag_isoc99)
4240 pedwarn ("duplicate `restrict'");
4241 if (volatilep > 1 && ! flag_isoc99)
4242 pedwarn ("duplicate `volatile'");
4243 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4244 type = TYPE_MAIN_VARIANT (type);
4245 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4246 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4247 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4249 /* Warn if two storage classes are given. Default to `auto'. */
4254 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4255 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4256 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4257 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4258 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4260 /* Warn about storage classes that are invalid for certain
4261 kinds of declarations (parameters, typenames, etc.). */
4264 error ("multiple storage classes in declaration of `%s'", name);
4265 else if (funcdef_flag
4267 & ((1 << (int) RID_REGISTER)
4268 | (1 << (int) RID_AUTO)
4269 | (1 << (int) RID_TYPEDEF))))
4271 if (specbits & 1 << (int) RID_AUTO
4272 && (pedantic || current_binding_level == global_binding_level))
4273 pedwarn ("function definition declared `auto'");
4274 if (specbits & 1 << (int) RID_REGISTER)
4275 error ("function definition declared `register'");
4276 if (specbits & 1 << (int) RID_TYPEDEF)
4277 error ("function definition declared `typedef'");
4278 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4279 | (1 << (int) RID_AUTO));
4281 else if (decl_context != NORMAL && nclasses > 0)
4283 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4287 switch (decl_context)
4290 error ("storage class specified for structure field `%s'",
4294 error ("storage class specified for parameter `%s'", name);
4297 error ("storage class specified for typename");
4300 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4301 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4302 | (1 << (int) RID_EXTERN));
4305 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4307 /* `extern' with initialization is invalid if not at top level. */
4308 if (current_binding_level == global_binding_level)
4309 warning ("`%s' initialized and declared `extern'", name);
4311 error ("`%s' has both `extern' and initializer", name);
4313 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4314 && current_binding_level != global_binding_level)
4315 error ("nested function `%s' declared `extern'", name);
4316 else if (current_binding_level == global_binding_level
4317 && specbits & (1 << (int) RID_AUTO))
4318 error ("top-level declaration of `%s' specifies `auto'", name);
4321 /* Now figure out the structure of the declarator proper.
4322 Descend through it, creating more complex types, until we reach
4323 the declared identifier (or NULL_TREE, in an absolute declarator). */
4325 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4327 if (type == error_mark_node)
4329 declarator = TREE_OPERAND (declarator, 0);
4333 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4334 an INDIRECT_REF (for *...),
4335 a CALL_EXPR (for ...(...)),
4336 a TREE_LIST (for nested attributes),
4337 an identifier (for the name being declared)
4338 or a null pointer (for the place in an absolute declarator
4339 where the name was omitted).
4340 For the last two cases, we have just exited the loop.
4342 At this point, TYPE is the type of elements of an array,
4343 or for a function to return, or for a pointer to point to.
4344 After this sequence of ifs, TYPE is the type of the
4345 array or function or pointer, and DECLARATOR has had its
4346 outermost layer removed. */
4348 if (array_ptr_quals != NULL_TREE || array_parm_static)
4350 /* Only the innermost declarator (making a parameter be of
4351 array type which is converted to pointer type)
4352 may have static or type qualifiers. */
4353 error ("static or type qualifiers in non-parameter array declarator");
4354 array_ptr_quals = NULL_TREE;
4355 array_parm_static = 0;
4358 if (TREE_CODE (declarator) == TREE_LIST)
4360 /* We encode a declarator with embedded attributes using
4362 tree attrs = TREE_PURPOSE (declarator);
4365 declarator = TREE_VALUE (declarator);
4366 inner_decl = declarator;
4367 while (inner_decl != NULL_TREE
4368 && TREE_CODE (inner_decl) == TREE_LIST)
4369 inner_decl = TREE_VALUE (inner_decl);
4370 if (inner_decl == NULL_TREE
4371 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4372 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4373 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4374 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4375 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4376 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4377 returned_attrs = decl_attributes (&type,
4378 chainon (returned_attrs, attrs),
4381 else if (TREE_CODE (declarator) == ARRAY_REF)
4383 tree itype = NULL_TREE;
4384 tree size = TREE_OPERAND (declarator, 1);
4385 /* The index is a signed object `sizetype' bits wide. */
4386 tree index_type = signed_type (sizetype);
4388 array_ptr_quals = TREE_TYPE (declarator);
4389 array_parm_static = TREE_STATIC (declarator);
4391 declarator = TREE_OPERAND (declarator, 0);
4393 /* Check for some types that there cannot be arrays of. */
4395 if (VOID_TYPE_P (type))
4397 error ("declaration of `%s' as array of voids", name);
4398 type = error_mark_node;
4401 if (TREE_CODE (type) == FUNCTION_TYPE)
4403 error ("declaration of `%s' as array of functions", name);
4404 type = error_mark_node;
4407 if (size == error_mark_node)
4408 type = error_mark_node;
4410 if (type == error_mark_node)
4413 /* If size was specified, set ITYPE to a range-type for that size.
4414 Otherwise, ITYPE remains null. finish_decl may figure it out
4415 from an initial value. */
4419 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4420 STRIP_TYPE_NOPS (size);
4422 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4424 error ("size of array `%s' has non-integer type", name);
4425 size = integer_one_node;
4428 if (pedantic && integer_zerop (size))
4429 pedwarn ("ISO C forbids zero-size array `%s'", name);
4431 if (TREE_CODE (size) == INTEGER_CST)
4433 constant_expression_warning (size);
4434 if (tree_int_cst_sgn (size) < 0)
4436 error ("size of array `%s' is negative", name);
4437 size = integer_one_node;
4442 /* Make sure the array size remains visibly nonconstant
4443 even if it is (eg) a const variable with known value. */
4448 if (TREE_CONSTANT (size))
4449 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4452 pedwarn ("ISO C89 forbids variable-size array `%s'",
4457 if (integer_zerop (size))
4459 /* A zero-length array cannot be represented with an
4460 unsigned index type, which is what we'll get with
4461 build_index_type. Create an open-ended range instead. */
4462 itype = build_range_type (sizetype, size, NULL_TREE);
4466 /* Compute the maximum valid index, that is, size - 1.
4467 Do the calculation in index_type, so that if it is
4468 a variable the computations will be done in the
4470 itype = fold (build (MINUS_EXPR, index_type,
4471 convert (index_type, size),
4472 convert (index_type, size_one_node)));
4474 /* If that overflowed, the array is too big.
4475 ??? While a size of INT_MAX+1 technically shouldn't
4476 cause an overflow (because we subtract 1), the overflow
4477 is recorded during the conversion to index_type, before
4478 the subtraction. Handling this case seems like an
4479 unnecessary complication. */
4480 if (TREE_OVERFLOW (itype))
4482 error ("size of array `%s' is too large", name);
4483 type = error_mark_node;
4488 itype = variable_size (itype);
4489 itype = build_index_type (itype);
4492 else if (decl_context == FIELD)
4494 /* ??? Need to check somewhere that this is a structure
4495 and not a union, that this field is last, and that
4496 this structure has at least one other named member. */
4498 if (pedantic && !flag_isoc99 && !in_system_header)
4499 pedwarn ("ISO C89 does not support flexible array members");
4501 /* ISO C99 Flexible array members are effectively identical
4502 to GCC's zero-length array extension. */
4503 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4506 /* If pedantic, complain about arrays of incomplete types. */
4508 if (pedantic && !COMPLETE_TYPE_P (type))
4509 pedwarn ("array type has incomplete element type");
4512 /* We shouldn't have a function type here at all!
4513 Functions aren't allowed as array elements. */
4514 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4515 && (constp || volatilep))
4516 pedwarn ("ISO C forbids const or volatile function types");
4519 /* Build the array type itself, then merge any constancy or
4520 volatility into the target type. We must do it in this order
4521 to ensure that the TYPE_MAIN_VARIANT field of the array type
4522 is set correctly. */
4524 type = build_array_type (type, itype);
4526 type = c_build_qualified_type (type, type_quals);
4529 C_TYPE_VARIABLE_SIZE (type) = 1;
4531 /* The GCC extension for zero-length arrays differs from
4532 ISO flexible array members in that sizeof yields zero. */
4533 if (size && integer_zerop (size))
4536 TYPE_SIZE (type) = bitsize_zero_node;
4537 TYPE_SIZE_UNIT (type) = size_zero_node;
4539 if (decl_context != PARM
4540 && (array_ptr_quals != NULL_TREE || array_parm_static))
4542 error ("static or type qualifiers in non-parameter array declarator");
4543 array_ptr_quals = NULL_TREE;
4544 array_parm_static = 0;
4547 else if (TREE_CODE (declarator) == CALL_EXPR)
4551 /* Declaring a function type.
4552 Make sure we have a valid type for the function to return. */
4553 if (type == error_mark_node)
4558 /* Warn about some types functions can't return. */
4560 if (TREE_CODE (type) == FUNCTION_TYPE)
4562 error ("`%s' declared as function returning a function", name);
4563 type = integer_type_node;
4565 if (TREE_CODE (type) == ARRAY_TYPE)
4567 error ("`%s' declared as function returning an array", name);
4568 type = integer_type_node;
4571 /* Construct the function type and go to the next
4572 inner layer of declarator. */
4574 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4576 /* Say it's a definition
4577 only for the CALL_EXPR
4578 closest to the identifier. */
4579 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4580 /* Type qualifiers before the return type of the function
4581 qualify the return type, not the function type. */
4584 /* Type qualifiers on a function return type are normally
4585 permitted by the standard but have no effect, so give a
4586 warning at -W. Qualifiers on a void return type have
4587 meaning as a GNU extension, and are banned on function
4588 definitions in ISO C. FIXME: strictly we shouldn't
4589 pedwarn for qualified void return types except on function
4590 definitions, but not doing so could lead to the undesirable
4591 state of a "volatile void" function return type not being
4592 warned about, and a use of the function being compiled
4593 with GNU semantics, with no diagnostics under -pedantic. */
4594 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4595 pedwarn ("ISO C forbids qualified void function return type");
4596 else if (extra_warnings
4597 && !(VOID_TYPE_P (type)
4598 && type_quals == TYPE_QUAL_VOLATILE))
4599 warning ("type qualifiers ignored on function return type");
4601 type = c_build_qualified_type (type, type_quals);
4603 type_quals = TYPE_UNQUALIFIED;
4605 type = build_function_type (type, arg_types);
4606 declarator = TREE_OPERAND (declarator, 0);
4608 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4609 the formal parameter list of this FUNCTION_TYPE to point to
4610 the FUNCTION_TYPE node itself. */
4615 for (link = last_function_parm_tags;
4617 link = TREE_CHAIN (link))
4618 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4621 else if (TREE_CODE (declarator) == INDIRECT_REF)
4623 /* Merge any constancy or volatility into the target type
4626 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4628 pedwarn ("ISO C forbids qualified function types");
4630 type = c_build_qualified_type (type, type_quals);
4631 type_quals = TYPE_UNQUALIFIED;
4634 type = build_pointer_type (type);
4636 /* Process a list of type modifier keywords
4637 (such as const or volatile) that were given inside the `*'. */
4639 if (TREE_TYPE (declarator))
4647 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4648 typemodlist = TREE_CHAIN (typemodlist))
4650 tree qualifier = TREE_VALUE (typemodlist);
4652 if (C_IS_RESERVED_WORD (qualifier))
4654 if (C_RID_CODE (qualifier) == RID_CONST)
4656 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4658 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4668 error ("invalid type modifier within pointer declarator");
4669 if (constp > 1 && ! flag_isoc99)
4670 pedwarn ("duplicate `const'");
4671 if (volatilep > 1 && ! flag_isoc99)
4672 pedwarn ("duplicate `volatile'");
4673 if (restrictp > 1 && ! flag_isoc99)
4674 pedwarn ("duplicate `restrict'");
4676 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4677 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4678 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4681 declarator = TREE_OPERAND (declarator, 0);
4688 /* Now TYPE has the actual type. */
4690 /* Did array size calculations overflow? */
4692 if (TREE_CODE (type) == ARRAY_TYPE
4693 && COMPLETE_TYPE_P (type)
4694 && TREE_OVERFLOW (TYPE_SIZE (type)))
4696 error ("size of array `%s' is too large", name);
4697 /* If we proceed with the array type as it is, we'll eventually
4698 crash in tree_low_cst(). */
4699 type = error_mark_node;
4702 /* If this is declaring a typedef name, return a TYPE_DECL. */
4704 if (specbits & (1 << (int) RID_TYPEDEF))
4707 /* Note that the grammar rejects storage classes
4708 in typenames, fields or parameters */
4709 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4711 pedwarn ("ISO C forbids qualified function types");
4713 type = c_build_qualified_type (type, type_quals);
4714 decl = build_decl (TYPE_DECL, declarator, type);
4715 if ((specbits & (1 << (int) RID_SIGNED))
4716 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4717 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4718 decl_attributes (&decl, returned_attrs, 0);
4722 /* Detect the case of an array type of unspecified size
4723 which came, as such, direct from a typedef name.
4724 We must copy the type, so that each identifier gets
4725 a distinct type, so that each identifier's size can be
4726 controlled separately by its own initializer. */
4728 if (type != 0 && typedef_type != 0
4729 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4730 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4732 type = build_array_type (TREE_TYPE (type), 0);
4734 C_TYPE_VARIABLE_SIZE (type) = 1;
4737 /* If this is a type name (such as, in a cast or sizeof),
4738 compute the type and return it now. */
4740 if (decl_context == TYPENAME)
4742 /* Note that the grammar rejects storage classes
4743 in typenames, fields or parameters */
4744 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4746 pedwarn ("ISO C forbids const or volatile function types");
4748 type = c_build_qualified_type (type, type_quals);
4749 decl_attributes (&type, returned_attrs, 0);
4753 /* Aside from typedefs and type names (handle above),
4754 `void' at top level (not within pointer)
4755 is allowed only in public variables.
4756 We don't complain about parms either, but that is because
4757 a better error message can be made later. */
4759 if (VOID_TYPE_P (type) && decl_context != PARM
4760 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4761 && ((specbits & (1 << (int) RID_EXTERN))
4762 || (current_binding_level == global_binding_level
4764 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4766 error ("variable or field `%s' declared void", name);
4767 type = integer_type_node;
4770 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4771 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4776 if (decl_context == PARM)
4778 tree type_as_written;
4781 /* A parameter declared as an array of T is really a pointer to T.
4782 One declared as a function is really a pointer to a function. */
4784 if (TREE_CODE (type) == ARRAY_TYPE)
4786 /* Transfer const-ness of array into that of type pointed to. */
4787 type = TREE_TYPE (type);
4789 type = c_build_qualified_type (type, type_quals);
4790 type = build_pointer_type (type);
4791 type_quals = TYPE_UNQUALIFIED;
4792 if (array_ptr_quals)
4794 tree new_ptr_quals, new_ptr_attrs;
4796 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4797 /* We don't yet implement attributes in this context. */
4798 if (new_ptr_attrs != NULL_TREE)
4799 warning ("attributes in parameter array declarator ignored");
4804 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4806 tree qualifier = TREE_VALUE (new_ptr_quals);
4808 if (C_IS_RESERVED_WORD (qualifier))
4810 if (C_RID_CODE (qualifier) == RID_CONST)
4812 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4814 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4824 error ("invalid type modifier within array declarator");
4826 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4827 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4828 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4832 else if (TREE_CODE (type) == FUNCTION_TYPE)
4834 if (pedantic && type_quals)
4835 pedwarn ("ISO C forbids qualified function types");
4837 type = c_build_qualified_type (type, type_quals);
4838 type = build_pointer_type (type);
4839 type_quals = TYPE_UNQUALIFIED;
4841 else if (type_quals)
4842 type = c_build_qualified_type (type, type_quals);
4844 type_as_written = type;
4846 decl = build_decl (PARM_DECL, declarator, type);
4848 C_DECL_VARIABLE_SIZE (decl) = 1;
4850 /* Compute the type actually passed in the parmlist,
4851 for the case where there is no prototype.
4852 (For example, shorts and chars are passed as ints.)
4853 When there is a prototype, this is overridden later. */
4855 if (type == error_mark_node)
4856 promoted_type = type;
4859 promoted_type = simple_type_promotes_to (type);
4860 if (! promoted_type)
4861 promoted_type = type;
4864 DECL_ARG_TYPE (decl) = promoted_type;
4865 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4867 else if (decl_context == FIELD)
4869 /* Structure field. It may not be a function. */
4871 if (TREE_CODE (type) == FUNCTION_TYPE)
4873 error ("field `%s' declared as a function", name);
4874 type = build_pointer_type (type);
4876 else if (TREE_CODE (type) != ERROR_MARK
4877 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4879 error ("field `%s' has incomplete type", name);
4880 type = error_mark_node;
4882 /* Move type qualifiers down to element of an array. */
4883 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4885 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4887 TYPE_DOMAIN (type));
4889 /* Leave the field const or volatile as well. */
4890 type_quals = TYPE_UNQUALIFIED;
4893 decl = build_decl (FIELD_DECL, declarator, type);
4894 DECL_NONADDRESSABLE_P (decl) = bitfield;
4897 C_DECL_VARIABLE_SIZE (decl) = 1;
4899 else if (TREE_CODE (type) == FUNCTION_TYPE)
4901 /* Every function declaration is "external"
4902 except for those which are inside a function body
4903 in which `auto' is used.
4904 That is a case not specified by ANSI C,
4905 and we use it for forward declarations for nested functions. */
4906 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4907 || current_binding_level == global_binding_level);
4909 if (specbits & (1 << (int) RID_AUTO)
4910 && (pedantic || current_binding_level == global_binding_level))
4911 pedwarn ("invalid storage class for function `%s'", name);
4912 if (specbits & (1 << (int) RID_REGISTER))
4913 error ("invalid storage class for function `%s'", name);
4914 /* Function declaration not at top level.
4915 Storage classes other than `extern' are not allowed
4916 and `extern' makes no difference. */
4917 if (current_binding_level != global_binding_level
4918 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4920 pedwarn ("invalid storage class for function `%s'", name);
4922 decl = build_decl (FUNCTION_DECL, declarator, type);
4923 decl = build_decl_attribute_variant (decl, decl_attr);
4925 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4926 ggc_alloc_cleared (sizeof (struct lang_decl));
4928 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4929 pedwarn ("ISO C forbids qualified function types");
4931 /* GNU C interprets a `volatile void' return type to indicate
4932 that the function does not return. */
4933 if ((type_quals & TYPE_QUAL_VOLATILE)
4934 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4935 warning ("`noreturn' function returns non-void value");
4938 DECL_EXTERNAL (decl) = 1;
4939 /* Record absence of global scope for `static' or `auto'. */
4941 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4944 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4946 /* Record presence of `inline', if it is reasonable. */
4947 if (MAIN_NAME_P (declarator))
4950 warning ("cannot inline function `main'");
4954 /* Assume that otherwise the function can be inlined. */
4955 DECL_DECLARED_INLINE_P (decl) = 1;
4957 /* Do not mark bare declarations as DECL_INLINE. Doing so
4958 in the presence of multiple declarations can result in
4959 the abstract origin pointing between the declarations,
4960 which will confuse dwarf2out. */
4963 DECL_INLINE (decl) = 1;
4964 if (specbits & (1 << (int) RID_EXTERN))
4965 current_extern_inline = 1;
4968 /* If -finline-functions, assume it can be inlined. This does
4969 two things: let the function be deferred until it is actually
4970 needed, and let dwarf2 know that the function is inlinable. */
4971 else if (flag_inline_trees == 2 && initialized)
4973 DECL_INLINE (decl) = 1;
4974 DECL_DECLARED_INLINE_P (decl) = 0;
4979 /* It's a variable. */
4980 /* An uninitialized decl with `extern' is a reference. */
4981 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4983 /* Move type qualifiers down to element of an array. */
4984 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4986 int saved_align = TYPE_ALIGN(type);
4987 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4989 TYPE_DOMAIN (type));
4990 TYPE_ALIGN (type) = saved_align;
4991 #if 0 /* Leave the variable const or volatile as well. */
4992 type_quals = TYPE_UNQUALIFIED;
4995 else if (type_quals)
4996 type = c_build_qualified_type (type, type_quals);
4998 decl = build_decl (VAR_DECL, declarator, type);
5000 C_DECL_VARIABLE_SIZE (decl) = 1;
5003 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5005 DECL_EXTERNAL (decl) = extern_ref;
5006 /* At top level, the presence of a `static' or `register' storage
5007 class specifier, or the absence of all storage class specifiers
5008 makes this declaration a definition (perhaps tentative). Also,
5009 the absence of both `static' and `register' makes it public. */
5010 if (current_binding_level == global_binding_level)
5014 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5015 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5017 /* Not at top level, only `static' makes a static definition. */
5020 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5021 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5025 /* Record `register' declaration for warnings on &
5026 and in case doing stupid register allocation. */
5028 if (specbits & (1 << (int) RID_REGISTER))
5029 DECL_REGISTER (decl) = 1;
5031 /* Record constancy and volatility. */
5032 c_apply_type_quals_to_decl (type_quals, decl);
5034 /* If a type has volatile components, it should be stored in memory.
5035 Otherwise, the fact that those components are volatile
5036 will be ignored, and would even crash the compiler. */
5037 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5038 mark_addressable (decl);
5040 decl_attributes (&decl, returned_attrs, 0);
5046 /* Decode the parameter-list info for a function type or function definition.
5047 The argument is the value returned by `get_parm_info' (or made in parse.y
5048 if there is an identifier list instead of a parameter decl list).
5049 These two functions are separate because when a function returns
5050 or receives functions then each is called multiple times but the order
5051 of calls is different. The last call to `grokparms' is always the one
5052 that contains the formal parameter names of a function definition.
5054 Store in `last_function_parms' a chain of the decls of parms.
5055 Also store in `last_function_parm_tags' a chain of the struct, union,
5056 and enum tags declared among the parms.
5058 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5060 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5061 a mere declaration. A nonempty identifier-list gets an error message
5062 when FUNCDEF_FLAG is zero. */
5065 grokparms (parms_info, funcdef_flag)
5069 tree first_parm = TREE_CHAIN (parms_info);
5071 last_function_parms = TREE_PURPOSE (parms_info);
5072 last_function_parm_tags = TREE_VALUE (parms_info);
5074 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5075 && !in_system_header)
5076 warning ("function declaration isn't a prototype");
5079 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5082 pedwarn ("parameter names (without types) in function declaration");
5084 last_function_parms = first_parm;
5091 /* We no longer test FUNCDEF_FLAG.
5092 If the arg types are incomplete in a declaration,
5093 they must include undefined tags.
5094 These tags can never be defined in the scope of the declaration,
5095 so the types can never be completed,
5096 and no call can be compiled successfully. */
5098 /* In a fcn definition, arg types must be complete. */
5101 for (parm = last_function_parms, typelt = first_parm;
5103 parm = TREE_CHAIN (parm))
5104 /* Skip over any enumeration constants declared here. */
5105 if (TREE_CODE (parm) == PARM_DECL)
5107 /* Barf if the parameter itself has an incomplete type. */
5108 tree type = TREE_VALUE (typelt);
5109 if (type == error_mark_node)
5111 if (!COMPLETE_TYPE_P (type))
5113 if (funcdef_flag && DECL_NAME (parm) != 0)
5114 error ("parameter `%s' has incomplete type",
5115 IDENTIFIER_POINTER (DECL_NAME (parm)));
5117 warning ("parameter has incomplete type");
5120 TREE_VALUE (typelt) = error_mark_node;
5121 TREE_TYPE (parm) = error_mark_node;
5125 /* This has been replaced by parm_tags_warning, which
5126 uses a more accurate criterion for what to warn
5130 /* Now warn if is a pointer to an incomplete type. */
5131 while (TREE_CODE (type) == POINTER_TYPE
5132 || TREE_CODE (type) == REFERENCE_TYPE)
5133 type = TREE_TYPE (type);
5134 type = TYPE_MAIN_VARIANT (type);
5135 if (!COMPLETE_TYPE_P (type))
5137 if (DECL_NAME (parm) != 0)
5138 warning ("parameter `%s' points to incomplete type",
5139 IDENTIFIER_POINTER (DECL_NAME (parm)));
5141 warning ("parameter points to incomplete type");
5145 typelt = TREE_CHAIN (typelt);
5152 /* Return a tree_list node with info on a parameter list just parsed.
5153 The TREE_PURPOSE is a chain of decls of those parms.
5154 The TREE_VALUE is a list of structure, union and enum tags defined.
5155 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5156 This tree_list node is later fed to `grokparms'.
5158 VOID_AT_END nonzero means append `void' to the end of the type-list.
5159 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5162 get_parm_info (void_at_end)
5168 tree tags = gettags ();
5169 tree parms = getdecls ();
5171 tree order = current_binding_level->parm_order;
5173 /* Just `void' (and no ellipsis) is special. There are really no parms.
5174 But if the `void' is qualified (by `const' or `volatile') or has a
5175 storage class specifier (`register'), then the behavior is undefined;
5176 by not counting it as the special case of `void' we will cause an
5177 error later. Typedefs for `void' are OK (see DR#157). */
5178 if (void_at_end && parms != 0
5179 && TREE_CHAIN (parms) == 0
5180 && VOID_TYPE_P (TREE_TYPE (parms))
5181 && ! TREE_THIS_VOLATILE (parms)
5182 && ! TREE_READONLY (parms)
5183 && ! DECL_REGISTER (parms)
5184 && DECL_NAME (parms) == 0)
5187 storedecls (NULL_TREE);
5188 return tree_cons (NULL_TREE, NULL_TREE,
5189 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5192 /* Extract enumerator values and other non-parms declared with the parms.
5193 Likewise any forward parm decls that didn't have real parm decls. */
5194 for (decl = parms; decl;)
5196 tree next = TREE_CHAIN (decl);
5198 if (TREE_CODE (decl) != PARM_DECL)
5200 TREE_CHAIN (decl) = new_parms;
5203 else if (TREE_ASM_WRITTEN (decl))
5205 error_with_decl (decl,
5206 "parameter `%s' has just a forward declaration");
5207 TREE_CHAIN (decl) = new_parms;
5213 /* Put the parm decls back in the order they were in in the parm list. */
5214 for (t = order; t; t = TREE_CHAIN (t))
5217 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5219 TREE_CHAIN (TREE_VALUE (t)) = 0;
5222 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5225 /* Store the parmlist in the binding level since the old one
5226 is no longer a valid list. (We have changed the chain pointers.) */
5227 storedecls (new_parms);
5229 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5230 /* There may also be declarations for enumerators if an enumeration
5231 type is declared among the parms. Ignore them here. */
5232 if (TREE_CODE (decl) == PARM_DECL)
5234 /* Since there is a prototype,
5235 args are passed in their declared types. */
5236 tree type = TREE_TYPE (decl);
5237 DECL_ARG_TYPE (decl) = type;
5238 if (PROMOTE_PROTOTYPES
5239 && INTEGRAL_TYPE_P (type)
5240 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5241 DECL_ARG_TYPE (decl) = integer_type_node;
5243 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5244 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5245 && DECL_NAME (decl) == 0)
5247 error ("`void' in parameter list must be the entire list");
5253 return tree_cons (new_parms, tags,
5254 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5256 return tree_cons (new_parms, tags, nreverse (types));
5259 /* At end of parameter list, warn about any struct, union or enum tags
5260 defined within. Do so because these types cannot ever become complete. */
5263 parmlist_tags_warning ()
5268 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5270 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5271 /* An anonymous union parm type is meaningful as a GNU extension.
5272 So don't warn for that. */
5273 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5275 if (TREE_PURPOSE (elt) != 0)
5277 if (code == RECORD_TYPE)
5278 warning ("`struct %s' declared inside parameter list",
5279 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5280 else if (code == UNION_TYPE)
5281 warning ("`union %s' declared inside parameter list",
5282 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5284 warning ("`enum %s' declared inside parameter list",
5285 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5289 /* For translation these need to be separate warnings */
5290 if (code == RECORD_TYPE)
5291 warning ("anonymous struct declared inside parameter list");
5292 else if (code == UNION_TYPE)
5293 warning ("anonymous union declared inside parameter list");
5295 warning ("anonymous enum declared inside parameter list");
5299 warning ("its scope is only this definition or declaration, which is probably not what you want");
5305 /* Get the struct, enum or union (CODE says which) with tag NAME.
5306 Define the tag as a forward-reference if it is not defined. */
5309 xref_tag (code, name)
5310 enum tree_code code;
5313 /* If a cross reference is requested, look up the type
5314 already defined for this tag and return it. */
5316 tree ref = lookup_tag (code, name, current_binding_level, 0);
5317 /* If this is the right type of tag, return what we found.
5318 (This reference will be shadowed by shadow_tag later if appropriate.)
5319 If this is the wrong type of tag, do not return it. If it was the
5320 wrong type in the same binding level, we will have had an error
5321 message already; if in a different binding level and declaring
5322 a name, pending_xref_error will give an error message; but if in a
5323 different binding level and not declaring a name, this tag should
5324 shadow the previous declaration of a different type of tag, and
5325 this would not work properly if we return the reference found.
5326 (For example, with "struct foo" in an outer scope, "union foo;"
5327 must shadow that tag with a new one of union type.) */
5328 if (ref && TREE_CODE (ref) == code)
5331 /* If no such tag is yet defined, create a forward-reference node
5332 and record it as the "definition".
5333 When a real declaration of this type is found,
5334 the forward-reference will be altered into a real type. */
5336 ref = make_node (code);
5337 if (code == ENUMERAL_TYPE)
5339 /* Give the type a default layout like unsigned int
5340 to avoid crashing if it does not get defined. */
5341 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5342 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5343 TYPE_USER_ALIGN (ref) = 0;
5344 TREE_UNSIGNED (ref) = 1;
5345 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5346 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5347 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5350 pushtag (name, ref);
5355 /* Make sure that the tag NAME is defined *in the current binding level*
5356 at least as a forward reference.
5357 CODE says which kind of tag NAME ought to be. */
5360 start_struct (code, name)
5361 enum tree_code code;
5364 /* If there is already a tag defined at this binding level
5365 (as a forward reference), just return it. */
5370 ref = lookup_tag (code, name, current_binding_level, 1);
5371 if (ref && TREE_CODE (ref) == code)
5373 C_TYPE_BEING_DEFINED (ref) = 1;
5374 TYPE_PACKED (ref) = flag_pack_struct;
5375 if (TYPE_FIELDS (ref))
5377 if (code == UNION_TYPE)
5378 error ("redefinition of `union %s'",
5379 IDENTIFIER_POINTER (name));
5381 error ("redefinition of `struct %s'",
5382 IDENTIFIER_POINTER (name));
5388 /* Otherwise create a forward-reference just so the tag is in scope. */
5390 ref = make_node (code);
5391 pushtag (name, ref);
5392 C_TYPE_BEING_DEFINED (ref) = 1;
5393 TYPE_PACKED (ref) = flag_pack_struct;
5397 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5398 of a structure component, returning a FIELD_DECL node.
5399 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5401 This is done during the parsing of the struct declaration.
5402 The FIELD_DECL nodes are chained together and the lot of them
5403 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5406 grokfield (filename, line, declarator, declspecs, width)
5407 const char *filename ATTRIBUTE_UNUSED;
5408 int line ATTRIBUTE_UNUSED;
5409 tree declarator, declspecs, width;
5413 if (declarator == NULL_TREE && width == NULL_TREE)
5415 /* This is an unnamed decl. We only support unnamed
5416 structs/unions, so check for other things and refuse them. */
5417 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5418 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5420 error ("unnamed fields of type other than struct or union are not allowed");
5425 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5427 finish_decl (value, NULL_TREE, NULL_TREE);
5428 DECL_INITIAL (value) = width;
5430 maybe_objc_check_decl (value);
5434 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5435 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5436 ATTRIBUTES are attributes to be applied to the structure. */
5439 finish_struct (t, fieldlist, attributes)
5445 int toplevel = global_binding_level == current_binding_level;
5446 int saw_named_field;
5448 /* If this type was previously laid out as a forward reference,
5449 make sure we lay it out again. */
5453 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5455 /* Nameless union parm types are useful as GCC extension. */
5456 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5457 /* Otherwise, warn about any struct or union def. in parmlist. */
5458 if (in_parm_level_p ())
5461 pedwarn ("%s defined inside parms",
5462 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5464 warning ("%s defined inside parms",
5465 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5470 for (x = fieldlist; x; x = TREE_CHAIN (x))
5471 if (DECL_NAME (x) != 0)
5475 pedwarn ("%s has no %s",
5476 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5477 fieldlist ? _("named members") : _("members"));
5480 /* Install struct as DECL_CONTEXT of each field decl.
5481 Also process specified field sizes,m which is found in the DECL_INITIAL.
5482 Store 0 there, except for ": 0" fields (so we can find them
5483 and delete them, below). */
5485 saw_named_field = 0;
5486 for (x = fieldlist; x; x = TREE_CHAIN (x))
5488 DECL_CONTEXT (x) = t;
5489 DECL_PACKED (x) |= TYPE_PACKED (t);
5491 /* If any field is const, the structure type is pseudo-const. */
5492 if (TREE_READONLY (x))
5493 C_TYPE_FIELDS_READONLY (t) = 1;
5496 /* A field that is pseudo-const makes the structure likewise. */
5497 tree t1 = TREE_TYPE (x);
5498 while (TREE_CODE (t1) == ARRAY_TYPE)
5499 t1 = TREE_TYPE (t1);
5500 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5501 && C_TYPE_FIELDS_READONLY (t1))
5502 C_TYPE_FIELDS_READONLY (t) = 1;
5505 /* Any field that is volatile means variables of this type must be
5506 treated in some ways as volatile. */
5507 if (TREE_THIS_VOLATILE (x))
5508 C_TYPE_FIELDS_VOLATILE (t) = 1;
5510 /* Any field of nominal variable size implies structure is too. */
5511 if (C_DECL_VARIABLE_SIZE (x))
5512 C_TYPE_VARIABLE_SIZE (t) = 1;
5514 /* Detect invalid nested redefinition. */
5515 if (TREE_TYPE (x) == t)
5516 error ("nested redefinition of `%s'",
5517 IDENTIFIER_POINTER (TYPE_NAME (t)));
5519 /* Detect invalid bit-field size. */
5520 if (DECL_INITIAL (x))
5521 STRIP_NOPS (DECL_INITIAL (x));
5522 if (DECL_INITIAL (x))
5524 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5525 constant_expression_warning (DECL_INITIAL (x));
5529 "bit-field `%s' width not an integer constant");
5530 DECL_INITIAL (x) = NULL;
5534 /* Detect invalid bit-field type. */
5535 if (DECL_INITIAL (x)
5536 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5537 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5538 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5540 error_with_decl (x, "bit-field `%s' has invalid type");
5541 DECL_INITIAL (x) = NULL;
5544 if (DECL_INITIAL (x) && pedantic
5545 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5546 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5547 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5548 /* Accept an enum that's equivalent to int or unsigned int. */
5549 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5550 && (TYPE_PRECISION (TREE_TYPE (x))
5551 == TYPE_PRECISION (integer_type_node))))
5552 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5554 /* Detect and ignore out of range field width and process valid
5556 if (DECL_INITIAL (x))
5559 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5560 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5562 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5563 error_with_decl (x, "negative width in bit-field `%s'");
5564 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5565 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5566 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5567 error_with_decl (x, "zero width for bit-field `%s'");
5570 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5571 unsigned HOST_WIDE_INT width
5572 = tree_low_cst (DECL_INITIAL (x), 1);
5574 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5575 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5576 TREE_UNSIGNED (TREE_TYPE (x)))
5578 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5579 TREE_UNSIGNED (TREE_TYPE (x))))))
5580 warning_with_decl (x,
5581 "`%s' is narrower than values of its type");
5583 DECL_SIZE (x) = bitsize_int (width);
5584 DECL_BIT_FIELD (x) = 1;
5585 SET_DECL_C_BIT_FIELD (x);
5588 && ! (* targetm.ms_bitfield_layout_p) (t))
5590 /* field size 0 => force desired amount of alignment. */
5591 #ifdef EMPTY_FIELD_BOUNDARY
5592 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5594 #ifdef PCC_BITFIELD_TYPE_MATTERS
5595 if (PCC_BITFIELD_TYPE_MATTERS)
5597 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5598 TYPE_ALIGN (TREE_TYPE (x)));
5599 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5606 else if (TREE_TYPE (x) != error_mark_node)
5608 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5609 : TYPE_ALIGN (TREE_TYPE (x)));
5611 /* Non-bit-fields are aligned for their type, except packed
5612 fields which require only BITS_PER_UNIT alignment. */
5613 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5614 if (! DECL_PACKED (x))
5615 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5618 DECL_INITIAL (x) = 0;
5620 /* Detect flexible array member in an invalid context. */
5621 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5622 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5623 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5624 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5626 if (TREE_CODE (t) == UNION_TYPE)
5627 error_with_decl (x, "flexible array member in union");
5628 else if (TREE_CHAIN (x) != NULL_TREE)
5629 error_with_decl (x, "flexible array member not at end of struct");
5630 else if (! saw_named_field)
5631 error_with_decl (x, "flexible array member in otherwise empty struct");
5634 saw_named_field = 1;
5637 /* Delete all duplicate fields from the fieldlist */
5638 for (x = fieldlist; x && TREE_CHAIN (x);)
5639 /* Anonymous fields aren't duplicates. */
5640 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5648 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5654 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5656 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5657 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5663 /* Now we have the nearly final fieldlist. Record it,
5664 then lay out the structure or union (including the fields). */
5666 TYPE_FIELDS (t) = fieldlist;
5670 /* Delete all zero-width bit-fields from the fieldlist */
5672 tree *fieldlistp = &fieldlist;
5674 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5675 *fieldlistp = TREE_CHAIN (*fieldlistp);
5677 fieldlistp = &TREE_CHAIN (*fieldlistp);
5680 /* Now we have the truly final field list.
5681 Store it in this type and in the variants. */
5683 TYPE_FIELDS (t) = fieldlist;
5685 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5687 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5688 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5689 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5690 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5693 /* If this was supposed to be a transparent union, but we can't
5694 make it one, warn and turn off the flag. */
5695 if (TREE_CODE (t) == UNION_TYPE
5696 && TYPE_TRANSPARENT_UNION (t)
5697 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5699 TYPE_TRANSPARENT_UNION (t) = 0;
5700 warning ("union cannot be made transparent");
5703 /* If this structure or union completes the type of any previous
5704 variable declaration, lay it out and output its rtl. */
5706 if (current_binding_level->n_incomplete != 0)
5709 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5711 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5712 && TREE_CODE (decl) != TYPE_DECL)
5714 layout_decl (decl, 0);
5715 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5716 maybe_objc_check_decl (decl);
5717 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5720 if (--current_binding_level->n_incomplete == 0)
5723 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5724 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5726 tree element = TREE_TYPE (decl);
5727 while (TREE_CODE (element) == ARRAY_TYPE)
5728 element = TREE_TYPE (element);
5731 layout_array_type (TREE_TYPE (decl));
5732 if (TREE_CODE (decl) != TYPE_DECL)
5734 layout_decl (decl, 0);
5735 maybe_objc_check_decl (decl);
5736 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5740 if (--current_binding_level->n_incomplete == 0)
5747 /* Finish debugging output for this type. */
5748 rest_of_type_compilation (t, toplevel);
5753 /* Lay out the type T, and its element type, and so on. */
5756 layout_array_type (t)
5759 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5760 layout_array_type (TREE_TYPE (t));
5764 /* Begin compiling the definition of an enumeration type.
5765 NAME is its name (or null if anonymous).
5766 Returns the type object, as yet incomplete.
5767 Also records info about it so that build_enumerator
5768 may be used to declare the individual values as they are read. */
5776 /* If this is the real definition for a previous forward reference,
5777 fill in the contents in the same object that used to be the
5778 forward reference. */
5781 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5783 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5785 enumtype = make_node (ENUMERAL_TYPE);
5786 pushtag (name, enumtype);
5789 C_TYPE_BEING_DEFINED (enumtype) = 1;
5791 if (TYPE_VALUES (enumtype) != 0)
5793 /* This enum is a named one that has been declared already. */
5794 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5796 /* Completely replace its old definition.
5797 The old enumerators remain defined, however. */
5798 TYPE_VALUES (enumtype) = 0;
5801 enum_next_value = integer_zero_node;
5804 if (flag_short_enums)
5805 TYPE_PACKED (enumtype) = 1;
5810 /* After processing and defining all the values of an enumeration type,
5811 install their decls in the enumeration type and finish it off.
5812 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5813 and ATTRIBUTES are the specified attributes.
5814 Returns ENUMTYPE. */
5817 finish_enum (enumtype, values, attributes)
5823 tree minnode = 0, maxnode = 0, enum_value_type;
5824 int precision, unsign;
5825 int toplevel = (global_binding_level == current_binding_level);
5827 if (in_parm_level_p ())
5828 warning ("enum defined inside parms");
5830 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5832 /* Calculate the maximum value of any enumerator in this type. */
5834 if (values == error_mark_node)
5835 minnode = maxnode = integer_zero_node;
5838 minnode = maxnode = TREE_VALUE (values);
5839 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5841 tree value = TREE_VALUE (pair);
5842 if (tree_int_cst_lt (maxnode, value))
5844 if (tree_int_cst_lt (value, minnode))
5849 /* Construct the final type of this enumeration. It is the same
5850 as one of the integral types - the narrowest one that fits, except
5851 that normally we only go as narrow as int - and signed iff any of
5852 the values are negative. */
5853 unsign = (tree_int_cst_sgn (minnode) >= 0);
5854 precision = MAX (min_precision (minnode, unsign),
5855 min_precision (maxnode, unsign));
5856 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5858 tree narrowest = type_for_size (precision, unsign);
5861 warning ("enumeration values exceed range of largest integer");
5862 narrowest = long_long_integer_type_node;
5865 precision = TYPE_PRECISION (narrowest);
5868 precision = TYPE_PRECISION (integer_type_node);
5870 if (precision == TYPE_PRECISION (integer_type_node))
5871 enum_value_type = type_for_size (precision, 0);
5873 enum_value_type = enumtype;
5875 TYPE_MIN_VALUE (enumtype) = minnode;
5876 TYPE_MAX_VALUE (enumtype) = maxnode;
5877 TYPE_PRECISION (enumtype) = precision;
5878 TREE_UNSIGNED (enumtype) = unsign;
5879 TYPE_SIZE (enumtype) = 0;
5880 layout_type (enumtype);
5882 if (values != error_mark_node)
5884 /* Change the type of the enumerators to be the enum type. We
5885 need to do this irrespective of the size of the enum, for
5886 proper type checking. Replace the DECL_INITIALs of the
5887 enumerators, and the value slots of the list, with copies
5888 that have the enum type; they cannot be modified in place
5889 because they may be shared (e.g. integer_zero_node) Finally,
5890 change the purpose slots to point to the names of the decls. */
5891 for (pair = values; pair; pair = TREE_CHAIN (pair))
5893 tree enu = TREE_PURPOSE (pair);
5895 TREE_TYPE (enu) = enumtype;
5896 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5897 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5898 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5899 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5900 DECL_MODE (enu) = TYPE_MODE (enumtype);
5902 /* The ISO C Standard mandates enumerators to have type int,
5903 even though the underlying type of an enum type is
5904 unspecified. Here we convert any enumerators that fit in
5905 an int to type int, to avoid promotions to unsigned types
5906 when comparing integers with enumerators that fit in the
5907 int range. When -pedantic is given, build_enumerator()
5908 would have already taken care of those that don't fit. */
5909 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5910 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5912 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5914 TREE_PURPOSE (pair) = DECL_NAME (enu);
5915 TREE_VALUE (pair) = DECL_INITIAL (enu);
5918 TYPE_VALUES (enumtype) = values;
5921 /* Fix up all variant types of this enum type. */
5922 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5924 if (tem == enumtype)
5926 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5927 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5928 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5929 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5930 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5931 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5932 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5933 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5934 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5935 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5938 /* Finish debugging output for this type. */
5939 rest_of_type_compilation (enumtype, toplevel);
5944 /* Build and install a CONST_DECL for one value of the
5945 current enumeration type (one that was begun with start_enum).
5946 Return a tree-list containing the CONST_DECL and its value.
5947 Assignment of sequential values by default is handled here. */
5950 build_enumerator (name, value)
5955 /* Validate and default VALUE. */
5957 /* Remove no-op casts from the value. */
5959 STRIP_TYPE_NOPS (value);
5963 if (TREE_CODE (value) == INTEGER_CST)
5965 value = default_conversion (value);
5966 constant_expression_warning (value);
5970 error ("enumerator value for `%s' not integer constant",
5971 IDENTIFIER_POINTER (name));
5976 /* Default based on previous value. */
5977 /* It should no longer be possible to have NON_LVALUE_EXPR
5981 value = enum_next_value;
5983 error ("overflow in enumeration values");
5986 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5988 pedwarn ("ISO C restricts enumerator values to range of `int'");
5989 value = convert (integer_type_node, value);
5992 /* Set basis for default for next value. */
5993 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5994 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5996 /* Now create a declaration for the enum value name. */
5998 type = TREE_TYPE (value);
5999 type = type_for_size (MAX (TYPE_PRECISION (type),
6000 TYPE_PRECISION (integer_type_node)),
6001 (TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node)
6002 && TREE_UNSIGNED (type)));
6004 decl = build_decl (CONST_DECL, name, type);
6005 DECL_INITIAL (decl) = convert (type, value);
6008 return tree_cons (decl, value, NULL_TREE);
6012 /* Create the FUNCTION_DECL for a function definition.
6013 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6014 the declaration; they describe the function's name and the type it returns,
6015 but twisted together in a fashion that parallels the syntax of C.
6017 This function creates a binding context for the function body
6018 as well as setting up the FUNCTION_DECL in current_function_decl.
6020 Returns 1 on success. If the DECLARATOR is not suitable for a function
6021 (it defines a datum instead), we return 0, which tells
6022 yyparse to report a parse error. */
6025 start_function (declspecs, declarator, attributes)
6026 tree declarator, declspecs, attributes;
6028 tree decl1, old_decl;
6030 int old_immediate_size_expand = immediate_size_expand;
6032 current_function_returns_value = 0; /* Assume, until we see it does. */
6033 current_function_returns_null = 0;
6034 current_function_returns_abnormally = 0;
6035 warn_about_return_type = 0;
6036 current_extern_inline = 0;
6037 c_function_varargs = 0;
6039 shadowed_labels = 0;
6041 /* Don't expand any sizes in the return type of the function. */
6042 immediate_size_expand = 0;
6044 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6046 /* If the declarator is not suitable for a function definition,
6047 cause a syntax error. */
6050 immediate_size_expand = old_immediate_size_expand;
6054 decl_attributes (&decl1, attributes, 0);
6056 /* If #pragma weak was used, mark the decl weak now. */
6057 if (current_binding_level == global_binding_level)
6058 maybe_apply_pragma_weak (decl1);
6060 if (DECL_DECLARED_INLINE_P (decl1)
6061 && DECL_UNINLINABLE (decl1)
6062 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6063 warning_with_decl (decl1,
6064 "inline function `%s' given attribute noinline");
6066 announce_function (decl1);
6068 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6070 error ("return type is an incomplete type");
6071 /* Make it return void instead. */
6073 = build_function_type (void_type_node,
6074 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6077 if (warn_about_return_type)
6078 pedwarn_c99 ("return type defaults to `int'");
6080 /* Save the parm names or decls from this function's declarator
6081 where store_parm_decls will find them. */
6082 current_function_parms = last_function_parms;
6083 current_function_parm_tags = last_function_parm_tags;
6085 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6086 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6087 DECL_INITIAL (decl1) = error_mark_node;
6089 /* If this definition isn't a prototype and we had a prototype declaration
6090 before, copy the arg type info from that prototype.
6091 But not if what we had before was a builtin function. */
6092 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6093 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6094 && !DECL_BUILT_IN (old_decl)
6095 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6096 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6097 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6099 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6100 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6101 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6104 /* If there is no explicit declaration, look for any out-of-scope implicit
6107 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6109 /* Optionally warn of old-fashioned def with no previous prototype. */
6110 if (warn_strict_prototypes
6111 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6113 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6114 || (DECL_BUILT_IN (old_decl)
6115 && ! C_DECL_ANTICIPATED (old_decl)))))
6116 warning ("function declaration isn't a prototype");
6117 /* Optionally warn of any global def with no previous prototype. */
6118 else if (warn_missing_prototypes
6119 && TREE_PUBLIC (decl1)
6121 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6122 || (DECL_BUILT_IN (old_decl)
6123 && ! C_DECL_ANTICIPATED (old_decl))))
6124 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6125 warning_with_decl (decl1, "no previous prototype for `%s'");
6126 /* Optionally warn of any def with no previous prototype
6127 if the function has already been used. */
6128 else if (warn_missing_prototypes
6129 && old_decl != 0 && TREE_USED (old_decl)
6130 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6131 warning_with_decl (decl1,
6132 "`%s' was used with no prototype before its definition");
6133 /* Optionally warn of any global def with no previous declaration. */
6134 else if (warn_missing_declarations
6135 && TREE_PUBLIC (decl1)
6137 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6138 warning_with_decl (decl1, "no previous declaration for `%s'");
6139 /* Optionally warn of any def with no previous declaration
6140 if the function has already been used. */
6141 else if (warn_missing_declarations
6142 && old_decl != 0 && TREE_USED (old_decl)
6143 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6144 warning_with_decl (decl1,
6145 "`%s' was used with no declaration before its definition");
6147 /* This is a definition, not a reference.
6148 So normally clear DECL_EXTERNAL.
6149 However, `extern inline' acts like a declaration
6150 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6151 DECL_EXTERNAL (decl1) = current_extern_inline;
6153 /* This function exists in static storage.
6154 (This does not mean `static' in the C sense!) */
6155 TREE_STATIC (decl1) = 1;
6157 /* A nested function is not global. */
6158 if (current_function_decl != 0)
6159 TREE_PUBLIC (decl1) = 0;
6161 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6162 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6167 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6168 != integer_type_node)
6169 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6171 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6172 args = TREE_CHAIN (args))
6174 tree type = args ? TREE_VALUE (args) : 0;
6176 if (type == void_type_node)
6183 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6184 pedwarn_with_decl (decl1,
6185 "first argument of `%s' should be `int'");
6189 if (TREE_CODE (type) != POINTER_TYPE
6190 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6191 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6193 pedwarn_with_decl (decl1,
6194 "second argument of `%s' should be `char **'");
6198 if (TREE_CODE (type) != POINTER_TYPE
6199 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6200 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6202 pedwarn_with_decl (decl1,
6203 "third argument of `%s' should probably be `char **'");
6208 /* It is intentional that this message does not mention the third
6209 argument because it's only mentioned in an appendix of the
6211 if (argct > 0 && (argct < 2 || argct > 3))
6212 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6214 if (! TREE_PUBLIC (decl1))
6215 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6218 /* Record the decl so that the function name is defined.
6219 If we already have a decl for this name, and it is a FUNCTION_DECL,
6220 use the old decl. */
6222 current_function_decl = pushdecl (decl1);
6225 declare_parm_level (1);
6226 current_binding_level->subblocks_tag_transparent = 1;
6228 make_decl_rtl (current_function_decl, NULL);
6230 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6231 /* Promote the value to int before returning it. */
6232 if (c_promoting_integer_type_p (restype))
6234 /* It retains unsignedness if not really getting wider. */
6235 if (TREE_UNSIGNED (restype)
6236 && (TYPE_PRECISION (restype)
6237 == TYPE_PRECISION (integer_type_node)))
6238 restype = unsigned_type_node;
6240 restype = integer_type_node;
6242 DECL_RESULT (current_function_decl)
6243 = build_decl (RESULT_DECL, NULL_TREE, restype);
6245 /* If this fcn was already referenced via a block-scope `extern' decl
6246 (or an implicit decl), propagate certain information about the usage. */
6247 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6248 TREE_ADDRESSABLE (current_function_decl) = 1;
6250 immediate_size_expand = old_immediate_size_expand;
6252 start_fname_decls ();
6257 /* Record that this function is going to be a varargs function.
6258 This is called before store_parm_decls, which is too early
6259 to call mark_varargs directly. */
6264 c_function_varargs = 1;
6267 /* Store the parameter declarations into the current function declaration.
6268 This is called after parsing the parameter declarations, before
6269 digesting the body of the function.
6271 For an old-style definition, modify the function's type
6272 to specify at least the number of arguments. */
6277 tree fndecl = current_function_decl;
6280 /* This is either a chain of PARM_DECLs (if a prototype was used)
6281 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6282 tree specparms = current_function_parms;
6284 /* This is a list of types declared among parms in a prototype. */
6285 tree parmtags = current_function_parm_tags;
6287 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6288 tree parmdecls = getdecls ();
6290 /* This is a chain of any other decls that came in among the parm
6291 declarations. If a parm is declared with enum {foo, bar} x;
6292 then CONST_DECLs for foo and bar are put here. */
6295 /* The function containing FNDECL, if any. */
6296 tree context = decl_function_context (fndecl);
6298 /* Nonzero if this definition is written with a prototype. */
6301 int saved_warn_shadow = warn_shadow;
6303 /* Don't re-emit shadow warnings. */
6306 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6308 /* This case is when the function was defined with an ANSI prototype.
6309 The parms already have decls, so we need not do anything here
6310 except record them as in effect
6311 and complain if any redundant old-style parm decls were written. */
6322 error_with_decl (fndecl,
6323 "parm types given both in parmlist and separately");
6324 /* Get rid of the erroneous decls; don't keep them on
6325 the list of parms, since they might not be PARM_DECLs. */
6326 for (decl = current_binding_level->names;
6327 decl; decl = TREE_CHAIN (decl))
6328 if (DECL_NAME (decl))
6329 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6330 for (link = current_binding_level->shadowed;
6331 link; link = TREE_CHAIN (link))
6332 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6333 current_binding_level->names = 0;
6334 current_binding_level->shadowed = 0;
6337 specparms = nreverse (specparms);
6338 for (parm = specparms; parm; parm = next)
6340 next = TREE_CHAIN (parm);
6341 if (TREE_CODE (parm) == PARM_DECL)
6343 if (DECL_NAME (parm) == 0)
6344 error_with_decl (parm, "parameter name omitted");
6345 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6346 && VOID_TYPE_P (TREE_TYPE (parm)))
6348 error_with_decl (parm, "parameter `%s' declared void");
6349 /* Change the type to error_mark_node so this parameter
6350 will be ignored by assign_parms. */
6351 TREE_TYPE (parm) = error_mark_node;
6357 /* If we find an enum constant or a type tag,
6358 put it aside for the moment. */
6359 TREE_CHAIN (parm) = 0;
6360 others = chainon (others, parm);
6364 /* Get the decls in their original chain order
6365 and record in the function. */
6366 DECL_ARGUMENTS (fndecl) = getdecls ();
6369 /* If this function takes a variable number of arguments,
6370 add a phony parameter to the end of the parm list,
6371 to represent the position of the first unnamed argument. */
6372 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6375 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6376 /* Let's hope the address of the unnamed parm
6377 won't depend on its type. */
6378 TREE_TYPE (dummy) = integer_type_node;
6379 DECL_ARG_TYPE (dummy) = integer_type_node;
6380 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6384 /* Now pushdecl the enum constants. */
6385 for (parm = others; parm; parm = next)
6387 next = TREE_CHAIN (parm);
6388 if (DECL_NAME (parm) == 0)
6390 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6392 else if (TREE_CODE (parm) != PARM_DECL)
6396 storetags (chainon (parmtags, gettags ()));
6400 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6401 each with a parm name as the TREE_VALUE.
6403 PARMDECLS is a chain of declarations for parameters.
6404 Warning! It can also contain CONST_DECLs which are not parameters
6405 but are names of enumerators of any enum types
6406 declared among the parameters.
6408 First match each formal parameter name with its declaration.
6409 Associate decls with the names and store the decls
6410 into the TREE_PURPOSE slots. */
6412 /* We use DECL_WEAK as a flag to show which parameters have been
6413 seen already since it is not used on PARM_DECL or CONST_DECL. */
6414 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6415 DECL_WEAK (parm) = 0;
6417 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6419 tree tail, found = NULL;
6421 if (TREE_VALUE (parm) == 0)
6423 error_with_decl (fndecl,
6424 "parameter name missing from parameter list");
6425 TREE_PURPOSE (parm) = 0;
6429 /* See if any of the parmdecls specifies this parm by name.
6430 Ignore any enumerator decls. */
6431 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6432 if (DECL_NAME (tail) == TREE_VALUE (parm)
6433 && TREE_CODE (tail) == PARM_DECL)
6439 /* If declaration already marked, we have a duplicate name.
6440 Complain, and don't use this decl twice. */
6441 if (found && DECL_WEAK (found))
6443 error_with_decl (found, "multiple parameters named `%s'");
6447 /* If the declaration says "void", complain and ignore it. */
6448 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6450 error_with_decl (found, "parameter `%s' declared void");
6451 TREE_TYPE (found) = integer_type_node;
6452 DECL_ARG_TYPE (found) = integer_type_node;
6453 layout_decl (found, 0);
6456 /* If no declaration found, default to int. */
6459 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6461 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6462 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6463 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6465 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6466 else if (extra_warnings)
6467 warning_with_decl (found, "type of `%s' defaults to `int'");
6471 TREE_PURPOSE (parm) = found;
6473 /* Mark this decl as "already found". */
6474 DECL_WEAK (found) = 1;
6477 /* Put anything which is on the parmdecls chain and which is
6478 not a PARM_DECL onto the list NONPARMS. (The types of
6479 non-parm things which might appear on the list include
6480 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6481 any actual PARM_DECLs not matched with any names. */
6484 for (parm = parmdecls; parm;)
6486 tree next = TREE_CHAIN (parm);
6487 TREE_CHAIN (parm) = 0;
6489 if (TREE_CODE (parm) != PARM_DECL)
6490 nonparms = chainon (nonparms, parm);
6493 /* Complain about args with incomplete types. */
6494 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6496 error_with_decl (parm, "parameter `%s' has incomplete type");
6497 TREE_TYPE (parm) = error_mark_node;
6500 if (! DECL_WEAK (parm))
6502 error_with_decl (parm,
6503 "declaration for parameter `%s' but no such parameter");
6504 /* Pretend the parameter was not missing.
6505 This gets us to a standard state and minimizes
6506 further error messages. */
6508 = chainon (specparms,
6509 tree_cons (parm, NULL_TREE, NULL_TREE));
6516 /* Chain the declarations together in the order of the list of
6517 names. Store that chain in the function decl, replacing the
6520 DECL_ARGUMENTS (fndecl) = 0;
6523 for (last = 0; parm; parm = TREE_CHAIN (parm))
6524 if (TREE_PURPOSE (parm))
6527 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6529 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6530 last = TREE_PURPOSE (parm);
6531 TREE_CHAIN (last) = 0;
6535 /* If there was a previous prototype,
6536 set the DECL_ARG_TYPE of each argument according to
6537 the type previously specified, and report any mismatches. */
6539 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6542 for (parm = DECL_ARGUMENTS (fndecl),
6543 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6544 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6545 != void_type_node));
6546 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6548 if (parm == 0 || type == 0
6549 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6551 error ("number of arguments doesn't match prototype");
6552 error_with_file_and_line (current_function_prototype_file,
6553 current_function_prototype_line,
6554 "prototype declaration");
6557 /* Type for passing arg must be consistent with that
6558 declared for the arg. ISO C says we take the unqualified
6559 type for parameters declared with qualified type. */
6560 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6561 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6563 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6564 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6566 /* Adjust argument to match prototype. E.g. a previous
6567 `int foo(float);' prototype causes
6568 `int foo(x) float x; {...}' to be treated like
6569 `int foo(float x) {...}'. This is particularly
6570 useful for argument types like uid_t. */
6571 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6573 if (PROMOTE_PROTOTYPES
6574 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6575 && TYPE_PRECISION (TREE_TYPE (parm))
6576 < TYPE_PRECISION (integer_type_node))
6577 DECL_ARG_TYPE (parm) = integer_type_node;
6581 pedwarn ("promoted argument `%s' doesn't match prototype",
6582 IDENTIFIER_POINTER (DECL_NAME (parm)));
6583 warning_with_file_and_line
6584 (current_function_prototype_file,
6585 current_function_prototype_line,
6586 "prototype declaration");
6591 error ("argument `%s' doesn't match prototype",
6592 IDENTIFIER_POINTER (DECL_NAME (parm)));
6593 error_with_file_and_line (current_function_prototype_file,
6594 current_function_prototype_line,
6595 "prototype declaration");
6599 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6602 /* Otherwise, create a prototype that would match. */
6606 tree actual = 0, last = 0, type;
6608 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6610 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6612 TREE_CHAIN (last) = type;
6617 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6619 TREE_CHAIN (last) = type;
6623 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6624 of the type of this function, but we need to avoid having this
6625 affect the types of other similarly-typed functions, so we must
6626 first force the generation of an identical (but separate) type
6627 node for the relevant function type. The new node we create
6628 will be a variant of the main variant of the original function
6631 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6633 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6636 /* Now store the final chain of decls for the arguments
6637 as the decl-chain of the current lexical scope.
6638 Put the enumerators in as well, at the front so that
6639 DECL_ARGUMENTS is not modified. */
6641 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6644 /* Make sure the binding level for the top of the function body
6645 gets a BLOCK if there are any in the function.
6646 Otherwise, the dbx output is wrong. */
6648 keep_next_if_subblocks = 1;
6650 /* ??? This might be an improvement,
6651 but needs to be thought about some more. */
6653 keep_next_level_flag = 1;
6656 /* Write a record describing this function definition to the prototypes
6657 file (if requested). */
6659 gen_aux_info_record (fndecl, 1, 0, prototype);
6661 /* Initialize the RTL code for the function. */
6662 init_function_start (fndecl, input_filename, lineno);
6664 /* Begin the statement tree for this function. */
6665 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6667 /* If this is a nested function, save away the sizes of any
6668 variable-size types so that we can expand them when generating
6674 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6675 = nreverse (get_pending_sizes ());
6676 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6679 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6682 /* This function is being processed in whole-function mode. */
6683 cfun->x_whole_function_mode_p = 1;
6685 /* Even though we're inside a function body, we still don't want to
6686 call expand_expr to calculate the size of a variable-sized array.
6687 We haven't necessarily assigned RTL to all variables yet, so it's
6688 not safe to try to expand expressions involving them. */
6689 immediate_size_expand = 0;
6690 cfun->x_dont_save_pending_sizes_p = 1;
6692 warn_shadow = saved_warn_shadow;
6695 /* Finish up a function declaration and compile that function
6696 all the way to assembler language output. The free the storage
6697 for the function definition.
6699 This is called after parsing the body of the function definition.
6701 NESTED is nonzero if the function being finished is nested in another. */
6704 finish_function (nested)
6707 tree fndecl = current_function_decl;
6710 /* This caused &foo to be of type ptr-to-const-function which then
6711 got a warning when stored in a ptr-to-function variable. */
6712 TREE_READONLY (fndecl) = 1;
6716 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6718 /* Must mark the RESULT_DECL as being in this function. */
6720 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6722 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
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;
6739 c_expand_return (integer_zero_node);
6744 finish_fname_decls ();
6746 /* Tie off the statement tree for this function. */
6747 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6749 /* Complain if there's just no return statement. */
6750 if (warn_return_type
6751 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6752 && !current_function_returns_value && !current_function_returns_null
6753 /* Don't complain if we abort. */
6754 && !current_function_returns_abnormally
6755 /* Don't warn for main(). */
6756 && !MAIN_NAME_P (DECL_NAME (fndecl))
6757 /* Or if they didn't actually specify a return type. */
6758 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6759 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6760 inline function, as we might never be compiled separately. */
6761 && DECL_INLINE (fndecl))
6762 warning ("no return statement in function returning non-void");
6764 /* Clear out memory we no longer need. */
6765 free_after_parsing (cfun);
6766 /* Since we never call rest_of_compilation, we never clear
6767 CFUN. Do so explicitly. */
6768 free_after_compilation (cfun);
6773 /* Generate RTL for the body of this function. */
6774 c_expand_body (fndecl, nested, 1);
6776 /* Let the error reporting routines know that we're outside a
6777 function. For a nested function, this value is used in
6778 pop_c_function_context and then reset via pop_function_context. */
6779 current_function_decl = NULL;
6783 /* Generate the RTL for a deferred function FNDECL. */
6786 c_expand_deferred_function (fndecl)
6789 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6790 function was deferred, e.g. in duplicate_decls. */
6791 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6793 c_expand_body (fndecl, 0, 0);
6794 current_function_decl = NULL;
6798 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6799 then we are already in the process of generating RTL for another
6800 function. If can_defer_p is zero, we won't attempt to defer the
6801 generation of RTL. */
6804 c_expand_body (fndecl, nested_p, can_defer_p)
6806 int nested_p, can_defer_p;
6808 int uninlinable = 1;
6810 /* There's no reason to do any of the work here if we're only doing
6811 semantic analysis; this code just generates RTL. */
6812 if (flag_syntax_only)
6815 if (flag_inline_trees)
6817 /* First, cache whether the current function is inlinable. Some
6818 predicates depend on cfun and current_function_decl to
6819 function completely. */
6820 timevar_push (TV_INTEGRATION);
6821 uninlinable = ! tree_inlinable_function_p (fndecl);
6823 if (! uninlinable && can_defer_p
6824 /* Save function tree for inlining. Should return 0 if the
6825 language does not support function deferring or the
6826 function could not be deferred. */
6827 && defer_fn (fndecl))
6829 /* Let the back-end know that this function exists. */
6830 (*debug_hooks->deferred_inline_function) (fndecl);
6831 timevar_pop (TV_INTEGRATION);
6835 /* Then, inline any functions called in it. */
6836 optimize_inline_calls (fndecl);
6837 timevar_pop (TV_INTEGRATION);
6840 timevar_push (TV_EXPAND);
6844 /* Make sure that we will evaluate variable-sized types involved
6845 in our function's type. */
6846 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6847 /* Squirrel away our current state. */
6848 push_function_context ();
6851 /* Initialize the RTL code for the function. */
6852 current_function_decl = fndecl;
6853 input_filename = DECL_SOURCE_FILE (fndecl);
6854 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6856 /* This function is being processed in whole-function mode. */
6857 cfun->x_whole_function_mode_p = 1;
6859 /* Even though we're inside a function body, we still don't want to
6860 call expand_expr to calculate the size of a variable-sized array.
6861 We haven't necessarily assigned RTL to all variables yet, so it's
6862 not safe to try to expand expressions involving them. */
6863 immediate_size_expand = 0;
6864 cfun->x_dont_save_pending_sizes_p = 1;
6866 /* If this is a varargs function, inform function.c. */
6867 if (c_function_varargs)
6870 /* Set up parameters and prepare for return, for the function. */
6871 expand_function_start (fndecl, 0);
6873 /* If this function is `main', emit a call to `__main'
6874 to run global initializers, etc. */
6875 if (DECL_NAME (fndecl)
6876 && MAIN_NAME_P (DECL_NAME (fndecl))
6877 && DECL_CONTEXT (fndecl) == NULL_TREE)
6878 expand_main_function ();
6880 /* Generate the RTL for this function. */
6881 expand_stmt (DECL_SAVED_TREE (fndecl));
6884 /* Allow the body of the function to be garbage collected. */
6885 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6888 /* We hard-wired immediate_size_expand to zero above.
6889 expand_function_end will decrement this variable. So, we set the
6890 variable to one here, so that after the decrement it will remain
6892 immediate_size_expand = 1;
6894 /* Allow language dialects to perform special processing. */
6895 if (lang_expand_function_end)
6896 (*lang_expand_function_end) ();
6898 /* Generate rtl for function exit. */
6899 expand_function_end (input_filename, lineno, 0);
6901 /* If this is a nested function, protect the local variables in the stack
6902 above us from being collected while we're compiling this function. */
6904 ggc_push_context ();
6906 /* Run the optimizers and output the assembler code for this function. */
6907 rest_of_compilation (fndecl);
6909 /* Undo the GC context switch. */
6913 /* With just -W, complain only if function returns both with
6914 and without a value. */
6916 && current_function_returns_value
6917 && current_function_returns_null)
6918 warning ("this function may return with or without a value");
6920 /* If requested, warn about function definitions where the function will
6921 return a value (usually of some struct or union type) which itself will
6922 take up a lot of stack space. */
6924 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6926 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6928 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6929 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6930 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6933 unsigned int size_as_int
6934 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6936 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6937 warning_with_decl (fndecl,
6938 "size of return value of `%s' is %u bytes",
6941 warning_with_decl (fndecl,
6942 "size of return value of `%s' is larger than %d bytes",
6947 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6948 && ! flag_inline_trees)
6950 /* Stop pointing to the local nodes about to be freed.
6951 But DECL_INITIAL must remain nonzero so we know this
6952 was an actual function definition.
6953 For a nested function, this is done in pop_c_function_context.
6954 If rest_of_compilation set this to 0, leave it 0. */
6955 if (DECL_INITIAL (fndecl) != 0)
6956 DECL_INITIAL (fndecl) = error_mark_node;
6958 DECL_ARGUMENTS (fndecl) = 0;
6961 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6963 if (targetm.have_ctors_dtors)
6964 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6965 DEFAULT_INIT_PRIORITY);
6967 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6970 if (DECL_STATIC_DESTRUCTOR (fndecl))
6972 if (targetm.have_ctors_dtors)
6973 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6974 DEFAULT_INIT_PRIORITY);
6976 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6980 /* Return to the enclosing function. */
6981 pop_function_context ();
6982 timevar_pop (TV_EXPAND);
6985 /* Check the declarations given in a for-loop for satisfying the C99
6988 check_for_loop_decls ()
6994 /* If we get here, declarations have been used in a for loop without
6995 the C99 for loop scope. This doesn't make much sense, so don't
6997 error ("`for' loop initial declaration used outside C99 mode");
7000 /* C99 subclause 6.8.5 paragraph 3:
7002 [#3] The declaration part of a for statement shall only
7003 declare identifiers for objects having storage class auto or
7006 It isn't clear whether, in this sentence, "identifiers" binds to
7007 "shall only declare" or to "objects" - that is, whether all identifiers
7008 declared must be identifiers for objects, or whether the restriction
7009 only applies to those that are. (A question on this in comp.std.c
7010 in November 2000 received no answer.) We implement the strictest
7011 interpretation, to avoid creating an extension which later causes
7014 for (t = gettags (); t; t = TREE_CHAIN (t))
7016 if (TREE_PURPOSE (t) != 0)
7018 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7020 if (code == RECORD_TYPE)
7021 error ("`struct %s' declared in `for' loop initial declaration",
7022 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7023 else if (code == UNION_TYPE)
7024 error ("`union %s' declared in `for' loop initial declaration",
7025 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7027 error ("`enum %s' declared in `for' loop initial declaration",
7028 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7032 for (t = getdecls (); t; t = TREE_CHAIN (t))
7034 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7035 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7036 else if (TREE_STATIC (t))
7037 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7038 else if (DECL_EXTERNAL (t))
7039 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7043 /* Save and restore the variables in this file and elsewhere
7044 that keep track of the progress of compilation of the current function.
7045 Used for nested functions. */
7047 struct c_language_function
7049 struct language_function base;
7051 tree shadowed_labels;
7054 int returns_abnormally;
7055 int warn_about_return_type;
7057 struct binding_level *binding_level;
7060 /* Save and reinitialize the variables
7061 used during compilation of a C function. */
7064 push_c_function_context (f)
7067 struct c_language_function *p;
7068 p = ((struct c_language_function *)
7069 xmalloc (sizeof (struct c_language_function)));
7070 f->language = (struct language_function *) p;
7072 p->base.x_stmt_tree = c_stmt_tree;
7073 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7074 p->named_labels = named_labels;
7075 p->shadowed_labels = shadowed_labels;
7076 p->returns_value = current_function_returns_value;
7077 p->returns_null = current_function_returns_null;
7078 p->returns_abnormally = current_function_returns_abnormally;
7079 p->warn_about_return_type = warn_about_return_type;
7080 p->extern_inline = current_extern_inline;
7081 p->binding_level = current_binding_level;
7084 /* Restore the variables used during compilation of a C function. */
7087 pop_c_function_context (f)
7090 struct c_language_function *p
7091 = (struct c_language_function *) f->language;
7094 /* Bring back all the labels that were shadowed. */
7095 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7096 if (DECL_NAME (TREE_VALUE (link)) != 0)
7097 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7098 = TREE_VALUE (link);
7100 if (DECL_SAVED_INSNS (current_function_decl) == 0
7101 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7103 /* Stop pointing to the local nodes about to be freed. */
7104 /* But DECL_INITIAL must remain nonzero so we know this
7105 was an actual function definition. */
7106 DECL_INITIAL (current_function_decl) = error_mark_node;
7107 DECL_ARGUMENTS (current_function_decl) = 0;
7110 c_stmt_tree = p->base.x_stmt_tree;
7111 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7112 named_labels = p->named_labels;
7113 shadowed_labels = p->shadowed_labels;
7114 current_function_returns_value = p->returns_value;
7115 current_function_returns_null = p->returns_null;
7116 current_function_returns_abnormally = p->returns_abnormally;
7117 warn_about_return_type = p->warn_about_return_type;
7118 current_extern_inline = p->extern_inline;
7119 current_binding_level = p->binding_level;
7125 /* Mark the language specific parts of F for GC. */
7128 mark_c_function_context (f)
7131 struct c_language_function *p
7132 = (struct c_language_function *) f->language;
7137 mark_c_language_function (&p->base);
7138 ggc_mark_tree (p->shadowed_labels);
7139 ggc_mark_tree (p->named_labels);
7140 mark_binding_level (&p->binding_level);
7143 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7146 c_dup_lang_specific_decl (decl)
7149 struct lang_decl *ld;
7151 if (!DECL_LANG_SPECIFIC (decl))
7154 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7155 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7156 sizeof (struct lang_decl));
7157 DECL_LANG_SPECIFIC (decl) = ld;
7160 /* Mark the language specific bits in T for GC. */
7166 if (TREE_CODE (t) == IDENTIFIER_NODE)
7168 struct lang_identifier *i = (struct lang_identifier *) t;
7169 ggc_mark_tree (i->global_value);
7170 ggc_mark_tree (i->local_value);
7171 ggc_mark_tree (i->label_value);
7172 ggc_mark_tree (i->implicit_decl);
7173 ggc_mark_tree (i->error_locus);
7174 ggc_mark_tree (i->limbo_value);
7176 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7177 ggc_mark (TYPE_LANG_SPECIFIC (t));
7178 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7180 ggc_mark (DECL_LANG_SPECIFIC (t));
7181 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7182 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7186 /* The functions below are required for functionality of doing
7187 function at once processing in the C front end. Currently these
7188 functions are not called from anywhere in the C front end, but as
7189 these changes continue, that will change. */
7191 /* Returns non-zero if the current statement is a full expression,
7192 i.e. temporaries created during that statement should be destroyed
7193 at the end of the statement. */
7196 stmts_are_full_exprs_p ()
7201 /* Returns the stmt_tree (if any) to which statements are currently
7202 being added. If there is no active statement-tree, NULL is
7206 current_stmt_tree ()
7208 return &c_stmt_tree;
7211 /* Returns the stack of SCOPE_STMTs for the current function. */
7214 current_scope_stmt_stack ()
7216 return &c_scope_stmt_stack;
7219 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7223 anon_aggr_type_p (node)
7224 tree node ATTRIBUTE_UNUSED;
7229 /* Dummy function in place of callback used by C++. */
7232 extract_interface_info ()
7236 /* Return a new COMPOUND_STMT, after adding it to the current
7240 c_begin_compound_stmt ()
7244 /* Create the COMPOUND_STMT. */
7245 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7250 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7254 c_expand_decl_stmt (t)
7257 tree decl = DECL_STMT_DECL (t);
7259 /* Expand nested functions. */
7260 if (TREE_CODE (decl) == FUNCTION_DECL
7261 && DECL_CONTEXT (decl) == current_function_decl
7262 && DECL_SAVED_TREE (decl))
7263 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7266 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7267 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7270 identifier_global_value (t)
7273 return IDENTIFIER_GLOBAL_VALUE (t);
7276 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7277 otherwise the name is found in ridpointers from RID_INDEX. */
7280 record_builtin_type (rid_index, name, type)
7287 id = ridpointers[(int) rid_index];
7289 id = get_identifier (name);
7290 pushdecl (build_decl (TYPE_DECL, id, type));
7293 /* Build the void_list_node (void_type_node having been created). */
7295 build_void_list_node ()
7297 tree t = build_tree_list (NULL_TREE, void_type_node);